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; 49d40bffbcSMarcel Holtmann static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, }; 500a708f8fSGustavo F. Padovan 51b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 52b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 530a708f8fSGustavo F. Padovan 54f15b8ecfSJohan Hedberg static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; 55f15b8ecfSJohan Hedberg static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; 56f15b8ecfSJohan Hedberg 570a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 580a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 594519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 604519de9aSGustavo F. Padovan void *data); 61710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 625e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); 630a708f8fSGustavo F. Padovan 64d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 65608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event); 66608bcc6dSMat Martineau 674f1654e0SMarcel Holtmann static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) 684f1654e0SMarcel Holtmann { 694f1654e0SMarcel Holtmann if (hcon->type == LE_LINK) { 704f1654e0SMarcel Holtmann if (type == ADDR_LE_DEV_PUBLIC) 714f1654e0SMarcel Holtmann return BDADDR_LE_PUBLIC; 724f1654e0SMarcel Holtmann else 734f1654e0SMarcel Holtmann return BDADDR_LE_RANDOM; 744f1654e0SMarcel Holtmann } 754f1654e0SMarcel Holtmann 764f1654e0SMarcel Holtmann return BDADDR_BREDR; 774f1654e0SMarcel Holtmann } 784f1654e0SMarcel Holtmann 790a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 8071ba0e56SGustavo F. Padovan 812d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 822d792818SGustavo Padovan u16 cid) 830a708f8fSGustavo F. Padovan { 843df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 85baa7e1faSGustavo F. Padovan 863df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 873df91ea2SAndrei Emeltchenko if (c->dcid == cid) 883df91ea2SAndrei Emeltchenko return c; 890a708f8fSGustavo F. Padovan } 903df91ea2SAndrei Emeltchenko return NULL; 91baa7e1faSGustavo F. Padovan } 920a708f8fSGustavo F. Padovan 932d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, 942d792818SGustavo Padovan u16 cid) 950a708f8fSGustavo F. Padovan { 963df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 97baa7e1faSGustavo F. Padovan 983df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 993df91ea2SAndrei Emeltchenko if (c->scid == cid) 1003df91ea2SAndrei Emeltchenko return c; 1010a708f8fSGustavo F. Padovan } 1023df91ea2SAndrei Emeltchenko return NULL; 103baa7e1faSGustavo F. Padovan } 1040a708f8fSGustavo F. Padovan 1050a708f8fSGustavo F. Padovan /* Find channel with given SCID. 106ef191adeSMat Martineau * Returns locked channel. */ 1072d792818SGustavo Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, 1082d792818SGustavo Padovan u16 cid) 1090a708f8fSGustavo F. Padovan { 11048454079SGustavo F. Padovan struct l2cap_chan *c; 111baa7e1faSGustavo F. Padovan 1123df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 113baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 114ef191adeSMat Martineau if (c) 115ef191adeSMat Martineau l2cap_chan_lock(c); 1163df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 1173df91ea2SAndrei Emeltchenko 11848454079SGustavo F. Padovan return c; 1190a708f8fSGustavo F. Padovan } 1200a708f8fSGustavo F. Padovan 121b1a130b7SMat Martineau /* Find channel with given DCID. 122b1a130b7SMat Martineau * Returns locked channel. 123b1a130b7SMat Martineau */ 124b1a130b7SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 125b1a130b7SMat Martineau u16 cid) 126b1a130b7SMat Martineau { 127b1a130b7SMat Martineau struct l2cap_chan *c; 128b1a130b7SMat Martineau 129b1a130b7SMat Martineau mutex_lock(&conn->chan_lock); 130b1a130b7SMat Martineau c = __l2cap_get_chan_by_dcid(conn, cid); 131b1a130b7SMat Martineau if (c) 132b1a130b7SMat Martineau l2cap_chan_lock(c); 133b1a130b7SMat Martineau mutex_unlock(&conn->chan_lock); 134b1a130b7SMat Martineau 135b1a130b7SMat Martineau return c; 136b1a130b7SMat Martineau } 137b1a130b7SMat Martineau 1382d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1392d792818SGustavo Padovan u8 ident) 1400a708f8fSGustavo F. Padovan { 1413df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 142baa7e1faSGustavo F. Padovan 1433df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1443df91ea2SAndrei Emeltchenko if (c->ident == ident) 1453df91ea2SAndrei Emeltchenko return c; 1460a708f8fSGustavo F. Padovan } 1473df91ea2SAndrei Emeltchenko return NULL; 148baa7e1faSGustavo F. Padovan } 1490a708f8fSGustavo F. Padovan 1505b155ef9SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1515b155ef9SMat Martineau u8 ident) 1525b155ef9SMat Martineau { 1535b155ef9SMat Martineau struct l2cap_chan *c; 1545b155ef9SMat Martineau 1555b155ef9SMat Martineau mutex_lock(&conn->chan_lock); 1565b155ef9SMat Martineau c = __l2cap_get_chan_by_ident(conn, ident); 1575b155ef9SMat Martineau if (c) 1585b155ef9SMat Martineau l2cap_chan_lock(c); 1595b155ef9SMat Martineau mutex_unlock(&conn->chan_lock); 1605b155ef9SMat Martineau 1615b155ef9SMat Martineau return c; 1625b155ef9SMat Martineau } 1635b155ef9SMat Martineau 16423691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1659e4425ffSGustavo F. Padovan { 16623691d75SGustavo F. Padovan struct l2cap_chan *c; 1679e4425ffSGustavo F. Padovan 16823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 1697eafc59eSMarcel Holtmann if (c->sport == psm && !bacmp(&c->src, src)) 17023691d75SGustavo F. Padovan return c; 1719e4425ffSGustavo F. Padovan } 172250938cbSSzymon Janc return NULL; 173250938cbSSzymon Janc } 1749e4425ffSGustavo F. Padovan 1759e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1769e4425ffSGustavo F. Padovan { 17773b2ec18SGustavo F. Padovan int err; 17873b2ec18SGustavo F. Padovan 179333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1809e4425ffSGustavo F. Padovan 18123691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 18273b2ec18SGustavo F. Padovan err = -EADDRINUSE; 18373b2ec18SGustavo F. Padovan goto done; 1849e4425ffSGustavo F. Padovan } 1859e4425ffSGustavo F. Padovan 18673b2ec18SGustavo F. Padovan if (psm) { 1879e4425ffSGustavo F. Padovan chan->psm = psm; 1889e4425ffSGustavo F. Padovan chan->sport = psm; 18973b2ec18SGustavo F. Padovan err = 0; 19073b2ec18SGustavo F. Padovan } else { 19173b2ec18SGustavo F. Padovan u16 p; 1929e4425ffSGustavo F. Padovan 19373b2ec18SGustavo F. Padovan err = -EINVAL; 19473b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 19523691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 19673b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 19773b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 19873b2ec18SGustavo F. Padovan err = 0; 19973b2ec18SGustavo F. Padovan break; 20073b2ec18SGustavo F. Padovan } 20173b2ec18SGustavo F. Padovan } 20273b2ec18SGustavo F. Padovan 20373b2ec18SGustavo F. Padovan done: 204333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 20573b2ec18SGustavo F. Padovan return err; 2069e4425ffSGustavo F. Padovan } 2076b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_add_psm); 2089e4425ffSGustavo F. Padovan 2099e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 2109e4425ffSGustavo F. Padovan { 211333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 2129e4425ffSGustavo F. Padovan 2139e4425ffSGustavo F. Padovan chan->scid = scid; 2149e4425ffSGustavo F. Padovan 215333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 2169e4425ffSGustavo F. Padovan 2179e4425ffSGustavo F. Padovan return 0; 2189e4425ffSGustavo F. Padovan } 2199e4425ffSGustavo F. Padovan 220baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2210a708f8fSGustavo F. Padovan { 222e77af755SJohan Hedberg u16 cid, dyn_end; 2230a708f8fSGustavo F. Padovan 224e77af755SJohan Hedberg if (conn->hcon->type == LE_LINK) 225e77af755SJohan Hedberg dyn_end = L2CAP_CID_LE_DYN_END; 226e77af755SJohan Hedberg else 227e77af755SJohan Hedberg dyn_end = L2CAP_CID_DYN_END; 228e77af755SJohan Hedberg 229e77af755SJohan Hedberg for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) { 230baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2310a708f8fSGustavo F. Padovan return cid; 2320a708f8fSGustavo F. Padovan } 2330a708f8fSGustavo F. Padovan 2340a708f8fSGustavo F. Padovan return 0; 2350a708f8fSGustavo F. Padovan } 2360a708f8fSGustavo F. Padovan 237f93fa273SGustavo Padovan static void l2cap_state_change(struct l2cap_chan *chan, int state) 23889bc500eSGustavo F. Padovan { 23942d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 240badaaa00SGustavo F. Padovan state_to_string(state)); 241badaaa00SGustavo F. Padovan 24289bc500eSGustavo F. Padovan chan->state = state; 24353f52121SGustavo Padovan chan->ops->state_change(chan, state, 0); 24489bc500eSGustavo F. Padovan } 24589bc500eSGustavo F. Padovan 246f8e73017SGustavo Padovan static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, 247f8e73017SGustavo Padovan int state, int err) 2482e0052e4SAndrei Emeltchenko { 249f8e73017SGustavo Padovan chan->state = state; 25053f52121SGustavo Padovan chan->ops->state_change(chan, chan->state, err); 2512e0052e4SAndrei Emeltchenko } 2522e0052e4SAndrei Emeltchenko 2532e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2542e0052e4SAndrei Emeltchenko { 255f8e73017SGustavo Padovan chan->ops->state_change(chan, chan->state, err); 2562e0052e4SAndrei Emeltchenko } 2572e0052e4SAndrei Emeltchenko 2584239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2594239d16fSMat Martineau { 2604239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2614239d16fSMat Martineau chan->retrans_timeout) { 2624239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2634239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2644239d16fSMat Martineau } 2654239d16fSMat Martineau } 2664239d16fSMat Martineau 2674239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2684239d16fSMat Martineau { 2694239d16fSMat Martineau __clear_retrans_timer(chan); 2704239d16fSMat Martineau if (chan->monitor_timeout) { 2714239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2724239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2734239d16fSMat Martineau } 2744239d16fSMat Martineau } 2754239d16fSMat Martineau 276608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 277608bcc6dSMat Martineau u16 seq) 278608bcc6dSMat Martineau { 279608bcc6dSMat Martineau struct sk_buff *skb; 280608bcc6dSMat Martineau 281608bcc6dSMat Martineau skb_queue_walk(head, skb) { 282608bcc6dSMat Martineau if (bt_cb(skb)->control.txseq == seq) 283608bcc6dSMat Martineau return skb; 284608bcc6dSMat Martineau } 285608bcc6dSMat Martineau 286608bcc6dSMat Martineau return NULL; 287608bcc6dSMat Martineau } 288608bcc6dSMat Martineau 2893c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 2903c588192SMat Martineau 2913c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 2923c588192SMat Martineau * SREJ requests that are received and for frames that are to be 2933c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 2943c588192SMat Martineau * list in an array, where membership in the list can also be checked 2953c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 2963c588192SMat Martineau * and removed from the head in constant time, without further memory 2973c588192SMat Martineau * allocs or frees. 2983c588192SMat Martineau */ 2993c588192SMat Martineau 3003c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 3013c588192SMat Martineau { 3023c588192SMat Martineau size_t alloc_size, i; 3033c588192SMat Martineau 3043c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 3053c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 3063c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 3073c588192SMat Martineau */ 3083c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 3093c588192SMat Martineau 3103c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 3113c588192SMat Martineau if (!seq_list->list) 3123c588192SMat Martineau return -ENOMEM; 3133c588192SMat Martineau 3143c588192SMat Martineau seq_list->mask = alloc_size - 1; 3153c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3163c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3173c588192SMat Martineau for (i = 0; i < alloc_size; i++) 3183c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3193c588192SMat Martineau 3203c588192SMat Martineau return 0; 3213c588192SMat Martineau } 3223c588192SMat Martineau 3233c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 3243c588192SMat Martineau { 3253c588192SMat Martineau kfree(seq_list->list); 3263c588192SMat Martineau } 3273c588192SMat Martineau 3283c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 3293c588192SMat Martineau u16 seq) 3303c588192SMat Martineau { 3313c588192SMat Martineau /* Constant-time check for list membership */ 3323c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 3333c588192SMat Martineau } 3343c588192SMat Martineau 33503a0c5d6SJohan Hedberg static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3363c588192SMat Martineau { 33703a0c5d6SJohan Hedberg u16 seq = seq_list->head; 3383c588192SMat Martineau u16 mask = seq_list->mask; 3393c588192SMat Martineau 3403c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 3413c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3423c588192SMat Martineau 3433c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3443c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3453c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3463c588192SMat Martineau } 3473c588192SMat Martineau 3483c588192SMat Martineau return seq; 3493c588192SMat Martineau } 3503c588192SMat Martineau 3513c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3523c588192SMat Martineau { 3533c588192SMat Martineau u16 i; 354f522ae36SGustavo Padovan 355f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 356f522ae36SGustavo Padovan return; 357f522ae36SGustavo Padovan 3583c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3593c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3603c588192SMat Martineau 3613c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3623c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3633c588192SMat Martineau } 3643c588192SMat Martineau 3653c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3663c588192SMat Martineau { 3673c588192SMat Martineau u16 mask = seq_list->mask; 3683c588192SMat Martineau 3693c588192SMat Martineau /* All appends happen in constant time */ 3703c588192SMat Martineau 371f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 372f522ae36SGustavo Padovan return; 373f522ae36SGustavo Padovan 3743c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3753c588192SMat Martineau seq_list->head = seq; 3763c588192SMat Martineau else 3773c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 3783c588192SMat Martineau 3793c588192SMat Martineau seq_list->tail = seq; 3803c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 3813c588192SMat Martineau } 3823c588192SMat Martineau 383721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 384ab07801dSGustavo F. Padovan { 385721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 386721c4181SGustavo F. Padovan chan_timer.work); 3873df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 388ab07801dSGustavo F. Padovan int reason; 389ab07801dSGustavo F. Padovan 390e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 391ab07801dSGustavo F. Padovan 3923df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3936be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 394ab07801dSGustavo F. Padovan 39589bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 396ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 39789bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 398ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 399ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 400ab07801dSGustavo F. Padovan else 401ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 402ab07801dSGustavo F. Padovan 4030f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 404ab07801dSGustavo F. Padovan 4056be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 406ab07801dSGustavo F. Padovan 40780b98027SGustavo Padovan chan->ops->close(chan); 4083df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4093df91ea2SAndrei Emeltchenko 410371fd835SUlisses Furquim l2cap_chan_put(chan); 411ab07801dSGustavo F. Padovan } 412ab07801dSGustavo F. Padovan 413eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 4140a708f8fSGustavo F. Padovan { 41548454079SGustavo F. Padovan struct l2cap_chan *chan; 4160a708f8fSGustavo F. Padovan 41748454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 41848454079SGustavo F. Padovan if (!chan) 41948454079SGustavo F. Padovan return NULL; 4200a708f8fSGustavo F. Padovan 421c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 422c03b355eSAndrei Emeltchenko 423333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 42423691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 425333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 42623691d75SGustavo F. Padovan 427721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 428ab07801dSGustavo F. Padovan 42989bc500eSGustavo F. Padovan chan->state = BT_OPEN; 43089bc500eSGustavo F. Padovan 431144ad330SSyam Sidhardhan kref_init(&chan->kref); 43271ba0e56SGustavo F. Padovan 4332827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4342827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4352827011fSMat Martineau 436eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 437abc545b8SSzymon Janc 43848454079SGustavo F. Padovan return chan; 4390a708f8fSGustavo F. Padovan } 4406b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_create); 4410a708f8fSGustavo F. Padovan 442144ad330SSyam Sidhardhan static void l2cap_chan_destroy(struct kref *kref) 4436ff5abbfSGustavo F. Padovan { 444144ad330SSyam Sidhardhan struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); 445144ad330SSyam Sidhardhan 4464af66c69SJaganath Kanakkassery BT_DBG("chan %p", chan); 4474af66c69SJaganath Kanakkassery 448333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 44923691d75SGustavo F. Padovan list_del(&chan->global_l); 450333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 45123691d75SGustavo F. Padovan 4524af66c69SJaganath Kanakkassery kfree(chan); 4536ff5abbfSGustavo F. Padovan } 4546ff5abbfSGustavo F. Padovan 45530648372SJaganath Kanakkassery void l2cap_chan_hold(struct l2cap_chan *c) 45630648372SJaganath Kanakkassery { 457144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 45830648372SJaganath Kanakkassery 459144ad330SSyam Sidhardhan kref_get(&c->kref); 46030648372SJaganath Kanakkassery } 46130648372SJaganath Kanakkassery 46230648372SJaganath Kanakkassery void l2cap_chan_put(struct l2cap_chan *c) 46330648372SJaganath Kanakkassery { 464144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 46530648372SJaganath Kanakkassery 466144ad330SSyam Sidhardhan kref_put(&c->kref, l2cap_chan_destroy); 46730648372SJaganath Kanakkassery } 4686b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_put); 46930648372SJaganath Kanakkassery 470bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 471bd4b1653SAndrei Emeltchenko { 472bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 473bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 474bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 475bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 4766a5e8165SJukka Rissanen chan->remote_max_tx = chan->max_tx; 4776a5e8165SJukka Rissanen chan->remote_tx_win = chan->tx_win; 478c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 479bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 4806a5e8165SJukka Rissanen chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; 4816a5e8165SJukka Rissanen chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; 4826a5e8165SJukka Rissanen chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; 4836a5e8165SJukka Rissanen chan->conf_state = 0; 484bd4b1653SAndrei Emeltchenko 485bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 486bd4b1653SAndrei Emeltchenko } 4876b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); 488bd4b1653SAndrei Emeltchenko 4890ce43ce6SJohan Hedberg static void l2cap_le_flowctl_init(struct l2cap_chan *chan) 49038319713SJohan Hedberg { 4910ce43ce6SJohan Hedberg chan->sdu = NULL; 4920ce43ce6SJohan Hedberg chan->sdu_last_frag = NULL; 4930ce43ce6SJohan Hedberg chan->sdu_len = 0; 4940cd75f7eSJohan Hedberg chan->tx_credits = 0; 495f15b8ecfSJohan Hedberg chan->rx_credits = le_max_credits; 496d1d79413SJohan Hedberg chan->mps = min_t(u16, chan->imtu, le_default_mps); 4970ce43ce6SJohan Hedberg 4980ce43ce6SJohan Hedberg skb_queue_head_init(&chan->tx_q); 49938319713SJohan Hedberg } 50038319713SJohan Hedberg 50193c3e8f5SAndrei Emeltchenko void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 5020a708f8fSGustavo F. Padovan { 5030a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 504097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 5050a708f8fSGustavo F. Padovan 5069f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 5070a708f8fSGustavo F. Padovan 5088c1d787bSGustavo F. Padovan chan->conn = conn; 5090a708f8fSGustavo F. Padovan 5105491120eSAndrei Emeltchenko switch (chan->chan_type) { 5115491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 5120a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 513fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 51421626e62SJohan Hedberg if (conn->hcon->type == ACL_LINK) 5150c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5165491120eSAndrei Emeltchenko break; 5175491120eSAndrei Emeltchenko 5185491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_LESS: 5190a708f8fSGustavo F. Padovan /* Connectionless socket */ 520fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_CONN_LESS; 521fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_CONN_LESS; 5220c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5235491120eSAndrei Emeltchenko break; 5245491120eSAndrei Emeltchenko 5252338a7e0SJohan Hedberg case L2CAP_CHAN_FIXED: 5262338a7e0SJohan Hedberg /* Caller will set CID and CID specific MTU values */ 527416fa752SAndrei Emeltchenko break; 528416fa752SAndrei Emeltchenko 5295491120eSAndrei Emeltchenko default: 5300a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 531fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 532fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 5330c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5340a708f8fSGustavo F. Padovan } 5350a708f8fSGustavo F. Padovan 5368f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 5378f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 5388f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 5398f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 5408f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 5418936fa6dSAndrei Emeltchenko chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; 5428f7975b1SAndrei Emeltchenko 543371fd835SUlisses Furquim l2cap_chan_hold(chan); 544baa7e1faSGustavo F. Padovan 5455ee9891dSJohan Hedberg hci_conn_hold(conn->hcon); 5465ee9891dSJohan Hedberg 5473df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 548643162a8SAndrei Emeltchenko } 549643162a8SAndrei Emeltchenko 550466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 551643162a8SAndrei Emeltchenko { 552643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 553643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5543df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5550a708f8fSGustavo F. Padovan } 5560a708f8fSGustavo F. Padovan 557466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5580a708f8fSGustavo F. Padovan { 5598c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5600a708f8fSGustavo F. Padovan 561c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5620a708f8fSGustavo F. Padovan 56349208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 5640a708f8fSGustavo F. Padovan 5650a708f8fSGustavo F. Padovan if (conn) { 56656f60984SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 567baa7e1faSGustavo F. Padovan /* Delete from channel list */ 5683df91ea2SAndrei Emeltchenko list_del(&chan->list); 5693d57dc68SGustavo F. Padovan 570371fd835SUlisses Furquim l2cap_chan_put(chan); 571baa7e1faSGustavo F. Padovan 5728c1d787bSGustavo F. Padovan chan->conn = NULL; 5733cabbfdaSAndrei Emeltchenko 5742338a7e0SJohan Hedberg if (chan->scid != L2CAP_CID_A2MP) 57576a68ba0SDavid Herrmann hci_conn_drop(conn->hcon); 57656f60984SAndrei Emeltchenko 57756f60984SAndrei Emeltchenko if (mgr && mgr->bredr_chan == chan) 57856f60984SAndrei Emeltchenko mgr->bredr_chan = NULL; 5790a708f8fSGustavo F. Padovan } 5800a708f8fSGustavo F. Padovan 581419e08c1SAndrei Emeltchenko if (chan->hs_hchan) { 582419e08c1SAndrei Emeltchenko struct hci_chan *hs_hchan = chan->hs_hchan; 583419e08c1SAndrei Emeltchenko 584419e08c1SAndrei Emeltchenko BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); 585419e08c1SAndrei Emeltchenko amp_disconnect_logical_link(hs_hchan); 586419e08c1SAndrei Emeltchenko } 587419e08c1SAndrei Emeltchenko 588c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, err); 5896be36555SAndrei Emeltchenko 5902827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 5916ff5abbfSGustavo F. Padovan return; 5922ead70b8SGustavo F. Padovan 593ee556f66SGustavo Padovan switch(chan->mode) { 594ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 595ee556f66SGustavo Padovan break; 5960a708f8fSGustavo F. Padovan 59738319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 598177f8f2bSJohan Hedberg skb_queue_purge(&chan->tx_q); 59938319713SJohan Hedberg break; 60038319713SJohan Hedberg 601ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 6021a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 6031a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 6041a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 6050a708f8fSGustavo F. Padovan 606f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 6070a708f8fSGustavo F. Padovan 6083c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 6093c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 610ee556f66SGustavo Padovan 611ee556f66SGustavo Padovan /* fall through */ 612ee556f66SGustavo Padovan 613ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 614ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 615ee556f66SGustavo Padovan break; 6160a708f8fSGustavo F. Padovan } 617ee556f66SGustavo Padovan 618ee556f66SGustavo Padovan return; 6190a708f8fSGustavo F. Padovan } 6206b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_del); 6210a708f8fSGustavo F. Padovan 622387a33e3SJohan Hedberg void l2cap_conn_update_id_addr(struct hci_conn *hcon) 623387a33e3SJohan Hedberg { 624387a33e3SJohan Hedberg struct l2cap_conn *conn = hcon->l2cap_data; 625387a33e3SJohan Hedberg struct l2cap_chan *chan; 626387a33e3SJohan Hedberg 627387a33e3SJohan Hedberg mutex_lock(&conn->chan_lock); 628387a33e3SJohan Hedberg 629387a33e3SJohan Hedberg list_for_each_entry(chan, &conn->chan_l, list) { 630387a33e3SJohan Hedberg l2cap_chan_lock(chan); 631387a33e3SJohan Hedberg bacpy(&chan->dst, &hcon->dst); 632387a33e3SJohan Hedberg chan->dst_type = bdaddr_type(hcon, hcon->dst_type); 633387a33e3SJohan Hedberg l2cap_chan_unlock(chan); 634387a33e3SJohan Hedberg } 635387a33e3SJohan Hedberg 636387a33e3SJohan Hedberg mutex_unlock(&conn->chan_lock); 637387a33e3SJohan Hedberg } 638387a33e3SJohan Hedberg 63927e2d4c8SJohan Hedberg static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) 64027e2d4c8SJohan Hedberg { 64127e2d4c8SJohan Hedberg struct l2cap_conn *conn = chan->conn; 64227e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 64327e2d4c8SJohan Hedberg u16 result; 64427e2d4c8SJohan Hedberg 64527e2d4c8SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) 64627e2d4c8SJohan Hedberg result = L2CAP_CR_AUTHORIZATION; 64727e2d4c8SJohan Hedberg else 64827e2d4c8SJohan Hedberg result = L2CAP_CR_BAD_PSM; 64927e2d4c8SJohan Hedberg 65027e2d4c8SJohan Hedberg l2cap_state_change(chan, BT_DISCONN); 65127e2d4c8SJohan Hedberg 65227e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 65327e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 6543916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 6550cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(chan->rx_credits); 65627e2d4c8SJohan Hedberg rsp.result = cpu_to_le16(result); 65727e2d4c8SJohan Hedberg 65827e2d4c8SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), 65927e2d4c8SJohan Hedberg &rsp); 66027e2d4c8SJohan Hedberg } 66127e2d4c8SJohan Hedberg 662791d60f7SJohan Hedberg static void l2cap_chan_connect_reject(struct l2cap_chan *chan) 663791d60f7SJohan Hedberg { 664791d60f7SJohan Hedberg struct l2cap_conn *conn = chan->conn; 665791d60f7SJohan Hedberg struct l2cap_conn_rsp rsp; 666791d60f7SJohan Hedberg u16 result; 667791d60f7SJohan Hedberg 668791d60f7SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) 669791d60f7SJohan Hedberg result = L2CAP_CR_SEC_BLOCK; 670791d60f7SJohan Hedberg else 671791d60f7SJohan Hedberg result = L2CAP_CR_BAD_PSM; 672791d60f7SJohan Hedberg 673791d60f7SJohan Hedberg l2cap_state_change(chan, BT_DISCONN); 674791d60f7SJohan Hedberg 675791d60f7SJohan Hedberg rsp.scid = cpu_to_le16(chan->dcid); 676791d60f7SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 677791d60f7SJohan Hedberg rsp.result = cpu_to_le16(result); 678dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 679791d60f7SJohan Hedberg 680791d60f7SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); 681791d60f7SJohan Hedberg } 682791d60f7SJohan Hedberg 6830f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 6844519de9aSGustavo F. Padovan { 6854519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6864519de9aSGustavo F. Padovan 6877eafc59eSMarcel Holtmann BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 6884519de9aSGustavo F. Padovan 68989bc500eSGustavo F. Padovan switch (chan->state) { 6904519de9aSGustavo F. Padovan case BT_LISTEN: 691c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6924519de9aSGustavo F. Padovan break; 6934519de9aSGustavo F. Padovan 6944519de9aSGustavo F. Padovan case BT_CONNECTED: 6954519de9aSGustavo F. Padovan case BT_CONFIG: 6967b25c9b3SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 6978d836d71SGustavo Padovan __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 6985e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, reason); 6994519de9aSGustavo F. Padovan } else 7004519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7014519de9aSGustavo F. Padovan break; 7024519de9aSGustavo F. Padovan 7034519de9aSGustavo F. Padovan case BT_CONNECT2: 704791d60f7SJohan Hedberg if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { 705791d60f7SJohan Hedberg if (conn->hcon->type == ACL_LINK) 706791d60f7SJohan Hedberg l2cap_chan_connect_reject(chan); 70727e2d4c8SJohan Hedberg else if (conn->hcon->type == LE_LINK) 70827e2d4c8SJohan Hedberg l2cap_chan_le_connect_reject(chan); 7094519de9aSGustavo F. Padovan } 7104519de9aSGustavo F. Padovan 7114519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7124519de9aSGustavo F. Padovan break; 7134519de9aSGustavo F. Padovan 7144519de9aSGustavo F. Padovan case BT_CONNECT: 7154519de9aSGustavo F. Padovan case BT_DISCONN: 7164519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 7174519de9aSGustavo F. Padovan break; 7184519de9aSGustavo F. Padovan 7194519de9aSGustavo F. Padovan default: 720c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 7214519de9aSGustavo F. Padovan break; 7224519de9aSGustavo F. Padovan } 7234519de9aSGustavo F. Padovan } 7246b8d4a6aSJukka Rissanen EXPORT_SYMBOL(l2cap_chan_close); 7254519de9aSGustavo F. Padovan 7264343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 7270a708f8fSGustavo F. Padovan { 7286a974b50SMarcel Holtmann switch (chan->chan_type) { 7296a974b50SMarcel Holtmann case L2CAP_CHAN_RAW: 7304343478fSGustavo F. Padovan switch (chan->sec_level) { 7310a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 7327d513e92SMarcel Holtmann case BT_SECURITY_FIPS: 7330a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 7340a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 7350a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 7360a708f8fSGustavo F. Padovan default: 7370a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7380a708f8fSGustavo F. Padovan } 7396a974b50SMarcel Holtmann break; 7403124b843SMarcel Holtmann case L2CAP_CHAN_CONN_LESS: 741dcf4adbfSJoe Perches if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { 7423124b843SMarcel Holtmann if (chan->sec_level == BT_SECURITY_LOW) 7433124b843SMarcel Holtmann chan->sec_level = BT_SECURITY_SDP; 7443124b843SMarcel Holtmann } 7457d513e92SMarcel Holtmann if (chan->sec_level == BT_SECURITY_HIGH || 7467d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 7473124b843SMarcel Holtmann return HCI_AT_NO_BONDING_MITM; 7483124b843SMarcel Holtmann else 7493124b843SMarcel Holtmann return HCI_AT_NO_BONDING; 7503124b843SMarcel Holtmann break; 7516a974b50SMarcel Holtmann case L2CAP_CHAN_CONN_ORIENTED: 752dcf4adbfSJoe Perches if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { 7534343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 7544343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 7550a708f8fSGustavo F. Padovan 7567d513e92SMarcel Holtmann if (chan->sec_level == BT_SECURITY_HIGH || 7577d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 7580a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 7590a708f8fSGustavo F. Padovan else 7600a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7616a974b50SMarcel Holtmann } 7626a974b50SMarcel Holtmann /* fall through */ 7636a974b50SMarcel Holtmann default: 7644343478fSGustavo F. Padovan switch (chan->sec_level) { 7650a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 7667d513e92SMarcel Holtmann case BT_SECURITY_FIPS: 7670a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 7680a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 7690a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 7700a708f8fSGustavo F. Padovan default: 7710a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7720a708f8fSGustavo F. Padovan } 7736a974b50SMarcel Holtmann break; 7740a708f8fSGustavo F. Padovan } 7750a708f8fSGustavo F. Padovan } 7760a708f8fSGustavo F. Padovan 7770a708f8fSGustavo F. Padovan /* Service level security */ 778d45fc423SGustavo F. Padovan int l2cap_chan_check_security(struct l2cap_chan *chan) 7790a708f8fSGustavo F. Padovan { 7808c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 7810a708f8fSGustavo F. Padovan __u8 auth_type; 7820a708f8fSGustavo F. Padovan 783a17de2feSJohan Hedberg if (conn->hcon->type == LE_LINK) 784a17de2feSJohan Hedberg return smp_conn_security(conn->hcon, chan->sec_level); 785a17de2feSJohan Hedberg 7864343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 7870a708f8fSGustavo F. Padovan 7884343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 7890a708f8fSGustavo F. Padovan } 7900a708f8fSGustavo F. Padovan 791b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 7920a708f8fSGustavo F. Padovan { 7930a708f8fSGustavo F. Padovan u8 id; 7940a708f8fSGustavo F. Padovan 7950a708f8fSGustavo F. Padovan /* Get next available identificator. 7960a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 7970a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 7980a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 7990a708f8fSGustavo F. Padovan */ 8000a708f8fSGustavo F. Padovan 801333055f2SGustavo F. Padovan spin_lock(&conn->lock); 8020a708f8fSGustavo F. Padovan 8030a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 8040a708f8fSGustavo F. Padovan conn->tx_ident = 1; 8050a708f8fSGustavo F. Padovan 8060a708f8fSGustavo F. Padovan id = conn->tx_ident; 8070a708f8fSGustavo F. Padovan 808333055f2SGustavo F. Padovan spin_unlock(&conn->lock); 8090a708f8fSGustavo F. Padovan 8100a708f8fSGustavo F. Padovan return id; 8110a708f8fSGustavo F. Padovan } 8120a708f8fSGustavo F. Padovan 8132d792818SGustavo Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 8142d792818SGustavo Padovan void *data) 8150a708f8fSGustavo F. Padovan { 8160a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 8170a708f8fSGustavo F. Padovan u8 flags; 8180a708f8fSGustavo F. Padovan 8190a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 8200a708f8fSGustavo F. Padovan 8210a708f8fSGustavo F. Padovan if (!skb) 8220a708f8fSGustavo F. Padovan return; 8230a708f8fSGustavo F. Padovan 8240a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 8250a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 8260a708f8fSGustavo F. Padovan else 8270a708f8fSGustavo F. Padovan flags = ACL_START; 8280a708f8fSGustavo F. Padovan 82914b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 8305e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 83114b12d0bSJaikumar Ganesh 83273d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 8330a708f8fSGustavo F. Padovan } 8340a708f8fSGustavo F. Padovan 83502b0fbb9SMat Martineau static bool __chan_is_moving(struct l2cap_chan *chan) 83602b0fbb9SMat Martineau { 83702b0fbb9SMat Martineau return chan->move_state != L2CAP_MOVE_STABLE && 83802b0fbb9SMat Martineau chan->move_state != L2CAP_MOVE_WAIT_PREPARE; 83902b0fbb9SMat Martineau } 84002b0fbb9SMat Martineau 84173d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 84273d80debSLuiz Augusto von Dentz { 84373d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 84473d80debSLuiz Augusto von Dentz u16 flags; 84573d80debSLuiz Augusto von Dentz 84673d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 84773d80debSLuiz Augusto von Dentz skb->priority); 84873d80debSLuiz Augusto von Dentz 849d5f8a75dSMat Martineau if (chan->hs_hcon && !__chan_is_moving(chan)) { 850d5f8a75dSMat Martineau if (chan->hs_hchan) 851d5f8a75dSMat Martineau hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); 852d5f8a75dSMat Martineau else 853d5f8a75dSMat Martineau kfree_skb(skb); 854d5f8a75dSMat Martineau 855d5f8a75dSMat Martineau return; 856d5f8a75dSMat Martineau } 857d5f8a75dSMat Martineau 85873d80debSLuiz Augusto von Dentz if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 85973d80debSLuiz Augusto von Dentz lmp_no_flush_capable(hcon->hdev)) 86073d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 86173d80debSLuiz Augusto von Dentz else 86273d80debSLuiz Augusto von Dentz flags = ACL_START; 86373d80debSLuiz Augusto von Dentz 86473d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 86573d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 8660a708f8fSGustavo F. Padovan } 8670a708f8fSGustavo F. Padovan 868b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 869b5c6aaedSMat Martineau { 870b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 871b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 872b5c6aaedSMat Martineau 873b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 874b5c6aaedSMat Martineau /* S-Frame */ 875b5c6aaedSMat Martineau control->sframe = 1; 876b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 877b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 878b5c6aaedSMat Martineau 879b5c6aaedSMat Martineau control->sar = 0; 880b5c6aaedSMat Martineau control->txseq = 0; 881b5c6aaedSMat Martineau } else { 882b5c6aaedSMat Martineau /* I-Frame */ 883b5c6aaedSMat Martineau control->sframe = 0; 884b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 885b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 886b5c6aaedSMat Martineau 887b5c6aaedSMat Martineau control->poll = 0; 888b5c6aaedSMat Martineau control->super = 0; 889b5c6aaedSMat Martineau } 890b5c6aaedSMat Martineau } 891b5c6aaedSMat Martineau 892b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 893b5c6aaedSMat Martineau { 894b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 895b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 896b5c6aaedSMat Martineau 897b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 898b5c6aaedSMat Martineau /* S-Frame */ 899b5c6aaedSMat Martineau control->sframe = 1; 900b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 901b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 902b5c6aaedSMat Martineau 903b5c6aaedSMat Martineau control->sar = 0; 904b5c6aaedSMat Martineau control->txseq = 0; 905b5c6aaedSMat Martineau } else { 906b5c6aaedSMat Martineau /* I-Frame */ 907b5c6aaedSMat Martineau control->sframe = 0; 908b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 909b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 910b5c6aaedSMat Martineau 911b5c6aaedSMat Martineau control->poll = 0; 912b5c6aaedSMat Martineau control->super = 0; 913b5c6aaedSMat Martineau } 914b5c6aaedSMat Martineau } 915b5c6aaedSMat Martineau 916b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 917b5c6aaedSMat Martineau struct sk_buff *skb) 918b5c6aaedSMat Martineau { 919b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 920b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 921b5c6aaedSMat Martineau &bt_cb(skb)->control); 922cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 923b5c6aaedSMat Martineau } else { 924b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 925b5c6aaedSMat Martineau &bt_cb(skb)->control); 926cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 927b5c6aaedSMat Martineau } 928b5c6aaedSMat Martineau } 929b5c6aaedSMat Martineau 930b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 931b5c6aaedSMat Martineau { 932b5c6aaedSMat Martineau u32 packed; 933b5c6aaedSMat Martineau 934b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 935b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 936b5c6aaedSMat Martineau 937b5c6aaedSMat Martineau if (control->sframe) { 938b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 939b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 940b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 941b5c6aaedSMat Martineau } else { 942b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 943b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 944b5c6aaedSMat Martineau } 945b5c6aaedSMat Martineau 946b5c6aaedSMat Martineau return packed; 947b5c6aaedSMat Martineau } 948b5c6aaedSMat Martineau 949b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 950b5c6aaedSMat Martineau { 951b5c6aaedSMat Martineau u16 packed; 952b5c6aaedSMat Martineau 953b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 954b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 955b5c6aaedSMat Martineau 956b5c6aaedSMat Martineau if (control->sframe) { 957b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 958b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 959b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 960b5c6aaedSMat Martineau } else { 961b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 962b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 963b5c6aaedSMat Martineau } 964b5c6aaedSMat Martineau 965b5c6aaedSMat Martineau return packed; 966b5c6aaedSMat Martineau } 967b5c6aaedSMat Martineau 968b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 969b5c6aaedSMat Martineau struct l2cap_ctrl *control, 970b5c6aaedSMat Martineau struct sk_buff *skb) 971b5c6aaedSMat Martineau { 972b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 973b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 974b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 975b5c6aaedSMat Martineau } else { 976b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 977b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 978b5c6aaedSMat Martineau } 979b5c6aaedSMat Martineau } 980b5c6aaedSMat Martineau 981ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 982ba7aa64fSGustavo Padovan { 983ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 984ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 985ba7aa64fSGustavo Padovan else 986ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 987ba7aa64fSGustavo Padovan } 988ba7aa64fSGustavo Padovan 989a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 990a67d7f6fSMat Martineau u32 control) 9910a708f8fSGustavo F. Padovan { 9920a708f8fSGustavo F. Padovan struct sk_buff *skb; 9930a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 994ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 9950a708f8fSGustavo F. Padovan 9960a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 99703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 9980a708f8fSGustavo F. Padovan 999a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 10000a708f8fSGustavo F. Padovan 10010a708f8fSGustavo F. Padovan if (!skb) 1002a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 10030a708f8fSGustavo F. Padovan 10040a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 10050a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 1006fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 100788843ab0SAndrei Emeltchenko 1008a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 1009a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 1010a67d7f6fSMat Martineau else 1011a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 10120a708f8fSGustavo F. Padovan 101347d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 1014a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 101503a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 10160a708f8fSGustavo F. Padovan } 10170a708f8fSGustavo F. Padovan 101873d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 1019a67d7f6fSMat Martineau return skb; 1020a67d7f6fSMat Martineau } 1021a67d7f6fSMat Martineau 1022a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 1023a67d7f6fSMat Martineau struct l2cap_ctrl *control) 1024a67d7f6fSMat Martineau { 1025a67d7f6fSMat Martineau struct sk_buff *skb; 1026a67d7f6fSMat Martineau u32 control_field; 1027a67d7f6fSMat Martineau 1028a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 1029a67d7f6fSMat Martineau 1030a67d7f6fSMat Martineau if (!control->sframe) 1031a67d7f6fSMat Martineau return; 1032a67d7f6fSMat Martineau 1033b99e13adSMat Martineau if (__chan_is_moving(chan)) 1034b99e13adSMat Martineau return; 1035b99e13adSMat Martineau 1036a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 1037a67d7f6fSMat Martineau !control->poll) 1038a67d7f6fSMat Martineau control->final = 1; 1039a67d7f6fSMat Martineau 1040a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 1041a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 1042a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 1043a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 1044a67d7f6fSMat Martineau 1045a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 1046a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 1047a67d7f6fSMat Martineau __clear_ack_timer(chan); 1048a67d7f6fSMat Martineau } 1049a67d7f6fSMat Martineau 1050a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 1051a67d7f6fSMat Martineau control->final, control->poll, control->super); 1052a67d7f6fSMat Martineau 1053a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 1054a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 1055a67d7f6fSMat Martineau else 1056a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 1057a67d7f6fSMat Martineau 1058a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 1059a67d7f6fSMat Martineau if (!IS_ERR(skb)) 106073d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 10610a708f8fSGustavo F. Padovan } 10620a708f8fSGustavo F. Padovan 1063c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 10640a708f8fSGustavo F. Padovan { 1065c9e3d5e0SMat Martineau struct l2cap_ctrl control; 10660a708f8fSGustavo F. Padovan 1067c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 1068c9e3d5e0SMat Martineau 1069c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 1070c9e3d5e0SMat Martineau control.sframe = 1; 1071c9e3d5e0SMat Martineau control.poll = poll; 1072c9e3d5e0SMat Martineau 1073c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 1074c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 1075c9e3d5e0SMat Martineau else 1076c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 1077c9e3d5e0SMat Martineau 1078c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 1079c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 10800a708f8fSGustavo F. Padovan } 10810a708f8fSGustavo F. Padovan 1082b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 10830a708f8fSGustavo F. Padovan { 1084c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 10850a708f8fSGustavo F. Padovan } 10860a708f8fSGustavo F. Padovan 108793c3e8f5SAndrei Emeltchenko static bool __amp_capable(struct l2cap_chan *chan) 108893c3e8f5SAndrei Emeltchenko { 108993c3e8f5SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 10901df7b17aSMarcel Holtmann struct hci_dev *hdev; 10911df7b17aSMarcel Holtmann bool amp_available = false; 109293c3e8f5SAndrei Emeltchenko 10931df7b17aSMarcel Holtmann if (!conn->hs_enabled) 10941df7b17aSMarcel Holtmann return false; 10951df7b17aSMarcel Holtmann 10961df7b17aSMarcel Holtmann if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) 10971df7b17aSMarcel Holtmann return false; 10981df7b17aSMarcel Holtmann 10991df7b17aSMarcel Holtmann read_lock(&hci_dev_list_lock); 11001df7b17aSMarcel Holtmann list_for_each_entry(hdev, &hci_dev_list, list) { 11011df7b17aSMarcel Holtmann if (hdev->amp_type != AMP_TYPE_BREDR && 11021df7b17aSMarcel Holtmann test_bit(HCI_UP, &hdev->flags)) { 11031df7b17aSMarcel Holtmann amp_available = true; 11041df7b17aSMarcel Holtmann break; 11051df7b17aSMarcel Holtmann } 11061df7b17aSMarcel Holtmann } 11071df7b17aSMarcel Holtmann read_unlock(&hci_dev_list_lock); 11081df7b17aSMarcel Holtmann 11091df7b17aSMarcel Holtmann if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) 11101df7b17aSMarcel Holtmann return amp_available; 1111848566b3SMarcel Holtmann 111293c3e8f5SAndrei Emeltchenko return false; 111393c3e8f5SAndrei Emeltchenko } 111493c3e8f5SAndrei Emeltchenko 11155ce66b59SAndrei Emeltchenko static bool l2cap_check_efs(struct l2cap_chan *chan) 11165ce66b59SAndrei Emeltchenko { 11175ce66b59SAndrei Emeltchenko /* Check EFS parameters */ 11185ce66b59SAndrei Emeltchenko return true; 11195ce66b59SAndrei Emeltchenko } 11205ce66b59SAndrei Emeltchenko 11212766be48SAndrei Emeltchenko void l2cap_send_conn_req(struct l2cap_chan *chan) 11229b27f350SAndrei Emeltchenko { 11239b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 11249b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 11259b27f350SAndrei Emeltchenko 11269b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 11279b27f350SAndrei Emeltchenko req.psm = chan->psm; 11289b27f350SAndrei Emeltchenko 11299b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 11309b27f350SAndrei Emeltchenko 11319b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 11329b27f350SAndrei Emeltchenko 11339b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 11349b27f350SAndrei Emeltchenko } 11359b27f350SAndrei Emeltchenko 11368eb200bdSMat Martineau static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) 11378eb200bdSMat Martineau { 11388eb200bdSMat Martineau struct l2cap_create_chan_req req; 11398eb200bdSMat Martineau req.scid = cpu_to_le16(chan->scid); 11408eb200bdSMat Martineau req.psm = chan->psm; 11418eb200bdSMat Martineau req.amp_id = amp_id; 11428eb200bdSMat Martineau 11438eb200bdSMat Martineau chan->ident = l2cap_get_ident(chan->conn); 11448eb200bdSMat Martineau 11458eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, 11468eb200bdSMat Martineau sizeof(req), &req); 11478eb200bdSMat Martineau } 11488eb200bdSMat Martineau 114902b0fbb9SMat Martineau static void l2cap_move_setup(struct l2cap_chan *chan) 115002b0fbb9SMat Martineau { 115102b0fbb9SMat Martineau struct sk_buff *skb; 115202b0fbb9SMat Martineau 115302b0fbb9SMat Martineau BT_DBG("chan %p", chan); 115402b0fbb9SMat Martineau 115502b0fbb9SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 115602b0fbb9SMat Martineau return; 115702b0fbb9SMat Martineau 115802b0fbb9SMat Martineau __clear_retrans_timer(chan); 115902b0fbb9SMat Martineau __clear_monitor_timer(chan); 116002b0fbb9SMat Martineau __clear_ack_timer(chan); 116102b0fbb9SMat Martineau 116202b0fbb9SMat Martineau chan->retry_count = 0; 116302b0fbb9SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 116402b0fbb9SMat Martineau if (bt_cb(skb)->control.retries) 116502b0fbb9SMat Martineau bt_cb(skb)->control.retries = 1; 116602b0fbb9SMat Martineau else 116702b0fbb9SMat Martineau break; 116802b0fbb9SMat Martineau } 116902b0fbb9SMat Martineau 117002b0fbb9SMat Martineau chan->expected_tx_seq = chan->buffer_seq; 117102b0fbb9SMat Martineau 117202b0fbb9SMat Martineau clear_bit(CONN_REJ_ACT, &chan->conn_state); 117302b0fbb9SMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 117402b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 117502b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->srej_list); 117602b0fbb9SMat Martineau skb_queue_purge(&chan->srej_q); 117702b0fbb9SMat Martineau 117802b0fbb9SMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 117902b0fbb9SMat Martineau chan->rx_state = L2CAP_RX_STATE_MOVE; 118002b0fbb9SMat Martineau 118102b0fbb9SMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 118202b0fbb9SMat Martineau } 118302b0fbb9SMat Martineau 11845f3847a4SMat Martineau static void l2cap_move_done(struct l2cap_chan *chan) 11855f3847a4SMat Martineau { 11865f3847a4SMat Martineau u8 move_role = chan->move_role; 11875f3847a4SMat Martineau BT_DBG("chan %p", chan); 11885f3847a4SMat Martineau 11895f3847a4SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 11905f3847a4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 11915f3847a4SMat Martineau 11925f3847a4SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 11935f3847a4SMat Martineau return; 11945f3847a4SMat Martineau 11955f3847a4SMat Martineau switch (move_role) { 11965f3847a4SMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 11975f3847a4SMat Martineau l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); 11985f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_F; 11995f3847a4SMat Martineau break; 12005f3847a4SMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 12015f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_P; 12025f3847a4SMat Martineau break; 12035f3847a4SMat Martineau } 12045f3847a4SMat Martineau } 12055f3847a4SMat Martineau 12069f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 12079f0caeb1SVinicius Costa Gomes { 12082827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 12099f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 12109f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 12119f0caeb1SVinicius Costa Gomes 12120ce43ce6SJohan Hedberg if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) 12130ce43ce6SJohan Hedberg chan->ops->suspend(chan); 1214177f8f2bSJohan Hedberg 121554a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 12169f0caeb1SVinicius Costa Gomes 121754a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 12189f0caeb1SVinicius Costa Gomes } 12199f0caeb1SVinicius Costa Gomes 1220f1496deeSJohan Hedberg static void l2cap_le_connect(struct l2cap_chan *chan) 1221f1496deeSJohan Hedberg { 1222f1496deeSJohan Hedberg struct l2cap_conn *conn = chan->conn; 1223f1496deeSJohan Hedberg struct l2cap_le_conn_req req; 1224f1496deeSJohan Hedberg 1225595177f3SJohan Hedberg if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) 1226595177f3SJohan Hedberg return; 1227595177f3SJohan Hedberg 1228f1496deeSJohan Hedberg req.psm = chan->psm; 1229f1496deeSJohan Hedberg req.scid = cpu_to_le16(chan->scid); 1230f1496deeSJohan Hedberg req.mtu = cpu_to_le16(chan->imtu); 12313916aed8SJohan Hedberg req.mps = cpu_to_le16(chan->mps); 12320cd75f7eSJohan Hedberg req.credits = cpu_to_le16(chan->rx_credits); 1233f1496deeSJohan Hedberg 1234f1496deeSJohan Hedberg chan->ident = l2cap_get_ident(conn); 1235f1496deeSJohan Hedberg 1236f1496deeSJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, 1237f1496deeSJohan Hedberg sizeof(req), &req); 1238f1496deeSJohan Hedberg } 1239f1496deeSJohan Hedberg 1240f1496deeSJohan Hedberg static void l2cap_le_start(struct l2cap_chan *chan) 1241f1496deeSJohan Hedberg { 1242f1496deeSJohan Hedberg struct l2cap_conn *conn = chan->conn; 1243f1496deeSJohan Hedberg 1244f1496deeSJohan Hedberg if (!smp_conn_security(conn->hcon, chan->sec_level)) 1245f1496deeSJohan Hedberg return; 1246f1496deeSJohan Hedberg 1247f1496deeSJohan Hedberg if (!chan->psm) { 1248f1496deeSJohan Hedberg l2cap_chan_ready(chan); 1249f1496deeSJohan Hedberg return; 1250f1496deeSJohan Hedberg } 1251f1496deeSJohan Hedberg 1252f1496deeSJohan Hedberg if (chan->state == BT_CONNECT) 1253f1496deeSJohan Hedberg l2cap_le_connect(chan); 1254f1496deeSJohan Hedberg } 1255f1496deeSJohan Hedberg 125693c3e8f5SAndrei Emeltchenko static void l2cap_start_connection(struct l2cap_chan *chan) 125793c3e8f5SAndrei Emeltchenko { 125893c3e8f5SAndrei Emeltchenko if (__amp_capable(chan)) { 125993c3e8f5SAndrei Emeltchenko BT_DBG("chan %p AMP capable: discover AMPs", chan); 126093c3e8f5SAndrei Emeltchenko a2mp_discover_amp(chan); 1261f1496deeSJohan Hedberg } else if (chan->conn->hcon->type == LE_LINK) { 1262f1496deeSJohan Hedberg l2cap_le_start(chan); 126393c3e8f5SAndrei Emeltchenko } else { 126493c3e8f5SAndrei Emeltchenko l2cap_send_conn_req(chan); 126593c3e8f5SAndrei Emeltchenko } 126693c3e8f5SAndrei Emeltchenko } 126793c3e8f5SAndrei Emeltchenko 1268fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 12690a708f8fSGustavo F. Padovan { 12708c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 12710a708f8fSGustavo F. Padovan 12729f0caeb1SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 127396ac34fbSJohan Hedberg l2cap_le_start(chan); 12749f0caeb1SVinicius Costa Gomes return; 12759f0caeb1SVinicius Costa Gomes } 12769f0caeb1SVinicius Costa Gomes 12770a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 12780a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 12790a708f8fSGustavo F. Padovan return; 12800a708f8fSGustavo F. Padovan 1281d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan) && 128293c3e8f5SAndrei Emeltchenko __l2cap_no_conn_pending(chan)) { 128393c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 128493c3e8f5SAndrei Emeltchenko } 12850a708f8fSGustavo F. Padovan } else { 12860a708f8fSGustavo F. Padovan struct l2cap_info_req req; 1287dcf4adbfSJoe Perches req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 12880a708f8fSGustavo F. Padovan 12890a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 12900a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 12910a708f8fSGustavo F. Padovan 1292ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 12930a708f8fSGustavo F. Padovan 12942d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 12952d792818SGustavo Padovan sizeof(req), &req); 12960a708f8fSGustavo F. Padovan } 12970a708f8fSGustavo F. Padovan } 12980a708f8fSGustavo F. Padovan 12990a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 13000a708f8fSGustavo F. Padovan { 13010a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 13020a708f8fSGustavo F. Padovan if (!disable_ertm) 13030a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 13040a708f8fSGustavo F. Padovan 13050a708f8fSGustavo F. Padovan switch (mode) { 13060a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 13070a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 13080a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 13090a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 13100a708f8fSGustavo F. Padovan default: 13110a708f8fSGustavo F. Padovan return 0x00; 13120a708f8fSGustavo F. Padovan } 13130a708f8fSGustavo F. Padovan } 13140a708f8fSGustavo F. Padovan 13155e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) 13160a708f8fSGustavo F. Padovan { 13175e4e3972SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 13180a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 13190a708f8fSGustavo F. Padovan 13200a708f8fSGustavo F. Padovan if (!conn) 13210a708f8fSGustavo F. Padovan return; 13220a708f8fSGustavo F. Padovan 1323aad3d0e3SAndrei Emeltchenko if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { 13241a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 13251a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 13261a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 13270a708f8fSGustavo F. Padovan } 13280a708f8fSGustavo F. Padovan 13292338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 1330d117773cSGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 1331416fa752SAndrei Emeltchenko return; 1332416fa752SAndrei Emeltchenko } 1333416fa752SAndrei Emeltchenko 1334fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1335fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 13362d792818SGustavo Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, 13372d792818SGustavo Padovan sizeof(req), &req); 13380a708f8fSGustavo F. Padovan 1339f8e73017SGustavo Padovan l2cap_state_change_and_error(chan, BT_DISCONN, err); 13400a708f8fSGustavo F. Padovan } 13410a708f8fSGustavo F. Padovan 13420a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 13430a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 13440a708f8fSGustavo F. Padovan { 13453df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 13460a708f8fSGustavo F. Padovan 13470a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 13480a708f8fSGustavo F. Padovan 13493df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 13500a708f8fSGustavo F. Padovan 13513df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 13526be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 13530a708f8fSGustavo F. Padovan 1354715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 13556be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 13560a708f8fSGustavo F. Padovan continue; 13570a708f8fSGustavo F. Padovan } 13580a708f8fSGustavo F. Padovan 135989bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1360d45fc423SGustavo F. Padovan if (!l2cap_chan_check_security(chan) || 1361b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 13626be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 13630a708f8fSGustavo F. Padovan continue; 13640a708f8fSGustavo F. Padovan } 13650a708f8fSGustavo F. Padovan 1366c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1367c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1368c1360a1cSGustavo F. Padovan &chan->conf_state)) { 13690f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 13706be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 13710a708f8fSGustavo F. Padovan continue; 13720a708f8fSGustavo F. Padovan } 13730a708f8fSGustavo F. Padovan 137493c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 13750a708f8fSGustavo F. Padovan 137689bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 13770a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 13780a708f8fSGustavo F. Padovan char buf[128]; 1379fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1380fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 13810a708f8fSGustavo F. Padovan 1382d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 1383bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 1384dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_PEND); 1385dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 13862dc4e510SGustavo Padovan chan->ops->defer(chan); 13870a708f8fSGustavo F. Padovan 13880a708f8fSGustavo F. Padovan } else { 1389acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 1390dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 1391dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 13920a708f8fSGustavo F. Padovan } 13930a708f8fSGustavo F. Padovan } else { 1394dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_PEND); 1395dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 13960a708f8fSGustavo F. Padovan } 13970a708f8fSGustavo F. Padovan 1398fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1399fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 14000a708f8fSGustavo F. Padovan 1401c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 14020a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 14036be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14040a708f8fSGustavo F. Padovan continue; 14050a708f8fSGustavo F. Padovan } 14060a708f8fSGustavo F. Padovan 1407c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 14080a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 140973ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 141073ffa904SGustavo F. Padovan chan->num_conf_req++; 14110a708f8fSGustavo F. Padovan } 14120a708f8fSGustavo F. Padovan 14136be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14140a708f8fSGustavo F. Padovan } 14150a708f8fSGustavo F. Padovan 14163df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14170a708f8fSGustavo F. Padovan } 14180a708f8fSGustavo F. Padovan 1419c2287681SIdo Yariv /* Find socket with cid and source/destination bdaddr. 1420b62f328bSVille Tervo * Returns closest match, locked. 1421b62f328bSVille Tervo */ 1422d9b88702SAndrei Emeltchenko static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, 1423c2287681SIdo Yariv bdaddr_t *src, 1424c2287681SIdo Yariv bdaddr_t *dst) 1425b62f328bSVille Tervo { 142623691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 1427b62f328bSVille Tervo 142823691d75SGustavo F. Padovan read_lock(&chan_list_lock); 1429b62f328bSVille Tervo 143023691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 143189bc500eSGustavo F. Padovan if (state && c->state != state) 1432b62f328bSVille Tervo continue; 1433b62f328bSVille Tervo 143423691d75SGustavo F. Padovan if (c->scid == cid) { 1435c2287681SIdo Yariv int src_match, dst_match; 1436c2287681SIdo Yariv int src_any, dst_any; 1437c2287681SIdo Yariv 1438b62f328bSVille Tervo /* Exact match. */ 14397eafc59eSMarcel Holtmann src_match = !bacmp(&c->src, src); 14407eafc59eSMarcel Holtmann dst_match = !bacmp(&c->dst, dst); 1441c2287681SIdo Yariv if (src_match && dst_match) { 144223691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 144323691d75SGustavo F. Padovan return c; 144423691d75SGustavo F. Padovan } 1445b62f328bSVille Tervo 1446b62f328bSVille Tervo /* Closest match */ 14477eafc59eSMarcel Holtmann src_any = !bacmp(&c->src, BDADDR_ANY); 14487eafc59eSMarcel Holtmann dst_any = !bacmp(&c->dst, BDADDR_ANY); 1449c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1450c2287681SIdo Yariv (src_any && dst_any)) 145123691d75SGustavo F. Padovan c1 = c; 1452b62f328bSVille Tervo } 1453b62f328bSVille Tervo } 1454280f294fSGustavo F. Padovan 145523691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 1456b62f328bSVille Tervo 145723691d75SGustavo F. Padovan return c1; 1458b62f328bSVille Tervo } 1459b62f328bSVille Tervo 1460b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1461b62f328bSVille Tervo { 1462cc8dba2bSMarcel Holtmann struct hci_conn *hcon = conn->hcon; 146323691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 1464cc8dba2bSMarcel Holtmann u8 dst_type; 1465b62f328bSVille Tervo 1466b62f328bSVille Tervo BT_DBG(""); 1467b62f328bSVille Tervo 1468b62f328bSVille Tervo /* Check if we have socket listening on cid */ 1469073d1cf3SJohan Hedberg pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, 1470cc8dba2bSMarcel Holtmann &hcon->src, &hcon->dst); 147123691d75SGustavo F. Padovan if (!pchan) 1472b62f328bSVille Tervo return; 1473b62f328bSVille Tervo 147444f3b0fbSJohan Hedberg /* Client ATT sockets should override the server one */ 147544f3b0fbSJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) 147644f3b0fbSJohan Hedberg return; 147744f3b0fbSJohan Hedberg 1478cc8dba2bSMarcel Holtmann dst_type = bdaddr_type(hcon, hcon->dst_type); 1479cc8dba2bSMarcel Holtmann 1480cc8dba2bSMarcel Holtmann /* If device is blocked, do not create a channel for it */ 1481cc8dba2bSMarcel Holtmann if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) 1482cc8dba2bSMarcel Holtmann return; 1483cc8dba2bSMarcel Holtmann 148480afeb6cSMarcel Holtmann /* For LE slave connections, make sure the connection interval 148580afeb6cSMarcel Holtmann * is in the range of the minium and maximum interval that has 148680afeb6cSMarcel Holtmann * been configured for this connection. If not, then trigger 148780afeb6cSMarcel Holtmann * the connection update procedure. 148880afeb6cSMarcel Holtmann */ 14894dae2798SJohan Hedberg if (!test_bit(HCI_CONN_MASTER, &hcon->flags) && 149080afeb6cSMarcel Holtmann (hcon->le_conn_interval < hcon->le_conn_min_interval || 149180afeb6cSMarcel Holtmann hcon->le_conn_interval > hcon->le_conn_max_interval)) { 149280afeb6cSMarcel Holtmann struct l2cap_conn_param_update_req req; 149380afeb6cSMarcel Holtmann 149480afeb6cSMarcel Holtmann req.min = cpu_to_le16(hcon->le_conn_min_interval); 149580afeb6cSMarcel Holtmann req.max = cpu_to_le16(hcon->le_conn_max_interval); 149680afeb6cSMarcel Holtmann req.latency = cpu_to_le16(hcon->le_conn_latency); 149780afeb6cSMarcel Holtmann req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); 149880afeb6cSMarcel Holtmann 149980afeb6cSMarcel Holtmann l2cap_send_cmd(conn, l2cap_get_ident(conn), 150080afeb6cSMarcel Holtmann L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); 150180afeb6cSMarcel Holtmann } 150280afeb6cSMarcel Holtmann 15038ffb9290SGustavo Padovan l2cap_chan_lock(pchan); 150462f3a2cfSGustavo F. Padovan 150580b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 150680808e43SGustavo F. Padovan if (!chan) 1507b62f328bSVille Tervo goto clean; 1508b62f328bSVille Tervo 1509cc8dba2bSMarcel Holtmann bacpy(&chan->src, &hcon->src); 1510cc8dba2bSMarcel Holtmann bacpy(&chan->dst, &hcon->dst); 1511cc8dba2bSMarcel Holtmann chan->src_type = bdaddr_type(hcon, hcon->src_type); 1512cc8dba2bSMarcel Holtmann chan->dst_type = dst_type; 1513b62f328bSVille Tervo 151444f3b0fbSJohan Hedberg __l2cap_chan_add(conn, chan); 151548454079SGustavo F. Padovan 1516b62f328bSVille Tervo clean: 15178ffb9290SGustavo Padovan l2cap_chan_unlock(pchan); 1518b62f328bSVille Tervo } 1519b62f328bSVille Tervo 15200a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 15210a708f8fSGustavo F. Padovan { 152248454079SGustavo F. Padovan struct l2cap_chan *chan; 1523cc110922SVinicius Costa Gomes struct hci_conn *hcon = conn->hcon; 15240a708f8fSGustavo F. Padovan 15250a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 15260a708f8fSGustavo F. Padovan 1527d8729922SJohan Hedberg /* For outgoing pairing which doesn't necessarily have an 1528d8729922SJohan Hedberg * associated socket (e.g. mgmt_pair_device). 1529d8729922SJohan Hedberg */ 1530cc110922SVinicius Costa Gomes if (hcon->out && hcon->type == LE_LINK) 1531cc110922SVinicius Costa Gomes smp_conn_security(hcon, hcon->pending_sec_level); 1532160dc6acSVinicius Costa Gomes 15333df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 15340a708f8fSGustavo F. Padovan 153544f3b0fbSJohan Hedberg if (hcon->type == LE_LINK) 153644f3b0fbSJohan Hedberg l2cap_le_conn_ready(conn); 153744f3b0fbSJohan Hedberg 15383df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1539baa7e1faSGustavo F. Padovan 15406be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 15410a708f8fSGustavo F. Padovan 15422338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 1543416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1544416fa752SAndrei Emeltchenko continue; 1545416fa752SAndrei Emeltchenko } 1546416fa752SAndrei Emeltchenko 1547cc110922SVinicius Costa Gomes if (hcon->type == LE_LINK) { 1548f1496deeSJohan Hedberg l2cap_le_start(chan); 154963128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 155074e75740SGustavo Padovan l2cap_chan_ready(chan); 1551b501d6a1SAnderson Briglia 15521c244f79SGustavo Padovan } else if (chan->state == BT_CONNECT) { 1553fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 15541c244f79SGustavo Padovan } 15550a708f8fSGustavo F. Padovan 15566be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 15570a708f8fSGustavo F. Padovan } 15580a708f8fSGustavo F. Padovan 15593df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 156061a939c6SJohan Hedberg 156161a939c6SJohan Hedberg queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); 15620a708f8fSGustavo F. Padovan } 15630a708f8fSGustavo F. Padovan 15640a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 15650a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 15660a708f8fSGustavo F. Padovan { 156748454079SGustavo F. Padovan struct l2cap_chan *chan; 15680a708f8fSGustavo F. Padovan 15690a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 15700a708f8fSGustavo F. Padovan 15713df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 15720a708f8fSGustavo F. Padovan 15733df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1574ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 15751d8b1fd5SGustavo Padovan l2cap_chan_set_err(chan, err); 15760a708f8fSGustavo F. Padovan } 15770a708f8fSGustavo F. Padovan 15783df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 15790a708f8fSGustavo F. Padovan } 15800a708f8fSGustavo F. Padovan 1581f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 15820a708f8fSGustavo F. Padovan { 1583f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1584030013d8SGustavo F. Padovan info_timer.work); 15850a708f8fSGustavo F. Padovan 15860a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 15870a708f8fSGustavo F. Padovan conn->info_ident = 0; 15880a708f8fSGustavo F. Padovan 15890a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 15900a708f8fSGustavo F. Padovan } 15910a708f8fSGustavo F. Padovan 15922c8e1411SDavid Herrmann /* 15932c8e1411SDavid Herrmann * l2cap_user 15942c8e1411SDavid Herrmann * External modules can register l2cap_user objects on l2cap_conn. The ->probe 15952c8e1411SDavid Herrmann * callback is called during registration. The ->remove callback is called 15962c8e1411SDavid Herrmann * during unregistration. 15972c8e1411SDavid Herrmann * An l2cap_user object can either be explicitly unregistered or when the 15982c8e1411SDavid Herrmann * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, 15992c8e1411SDavid Herrmann * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. 16002c8e1411SDavid Herrmann * External modules must own a reference to the l2cap_conn object if they intend 16012c8e1411SDavid Herrmann * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at 16022c8e1411SDavid Herrmann * any time if they don't. 16032c8e1411SDavid Herrmann */ 16042c8e1411SDavid Herrmann 16052c8e1411SDavid Herrmann int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) 16062c8e1411SDavid Herrmann { 16072c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 16082c8e1411SDavid Herrmann int ret; 16092c8e1411SDavid Herrmann 16102c8e1411SDavid Herrmann /* We need to check whether l2cap_conn is registered. If it is not, we 16112c8e1411SDavid Herrmann * must not register the l2cap_user. l2cap_conn_del() is unregisters 16122c8e1411SDavid Herrmann * l2cap_conn objects, but doesn't provide its own locking. Instead, it 16132c8e1411SDavid Herrmann * relies on the parent hci_conn object to be locked. This itself relies 16142c8e1411SDavid Herrmann * on the hci_dev object to be locked. So we must lock the hci device 16152c8e1411SDavid Herrmann * here, too. */ 16162c8e1411SDavid Herrmann 16172c8e1411SDavid Herrmann hci_dev_lock(hdev); 16182c8e1411SDavid Herrmann 16192c8e1411SDavid Herrmann if (user->list.next || user->list.prev) { 16202c8e1411SDavid Herrmann ret = -EINVAL; 16212c8e1411SDavid Herrmann goto out_unlock; 16222c8e1411SDavid Herrmann } 16232c8e1411SDavid Herrmann 16242c8e1411SDavid Herrmann /* conn->hchan is NULL after l2cap_conn_del() was called */ 16252c8e1411SDavid Herrmann if (!conn->hchan) { 16262c8e1411SDavid Herrmann ret = -ENODEV; 16272c8e1411SDavid Herrmann goto out_unlock; 16282c8e1411SDavid Herrmann } 16292c8e1411SDavid Herrmann 16302c8e1411SDavid Herrmann ret = user->probe(conn, user); 16312c8e1411SDavid Herrmann if (ret) 16322c8e1411SDavid Herrmann goto out_unlock; 16332c8e1411SDavid Herrmann 16342c8e1411SDavid Herrmann list_add(&user->list, &conn->users); 16352c8e1411SDavid Herrmann ret = 0; 16362c8e1411SDavid Herrmann 16372c8e1411SDavid Herrmann out_unlock: 16382c8e1411SDavid Herrmann hci_dev_unlock(hdev); 16392c8e1411SDavid Herrmann return ret; 16402c8e1411SDavid Herrmann } 16412c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_register_user); 16422c8e1411SDavid Herrmann 16432c8e1411SDavid Herrmann void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) 16442c8e1411SDavid Herrmann { 16452c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 16462c8e1411SDavid Herrmann 16472c8e1411SDavid Herrmann hci_dev_lock(hdev); 16482c8e1411SDavid Herrmann 16492c8e1411SDavid Herrmann if (!user->list.next || !user->list.prev) 16502c8e1411SDavid Herrmann goto out_unlock; 16512c8e1411SDavid Herrmann 16522c8e1411SDavid Herrmann list_del(&user->list); 16532c8e1411SDavid Herrmann user->list.next = NULL; 16542c8e1411SDavid Herrmann user->list.prev = NULL; 16552c8e1411SDavid Herrmann user->remove(conn, user); 16562c8e1411SDavid Herrmann 16572c8e1411SDavid Herrmann out_unlock: 16582c8e1411SDavid Herrmann hci_dev_unlock(hdev); 16592c8e1411SDavid Herrmann } 16602c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_unregister_user); 16612c8e1411SDavid Herrmann 16622c8e1411SDavid Herrmann static void l2cap_unregister_all_users(struct l2cap_conn *conn) 16632c8e1411SDavid Herrmann { 16642c8e1411SDavid Herrmann struct l2cap_user *user; 16652c8e1411SDavid Herrmann 16662c8e1411SDavid Herrmann while (!list_empty(&conn->users)) { 16672c8e1411SDavid Herrmann user = list_first_entry(&conn->users, struct l2cap_user, list); 16682c8e1411SDavid Herrmann list_del(&user->list); 16692c8e1411SDavid Herrmann user->list.next = NULL; 16702c8e1411SDavid Herrmann user->list.prev = NULL; 16712c8e1411SDavid Herrmann user->remove(conn, user); 16722c8e1411SDavid Herrmann } 16732c8e1411SDavid Herrmann } 16742c8e1411SDavid Herrmann 16755d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 16765d3de7dfSVinicius Costa Gomes { 16775d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 16785d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 16795d3de7dfSVinicius Costa Gomes 16805d3de7dfSVinicius Costa Gomes if (!conn) 16815d3de7dfSVinicius Costa Gomes return; 16825d3de7dfSVinicius Costa Gomes 16835d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 16845d3de7dfSVinicius Costa Gomes 16855d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 16865d3de7dfSVinicius Costa Gomes 168761a939c6SJohan Hedberg skb_queue_purge(&conn->pending_rx); 16887ab56c3aSJukka Taimisto 16897ab56c3aSJukka Taimisto /* We can not call flush_work(&conn->pending_rx_work) here since we 16907ab56c3aSJukka Taimisto * might block if we are running on a worker from the same workqueue 16917ab56c3aSJukka Taimisto * pending_rx_work is waiting on. 16927ab56c3aSJukka Taimisto */ 16937ab56c3aSJukka Taimisto if (work_pending(&conn->pending_rx_work)) 16947ab56c3aSJukka Taimisto cancel_work_sync(&conn->pending_rx_work); 169561a939c6SJohan Hedberg 16962c8e1411SDavid Herrmann l2cap_unregister_all_users(conn); 16972c8e1411SDavid Herrmann 16983df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 16993df91ea2SAndrei Emeltchenko 17005d3de7dfSVinicius Costa Gomes /* Kill channels */ 17015d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 170261d6ef3eSMat Martineau l2cap_chan_hold(chan); 17036be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 17046be36555SAndrei Emeltchenko 17055d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 17066be36555SAndrei Emeltchenko 17076be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 17086be36555SAndrei Emeltchenko 170980b98027SGustavo Padovan chan->ops->close(chan); 171061d6ef3eSMat Martineau l2cap_chan_put(chan); 17115d3de7dfSVinicius Costa Gomes } 17125d3de7dfSVinicius Costa Gomes 17133df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 17143df91ea2SAndrei Emeltchenko 171573d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 171673d80debSLuiz Augusto von Dentz 17175d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1718127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 17195d3de7dfSVinicius Costa Gomes 172051a8efd7SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { 1721127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->security_timer); 17228aab4757SVinicius Costa Gomes smp_chan_destroy(conn); 1723d26a2345SVinicius Costa Gomes } 17245d3de7dfSVinicius Costa Gomes 17255d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 17269c903e37SDavid Herrmann conn->hchan = NULL; 17279c903e37SDavid Herrmann l2cap_conn_put(conn); 17285d3de7dfSVinicius Costa Gomes } 17295d3de7dfSVinicius Costa Gomes 17306c9d42a1SGustavo F. Padovan static void security_timeout(struct work_struct *work) 17315d3de7dfSVinicius Costa Gomes { 17326c9d42a1SGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 17336c9d42a1SGustavo F. Padovan security_timer.work); 17345d3de7dfSVinicius Costa Gomes 1735d06cc416SJohan Hedberg BT_DBG("conn %p", conn); 1736d06cc416SJohan Hedberg 1737d06cc416SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { 1738d06cc416SJohan Hedberg smp_chan_destroy(conn); 17395d3de7dfSVinicius Costa Gomes l2cap_conn_del(conn->hcon, ETIMEDOUT); 17405d3de7dfSVinicius Costa Gomes } 1741d06cc416SJohan Hedberg } 17425d3de7dfSVinicius Costa Gomes 17439c903e37SDavid Herrmann static void l2cap_conn_free(struct kref *ref) 17449c903e37SDavid Herrmann { 17459c903e37SDavid Herrmann struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); 17469c903e37SDavid Herrmann 17479c903e37SDavid Herrmann hci_conn_put(conn->hcon); 17489c903e37SDavid Herrmann kfree(conn); 17499c903e37SDavid Herrmann } 17509c903e37SDavid Herrmann 17519c903e37SDavid Herrmann void l2cap_conn_get(struct l2cap_conn *conn) 17529c903e37SDavid Herrmann { 17539c903e37SDavid Herrmann kref_get(&conn->ref); 17549c903e37SDavid Herrmann } 17559c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_get); 17569c903e37SDavid Herrmann 17579c903e37SDavid Herrmann void l2cap_conn_put(struct l2cap_conn *conn) 17589c903e37SDavid Herrmann { 17599c903e37SDavid Herrmann kref_put(&conn->ref, l2cap_conn_free); 17609c903e37SDavid Herrmann } 17619c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_put); 17629c903e37SDavid Herrmann 17630a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 17640a708f8fSGustavo F. Padovan 1765c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 17660a708f8fSGustavo F. Padovan * Returns closest match. 17670a708f8fSGustavo F. Padovan */ 1768c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1769c2287681SIdo Yariv bdaddr_t *src, 1770bf20fd4eSJohan Hedberg bdaddr_t *dst, 1771bf20fd4eSJohan Hedberg u8 link_type) 17720a708f8fSGustavo F. Padovan { 177323691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 17740a708f8fSGustavo F. Padovan 177523691d75SGustavo F. Padovan read_lock(&chan_list_lock); 17760a708f8fSGustavo F. Padovan 177723691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 177889bc500eSGustavo F. Padovan if (state && c->state != state) 17790a708f8fSGustavo F. Padovan continue; 17800a708f8fSGustavo F. Padovan 1781bf20fd4eSJohan Hedberg if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) 1782bf20fd4eSJohan Hedberg continue; 1783bf20fd4eSJohan Hedberg 1784bf20fd4eSJohan Hedberg if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) 1785bf20fd4eSJohan Hedberg continue; 1786bf20fd4eSJohan Hedberg 178723691d75SGustavo F. Padovan if (c->psm == psm) { 1788c2287681SIdo Yariv int src_match, dst_match; 1789c2287681SIdo Yariv int src_any, dst_any; 1790c2287681SIdo Yariv 17910a708f8fSGustavo F. Padovan /* Exact match. */ 17927eafc59eSMarcel Holtmann src_match = !bacmp(&c->src, src); 17937eafc59eSMarcel Holtmann dst_match = !bacmp(&c->dst, dst); 1794c2287681SIdo Yariv if (src_match && dst_match) { 1795a7567b20SJohannes Berg read_unlock(&chan_list_lock); 179623691d75SGustavo F. Padovan return c; 179723691d75SGustavo F. Padovan } 17980a708f8fSGustavo F. Padovan 17990a708f8fSGustavo F. Padovan /* Closest match */ 18007eafc59eSMarcel Holtmann src_any = !bacmp(&c->src, BDADDR_ANY); 18017eafc59eSMarcel Holtmann dst_any = !bacmp(&c->dst, BDADDR_ANY); 1802c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1803c2287681SIdo Yariv (src_any && dst_any)) 180423691d75SGustavo F. Padovan c1 = c; 18050a708f8fSGustavo F. Padovan } 18060a708f8fSGustavo F. Padovan } 18070a708f8fSGustavo F. Padovan 180823691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 18090a708f8fSGustavo F. Padovan 181023691d75SGustavo F. Padovan return c1; 18110a708f8fSGustavo F. Padovan } 18120a708f8fSGustavo F. Padovan 1813721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 18140a708f8fSGustavo F. Padovan { 1815721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1816721c4181SGustavo F. Padovan monitor_timer.work); 18170a708f8fSGustavo F. Padovan 1818525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 18190a708f8fSGustavo F. Padovan 18206be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 18216be36555SAndrei Emeltchenko 182280909e04SMat Martineau if (!chan->conn) { 18236be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18248d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18250a708f8fSGustavo F. Padovan return; 18260a708f8fSGustavo F. Padovan } 18270a708f8fSGustavo F. Padovan 1828401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 18290a708f8fSGustavo F. Padovan 18306be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18318d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18320a708f8fSGustavo F. Padovan } 18330a708f8fSGustavo F. Padovan 1834721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 18350a708f8fSGustavo F. Padovan { 1836721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1837721c4181SGustavo F. Padovan retrans_timer.work); 18380a708f8fSGustavo F. Padovan 183949208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 18400a708f8fSGustavo F. Padovan 18416be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 18426be36555SAndrei Emeltchenko 184380909e04SMat Martineau if (!chan->conn) { 184480909e04SMat Martineau l2cap_chan_unlock(chan); 184580909e04SMat Martineau l2cap_chan_put(chan); 184680909e04SMat Martineau return; 184780909e04SMat Martineau } 18480a708f8fSGustavo F. Padovan 1849401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 18506be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 18518d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 18520a708f8fSGustavo F. Padovan } 18530a708f8fSGustavo F. Padovan 1854d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 18553733937dSMat Martineau struct sk_buff_head *skbs) 18560a708f8fSGustavo F. Padovan { 18570a708f8fSGustavo F. Padovan struct sk_buff *skb; 18583733937dSMat Martineau struct l2cap_ctrl *control; 18590a708f8fSGustavo F. Padovan 18603733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 18613733937dSMat Martineau 1862b99e13adSMat Martineau if (__chan_is_moving(chan)) 1863b99e13adSMat Martineau return; 1864b99e13adSMat Martineau 18653733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 18663733937dSMat Martineau 18673733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 18683733937dSMat Martineau 18693733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 18703733937dSMat Martineau 18713733937dSMat Martineau bt_cb(skb)->control.retries = 1; 18723733937dSMat Martineau control = &bt_cb(skb)->control; 18733733937dSMat Martineau 18743733937dSMat Martineau control->reqseq = 0; 18753733937dSMat Martineau control->txseq = chan->next_tx_seq; 18763733937dSMat Martineau 18773733937dSMat Martineau __pack_control(chan, control, skb); 18780a708f8fSGustavo F. Padovan 187947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 18803733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 18813733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 18820a708f8fSGustavo F. Padovan } 18830a708f8fSGustavo F. Padovan 18844343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 18850a708f8fSGustavo F. Padovan 1886b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 18873733937dSMat Martineau 1888836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 18893733937dSMat Martineau chan->frames_sent++; 18900a708f8fSGustavo F. Padovan } 18910a708f8fSGustavo F. Padovan } 18920a708f8fSGustavo F. Padovan 189367c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 18940a708f8fSGustavo F. Padovan { 18950a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 189618a48e76SMat Martineau struct l2cap_ctrl *control; 189718a48e76SMat Martineau int sent = 0; 189818a48e76SMat Martineau 189918a48e76SMat Martineau BT_DBG("chan %p", chan); 19000a708f8fSGustavo F. Padovan 190189bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 19020a708f8fSGustavo F. Padovan return -ENOTCONN; 19030a708f8fSGustavo F. Padovan 190494122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 190594122bbeSMat Martineau return 0; 190694122bbeSMat Martineau 1907b99e13adSMat Martineau if (__chan_is_moving(chan)) 1908b99e13adSMat Martineau return 0; 1909b99e13adSMat Martineau 191018a48e76SMat Martineau while (chan->tx_send_head && 191118a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 191218a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 19130a708f8fSGustavo F. Padovan 191418a48e76SMat Martineau skb = chan->tx_send_head; 19150a708f8fSGustavo F. Padovan 191618a48e76SMat Martineau bt_cb(skb)->control.retries = 1; 191718a48e76SMat Martineau control = &bt_cb(skb)->control; 19180a708f8fSGustavo F. Padovan 1919e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 192018a48e76SMat Martineau control->final = 1; 1921e2ab4353SGustavo F. Padovan 192218a48e76SMat Martineau control->reqseq = chan->buffer_seq; 192318a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 192418a48e76SMat Martineau control->txseq = chan->next_tx_seq; 19250a708f8fSGustavo F. Padovan 192618a48e76SMat Martineau __pack_control(chan, control, skb); 19270a708f8fSGustavo F. Padovan 192847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 192918a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 193018a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 19310a708f8fSGustavo F. Padovan } 19320a708f8fSGustavo F. Padovan 193318a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 193418a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 193518a48e76SMat Martineau */ 193618a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 193718a48e76SMat Martineau 193818a48e76SMat Martineau if (!tx_skb) 193918a48e76SMat Martineau break; 19400a708f8fSGustavo F. Padovan 19411a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 19420a708f8fSGustavo F. Padovan 1943836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 19446a026610SGustavo F. Padovan chan->unacked_frames++; 19456a026610SGustavo F. Padovan chan->frames_sent++; 194618a48e76SMat Martineau sent++; 19470a708f8fSGustavo F. Padovan 194858d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 194958d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 19500a708f8fSGustavo F. Padovan else 195158d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 195218a48e76SMat Martineau 195318a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 1954b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 19550a708f8fSGustavo F. Padovan } 19560a708f8fSGustavo F. Padovan 1957b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 1958b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 195918a48e76SMat Martineau 196018a48e76SMat Martineau return sent; 19610a708f8fSGustavo F. Padovan } 19620a708f8fSGustavo F. Padovan 1963e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 1964e1fbd4c1SMat Martineau { 1965e1fbd4c1SMat Martineau struct l2cap_ctrl control; 1966e1fbd4c1SMat Martineau struct sk_buff *skb; 1967e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 1968e1fbd4c1SMat Martineau u16 seq; 1969e1fbd4c1SMat Martineau 1970e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 1971e1fbd4c1SMat Martineau 1972e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 1973e1fbd4c1SMat Martineau return; 1974e1fbd4c1SMat Martineau 1975b99e13adSMat Martineau if (__chan_is_moving(chan)) 1976b99e13adSMat Martineau return; 1977b99e13adSMat Martineau 1978e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 1979e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 1980e1fbd4c1SMat Martineau 1981e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 1982e1fbd4c1SMat Martineau if (!skb) { 1983e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 1984e1fbd4c1SMat Martineau seq); 1985e1fbd4c1SMat Martineau continue; 1986e1fbd4c1SMat Martineau } 1987e1fbd4c1SMat Martineau 1988e1fbd4c1SMat Martineau bt_cb(skb)->control.retries++; 1989e1fbd4c1SMat Martineau control = bt_cb(skb)->control; 1990e1fbd4c1SMat Martineau 1991e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 1992e1fbd4c1SMat Martineau bt_cb(skb)->control.retries > chan->max_tx) { 1993e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 19945e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 1995e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 1996e1fbd4c1SMat Martineau break; 1997e1fbd4c1SMat Martineau } 1998e1fbd4c1SMat Martineau 1999e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 2000e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 2001e1fbd4c1SMat Martineau control.final = 1; 2002e1fbd4c1SMat Martineau else 2003e1fbd4c1SMat Martineau control.final = 0; 2004e1fbd4c1SMat Martineau 2005e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 2006e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 2007e1fbd4c1SMat Martineau * writeable copy 2008e1fbd4c1SMat Martineau */ 20098bcde1f2SGustavo Padovan tx_skb = skb_copy(skb, GFP_KERNEL); 2010e1fbd4c1SMat Martineau } else { 20118bcde1f2SGustavo Padovan tx_skb = skb_clone(skb, GFP_KERNEL); 2012e1fbd4c1SMat Martineau } 2013e1fbd4c1SMat Martineau 2014e1fbd4c1SMat Martineau if (!tx_skb) { 2015e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2016e1fbd4c1SMat Martineau break; 2017e1fbd4c1SMat Martineau } 2018e1fbd4c1SMat Martineau 2019e1fbd4c1SMat Martineau /* Update skb contents */ 2020e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 2021e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 2022e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2023e1fbd4c1SMat Martineau } else { 2024e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 2025e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2026e1fbd4c1SMat Martineau } 2027e1fbd4c1SMat Martineau 2028e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 2029e1fbd4c1SMat Martineau u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); 2030e1fbd4c1SMat Martineau put_unaligned_le16(fcs, skb_put(tx_skb, 2031e1fbd4c1SMat Martineau L2CAP_FCS_SIZE)); 2032e1fbd4c1SMat Martineau } 2033e1fbd4c1SMat Martineau 2034e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 2035e1fbd4c1SMat Martineau 2036e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 2037e1fbd4c1SMat Martineau 2038e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 2039e1fbd4c1SMat Martineau } 2040e1fbd4c1SMat Martineau } 2041e1fbd4c1SMat Martineau 2042f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 2043f80842a8SMat Martineau struct l2cap_ctrl *control) 2044f80842a8SMat Martineau { 2045f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2046f80842a8SMat Martineau 2047f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 2048f80842a8SMat Martineau l2cap_ertm_resend(chan); 2049f80842a8SMat Martineau } 2050f80842a8SMat Martineau 2051d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 2052d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 2053d2a7ac5dSMat Martineau { 2054e1fbd4c1SMat Martineau struct sk_buff *skb; 2055e1fbd4c1SMat Martineau 2056e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2057e1fbd4c1SMat Martineau 2058e1fbd4c1SMat Martineau if (control->poll) 2059e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 2060e1fbd4c1SMat Martineau 2061e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2062e1fbd4c1SMat Martineau 2063e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 2064e1fbd4c1SMat Martineau return; 2065e1fbd4c1SMat Martineau 2066e1fbd4c1SMat Martineau if (chan->unacked_frames) { 2067e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 2068e1fbd4c1SMat Martineau if (bt_cb(skb)->control.txseq == control->reqseq || 2069e1fbd4c1SMat Martineau skb == chan->tx_send_head) 2070e1fbd4c1SMat Martineau break; 2071e1fbd4c1SMat Martineau } 2072e1fbd4c1SMat Martineau 2073e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 2074e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 2075e1fbd4c1SMat Martineau break; 2076e1fbd4c1SMat Martineau 2077e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 2078e1fbd4c1SMat Martineau bt_cb(skb)->control.txseq); 2079e1fbd4c1SMat Martineau } 2080e1fbd4c1SMat Martineau 2081e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 2082e1fbd4c1SMat Martineau } 2083d2a7ac5dSMat Martineau } 2084d2a7ac5dSMat Martineau 2085b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 2086b17e73bbSSzymon Janc { 20870a0aba42SMat Martineau struct l2cap_ctrl control; 20880a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 20890a0aba42SMat Martineau chan->last_acked_seq); 20900a0aba42SMat Martineau int threshold; 20910a0aba42SMat Martineau 20920a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 20930a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 20940a0aba42SMat Martineau 20950a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 20960a0aba42SMat Martineau control.sframe = 1; 20970a0aba42SMat Martineau 20980a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 20990a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 2100b17e73bbSSzymon Janc __clear_ack_timer(chan); 21010a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 21020a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 21030a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 21040a0aba42SMat Martineau } else { 21050a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 21060a0aba42SMat Martineau l2cap_ertm_send(chan); 21070a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 21080a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 21090a0aba42SMat Martineau frames_to_ack = 0; 21100a0aba42SMat Martineau } 21110a0aba42SMat Martineau 2112c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 21130a0aba42SMat Martineau * Calculate without mul or div 21140a0aba42SMat Martineau */ 2115c20f8e35SMat Martineau threshold = chan->ack_win; 21160a0aba42SMat Martineau threshold += threshold << 1; 21170a0aba42SMat Martineau threshold >>= 2; 21180a0aba42SMat Martineau 2119b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 21200a0aba42SMat Martineau threshold); 21210a0aba42SMat Martineau 21220a0aba42SMat Martineau if (frames_to_ack >= threshold) { 21230a0aba42SMat Martineau __clear_ack_timer(chan); 21240a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 21250a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 21260a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 21270a0aba42SMat Martineau frames_to_ack = 0; 21280a0aba42SMat Martineau } 21290a0aba42SMat Martineau 21300a0aba42SMat Martineau if (frames_to_ack) 21310a0aba42SMat Martineau __set_ack_timer(chan); 21320a0aba42SMat Martineau } 2133b17e73bbSSzymon Janc } 2134b17e73bbSSzymon Janc 213504124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 213604124681SGustavo F. Padovan struct msghdr *msg, int len, 213704124681SGustavo F. Padovan int count, struct sk_buff *skb) 21380a708f8fSGustavo F. Padovan { 21390952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 21400a708f8fSGustavo F. Padovan struct sk_buff **frag; 214190338947SGustavo Padovan int sent = 0; 21420a708f8fSGustavo F. Padovan 21430498878bSJukka Rissanen if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count), 21440498878bSJukka Rissanen msg->msg_iov, count)) 21450a708f8fSGustavo F. Padovan return -EFAULT; 21460a708f8fSGustavo F. Padovan 21470a708f8fSGustavo F. Padovan sent += count; 21480a708f8fSGustavo F. Padovan len -= count; 21490a708f8fSGustavo F. Padovan 21500a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 21510a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 21520a708f8fSGustavo F. Padovan while (len) { 2153fbe00700SGustavo Padovan struct sk_buff *tmp; 2154fbe00700SGustavo Padovan 21550a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 21560a708f8fSGustavo F. Padovan 2157d9fbd02bSMarcel Holtmann tmp = chan->ops->alloc_skb(chan, 0, count, 215890338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 2159fbe00700SGustavo Padovan if (IS_ERR(tmp)) 2160fbe00700SGustavo Padovan return PTR_ERR(tmp); 21612f7719ceSAndrei Emeltchenko 2162fbe00700SGustavo Padovan *frag = tmp; 2163fbe00700SGustavo Padovan 21640498878bSJukka Rissanen if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count), 21650498878bSJukka Rissanen msg->msg_iov, count)) 21660a708f8fSGustavo F. Padovan return -EFAULT; 21670a708f8fSGustavo F. Padovan 21680a708f8fSGustavo F. Padovan sent += count; 21690a708f8fSGustavo F. Padovan len -= count; 21700a708f8fSGustavo F. Padovan 21712d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 21722d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 21732d0ed3d5SGustavo Padovan 21740a708f8fSGustavo F. Padovan frag = &(*frag)->next; 21750a708f8fSGustavo F. Padovan } 21760a708f8fSGustavo F. Padovan 21770a708f8fSGustavo F. Padovan return sent; 21780a708f8fSGustavo F. Padovan } 21790a708f8fSGustavo F. Padovan 21805e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 21818d46321cSMarcel Holtmann struct msghdr *msg, size_t len) 21820a708f8fSGustavo F. Padovan { 21838c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 21840a708f8fSGustavo F. Padovan struct sk_buff *skb; 218503a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 21860a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 21870a708f8fSGustavo F. Padovan 21888d46321cSMarcel Holtmann BT_DBG("chan %p psm 0x%2.2x len %zu", chan, 21898d46321cSMarcel Holtmann __le16_to_cpu(chan->psm), len); 21900a708f8fSGustavo F. Padovan 21910a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 21922f7719ceSAndrei Emeltchenko 2193d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 219490338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 219590338947SGustavo Padovan if (IS_ERR(skb)) 219690338947SGustavo Padovan return skb; 21970a708f8fSGustavo F. Padovan 21980a708f8fSGustavo F. Padovan /* Create L2CAP header */ 21990a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2200fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 2201daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 220243b1b8dfSMarcel Holtmann put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); 22030a708f8fSGustavo F. Padovan 22040952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22050a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22060a708f8fSGustavo F. Padovan kfree_skb(skb); 22070a708f8fSGustavo F. Padovan return ERR_PTR(err); 22080a708f8fSGustavo F. Padovan } 22090a708f8fSGustavo F. Padovan return skb; 22100a708f8fSGustavo F. Padovan } 22110a708f8fSGustavo F. Padovan 22125e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 22138d46321cSMarcel Holtmann struct msghdr *msg, size_t len) 22140a708f8fSGustavo F. Padovan { 22158c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22160a708f8fSGustavo F. Padovan struct sk_buff *skb; 2217f2ba7faeSGustavo Padovan int err, count; 22180a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22190a708f8fSGustavo F. Padovan 2220b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 22210a708f8fSGustavo F. Padovan 2222f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 22232f7719ceSAndrei Emeltchenko 2224d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, 222590338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 222690338947SGustavo Padovan if (IS_ERR(skb)) 222790338947SGustavo Padovan return skb; 22280a708f8fSGustavo F. Padovan 22290a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22300a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2231fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22326ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 22330a708f8fSGustavo F. Padovan 22340952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22350a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22360a708f8fSGustavo F. Padovan kfree_skb(skb); 22370a708f8fSGustavo F. Padovan return ERR_PTR(err); 22380a708f8fSGustavo F. Padovan } 22390a708f8fSGustavo F. Padovan return skb; 22400a708f8fSGustavo F. Padovan } 22410a708f8fSGustavo F. Padovan 2242ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2243ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 224494122bbeSMat Martineau u16 sdulen) 22450a708f8fSGustavo F. Padovan { 22468c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22470a708f8fSGustavo F. Padovan struct sk_buff *skb; 2248e4ca6d98SAndrei Emeltchenko int err, count, hlen; 22490a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22500a708f8fSGustavo F. Padovan 2251b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 22520a708f8fSGustavo F. Padovan 22530a708f8fSGustavo F. Padovan if (!conn) 22540a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 22550a708f8fSGustavo F. Padovan 2256ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2257e4ca6d98SAndrei Emeltchenko 22580a708f8fSGustavo F. Padovan if (sdulen) 225903a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 22600a708f8fSGustavo F. Padovan 226147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 226203a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 22630a708f8fSGustavo F. Padovan 22640a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 22652f7719ceSAndrei Emeltchenko 2266d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 226790338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 226890338947SGustavo Padovan if (IS_ERR(skb)) 226990338947SGustavo Padovan return skb; 22700a708f8fSGustavo F. Padovan 22710a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22720a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2273fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 22740a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 227588843ab0SAndrei Emeltchenko 227618a48e76SMat Martineau /* Control header is populated later */ 227718a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 227818a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 227918a48e76SMat Martineau else 228018a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 228188843ab0SAndrei Emeltchenko 22820a708f8fSGustavo F. Padovan if (sdulen) 228303a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 22840a708f8fSGustavo F. Padovan 22850952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22860a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22870a708f8fSGustavo F. Padovan kfree_skb(skb); 22880a708f8fSGustavo F. Padovan return ERR_PTR(err); 22890a708f8fSGustavo F. Padovan } 22900a708f8fSGustavo F. Padovan 229118a48e76SMat Martineau bt_cb(skb)->control.fcs = chan->fcs; 22923ce3514fSMat Martineau bt_cb(skb)->control.retries = 0; 22930a708f8fSGustavo F. Padovan return skb; 22940a708f8fSGustavo F. Padovan } 22950a708f8fSGustavo F. Padovan 229694122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 229794122bbeSMat Martineau struct sk_buff_head *seg_queue, 229894122bbeSMat Martineau struct msghdr *msg, size_t len) 22990a708f8fSGustavo F. Padovan { 23000a708f8fSGustavo F. Padovan struct sk_buff *skb; 230194122bbeSMat Martineau u16 sdu_len; 230294122bbeSMat Martineau size_t pdu_len; 230394122bbeSMat Martineau u8 sar; 23040a708f8fSGustavo F. Padovan 2305b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 23060a708f8fSGustavo F. Padovan 230794122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 230894122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 230994122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 231094122bbeSMat Martineau */ 231194122bbeSMat Martineau 231294122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 231394122bbeSMat Martineau pdu_len = chan->conn->mtu; 231494122bbeSMat Martineau 2315a549574dSMat Martineau /* Constrain PDU size for BR/EDR connections */ 2316a549574dSMat Martineau if (!chan->hs_hcon) 231794122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 231894122bbeSMat Martineau 231994122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 232035d401dfSGustavo Padovan if (chan->fcs) 232135d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 232235d401dfSGustavo Padovan 2323ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 232494122bbeSMat Martineau 232594122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 232694122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 232794122bbeSMat Martineau 232894122bbeSMat Martineau if (len <= pdu_len) { 232994122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 233094122bbeSMat Martineau sdu_len = 0; 233194122bbeSMat Martineau pdu_len = len; 233294122bbeSMat Martineau } else { 233394122bbeSMat Martineau sar = L2CAP_SAR_START; 233494122bbeSMat Martineau sdu_len = len; 233594122bbeSMat Martineau pdu_len -= L2CAP_SDULEN_SIZE; 233694122bbeSMat Martineau } 23370a708f8fSGustavo F. Padovan 23380a708f8fSGustavo F. Padovan while (len > 0) { 233994122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 23400a708f8fSGustavo F. Padovan 23410a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 234294122bbeSMat Martineau __skb_queue_purge(seg_queue); 23430a708f8fSGustavo F. Padovan return PTR_ERR(skb); 23440a708f8fSGustavo F. Padovan } 23450a708f8fSGustavo F. Padovan 234694122bbeSMat Martineau bt_cb(skb)->control.sar = sar; 234794122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 23480a708f8fSGustavo F. Padovan 234994122bbeSMat Martineau len -= pdu_len; 235094122bbeSMat Martineau if (sdu_len) { 235194122bbeSMat Martineau sdu_len = 0; 235294122bbeSMat Martineau pdu_len += L2CAP_SDULEN_SIZE; 235394122bbeSMat Martineau } 235494122bbeSMat Martineau 235594122bbeSMat Martineau if (len <= pdu_len) { 235694122bbeSMat Martineau sar = L2CAP_SAR_END; 235794122bbeSMat Martineau pdu_len = len; 235894122bbeSMat Martineau } else { 235994122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 236094122bbeSMat Martineau } 236194122bbeSMat Martineau } 236294122bbeSMat Martineau 2363f0f62799SGustavo Padovan return 0; 23640a708f8fSGustavo F. Padovan } 23650a708f8fSGustavo F. Padovan 2366177f8f2bSJohan Hedberg static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, 2367177f8f2bSJohan Hedberg struct msghdr *msg, 2368177f8f2bSJohan Hedberg size_t len, u16 sdulen) 2369177f8f2bSJohan Hedberg { 2370177f8f2bSJohan Hedberg struct l2cap_conn *conn = chan->conn; 2371177f8f2bSJohan Hedberg struct sk_buff *skb; 2372177f8f2bSJohan Hedberg int err, count, hlen; 2373177f8f2bSJohan Hedberg struct l2cap_hdr *lh; 2374177f8f2bSJohan Hedberg 2375177f8f2bSJohan Hedberg BT_DBG("chan %p len %zu", chan, len); 2376177f8f2bSJohan Hedberg 2377177f8f2bSJohan Hedberg if (!conn) 2378177f8f2bSJohan Hedberg return ERR_PTR(-ENOTCONN); 2379177f8f2bSJohan Hedberg 2380177f8f2bSJohan Hedberg hlen = L2CAP_HDR_SIZE; 2381177f8f2bSJohan Hedberg 2382177f8f2bSJohan Hedberg if (sdulen) 2383177f8f2bSJohan Hedberg hlen += L2CAP_SDULEN_SIZE; 2384177f8f2bSJohan Hedberg 2385177f8f2bSJohan Hedberg count = min_t(unsigned int, (conn->mtu - hlen), len); 2386177f8f2bSJohan Hedberg 2387d9fbd02bSMarcel Holtmann skb = chan->ops->alloc_skb(chan, hlen, count, 2388177f8f2bSJohan Hedberg msg->msg_flags & MSG_DONTWAIT); 2389177f8f2bSJohan Hedberg if (IS_ERR(skb)) 2390177f8f2bSJohan Hedberg return skb; 2391177f8f2bSJohan Hedberg 2392177f8f2bSJohan Hedberg /* Create L2CAP header */ 2393177f8f2bSJohan Hedberg lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2394177f8f2bSJohan Hedberg lh->cid = cpu_to_le16(chan->dcid); 2395177f8f2bSJohan Hedberg lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 2396177f8f2bSJohan Hedberg 2397177f8f2bSJohan Hedberg if (sdulen) 2398177f8f2bSJohan Hedberg put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 2399177f8f2bSJohan Hedberg 2400177f8f2bSJohan Hedberg err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 2401177f8f2bSJohan Hedberg if (unlikely(err < 0)) { 2402177f8f2bSJohan Hedberg kfree_skb(skb); 2403177f8f2bSJohan Hedberg return ERR_PTR(err); 2404177f8f2bSJohan Hedberg } 2405177f8f2bSJohan Hedberg 2406177f8f2bSJohan Hedberg return skb; 2407177f8f2bSJohan Hedberg } 2408177f8f2bSJohan Hedberg 2409177f8f2bSJohan Hedberg static int l2cap_segment_le_sdu(struct l2cap_chan *chan, 2410177f8f2bSJohan Hedberg struct sk_buff_head *seg_queue, 2411177f8f2bSJohan Hedberg struct msghdr *msg, size_t len) 2412177f8f2bSJohan Hedberg { 2413177f8f2bSJohan Hedberg struct sk_buff *skb; 2414177f8f2bSJohan Hedberg size_t pdu_len; 2415177f8f2bSJohan Hedberg u16 sdu_len; 2416177f8f2bSJohan Hedberg 2417177f8f2bSJohan Hedberg BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 2418177f8f2bSJohan Hedberg 2419177f8f2bSJohan Hedberg pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE; 2420177f8f2bSJohan Hedberg 2421177f8f2bSJohan Hedberg pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 2422177f8f2bSJohan Hedberg 2423177f8f2bSJohan Hedberg sdu_len = len; 2424177f8f2bSJohan Hedberg pdu_len -= L2CAP_SDULEN_SIZE; 2425177f8f2bSJohan Hedberg 2426177f8f2bSJohan Hedberg while (len > 0) { 2427177f8f2bSJohan Hedberg if (len <= pdu_len) 2428177f8f2bSJohan Hedberg pdu_len = len; 2429177f8f2bSJohan Hedberg 2430177f8f2bSJohan Hedberg skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); 2431177f8f2bSJohan Hedberg if (IS_ERR(skb)) { 2432177f8f2bSJohan Hedberg __skb_queue_purge(seg_queue); 2433177f8f2bSJohan Hedberg return PTR_ERR(skb); 2434177f8f2bSJohan Hedberg } 2435177f8f2bSJohan Hedberg 2436177f8f2bSJohan Hedberg __skb_queue_tail(seg_queue, skb); 2437177f8f2bSJohan Hedberg 2438177f8f2bSJohan Hedberg len -= pdu_len; 2439177f8f2bSJohan Hedberg 2440177f8f2bSJohan Hedberg if (sdu_len) { 2441177f8f2bSJohan Hedberg sdu_len = 0; 2442177f8f2bSJohan Hedberg pdu_len += L2CAP_SDULEN_SIZE; 2443177f8f2bSJohan Hedberg } 2444177f8f2bSJohan Hedberg } 2445177f8f2bSJohan Hedberg 2446177f8f2bSJohan Hedberg return 0; 2447177f8f2bSJohan Hedberg } 2448177f8f2bSJohan Hedberg 24498d46321cSMarcel Holtmann int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) 24509a91a04aSGustavo F. Padovan { 24519a91a04aSGustavo F. Padovan struct sk_buff *skb; 24529a91a04aSGustavo F. Padovan int err; 245394122bbeSMat Martineau struct sk_buff_head seg_queue; 24549a91a04aSGustavo F. Padovan 245531e8ce80SSeung-Woo Kim if (!chan->conn) 245631e8ce80SSeung-Woo Kim return -ENOTCONN; 245731e8ce80SSeung-Woo Kim 24589a91a04aSGustavo F. Padovan /* Connectionless channel */ 2459715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 24608d46321cSMarcel Holtmann skb = l2cap_create_connless_pdu(chan, msg, len); 24619a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 24629a91a04aSGustavo F. Padovan return PTR_ERR(skb); 24639a91a04aSGustavo F. Padovan 2464ede81a2aSAndrzej Kaczmarek /* Channel lock is released before requesting new skb and then 2465ede81a2aSAndrzej Kaczmarek * reacquired thus we need to recheck channel state. 2466ede81a2aSAndrzej Kaczmarek */ 2467ede81a2aSAndrzej Kaczmarek if (chan->state != BT_CONNECTED) { 2468ede81a2aSAndrzej Kaczmarek kfree_skb(skb); 2469ede81a2aSAndrzej Kaczmarek return -ENOTCONN; 2470ede81a2aSAndrzej Kaczmarek } 2471ede81a2aSAndrzej Kaczmarek 24729a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 24739a91a04aSGustavo F. Padovan return len; 24749a91a04aSGustavo F. Padovan } 24759a91a04aSGustavo F. Padovan 24769a91a04aSGustavo F. Padovan switch (chan->mode) { 247738319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 2478177f8f2bSJohan Hedberg /* Check outgoing MTU */ 2479177f8f2bSJohan Hedberg if (len > chan->omtu) 2480177f8f2bSJohan Hedberg return -EMSGSIZE; 2481177f8f2bSJohan Hedberg 2482fad5fc89SJohan Hedberg if (!chan->tx_credits) 2483fad5fc89SJohan Hedberg return -EAGAIN; 2484fad5fc89SJohan Hedberg 2485177f8f2bSJohan Hedberg __skb_queue_head_init(&seg_queue); 2486177f8f2bSJohan Hedberg 2487177f8f2bSJohan Hedberg err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); 2488177f8f2bSJohan Hedberg 2489177f8f2bSJohan Hedberg if (chan->state != BT_CONNECTED) { 2490177f8f2bSJohan Hedberg __skb_queue_purge(&seg_queue); 2491177f8f2bSJohan Hedberg err = -ENOTCONN; 2492177f8f2bSJohan Hedberg } 2493177f8f2bSJohan Hedberg 2494177f8f2bSJohan Hedberg if (err) 2495177f8f2bSJohan Hedberg return err; 2496177f8f2bSJohan Hedberg 2497177f8f2bSJohan Hedberg skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); 2498177f8f2bSJohan Hedberg 2499177f8f2bSJohan Hedberg while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { 2500177f8f2bSJohan Hedberg l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); 2501177f8f2bSJohan Hedberg chan->tx_credits--; 2502177f8f2bSJohan Hedberg } 2503177f8f2bSJohan Hedberg 2504177f8f2bSJohan Hedberg if (!chan->tx_credits) 2505177f8f2bSJohan Hedberg chan->ops->suspend(chan); 2506177f8f2bSJohan Hedberg 2507177f8f2bSJohan Hedberg err = len; 2508177f8f2bSJohan Hedberg 2509177f8f2bSJohan Hedberg break; 2510177f8f2bSJohan Hedberg 2511fad5fc89SJohan Hedberg case L2CAP_MODE_BASIC: 25129a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 25139a91a04aSGustavo F. Padovan if (len > chan->omtu) 25149a91a04aSGustavo F. Padovan return -EMSGSIZE; 25159a91a04aSGustavo F. Padovan 25169a91a04aSGustavo F. Padovan /* Create a basic PDU */ 25178d46321cSMarcel Holtmann skb = l2cap_create_basic_pdu(chan, msg, len); 25189a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 25199a91a04aSGustavo F. Padovan return PTR_ERR(skb); 25209a91a04aSGustavo F. Padovan 2521ede81a2aSAndrzej Kaczmarek /* Channel lock is released before requesting new skb and then 2522ede81a2aSAndrzej Kaczmarek * reacquired thus we need to recheck channel state. 2523ede81a2aSAndrzej Kaczmarek */ 2524ede81a2aSAndrzej Kaczmarek if (chan->state != BT_CONNECTED) { 2525ede81a2aSAndrzej Kaczmarek kfree_skb(skb); 2526ede81a2aSAndrzej Kaczmarek return -ENOTCONN; 2527ede81a2aSAndrzej Kaczmarek } 2528ede81a2aSAndrzej Kaczmarek 25299a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 25309a91a04aSGustavo F. Padovan err = len; 25319a91a04aSGustavo F. Padovan break; 25329a91a04aSGustavo F. Padovan 25339a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 25349a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 253594122bbeSMat Martineau /* Check outgoing MTU */ 253694122bbeSMat Martineau if (len > chan->omtu) { 253794122bbeSMat Martineau err = -EMSGSIZE; 25389a91a04aSGustavo F. Padovan break; 25399a91a04aSGustavo F. Padovan } 25409a91a04aSGustavo F. Padovan 254194122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 254294122bbeSMat Martineau 254394122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 254494122bbeSMat Martineau * since it's possible to block while waiting for memory 254594122bbeSMat Martineau * allocation. 254694122bbeSMat Martineau */ 254794122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 254894122bbeSMat Martineau 254994122bbeSMat Martineau /* The channel could have been closed while segmenting, 255094122bbeSMat Martineau * check that it is still connected. 255194122bbeSMat Martineau */ 255294122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 255394122bbeSMat Martineau __skb_queue_purge(&seg_queue); 255494122bbeSMat Martineau err = -ENOTCONN; 25559a91a04aSGustavo F. Padovan } 25569a91a04aSGustavo F. Padovan 255794122bbeSMat Martineau if (err) 255894122bbeSMat Martineau break; 255994122bbeSMat Martineau 25603733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2561d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 25623733937dSMat Martineau else 2563d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 256494122bbeSMat Martineau 25659a91a04aSGustavo F. Padovan err = len; 25669a91a04aSGustavo F. Padovan 256794122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 256894122bbeSMat Martineau * seg_queue and need to be purged. 256994122bbeSMat Martineau */ 257094122bbeSMat Martineau __skb_queue_purge(&seg_queue); 25719a91a04aSGustavo F. Padovan break; 25729a91a04aSGustavo F. Padovan 25739a91a04aSGustavo F. Padovan default: 25749a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 25759a91a04aSGustavo F. Padovan err = -EBADFD; 25769a91a04aSGustavo F. Padovan } 25779a91a04aSGustavo F. Padovan 25789a91a04aSGustavo F. Padovan return err; 25799a91a04aSGustavo F. Padovan } 25806b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_send); 25819a91a04aSGustavo F. Padovan 2582d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2583d2a7ac5dSMat Martineau { 2584bed68bdeSMat Martineau struct l2cap_ctrl control; 2585bed68bdeSMat Martineau u16 seq; 2586bed68bdeSMat Martineau 2587b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2588bed68bdeSMat Martineau 2589bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2590bed68bdeSMat Martineau control.sframe = 1; 2591bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2592bed68bdeSMat Martineau 2593bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2594bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2595bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2596bed68bdeSMat Martineau control.reqseq = seq; 2597bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2598bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2599bed68bdeSMat Martineau } 2600bed68bdeSMat Martineau } 2601bed68bdeSMat Martineau 2602bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2603d2a7ac5dSMat Martineau } 2604d2a7ac5dSMat Martineau 2605d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2606d2a7ac5dSMat Martineau { 2607bed68bdeSMat Martineau struct l2cap_ctrl control; 2608bed68bdeSMat Martineau 2609bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2610bed68bdeSMat Martineau 2611bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2612bed68bdeSMat Martineau return; 2613bed68bdeSMat Martineau 2614bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2615bed68bdeSMat Martineau control.sframe = 1; 2616bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2617bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2618bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2619d2a7ac5dSMat Martineau } 2620d2a7ac5dSMat Martineau 2621d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2622d2a7ac5dSMat Martineau { 2623bed68bdeSMat Martineau struct l2cap_ctrl control; 2624bed68bdeSMat Martineau u16 initial_head; 2625bed68bdeSMat Martineau u16 seq; 2626bed68bdeSMat Martineau 2627b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2628bed68bdeSMat Martineau 2629bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2630bed68bdeSMat Martineau control.sframe = 1; 2631bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2632bed68bdeSMat Martineau 2633bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2634bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2635bed68bdeSMat Martineau 2636bed68bdeSMat Martineau do { 2637bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2638bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2639bed68bdeSMat Martineau break; 2640bed68bdeSMat Martineau 2641bed68bdeSMat Martineau control.reqseq = seq; 2642bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2643bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2644bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2645d2a7ac5dSMat Martineau } 2646d2a7ac5dSMat Martineau 2647608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2648608bcc6dSMat Martineau { 2649608bcc6dSMat Martineau struct sk_buff *acked_skb; 2650608bcc6dSMat Martineau u16 ackseq; 2651608bcc6dSMat Martineau 2652b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2653608bcc6dSMat Martineau 2654608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2655608bcc6dSMat Martineau return; 2656608bcc6dSMat Martineau 2657b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2658608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2659608bcc6dSMat Martineau 2660608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2661608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2662608bcc6dSMat Martineau 2663608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2664608bcc6dSMat Martineau if (acked_skb) { 2665608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2666608bcc6dSMat Martineau kfree_skb(acked_skb); 2667608bcc6dSMat Martineau chan->unacked_frames--; 2668608bcc6dSMat Martineau } 2669608bcc6dSMat Martineau } 2670608bcc6dSMat Martineau 2671608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2672608bcc6dSMat Martineau 2673608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2674608bcc6dSMat Martineau __clear_retrans_timer(chan); 2675608bcc6dSMat Martineau 2676b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2677608bcc6dSMat Martineau } 2678608bcc6dSMat Martineau 2679608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2680608bcc6dSMat Martineau { 2681608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2682608bcc6dSMat Martineau 2683608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2684608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2685608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2686608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2687608bcc6dSMat Martineau } 2688608bcc6dSMat Martineau 2689d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2690608bcc6dSMat Martineau struct l2cap_ctrl *control, 2691608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2692608bcc6dSMat Martineau { 2693608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2694608bcc6dSMat Martineau event); 2695608bcc6dSMat Martineau 2696608bcc6dSMat Martineau switch (event) { 2697608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2698608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2699608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2700608bcc6dSMat Martineau 2701608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2702608bcc6dSMat Martineau l2cap_ertm_send(chan); 2703608bcc6dSMat Martineau break; 2704608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2705608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2706608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2707608bcc6dSMat Martineau 2708608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2709608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2710608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2711608bcc6dSMat Martineau */ 2712608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2713608bcc6dSMat Martineau } 2714608bcc6dSMat Martineau 2715608bcc6dSMat Martineau l2cap_send_ack(chan); 2716608bcc6dSMat Martineau 2717608bcc6dSMat Martineau break; 2718608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2719608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2720608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2721608bcc6dSMat Martineau 2722608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2723608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2724608bcc6dSMat Martineau 2725608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2726608bcc6dSMat Martineau local_control.sframe = 1; 2727608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2728608bcc6dSMat Martineau local_control.poll = 1; 2729608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2730a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2731608bcc6dSMat Martineau 2732608bcc6dSMat Martineau chan->retry_count = 1; 2733608bcc6dSMat Martineau __set_monitor_timer(chan); 2734608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2735608bcc6dSMat Martineau } 2736608bcc6dSMat Martineau break; 2737608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2738608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2739608bcc6dSMat Martineau break; 2740608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2741608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2742608bcc6dSMat Martineau chan->retry_count = 1; 2743608bcc6dSMat Martineau __set_monitor_timer(chan); 2744608bcc6dSMat Martineau __clear_ack_timer(chan); 2745608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2746608bcc6dSMat Martineau break; 2747608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2748608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2749608bcc6dSMat Martineau chan->retry_count = 1; 2750608bcc6dSMat Martineau __set_monitor_timer(chan); 2751608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2752608bcc6dSMat Martineau break; 2753608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2754608bcc6dSMat Martineau /* Nothing to process */ 2755608bcc6dSMat Martineau break; 2756608bcc6dSMat Martineau default: 2757608bcc6dSMat Martineau break; 2758608bcc6dSMat Martineau } 2759608bcc6dSMat Martineau } 2760608bcc6dSMat Martineau 2761d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2762608bcc6dSMat Martineau struct l2cap_ctrl *control, 2763608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2764608bcc6dSMat Martineau { 2765608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2766608bcc6dSMat Martineau event); 2767608bcc6dSMat Martineau 2768608bcc6dSMat Martineau switch (event) { 2769608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2770608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2771608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2772608bcc6dSMat Martineau /* Queue data, but don't send. */ 2773608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2774608bcc6dSMat Martineau break; 2775608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2776608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2777608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2778608bcc6dSMat Martineau 2779608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2780608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2781608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2782608bcc6dSMat Martineau */ 2783608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2784608bcc6dSMat Martineau } 2785608bcc6dSMat Martineau 2786608bcc6dSMat Martineau l2cap_send_ack(chan); 2787608bcc6dSMat Martineau 2788608bcc6dSMat Martineau break; 2789608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2790608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2791608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2792608bcc6dSMat Martineau 2793608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2794608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2795608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2796608bcc6dSMat Martineau local_control.sframe = 1; 2797608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2798608bcc6dSMat Martineau local_control.poll = 1; 2799608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2800a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2801608bcc6dSMat Martineau 2802608bcc6dSMat Martineau chan->retry_count = 1; 2803608bcc6dSMat Martineau __set_monitor_timer(chan); 2804608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2805608bcc6dSMat Martineau } 2806608bcc6dSMat Martineau break; 2807608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2808608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2809608bcc6dSMat Martineau 2810608bcc6dSMat Martineau /* Fall through */ 2811608bcc6dSMat Martineau 2812608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2813608bcc6dSMat Martineau if (control && control->final) { 2814608bcc6dSMat Martineau __clear_monitor_timer(chan); 2815608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2816608bcc6dSMat Martineau __set_retrans_timer(chan); 2817608bcc6dSMat Martineau chan->retry_count = 0; 2818608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2819608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2820608bcc6dSMat Martineau } 2821608bcc6dSMat Martineau break; 2822608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2823608bcc6dSMat Martineau /* Ignore */ 2824608bcc6dSMat Martineau break; 2825608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2826608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2827608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2828608bcc6dSMat Martineau __set_monitor_timer(chan); 2829608bcc6dSMat Martineau chan->retry_count++; 2830608bcc6dSMat Martineau } else { 28315e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNABORTED); 2832608bcc6dSMat Martineau } 2833608bcc6dSMat Martineau break; 2834608bcc6dSMat Martineau default: 2835608bcc6dSMat Martineau break; 2836608bcc6dSMat Martineau } 2837608bcc6dSMat Martineau } 2838608bcc6dSMat Martineau 2839d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2840608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2841608bcc6dSMat Martineau { 2842608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2843608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2844608bcc6dSMat Martineau 2845608bcc6dSMat Martineau switch (chan->tx_state) { 2846608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2847d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2848608bcc6dSMat Martineau break; 2849608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2850d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2851608bcc6dSMat Martineau break; 2852608bcc6dSMat Martineau default: 2853608bcc6dSMat Martineau /* Ignore event */ 2854608bcc6dSMat Martineau break; 2855608bcc6dSMat Martineau } 2856608bcc6dSMat Martineau } 2857608bcc6dSMat Martineau 28584b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 28594b51dae9SMat Martineau struct l2cap_ctrl *control) 28604b51dae9SMat Martineau { 28614b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2862401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 28634b51dae9SMat Martineau } 28644b51dae9SMat Martineau 2865f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2866f80842a8SMat Martineau struct l2cap_ctrl *control) 2867f80842a8SMat Martineau { 2868f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2869401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2870f80842a8SMat Martineau } 2871f80842a8SMat Martineau 28720a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 28730a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 28740a708f8fSGustavo F. Padovan { 28750a708f8fSGustavo F. Padovan struct sk_buff *nskb; 287648454079SGustavo F. Padovan struct l2cap_chan *chan; 28770a708f8fSGustavo F. Padovan 28780a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 28790a708f8fSGustavo F. Padovan 28803df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 28813d57dc68SGustavo F. Padovan 28823df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 2883715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 28840a708f8fSGustavo F. Padovan continue; 28850a708f8fSGustavo F. Padovan 28867f5396a7SGustavo Padovan /* Don't send frame to the channel it came from */ 28877f5396a7SGustavo Padovan if (bt_cb(skb)->chan == chan) 28880a708f8fSGustavo F. Padovan continue; 28897f5396a7SGustavo Padovan 28908bcde1f2SGustavo Padovan nskb = skb_clone(skb, GFP_KERNEL); 28910a708f8fSGustavo F. Padovan if (!nskb) 28920a708f8fSGustavo F. Padovan continue; 289380b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 28940a708f8fSGustavo F. Padovan kfree_skb(nskb); 28950a708f8fSGustavo F. Padovan } 28963d57dc68SGustavo F. Padovan 28973df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 28980a708f8fSGustavo F. Padovan } 28990a708f8fSGustavo F. Padovan 29000a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2901b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2902b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 29030a708f8fSGustavo F. Padovan { 29040a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 29050a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 29060a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 29070a708f8fSGustavo F. Padovan int len, count; 29080a708f8fSGustavo F. Padovan 2909b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 29100a708f8fSGustavo F. Padovan conn, code, ident, dlen); 29110a708f8fSGustavo F. Padovan 2912300b962eSAnderson Lizardo if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) 2913300b962eSAnderson Lizardo return NULL; 2914300b962eSAnderson Lizardo 29150a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 29160a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 29170a708f8fSGustavo F. Padovan 29188bcde1f2SGustavo Padovan skb = bt_skb_alloc(count, GFP_KERNEL); 29190a708f8fSGustavo F. Padovan if (!skb) 29200a708f8fSGustavo F. Padovan return NULL; 29210a708f8fSGustavo F. Padovan 29220a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 29230a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 29243300d9a9SClaudio Takahasi 29253300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2926dcf4adbfSJoe Perches lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); 29273300d9a9SClaudio Takahasi else 2928dcf4adbfSJoe Perches lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); 29290a708f8fSGustavo F. Padovan 29300a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 29310a708f8fSGustavo F. Padovan cmd->code = code; 29320a708f8fSGustavo F. Padovan cmd->ident = ident; 29330a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 29340a708f8fSGustavo F. Padovan 29350a708f8fSGustavo F. Padovan if (dlen) { 29360a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 29370a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 29380a708f8fSGustavo F. Padovan data += count; 29390a708f8fSGustavo F. Padovan } 29400a708f8fSGustavo F. Padovan 29410a708f8fSGustavo F. Padovan len -= skb->len; 29420a708f8fSGustavo F. Padovan 29430a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 29440a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 29450a708f8fSGustavo F. Padovan while (len) { 29460a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 29470a708f8fSGustavo F. Padovan 29488bcde1f2SGustavo Padovan *frag = bt_skb_alloc(count, GFP_KERNEL); 29490a708f8fSGustavo F. Padovan if (!*frag) 29500a708f8fSGustavo F. Padovan goto fail; 29510a708f8fSGustavo F. Padovan 29520a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 29530a708f8fSGustavo F. Padovan 29540a708f8fSGustavo F. Padovan len -= count; 29550a708f8fSGustavo F. Padovan data += count; 29560a708f8fSGustavo F. Padovan 29570a708f8fSGustavo F. Padovan frag = &(*frag)->next; 29580a708f8fSGustavo F. Padovan } 29590a708f8fSGustavo F. Padovan 29600a708f8fSGustavo F. Padovan return skb; 29610a708f8fSGustavo F. Padovan 29620a708f8fSGustavo F. Padovan fail: 29630a708f8fSGustavo F. Padovan kfree_skb(skb); 29640a708f8fSGustavo F. Padovan return NULL; 29650a708f8fSGustavo F. Padovan } 29660a708f8fSGustavo F. Padovan 29672d792818SGustavo Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, 29682d792818SGustavo Padovan unsigned long *val) 29690a708f8fSGustavo F. Padovan { 29700a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 29710a708f8fSGustavo F. Padovan int len; 29720a708f8fSGustavo F. Padovan 29730a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 29740a708f8fSGustavo F. Padovan *ptr += len; 29750a708f8fSGustavo F. Padovan 29760a708f8fSGustavo F. Padovan *type = opt->type; 29770a708f8fSGustavo F. Padovan *olen = opt->len; 29780a708f8fSGustavo F. Padovan 29790a708f8fSGustavo F. Padovan switch (opt->len) { 29800a708f8fSGustavo F. Padovan case 1: 29810a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 29820a708f8fSGustavo F. Padovan break; 29830a708f8fSGustavo F. Padovan 29840a708f8fSGustavo F. Padovan case 2: 29850a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 29860a708f8fSGustavo F. Padovan break; 29870a708f8fSGustavo F. Padovan 29880a708f8fSGustavo F. Padovan case 4: 29890a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 29900a708f8fSGustavo F. Padovan break; 29910a708f8fSGustavo F. Padovan 29920a708f8fSGustavo F. Padovan default: 29930a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 29940a708f8fSGustavo F. Padovan break; 29950a708f8fSGustavo F. Padovan } 29960a708f8fSGustavo F. Padovan 2997b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 29980a708f8fSGustavo F. Padovan return len; 29990a708f8fSGustavo F. Padovan } 30000a708f8fSGustavo F. Padovan 30010a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 30020a708f8fSGustavo F. Padovan { 30030a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 30040a708f8fSGustavo F. Padovan 3005b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 30060a708f8fSGustavo F. Padovan 30070a708f8fSGustavo F. Padovan opt->type = type; 30080a708f8fSGustavo F. Padovan opt->len = len; 30090a708f8fSGustavo F. Padovan 30100a708f8fSGustavo F. Padovan switch (len) { 30110a708f8fSGustavo F. Padovan case 1: 30120a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 30130a708f8fSGustavo F. Padovan break; 30140a708f8fSGustavo F. Padovan 30150a708f8fSGustavo F. Padovan case 2: 30160a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 30170a708f8fSGustavo F. Padovan break; 30180a708f8fSGustavo F. Padovan 30190a708f8fSGustavo F. Padovan case 4: 30200a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 30210a708f8fSGustavo F. Padovan break; 30220a708f8fSGustavo F. Padovan 30230a708f8fSGustavo F. Padovan default: 30240a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 30250a708f8fSGustavo F. Padovan break; 30260a708f8fSGustavo F. Padovan } 30270a708f8fSGustavo F. Padovan 30280a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 30290a708f8fSGustavo F. Padovan } 30300a708f8fSGustavo F. Padovan 3031f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 3032f89cef09SAndrei Emeltchenko { 3033f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 3034f89cef09SAndrei Emeltchenko 3035f89cef09SAndrei Emeltchenko switch (chan->mode) { 3036f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 3037f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 3038f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 3039f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 3040f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 3041dcf4adbfSJoe Perches efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 3042dcf4adbfSJoe Perches efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); 3043f89cef09SAndrei Emeltchenko break; 3044f89cef09SAndrei Emeltchenko 3045f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 3046f89cef09SAndrei Emeltchenko efs.id = 1; 3047f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 3048f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 3049f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 3050f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 3051f89cef09SAndrei Emeltchenko efs.flush_to = 0; 3052f89cef09SAndrei Emeltchenko break; 3053f89cef09SAndrei Emeltchenko 3054f89cef09SAndrei Emeltchenko default: 3055f89cef09SAndrei Emeltchenko return; 3056f89cef09SAndrei Emeltchenko } 3057f89cef09SAndrei Emeltchenko 3058f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 3059f89cef09SAndrei Emeltchenko (unsigned long) &efs); 3060f89cef09SAndrei Emeltchenko } 3061f89cef09SAndrei Emeltchenko 3062721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 30630a708f8fSGustavo F. Padovan { 3064721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 3065721c4181SGustavo F. Padovan ack_timer.work); 30660362520bSMat Martineau u16 frames_to_ack; 30670a708f8fSGustavo F. Padovan 30682fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 30692fb9b3d4SGustavo F. Padovan 30706be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 30716be36555SAndrei Emeltchenko 30720362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 30730362520bSMat Martineau chan->last_acked_seq); 30740362520bSMat Martineau 30750362520bSMat Martineau if (frames_to_ack) 30760362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 30776be36555SAndrei Emeltchenko 30786be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 307909bfb2eeSSzymon Janc l2cap_chan_put(chan); 30800a708f8fSGustavo F. Padovan } 30810a708f8fSGustavo F. Padovan 3082466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 30830a708f8fSGustavo F. Padovan { 30843c588192SMat Martineau int err; 30853c588192SMat Martineau 3086105bdf9eSMat Martineau chan->next_tx_seq = 0; 3087105bdf9eSMat Martineau chan->expected_tx_seq = 0; 308842e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 30896a026610SGustavo F. Padovan chan->unacked_frames = 0; 309042e5c802SGustavo F. Padovan chan->buffer_seq = 0; 30916a026610SGustavo F. Padovan chan->frames_sent = 0; 3092105bdf9eSMat Martineau chan->last_acked_seq = 0; 3093105bdf9eSMat Martineau chan->sdu = NULL; 3094105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 3095105bdf9eSMat Martineau chan->sdu_len = 0; 3096105bdf9eSMat Martineau 3097d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 3098d34c34fbSMat Martineau 30996ed971caSMarcel Holtmann chan->local_amp_id = AMP_ID_BREDR; 31006ed971caSMarcel Holtmann chan->move_id = AMP_ID_BREDR; 310108333283SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 310208333283SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 310308333283SMat Martineau 3104105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 3105105bdf9eSMat Martineau return 0; 3106105bdf9eSMat Martineau 3107105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 3108105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 31090a708f8fSGustavo F. Padovan 3110721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 3111721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 3112721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 31130a708f8fSGustavo F. Padovan 3114f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 31150a708f8fSGustavo F. Padovan 31163c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 31173c588192SMat Martineau if (err < 0) 31183c588192SMat Martineau return err; 31193c588192SMat Martineau 31209dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 31219dc9affcSMat Martineau if (err < 0) 31229dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 31239dc9affcSMat Martineau 31249dc9affcSMat Martineau return err; 31250a708f8fSGustavo F. Padovan } 31260a708f8fSGustavo F. Padovan 31270a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 31280a708f8fSGustavo F. Padovan { 31290a708f8fSGustavo F. Padovan switch (mode) { 31300a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 31310a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 31320a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 31330a708f8fSGustavo F. Padovan return mode; 31340a708f8fSGustavo F. Padovan /* fall through */ 31350a708f8fSGustavo F. Padovan default: 31360a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 31370a708f8fSGustavo F. Padovan } 31380a708f8fSGustavo F. Padovan } 31390a708f8fSGustavo F. Padovan 3140848566b3SMarcel Holtmann static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) 31416327eb98SAndrei Emeltchenko { 3142848566b3SMarcel Holtmann return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; 31436327eb98SAndrei Emeltchenko } 31446327eb98SAndrei Emeltchenko 3145848566b3SMarcel Holtmann static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) 3146f89cef09SAndrei Emeltchenko { 3147848566b3SMarcel Holtmann return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; 3148f89cef09SAndrei Emeltchenko } 3149f89cef09SAndrei Emeltchenko 315036c86c85SMat Martineau static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, 315136c86c85SMat Martineau struct l2cap_conf_rfc *rfc) 315236c86c85SMat Martineau { 31536ed971caSMarcel Holtmann if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { 315436c86c85SMat Martineau u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; 315536c86c85SMat Martineau 315636c86c85SMat Martineau /* Class 1 devices have must have ERTM timeouts 315736c86c85SMat Martineau * exceeding the Link Supervision Timeout. The 315836c86c85SMat Martineau * default Link Supervision Timeout for AMP 315936c86c85SMat Martineau * controllers is 10 seconds. 316036c86c85SMat Martineau * 316136c86c85SMat Martineau * Class 1 devices use 0xffffffff for their 316236c86c85SMat Martineau * best-effort flush timeout, so the clamping logic 316336c86c85SMat Martineau * will result in a timeout that meets the above 316436c86c85SMat Martineau * requirement. ERTM timeouts are 16-bit values, so 316536c86c85SMat Martineau * the maximum timeout is 65.535 seconds. 316636c86c85SMat Martineau */ 316736c86c85SMat Martineau 316836c86c85SMat Martineau /* Convert timeout to milliseconds and round */ 316936c86c85SMat Martineau ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); 317036c86c85SMat Martineau 317136c86c85SMat Martineau /* This is the recommended formula for class 2 devices 317236c86c85SMat Martineau * that start ERTM timers when packets are sent to the 317336c86c85SMat Martineau * controller. 317436c86c85SMat Martineau */ 317536c86c85SMat Martineau ertm_to = 3 * ertm_to + 500; 317636c86c85SMat Martineau 317736c86c85SMat Martineau if (ertm_to > 0xffff) 317836c86c85SMat Martineau ertm_to = 0xffff; 317936c86c85SMat Martineau 318036c86c85SMat Martineau rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); 318136c86c85SMat Martineau rfc->monitor_timeout = rfc->retrans_timeout; 318236c86c85SMat Martineau } else { 3183dcf4adbfSJoe Perches rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 3184dcf4adbfSJoe Perches rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 318536c86c85SMat Martineau } 318636c86c85SMat Martineau } 318736c86c85SMat Martineau 31886327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 31896327eb98SAndrei Emeltchenko { 31906327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 3191848566b3SMarcel Holtmann __l2cap_ews_supported(chan->conn)) { 31926327eb98SAndrei Emeltchenko /* use extended control field */ 31936327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 3194836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 3195836be934SAndrei Emeltchenko } else { 31966327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 31976327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 3198836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 3199836be934SAndrei Emeltchenko } 3200c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 32016327eb98SAndrei Emeltchenko } 32026327eb98SAndrei Emeltchenko 3203710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 32040a708f8fSGustavo F. Padovan { 32050a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 32060c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 32070a708f8fSGustavo F. Padovan void *ptr = req->data; 3208c8f79162SAndrei Emeltchenko u16 size; 32090a708f8fSGustavo F. Padovan 321049208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 32110a708f8fSGustavo F. Padovan 321273ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 32130a708f8fSGustavo F. Padovan goto done; 32140a708f8fSGustavo F. Padovan 32150c1bc5c6SGustavo F. Padovan switch (chan->mode) { 32160a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 32170a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3218c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 32190a708f8fSGustavo F. Padovan break; 32200a708f8fSGustavo F. Padovan 3221848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 3222f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 3223f89cef09SAndrei Emeltchenko 32240a708f8fSGustavo F. Padovan /* fall through */ 32250a708f8fSGustavo F. Padovan default: 32268c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 32270a708f8fSGustavo F. Padovan break; 32280a708f8fSGustavo F. Padovan } 32290a708f8fSGustavo F. Padovan 32300a708f8fSGustavo F. Padovan done: 32310c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 32320c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 32330a708f8fSGustavo F. Padovan 32340c1bc5c6SGustavo F. Padovan switch (chan->mode) { 32350a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 32368c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 32378c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 32380a708f8fSGustavo F. Padovan break; 32390a708f8fSGustavo F. Padovan 32400a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 32410a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 32420a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 32430a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 32440a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 32450a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 32460a708f8fSGustavo F. Padovan 32470a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32480a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32490a708f8fSGustavo F. Padovan break; 32500a708f8fSGustavo F. Padovan 32510a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 32520a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 325347d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 325436c86c85SMat Martineau 325536c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 3256c8f79162SAndrei Emeltchenko 3257c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32582d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3259c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3260c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32610a708f8fSGustavo F. Padovan 32626327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 32636327eb98SAndrei Emeltchenko 32646327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 32656327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 32660a708f8fSGustavo F. Padovan 32670a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32680a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32690a708f8fSGustavo F. Padovan 3270f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3271f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3272f89cef09SAndrei Emeltchenko 32736327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 32746327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 32756327eb98SAndrei Emeltchenko chan->tx_win); 327660918918SAndrei Emeltchenko 327760918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 327860918918SAndrei Emeltchenko if (chan->fcs == L2CAP_FCS_NONE || 3279f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 328060918918SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 328160918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 328260918918SAndrei Emeltchenko chan->fcs); 328360918918SAndrei Emeltchenko } 32840a708f8fSGustavo F. Padovan break; 32850a708f8fSGustavo F. Padovan 32860a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3287273759e2SMat Martineau l2cap_txwin_setup(chan); 32880a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 32890a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 32900a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 32910a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 32920a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 3293c8f79162SAndrei Emeltchenko 3294c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32952d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3296c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3297c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32980a708f8fSGustavo F. Padovan 32990a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 33000a708f8fSGustavo F. Padovan (unsigned long) &rfc); 33010a708f8fSGustavo F. Padovan 3302f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3303f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3304f89cef09SAndrei Emeltchenko 330560918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 330647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 3307f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 330847d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 330960918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 331060918918SAndrei Emeltchenko chan->fcs); 33110a708f8fSGustavo F. Padovan } 33120a708f8fSGustavo F. Padovan break; 33130a708f8fSGustavo F. Padovan } 33140a708f8fSGustavo F. Padovan 3315fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 3316dcf4adbfSJoe Perches req->flags = cpu_to_le16(0); 33170a708f8fSGustavo F. Padovan 33180a708f8fSGustavo F. Padovan return ptr - data; 33190a708f8fSGustavo F. Padovan } 33200a708f8fSGustavo F. Padovan 332173ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 33220a708f8fSGustavo F. Padovan { 33230a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 33240a708f8fSGustavo F. Padovan void *ptr = rsp->data; 332573ffa904SGustavo F. Padovan void *req = chan->conf_req; 332673ffa904SGustavo F. Padovan int len = chan->conf_len; 33270a708f8fSGustavo F. Padovan int type, hint, olen; 33280a708f8fSGustavo F. Padovan unsigned long val; 33290a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 333042dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 333142dceae2SAndrei Emeltchenko u8 remote_efs = 0; 33320a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 33330a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 3334c8f79162SAndrei Emeltchenko u16 size; 33350a708f8fSGustavo F. Padovan 333673ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 33370a708f8fSGustavo F. Padovan 33380a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 33390a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 33400a708f8fSGustavo F. Padovan 33410a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 33420a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 33430a708f8fSGustavo F. Padovan 33440a708f8fSGustavo F. Padovan switch (type) { 33450a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 33460a708f8fSGustavo F. Padovan mtu = val; 33470a708f8fSGustavo F. Padovan break; 33480a708f8fSGustavo F. Padovan 33490a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 33500c1bc5c6SGustavo F. Padovan chan->flush_to = val; 33510a708f8fSGustavo F. Padovan break; 33520a708f8fSGustavo F. Padovan 33530a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 33540a708f8fSGustavo F. Padovan break; 33550a708f8fSGustavo F. Padovan 33560a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 33570a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 33580a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 33590a708f8fSGustavo F. Padovan break; 33600a708f8fSGustavo F. Padovan 33610a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 33620a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 3363f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, &chan->conf_state); 336442dceae2SAndrei Emeltchenko break; 33650a708f8fSGustavo F. Padovan 336642dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 336742dceae2SAndrei Emeltchenko remote_efs = 1; 336842dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 336942dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 33700a708f8fSGustavo F. Padovan break; 33710a708f8fSGustavo F. Padovan 33726327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3373848566b3SMarcel Holtmann if (!chan->conn->hs_enabled) 33746327eb98SAndrei Emeltchenko return -ECONNREFUSED; 33756327eb98SAndrei Emeltchenko 33766327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 33776327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 3378836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 33796327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 33800a708f8fSGustavo F. Padovan break; 33810a708f8fSGustavo F. Padovan 33820a708f8fSGustavo F. Padovan default: 33830a708f8fSGustavo F. Padovan if (hint) 33840a708f8fSGustavo F. Padovan break; 33850a708f8fSGustavo F. Padovan 33860a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 33870a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 33880a708f8fSGustavo F. Padovan break; 33890a708f8fSGustavo F. Padovan } 33900a708f8fSGustavo F. Padovan } 33910a708f8fSGustavo F. Padovan 339273ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 33930a708f8fSGustavo F. Padovan goto done; 33940a708f8fSGustavo F. Padovan 33950c1bc5c6SGustavo F. Padovan switch (chan->mode) { 33960a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 33970a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3398c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 33990c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 34008c1d787bSGustavo F. Padovan chan->conn->feat_mask); 34010a708f8fSGustavo F. Padovan break; 34020a708f8fSGustavo F. Padovan } 34030a708f8fSGustavo F. Padovan 340442dceae2SAndrei Emeltchenko if (remote_efs) { 3405848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 340642dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 340742dceae2SAndrei Emeltchenko else 340842dceae2SAndrei Emeltchenko return -ECONNREFUSED; 340942dceae2SAndrei Emeltchenko } 341042dceae2SAndrei Emeltchenko 34110c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 34120a708f8fSGustavo F. Padovan return -ECONNREFUSED; 34130a708f8fSGustavo F. Padovan 34140a708f8fSGustavo F. Padovan break; 34150a708f8fSGustavo F. Padovan } 34160a708f8fSGustavo F. Padovan 34170a708f8fSGustavo F. Padovan done: 34180c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 34190a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 34200c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 34210a708f8fSGustavo F. Padovan 342273ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 34230a708f8fSGustavo F. Padovan return -ECONNREFUSED; 34240a708f8fSGustavo F. Padovan 34252d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 34262d792818SGustavo Padovan (unsigned long) &rfc); 34270a708f8fSGustavo F. Padovan } 34280a708f8fSGustavo F. Padovan 34290a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 34300a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 34310a708f8fSGustavo F. Padovan * which ones we don't like. */ 34320a708f8fSGustavo F. Padovan 34330a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 34340a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 34350a708f8fSGustavo F. Padovan else { 34360c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3437c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 34380a708f8fSGustavo F. Padovan } 34390c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 34400a708f8fSGustavo F. Padovan 344142dceae2SAndrei Emeltchenko if (remote_efs) { 344242dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 344342dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 344442dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 344542dceae2SAndrei Emeltchenko 344642dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 344742dceae2SAndrei Emeltchenko 344842dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 344942dceae2SAndrei Emeltchenko return -ECONNREFUSED; 345042dceae2SAndrei Emeltchenko 345142dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 345242dceae2SAndrei Emeltchenko sizeof(efs), 345342dceae2SAndrei Emeltchenko (unsigned long) &efs); 34540e8b207eSAndrei Emeltchenko } else { 34553e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 34560e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 34570e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 345842dceae2SAndrei Emeltchenko } 345942dceae2SAndrei Emeltchenko } 346042dceae2SAndrei Emeltchenko 34610a708f8fSGustavo F. Padovan switch (rfc.mode) { 34620a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 346347d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3464c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34650a708f8fSGustavo F. Padovan break; 34660a708f8fSGustavo F. Padovan 34670a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 34686327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 34692c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 34706327eb98SAndrei Emeltchenko else 34716327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 34726327eb98SAndrei Emeltchenko 34732c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 34740a708f8fSGustavo F. Padovan 3475c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 34762d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 34772d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3478c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3479c8f79162SAndrei Emeltchenko chan->remote_mps = size; 34800a708f8fSGustavo F. Padovan 348136c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 34820a708f8fSGustavo F. Padovan 3483c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34840a708f8fSGustavo F. Padovan 34850a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 34860a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 34870a708f8fSGustavo F. Padovan 348842dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 348942dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 349042dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 349142dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 349242dceae2SAndrei Emeltchenko chan->remote_flush_to = 349342dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 349442dceae2SAndrei Emeltchenko chan->remote_acc_lat = 349542dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 349642dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 349742dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 349842dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 34992d792818SGustavo Padovan sizeof(efs), 35002d792818SGustavo Padovan (unsigned long) &efs); 350142dceae2SAndrei Emeltchenko } 35020a708f8fSGustavo F. Padovan break; 35030a708f8fSGustavo F. Padovan 35040a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3505c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 35062d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 35072d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3508c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3509c8f79162SAndrei Emeltchenko chan->remote_mps = size; 35100a708f8fSGustavo F. Padovan 3511c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 35120a708f8fSGustavo F. Padovan 35132d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 35142d792818SGustavo Padovan (unsigned long) &rfc); 35150a708f8fSGustavo F. Padovan 35160a708f8fSGustavo F. Padovan break; 35170a708f8fSGustavo F. Padovan 35180a708f8fSGustavo F. Padovan default: 35190a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 35200a708f8fSGustavo F. Padovan 35210a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 35220c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 35230a708f8fSGustavo F. Padovan } 35240a708f8fSGustavo F. Padovan 35250a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3526c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 35270a708f8fSGustavo F. Padovan } 3528fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 35290a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 3530dcf4adbfSJoe Perches rsp->flags = cpu_to_le16(0); 35310a708f8fSGustavo F. Padovan 35320a708f8fSGustavo F. Padovan return ptr - data; 35330a708f8fSGustavo F. Padovan } 35340a708f8fSGustavo F. Padovan 35352d792818SGustavo Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, 35362d792818SGustavo Padovan void *data, u16 *result) 35370a708f8fSGustavo F. Padovan { 35380a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 35390a708f8fSGustavo F. Padovan void *ptr = req->data; 35400a708f8fSGustavo F. Padovan int type, olen; 35410a708f8fSGustavo F. Padovan unsigned long val; 354236e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 354366af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 35440a708f8fSGustavo F. Padovan 3545fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 35460a708f8fSGustavo F. Padovan 35470a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 35480a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 35490a708f8fSGustavo F. Padovan 35500a708f8fSGustavo F. Padovan switch (type) { 35510a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 35520a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 35530a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 35540c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 35550a708f8fSGustavo F. Padovan } else 35560c1bc5c6SGustavo F. Padovan chan->imtu = val; 35570c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 35580a708f8fSGustavo F. Padovan break; 35590a708f8fSGustavo F. Padovan 35600a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 35610c1bc5c6SGustavo F. Padovan chan->flush_to = val; 35620a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 35630c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 35640a708f8fSGustavo F. Padovan break; 35650a708f8fSGustavo F. Padovan 35660a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 35670a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 35680a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 35690a708f8fSGustavo F. Padovan 3570c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 35710c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 35720a708f8fSGustavo F. Padovan return -ECONNREFUSED; 35730a708f8fSGustavo F. Padovan 357447d1ec61SGustavo F. Padovan chan->fcs = 0; 35750a708f8fSGustavo F. Padovan 35760a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 35770a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 35780a708f8fSGustavo F. Padovan break; 35796327eb98SAndrei Emeltchenko 35806327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3581c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 35823e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 35833e6b3b95SGustavo F. Padovan chan->tx_win); 35846327eb98SAndrei Emeltchenko break; 358566af7aafSAndrei Emeltchenko 358666af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 358766af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 358866af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 358966af7aafSAndrei Emeltchenko 359066af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 359166af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 359266af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 359366af7aafSAndrei Emeltchenko return -ECONNREFUSED; 359466af7aafSAndrei Emeltchenko 35952d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), 35962d792818SGustavo Padovan (unsigned long) &efs); 359766af7aafSAndrei Emeltchenko break; 3598cbabee78SAndrei Emeltchenko 3599cbabee78SAndrei Emeltchenko case L2CAP_CONF_FCS: 3600cbabee78SAndrei Emeltchenko if (*result == L2CAP_CONF_PENDING) 3601cbabee78SAndrei Emeltchenko if (val == L2CAP_FCS_NONE) 3602f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, 3603cbabee78SAndrei Emeltchenko &chan->conf_state); 3604cbabee78SAndrei Emeltchenko break; 36050a708f8fSGustavo F. Padovan } 36060a708f8fSGustavo F. Padovan } 36070a708f8fSGustavo F. Padovan 36080c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 36090a708f8fSGustavo F. Padovan return -ECONNREFUSED; 36100a708f8fSGustavo F. Padovan 36110c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 36120a708f8fSGustavo F. Padovan 36130e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 36140a708f8fSGustavo F. Padovan switch (rfc.mode) { 36150a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 361647d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 361747d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 361847d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3619c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3620c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3621c20f8e35SMat Martineau rfc.txwin_size); 362266af7aafSAndrei Emeltchenko 362366af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 362466af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 362566af7aafSAndrei Emeltchenko chan->local_sdu_itime = 362666af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 362766af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 362866af7aafSAndrei Emeltchenko chan->local_flush_to = 362966af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 363066af7aafSAndrei Emeltchenko } 36310a708f8fSGustavo F. Padovan break; 363266af7aafSAndrei Emeltchenko 36330a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 363447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 36350a708f8fSGustavo F. Padovan } 36360a708f8fSGustavo F. Padovan } 36370a708f8fSGustavo F. Padovan 3638fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 3639dcf4adbfSJoe Perches req->flags = cpu_to_le16(0); 36400a708f8fSGustavo F. Padovan 36410a708f8fSGustavo F. Padovan return ptr - data; 36420a708f8fSGustavo F. Padovan } 36430a708f8fSGustavo F. Padovan 36442d792818SGustavo Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, 36452d792818SGustavo Padovan u16 result, u16 flags) 36460a708f8fSGustavo F. Padovan { 36470a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 36480a708f8fSGustavo F. Padovan void *ptr = rsp->data; 36490a708f8fSGustavo F. Padovan 3650fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 36510a708f8fSGustavo F. Padovan 3652fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 36530a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 36540a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 36550a708f8fSGustavo F. Padovan 36560a708f8fSGustavo F. Padovan return ptr - data; 36570a708f8fSGustavo F. Padovan } 36580a708f8fSGustavo F. Padovan 365927e2d4c8SJohan Hedberg void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) 366027e2d4c8SJohan Hedberg { 366127e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 366227e2d4c8SJohan Hedberg struct l2cap_conn *conn = chan->conn; 366327e2d4c8SJohan Hedberg 366427e2d4c8SJohan Hedberg BT_DBG("chan %p", chan); 366527e2d4c8SJohan Hedberg 366627e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(chan->scid); 366727e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 36683916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 36690cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(chan->rx_credits); 3670dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 367127e2d4c8SJohan Hedberg 367227e2d4c8SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), 367327e2d4c8SJohan Hedberg &rsp); 367427e2d4c8SJohan Hedberg } 367527e2d4c8SJohan Hedberg 36768c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3677710f9b0aSGustavo F. Padovan { 3678710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 36798c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3680710f9b0aSGustavo F. Padovan u8 buf[128]; 3681439f34acSAndrei Emeltchenko u8 rsp_code; 3682710f9b0aSGustavo F. Padovan 3683fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3684fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3685dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 3686dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 3687439f34acSAndrei Emeltchenko 3688439f34acSAndrei Emeltchenko if (chan->hs_hcon) 3689439f34acSAndrei Emeltchenko rsp_code = L2CAP_CREATE_CHAN_RSP; 3690439f34acSAndrei Emeltchenko else 3691439f34acSAndrei Emeltchenko rsp_code = L2CAP_CONN_RSP; 3692439f34acSAndrei Emeltchenko 3693439f34acSAndrei Emeltchenko BT_DBG("chan %p rsp_code %u", chan, rsp_code); 3694439f34acSAndrei Emeltchenko 3695439f34acSAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); 3696710f9b0aSGustavo F. Padovan 3697c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3698710f9b0aSGustavo F. Padovan return; 3699710f9b0aSGustavo F. Padovan 3700710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3701710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3702710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3703710f9b0aSGustavo F. Padovan } 3704710f9b0aSGustavo F. Padovan 370547d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 37060a708f8fSGustavo F. Padovan { 37070a708f8fSGustavo F. Padovan int type, olen; 37080a708f8fSGustavo F. Padovan unsigned long val; 3709c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3710c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3711c20f8e35SMat Martineau */ 3712c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3713c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3714c20f8e35SMat Martineau .mode = chan->mode, 3715dcf4adbfSJoe Perches .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3716dcf4adbfSJoe Perches .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3717c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3718c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3719c20f8e35SMat Martineau }; 37200a708f8fSGustavo F. Padovan 372147d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 37220a708f8fSGustavo F. Padovan 37230c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 37240a708f8fSGustavo F. Padovan return; 37250a708f8fSGustavo F. Padovan 37260a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 37270a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 37280a708f8fSGustavo F. Padovan 3729c20f8e35SMat Martineau switch (type) { 3730c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3731c20f8e35SMat Martineau if (olen == sizeof(rfc)) 37320a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3733c20f8e35SMat Martineau break; 3734c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3735c20f8e35SMat Martineau txwin_ext = val; 3736c20f8e35SMat Martineau break; 3737c20f8e35SMat Martineau } 37380a708f8fSGustavo F. Padovan } 37390a708f8fSGustavo F. Padovan 37400a708f8fSGustavo F. Padovan switch (rfc.mode) { 37410a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 374247d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 374347d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 374447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3745c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3746c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3747c20f8e35SMat Martineau else 3748c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3749c20f8e35SMat Martineau rfc.txwin_size); 37500a708f8fSGustavo F. Padovan break; 37510a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 375247d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 37530a708f8fSGustavo F. Padovan } 37540a708f8fSGustavo F. Padovan } 37550a708f8fSGustavo F. Padovan 37562d792818SGustavo Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, 3757cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3758cb3b3152SJohan Hedberg u8 *data) 37590a708f8fSGustavo F. Padovan { 3760e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 37610a708f8fSGustavo F. Padovan 3762cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rej)) 3763cb3b3152SJohan Hedberg return -EPROTO; 3764cb3b3152SJohan Hedberg 3765e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 37660a708f8fSGustavo F. Padovan return 0; 37670a708f8fSGustavo F. Padovan 37680a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 37690a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 377017cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 37710a708f8fSGustavo F. Padovan 37720a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 37730a708f8fSGustavo F. Padovan conn->info_ident = 0; 37740a708f8fSGustavo F. Padovan 37750a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 37760a708f8fSGustavo F. Padovan } 37770a708f8fSGustavo F. Padovan 37780a708f8fSGustavo F. Padovan return 0; 37790a708f8fSGustavo F. Padovan } 37800a708f8fSGustavo F. Padovan 37811700915fSMat Martineau static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, 37821700915fSMat Martineau struct l2cap_cmd_hdr *cmd, 37834c89b6aaSMat Martineau u8 *data, u8 rsp_code, u8 amp_id) 37840a708f8fSGustavo F. Padovan { 37850a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 37860a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 378723691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 37880a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 37890a708f8fSGustavo F. Padovan 37900a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 37910a708f8fSGustavo F. Padovan __le16 psm = req->psm; 37920a708f8fSGustavo F. Padovan 3793097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 37940a708f8fSGustavo F. Padovan 37950a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 37966f59b904SMarcel Holtmann pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, 3797bf20fd4eSJohan Hedberg &conn->hcon->dst, ACL_LINK); 379823691d75SGustavo F. Padovan if (!pchan) { 37990a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 38000a708f8fSGustavo F. Padovan goto sendresp; 38010a708f8fSGustavo F. Padovan } 38020a708f8fSGustavo F. Padovan 38033df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 38048ffb9290SGustavo Padovan l2cap_chan_lock(pchan); 38050a708f8fSGustavo F. Padovan 38060a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 3807dcf4adbfSJoe Perches if (psm != cpu_to_le16(L2CAP_PSM_SDP) && 38080a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 38099f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 38100a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 38110a708f8fSGustavo F. Padovan goto response; 38120a708f8fSGustavo F. Padovan } 38130a708f8fSGustavo F. Padovan 38140a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 38150a708f8fSGustavo F. Padovan 38162dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 38172dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 38182dfa1003SGustavo Padovan goto response; 38192dfa1003SGustavo Padovan 382080b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 382180808e43SGustavo F. Padovan if (!chan) 38220a708f8fSGustavo F. Padovan goto response; 38230a708f8fSGustavo F. Padovan 3824330b6c15SSyam Sidhardhan /* For certain devices (ex: HID mouse), support for authentication, 3825330b6c15SSyam Sidhardhan * pairing and bonding is optional. For such devices, inorder to avoid 3826330b6c15SSyam Sidhardhan * the ACL alive for too long after L2CAP disconnection, reset the ACL 3827330b6c15SSyam Sidhardhan * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. 3828330b6c15SSyam Sidhardhan */ 3829330b6c15SSyam Sidhardhan conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 3830330b6c15SSyam Sidhardhan 38317eafc59eSMarcel Holtmann bacpy(&chan->src, &conn->hcon->src); 38327eafc59eSMarcel Holtmann bacpy(&chan->dst, &conn->hcon->dst); 38334f1654e0SMarcel Holtmann chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); 38344f1654e0SMarcel Holtmann chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); 3835fe4128e0SGustavo F. Padovan chan->psm = psm; 3836fe4128e0SGustavo F. Padovan chan->dcid = scid; 38371700915fSMat Martineau chan->local_amp_id = amp_id; 38380a708f8fSGustavo F. Padovan 38396be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 384048454079SGustavo F. Padovan 3841fe4128e0SGustavo F. Padovan dcid = chan->scid; 38420a708f8fSGustavo F. Padovan 38438d836d71SGustavo Padovan __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 38440a708f8fSGustavo F. Padovan 3845fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 38460a708f8fSGustavo F. Padovan 38470a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3848d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 3849bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 3850f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38510a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38520a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 38532dc4e510SGustavo Padovan chan->ops->defer(chan); 38540a708f8fSGustavo F. Padovan } else { 38551700915fSMat Martineau /* Force pending result for AMP controllers. 38561700915fSMat Martineau * The connection will succeed after the 38571700915fSMat Martineau * physical link is up. 38581700915fSMat Martineau */ 38596ed971caSMarcel Holtmann if (amp_id == AMP_ID_BREDR) { 3860f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 38610a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 38626ed971caSMarcel Holtmann } else { 3863f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38646ed971caSMarcel Holtmann result = L2CAP_CR_PEND; 38651700915fSMat Martineau } 38660a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38670a708f8fSGustavo F. Padovan } 38680a708f8fSGustavo F. Padovan } else { 3869f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38700a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38710a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 38720a708f8fSGustavo F. Padovan } 38730a708f8fSGustavo F. Padovan } else { 3874f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONNECT2); 38750a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38760a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38770a708f8fSGustavo F. Padovan } 38780a708f8fSGustavo F. Padovan 38790a708f8fSGustavo F. Padovan response: 38808ffb9290SGustavo Padovan l2cap_chan_unlock(pchan); 38813df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38820a708f8fSGustavo F. Padovan 38830a708f8fSGustavo F. Padovan sendresp: 38840a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 38850a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 38860a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 38870a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 38884c89b6aaSMat Martineau l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); 38890a708f8fSGustavo F. Padovan 38900a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 38910a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3892dcf4adbfSJoe Perches info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 38930a708f8fSGustavo F. Padovan 38940a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 38950a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 38960a708f8fSGustavo F. Padovan 3897ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 38980a708f8fSGustavo F. Padovan 38992d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 39002d792818SGustavo Padovan sizeof(info), &info); 39010a708f8fSGustavo F. Padovan } 39020a708f8fSGustavo F. Padovan 3903c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 39040a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 39050a708f8fSGustavo F. Padovan u8 buf[128]; 3906c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 39070a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 390873ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 390973ffa904SGustavo F. Padovan chan->num_conf_req++; 39100a708f8fSGustavo F. Padovan } 39111700915fSMat Martineau 39121700915fSMat Martineau return chan; 39134c89b6aaSMat Martineau } 39140a708f8fSGustavo F. Padovan 39154c89b6aaSMat Martineau static int l2cap_connect_req(struct l2cap_conn *conn, 3916cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 39174c89b6aaSMat Martineau { 39187b064edaSJaganath Kanakkassery struct hci_dev *hdev = conn->hcon->hdev; 39197b064edaSJaganath Kanakkassery struct hci_conn *hcon = conn->hcon; 39207b064edaSJaganath Kanakkassery 3921cb3b3152SJohan Hedberg if (cmd_len < sizeof(struct l2cap_conn_req)) 3922cb3b3152SJohan Hedberg return -EPROTO; 3923cb3b3152SJohan Hedberg 39247b064edaSJaganath Kanakkassery hci_dev_lock(hdev); 39257b064edaSJaganath Kanakkassery if (test_bit(HCI_MGMT, &hdev->dev_flags) && 39267b064edaSJaganath Kanakkassery !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) 39277b064edaSJaganath Kanakkassery mgmt_device_connected(hdev, &hcon->dst, hcon->type, 39287b064edaSJaganath Kanakkassery hcon->dst_type, 0, NULL, 0, 39297b064edaSJaganath Kanakkassery hcon->dev_class); 39307b064edaSJaganath Kanakkassery hci_dev_unlock(hdev); 39317b064edaSJaganath Kanakkassery 3932300229f9SGustavo Padovan l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); 39330a708f8fSGustavo F. Padovan return 0; 39340a708f8fSGustavo F. Padovan } 39350a708f8fSGustavo F. Padovan 39365909cf30SMat Martineau static int l2cap_connect_create_rsp(struct l2cap_conn *conn, 3937cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3938cb3b3152SJohan Hedberg u8 *data) 39390a708f8fSGustavo F. Padovan { 39400a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 39410a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 394248454079SGustavo F. Padovan struct l2cap_chan *chan; 39430a708f8fSGustavo F. Padovan u8 req[128]; 39443df91ea2SAndrei Emeltchenko int err; 39450a708f8fSGustavo F. Padovan 3946cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 3947cb3b3152SJohan Hedberg return -EPROTO; 3948cb3b3152SJohan Hedberg 39490a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 39500a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 39510a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 39520a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 39530a708f8fSGustavo F. Padovan 39541b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 39551b009c98SAndrei Emeltchenko dcid, scid, result, status); 39560a708f8fSGustavo F. Padovan 39573df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 39583df91ea2SAndrei Emeltchenko 39590a708f8fSGustavo F. Padovan if (scid) { 39603df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 39613df91ea2SAndrei Emeltchenko if (!chan) { 396221870b52SJohan Hedberg err = -EBADSLT; 39633df91ea2SAndrei Emeltchenko goto unlock; 39643df91ea2SAndrei Emeltchenko } 39650a708f8fSGustavo F. Padovan } else { 39663df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 39673df91ea2SAndrei Emeltchenko if (!chan) { 396821870b52SJohan Hedberg err = -EBADSLT; 39693df91ea2SAndrei Emeltchenko goto unlock; 39703df91ea2SAndrei Emeltchenko } 39710a708f8fSGustavo F. Padovan } 39720a708f8fSGustavo F. Padovan 39733df91ea2SAndrei Emeltchenko err = 0; 39743df91ea2SAndrei Emeltchenko 39756be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 397648454079SGustavo F. Padovan 39770a708f8fSGustavo F. Padovan switch (result) { 39780a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 397989bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3980fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3981fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3982c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 39830a708f8fSGustavo F. Padovan 3984c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 39850a708f8fSGustavo F. Padovan break; 39860a708f8fSGustavo F. Padovan 39870a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 398873ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 398973ffa904SGustavo F. Padovan chan->num_conf_req++; 39900a708f8fSGustavo F. Padovan break; 39910a708f8fSGustavo F. Padovan 39920a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3993c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 39940a708f8fSGustavo F. Padovan break; 39950a708f8fSGustavo F. Padovan 39960a708f8fSGustavo F. Padovan default: 399748454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 39980a708f8fSGustavo F. Padovan break; 39990a708f8fSGustavo F. Padovan } 40000a708f8fSGustavo F. Padovan 40016be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 40023df91ea2SAndrei Emeltchenko 40033df91ea2SAndrei Emeltchenko unlock: 40043df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 40053df91ea2SAndrei Emeltchenko 40063df91ea2SAndrei Emeltchenko return err; 40070a708f8fSGustavo F. Padovan } 40080a708f8fSGustavo F. Padovan 400947d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 40100a708f8fSGustavo F. Padovan { 40110a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 40120a708f8fSGustavo F. Padovan * sides request it. 40130a708f8fSGustavo F. Padovan */ 40140c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 401547d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 4016f2592d3eSAndrei Emeltchenko else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) 401747d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 40180a708f8fSGustavo F. Padovan } 40190a708f8fSGustavo F. Padovan 402029d8a590SAndrei Emeltchenko static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, 402129d8a590SAndrei Emeltchenko u8 ident, u16 flags) 402229d8a590SAndrei Emeltchenko { 402329d8a590SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 402429d8a590SAndrei Emeltchenko 402529d8a590SAndrei Emeltchenko BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, 402629d8a590SAndrei Emeltchenko flags); 402729d8a590SAndrei Emeltchenko 402829d8a590SAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 402929d8a590SAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 403029d8a590SAndrei Emeltchenko 403129d8a590SAndrei Emeltchenko l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, 403229d8a590SAndrei Emeltchenko l2cap_build_conf_rsp(chan, data, 403329d8a590SAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), data); 403429d8a590SAndrei Emeltchenko } 403529d8a590SAndrei Emeltchenko 4036662d652dSJohan Hedberg static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, 4037662d652dSJohan Hedberg u16 scid, u16 dcid) 4038662d652dSJohan Hedberg { 4039662d652dSJohan Hedberg struct l2cap_cmd_rej_cid rej; 4040662d652dSJohan Hedberg 4041dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); 4042662d652dSJohan Hedberg rej.scid = __cpu_to_le16(scid); 4043662d652dSJohan Hedberg rej.dcid = __cpu_to_le16(dcid); 4044662d652dSJohan Hedberg 4045662d652dSJohan Hedberg l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); 4046662d652dSJohan Hedberg } 4047662d652dSJohan Hedberg 40482d792818SGustavo Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, 40492d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 40502d792818SGustavo Padovan u8 *data) 40510a708f8fSGustavo F. Padovan { 40520a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 40530a708f8fSGustavo F. Padovan u16 dcid, flags; 40540a708f8fSGustavo F. Padovan u8 rsp[64]; 405548454079SGustavo F. Padovan struct l2cap_chan *chan; 40563c588192SMat Martineau int len, err = 0; 40570a708f8fSGustavo F. Padovan 4058cb3b3152SJohan Hedberg if (cmd_len < sizeof(*req)) 4059cb3b3152SJohan Hedberg return -EPROTO; 4060cb3b3152SJohan Hedberg 40610a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 40620a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 40630a708f8fSGustavo F. Padovan 40640a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 40650a708f8fSGustavo F. Padovan 4066baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 4067662d652dSJohan Hedberg if (!chan) { 4068662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); 4069662d652dSJohan Hedberg return 0; 4070662d652dSJohan Hedberg } 40710a708f8fSGustavo F. Padovan 4072033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 4073662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, 4074662d652dSJohan Hedberg chan->dcid); 40750a708f8fSGustavo F. Padovan goto unlock; 40760a708f8fSGustavo F. Padovan } 40770a708f8fSGustavo F. Padovan 40780a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 40790a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 4080cb3b3152SJohan Hedberg if (chan->conf_len + len > sizeof(chan->conf_req)) { 40810a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4082fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40830a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 40840a708f8fSGustavo F. Padovan goto unlock; 40850a708f8fSGustavo F. Padovan } 40860a708f8fSGustavo F. Padovan 40870a708f8fSGustavo F. Padovan /* Store config. */ 408873ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 408973ffa904SGustavo F. Padovan chan->conf_len += len; 40900a708f8fSGustavo F. Padovan 409159e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 40920a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 40930a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4094fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40955325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 40960a708f8fSGustavo F. Padovan goto unlock; 40970a708f8fSGustavo F. Padovan } 40980a708f8fSGustavo F. Padovan 40990a708f8fSGustavo F. Padovan /* Complete config. */ 410073ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 41010a708f8fSGustavo F. Padovan if (len < 0) { 41025e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41030a708f8fSGustavo F. Padovan goto unlock; 41040a708f8fSGustavo F. Padovan } 41050a708f8fSGustavo F. Padovan 41061500109bSMat Martineau chan->ident = cmd->ident; 41070a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 410873ffa904SGustavo F. Padovan chan->num_conf_rsp++; 41090a708f8fSGustavo F. Padovan 41100a708f8fSGustavo F. Padovan /* Reset config buffer. */ 411173ffa904SGustavo F. Padovan chan->conf_len = 0; 41120a708f8fSGustavo F. Padovan 4113c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 41140a708f8fSGustavo F. Padovan goto unlock; 41150a708f8fSGustavo F. Padovan 4116c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 411747d1ec61SGustavo F. Padovan set_default_fcs(chan); 41180a708f8fSGustavo F. Padovan 4119105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4120105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 41213c588192SMat Martineau err = l2cap_ertm_init(chan); 41220a708f8fSGustavo F. Padovan 41233c588192SMat Martineau if (err < 0) 41245e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 41253c588192SMat Martineau else 4126cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 41273c588192SMat Martineau 41280a708f8fSGustavo F. Padovan goto unlock; 41290a708f8fSGustavo F. Padovan } 41300a708f8fSGustavo F. Padovan 4131c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 41320a708f8fSGustavo F. Padovan u8 buf[64]; 41330a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 413473ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 413573ffa904SGustavo F. Padovan chan->num_conf_req++; 41360a708f8fSGustavo F. Padovan } 41370a708f8fSGustavo F. Padovan 41380e8b207eSAndrei Emeltchenko /* Got Conf Rsp PENDING from remote side and asume we sent 41390e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 41400e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 41410e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 41420e8b207eSAndrei Emeltchenko 41430e8b207eSAndrei Emeltchenko /* check compatibility */ 41440e8b207eSAndrei Emeltchenko 414579de886dSAndrei Emeltchenko /* Send rsp for BR/EDR channel */ 4146f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) 414729d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); 414879de886dSAndrei Emeltchenko else 414979de886dSAndrei Emeltchenko chan->ident = cmd->ident; 41500e8b207eSAndrei Emeltchenko } 41510e8b207eSAndrei Emeltchenko 41520a708f8fSGustavo F. Padovan unlock: 41536be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 41543c588192SMat Martineau return err; 41550a708f8fSGustavo F. Padovan } 41560a708f8fSGustavo F. Padovan 41572d792818SGustavo Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, 4158cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4159cb3b3152SJohan Hedberg u8 *data) 41600a708f8fSGustavo F. Padovan { 41610a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 41620a708f8fSGustavo F. Padovan u16 scid, flags, result; 416348454079SGustavo F. Padovan struct l2cap_chan *chan; 4164cb3b3152SJohan Hedberg int len = cmd_len - sizeof(*rsp); 41653c588192SMat Martineau int err = 0; 41660a708f8fSGustavo F. Padovan 4167cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 4168cb3b3152SJohan Hedberg return -EPROTO; 4169cb3b3152SJohan Hedberg 41700a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 41710a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 41720a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 41730a708f8fSGustavo F. Padovan 417461386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 417561386cbaSAndrei Emeltchenko result, len); 41760a708f8fSGustavo F. Padovan 4177baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 417848454079SGustavo F. Padovan if (!chan) 41790a708f8fSGustavo F. Padovan return 0; 41800a708f8fSGustavo F. Padovan 41810a708f8fSGustavo F. Padovan switch (result) { 41820a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 418347d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 41840e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41850a708f8fSGustavo F. Padovan break; 41860a708f8fSGustavo F. Padovan 41870e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 41880e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41890e8b207eSAndrei Emeltchenko 41900e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 41910e8b207eSAndrei Emeltchenko char buf[64]; 41920e8b207eSAndrei Emeltchenko 41930e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 41940e8b207eSAndrei Emeltchenko buf, &result); 41950e8b207eSAndrei Emeltchenko if (len < 0) { 41965e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41970e8b207eSAndrei Emeltchenko goto done; 41980e8b207eSAndrei Emeltchenko } 41990e8b207eSAndrei Emeltchenko 4200f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) { 420179de886dSAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 420279de886dSAndrei Emeltchenko 0); 42035ce66b59SAndrei Emeltchenko } else { 42045ce66b59SAndrei Emeltchenko if (l2cap_check_efs(chan)) { 42055ce66b59SAndrei Emeltchenko amp_create_logical_link(chan); 420679de886dSAndrei Emeltchenko chan->ident = cmd->ident; 42070e8b207eSAndrei Emeltchenko } 42085ce66b59SAndrei Emeltchenko } 42095ce66b59SAndrei Emeltchenko } 42100e8b207eSAndrei Emeltchenko goto done; 42110e8b207eSAndrei Emeltchenko 42120a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 421373ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 42140a708f8fSGustavo F. Padovan char req[64]; 42150a708f8fSGustavo F. Padovan 42160a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 42175e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42180a708f8fSGustavo F. Padovan goto done; 42190a708f8fSGustavo F. Padovan } 42200a708f8fSGustavo F. Padovan 42210a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 42220a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 4223b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 4224b4450035SGustavo F. Padovan req, &result); 42250a708f8fSGustavo F. Padovan if (len < 0) { 42265e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42270a708f8fSGustavo F. Padovan goto done; 42280a708f8fSGustavo F. Padovan } 42290a708f8fSGustavo F. Padovan 42300a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 42310a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 423273ffa904SGustavo F. Padovan chan->num_conf_req++; 42330a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 42340a708f8fSGustavo F. Padovan goto done; 42350a708f8fSGustavo F. Padovan break; 42360a708f8fSGustavo F. Padovan } 42370a708f8fSGustavo F. Padovan 42380a708f8fSGustavo F. Padovan default: 42396be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 42402e0052e4SAndrei Emeltchenko 4241ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 42425e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 42430a708f8fSGustavo F. Padovan goto done; 42440a708f8fSGustavo F. Padovan } 42450a708f8fSGustavo F. Padovan 424659e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 42470a708f8fSGustavo F. Padovan goto done; 42480a708f8fSGustavo F. Padovan 4249c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 42500a708f8fSGustavo F. Padovan 4251c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 425247d1ec61SGustavo F. Padovan set_default_fcs(chan); 42530a708f8fSGustavo F. Padovan 4254105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4255105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 42563c588192SMat Martineau err = l2cap_ertm_init(chan); 42570a708f8fSGustavo F. Padovan 42583c588192SMat Martineau if (err < 0) 42595e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 42603c588192SMat Martineau else 4261cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 42620a708f8fSGustavo F. Padovan } 42630a708f8fSGustavo F. Padovan 42640a708f8fSGustavo F. Padovan done: 42656be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 42663c588192SMat Martineau return err; 42670a708f8fSGustavo F. Padovan } 42680a708f8fSGustavo F. Padovan 42692d792818SGustavo Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, 4270cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4271cb3b3152SJohan Hedberg u8 *data) 42720a708f8fSGustavo F. Padovan { 42730a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 42740a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 42750a708f8fSGustavo F. Padovan u16 dcid, scid; 427648454079SGustavo F. Padovan struct l2cap_chan *chan; 42770a708f8fSGustavo F. Padovan 4278cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4279cb3b3152SJohan Hedberg return -EPROTO; 4280cb3b3152SJohan Hedberg 42810a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 42820a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 42830a708f8fSGustavo F. Padovan 42840a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 42850a708f8fSGustavo F. Padovan 42863df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 42873df91ea2SAndrei Emeltchenko 42883df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 42893df91ea2SAndrei Emeltchenko if (!chan) { 42903df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4291662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); 4292662d652dSJohan Hedberg return 0; 42933df91ea2SAndrei Emeltchenko } 42940a708f8fSGustavo F. Padovan 42956be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 42966be36555SAndrei Emeltchenko 4297fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4298fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 42990a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 43000a708f8fSGustavo F. Padovan 43015ec1bbe5SGustavo Padovan chan->ops->set_shutdown(chan); 43020a708f8fSGustavo F. Padovan 430361d6ef3eSMat Martineau l2cap_chan_hold(chan); 430448454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 43056be36555SAndrei Emeltchenko 43066be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 43070a708f8fSGustavo F. Padovan 430880b98027SGustavo Padovan chan->ops->close(chan); 430961d6ef3eSMat Martineau l2cap_chan_put(chan); 43103df91ea2SAndrei Emeltchenko 43113df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 43123df91ea2SAndrei Emeltchenko 43130a708f8fSGustavo F. Padovan return 0; 43140a708f8fSGustavo F. Padovan } 43150a708f8fSGustavo F. Padovan 43162d792818SGustavo Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, 4317cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4318cb3b3152SJohan Hedberg u8 *data) 43190a708f8fSGustavo F. Padovan { 43200a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 43210a708f8fSGustavo F. Padovan u16 dcid, scid; 432248454079SGustavo F. Padovan struct l2cap_chan *chan; 43230a708f8fSGustavo F. Padovan 4324cb3b3152SJohan Hedberg if (cmd_len != sizeof(*rsp)) 4325cb3b3152SJohan Hedberg return -EPROTO; 4326cb3b3152SJohan Hedberg 43270a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 43280a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 43290a708f8fSGustavo F. Padovan 43300a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 43310a708f8fSGustavo F. Padovan 43323df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 43333df91ea2SAndrei Emeltchenko 43343df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 43353df91ea2SAndrei Emeltchenko if (!chan) { 43363df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 43370a708f8fSGustavo F. Padovan return 0; 43383df91ea2SAndrei Emeltchenko } 43390a708f8fSGustavo F. Padovan 43406be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 434148454079SGustavo F. Padovan 434261d6ef3eSMat Martineau l2cap_chan_hold(chan); 434348454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 43446be36555SAndrei Emeltchenko 43456be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 43460a708f8fSGustavo F. Padovan 434780b98027SGustavo Padovan chan->ops->close(chan); 434861d6ef3eSMat Martineau l2cap_chan_put(chan); 43493df91ea2SAndrei Emeltchenko 43503df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 43513df91ea2SAndrei Emeltchenko 43520a708f8fSGustavo F. Padovan return 0; 43530a708f8fSGustavo F. Padovan } 43540a708f8fSGustavo F. Padovan 43552d792818SGustavo Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, 4356cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4357cb3b3152SJohan Hedberg u8 *data) 43580a708f8fSGustavo F. Padovan { 43590a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 43600a708f8fSGustavo F. Padovan u16 type; 43610a708f8fSGustavo F. Padovan 4362cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4363cb3b3152SJohan Hedberg return -EPROTO; 4364cb3b3152SJohan Hedberg 43650a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 43660a708f8fSGustavo F. Padovan 43670a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 43680a708f8fSGustavo F. Padovan 43690a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 43700a708f8fSGustavo F. Padovan u8 buf[8]; 43710a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 43720a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 4373dcf4adbfSJoe Perches rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); 4374dcf4adbfSJoe Perches rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 43750a708f8fSGustavo F. Padovan if (!disable_ertm) 43760a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 43770a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 4378848566b3SMarcel Holtmann if (conn->hs_enabled) 43796327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 43806327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 4381a5fd6f30SAndrei Emeltchenko 43820a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 43832d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43842d792818SGustavo Padovan buf); 43850a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 43860a708f8fSGustavo F. Padovan u8 buf[12]; 43870a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 438850a147cdSMat Martineau 4389848566b3SMarcel Holtmann if (conn->hs_enabled) 439050a147cdSMat Martineau l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; 439150a147cdSMat Martineau else 439250a147cdSMat Martineau l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; 439350a147cdSMat Martineau 4394dcf4adbfSJoe Perches rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 4395dcf4adbfSJoe Perches rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); 4396c6337ea6SAndrei Emeltchenko memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); 43972d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43982d792818SGustavo Padovan buf); 43990a708f8fSGustavo F. Padovan } else { 44000a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 44010a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 4402dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); 44032d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), 44042d792818SGustavo Padovan &rsp); 44050a708f8fSGustavo F. Padovan } 44060a708f8fSGustavo F. Padovan 44070a708f8fSGustavo F. Padovan return 0; 44080a708f8fSGustavo F. Padovan } 44090a708f8fSGustavo F. Padovan 44102d792818SGustavo Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, 4411cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4412cb3b3152SJohan Hedberg u8 *data) 44130a708f8fSGustavo F. Padovan { 44140a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 44150a708f8fSGustavo F. Padovan u16 type, result; 44160a708f8fSGustavo F. Padovan 44173f6fa3d4SJaganath Kanakkassery if (cmd_len < sizeof(*rsp)) 4418cb3b3152SJohan Hedberg return -EPROTO; 4419cb3b3152SJohan Hedberg 44200a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 44210a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 44220a708f8fSGustavo F. Padovan 44230a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 44240a708f8fSGustavo F. Padovan 4425e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 4426e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 4427e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 4428e90165beSAndrei Emeltchenko return 0; 4429e90165beSAndrei Emeltchenko 443017cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 44310a708f8fSGustavo F. Padovan 44320a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 44330a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44340a708f8fSGustavo F. Padovan conn->info_ident = 0; 44350a708f8fSGustavo F. Padovan 44360a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 44370a708f8fSGustavo F. Padovan 44380a708f8fSGustavo F. Padovan return 0; 44390a708f8fSGustavo F. Padovan } 44400a708f8fSGustavo F. Padovan 4441978c93b9SAndrei Emeltchenko switch (type) { 4442978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 44430a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 44440a708f8fSGustavo F. Padovan 44450a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 44460a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4447dcf4adbfSJoe Perches req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); 44480a708f8fSGustavo F. Padovan 44490a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 44500a708f8fSGustavo F. Padovan 44510a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 44520a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 44530a708f8fSGustavo F. Padovan } else { 44540a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44550a708f8fSGustavo F. Padovan conn->info_ident = 0; 44560a708f8fSGustavo F. Padovan 44570a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 44580a708f8fSGustavo F. Padovan } 4459978c93b9SAndrei Emeltchenko break; 4460978c93b9SAndrei Emeltchenko 4461978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 4462978c93b9SAndrei Emeltchenko conn->fixed_chan_mask = rsp->data[0]; 44630a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 44640a708f8fSGustavo F. Padovan conn->info_ident = 0; 44650a708f8fSGustavo F. Padovan 44660a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 4467978c93b9SAndrei Emeltchenko break; 44680a708f8fSGustavo F. Padovan } 44690a708f8fSGustavo F. Padovan 44700a708f8fSGustavo F. Padovan return 0; 44710a708f8fSGustavo F. Padovan } 44720a708f8fSGustavo F. Padovan 44731700915fSMat Martineau static int l2cap_create_channel_req(struct l2cap_conn *conn, 44742d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 44752d792818SGustavo Padovan u16 cmd_len, void *data) 4476f94ff6ffSMat Martineau { 4477f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 44786e1df6a6SAndrei Emeltchenko struct l2cap_create_chan_rsp rsp; 44791700915fSMat Martineau struct l2cap_chan *chan; 44806e1df6a6SAndrei Emeltchenko struct hci_dev *hdev; 4481f94ff6ffSMat Martineau u16 psm, scid; 4482f94ff6ffSMat Martineau 4483f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 4484f94ff6ffSMat Martineau return -EPROTO; 4485f94ff6ffSMat Martineau 4486848566b3SMarcel Holtmann if (!conn->hs_enabled) 4487f94ff6ffSMat Martineau return -EINVAL; 4488f94ff6ffSMat Martineau 4489f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 4490f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 4491f94ff6ffSMat Martineau 4492ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 4493f94ff6ffSMat Martineau 44946e1df6a6SAndrei Emeltchenko /* For controller id 0 make BR/EDR connection */ 44956ed971caSMarcel Holtmann if (req->amp_id == AMP_ID_BREDR) { 44966e1df6a6SAndrei Emeltchenko l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 44976e1df6a6SAndrei Emeltchenko req->amp_id); 44986e1df6a6SAndrei Emeltchenko return 0; 44996e1df6a6SAndrei Emeltchenko } 45001700915fSMat Martineau 45011700915fSMat Martineau /* Validate AMP controller id */ 45021700915fSMat Martineau hdev = hci_dev_get(req->amp_id); 45036e1df6a6SAndrei Emeltchenko if (!hdev) 45046e1df6a6SAndrei Emeltchenko goto error; 45051700915fSMat Martineau 45066e1df6a6SAndrei Emeltchenko if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { 45076e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 45086e1df6a6SAndrei Emeltchenko goto error; 45096e1df6a6SAndrei Emeltchenko } 45106e1df6a6SAndrei Emeltchenko 45116e1df6a6SAndrei Emeltchenko chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 45126e1df6a6SAndrei Emeltchenko req->amp_id); 45136e1df6a6SAndrei Emeltchenko if (chan) { 45146e1df6a6SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 45156e1df6a6SAndrei Emeltchenko struct hci_conn *hs_hcon; 45166e1df6a6SAndrei Emeltchenko 451798e0f7eaSMarcel Holtmann hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, 451898e0f7eaSMarcel Holtmann &conn->hcon->dst); 45196e1df6a6SAndrei Emeltchenko if (!hs_hcon) { 45206e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 4521662d652dSJohan Hedberg cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, 4522662d652dSJohan Hedberg chan->dcid); 4523662d652dSJohan Hedberg return 0; 45246e1df6a6SAndrei Emeltchenko } 45256e1df6a6SAndrei Emeltchenko 45266e1df6a6SAndrei Emeltchenko BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); 45276e1df6a6SAndrei Emeltchenko 45286e1df6a6SAndrei Emeltchenko mgr->bredr_chan = chan; 45296e1df6a6SAndrei Emeltchenko chan->hs_hcon = hs_hcon; 4530fd45bf4cSAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 45316e1df6a6SAndrei Emeltchenko conn->mtu = hdev->block_mtu; 45326e1df6a6SAndrei Emeltchenko } 45336e1df6a6SAndrei Emeltchenko 45346e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 45356e1df6a6SAndrei Emeltchenko 45366e1df6a6SAndrei Emeltchenko return 0; 45376e1df6a6SAndrei Emeltchenko 45386e1df6a6SAndrei Emeltchenko error: 4539f94ff6ffSMat Martineau rsp.dcid = 0; 4540f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 4541dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); 4542dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 4543f94ff6ffSMat Martineau 4544f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 4545f94ff6ffSMat Martineau sizeof(rsp), &rsp); 4546f94ff6ffSMat Martineau 4547dc280801SJohan Hedberg return 0; 4548f94ff6ffSMat Martineau } 4549f94ff6ffSMat Martineau 45508eb200bdSMat Martineau static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) 45518eb200bdSMat Martineau { 45528eb200bdSMat Martineau struct l2cap_move_chan_req req; 45538eb200bdSMat Martineau u8 ident; 45548eb200bdSMat Martineau 45558eb200bdSMat Martineau BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); 45568eb200bdSMat Martineau 45578eb200bdSMat Martineau ident = l2cap_get_ident(chan->conn); 45588eb200bdSMat Martineau chan->ident = ident; 45598eb200bdSMat Martineau 45608eb200bdSMat Martineau req.icid = cpu_to_le16(chan->scid); 45618eb200bdSMat Martineau req.dest_amp_id = dest_amp_id; 45628eb200bdSMat Martineau 45638eb200bdSMat Martineau l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), 45648eb200bdSMat Martineau &req); 45658eb200bdSMat Martineau 45668eb200bdSMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 45678eb200bdSMat Martineau } 45688eb200bdSMat Martineau 45691500109bSMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) 45708d5a04a1SMat Martineau { 45718d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 45728d5a04a1SMat Martineau 45731500109bSMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45748d5a04a1SMat Martineau 45751500109bSMat Martineau rsp.icid = cpu_to_le16(chan->dcid); 45768d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 45778d5a04a1SMat Martineau 45781500109bSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, 45791500109bSMat Martineau sizeof(rsp), &rsp); 45808d5a04a1SMat Martineau } 45818d5a04a1SMat Martineau 45825b155ef9SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) 45838d5a04a1SMat Martineau { 45848d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 45858d5a04a1SMat Martineau 45865b155ef9SMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45878d5a04a1SMat Martineau 45885b155ef9SMat Martineau chan->ident = l2cap_get_ident(chan->conn); 45898d5a04a1SMat Martineau 45905b155ef9SMat Martineau cfm.icid = cpu_to_le16(chan->scid); 45918d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 45928d5a04a1SMat Martineau 45935b155ef9SMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, 45945b155ef9SMat Martineau sizeof(cfm), &cfm); 45955b155ef9SMat Martineau 45965b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 45975b155ef9SMat Martineau } 45985b155ef9SMat Martineau 45995b155ef9SMat Martineau static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) 46005b155ef9SMat Martineau { 46015b155ef9SMat Martineau struct l2cap_move_chan_cfm cfm; 46025b155ef9SMat Martineau 46035b155ef9SMat Martineau BT_DBG("conn %p, icid 0x%4.4x", conn, icid); 46045b155ef9SMat Martineau 46055b155ef9SMat Martineau cfm.icid = cpu_to_le16(icid); 4606dcf4adbfSJoe Perches cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); 46075b155ef9SMat Martineau 46085b155ef9SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, 46095b155ef9SMat Martineau sizeof(cfm), &cfm); 46108d5a04a1SMat Martineau } 46118d5a04a1SMat Martineau 46128d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 46138d5a04a1SMat Martineau u16 icid) 46148d5a04a1SMat Martineau { 46158d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 46168d5a04a1SMat Martineau 4617ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 46188d5a04a1SMat Martineau 46198d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 46208d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 46218d5a04a1SMat Martineau } 46228d5a04a1SMat Martineau 46235f3847a4SMat Martineau static void __release_logical_link(struct l2cap_chan *chan) 46245f3847a4SMat Martineau { 46255f3847a4SMat Martineau chan->hs_hchan = NULL; 46265f3847a4SMat Martineau chan->hs_hcon = NULL; 46275f3847a4SMat Martineau 46285f3847a4SMat Martineau /* Placeholder - release the logical link */ 46295f3847a4SMat Martineau } 46305f3847a4SMat Martineau 46311500109bSMat Martineau static void l2cap_logical_fail(struct l2cap_chan *chan) 46321500109bSMat Martineau { 46331500109bSMat Martineau /* Logical link setup failed */ 46341500109bSMat Martineau if (chan->state != BT_CONNECTED) { 46351500109bSMat Martineau /* Create channel failure, disconnect */ 46365e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 46371500109bSMat Martineau return; 46381500109bSMat Martineau } 46391500109bSMat Martineau 46401500109bSMat Martineau switch (chan->move_role) { 46411500109bSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 46421500109bSMat Martineau l2cap_move_done(chan); 46431500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); 46441500109bSMat Martineau break; 46451500109bSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 46461500109bSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || 46471500109bSMat Martineau chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { 46481500109bSMat Martineau /* Remote has only sent pending or 46491500109bSMat Martineau * success responses, clean up 46501500109bSMat Martineau */ 46511500109bSMat Martineau l2cap_move_done(chan); 46521500109bSMat Martineau } 46531500109bSMat Martineau 46541500109bSMat Martineau /* Other amp move states imply that the move 46551500109bSMat Martineau * has already aborted 46561500109bSMat Martineau */ 46571500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 46581500109bSMat Martineau break; 46591500109bSMat Martineau } 46601500109bSMat Martineau } 46611500109bSMat Martineau 46621500109bSMat Martineau static void l2cap_logical_finish_create(struct l2cap_chan *chan, 46631500109bSMat Martineau struct hci_chan *hchan) 46641500109bSMat Martineau { 46651500109bSMat Martineau struct l2cap_conf_rsp rsp; 46661500109bSMat Martineau 4667336178a3SAndrei Emeltchenko chan->hs_hchan = hchan; 46681500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 46691500109bSMat Martineau 467035ba9561SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); 46711500109bSMat Martineau 46721500109bSMat Martineau if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 4673fe79c6feSAndrei Emeltchenko int err; 46741500109bSMat Martineau 46751500109bSMat Martineau set_default_fcs(chan); 46761500109bSMat Martineau 46771500109bSMat Martineau err = l2cap_ertm_init(chan); 46781500109bSMat Martineau if (err < 0) 46795e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 46801500109bSMat Martineau else 46811500109bSMat Martineau l2cap_chan_ready(chan); 46821500109bSMat Martineau } 46831500109bSMat Martineau } 46841500109bSMat Martineau 46851500109bSMat Martineau static void l2cap_logical_finish_move(struct l2cap_chan *chan, 46861500109bSMat Martineau struct hci_chan *hchan) 46871500109bSMat Martineau { 46881500109bSMat Martineau chan->hs_hcon = hchan->conn; 46891500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 46901500109bSMat Martineau 46911500109bSMat Martineau BT_DBG("move_state %d", chan->move_state); 46921500109bSMat Martineau 46931500109bSMat Martineau switch (chan->move_state) { 46941500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 46951500109bSMat Martineau /* Move confirm will be sent after a success 46961500109bSMat Martineau * response is received 46971500109bSMat Martineau */ 46981500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 46991500109bSMat Martineau break; 47001500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_CFM: 47011500109bSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 47021500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 47031500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 47041500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 47051500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 47061500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 47071500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 47081500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 47091500109bSMat Martineau } 47101500109bSMat Martineau break; 47111500109bSMat Martineau default: 47121500109bSMat Martineau /* Move was not in expected state, free the channel */ 47131500109bSMat Martineau __release_logical_link(chan); 47141500109bSMat Martineau 47151500109bSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 47161500109bSMat Martineau } 47171500109bSMat Martineau } 47181500109bSMat Martineau 47191500109bSMat Martineau /* Call with chan locked */ 472027695fb4SAndrei Emeltchenko void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, 47215b155ef9SMat Martineau u8 status) 47225b155ef9SMat Martineau { 47231500109bSMat Martineau BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); 47241500109bSMat Martineau 47251500109bSMat Martineau if (status) { 47261500109bSMat Martineau l2cap_logical_fail(chan); 47271500109bSMat Martineau __release_logical_link(chan); 47285b155ef9SMat Martineau return; 47295b155ef9SMat Martineau } 47305b155ef9SMat Martineau 47311500109bSMat Martineau if (chan->state != BT_CONNECTED) { 47321500109bSMat Martineau /* Ignore logical link if channel is on BR/EDR */ 47336ed971caSMarcel Holtmann if (chan->local_amp_id != AMP_ID_BREDR) 47341500109bSMat Martineau l2cap_logical_finish_create(chan, hchan); 47351500109bSMat Martineau } else { 47361500109bSMat Martineau l2cap_logical_finish_move(chan, hchan); 47371500109bSMat Martineau } 47381500109bSMat Martineau } 47391500109bSMat Martineau 47403f7a56c4SMat Martineau void l2cap_move_start(struct l2cap_chan *chan) 47413f7a56c4SMat Martineau { 47423f7a56c4SMat Martineau BT_DBG("chan %p", chan); 47433f7a56c4SMat Martineau 47446ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR) { 47453f7a56c4SMat Martineau if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) 47463f7a56c4SMat Martineau return; 47473f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 47483f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 47493f7a56c4SMat Martineau /* Placeholder - start physical link setup */ 47503f7a56c4SMat Martineau } else { 47513f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 47523f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 47533f7a56c4SMat Martineau chan->move_id = 0; 47543f7a56c4SMat Martineau l2cap_move_setup(chan); 47553f7a56c4SMat Martineau l2cap_send_move_chan_req(chan, 0); 47563f7a56c4SMat Martineau } 47573f7a56c4SMat Martineau } 47583f7a56c4SMat Martineau 47598eb200bdSMat Martineau static void l2cap_do_create(struct l2cap_chan *chan, int result, 47608eb200bdSMat Martineau u8 local_amp_id, u8 remote_amp_id) 47618eb200bdSMat Martineau { 476262748ca1SAndrei Emeltchenko BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), 476362748ca1SAndrei Emeltchenko local_amp_id, remote_amp_id); 476462748ca1SAndrei Emeltchenko 476512d6cc60SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 476612d6cc60SAndrei Emeltchenko 476762748ca1SAndrei Emeltchenko /* Outgoing channel on AMP */ 476862748ca1SAndrei Emeltchenko if (chan->state == BT_CONNECT) { 476962748ca1SAndrei Emeltchenko if (result == L2CAP_CR_SUCCESS) { 477062748ca1SAndrei Emeltchenko chan->local_amp_id = local_amp_id; 477162748ca1SAndrei Emeltchenko l2cap_send_create_chan_req(chan, remote_amp_id); 477262748ca1SAndrei Emeltchenko } else { 477362748ca1SAndrei Emeltchenko /* Revert to BR/EDR connect */ 477462748ca1SAndrei Emeltchenko l2cap_send_conn_req(chan); 477562748ca1SAndrei Emeltchenko } 477662748ca1SAndrei Emeltchenko 477762748ca1SAndrei Emeltchenko return; 477862748ca1SAndrei Emeltchenko } 477962748ca1SAndrei Emeltchenko 478062748ca1SAndrei Emeltchenko /* Incoming channel on AMP */ 478162748ca1SAndrei Emeltchenko if (__l2cap_no_conn_pending(chan)) { 47828eb200bdSMat Martineau struct l2cap_conn_rsp rsp; 47838eb200bdSMat Martineau char buf[128]; 47848eb200bdSMat Martineau rsp.scid = cpu_to_le16(chan->dcid); 47858eb200bdSMat Martineau rsp.dcid = cpu_to_le16(chan->scid); 47868eb200bdSMat Martineau 47878eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 47888eb200bdSMat Martineau /* Send successful response */ 4789dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); 4790dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 47918eb200bdSMat Martineau } else { 47928eb200bdSMat Martineau /* Send negative response */ 4793dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); 4794dcf4adbfSJoe Perches rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); 47958eb200bdSMat Martineau } 47968eb200bdSMat Martineau 47978eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, 47988eb200bdSMat Martineau sizeof(rsp), &rsp); 47998eb200bdSMat Martineau 48008eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 4801f93fa273SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 48028eb200bdSMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 48038eb200bdSMat Martineau l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), 48048eb200bdSMat Martineau L2CAP_CONF_REQ, 48058eb200bdSMat Martineau l2cap_build_conf_req(chan, buf), buf); 48068eb200bdSMat Martineau chan->num_conf_req++; 48078eb200bdSMat Martineau } 48088eb200bdSMat Martineau } 48098eb200bdSMat Martineau } 48108eb200bdSMat Martineau 48118eb200bdSMat Martineau static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, 48128eb200bdSMat Martineau u8 remote_amp_id) 48138eb200bdSMat Martineau { 48148eb200bdSMat Martineau l2cap_move_setup(chan); 48158eb200bdSMat Martineau chan->move_id = local_amp_id; 48168eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP; 48178eb200bdSMat Martineau 48188eb200bdSMat Martineau l2cap_send_move_chan_req(chan, remote_amp_id); 48198eb200bdSMat Martineau } 48208eb200bdSMat Martineau 48218eb200bdSMat Martineau static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) 48228eb200bdSMat Martineau { 48238eb200bdSMat Martineau struct hci_chan *hchan = NULL; 48248eb200bdSMat Martineau 48258eb200bdSMat Martineau /* Placeholder - get hci_chan for logical link */ 48268eb200bdSMat Martineau 48278eb200bdSMat Martineau if (hchan) { 48288eb200bdSMat Martineau if (hchan->state == BT_CONNECTED) { 48298eb200bdSMat Martineau /* Logical link is ready to go */ 48308eb200bdSMat Martineau chan->hs_hcon = hchan->conn; 48318eb200bdSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 48328eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 48338eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 48348eb200bdSMat Martineau 48358eb200bdSMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 48368eb200bdSMat Martineau } else { 48378eb200bdSMat Martineau /* Wait for logical link to be ready */ 48388eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 48398eb200bdSMat Martineau } 48408eb200bdSMat Martineau } else { 48418eb200bdSMat Martineau /* Logical link not available */ 48428eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); 48438eb200bdSMat Martineau } 48448eb200bdSMat Martineau } 48458eb200bdSMat Martineau 48468eb200bdSMat Martineau static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) 48478eb200bdSMat Martineau { 48488eb200bdSMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 48498eb200bdSMat Martineau u8 rsp_result; 48508eb200bdSMat Martineau if (result == -EINVAL) 48518eb200bdSMat Martineau rsp_result = L2CAP_MR_BAD_ID; 48528eb200bdSMat Martineau else 48538eb200bdSMat Martineau rsp_result = L2CAP_MR_NOT_ALLOWED; 48548eb200bdSMat Martineau 48558eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, rsp_result); 48568eb200bdSMat Martineau } 48578eb200bdSMat Martineau 48588eb200bdSMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 48598eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 48608eb200bdSMat Martineau 48618eb200bdSMat Martineau /* Restart data transmission */ 48628eb200bdSMat Martineau l2cap_ertm_send(chan); 48638eb200bdSMat Martineau } 48648eb200bdSMat Martineau 4865a514b17fSAndrei Emeltchenko /* Invoke with locked chan */ 4866a514b17fSAndrei Emeltchenko void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) 48678eb200bdSMat Martineau { 4868770bfefaSAndrei Emeltchenko u8 local_amp_id = chan->local_amp_id; 4869fffadc08SAndrei Emeltchenko u8 remote_amp_id = chan->remote_amp_id; 4870770bfefaSAndrei Emeltchenko 48718eb200bdSMat Martineau BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", 48728eb200bdSMat Martineau chan, result, local_amp_id, remote_amp_id); 48738eb200bdSMat Martineau 48748eb200bdSMat Martineau if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { 48758eb200bdSMat Martineau l2cap_chan_unlock(chan); 48768eb200bdSMat Martineau return; 48778eb200bdSMat Martineau } 48788eb200bdSMat Martineau 48798eb200bdSMat Martineau if (chan->state != BT_CONNECTED) { 48808eb200bdSMat Martineau l2cap_do_create(chan, result, local_amp_id, remote_amp_id); 48818eb200bdSMat Martineau } else if (result != L2CAP_MR_SUCCESS) { 48828eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48838eb200bdSMat Martineau } else { 48848eb200bdSMat Martineau switch (chan->move_role) { 48858eb200bdSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 48868eb200bdSMat Martineau l2cap_do_move_initiate(chan, local_amp_id, 48878eb200bdSMat Martineau remote_amp_id); 48888eb200bdSMat Martineau break; 48898eb200bdSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 48908eb200bdSMat Martineau l2cap_do_move_respond(chan, result); 48918eb200bdSMat Martineau break; 48928eb200bdSMat Martineau default: 48938eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48948eb200bdSMat Martineau break; 48958eb200bdSMat Martineau } 48968eb200bdSMat Martineau } 48978eb200bdSMat Martineau } 48988eb200bdSMat Martineau 48998d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4900ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4901ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 49028d5a04a1SMat Martineau { 49038d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 49041500109bSMat Martineau struct l2cap_move_chan_rsp rsp; 490502b0fbb9SMat Martineau struct l2cap_chan *chan; 49068d5a04a1SMat Martineau u16 icid = 0; 49078d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 49088d5a04a1SMat Martineau 49098d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 49108d5a04a1SMat Martineau return -EPROTO; 49118d5a04a1SMat Martineau 49128d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 49138d5a04a1SMat Martineau 4914ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 49158d5a04a1SMat Martineau 4916848566b3SMarcel Holtmann if (!conn->hs_enabled) 49178d5a04a1SMat Martineau return -EINVAL; 49188d5a04a1SMat Martineau 491902b0fbb9SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 492002b0fbb9SMat Martineau if (!chan) { 49211500109bSMat Martineau rsp.icid = cpu_to_le16(icid); 4922dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); 49231500109bSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, 49241500109bSMat Martineau sizeof(rsp), &rsp); 492502b0fbb9SMat Martineau return 0; 492602b0fbb9SMat Martineau } 492702b0fbb9SMat Martineau 49281500109bSMat Martineau chan->ident = cmd->ident; 49291500109bSMat Martineau 493002b0fbb9SMat Martineau if (chan->scid < L2CAP_CID_DYN_START || 493102b0fbb9SMat Martineau chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || 493202b0fbb9SMat Martineau (chan->mode != L2CAP_MODE_ERTM && 493302b0fbb9SMat Martineau chan->mode != L2CAP_MODE_STREAMING)) { 493402b0fbb9SMat Martineau result = L2CAP_MR_NOT_ALLOWED; 493502b0fbb9SMat Martineau goto send_move_response; 493602b0fbb9SMat Martineau } 493702b0fbb9SMat Martineau 493802b0fbb9SMat Martineau if (chan->local_amp_id == req->dest_amp_id) { 493902b0fbb9SMat Martineau result = L2CAP_MR_SAME_ID; 494002b0fbb9SMat Martineau goto send_move_response; 494102b0fbb9SMat Martineau } 494202b0fbb9SMat Martineau 49436ed971caSMarcel Holtmann if (req->dest_amp_id != AMP_ID_BREDR) { 494402b0fbb9SMat Martineau struct hci_dev *hdev; 494502b0fbb9SMat Martineau hdev = hci_dev_get(req->dest_amp_id); 494602b0fbb9SMat Martineau if (!hdev || hdev->dev_type != HCI_AMP || 494702b0fbb9SMat Martineau !test_bit(HCI_UP, &hdev->flags)) { 494802b0fbb9SMat Martineau if (hdev) 494902b0fbb9SMat Martineau hci_dev_put(hdev); 495002b0fbb9SMat Martineau 495102b0fbb9SMat Martineau result = L2CAP_MR_BAD_ID; 495202b0fbb9SMat Martineau goto send_move_response; 495302b0fbb9SMat Martineau } 495402b0fbb9SMat Martineau hci_dev_put(hdev); 495502b0fbb9SMat Martineau } 495602b0fbb9SMat Martineau 495702b0fbb9SMat Martineau /* Detect a move collision. Only send a collision response 495802b0fbb9SMat Martineau * if this side has "lost", otherwise proceed with the move. 495902b0fbb9SMat Martineau * The winner has the larger bd_addr. 496002b0fbb9SMat Martineau */ 496102b0fbb9SMat Martineau if ((__chan_is_moving(chan) || 496202b0fbb9SMat Martineau chan->move_role != L2CAP_MOVE_ROLE_NONE) && 49636f59b904SMarcel Holtmann bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { 496402b0fbb9SMat Martineau result = L2CAP_MR_COLLISION; 496502b0fbb9SMat Martineau goto send_move_response; 496602b0fbb9SMat Martineau } 496702b0fbb9SMat Martineau 496802b0fbb9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 496902b0fbb9SMat Martineau l2cap_move_setup(chan); 497002b0fbb9SMat Martineau chan->move_id = req->dest_amp_id; 497102b0fbb9SMat Martineau icid = chan->dcid; 497202b0fbb9SMat Martineau 49736ed971caSMarcel Holtmann if (req->dest_amp_id == AMP_ID_BREDR) { 497402b0fbb9SMat Martineau /* Moving to BR/EDR */ 497502b0fbb9SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 497602b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 497702b0fbb9SMat Martineau result = L2CAP_MR_PEND; 497802b0fbb9SMat Martineau } else { 497902b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 498002b0fbb9SMat Martineau result = L2CAP_MR_SUCCESS; 498102b0fbb9SMat Martineau } 498202b0fbb9SMat Martineau } else { 498302b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 498402b0fbb9SMat Martineau /* Placeholder - uncomment when amp functions are available */ 498502b0fbb9SMat Martineau /*amp_accept_physical(chan, req->dest_amp_id);*/ 498602b0fbb9SMat Martineau result = L2CAP_MR_PEND; 498702b0fbb9SMat Martineau } 498802b0fbb9SMat Martineau 498902b0fbb9SMat Martineau send_move_response: 49901500109bSMat Martineau l2cap_send_move_chan_rsp(chan, result); 49918d5a04a1SMat Martineau 499202b0fbb9SMat Martineau l2cap_chan_unlock(chan); 499302b0fbb9SMat Martineau 49948d5a04a1SMat Martineau return 0; 49958d5a04a1SMat Martineau } 49968d5a04a1SMat Martineau 49975b155ef9SMat Martineau static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) 49985b155ef9SMat Martineau { 49995b155ef9SMat Martineau struct l2cap_chan *chan; 50005b155ef9SMat Martineau struct hci_chan *hchan = NULL; 50015b155ef9SMat Martineau 50025b155ef9SMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 50035b155ef9SMat Martineau if (!chan) { 50045b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 50055b155ef9SMat Martineau return; 50065b155ef9SMat Martineau } 50075b155ef9SMat Martineau 50085b155ef9SMat Martineau __clear_chan_timer(chan); 50095b155ef9SMat Martineau if (result == L2CAP_MR_PEND) 50105b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); 50115b155ef9SMat Martineau 50125b155ef9SMat Martineau switch (chan->move_state) { 50135b155ef9SMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 50145b155ef9SMat Martineau /* Move confirm will be sent when logical link 50155b155ef9SMat Martineau * is complete. 50165b155ef9SMat Martineau */ 50175b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 50185b155ef9SMat Martineau break; 50195b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP_SUCCESS: 50205b155ef9SMat Martineau if (result == L2CAP_MR_PEND) { 50215b155ef9SMat Martineau break; 50225b155ef9SMat Martineau } else if (test_bit(CONN_LOCAL_BUSY, 50235b155ef9SMat Martineau &chan->conn_state)) { 50245b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 50255b155ef9SMat Martineau } else { 50265b155ef9SMat Martineau /* Logical link is up or moving to BR/EDR, 50275b155ef9SMat Martineau * proceed with move 50285b155ef9SMat Martineau */ 50295b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 50305b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 50315b155ef9SMat Martineau } 50325b155ef9SMat Martineau break; 50335b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP: 50345b155ef9SMat Martineau /* Moving to AMP */ 50355b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 50365b155ef9SMat Martineau /* Remote is ready, send confirm immediately 50375b155ef9SMat Martineau * after logical link is ready 50385b155ef9SMat Martineau */ 50395b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 50405b155ef9SMat Martineau } else { 50415b155ef9SMat Martineau /* Both logical link and move success 50425b155ef9SMat Martineau * are required to confirm 50435b155ef9SMat Martineau */ 50445b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; 50455b155ef9SMat Martineau } 50465b155ef9SMat Martineau 50475b155ef9SMat Martineau /* Placeholder - get hci_chan for logical link */ 50485b155ef9SMat Martineau if (!hchan) { 50495b155ef9SMat Martineau /* Logical link not available */ 50505b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50515b155ef9SMat Martineau break; 50525b155ef9SMat Martineau } 50535b155ef9SMat Martineau 50545b155ef9SMat Martineau /* If the logical link is not yet connected, do not 50555b155ef9SMat Martineau * send confirmation. 50565b155ef9SMat Martineau */ 50575b155ef9SMat Martineau if (hchan->state != BT_CONNECTED) 50585b155ef9SMat Martineau break; 50595b155ef9SMat Martineau 50605b155ef9SMat Martineau /* Logical link is already ready to go */ 50615b155ef9SMat Martineau 50625b155ef9SMat Martineau chan->hs_hcon = hchan->conn; 50635b155ef9SMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 50645b155ef9SMat Martineau 50655b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 50665b155ef9SMat Martineau /* Can confirm now */ 50675b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 50685b155ef9SMat Martineau } else { 50695b155ef9SMat Martineau /* Now only need move success 50705b155ef9SMat Martineau * to confirm 50715b155ef9SMat Martineau */ 50725b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 50735b155ef9SMat Martineau } 50745b155ef9SMat Martineau 50755b155ef9SMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 50765b155ef9SMat Martineau break; 50775b155ef9SMat Martineau default: 50785b155ef9SMat Martineau /* Any other amp move state means the move failed. */ 50795b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 50805b155ef9SMat Martineau l2cap_move_done(chan); 50815b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50825b155ef9SMat Martineau } 50835b155ef9SMat Martineau 50845b155ef9SMat Martineau l2cap_chan_unlock(chan); 50855b155ef9SMat Martineau } 50865b155ef9SMat Martineau 50875b155ef9SMat Martineau static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, 50885b155ef9SMat Martineau u16 result) 50895b155ef9SMat Martineau { 50905b155ef9SMat Martineau struct l2cap_chan *chan; 50915b155ef9SMat Martineau 50925b155ef9SMat Martineau chan = l2cap_get_chan_by_ident(conn, ident); 50935b155ef9SMat Martineau if (!chan) { 50945b155ef9SMat Martineau /* Could not locate channel, icid is best guess */ 50955b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 50965b155ef9SMat Martineau return; 50975b155ef9SMat Martineau } 50985b155ef9SMat Martineau 50995b155ef9SMat Martineau __clear_chan_timer(chan); 51005b155ef9SMat Martineau 51015b155ef9SMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 51025b155ef9SMat Martineau if (result == L2CAP_MR_COLLISION) { 51035b155ef9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 51045b155ef9SMat Martineau } else { 51055b155ef9SMat Martineau /* Cleanup - cancel move */ 51065b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 51075b155ef9SMat Martineau l2cap_move_done(chan); 51085b155ef9SMat Martineau } 51095b155ef9SMat Martineau } 51105b155ef9SMat Martineau 51115b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 51125b155ef9SMat Martineau 51135b155ef9SMat Martineau l2cap_chan_unlock(chan); 51145b155ef9SMat Martineau } 51155b155ef9SMat Martineau 51165b155ef9SMat Martineau static int l2cap_move_channel_rsp(struct l2cap_conn *conn, 5117ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5118ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51198d5a04a1SMat Martineau { 51208d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 51218d5a04a1SMat Martineau u16 icid, result; 51228d5a04a1SMat Martineau 51238d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 51248d5a04a1SMat Martineau return -EPROTO; 51258d5a04a1SMat Martineau 51268d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 51278d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 51288d5a04a1SMat Martineau 5129ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 51308d5a04a1SMat Martineau 51315b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) 51325b155ef9SMat Martineau l2cap_move_continue(conn, icid, result); 51335b155ef9SMat Martineau else 51345b155ef9SMat Martineau l2cap_move_fail(conn, cmd->ident, icid, result); 51358d5a04a1SMat Martineau 51368d5a04a1SMat Martineau return 0; 51378d5a04a1SMat Martineau } 51388d5a04a1SMat Martineau 51395f3847a4SMat Martineau static int l2cap_move_channel_confirm(struct l2cap_conn *conn, 5140ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5141ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51428d5a04a1SMat Martineau { 51438d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 51445f3847a4SMat Martineau struct l2cap_chan *chan; 51458d5a04a1SMat Martineau u16 icid, result; 51468d5a04a1SMat Martineau 51478d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 51488d5a04a1SMat Martineau return -EPROTO; 51498d5a04a1SMat Martineau 51508d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 51518d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 51528d5a04a1SMat Martineau 5153ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 51548d5a04a1SMat Martineau 51555f3847a4SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 51565f3847a4SMat Martineau if (!chan) { 51575f3847a4SMat Martineau /* Spec requires a response even if the icid was not found */ 51588d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 51595f3847a4SMat Martineau return 0; 51605f3847a4SMat Martineau } 51615f3847a4SMat Martineau 51625f3847a4SMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { 51635f3847a4SMat Martineau if (result == L2CAP_MC_CONFIRMED) { 51645f3847a4SMat Martineau chan->local_amp_id = chan->move_id; 51656ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR) 51665f3847a4SMat Martineau __release_logical_link(chan); 51675f3847a4SMat Martineau } else { 51685f3847a4SMat Martineau chan->move_id = chan->local_amp_id; 51695f3847a4SMat Martineau } 51705f3847a4SMat Martineau 51715f3847a4SMat Martineau l2cap_move_done(chan); 51725f3847a4SMat Martineau } 51735f3847a4SMat Martineau 51745f3847a4SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 51755f3847a4SMat Martineau 51765f3847a4SMat Martineau l2cap_chan_unlock(chan); 51778d5a04a1SMat Martineau 51788d5a04a1SMat Martineau return 0; 51798d5a04a1SMat Martineau } 51808d5a04a1SMat Martineau 51818d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 5182ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5183ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51848d5a04a1SMat Martineau { 51858d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 51863fd71a0aSMat Martineau struct l2cap_chan *chan; 51878d5a04a1SMat Martineau u16 icid; 51888d5a04a1SMat Martineau 51898d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 51908d5a04a1SMat Martineau return -EPROTO; 51918d5a04a1SMat Martineau 51928d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 51938d5a04a1SMat Martineau 5194ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 51958d5a04a1SMat Martineau 51963fd71a0aSMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 51973fd71a0aSMat Martineau if (!chan) 51983fd71a0aSMat Martineau return 0; 51993fd71a0aSMat Martineau 52003fd71a0aSMat Martineau __clear_chan_timer(chan); 52013fd71a0aSMat Martineau 52023fd71a0aSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { 52033fd71a0aSMat Martineau chan->local_amp_id = chan->move_id; 52043fd71a0aSMat Martineau 52056ed971caSMarcel Holtmann if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) 52063fd71a0aSMat Martineau __release_logical_link(chan); 52073fd71a0aSMat Martineau 52083fd71a0aSMat Martineau l2cap_move_done(chan); 52093fd71a0aSMat Martineau } 52103fd71a0aSMat Martineau 52113fd71a0aSMat Martineau l2cap_chan_unlock(chan); 52123fd71a0aSMat Martineau 52138d5a04a1SMat Martineau return 0; 52148d5a04a1SMat Martineau } 52158d5a04a1SMat Martineau 5216de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 52172d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 5218203e639eSJohan Hedberg u16 cmd_len, u8 *data) 5219de73115aSClaudio Takahasi { 5220de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 5221de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 5222de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 5223203e639eSJohan Hedberg u16 min, max, latency, to_multiplier; 52242ce603ebSClaudio Takahasi int err; 5225de73115aSClaudio Takahasi 52264dae2798SJohan Hedberg if (!test_bit(HCI_CONN_MASTER, &hcon->flags)) 5227de73115aSClaudio Takahasi return -EINVAL; 5228de73115aSClaudio Takahasi 5229de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 5230de73115aSClaudio Takahasi return -EPROTO; 5231de73115aSClaudio Takahasi 5232de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 5233de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 5234de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 5235de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 5236de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 5237de73115aSClaudio Takahasi 5238de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 5239de73115aSClaudio Takahasi min, max, latency, to_multiplier); 5240de73115aSClaudio Takahasi 5241de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 52422ce603ebSClaudio Takahasi 5243d4905f24SAndre Guedes err = hci_check_conn_params(min, max, latency, to_multiplier); 52442ce603ebSClaudio Takahasi if (err) 5245dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 5246de73115aSClaudio Takahasi else 5247dcf4adbfSJoe Perches rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 5248de73115aSClaudio Takahasi 5249de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 5250de73115aSClaudio Takahasi sizeof(rsp), &rsp); 5251de73115aSClaudio Takahasi 5252ffb5a827SAndre Guedes if (!err) { 5253*f4869e2aSJohan Hedberg u8 store_hint; 5254ffb5a827SAndre Guedes 5255*f4869e2aSJohan Hedberg store_hint = hci_le_conn_update(hcon, min, max, latency, 5256*f4869e2aSJohan Hedberg to_multiplier); 5257*f4869e2aSJohan Hedberg mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, 5258*f4869e2aSJohan Hedberg store_hint, min, max, latency, 5259*f4869e2aSJohan Hedberg to_multiplier); 5260*f4869e2aSJohan Hedberg 5261ffb5a827SAndre Guedes } 52622ce603ebSClaudio Takahasi 5263de73115aSClaudio Takahasi return 0; 5264de73115aSClaudio Takahasi } 5265de73115aSClaudio Takahasi 5266f1496deeSJohan Hedberg static int l2cap_le_connect_rsp(struct l2cap_conn *conn, 5267f1496deeSJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5268f1496deeSJohan Hedberg u8 *data) 5269f1496deeSJohan Hedberg { 5270f1496deeSJohan Hedberg struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; 5271f1496deeSJohan Hedberg u16 dcid, mtu, mps, credits, result; 5272f1496deeSJohan Hedberg struct l2cap_chan *chan; 5273f1496deeSJohan Hedberg int err; 5274f1496deeSJohan Hedberg 5275f1496deeSJohan Hedberg if (cmd_len < sizeof(*rsp)) 5276f1496deeSJohan Hedberg return -EPROTO; 5277f1496deeSJohan Hedberg 5278f1496deeSJohan Hedberg dcid = __le16_to_cpu(rsp->dcid); 5279f1496deeSJohan Hedberg mtu = __le16_to_cpu(rsp->mtu); 5280f1496deeSJohan Hedberg mps = __le16_to_cpu(rsp->mps); 5281f1496deeSJohan Hedberg credits = __le16_to_cpu(rsp->credits); 5282f1496deeSJohan Hedberg result = __le16_to_cpu(rsp->result); 5283f1496deeSJohan Hedberg 5284f1496deeSJohan Hedberg if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) 5285f1496deeSJohan Hedberg return -EPROTO; 5286f1496deeSJohan Hedberg 5287f1496deeSJohan Hedberg BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", 5288f1496deeSJohan Hedberg dcid, mtu, mps, credits, result); 5289f1496deeSJohan Hedberg 5290f1496deeSJohan Hedberg mutex_lock(&conn->chan_lock); 5291f1496deeSJohan Hedberg 5292f1496deeSJohan Hedberg chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 5293f1496deeSJohan Hedberg if (!chan) { 5294f1496deeSJohan Hedberg err = -EBADSLT; 5295f1496deeSJohan Hedberg goto unlock; 5296f1496deeSJohan Hedberg } 5297f1496deeSJohan Hedberg 5298f1496deeSJohan Hedberg err = 0; 5299f1496deeSJohan Hedberg 5300f1496deeSJohan Hedberg l2cap_chan_lock(chan); 5301f1496deeSJohan Hedberg 5302f1496deeSJohan Hedberg switch (result) { 5303f1496deeSJohan Hedberg case L2CAP_CR_SUCCESS: 5304f1496deeSJohan Hedberg chan->ident = 0; 5305f1496deeSJohan Hedberg chan->dcid = dcid; 5306f1496deeSJohan Hedberg chan->omtu = mtu; 5307f1496deeSJohan Hedberg chan->remote_mps = mps; 53080cd75f7eSJohan Hedberg chan->tx_credits = credits; 5309f1496deeSJohan Hedberg l2cap_chan_ready(chan); 5310f1496deeSJohan Hedberg break; 5311f1496deeSJohan Hedberg 5312f1496deeSJohan Hedberg default: 5313f1496deeSJohan Hedberg l2cap_chan_del(chan, ECONNREFUSED); 5314f1496deeSJohan Hedberg break; 5315f1496deeSJohan Hedberg } 5316f1496deeSJohan Hedberg 5317f1496deeSJohan Hedberg l2cap_chan_unlock(chan); 5318f1496deeSJohan Hedberg 5319f1496deeSJohan Hedberg unlock: 5320f1496deeSJohan Hedberg mutex_unlock(&conn->chan_lock); 5321f1496deeSJohan Hedberg 5322f1496deeSJohan Hedberg return err; 5323f1496deeSJohan Hedberg } 5324f1496deeSJohan Hedberg 53253300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 53262d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 53272d792818SGustavo Padovan u8 *data) 53283300d9a9SClaudio Takahasi { 53293300d9a9SClaudio Takahasi int err = 0; 53303300d9a9SClaudio Takahasi 53313300d9a9SClaudio Takahasi switch (cmd->code) { 53323300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 5333cb3b3152SJohan Hedberg l2cap_command_rej(conn, cmd, cmd_len, data); 53343300d9a9SClaudio Takahasi break; 53353300d9a9SClaudio Takahasi 53363300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 5337cb3b3152SJohan Hedberg err = l2cap_connect_req(conn, cmd, cmd_len, data); 53383300d9a9SClaudio Takahasi break; 53393300d9a9SClaudio Takahasi 53403300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 5341f5a2598dSMat Martineau case L2CAP_CREATE_CHAN_RSP: 53429245e737SJohan Hedberg l2cap_connect_create_rsp(conn, cmd, cmd_len, data); 53433300d9a9SClaudio Takahasi break; 53443300d9a9SClaudio Takahasi 53453300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 53463300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 53473300d9a9SClaudio Takahasi break; 53483300d9a9SClaudio Takahasi 53493300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 53509245e737SJohan Hedberg l2cap_config_rsp(conn, cmd, cmd_len, data); 53513300d9a9SClaudio Takahasi break; 53523300d9a9SClaudio Takahasi 53533300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 5354cb3b3152SJohan Hedberg err = l2cap_disconnect_req(conn, cmd, cmd_len, data); 53553300d9a9SClaudio Takahasi break; 53563300d9a9SClaudio Takahasi 53573300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 53589245e737SJohan Hedberg l2cap_disconnect_rsp(conn, cmd, cmd_len, data); 53593300d9a9SClaudio Takahasi break; 53603300d9a9SClaudio Takahasi 53613300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 53623300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 53633300d9a9SClaudio Takahasi break; 53643300d9a9SClaudio Takahasi 53653300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 53663300d9a9SClaudio Takahasi break; 53673300d9a9SClaudio Takahasi 53683300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 5369cb3b3152SJohan Hedberg err = l2cap_information_req(conn, cmd, cmd_len, data); 53703300d9a9SClaudio Takahasi break; 53713300d9a9SClaudio Takahasi 53723300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 53739245e737SJohan Hedberg l2cap_information_rsp(conn, cmd, cmd_len, data); 53743300d9a9SClaudio Takahasi break; 53753300d9a9SClaudio Takahasi 5376f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 5377f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 5378f94ff6ffSMat Martineau break; 5379f94ff6ffSMat Martineau 53808d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 53818d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 53828d5a04a1SMat Martineau break; 53838d5a04a1SMat Martineau 53848d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 53859245e737SJohan Hedberg l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 53868d5a04a1SMat Martineau break; 53878d5a04a1SMat Martineau 53888d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 53898d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 53908d5a04a1SMat Martineau break; 53918d5a04a1SMat Martineau 53928d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 53939245e737SJohan Hedberg l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 53948d5a04a1SMat Martineau break; 53958d5a04a1SMat Martineau 53963300d9a9SClaudio Takahasi default: 53973300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 53983300d9a9SClaudio Takahasi err = -EINVAL; 53993300d9a9SClaudio Takahasi break; 54003300d9a9SClaudio Takahasi } 54013300d9a9SClaudio Takahasi 54023300d9a9SClaudio Takahasi return err; 54033300d9a9SClaudio Takahasi } 54043300d9a9SClaudio Takahasi 540527e2d4c8SJohan Hedberg static int l2cap_le_connect_req(struct l2cap_conn *conn, 540627e2d4c8SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 540727e2d4c8SJohan Hedberg u8 *data) 540827e2d4c8SJohan Hedberg { 540927e2d4c8SJohan Hedberg struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; 541027e2d4c8SJohan Hedberg struct l2cap_le_conn_rsp rsp; 541127e2d4c8SJohan Hedberg struct l2cap_chan *chan, *pchan; 54120cd75f7eSJohan Hedberg u16 dcid, scid, credits, mtu, mps; 541327e2d4c8SJohan Hedberg __le16 psm; 541427e2d4c8SJohan Hedberg u8 result; 541527e2d4c8SJohan Hedberg 541627e2d4c8SJohan Hedberg if (cmd_len != sizeof(*req)) 541727e2d4c8SJohan Hedberg return -EPROTO; 541827e2d4c8SJohan Hedberg 541927e2d4c8SJohan Hedberg scid = __le16_to_cpu(req->scid); 542027e2d4c8SJohan Hedberg mtu = __le16_to_cpu(req->mtu); 542127e2d4c8SJohan Hedberg mps = __le16_to_cpu(req->mps); 542227e2d4c8SJohan Hedberg psm = req->psm; 542327e2d4c8SJohan Hedberg dcid = 0; 54240cd75f7eSJohan Hedberg credits = 0; 542527e2d4c8SJohan Hedberg 542627e2d4c8SJohan Hedberg if (mtu < 23 || mps < 23) 542727e2d4c8SJohan Hedberg return -EPROTO; 542827e2d4c8SJohan Hedberg 542927e2d4c8SJohan Hedberg BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), 543027e2d4c8SJohan Hedberg scid, mtu, mps); 543127e2d4c8SJohan Hedberg 543227e2d4c8SJohan Hedberg /* Check if we have socket listening on psm */ 543327e2d4c8SJohan Hedberg pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, 543427e2d4c8SJohan Hedberg &conn->hcon->dst, LE_LINK); 543527e2d4c8SJohan Hedberg if (!pchan) { 543627e2d4c8SJohan Hedberg result = L2CAP_CR_BAD_PSM; 543727e2d4c8SJohan Hedberg chan = NULL; 543827e2d4c8SJohan Hedberg goto response; 543927e2d4c8SJohan Hedberg } 544027e2d4c8SJohan Hedberg 544127e2d4c8SJohan Hedberg mutex_lock(&conn->chan_lock); 544227e2d4c8SJohan Hedberg l2cap_chan_lock(pchan); 544327e2d4c8SJohan Hedberg 544427e2d4c8SJohan Hedberg if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) { 544527e2d4c8SJohan Hedberg result = L2CAP_CR_AUTHENTICATION; 544627e2d4c8SJohan Hedberg chan = NULL; 544727e2d4c8SJohan Hedberg goto response_unlock; 544827e2d4c8SJohan Hedberg } 544927e2d4c8SJohan Hedberg 545027e2d4c8SJohan Hedberg /* Check if we already have channel with that dcid */ 545127e2d4c8SJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, scid)) { 545227e2d4c8SJohan Hedberg result = L2CAP_CR_NO_MEM; 545327e2d4c8SJohan Hedberg chan = NULL; 545427e2d4c8SJohan Hedberg goto response_unlock; 545527e2d4c8SJohan Hedberg } 545627e2d4c8SJohan Hedberg 545727e2d4c8SJohan Hedberg chan = pchan->ops->new_connection(pchan); 545827e2d4c8SJohan Hedberg if (!chan) { 545927e2d4c8SJohan Hedberg result = L2CAP_CR_NO_MEM; 546027e2d4c8SJohan Hedberg goto response_unlock; 546127e2d4c8SJohan Hedberg } 546227e2d4c8SJohan Hedberg 54630ce43ce6SJohan Hedberg l2cap_le_flowctl_init(chan); 54640ce43ce6SJohan Hedberg 546527e2d4c8SJohan Hedberg bacpy(&chan->src, &conn->hcon->src); 546627e2d4c8SJohan Hedberg bacpy(&chan->dst, &conn->hcon->dst); 546727e2d4c8SJohan Hedberg chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); 546827e2d4c8SJohan Hedberg chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); 546927e2d4c8SJohan Hedberg chan->psm = psm; 547027e2d4c8SJohan Hedberg chan->dcid = scid; 547127e2d4c8SJohan Hedberg chan->omtu = mtu; 547227e2d4c8SJohan Hedberg chan->remote_mps = mps; 54730cd75f7eSJohan Hedberg chan->tx_credits = __le16_to_cpu(req->credits); 547427e2d4c8SJohan Hedberg 547527e2d4c8SJohan Hedberg __l2cap_chan_add(conn, chan); 547627e2d4c8SJohan Hedberg dcid = chan->scid; 54770cd75f7eSJohan Hedberg credits = chan->rx_credits; 547827e2d4c8SJohan Hedberg 547927e2d4c8SJohan Hedberg __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 548027e2d4c8SJohan Hedberg 548127e2d4c8SJohan Hedberg chan->ident = cmd->ident; 548227e2d4c8SJohan Hedberg 548327e2d4c8SJohan Hedberg if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 548427e2d4c8SJohan Hedberg l2cap_state_change(chan, BT_CONNECT2); 548527e2d4c8SJohan Hedberg result = L2CAP_CR_PEND; 548627e2d4c8SJohan Hedberg chan->ops->defer(chan); 548727e2d4c8SJohan Hedberg } else { 548827e2d4c8SJohan Hedberg l2cap_chan_ready(chan); 548927e2d4c8SJohan Hedberg result = L2CAP_CR_SUCCESS; 549027e2d4c8SJohan Hedberg } 549127e2d4c8SJohan Hedberg 549227e2d4c8SJohan Hedberg response_unlock: 549327e2d4c8SJohan Hedberg l2cap_chan_unlock(pchan); 549427e2d4c8SJohan Hedberg mutex_unlock(&conn->chan_lock); 549527e2d4c8SJohan Hedberg 549627e2d4c8SJohan Hedberg if (result == L2CAP_CR_PEND) 549727e2d4c8SJohan Hedberg return 0; 549827e2d4c8SJohan Hedberg 549927e2d4c8SJohan Hedberg response: 550027e2d4c8SJohan Hedberg if (chan) { 550127e2d4c8SJohan Hedberg rsp.mtu = cpu_to_le16(chan->imtu); 55023916aed8SJohan Hedberg rsp.mps = cpu_to_le16(chan->mps); 550327e2d4c8SJohan Hedberg } else { 550427e2d4c8SJohan Hedberg rsp.mtu = 0; 550527e2d4c8SJohan Hedberg rsp.mps = 0; 550627e2d4c8SJohan Hedberg } 550727e2d4c8SJohan Hedberg 550827e2d4c8SJohan Hedberg rsp.dcid = cpu_to_le16(dcid); 55090cd75f7eSJohan Hedberg rsp.credits = cpu_to_le16(credits); 551027e2d4c8SJohan Hedberg rsp.result = cpu_to_le16(result); 551127e2d4c8SJohan Hedberg 551227e2d4c8SJohan Hedberg l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); 551327e2d4c8SJohan Hedberg 551427e2d4c8SJohan Hedberg return 0; 551527e2d4c8SJohan Hedberg } 551627e2d4c8SJohan Hedberg 5517fad5fc89SJohan Hedberg static inline int l2cap_le_credits(struct l2cap_conn *conn, 5518fad5fc89SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5519fad5fc89SJohan Hedberg u8 *data) 5520fad5fc89SJohan Hedberg { 5521fad5fc89SJohan Hedberg struct l2cap_le_credits *pkt; 5522fad5fc89SJohan Hedberg struct l2cap_chan *chan; 55230f1bfe4eSJohan Hedberg u16 cid, credits, max_credits; 5524fad5fc89SJohan Hedberg 5525fad5fc89SJohan Hedberg if (cmd_len != sizeof(*pkt)) 5526fad5fc89SJohan Hedberg return -EPROTO; 5527fad5fc89SJohan Hedberg 5528fad5fc89SJohan Hedberg pkt = (struct l2cap_le_credits *) data; 5529fad5fc89SJohan Hedberg cid = __le16_to_cpu(pkt->cid); 5530fad5fc89SJohan Hedberg credits = __le16_to_cpu(pkt->credits); 5531fad5fc89SJohan Hedberg 5532fad5fc89SJohan Hedberg BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); 5533fad5fc89SJohan Hedberg 5534fad5fc89SJohan Hedberg chan = l2cap_get_chan_by_dcid(conn, cid); 5535fad5fc89SJohan Hedberg if (!chan) 5536fad5fc89SJohan Hedberg return -EBADSLT; 5537fad5fc89SJohan Hedberg 55380f1bfe4eSJohan Hedberg max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; 55390f1bfe4eSJohan Hedberg if (credits > max_credits) { 55400f1bfe4eSJohan Hedberg BT_ERR("LE credits overflow"); 55410f1bfe4eSJohan Hedberg l2cap_send_disconn_req(chan, ECONNRESET); 55420f1bfe4eSJohan Hedberg 55430f1bfe4eSJohan Hedberg /* Return 0 so that we don't trigger an unnecessary 55440f1bfe4eSJohan Hedberg * command reject packet. 55450f1bfe4eSJohan Hedberg */ 55460f1bfe4eSJohan Hedberg return 0; 55470f1bfe4eSJohan Hedberg } 55480f1bfe4eSJohan Hedberg 5549fad5fc89SJohan Hedberg chan->tx_credits += credits; 5550fad5fc89SJohan Hedberg 5551fad5fc89SJohan Hedberg while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { 5552fad5fc89SJohan Hedberg l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); 5553fad5fc89SJohan Hedberg chan->tx_credits--; 5554fad5fc89SJohan Hedberg } 5555fad5fc89SJohan Hedberg 5556fad5fc89SJohan Hedberg if (chan->tx_credits) 5557fad5fc89SJohan Hedberg chan->ops->resume(chan); 5558fad5fc89SJohan Hedberg 5559fad5fc89SJohan Hedberg l2cap_chan_unlock(chan); 5560fad5fc89SJohan Hedberg 5561fad5fc89SJohan Hedberg return 0; 5562fad5fc89SJohan Hedberg } 5563fad5fc89SJohan Hedberg 556471fb4197SJohan Hedberg static inline int l2cap_le_command_rej(struct l2cap_conn *conn, 556571fb4197SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 556671fb4197SJohan Hedberg u8 *data) 556771fb4197SJohan Hedberg { 556871fb4197SJohan Hedberg struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 556971fb4197SJohan Hedberg struct l2cap_chan *chan; 557071fb4197SJohan Hedberg 557171fb4197SJohan Hedberg if (cmd_len < sizeof(*rej)) 557271fb4197SJohan Hedberg return -EPROTO; 557371fb4197SJohan Hedberg 557471fb4197SJohan Hedberg mutex_lock(&conn->chan_lock); 557571fb4197SJohan Hedberg 557671fb4197SJohan Hedberg chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 557771fb4197SJohan Hedberg if (!chan) 557871fb4197SJohan Hedberg goto done; 557971fb4197SJohan Hedberg 558071fb4197SJohan Hedberg l2cap_chan_lock(chan); 558171fb4197SJohan Hedberg l2cap_chan_del(chan, ECONNREFUSED); 558271fb4197SJohan Hedberg l2cap_chan_unlock(chan); 558371fb4197SJohan Hedberg 558471fb4197SJohan Hedberg done: 558571fb4197SJohan Hedberg mutex_unlock(&conn->chan_lock); 558671fb4197SJohan Hedberg return 0; 558771fb4197SJohan Hedberg } 558871fb4197SJohan Hedberg 55893300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 5590203e639eSJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 5591203e639eSJohan Hedberg u8 *data) 55923300d9a9SClaudio Takahasi { 5593b5ecba64SJohan Hedberg int err = 0; 5594b5ecba64SJohan Hedberg 55953300d9a9SClaudio Takahasi switch (cmd->code) { 55963300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 559771fb4197SJohan Hedberg l2cap_le_command_rej(conn, cmd, cmd_len, data); 5598b5ecba64SJohan Hedberg break; 55993300d9a9SClaudio Takahasi 56003300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 5601b5ecba64SJohan Hedberg err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); 5602b5ecba64SJohan Hedberg break; 56033300d9a9SClaudio Takahasi 56043300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 5605b5ecba64SJohan Hedberg break; 56063300d9a9SClaudio Takahasi 5607f1496deeSJohan Hedberg case L2CAP_LE_CONN_RSP: 5608f1496deeSJohan Hedberg l2cap_le_connect_rsp(conn, cmd, cmd_len, data); 5609b5ecba64SJohan Hedberg break; 5610f1496deeSJohan Hedberg 561127e2d4c8SJohan Hedberg case L2CAP_LE_CONN_REQ: 5612b5ecba64SJohan Hedberg err = l2cap_le_connect_req(conn, cmd, cmd_len, data); 5613b5ecba64SJohan Hedberg break; 561427e2d4c8SJohan Hedberg 5615fad5fc89SJohan Hedberg case L2CAP_LE_CREDITS: 5616fad5fc89SJohan Hedberg err = l2cap_le_credits(conn, cmd, cmd_len, data); 5617fad5fc89SJohan Hedberg break; 5618fad5fc89SJohan Hedberg 56193defe01aSJohan Hedberg case L2CAP_DISCONN_REQ: 5620b5ecba64SJohan Hedberg err = l2cap_disconnect_req(conn, cmd, cmd_len, data); 5621b5ecba64SJohan Hedberg break; 56223defe01aSJohan Hedberg 56233defe01aSJohan Hedberg case L2CAP_DISCONN_RSP: 56243defe01aSJohan Hedberg l2cap_disconnect_rsp(conn, cmd, cmd_len, data); 5625b5ecba64SJohan Hedberg break; 56263defe01aSJohan Hedberg 56273300d9a9SClaudio Takahasi default: 56283300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 5629b5ecba64SJohan Hedberg err = -EINVAL; 5630b5ecba64SJohan Hedberg break; 56313300d9a9SClaudio Takahasi } 5632b5ecba64SJohan Hedberg 5633b5ecba64SJohan Hedberg return err; 56343300d9a9SClaudio Takahasi } 56353300d9a9SClaudio Takahasi 5636c5623556SJohan Hedberg static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, 5637c5623556SJohan Hedberg struct sk_buff *skb) 5638c5623556SJohan Hedberg { 563969c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 56404f3e219dSMarcel Holtmann struct l2cap_cmd_hdr *cmd; 56414f3e219dSMarcel Holtmann u16 len; 5642c5623556SJohan Hedberg int err; 5643c5623556SJohan Hedberg 564469c4e4e8SJohan Hedberg if (hcon->type != LE_LINK) 56453b166295SMarcel Holtmann goto drop; 564669c4e4e8SJohan Hedberg 56474f3e219dSMarcel Holtmann if (skb->len < L2CAP_CMD_HDR_SIZE) 56484f3e219dSMarcel Holtmann goto drop; 5649c5623556SJohan Hedberg 56504f3e219dSMarcel Holtmann cmd = (void *) skb->data; 56514f3e219dSMarcel Holtmann skb_pull(skb, L2CAP_CMD_HDR_SIZE); 5652c5623556SJohan Hedberg 56534f3e219dSMarcel Holtmann len = le16_to_cpu(cmd->len); 5654c5623556SJohan Hedberg 56554f3e219dSMarcel Holtmann BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); 56564f3e219dSMarcel Holtmann 56574f3e219dSMarcel Holtmann if (len != skb->len || !cmd->ident) { 5658c5623556SJohan Hedberg BT_DBG("corrupted command"); 56594f3e219dSMarcel Holtmann goto drop; 5660c5623556SJohan Hedberg } 5661c5623556SJohan Hedberg 5662203e639eSJohan Hedberg err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); 5663c5623556SJohan Hedberg if (err) { 5664c5623556SJohan Hedberg struct l2cap_cmd_rej_unk rej; 5665c5623556SJohan Hedberg 5666c5623556SJohan Hedberg BT_ERR("Wrong link type (%d)", err); 5667c5623556SJohan Hedberg 5668dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 56694f3e219dSMarcel Holtmann l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 5670c5623556SJohan Hedberg sizeof(rej), &rej); 5671c5623556SJohan Hedberg } 5672c5623556SJohan Hedberg 56733b166295SMarcel Holtmann drop: 5674c5623556SJohan Hedberg kfree_skb(skb); 5675c5623556SJohan Hedberg } 5676c5623556SJohan Hedberg 56773300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 56783300d9a9SClaudio Takahasi struct sk_buff *skb) 56790a708f8fSGustavo F. Padovan { 568069c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 56810a708f8fSGustavo F. Padovan u8 *data = skb->data; 56820a708f8fSGustavo F. Padovan int len = skb->len; 56830a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 56843300d9a9SClaudio Takahasi int err; 56850a708f8fSGustavo F. Padovan 56860a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 56870a708f8fSGustavo F. Padovan 568869c4e4e8SJohan Hedberg if (hcon->type != ACL_LINK) 56893b166295SMarcel Holtmann goto drop; 569069c4e4e8SJohan Hedberg 56910a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 56920a708f8fSGustavo F. Padovan u16 cmd_len; 56930a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 56940a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 56950a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 56960a708f8fSGustavo F. Padovan 56970a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 56980a708f8fSGustavo F. Padovan 56992d792818SGustavo Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 57002d792818SGustavo Padovan cmd.ident); 57010a708f8fSGustavo F. Padovan 57020a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 57030a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 57040a708f8fSGustavo F. Padovan break; 57050a708f8fSGustavo F. Padovan } 57060a708f8fSGustavo F. Padovan 57073300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 57080a708f8fSGustavo F. Padovan if (err) { 5709e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 57102c6d1a2eSGustavo F. Padovan 57112c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 57120a708f8fSGustavo F. Padovan 5713dcf4adbfSJoe Perches rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 57142d792818SGustavo Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 57152d792818SGustavo Padovan sizeof(rej), &rej); 57160a708f8fSGustavo F. Padovan } 57170a708f8fSGustavo F. Padovan 57180a708f8fSGustavo F. Padovan data += cmd_len; 57190a708f8fSGustavo F. Padovan len -= cmd_len; 57200a708f8fSGustavo F. Padovan } 57210a708f8fSGustavo F. Padovan 57223b166295SMarcel Holtmann drop: 57230a708f8fSGustavo F. Padovan kfree_skb(skb); 57240a708f8fSGustavo F. Padovan } 57250a708f8fSGustavo F. Padovan 572647d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 57270a708f8fSGustavo F. Padovan { 57280a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 5729e4ca6d98SAndrei Emeltchenko int hdr_size; 5730e4ca6d98SAndrei Emeltchenko 5731e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 5732e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 5733e4ca6d98SAndrei Emeltchenko else 5734e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 57350a708f8fSGustavo F. Padovan 573647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 573703a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 57380a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 57390a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 57400a708f8fSGustavo F. Padovan 57410a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 57420a708f8fSGustavo F. Padovan return -EBADMSG; 57430a708f8fSGustavo F. Padovan } 57440a708f8fSGustavo F. Padovan return 0; 57450a708f8fSGustavo F. Padovan } 57460a708f8fSGustavo F. Padovan 57476ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 57480a708f8fSGustavo F. Padovan { 5749e31f7633SMat Martineau struct l2cap_ctrl control; 57500a708f8fSGustavo F. Padovan 5751e31f7633SMat Martineau BT_DBG("chan %p", chan); 57520a708f8fSGustavo F. Padovan 5753e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 5754e31f7633SMat Martineau control.sframe = 1; 5755e31f7633SMat Martineau control.final = 1; 5756e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 5757e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 57580a708f8fSGustavo F. Padovan 5759e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5760e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 5761e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 57620a708f8fSGustavo F. Padovan } 57630a708f8fSGustavo F. Padovan 5764e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 5765e31f7633SMat Martineau chan->unacked_frames > 0) 5766e31f7633SMat Martineau __set_retrans_timer(chan); 57670a708f8fSGustavo F. Padovan 5768e31f7633SMat Martineau /* Send pending iframes */ 5769525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 57700a708f8fSGustavo F. Padovan 5771e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 5772e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 5773e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 5774e31f7633SMat Martineau * send it now. 5775e31f7633SMat Martineau */ 5776e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 5777e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 57780a708f8fSGustavo F. Padovan } 57790a708f8fSGustavo F. Padovan } 57800a708f8fSGustavo F. Padovan 57812d792818SGustavo Padovan static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, 57822d792818SGustavo Padovan struct sk_buff **last_frag) 57830a708f8fSGustavo F. Padovan { 578484084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 578584084a31SMat Martineau * skb->data_len reflects only data in fragments 578684084a31SMat Martineau */ 578784084a31SMat Martineau if (!skb_has_frag_list(skb)) 578884084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 578984084a31SMat Martineau 579084084a31SMat Martineau new_frag->next = NULL; 579184084a31SMat Martineau 579284084a31SMat Martineau (*last_frag)->next = new_frag; 579384084a31SMat Martineau *last_frag = new_frag; 579484084a31SMat Martineau 579584084a31SMat Martineau skb->len += new_frag->len; 579684084a31SMat Martineau skb->data_len += new_frag->len; 579784084a31SMat Martineau skb->truesize += new_frag->truesize; 579884084a31SMat Martineau } 579984084a31SMat Martineau 58004b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 58014b51dae9SMat Martineau struct l2cap_ctrl *control) 580284084a31SMat Martineau { 580384084a31SMat Martineau int err = -EINVAL; 58040a708f8fSGustavo F. Padovan 58054b51dae9SMat Martineau switch (control->sar) { 58067e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 580784084a31SMat Martineau if (chan->sdu) 580884084a31SMat Martineau break; 58090a708f8fSGustavo F. Padovan 581080b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 581184084a31SMat Martineau break; 58120a708f8fSGustavo F. Padovan 58137e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 581484084a31SMat Martineau if (chan->sdu) 581584084a31SMat Martineau break; 58160a708f8fSGustavo F. Padovan 58176f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 581803a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 58190a708f8fSGustavo F. Padovan 582084084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 582184084a31SMat Martineau err = -EMSGSIZE; 582284084a31SMat Martineau break; 582384084a31SMat Martineau } 58240a708f8fSGustavo F. Padovan 582584084a31SMat Martineau if (skb->len >= chan->sdu_len) 582684084a31SMat Martineau break; 582784084a31SMat Martineau 582884084a31SMat Martineau chan->sdu = skb; 582984084a31SMat Martineau chan->sdu_last_frag = skb; 583084084a31SMat Martineau 583184084a31SMat Martineau skb = NULL; 583284084a31SMat Martineau err = 0; 58330a708f8fSGustavo F. Padovan break; 58340a708f8fSGustavo F. Padovan 58357e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 58366f61fd47SGustavo F. Padovan if (!chan->sdu) 583784084a31SMat Martineau break; 58380a708f8fSGustavo F. Padovan 583984084a31SMat Martineau append_skb_frag(chan->sdu, skb, 584084084a31SMat Martineau &chan->sdu_last_frag); 584184084a31SMat Martineau skb = NULL; 58420a708f8fSGustavo F. Padovan 584384084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 584484084a31SMat Martineau break; 58450a708f8fSGustavo F. Padovan 584684084a31SMat Martineau err = 0; 58470a708f8fSGustavo F. Padovan break; 58480a708f8fSGustavo F. Padovan 58497e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 58506f61fd47SGustavo F. Padovan if (!chan->sdu) 585184084a31SMat Martineau break; 58520a708f8fSGustavo F. Padovan 585384084a31SMat Martineau append_skb_frag(chan->sdu, skb, 585484084a31SMat Martineau &chan->sdu_last_frag); 585584084a31SMat Martineau skb = NULL; 58560a708f8fSGustavo F. Padovan 585784084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 585884084a31SMat Martineau break; 58590a708f8fSGustavo F. Padovan 586080b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 58610a708f8fSGustavo F. Padovan 586284084a31SMat Martineau if (!err) { 586384084a31SMat Martineau /* Reassembly complete */ 586484084a31SMat Martineau chan->sdu = NULL; 586584084a31SMat Martineau chan->sdu_last_frag = NULL; 586684084a31SMat Martineau chan->sdu_len = 0; 58670a708f8fSGustavo F. Padovan } 58680a708f8fSGustavo F. Padovan break; 58690a708f8fSGustavo F. Padovan } 58700a708f8fSGustavo F. Padovan 587184084a31SMat Martineau if (err) { 58720a708f8fSGustavo F. Padovan kfree_skb(skb); 58736f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 58746f61fd47SGustavo F. Padovan chan->sdu = NULL; 587584084a31SMat Martineau chan->sdu_last_frag = NULL; 587684084a31SMat Martineau chan->sdu_len = 0; 587784084a31SMat Martineau } 58780a708f8fSGustavo F. Padovan 587984084a31SMat Martineau return err; 58800a708f8fSGustavo F. Padovan } 58810a708f8fSGustavo F. Padovan 588232b32735SMat Martineau static int l2cap_resegment(struct l2cap_chan *chan) 588332b32735SMat Martineau { 588432b32735SMat Martineau /* Placeholder */ 588532b32735SMat Martineau return 0; 588632b32735SMat Martineau } 588732b32735SMat Martineau 5888e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 58890a708f8fSGustavo F. Padovan { 589061aa4f5bSMat Martineau u8 event; 589161aa4f5bSMat Martineau 589261aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 589361aa4f5bSMat Martineau return; 589461aa4f5bSMat Martineau 589561aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 5896401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 58970a708f8fSGustavo F. Padovan } 58980a708f8fSGustavo F. Padovan 5899d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 5900d2a7ac5dSMat Martineau { 590163838725SMat Martineau int err = 0; 590263838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 590363838725SMat Martineau * until a gap is encountered. 590463838725SMat Martineau */ 590563838725SMat Martineau 590663838725SMat Martineau BT_DBG("chan %p", chan); 590763838725SMat Martineau 590863838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 590963838725SMat Martineau struct sk_buff *skb; 591063838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 591163838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 591263838725SMat Martineau 591363838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 591463838725SMat Martineau 591563838725SMat Martineau if (!skb) 591663838725SMat Martineau break; 591763838725SMat Martineau 591863838725SMat Martineau skb_unlink(skb, &chan->srej_q); 591963838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 592063838725SMat Martineau err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); 592163838725SMat Martineau if (err) 592263838725SMat Martineau break; 592363838725SMat Martineau } 592463838725SMat Martineau 592563838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 592663838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 592763838725SMat Martineau l2cap_send_ack(chan); 592863838725SMat Martineau } 592963838725SMat Martineau 593063838725SMat Martineau return err; 5931d2a7ac5dSMat Martineau } 5932d2a7ac5dSMat Martineau 5933d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 5934d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5935d2a7ac5dSMat Martineau { 5936f80842a8SMat Martineau struct sk_buff *skb; 5937f80842a8SMat Martineau 5938f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 5939f80842a8SMat Martineau 5940f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 5941f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 59425e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5943f80842a8SMat Martineau return; 5944f80842a8SMat Martineau } 5945f80842a8SMat Martineau 5946f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5947f80842a8SMat Martineau 5948f80842a8SMat Martineau if (skb == NULL) { 5949f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 5950f80842a8SMat Martineau control->reqseq); 5951f80842a8SMat Martineau return; 5952f80842a8SMat Martineau } 5953f80842a8SMat Martineau 5954f80842a8SMat Martineau if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { 5955f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 59565e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5957f80842a8SMat Martineau return; 5958f80842a8SMat Martineau } 5959f80842a8SMat Martineau 5960f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5961f80842a8SMat Martineau 5962f80842a8SMat Martineau if (control->poll) { 5963f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 5964f80842a8SMat Martineau 5965f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5966f80842a8SMat Martineau l2cap_retransmit(chan, control); 5967f80842a8SMat Martineau l2cap_ertm_send(chan); 5968f80842a8SMat Martineau 5969f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5970f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5971f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5972f80842a8SMat Martineau } 5973f80842a8SMat Martineau } else { 5974f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 5975f80842a8SMat Martineau 5976f80842a8SMat Martineau if (control->final) { 5977f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 5978f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 5979f80842a8SMat Martineau &chan->conn_state)) 5980f80842a8SMat Martineau l2cap_retransmit(chan, control); 5981f80842a8SMat Martineau } else { 5982f80842a8SMat Martineau l2cap_retransmit(chan, control); 5983f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5984f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5985f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5986f80842a8SMat Martineau } 5987f80842a8SMat Martineau } 5988f80842a8SMat Martineau } 5989d2a7ac5dSMat Martineau } 5990d2a7ac5dSMat Martineau 5991d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 5992d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5993d2a7ac5dSMat Martineau { 5994fcd289dfSMat Martineau struct sk_buff *skb; 5995fcd289dfSMat Martineau 5996fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 5997fcd289dfSMat Martineau 5998fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 5999fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 60005e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6001fcd289dfSMat Martineau return; 6002fcd289dfSMat Martineau } 6003fcd289dfSMat Martineau 6004fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 6005fcd289dfSMat Martineau 6006fcd289dfSMat Martineau if (chan->max_tx && skb && 6007fcd289dfSMat Martineau bt_cb(skb)->control.retries >= chan->max_tx) { 6008fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 60095e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6010fcd289dfSMat Martineau return; 6011fcd289dfSMat Martineau } 6012fcd289dfSMat Martineau 6013fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6014fcd289dfSMat Martineau 6015fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 6016fcd289dfSMat Martineau 6017fcd289dfSMat Martineau if (control->final) { 6018fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 6019fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 6020fcd289dfSMat Martineau } else { 6021fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 6022fcd289dfSMat Martineau l2cap_ertm_send(chan); 6023fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 6024fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 6025fcd289dfSMat Martineau } 6026d2a7ac5dSMat Martineau } 6027d2a7ac5dSMat Martineau 60284b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 60294b51dae9SMat Martineau { 60304b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 60314b51dae9SMat Martineau 60324b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 60334b51dae9SMat Martineau chan->expected_tx_seq); 60344b51dae9SMat Martineau 60354b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 60364b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 60374b51dae9SMat Martineau chan->tx_win) { 60384b51dae9SMat Martineau /* See notes below regarding "double poll" and 60394b51dae9SMat Martineau * invalid packets. 60404b51dae9SMat Martineau */ 60414b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 60424b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 60434b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 60444b51dae9SMat Martineau } else { 60454b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 60464b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 60474b51dae9SMat Martineau } 60484b51dae9SMat Martineau } 60494b51dae9SMat Martineau 60504b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 60514b51dae9SMat Martineau BT_DBG("Expected SREJ"); 60524b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 60534b51dae9SMat Martineau } 60544b51dae9SMat Martineau 60554b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 60564b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 60574b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 60584b51dae9SMat Martineau } 60594b51dae9SMat Martineau 60604b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 60614b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 60624b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 60634b51dae9SMat Martineau } 60644b51dae9SMat Martineau } 60654b51dae9SMat Martineau 60664b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 60674b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 60684b51dae9SMat Martineau chan->tx_win) { 60694b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 60704b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 60714b51dae9SMat Martineau } else { 60724b51dae9SMat Martineau BT_DBG("Expected"); 60734b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 60744b51dae9SMat Martineau } 60754b51dae9SMat Martineau } 60764b51dae9SMat Martineau 60774b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 60782d792818SGustavo Padovan __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { 60794b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 60804b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 60814b51dae9SMat Martineau } 60824b51dae9SMat Martineau 60834b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 60844b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 60854b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 60864b51dae9SMat Martineau * the remote stack receives and processes both polls, 60874b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 60884b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 60894b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 60904b51dae9SMat Martineau * request. 60914b51dae9SMat Martineau * 60924b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 60934b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 60944b51dae9SMat Martineau * invalid frames to be safely ignored. 60954b51dae9SMat Martineau * 60964b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 60974b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 60984b51dae9SMat Martineau * causes a disconnect. 60994b51dae9SMat Martineau */ 61004b51dae9SMat Martineau 61014b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 61024b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 61034b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 61044b51dae9SMat Martineau } else { 61054b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 61064b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 61074b51dae9SMat Martineau } 61084b51dae9SMat Martineau } else { 61094b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 61104b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 61114b51dae9SMat Martineau } 61124b51dae9SMat Martineau } 61134b51dae9SMat Martineau 6114d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 6115d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 6116d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 6117d2a7ac5dSMat Martineau { 6118d2a7ac5dSMat Martineau int err = 0; 6119941247f9SPeter Senna Tschudin bool skb_in_use = false; 6120d2a7ac5dSMat Martineau 6121d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 6122d2a7ac5dSMat Martineau event); 6123d2a7ac5dSMat Martineau 6124d2a7ac5dSMat Martineau switch (event) { 6125d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 6126d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 6127d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 6128d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6129d2a7ac5dSMat Martineau 6130d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 6131d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 6132d2a7ac5dSMat Martineau control->txseq); 6133d2a7ac5dSMat Martineau break; 6134d2a7ac5dSMat Martineau } 6135d2a7ac5dSMat Martineau 6136d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 6137d2a7ac5dSMat Martineau control->txseq); 6138d2a7ac5dSMat Martineau 6139d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 6140941247f9SPeter Senna Tschudin skb_in_use = true; 6141d2a7ac5dSMat Martineau 6142d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 6143d2a7ac5dSMat Martineau if (err) 6144d2a7ac5dSMat Martineau break; 6145d2a7ac5dSMat Martineau 6146d2a7ac5dSMat Martineau if (control->final) { 6147d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 6148d2a7ac5dSMat Martineau &chan->conn_state)) { 6149d2a7ac5dSMat Martineau control->final = 0; 6150d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6151d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6152d2a7ac5dSMat Martineau } 6153d2a7ac5dSMat Martineau } 6154d2a7ac5dSMat Martineau 6155d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 6156d2a7ac5dSMat Martineau l2cap_send_ack(chan); 6157d2a7ac5dSMat Martineau break; 6158d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 6159d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6160d2a7ac5dSMat Martineau 6161d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 6162d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 6163d2a7ac5dSMat Martineau * when local busy is exited. 6164d2a7ac5dSMat Martineau */ 6165d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 6166d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 6167d2a7ac5dSMat Martineau control->txseq); 6168d2a7ac5dSMat Martineau break; 6169d2a7ac5dSMat Martineau } 6170d2a7ac5dSMat Martineau 6171d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 6172d2a7ac5dSMat Martineau * must be sent for each missing frame. The 6173d2a7ac5dSMat Martineau * current frame is stored for later use. 6174d2a7ac5dSMat Martineau */ 6175d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6176941247f9SPeter Senna Tschudin skb_in_use = true; 6177d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6178d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6179d2a7ac5dSMat Martineau 6180d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 6181d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 6182d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 6183d2a7ac5dSMat Martineau 6184d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 6185d2a7ac5dSMat Martineau break; 6186d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 6187d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6188d2a7ac5dSMat Martineau break; 6189d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 6190d2a7ac5dSMat Martineau break; 6191d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 6192d2a7ac5dSMat Martineau default: 61935e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6194d2a7ac5dSMat Martineau break; 6195d2a7ac5dSMat Martineau } 6196d2a7ac5dSMat Martineau break; 6197d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 6198d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6199d2a7ac5dSMat Martineau if (control->final) { 6200d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6201d2a7ac5dSMat Martineau 6202e6a3ee6eSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && 6203e6a3ee6eSMat Martineau !__chan_is_moving(chan)) { 6204d2a7ac5dSMat Martineau control->final = 0; 6205d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6206d2a7ac5dSMat Martineau } 6207d2a7ac5dSMat Martineau 6208d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6209d2a7ac5dSMat Martineau } else if (control->poll) { 6210d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 6211d2a7ac5dSMat Martineau } else { 6212d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6213d2a7ac5dSMat Martineau &chan->conn_state) && 6214d2a7ac5dSMat Martineau chan->unacked_frames) 6215d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6216d2a7ac5dSMat Martineau 6217d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6218d2a7ac5dSMat Martineau } 6219d2a7ac5dSMat Martineau break; 6220d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 6221d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6222d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6223d2a7ac5dSMat Martineau if (control && control->poll) { 6224d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 6225d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 6226d2a7ac5dSMat Martineau } 6227d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 6228d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 6229d2a7ac5dSMat Martineau break; 6230d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 6231d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 6232d2a7ac5dSMat Martineau break; 6233d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 6234d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 6235d2a7ac5dSMat Martineau break; 6236d2a7ac5dSMat Martineau default: 6237d2a7ac5dSMat Martineau break; 6238d2a7ac5dSMat Martineau } 6239d2a7ac5dSMat Martineau 6240d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 6241d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 6242d2a7ac5dSMat Martineau kfree_skb(skb); 6243d2a7ac5dSMat Martineau } 6244d2a7ac5dSMat Martineau 6245d2a7ac5dSMat Martineau return err; 6246d2a7ac5dSMat Martineau } 6247d2a7ac5dSMat Martineau 6248d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 6249d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 6250d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 6251d2a7ac5dSMat Martineau { 6252d2a7ac5dSMat Martineau int err = 0; 6253d2a7ac5dSMat Martineau u16 txseq = control->txseq; 6254941247f9SPeter Senna Tschudin bool skb_in_use = false; 6255d2a7ac5dSMat Martineau 6256d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 6257d2a7ac5dSMat Martineau event); 6258d2a7ac5dSMat Martineau 6259d2a7ac5dSMat Martineau switch (event) { 6260d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 6261d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 6262d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 6263d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 6264d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6265d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6266941247f9SPeter Senna Tschudin skb_in_use = true; 6267d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6268d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6269d2a7ac5dSMat Martineau 6270d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 6271d2a7ac5dSMat Martineau break; 6272d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 6273d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 6274d2a7ac5dSMat Martineau 6275d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6276d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6277941247f9SPeter Senna Tschudin skb_in_use = true; 6278d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6279d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6280d2a7ac5dSMat Martineau 6281d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 6282d2a7ac5dSMat Martineau if (err) 6283d2a7ac5dSMat Martineau break; 6284d2a7ac5dSMat Martineau 6285d2a7ac5dSMat Martineau break; 6286d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 6287d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 6288d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 6289d2a7ac5dSMat Martineau * the missing frames. 6290d2a7ac5dSMat Martineau */ 6291d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6292941247f9SPeter Senna Tschudin skb_in_use = true; 6293d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6294d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6295d2a7ac5dSMat Martineau 6296d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6297d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 6298d2a7ac5dSMat Martineau break; 6299d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 6300d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 6301d2a7ac5dSMat Martineau * some expected retransmitted frames are 6302d2a7ac5dSMat Martineau * missing. Request retransmission of missing 6303d2a7ac5dSMat Martineau * SREJ'd frames. 6304d2a7ac5dSMat Martineau */ 6305d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 6306941247f9SPeter Senna Tschudin skb_in_use = true; 6307d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6308d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6309d2a7ac5dSMat Martineau 6310d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6311d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 6312d2a7ac5dSMat Martineau break; 6313d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 6314d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 6315d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6316d2a7ac5dSMat Martineau break; 6317d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 6318d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 6319d2a7ac5dSMat Martineau * was already received. Ignore it completely. 6320d2a7ac5dSMat Martineau */ 6321d2a7ac5dSMat Martineau break; 6322d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 6323d2a7ac5dSMat Martineau break; 6324d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 6325d2a7ac5dSMat Martineau default: 63265e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6327d2a7ac5dSMat Martineau break; 6328d2a7ac5dSMat Martineau } 6329d2a7ac5dSMat Martineau break; 6330d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 6331d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6332d2a7ac5dSMat Martineau if (control->final) { 6333d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6334d2a7ac5dSMat Martineau 6335d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 6336d2a7ac5dSMat Martineau &chan->conn_state)) { 6337d2a7ac5dSMat Martineau control->final = 0; 6338d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6339d2a7ac5dSMat Martineau } 6340d2a7ac5dSMat Martineau 6341d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6342d2a7ac5dSMat Martineau } else if (control->poll) { 6343d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6344d2a7ac5dSMat Martineau &chan->conn_state) && 6345d2a7ac5dSMat Martineau chan->unacked_frames) { 6346d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6347d2a7ac5dSMat Martineau } 6348d2a7ac5dSMat Martineau 6349d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 6350d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6351d2a7ac5dSMat Martineau } else { 6352d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6353d2a7ac5dSMat Martineau &chan->conn_state) && 6354d2a7ac5dSMat Martineau chan->unacked_frames) 6355d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6356d2a7ac5dSMat Martineau 6357d2a7ac5dSMat Martineau l2cap_send_ack(chan); 6358d2a7ac5dSMat Martineau } 6359d2a7ac5dSMat Martineau break; 6360d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 6361d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6362d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6363d2a7ac5dSMat Martineau if (control->poll) { 6364d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6365d2a7ac5dSMat Martineau } else { 6366d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 6367d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 6368d2a7ac5dSMat Martineau rr_control.sframe = 1; 6369d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 6370d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 6371d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 6372d2a7ac5dSMat Martineau } 6373d2a7ac5dSMat Martineau 6374d2a7ac5dSMat Martineau break; 6375d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 6376d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 6377d2a7ac5dSMat Martineau break; 6378d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 6379d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 6380d2a7ac5dSMat Martineau break; 6381d2a7ac5dSMat Martineau } 6382d2a7ac5dSMat Martineau 6383d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 6384d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 6385d2a7ac5dSMat Martineau kfree_skb(skb); 6386d2a7ac5dSMat Martineau } 6387d2a7ac5dSMat Martineau 6388d2a7ac5dSMat Martineau return err; 6389d2a7ac5dSMat Martineau } 6390d2a7ac5dSMat Martineau 639132b32735SMat Martineau static int l2cap_finish_move(struct l2cap_chan *chan) 639232b32735SMat Martineau { 639332b32735SMat Martineau BT_DBG("chan %p", chan); 639432b32735SMat Martineau 639532b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 639632b32735SMat Martineau 639732b32735SMat Martineau if (chan->hs_hcon) 639832b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 639932b32735SMat Martineau else 640032b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 640132b32735SMat Martineau 640232b32735SMat Martineau return l2cap_resegment(chan); 640332b32735SMat Martineau } 640432b32735SMat Martineau 640532b32735SMat Martineau static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, 640632b32735SMat Martineau struct l2cap_ctrl *control, 640732b32735SMat Martineau struct sk_buff *skb, u8 event) 640832b32735SMat Martineau { 640932b32735SMat Martineau int err; 641032b32735SMat Martineau 641132b32735SMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 641232b32735SMat Martineau event); 641332b32735SMat Martineau 641432b32735SMat Martineau if (!control->poll) 641532b32735SMat Martineau return -EPROTO; 641632b32735SMat Martineau 641732b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 641832b32735SMat Martineau 641932b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 642032b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 642132b32735SMat Martineau else 642232b32735SMat Martineau chan->tx_send_head = NULL; 642332b32735SMat Martineau 642432b32735SMat Martineau /* Rewind next_tx_seq to the point expected 642532b32735SMat Martineau * by the receiver. 642632b32735SMat Martineau */ 642732b32735SMat Martineau chan->next_tx_seq = control->reqseq; 642832b32735SMat Martineau chan->unacked_frames = 0; 642932b32735SMat Martineau 643032b32735SMat Martineau err = l2cap_finish_move(chan); 643132b32735SMat Martineau if (err) 643232b32735SMat Martineau return err; 643332b32735SMat Martineau 643432b32735SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 643532b32735SMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 643632b32735SMat Martineau 643732b32735SMat Martineau if (event == L2CAP_EV_RECV_IFRAME) 643832b32735SMat Martineau return -EPROTO; 643932b32735SMat Martineau 644032b32735SMat Martineau return l2cap_rx_state_recv(chan, control, NULL, event); 644132b32735SMat Martineau } 644232b32735SMat Martineau 644332b32735SMat Martineau static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, 644432b32735SMat Martineau struct l2cap_ctrl *control, 644532b32735SMat Martineau struct sk_buff *skb, u8 event) 644632b32735SMat Martineau { 644732b32735SMat Martineau int err; 644832b32735SMat Martineau 644932b32735SMat Martineau if (!control->final) 645032b32735SMat Martineau return -EPROTO; 645132b32735SMat Martineau 645232b32735SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 645332b32735SMat Martineau 645432b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 645532b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 645632b32735SMat Martineau 645732b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 645832b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 645932b32735SMat Martineau else 646032b32735SMat Martineau chan->tx_send_head = NULL; 646132b32735SMat Martineau 646232b32735SMat Martineau /* Rewind next_tx_seq to the point expected 646332b32735SMat Martineau * by the receiver. 646432b32735SMat Martineau */ 646532b32735SMat Martineau chan->next_tx_seq = control->reqseq; 646632b32735SMat Martineau chan->unacked_frames = 0; 646732b32735SMat Martineau 646832b32735SMat Martineau if (chan->hs_hcon) 646932b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 647032b32735SMat Martineau else 647132b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 647232b32735SMat Martineau 647332b32735SMat Martineau err = l2cap_resegment(chan); 647432b32735SMat Martineau 647532b32735SMat Martineau if (!err) 647632b32735SMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 647732b32735SMat Martineau 647832b32735SMat Martineau return err; 647932b32735SMat Martineau } 648032b32735SMat Martineau 6481d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 6482d2a7ac5dSMat Martineau { 6483d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 6484d2a7ac5dSMat Martineau u16 unacked; 6485d2a7ac5dSMat Martineau 6486d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 6487d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 6488d2a7ac5dSMat Martineau } 6489d2a7ac5dSMat Martineau 6490cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6491cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 64920a708f8fSGustavo F. Padovan { 6493d2a7ac5dSMat Martineau int err = 0; 6494d2a7ac5dSMat Martineau 6495d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 6496d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 6497d2a7ac5dSMat Martineau 6498d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 6499d2a7ac5dSMat Martineau switch (chan->rx_state) { 6500d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 6501d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 6502d2a7ac5dSMat Martineau break; 6503d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 6504d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 6505d2a7ac5dSMat Martineau event); 6506d2a7ac5dSMat Martineau break; 650732b32735SMat Martineau case L2CAP_RX_STATE_WAIT_P: 650832b32735SMat Martineau err = l2cap_rx_state_wait_p(chan, control, skb, event); 650932b32735SMat Martineau break; 651032b32735SMat Martineau case L2CAP_RX_STATE_WAIT_F: 651132b32735SMat Martineau err = l2cap_rx_state_wait_f(chan, control, skb, event); 651232b32735SMat Martineau break; 6513d2a7ac5dSMat Martineau default: 6514d2a7ac5dSMat Martineau /* shut it down */ 6515d2a7ac5dSMat Martineau break; 6516d2a7ac5dSMat Martineau } 6517d2a7ac5dSMat Martineau } else { 6518d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 6519d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 6520d2a7ac5dSMat Martineau chan->expected_ack_seq); 65215e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6522d2a7ac5dSMat Martineau } 6523d2a7ac5dSMat Martineau 6524d2a7ac5dSMat Martineau return err; 6525cec8ab6eSMat Martineau } 6526cec8ab6eSMat Martineau 6527cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6528cec8ab6eSMat Martineau struct sk_buff *skb) 6529cec8ab6eSMat Martineau { 65304b51dae9SMat Martineau int err = 0; 65314b51dae9SMat Martineau 65324b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 65334b51dae9SMat Martineau chan->rx_state); 65344b51dae9SMat Martineau 65354b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 65364b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 65374b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 65384b51dae9SMat Martineau 65394b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 65404b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 65414b51dae9SMat Martineau 65424b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 65434b51dae9SMat Martineau 65444b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 65454b51dae9SMat Martineau } else { 65464b51dae9SMat Martineau if (chan->sdu) { 65474b51dae9SMat Martineau kfree_skb(chan->sdu); 65484b51dae9SMat Martineau chan->sdu = NULL; 65494b51dae9SMat Martineau } 65504b51dae9SMat Martineau chan->sdu_last_frag = NULL; 65514b51dae9SMat Martineau chan->sdu_len = 0; 65524b51dae9SMat Martineau 65534b51dae9SMat Martineau if (skb) { 65544b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 65554b51dae9SMat Martineau kfree_skb(skb); 65564b51dae9SMat Martineau } 65574b51dae9SMat Martineau } 65584b51dae9SMat Martineau 65594b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 65604b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 65614b51dae9SMat Martineau 65624b51dae9SMat Martineau return err; 6563cec8ab6eSMat Martineau } 6564cec8ab6eSMat Martineau 6565cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6566cec8ab6eSMat Martineau { 6567cec8ab6eSMat Martineau struct l2cap_ctrl *control = &bt_cb(skb)->control; 6568cec8ab6eSMat Martineau u16 len; 6569cec8ab6eSMat Martineau u8 event; 65700a708f8fSGustavo F. Padovan 6571b76bbd66SMat Martineau __unpack_control(chan, skb); 6572b76bbd66SMat Martineau 65730a708f8fSGustavo F. Padovan len = skb->len; 65740a708f8fSGustavo F. Padovan 65750a708f8fSGustavo F. Padovan /* 65760a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 65770a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 6578cec8ab6eSMat Martineau * procedures and ask for retransmission. 65790a708f8fSGustavo F. Padovan */ 658047d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 65810a708f8fSGustavo F. Padovan goto drop; 65820a708f8fSGustavo F. Padovan 6583cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 658403a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 65850a708f8fSGustavo F. Padovan 658647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 658703a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 65880a708f8fSGustavo F. Padovan 658947d1ec61SGustavo F. Padovan if (len > chan->mps) { 65905e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 65910a708f8fSGustavo F. Padovan goto drop; 65920a708f8fSGustavo F. Padovan } 65930a708f8fSGustavo F. Padovan 6594cec8ab6eSMat Martineau if (!control->sframe) { 6595cec8ab6eSMat Martineau int err; 65960a708f8fSGustavo F. Padovan 6597cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 6598cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 6599cec8ab6eSMat Martineau control->txseq); 6600836be934SAndrei Emeltchenko 6601cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 6602cec8ab6eSMat Martineau * valid in TX WAIT_F 6603cec8ab6eSMat Martineau */ 6604cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 66050a708f8fSGustavo F. Padovan goto drop; 66060a708f8fSGustavo F. Padovan 6607cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 6608cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 6609cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 66100a708f8fSGustavo F. Padovan } else { 6611cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 6612cec8ab6eSMat Martineau } 6613cec8ab6eSMat Martineau 6614cec8ab6eSMat Martineau if (err) 66155e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6616cec8ab6eSMat Martineau } else { 6617cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 6618cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 6619cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 6620cec8ab6eSMat Martineau }; 6621cec8ab6eSMat Martineau 6622cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 6623cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 6624cec8ab6eSMat Martineau goto drop; 6625cec8ab6eSMat Martineau 6626cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 6627cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 6628cec8ab6eSMat Martineau control->super); 6629cec8ab6eSMat Martineau 66300a708f8fSGustavo F. Padovan if (len != 0) { 66311bb166e6SAndrei Emeltchenko BT_ERR("Trailing bytes: %d in sframe", len); 66325e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 66330a708f8fSGustavo F. Padovan goto drop; 66340a708f8fSGustavo F. Padovan } 66350a708f8fSGustavo F. Padovan 6636cec8ab6eSMat Martineau /* Validate F and P bits */ 6637cec8ab6eSMat Martineau if (control->final && (control->poll || 6638cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 6639cec8ab6eSMat Martineau goto drop; 6640cec8ab6eSMat Martineau 6641cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 6642cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 66435e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 66440a708f8fSGustavo F. Padovan } 66450a708f8fSGustavo F. Padovan 66460a708f8fSGustavo F. Padovan return 0; 66470a708f8fSGustavo F. Padovan 66480a708f8fSGustavo F. Padovan drop: 66490a708f8fSGustavo F. Padovan kfree_skb(skb); 66500a708f8fSGustavo F. Padovan return 0; 66510a708f8fSGustavo F. Padovan } 66520a708f8fSGustavo F. Padovan 6653b1c325c2SJohan Hedberg static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) 6654b1c325c2SJohan Hedberg { 6655b1c325c2SJohan Hedberg struct l2cap_conn *conn = chan->conn; 6656b1c325c2SJohan Hedberg struct l2cap_le_credits pkt; 6657b1c325c2SJohan Hedberg u16 return_credits; 6658b1c325c2SJohan Hedberg 6659b1c325c2SJohan Hedberg /* We return more credits to the sender only after the amount of 6660b1c325c2SJohan Hedberg * credits falls below half of the initial amount. 6661b1c325c2SJohan Hedberg */ 6662f15b8ecfSJohan Hedberg if (chan->rx_credits >= (le_max_credits + 1) / 2) 6663b1c325c2SJohan Hedberg return; 6664b1c325c2SJohan Hedberg 6665f15b8ecfSJohan Hedberg return_credits = le_max_credits - chan->rx_credits; 6666b1c325c2SJohan Hedberg 6667b1c325c2SJohan Hedberg BT_DBG("chan %p returning %u credits to sender", chan, return_credits); 6668b1c325c2SJohan Hedberg 6669b1c325c2SJohan Hedberg chan->rx_credits += return_credits; 6670b1c325c2SJohan Hedberg 6671b1c325c2SJohan Hedberg pkt.cid = cpu_to_le16(chan->scid); 6672b1c325c2SJohan Hedberg pkt.credits = cpu_to_le16(return_credits); 6673b1c325c2SJohan Hedberg 6674b1c325c2SJohan Hedberg chan->ident = l2cap_get_ident(conn); 6675b1c325c2SJohan Hedberg 6676b1c325c2SJohan Hedberg l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); 6677b1c325c2SJohan Hedberg } 6678b1c325c2SJohan Hedberg 6679fad5fc89SJohan Hedberg static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6680fad5fc89SJohan Hedberg { 6681aac23bf6SJohan Hedberg int err; 6682fad5fc89SJohan Hedberg 6683aac23bf6SJohan Hedberg if (!chan->rx_credits) { 6684aac23bf6SJohan Hedberg BT_ERR("No credits to receive LE L2CAP data"); 6685dfd9774cSJohan Hedberg l2cap_send_disconn_req(chan, ECONNRESET); 6686fad5fc89SJohan Hedberg return -ENOBUFS; 6687aac23bf6SJohan Hedberg } 6688aac23bf6SJohan Hedberg 6689aac23bf6SJohan Hedberg if (chan->imtu < skb->len) { 6690aac23bf6SJohan Hedberg BT_ERR("Too big LE L2CAP PDU"); 6691aac23bf6SJohan Hedberg return -ENOBUFS; 6692aac23bf6SJohan Hedberg } 6693fad5fc89SJohan Hedberg 6694fad5fc89SJohan Hedberg chan->rx_credits--; 6695fad5fc89SJohan Hedberg BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); 6696fad5fc89SJohan Hedberg 6697fad5fc89SJohan Hedberg l2cap_chan_le_send_credits(chan); 6698fad5fc89SJohan Hedberg 6699aac23bf6SJohan Hedberg err = 0; 6700aac23bf6SJohan Hedberg 6701aac23bf6SJohan Hedberg if (!chan->sdu) { 6702aac23bf6SJohan Hedberg u16 sdu_len; 6703aac23bf6SJohan Hedberg 6704aac23bf6SJohan Hedberg sdu_len = get_unaligned_le16(skb->data); 6705aac23bf6SJohan Hedberg skb_pull(skb, L2CAP_SDULEN_SIZE); 6706aac23bf6SJohan Hedberg 6707aac23bf6SJohan Hedberg BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", 6708aac23bf6SJohan Hedberg sdu_len, skb->len, chan->imtu); 6709aac23bf6SJohan Hedberg 6710aac23bf6SJohan Hedberg if (sdu_len > chan->imtu) { 6711aac23bf6SJohan Hedberg BT_ERR("Too big LE L2CAP SDU length received"); 6712aac23bf6SJohan Hedberg err = -EMSGSIZE; 6713aac23bf6SJohan Hedberg goto failed; 6714aac23bf6SJohan Hedberg } 6715aac23bf6SJohan Hedberg 6716aac23bf6SJohan Hedberg if (skb->len > sdu_len) { 6717aac23bf6SJohan Hedberg BT_ERR("Too much LE L2CAP data received"); 6718aac23bf6SJohan Hedberg err = -EINVAL; 6719aac23bf6SJohan Hedberg goto failed; 6720aac23bf6SJohan Hedberg } 6721aac23bf6SJohan Hedberg 6722aac23bf6SJohan Hedberg if (skb->len == sdu_len) 6723fad5fc89SJohan Hedberg return chan->ops->recv(chan, skb); 6724aac23bf6SJohan Hedberg 6725aac23bf6SJohan Hedberg chan->sdu = skb; 6726aac23bf6SJohan Hedberg chan->sdu_len = sdu_len; 6727aac23bf6SJohan Hedberg chan->sdu_last_frag = skb; 6728aac23bf6SJohan Hedberg 6729aac23bf6SJohan Hedberg return 0; 6730aac23bf6SJohan Hedberg } 6731aac23bf6SJohan Hedberg 6732aac23bf6SJohan Hedberg BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", 6733aac23bf6SJohan Hedberg chan->sdu->len, skb->len, chan->sdu_len); 6734aac23bf6SJohan Hedberg 6735aac23bf6SJohan Hedberg if (chan->sdu->len + skb->len > chan->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 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); 6742aac23bf6SJohan Hedberg skb = NULL; 6743aac23bf6SJohan Hedberg 6744aac23bf6SJohan Hedberg if (chan->sdu->len == chan->sdu_len) { 6745aac23bf6SJohan Hedberg err = chan->ops->recv(chan, chan->sdu); 6746aac23bf6SJohan Hedberg if (!err) { 6747aac23bf6SJohan Hedberg chan->sdu = NULL; 6748aac23bf6SJohan Hedberg chan->sdu_last_frag = NULL; 6749aac23bf6SJohan Hedberg chan->sdu_len = 0; 6750aac23bf6SJohan Hedberg } 6751aac23bf6SJohan Hedberg } 6752aac23bf6SJohan Hedberg 6753aac23bf6SJohan Hedberg failed: 6754aac23bf6SJohan Hedberg if (err) { 6755aac23bf6SJohan Hedberg kfree_skb(skb); 6756aac23bf6SJohan Hedberg kfree_skb(chan->sdu); 6757aac23bf6SJohan Hedberg chan->sdu = NULL; 6758aac23bf6SJohan Hedberg chan->sdu_last_frag = NULL; 6759aac23bf6SJohan Hedberg chan->sdu_len = 0; 6760aac23bf6SJohan Hedberg } 6761aac23bf6SJohan Hedberg 6762aac23bf6SJohan Hedberg /* We can't return an error here since we took care of the skb 6763aac23bf6SJohan Hedberg * freeing internally. An error return would cause the caller to 6764aac23bf6SJohan Hedberg * do a double-free of the skb. 6765aac23bf6SJohan Hedberg */ 6766aac23bf6SJohan Hedberg return 0; 6767fad5fc89SJohan Hedberg } 6768fad5fc89SJohan Hedberg 676913ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 677013ca56e0SAndrei Emeltchenko struct sk_buff *skb) 67710a708f8fSGustavo F. Padovan { 677248454079SGustavo F. Padovan struct l2cap_chan *chan; 67730a708f8fSGustavo F. Padovan 6774baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 677548454079SGustavo F. Padovan if (!chan) { 677697e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 677797e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 677897e8e89dSAndrei Emeltchenko if (!chan) { 677997e8e89dSAndrei Emeltchenko kfree_skb(skb); 678013ca56e0SAndrei Emeltchenko return; 678197e8e89dSAndrei Emeltchenko } 678297e8e89dSAndrei Emeltchenko 678397e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 678497e8e89dSAndrei Emeltchenko } else { 67850a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 67866be36555SAndrei Emeltchenko /* Drop packet and return */ 67873379013bSDan Carpenter kfree_skb(skb); 678813ca56e0SAndrei Emeltchenko return; 67890a708f8fSGustavo F. Padovan } 679097e8e89dSAndrei Emeltchenko } 67910a708f8fSGustavo F. Padovan 679249208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 67930a708f8fSGustavo F. Padovan 679489bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 67950a708f8fSGustavo F. Padovan goto drop; 67960a708f8fSGustavo F. Padovan 67970c1bc5c6SGustavo F. Padovan switch (chan->mode) { 679838319713SJohan Hedberg case L2CAP_MODE_LE_FLOWCTL: 6799fad5fc89SJohan Hedberg if (l2cap_le_data_rcv(chan, skb) < 0) 6800fad5fc89SJohan Hedberg goto drop; 6801fad5fc89SJohan Hedberg 6802fad5fc89SJohan Hedberg goto done; 6803fad5fc89SJohan Hedberg 68040a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 68050a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 68060a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 68070a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 68080a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 68090a708f8fSGustavo F. Padovan 68102c96e03dSSzymon Janc if (chan->imtu < skb->len) { 68112c96e03dSSzymon Janc BT_ERR("Dropping L2CAP data: receive buffer overflow"); 68120a708f8fSGustavo F. Padovan goto drop; 68132c96e03dSSzymon Janc } 68140a708f8fSGustavo F. Padovan 681580b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 68160a708f8fSGustavo F. Padovan goto done; 68170a708f8fSGustavo F. Padovan break; 68180a708f8fSGustavo F. Padovan 68190a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 68200a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6821cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 68220a708f8fSGustavo F. Padovan goto done; 68230a708f8fSGustavo F. Padovan 68240a708f8fSGustavo F. Padovan default: 68250c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 68260a708f8fSGustavo F. Padovan break; 68270a708f8fSGustavo F. Padovan } 68280a708f8fSGustavo F. Padovan 68290a708f8fSGustavo F. Padovan drop: 68300a708f8fSGustavo F. Padovan kfree_skb(skb); 68310a708f8fSGustavo F. Padovan 68320a708f8fSGustavo F. Padovan done: 68336be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 68340a708f8fSGustavo F. Padovan } 68350a708f8fSGustavo F. Padovan 683684104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 683784104b24SAndrei Emeltchenko struct sk_buff *skb) 68380a708f8fSGustavo F. Padovan { 6839ae4fd2d3SMarcel Holtmann struct hci_conn *hcon = conn->hcon; 684023691d75SGustavo F. Padovan struct l2cap_chan *chan; 68410a708f8fSGustavo F. Padovan 6842ae4fd2d3SMarcel Holtmann if (hcon->type != ACL_LINK) 6843ae4fd2d3SMarcel Holtmann goto drop; 6844ae4fd2d3SMarcel Holtmann 6845bf20fd4eSJohan Hedberg chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, 6846bf20fd4eSJohan Hedberg ACL_LINK); 684723691d75SGustavo F. Padovan if (!chan) 68480a708f8fSGustavo F. Padovan goto drop; 68490a708f8fSGustavo F. Padovan 68505b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 68510a708f8fSGustavo F. Padovan 685289bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 68530a708f8fSGustavo F. Padovan goto drop; 68540a708f8fSGustavo F. Padovan 6855e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 68560a708f8fSGustavo F. Padovan goto drop; 68570a708f8fSGustavo F. Padovan 68582edf870dSMarcel Holtmann /* Store remote BD_ADDR and PSM for msg_name */ 685906ae3314SMarcel Holtmann bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); 68602edf870dSMarcel Holtmann bt_cb(skb)->psm = psm; 68612edf870dSMarcel Holtmann 686280b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 686384104b24SAndrei Emeltchenko return; 68640a708f8fSGustavo F. Padovan 68650a708f8fSGustavo F. Padovan drop: 68660a708f8fSGustavo F. Padovan kfree_skb(skb); 68670a708f8fSGustavo F. Padovan } 68680a708f8fSGustavo F. Padovan 686972f78356SMarcel Holtmann static void l2cap_att_channel(struct l2cap_conn *conn, 6870d9b88702SAndrei Emeltchenko struct sk_buff *skb) 68719f69bda6SGustavo F. Padovan { 6872b99707d7SMarcel Holtmann struct hci_conn *hcon = conn->hcon; 687323691d75SGustavo F. Padovan struct l2cap_chan *chan; 68749f69bda6SGustavo F. Padovan 6875b99707d7SMarcel Holtmann if (hcon->type != LE_LINK) 6876b99707d7SMarcel Holtmann goto drop; 6877b99707d7SMarcel Holtmann 6878af1c0134SJohan Hedberg chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, 687906ae3314SMarcel Holtmann &hcon->src, &hcon->dst); 688023691d75SGustavo F. Padovan if (!chan) 68819f69bda6SGustavo F. Padovan goto drop; 68829f69bda6SGustavo F. Padovan 68835b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 68849f69bda6SGustavo F. Padovan 6885e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 68869f69bda6SGustavo F. Padovan goto drop; 68879f69bda6SGustavo F. Padovan 688880b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 68896810fca7SAndrei Emeltchenko return; 68909f69bda6SGustavo F. Padovan 68919f69bda6SGustavo F. Padovan drop: 68929f69bda6SGustavo F. Padovan kfree_skb(skb); 68939f69bda6SGustavo F. Padovan } 68949f69bda6SGustavo F. Padovan 68950a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 68960a708f8fSGustavo F. Padovan { 68970a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 689861a939c6SJohan Hedberg struct hci_conn *hcon = conn->hcon; 68990a708f8fSGustavo F. Padovan u16 cid, len; 69000a708f8fSGustavo F. Padovan __le16 psm; 69010a708f8fSGustavo F. Padovan 690261a939c6SJohan Hedberg if (hcon->state != BT_CONNECTED) { 690361a939c6SJohan Hedberg BT_DBG("queueing pending rx skb"); 690461a939c6SJohan Hedberg skb_queue_tail(&conn->pending_rx, skb); 690561a939c6SJohan Hedberg return; 690661a939c6SJohan Hedberg } 690761a939c6SJohan Hedberg 69080a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 69090a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 69100a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 69110a708f8fSGustavo F. Padovan 69120a708f8fSGustavo F. Padovan if (len != skb->len) { 69130a708f8fSGustavo F. Padovan kfree_skb(skb); 69140a708f8fSGustavo F. Padovan return; 69150a708f8fSGustavo F. Padovan } 69160a708f8fSGustavo F. Padovan 6917e493150eSJohan Hedberg if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, 6918e493150eSJohan Hedberg bdaddr_type(hcon, hcon->dst_type))) { 6919e493150eSJohan Hedberg kfree_skb(skb); 6920e493150eSJohan Hedberg return; 6921e493150eSJohan Hedberg } 6922e493150eSJohan Hedberg 69230a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 69240a708f8fSGustavo F. Padovan 69250a708f8fSGustavo F. Padovan switch (cid) { 69260a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 69270a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 69280a708f8fSGustavo F. Padovan break; 69290a708f8fSGustavo F. Padovan 69300a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 6931097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 69320181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 69330a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 69340a708f8fSGustavo F. Padovan break; 69350a708f8fSGustavo F. Padovan 6936073d1cf3SJohan Hedberg case L2CAP_CID_ATT: 693772f78356SMarcel Holtmann l2cap_att_channel(conn, skb); 69389f69bda6SGustavo F. Padovan break; 69399f69bda6SGustavo F. Padovan 6940a2877629SMarcel Holtmann case L2CAP_CID_LE_SIGNALING: 6941a2877629SMarcel Holtmann l2cap_le_sig_channel(conn, skb); 6942a2877629SMarcel Holtmann break; 6943a2877629SMarcel Holtmann 6944b501d6a1SAnderson Briglia case L2CAP_CID_SMP: 6945b501d6a1SAnderson Briglia if (smp_sig_channel(conn, skb)) 6946b501d6a1SAnderson Briglia l2cap_conn_del(conn->hcon, EACCES); 6947b501d6a1SAnderson Briglia break; 6948b501d6a1SAnderson Briglia 69490a708f8fSGustavo F. Padovan default: 69500a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 69510a708f8fSGustavo F. Padovan break; 69520a708f8fSGustavo F. Padovan } 69530a708f8fSGustavo F. Padovan } 69540a708f8fSGustavo F. Padovan 695561a939c6SJohan Hedberg static void process_pending_rx(struct work_struct *work) 695661a939c6SJohan Hedberg { 695761a939c6SJohan Hedberg struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 695861a939c6SJohan Hedberg pending_rx_work); 695961a939c6SJohan Hedberg struct sk_buff *skb; 696061a939c6SJohan Hedberg 696161a939c6SJohan Hedberg BT_DBG(""); 696261a939c6SJohan Hedberg 696361a939c6SJohan Hedberg while ((skb = skb_dequeue(&conn->pending_rx))) 696461a939c6SJohan Hedberg l2cap_recv_frame(conn, skb); 696561a939c6SJohan Hedberg } 696661a939c6SJohan Hedberg 6967162b49e7SJohan Hedberg static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) 6968162b49e7SJohan Hedberg { 6969162b49e7SJohan Hedberg struct l2cap_conn *conn = hcon->l2cap_data; 6970162b49e7SJohan Hedberg struct hci_chan *hchan; 6971162b49e7SJohan Hedberg 6972162b49e7SJohan Hedberg if (conn) 6973162b49e7SJohan Hedberg return conn; 6974162b49e7SJohan Hedberg 6975162b49e7SJohan Hedberg hchan = hci_chan_create(hcon); 6976162b49e7SJohan Hedberg if (!hchan) 6977162b49e7SJohan Hedberg return NULL; 6978162b49e7SJohan Hedberg 6979162b49e7SJohan Hedberg conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); 6980162b49e7SJohan Hedberg if (!conn) { 6981162b49e7SJohan Hedberg hci_chan_del(hchan); 6982162b49e7SJohan Hedberg return NULL; 6983162b49e7SJohan Hedberg } 6984162b49e7SJohan Hedberg 6985162b49e7SJohan Hedberg kref_init(&conn->ref); 6986162b49e7SJohan Hedberg hcon->l2cap_data = conn; 6987162b49e7SJohan Hedberg conn->hcon = hcon; 6988162b49e7SJohan Hedberg hci_conn_get(conn->hcon); 6989162b49e7SJohan Hedberg conn->hchan = hchan; 6990162b49e7SJohan Hedberg 6991162b49e7SJohan Hedberg BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 6992162b49e7SJohan Hedberg 6993162b49e7SJohan Hedberg switch (hcon->type) { 6994162b49e7SJohan Hedberg case LE_LINK: 6995162b49e7SJohan Hedberg if (hcon->hdev->le_mtu) { 6996162b49e7SJohan Hedberg conn->mtu = hcon->hdev->le_mtu; 6997162b49e7SJohan Hedberg break; 6998162b49e7SJohan Hedberg } 6999162b49e7SJohan Hedberg /* fall through */ 7000162b49e7SJohan Hedberg default: 7001162b49e7SJohan Hedberg conn->mtu = hcon->hdev->acl_mtu; 7002162b49e7SJohan Hedberg break; 7003162b49e7SJohan Hedberg } 7004162b49e7SJohan Hedberg 7005162b49e7SJohan Hedberg conn->feat_mask = 0; 7006162b49e7SJohan Hedberg 7007162b49e7SJohan Hedberg if (hcon->type == ACL_LINK) 7008162b49e7SJohan Hedberg conn->hs_enabled = test_bit(HCI_HS_ENABLED, 7009162b49e7SJohan Hedberg &hcon->hdev->dev_flags); 7010162b49e7SJohan Hedberg 7011162b49e7SJohan Hedberg spin_lock_init(&conn->lock); 7012162b49e7SJohan Hedberg mutex_init(&conn->chan_lock); 7013162b49e7SJohan Hedberg 7014162b49e7SJohan Hedberg INIT_LIST_HEAD(&conn->chan_l); 7015162b49e7SJohan Hedberg INIT_LIST_HEAD(&conn->users); 7016162b49e7SJohan Hedberg 7017162b49e7SJohan Hedberg if (hcon->type == LE_LINK) 7018162b49e7SJohan Hedberg INIT_DELAYED_WORK(&conn->security_timer, security_timeout); 7019162b49e7SJohan Hedberg else 7020162b49e7SJohan Hedberg INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 7021162b49e7SJohan Hedberg 702261a939c6SJohan Hedberg skb_queue_head_init(&conn->pending_rx); 702361a939c6SJohan Hedberg INIT_WORK(&conn->pending_rx_work, process_pending_rx); 702461a939c6SJohan Hedberg 7025162b49e7SJohan Hedberg conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 7026162b49e7SJohan Hedberg 7027162b49e7SJohan Hedberg return conn; 7028162b49e7SJohan Hedberg } 7029162b49e7SJohan Hedberg 7030162b49e7SJohan Hedberg static bool is_valid_psm(u16 psm, u8 dst_type) { 7031162b49e7SJohan Hedberg if (!psm) 7032162b49e7SJohan Hedberg return false; 7033162b49e7SJohan Hedberg 7034162b49e7SJohan Hedberg if (bdaddr_type_is_le(dst_type)) 7035162b49e7SJohan Hedberg return (psm <= 0x00ff); 7036162b49e7SJohan Hedberg 7037162b49e7SJohan Hedberg /* PSM must be odd and lsb of upper byte must be 0 */ 7038162b49e7SJohan Hedberg return ((psm & 0x0101) == 0x0001); 7039162b49e7SJohan Hedberg } 7040162b49e7SJohan Hedberg 7041162b49e7SJohan Hedberg int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 7042162b49e7SJohan Hedberg bdaddr_t *dst, u8 dst_type) 7043162b49e7SJohan Hedberg { 7044162b49e7SJohan Hedberg struct l2cap_conn *conn; 7045162b49e7SJohan Hedberg struct hci_conn *hcon; 7046162b49e7SJohan Hedberg struct hci_dev *hdev; 7047162b49e7SJohan Hedberg __u8 auth_type; 7048162b49e7SJohan Hedberg int err; 7049162b49e7SJohan Hedberg 7050162b49e7SJohan Hedberg BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, 7051162b49e7SJohan Hedberg dst_type, __le16_to_cpu(psm)); 7052162b49e7SJohan Hedberg 7053162b49e7SJohan Hedberg hdev = hci_get_route(dst, &chan->src); 7054162b49e7SJohan Hedberg if (!hdev) 7055162b49e7SJohan Hedberg return -EHOSTUNREACH; 7056162b49e7SJohan Hedberg 7057162b49e7SJohan Hedberg hci_dev_lock(hdev); 7058162b49e7SJohan Hedberg 7059162b49e7SJohan Hedberg l2cap_chan_lock(chan); 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: 7089162b49e7SJohan Hedberg err = -ENOTSUPP; 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 7123162b49e7SJohan Hedberg auth_type = l2cap_get_auth_type(chan); 7124162b49e7SJohan Hedberg 71256f77d8c7SAndre Guedes if (bdaddr_type_is_le(dst_type)) { 71266f77d8c7SAndre Guedes /* Convert from L2CAP channel address type to HCI address type 71276f77d8c7SAndre Guedes */ 71286f77d8c7SAndre Guedes if (dst_type == BDADDR_LE_PUBLIC) 71296f77d8c7SAndre Guedes dst_type = ADDR_LE_DEV_PUBLIC; 71306f77d8c7SAndre Guedes else 71316f77d8c7SAndre Guedes dst_type = ADDR_LE_DEV_RANDOM; 71326f77d8c7SAndre Guedes 713304a6c589SAndre Guedes hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level, 713404a6c589SAndre Guedes auth_type); 71356f77d8c7SAndre Guedes } else { 713604a6c589SAndre Guedes hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); 71376f77d8c7SAndre Guedes } 7138162b49e7SJohan Hedberg 7139162b49e7SJohan Hedberg if (IS_ERR(hcon)) { 7140162b49e7SJohan Hedberg err = PTR_ERR(hcon); 7141162b49e7SJohan Hedberg goto done; 7142162b49e7SJohan Hedberg } 7143162b49e7SJohan Hedberg 7144162b49e7SJohan Hedberg conn = l2cap_conn_add(hcon); 7145162b49e7SJohan Hedberg if (!conn) { 7146162b49e7SJohan Hedberg hci_conn_drop(hcon); 7147162b49e7SJohan Hedberg err = -ENOMEM; 7148162b49e7SJohan Hedberg goto done; 7149162b49e7SJohan Hedberg } 7150162b49e7SJohan Hedberg 7151162b49e7SJohan Hedberg if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { 7152162b49e7SJohan Hedberg hci_conn_drop(hcon); 7153162b49e7SJohan Hedberg err = -EBUSY; 7154162b49e7SJohan Hedberg goto done; 7155162b49e7SJohan Hedberg } 7156162b49e7SJohan Hedberg 7157162b49e7SJohan Hedberg /* Update source addr of the socket */ 7158162b49e7SJohan Hedberg bacpy(&chan->src, &hcon->src); 7159162b49e7SJohan Hedberg chan->src_type = bdaddr_type(hcon, hcon->src_type); 7160162b49e7SJohan Hedberg 7161162b49e7SJohan Hedberg l2cap_chan_unlock(chan); 7162162b49e7SJohan Hedberg l2cap_chan_add(conn, chan); 7163162b49e7SJohan Hedberg l2cap_chan_lock(chan); 7164162b49e7SJohan Hedberg 7165162b49e7SJohan Hedberg /* l2cap_chan_add takes its own ref so we can drop this one */ 7166162b49e7SJohan Hedberg hci_conn_drop(hcon); 7167162b49e7SJohan Hedberg 7168162b49e7SJohan Hedberg l2cap_state_change(chan, BT_CONNECT); 7169162b49e7SJohan Hedberg __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); 7170162b49e7SJohan Hedberg 717161202e4dSJohan Hedberg /* Release chan->sport so that it can be reused by other 717261202e4dSJohan Hedberg * sockets (as it's only used for listening sockets). 717361202e4dSJohan Hedberg */ 717461202e4dSJohan Hedberg write_lock(&chan_list_lock); 717561202e4dSJohan Hedberg chan->sport = 0; 717661202e4dSJohan Hedberg write_unlock(&chan_list_lock); 717761202e4dSJohan Hedberg 7178162b49e7SJohan Hedberg if (hcon->state == BT_CONNECTED) { 7179162b49e7SJohan Hedberg if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 7180162b49e7SJohan Hedberg __clear_chan_timer(chan); 7181162b49e7SJohan Hedberg if (l2cap_chan_check_security(chan)) 7182162b49e7SJohan Hedberg l2cap_state_change(chan, BT_CONNECTED); 7183162b49e7SJohan Hedberg } else 7184162b49e7SJohan Hedberg l2cap_do_start(chan); 7185162b49e7SJohan Hedberg } 7186162b49e7SJohan Hedberg 7187162b49e7SJohan Hedberg err = 0; 7188162b49e7SJohan Hedberg 7189162b49e7SJohan Hedberg done: 7190162b49e7SJohan Hedberg l2cap_chan_unlock(chan); 7191162b49e7SJohan Hedberg hci_dev_unlock(hdev); 7192162b49e7SJohan Hedberg hci_dev_put(hdev); 7193162b49e7SJohan Hedberg return err; 7194162b49e7SJohan Hedberg } 71956b8d4a6aSJukka Rissanen EXPORT_SYMBOL_GPL(l2cap_chan_connect); 7196162b49e7SJohan Hedberg 71970a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 71980a708f8fSGustavo F. Padovan 7199686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 72000a708f8fSGustavo F. Padovan { 72010a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 720223691d75SGustavo F. Padovan struct l2cap_chan *c; 72030a708f8fSGustavo F. Padovan 72046ed93dc6SAndrei Emeltchenko BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 72050a708f8fSGustavo F. Padovan 72060a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 720723691d75SGustavo F. Padovan read_lock(&chan_list_lock); 720823691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 720989bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 72100a708f8fSGustavo F. Padovan continue; 72110a708f8fSGustavo F. Padovan 72127eafc59eSMarcel Holtmann if (!bacmp(&c->src, &hdev->bdaddr)) { 72130a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 721443bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 72150a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 72160a708f8fSGustavo F. Padovan exact++; 72177eafc59eSMarcel Holtmann } else if (!bacmp(&c->src, BDADDR_ANY)) { 72180a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 721943bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 72200a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 72210a708f8fSGustavo F. Padovan } 72220a708f8fSGustavo F. Padovan } 722323691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 72240a708f8fSGustavo F. Padovan 72250a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 72260a708f8fSGustavo F. Padovan } 72270a708f8fSGustavo F. Padovan 72289e664631SAndrei Emeltchenko void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 72290a708f8fSGustavo F. Padovan { 72300a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 72310a708f8fSGustavo F. Padovan 72326ed93dc6SAndrei Emeltchenko BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 72330a708f8fSGustavo F. Padovan 72340a708f8fSGustavo F. Padovan if (!status) { 7235baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 72360a708f8fSGustavo F. Padovan if (conn) 72370a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 7238ba6fc317SAndrei Emeltchenko } else { 7239e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 7240ba6fc317SAndrei Emeltchenko } 72410a708f8fSGustavo F. Padovan } 72420a708f8fSGustavo F. Padovan 7243686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 72440a708f8fSGustavo F. Padovan { 72450a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 72460a708f8fSGustavo F. Padovan 72470a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 72480a708f8fSGustavo F. Padovan 7249686ebf28SUlisses Furquim if (!conn) 72509f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 72510a708f8fSGustavo F. Padovan return conn->disc_reason; 72520a708f8fSGustavo F. Padovan } 72530a708f8fSGustavo F. Padovan 72549e664631SAndrei Emeltchenko void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 72550a708f8fSGustavo F. Padovan { 72560a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 72570a708f8fSGustavo F. Padovan 7258e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 72590a708f8fSGustavo F. Padovan } 72600a708f8fSGustavo F. Padovan 72614343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 72620a708f8fSGustavo F. Padovan { 7263715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 72640a708f8fSGustavo F. Padovan return; 72650a708f8fSGustavo F. Padovan 72660a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 72674343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 7268ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 72697d513e92SMarcel Holtmann } else if (chan->sec_level == BT_SECURITY_HIGH || 72707d513e92SMarcel Holtmann chan->sec_level == BT_SECURITY_FIPS) 72710f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 72720a708f8fSGustavo F. Padovan } else { 72734343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 7274c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 72750a708f8fSGustavo F. Padovan } 72760a708f8fSGustavo F. Padovan } 72770a708f8fSGustavo F. Padovan 7278686ebf28SUlisses Furquim int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 72790a708f8fSGustavo F. Padovan { 72800a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 728148454079SGustavo F. Padovan struct l2cap_chan *chan; 72820a708f8fSGustavo F. Padovan 72830a708f8fSGustavo F. Padovan if (!conn) 72840a708f8fSGustavo F. Padovan return 0; 72850a708f8fSGustavo F. Padovan 728689d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 72870a708f8fSGustavo F. Padovan 7288160dc6acSVinicius Costa Gomes if (hcon->type == LE_LINK) { 728935d4adccSHemant Gupta if (!status && encrypt) 72904bd6d38eSJohan Hedberg smp_distribute_keys(conn); 729117cd3f37SUlisses Furquim cancel_delayed_work(&conn->security_timer); 7292160dc6acSVinicius Costa Gomes } 7293160dc6acSVinicius Costa Gomes 72943df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 72950a708f8fSGustavo F. Padovan 72963df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 72976be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 72980a708f8fSGustavo F. Padovan 729989d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 730089d8b407SAndrei Emeltchenko state_to_string(chan->state)); 7301f1cb9af5SVinicius Costa Gomes 73022338a7e0SJohan Hedberg if (chan->scid == L2CAP_CID_A2MP) { 730378eb2f98SAndrei Emeltchenko l2cap_chan_unlock(chan); 730478eb2f98SAndrei Emeltchenko continue; 730578eb2f98SAndrei Emeltchenko } 730678eb2f98SAndrei Emeltchenko 7307073d1cf3SJohan Hedberg if (chan->scid == L2CAP_CID_ATT) { 7308f1cb9af5SVinicius Costa Gomes if (!status && encrypt) { 7309f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 7310cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 7311f1cb9af5SVinicius Costa Gomes } 7312f1cb9af5SVinicius Costa Gomes 73136be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 7314f1cb9af5SVinicius Costa Gomes continue; 7315f1cb9af5SVinicius Costa Gomes } 7316f1cb9af5SVinicius Costa Gomes 731796eff46eSAndrei Emeltchenko if (!__l2cap_no_conn_pending(chan)) { 73186be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 73190a708f8fSGustavo F. Padovan continue; 73200a708f8fSGustavo F. Padovan } 73210a708f8fSGustavo F. Padovan 732289bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 732389bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 7324d97c899bSMarcel Holtmann chan->ops->resume(chan); 73254343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 73266be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 73270a708f8fSGustavo F. Padovan continue; 73280a708f8fSGustavo F. Padovan } 73290a708f8fSGustavo F. Padovan 733089bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 73316d3c15daSJohan Hedberg if (!status) 733293c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 73336d3c15daSJohan Hedberg else 7334ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 733589bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 73360a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 7337df3c3931SJohan Hedberg __u16 res, stat; 73380a708f8fSGustavo F. Padovan 73390a708f8fSGustavo F. Padovan if (!status) { 7340bdc25783SMarcel Holtmann if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { 7341df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 7342df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 73432dc4e510SGustavo Padovan chan->ops->defer(chan); 7344df3c3931SJohan Hedberg } else { 7345acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_CONFIG); 7346df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 7347df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 7348df3c3931SJohan Hedberg } 73490a708f8fSGustavo F. Padovan } else { 7350acdcabf5SGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 7351ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 7352df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 7353df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 73540a708f8fSGustavo F. Padovan } 73550a708f8fSGustavo F. Padovan 7356fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 7357fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 7358df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 7359df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 7360fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 7361fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 73622d369359SMat Martineau 73632d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 73642d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 73652d369359SMat Martineau char buf[128]; 73662d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 73672d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 73682d369359SMat Martineau L2CAP_CONF_REQ, 73692d369359SMat Martineau l2cap_build_conf_req(chan, buf), 73702d369359SMat Martineau buf); 73712d369359SMat Martineau chan->num_conf_req++; 73722d369359SMat Martineau } 73730a708f8fSGustavo F. Padovan } 73740a708f8fSGustavo F. Padovan 73756be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 73760a708f8fSGustavo F. Padovan } 73770a708f8fSGustavo F. Padovan 73783df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 73790a708f8fSGustavo F. Padovan 73800a708f8fSGustavo F. Padovan return 0; 73810a708f8fSGustavo F. Padovan } 73820a708f8fSGustavo F. Padovan 7383686ebf28SUlisses Furquim int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 73840a708f8fSGustavo F. Padovan { 73850a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 7386d73a0988SAndrei Emeltchenko struct l2cap_hdr *hdr; 7387d73a0988SAndrei Emeltchenko int len; 73880a708f8fSGustavo F. Padovan 73891d13a254SAndrei Emeltchenko /* For AMP controller do not create l2cap conn */ 73901d13a254SAndrei Emeltchenko if (!conn && hcon->hdev->dev_type != HCI_BREDR) 73911d13a254SAndrei Emeltchenko goto drop; 73920a708f8fSGustavo F. Padovan 73930a708f8fSGustavo F. Padovan if (!conn) 7394baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 73950a708f8fSGustavo F. Padovan 73960a708f8fSGustavo F. Padovan if (!conn) 73970a708f8fSGustavo F. Padovan goto drop; 73980a708f8fSGustavo F. Padovan 73990a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 74000a708f8fSGustavo F. Padovan 7401d73a0988SAndrei Emeltchenko switch (flags) { 7402d73a0988SAndrei Emeltchenko case ACL_START: 7403d73a0988SAndrei Emeltchenko case ACL_START_NO_FLUSH: 7404d73a0988SAndrei Emeltchenko case ACL_COMPLETE: 74050a708f8fSGustavo F. Padovan if (conn->rx_len) { 74060a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 74070a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 74080a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 74090a708f8fSGustavo F. Padovan conn->rx_len = 0; 74100a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74110a708f8fSGustavo F. Padovan } 74120a708f8fSGustavo F. Padovan 74130a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 74140a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 74150a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 74160a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74170a708f8fSGustavo F. Padovan goto drop; 74180a708f8fSGustavo F. Padovan } 74190a708f8fSGustavo F. Padovan 74200a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 74210a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 74220a708f8fSGustavo F. Padovan 74230a708f8fSGustavo F. Padovan if (len == skb->len) { 74240a708f8fSGustavo F. Padovan /* Complete frame received */ 74250a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 74260a708f8fSGustavo F. Padovan return 0; 74270a708f8fSGustavo F. Padovan } 74280a708f8fSGustavo F. Padovan 74290a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 74300a708f8fSGustavo F. Padovan 74310a708f8fSGustavo F. Padovan if (skb->len > len) { 74320a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 74330a708f8fSGustavo F. Padovan skb->len, len); 74340a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74350a708f8fSGustavo F. Padovan goto drop; 74360a708f8fSGustavo F. Padovan } 74370a708f8fSGustavo F. Padovan 74380a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 74398bcde1f2SGustavo Padovan conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 74400a708f8fSGustavo F. Padovan if (!conn->rx_skb) 74410a708f8fSGustavo F. Padovan goto drop; 74420a708f8fSGustavo F. Padovan 74430a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 74440a708f8fSGustavo F. Padovan skb->len); 74450a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 7446d73a0988SAndrei Emeltchenko break; 7447d73a0988SAndrei Emeltchenko 7448d73a0988SAndrei Emeltchenko case ACL_CONT: 74490a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 74500a708f8fSGustavo F. Padovan 74510a708f8fSGustavo F. Padovan if (!conn->rx_len) { 74520a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 74530a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74540a708f8fSGustavo F. Padovan goto drop; 74550a708f8fSGustavo F. Padovan } 74560a708f8fSGustavo F. Padovan 74570a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 74580a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 74590a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 74600a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 74610a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 74620a708f8fSGustavo F. Padovan conn->rx_len = 0; 74630a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 74640a708f8fSGustavo F. Padovan goto drop; 74650a708f8fSGustavo F. Padovan } 74660a708f8fSGustavo F. Padovan 74670a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 74680a708f8fSGustavo F. Padovan skb->len); 74690a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 74700a708f8fSGustavo F. Padovan 74710a708f8fSGustavo F. Padovan if (!conn->rx_len) { 7472c4e5bafaSJohan Hedberg /* Complete frame received. l2cap_recv_frame 7473c4e5bafaSJohan Hedberg * takes ownership of the skb so set the global 7474c4e5bafaSJohan Hedberg * rx_skb pointer to NULL first. 7475c4e5bafaSJohan Hedberg */ 7476c4e5bafaSJohan Hedberg struct sk_buff *rx_skb = conn->rx_skb; 74770a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 7478c4e5bafaSJohan Hedberg l2cap_recv_frame(conn, rx_skb); 74790a708f8fSGustavo F. Padovan } 7480d73a0988SAndrei Emeltchenko break; 74810a708f8fSGustavo F. Padovan } 74820a708f8fSGustavo F. Padovan 74830a708f8fSGustavo F. Padovan drop: 74840a708f8fSGustavo F. Padovan kfree_skb(skb); 74850a708f8fSGustavo F. Padovan return 0; 74860a708f8fSGustavo F. Padovan } 74870a708f8fSGustavo F. Padovan 74880a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 74890a708f8fSGustavo F. Padovan { 749023691d75SGustavo F. Padovan struct l2cap_chan *c; 74910a708f8fSGustavo F. Padovan 7492333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 74930a708f8fSGustavo F. Padovan 749423691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 7495fcb73338SAndrei Emeltchenko seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 74967eafc59eSMarcel Holtmann &c->src, &c->dst, 749789bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 749823691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 749923691d75SGustavo F. Padovan c->sec_level, c->mode); 75000a708f8fSGustavo F. Padovan } 75010a708f8fSGustavo F. Padovan 7502333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 75030a708f8fSGustavo F. Padovan 75040a708f8fSGustavo F. Padovan return 0; 75050a708f8fSGustavo F. Padovan } 75060a708f8fSGustavo F. Padovan 75070a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 75080a708f8fSGustavo F. Padovan { 75090a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 75100a708f8fSGustavo F. Padovan } 75110a708f8fSGustavo F. Padovan 75120a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 75130a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 75140a708f8fSGustavo F. Padovan .read = seq_read, 75150a708f8fSGustavo F. Padovan .llseek = seq_lseek, 75160a708f8fSGustavo F. Padovan .release = single_release, 75170a708f8fSGustavo F. Padovan }; 75180a708f8fSGustavo F. Padovan 75190a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 75200a708f8fSGustavo F. Padovan 752164274518SGustavo F. Padovan int __init l2cap_init(void) 75220a708f8fSGustavo F. Padovan { 75230a708f8fSGustavo F. Padovan int err; 75240a708f8fSGustavo F. Padovan 7525bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 75260a708f8fSGustavo F. Padovan if (err < 0) 75270a708f8fSGustavo F. Padovan return err; 75280a708f8fSGustavo F. Padovan 75291120e4bfSMarcel Holtmann if (IS_ERR_OR_NULL(bt_debugfs)) 75301120e4bfSMarcel Holtmann return 0; 75311120e4bfSMarcel Holtmann 75322d792818SGustavo Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, 75332d792818SGustavo Padovan NULL, &l2cap_debugfs_fops); 75340a708f8fSGustavo F. Padovan 753540b9397aSSamuel Ortiz debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, 7536f15b8ecfSJohan Hedberg &le_max_credits); 753740b9397aSSamuel Ortiz debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, 7538f15b8ecfSJohan Hedberg &le_default_mps); 7539f15b8ecfSJohan Hedberg 75400a708f8fSGustavo F. Padovan return 0; 75410a708f8fSGustavo F. Padovan } 75420a708f8fSGustavo F. Padovan 754364274518SGustavo F. Padovan void l2cap_exit(void) 75440a708f8fSGustavo F. Padovan { 75450a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 7546bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 75470a708f8fSGustavo F. Padovan } 75480a708f8fSGustavo F. Padovan 75490a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 75500a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 7551