10a708f8fSGustavo F. Padovan /* 20a708f8fSGustavo F. Padovan BlueZ - Bluetooth protocol stack for Linux 30a708f8fSGustavo F. Padovan Copyright (C) 2000-2001 Qualcomm Incorporated 40a708f8fSGustavo F. Padovan Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> 50a708f8fSGustavo F. Padovan Copyright (C) 2010 Google Inc. 6590051deSGustavo F. Padovan Copyright (C) 2011 ProFUSION Embedded Systems 7422e925bSMat Martineau Copyright (c) 2012 Code Aurora Forum. All rights reserved. 80a708f8fSGustavo F. Padovan 90a708f8fSGustavo F. Padovan Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 100a708f8fSGustavo F. Padovan 110a708f8fSGustavo F. Padovan This program is free software; you can redistribute it and/or modify 120a708f8fSGustavo F. Padovan it under the terms of the GNU General Public License version 2 as 130a708f8fSGustavo F. Padovan published by the Free Software Foundation; 140a708f8fSGustavo F. Padovan 150a708f8fSGustavo F. Padovan THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 160a708f8fSGustavo F. Padovan OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 170a708f8fSGustavo F. Padovan FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 180a708f8fSGustavo F. Padovan IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 190a708f8fSGustavo F. Padovan CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 200a708f8fSGustavo F. Padovan WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 210a708f8fSGustavo F. Padovan ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 220a708f8fSGustavo F. Padovan OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 230a708f8fSGustavo F. Padovan 240a708f8fSGustavo F. Padovan ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 250a708f8fSGustavo F. Padovan COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 260a708f8fSGustavo F. Padovan SOFTWARE IS DISCLAIMED. 270a708f8fSGustavo F. Padovan */ 280a708f8fSGustavo F. Padovan 29bb58f747SGustavo F. Padovan /* Bluetooth L2CAP core. */ 300a708f8fSGustavo F. Padovan 310a708f8fSGustavo F. Padovan #include <linux/module.h> 320a708f8fSGustavo F. Padovan 330a708f8fSGustavo F. Padovan #include <linux/debugfs.h> 340a708f8fSGustavo F. Padovan #include <linux/crc16.h> 350a708f8fSGustavo F. Padovan 360a708f8fSGustavo F. Padovan #include <net/bluetooth/bluetooth.h> 370a708f8fSGustavo F. Padovan #include <net/bluetooth/hci_core.h> 380a708f8fSGustavo F. Padovan #include <net/bluetooth/l2cap.h> 397ef9fbf0SMarcel Holtmann 40ac4b7236SMarcel Holtmann #include "smp.h" 417024728eSMarcel Holtmann #include "a2mp.h" 427ef9fbf0SMarcel Holtmann #include "amp.h" 430a708f8fSGustavo F. Padovan 440f1bfe4eSJohan Hedberg #define LE_FLOWCTL_MAX_CREDITS 65535 450f1bfe4eSJohan Hedberg 46d1de6d46SMat Martineau bool disable_ertm; 470a708f8fSGustavo F. Padovan 48547d1032SMarcel Holtmann static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; 490a708f8fSGustavo F. Padovan 50b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 51b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 520a708f8fSGustavo F. Padovan 53f15b8ecfSJohan Hedberg static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; 54f15b8ecfSJohan Hedberg static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; 55f15b8ecfSJohan Hedberg 560a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 570a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 584519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 594519de9aSGustavo F. Padovan void *data); 60710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 615e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); 620a708f8fSGustavo F. Padovan 63d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 64608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event); 65608bcc6dSMat Martineau 66a250e048SJohan Hedberg static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type) 674f1654e0SMarcel Holtmann { 68a250e048SJohan Hedberg if (link_type == LE_LINK) { 69a250e048SJohan Hedberg if (bdaddr_type == ADDR_LE_DEV_PUBLIC) 704f1654e0SMarcel Holtmann return BDADDR_LE_PUBLIC; 714f1654e0SMarcel Holtmann else 724f1654e0SMarcel Holtmann return BDADDR_LE_RANDOM; 734f1654e0SMarcel Holtmann } 744f1654e0SMarcel Holtmann 754f1654e0SMarcel Holtmann return BDADDR_BREDR; 764f1654e0SMarcel Holtmann } 774f1654e0SMarcel Holtmann 78a250e048SJohan Hedberg static inline u8 bdaddr_src_type(struct hci_conn *hcon) 79a250e048SJohan Hedberg { 80a250e048SJohan Hedberg return bdaddr_type(hcon->type, hcon->src_type); 81a250e048SJohan Hedberg } 82a250e048SJohan Hedberg 83a250e048SJohan Hedberg static inline u8 bdaddr_dst_type(struct hci_conn *hcon) 84a250e048SJohan Hedberg { 85a250e048SJohan Hedberg return bdaddr_type(hcon->type, hcon->dst_type); 86a250e048SJohan Hedberg } 87a250e048SJohan Hedberg 880a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 8971ba0e56SGustavo F. Padovan 902d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 912d792818SGustavo Padovan u16 cid) 920a708f8fSGustavo F. Padovan { 933df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 94baa7e1faSGustavo F. Padovan 953df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 963df91ea2SAndrei Emeltchenko if (c->dcid == cid) 973df91ea2SAndrei Emeltchenko return c; 980a708f8fSGustavo F. Padovan } 993df91ea2SAndrei Emeltchenko return NULL; 100baa7e1faSGustavo F. Padovan } 1010a708f8fSGustavo F. Padovan 1022d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, 1032d792818SGustavo Padovan u16 cid) 1040a708f8fSGustavo F. Padovan { 1053df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 106baa7e1faSGustavo F. Padovan 1073df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1083df91ea2SAndrei Emeltchenko if (c->scid == cid) 1093df91ea2SAndrei Emeltchenko return c; 1100a708f8fSGustavo F. Padovan } 1113df91ea2SAndrei Emeltchenko return NULL; 112baa7e1faSGustavo F. Padovan } 1130a708f8fSGustavo F. Padovan 1140a708f8fSGustavo F. Padovan /* Find channel with given SCID. 115ef191adeSMat Martineau * Returns locked channel. */ 1162d792818SGustavo Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, 1172d792818SGustavo Padovan u16 cid) 1180a708f8fSGustavo F. Padovan { 11948454079SGustavo F. Padovan struct l2cap_chan *c; 120baa7e1faSGustavo F. Padovan 1213df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 122baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 123ef191adeSMat Martineau if (c) 124ef191adeSMat Martineau l2cap_chan_lock(c); 1253df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 1263df91ea2SAndrei Emeltchenko 12748454079SGustavo F. Padovan return c; 1280a708f8fSGustavo F. Padovan } 1290a708f8fSGustavo F. Padovan 130b1a130b7SMat Martineau /* Find channel with given DCID. 131b1a130b7SMat Martineau * Returns locked channel. 132b1a130b7SMat Martineau */ 133b1a130b7SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 134b1a130b7SMat Martineau u16 cid) 135b1a130b7SMat Martineau { 136b1a130b7SMat Martineau struct l2cap_chan *c; 137b1a130b7SMat Martineau 138b1a130b7SMat Martineau mutex_lock(&conn->chan_lock); 139b1a130b7SMat Martineau c = __l2cap_get_chan_by_dcid(conn, cid); 140b1a130b7SMat Martineau if (c) 141b1a130b7SMat Martineau l2cap_chan_lock(c); 142b1a130b7SMat Martineau mutex_unlock(&conn->chan_lock); 143b1a130b7SMat Martineau 144b1a130b7SMat Martineau return c; 145b1a130b7SMat Martineau } 146b1a130b7SMat Martineau 1472d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1482d792818SGustavo Padovan u8 ident) 1490a708f8fSGustavo F. Padovan { 1503df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 151baa7e1faSGustavo F. Padovan 1523df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1533df91ea2SAndrei Emeltchenko if (c->ident == ident) 1543df91ea2SAndrei Emeltchenko return c; 1550a708f8fSGustavo F. Padovan } 1563df91ea2SAndrei Emeltchenko return NULL; 157baa7e1faSGustavo F. Padovan } 1580a708f8fSGustavo F. Padovan 1595b155ef9SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1605b155ef9SMat Martineau u8 ident) 1615b155ef9SMat Martineau { 1625b155ef9SMat Martineau struct l2cap_chan *c; 1635b155ef9SMat Martineau 1645b155ef9SMat Martineau mutex_lock(&conn->chan_lock); 1655b155ef9SMat Martineau c = __l2cap_get_chan_by_ident(conn, ident); 1665b155ef9SMat Martineau if (c) 1675b155ef9SMat Martineau l2cap_chan_lock(c); 1685b155ef9SMat Martineau mutex_unlock(&conn->chan_lock); 1695b155ef9SMat Martineau 1705b155ef9SMat Martineau return c; 1715b155ef9SMat Martineau } 1725b155ef9SMat Martineau 17323691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1749e4425ffSGustavo F. Padovan { 17523691d75SGustavo F. Padovan struct l2cap_chan *c; 1769e4425ffSGustavo F. Padovan 17723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 1787eafc59eSMarcel Holtmann if (c->sport == psm && !bacmp(&c->src, src)) 17923691d75SGustavo F. Padovan return c; 1809e4425ffSGustavo F. Padovan } 181250938cbSSzymon Janc return NULL; 182250938cbSSzymon Janc } 1839e4425ffSGustavo F. Padovan 1849e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1859e4425ffSGustavo F. Padovan { 18673b2ec18SGustavo F. Padovan int err; 18773b2ec18SGustavo F. Padovan 188333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1899e4425ffSGustavo F. Padovan 19023691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 19173b2ec18SGustavo F. Padovan err = -EADDRINUSE; 19273b2ec18SGustavo F. Padovan goto done; 1939e4425ffSGustavo F. Padovan } 1949e4425ffSGustavo F. Padovan 19573b2ec18SGustavo F. Padovan if (psm) { 1969e4425ffSGustavo F. Padovan chan->psm = psm; 1979e4425ffSGustavo F. Padovan chan->sport = psm; 19873b2ec18SGustavo F. Padovan err = 0; 19973b2ec18SGustavo F. Padovan } else { 20092594a51SJohan Hedberg u16 p, start, end, incr; 20192594a51SJohan Hedberg 20292594a51SJohan Hedberg if (chan->src_type == BDADDR_BREDR) { 20392594a51SJohan Hedberg start = L2CAP_PSM_DYN_START; 20492594a51SJohan Hedberg end = L2CAP_PSM_AUTO_END; 20592594a51SJohan Hedberg incr = 2; 20692594a51SJohan Hedberg } else { 20792594a51SJohan Hedberg start = L2CAP_PSM_LE_DYN_START; 20892594a51SJohan Hedberg end = L2CAP_PSM_LE_DYN_END; 20992594a51SJohan Hedberg incr = 1; 21092594a51SJohan Hedberg } 2119e4425ffSGustavo F. Padovan 21273b2ec18SGustavo F. Padovan err = -EINVAL; 21392594a51SJohan Hedberg for (p = start; p <= end; p += incr) 21423691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 21573b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 21673b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 21773b2ec18SGustavo F. Padovan err = 0; 21873b2ec18SGustavo F. Padovan break; 21973b2ec18SGustavo F. Padovan } 22073b2ec18SGustavo F. Padovan } 22173b2ec18SGustavo F. Padovan 22273b2ec18SGustavo F. Padovan done: 223333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 22473b2ec18SGustavo F. Padovan return err; 2259e4425ffSGustavo F. Padovan } 2266b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_add_psm); 2279e4425ffSGustavo F. Padovan 2289e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 2299e4425ffSGustavo F. Padovan { 230333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 2319e4425ffSGustavo F. Padovan 23214824308SJohan Hedberg /* Override the defaults (which are for conn-oriented) */ 23314824308SJohan Hedberg chan->omtu = L2CAP_DEFAULT_MTU; 23414824308SJohan Hedberg chan->chan_type = L2CAP_CHAN_FIXED; 23514824308SJohan Hedberg 2369e4425ffSGustavo F. Padovan chan->scid = scid; 2379e4425ffSGustavo F. Padovan 238333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 2399e4425ffSGustavo F. Padovan 2409e4425ffSGustavo F. Padovan return 0; 2419e4425ffSGustavo F. Padovan } 2429e4425ffSGustavo F. Padovan 243baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2440a708f8fSGustavo F. Padovan { 245e77af755SJohan Hedberg u16 cid, dyn_end; 2460a708f8fSGustavo F. Padovan 247e77af755SJohan Hedberg if (conn->hcon->type == LE_LINK) 248e77af755SJohan Hedberg dyn_end = L2CAP_CID_LE_DYN_END; 249e77af755SJohan Hedberg else 250e77af755SJohan Hedberg dyn_end = L2CAP_CID_DYN_END; 251e77af755SJohan Hedberg 252ab0c127fSJohan Hedberg for (cid = L2CAP_CID_DYN_START; cid <= dyn_end; cid++) { 253baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2540a708f8fSGustavo F. Padovan return cid; 2550a708f8fSGustavo F. Padovan } 2560a708f8fSGustavo F. Padovan 2570a708f8fSGustavo F. Padovan return 0; 2580a708f8fSGustavo F. Padovan } 2590a708f8fSGustavo F. Padovan 260f93fa273SGustavo Padovan static void l2cap_state_change(struct l2cap_chan *chan, int state) 26189bc500eSGustavo F. Padovan { 26242d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 263badaaa00SGustavo F. Padovan state_to_string(state)); 264badaaa00SGustavo F. Padovan 26589bc500eSGustavo F. Padovan chan->state = state; 26653f52121SGustavo Padovan chan->ops->state_change(chan, state, 0); 26789bc500eSGustavo F. Padovan } 26889bc500eSGustavo F. Padovan 269f8e73017SGustavo Padovan static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, 270f8e73017SGustavo Padovan int state, int err) 2712e0052e4SAndrei Emeltchenko { 272f8e73017SGustavo Padovan chan->state = state; 27353f52121SGustavo Padovan chan->ops->state_change(chan, chan->state, err); 2742e0052e4SAndrei Emeltchenko } 2752e0052e4SAndrei Emeltchenko 2762e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2772e0052e4SAndrei Emeltchenko { 278f8e73017SGustavo Padovan chan->ops->state_change(chan, chan->state, err); 2792e0052e4SAndrei Emeltchenko } 2802e0052e4SAndrei Emeltchenko 2814239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2824239d16fSMat Martineau { 2834239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2844239d16fSMat Martineau chan->retrans_timeout) { 2854239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2864239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2874239d16fSMat Martineau } 2884239d16fSMat Martineau } 2894239d16fSMat Martineau 2904239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2914239d16fSMat Martineau { 2924239d16fSMat Martineau __clear_retrans_timer(chan); 2934239d16fSMat Martineau if (chan->monitor_timeout) { 2944239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2954239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2964239d16fSMat Martineau } 2974239d16fSMat Martineau } 2984239d16fSMat Martineau 299608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 300608bcc6dSMat Martineau u16 seq) 301608bcc6dSMat Martineau { 302608bcc6dSMat Martineau struct sk_buff *skb; 303608bcc6dSMat Martineau 304608bcc6dSMat Martineau skb_queue_walk(head, skb) { 305a4368ff3SJohan Hedberg if (bt_cb(skb)->l2cap.txseq == seq) 306608bcc6dSMat Martineau return skb; 307608bcc6dSMat Martineau } 308608bcc6dSMat Martineau 309608bcc6dSMat Martineau return NULL; 310608bcc6dSMat Martineau } 311608bcc6dSMat Martineau 3123c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 3133c588192SMat Martineau 3143c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 3153c588192SMat Martineau * SREJ requests that are received and for frames that are to be 3163c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 3173c588192SMat Martineau * list in an array, where membership in the list can also be checked 3183c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 3193c588192SMat Martineau * and removed from the head in constant time, without further memory 3203c588192SMat Martineau * allocs or frees. 3213c588192SMat Martineau */ 3223c588192SMat Martineau 3233c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 3243c588192SMat Martineau { 3253c588192SMat Martineau size_t alloc_size, i; 3263c588192SMat Martineau 3273c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 3283c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 3293c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 3303c588192SMat Martineau */ 3313c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 3323c588192SMat Martineau 3333c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 3343c588192SMat Martineau if (!seq_list->list) 3353c588192SMat Martineau return -ENOMEM; 3363c588192SMat Martineau 3373c588192SMat Martineau seq_list->mask = alloc_size - 1; 3383c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3393c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3403c588192SMat Martineau for (i = 0; i < alloc_size; i++) 3413c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3423c588192SMat Martineau 3433c588192SMat Martineau return 0; 3443c588192SMat Martineau } 3453c588192SMat Martineau 3463c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 3473c588192SMat Martineau { 3483c588192SMat Martineau kfree(seq_list->list); 3493c588192SMat Martineau } 3503c588192SMat Martineau 3513c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 3523c588192SMat Martineau u16 seq) 3533c588192SMat Martineau { 3543c588192SMat Martineau /* Constant-time check for list membership */ 3553c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 3563c588192SMat Martineau } 3573c588192SMat Martineau 35803a0c5d6SJohan Hedberg static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3593c588192SMat Martineau { 36003a0c5d6SJohan Hedberg u16 seq = seq_list->head; 3613c588192SMat Martineau u16 mask = seq_list->mask; 3623c588192SMat Martineau 3633c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 3643c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3653c588192SMat Martineau 3663c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3673c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3683c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3693c588192SMat Martineau } 3703c588192SMat Martineau 3713c588192SMat Martineau return seq; 3723c588192SMat Martineau } 3733c588192SMat Martineau 3743c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3753c588192SMat Martineau { 3763c588192SMat Martineau u16 i; 377f522ae36SGustavo Padovan 378f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 379f522ae36SGustavo Padovan return; 380f522ae36SGustavo Padovan 3813c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3823c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3833c588192SMat Martineau 3843c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3853c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3863c588192SMat Martineau } 3873c588192SMat Martineau 3883c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3893c588192SMat Martineau { 3903c588192SMat Martineau u16 mask = seq_list->mask; 3913c588192SMat Martineau 3923c588192SMat Martineau /* All appends happen in constant time */ 3933c588192SMat Martineau 394f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 395f522ae36SGustavo Padovan return; 396f522ae36SGustavo Padovan 3973c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3983c588192SMat Martineau seq_list->head = seq; 3993c588192SMat Martineau else 4003c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 4013c588192SMat Martineau 4023c588192SMat Martineau seq_list->tail = seq; 4033c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 4043c588192SMat Martineau } 4053c588192SMat Martineau 406721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 407ab07801dSGustavo F. Padovan { 408721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 409721c4181SGustavo F. Padovan chan_timer.work); 4103df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 411ab07801dSGustavo F. Padovan int reason; 412ab07801dSGustavo F. Padovan 413e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 414ab07801dSGustavo F. Padovan 4153df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 4166be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 417ab07801dSGustavo F. Padovan 41889bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 419ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 42089bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 421ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 422ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 423ab07801dSGustavo F. Padovan else 424ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 425ab07801dSGustavo F. Padovan 4260f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 427ab07801dSGustavo F. Padovan 4286be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 429ab07801dSGustavo F. Padovan 43080b98027SGustavo Padovan chan->ops->close(chan); 4313df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4323df91ea2SAndrei Emeltchenko 433371fd835SUlisses Furquim l2cap_chan_put(chan); 434ab07801dSGustavo F. Padovan } 435ab07801dSGustavo F. Padovan 436eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 4370a708f8fSGustavo F. Padovan { 43848454079SGustavo F. Padovan struct l2cap_chan *chan; 4390a708f8fSGustavo F. Padovan 44048454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 44148454079SGustavo F. Padovan if (!chan) 44248454079SGustavo F. Padovan return NULL; 4430a708f8fSGustavo F. Padovan 444c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 445c03b355eSAndrei Emeltchenko 446ff714119SJohan Hedberg /* Set default lock nesting level */ 447ff714119SJohan Hedberg atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL); 448ff714119SJohan Hedberg 449333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 45023691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 451333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 45223691d75SGustavo F. Padovan 453721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 454ab07801dSGustavo F. Padovan 45589bc500eSGustavo F. Padovan chan->state = BT_OPEN; 45689bc500eSGustavo F. Padovan 457144ad330SSyam Sidhardhan kref_init(&chan->kref); 45871ba0e56SGustavo F. Padovan 4592827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4602827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4612827011fSMat Martineau 462eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 463abc545b8SSzymon Janc 46448454079SGustavo F. Padovan return chan; 4650a708f8fSGustavo F. Padovan } 4666b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_create); 4670a708f8fSGustavo F. Padovan 468144ad330SSyam Sidhardhan static void l2cap_chan_destroy(struct kref *kref) 4696ff5abbfSGustavo F. Padovan { 470144ad330SSyam Sidhardhan struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); 471144ad330SSyam Sidhardhan 4724af66c69SJaganath Kanakkassery BT_DBG("chan %p", chan); 4734af66c69SJaganath Kanakkassery 474333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 47523691d75SGustavo F. Padovan list_del(&chan->global_l); 476333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 47723691d75SGustavo F. Padovan 4784af66c69SJaganath Kanakkassery kfree(chan); 4796ff5abbfSGustavo F. Padovan } 4806ff5abbfSGustavo F. Padovan 48130648372SJaganath Kanakkassery void l2cap_chan_hold(struct l2cap_chan *c) 48230648372SJaganath Kanakkassery { 483144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 48430648372SJaganath Kanakkassery 485144ad330SSyam Sidhardhan kref_get(&c->kref); 48630648372SJaganath Kanakkassery } 48730648372SJaganath Kanakkassery 48830648372SJaganath Kanakkassery void l2cap_chan_put(struct l2cap_chan *c) 48930648372SJaganath Kanakkassery { 490144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 49130648372SJaganath Kanakkassery 492144ad330SSyam Sidhardhan kref_put(&c->kref, l2cap_chan_destroy); 49330648372SJaganath Kanakkassery } 4946b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_put); 49530648372SJaganath Kanakkassery 496bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 497bd4b1653SAndrei Emeltchenko { 498bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 499bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 500bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 501bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 5026a5e8165SJukka Rissanen chan->remote_max_tx = chan->max_tx; 5036a5e8165SJukka Rissanen chan->remote_tx_win = chan->tx_win; 504c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 505bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 5066a5e8165SJukka Rissanen chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 5076a5e8165SJukka Rissanen chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; 5086a5e8165SJukka Rissanen chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; 5096a5e8165SJukka Rissanen chan->conf_state = 0; 510bd4b1653SAndrei Emeltchenko 511bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 512bd4b1653SAndrei Emeltchenko } 5136b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); 514bd4b1653SAndrei Emeltchenko 5150ce43ce6SJohan Hedberg static void l2cap_le_flowctl_init(struct l2cap_chan *chan) 51638319713SJohan Hedberg { 5170ce43ce6SJohan Hedberg chan->sdu = NULL; 5180ce43ce6SJohan Hedberg chan->sdu_last_frag = NULL; 5190ce43ce6SJohan Hedberg chan->sdu_len = 0; 5200cd75f7eSJohan Hedberg chan->tx_credits = 0; 521f15b8ecfSJohan Hedberg chan->rx_credits = le_max_credits; 522d1d79413SJohan Hedberg chan->mps = min_t(u16, chan->imtu, le_default_mps); 5230ce43ce6SJohan Hedberg 5240ce43ce6SJohan Hedberg skb_queue_head_init(&chan->tx_q); 52538319713SJohan Hedberg } 52638319713SJohan Hedberg 52793c3e8f5SAndrei Emeltchenko void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 5280a708f8fSGustavo F. Padovan { 5290a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 530097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 5310a708f8fSGustavo F. Padovan 5329f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 5330a708f8fSGustavo F. Padovan 5348c1d787bSGustavo F. Padovan chan->conn = conn; 5350a708f8fSGustavo F. Padovan 5365491120eSAndrei Emeltchenko switch (chan->chan_type) { 5375491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 5380a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 539fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 54021626e62SJohan Hedberg if (conn->hcon->type == ACL_LINK) 5410c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5425491120eSAndrei Emeltchenko break; 5435491120eSAndrei Emeltchenko 5445491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_LESS: 5450a708f8fSGustavo F. Padovan /* Connectionless socket */ 546fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 547fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 5480c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5495491120eSAndrei Emeltchenko break; 5505491120eSAndrei Emeltchenko 5512338a7e0SJohan Hedberg case L2CAP_CHAN_FIXED: 5522338a7e0SJohan Hedberg /* Caller will set CID and CID specific MTU values */ 553416fa752SAndrei Emeltchenko break; 554416fa752SAndrei Emeltchenko 5555491120eSAndrei Emeltchenko default: 5560a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 557fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 558fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 5590c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5600a708f8fSGustavo F. Padovan } 5610a708f8fSGustavo F. Padovan 5628f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 5638f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 5648f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 5658f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 5668f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 5678936fa6dSAndrei Emeltchenko chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; 5688f7975b1SAndrei Emeltchenko 569371fd835SUlisses Furquim l2cap_chan_hold(chan); 570baa7e1faSGustavo F. Padovan 571c16900cfSJohan Hedberg /* Only keep a reference for fixed channels if they requested it */ 572c16900cfSJohan Hedberg if (chan->chan_type != L2CAP_CHAN_FIXED || 573c16900cfSJohan Hedberg test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) 5745ee9891dSJohan Hedberg hci_conn_hold(conn->hcon); 5755ee9891dSJohan Hedberg 5763df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 577643162a8SAndrei Emeltchenko } 578643162a8SAndrei Emeltchenko 579466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 580643162a8SAndrei Emeltchenko { 581643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 582643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5833df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5840a708f8fSGustavo F. Padovan } 5850a708f8fSGustavo F. Padovan 586466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5870a708f8fSGustavo F. Padovan { 5888c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5890a708f8fSGustavo F. Padovan 590c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5910a708f8fSGustavo F. Padovan 59249d11741SJohan Hedberg BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err, 59349d11741SJohan Hedberg state_to_string(chan->state)); 5940a708f8fSGustavo F. Padovan 59572847ce0SJohan Hedberg chan->ops->teardown(chan, err); 59672847ce0SJohan Hedberg 5970a708f8fSGustavo F. Padovan if (conn) { 59856f60984SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 599baa7e1faSGustavo F. Padovan /* Delete from channel list */ 6003df91ea2SAndrei Emeltchenko list_del(&chan->list); 6013d57dc68SGustavo F. Padovan 602371fd835SUlisses Furquim l2cap_chan_put(chan); 603baa7e1faSGustavo F. Padovan 6048c1d787bSGustavo F. Padovan chan->conn = NULL; 6053cabbfdaSAndrei Emeltchenko 606c16900cfSJohan Hedberg /* Reference was only held for non-fixed channels or 607c16900cfSJohan Hedberg * fixed channels that explicitly requested it using the 608c16900cfSJohan Hedberg * FLAG_HOLD_HCI_CONN flag. 609c16900cfSJohan Hedberg */ 610c16900cfSJohan Hedberg if (chan->chan_type != L2CAP_CHAN_FIXED || 611c16900cfSJohan Hedberg test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) 61276a68ba0SDavid Herrmann hci_conn_drop(conn->hcon); 61356f60984SAndrei Emeltchenko 61456f60984SAndrei Emeltchenko if (mgr && mgr->bredr_chan == chan) 61556f60984SAndrei Emeltchenko mgr->bredr_chan = NULL; 6160a708f8fSGustavo F. Padovan } 6170a708f8fSGustavo F. Padovan 618419e08c1SAndrei Emeltchenko if (chan->hs_hchan) { 619419e08c1SAndrei Emeltchenko struct hci_chan *hs_hchan = chan->hs_hchan; 620419e08c1SAndrei Emeltchenko 621419e08c1SAndrei Emeltchenko BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); 622419e08c1SAndrei Emeltchenko amp_disconnect_logical_link(hs_hchan); 623419e08c1SAndrei Emeltchenko } 624419e08c1SAndrei Emeltchenko 6252827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 6266ff5abbfSGustavo F. Padovan return; 6272ead70b8SGustavo F. Padovan 628ee556f66SGustavo Padovan switch(chan->mode) { 629ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 630ee556f66SGustavo Padovan break; 6310a708f8fSGustavo F. Padovan 63238319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 633177f8f2bSJohan Hedberg skb_queue_purge(&chan->tx_q); 63438319713SJohan Hedberg break; 63538319713SJohan Hedberg 636ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 6371a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 6381a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 6391a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 6400a708f8fSGustavo F. Padovan 641f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 6420a708f8fSGustavo F. Padovan 6433c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 6443c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 645ee556f66SGustavo Padovan 646ee556f66SGustavo Padovan /* fall through */ 647ee556f66SGustavo Padovan 648ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 649ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 650ee556f66SGustavo Padovan break; 6510a708f8fSGustavo F. Padovan } 652ee556f66SGustavo Padovan 653ee556f66SGustavo Padovan return; 6540a708f8fSGustavo F. Padovan } 6556b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_del); 6560a708f8fSGustavo F. Padovan 657f3d82d0cSJohan Hedberg static void l2cap_conn_update_id_addr(struct work_struct *work) 658387a33e3SJohan Hedberg { 659f3d82d0cSJohan Hedberg struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 660f3d82d0cSJohan Hedberg id_addr_update_work); 661f3d82d0cSJohan Hedberg struct hci_conn *hcon = conn->hcon; 662387a33e3SJohan Hedberg struct l2cap_chan *chan; 663387a33e3SJohan Hedberg 664387a33e3SJohan Hedberg mutex_lock(&conn->chan_lock); 665387a33e3SJohan Hedberg 666387a33e3SJohan Hedberg list_for_each_entry(chan, &conn->chan_l, list) { 667387a33e3SJohan Hedberg l2cap_chan_lock(chan); 668387a33e3SJohan Hedberg bacpy(&chan->dst, &hcon->dst); 669a250e048SJohan Hedberg chan->dst_type = bdaddr_dst_type(hcon); 670387a33e3SJohan Hedberg l2cap_chan_unlock(chan); 671387a33e3SJohan Hedberg } 672387a33e3SJohan Hedberg 673387a33e3SJohan Hedberg mutex_unlock(&conn->chan_lock); 674387a33e3SJohan Hedberg } 675387a33e3SJohan Hedberg 67627e2d4c8SJohan Hedberg static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) 67727e2d4c8SJohan Hedberg { 67827e2d4c8SJohan Hedberg struct l2cap_conn *conn = chan->conn; 67927e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 68027e2d4c8SJohan Hedberg u16 result; 68127e2d4c8SJohan Hedberg 68227e2d4c8SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) 68327e2d4c8SJohan Hedberg result = L2CAP_CR_AUTHORIZATION; 68427e2d4c8SJohan Hedberg else 68527e2d4c8SJohan Hedberg result = L2CAP_CR_BAD_PSM; 68627e2d4c8SJohan Hedberg 68727e2d4c8SJohan Hedberg l2cap_state_change(chan, BT_DISCONN); 68827e2d4c8SJohan Hedberg 68927e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 69027e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 6913916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 6920cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(chan->rx_credits); 69327e2d4c8SJohan Hedberg rsp.result = cpu_to_le16(result); 69427e2d4c8SJohan Hedberg 69527e2d4c8SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), 69627e2d4c8SJohan Hedberg &rsp); 69727e2d4c8SJohan Hedberg } 69827e2d4c8SJohan Hedberg 699791d60f7SJohan Hedberg static void l2cap_chan_connect_reject(struct l2cap_chan *chan) 700791d60f7SJohan Hedberg { 701791d60f7SJohan Hedberg struct l2cap_conn *conn = chan->conn; 702791d60f7SJohan Hedberg struct l2cap_conn_rsp rsp; 703791d60f7SJohan Hedberg u16 result; 704791d60f7SJohan Hedberg 705791d60f7SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) 706791d60f7SJohan Hedberg result = L2CAP_CR_SEC_BLOCK; 707791d60f7SJohan Hedberg else 708791d60f7SJohan Hedberg result = L2CAP_CR_BAD_PSM; 709791d60f7SJohan Hedberg 710791d60f7SJohan Hedberg l2cap_state_change(chan, BT_DISCONN); 711791d60f7SJohan Hedberg 712791d60f7SJohan Hedberg rsp.scid = cpu_to_le16(chan->dcid); 713791d60f7SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 714791d60f7SJohan Hedberg rsp.result = cpu_to_le16(result); 715dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 716791d60f7SJohan Hedberg 717791d60f7SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 718791d60f7SJohan Hedberg } 719791d60f7SJohan Hedberg 7200f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 7214519de9aSGustavo F. Padovan { 7224519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 7234519de9aSGustavo F. Padovan 7247eafc59eSMarcel Holtmann BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 7254519de9aSGustavo F. Padovan 72689bc500eSGustavo F. Padovan switch (chan->state) { 7274519de9aSGustavo F. Padovan case BT_LISTEN: 728c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 7294519de9aSGustavo F. Padovan break; 7304519de9aSGustavo F. Padovan 7314519de9aSGustavo F. Padovan case BT_CONNECTED: 7324519de9aSGustavo F. Padovan case BT_CONFIG: 7337b25c9b3SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 7348d836d71SGustavo Padovan __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 7355e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, reason); 7364519de9aSGustavo F. Padovan } else 7374519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7384519de9aSGustavo F. Padovan break; 7394519de9aSGustavo F. Padovan 7404519de9aSGustavo F. Padovan case BT_CONNECT2: 741791d60f7SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 742791d60f7SJohan Hedberg if (conn->hcon->type == ACL_LINK) 743791d60f7SJohan Hedberg l2cap_chan_connect_reject(chan); 74427e2d4c8SJohan Hedberg else if (conn->hcon->type == LE_LINK) 74527e2d4c8SJohan Hedberg l2cap_chan_le_connect_reject(chan); 7464519de9aSGustavo F. Padovan } 7474519de9aSGustavo F. Padovan 7484519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7494519de9aSGustavo F. Padovan break; 7504519de9aSGustavo F. Padovan 7514519de9aSGustavo F. Padovan case BT_CONNECT: 7524519de9aSGustavo F. Padovan case BT_DISCONN: 7534519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7544519de9aSGustavo F. Padovan break; 7554519de9aSGustavo F. Padovan 7564519de9aSGustavo F. Padovan default: 757c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 7584519de9aSGustavo F. Padovan break; 7594519de9aSGustavo F. Padovan } 7604519de9aSGustavo F. Padovan } 7616b8d4a6aSJukka Rissanen EXPORT_SYMBOL(l2cap_chan_close); 7624519de9aSGustavo F. Padovan 7634343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 7640a708f8fSGustavo F. Padovan { 7656a974b50SMarcel Holtmann switch (chan->chan_type) { 7666a974b50SMarcel Holtmann case L2CAP_CHAN_RAW: 7674343478fSGustavo F. Padovan switch (chan->sec_level) { 7680a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 7697d513e92SMarcel Holtmann case BT_SECURITY_FIPS: 7700a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 7710a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 7720a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 7730a708f8fSGustavo F. Padovan default: 7740a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7750a708f8fSGustavo F. Padovan } 7766a974b50SMarcel Holtmann break; 7773124b843SMarcel Holtmann case L2CAP_CHAN_CONN_LESS: 778dcf4adbfSJoe Perches if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { 7793124b843SMarcel Holtmann if (chan->sec_level == BT_SECURITY_LOW) 7803124b843SMarcel Holtmann chan->sec_level = BT_SECURITY_SDP; 7813124b843SMarcel Holtmann } 7827d513e92SMarcel Holtmann if (chan->sec_level == BT_SECURITY_HIGH || 7837d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 7843124b843SMarcel Holtmann return HCI_AT_NO_BONDING_MITM; 7853124b843SMarcel Holtmann else 7863124b843SMarcel Holtmann return HCI_AT_NO_BONDING; 7873124b843SMarcel Holtmann break; 7886a974b50SMarcel Holtmann case L2CAP_CHAN_CONN_ORIENTED: 789dcf4adbfSJoe Perches if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { 7904343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 7914343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 7920a708f8fSGustavo F. Padovan 7937d513e92SMarcel Holtmann if (chan->sec_level == BT_SECURITY_HIGH || 7947d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 7950a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 7960a708f8fSGustavo F. Padovan else 7970a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7986a974b50SMarcel Holtmann } 7996a974b50SMarcel Holtmann /* fall through */ 8006a974b50SMarcel Holtmann default: 8014343478fSGustavo F. Padovan switch (chan->sec_level) { 8020a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 8037d513e92SMarcel Holtmann case BT_SECURITY_FIPS: 8040a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 8050a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 8060a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 8070a708f8fSGustavo F. Padovan default: 8080a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 8090a708f8fSGustavo F. Padovan } 8106a974b50SMarcel Holtmann break; 8110a708f8fSGustavo F. Padovan } 8120a708f8fSGustavo F. Padovan } 8130a708f8fSGustavo F. Padovan 8140a708f8fSGustavo F. Padovan /* Service level security */ 815e7cafc45SJohan Hedberg int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator) 8160a708f8fSGustavo F. Padovan { 8178c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 8180a708f8fSGustavo F. Padovan __u8 auth_type; 8190a708f8fSGustavo F. Padovan 820a17de2feSJohan Hedberg if (conn->hcon->type == LE_LINK) 821a17de2feSJohan Hedberg return smp_conn_security(conn->hcon, chan->sec_level); 822a17de2feSJohan Hedberg 8234343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 8240a708f8fSGustavo F. Padovan 825e7cafc45SJohan Hedberg return hci_conn_security(conn->hcon, chan->sec_level, auth_type, 826e7cafc45SJohan Hedberg initiator); 8270a708f8fSGustavo F. Padovan } 8280a708f8fSGustavo F. Padovan 829b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 8300a708f8fSGustavo F. Padovan { 8310a708f8fSGustavo F. Padovan u8 id; 8320a708f8fSGustavo F. Padovan 8330a708f8fSGustavo F. Padovan /* Get next available identificator. 8340a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 8350a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 8360a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 8370a708f8fSGustavo F. Padovan */ 8380a708f8fSGustavo F. Padovan 8395a54e7c8SMarcel Holtmann mutex_lock(&conn->ident_lock); 8400a708f8fSGustavo F. Padovan 8410a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 8420a708f8fSGustavo F. Padovan conn->tx_ident = 1; 8430a708f8fSGustavo F. Padovan 8440a708f8fSGustavo F. Padovan id = conn->tx_ident; 8450a708f8fSGustavo F. Padovan 8465a54e7c8SMarcel Holtmann mutex_unlock(&conn->ident_lock); 8470a708f8fSGustavo F. Padovan 8480a708f8fSGustavo F. Padovan return id; 8490a708f8fSGustavo F. Padovan } 8500a708f8fSGustavo F. Padovan 8512d792818SGustavo Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 8522d792818SGustavo Padovan void *data) 8530a708f8fSGustavo F. Padovan { 8540a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 8550a708f8fSGustavo F. Padovan u8 flags; 8560a708f8fSGustavo F. Padovan 8570a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 8580a708f8fSGustavo F. Padovan 8590a708f8fSGustavo F. Padovan if (!skb) 8600a708f8fSGustavo F. Padovan return; 8610a708f8fSGustavo F. Padovan 862f6af675eSSteven Walter /* Use NO_FLUSH if supported or we have an LE link (which does 863f6af675eSSteven Walter * not support auto-flushing packets) */ 864f6af675eSSteven Walter if (lmp_no_flush_capable(conn->hcon->hdev) || 865f6af675eSSteven Walter conn->hcon->type == LE_LINK) 8660a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 8670a708f8fSGustavo F. Padovan else 8680a708f8fSGustavo F. Padovan flags = ACL_START; 8690a708f8fSGustavo F. Padovan 87014b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 8715e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 87214b12d0bSJaikumar Ganesh 87373d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 8740a708f8fSGustavo F. Padovan } 8750a708f8fSGustavo F. Padovan 87602b0fbb9SMat Martineau static bool __chan_is_moving(struct l2cap_chan *chan) 87702b0fbb9SMat Martineau { 87802b0fbb9SMat Martineau return chan->move_state != L2CAP_MOVE_STABLE && 87902b0fbb9SMat Martineau chan->move_state != L2CAP_MOVE_WAIT_PREPARE; 88002b0fbb9SMat Martineau } 88102b0fbb9SMat Martineau 88273d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 88373d80debSLuiz Augusto von Dentz { 88473d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 88573d80debSLuiz Augusto von Dentz u16 flags; 88673d80debSLuiz Augusto von Dentz 88773d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 88873d80debSLuiz Augusto von Dentz skb->priority); 88973d80debSLuiz Augusto von Dentz 890d5f8a75dSMat Martineau if (chan->hs_hcon && !__chan_is_moving(chan)) { 891d5f8a75dSMat Martineau if (chan->hs_hchan) 892d5f8a75dSMat Martineau hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); 893d5f8a75dSMat Martineau else 894d5f8a75dSMat Martineau kfree_skb(skb); 895d5f8a75dSMat Martineau 896d5f8a75dSMat Martineau return; 897d5f8a75dSMat Martineau } 898d5f8a75dSMat Martineau 899f6af675eSSteven Walter /* Use NO_FLUSH for LE links (where this is the only option) or 900f6af675eSSteven Walter * if the BR/EDR link supports it and flushing has not been 901f6af675eSSteven Walter * explicitly requested (through FLAG_FLUSHABLE). 902f6af675eSSteven Walter */ 903f6af675eSSteven Walter if (hcon->type == LE_LINK || 904f6af675eSSteven Walter (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 905f6af675eSSteven Walter lmp_no_flush_capable(hcon->hdev))) 90673d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 90773d80debSLuiz Augusto von Dentz else 90873d80debSLuiz Augusto von Dentz flags = ACL_START; 90973d80debSLuiz Augusto von Dentz 91073d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 91173d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 9120a708f8fSGustavo F. Padovan } 9130a708f8fSGustavo F. Padovan 914b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 915b5c6aaedSMat Martineau { 916b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 917b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 918b5c6aaedSMat Martineau 919b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 920b5c6aaedSMat Martineau /* S-Frame */ 921b5c6aaedSMat Martineau control->sframe = 1; 922b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 923b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 924b5c6aaedSMat Martineau 925b5c6aaedSMat Martineau control->sar = 0; 926b5c6aaedSMat Martineau control->txseq = 0; 927b5c6aaedSMat Martineau } else { 928b5c6aaedSMat Martineau /* I-Frame */ 929b5c6aaedSMat Martineau control->sframe = 0; 930b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 931b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 932b5c6aaedSMat Martineau 933b5c6aaedSMat Martineau control->poll = 0; 934b5c6aaedSMat Martineau control->super = 0; 935b5c6aaedSMat Martineau } 936b5c6aaedSMat Martineau } 937b5c6aaedSMat Martineau 938b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 939b5c6aaedSMat Martineau { 940b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 941b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 942b5c6aaedSMat Martineau 943b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 944b5c6aaedSMat Martineau /* S-Frame */ 945b5c6aaedSMat Martineau control->sframe = 1; 946b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 947b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 948b5c6aaedSMat Martineau 949b5c6aaedSMat Martineau control->sar = 0; 950b5c6aaedSMat Martineau control->txseq = 0; 951b5c6aaedSMat Martineau } else { 952b5c6aaedSMat Martineau /* I-Frame */ 953b5c6aaedSMat Martineau control->sframe = 0; 954b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 955b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 956b5c6aaedSMat Martineau 957b5c6aaedSMat Martineau control->poll = 0; 958b5c6aaedSMat Martineau control->super = 0; 959b5c6aaedSMat Martineau } 960b5c6aaedSMat Martineau } 961b5c6aaedSMat Martineau 962b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 963b5c6aaedSMat Martineau struct sk_buff *skb) 964b5c6aaedSMat Martineau { 965b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 966b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 967a4368ff3SJohan Hedberg &bt_cb(skb)->l2cap); 968cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 969b5c6aaedSMat Martineau } else { 970b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 971a4368ff3SJohan Hedberg &bt_cb(skb)->l2cap); 972cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 973b5c6aaedSMat Martineau } 974b5c6aaedSMat Martineau } 975b5c6aaedSMat Martineau 976b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 977b5c6aaedSMat Martineau { 978b5c6aaedSMat Martineau u32 packed; 979b5c6aaedSMat Martineau 980b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 981b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 982b5c6aaedSMat Martineau 983b5c6aaedSMat Martineau if (control->sframe) { 984b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 985b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 986b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 987b5c6aaedSMat Martineau } else { 988b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 989b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 990b5c6aaedSMat Martineau } 991b5c6aaedSMat Martineau 992b5c6aaedSMat Martineau return packed; 993b5c6aaedSMat Martineau } 994b5c6aaedSMat Martineau 995b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 996b5c6aaedSMat Martineau { 997b5c6aaedSMat Martineau u16 packed; 998b5c6aaedSMat Martineau 999b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 1000b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 1001b5c6aaedSMat Martineau 1002b5c6aaedSMat Martineau if (control->sframe) { 1003b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 1004b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 1005b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 1006b5c6aaedSMat Martineau } else { 1007b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 1008b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 1009b5c6aaedSMat Martineau } 1010b5c6aaedSMat Martineau 1011b5c6aaedSMat Martineau return packed; 1012b5c6aaedSMat Martineau } 1013b5c6aaedSMat Martineau 1014b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 1015b5c6aaedSMat Martineau struct l2cap_ctrl *control, 1016b5c6aaedSMat Martineau struct sk_buff *skb) 1017b5c6aaedSMat Martineau { 1018b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 1019b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 1020b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 1021b5c6aaedSMat Martineau } else { 1022b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 1023b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 1024b5c6aaedSMat Martineau } 1025b5c6aaedSMat Martineau } 1026b5c6aaedSMat Martineau 1027ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 1028ba7aa64fSGustavo Padovan { 1029ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 1030ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 1031ba7aa64fSGustavo Padovan else 1032ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 1033ba7aa64fSGustavo Padovan } 1034ba7aa64fSGustavo Padovan 1035a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 1036a67d7f6fSMat Martineau u32 control) 10370a708f8fSGustavo F. Padovan { 10380a708f8fSGustavo F. Padovan struct sk_buff *skb; 10390a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 1040ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 10410a708f8fSGustavo F. Padovan 10420a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 104303a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 10440a708f8fSGustavo F. Padovan 1045a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 10460a708f8fSGustavo F. Padovan 10470a708f8fSGustavo F. Padovan if (!skb) 1048a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 10490a708f8fSGustavo F. Padovan 10500a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 10510a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 1052fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 105388843ab0SAndrei Emeltchenko 1054a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 1055a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 1056a67d7f6fSMat Martineau else 1057a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 10580a708f8fSGustavo F. Padovan 105947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 1060a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 106103a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 10620a708f8fSGustavo F. Padovan } 10630a708f8fSGustavo F. Padovan 106473d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 1065a67d7f6fSMat Martineau return skb; 1066a67d7f6fSMat Martineau } 1067a67d7f6fSMat Martineau 1068a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 1069a67d7f6fSMat Martineau struct l2cap_ctrl *control) 1070a67d7f6fSMat Martineau { 1071a67d7f6fSMat Martineau struct sk_buff *skb; 1072a67d7f6fSMat Martineau u32 control_field; 1073a67d7f6fSMat Martineau 1074a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 1075a67d7f6fSMat Martineau 1076a67d7f6fSMat Martineau if (!control->sframe) 1077a67d7f6fSMat Martineau return; 1078a67d7f6fSMat Martineau 1079b99e13adSMat Martineau if (__chan_is_moving(chan)) 1080b99e13adSMat Martineau return; 1081b99e13adSMat Martineau 1082a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 1083a67d7f6fSMat Martineau !control->poll) 1084a67d7f6fSMat Martineau control->final = 1; 1085a67d7f6fSMat Martineau 1086a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 1087a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 1088a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 1089a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 1090a67d7f6fSMat Martineau 1091a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 1092a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 1093a67d7f6fSMat Martineau __clear_ack_timer(chan); 1094a67d7f6fSMat Martineau } 1095a67d7f6fSMat Martineau 1096a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 1097a67d7f6fSMat Martineau control->final, control->poll, control->super); 1098a67d7f6fSMat Martineau 1099a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 1100a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 1101a67d7f6fSMat Martineau else 1102a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 1103a67d7f6fSMat Martineau 1104a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 1105a67d7f6fSMat Martineau if (!IS_ERR(skb)) 110673d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 11070a708f8fSGustavo F. Padovan } 11080a708f8fSGustavo F. Padovan 1109c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 11100a708f8fSGustavo F. Padovan { 1111c9e3d5e0SMat Martineau struct l2cap_ctrl control; 11120a708f8fSGustavo F. Padovan 1113c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 1114c9e3d5e0SMat Martineau 1115c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 1116c9e3d5e0SMat Martineau control.sframe = 1; 1117c9e3d5e0SMat Martineau control.poll = poll; 1118c9e3d5e0SMat Martineau 1119c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 1120c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 1121c9e3d5e0SMat Martineau else 1122c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 1123c9e3d5e0SMat Martineau 1124c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 1125c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 11260a708f8fSGustavo F. Padovan } 11270a708f8fSGustavo F. Padovan 1128b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 11290a708f8fSGustavo F. Padovan { 11305ff6f34dSJohan Hedberg if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 11315ff6f34dSJohan Hedberg return true; 11325ff6f34dSJohan Hedberg 1133c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 11340a708f8fSGustavo F. Padovan } 11350a708f8fSGustavo F. Padovan 113693c3e8f5SAndrei Emeltchenko static bool __amp_capable(struct l2cap_chan *chan) 113793c3e8f5SAndrei Emeltchenko { 113893c3e8f5SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 11391df7b17aSMarcel Holtmann struct hci_dev *hdev; 11401df7b17aSMarcel Holtmann bool amp_available = false; 114193c3e8f5SAndrei Emeltchenko 11420bd49fc7SJohan Hedberg if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) 11431df7b17aSMarcel Holtmann return false; 11441df7b17aSMarcel Holtmann 11450bd49fc7SJohan Hedberg if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP)) 11461df7b17aSMarcel Holtmann return false; 11471df7b17aSMarcel Holtmann 11481df7b17aSMarcel Holtmann read_lock(&hci_dev_list_lock); 11491df7b17aSMarcel Holtmann list_for_each_entry(hdev, &hci_dev_list, list) { 11501df7b17aSMarcel Holtmann if (hdev->amp_type != AMP_TYPE_BREDR && 11511df7b17aSMarcel Holtmann test_bit(HCI_UP, &hdev->flags)) { 11521df7b17aSMarcel Holtmann amp_available = true; 11531df7b17aSMarcel Holtmann break; 11541df7b17aSMarcel Holtmann } 11551df7b17aSMarcel Holtmann } 11561df7b17aSMarcel Holtmann read_unlock(&hci_dev_list_lock); 11571df7b17aSMarcel Holtmann 11581df7b17aSMarcel Holtmann if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) 11591df7b17aSMarcel Holtmann return amp_available; 1160848566b3SMarcel Holtmann 116193c3e8f5SAndrei Emeltchenko return false; 116293c3e8f5SAndrei Emeltchenko } 116393c3e8f5SAndrei Emeltchenko 11645ce66b59SAndrei Emeltchenko static bool l2cap_check_efs(struct l2cap_chan *chan) 11655ce66b59SAndrei Emeltchenko { 11665ce66b59SAndrei Emeltchenko /* Check EFS parameters */ 11675ce66b59SAndrei Emeltchenko return true; 11685ce66b59SAndrei Emeltchenko } 11695ce66b59SAndrei Emeltchenko 11702766be48SAndrei Emeltchenko void l2cap_send_conn_req(struct l2cap_chan *chan) 11719b27f350SAndrei Emeltchenko { 11729b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 11739b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 11749b27f350SAndrei Emeltchenko 11759b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 11769b27f350SAndrei Emeltchenko req.psm = chan->psm; 11779b27f350SAndrei Emeltchenko 11789b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 11799b27f350SAndrei Emeltchenko 11809b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 11819b27f350SAndrei Emeltchenko 11829b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 11839b27f350SAndrei Emeltchenko } 11849b27f350SAndrei Emeltchenko 11858eb200bdSMat Martineau static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) 11868eb200bdSMat Martineau { 11878eb200bdSMat Martineau struct l2cap_create_chan_req req; 11888eb200bdSMat Martineau req.scid = cpu_to_le16(chan->scid); 11898eb200bdSMat Martineau req.psm = chan->psm; 11908eb200bdSMat Martineau req.amp_id = amp_id; 11918eb200bdSMat Martineau 11928eb200bdSMat Martineau chan->ident = l2cap_get_ident(chan->conn); 11938eb200bdSMat Martineau 11948eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, 11958eb200bdSMat Martineau sizeof(req), &req); 11968eb200bdSMat Martineau } 11978eb200bdSMat Martineau 119802b0fbb9SMat Martineau static void l2cap_move_setup(struct l2cap_chan *chan) 119902b0fbb9SMat Martineau { 120002b0fbb9SMat Martineau struct sk_buff *skb; 120102b0fbb9SMat Martineau 120202b0fbb9SMat Martineau BT_DBG("chan %p", chan); 120302b0fbb9SMat Martineau 120402b0fbb9SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 120502b0fbb9SMat Martineau return; 120602b0fbb9SMat Martineau 120702b0fbb9SMat Martineau __clear_retrans_timer(chan); 120802b0fbb9SMat Martineau __clear_monitor_timer(chan); 120902b0fbb9SMat Martineau __clear_ack_timer(chan); 121002b0fbb9SMat Martineau 121102b0fbb9SMat Martineau chan->retry_count = 0; 121202b0fbb9SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 1213a4368ff3SJohan Hedberg if (bt_cb(skb)->l2cap.retries) 1214a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries = 1; 121502b0fbb9SMat Martineau else 121602b0fbb9SMat Martineau break; 121702b0fbb9SMat Martineau } 121802b0fbb9SMat Martineau 121902b0fbb9SMat Martineau chan->expected_tx_seq = chan->buffer_seq; 122002b0fbb9SMat Martineau 122102b0fbb9SMat Martineau clear_bit(CONN_REJ_ACT, &chan->conn_state); 122202b0fbb9SMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 122302b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 122402b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->srej_list); 122502b0fbb9SMat Martineau skb_queue_purge(&chan->srej_q); 122602b0fbb9SMat Martineau 122702b0fbb9SMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 122802b0fbb9SMat Martineau chan->rx_state = L2CAP_RX_STATE_MOVE; 122902b0fbb9SMat Martineau 123002b0fbb9SMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 123102b0fbb9SMat Martineau } 123202b0fbb9SMat Martineau 12335f3847a4SMat Martineau static void l2cap_move_done(struct l2cap_chan *chan) 12345f3847a4SMat Martineau { 12355f3847a4SMat Martineau u8 move_role = chan->move_role; 12365f3847a4SMat Martineau BT_DBG("chan %p", chan); 12375f3847a4SMat Martineau 12385f3847a4SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 12395f3847a4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 12405f3847a4SMat Martineau 12415f3847a4SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 12425f3847a4SMat Martineau return; 12435f3847a4SMat Martineau 12445f3847a4SMat Martineau switch (move_role) { 12455f3847a4SMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 12465f3847a4SMat Martineau l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); 12475f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_F; 12485f3847a4SMat Martineau break; 12495f3847a4SMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 12505f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_P; 12515f3847a4SMat Martineau break; 12525f3847a4SMat Martineau } 12535f3847a4SMat Martineau } 12545f3847a4SMat Martineau 12559f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 12569f0caeb1SVinicius Costa Gomes { 1257315917e0SJohan Hedberg /* The channel may have already been flagged as connected in 1258315917e0SJohan Hedberg * case of receiving data before the L2CAP info req/rsp 1259315917e0SJohan Hedberg * procedure is complete. 1260315917e0SJohan Hedberg */ 1261315917e0SJohan Hedberg if (chan->state == BT_CONNECTED) 1262315917e0SJohan Hedberg return; 1263315917e0SJohan Hedberg 12642827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 12659f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 12669f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 12679f0caeb1SVinicius Costa Gomes 12680ce43ce6SJohan Hedberg if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) 12690ce43ce6SJohan Hedberg chan->ops->suspend(chan); 1270177f8f2bSJohan Hedberg 127154a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 12729f0caeb1SVinicius Costa Gomes 127354a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 12749f0caeb1SVinicius Costa Gomes } 12759f0caeb1SVinicius Costa Gomes 1276f1496deeSJohan Hedberg static void l2cap_le_connect(struct l2cap_chan *chan) 1277f1496deeSJohan Hedberg { 1278f1496deeSJohan Hedberg struct l2cap_conn *conn = chan->conn; 1279f1496deeSJohan Hedberg struct l2cap_le_conn_req req; 1280f1496deeSJohan Hedberg 1281595177f3SJohan Hedberg if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) 1282595177f3SJohan Hedberg return; 1283595177f3SJohan Hedberg 1284f1496deeSJohan Hedberg req.psm = chan->psm; 1285f1496deeSJohan Hedberg req.scid = cpu_to_le16(chan->scid); 1286f1496deeSJohan Hedberg req.mtu = cpu_to_le16(chan->imtu); 12873916aed8SJohan Hedberg req.mps = cpu_to_le16(chan->mps); 12880cd75f7eSJohan Hedberg req.credits = cpu_to_le16(chan->rx_credits); 1289f1496deeSJohan Hedberg 1290f1496deeSJohan Hedberg chan->ident = l2cap_get_ident(conn); 1291f1496deeSJohan Hedberg 1292f1496deeSJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, 1293f1496deeSJohan Hedberg sizeof(req), &req); 1294f1496deeSJohan Hedberg } 1295f1496deeSJohan Hedberg 1296f1496deeSJohan Hedberg static void l2cap_le_start(struct l2cap_chan *chan) 1297f1496deeSJohan Hedberg { 1298f1496deeSJohan Hedberg struct l2cap_conn *conn = chan->conn; 1299f1496deeSJohan Hedberg 1300f1496deeSJohan Hedberg if (!smp_conn_security(conn->hcon, chan->sec_level)) 1301f1496deeSJohan Hedberg return; 1302f1496deeSJohan Hedberg 1303f1496deeSJohan Hedberg if (!chan->psm) { 1304f1496deeSJohan Hedberg l2cap_chan_ready(chan); 1305f1496deeSJohan Hedberg return; 1306f1496deeSJohan Hedberg } 1307f1496deeSJohan Hedberg 1308f1496deeSJohan Hedberg if (chan->state == BT_CONNECT) 1309f1496deeSJohan Hedberg l2cap_le_connect(chan); 1310f1496deeSJohan Hedberg } 1311f1496deeSJohan Hedberg 131293c3e8f5SAndrei Emeltchenko static void l2cap_start_connection(struct l2cap_chan *chan) 131393c3e8f5SAndrei Emeltchenko { 131493c3e8f5SAndrei Emeltchenko if (__amp_capable(chan)) { 131593c3e8f5SAndrei Emeltchenko BT_DBG("chan %p AMP capable: discover AMPs", chan); 131693c3e8f5SAndrei Emeltchenko a2mp_discover_amp(chan); 1317f1496deeSJohan Hedberg } else if (chan->conn->hcon->type == LE_LINK) { 1318f1496deeSJohan Hedberg l2cap_le_start(chan); 131993c3e8f5SAndrei Emeltchenko } else { 132093c3e8f5SAndrei Emeltchenko l2cap_send_conn_req(chan); 132193c3e8f5SAndrei Emeltchenko } 132293c3e8f5SAndrei Emeltchenko } 132393c3e8f5SAndrei Emeltchenko 1324aeaeb4bbSJohan Hedberg static void l2cap_request_info(struct l2cap_conn *conn) 13250a708f8fSGustavo F. Padovan { 13260a708f8fSGustavo F. Padovan struct l2cap_info_req req; 1327aeaeb4bbSJohan Hedberg 1328aeaeb4bbSJohan Hedberg if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1329aeaeb4bbSJohan Hedberg return; 1330aeaeb4bbSJohan Hedberg 1331dcf4adbfSJoe Perches req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 13320a708f8fSGustavo F. Padovan 13330a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 13340a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 13350a708f8fSGustavo F. Padovan 1336ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 13370a708f8fSGustavo F. Padovan 13382d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 13392d792818SGustavo Padovan sizeof(req), &req); 13400a708f8fSGustavo F. Padovan } 1341aeaeb4bbSJohan Hedberg 1342aeaeb4bbSJohan Hedberg static void l2cap_do_start(struct l2cap_chan *chan) 1343aeaeb4bbSJohan Hedberg { 1344aeaeb4bbSJohan Hedberg struct l2cap_conn *conn = chan->conn; 1345aeaeb4bbSJohan Hedberg 1346aeaeb4bbSJohan Hedberg if (conn->hcon->type == LE_LINK) { 1347aeaeb4bbSJohan Hedberg l2cap_le_start(chan); 1348aeaeb4bbSJohan Hedberg return; 1349aeaeb4bbSJohan Hedberg } 1350aeaeb4bbSJohan Hedberg 1351aeaeb4bbSJohan Hedberg if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) { 1352aeaeb4bbSJohan Hedberg l2cap_request_info(conn); 1353aeaeb4bbSJohan Hedberg return; 1354aeaeb4bbSJohan Hedberg } 1355aeaeb4bbSJohan Hedberg 1356aeaeb4bbSJohan Hedberg if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 1357aeaeb4bbSJohan Hedberg return; 1358aeaeb4bbSJohan Hedberg 1359aeaeb4bbSJohan Hedberg if (l2cap_chan_check_security(chan, true) && 1360aeaeb4bbSJohan Hedberg __l2cap_no_conn_pending(chan)) 1361aeaeb4bbSJohan Hedberg l2cap_start_connection(chan); 13620a708f8fSGustavo F. Padovan } 13630a708f8fSGustavo F. Padovan 13640a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 13650a708f8fSGustavo F. Padovan { 13660a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 13670a708f8fSGustavo F. Padovan if (!disable_ertm) 13680a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 13690a708f8fSGustavo F. Padovan 13700a708f8fSGustavo F. Padovan switch (mode) { 13710a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 13720a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 13730a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 13740a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 13750a708f8fSGustavo F. Padovan default: 13760a708f8fSGustavo F. Padovan return 0x00; 13770a708f8fSGustavo F. Padovan } 13780a708f8fSGustavo F. Padovan } 13790a708f8fSGustavo F. Padovan 13805e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) 13810a708f8fSGustavo F. Padovan { 13825e4e3972SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 13830a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 13840a708f8fSGustavo F. Padovan 13850a708f8fSGustavo F. Padovan if (!conn) 13860a708f8fSGustavo F. Padovan return; 13870a708f8fSGustavo F. Padovan 1388aad3d0e3SAndrei Emeltchenko if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { 13891a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 13901a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 13911a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 13920a708f8fSGustavo F. Padovan } 13930a708f8fSGustavo F. Padovan 13942338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 1395d117773cSGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 1396416fa752SAndrei Emeltchenko return; 1397416fa752SAndrei Emeltchenko } 1398416fa752SAndrei Emeltchenko 1399fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1400fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 14012d792818SGustavo Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, 14022d792818SGustavo Padovan sizeof(req), &req); 14030a708f8fSGustavo F. Padovan 1404f8e73017SGustavo Padovan l2cap_state_change_and_error(chan, BT_DISCONN, err); 14050a708f8fSGustavo F. Padovan } 14060a708f8fSGustavo F. Padovan 14070a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 14080a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 14090a708f8fSGustavo F. Padovan { 14103df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 14110a708f8fSGustavo F. Padovan 14120a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14130a708f8fSGustavo F. Padovan 14143df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 14150a708f8fSGustavo F. Padovan 14163df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 14176be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 14180a708f8fSGustavo F. Padovan 1419715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1420aeaeb4bbSJohan Hedberg l2cap_chan_ready(chan); 14216be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14220a708f8fSGustavo F. Padovan continue; 14230a708f8fSGustavo F. Padovan } 14240a708f8fSGustavo F. Padovan 142589bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1426e7cafc45SJohan Hedberg if (!l2cap_chan_check_security(chan, true) || 1427b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 14286be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14290a708f8fSGustavo F. Padovan continue; 14300a708f8fSGustavo F. Padovan } 14310a708f8fSGustavo F. Padovan 1432c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1433c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1434c1360a1cSGustavo F. Padovan &chan->conf_state)) { 14350f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 14366be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14370a708f8fSGustavo F. Padovan continue; 14380a708f8fSGustavo F. Padovan } 14390a708f8fSGustavo F. Padovan 144093c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 14410a708f8fSGustavo F. Padovan 144289bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 14430a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 14440a708f8fSGustavo F. Padovan char buf[128]; 1445fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1446fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 14470a708f8fSGustavo F. Padovan 1448e7cafc45SJohan Hedberg if (l2cap_chan_check_security(chan, false)) { 1449bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 1450dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_PEND); 1451dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 14522dc4e510SGustavo Padovan chan->ops->defer(chan); 14530a708f8fSGustavo F. Padovan 14540a708f8fSGustavo F. Padovan } else { 1455acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 1456dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 1457dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 14580a708f8fSGustavo F. Padovan } 14590a708f8fSGustavo F. Padovan } else { 1460dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_PEND); 1461dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 14620a708f8fSGustavo F. Padovan } 14630a708f8fSGustavo F. Padovan 1464fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1465fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 14660a708f8fSGustavo F. Padovan 1467c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 14680a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 14696be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14700a708f8fSGustavo F. Padovan continue; 14710a708f8fSGustavo F. Padovan } 14720a708f8fSGustavo F. Padovan 1473c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 14740a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 147573ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 147673ffa904SGustavo F. Padovan chan->num_conf_req++; 14770a708f8fSGustavo F. Padovan } 14780a708f8fSGustavo F. Padovan 14796be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14800a708f8fSGustavo F. Padovan } 14810a708f8fSGustavo F. Padovan 14823df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14830a708f8fSGustavo F. Padovan } 14840a708f8fSGustavo F. Padovan 1485b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1486b62f328bSVille Tervo { 1487cc8dba2bSMarcel Holtmann struct hci_conn *hcon = conn->hcon; 1488dcc36c16SJohan Hedberg struct hci_dev *hdev = hcon->hdev; 1489b62f328bSVille Tervo 1490e760ec12SJohan Hedberg BT_DBG("%s conn %p", hdev->name, conn); 1491b62f328bSVille Tervo 1492e760ec12SJohan Hedberg /* For outgoing pairing which doesn't necessarily have an 1493e760ec12SJohan Hedberg * associated socket (e.g. mgmt_pair_device). 1494e760ec12SJohan Hedberg */ 1495e760ec12SJohan Hedberg if (hcon->out) 1496e760ec12SJohan Hedberg smp_conn_security(hcon, hcon->pending_sec_level); 1497cc8dba2bSMarcel Holtmann 149880afeb6cSMarcel Holtmann /* For LE slave connections, make sure the connection interval 149980afeb6cSMarcel Holtmann * is in the range of the minium and maximum interval that has 150080afeb6cSMarcel Holtmann * been configured for this connection. If not, then trigger 150180afeb6cSMarcel Holtmann * the connection update procedure. 150280afeb6cSMarcel Holtmann */ 150340bef302SJohan Hedberg if (hcon->role == HCI_ROLE_SLAVE && 150480afeb6cSMarcel Holtmann (hcon->le_conn_interval < hcon->le_conn_min_interval || 150580afeb6cSMarcel Holtmann hcon->le_conn_interval > hcon->le_conn_max_interval)) { 150680afeb6cSMarcel Holtmann struct l2cap_conn_param_update_req req; 150780afeb6cSMarcel Holtmann 150880afeb6cSMarcel Holtmann req.min = cpu_to_le16(hcon->le_conn_min_interval); 150980afeb6cSMarcel Holtmann req.max = cpu_to_le16(hcon->le_conn_max_interval); 151080afeb6cSMarcel Holtmann req.latency = cpu_to_le16(hcon->le_conn_latency); 151180afeb6cSMarcel Holtmann req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); 151280afeb6cSMarcel Holtmann 151380afeb6cSMarcel Holtmann l2cap_send_cmd(conn, l2cap_get_ident(conn), 151480afeb6cSMarcel Holtmann L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); 151580afeb6cSMarcel Holtmann } 1516b62f328bSVille Tervo } 1517b62f328bSVille Tervo 15180a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 15190a708f8fSGustavo F. Padovan { 152048454079SGustavo F. Padovan struct l2cap_chan *chan; 1521cc110922SVinicius Costa Gomes struct hci_conn *hcon = conn->hcon; 15220a708f8fSGustavo F. Padovan 15230a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 15240a708f8fSGustavo F. Padovan 1525aeaeb4bbSJohan Hedberg if (hcon->type == ACL_LINK) 1526aeaeb4bbSJohan Hedberg l2cap_request_info(conn); 1527aeaeb4bbSJohan Hedberg 1528e760ec12SJohan Hedberg mutex_lock(&conn->chan_lock); 1529e760ec12SJohan Hedberg 15303df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1531baa7e1faSGustavo F. Padovan 15326be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 15330a708f8fSGustavo F. Padovan 15342338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 1535416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1536416fa752SAndrei Emeltchenko continue; 1537416fa752SAndrei Emeltchenko } 1538416fa752SAndrei Emeltchenko 1539cc110922SVinicius Costa Gomes if (hcon->type == LE_LINK) { 1540f1496deeSJohan Hedberg l2cap_le_start(chan); 154163128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1542aeaeb4bbSJohan Hedberg if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 154374e75740SGustavo Padovan l2cap_chan_ready(chan); 15441c244f79SGustavo Padovan } else if (chan->state == BT_CONNECT) { 1545fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 15461c244f79SGustavo Padovan } 15470a708f8fSGustavo F. Padovan 15486be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 15490a708f8fSGustavo F. Padovan } 15500a708f8fSGustavo F. Padovan 15513df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 155261a939c6SJohan Hedberg 155379a05727SJohan Hedberg if (hcon->type == LE_LINK) 155479a05727SJohan Hedberg l2cap_le_conn_ready(conn); 155579a05727SJohan Hedberg 155661a939c6SJohan Hedberg queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); 15570a708f8fSGustavo F. Padovan } 15580a708f8fSGustavo F. Padovan 15590a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 15600a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 15610a708f8fSGustavo F. Padovan { 156248454079SGustavo F. Padovan struct l2cap_chan *chan; 15630a708f8fSGustavo F. Padovan 15640a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 15650a708f8fSGustavo F. Padovan 15663df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 15670a708f8fSGustavo F. Padovan 15683df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1569ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 15701d8b1fd5SGustavo Padovan l2cap_chan_set_err(chan, err); 15710a708f8fSGustavo F. Padovan } 15720a708f8fSGustavo F. Padovan 15733df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 15740a708f8fSGustavo F. Padovan } 15750a708f8fSGustavo F. Padovan 1576f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 15770a708f8fSGustavo F. Padovan { 1578f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1579030013d8SGustavo F. Padovan info_timer.work); 15800a708f8fSGustavo F. Padovan 15810a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 15820a708f8fSGustavo F. Padovan conn->info_ident = 0; 15830a708f8fSGustavo F. Padovan 15840a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 15850a708f8fSGustavo F. Padovan } 15860a708f8fSGustavo F. Padovan 15872c8e1411SDavid Herrmann /* 15882c8e1411SDavid Herrmann * l2cap_user 15892c8e1411SDavid Herrmann * External modules can register l2cap_user objects on l2cap_conn. The ->probe 15902c8e1411SDavid Herrmann * callback is called during registration. The ->remove callback is called 15912c8e1411SDavid Herrmann * during unregistration. 15922c8e1411SDavid Herrmann * An l2cap_user object can either be explicitly unregistered or when the 15932c8e1411SDavid Herrmann * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, 15942c8e1411SDavid Herrmann * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. 15952c8e1411SDavid Herrmann * External modules must own a reference to the l2cap_conn object if they intend 15962c8e1411SDavid Herrmann * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at 15972c8e1411SDavid Herrmann * any time if they don't. 15982c8e1411SDavid Herrmann */ 15992c8e1411SDavid Herrmann 16002c8e1411SDavid Herrmann int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) 16012c8e1411SDavid Herrmann { 16022c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 16032c8e1411SDavid Herrmann int ret; 16042c8e1411SDavid Herrmann 16052c8e1411SDavid Herrmann /* We need to check whether l2cap_conn is registered. If it is not, we 16062c8e1411SDavid Herrmann * must not register the l2cap_user. l2cap_conn_del() is unregisters 16072c8e1411SDavid Herrmann * l2cap_conn objects, but doesn't provide its own locking. Instead, it 16082c8e1411SDavid Herrmann * relies on the parent hci_conn object to be locked. This itself relies 16092c8e1411SDavid Herrmann * on the hci_dev object to be locked. So we must lock the hci device 16102c8e1411SDavid Herrmann * here, too. */ 16112c8e1411SDavid Herrmann 16122c8e1411SDavid Herrmann hci_dev_lock(hdev); 16132c8e1411SDavid Herrmann 1614835a6a2fSAlexey Dobriyan if (!list_empty(&user->list)) { 16152c8e1411SDavid Herrmann ret = -EINVAL; 16162c8e1411SDavid Herrmann goto out_unlock; 16172c8e1411SDavid Herrmann } 16182c8e1411SDavid Herrmann 16192c8e1411SDavid Herrmann /* conn->hchan is NULL after l2cap_conn_del() was called */ 16202c8e1411SDavid Herrmann if (!conn->hchan) { 16212c8e1411SDavid Herrmann ret = -ENODEV; 16222c8e1411SDavid Herrmann goto out_unlock; 16232c8e1411SDavid Herrmann } 16242c8e1411SDavid Herrmann 16252c8e1411SDavid Herrmann ret = user->probe(conn, user); 16262c8e1411SDavid Herrmann if (ret) 16272c8e1411SDavid Herrmann goto out_unlock; 16282c8e1411SDavid Herrmann 16292c8e1411SDavid Herrmann list_add(&user->list, &conn->users); 16302c8e1411SDavid Herrmann ret = 0; 16312c8e1411SDavid Herrmann 16322c8e1411SDavid Herrmann out_unlock: 16332c8e1411SDavid Herrmann hci_dev_unlock(hdev); 16342c8e1411SDavid Herrmann return ret; 16352c8e1411SDavid Herrmann } 16362c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_register_user); 16372c8e1411SDavid Herrmann 16382c8e1411SDavid Herrmann void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) 16392c8e1411SDavid Herrmann { 16402c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 16412c8e1411SDavid Herrmann 16422c8e1411SDavid Herrmann hci_dev_lock(hdev); 16432c8e1411SDavid Herrmann 1644835a6a2fSAlexey Dobriyan if (list_empty(&user->list)) 16452c8e1411SDavid Herrmann goto out_unlock; 16462c8e1411SDavid Herrmann 1647ab944c83STedd Ho-Jeong An list_del_init(&user->list); 16482c8e1411SDavid Herrmann user->remove(conn, user); 16492c8e1411SDavid Herrmann 16502c8e1411SDavid Herrmann out_unlock: 16512c8e1411SDavid Herrmann hci_dev_unlock(hdev); 16522c8e1411SDavid Herrmann } 16532c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_unregister_user); 16542c8e1411SDavid Herrmann 16552c8e1411SDavid Herrmann static void l2cap_unregister_all_users(struct l2cap_conn *conn) 16562c8e1411SDavid Herrmann { 16572c8e1411SDavid Herrmann struct l2cap_user *user; 16582c8e1411SDavid Herrmann 16592c8e1411SDavid Herrmann while (!list_empty(&conn->users)) { 16602c8e1411SDavid Herrmann user = list_first_entry(&conn->users, struct l2cap_user, list); 1661ab944c83STedd Ho-Jeong An list_del_init(&user->list); 16622c8e1411SDavid Herrmann user->remove(conn, user); 16632c8e1411SDavid Herrmann } 16642c8e1411SDavid Herrmann } 16652c8e1411SDavid Herrmann 16665d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 16675d3de7dfSVinicius Costa Gomes { 16685d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 16695d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 16705d3de7dfSVinicius Costa Gomes 16715d3de7dfSVinicius Costa Gomes if (!conn) 16725d3de7dfSVinicius Costa Gomes return; 16735d3de7dfSVinicius Costa Gomes 16745d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 16755d3de7dfSVinicius Costa Gomes 16765d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 16775d3de7dfSVinicius Costa Gomes 167861a939c6SJohan Hedberg skb_queue_purge(&conn->pending_rx); 16797ab56c3aSJukka Taimisto 16807ab56c3aSJukka Taimisto /* We can not call flush_work(&conn->pending_rx_work) here since we 16817ab56c3aSJukka Taimisto * might block if we are running on a worker from the same workqueue 16827ab56c3aSJukka Taimisto * pending_rx_work is waiting on. 16837ab56c3aSJukka Taimisto */ 16847ab56c3aSJukka Taimisto if (work_pending(&conn->pending_rx_work)) 16857ab56c3aSJukka Taimisto cancel_work_sync(&conn->pending_rx_work); 168661a939c6SJohan Hedberg 1687f3d82d0cSJohan Hedberg if (work_pending(&conn->id_addr_update_work)) 1688f3d82d0cSJohan Hedberg cancel_work_sync(&conn->id_addr_update_work); 1689f3d82d0cSJohan Hedberg 16902c8e1411SDavid Herrmann l2cap_unregister_all_users(conn); 16912c8e1411SDavid Herrmann 1692e31fb860SJohan Hedberg /* Force the connection to be immediately dropped */ 1693e31fb860SJohan Hedberg hcon->disc_timeout = 0; 1694e31fb860SJohan Hedberg 16953df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 16963df91ea2SAndrei Emeltchenko 16975d3de7dfSVinicius Costa Gomes /* Kill channels */ 16985d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 169961d6ef3eSMat Martineau l2cap_chan_hold(chan); 17006be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 17016be36555SAndrei Emeltchenko 17025d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 17036be36555SAndrei Emeltchenko 17046be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 17056be36555SAndrei Emeltchenko 170680b98027SGustavo Padovan chan->ops->close(chan); 170761d6ef3eSMat Martineau l2cap_chan_put(chan); 17085d3de7dfSVinicius Costa Gomes } 17095d3de7dfSVinicius Costa Gomes 17103df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 17113df91ea2SAndrei Emeltchenko 171273d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 171373d80debSLuiz Augusto von Dentz 17145d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1715127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 17165d3de7dfSVinicius Costa Gomes 17175d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 17189c903e37SDavid Herrmann conn->hchan = NULL; 17199c903e37SDavid Herrmann l2cap_conn_put(conn); 17205d3de7dfSVinicius Costa Gomes } 17215d3de7dfSVinicius Costa Gomes 17229c903e37SDavid Herrmann static void l2cap_conn_free(struct kref *ref) 17239c903e37SDavid Herrmann { 17249c903e37SDavid Herrmann struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); 17259c903e37SDavid Herrmann 17269c903e37SDavid Herrmann hci_conn_put(conn->hcon); 17279c903e37SDavid Herrmann kfree(conn); 17289c903e37SDavid Herrmann } 17299c903e37SDavid Herrmann 173051bb8457SJohan Hedberg struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn) 17319c903e37SDavid Herrmann { 17329c903e37SDavid Herrmann kref_get(&conn->ref); 173351bb8457SJohan Hedberg return conn; 17349c903e37SDavid Herrmann } 17359c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_get); 17369c903e37SDavid Herrmann 17379c903e37SDavid Herrmann void l2cap_conn_put(struct l2cap_conn *conn) 17389c903e37SDavid Herrmann { 17399c903e37SDavid Herrmann kref_put(&conn->ref, l2cap_conn_free); 17409c903e37SDavid Herrmann } 17419c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_put); 17429c903e37SDavid Herrmann 17430a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 17440a708f8fSGustavo F. Padovan 1745c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 17460a708f8fSGustavo F. Padovan * Returns closest match. 17470a708f8fSGustavo F. Padovan */ 1748c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1749c2287681SIdo Yariv bdaddr_t *src, 1750bf20fd4eSJohan Hedberg bdaddr_t *dst, 1751bf20fd4eSJohan Hedberg u8 link_type) 17520a708f8fSGustavo F. Padovan { 175323691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 17540a708f8fSGustavo F. Padovan 175523691d75SGustavo F. Padovan read_lock(&chan_list_lock); 17560a708f8fSGustavo F. Padovan 175723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 175889bc500eSGustavo F. Padovan if (state && c->state != state) 17590a708f8fSGustavo F. Padovan continue; 17600a708f8fSGustavo F. Padovan 1761bf20fd4eSJohan Hedberg if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) 1762bf20fd4eSJohan Hedberg continue; 1763bf20fd4eSJohan Hedberg 1764bf20fd4eSJohan Hedberg if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) 1765bf20fd4eSJohan Hedberg continue; 1766bf20fd4eSJohan Hedberg 176723691d75SGustavo F. Padovan if (c->psm == psm) { 1768c2287681SIdo Yariv int src_match, dst_match; 1769c2287681SIdo Yariv int src_any, dst_any; 1770c2287681SIdo Yariv 17710a708f8fSGustavo F. Padovan /* Exact match. */ 17727eafc59eSMarcel Holtmann src_match = !bacmp(&c->src, src); 17737eafc59eSMarcel Holtmann dst_match = !bacmp(&c->dst, dst); 1774c2287681SIdo Yariv if (src_match && dst_match) { 1775a24cce14SJohan Hedberg l2cap_chan_hold(c); 1776a7567b20SJohannes Berg read_unlock(&chan_list_lock); 177723691d75SGustavo F. Padovan return c; 177823691d75SGustavo F. Padovan } 17790a708f8fSGustavo F. Padovan 17800a708f8fSGustavo F. Padovan /* Closest match */ 17817eafc59eSMarcel Holtmann src_any = !bacmp(&c->src, BDADDR_ANY); 17827eafc59eSMarcel Holtmann dst_any = !bacmp(&c->dst, BDADDR_ANY); 1783c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1784c2287681SIdo Yariv (src_any && dst_any)) 178523691d75SGustavo F. Padovan c1 = c; 17860a708f8fSGustavo F. Padovan } 17870a708f8fSGustavo F. Padovan } 17880a708f8fSGustavo F. Padovan 1789a24cce14SJohan Hedberg if (c1) 1790a24cce14SJohan Hedberg l2cap_chan_hold(c1); 1791a24cce14SJohan Hedberg 179223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 17930a708f8fSGustavo F. Padovan 179423691d75SGustavo F. Padovan return c1; 17950a708f8fSGustavo F. Padovan } 17960a708f8fSGustavo F. Padovan 1797721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 17980a708f8fSGustavo F. Padovan { 1799721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1800721c4181SGustavo F. Padovan monitor_timer.work); 18010a708f8fSGustavo F. Padovan 1802525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 18030a708f8fSGustavo F. Padovan 18046be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 18056be36555SAndrei Emeltchenko 180680909e04SMat Martineau if (!chan->conn) { 18076be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18088d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18090a708f8fSGustavo F. Padovan return; 18100a708f8fSGustavo F. Padovan } 18110a708f8fSGustavo F. Padovan 1812401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 18130a708f8fSGustavo F. Padovan 18146be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18158d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18160a708f8fSGustavo F. Padovan } 18170a708f8fSGustavo F. Padovan 1818721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 18190a708f8fSGustavo F. Padovan { 1820721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1821721c4181SGustavo F. Padovan retrans_timer.work); 18220a708f8fSGustavo F. Padovan 182349208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 18240a708f8fSGustavo F. Padovan 18256be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 18266be36555SAndrei Emeltchenko 182780909e04SMat Martineau if (!chan->conn) { 182880909e04SMat Martineau l2cap_chan_unlock(chan); 182980909e04SMat Martineau l2cap_chan_put(chan); 183080909e04SMat Martineau return; 183180909e04SMat Martineau } 18320a708f8fSGustavo F. Padovan 1833401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 18346be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18358d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18360a708f8fSGustavo F. Padovan } 18370a708f8fSGustavo F. Padovan 1838d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 18393733937dSMat Martineau struct sk_buff_head *skbs) 18400a708f8fSGustavo F. Padovan { 18410a708f8fSGustavo F. Padovan struct sk_buff *skb; 18423733937dSMat Martineau struct l2cap_ctrl *control; 18430a708f8fSGustavo F. Padovan 18443733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 18453733937dSMat Martineau 1846b99e13adSMat Martineau if (__chan_is_moving(chan)) 1847b99e13adSMat Martineau return; 1848b99e13adSMat Martineau 18493733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 18503733937dSMat Martineau 18513733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 18523733937dSMat Martineau 18533733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 18543733937dSMat Martineau 1855a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries = 1; 1856a4368ff3SJohan Hedberg control = &bt_cb(skb)->l2cap; 18573733937dSMat Martineau 18583733937dSMat Martineau control->reqseq = 0; 18593733937dSMat Martineau control->txseq = chan->next_tx_seq; 18603733937dSMat Martineau 18613733937dSMat Martineau __pack_control(chan, control, skb); 18620a708f8fSGustavo F. Padovan 186347d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 18643733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 18653733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 18660a708f8fSGustavo F. Padovan } 18670a708f8fSGustavo F. Padovan 18684343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 18690a708f8fSGustavo F. Padovan 1870b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 18713733937dSMat Martineau 1872836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 18733733937dSMat Martineau chan->frames_sent++; 18740a708f8fSGustavo F. Padovan } 18750a708f8fSGustavo F. Padovan } 18760a708f8fSGustavo F. Padovan 187767c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 18780a708f8fSGustavo F. Padovan { 18790a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 188018a48e76SMat Martineau struct l2cap_ctrl *control; 188118a48e76SMat Martineau int sent = 0; 188218a48e76SMat Martineau 188318a48e76SMat Martineau BT_DBG("chan %p", chan); 18840a708f8fSGustavo F. Padovan 188589bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 18860a708f8fSGustavo F. Padovan return -ENOTCONN; 18870a708f8fSGustavo F. Padovan 188894122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 188994122bbeSMat Martineau return 0; 189094122bbeSMat Martineau 1891b99e13adSMat Martineau if (__chan_is_moving(chan)) 1892b99e13adSMat Martineau return 0; 1893b99e13adSMat Martineau 189418a48e76SMat Martineau while (chan->tx_send_head && 189518a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 189618a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 18970a708f8fSGustavo F. Padovan 189818a48e76SMat Martineau skb = chan->tx_send_head; 18990a708f8fSGustavo F. Padovan 1900a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries = 1; 1901a4368ff3SJohan Hedberg control = &bt_cb(skb)->l2cap; 19020a708f8fSGustavo F. Padovan 1903e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 190418a48e76SMat Martineau control->final = 1; 1905e2ab4353SGustavo F. Padovan 190618a48e76SMat Martineau control->reqseq = chan->buffer_seq; 190718a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 190818a48e76SMat Martineau control->txseq = chan->next_tx_seq; 19090a708f8fSGustavo F. Padovan 191018a48e76SMat Martineau __pack_control(chan, control, skb); 19110a708f8fSGustavo F. Padovan 191247d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 191318a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 191418a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 19150a708f8fSGustavo F. Padovan } 19160a708f8fSGustavo F. Padovan 191718a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 191818a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 191918a48e76SMat Martineau */ 192018a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 192118a48e76SMat Martineau 192218a48e76SMat Martineau if (!tx_skb) 192318a48e76SMat Martineau break; 19240a708f8fSGustavo F. Padovan 19251a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 19260a708f8fSGustavo F. Padovan 1927836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 19286a026610SGustavo F. Padovan chan->unacked_frames++; 19296a026610SGustavo F. Padovan chan->frames_sent++; 193018a48e76SMat Martineau sent++; 19310a708f8fSGustavo F. Padovan 193258d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 193358d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 19340a708f8fSGustavo F. Padovan else 193558d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 193618a48e76SMat Martineau 193718a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 1938b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 19390a708f8fSGustavo F. Padovan } 19400a708f8fSGustavo F. Padovan 1941b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 1942b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 194318a48e76SMat Martineau 194418a48e76SMat Martineau return sent; 19450a708f8fSGustavo F. Padovan } 19460a708f8fSGustavo F. Padovan 1947e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 1948e1fbd4c1SMat Martineau { 1949e1fbd4c1SMat Martineau struct l2cap_ctrl control; 1950e1fbd4c1SMat Martineau struct sk_buff *skb; 1951e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 1952e1fbd4c1SMat Martineau u16 seq; 1953e1fbd4c1SMat Martineau 1954e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 1955e1fbd4c1SMat Martineau 1956e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1957e1fbd4c1SMat Martineau return; 1958e1fbd4c1SMat Martineau 1959b99e13adSMat Martineau if (__chan_is_moving(chan)) 1960b99e13adSMat Martineau return; 1961b99e13adSMat Martineau 1962e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 1963e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 1964e1fbd4c1SMat Martineau 1965e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 1966e1fbd4c1SMat Martineau if (!skb) { 1967e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 1968e1fbd4c1SMat Martineau seq); 1969e1fbd4c1SMat Martineau continue; 1970e1fbd4c1SMat Martineau } 1971e1fbd4c1SMat Martineau 1972a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries++; 1973a4368ff3SJohan Hedberg control = bt_cb(skb)->l2cap; 1974e1fbd4c1SMat Martineau 1975e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 1976a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries > chan->max_tx) { 1977e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 19785e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 1979e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1980e1fbd4c1SMat Martineau break; 1981e1fbd4c1SMat Martineau } 1982e1fbd4c1SMat Martineau 1983e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 1984e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 1985e1fbd4c1SMat Martineau control.final = 1; 1986e1fbd4c1SMat Martineau else 1987e1fbd4c1SMat Martineau control.final = 0; 1988e1fbd4c1SMat Martineau 1989e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 1990e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 1991e1fbd4c1SMat Martineau * writeable copy 1992e1fbd4c1SMat Martineau */ 19938bcde1f2SGustavo Padovan tx_skb = skb_copy(skb, GFP_KERNEL); 1994e1fbd4c1SMat Martineau } else { 19958bcde1f2SGustavo Padovan tx_skb = skb_clone(skb, GFP_KERNEL); 1996e1fbd4c1SMat Martineau } 1997e1fbd4c1SMat Martineau 1998e1fbd4c1SMat Martineau if (!tx_skb) { 1999e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2000e1fbd4c1SMat Martineau break; 2001e1fbd4c1SMat Martineau } 2002e1fbd4c1SMat Martineau 2003e1fbd4c1SMat Martineau /* Update skb contents */ 2004e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 2005e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 2006e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2007e1fbd4c1SMat Martineau } else { 2008e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 2009e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2010e1fbd4c1SMat Martineau } 2011e1fbd4c1SMat Martineau 201213cac152SLukasz Rymanowski /* Update FCS */ 2013e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 201413cac152SLukasz Rymanowski u16 fcs = crc16(0, (u8 *) tx_skb->data, 201513cac152SLukasz Rymanowski tx_skb->len - L2CAP_FCS_SIZE); 201613cac152SLukasz Rymanowski put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) - 201713cac152SLukasz Rymanowski L2CAP_FCS_SIZE); 2018e1fbd4c1SMat Martineau } 2019e1fbd4c1SMat Martineau 2020e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 2021e1fbd4c1SMat Martineau 2022e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 2023e1fbd4c1SMat Martineau 2024e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 2025e1fbd4c1SMat Martineau } 2026e1fbd4c1SMat Martineau } 2027e1fbd4c1SMat Martineau 2028f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 2029f80842a8SMat Martineau struct l2cap_ctrl *control) 2030f80842a8SMat Martineau { 2031f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2032f80842a8SMat Martineau 2033f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 2034f80842a8SMat Martineau l2cap_ertm_resend(chan); 2035f80842a8SMat Martineau } 2036f80842a8SMat Martineau 2037d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 2038d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 2039d2a7ac5dSMat Martineau { 2040e1fbd4c1SMat Martineau struct sk_buff *skb; 2041e1fbd4c1SMat Martineau 2042e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2043e1fbd4c1SMat Martineau 2044e1fbd4c1SMat Martineau if (control->poll) 2045e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 2046e1fbd4c1SMat Martineau 2047e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2048e1fbd4c1SMat Martineau 2049e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 2050e1fbd4c1SMat Martineau return; 2051e1fbd4c1SMat Martineau 2052e1fbd4c1SMat Martineau if (chan->unacked_frames) { 2053e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 2054a4368ff3SJohan Hedberg if (bt_cb(skb)->l2cap.txseq == control->reqseq || 2055e1fbd4c1SMat Martineau skb == chan->tx_send_head) 2056e1fbd4c1SMat Martineau break; 2057e1fbd4c1SMat Martineau } 2058e1fbd4c1SMat Martineau 2059e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 2060e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 2061e1fbd4c1SMat Martineau break; 2062e1fbd4c1SMat Martineau 2063e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 2064a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.txseq); 2065e1fbd4c1SMat Martineau } 2066e1fbd4c1SMat Martineau 2067e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 2068e1fbd4c1SMat Martineau } 2069d2a7ac5dSMat Martineau } 2070d2a7ac5dSMat Martineau 2071b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 2072b17e73bbSSzymon Janc { 20730a0aba42SMat Martineau struct l2cap_ctrl control; 20740a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 20750a0aba42SMat Martineau chan->last_acked_seq); 20760a0aba42SMat Martineau int threshold; 20770a0aba42SMat Martineau 20780a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 20790a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 20800a0aba42SMat Martineau 20810a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 20820a0aba42SMat Martineau control.sframe = 1; 20830a0aba42SMat Martineau 20840a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 20850a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 2086b17e73bbSSzymon Janc __clear_ack_timer(chan); 20870a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 20880a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 20890a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 20900a0aba42SMat Martineau } else { 20910a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 20920a0aba42SMat Martineau l2cap_ertm_send(chan); 20930a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 20940a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 20950a0aba42SMat Martineau frames_to_ack = 0; 20960a0aba42SMat Martineau } 20970a0aba42SMat Martineau 2098c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 20990a0aba42SMat Martineau * Calculate without mul or div 21000a0aba42SMat Martineau */ 2101c20f8e35SMat Martineau threshold = chan->ack_win; 21020a0aba42SMat Martineau threshold += threshold << 1; 21030a0aba42SMat Martineau threshold >>= 2; 21040a0aba42SMat Martineau 2105b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 21060a0aba42SMat Martineau threshold); 21070a0aba42SMat Martineau 21080a0aba42SMat Martineau if (frames_to_ack >= threshold) { 21090a0aba42SMat Martineau __clear_ack_timer(chan); 21100a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 21110a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 21120a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 21130a0aba42SMat Martineau frames_to_ack = 0; 21140a0aba42SMat Martineau } 21150a0aba42SMat Martineau 21160a0aba42SMat Martineau if (frames_to_ack) 21170a0aba42SMat Martineau __set_ack_timer(chan); 21180a0aba42SMat Martineau } 2119b17e73bbSSzymon Janc } 2120b17e73bbSSzymon Janc 212104124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 212204124681SGustavo F. Padovan struct msghdr *msg, int len, 212304124681SGustavo F. Padovan int count, struct sk_buff *skb) 21240a708f8fSGustavo F. Padovan { 21250952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 21260a708f8fSGustavo F. Padovan struct sk_buff **frag; 212790338947SGustavo Padovan int sent = 0; 21280a708f8fSGustavo F. Padovan 212917836394SAl Viro if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count) 21300a708f8fSGustavo F. Padovan return -EFAULT; 21310a708f8fSGustavo F. Padovan 21320a708f8fSGustavo F. Padovan sent += count; 21330a708f8fSGustavo F. Padovan len -= count; 21340a708f8fSGustavo F. Padovan 21350a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 21360a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 21370a708f8fSGustavo F. Padovan while (len) { 2138fbe00700SGustavo Padovan struct sk_buff *tmp; 2139fbe00700SGustavo Padovan 21400a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 21410a708f8fSGustavo F. Padovan 2142d9fbd02bSMarcel Holtmann tmp = chan->ops->alloc_skb(chan, 0, count, 214390338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 2144fbe00700SGustavo Padovan if (IS_ERR(tmp)) 2145fbe00700SGustavo Padovan return PTR_ERR(tmp); 21462f7719ceSAndrei Emeltchenko 2147fbe00700SGustavo Padovan *frag = tmp; 2148fbe00700SGustavo Padovan 214917836394SAl Viro if (copy_from_iter(skb_put(*frag, count), count, 215017836394SAl Viro &msg->msg_iter) != count) 21510a708f8fSGustavo F. Padovan return -EFAULT; 21520a708f8fSGustavo F. Padovan 21530a708f8fSGustavo F. Padovan sent += count; 21540a708f8fSGustavo F. Padovan len -= count; 21550a708f8fSGustavo F. Padovan 21562d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 21572d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 21582d0ed3d5SGustavo Padovan 21590a708f8fSGustavo F. Padovan frag = &(*frag)->next; 21600a708f8fSGustavo F. Padovan } 21610a708f8fSGustavo F. Padovan 21620a708f8fSGustavo F. Padovan return sent; 21630a708f8fSGustavo F. Padovan } 21640a708f8fSGustavo F. Padovan 21655e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 21668d46321cSMarcel Holtmann struct msghdr *msg, size_t len) 21670a708f8fSGustavo F. Padovan { 21688c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 21690a708f8fSGustavo F. Padovan struct sk_buff *skb; 217003a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 21710a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 21720a708f8fSGustavo F. Padovan 21738d46321cSMarcel Holtmann BT_DBG("chan %p psm 0x%2.2x len %zu", chan, 21748d46321cSMarcel Holtmann __le16_to_cpu(chan->psm), len); 21750a708f8fSGustavo F. Padovan 21760a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 21772f7719ceSAndrei Emeltchenko 2178d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 217990338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 218090338947SGustavo Padovan if (IS_ERR(skb)) 218190338947SGustavo Padovan return skb; 21820a708f8fSGustavo F. Padovan 21830a708f8fSGustavo F. Padovan /* Create L2CAP header */ 21840a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2185fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 2186daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 218743b1b8dfSMarcel Holtmann put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); 21880a708f8fSGustavo F. Padovan 21890952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 21900a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 21910a708f8fSGustavo F. Padovan kfree_skb(skb); 21920a708f8fSGustavo F. Padovan return ERR_PTR(err); 21930a708f8fSGustavo F. Padovan } 21940a708f8fSGustavo F. Padovan return skb; 21950a708f8fSGustavo F. Padovan } 21960a708f8fSGustavo F. Padovan 21975e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 21988d46321cSMarcel Holtmann struct msghdr *msg, size_t len) 21990a708f8fSGustavo F. Padovan { 22008c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22010a708f8fSGustavo F. Padovan struct sk_buff *skb; 2202f2ba7faeSGustavo Padovan int err, count; 22030a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22040a708f8fSGustavo F. Padovan 2205b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 22060a708f8fSGustavo F. Padovan 2207f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 22082f7719ceSAndrei Emeltchenko 2209d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, 221090338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 221190338947SGustavo Padovan if (IS_ERR(skb)) 221290338947SGustavo Padovan return skb; 22130a708f8fSGustavo F. Padovan 22140a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22150a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2216fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22176ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 22180a708f8fSGustavo F. Padovan 22190952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22200a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22210a708f8fSGustavo F. Padovan kfree_skb(skb); 22220a708f8fSGustavo F. Padovan return ERR_PTR(err); 22230a708f8fSGustavo F. Padovan } 22240a708f8fSGustavo F. Padovan return skb; 22250a708f8fSGustavo F. Padovan } 22260a708f8fSGustavo F. Padovan 2227ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2228ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 222994122bbeSMat Martineau u16 sdulen) 22300a708f8fSGustavo F. Padovan { 22318c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22320a708f8fSGustavo F. Padovan struct sk_buff *skb; 2233e4ca6d98SAndrei Emeltchenko int err, count, hlen; 22340a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22350a708f8fSGustavo F. Padovan 2236b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 22370a708f8fSGustavo F. Padovan 22380a708f8fSGustavo F. Padovan if (!conn) 22390a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 22400a708f8fSGustavo F. Padovan 2241ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2242e4ca6d98SAndrei Emeltchenko 22430a708f8fSGustavo F. Padovan if (sdulen) 224403a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 22450a708f8fSGustavo F. Padovan 224647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 224703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 22480a708f8fSGustavo F. Padovan 22490a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 22502f7719ceSAndrei Emeltchenko 2251d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 225290338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 225390338947SGustavo Padovan if (IS_ERR(skb)) 225490338947SGustavo Padovan return skb; 22550a708f8fSGustavo F. Padovan 22560a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22570a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2258fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22590a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 226088843ab0SAndrei Emeltchenko 226118a48e76SMat Martineau /* Control header is populated later */ 226218a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 226318a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 226418a48e76SMat Martineau else 226518a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 226688843ab0SAndrei Emeltchenko 22670a708f8fSGustavo F. Padovan if (sdulen) 226803a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 22690a708f8fSGustavo F. Padovan 22700952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22710a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22720a708f8fSGustavo F. Padovan kfree_skb(skb); 22730a708f8fSGustavo F. Padovan return ERR_PTR(err); 22740a708f8fSGustavo F. Padovan } 22750a708f8fSGustavo F. Padovan 2276a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.fcs = chan->fcs; 2277a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries = 0; 22780a708f8fSGustavo F. Padovan return skb; 22790a708f8fSGustavo F. Padovan } 22800a708f8fSGustavo F. Padovan 228194122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 228294122bbeSMat Martineau struct sk_buff_head *seg_queue, 228394122bbeSMat Martineau struct msghdr *msg, size_t len) 22840a708f8fSGustavo F. Padovan { 22850a708f8fSGustavo F. Padovan struct sk_buff *skb; 228694122bbeSMat Martineau u16 sdu_len; 228794122bbeSMat Martineau size_t pdu_len; 228894122bbeSMat Martineau u8 sar; 22890a708f8fSGustavo F. Padovan 2290b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 22910a708f8fSGustavo F. Padovan 229294122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 229394122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 229494122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 229594122bbeSMat Martineau */ 229694122bbeSMat Martineau 229794122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 229894122bbeSMat Martineau pdu_len = chan->conn->mtu; 229994122bbeSMat Martineau 2300a549574dSMat Martineau /* Constrain PDU size for BR/EDR connections */ 2301a549574dSMat Martineau if (!chan->hs_hcon) 230294122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 230394122bbeSMat Martineau 230494122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 230535d401dfSGustavo Padovan if (chan->fcs) 230635d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 230735d401dfSGustavo Padovan 2308ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 230994122bbeSMat Martineau 231094122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 231194122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 231294122bbeSMat Martineau 231394122bbeSMat Martineau if (len <= pdu_len) { 231494122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 231594122bbeSMat Martineau sdu_len = 0; 231694122bbeSMat Martineau pdu_len = len; 231794122bbeSMat Martineau } else { 231894122bbeSMat Martineau sar = L2CAP_SAR_START; 231994122bbeSMat Martineau sdu_len = len; 232094122bbeSMat Martineau } 23210a708f8fSGustavo F. Padovan 23220a708f8fSGustavo F. Padovan while (len > 0) { 232394122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 23240a708f8fSGustavo F. Padovan 23250a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 232694122bbeSMat Martineau __skb_queue_purge(seg_queue); 23270a708f8fSGustavo F. Padovan return PTR_ERR(skb); 23280a708f8fSGustavo F. Padovan } 23290a708f8fSGustavo F. Padovan 2330a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.sar = sar; 233194122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 23320a708f8fSGustavo F. Padovan 233394122bbeSMat Martineau len -= pdu_len; 2334069cb270SLukasz Rymanowski if (sdu_len) 233594122bbeSMat Martineau sdu_len = 0; 233694122bbeSMat Martineau 233794122bbeSMat Martineau if (len <= pdu_len) { 233894122bbeSMat Martineau sar = L2CAP_SAR_END; 233994122bbeSMat Martineau pdu_len = len; 234094122bbeSMat Martineau } else { 234194122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 234294122bbeSMat Martineau } 234394122bbeSMat Martineau } 234494122bbeSMat Martineau 2345f0f62799SGustavo Padovan return 0; 23460a708f8fSGustavo F. Padovan } 23470a708f8fSGustavo F. Padovan 2348177f8f2bSJohan Hedberg static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, 2349177f8f2bSJohan Hedberg struct msghdr *msg, 2350177f8f2bSJohan Hedberg size_t len, u16 sdulen) 2351177f8f2bSJohan Hedberg { 2352177f8f2bSJohan Hedberg struct l2cap_conn *conn = chan->conn; 2353177f8f2bSJohan Hedberg struct sk_buff *skb; 2354177f8f2bSJohan Hedberg int err, count, hlen; 2355177f8f2bSJohan Hedberg struct l2cap_hdr *lh; 2356177f8f2bSJohan Hedberg 2357177f8f2bSJohan Hedberg BT_DBG("chan %p len %zu", chan, len); 2358177f8f2bSJohan Hedberg 2359177f8f2bSJohan Hedberg if (!conn) 2360177f8f2bSJohan Hedberg return ERR_PTR(-ENOTCONN); 2361177f8f2bSJohan Hedberg 2362177f8f2bSJohan Hedberg hlen = L2CAP_HDR_SIZE; 2363177f8f2bSJohan Hedberg 2364177f8f2bSJohan Hedberg if (sdulen) 2365177f8f2bSJohan Hedberg hlen += L2CAP_SDULEN_SIZE; 2366177f8f2bSJohan Hedberg 2367177f8f2bSJohan Hedberg count = min_t(unsigned int, (conn->mtu - hlen), len); 2368177f8f2bSJohan Hedberg 2369d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 2370177f8f2bSJohan Hedberg msg->msg_flags & MSG_DONTWAIT); 2371177f8f2bSJohan Hedberg if (IS_ERR(skb)) 2372177f8f2bSJohan Hedberg return skb; 2373177f8f2bSJohan Hedberg 2374177f8f2bSJohan Hedberg /* Create L2CAP header */ 2375177f8f2bSJohan Hedberg lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2376177f8f2bSJohan Hedberg lh->cid = cpu_to_le16(chan->dcid); 2377177f8f2bSJohan Hedberg lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 2378177f8f2bSJohan Hedberg 2379177f8f2bSJohan Hedberg if (sdulen) 2380177f8f2bSJohan Hedberg put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 2381177f8f2bSJohan Hedberg 2382177f8f2bSJohan Hedberg err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 2383177f8f2bSJohan Hedberg if (unlikely(err < 0)) { 2384177f8f2bSJohan Hedberg kfree_skb(skb); 2385177f8f2bSJohan Hedberg return ERR_PTR(err); 2386177f8f2bSJohan Hedberg } 2387177f8f2bSJohan Hedberg 2388177f8f2bSJohan Hedberg return skb; 2389177f8f2bSJohan Hedberg } 2390177f8f2bSJohan Hedberg 2391177f8f2bSJohan Hedberg static int l2cap_segment_le_sdu(struct l2cap_chan *chan, 2392177f8f2bSJohan Hedberg struct sk_buff_head *seg_queue, 2393177f8f2bSJohan Hedberg struct msghdr *msg, size_t len) 2394177f8f2bSJohan Hedberg { 2395177f8f2bSJohan Hedberg struct sk_buff *skb; 2396177f8f2bSJohan Hedberg size_t pdu_len; 2397177f8f2bSJohan Hedberg u16 sdu_len; 2398177f8f2bSJohan Hedberg 2399177f8f2bSJohan Hedberg BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 2400177f8f2bSJohan Hedberg 2401177f8f2bSJohan Hedberg sdu_len = len; 240272c6fb91SJohan Hedberg pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE; 2403177f8f2bSJohan Hedberg 2404177f8f2bSJohan Hedberg while (len > 0) { 2405177f8f2bSJohan Hedberg if (len <= pdu_len) 2406177f8f2bSJohan Hedberg pdu_len = len; 2407177f8f2bSJohan Hedberg 2408177f8f2bSJohan Hedberg skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); 2409177f8f2bSJohan Hedberg if (IS_ERR(skb)) { 2410177f8f2bSJohan Hedberg __skb_queue_purge(seg_queue); 2411177f8f2bSJohan Hedberg return PTR_ERR(skb); 2412177f8f2bSJohan Hedberg } 2413177f8f2bSJohan Hedberg 2414177f8f2bSJohan Hedberg __skb_queue_tail(seg_queue, skb); 2415177f8f2bSJohan Hedberg 2416177f8f2bSJohan Hedberg len -= pdu_len; 2417177f8f2bSJohan Hedberg 2418177f8f2bSJohan Hedberg if (sdu_len) { 2419177f8f2bSJohan Hedberg sdu_len = 0; 2420177f8f2bSJohan Hedberg pdu_len += L2CAP_SDULEN_SIZE; 2421177f8f2bSJohan Hedberg } 2422177f8f2bSJohan Hedberg } 2423177f8f2bSJohan Hedberg 2424177f8f2bSJohan Hedberg return 0; 2425177f8f2bSJohan Hedberg } 2426177f8f2bSJohan Hedberg 24278d46321cSMarcel Holtmann int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 24289a91a04aSGustavo F. Padovan { 24299a91a04aSGustavo F. Padovan struct sk_buff *skb; 24309a91a04aSGustavo F. Padovan int err; 243194122bbeSMat Martineau struct sk_buff_head seg_queue; 24329a91a04aSGustavo F. Padovan 243331e8ce80SSeung-Woo Kim if (!chan->conn) 243431e8ce80SSeung-Woo Kim return -ENOTCONN; 243531e8ce80SSeung-Woo Kim 24369a91a04aSGustavo F. Padovan /* Connectionless channel */ 2437715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 24388d46321cSMarcel Holtmann skb = l2cap_create_connless_pdu(chan, msg, len); 24399a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 24409a91a04aSGustavo F. Padovan return PTR_ERR(skb); 24419a91a04aSGustavo F. Padovan 2442ede81a2aSAndrzej Kaczmarek /* Channel lock is released before requesting new skb and then 2443ede81a2aSAndrzej Kaczmarek * reacquired thus we need to recheck channel state. 2444ede81a2aSAndrzej Kaczmarek */ 2445ede81a2aSAndrzej Kaczmarek if (chan->state != BT_CONNECTED) { 2446ede81a2aSAndrzej Kaczmarek kfree_skb(skb); 2447ede81a2aSAndrzej Kaczmarek return -ENOTCONN; 2448ede81a2aSAndrzej Kaczmarek } 2449ede81a2aSAndrzej Kaczmarek 24509a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 24519a91a04aSGustavo F. Padovan return len; 24529a91a04aSGustavo F. Padovan } 24539a91a04aSGustavo F. Padovan 24549a91a04aSGustavo F. Padovan switch (chan->mode) { 245538319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 2456177f8f2bSJohan Hedberg /* Check outgoing MTU */ 2457177f8f2bSJohan Hedberg if (len > chan->omtu) 2458177f8f2bSJohan Hedberg return -EMSGSIZE; 2459177f8f2bSJohan Hedberg 2460fad5fc89SJohan Hedberg if (!chan->tx_credits) 2461fad5fc89SJohan Hedberg return -EAGAIN; 2462fad5fc89SJohan Hedberg 2463177f8f2bSJohan Hedberg __skb_queue_head_init(&seg_queue); 2464177f8f2bSJohan Hedberg 2465177f8f2bSJohan Hedberg err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); 2466177f8f2bSJohan Hedberg 2467177f8f2bSJohan Hedberg if (chan->state != BT_CONNECTED) { 2468177f8f2bSJohan Hedberg __skb_queue_purge(&seg_queue); 2469177f8f2bSJohan Hedberg err = -ENOTCONN; 2470177f8f2bSJohan Hedberg } 2471177f8f2bSJohan Hedberg 2472177f8f2bSJohan Hedberg if (err) 2473177f8f2bSJohan Hedberg return err; 2474177f8f2bSJohan Hedberg 2475177f8f2bSJohan Hedberg skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); 2476177f8f2bSJohan Hedberg 2477177f8f2bSJohan Hedberg while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { 2478177f8f2bSJohan Hedberg l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); 2479177f8f2bSJohan Hedberg chan->tx_credits--; 2480177f8f2bSJohan Hedberg } 2481177f8f2bSJohan Hedberg 2482177f8f2bSJohan Hedberg if (!chan->tx_credits) 2483177f8f2bSJohan Hedberg chan->ops->suspend(chan); 2484177f8f2bSJohan Hedberg 2485177f8f2bSJohan Hedberg err = len; 2486177f8f2bSJohan Hedberg 2487177f8f2bSJohan Hedberg break; 2488177f8f2bSJohan Hedberg 2489fad5fc89SJohan Hedberg case L2CAP_MODE_BASIC: 24909a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 24919a91a04aSGustavo F. Padovan if (len > chan->omtu) 24929a91a04aSGustavo F. Padovan return -EMSGSIZE; 24939a91a04aSGustavo F. Padovan 24949a91a04aSGustavo F. Padovan /* Create a basic PDU */ 24958d46321cSMarcel Holtmann skb = l2cap_create_basic_pdu(chan, msg, len); 24969a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 24979a91a04aSGustavo F. Padovan return PTR_ERR(skb); 24989a91a04aSGustavo F. Padovan 2499ede81a2aSAndrzej Kaczmarek /* Channel lock is released before requesting new skb and then 2500ede81a2aSAndrzej Kaczmarek * reacquired thus we need to recheck channel state. 2501ede81a2aSAndrzej Kaczmarek */ 2502ede81a2aSAndrzej Kaczmarek if (chan->state != BT_CONNECTED) { 2503ede81a2aSAndrzej Kaczmarek kfree_skb(skb); 2504ede81a2aSAndrzej Kaczmarek return -ENOTCONN; 2505ede81a2aSAndrzej Kaczmarek } 2506ede81a2aSAndrzej Kaczmarek 25079a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 25089a91a04aSGustavo F. Padovan err = len; 25099a91a04aSGustavo F. Padovan break; 25109a91a04aSGustavo F. Padovan 25119a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 25129a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 251394122bbeSMat Martineau /* Check outgoing MTU */ 251494122bbeSMat Martineau if (len > chan->omtu) { 251594122bbeSMat Martineau err = -EMSGSIZE; 25169a91a04aSGustavo F. Padovan break; 25179a91a04aSGustavo F. Padovan } 25189a91a04aSGustavo F. Padovan 251994122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 252094122bbeSMat Martineau 252194122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 252294122bbeSMat Martineau * since it's possible to block while waiting for memory 252394122bbeSMat Martineau * allocation. 252494122bbeSMat Martineau */ 252594122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 252694122bbeSMat Martineau 252794122bbeSMat Martineau /* The channel could have been closed while segmenting, 252894122bbeSMat Martineau * check that it is still connected. 252994122bbeSMat Martineau */ 253094122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 253194122bbeSMat Martineau __skb_queue_purge(&seg_queue); 253294122bbeSMat Martineau err = -ENOTCONN; 25339a91a04aSGustavo F. Padovan } 25349a91a04aSGustavo F. Padovan 253594122bbeSMat Martineau if (err) 253694122bbeSMat Martineau break; 253794122bbeSMat Martineau 25383733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2539d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 25403733937dSMat Martineau else 2541d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 254294122bbeSMat Martineau 25439a91a04aSGustavo F. Padovan err = len; 25449a91a04aSGustavo F. Padovan 254594122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 254694122bbeSMat Martineau * seg_queue and need to be purged. 254794122bbeSMat Martineau */ 254894122bbeSMat Martineau __skb_queue_purge(&seg_queue); 25499a91a04aSGustavo F. Padovan break; 25509a91a04aSGustavo F. Padovan 25519a91a04aSGustavo F. Padovan default: 25529a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 25539a91a04aSGustavo F. Padovan err = -EBADFD; 25549a91a04aSGustavo F. Padovan } 25559a91a04aSGustavo F. Padovan 25569a91a04aSGustavo F. Padovan return err; 25579a91a04aSGustavo F. Padovan } 25586b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_send); 25599a91a04aSGustavo F. Padovan 2560d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2561d2a7ac5dSMat Martineau { 2562bed68bdeSMat Martineau struct l2cap_ctrl control; 2563bed68bdeSMat Martineau u16 seq; 2564bed68bdeSMat Martineau 2565b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2566bed68bdeSMat Martineau 2567bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2568bed68bdeSMat Martineau control.sframe = 1; 2569bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2570bed68bdeSMat Martineau 2571bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2572bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2573bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2574bed68bdeSMat Martineau control.reqseq = seq; 2575bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2576bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2577bed68bdeSMat Martineau } 2578bed68bdeSMat Martineau } 2579bed68bdeSMat Martineau 2580bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2581d2a7ac5dSMat Martineau } 2582d2a7ac5dSMat Martineau 2583d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2584d2a7ac5dSMat Martineau { 2585bed68bdeSMat Martineau struct l2cap_ctrl control; 2586bed68bdeSMat Martineau 2587bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2588bed68bdeSMat Martineau 2589bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2590bed68bdeSMat Martineau return; 2591bed68bdeSMat Martineau 2592bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2593bed68bdeSMat Martineau control.sframe = 1; 2594bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2595bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2596bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2597d2a7ac5dSMat Martineau } 2598d2a7ac5dSMat Martineau 2599d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2600d2a7ac5dSMat Martineau { 2601bed68bdeSMat Martineau struct l2cap_ctrl control; 2602bed68bdeSMat Martineau u16 initial_head; 2603bed68bdeSMat Martineau u16 seq; 2604bed68bdeSMat Martineau 2605b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2606bed68bdeSMat Martineau 2607bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2608bed68bdeSMat Martineau control.sframe = 1; 2609bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2610bed68bdeSMat Martineau 2611bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2612bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2613bed68bdeSMat Martineau 2614bed68bdeSMat Martineau do { 2615bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2616bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2617bed68bdeSMat Martineau break; 2618bed68bdeSMat Martineau 2619bed68bdeSMat Martineau control.reqseq = seq; 2620bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2621bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2622bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2623d2a7ac5dSMat Martineau } 2624d2a7ac5dSMat Martineau 2625608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2626608bcc6dSMat Martineau { 2627608bcc6dSMat Martineau struct sk_buff *acked_skb; 2628608bcc6dSMat Martineau u16 ackseq; 2629608bcc6dSMat Martineau 2630b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2631608bcc6dSMat Martineau 2632608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2633608bcc6dSMat Martineau return; 2634608bcc6dSMat Martineau 2635b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2636608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2637608bcc6dSMat Martineau 2638608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2639608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2640608bcc6dSMat Martineau 2641608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2642608bcc6dSMat Martineau if (acked_skb) { 2643608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2644608bcc6dSMat Martineau kfree_skb(acked_skb); 2645608bcc6dSMat Martineau chan->unacked_frames--; 2646608bcc6dSMat Martineau } 2647608bcc6dSMat Martineau } 2648608bcc6dSMat Martineau 2649608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2650608bcc6dSMat Martineau 2651608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2652608bcc6dSMat Martineau __clear_retrans_timer(chan); 2653608bcc6dSMat Martineau 2654b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2655608bcc6dSMat Martineau } 2656608bcc6dSMat Martineau 2657608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2658608bcc6dSMat Martineau { 2659608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2660608bcc6dSMat Martineau 2661608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2662608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2663608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2664608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2665608bcc6dSMat Martineau } 2666608bcc6dSMat Martineau 2667d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2668608bcc6dSMat Martineau struct l2cap_ctrl *control, 2669608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2670608bcc6dSMat Martineau { 2671608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2672608bcc6dSMat Martineau event); 2673608bcc6dSMat Martineau 2674608bcc6dSMat Martineau switch (event) { 2675608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2676608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2677608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2678608bcc6dSMat Martineau 2679608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2680608bcc6dSMat Martineau l2cap_ertm_send(chan); 2681608bcc6dSMat Martineau break; 2682608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2683608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2684608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2685608bcc6dSMat Martineau 2686608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2687608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2688608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2689608bcc6dSMat Martineau */ 2690608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2691608bcc6dSMat Martineau } 2692608bcc6dSMat Martineau 2693608bcc6dSMat Martineau l2cap_send_ack(chan); 2694608bcc6dSMat Martineau 2695608bcc6dSMat Martineau break; 2696608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2697608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2698608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2699608bcc6dSMat Martineau 2700608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2701608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2702608bcc6dSMat Martineau 2703608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2704608bcc6dSMat Martineau local_control.sframe = 1; 2705608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2706608bcc6dSMat Martineau local_control.poll = 1; 2707608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2708a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2709608bcc6dSMat Martineau 2710608bcc6dSMat Martineau chan->retry_count = 1; 2711608bcc6dSMat Martineau __set_monitor_timer(chan); 2712608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2713608bcc6dSMat Martineau } 2714608bcc6dSMat Martineau break; 2715608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2716608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2717608bcc6dSMat Martineau break; 2718608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2719608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2720608bcc6dSMat Martineau chan->retry_count = 1; 2721608bcc6dSMat Martineau __set_monitor_timer(chan); 2722608bcc6dSMat Martineau __clear_ack_timer(chan); 2723608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2724608bcc6dSMat Martineau break; 2725608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2726608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2727608bcc6dSMat Martineau chan->retry_count = 1; 2728608bcc6dSMat Martineau __set_monitor_timer(chan); 2729608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2730608bcc6dSMat Martineau break; 2731608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2732608bcc6dSMat Martineau /* Nothing to process */ 2733608bcc6dSMat Martineau break; 2734608bcc6dSMat Martineau default: 2735608bcc6dSMat Martineau break; 2736608bcc6dSMat Martineau } 2737608bcc6dSMat Martineau } 2738608bcc6dSMat Martineau 2739d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2740608bcc6dSMat Martineau struct l2cap_ctrl *control, 2741608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2742608bcc6dSMat Martineau { 2743608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2744608bcc6dSMat Martineau event); 2745608bcc6dSMat Martineau 2746608bcc6dSMat Martineau switch (event) { 2747608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2748608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2749608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2750608bcc6dSMat Martineau /* Queue data, but don't send. */ 2751608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2752608bcc6dSMat Martineau break; 2753608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2754608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2755608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2756608bcc6dSMat Martineau 2757608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2758608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2759608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2760608bcc6dSMat Martineau */ 2761608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2762608bcc6dSMat Martineau } 2763608bcc6dSMat Martineau 2764608bcc6dSMat Martineau l2cap_send_ack(chan); 2765608bcc6dSMat Martineau 2766608bcc6dSMat Martineau break; 2767608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2768608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2769608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2770608bcc6dSMat Martineau 2771608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2772608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2773608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2774608bcc6dSMat Martineau local_control.sframe = 1; 2775608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2776608bcc6dSMat Martineau local_control.poll = 1; 2777608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2778a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2779608bcc6dSMat Martineau 2780608bcc6dSMat Martineau chan->retry_count = 1; 2781608bcc6dSMat Martineau __set_monitor_timer(chan); 2782608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2783608bcc6dSMat Martineau } 2784608bcc6dSMat Martineau break; 2785608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2786608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2787608bcc6dSMat Martineau 2788608bcc6dSMat Martineau /* Fall through */ 2789608bcc6dSMat Martineau 2790608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2791608bcc6dSMat Martineau if (control && control->final) { 2792608bcc6dSMat Martineau __clear_monitor_timer(chan); 2793608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2794608bcc6dSMat Martineau __set_retrans_timer(chan); 2795608bcc6dSMat Martineau chan->retry_count = 0; 2796608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2797608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2798608bcc6dSMat Martineau } 2799608bcc6dSMat Martineau break; 2800608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2801608bcc6dSMat Martineau /* Ignore */ 2802608bcc6dSMat Martineau break; 2803608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2804608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2805608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2806608bcc6dSMat Martineau __set_monitor_timer(chan); 2807608bcc6dSMat Martineau chan->retry_count++; 2808608bcc6dSMat Martineau } else { 28095e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNABORTED); 2810608bcc6dSMat Martineau } 2811608bcc6dSMat Martineau break; 2812608bcc6dSMat Martineau default: 2813608bcc6dSMat Martineau break; 2814608bcc6dSMat Martineau } 2815608bcc6dSMat Martineau } 2816608bcc6dSMat Martineau 2817d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2818608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2819608bcc6dSMat Martineau { 2820608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2821608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2822608bcc6dSMat Martineau 2823608bcc6dSMat Martineau switch (chan->tx_state) { 2824608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2825d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2826608bcc6dSMat Martineau break; 2827608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2828d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2829608bcc6dSMat Martineau break; 2830608bcc6dSMat Martineau default: 2831608bcc6dSMat Martineau /* Ignore event */ 2832608bcc6dSMat Martineau break; 2833608bcc6dSMat Martineau } 2834608bcc6dSMat Martineau } 2835608bcc6dSMat Martineau 28364b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 28374b51dae9SMat Martineau struct l2cap_ctrl *control) 28384b51dae9SMat Martineau { 28394b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2840401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 28414b51dae9SMat Martineau } 28424b51dae9SMat Martineau 2843f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2844f80842a8SMat Martineau struct l2cap_ctrl *control) 2845f80842a8SMat Martineau { 2846f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2847401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2848f80842a8SMat Martineau } 2849f80842a8SMat Martineau 28500a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 28510a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 28520a708f8fSGustavo F. Padovan { 28530a708f8fSGustavo F. Padovan struct sk_buff *nskb; 285448454079SGustavo F. Padovan struct l2cap_chan *chan; 28550a708f8fSGustavo F. Padovan 28560a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 28570a708f8fSGustavo F. Padovan 28583df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 28593d57dc68SGustavo F. Padovan 28603df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 2861715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 28620a708f8fSGustavo F. Padovan continue; 28630a708f8fSGustavo F. Padovan 28647f5396a7SGustavo Padovan /* Don't send frame to the channel it came from */ 2865a4368ff3SJohan Hedberg if (bt_cb(skb)->l2cap.chan == chan) 28660a708f8fSGustavo F. Padovan continue; 28677f5396a7SGustavo Padovan 28688bcde1f2SGustavo Padovan nskb = skb_clone(skb, GFP_KERNEL); 28690a708f8fSGustavo F. Padovan if (!nskb) 28700a708f8fSGustavo F. Padovan continue; 287180b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 28720a708f8fSGustavo F. Padovan kfree_skb(nskb); 28730a708f8fSGustavo F. Padovan } 28743d57dc68SGustavo F. Padovan 28753df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 28760a708f8fSGustavo F. Padovan } 28770a708f8fSGustavo F. Padovan 28780a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2879b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2880b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 28810a708f8fSGustavo F. Padovan { 28820a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 28830a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 28840a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 28850a708f8fSGustavo F. Padovan int len, count; 28860a708f8fSGustavo F. Padovan 2887b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 28880a708f8fSGustavo F. Padovan conn, code, ident, dlen); 28890a708f8fSGustavo F. Padovan 2890300b962eSAnderson Lizardo if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) 2891300b962eSAnderson Lizardo return NULL; 2892300b962eSAnderson Lizardo 28930a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 28940a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 28950a708f8fSGustavo F. Padovan 28968bcde1f2SGustavo Padovan skb = bt_skb_alloc(count, GFP_KERNEL); 28970a708f8fSGustavo F. Padovan if (!skb) 28980a708f8fSGustavo F. Padovan return NULL; 28990a708f8fSGustavo F. Padovan 29000a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 29010a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 29023300d9a9SClaudio Takahasi 29033300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2904dcf4adbfSJoe Perches lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 29053300d9a9SClaudio Takahasi else 2906dcf4adbfSJoe Perches lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 29070a708f8fSGustavo F. Padovan 29080a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 29090a708f8fSGustavo F. Padovan cmd->code = code; 29100a708f8fSGustavo F. Padovan cmd->ident = ident; 29110a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 29120a708f8fSGustavo F. Padovan 29130a708f8fSGustavo F. Padovan if (dlen) { 29140a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 29150a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 29160a708f8fSGustavo F. Padovan data += count; 29170a708f8fSGustavo F. Padovan } 29180a708f8fSGustavo F. Padovan 29190a708f8fSGustavo F. Padovan len -= skb->len; 29200a708f8fSGustavo F. Padovan 29210a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 29220a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 29230a708f8fSGustavo F. Padovan while (len) { 29240a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 29250a708f8fSGustavo F. Padovan 29268bcde1f2SGustavo Padovan *frag = bt_skb_alloc(count, GFP_KERNEL); 29270a708f8fSGustavo F. Padovan if (!*frag) 29280a708f8fSGustavo F. Padovan goto fail; 29290a708f8fSGustavo F. Padovan 29300a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 29310a708f8fSGustavo F. Padovan 29320a708f8fSGustavo F. Padovan len -= count; 29330a708f8fSGustavo F. Padovan data += count; 29340a708f8fSGustavo F. Padovan 29350a708f8fSGustavo F. Padovan frag = &(*frag)->next; 29360a708f8fSGustavo F. Padovan } 29370a708f8fSGustavo F. Padovan 29380a708f8fSGustavo F. Padovan return skb; 29390a708f8fSGustavo F. Padovan 29400a708f8fSGustavo F. Padovan fail: 29410a708f8fSGustavo F. Padovan kfree_skb(skb); 29420a708f8fSGustavo F. Padovan return NULL; 29430a708f8fSGustavo F. Padovan } 29440a708f8fSGustavo F. Padovan 29452d792818SGustavo Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, 29462d792818SGustavo Padovan unsigned long *val) 29470a708f8fSGustavo F. Padovan { 29480a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 29490a708f8fSGustavo F. Padovan int len; 29500a708f8fSGustavo F. Padovan 29510a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 29520a708f8fSGustavo F. Padovan *ptr += len; 29530a708f8fSGustavo F. Padovan 29540a708f8fSGustavo F. Padovan *type = opt->type; 29550a708f8fSGustavo F. Padovan *olen = opt->len; 29560a708f8fSGustavo F. Padovan 29570a708f8fSGustavo F. Padovan switch (opt->len) { 29580a708f8fSGustavo F. Padovan case 1: 29590a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 29600a708f8fSGustavo F. Padovan break; 29610a708f8fSGustavo F. Padovan 29620a708f8fSGustavo F. Padovan case 2: 29630a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 29640a708f8fSGustavo F. Padovan break; 29650a708f8fSGustavo F. Padovan 29660a708f8fSGustavo F. Padovan case 4: 29670a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 29680a708f8fSGustavo F. Padovan break; 29690a708f8fSGustavo F. Padovan 29700a708f8fSGustavo F. Padovan default: 29710a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 29720a708f8fSGustavo F. Padovan break; 29730a708f8fSGustavo F. Padovan } 29740a708f8fSGustavo F. Padovan 2975b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 29760a708f8fSGustavo F. Padovan return len; 29770a708f8fSGustavo F. Padovan } 29780a708f8fSGustavo F. Padovan 29790a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 29800a708f8fSGustavo F. Padovan { 29810a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 29820a708f8fSGustavo F. Padovan 2983b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 29840a708f8fSGustavo F. Padovan 29850a708f8fSGustavo F. Padovan opt->type = type; 29860a708f8fSGustavo F. Padovan opt->len = len; 29870a708f8fSGustavo F. Padovan 29880a708f8fSGustavo F. Padovan switch (len) { 29890a708f8fSGustavo F. Padovan case 1: 29900a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 29910a708f8fSGustavo F. Padovan break; 29920a708f8fSGustavo F. Padovan 29930a708f8fSGustavo F. Padovan case 2: 29940a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 29950a708f8fSGustavo F. Padovan break; 29960a708f8fSGustavo F. Padovan 29970a708f8fSGustavo F. Padovan case 4: 29980a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 29990a708f8fSGustavo F. Padovan break; 30000a708f8fSGustavo F. Padovan 30010a708f8fSGustavo F. Padovan default: 30020a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 30030a708f8fSGustavo F. Padovan break; 30040a708f8fSGustavo F. Padovan } 30050a708f8fSGustavo F. Padovan 30060a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 30070a708f8fSGustavo F. Padovan } 30080a708f8fSGustavo F. Padovan 3009f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 3010f89cef09SAndrei Emeltchenko { 3011f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 3012f89cef09SAndrei Emeltchenko 3013f89cef09SAndrei Emeltchenko switch (chan->mode) { 3014f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 3015f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 3016f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 3017f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 3018f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 3019dcf4adbfSJoe Perches efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 3020dcf4adbfSJoe Perches efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); 3021f89cef09SAndrei Emeltchenko break; 3022f89cef09SAndrei Emeltchenko 3023f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 3024f89cef09SAndrei Emeltchenko efs.id = 1; 3025f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 3026f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 3027f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 3028f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 3029f89cef09SAndrei Emeltchenko efs.flush_to = 0; 3030f89cef09SAndrei Emeltchenko break; 3031f89cef09SAndrei Emeltchenko 3032f89cef09SAndrei Emeltchenko default: 3033f89cef09SAndrei Emeltchenko return; 3034f89cef09SAndrei Emeltchenko } 3035f89cef09SAndrei Emeltchenko 3036f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 3037f89cef09SAndrei Emeltchenko (unsigned long) &efs); 3038f89cef09SAndrei Emeltchenko } 3039f89cef09SAndrei Emeltchenko 3040721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 30410a708f8fSGustavo F. Padovan { 3042721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 3043721c4181SGustavo F. Padovan ack_timer.work); 30440362520bSMat Martineau u16 frames_to_ack; 30450a708f8fSGustavo F. Padovan 30462fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 30472fb9b3d4SGustavo F. Padovan 30486be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 30496be36555SAndrei Emeltchenko 30500362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 30510362520bSMat Martineau chan->last_acked_seq); 30520362520bSMat Martineau 30530362520bSMat Martineau if (frames_to_ack) 30540362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 30556be36555SAndrei Emeltchenko 30566be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 305709bfb2eeSSzymon Janc l2cap_chan_put(chan); 30580a708f8fSGustavo F. Padovan } 30590a708f8fSGustavo F. Padovan 3060466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 30610a708f8fSGustavo F. Padovan { 30623c588192SMat Martineau int err; 30633c588192SMat Martineau 3064105bdf9eSMat Martineau chan->next_tx_seq = 0; 3065105bdf9eSMat Martineau chan->expected_tx_seq = 0; 306642e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 30676a026610SGustavo F. Padovan chan->unacked_frames = 0; 306842e5c802SGustavo F. Padovan chan->buffer_seq = 0; 30696a026610SGustavo F. Padovan chan->frames_sent = 0; 3070105bdf9eSMat Martineau chan->last_acked_seq = 0; 3071105bdf9eSMat Martineau chan->sdu = NULL; 3072105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 3073105bdf9eSMat Martineau chan->sdu_len = 0; 3074105bdf9eSMat Martineau 3075d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 3076d34c34fbSMat Martineau 30776ed971caSMarcel Holtmann chan->local_amp_id = AMP_ID_BREDR; 30786ed971caSMarcel Holtmann chan->move_id = AMP_ID_BREDR; 307908333283SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 308008333283SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 308108333283SMat Martineau 3082105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 3083105bdf9eSMat Martineau return 0; 3084105bdf9eSMat Martineau 3085105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 3086105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 30870a708f8fSGustavo F. Padovan 3088721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 3089721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 3090721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 30910a708f8fSGustavo F. Padovan 3092f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 30930a708f8fSGustavo F. Padovan 30943c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 30953c588192SMat Martineau if (err < 0) 30963c588192SMat Martineau return err; 30973c588192SMat Martineau 30989dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 30999dc9affcSMat Martineau if (err < 0) 31009dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 31019dc9affcSMat Martineau 31029dc9affcSMat Martineau return err; 31030a708f8fSGustavo F. Padovan } 31040a708f8fSGustavo F. Padovan 31050a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 31060a708f8fSGustavo F. Padovan { 31070a708f8fSGustavo F. Padovan switch (mode) { 31080a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 31090a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 31100a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 31110a708f8fSGustavo F. Padovan return mode; 31120a708f8fSGustavo F. Padovan /* fall through */ 31130a708f8fSGustavo F. Padovan default: 31140a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 31150a708f8fSGustavo F. Padovan } 31160a708f8fSGustavo F. Padovan } 31170a708f8fSGustavo F. Padovan 3118848566b3SMarcel Holtmann static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) 31196327eb98SAndrei Emeltchenko { 31200bd49fc7SJohan Hedberg return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && 31210bd49fc7SJohan Hedberg (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW)); 31226327eb98SAndrei Emeltchenko } 31236327eb98SAndrei Emeltchenko 3124848566b3SMarcel Holtmann static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) 3125f89cef09SAndrei Emeltchenko { 31260bd49fc7SJohan Hedberg return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && 31270bd49fc7SJohan Hedberg (conn->feat_mask & L2CAP_FEAT_EXT_FLOW)); 3128f89cef09SAndrei Emeltchenko } 3129f89cef09SAndrei Emeltchenko 313036c86c85SMat Martineau static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, 313136c86c85SMat Martineau struct l2cap_conf_rfc *rfc) 313236c86c85SMat Martineau { 31336ed971caSMarcel Holtmann if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { 313436c86c85SMat Martineau u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; 313536c86c85SMat Martineau 313636c86c85SMat Martineau /* Class 1 devices have must have ERTM timeouts 313736c86c85SMat Martineau * exceeding the Link Supervision Timeout. The 313836c86c85SMat Martineau * default Link Supervision Timeout for AMP 313936c86c85SMat Martineau * controllers is 10 seconds. 314036c86c85SMat Martineau * 314136c86c85SMat Martineau * Class 1 devices use 0xffffffff for their 314236c86c85SMat Martineau * best-effort flush timeout, so the clamping logic 314336c86c85SMat Martineau * will result in a timeout that meets the above 314436c86c85SMat Martineau * requirement. ERTM timeouts are 16-bit values, so 314536c86c85SMat Martineau * the maximum timeout is 65.535 seconds. 314636c86c85SMat Martineau */ 314736c86c85SMat Martineau 314836c86c85SMat Martineau /* Convert timeout to milliseconds and round */ 314936c86c85SMat Martineau ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); 315036c86c85SMat Martineau 315136c86c85SMat Martineau /* This is the recommended formula for class 2 devices 315236c86c85SMat Martineau * that start ERTM timers when packets are sent to the 315336c86c85SMat Martineau * controller. 315436c86c85SMat Martineau */ 315536c86c85SMat Martineau ertm_to = 3 * ertm_to + 500; 315636c86c85SMat Martineau 315736c86c85SMat Martineau if (ertm_to > 0xffff) 315836c86c85SMat Martineau ertm_to = 0xffff; 315936c86c85SMat Martineau 316036c86c85SMat Martineau rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); 316136c86c85SMat Martineau rfc->monitor_timeout = rfc->retrans_timeout; 316236c86c85SMat Martineau } else { 3163dcf4adbfSJoe Perches rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 3164dcf4adbfSJoe Perches rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 316536c86c85SMat Martineau } 316636c86c85SMat Martineau } 316736c86c85SMat Martineau 31686327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 31696327eb98SAndrei Emeltchenko { 31706327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 3171848566b3SMarcel Holtmann __l2cap_ews_supported(chan->conn)) { 31726327eb98SAndrei Emeltchenko /* use extended control field */ 31736327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 3174836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 3175836be934SAndrei Emeltchenko } else { 31766327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 31776327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 3178836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 3179836be934SAndrei Emeltchenko } 3180c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 31816327eb98SAndrei Emeltchenko } 31826327eb98SAndrei Emeltchenko 3183710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 31840a708f8fSGustavo F. Padovan { 31850a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 31860c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 31870a708f8fSGustavo F. Padovan void *ptr = req->data; 3188c8f79162SAndrei Emeltchenko u16 size; 31890a708f8fSGustavo F. Padovan 319049208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 31910a708f8fSGustavo F. Padovan 319273ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 31930a708f8fSGustavo F. Padovan goto done; 31940a708f8fSGustavo F. Padovan 31950c1bc5c6SGustavo F. Padovan switch (chan->mode) { 31960a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 31970a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3198c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 31990a708f8fSGustavo F. Padovan break; 32000a708f8fSGustavo F. Padovan 3201848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 3202f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 3203f89cef09SAndrei Emeltchenko 32040a708f8fSGustavo F. Padovan /* fall through */ 32050a708f8fSGustavo F. Padovan default: 32068c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 32070a708f8fSGustavo F. Padovan break; 32080a708f8fSGustavo F. Padovan } 32090a708f8fSGustavo F. Padovan 32100a708f8fSGustavo F. Padovan done: 32110c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 32120c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 32130a708f8fSGustavo F. Padovan 32140c1bc5c6SGustavo F. Padovan switch (chan->mode) { 32150a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 32166fea7ad1SMarcel Holtmann if (disable_ertm) 32176fea7ad1SMarcel Holtmann break; 32186fea7ad1SMarcel Holtmann 32198c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 32208c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 32210a708f8fSGustavo F. Padovan break; 32220a708f8fSGustavo F. Padovan 32230a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 32240a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 32250a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 32260a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 32270a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 32280a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 32290a708f8fSGustavo F. Padovan 32300a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32310a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32320a708f8fSGustavo F. Padovan break; 32330a708f8fSGustavo F. Padovan 32340a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 32350a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 323647d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 323736c86c85SMat Martineau 323836c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 3239c8f79162SAndrei Emeltchenko 3240c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32412d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3242c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3243c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32440a708f8fSGustavo F. Padovan 32456327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 32466327eb98SAndrei Emeltchenko 32476327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 32486327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 32490a708f8fSGustavo F. Padovan 32500a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32510a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32520a708f8fSGustavo F. Padovan 3253f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3254f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3255f89cef09SAndrei Emeltchenko 32566327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 32576327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 32586327eb98SAndrei Emeltchenko chan->tx_win); 325960918918SAndrei Emeltchenko 326060918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 326160918918SAndrei Emeltchenko if (chan->fcs == L2CAP_FCS_NONE || 3262f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 326360918918SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 326460918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 326560918918SAndrei Emeltchenko chan->fcs); 326660918918SAndrei Emeltchenko } 32670a708f8fSGustavo F. Padovan break; 32680a708f8fSGustavo F. Padovan 32690a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3270273759e2SMat Martineau l2cap_txwin_setup(chan); 32710a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 32720a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 32730a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 32740a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 32750a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 3276c8f79162SAndrei Emeltchenko 3277c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32782d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3279c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3280c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32810a708f8fSGustavo F. Padovan 32820a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32830a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32840a708f8fSGustavo F. Padovan 3285f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3286f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3287f89cef09SAndrei Emeltchenko 328860918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 328947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 3290f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 329147d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 329260918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 329360918918SAndrei Emeltchenko chan->fcs); 32940a708f8fSGustavo F. Padovan } 32950a708f8fSGustavo F. Padovan break; 32960a708f8fSGustavo F. Padovan } 32970a708f8fSGustavo F. Padovan 3298fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 3299dcf4adbfSJoe Perches req->flags = cpu_to_le16(0); 33000a708f8fSGustavo F. Padovan 33010a708f8fSGustavo F. Padovan return ptr - data; 33020a708f8fSGustavo F. Padovan } 33030a708f8fSGustavo F. Padovan 330473ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 33050a708f8fSGustavo F. Padovan { 33060a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 33070a708f8fSGustavo F. Padovan void *ptr = rsp->data; 330873ffa904SGustavo F. Padovan void *req = chan->conf_req; 330973ffa904SGustavo F. Padovan int len = chan->conf_len; 33100a708f8fSGustavo F. Padovan int type, hint, olen; 33110a708f8fSGustavo F. Padovan unsigned long val; 33120a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 331342dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 331442dceae2SAndrei Emeltchenko u8 remote_efs = 0; 33150a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 33160a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 3317c8f79162SAndrei Emeltchenko u16 size; 33180a708f8fSGustavo F. Padovan 331973ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 33200a708f8fSGustavo F. Padovan 33210a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 33220a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 33230a708f8fSGustavo F. Padovan 33240a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 33250a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 33260a708f8fSGustavo F. Padovan 33270a708f8fSGustavo F. Padovan switch (type) { 33280a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 33290a708f8fSGustavo F. Padovan mtu = val; 33300a708f8fSGustavo F. Padovan break; 33310a708f8fSGustavo F. Padovan 33320a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 33330c1bc5c6SGustavo F. Padovan chan->flush_to = val; 33340a708f8fSGustavo F. Padovan break; 33350a708f8fSGustavo F. Padovan 33360a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 33370a708f8fSGustavo F. Padovan break; 33380a708f8fSGustavo F. Padovan 33390a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 33400a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 33410a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 33420a708f8fSGustavo F. Padovan break; 33430a708f8fSGustavo F. Padovan 33440a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 33450a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 3346f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, &chan->conf_state); 334742dceae2SAndrei Emeltchenko break; 33480a708f8fSGustavo F. Padovan 334942dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 335042dceae2SAndrei Emeltchenko remote_efs = 1; 335142dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 335242dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 33530a708f8fSGustavo F. Padovan break; 33540a708f8fSGustavo F. Padovan 33556327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 33560bd49fc7SJohan Hedberg if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP)) 33576327eb98SAndrei Emeltchenko return -ECONNREFUSED; 33586327eb98SAndrei Emeltchenko 33596327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 33606327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 3361836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 33626327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 33630a708f8fSGustavo F. Padovan break; 33640a708f8fSGustavo F. Padovan 33650a708f8fSGustavo F. Padovan default: 33660a708f8fSGustavo F. Padovan if (hint) 33670a708f8fSGustavo F. Padovan break; 33680a708f8fSGustavo F. Padovan 33690a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 33700a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 33710a708f8fSGustavo F. Padovan break; 33720a708f8fSGustavo F. Padovan } 33730a708f8fSGustavo F. Padovan } 33740a708f8fSGustavo F. Padovan 337573ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 33760a708f8fSGustavo F. Padovan goto done; 33770a708f8fSGustavo F. Padovan 33780c1bc5c6SGustavo F. Padovan switch (chan->mode) { 33790a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 33800a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3381c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 33820c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 33838c1d787bSGustavo F. Padovan chan->conn->feat_mask); 33840a708f8fSGustavo F. Padovan break; 33850a708f8fSGustavo F. Padovan } 33860a708f8fSGustavo F. Padovan 338742dceae2SAndrei Emeltchenko if (remote_efs) { 3388848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 338942dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 339042dceae2SAndrei Emeltchenko else 339142dceae2SAndrei Emeltchenko return -ECONNREFUSED; 339242dceae2SAndrei Emeltchenko } 339342dceae2SAndrei Emeltchenko 33940c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 33950a708f8fSGustavo F. Padovan return -ECONNREFUSED; 33960a708f8fSGustavo F. Padovan 33970a708f8fSGustavo F. Padovan break; 33980a708f8fSGustavo F. Padovan } 33990a708f8fSGustavo F. Padovan 34000a708f8fSGustavo F. Padovan done: 34010c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 34020a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 34030c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 34040a708f8fSGustavo F. Padovan 340573ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 34060a708f8fSGustavo F. Padovan return -ECONNREFUSED; 34070a708f8fSGustavo F. Padovan 34082d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 34092d792818SGustavo Padovan (unsigned long) &rfc); 34100a708f8fSGustavo F. Padovan } 34110a708f8fSGustavo F. Padovan 34120a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 34130a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 34140a708f8fSGustavo F. Padovan * which ones we don't like. */ 34150a708f8fSGustavo F. Padovan 34160a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 34170a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 34180a708f8fSGustavo F. Padovan else { 34190c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3420c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 34210a708f8fSGustavo F. Padovan } 34220c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 34230a708f8fSGustavo F. Padovan 342442dceae2SAndrei Emeltchenko if (remote_efs) { 342542dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 342642dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 342742dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 342842dceae2SAndrei Emeltchenko 342942dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 343042dceae2SAndrei Emeltchenko 343142dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 343242dceae2SAndrei Emeltchenko return -ECONNREFUSED; 343342dceae2SAndrei Emeltchenko 343442dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 343542dceae2SAndrei Emeltchenko sizeof(efs), 343642dceae2SAndrei Emeltchenko (unsigned long) &efs); 34370e8b207eSAndrei Emeltchenko } else { 34383e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 34390e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 34400e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 344142dceae2SAndrei Emeltchenko } 344242dceae2SAndrei Emeltchenko } 344342dceae2SAndrei Emeltchenko 34440a708f8fSGustavo F. Padovan switch (rfc.mode) { 34450a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 344647d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3447c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34480a708f8fSGustavo F. Padovan break; 34490a708f8fSGustavo F. Padovan 34500a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 34516327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 34522c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 34536327eb98SAndrei Emeltchenko else 34546327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 34556327eb98SAndrei Emeltchenko 34562c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 34570a708f8fSGustavo F. Padovan 3458c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 34592d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 34602d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3461c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3462c8f79162SAndrei Emeltchenko chan->remote_mps = size; 34630a708f8fSGustavo F. Padovan 346436c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 34650a708f8fSGustavo F. Padovan 3466c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34670a708f8fSGustavo F. Padovan 34680a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 34690a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 34700a708f8fSGustavo F. Padovan 347142dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 347242dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 347342dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 347442dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 347542dceae2SAndrei Emeltchenko chan->remote_flush_to = 347642dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 347742dceae2SAndrei Emeltchenko chan->remote_acc_lat = 347842dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 347942dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 348042dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 348142dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 34822d792818SGustavo Padovan sizeof(efs), 34832d792818SGustavo Padovan (unsigned long) &efs); 348442dceae2SAndrei Emeltchenko } 34850a708f8fSGustavo F. Padovan break; 34860a708f8fSGustavo F. Padovan 34870a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3488c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 34892d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 34902d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3491c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3492c8f79162SAndrei Emeltchenko chan->remote_mps = size; 34930a708f8fSGustavo F. Padovan 3494c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34950a708f8fSGustavo F. Padovan 34962d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 34972d792818SGustavo Padovan (unsigned long) &rfc); 34980a708f8fSGustavo F. Padovan 34990a708f8fSGustavo F. Padovan break; 35000a708f8fSGustavo F. Padovan 35010a708f8fSGustavo F. Padovan default: 35020a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 35030a708f8fSGustavo F. Padovan 35040a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 35050c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 35060a708f8fSGustavo F. Padovan } 35070a708f8fSGustavo F. Padovan 35080a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3509c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 35100a708f8fSGustavo F. Padovan } 3511fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 35120a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 3513dcf4adbfSJoe Perches rsp->flags = cpu_to_le16(0); 35140a708f8fSGustavo F. Padovan 35150a708f8fSGustavo F. Padovan return ptr - data; 35160a708f8fSGustavo F. Padovan } 35170a708f8fSGustavo F. Padovan 35182d792818SGustavo Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, 35192d792818SGustavo Padovan void *data, u16 *result) 35200a708f8fSGustavo F. Padovan { 35210a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 35220a708f8fSGustavo F. Padovan void *ptr = req->data; 35230a708f8fSGustavo F. Padovan int type, olen; 35240a708f8fSGustavo F. Padovan unsigned long val; 352536e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 352666af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 35270a708f8fSGustavo F. Padovan 3528fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 35290a708f8fSGustavo F. Padovan 35300a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 35310a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 35320a708f8fSGustavo F. Padovan 35330a708f8fSGustavo F. Padovan switch (type) { 35340a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 35350a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 35360a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 35370c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 35380a708f8fSGustavo F. Padovan } else 35390c1bc5c6SGustavo F. Padovan chan->imtu = val; 35400c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 35410a708f8fSGustavo F. Padovan break; 35420a708f8fSGustavo F. Padovan 35430a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 35440c1bc5c6SGustavo F. Padovan chan->flush_to = val; 35450a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 35460c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 35470a708f8fSGustavo F. Padovan break; 35480a708f8fSGustavo F. Padovan 35490a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 35500a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 35510a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 35520a708f8fSGustavo F. Padovan 3553c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 35540c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 35550a708f8fSGustavo F. Padovan return -ECONNREFUSED; 35560a708f8fSGustavo F. Padovan 355747d1ec61SGustavo F. Padovan chan->fcs = 0; 35580a708f8fSGustavo F. Padovan 35590a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 35600a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 35610a708f8fSGustavo F. Padovan break; 35626327eb98SAndrei Emeltchenko 35636327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3564c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 35653e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 35663e6b3b95SGustavo F. Padovan chan->tx_win); 35676327eb98SAndrei Emeltchenko break; 356866af7aafSAndrei Emeltchenko 356966af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 357066af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 357166af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 357266af7aafSAndrei Emeltchenko 357366af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 357466af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 357566af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 357666af7aafSAndrei Emeltchenko return -ECONNREFUSED; 357766af7aafSAndrei Emeltchenko 35782d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), 35792d792818SGustavo Padovan (unsigned long) &efs); 358066af7aafSAndrei Emeltchenko break; 3581cbabee78SAndrei Emeltchenko 3582cbabee78SAndrei Emeltchenko case L2CAP_CONF_FCS: 3583cbabee78SAndrei Emeltchenko if (*result == L2CAP_CONF_PENDING) 3584cbabee78SAndrei Emeltchenko if (val == L2CAP_FCS_NONE) 3585f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, 3586cbabee78SAndrei Emeltchenko &chan->conf_state); 3587cbabee78SAndrei Emeltchenko break; 35880a708f8fSGustavo F. Padovan } 35890a708f8fSGustavo F. Padovan } 35900a708f8fSGustavo F. Padovan 35910c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 35920a708f8fSGustavo F. Padovan return -ECONNREFUSED; 35930a708f8fSGustavo F. Padovan 35940c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 35950a708f8fSGustavo F. Padovan 35960e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 35970a708f8fSGustavo F. Padovan switch (rfc.mode) { 35980a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 359947d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 360047d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 360147d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3602c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3603c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3604c20f8e35SMat Martineau rfc.txwin_size); 360566af7aafSAndrei Emeltchenko 360666af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 360766af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 360866af7aafSAndrei Emeltchenko chan->local_sdu_itime = 360966af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 361066af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 361166af7aafSAndrei Emeltchenko chan->local_flush_to = 361266af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 361366af7aafSAndrei Emeltchenko } 36140a708f8fSGustavo F. Padovan break; 361566af7aafSAndrei Emeltchenko 36160a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 361747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 36180a708f8fSGustavo F. Padovan } 36190a708f8fSGustavo F. Padovan } 36200a708f8fSGustavo F. Padovan 3621fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 3622dcf4adbfSJoe Perches req->flags = cpu_to_le16(0); 36230a708f8fSGustavo F. Padovan 36240a708f8fSGustavo F. Padovan return ptr - data; 36250a708f8fSGustavo F. Padovan } 36260a708f8fSGustavo F. Padovan 36272d792818SGustavo Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, 36282d792818SGustavo Padovan u16 result, u16 flags) 36290a708f8fSGustavo F. Padovan { 36300a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 36310a708f8fSGustavo F. Padovan void *ptr = rsp->data; 36320a708f8fSGustavo F. Padovan 3633fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 36340a708f8fSGustavo F. Padovan 3635fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 36360a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 36370a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 36380a708f8fSGustavo F. Padovan 36390a708f8fSGustavo F. Padovan return ptr - data; 36400a708f8fSGustavo F. Padovan } 36410a708f8fSGustavo F. Padovan 364227e2d4c8SJohan Hedberg void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) 364327e2d4c8SJohan Hedberg { 364427e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 364527e2d4c8SJohan Hedberg struct l2cap_conn *conn = chan->conn; 364627e2d4c8SJohan Hedberg 364727e2d4c8SJohan Hedberg BT_DBG("chan %p", chan); 364827e2d4c8SJohan Hedberg 364927e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 365027e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 36513916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 36520cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(chan->rx_credits); 3653dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 365427e2d4c8SJohan Hedberg 365527e2d4c8SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), 365627e2d4c8SJohan Hedberg &rsp); 365727e2d4c8SJohan Hedberg } 365827e2d4c8SJohan Hedberg 36598c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3660710f9b0aSGustavo F. Padovan { 3661710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 36628c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3663710f9b0aSGustavo F. Padovan u8 buf[128]; 3664439f34acSAndrei Emeltchenko u8 rsp_code; 3665710f9b0aSGustavo F. Padovan 3666fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3667fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3668dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 3669dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 3670439f34acSAndrei Emeltchenko 3671439f34acSAndrei Emeltchenko if (chan->hs_hcon) 3672439f34acSAndrei Emeltchenko rsp_code = L2CAP_CREATE_CHAN_RSP; 3673439f34acSAndrei Emeltchenko else 3674439f34acSAndrei Emeltchenko rsp_code = L2CAP_CONN_RSP; 3675439f34acSAndrei Emeltchenko 3676439f34acSAndrei Emeltchenko BT_DBG("chan %p rsp_code %u", chan, rsp_code); 3677439f34acSAndrei Emeltchenko 3678439f34acSAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); 3679710f9b0aSGustavo F. Padovan 3680c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3681710f9b0aSGustavo F. Padovan return; 3682710f9b0aSGustavo F. Padovan 3683710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3684710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3685710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3686710f9b0aSGustavo F. Padovan } 3687710f9b0aSGustavo F. Padovan 368847d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 36890a708f8fSGustavo F. Padovan { 36900a708f8fSGustavo F. Padovan int type, olen; 36910a708f8fSGustavo F. Padovan unsigned long val; 3692c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3693c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3694c20f8e35SMat Martineau */ 3695c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3696c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3697c20f8e35SMat Martineau .mode = chan->mode, 3698dcf4adbfSJoe Perches .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3699dcf4adbfSJoe Perches .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3700c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3701c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3702c20f8e35SMat Martineau }; 37030a708f8fSGustavo F. Padovan 370447d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 37050a708f8fSGustavo F. Padovan 37060c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 37070a708f8fSGustavo F. Padovan return; 37080a708f8fSGustavo F. Padovan 37090a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 37100a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 37110a708f8fSGustavo F. Padovan 3712c20f8e35SMat Martineau switch (type) { 3713c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3714c20f8e35SMat Martineau if (olen == sizeof(rfc)) 37150a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3716c20f8e35SMat Martineau break; 3717c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3718c20f8e35SMat Martineau txwin_ext = val; 3719c20f8e35SMat Martineau break; 3720c20f8e35SMat Martineau } 37210a708f8fSGustavo F. Padovan } 37220a708f8fSGustavo F. Padovan 37230a708f8fSGustavo F. Padovan switch (rfc.mode) { 37240a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 372547d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 372647d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 372747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3728c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3729c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3730c20f8e35SMat Martineau else 3731c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3732c20f8e35SMat Martineau rfc.txwin_size); 37330a708f8fSGustavo F. Padovan break; 37340a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 373547d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 37360a708f8fSGustavo F. Padovan } 37370a708f8fSGustavo F. Padovan } 37380a708f8fSGustavo F. Padovan 37392d792818SGustavo Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, 3740cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3741cb3b3152SJohan Hedberg u8 *data) 37420a708f8fSGustavo F. Padovan { 3743e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 37440a708f8fSGustavo F. Padovan 3745cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rej)) 3746cb3b3152SJohan Hedberg return -EPROTO; 3747cb3b3152SJohan Hedberg 3748e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 37490a708f8fSGustavo F. Padovan return 0; 37500a708f8fSGustavo F. Padovan 37510a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 37520a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 375317cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 37540a708f8fSGustavo F. Padovan 37550a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 37560a708f8fSGustavo F. Padovan conn->info_ident = 0; 37570a708f8fSGustavo F. Padovan 37580a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 37590a708f8fSGustavo F. Padovan } 37600a708f8fSGustavo F. Padovan 37610a708f8fSGustavo F. Padovan return 0; 37620a708f8fSGustavo F. Padovan } 37630a708f8fSGustavo F. Padovan 37641700915fSMat Martineau static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, 37651700915fSMat Martineau struct l2cap_cmd_hdr *cmd, 37664c89b6aaSMat Martineau u8 *data, u8 rsp_code, u8 amp_id) 37670a708f8fSGustavo F. Padovan { 37680a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 37690a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 377023691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 37710a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 37720a708f8fSGustavo F. Padovan 37730a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 37740a708f8fSGustavo F. Padovan __le16 psm = req->psm; 37750a708f8fSGustavo F. Padovan 3776097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 37770a708f8fSGustavo F. Padovan 37780a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 37796f59b904SMarcel Holtmann pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, 3780bf20fd4eSJohan Hedberg &conn->hcon->dst, ACL_LINK); 378123691d75SGustavo F. Padovan if (!pchan) { 37820a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 37830a708f8fSGustavo F. Padovan goto sendresp; 37840a708f8fSGustavo F. Padovan } 37850a708f8fSGustavo F. Padovan 37863df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 37878ffb9290SGustavo Padovan l2cap_chan_lock(pchan); 37880a708f8fSGustavo F. Padovan 37890a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 3790dcf4adbfSJoe Perches if (psm != cpu_to_le16(L2CAP_PSM_SDP) && 37910a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 37929f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 37930a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 37940a708f8fSGustavo F. Padovan goto response; 37950a708f8fSGustavo F. Padovan } 37960a708f8fSGustavo F. Padovan 37970a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 37980a708f8fSGustavo F. Padovan 37992dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 38002dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 38012dfa1003SGustavo Padovan goto response; 38022dfa1003SGustavo Padovan 380380b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 380480808e43SGustavo F. Padovan if (!chan) 38050a708f8fSGustavo F. Padovan goto response; 38060a708f8fSGustavo F. Padovan 3807330b6c15SSyam Sidhardhan /* For certain devices (ex: HID mouse), support for authentication, 3808330b6c15SSyam Sidhardhan * pairing and bonding is optional. For such devices, inorder to avoid 3809330b6c15SSyam Sidhardhan * the ACL alive for too long after L2CAP disconnection, reset the ACL 3810330b6c15SSyam Sidhardhan * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. 3811330b6c15SSyam Sidhardhan */ 3812330b6c15SSyam Sidhardhan conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 3813330b6c15SSyam Sidhardhan 38147eafc59eSMarcel Holtmann bacpy(&chan->src, &conn->hcon->src); 38157eafc59eSMarcel Holtmann bacpy(&chan->dst, &conn->hcon->dst); 3816a250e048SJohan Hedberg chan->src_type = bdaddr_src_type(conn->hcon); 3817a250e048SJohan Hedberg chan->dst_type = bdaddr_dst_type(conn->hcon); 3818fe4128e0SGustavo F. Padovan chan->psm = psm; 3819fe4128e0SGustavo F. Padovan chan->dcid = scid; 38201700915fSMat Martineau chan->local_amp_id = amp_id; 38210a708f8fSGustavo F. Padovan 38226be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 382348454079SGustavo F. Padovan 3824fe4128e0SGustavo F. Padovan dcid = chan->scid; 38250a708f8fSGustavo F. Padovan 38268d836d71SGustavo Padovan __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 38270a708f8fSGustavo F. Padovan 3828fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 38290a708f8fSGustavo F. Padovan 38300a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3831e7cafc45SJohan Hedberg if (l2cap_chan_check_security(chan, false)) { 3832bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 3833f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38340a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38350a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 38362dc4e510SGustavo Padovan chan->ops->defer(chan); 38370a708f8fSGustavo F. Padovan } else { 38381700915fSMat Martineau /* Force pending result for AMP controllers. 38391700915fSMat Martineau * The connection will succeed after the 38401700915fSMat Martineau * physical link is up. 38411700915fSMat Martineau */ 38426ed971caSMarcel Holtmann if (amp_id == AMP_ID_BREDR) { 3843f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 38440a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 38456ed971caSMarcel Holtmann } else { 3846f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38476ed971caSMarcel Holtmann result = L2CAP_CR_PEND; 38481700915fSMat Martineau } 38490a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38500a708f8fSGustavo F. Padovan } 38510a708f8fSGustavo F. Padovan } else { 3852f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38530a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38540a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 38550a708f8fSGustavo F. Padovan } 38560a708f8fSGustavo F. Padovan } else { 3857f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38580a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38590a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38600a708f8fSGustavo F. Padovan } 38610a708f8fSGustavo F. Padovan 38620a708f8fSGustavo F. Padovan response: 38638ffb9290SGustavo Padovan l2cap_chan_unlock(pchan); 38643df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 3865a24cce14SJohan Hedberg l2cap_chan_put(pchan); 38660a708f8fSGustavo F. Padovan 38670a708f8fSGustavo F. Padovan sendresp: 38680a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 38690a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 38700a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 38710a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 38724c89b6aaSMat Martineau l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); 38730a708f8fSGustavo F. Padovan 38740a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 38750a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3876dcf4adbfSJoe Perches info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 38770a708f8fSGustavo F. Padovan 38780a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 38790a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 38800a708f8fSGustavo F. Padovan 3881ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 38820a708f8fSGustavo F. Padovan 38832d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 38842d792818SGustavo Padovan sizeof(info), &info); 38850a708f8fSGustavo F. Padovan } 38860a708f8fSGustavo F. Padovan 3887c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 38880a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 38890a708f8fSGustavo F. Padovan u8 buf[128]; 3890c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 38910a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 389273ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 389373ffa904SGustavo F. Padovan chan->num_conf_req++; 38940a708f8fSGustavo F. Padovan } 38951700915fSMat Martineau 38961700915fSMat Martineau return chan; 38974c89b6aaSMat Martineau } 38980a708f8fSGustavo F. Padovan 38994c89b6aaSMat Martineau static int l2cap_connect_req(struct l2cap_conn *conn, 3900cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 39014c89b6aaSMat Martineau { 39027b064edaSJaganath Kanakkassery struct hci_dev *hdev = conn->hcon->hdev; 39037b064edaSJaganath Kanakkassery struct hci_conn *hcon = conn->hcon; 39047b064edaSJaganath Kanakkassery 3905cb3b3152SJohan Hedberg if (cmd_len < sizeof(struct l2cap_conn_req)) 3906cb3b3152SJohan Hedberg return -EPROTO; 3907cb3b3152SJohan Hedberg 39087b064edaSJaganath Kanakkassery hci_dev_lock(hdev); 3909d7a5a11dSMarcel Holtmann if (hci_dev_test_flag(hdev, HCI_MGMT) && 39107b064edaSJaganath Kanakkassery !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) 391148ec92faSAlfonso Acosta mgmt_device_connected(hdev, hcon, 0, NULL, 0); 39127b064edaSJaganath Kanakkassery hci_dev_unlock(hdev); 39137b064edaSJaganath Kanakkassery 3914300229f9SGustavo Padovan l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); 39150a708f8fSGustavo F. Padovan return 0; 39160a708f8fSGustavo F. Padovan } 39170a708f8fSGustavo F. Padovan 39185909cf30SMat Martineau static int l2cap_connect_create_rsp(struct l2cap_conn *conn, 3919cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3920cb3b3152SJohan Hedberg u8 *data) 39210a708f8fSGustavo F. Padovan { 39220a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 39230a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 392448454079SGustavo F. Padovan struct l2cap_chan *chan; 39250a708f8fSGustavo F. Padovan u8 req[128]; 39263df91ea2SAndrei Emeltchenko int err; 39270a708f8fSGustavo F. Padovan 3928cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 3929cb3b3152SJohan Hedberg return -EPROTO; 3930cb3b3152SJohan Hedberg 39310a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 39320a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 39330a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 39340a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 39350a708f8fSGustavo F. Padovan 39361b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 39371b009c98SAndrei Emeltchenko dcid, scid, result, status); 39380a708f8fSGustavo F. Padovan 39393df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 39403df91ea2SAndrei Emeltchenko 39410a708f8fSGustavo F. Padovan if (scid) { 39423df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 39433df91ea2SAndrei Emeltchenko if (!chan) { 394421870b52SJohan Hedberg err = -EBADSLT; 39453df91ea2SAndrei Emeltchenko goto unlock; 39463df91ea2SAndrei Emeltchenko } 39470a708f8fSGustavo F. Padovan } else { 39483df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 39493df91ea2SAndrei Emeltchenko if (!chan) { 395021870b52SJohan Hedberg err = -EBADSLT; 39513df91ea2SAndrei Emeltchenko goto unlock; 39523df91ea2SAndrei Emeltchenko } 39530a708f8fSGustavo F. Padovan } 39540a708f8fSGustavo F. Padovan 39553df91ea2SAndrei Emeltchenko err = 0; 39563df91ea2SAndrei Emeltchenko 39576be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 395848454079SGustavo F. Padovan 39590a708f8fSGustavo F. Padovan switch (result) { 39600a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 396189bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3962fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3963fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3964c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 39650a708f8fSGustavo F. Padovan 3966c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 39670a708f8fSGustavo F. Padovan break; 39680a708f8fSGustavo F. Padovan 39690a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 397073ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 397173ffa904SGustavo F. Padovan chan->num_conf_req++; 39720a708f8fSGustavo F. Padovan break; 39730a708f8fSGustavo F. Padovan 39740a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3975c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 39760a708f8fSGustavo F. Padovan break; 39770a708f8fSGustavo F. Padovan 39780a708f8fSGustavo F. Padovan default: 397948454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 39800a708f8fSGustavo F. Padovan break; 39810a708f8fSGustavo F. Padovan } 39820a708f8fSGustavo F. Padovan 39836be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 39843df91ea2SAndrei Emeltchenko 39853df91ea2SAndrei Emeltchenko unlock: 39863df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 39873df91ea2SAndrei Emeltchenko 39883df91ea2SAndrei Emeltchenko return err; 39890a708f8fSGustavo F. Padovan } 39900a708f8fSGustavo F. Padovan 399147d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 39920a708f8fSGustavo F. Padovan { 39930a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 39940a708f8fSGustavo F. Padovan * sides request it. 39950a708f8fSGustavo F. Padovan */ 39960c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 399747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3998f2592d3eSAndrei Emeltchenko else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) 399947d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 40000a708f8fSGustavo F. Padovan } 40010a708f8fSGustavo F. Padovan 400229d8a590SAndrei Emeltchenko static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, 400329d8a590SAndrei Emeltchenko u8 ident, u16 flags) 400429d8a590SAndrei Emeltchenko { 400529d8a590SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 400629d8a590SAndrei Emeltchenko 400729d8a590SAndrei Emeltchenko BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, 400829d8a590SAndrei Emeltchenko flags); 400929d8a590SAndrei Emeltchenko 401029d8a590SAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 401129d8a590SAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 401229d8a590SAndrei Emeltchenko 401329d8a590SAndrei Emeltchenko l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, 401429d8a590SAndrei Emeltchenko l2cap_build_conf_rsp(chan, data, 401529d8a590SAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), data); 401629d8a590SAndrei Emeltchenko } 401729d8a590SAndrei Emeltchenko 4018662d652dSJohan Hedberg static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, 4019662d652dSJohan Hedberg u16 scid, u16 dcid) 4020662d652dSJohan Hedberg { 4021662d652dSJohan Hedberg struct l2cap_cmd_rej_cid rej; 4022662d652dSJohan Hedberg 4023dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); 4024662d652dSJohan Hedberg rej.scid = __cpu_to_le16(scid); 4025662d652dSJohan Hedberg rej.dcid = __cpu_to_le16(dcid); 4026662d652dSJohan Hedberg 4027662d652dSJohan Hedberg l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 4028662d652dSJohan Hedberg } 4029662d652dSJohan Hedberg 40302d792818SGustavo Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, 40312d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 40322d792818SGustavo Padovan u8 *data) 40330a708f8fSGustavo F. Padovan { 40340a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 40350a708f8fSGustavo F. Padovan u16 dcid, flags; 40360a708f8fSGustavo F. Padovan u8 rsp[64]; 403748454079SGustavo F. Padovan struct l2cap_chan *chan; 40383c588192SMat Martineau int len, err = 0; 40390a708f8fSGustavo F. Padovan 4040cb3b3152SJohan Hedberg if (cmd_len < sizeof(*req)) 4041cb3b3152SJohan Hedberg return -EPROTO; 4042cb3b3152SJohan Hedberg 40430a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 40440a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 40450a708f8fSGustavo F. Padovan 40460a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 40470a708f8fSGustavo F. Padovan 4048baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 4049662d652dSJohan Hedberg if (!chan) { 4050662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); 4051662d652dSJohan Hedberg return 0; 4052662d652dSJohan Hedberg } 40530a708f8fSGustavo F. Padovan 4054033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 4055662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, 4056662d652dSJohan Hedberg chan->dcid); 40570a708f8fSGustavo F. Padovan goto unlock; 40580a708f8fSGustavo F. Padovan } 40590a708f8fSGustavo F. Padovan 40600a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 40610a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 4062cb3b3152SJohan Hedberg if (chan->conf_len + len > sizeof(chan->conf_req)) { 40630a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4064fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40650a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 40660a708f8fSGustavo F. Padovan goto unlock; 40670a708f8fSGustavo F. Padovan } 40680a708f8fSGustavo F. Padovan 40690a708f8fSGustavo F. Padovan /* Store config. */ 407073ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 407173ffa904SGustavo F. Padovan chan->conf_len += len; 40720a708f8fSGustavo F. Padovan 407359e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 40740a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 40750a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4076fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40775325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 40780a708f8fSGustavo F. Padovan goto unlock; 40790a708f8fSGustavo F. Padovan } 40800a708f8fSGustavo F. Padovan 40810a708f8fSGustavo F. Padovan /* Complete config. */ 408273ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 40830a708f8fSGustavo F. Padovan if (len < 0) { 40845e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 40850a708f8fSGustavo F. Padovan goto unlock; 40860a708f8fSGustavo F. Padovan } 40870a708f8fSGustavo F. Padovan 40881500109bSMat Martineau chan->ident = cmd->ident; 40890a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 409073ffa904SGustavo F. Padovan chan->num_conf_rsp++; 40910a708f8fSGustavo F. Padovan 40920a708f8fSGustavo F. Padovan /* Reset config buffer. */ 409373ffa904SGustavo F. Padovan chan->conf_len = 0; 40940a708f8fSGustavo F. Padovan 4095c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 40960a708f8fSGustavo F. Padovan goto unlock; 40970a708f8fSGustavo F. Padovan 4098c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 409947d1ec61SGustavo F. Padovan set_default_fcs(chan); 41000a708f8fSGustavo F. Padovan 4101105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4102105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 41033c588192SMat Martineau err = l2cap_ertm_init(chan); 41040a708f8fSGustavo F. Padovan 41053c588192SMat Martineau if (err < 0) 41065e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 41073c588192SMat Martineau else 4108cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 41093c588192SMat Martineau 41100a708f8fSGustavo F. Padovan goto unlock; 41110a708f8fSGustavo F. Padovan } 41120a708f8fSGustavo F. Padovan 4113c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 41140a708f8fSGustavo F. Padovan u8 buf[64]; 41150a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 411673ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 411773ffa904SGustavo F. Padovan chan->num_conf_req++; 41180a708f8fSGustavo F. Padovan } 41190a708f8fSGustavo F. Padovan 412049c922bbSStephen Hemminger /* Got Conf Rsp PENDING from remote side and assume we sent 41210e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 41220e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 41230e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 41240e8b207eSAndrei Emeltchenko 41250e8b207eSAndrei Emeltchenko /* check compatibility */ 41260e8b207eSAndrei Emeltchenko 412779de886dSAndrei Emeltchenko /* Send rsp for BR/EDR channel */ 4128f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) 412929d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); 413079de886dSAndrei Emeltchenko else 413179de886dSAndrei Emeltchenko chan->ident = cmd->ident; 41320e8b207eSAndrei Emeltchenko } 41330e8b207eSAndrei Emeltchenko 41340a708f8fSGustavo F. Padovan unlock: 41356be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 41363c588192SMat Martineau return err; 41370a708f8fSGustavo F. Padovan } 41380a708f8fSGustavo F. Padovan 41392d792818SGustavo Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, 4140cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4141cb3b3152SJohan Hedberg u8 *data) 41420a708f8fSGustavo F. Padovan { 41430a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 41440a708f8fSGustavo F. Padovan u16 scid, flags, result; 414548454079SGustavo F. Padovan struct l2cap_chan *chan; 4146cb3b3152SJohan Hedberg int len = cmd_len - sizeof(*rsp); 41473c588192SMat Martineau int err = 0; 41480a708f8fSGustavo F. Padovan 4149cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 4150cb3b3152SJohan Hedberg return -EPROTO; 4151cb3b3152SJohan Hedberg 41520a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 41530a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 41540a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 41550a708f8fSGustavo F. Padovan 415661386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 415761386cbaSAndrei Emeltchenko result, len); 41580a708f8fSGustavo F. Padovan 4159baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 416048454079SGustavo F. Padovan if (!chan) 41610a708f8fSGustavo F. Padovan return 0; 41620a708f8fSGustavo F. Padovan 41630a708f8fSGustavo F. Padovan switch (result) { 41640a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 416547d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 41660e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41670a708f8fSGustavo F. Padovan break; 41680a708f8fSGustavo F. Padovan 41690e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 41700e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41710e8b207eSAndrei Emeltchenko 41720e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 41730e8b207eSAndrei Emeltchenko char buf[64]; 41740e8b207eSAndrei Emeltchenko 41750e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 41760e8b207eSAndrei Emeltchenko buf, &result); 41770e8b207eSAndrei Emeltchenko if (len < 0) { 41785e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41790e8b207eSAndrei Emeltchenko goto done; 41800e8b207eSAndrei Emeltchenko } 41810e8b207eSAndrei Emeltchenko 4182f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) { 418379de886dSAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 418479de886dSAndrei Emeltchenko 0); 41855ce66b59SAndrei Emeltchenko } else { 41865ce66b59SAndrei Emeltchenko if (l2cap_check_efs(chan)) { 41875ce66b59SAndrei Emeltchenko amp_create_logical_link(chan); 418879de886dSAndrei Emeltchenko chan->ident = cmd->ident; 41890e8b207eSAndrei Emeltchenko } 41905ce66b59SAndrei Emeltchenko } 41915ce66b59SAndrei Emeltchenko } 41920e8b207eSAndrei Emeltchenko goto done; 41930e8b207eSAndrei Emeltchenko 41940a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 419573ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 41960a708f8fSGustavo F. Padovan char req[64]; 41970a708f8fSGustavo F. Padovan 41980a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 41995e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42000a708f8fSGustavo F. Padovan goto done; 42010a708f8fSGustavo F. Padovan } 42020a708f8fSGustavo F. Padovan 42030a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 42040a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 4205b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 4206b4450035SGustavo F. Padovan req, &result); 42070a708f8fSGustavo F. Padovan if (len < 0) { 42085e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42090a708f8fSGustavo F. Padovan goto done; 42100a708f8fSGustavo F. Padovan } 42110a708f8fSGustavo F. Padovan 42120a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 42130a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 421473ffa904SGustavo F. Padovan chan->num_conf_req++; 42150a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 42160a708f8fSGustavo F. Padovan goto done; 42170a708f8fSGustavo F. Padovan break; 42180a708f8fSGustavo F. Padovan } 42190a708f8fSGustavo F. Padovan 42200a708f8fSGustavo F. Padovan default: 42216be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 42222e0052e4SAndrei Emeltchenko 4223ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 42245e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42250a708f8fSGustavo F. Padovan goto done; 42260a708f8fSGustavo F. Padovan } 42270a708f8fSGustavo F. Padovan 422859e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 42290a708f8fSGustavo F. Padovan goto done; 42300a708f8fSGustavo F. Padovan 4231c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 42320a708f8fSGustavo F. Padovan 4233c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 423447d1ec61SGustavo F. Padovan set_default_fcs(chan); 42350a708f8fSGustavo F. Padovan 4236105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4237105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 42383c588192SMat Martineau err = l2cap_ertm_init(chan); 42390a708f8fSGustavo F. Padovan 42403c588192SMat Martineau if (err < 0) 42415e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 42423c588192SMat Martineau else 4243cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 42440a708f8fSGustavo F. Padovan } 42450a708f8fSGustavo F. Padovan 42460a708f8fSGustavo F. Padovan done: 42476be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 42483c588192SMat Martineau return err; 42490a708f8fSGustavo F. Padovan } 42500a708f8fSGustavo F. Padovan 42512d792818SGustavo Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, 4252cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4253cb3b3152SJohan Hedberg u8 *data) 42540a708f8fSGustavo F. Padovan { 42550a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 42560a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 42570a708f8fSGustavo F. Padovan u16 dcid, scid; 425848454079SGustavo F. Padovan struct l2cap_chan *chan; 42590a708f8fSGustavo F. Padovan 4260cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4261cb3b3152SJohan Hedberg return -EPROTO; 4262cb3b3152SJohan Hedberg 42630a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 42640a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 42650a708f8fSGustavo F. Padovan 42660a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 42670a708f8fSGustavo F. Padovan 42683df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 42693df91ea2SAndrei Emeltchenko 42703df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 42713df91ea2SAndrei Emeltchenko if (!chan) { 42723df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4273662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); 4274662d652dSJohan Hedberg return 0; 42753df91ea2SAndrei Emeltchenko } 42760a708f8fSGustavo F. Padovan 42776be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 42786be36555SAndrei Emeltchenko 4279fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4280fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 42810a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 42820a708f8fSGustavo F. Padovan 42835ec1bbe5SGustavo Padovan chan->ops->set_shutdown(chan); 42840a708f8fSGustavo F. Padovan 428561d6ef3eSMat Martineau l2cap_chan_hold(chan); 428648454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 42876be36555SAndrei Emeltchenko 42886be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 42890a708f8fSGustavo F. Padovan 429080b98027SGustavo Padovan chan->ops->close(chan); 429161d6ef3eSMat Martineau l2cap_chan_put(chan); 42923df91ea2SAndrei Emeltchenko 42933df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 42943df91ea2SAndrei Emeltchenko 42950a708f8fSGustavo F. Padovan return 0; 42960a708f8fSGustavo F. Padovan } 42970a708f8fSGustavo F. Padovan 42982d792818SGustavo Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, 4299cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4300cb3b3152SJohan Hedberg u8 *data) 43010a708f8fSGustavo F. Padovan { 43020a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 43030a708f8fSGustavo F. Padovan u16 dcid, scid; 430448454079SGustavo F. Padovan struct l2cap_chan *chan; 43050a708f8fSGustavo F. Padovan 4306cb3b3152SJohan Hedberg if (cmd_len != sizeof(*rsp)) 4307cb3b3152SJohan Hedberg return -EPROTO; 4308cb3b3152SJohan Hedberg 43090a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 43100a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 43110a708f8fSGustavo F. Padovan 43120a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 43130a708f8fSGustavo F. Padovan 43143df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 43153df91ea2SAndrei Emeltchenko 43163df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 43173df91ea2SAndrei Emeltchenko if (!chan) { 43183df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 43190a708f8fSGustavo F. Padovan return 0; 43203df91ea2SAndrei Emeltchenko } 43210a708f8fSGustavo F. Padovan 43226be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 432348454079SGustavo F. Padovan 432461d6ef3eSMat Martineau l2cap_chan_hold(chan); 432548454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 43266be36555SAndrei Emeltchenko 43276be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 43280a708f8fSGustavo F. Padovan 432980b98027SGustavo Padovan chan->ops->close(chan); 433061d6ef3eSMat Martineau l2cap_chan_put(chan); 43313df91ea2SAndrei Emeltchenko 43323df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 43333df91ea2SAndrei Emeltchenko 43340a708f8fSGustavo F. Padovan return 0; 43350a708f8fSGustavo F. Padovan } 43360a708f8fSGustavo F. Padovan 43372d792818SGustavo Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, 4338cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4339cb3b3152SJohan Hedberg u8 *data) 43400a708f8fSGustavo F. Padovan { 43410a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 43420a708f8fSGustavo F. Padovan u16 type; 43430a708f8fSGustavo F. Padovan 4344cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4345cb3b3152SJohan Hedberg return -EPROTO; 4346cb3b3152SJohan Hedberg 43470a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 43480a708f8fSGustavo F. Padovan 43490a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 43500a708f8fSGustavo F. Padovan 43510a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 43520a708f8fSGustavo F. Padovan u8 buf[8]; 43530a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 43540a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 4355dcf4adbfSJoe Perches rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 4356dcf4adbfSJoe Perches rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 43570a708f8fSGustavo F. Padovan if (!disable_ertm) 43580a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 43590a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 43600bd49fc7SJohan Hedberg if (conn->local_fixed_chan & L2CAP_FC_A2MP) 43616327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 43626327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 4363a5fd6f30SAndrei Emeltchenko 43640a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 43652d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43662d792818SGustavo Padovan buf); 43670a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 43680a708f8fSGustavo F. Padovan u8 buf[12]; 43690a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 437050a147cdSMat Martineau 4371dcf4adbfSJoe Perches rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 4372dcf4adbfSJoe Perches rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 43730bd49fc7SJohan Hedberg rsp->data[0] = conn->local_fixed_chan; 43740bd49fc7SJohan Hedberg memset(rsp->data + 1, 0, 7); 43752d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43762d792818SGustavo Padovan buf); 43770a708f8fSGustavo F. Padovan } else { 43780a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 43790a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 4380dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 43812d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), 43822d792818SGustavo Padovan &rsp); 43830a708f8fSGustavo F. Padovan } 43840a708f8fSGustavo F. Padovan 43850a708f8fSGustavo F. Padovan return 0; 43860a708f8fSGustavo F. Padovan } 43870a708f8fSGustavo F. Padovan 43882d792818SGustavo Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, 4389cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4390cb3b3152SJohan Hedberg u8 *data) 43910a708f8fSGustavo F. Padovan { 43920a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 43930a708f8fSGustavo F. Padovan u16 type, result; 43940a708f8fSGustavo F. Padovan 43953f6fa3d4SJaganath Kanakkassery if (cmd_len < sizeof(*rsp)) 4396cb3b3152SJohan Hedberg return -EPROTO; 4397cb3b3152SJohan Hedberg 43980a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 43990a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 44000a708f8fSGustavo F. Padovan 44010a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 44020a708f8fSGustavo F. Padovan 4403e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 4404e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 4405e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 4406e90165beSAndrei Emeltchenko return 0; 4407e90165beSAndrei Emeltchenko 440817cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 44090a708f8fSGustavo F. Padovan 44100a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 44110a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44120a708f8fSGustavo F. Padovan conn->info_ident = 0; 44130a708f8fSGustavo F. Padovan 44140a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 44150a708f8fSGustavo F. Padovan 44160a708f8fSGustavo F. Padovan return 0; 44170a708f8fSGustavo F. Padovan } 44180a708f8fSGustavo F. Padovan 4419978c93b9SAndrei Emeltchenko switch (type) { 4420978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 44210a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 44220a708f8fSGustavo F. Padovan 44230a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 44240a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4425dcf4adbfSJoe Perches req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 44260a708f8fSGustavo F. Padovan 44270a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 44280a708f8fSGustavo F. Padovan 44290a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 44300a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 44310a708f8fSGustavo F. Padovan } else { 44320a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44330a708f8fSGustavo F. Padovan conn->info_ident = 0; 44340a708f8fSGustavo F. Padovan 44350a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 44360a708f8fSGustavo F. Padovan } 4437978c93b9SAndrei Emeltchenko break; 4438978c93b9SAndrei Emeltchenko 4439978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 44400bd49fc7SJohan Hedberg conn->remote_fixed_chan = rsp->data[0]; 44410a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44420a708f8fSGustavo F. Padovan conn->info_ident = 0; 44430a708f8fSGustavo F. Padovan 44440a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 4445978c93b9SAndrei Emeltchenko break; 44460a708f8fSGustavo F. Padovan } 44470a708f8fSGustavo F. Padovan 44480a708f8fSGustavo F. Padovan return 0; 44490a708f8fSGustavo F. Padovan } 44500a708f8fSGustavo F. Padovan 44511700915fSMat Martineau static int l2cap_create_channel_req(struct l2cap_conn *conn, 44522d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 44532d792818SGustavo Padovan u16 cmd_len, void *data) 4454f94ff6ffSMat Martineau { 4455f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 44566e1df6a6SAndrei Emeltchenko struct l2cap_create_chan_rsp rsp; 44571700915fSMat Martineau struct l2cap_chan *chan; 44586e1df6a6SAndrei Emeltchenko struct hci_dev *hdev; 4459f94ff6ffSMat Martineau u16 psm, scid; 4460f94ff6ffSMat Martineau 4461f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 4462f94ff6ffSMat Martineau return -EPROTO; 4463f94ff6ffSMat Martineau 44640bd49fc7SJohan Hedberg if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) 4465f94ff6ffSMat Martineau return -EINVAL; 4466f94ff6ffSMat Martineau 4467f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 4468f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 4469f94ff6ffSMat Martineau 4470ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 4471f94ff6ffSMat Martineau 44726e1df6a6SAndrei Emeltchenko /* For controller id 0 make BR/EDR connection */ 44736ed971caSMarcel Holtmann if (req->amp_id == AMP_ID_BREDR) { 44746e1df6a6SAndrei Emeltchenko l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 44756e1df6a6SAndrei Emeltchenko req->amp_id); 44766e1df6a6SAndrei Emeltchenko return 0; 44776e1df6a6SAndrei Emeltchenko } 44781700915fSMat Martineau 44791700915fSMat Martineau /* Validate AMP controller id */ 44801700915fSMat Martineau hdev = hci_dev_get(req->amp_id); 44816e1df6a6SAndrei Emeltchenko if (!hdev) 44826e1df6a6SAndrei Emeltchenko goto error; 44831700915fSMat Martineau 44846e1df6a6SAndrei Emeltchenko if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { 44856e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 44866e1df6a6SAndrei Emeltchenko goto error; 44876e1df6a6SAndrei Emeltchenko } 44886e1df6a6SAndrei Emeltchenko 44896e1df6a6SAndrei Emeltchenko chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 44906e1df6a6SAndrei Emeltchenko req->amp_id); 44916e1df6a6SAndrei Emeltchenko if (chan) { 44926e1df6a6SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 44936e1df6a6SAndrei Emeltchenko struct hci_conn *hs_hcon; 44946e1df6a6SAndrei Emeltchenko 449598e0f7eaSMarcel Holtmann hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, 449698e0f7eaSMarcel Holtmann &conn->hcon->dst); 44976e1df6a6SAndrei Emeltchenko if (!hs_hcon) { 44986e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 4499662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, 4500662d652dSJohan Hedberg chan->dcid); 4501662d652dSJohan Hedberg return 0; 45026e1df6a6SAndrei Emeltchenko } 45036e1df6a6SAndrei Emeltchenko 45046e1df6a6SAndrei Emeltchenko BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); 45056e1df6a6SAndrei Emeltchenko 45066e1df6a6SAndrei Emeltchenko mgr->bredr_chan = chan; 45076e1df6a6SAndrei Emeltchenko chan->hs_hcon = hs_hcon; 4508fd45bf4cSAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 45096e1df6a6SAndrei Emeltchenko conn->mtu = hdev->block_mtu; 45106e1df6a6SAndrei Emeltchenko } 45116e1df6a6SAndrei Emeltchenko 45126e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 45136e1df6a6SAndrei Emeltchenko 45146e1df6a6SAndrei Emeltchenko return 0; 45156e1df6a6SAndrei Emeltchenko 45166e1df6a6SAndrei Emeltchenko error: 4517f94ff6ffSMat Martineau rsp.dcid = 0; 4518f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 4519dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); 4520dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4521f94ff6ffSMat Martineau 4522f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 4523f94ff6ffSMat Martineau sizeof(rsp), &rsp); 4524f94ff6ffSMat Martineau 4525dc280801SJohan Hedberg return 0; 4526f94ff6ffSMat Martineau } 4527f94ff6ffSMat Martineau 45288eb200bdSMat Martineau static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) 45298eb200bdSMat Martineau { 45308eb200bdSMat Martineau struct l2cap_move_chan_req req; 45318eb200bdSMat Martineau u8 ident; 45328eb200bdSMat Martineau 45338eb200bdSMat Martineau BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); 45348eb200bdSMat Martineau 45358eb200bdSMat Martineau ident = l2cap_get_ident(chan->conn); 45368eb200bdSMat Martineau chan->ident = ident; 45378eb200bdSMat Martineau 45388eb200bdSMat Martineau req.icid = cpu_to_le16(chan->scid); 45398eb200bdSMat Martineau req.dest_amp_id = dest_amp_id; 45408eb200bdSMat Martineau 45418eb200bdSMat Martineau l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), 45428eb200bdSMat Martineau &req); 45438eb200bdSMat Martineau 45448eb200bdSMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 45458eb200bdSMat Martineau } 45468eb200bdSMat Martineau 45471500109bSMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) 45488d5a04a1SMat Martineau { 45498d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 45508d5a04a1SMat Martineau 45511500109bSMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45528d5a04a1SMat Martineau 45531500109bSMat Martineau rsp.icid = cpu_to_le16(chan->dcid); 45548d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 45558d5a04a1SMat Martineau 45561500109bSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, 45571500109bSMat Martineau sizeof(rsp), &rsp); 45588d5a04a1SMat Martineau } 45598d5a04a1SMat Martineau 45605b155ef9SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) 45618d5a04a1SMat Martineau { 45628d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 45638d5a04a1SMat Martineau 45645b155ef9SMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45658d5a04a1SMat Martineau 45665b155ef9SMat Martineau chan->ident = l2cap_get_ident(chan->conn); 45678d5a04a1SMat Martineau 45685b155ef9SMat Martineau cfm.icid = cpu_to_le16(chan->scid); 45698d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 45708d5a04a1SMat Martineau 45715b155ef9SMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, 45725b155ef9SMat Martineau sizeof(cfm), &cfm); 45735b155ef9SMat Martineau 45745b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 45755b155ef9SMat Martineau } 45765b155ef9SMat Martineau 45775b155ef9SMat Martineau static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) 45785b155ef9SMat Martineau { 45795b155ef9SMat Martineau struct l2cap_move_chan_cfm cfm; 45805b155ef9SMat Martineau 45815b155ef9SMat Martineau BT_DBG("conn %p, icid 0x%4.4x", conn, icid); 45825b155ef9SMat Martineau 45835b155ef9SMat Martineau cfm.icid = cpu_to_le16(icid); 4584dcf4adbfSJoe Perches cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); 45855b155ef9SMat Martineau 45865b155ef9SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, 45875b155ef9SMat Martineau sizeof(cfm), &cfm); 45888d5a04a1SMat Martineau } 45898d5a04a1SMat Martineau 45908d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 45918d5a04a1SMat Martineau u16 icid) 45928d5a04a1SMat Martineau { 45938d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 45948d5a04a1SMat Martineau 4595ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 45968d5a04a1SMat Martineau 45978d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 45988d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 45998d5a04a1SMat Martineau } 46008d5a04a1SMat Martineau 46015f3847a4SMat Martineau static void __release_logical_link(struct l2cap_chan *chan) 46025f3847a4SMat Martineau { 46035f3847a4SMat Martineau chan->hs_hchan = NULL; 46045f3847a4SMat Martineau chan->hs_hcon = NULL; 46055f3847a4SMat Martineau 46065f3847a4SMat Martineau /* Placeholder - release the logical link */ 46075f3847a4SMat Martineau } 46085f3847a4SMat Martineau 46091500109bSMat Martineau static void l2cap_logical_fail(struct l2cap_chan *chan) 46101500109bSMat Martineau { 46111500109bSMat Martineau /* Logical link setup failed */ 46121500109bSMat Martineau if (chan->state != BT_CONNECTED) { 46131500109bSMat Martineau /* Create channel failure, disconnect */ 46145e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 46151500109bSMat Martineau return; 46161500109bSMat Martineau } 46171500109bSMat Martineau 46181500109bSMat Martineau switch (chan->move_role) { 46191500109bSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 46201500109bSMat Martineau l2cap_move_done(chan); 46211500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); 46221500109bSMat Martineau break; 46231500109bSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 46241500109bSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || 46251500109bSMat Martineau chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { 46261500109bSMat Martineau /* Remote has only sent pending or 46271500109bSMat Martineau * success responses, clean up 46281500109bSMat Martineau */ 46291500109bSMat Martineau l2cap_move_done(chan); 46301500109bSMat Martineau } 46311500109bSMat Martineau 46321500109bSMat Martineau /* Other amp move states imply that the move 46331500109bSMat Martineau * has already aborted 46341500109bSMat Martineau */ 46351500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 46361500109bSMat Martineau break; 46371500109bSMat Martineau } 46381500109bSMat Martineau } 46391500109bSMat Martineau 46401500109bSMat Martineau static void l2cap_logical_finish_create(struct l2cap_chan *chan, 46411500109bSMat Martineau struct hci_chan *hchan) 46421500109bSMat Martineau { 46431500109bSMat Martineau struct l2cap_conf_rsp rsp; 46441500109bSMat Martineau 4645336178a3SAndrei Emeltchenko chan->hs_hchan = hchan; 46461500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 46471500109bSMat Martineau 464835ba9561SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); 46491500109bSMat Martineau 46501500109bSMat Martineau if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 4651fe79c6feSAndrei Emeltchenko int err; 46521500109bSMat Martineau 46531500109bSMat Martineau set_default_fcs(chan); 46541500109bSMat Martineau 46551500109bSMat Martineau err = l2cap_ertm_init(chan); 46561500109bSMat Martineau if (err < 0) 46575e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 46581500109bSMat Martineau else 46591500109bSMat Martineau l2cap_chan_ready(chan); 46601500109bSMat Martineau } 46611500109bSMat Martineau } 46621500109bSMat Martineau 46631500109bSMat Martineau static void l2cap_logical_finish_move(struct l2cap_chan *chan, 46641500109bSMat Martineau struct hci_chan *hchan) 46651500109bSMat Martineau { 46661500109bSMat Martineau chan->hs_hcon = hchan->conn; 46671500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 46681500109bSMat Martineau 46691500109bSMat Martineau BT_DBG("move_state %d", chan->move_state); 46701500109bSMat Martineau 46711500109bSMat Martineau switch (chan->move_state) { 46721500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 46731500109bSMat Martineau /* Move confirm will be sent after a success 46741500109bSMat Martineau * response is received 46751500109bSMat Martineau */ 46761500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 46771500109bSMat Martineau break; 46781500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_CFM: 46791500109bSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 46801500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 46811500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 46821500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 46831500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 46841500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 46851500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 46861500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 46871500109bSMat Martineau } 46881500109bSMat Martineau break; 46891500109bSMat Martineau default: 46901500109bSMat Martineau /* Move was not in expected state, free the channel */ 46911500109bSMat Martineau __release_logical_link(chan); 46921500109bSMat Martineau 46931500109bSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 46941500109bSMat Martineau } 46951500109bSMat Martineau } 46961500109bSMat Martineau 46971500109bSMat Martineau /* Call with chan locked */ 469827695fb4SAndrei Emeltchenko void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, 46995b155ef9SMat Martineau u8 status) 47005b155ef9SMat Martineau { 47011500109bSMat Martineau BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); 47021500109bSMat Martineau 47031500109bSMat Martineau if (status) { 47041500109bSMat Martineau l2cap_logical_fail(chan); 47051500109bSMat Martineau __release_logical_link(chan); 47065b155ef9SMat Martineau return; 47075b155ef9SMat Martineau } 47085b155ef9SMat Martineau 47091500109bSMat Martineau if (chan->state != BT_CONNECTED) { 47101500109bSMat Martineau /* Ignore logical link if channel is on BR/EDR */ 47116ed971caSMarcel Holtmann if (chan->local_amp_id != AMP_ID_BREDR) 47121500109bSMat Martineau l2cap_logical_finish_create(chan, hchan); 47131500109bSMat Martineau } else { 47141500109bSMat Martineau l2cap_logical_finish_move(chan, hchan); 47151500109bSMat Martineau } 47161500109bSMat Martineau } 47171500109bSMat Martineau 47183f7a56c4SMat Martineau void l2cap_move_start(struct l2cap_chan *chan) 47193f7a56c4SMat Martineau { 47203f7a56c4SMat Martineau BT_DBG("chan %p", chan); 47213f7a56c4SMat Martineau 47226ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR) { 47233f7a56c4SMat Martineau if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) 47243f7a56c4SMat Martineau return; 47253f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 47263f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 47273f7a56c4SMat Martineau /* Placeholder - start physical link setup */ 47283f7a56c4SMat Martineau } else { 47293f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 47303f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 47313f7a56c4SMat Martineau chan->move_id = 0; 47323f7a56c4SMat Martineau l2cap_move_setup(chan); 47333f7a56c4SMat Martineau l2cap_send_move_chan_req(chan, 0); 47343f7a56c4SMat Martineau } 47353f7a56c4SMat Martineau } 47363f7a56c4SMat Martineau 47378eb200bdSMat Martineau static void l2cap_do_create(struct l2cap_chan *chan, int result, 47388eb200bdSMat Martineau u8 local_amp_id, u8 remote_amp_id) 47398eb200bdSMat Martineau { 474062748ca1SAndrei Emeltchenko BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), 474162748ca1SAndrei Emeltchenko local_amp_id, remote_amp_id); 474262748ca1SAndrei Emeltchenko 474312d6cc60SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 474412d6cc60SAndrei Emeltchenko 474562748ca1SAndrei Emeltchenko /* Outgoing channel on AMP */ 474662748ca1SAndrei Emeltchenko if (chan->state == BT_CONNECT) { 474762748ca1SAndrei Emeltchenko if (result == L2CAP_CR_SUCCESS) { 474862748ca1SAndrei Emeltchenko chan->local_amp_id = local_amp_id; 474962748ca1SAndrei Emeltchenko l2cap_send_create_chan_req(chan, remote_amp_id); 475062748ca1SAndrei Emeltchenko } else { 475162748ca1SAndrei Emeltchenko /* Revert to BR/EDR connect */ 475262748ca1SAndrei Emeltchenko l2cap_send_conn_req(chan); 475362748ca1SAndrei Emeltchenko } 475462748ca1SAndrei Emeltchenko 475562748ca1SAndrei Emeltchenko return; 475662748ca1SAndrei Emeltchenko } 475762748ca1SAndrei Emeltchenko 475862748ca1SAndrei Emeltchenko /* Incoming channel on AMP */ 475962748ca1SAndrei Emeltchenko if (__l2cap_no_conn_pending(chan)) { 47608eb200bdSMat Martineau struct l2cap_conn_rsp rsp; 47618eb200bdSMat Martineau char buf[128]; 47628eb200bdSMat Martineau rsp.scid = cpu_to_le16(chan->dcid); 47638eb200bdSMat Martineau rsp.dcid = cpu_to_le16(chan->scid); 47648eb200bdSMat Martineau 47658eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 47668eb200bdSMat Martineau /* Send successful response */ 4767dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 4768dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 47698eb200bdSMat Martineau } else { 47708eb200bdSMat Martineau /* Send negative response */ 4771dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); 4772dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 47738eb200bdSMat Martineau } 47748eb200bdSMat Martineau 47758eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, 47768eb200bdSMat Martineau sizeof(rsp), &rsp); 47778eb200bdSMat Martineau 47788eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 4779f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 47808eb200bdSMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 47818eb200bdSMat Martineau l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), 47828eb200bdSMat Martineau L2CAP_CONF_REQ, 47838eb200bdSMat Martineau l2cap_build_conf_req(chan, buf), buf); 47848eb200bdSMat Martineau chan->num_conf_req++; 47858eb200bdSMat Martineau } 47868eb200bdSMat Martineau } 47878eb200bdSMat Martineau } 47888eb200bdSMat Martineau 47898eb200bdSMat Martineau static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, 47908eb200bdSMat Martineau u8 remote_amp_id) 47918eb200bdSMat Martineau { 47928eb200bdSMat Martineau l2cap_move_setup(chan); 47938eb200bdSMat Martineau chan->move_id = local_amp_id; 47948eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP; 47958eb200bdSMat Martineau 47968eb200bdSMat Martineau l2cap_send_move_chan_req(chan, remote_amp_id); 47978eb200bdSMat Martineau } 47988eb200bdSMat Martineau 47998eb200bdSMat Martineau static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) 48008eb200bdSMat Martineau { 48018eb200bdSMat Martineau struct hci_chan *hchan = NULL; 48028eb200bdSMat Martineau 48038eb200bdSMat Martineau /* Placeholder - get hci_chan for logical link */ 48048eb200bdSMat Martineau 48058eb200bdSMat Martineau if (hchan) { 48068eb200bdSMat Martineau if (hchan->state == BT_CONNECTED) { 48078eb200bdSMat Martineau /* Logical link is ready to go */ 48088eb200bdSMat Martineau chan->hs_hcon = hchan->conn; 48098eb200bdSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 48108eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 48118eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 48128eb200bdSMat Martineau 48138eb200bdSMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 48148eb200bdSMat Martineau } else { 48158eb200bdSMat Martineau /* Wait for logical link to be ready */ 48168eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 48178eb200bdSMat Martineau } 48188eb200bdSMat Martineau } else { 48198eb200bdSMat Martineau /* Logical link not available */ 48208eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); 48218eb200bdSMat Martineau } 48228eb200bdSMat Martineau } 48238eb200bdSMat Martineau 48248eb200bdSMat Martineau static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) 48258eb200bdSMat Martineau { 48268eb200bdSMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 48278eb200bdSMat Martineau u8 rsp_result; 48288eb200bdSMat Martineau if (result == -EINVAL) 48298eb200bdSMat Martineau rsp_result = L2CAP_MR_BAD_ID; 48308eb200bdSMat Martineau else 48318eb200bdSMat Martineau rsp_result = L2CAP_MR_NOT_ALLOWED; 48328eb200bdSMat Martineau 48338eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, rsp_result); 48348eb200bdSMat Martineau } 48358eb200bdSMat Martineau 48368eb200bdSMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 48378eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 48388eb200bdSMat Martineau 48398eb200bdSMat Martineau /* Restart data transmission */ 48408eb200bdSMat Martineau l2cap_ertm_send(chan); 48418eb200bdSMat Martineau } 48428eb200bdSMat Martineau 4843a514b17fSAndrei Emeltchenko /* Invoke with locked chan */ 4844a514b17fSAndrei Emeltchenko void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) 48458eb200bdSMat Martineau { 4846770bfefaSAndrei Emeltchenko u8 local_amp_id = chan->local_amp_id; 4847fffadc08SAndrei Emeltchenko u8 remote_amp_id = chan->remote_amp_id; 4848770bfefaSAndrei Emeltchenko 48498eb200bdSMat Martineau BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", 48508eb200bdSMat Martineau chan, result, local_amp_id, remote_amp_id); 48518eb200bdSMat Martineau 48528eb200bdSMat Martineau if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { 48538eb200bdSMat Martineau l2cap_chan_unlock(chan); 48548eb200bdSMat Martineau return; 48558eb200bdSMat Martineau } 48568eb200bdSMat Martineau 48578eb200bdSMat Martineau if (chan->state != BT_CONNECTED) { 48588eb200bdSMat Martineau l2cap_do_create(chan, result, local_amp_id, remote_amp_id); 48598eb200bdSMat Martineau } else if (result != L2CAP_MR_SUCCESS) { 48608eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48618eb200bdSMat Martineau } else { 48628eb200bdSMat Martineau switch (chan->move_role) { 48638eb200bdSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 48648eb200bdSMat Martineau l2cap_do_move_initiate(chan, local_amp_id, 48658eb200bdSMat Martineau remote_amp_id); 48668eb200bdSMat Martineau break; 48678eb200bdSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 48688eb200bdSMat Martineau l2cap_do_move_respond(chan, result); 48698eb200bdSMat Martineau break; 48708eb200bdSMat Martineau default: 48718eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48728eb200bdSMat Martineau break; 48738eb200bdSMat Martineau } 48748eb200bdSMat Martineau } 48758eb200bdSMat Martineau } 48768eb200bdSMat Martineau 48778d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4878ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4879ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 48808d5a04a1SMat Martineau { 48818d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 48821500109bSMat Martineau struct l2cap_move_chan_rsp rsp; 488302b0fbb9SMat Martineau struct l2cap_chan *chan; 48848d5a04a1SMat Martineau u16 icid = 0; 48858d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 48868d5a04a1SMat Martineau 48878d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 48888d5a04a1SMat Martineau return -EPROTO; 48898d5a04a1SMat Martineau 48908d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 48918d5a04a1SMat Martineau 4892ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 48938d5a04a1SMat Martineau 48940bd49fc7SJohan Hedberg if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) 48958d5a04a1SMat Martineau return -EINVAL; 48968d5a04a1SMat Martineau 489702b0fbb9SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 489802b0fbb9SMat Martineau if (!chan) { 48991500109bSMat Martineau rsp.icid = cpu_to_le16(icid); 4900dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); 49011500109bSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, 49021500109bSMat Martineau sizeof(rsp), &rsp); 490302b0fbb9SMat Martineau return 0; 490402b0fbb9SMat Martineau } 490502b0fbb9SMat Martineau 49061500109bSMat Martineau chan->ident = cmd->ident; 49071500109bSMat Martineau 490802b0fbb9SMat Martineau if (chan->scid < L2CAP_CID_DYN_START || 490902b0fbb9SMat Martineau chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || 491002b0fbb9SMat Martineau (chan->mode != L2CAP_MODE_ERTM && 491102b0fbb9SMat Martineau chan->mode != L2CAP_MODE_STREAMING)) { 491202b0fbb9SMat Martineau result = L2CAP_MR_NOT_ALLOWED; 491302b0fbb9SMat Martineau goto send_move_response; 491402b0fbb9SMat Martineau } 491502b0fbb9SMat Martineau 491602b0fbb9SMat Martineau if (chan->local_amp_id == req->dest_amp_id) { 491702b0fbb9SMat Martineau result = L2CAP_MR_SAME_ID; 491802b0fbb9SMat Martineau goto send_move_response; 491902b0fbb9SMat Martineau } 492002b0fbb9SMat Martineau 49216ed971caSMarcel Holtmann if (req->dest_amp_id != AMP_ID_BREDR) { 492202b0fbb9SMat Martineau struct hci_dev *hdev; 492302b0fbb9SMat Martineau hdev = hci_dev_get(req->dest_amp_id); 492402b0fbb9SMat Martineau if (!hdev || hdev->dev_type != HCI_AMP || 492502b0fbb9SMat Martineau !test_bit(HCI_UP, &hdev->flags)) { 492602b0fbb9SMat Martineau if (hdev) 492702b0fbb9SMat Martineau hci_dev_put(hdev); 492802b0fbb9SMat Martineau 492902b0fbb9SMat Martineau result = L2CAP_MR_BAD_ID; 493002b0fbb9SMat Martineau goto send_move_response; 493102b0fbb9SMat Martineau } 493202b0fbb9SMat Martineau hci_dev_put(hdev); 493302b0fbb9SMat Martineau } 493402b0fbb9SMat Martineau 493502b0fbb9SMat Martineau /* Detect a move collision. Only send a collision response 493602b0fbb9SMat Martineau * if this side has "lost", otherwise proceed with the move. 493702b0fbb9SMat Martineau * The winner has the larger bd_addr. 493802b0fbb9SMat Martineau */ 493902b0fbb9SMat Martineau if ((__chan_is_moving(chan) || 494002b0fbb9SMat Martineau chan->move_role != L2CAP_MOVE_ROLE_NONE) && 49416f59b904SMarcel Holtmann bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { 494202b0fbb9SMat Martineau result = L2CAP_MR_COLLISION; 494302b0fbb9SMat Martineau goto send_move_response; 494402b0fbb9SMat Martineau } 494502b0fbb9SMat Martineau 494602b0fbb9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 494702b0fbb9SMat Martineau l2cap_move_setup(chan); 494802b0fbb9SMat Martineau chan->move_id = req->dest_amp_id; 494902b0fbb9SMat Martineau icid = chan->dcid; 495002b0fbb9SMat Martineau 49516ed971caSMarcel Holtmann if (req->dest_amp_id == AMP_ID_BREDR) { 495202b0fbb9SMat Martineau /* Moving to BR/EDR */ 495302b0fbb9SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 495402b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 495502b0fbb9SMat Martineau result = L2CAP_MR_PEND; 495602b0fbb9SMat Martineau } else { 495702b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 495802b0fbb9SMat Martineau result = L2CAP_MR_SUCCESS; 495902b0fbb9SMat Martineau } 496002b0fbb9SMat Martineau } else { 496102b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 496202b0fbb9SMat Martineau /* Placeholder - uncomment when amp functions are available */ 496302b0fbb9SMat Martineau /*amp_accept_physical(chan, req->dest_amp_id);*/ 496402b0fbb9SMat Martineau result = L2CAP_MR_PEND; 496502b0fbb9SMat Martineau } 496602b0fbb9SMat Martineau 496702b0fbb9SMat Martineau send_move_response: 49681500109bSMat Martineau l2cap_send_move_chan_rsp(chan, result); 49698d5a04a1SMat Martineau 497002b0fbb9SMat Martineau l2cap_chan_unlock(chan); 497102b0fbb9SMat Martineau 49728d5a04a1SMat Martineau return 0; 49738d5a04a1SMat Martineau } 49748d5a04a1SMat Martineau 49755b155ef9SMat Martineau static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) 49765b155ef9SMat Martineau { 49775b155ef9SMat Martineau struct l2cap_chan *chan; 49785b155ef9SMat Martineau struct hci_chan *hchan = NULL; 49795b155ef9SMat Martineau 49805b155ef9SMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 49815b155ef9SMat Martineau if (!chan) { 49825b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 49835b155ef9SMat Martineau return; 49845b155ef9SMat Martineau } 49855b155ef9SMat Martineau 49865b155ef9SMat Martineau __clear_chan_timer(chan); 49875b155ef9SMat Martineau if (result == L2CAP_MR_PEND) 49885b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); 49895b155ef9SMat Martineau 49905b155ef9SMat Martineau switch (chan->move_state) { 49915b155ef9SMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 49925b155ef9SMat Martineau /* Move confirm will be sent when logical link 49935b155ef9SMat Martineau * is complete. 49945b155ef9SMat Martineau */ 49955b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 49965b155ef9SMat Martineau break; 49975b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP_SUCCESS: 49985b155ef9SMat Martineau if (result == L2CAP_MR_PEND) { 49995b155ef9SMat Martineau break; 50005b155ef9SMat Martineau } else if (test_bit(CONN_LOCAL_BUSY, 50015b155ef9SMat Martineau &chan->conn_state)) { 50025b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 50035b155ef9SMat Martineau } else { 50045b155ef9SMat Martineau /* Logical link is up or moving to BR/EDR, 50055b155ef9SMat Martineau * proceed with move 50065b155ef9SMat Martineau */ 50075b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 50085b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 50095b155ef9SMat Martineau } 50105b155ef9SMat Martineau break; 50115b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP: 50125b155ef9SMat Martineau /* Moving to AMP */ 50135b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 50145b155ef9SMat Martineau /* Remote is ready, send confirm immediately 50155b155ef9SMat Martineau * after logical link is ready 50165b155ef9SMat Martineau */ 50175b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 50185b155ef9SMat Martineau } else { 50195b155ef9SMat Martineau /* Both logical link and move success 50205b155ef9SMat Martineau * are required to confirm 50215b155ef9SMat Martineau */ 50225b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; 50235b155ef9SMat Martineau } 50245b155ef9SMat Martineau 50255b155ef9SMat Martineau /* Placeholder - get hci_chan for logical link */ 50265b155ef9SMat Martineau if (!hchan) { 50275b155ef9SMat Martineau /* Logical link not available */ 50285b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50295b155ef9SMat Martineau break; 50305b155ef9SMat Martineau } 50315b155ef9SMat Martineau 50325b155ef9SMat Martineau /* If the logical link is not yet connected, do not 50335b155ef9SMat Martineau * send confirmation. 50345b155ef9SMat Martineau */ 50355b155ef9SMat Martineau if (hchan->state != BT_CONNECTED) 50365b155ef9SMat Martineau break; 50375b155ef9SMat Martineau 50385b155ef9SMat Martineau /* Logical link is already ready to go */ 50395b155ef9SMat Martineau 50405b155ef9SMat Martineau chan->hs_hcon = hchan->conn; 50415b155ef9SMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 50425b155ef9SMat Martineau 50435b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 50445b155ef9SMat Martineau /* Can confirm now */ 50455b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 50465b155ef9SMat Martineau } else { 50475b155ef9SMat Martineau /* Now only need move success 50485b155ef9SMat Martineau * to confirm 50495b155ef9SMat Martineau */ 50505b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 50515b155ef9SMat Martineau } 50525b155ef9SMat Martineau 50535b155ef9SMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 50545b155ef9SMat Martineau break; 50555b155ef9SMat Martineau default: 50565b155ef9SMat Martineau /* Any other amp move state means the move failed. */ 50575b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 50585b155ef9SMat Martineau l2cap_move_done(chan); 50595b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50605b155ef9SMat Martineau } 50615b155ef9SMat Martineau 50625b155ef9SMat Martineau l2cap_chan_unlock(chan); 50635b155ef9SMat Martineau } 50645b155ef9SMat Martineau 50655b155ef9SMat Martineau static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, 50665b155ef9SMat Martineau u16 result) 50675b155ef9SMat Martineau { 50685b155ef9SMat Martineau struct l2cap_chan *chan; 50695b155ef9SMat Martineau 50705b155ef9SMat Martineau chan = l2cap_get_chan_by_ident(conn, ident); 50715b155ef9SMat Martineau if (!chan) { 50725b155ef9SMat Martineau /* Could not locate channel, icid is best guess */ 50735b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 50745b155ef9SMat Martineau return; 50755b155ef9SMat Martineau } 50765b155ef9SMat Martineau 50775b155ef9SMat Martineau __clear_chan_timer(chan); 50785b155ef9SMat Martineau 50795b155ef9SMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 50805b155ef9SMat Martineau if (result == L2CAP_MR_COLLISION) { 50815b155ef9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 50825b155ef9SMat Martineau } else { 50835b155ef9SMat Martineau /* Cleanup - cancel move */ 50845b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 50855b155ef9SMat Martineau l2cap_move_done(chan); 50865b155ef9SMat Martineau } 50875b155ef9SMat Martineau } 50885b155ef9SMat Martineau 50895b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50905b155ef9SMat Martineau 50915b155ef9SMat Martineau l2cap_chan_unlock(chan); 50925b155ef9SMat Martineau } 50935b155ef9SMat Martineau 50945b155ef9SMat Martineau static int l2cap_move_channel_rsp(struct l2cap_conn *conn, 5095ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5096ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 50978d5a04a1SMat Martineau { 50988d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 50998d5a04a1SMat Martineau u16 icid, result; 51008d5a04a1SMat Martineau 51018d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 51028d5a04a1SMat Martineau return -EPROTO; 51038d5a04a1SMat Martineau 51048d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 51058d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 51068d5a04a1SMat Martineau 5107ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 51088d5a04a1SMat Martineau 51095b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) 51105b155ef9SMat Martineau l2cap_move_continue(conn, icid, result); 51115b155ef9SMat Martineau else 51125b155ef9SMat Martineau l2cap_move_fail(conn, cmd->ident, icid, result); 51138d5a04a1SMat Martineau 51148d5a04a1SMat Martineau return 0; 51158d5a04a1SMat Martineau } 51168d5a04a1SMat Martineau 51175f3847a4SMat Martineau static int l2cap_move_channel_confirm(struct l2cap_conn *conn, 5118ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5119ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51208d5a04a1SMat Martineau { 51218d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 51225f3847a4SMat Martineau struct l2cap_chan *chan; 51238d5a04a1SMat Martineau u16 icid, result; 51248d5a04a1SMat Martineau 51258d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 51268d5a04a1SMat Martineau return -EPROTO; 51278d5a04a1SMat Martineau 51288d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 51298d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 51308d5a04a1SMat Martineau 5131ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 51328d5a04a1SMat Martineau 51335f3847a4SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 51345f3847a4SMat Martineau if (!chan) { 51355f3847a4SMat Martineau /* Spec requires a response even if the icid was not found */ 51368d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 51375f3847a4SMat Martineau return 0; 51385f3847a4SMat Martineau } 51395f3847a4SMat Martineau 51405f3847a4SMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { 51415f3847a4SMat Martineau if (result == L2CAP_MC_CONFIRMED) { 51425f3847a4SMat Martineau chan->local_amp_id = chan->move_id; 51436ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR) 51445f3847a4SMat Martineau __release_logical_link(chan); 51455f3847a4SMat Martineau } else { 51465f3847a4SMat Martineau chan->move_id = chan->local_amp_id; 51475f3847a4SMat Martineau } 51485f3847a4SMat Martineau 51495f3847a4SMat Martineau l2cap_move_done(chan); 51505f3847a4SMat Martineau } 51515f3847a4SMat Martineau 51525f3847a4SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 51535f3847a4SMat Martineau 51545f3847a4SMat Martineau l2cap_chan_unlock(chan); 51558d5a04a1SMat Martineau 51568d5a04a1SMat Martineau return 0; 51578d5a04a1SMat Martineau } 51588d5a04a1SMat Martineau 51598d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 5160ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5161ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51628d5a04a1SMat Martineau { 51638d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 51643fd71a0aSMat Martineau struct l2cap_chan *chan; 51658d5a04a1SMat Martineau u16 icid; 51668d5a04a1SMat Martineau 51678d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 51688d5a04a1SMat Martineau return -EPROTO; 51698d5a04a1SMat Martineau 51708d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 51718d5a04a1SMat Martineau 5172ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 51738d5a04a1SMat Martineau 51743fd71a0aSMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 51753fd71a0aSMat Martineau if (!chan) 51763fd71a0aSMat Martineau return 0; 51773fd71a0aSMat Martineau 51783fd71a0aSMat Martineau __clear_chan_timer(chan); 51793fd71a0aSMat Martineau 51803fd71a0aSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { 51813fd71a0aSMat Martineau chan->local_amp_id = chan->move_id; 51823fd71a0aSMat Martineau 51836ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) 51843fd71a0aSMat Martineau __release_logical_link(chan); 51853fd71a0aSMat Martineau 51863fd71a0aSMat Martineau l2cap_move_done(chan); 51873fd71a0aSMat Martineau } 51883fd71a0aSMat Martineau 51893fd71a0aSMat Martineau l2cap_chan_unlock(chan); 51903fd71a0aSMat Martineau 51918d5a04a1SMat Martineau return 0; 51928d5a04a1SMat Martineau } 51938d5a04a1SMat Martineau 5194de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 51952d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 5196203e639eSJohan Hedberg u16 cmd_len, u8 *data) 5197de73115aSClaudio Takahasi { 5198de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 5199de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 5200de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 5201203e639eSJohan Hedberg u16 min, max, latency, to_multiplier; 52022ce603ebSClaudio Takahasi int err; 5203de73115aSClaudio Takahasi 520440bef302SJohan Hedberg if (hcon->role != HCI_ROLE_MASTER) 5205de73115aSClaudio Takahasi return -EINVAL; 5206de73115aSClaudio Takahasi 5207de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 5208de73115aSClaudio Takahasi return -EPROTO; 5209de73115aSClaudio Takahasi 5210de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 5211de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 5212de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 5213de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 5214de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 5215de73115aSClaudio Takahasi 5216de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 5217de73115aSClaudio Takahasi min, max, latency, to_multiplier); 5218de73115aSClaudio Takahasi 5219de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 52202ce603ebSClaudio Takahasi 5221d4905f24SAndre Guedes err = hci_check_conn_params(min, max, latency, to_multiplier); 52222ce603ebSClaudio Takahasi if (err) 5223dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 5224de73115aSClaudio Takahasi else 5225dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 5226de73115aSClaudio Takahasi 5227de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 5228de73115aSClaudio Takahasi sizeof(rsp), &rsp); 5229de73115aSClaudio Takahasi 5230ffb5a827SAndre Guedes if (!err) { 5231f4869e2aSJohan Hedberg u8 store_hint; 5232ffb5a827SAndre Guedes 5233f4869e2aSJohan Hedberg store_hint = hci_le_conn_update(hcon, min, max, latency, 5234f4869e2aSJohan Hedberg to_multiplier); 5235f4869e2aSJohan Hedberg mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, 5236f4869e2aSJohan Hedberg store_hint, min, max, latency, 5237f4869e2aSJohan Hedberg to_multiplier); 5238f4869e2aSJohan Hedberg 5239ffb5a827SAndre Guedes } 52402ce603ebSClaudio Takahasi 5241de73115aSClaudio Takahasi return 0; 5242de73115aSClaudio Takahasi } 5243de73115aSClaudio Takahasi 5244f1496deeSJohan Hedberg static int l2cap_le_connect_rsp(struct l2cap_conn *conn, 5245f1496deeSJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5246f1496deeSJohan Hedberg u8 *data) 5247f1496deeSJohan Hedberg { 5248f1496deeSJohan Hedberg struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; 52493e64b7bdSJohan Hedberg struct hci_conn *hcon = conn->hcon; 5250f1496deeSJohan Hedberg u16 dcid, mtu, mps, credits, result; 5251f1496deeSJohan Hedberg struct l2cap_chan *chan; 52523e64b7bdSJohan Hedberg int err, sec_level; 5253f1496deeSJohan Hedberg 5254f1496deeSJohan Hedberg if (cmd_len < sizeof(*rsp)) 5255f1496deeSJohan Hedberg return -EPROTO; 5256f1496deeSJohan Hedberg 5257f1496deeSJohan Hedberg dcid = __le16_to_cpu(rsp->dcid); 5258f1496deeSJohan Hedberg mtu = __le16_to_cpu(rsp->mtu); 5259f1496deeSJohan Hedberg mps = __le16_to_cpu(rsp->mps); 5260f1496deeSJohan Hedberg credits = __le16_to_cpu(rsp->credits); 5261f1496deeSJohan Hedberg result = __le16_to_cpu(rsp->result); 5262f1496deeSJohan Hedberg 526340624183SJohan Hedberg if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 || 526440624183SJohan Hedberg dcid < L2CAP_CID_DYN_START || 526540624183SJohan Hedberg dcid > L2CAP_CID_LE_DYN_END)) 5266f1496deeSJohan Hedberg return -EPROTO; 5267f1496deeSJohan Hedberg 5268f1496deeSJohan Hedberg BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", 5269f1496deeSJohan Hedberg dcid, mtu, mps, credits, result); 5270f1496deeSJohan Hedberg 5271f1496deeSJohan Hedberg mutex_lock(&conn->chan_lock); 5272f1496deeSJohan Hedberg 5273f1496deeSJohan Hedberg chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 5274f1496deeSJohan Hedberg if (!chan) { 5275f1496deeSJohan Hedberg err = -EBADSLT; 5276f1496deeSJohan Hedberg goto unlock; 5277f1496deeSJohan Hedberg } 5278f1496deeSJohan Hedberg 5279f1496deeSJohan Hedberg err = 0; 5280f1496deeSJohan Hedberg 5281f1496deeSJohan Hedberg l2cap_chan_lock(chan); 5282f1496deeSJohan Hedberg 5283f1496deeSJohan Hedberg switch (result) { 5284f1496deeSJohan Hedberg case L2CAP_CR_SUCCESS: 528540624183SJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, dcid)) { 528640624183SJohan Hedberg err = -EBADSLT; 528740624183SJohan Hedberg break; 528840624183SJohan Hedberg } 528940624183SJohan Hedberg 5290f1496deeSJohan Hedberg chan->ident = 0; 5291f1496deeSJohan Hedberg chan->dcid = dcid; 5292f1496deeSJohan Hedberg chan->omtu = mtu; 5293f1496deeSJohan Hedberg chan->remote_mps = mps; 52940cd75f7eSJohan Hedberg chan->tx_credits = credits; 5295f1496deeSJohan Hedberg l2cap_chan_ready(chan); 5296f1496deeSJohan Hedberg break; 5297f1496deeSJohan Hedberg 52983e64b7bdSJohan Hedberg case L2CAP_CR_AUTHENTICATION: 52993e64b7bdSJohan Hedberg case L2CAP_CR_ENCRYPTION: 53003e64b7bdSJohan Hedberg /* If we already have MITM protection we can't do 53013e64b7bdSJohan Hedberg * anything. 53023e64b7bdSJohan Hedberg */ 53033e64b7bdSJohan Hedberg if (hcon->sec_level > BT_SECURITY_MEDIUM) { 53043e64b7bdSJohan Hedberg l2cap_chan_del(chan, ECONNREFUSED); 53053e64b7bdSJohan Hedberg break; 53063e64b7bdSJohan Hedberg } 53073e64b7bdSJohan Hedberg 53083e64b7bdSJohan Hedberg sec_level = hcon->sec_level + 1; 53093e64b7bdSJohan Hedberg if (chan->sec_level < sec_level) 53103e64b7bdSJohan Hedberg chan->sec_level = sec_level; 53113e64b7bdSJohan Hedberg 53123e64b7bdSJohan Hedberg /* We'll need to send a new Connect Request */ 53133e64b7bdSJohan Hedberg clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags); 53143e64b7bdSJohan Hedberg 53153e64b7bdSJohan Hedberg smp_conn_security(hcon, chan->sec_level); 53163e64b7bdSJohan Hedberg break; 53173e64b7bdSJohan Hedberg 5318f1496deeSJohan Hedberg default: 5319f1496deeSJohan Hedberg l2cap_chan_del(chan, ECONNREFUSED); 5320f1496deeSJohan Hedberg break; 5321f1496deeSJohan Hedberg } 5322f1496deeSJohan Hedberg 5323f1496deeSJohan Hedberg l2cap_chan_unlock(chan); 5324f1496deeSJohan Hedberg 5325f1496deeSJohan Hedberg unlock: 5326f1496deeSJohan Hedberg mutex_unlock(&conn->chan_lock); 5327f1496deeSJohan Hedberg 5328f1496deeSJohan Hedberg return err; 5329f1496deeSJohan Hedberg } 5330f1496deeSJohan Hedberg 53313300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 53322d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 53332d792818SGustavo Padovan u8 *data) 53343300d9a9SClaudio Takahasi { 53353300d9a9SClaudio Takahasi int err = 0; 53363300d9a9SClaudio Takahasi 53373300d9a9SClaudio Takahasi switch (cmd->code) { 53383300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 5339cb3b3152SJohan Hedberg l2cap_command_rej(conn, cmd, cmd_len, data); 53403300d9a9SClaudio Takahasi break; 53413300d9a9SClaudio Takahasi 53423300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 5343cb3b3152SJohan Hedberg err = l2cap_connect_req(conn, cmd, cmd_len, data); 53443300d9a9SClaudio Takahasi break; 53453300d9a9SClaudio Takahasi 53463300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 5347f5a2598dSMat Martineau case L2CAP_CREATE_CHAN_RSP: 53489245e737SJohan Hedberg l2cap_connect_create_rsp(conn, cmd, cmd_len, data); 53493300d9a9SClaudio Takahasi break; 53503300d9a9SClaudio Takahasi 53513300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 53523300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 53533300d9a9SClaudio Takahasi break; 53543300d9a9SClaudio Takahasi 53553300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 53569245e737SJohan Hedberg l2cap_config_rsp(conn, cmd, cmd_len, data); 53573300d9a9SClaudio Takahasi break; 53583300d9a9SClaudio Takahasi 53593300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 5360cb3b3152SJohan Hedberg err = l2cap_disconnect_req(conn, cmd, cmd_len, data); 53613300d9a9SClaudio Takahasi break; 53623300d9a9SClaudio Takahasi 53633300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 53649245e737SJohan Hedberg l2cap_disconnect_rsp(conn, cmd, cmd_len, data); 53653300d9a9SClaudio Takahasi break; 53663300d9a9SClaudio Takahasi 53673300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 53683300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 53693300d9a9SClaudio Takahasi break; 53703300d9a9SClaudio Takahasi 53713300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 53723300d9a9SClaudio Takahasi break; 53733300d9a9SClaudio Takahasi 53743300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 5375cb3b3152SJohan Hedberg err = l2cap_information_req(conn, cmd, cmd_len, data); 53763300d9a9SClaudio Takahasi break; 53773300d9a9SClaudio Takahasi 53783300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 53799245e737SJohan Hedberg l2cap_information_rsp(conn, cmd, cmd_len, data); 53803300d9a9SClaudio Takahasi break; 53813300d9a9SClaudio Takahasi 5382f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 5383f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 5384f94ff6ffSMat Martineau break; 5385f94ff6ffSMat Martineau 53868d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 53878d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 53888d5a04a1SMat Martineau break; 53898d5a04a1SMat Martineau 53908d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 53919245e737SJohan Hedberg l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 53928d5a04a1SMat Martineau break; 53938d5a04a1SMat Martineau 53948d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 53958d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 53968d5a04a1SMat Martineau break; 53978d5a04a1SMat Martineau 53988d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 53999245e737SJohan Hedberg l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 54008d5a04a1SMat Martineau break; 54018d5a04a1SMat Martineau 54023300d9a9SClaudio Takahasi default: 54033300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 54043300d9a9SClaudio Takahasi err = -EINVAL; 54053300d9a9SClaudio Takahasi break; 54063300d9a9SClaudio Takahasi } 54073300d9a9SClaudio Takahasi 54083300d9a9SClaudio Takahasi return err; 54093300d9a9SClaudio Takahasi } 54103300d9a9SClaudio Takahasi 541127e2d4c8SJohan Hedberg static int l2cap_le_connect_req(struct l2cap_conn *conn, 541227e2d4c8SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 541327e2d4c8SJohan Hedberg u8 *data) 541427e2d4c8SJohan Hedberg { 541527e2d4c8SJohan Hedberg struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; 541627e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 541727e2d4c8SJohan Hedberg struct l2cap_chan *chan, *pchan; 54180cd75f7eSJohan Hedberg u16 dcid, scid, credits, mtu, mps; 541927e2d4c8SJohan Hedberg __le16 psm; 542027e2d4c8SJohan Hedberg u8 result; 542127e2d4c8SJohan Hedberg 542227e2d4c8SJohan Hedberg if (cmd_len != sizeof(*req)) 542327e2d4c8SJohan Hedberg return -EPROTO; 542427e2d4c8SJohan Hedberg 542527e2d4c8SJohan Hedberg scid = __le16_to_cpu(req->scid); 542627e2d4c8SJohan Hedberg mtu = __le16_to_cpu(req->mtu); 542727e2d4c8SJohan Hedberg mps = __le16_to_cpu(req->mps); 542827e2d4c8SJohan Hedberg psm = req->psm; 542927e2d4c8SJohan Hedberg dcid = 0; 54300cd75f7eSJohan Hedberg credits = 0; 543127e2d4c8SJohan Hedberg 543227e2d4c8SJohan Hedberg if (mtu < 23 || mps < 23) 543327e2d4c8SJohan Hedberg return -EPROTO; 543427e2d4c8SJohan Hedberg 543527e2d4c8SJohan Hedberg BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), 543627e2d4c8SJohan Hedberg scid, mtu, mps); 543727e2d4c8SJohan Hedberg 543827e2d4c8SJohan Hedberg /* Check if we have socket listening on psm */ 543927e2d4c8SJohan Hedberg pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, 544027e2d4c8SJohan Hedberg &conn->hcon->dst, LE_LINK); 544127e2d4c8SJohan Hedberg if (!pchan) { 544227e2d4c8SJohan Hedberg result = L2CAP_CR_BAD_PSM; 544327e2d4c8SJohan Hedberg chan = NULL; 544427e2d4c8SJohan Hedberg goto response; 544527e2d4c8SJohan Hedberg } 544627e2d4c8SJohan Hedberg 544727e2d4c8SJohan Hedberg mutex_lock(&conn->chan_lock); 544827e2d4c8SJohan Hedberg l2cap_chan_lock(pchan); 544927e2d4c8SJohan Hedberg 545035dc6f83SJohan Hedberg if (!smp_sufficient_security(conn->hcon, pchan->sec_level, 545135dc6f83SJohan Hedberg SMP_ALLOW_STK)) { 545227e2d4c8SJohan Hedberg result = L2CAP_CR_AUTHENTICATION; 545327e2d4c8SJohan Hedberg chan = NULL; 545427e2d4c8SJohan Hedberg goto response_unlock; 545527e2d4c8SJohan Hedberg } 545627e2d4c8SJohan Hedberg 54578a7889ccSJohan Hedberg /* Check for valid dynamic CID range */ 54588a7889ccSJohan Hedberg if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) { 54598a7889ccSJohan Hedberg result = L2CAP_CR_INVALID_SCID; 54608a7889ccSJohan Hedberg chan = NULL; 54618a7889ccSJohan Hedberg goto response_unlock; 54628a7889ccSJohan Hedberg } 54638a7889ccSJohan Hedberg 546427e2d4c8SJohan Hedberg /* Check if we already have channel with that dcid */ 546527e2d4c8SJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, scid)) { 54668a7889ccSJohan Hedberg result = L2CAP_CR_SCID_IN_USE; 546727e2d4c8SJohan Hedberg chan = NULL; 546827e2d4c8SJohan Hedberg goto response_unlock; 546927e2d4c8SJohan Hedberg } 547027e2d4c8SJohan Hedberg 547127e2d4c8SJohan Hedberg chan = pchan->ops->new_connection(pchan); 547227e2d4c8SJohan Hedberg if (!chan) { 547327e2d4c8SJohan Hedberg result = L2CAP_CR_NO_MEM; 547427e2d4c8SJohan Hedberg goto response_unlock; 547527e2d4c8SJohan Hedberg } 547627e2d4c8SJohan Hedberg 54770ce43ce6SJohan Hedberg l2cap_le_flowctl_init(chan); 54780ce43ce6SJohan Hedberg 547927e2d4c8SJohan Hedberg bacpy(&chan->src, &conn->hcon->src); 548027e2d4c8SJohan Hedberg bacpy(&chan->dst, &conn->hcon->dst); 5481a250e048SJohan Hedberg chan->src_type = bdaddr_src_type(conn->hcon); 5482a250e048SJohan Hedberg chan->dst_type = bdaddr_dst_type(conn->hcon); 548327e2d4c8SJohan Hedberg chan->psm = psm; 548427e2d4c8SJohan Hedberg chan->dcid = scid; 548527e2d4c8SJohan Hedberg chan->omtu = mtu; 548627e2d4c8SJohan Hedberg chan->remote_mps = mps; 54870cd75f7eSJohan Hedberg chan->tx_credits = __le16_to_cpu(req->credits); 548827e2d4c8SJohan Hedberg 548927e2d4c8SJohan Hedberg __l2cap_chan_add(conn, chan); 549027e2d4c8SJohan Hedberg dcid = chan->scid; 54910cd75f7eSJohan Hedberg credits = chan->rx_credits; 549227e2d4c8SJohan Hedberg 549327e2d4c8SJohan Hedberg __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 549427e2d4c8SJohan Hedberg 549527e2d4c8SJohan Hedberg chan->ident = cmd->ident; 549627e2d4c8SJohan Hedberg 549727e2d4c8SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 549827e2d4c8SJohan Hedberg l2cap_state_change(chan, BT_CONNECT2); 5499434714dcSJohan Hedberg /* The following result value is actually not defined 5500434714dcSJohan Hedberg * for LE CoC but we use it to let the function know 5501434714dcSJohan Hedberg * that it should bail out after doing its cleanup 5502434714dcSJohan Hedberg * instead of sending a response. 5503434714dcSJohan Hedberg */ 550427e2d4c8SJohan Hedberg result = L2CAP_CR_PEND; 550527e2d4c8SJohan Hedberg chan->ops->defer(chan); 550627e2d4c8SJohan Hedberg } else { 550727e2d4c8SJohan Hedberg l2cap_chan_ready(chan); 550827e2d4c8SJohan Hedberg result = L2CAP_CR_SUCCESS; 550927e2d4c8SJohan Hedberg } 551027e2d4c8SJohan Hedberg 551127e2d4c8SJohan Hedberg response_unlock: 551227e2d4c8SJohan Hedberg l2cap_chan_unlock(pchan); 551327e2d4c8SJohan Hedberg mutex_unlock(&conn->chan_lock); 5514a24cce14SJohan Hedberg l2cap_chan_put(pchan); 551527e2d4c8SJohan Hedberg 551627e2d4c8SJohan Hedberg if (result == L2CAP_CR_PEND) 551727e2d4c8SJohan Hedberg return 0; 551827e2d4c8SJohan Hedberg 551927e2d4c8SJohan Hedberg response: 552027e2d4c8SJohan Hedberg if (chan) { 552127e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 55223916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 552327e2d4c8SJohan Hedberg } else { 552427e2d4c8SJohan Hedberg rsp.mtu = 0; 552527e2d4c8SJohan Hedberg rsp.mps = 0; 552627e2d4c8SJohan Hedberg } 552727e2d4c8SJohan Hedberg 552827e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(dcid); 55290cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(credits); 553027e2d4c8SJohan Hedberg rsp.result = cpu_to_le16(result); 553127e2d4c8SJohan Hedberg 553227e2d4c8SJohan Hedberg l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); 553327e2d4c8SJohan Hedberg 553427e2d4c8SJohan Hedberg return 0; 553527e2d4c8SJohan Hedberg } 553627e2d4c8SJohan Hedberg 5537fad5fc89SJohan Hedberg static inline int l2cap_le_credits(struct l2cap_conn *conn, 5538fad5fc89SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5539fad5fc89SJohan Hedberg u8 *data) 5540fad5fc89SJohan Hedberg { 5541fad5fc89SJohan Hedberg struct l2cap_le_credits *pkt; 5542fad5fc89SJohan Hedberg struct l2cap_chan *chan; 55430f1bfe4eSJohan Hedberg u16 cid, credits, max_credits; 5544fad5fc89SJohan Hedberg 5545fad5fc89SJohan Hedberg if (cmd_len != sizeof(*pkt)) 5546fad5fc89SJohan Hedberg return -EPROTO; 5547fad5fc89SJohan Hedberg 5548fad5fc89SJohan Hedberg pkt = (struct l2cap_le_credits *) data; 5549fad5fc89SJohan Hedberg cid = __le16_to_cpu(pkt->cid); 5550fad5fc89SJohan Hedberg credits = __le16_to_cpu(pkt->credits); 5551fad5fc89SJohan Hedberg 5552fad5fc89SJohan Hedberg BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); 5553fad5fc89SJohan Hedberg 5554fad5fc89SJohan Hedberg chan = l2cap_get_chan_by_dcid(conn, cid); 5555fad5fc89SJohan Hedberg if (!chan) 5556fad5fc89SJohan Hedberg return -EBADSLT; 5557fad5fc89SJohan Hedberg 55580f1bfe4eSJohan Hedberg max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; 55590f1bfe4eSJohan Hedberg if (credits > max_credits) { 55600f1bfe4eSJohan Hedberg BT_ERR("LE credits overflow"); 55610f1bfe4eSJohan Hedberg l2cap_send_disconn_req(chan, ECONNRESET); 5562ee93053dSMartin Townsend l2cap_chan_unlock(chan); 55630f1bfe4eSJohan Hedberg 55640f1bfe4eSJohan Hedberg /* Return 0 so that we don't trigger an unnecessary 55650f1bfe4eSJohan Hedberg * command reject packet. 55660f1bfe4eSJohan Hedberg */ 55670f1bfe4eSJohan Hedberg return 0; 55680f1bfe4eSJohan Hedberg } 55690f1bfe4eSJohan Hedberg 5570fad5fc89SJohan Hedberg chan->tx_credits += credits; 5571fad5fc89SJohan Hedberg 5572fad5fc89SJohan Hedberg while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { 5573fad5fc89SJohan Hedberg l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); 5574fad5fc89SJohan Hedberg chan->tx_credits--; 5575fad5fc89SJohan Hedberg } 5576fad5fc89SJohan Hedberg 5577fad5fc89SJohan Hedberg if (chan->tx_credits) 5578fad5fc89SJohan Hedberg chan->ops->resume(chan); 5579fad5fc89SJohan Hedberg 5580fad5fc89SJohan Hedberg l2cap_chan_unlock(chan); 5581fad5fc89SJohan Hedberg 5582fad5fc89SJohan Hedberg return 0; 5583fad5fc89SJohan Hedberg } 5584fad5fc89SJohan Hedberg 558571fb4197SJohan Hedberg static inline int l2cap_le_command_rej(struct l2cap_conn *conn, 558671fb4197SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 558771fb4197SJohan Hedberg u8 *data) 558871fb4197SJohan Hedberg { 558971fb4197SJohan Hedberg struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 559071fb4197SJohan Hedberg struct l2cap_chan *chan; 559171fb4197SJohan Hedberg 559271fb4197SJohan Hedberg if (cmd_len < sizeof(*rej)) 559371fb4197SJohan Hedberg return -EPROTO; 559471fb4197SJohan Hedberg 559571fb4197SJohan Hedberg mutex_lock(&conn->chan_lock); 559671fb4197SJohan Hedberg 559771fb4197SJohan Hedberg chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 559871fb4197SJohan Hedberg if (!chan) 559971fb4197SJohan Hedberg goto done; 560071fb4197SJohan Hedberg 560171fb4197SJohan Hedberg l2cap_chan_lock(chan); 560271fb4197SJohan Hedberg l2cap_chan_del(chan, ECONNREFUSED); 560371fb4197SJohan Hedberg l2cap_chan_unlock(chan); 560471fb4197SJohan Hedberg 560571fb4197SJohan Hedberg done: 560671fb4197SJohan Hedberg mutex_unlock(&conn->chan_lock); 560771fb4197SJohan Hedberg return 0; 560871fb4197SJohan Hedberg } 560971fb4197SJohan Hedberg 56103300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 5611203e639eSJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5612203e639eSJohan Hedberg u8 *data) 56133300d9a9SClaudio Takahasi { 5614b5ecba64SJohan Hedberg int err = 0; 5615b5ecba64SJohan Hedberg 56163300d9a9SClaudio Takahasi switch (cmd->code) { 56173300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 561871fb4197SJohan Hedberg l2cap_le_command_rej(conn, cmd, cmd_len, data); 5619b5ecba64SJohan Hedberg break; 56203300d9a9SClaudio Takahasi 56213300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 5622b5ecba64SJohan Hedberg err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); 5623b5ecba64SJohan Hedberg break; 56243300d9a9SClaudio Takahasi 56253300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 5626b5ecba64SJohan Hedberg break; 56273300d9a9SClaudio Takahasi 5628f1496deeSJohan Hedberg case L2CAP_LE_CONN_RSP: 5629f1496deeSJohan Hedberg l2cap_le_connect_rsp(conn, cmd, cmd_len, data); 5630b5ecba64SJohan Hedberg break; 5631f1496deeSJohan Hedberg 563227e2d4c8SJohan Hedberg case L2CAP_LE_CONN_REQ: 5633b5ecba64SJohan Hedberg err = l2cap_le_connect_req(conn, cmd, cmd_len, data); 5634b5ecba64SJohan Hedberg break; 563527e2d4c8SJohan Hedberg 5636fad5fc89SJohan Hedberg case L2CAP_LE_CREDITS: 5637fad5fc89SJohan Hedberg err = l2cap_le_credits(conn, cmd, cmd_len, data); 5638fad5fc89SJohan Hedberg break; 5639fad5fc89SJohan Hedberg 56403defe01aSJohan Hedberg case L2CAP_DISCONN_REQ: 5641b5ecba64SJohan Hedberg err = l2cap_disconnect_req(conn, cmd, cmd_len, data); 5642b5ecba64SJohan Hedberg break; 56433defe01aSJohan Hedberg 56443defe01aSJohan Hedberg case L2CAP_DISCONN_RSP: 56453defe01aSJohan Hedberg l2cap_disconnect_rsp(conn, cmd, cmd_len, data); 5646b5ecba64SJohan Hedberg break; 56473defe01aSJohan Hedberg 56483300d9a9SClaudio Takahasi default: 56493300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 5650b5ecba64SJohan Hedberg err = -EINVAL; 5651b5ecba64SJohan Hedberg break; 56523300d9a9SClaudio Takahasi } 5653b5ecba64SJohan Hedberg 5654b5ecba64SJohan Hedberg return err; 56553300d9a9SClaudio Takahasi } 56563300d9a9SClaudio Takahasi 5657c5623556SJohan Hedberg static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, 5658c5623556SJohan Hedberg struct sk_buff *skb) 5659c5623556SJohan Hedberg { 566069c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 56614f3e219dSMarcel Holtmann struct l2cap_cmd_hdr *cmd; 56624f3e219dSMarcel Holtmann u16 len; 5663c5623556SJohan Hedberg int err; 5664c5623556SJohan Hedberg 566569c4e4e8SJohan Hedberg if (hcon->type != LE_LINK) 56663b166295SMarcel Holtmann goto drop; 566769c4e4e8SJohan Hedberg 56684f3e219dSMarcel Holtmann if (skb->len < L2CAP_CMD_HDR_SIZE) 56694f3e219dSMarcel Holtmann goto drop; 5670c5623556SJohan Hedberg 56714f3e219dSMarcel Holtmann cmd = (void *) skb->data; 56724f3e219dSMarcel Holtmann skb_pull(skb, L2CAP_CMD_HDR_SIZE); 5673c5623556SJohan Hedberg 56744f3e219dSMarcel Holtmann len = le16_to_cpu(cmd->len); 5675c5623556SJohan Hedberg 56764f3e219dSMarcel Holtmann BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); 56774f3e219dSMarcel Holtmann 56784f3e219dSMarcel Holtmann if (len != skb->len || !cmd->ident) { 5679c5623556SJohan Hedberg BT_DBG("corrupted command"); 56804f3e219dSMarcel Holtmann goto drop; 5681c5623556SJohan Hedberg } 5682c5623556SJohan Hedberg 5683203e639eSJohan Hedberg err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); 5684c5623556SJohan Hedberg if (err) { 5685c5623556SJohan Hedberg struct l2cap_cmd_rej_unk rej; 5686c5623556SJohan Hedberg 5687c5623556SJohan Hedberg BT_ERR("Wrong link type (%d)", err); 5688c5623556SJohan Hedberg 5689dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 56904f3e219dSMarcel Holtmann l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 5691c5623556SJohan Hedberg sizeof(rej), &rej); 5692c5623556SJohan Hedberg } 5693c5623556SJohan Hedberg 56943b166295SMarcel Holtmann drop: 5695c5623556SJohan Hedberg kfree_skb(skb); 5696c5623556SJohan Hedberg } 5697c5623556SJohan Hedberg 56983300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 56993300d9a9SClaudio Takahasi struct sk_buff *skb) 57000a708f8fSGustavo F. Padovan { 570169c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 57020a708f8fSGustavo F. Padovan u8 *data = skb->data; 57030a708f8fSGustavo F. Padovan int len = skb->len; 57040a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 57053300d9a9SClaudio Takahasi int err; 57060a708f8fSGustavo F. Padovan 57070a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 57080a708f8fSGustavo F. Padovan 570969c4e4e8SJohan Hedberg if (hcon->type != ACL_LINK) 57103b166295SMarcel Holtmann goto drop; 571169c4e4e8SJohan Hedberg 57120a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 57130a708f8fSGustavo F. Padovan u16 cmd_len; 57140a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 57150a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 57160a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 57170a708f8fSGustavo F. Padovan 57180a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 57190a708f8fSGustavo F. Padovan 57202d792818SGustavo Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 57212d792818SGustavo Padovan cmd.ident); 57220a708f8fSGustavo F. Padovan 57230a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 57240a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 57250a708f8fSGustavo F. Padovan break; 57260a708f8fSGustavo F. Padovan } 57270a708f8fSGustavo F. Padovan 57283300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 57290a708f8fSGustavo F. Padovan if (err) { 5730e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 57312c6d1a2eSGustavo F. Padovan 57322c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 57330a708f8fSGustavo F. Padovan 5734dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 57352d792818SGustavo Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 57362d792818SGustavo Padovan sizeof(rej), &rej); 57370a708f8fSGustavo F. Padovan } 57380a708f8fSGustavo F. Padovan 57390a708f8fSGustavo F. Padovan data += cmd_len; 57400a708f8fSGustavo F. Padovan len -= cmd_len; 57410a708f8fSGustavo F. Padovan } 57420a708f8fSGustavo F. Padovan 57433b166295SMarcel Holtmann drop: 57440a708f8fSGustavo F. Padovan kfree_skb(skb); 57450a708f8fSGustavo F. Padovan } 57460a708f8fSGustavo F. Padovan 574747d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 57480a708f8fSGustavo F. Padovan { 57490a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 5750e4ca6d98SAndrei Emeltchenko int hdr_size; 5751e4ca6d98SAndrei Emeltchenko 5752e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 5753e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 5754e4ca6d98SAndrei Emeltchenko else 5755e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 57560a708f8fSGustavo F. Padovan 575747d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 575803a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 57590a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 57600a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 57610a708f8fSGustavo F. Padovan 57620a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 57630a708f8fSGustavo F. Padovan return -EBADMSG; 57640a708f8fSGustavo F. Padovan } 57650a708f8fSGustavo F. Padovan return 0; 57660a708f8fSGustavo F. Padovan } 57670a708f8fSGustavo F. Padovan 57686ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 57690a708f8fSGustavo F. Padovan { 5770e31f7633SMat Martineau struct l2cap_ctrl control; 57710a708f8fSGustavo F. Padovan 5772e31f7633SMat Martineau BT_DBG("chan %p", chan); 57730a708f8fSGustavo F. Padovan 5774e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 5775e31f7633SMat Martineau control.sframe = 1; 5776e31f7633SMat Martineau control.final = 1; 5777e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 5778e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 57790a708f8fSGustavo F. Padovan 5780e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5781e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 5782e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 57830a708f8fSGustavo F. Padovan } 57840a708f8fSGustavo F. Padovan 5785e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 5786e31f7633SMat Martineau chan->unacked_frames > 0) 5787e31f7633SMat Martineau __set_retrans_timer(chan); 57880a708f8fSGustavo F. Padovan 5789e31f7633SMat Martineau /* Send pending iframes */ 5790525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 57910a708f8fSGustavo F. Padovan 5792e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 5793e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 5794e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 5795e31f7633SMat Martineau * send it now. 5796e31f7633SMat Martineau */ 5797e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 5798e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 57990a708f8fSGustavo F. Padovan } 58000a708f8fSGustavo F. Padovan } 58010a708f8fSGustavo F. Padovan 58022d792818SGustavo Padovan static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, 58032d792818SGustavo Padovan struct sk_buff **last_frag) 58040a708f8fSGustavo F. Padovan { 580584084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 580684084a31SMat Martineau * skb->data_len reflects only data in fragments 580784084a31SMat Martineau */ 580884084a31SMat Martineau if (!skb_has_frag_list(skb)) 580984084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 581084084a31SMat Martineau 581184084a31SMat Martineau new_frag->next = NULL; 581284084a31SMat Martineau 581384084a31SMat Martineau (*last_frag)->next = new_frag; 581484084a31SMat Martineau *last_frag = new_frag; 581584084a31SMat Martineau 581684084a31SMat Martineau skb->len += new_frag->len; 581784084a31SMat Martineau skb->data_len += new_frag->len; 581884084a31SMat Martineau skb->truesize += new_frag->truesize; 581984084a31SMat Martineau } 582084084a31SMat Martineau 58214b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 58224b51dae9SMat Martineau struct l2cap_ctrl *control) 582384084a31SMat Martineau { 582484084a31SMat Martineau int err = -EINVAL; 58250a708f8fSGustavo F. Padovan 58264b51dae9SMat Martineau switch (control->sar) { 58277e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 582884084a31SMat Martineau if (chan->sdu) 582984084a31SMat Martineau break; 58300a708f8fSGustavo F. Padovan 583180b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 583284084a31SMat Martineau break; 58330a708f8fSGustavo F. Padovan 58347e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 583584084a31SMat Martineau if (chan->sdu) 583684084a31SMat Martineau break; 58370a708f8fSGustavo F. Padovan 58386f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 583903a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 58400a708f8fSGustavo F. Padovan 584184084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 584284084a31SMat Martineau err = -EMSGSIZE; 584384084a31SMat Martineau break; 584484084a31SMat Martineau } 58450a708f8fSGustavo F. Padovan 584684084a31SMat Martineau if (skb->len >= chan->sdu_len) 584784084a31SMat Martineau break; 584884084a31SMat Martineau 584984084a31SMat Martineau chan->sdu = skb; 585084084a31SMat Martineau chan->sdu_last_frag = skb; 585184084a31SMat Martineau 585284084a31SMat Martineau skb = NULL; 585384084a31SMat Martineau err = 0; 58540a708f8fSGustavo F. Padovan break; 58550a708f8fSGustavo F. Padovan 58567e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 58576f61fd47SGustavo F. Padovan if (!chan->sdu) 585884084a31SMat Martineau break; 58590a708f8fSGustavo F. Padovan 586084084a31SMat Martineau append_skb_frag(chan->sdu, skb, 586184084a31SMat Martineau &chan->sdu_last_frag); 586284084a31SMat Martineau skb = NULL; 58630a708f8fSGustavo F. Padovan 586484084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 586584084a31SMat Martineau break; 58660a708f8fSGustavo F. Padovan 586784084a31SMat Martineau err = 0; 58680a708f8fSGustavo F. Padovan break; 58690a708f8fSGustavo F. Padovan 58707e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 58716f61fd47SGustavo F. Padovan if (!chan->sdu) 587284084a31SMat Martineau break; 58730a708f8fSGustavo F. Padovan 587484084a31SMat Martineau append_skb_frag(chan->sdu, skb, 587584084a31SMat Martineau &chan->sdu_last_frag); 587684084a31SMat Martineau skb = NULL; 58770a708f8fSGustavo F. Padovan 587884084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 587984084a31SMat Martineau break; 58800a708f8fSGustavo F. Padovan 588180b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 58820a708f8fSGustavo F. Padovan 588384084a31SMat Martineau if (!err) { 588484084a31SMat Martineau /* Reassembly complete */ 588584084a31SMat Martineau chan->sdu = NULL; 588684084a31SMat Martineau chan->sdu_last_frag = NULL; 588784084a31SMat Martineau chan->sdu_len = 0; 58880a708f8fSGustavo F. Padovan } 58890a708f8fSGustavo F. Padovan break; 58900a708f8fSGustavo F. Padovan } 58910a708f8fSGustavo F. Padovan 589284084a31SMat Martineau if (err) { 58930a708f8fSGustavo F. Padovan kfree_skb(skb); 58946f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 58956f61fd47SGustavo F. Padovan chan->sdu = NULL; 589684084a31SMat Martineau chan->sdu_last_frag = NULL; 589784084a31SMat Martineau chan->sdu_len = 0; 589884084a31SMat Martineau } 58990a708f8fSGustavo F. Padovan 590084084a31SMat Martineau return err; 59010a708f8fSGustavo F. Padovan } 59020a708f8fSGustavo F. Padovan 590332b32735SMat Martineau static int l2cap_resegment(struct l2cap_chan *chan) 590432b32735SMat Martineau { 590532b32735SMat Martineau /* Placeholder */ 590632b32735SMat Martineau return 0; 590732b32735SMat Martineau } 590832b32735SMat Martineau 5909e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 59100a708f8fSGustavo F. Padovan { 591161aa4f5bSMat Martineau u8 event; 591261aa4f5bSMat Martineau 591361aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 591461aa4f5bSMat Martineau return; 591561aa4f5bSMat Martineau 591661aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 5917401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 59180a708f8fSGustavo F. Padovan } 59190a708f8fSGustavo F. Padovan 5920d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 5921d2a7ac5dSMat Martineau { 592263838725SMat Martineau int err = 0; 592363838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 592463838725SMat Martineau * until a gap is encountered. 592563838725SMat Martineau */ 592663838725SMat Martineau 592763838725SMat Martineau BT_DBG("chan %p", chan); 592863838725SMat Martineau 592963838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 593063838725SMat Martineau struct sk_buff *skb; 593163838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 593263838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 593363838725SMat Martineau 593463838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 593563838725SMat Martineau 593663838725SMat Martineau if (!skb) 593763838725SMat Martineau break; 593863838725SMat Martineau 593963838725SMat Martineau skb_unlink(skb, &chan->srej_q); 594063838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 5941a4368ff3SJohan Hedberg err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap); 594263838725SMat Martineau if (err) 594363838725SMat Martineau break; 594463838725SMat Martineau } 594563838725SMat Martineau 594663838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 594763838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 594863838725SMat Martineau l2cap_send_ack(chan); 594963838725SMat Martineau } 595063838725SMat Martineau 595163838725SMat Martineau return err; 5952d2a7ac5dSMat Martineau } 5953d2a7ac5dSMat Martineau 5954d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 5955d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5956d2a7ac5dSMat Martineau { 5957f80842a8SMat Martineau struct sk_buff *skb; 5958f80842a8SMat Martineau 5959f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 5960f80842a8SMat Martineau 5961f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 5962f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 59635e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5964f80842a8SMat Martineau return; 5965f80842a8SMat Martineau } 5966f80842a8SMat Martineau 5967f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5968f80842a8SMat Martineau 5969f80842a8SMat Martineau if (skb == NULL) { 5970f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 5971f80842a8SMat Martineau control->reqseq); 5972f80842a8SMat Martineau return; 5973f80842a8SMat Martineau } 5974f80842a8SMat Martineau 5975a4368ff3SJohan Hedberg if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) { 5976f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 59775e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5978f80842a8SMat Martineau return; 5979f80842a8SMat Martineau } 5980f80842a8SMat Martineau 5981f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5982f80842a8SMat Martineau 5983f80842a8SMat Martineau if (control->poll) { 5984f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 5985f80842a8SMat Martineau 5986f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5987f80842a8SMat Martineau l2cap_retransmit(chan, control); 5988f80842a8SMat Martineau l2cap_ertm_send(chan); 5989f80842a8SMat Martineau 5990f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5991f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5992f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5993f80842a8SMat Martineau } 5994f80842a8SMat Martineau } else { 5995f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 5996f80842a8SMat Martineau 5997f80842a8SMat Martineau if (control->final) { 5998f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 5999f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 6000f80842a8SMat Martineau &chan->conn_state)) 6001f80842a8SMat Martineau l2cap_retransmit(chan, control); 6002f80842a8SMat Martineau } else { 6003f80842a8SMat Martineau l2cap_retransmit(chan, control); 6004f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 6005f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 6006f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 6007f80842a8SMat Martineau } 6008f80842a8SMat Martineau } 6009f80842a8SMat Martineau } 6010d2a7ac5dSMat Martineau } 6011d2a7ac5dSMat Martineau 6012d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 6013d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 6014d2a7ac5dSMat Martineau { 6015fcd289dfSMat Martineau struct sk_buff *skb; 6016fcd289dfSMat Martineau 6017fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 6018fcd289dfSMat Martineau 6019fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 6020fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 60215e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6022fcd289dfSMat Martineau return; 6023fcd289dfSMat Martineau } 6024fcd289dfSMat Martineau 6025fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 6026fcd289dfSMat Martineau 6027fcd289dfSMat Martineau if (chan->max_tx && skb && 6028a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.retries >= chan->max_tx) { 6029fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 60305e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6031fcd289dfSMat Martineau return; 6032fcd289dfSMat Martineau } 6033fcd289dfSMat Martineau 6034fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6035fcd289dfSMat Martineau 6036fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 6037fcd289dfSMat Martineau 6038fcd289dfSMat Martineau if (control->final) { 6039fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 6040fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 6041fcd289dfSMat Martineau } else { 6042fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 6043fcd289dfSMat Martineau l2cap_ertm_send(chan); 6044fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 6045fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 6046fcd289dfSMat Martineau } 6047d2a7ac5dSMat Martineau } 6048d2a7ac5dSMat Martineau 60494b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 60504b51dae9SMat Martineau { 60514b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 60524b51dae9SMat Martineau 60534b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 60544b51dae9SMat Martineau chan->expected_tx_seq); 60554b51dae9SMat Martineau 60564b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 60574b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 60584b51dae9SMat Martineau chan->tx_win) { 60594b51dae9SMat Martineau /* See notes below regarding "double poll" and 60604b51dae9SMat Martineau * invalid packets. 60614b51dae9SMat Martineau */ 60624b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 60634b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 60644b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 60654b51dae9SMat Martineau } else { 60664b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 60674b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 60684b51dae9SMat Martineau } 60694b51dae9SMat Martineau } 60704b51dae9SMat Martineau 60714b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 60724b51dae9SMat Martineau BT_DBG("Expected SREJ"); 60734b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 60744b51dae9SMat Martineau } 60754b51dae9SMat Martineau 60764b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 60774b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 60784b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 60794b51dae9SMat Martineau } 60804b51dae9SMat Martineau 60814b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 60824b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 60834b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 60844b51dae9SMat Martineau } 60854b51dae9SMat Martineau } 60864b51dae9SMat Martineau 60874b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 60884b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 60894b51dae9SMat Martineau chan->tx_win) { 60904b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 60914b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 60924b51dae9SMat Martineau } else { 60934b51dae9SMat Martineau BT_DBG("Expected"); 60944b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 60954b51dae9SMat Martineau } 60964b51dae9SMat Martineau } 60974b51dae9SMat Martineau 60984b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 60992d792818SGustavo Padovan __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { 61004b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 61014b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 61024b51dae9SMat Martineau } 61034b51dae9SMat Martineau 61044b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 61054b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 61064b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 61074b51dae9SMat Martineau * the remote stack receives and processes both polls, 61084b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 61094b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 61104b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 61114b51dae9SMat Martineau * request. 61124b51dae9SMat Martineau * 61134b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 61144b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 61154b51dae9SMat Martineau * invalid frames to be safely ignored. 61164b51dae9SMat Martineau * 61174b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 61184b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 61194b51dae9SMat Martineau * causes a disconnect. 61204b51dae9SMat Martineau */ 61214b51dae9SMat Martineau 61224b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 61234b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 61244b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 61254b51dae9SMat Martineau } else { 61264b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 61274b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 61284b51dae9SMat Martineau } 61294b51dae9SMat Martineau } else { 61304b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 61314b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 61324b51dae9SMat Martineau } 61334b51dae9SMat Martineau } 61344b51dae9SMat Martineau 6135d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 6136d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 6137d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 6138d2a7ac5dSMat Martineau { 6139d2a7ac5dSMat Martineau int err = 0; 6140941247f9SPeter Senna Tschudin bool skb_in_use = false; 6141d2a7ac5dSMat Martineau 6142d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 6143d2a7ac5dSMat Martineau event); 6144d2a7ac5dSMat Martineau 6145d2a7ac5dSMat Martineau switch (event) { 6146d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 6147d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 6148d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 6149d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6150d2a7ac5dSMat Martineau 6151d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 6152d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 6153d2a7ac5dSMat Martineau control->txseq); 6154d2a7ac5dSMat Martineau break; 6155d2a7ac5dSMat Martineau } 6156d2a7ac5dSMat Martineau 6157d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 6158d2a7ac5dSMat Martineau control->txseq); 6159d2a7ac5dSMat Martineau 6160d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 6161941247f9SPeter Senna Tschudin skb_in_use = true; 6162d2a7ac5dSMat Martineau 6163d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 6164d2a7ac5dSMat Martineau if (err) 6165d2a7ac5dSMat Martineau break; 6166d2a7ac5dSMat Martineau 6167d2a7ac5dSMat Martineau if (control->final) { 6168d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 6169d2a7ac5dSMat Martineau &chan->conn_state)) { 6170d2a7ac5dSMat Martineau control->final = 0; 6171d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6172d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6173d2a7ac5dSMat Martineau } 6174d2a7ac5dSMat Martineau } 6175d2a7ac5dSMat Martineau 6176d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 6177d2a7ac5dSMat Martineau l2cap_send_ack(chan); 6178d2a7ac5dSMat Martineau break; 6179d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 6180d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6181d2a7ac5dSMat Martineau 6182d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 6183d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 6184d2a7ac5dSMat Martineau * when local busy is exited. 6185d2a7ac5dSMat Martineau */ 6186d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 6187d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 6188d2a7ac5dSMat Martineau control->txseq); 6189d2a7ac5dSMat Martineau break; 6190d2a7ac5dSMat Martineau } 6191d2a7ac5dSMat Martineau 6192d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 6193d2a7ac5dSMat Martineau * must be sent for each missing frame. The 6194d2a7ac5dSMat Martineau * current frame is stored for later use. 6195d2a7ac5dSMat Martineau */ 6196d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6197941247f9SPeter Senna Tschudin skb_in_use = true; 6198d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6199d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6200d2a7ac5dSMat Martineau 6201d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 6202d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 6203d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 6204d2a7ac5dSMat Martineau 6205d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 6206d2a7ac5dSMat Martineau break; 6207d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 6208d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6209d2a7ac5dSMat Martineau break; 6210d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 6211d2a7ac5dSMat Martineau break; 6212d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 6213d2a7ac5dSMat Martineau default: 62145e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6215d2a7ac5dSMat Martineau break; 6216d2a7ac5dSMat Martineau } 6217d2a7ac5dSMat Martineau break; 6218d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 6219d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6220d2a7ac5dSMat Martineau if (control->final) { 6221d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6222d2a7ac5dSMat Martineau 6223e6a3ee6eSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && 6224e6a3ee6eSMat Martineau !__chan_is_moving(chan)) { 6225d2a7ac5dSMat Martineau control->final = 0; 6226d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6227d2a7ac5dSMat Martineau } 6228d2a7ac5dSMat Martineau 6229d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6230d2a7ac5dSMat Martineau } else if (control->poll) { 6231d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 6232d2a7ac5dSMat Martineau } else { 6233d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6234d2a7ac5dSMat Martineau &chan->conn_state) && 6235d2a7ac5dSMat Martineau chan->unacked_frames) 6236d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6237d2a7ac5dSMat Martineau 6238d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6239d2a7ac5dSMat Martineau } 6240d2a7ac5dSMat Martineau break; 6241d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 6242d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6243d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6244d2a7ac5dSMat Martineau if (control && control->poll) { 6245d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 6246d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 6247d2a7ac5dSMat Martineau } 6248d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 6249d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 6250d2a7ac5dSMat Martineau break; 6251d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 6252d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 6253d2a7ac5dSMat Martineau break; 6254d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 6255d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 6256d2a7ac5dSMat Martineau break; 6257d2a7ac5dSMat Martineau default: 6258d2a7ac5dSMat Martineau break; 6259d2a7ac5dSMat Martineau } 6260d2a7ac5dSMat Martineau 6261d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 6262d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 6263d2a7ac5dSMat Martineau kfree_skb(skb); 6264d2a7ac5dSMat Martineau } 6265d2a7ac5dSMat Martineau 6266d2a7ac5dSMat Martineau return err; 6267d2a7ac5dSMat Martineau } 6268d2a7ac5dSMat Martineau 6269d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 6270d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 6271d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 6272d2a7ac5dSMat Martineau { 6273d2a7ac5dSMat Martineau int err = 0; 6274d2a7ac5dSMat Martineau u16 txseq = control->txseq; 6275941247f9SPeter Senna Tschudin bool skb_in_use = false; 6276d2a7ac5dSMat Martineau 6277d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 6278d2a7ac5dSMat Martineau event); 6279d2a7ac5dSMat Martineau 6280d2a7ac5dSMat Martineau switch (event) { 6281d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 6282d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 6283d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 6284d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 6285d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6286d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6287941247f9SPeter Senna Tschudin skb_in_use = true; 6288d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6289d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6290d2a7ac5dSMat Martineau 6291d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 6292d2a7ac5dSMat Martineau break; 6293d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 6294d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 6295d2a7ac5dSMat Martineau 6296d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6297d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6298941247f9SPeter Senna Tschudin skb_in_use = true; 6299d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6300d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6301d2a7ac5dSMat Martineau 6302d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 6303d2a7ac5dSMat Martineau if (err) 6304d2a7ac5dSMat Martineau break; 6305d2a7ac5dSMat Martineau 6306d2a7ac5dSMat Martineau break; 6307d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 6308d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 6309d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 6310d2a7ac5dSMat Martineau * the missing frames. 6311d2a7ac5dSMat Martineau */ 6312d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6313941247f9SPeter Senna Tschudin skb_in_use = true; 6314d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6315d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6316d2a7ac5dSMat Martineau 6317d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6318d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 6319d2a7ac5dSMat Martineau break; 6320d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 6321d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 6322d2a7ac5dSMat Martineau * some expected retransmitted frames are 6323d2a7ac5dSMat Martineau * missing. Request retransmission of missing 6324d2a7ac5dSMat Martineau * SREJ'd frames. 6325d2a7ac5dSMat Martineau */ 6326d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6327941247f9SPeter Senna Tschudin skb_in_use = true; 6328d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6329d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6330d2a7ac5dSMat Martineau 6331d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6332d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 6333d2a7ac5dSMat Martineau break; 6334d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 6335d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 6336d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6337d2a7ac5dSMat Martineau break; 6338d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 6339d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 6340d2a7ac5dSMat Martineau * was already received. Ignore it completely. 6341d2a7ac5dSMat Martineau */ 6342d2a7ac5dSMat Martineau break; 6343d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 6344d2a7ac5dSMat Martineau break; 6345d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 6346d2a7ac5dSMat Martineau default: 63475e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6348d2a7ac5dSMat Martineau break; 6349d2a7ac5dSMat Martineau } 6350d2a7ac5dSMat Martineau break; 6351d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 6352d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6353d2a7ac5dSMat Martineau if (control->final) { 6354d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6355d2a7ac5dSMat Martineau 6356d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 6357d2a7ac5dSMat Martineau &chan->conn_state)) { 6358d2a7ac5dSMat Martineau control->final = 0; 6359d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6360d2a7ac5dSMat Martineau } 6361d2a7ac5dSMat Martineau 6362d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6363d2a7ac5dSMat Martineau } else if (control->poll) { 6364d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6365d2a7ac5dSMat Martineau &chan->conn_state) && 6366d2a7ac5dSMat Martineau chan->unacked_frames) { 6367d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6368d2a7ac5dSMat Martineau } 6369d2a7ac5dSMat Martineau 6370d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 6371d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6372d2a7ac5dSMat Martineau } else { 6373d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6374d2a7ac5dSMat Martineau &chan->conn_state) && 6375d2a7ac5dSMat Martineau chan->unacked_frames) 6376d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6377d2a7ac5dSMat Martineau 6378d2a7ac5dSMat Martineau l2cap_send_ack(chan); 6379d2a7ac5dSMat Martineau } 6380d2a7ac5dSMat Martineau break; 6381d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 6382d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6383d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6384d2a7ac5dSMat Martineau if (control->poll) { 6385d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6386d2a7ac5dSMat Martineau } else { 6387d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 6388d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 6389d2a7ac5dSMat Martineau rr_control.sframe = 1; 6390d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 6391d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 6392d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 6393d2a7ac5dSMat Martineau } 6394d2a7ac5dSMat Martineau 6395d2a7ac5dSMat Martineau break; 6396d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 6397d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 6398d2a7ac5dSMat Martineau break; 6399d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 6400d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 6401d2a7ac5dSMat Martineau break; 6402d2a7ac5dSMat Martineau } 6403d2a7ac5dSMat Martineau 6404d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 6405d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 6406d2a7ac5dSMat Martineau kfree_skb(skb); 6407d2a7ac5dSMat Martineau } 6408d2a7ac5dSMat Martineau 6409d2a7ac5dSMat Martineau return err; 6410d2a7ac5dSMat Martineau } 6411d2a7ac5dSMat Martineau 641232b32735SMat Martineau static int l2cap_finish_move(struct l2cap_chan *chan) 641332b32735SMat Martineau { 641432b32735SMat Martineau BT_DBG("chan %p", chan); 641532b32735SMat Martineau 641632b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 641732b32735SMat Martineau 641832b32735SMat Martineau if (chan->hs_hcon) 641932b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 642032b32735SMat Martineau else 642132b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 642232b32735SMat Martineau 642332b32735SMat Martineau return l2cap_resegment(chan); 642432b32735SMat Martineau } 642532b32735SMat Martineau 642632b32735SMat Martineau static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, 642732b32735SMat Martineau struct l2cap_ctrl *control, 642832b32735SMat Martineau struct sk_buff *skb, u8 event) 642932b32735SMat Martineau { 643032b32735SMat Martineau int err; 643132b32735SMat Martineau 643232b32735SMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 643332b32735SMat Martineau event); 643432b32735SMat Martineau 643532b32735SMat Martineau if (!control->poll) 643632b32735SMat Martineau return -EPROTO; 643732b32735SMat Martineau 643832b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 643932b32735SMat Martineau 644032b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 644132b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 644232b32735SMat Martineau else 644332b32735SMat Martineau chan->tx_send_head = NULL; 644432b32735SMat Martineau 644532b32735SMat Martineau /* Rewind next_tx_seq to the point expected 644632b32735SMat Martineau * by the receiver. 644732b32735SMat Martineau */ 644832b32735SMat Martineau chan->next_tx_seq = control->reqseq; 644932b32735SMat Martineau chan->unacked_frames = 0; 645032b32735SMat Martineau 645132b32735SMat Martineau err = l2cap_finish_move(chan); 645232b32735SMat Martineau if (err) 645332b32735SMat Martineau return err; 645432b32735SMat Martineau 645532b32735SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 645632b32735SMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 645732b32735SMat Martineau 645832b32735SMat Martineau if (event == L2CAP_EV_RECV_IFRAME) 645932b32735SMat Martineau return -EPROTO; 646032b32735SMat Martineau 646132b32735SMat Martineau return l2cap_rx_state_recv(chan, control, NULL, event); 646232b32735SMat Martineau } 646332b32735SMat Martineau 646432b32735SMat Martineau static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, 646532b32735SMat Martineau struct l2cap_ctrl *control, 646632b32735SMat Martineau struct sk_buff *skb, u8 event) 646732b32735SMat Martineau { 646832b32735SMat Martineau int err; 646932b32735SMat Martineau 647032b32735SMat Martineau if (!control->final) 647132b32735SMat Martineau return -EPROTO; 647232b32735SMat Martineau 647332b32735SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 647432b32735SMat Martineau 647532b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 647632b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 647732b32735SMat Martineau 647832b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 647932b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 648032b32735SMat Martineau else 648132b32735SMat Martineau chan->tx_send_head = NULL; 648232b32735SMat Martineau 648332b32735SMat Martineau /* Rewind next_tx_seq to the point expected 648432b32735SMat Martineau * by the receiver. 648532b32735SMat Martineau */ 648632b32735SMat Martineau chan->next_tx_seq = control->reqseq; 648732b32735SMat Martineau chan->unacked_frames = 0; 648832b32735SMat Martineau 648932b32735SMat Martineau if (chan->hs_hcon) 649032b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 649132b32735SMat Martineau else 649232b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 649332b32735SMat Martineau 649432b32735SMat Martineau err = l2cap_resegment(chan); 649532b32735SMat Martineau 649632b32735SMat Martineau if (!err) 649732b32735SMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 649832b32735SMat Martineau 649932b32735SMat Martineau return err; 650032b32735SMat Martineau } 650132b32735SMat Martineau 6502d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 6503d2a7ac5dSMat Martineau { 6504d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 6505d2a7ac5dSMat Martineau u16 unacked; 6506d2a7ac5dSMat Martineau 6507d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 6508d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 6509d2a7ac5dSMat Martineau } 6510d2a7ac5dSMat Martineau 6511cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6512cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 65130a708f8fSGustavo F. Padovan { 6514d2a7ac5dSMat Martineau int err = 0; 6515d2a7ac5dSMat Martineau 6516d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 6517d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 6518d2a7ac5dSMat Martineau 6519d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 6520d2a7ac5dSMat Martineau switch (chan->rx_state) { 6521d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 6522d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 6523d2a7ac5dSMat Martineau break; 6524d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 6525d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 6526d2a7ac5dSMat Martineau event); 6527d2a7ac5dSMat Martineau break; 652832b32735SMat Martineau case L2CAP_RX_STATE_WAIT_P: 652932b32735SMat Martineau err = l2cap_rx_state_wait_p(chan, control, skb, event); 653032b32735SMat Martineau break; 653132b32735SMat Martineau case L2CAP_RX_STATE_WAIT_F: 653232b32735SMat Martineau err = l2cap_rx_state_wait_f(chan, control, skb, event); 653332b32735SMat Martineau break; 6534d2a7ac5dSMat Martineau default: 6535d2a7ac5dSMat Martineau /* shut it down */ 6536d2a7ac5dSMat Martineau break; 6537d2a7ac5dSMat Martineau } 6538d2a7ac5dSMat Martineau } else { 6539d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 6540d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 6541d2a7ac5dSMat Martineau chan->expected_ack_seq); 65425e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6543d2a7ac5dSMat Martineau } 6544d2a7ac5dSMat Martineau 6545d2a7ac5dSMat Martineau return err; 6546cec8ab6eSMat Martineau } 6547cec8ab6eSMat Martineau 6548cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6549cec8ab6eSMat Martineau struct sk_buff *skb) 6550cec8ab6eSMat Martineau { 65514b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 65524b51dae9SMat Martineau chan->rx_state); 65534b51dae9SMat Martineau 65544b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 65554b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 65564b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 65574b51dae9SMat Martineau 65584b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 65594b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 65604b51dae9SMat Martineau 65614b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 65624b51dae9SMat Martineau 65634b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 65644b51dae9SMat Martineau } else { 65654b51dae9SMat Martineau if (chan->sdu) { 65664b51dae9SMat Martineau kfree_skb(chan->sdu); 65674b51dae9SMat Martineau chan->sdu = NULL; 65684b51dae9SMat Martineau } 65694b51dae9SMat Martineau chan->sdu_last_frag = NULL; 65704b51dae9SMat Martineau chan->sdu_len = 0; 65714b51dae9SMat Martineau 65724b51dae9SMat Martineau if (skb) { 65734b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 65744b51dae9SMat Martineau kfree_skb(skb); 65754b51dae9SMat Martineau } 65764b51dae9SMat Martineau } 65774b51dae9SMat Martineau 65784b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 65794b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 65804b51dae9SMat Martineau 65819a544210SPrasanna Karthik return 0; 6582cec8ab6eSMat Martineau } 6583cec8ab6eSMat Martineau 6584cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6585cec8ab6eSMat Martineau { 6586a4368ff3SJohan Hedberg struct l2cap_ctrl *control = &bt_cb(skb)->l2cap; 6587cec8ab6eSMat Martineau u16 len; 6588cec8ab6eSMat Martineau u8 event; 65890a708f8fSGustavo F. Padovan 6590b76bbd66SMat Martineau __unpack_control(chan, skb); 6591b76bbd66SMat Martineau 65920a708f8fSGustavo F. Padovan len = skb->len; 65930a708f8fSGustavo F. Padovan 65940a708f8fSGustavo F. Padovan /* 65950a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 65960a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 6597cec8ab6eSMat Martineau * procedures and ask for retransmission. 65980a708f8fSGustavo F. Padovan */ 659947d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 66000a708f8fSGustavo F. Padovan goto drop; 66010a708f8fSGustavo F. Padovan 6602cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 660303a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 66040a708f8fSGustavo F. Padovan 660547d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 660603a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 66070a708f8fSGustavo F. Padovan 660847d1ec61SGustavo F. Padovan if (len > chan->mps) { 66095e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 66100a708f8fSGustavo F. Padovan goto drop; 66110a708f8fSGustavo F. Padovan } 66120a708f8fSGustavo F. Padovan 6613cec8ab6eSMat Martineau if (!control->sframe) { 6614cec8ab6eSMat Martineau int err; 66150a708f8fSGustavo F. Padovan 6616cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 6617cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 6618cec8ab6eSMat Martineau control->txseq); 6619836be934SAndrei Emeltchenko 6620cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 6621cec8ab6eSMat Martineau * valid in TX WAIT_F 6622cec8ab6eSMat Martineau */ 6623cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 66240a708f8fSGustavo F. Padovan goto drop; 66250a708f8fSGustavo F. Padovan 6626cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 6627cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 6628cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 66290a708f8fSGustavo F. Padovan } else { 6630cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 6631cec8ab6eSMat Martineau } 6632cec8ab6eSMat Martineau 6633cec8ab6eSMat Martineau if (err) 66345e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6635cec8ab6eSMat Martineau } else { 6636cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 6637cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 6638cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 6639cec8ab6eSMat Martineau }; 6640cec8ab6eSMat Martineau 6641cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 6642cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 6643cec8ab6eSMat Martineau goto drop; 6644cec8ab6eSMat Martineau 6645cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 6646cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 6647cec8ab6eSMat Martineau control->super); 6648cec8ab6eSMat Martineau 66490a708f8fSGustavo F. Padovan if (len != 0) { 66501bb166e6SAndrei Emeltchenko BT_ERR("Trailing bytes: %d in sframe", len); 66515e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 66520a708f8fSGustavo F. Padovan goto drop; 66530a708f8fSGustavo F. Padovan } 66540a708f8fSGustavo F. Padovan 6655cec8ab6eSMat Martineau /* Validate F and P bits */ 6656cec8ab6eSMat Martineau if (control->final && (control->poll || 6657cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 6658cec8ab6eSMat Martineau goto drop; 6659cec8ab6eSMat Martineau 6660cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 6661cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 66625e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 66630a708f8fSGustavo F. Padovan } 66640a708f8fSGustavo F. Padovan 66650a708f8fSGustavo F. Padovan return 0; 66660a708f8fSGustavo F. Padovan 66670a708f8fSGustavo F. Padovan drop: 66680a708f8fSGustavo F. Padovan kfree_skb(skb); 66690a708f8fSGustavo F. Padovan return 0; 66700a708f8fSGustavo F. Padovan } 66710a708f8fSGustavo F. Padovan 6672b1c325c2SJohan Hedberg static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) 6673b1c325c2SJohan Hedberg { 6674b1c325c2SJohan Hedberg struct l2cap_conn *conn = chan->conn; 6675b1c325c2SJohan Hedberg struct l2cap_le_credits pkt; 6676b1c325c2SJohan Hedberg u16 return_credits; 6677b1c325c2SJohan Hedberg 6678b1c325c2SJohan Hedberg /* We return more credits to the sender only after the amount of 6679b1c325c2SJohan Hedberg * credits falls below half of the initial amount. 6680b1c325c2SJohan Hedberg */ 6681f15b8ecfSJohan Hedberg if (chan->rx_credits >= (le_max_credits + 1) / 2) 6682b1c325c2SJohan Hedberg return; 6683b1c325c2SJohan Hedberg 6684f15b8ecfSJohan Hedberg return_credits = le_max_credits - chan->rx_credits; 6685b1c325c2SJohan Hedberg 6686b1c325c2SJohan Hedberg BT_DBG("chan %p returning %u credits to sender", chan, return_credits); 6687b1c325c2SJohan Hedberg 6688b1c325c2SJohan Hedberg chan->rx_credits += return_credits; 6689b1c325c2SJohan Hedberg 6690b1c325c2SJohan Hedberg pkt.cid = cpu_to_le16(chan->scid); 6691b1c325c2SJohan Hedberg pkt.credits = cpu_to_le16(return_credits); 6692b1c325c2SJohan Hedberg 6693b1c325c2SJohan Hedberg chan->ident = l2cap_get_ident(conn); 6694b1c325c2SJohan Hedberg 6695b1c325c2SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); 6696b1c325c2SJohan Hedberg } 6697b1c325c2SJohan Hedberg 6698fad5fc89SJohan Hedberg static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6699fad5fc89SJohan Hedberg { 6700aac23bf6SJohan Hedberg int err; 6701fad5fc89SJohan Hedberg 6702aac23bf6SJohan Hedberg if (!chan->rx_credits) { 6703aac23bf6SJohan Hedberg BT_ERR("No credits to receive LE L2CAP data"); 6704dfd9774cSJohan Hedberg l2cap_send_disconn_req(chan, ECONNRESET); 6705fad5fc89SJohan Hedberg return -ENOBUFS; 6706aac23bf6SJohan Hedberg } 6707aac23bf6SJohan Hedberg 6708aac23bf6SJohan Hedberg if (chan->imtu < skb->len) { 6709aac23bf6SJohan Hedberg BT_ERR("Too big LE L2CAP PDU"); 6710aac23bf6SJohan Hedberg return -ENOBUFS; 6711aac23bf6SJohan Hedberg } 6712fad5fc89SJohan Hedberg 6713fad5fc89SJohan Hedberg chan->rx_credits--; 6714fad5fc89SJohan Hedberg BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); 6715fad5fc89SJohan Hedberg 6716fad5fc89SJohan Hedberg l2cap_chan_le_send_credits(chan); 6717fad5fc89SJohan Hedberg 6718aac23bf6SJohan Hedberg err = 0; 6719aac23bf6SJohan Hedberg 6720aac23bf6SJohan Hedberg if (!chan->sdu) { 6721aac23bf6SJohan Hedberg u16 sdu_len; 6722aac23bf6SJohan Hedberg 6723aac23bf6SJohan Hedberg sdu_len = get_unaligned_le16(skb->data); 6724aac23bf6SJohan Hedberg skb_pull(skb, L2CAP_SDULEN_SIZE); 6725aac23bf6SJohan Hedberg 6726aac23bf6SJohan Hedberg BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", 6727aac23bf6SJohan Hedberg sdu_len, skb->len, chan->imtu); 6728aac23bf6SJohan Hedberg 6729aac23bf6SJohan Hedberg if (sdu_len > chan->imtu) { 6730aac23bf6SJohan Hedberg BT_ERR("Too big LE L2CAP SDU length received"); 6731aac23bf6SJohan Hedberg err = -EMSGSIZE; 6732aac23bf6SJohan Hedberg goto failed; 6733aac23bf6SJohan Hedberg } 6734aac23bf6SJohan Hedberg 6735aac23bf6SJohan Hedberg if (skb->len > sdu_len) { 6736aac23bf6SJohan Hedberg BT_ERR("Too much LE L2CAP data received"); 6737aac23bf6SJohan Hedberg err = -EINVAL; 6738aac23bf6SJohan Hedberg goto failed; 6739aac23bf6SJohan Hedberg } 6740aac23bf6SJohan Hedberg 6741aac23bf6SJohan Hedberg if (skb->len == sdu_len) 6742fad5fc89SJohan Hedberg return chan->ops->recv(chan, skb); 6743aac23bf6SJohan Hedberg 6744aac23bf6SJohan Hedberg chan->sdu = skb; 6745aac23bf6SJohan Hedberg chan->sdu_len = sdu_len; 6746aac23bf6SJohan Hedberg chan->sdu_last_frag = skb; 6747aac23bf6SJohan Hedberg 6748aac23bf6SJohan Hedberg return 0; 6749aac23bf6SJohan Hedberg } 6750aac23bf6SJohan Hedberg 6751aac23bf6SJohan Hedberg BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", 6752aac23bf6SJohan Hedberg chan->sdu->len, skb->len, chan->sdu_len); 6753aac23bf6SJohan Hedberg 6754aac23bf6SJohan Hedberg if (chan->sdu->len + skb->len > chan->sdu_len) { 6755aac23bf6SJohan Hedberg BT_ERR("Too much LE L2CAP data received"); 6756aac23bf6SJohan Hedberg err = -EINVAL; 6757aac23bf6SJohan Hedberg goto failed; 6758aac23bf6SJohan Hedberg } 6759aac23bf6SJohan Hedberg 6760aac23bf6SJohan Hedberg append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); 6761aac23bf6SJohan Hedberg skb = NULL; 6762aac23bf6SJohan Hedberg 6763aac23bf6SJohan Hedberg if (chan->sdu->len == chan->sdu_len) { 6764aac23bf6SJohan Hedberg err = chan->ops->recv(chan, chan->sdu); 6765aac23bf6SJohan Hedberg if (!err) { 6766aac23bf6SJohan Hedberg chan->sdu = NULL; 6767aac23bf6SJohan Hedberg chan->sdu_last_frag = NULL; 6768aac23bf6SJohan Hedberg chan->sdu_len = 0; 6769aac23bf6SJohan Hedberg } 6770aac23bf6SJohan Hedberg } 6771aac23bf6SJohan Hedberg 6772aac23bf6SJohan Hedberg failed: 6773aac23bf6SJohan Hedberg if (err) { 6774aac23bf6SJohan Hedberg kfree_skb(skb); 6775aac23bf6SJohan Hedberg kfree_skb(chan->sdu); 6776aac23bf6SJohan Hedberg chan->sdu = NULL; 6777aac23bf6SJohan Hedberg chan->sdu_last_frag = NULL; 6778aac23bf6SJohan Hedberg chan->sdu_len = 0; 6779aac23bf6SJohan Hedberg } 6780aac23bf6SJohan Hedberg 6781aac23bf6SJohan Hedberg /* We can't return an error here since we took care of the skb 6782aac23bf6SJohan Hedberg * freeing internally. An error return would cause the caller to 6783aac23bf6SJohan Hedberg * do a double-free of the skb. 6784aac23bf6SJohan Hedberg */ 6785aac23bf6SJohan Hedberg return 0; 6786fad5fc89SJohan Hedberg } 6787fad5fc89SJohan Hedberg 678813ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 678913ca56e0SAndrei Emeltchenko struct sk_buff *skb) 67900a708f8fSGustavo F. Padovan { 679148454079SGustavo F. Padovan struct l2cap_chan *chan; 67920a708f8fSGustavo F. Padovan 6793baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 679448454079SGustavo F. Padovan if (!chan) { 679597e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 679697e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 679797e8e89dSAndrei Emeltchenko if (!chan) { 679897e8e89dSAndrei Emeltchenko kfree_skb(skb); 679913ca56e0SAndrei Emeltchenko return; 680097e8e89dSAndrei Emeltchenko } 680197e8e89dSAndrei Emeltchenko 680297e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 680397e8e89dSAndrei Emeltchenko } else { 68040a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 68056be36555SAndrei Emeltchenko /* Drop packet and return */ 68063379013bSDan Carpenter kfree_skb(skb); 680713ca56e0SAndrei Emeltchenko return; 68080a708f8fSGustavo F. Padovan } 680997e8e89dSAndrei Emeltchenko } 68100a708f8fSGustavo F. Padovan 681149208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 68120a708f8fSGustavo F. Padovan 6813315917e0SJohan Hedberg /* If we receive data on a fixed channel before the info req/rsp 6814315917e0SJohan Hedberg * procdure is done simply assume that the channel is supported 6815315917e0SJohan Hedberg * and mark it as ready. 6816315917e0SJohan Hedberg */ 6817315917e0SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_FIXED) 6818315917e0SJohan Hedberg l2cap_chan_ready(chan); 6819315917e0SJohan Hedberg 682089bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 68210a708f8fSGustavo F. Padovan goto drop; 68220a708f8fSGustavo F. Padovan 68230c1bc5c6SGustavo F. Padovan switch (chan->mode) { 682438319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 6825fad5fc89SJohan Hedberg if (l2cap_le_data_rcv(chan, skb) < 0) 6826fad5fc89SJohan Hedberg goto drop; 6827fad5fc89SJohan Hedberg 6828fad5fc89SJohan Hedberg goto done; 6829fad5fc89SJohan Hedberg 68300a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 68310a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 68320a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 68330a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 68340a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 68350a708f8fSGustavo F. Padovan 68362c96e03dSSzymon Janc if (chan->imtu < skb->len) { 68372c96e03dSSzymon Janc BT_ERR("Dropping L2CAP data: receive buffer overflow"); 68380a708f8fSGustavo F. Padovan goto drop; 68392c96e03dSSzymon Janc } 68400a708f8fSGustavo F. Padovan 684180b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 68420a708f8fSGustavo F. Padovan goto done; 68430a708f8fSGustavo F. Padovan break; 68440a708f8fSGustavo F. Padovan 68450a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 68460a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6847cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 68480a708f8fSGustavo F. Padovan goto done; 68490a708f8fSGustavo F. Padovan 68500a708f8fSGustavo F. Padovan default: 68510c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 68520a708f8fSGustavo F. Padovan break; 68530a708f8fSGustavo F. Padovan } 68540a708f8fSGustavo F. Padovan 68550a708f8fSGustavo F. Padovan drop: 68560a708f8fSGustavo F. Padovan kfree_skb(skb); 68570a708f8fSGustavo F. Padovan 68580a708f8fSGustavo F. Padovan done: 68596be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 68600a708f8fSGustavo F. Padovan } 68610a708f8fSGustavo F. Padovan 686284104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 686384104b24SAndrei Emeltchenko struct sk_buff *skb) 68640a708f8fSGustavo F. Padovan { 6865ae4fd2d3SMarcel Holtmann struct hci_conn *hcon = conn->hcon; 686623691d75SGustavo F. Padovan struct l2cap_chan *chan; 68670a708f8fSGustavo F. Padovan 6868ae4fd2d3SMarcel Holtmann if (hcon->type != ACL_LINK) 6869a24cce14SJohan Hedberg goto free_skb; 6870ae4fd2d3SMarcel Holtmann 6871bf20fd4eSJohan Hedberg chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, 6872bf20fd4eSJohan Hedberg ACL_LINK); 687323691d75SGustavo F. Padovan if (!chan) 6874a24cce14SJohan Hedberg goto free_skb; 68750a708f8fSGustavo F. Padovan 68765b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 68770a708f8fSGustavo F. Padovan 687889bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 68790a708f8fSGustavo F. Padovan goto drop; 68800a708f8fSGustavo F. Padovan 6881e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 68820a708f8fSGustavo F. Padovan goto drop; 68830a708f8fSGustavo F. Padovan 68842edf870dSMarcel Holtmann /* Store remote BD_ADDR and PSM for msg_name */ 6885a4368ff3SJohan Hedberg bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst); 6886a4368ff3SJohan Hedberg bt_cb(skb)->l2cap.psm = psm; 68872edf870dSMarcel Holtmann 6888a24cce14SJohan Hedberg if (!chan->ops->recv(chan, skb)) { 6889a24cce14SJohan Hedberg l2cap_chan_put(chan); 689084104b24SAndrei Emeltchenko return; 6891a24cce14SJohan Hedberg } 68920a708f8fSGustavo F. Padovan 68930a708f8fSGustavo F. Padovan drop: 6894a24cce14SJohan Hedberg l2cap_chan_put(chan); 6895a24cce14SJohan Hedberg free_skb: 68960a708f8fSGustavo F. Padovan kfree_skb(skb); 68970a708f8fSGustavo F. Padovan } 68980a708f8fSGustavo F. Padovan 68990a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 69000a708f8fSGustavo F. Padovan { 69010a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 690261a939c6SJohan Hedberg struct hci_conn *hcon = conn->hcon; 69030a708f8fSGustavo F. Padovan u16 cid, len; 69040a708f8fSGustavo F. Padovan __le16 psm; 69050a708f8fSGustavo F. Padovan 690661a939c6SJohan Hedberg if (hcon->state != BT_CONNECTED) { 690761a939c6SJohan Hedberg BT_DBG("queueing pending rx skb"); 690861a939c6SJohan Hedberg skb_queue_tail(&conn->pending_rx, skb); 690961a939c6SJohan Hedberg return; 691061a939c6SJohan Hedberg } 691161a939c6SJohan Hedberg 69120a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 69130a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 69140a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 69150a708f8fSGustavo F. Padovan 69160a708f8fSGustavo F. Padovan if (len != skb->len) { 69170a708f8fSGustavo F. Padovan kfree_skb(skb); 69180a708f8fSGustavo F. Padovan return; 69190a708f8fSGustavo F. Padovan } 69200a708f8fSGustavo F. Padovan 69219e1d7e15SJohan Hedberg /* Since we can't actively block incoming LE connections we must 69229e1d7e15SJohan Hedberg * at least ensure that we ignore incoming data from them. 69239e1d7e15SJohan Hedberg */ 69249e1d7e15SJohan Hedberg if (hcon->type == LE_LINK && 6925dcc36c16SJohan Hedberg hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst, 6926a250e048SJohan Hedberg bdaddr_dst_type(hcon))) { 6927e493150eSJohan Hedberg kfree_skb(skb); 6928e493150eSJohan Hedberg return; 6929e493150eSJohan Hedberg } 6930e493150eSJohan Hedberg 69310a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 69320a708f8fSGustavo F. Padovan 69330a708f8fSGustavo F. Padovan switch (cid) { 69340a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 69350a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 69360a708f8fSGustavo F. Padovan break; 69370a708f8fSGustavo F. Padovan 69380a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 6939097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 69400181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 69410a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 69420a708f8fSGustavo F. Padovan break; 69430a708f8fSGustavo F. Padovan 6944a2877629SMarcel Holtmann case L2CAP_CID_LE_SIGNALING: 6945a2877629SMarcel Holtmann l2cap_le_sig_channel(conn, skb); 6946a2877629SMarcel Holtmann break; 6947a2877629SMarcel Holtmann 69480a708f8fSGustavo F. Padovan default: 69490a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 69500a708f8fSGustavo F. Padovan break; 69510a708f8fSGustavo F. Padovan } 69520a708f8fSGustavo F. Padovan } 69530a708f8fSGustavo F. Padovan 695461a939c6SJohan Hedberg static void process_pending_rx(struct work_struct *work) 695561a939c6SJohan Hedberg { 695661a939c6SJohan Hedberg struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 695761a939c6SJohan Hedberg pending_rx_work); 695861a939c6SJohan Hedberg struct sk_buff *skb; 695961a939c6SJohan Hedberg 696061a939c6SJohan Hedberg BT_DBG(""); 696161a939c6SJohan Hedberg 696261a939c6SJohan Hedberg while ((skb = skb_dequeue(&conn->pending_rx))) 696361a939c6SJohan Hedberg l2cap_recv_frame(conn, skb); 696461a939c6SJohan Hedberg } 696561a939c6SJohan Hedberg 6966162b49e7SJohan Hedberg static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) 6967162b49e7SJohan Hedberg { 6968162b49e7SJohan Hedberg struct l2cap_conn *conn = hcon->l2cap_data; 6969162b49e7SJohan Hedberg struct hci_chan *hchan; 6970162b49e7SJohan Hedberg 6971162b49e7SJohan Hedberg if (conn) 6972162b49e7SJohan Hedberg return conn; 6973162b49e7SJohan Hedberg 6974162b49e7SJohan Hedberg hchan = hci_chan_create(hcon); 6975162b49e7SJohan Hedberg if (!hchan) 6976162b49e7SJohan Hedberg return NULL; 6977162b49e7SJohan Hedberg 697827f70f3eSJohan Hedberg conn = kzalloc(sizeof(*conn), GFP_KERNEL); 6979162b49e7SJohan Hedberg if (!conn) { 6980162b49e7SJohan Hedberg hci_chan_del(hchan); 6981162b49e7SJohan Hedberg return NULL; 6982162b49e7SJohan Hedberg } 6983162b49e7SJohan Hedberg 6984162b49e7SJohan Hedberg kref_init(&conn->ref); 6985162b49e7SJohan Hedberg hcon->l2cap_data = conn; 698651bb8457SJohan Hedberg conn->hcon = hci_conn_get(hcon); 6987162b49e7SJohan Hedberg conn->hchan = hchan; 6988162b49e7SJohan Hedberg 6989162b49e7SJohan Hedberg BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 6990162b49e7SJohan Hedberg 6991162b49e7SJohan Hedberg switch (hcon->type) { 6992162b49e7SJohan Hedberg case LE_LINK: 6993162b49e7SJohan Hedberg if (hcon->hdev->le_mtu) { 6994162b49e7SJohan Hedberg conn->mtu = hcon->hdev->le_mtu; 6995162b49e7SJohan Hedberg break; 6996162b49e7SJohan Hedberg } 6997162b49e7SJohan Hedberg /* fall through */ 6998162b49e7SJohan Hedberg default: 6999162b49e7SJohan Hedberg conn->mtu = hcon->hdev->acl_mtu; 7000162b49e7SJohan Hedberg break; 7001162b49e7SJohan Hedberg } 7002162b49e7SJohan Hedberg 7003162b49e7SJohan Hedberg conn->feat_mask = 0; 7004162b49e7SJohan Hedberg 70050bd49fc7SJohan Hedberg conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS; 70060bd49fc7SJohan Hedberg 70070bd49fc7SJohan Hedberg if (hcon->type == ACL_LINK && 7008d7a5a11dSMarcel Holtmann hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED)) 70090bd49fc7SJohan Hedberg conn->local_fixed_chan |= L2CAP_FC_A2MP; 7010162b49e7SJohan Hedberg 7011d7a5a11dSMarcel Holtmann if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) && 7012f9be9e86SMarcel Holtmann (bredr_sc_enabled(hcon->hdev) || 7013b7cb93e5SMarcel Holtmann hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP))) 7014b5ae344dSJohan Hedberg conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR; 7015b5ae344dSJohan Hedberg 70165a54e7c8SMarcel Holtmann mutex_init(&conn->ident_lock); 7017162b49e7SJohan Hedberg mutex_init(&conn->chan_lock); 7018162b49e7SJohan Hedberg 7019162b49e7SJohan Hedberg INIT_LIST_HEAD(&conn->chan_l); 7020162b49e7SJohan Hedberg INIT_LIST_HEAD(&conn->users); 7021162b49e7SJohan Hedberg 7022162b49e7SJohan Hedberg INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 7023162b49e7SJohan Hedberg 702461a939c6SJohan Hedberg skb_queue_head_init(&conn->pending_rx); 702561a939c6SJohan Hedberg INIT_WORK(&conn->pending_rx_work, process_pending_rx); 7026f3d82d0cSJohan Hedberg INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr); 702761a939c6SJohan Hedberg 7028162b49e7SJohan Hedberg conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 7029162b49e7SJohan Hedberg 7030162b49e7SJohan Hedberg return conn; 7031162b49e7SJohan Hedberg } 7032162b49e7SJohan Hedberg 7033162b49e7SJohan Hedberg static bool is_valid_psm(u16 psm, u8 dst_type) { 7034162b49e7SJohan Hedberg if (!psm) 7035162b49e7SJohan Hedberg return false; 7036162b49e7SJohan Hedberg 7037162b49e7SJohan Hedberg if (bdaddr_type_is_le(dst_type)) 7038162b49e7SJohan Hedberg return (psm <= 0x00ff); 7039162b49e7SJohan Hedberg 7040162b49e7SJohan Hedberg /* PSM must be odd and lsb of upper byte must be 0 */ 7041162b49e7SJohan Hedberg return ((psm & 0x0101) == 0x0001); 7042162b49e7SJohan Hedberg } 7043162b49e7SJohan Hedberg 7044162b49e7SJohan Hedberg int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 7045162b49e7SJohan Hedberg bdaddr_t *dst, u8 dst_type) 7046162b49e7SJohan Hedberg { 7047162b49e7SJohan Hedberg struct l2cap_conn *conn; 7048162b49e7SJohan Hedberg struct hci_conn *hcon; 7049162b49e7SJohan Hedberg struct hci_dev *hdev; 7050162b49e7SJohan Hedberg int err; 7051162b49e7SJohan Hedberg 7052162b49e7SJohan Hedberg BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, 7053162b49e7SJohan Hedberg dst_type, __le16_to_cpu(psm)); 7054162b49e7SJohan Hedberg 7055162b49e7SJohan Hedberg hdev = hci_get_route(dst, &chan->src); 7056162b49e7SJohan Hedberg if (!hdev) 7057162b49e7SJohan Hedberg return -EHOSTUNREACH; 7058162b49e7SJohan Hedberg 7059162b49e7SJohan Hedberg hci_dev_lock(hdev); 7060162b49e7SJohan Hedberg 7061162b49e7SJohan Hedberg if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && 7062162b49e7SJohan Hedberg chan->chan_type != L2CAP_CHAN_RAW) { 7063162b49e7SJohan Hedberg err = -EINVAL; 7064162b49e7SJohan Hedberg goto done; 7065162b49e7SJohan Hedberg } 7066162b49e7SJohan Hedberg 706721626e62SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { 706821626e62SJohan Hedberg err = -EINVAL; 706921626e62SJohan Hedberg goto done; 707021626e62SJohan Hedberg } 707121626e62SJohan Hedberg 707221626e62SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { 7073162b49e7SJohan Hedberg err = -EINVAL; 7074162b49e7SJohan Hedberg goto done; 7075162b49e7SJohan Hedberg } 7076162b49e7SJohan Hedberg 7077162b49e7SJohan Hedberg switch (chan->mode) { 7078162b49e7SJohan Hedberg case L2CAP_MODE_BASIC: 7079162b49e7SJohan Hedberg break; 7080162b49e7SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 7081162b49e7SJohan Hedberg l2cap_le_flowctl_init(chan); 7082162b49e7SJohan Hedberg break; 7083162b49e7SJohan Hedberg case L2CAP_MODE_ERTM: 7084162b49e7SJohan Hedberg case L2CAP_MODE_STREAMING: 7085162b49e7SJohan Hedberg if (!disable_ertm) 7086162b49e7SJohan Hedberg break; 7087162b49e7SJohan Hedberg /* fall through */ 7088162b49e7SJohan Hedberg default: 7089beb19e4cSJohan Hedberg err = -EOPNOTSUPP; 7090162b49e7SJohan Hedberg goto done; 7091162b49e7SJohan Hedberg } 7092162b49e7SJohan Hedberg 7093162b49e7SJohan Hedberg switch (chan->state) { 7094162b49e7SJohan Hedberg case BT_CONNECT: 7095162b49e7SJohan Hedberg case BT_CONNECT2: 7096162b49e7SJohan Hedberg case BT_CONFIG: 7097162b49e7SJohan Hedberg /* Already connecting */ 7098162b49e7SJohan Hedberg err = 0; 7099162b49e7SJohan Hedberg goto done; 7100162b49e7SJohan Hedberg 7101162b49e7SJohan Hedberg case BT_CONNECTED: 7102162b49e7SJohan Hedberg /* Already connected */ 7103162b49e7SJohan Hedberg err = -EISCONN; 7104162b49e7SJohan Hedberg goto done; 7105162b49e7SJohan Hedberg 7106162b49e7SJohan Hedberg case BT_OPEN: 7107162b49e7SJohan Hedberg case BT_BOUND: 7108162b49e7SJohan Hedberg /* Can connect */ 7109162b49e7SJohan Hedberg break; 7110162b49e7SJohan Hedberg 7111162b49e7SJohan Hedberg default: 7112162b49e7SJohan Hedberg err = -EBADFD; 7113162b49e7SJohan Hedberg goto done; 7114162b49e7SJohan Hedberg } 7115162b49e7SJohan Hedberg 7116162b49e7SJohan Hedberg /* Set destination address and psm */ 7117162b49e7SJohan Hedberg bacpy(&chan->dst, dst); 7118162b49e7SJohan Hedberg chan->dst_type = dst_type; 7119162b49e7SJohan Hedberg 7120162b49e7SJohan Hedberg chan->psm = psm; 7121162b49e7SJohan Hedberg chan->dcid = cid; 7122162b49e7SJohan Hedberg 71236f77d8c7SAndre Guedes if (bdaddr_type_is_le(dst_type)) { 71246f77d8c7SAndre Guedes /* Convert from L2CAP channel address type to HCI address type 71256f77d8c7SAndre Guedes */ 71266f77d8c7SAndre Guedes if (dst_type == BDADDR_LE_PUBLIC) 71276f77d8c7SAndre Guedes dst_type = ADDR_LE_DEV_PUBLIC; 71286f77d8c7SAndre Guedes else 71296f77d8c7SAndre Guedes dst_type = ADDR_LE_DEV_RANDOM; 71306f77d8c7SAndre Guedes 7131d7a5a11dSMarcel Holtmann if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) 71320ad06aa6SJohan Hedberg hcon = hci_connect_le(hdev, dst, dst_type, 7133fa142220SJakub Pawlowski chan->sec_level, 7134fa142220SJakub Pawlowski HCI_LE_CONN_TIMEOUT, 71350ad06aa6SJohan Hedberg HCI_ROLE_SLAVE); 71360ad06aa6SJohan Hedberg else 71370ad06aa6SJohan Hedberg hcon = hci_connect_le_scan(hdev, dst, dst_type, 71380ad06aa6SJohan Hedberg chan->sec_level, 71390ad06aa6SJohan Hedberg HCI_LE_CONN_TIMEOUT); 71400ad06aa6SJohan Hedberg 71416f77d8c7SAndre Guedes } else { 7142d93375a8SJohan Hedberg u8 auth_type = l2cap_get_auth_type(chan); 714304a6c589SAndre Guedes hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); 71446f77d8c7SAndre Guedes } 7145162b49e7SJohan Hedberg 7146162b49e7SJohan Hedberg if (IS_ERR(hcon)) { 7147162b49e7SJohan Hedberg err = PTR_ERR(hcon); 7148162b49e7SJohan Hedberg goto done; 7149162b49e7SJohan Hedberg } 7150162b49e7SJohan Hedberg 7151162b49e7SJohan Hedberg conn = l2cap_conn_add(hcon); 7152162b49e7SJohan Hedberg if (!conn) { 7153162b49e7SJohan Hedberg hci_conn_drop(hcon); 7154162b49e7SJohan Hedberg err = -ENOMEM; 7155162b49e7SJohan Hedberg goto done; 7156162b49e7SJohan Hedberg } 7157162b49e7SJohan Hedberg 715802e246aeSJohan Hedberg mutex_lock(&conn->chan_lock); 715902e246aeSJohan Hedberg l2cap_chan_lock(chan); 716002e246aeSJohan Hedberg 7161162b49e7SJohan Hedberg if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { 7162162b49e7SJohan Hedberg hci_conn_drop(hcon); 7163162b49e7SJohan Hedberg err = -EBUSY; 716402e246aeSJohan Hedberg goto chan_unlock; 7165162b49e7SJohan Hedberg } 7166162b49e7SJohan Hedberg 7167162b49e7SJohan Hedberg /* Update source addr of the socket */ 7168162b49e7SJohan Hedberg bacpy(&chan->src, &hcon->src); 7169a250e048SJohan Hedberg chan->src_type = bdaddr_src_type(hcon); 7170162b49e7SJohan Hedberg 717102e246aeSJohan Hedberg __l2cap_chan_add(conn, chan); 7172162b49e7SJohan Hedberg 7173162b49e7SJohan Hedberg /* l2cap_chan_add takes its own ref so we can drop this one */ 7174162b49e7SJohan Hedberg hci_conn_drop(hcon); 7175162b49e7SJohan Hedberg 7176162b49e7SJohan Hedberg l2cap_state_change(chan, BT_CONNECT); 7177162b49e7SJohan Hedberg __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 7178162b49e7SJohan Hedberg 717961202e4dSJohan Hedberg /* Release chan->sport so that it can be reused by other 718061202e4dSJohan Hedberg * sockets (as it's only used for listening sockets). 718161202e4dSJohan Hedberg */ 718261202e4dSJohan Hedberg write_lock(&chan_list_lock); 718361202e4dSJohan Hedberg chan->sport = 0; 718461202e4dSJohan Hedberg write_unlock(&chan_list_lock); 718561202e4dSJohan Hedberg 7186162b49e7SJohan Hedberg if (hcon->state == BT_CONNECTED) { 7187162b49e7SJohan Hedberg if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 7188162b49e7SJohan Hedberg __clear_chan_timer(chan); 7189e7cafc45SJohan Hedberg if (l2cap_chan_check_security(chan, true)) 7190162b49e7SJohan Hedberg l2cap_state_change(chan, BT_CONNECTED); 7191162b49e7SJohan Hedberg } else 7192162b49e7SJohan Hedberg l2cap_do_start(chan); 7193162b49e7SJohan Hedberg } 7194162b49e7SJohan Hedberg 7195162b49e7SJohan Hedberg err = 0; 7196162b49e7SJohan Hedberg 719702e246aeSJohan Hedberg chan_unlock: 7198162b49e7SJohan Hedberg l2cap_chan_unlock(chan); 719902e246aeSJohan Hedberg mutex_unlock(&conn->chan_lock); 720002e246aeSJohan Hedberg done: 7201162b49e7SJohan Hedberg hci_dev_unlock(hdev); 7202162b49e7SJohan Hedberg hci_dev_put(hdev); 7203162b49e7SJohan Hedberg return err; 7204162b49e7SJohan Hedberg } 72056b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_connect); 7206162b49e7SJohan Hedberg 72070a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 72080a708f8fSGustavo F. Padovan 7209686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 72100a708f8fSGustavo F. Padovan { 72110a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 721223691d75SGustavo F. Padovan struct l2cap_chan *c; 72130a708f8fSGustavo F. Padovan 72146ed93dc6SAndrei Emeltchenko BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 72150a708f8fSGustavo F. Padovan 72160a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 721723691d75SGustavo F. Padovan read_lock(&chan_list_lock); 721823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 721989bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 72200a708f8fSGustavo F. Padovan continue; 72210a708f8fSGustavo F. Padovan 72227eafc59eSMarcel Holtmann if (!bacmp(&c->src, &hdev->bdaddr)) { 72230a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 722443bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 72250a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 72260a708f8fSGustavo F. Padovan exact++; 72277eafc59eSMarcel Holtmann } else if (!bacmp(&c->src, BDADDR_ANY)) { 72280a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 722943bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 72300a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 72310a708f8fSGustavo F. Padovan } 72320a708f8fSGustavo F. Padovan } 723323691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 72340a708f8fSGustavo F. Padovan 72350a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 72360a708f8fSGustavo F. Padovan } 72370a708f8fSGustavo F. Padovan 7238e760ec12SJohan Hedberg /* Find the next fixed channel in BT_LISTEN state, continue iteration 7239e760ec12SJohan Hedberg * from an existing channel in the list or from the beginning of the 7240e760ec12SJohan Hedberg * global list (by passing NULL as first parameter). 7241e760ec12SJohan Hedberg */ 7242e760ec12SJohan Hedberg static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c, 7243327a7191SJohan Hedberg struct hci_conn *hcon) 7244e760ec12SJohan Hedberg { 7245327a7191SJohan Hedberg u8 src_type = bdaddr_src_type(hcon); 7246327a7191SJohan Hedberg 7247e760ec12SJohan Hedberg read_lock(&chan_list_lock); 7248e760ec12SJohan Hedberg 7249e760ec12SJohan Hedberg if (c) 7250e760ec12SJohan Hedberg c = list_next_entry(c, global_l); 7251e760ec12SJohan Hedberg else 7252e760ec12SJohan Hedberg c = list_entry(chan_list.next, typeof(*c), global_l); 7253e760ec12SJohan Hedberg 7254e760ec12SJohan Hedberg list_for_each_entry_from(c, &chan_list, global_l) { 7255e760ec12SJohan Hedberg if (c->chan_type != L2CAP_CHAN_FIXED) 7256e760ec12SJohan Hedberg continue; 7257e760ec12SJohan Hedberg if (c->state != BT_LISTEN) 7258e760ec12SJohan Hedberg continue; 7259327a7191SJohan Hedberg if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY)) 7260e760ec12SJohan Hedberg continue; 7261327a7191SJohan Hedberg if (src_type != c->src_type) 726254a1b626SJohan Hedberg continue; 7263e760ec12SJohan Hedberg 7264e760ec12SJohan Hedberg l2cap_chan_hold(c); 7265e760ec12SJohan Hedberg read_unlock(&chan_list_lock); 7266e760ec12SJohan Hedberg return c; 7267e760ec12SJohan Hedberg } 7268e760ec12SJohan Hedberg 7269e760ec12SJohan Hedberg read_unlock(&chan_list_lock); 7270e760ec12SJohan Hedberg 7271e760ec12SJohan Hedberg return NULL; 7272e760ec12SJohan Hedberg } 7273e760ec12SJohan Hedberg 7274539c496dSJohan Hedberg static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 72750a708f8fSGustavo F. Padovan { 7276e760ec12SJohan Hedberg struct hci_dev *hdev = hcon->hdev; 72770a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 7278e760ec12SJohan Hedberg struct l2cap_chan *pchan; 7279e760ec12SJohan Hedberg u8 dst_type; 72800a708f8fSGustavo F. Padovan 7281539c496dSJohan Hedberg if (hcon->type != ACL_LINK && hcon->type != LE_LINK) 7282539c496dSJohan Hedberg return; 7283539c496dSJohan Hedberg 72846ed93dc6SAndrei Emeltchenko BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 72850a708f8fSGustavo F. Padovan 7286dc0f5088SJohan Hedberg if (status) { 7287e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 7288dc0f5088SJohan Hedberg return; 7289ba6fc317SAndrei Emeltchenko } 7290dc0f5088SJohan Hedberg 7291dc0f5088SJohan Hedberg conn = l2cap_conn_add(hcon); 7292dc0f5088SJohan Hedberg if (!conn) 7293dc0f5088SJohan Hedberg return; 7294dc0f5088SJohan Hedberg 7295a250e048SJohan Hedberg dst_type = bdaddr_dst_type(hcon); 7296e760ec12SJohan Hedberg 7297e760ec12SJohan Hedberg /* If device is blocked, do not create channels for it */ 7298e760ec12SJohan Hedberg if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type)) 7299e760ec12SJohan Hedberg return; 7300e760ec12SJohan Hedberg 7301e760ec12SJohan Hedberg /* Find fixed channels and notify them of the new connection. We 7302e760ec12SJohan Hedberg * use multiple individual lookups, continuing each time where 7303e760ec12SJohan Hedberg * we left off, because the list lock would prevent calling the 7304e760ec12SJohan Hedberg * potentially sleeping l2cap_chan_lock() function. 7305e760ec12SJohan Hedberg */ 7306327a7191SJohan Hedberg pchan = l2cap_global_fixed_chan(NULL, hcon); 7307e760ec12SJohan Hedberg while (pchan) { 7308e760ec12SJohan Hedberg struct l2cap_chan *chan, *next; 7309e760ec12SJohan Hedberg 7310e760ec12SJohan Hedberg /* Client fixed channels should override server ones */ 7311e760ec12SJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, pchan->scid)) 7312e760ec12SJohan Hedberg goto next; 7313e760ec12SJohan Hedberg 7314e760ec12SJohan Hedberg l2cap_chan_lock(pchan); 7315e760ec12SJohan Hedberg chan = pchan->ops->new_connection(pchan); 7316e760ec12SJohan Hedberg if (chan) { 7317e760ec12SJohan Hedberg bacpy(&chan->src, &hcon->src); 7318e760ec12SJohan Hedberg bacpy(&chan->dst, &hcon->dst); 7319a250e048SJohan Hedberg chan->src_type = bdaddr_src_type(hcon); 7320e760ec12SJohan Hedberg chan->dst_type = dst_type; 7321e760ec12SJohan Hedberg 7322e760ec12SJohan Hedberg __l2cap_chan_add(conn, chan); 7323e760ec12SJohan Hedberg } 7324e760ec12SJohan Hedberg 7325e760ec12SJohan Hedberg l2cap_chan_unlock(pchan); 7326e760ec12SJohan Hedberg next: 7327327a7191SJohan Hedberg next = l2cap_global_fixed_chan(pchan, hcon); 7328e760ec12SJohan Hedberg l2cap_chan_put(pchan); 7329e760ec12SJohan Hedberg pchan = next; 7330e760ec12SJohan Hedberg } 7331e760ec12SJohan Hedberg 7332dc0f5088SJohan Hedberg l2cap_conn_ready(conn); 73330a708f8fSGustavo F. Padovan } 73340a708f8fSGustavo F. Padovan 7335686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 73360a708f8fSGustavo F. Padovan { 73370a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 73380a708f8fSGustavo F. Padovan 73390a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 73400a708f8fSGustavo F. Padovan 7341686ebf28SUlisses Furquim if (!conn) 73429f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 73430a708f8fSGustavo F. Padovan return conn->disc_reason; 73440a708f8fSGustavo F. Padovan } 73450a708f8fSGustavo F. Padovan 73463a6d576bSJohan Hedberg static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 73470a708f8fSGustavo F. Padovan { 73483a6d576bSJohan Hedberg if (hcon->type != ACL_LINK && hcon->type != LE_LINK) 73493a6d576bSJohan Hedberg return; 73503a6d576bSJohan Hedberg 73510a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 73520a708f8fSGustavo F. Padovan 7353e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 73540a708f8fSGustavo F. Padovan } 73550a708f8fSGustavo F. Padovan 73564343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 73570a708f8fSGustavo F. Padovan { 7358715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 73590a708f8fSGustavo F. Padovan return; 73600a708f8fSGustavo F. Padovan 73610a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 73624343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 7363ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 73647d513e92SMarcel Holtmann } else if (chan->sec_level == BT_SECURITY_HIGH || 73657d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 73660f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 73670a708f8fSGustavo F. Padovan } else { 73684343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 7369c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 73700a708f8fSGustavo F. Padovan } 73710a708f8fSGustavo F. Padovan } 73720a708f8fSGustavo F. Padovan 7373354fe804SJohan Hedberg static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 73740a708f8fSGustavo F. Padovan { 73750a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 737648454079SGustavo F. Padovan struct l2cap_chan *chan; 73770a708f8fSGustavo F. Padovan 73780a708f8fSGustavo F. Padovan if (!conn) 7379354fe804SJohan Hedberg return; 73800a708f8fSGustavo F. Padovan 738189d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 73820a708f8fSGustavo F. Padovan 73833df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 73840a708f8fSGustavo F. Padovan 73853df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 73866be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 73870a708f8fSGustavo F. Padovan 738889d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 738989d8b407SAndrei Emeltchenko state_to_string(chan->state)); 7390f1cb9af5SVinicius Costa Gomes 73912338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 739278eb2f98SAndrei Emeltchenko l2cap_chan_unlock(chan); 739378eb2f98SAndrei Emeltchenko continue; 739478eb2f98SAndrei Emeltchenko } 739578eb2f98SAndrei Emeltchenko 7396191eb398SJohan Hedberg if (!status && encrypt) 7397f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 7398f1cb9af5SVinicius Costa Gomes 739996eff46eSAndrei Emeltchenko if (!__l2cap_no_conn_pending(chan)) { 74006be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 74010a708f8fSGustavo F. Padovan continue; 74020a708f8fSGustavo F. Padovan } 74030a708f8fSGustavo F. Padovan 740489bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 740589bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 7406d97c899bSMarcel Holtmann chan->ops->resume(chan); 74074343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 74086be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 74090a708f8fSGustavo F. Padovan continue; 74100a708f8fSGustavo F. Padovan } 74110a708f8fSGustavo F. Padovan 741289bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 74136d3c15daSJohan Hedberg if (!status) 741493c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 74156d3c15daSJohan Hedberg else 7416ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 7417fa37c1aaSJohan Hedberg } else if (chan->state == BT_CONNECT2 && 7418fa37c1aaSJohan Hedberg chan->mode != L2CAP_MODE_LE_FLOWCTL) { 74190a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 7420df3c3931SJohan Hedberg __u16 res, stat; 74210a708f8fSGustavo F. Padovan 74220a708f8fSGustavo F. Padovan if (!status) { 7423bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 7424df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 7425df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 74262dc4e510SGustavo Padovan chan->ops->defer(chan); 7427df3c3931SJohan Hedberg } else { 7428acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 7429df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 7430df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 7431df3c3931SJohan Hedberg } 74320a708f8fSGustavo F. Padovan } else { 7433acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 7434ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 7435df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 7436df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 74370a708f8fSGustavo F. Padovan } 74380a708f8fSGustavo F. Padovan 7439fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 7440fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 7441df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 7442df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 7443fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 7444fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 74452d369359SMat Martineau 74462d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 74472d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 74482d369359SMat Martineau char buf[128]; 74492d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 74502d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 74512d369359SMat Martineau L2CAP_CONF_REQ, 74522d369359SMat Martineau l2cap_build_conf_req(chan, buf), 74532d369359SMat Martineau buf); 74542d369359SMat Martineau chan->num_conf_req++; 74552d369359SMat Martineau } 74560a708f8fSGustavo F. Padovan } 74570a708f8fSGustavo F. Padovan 74586be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 74590a708f8fSGustavo F. Padovan } 74600a708f8fSGustavo F. Padovan 74613df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 74620a708f8fSGustavo F. Padovan } 74630a708f8fSGustavo F. Padovan 74649b4c3336SArron Wang void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 74650a708f8fSGustavo F. Padovan { 74660a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 7467d73a0988SAndrei Emeltchenko struct l2cap_hdr *hdr; 7468d73a0988SAndrei Emeltchenko int len; 74690a708f8fSGustavo F. Padovan 74701d13a254SAndrei Emeltchenko /* For AMP controller do not create l2cap conn */ 7471ca8bee5dSMarcel Holtmann if (!conn && hcon->hdev->dev_type != HCI_PRIMARY) 74721d13a254SAndrei Emeltchenko goto drop; 74730a708f8fSGustavo F. Padovan 74740a708f8fSGustavo F. Padovan if (!conn) 7475baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 74760a708f8fSGustavo F. Padovan 74770a708f8fSGustavo F. Padovan if (!conn) 74780a708f8fSGustavo F. Padovan goto drop; 74790a708f8fSGustavo F. Padovan 74800a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 74810a708f8fSGustavo F. Padovan 7482d73a0988SAndrei Emeltchenko switch (flags) { 7483d73a0988SAndrei Emeltchenko case ACL_START: 7484d73a0988SAndrei Emeltchenko case ACL_START_NO_FLUSH: 7485d73a0988SAndrei Emeltchenko case ACL_COMPLETE: 74860a708f8fSGustavo F. Padovan if (conn->rx_len) { 74870a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 74880a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 74890a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 74900a708f8fSGustavo F. Padovan conn->rx_len = 0; 74910a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74920a708f8fSGustavo F. Padovan } 74930a708f8fSGustavo F. Padovan 74940a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 74950a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 74960a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 74970a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74980a708f8fSGustavo F. Padovan goto drop; 74990a708f8fSGustavo F. Padovan } 75000a708f8fSGustavo F. Padovan 75010a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 75020a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 75030a708f8fSGustavo F. Padovan 75040a708f8fSGustavo F. Padovan if (len == skb->len) { 75050a708f8fSGustavo F. Padovan /* Complete frame received */ 75060a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 75079b4c3336SArron Wang return; 75080a708f8fSGustavo F. Padovan } 75090a708f8fSGustavo F. Padovan 75100a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 75110a708f8fSGustavo F. Padovan 75120a708f8fSGustavo F. Padovan if (skb->len > len) { 75130a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 75140a708f8fSGustavo F. Padovan skb->len, len); 75150a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 75160a708f8fSGustavo F. Padovan goto drop; 75170a708f8fSGustavo F. Padovan } 75180a708f8fSGustavo F. Padovan 75190a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 75208bcde1f2SGustavo Padovan conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 75210a708f8fSGustavo F. Padovan if (!conn->rx_skb) 75220a708f8fSGustavo F. Padovan goto drop; 75230a708f8fSGustavo F. Padovan 75240a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 75250a708f8fSGustavo F. Padovan skb->len); 75260a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 7527d73a0988SAndrei Emeltchenko break; 7528d73a0988SAndrei Emeltchenko 7529d73a0988SAndrei Emeltchenko case ACL_CONT: 75300a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 75310a708f8fSGustavo F. Padovan 75320a708f8fSGustavo F. Padovan if (!conn->rx_len) { 75330a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 75340a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 75350a708f8fSGustavo F. Padovan goto drop; 75360a708f8fSGustavo F. Padovan } 75370a708f8fSGustavo F. Padovan 75380a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 75390a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 75400a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 75410a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 75420a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 75430a708f8fSGustavo F. Padovan conn->rx_len = 0; 75440a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 75450a708f8fSGustavo F. Padovan goto drop; 75460a708f8fSGustavo F. Padovan } 75470a708f8fSGustavo F. Padovan 75480a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 75490a708f8fSGustavo F. Padovan skb->len); 75500a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 75510a708f8fSGustavo F. Padovan 75520a708f8fSGustavo F. Padovan if (!conn->rx_len) { 7553c4e5bafaSJohan Hedberg /* Complete frame received. l2cap_recv_frame 7554c4e5bafaSJohan Hedberg * takes ownership of the skb so set the global 7555c4e5bafaSJohan Hedberg * rx_skb pointer to NULL first. 7556c4e5bafaSJohan Hedberg */ 7557c4e5bafaSJohan Hedberg struct sk_buff *rx_skb = conn->rx_skb; 75580a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 7559c4e5bafaSJohan Hedberg l2cap_recv_frame(conn, rx_skb); 75600a708f8fSGustavo F. Padovan } 7561d73a0988SAndrei Emeltchenko break; 75620a708f8fSGustavo F. Padovan } 75630a708f8fSGustavo F. Padovan 75640a708f8fSGustavo F. Padovan drop: 75650a708f8fSGustavo F. Padovan kfree_skb(skb); 75660a708f8fSGustavo F. Padovan } 75670a708f8fSGustavo F. Padovan 7568354fe804SJohan Hedberg static struct hci_cb l2cap_cb = { 7569354fe804SJohan Hedberg .name = "L2CAP", 7570539c496dSJohan Hedberg .connect_cfm = l2cap_connect_cfm, 75713a6d576bSJohan Hedberg .disconn_cfm = l2cap_disconn_cfm, 7572354fe804SJohan Hedberg .security_cfm = l2cap_security_cfm, 7573354fe804SJohan Hedberg }; 7574354fe804SJohan Hedberg 75750a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 75760a708f8fSGustavo F. Padovan { 757723691d75SGustavo F. Padovan struct l2cap_chan *c; 75780a708f8fSGustavo F. Padovan 7579333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 75800a708f8fSGustavo F. Padovan 758123691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 7582eeb5a067SMarcel Holtmann seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 7583eeb5a067SMarcel Holtmann &c->src, c->src_type, &c->dst, c->dst_type, 758489bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 758523691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 758623691d75SGustavo F. Padovan c->sec_level, c->mode); 75870a708f8fSGustavo F. Padovan } 75880a708f8fSGustavo F. Padovan 7589333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 75900a708f8fSGustavo F. Padovan 75910a708f8fSGustavo F. Padovan return 0; 75920a708f8fSGustavo F. Padovan } 75930a708f8fSGustavo F. Padovan 75940a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 75950a708f8fSGustavo F. Padovan { 75960a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 75970a708f8fSGustavo F. Padovan } 75980a708f8fSGustavo F. Padovan 75990a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 76000a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 76010a708f8fSGustavo F. Padovan .read = seq_read, 76020a708f8fSGustavo F. Padovan .llseek = seq_lseek, 76030a708f8fSGustavo F. Padovan .release = single_release, 76040a708f8fSGustavo F. Padovan }; 76050a708f8fSGustavo F. Padovan 76060a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 76070a708f8fSGustavo F. Padovan 760864274518SGustavo F. Padovan int __init l2cap_init(void) 76090a708f8fSGustavo F. Padovan { 76100a708f8fSGustavo F. Padovan int err; 76110a708f8fSGustavo F. Padovan 7612bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 76130a708f8fSGustavo F. Padovan if (err < 0) 76140a708f8fSGustavo F. Padovan return err; 76150a708f8fSGustavo F. Padovan 7616354fe804SJohan Hedberg hci_register_cb(&l2cap_cb); 7617354fe804SJohan Hedberg 76181120e4bfSMarcel Holtmann if (IS_ERR_OR_NULL(bt_debugfs)) 76191120e4bfSMarcel Holtmann return 0; 76201120e4bfSMarcel Holtmann 76212d792818SGustavo Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, 76222d792818SGustavo Padovan NULL, &l2cap_debugfs_fops); 76230a708f8fSGustavo F. Padovan 762440b9397aSSamuel Ortiz debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, 7625f15b8ecfSJohan Hedberg &le_max_credits); 762640b9397aSSamuel Ortiz debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, 7627f15b8ecfSJohan Hedberg &le_default_mps); 7628f15b8ecfSJohan Hedberg 76290a708f8fSGustavo F. Padovan return 0; 76300a708f8fSGustavo F. Padovan } 76310a708f8fSGustavo F. Padovan 763264274518SGustavo F. Padovan void l2cap_exit(void) 76330a708f8fSGustavo F. Padovan { 76340a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 7635354fe804SJohan Hedberg hci_unregister_cb(&l2cap_cb); 7636bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 76370a708f8fSGustavo F. Padovan } 76380a708f8fSGustavo F. Padovan 76390a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 76400a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 7641