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> 39b501d6a1SAnderson Briglia #include <net/bluetooth/smp.h> 4097e8e89dSAndrei Emeltchenko #include <net/bluetooth/a2mp.h> 415ce66b59SAndrei Emeltchenko #include <net/bluetooth/amp.h> 420a708f8fSGustavo F. Padovan 43d1de6d46SMat Martineau bool disable_ertm; 440a708f8fSGustavo F. Padovan 450a708f8fSGustavo F. Padovan static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; 4650a147cdSMat Martineau static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; 470a708f8fSGustavo F. Padovan 48b5ad8b7fSJohannes Berg static LIST_HEAD(chan_list); 49b5ad8b7fSJohannes Berg static DEFINE_RWLOCK(chan_list_lock); 500a708f8fSGustavo F. Padovan 510a708f8fSGustavo F. Padovan static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, 520a708f8fSGustavo F. Padovan u8 code, u8 ident, u16 dlen, void *data); 534519de9aSGustavo F. Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 544519de9aSGustavo F. Padovan void *data); 55710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); 565e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); 570a708f8fSGustavo F. Padovan 58d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 59608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event); 60608bcc6dSMat Martineau 610a708f8fSGustavo F. Padovan /* ---- L2CAP channels ---- */ 6271ba0e56SGustavo F. Padovan 632d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 642d792818SGustavo Padovan u16 cid) 650a708f8fSGustavo F. Padovan { 663df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 67baa7e1faSGustavo F. Padovan 683df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 693df91ea2SAndrei Emeltchenko if (c->dcid == cid) 703df91ea2SAndrei Emeltchenko return c; 710a708f8fSGustavo F. Padovan } 723df91ea2SAndrei Emeltchenko return NULL; 73baa7e1faSGustavo F. Padovan } 740a708f8fSGustavo F. Padovan 752d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, 762d792818SGustavo Padovan u16 cid) 770a708f8fSGustavo F. Padovan { 783df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 79baa7e1faSGustavo F. Padovan 803df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 813df91ea2SAndrei Emeltchenko if (c->scid == cid) 823df91ea2SAndrei Emeltchenko return c; 830a708f8fSGustavo F. Padovan } 843df91ea2SAndrei Emeltchenko return NULL; 85baa7e1faSGustavo F. Padovan } 860a708f8fSGustavo F. Padovan 870a708f8fSGustavo F. Padovan /* Find channel with given SCID. 88ef191adeSMat Martineau * Returns locked channel. */ 892d792818SGustavo Padovan static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, 902d792818SGustavo Padovan u16 cid) 910a708f8fSGustavo F. Padovan { 9248454079SGustavo F. Padovan struct l2cap_chan *c; 93baa7e1faSGustavo F. Padovan 943df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 95baa7e1faSGustavo F. Padovan c = __l2cap_get_chan_by_scid(conn, cid); 96ef191adeSMat Martineau if (c) 97ef191adeSMat Martineau l2cap_chan_lock(c); 983df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 993df91ea2SAndrei Emeltchenko 10048454079SGustavo F. Padovan return c; 1010a708f8fSGustavo F. Padovan } 1020a708f8fSGustavo F. Padovan 103b1a130b7SMat Martineau /* Find channel with given DCID. 104b1a130b7SMat Martineau * Returns locked channel. 105b1a130b7SMat Martineau */ 106b1a130b7SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, 107b1a130b7SMat Martineau u16 cid) 108b1a130b7SMat Martineau { 109b1a130b7SMat Martineau struct l2cap_chan *c; 110b1a130b7SMat Martineau 111b1a130b7SMat Martineau mutex_lock(&conn->chan_lock); 112b1a130b7SMat Martineau c = __l2cap_get_chan_by_dcid(conn, cid); 113b1a130b7SMat Martineau if (c) 114b1a130b7SMat Martineau l2cap_chan_lock(c); 115b1a130b7SMat Martineau mutex_unlock(&conn->chan_lock); 116b1a130b7SMat Martineau 117b1a130b7SMat Martineau return c; 118b1a130b7SMat Martineau } 119b1a130b7SMat Martineau 1202d792818SGustavo Padovan static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1212d792818SGustavo Padovan u8 ident) 1220a708f8fSGustavo F. Padovan { 1233df91ea2SAndrei Emeltchenko struct l2cap_chan *c; 124baa7e1faSGustavo F. Padovan 1253df91ea2SAndrei Emeltchenko list_for_each_entry(c, &conn->chan_l, list) { 1263df91ea2SAndrei Emeltchenko if (c->ident == ident) 1273df91ea2SAndrei Emeltchenko return c; 1280a708f8fSGustavo F. Padovan } 1293df91ea2SAndrei Emeltchenko return NULL; 130baa7e1faSGustavo F. Padovan } 1310a708f8fSGustavo F. Padovan 1325b155ef9SMat Martineau static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, 1335b155ef9SMat Martineau u8 ident) 1345b155ef9SMat Martineau { 1355b155ef9SMat Martineau struct l2cap_chan *c; 1365b155ef9SMat Martineau 1375b155ef9SMat Martineau mutex_lock(&conn->chan_lock); 1385b155ef9SMat Martineau c = __l2cap_get_chan_by_ident(conn, ident); 1395b155ef9SMat Martineau if (c) 1405b155ef9SMat Martineau l2cap_chan_lock(c); 1415b155ef9SMat Martineau mutex_unlock(&conn->chan_lock); 1425b155ef9SMat Martineau 1435b155ef9SMat Martineau return c; 1445b155ef9SMat Martineau } 1455b155ef9SMat Martineau 14623691d75SGustavo F. Padovan static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) 1479e4425ffSGustavo F. Padovan { 14823691d75SGustavo F. Padovan struct l2cap_chan *c; 1499e4425ffSGustavo F. Padovan 15023691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 15123691d75SGustavo F. Padovan if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) 15223691d75SGustavo F. Padovan return c; 1539e4425ffSGustavo F. Padovan } 154250938cbSSzymon Janc return NULL; 155250938cbSSzymon Janc } 1569e4425ffSGustavo F. Padovan 1579e4425ffSGustavo F. Padovan int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) 1589e4425ffSGustavo F. Padovan { 15973b2ec18SGustavo F. Padovan int err; 16073b2ec18SGustavo F. Padovan 161333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1629e4425ffSGustavo F. Padovan 16323691d75SGustavo F. Padovan if (psm && __l2cap_global_chan_by_addr(psm, src)) { 16473b2ec18SGustavo F. Padovan err = -EADDRINUSE; 16573b2ec18SGustavo F. Padovan goto done; 1669e4425ffSGustavo F. Padovan } 1679e4425ffSGustavo F. Padovan 16873b2ec18SGustavo F. Padovan if (psm) { 1699e4425ffSGustavo F. Padovan chan->psm = psm; 1709e4425ffSGustavo F. Padovan chan->sport = psm; 17173b2ec18SGustavo F. Padovan err = 0; 17273b2ec18SGustavo F. Padovan } else { 17373b2ec18SGustavo F. Padovan u16 p; 1749e4425ffSGustavo F. Padovan 17573b2ec18SGustavo F. Padovan err = -EINVAL; 17673b2ec18SGustavo F. Padovan for (p = 0x1001; p < 0x1100; p += 2) 17723691d75SGustavo F. Padovan if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { 17873b2ec18SGustavo F. Padovan chan->psm = cpu_to_le16(p); 17973b2ec18SGustavo F. Padovan chan->sport = cpu_to_le16(p); 18073b2ec18SGustavo F. Padovan err = 0; 18173b2ec18SGustavo F. Padovan break; 18273b2ec18SGustavo F. Padovan } 18373b2ec18SGustavo F. Padovan } 18473b2ec18SGustavo F. Padovan 18573b2ec18SGustavo F. Padovan done: 186333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 18773b2ec18SGustavo F. Padovan return err; 1889e4425ffSGustavo F. Padovan } 1899e4425ffSGustavo F. Padovan 1909e4425ffSGustavo F. Padovan int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) 1919e4425ffSGustavo F. Padovan { 192333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 1939e4425ffSGustavo F. Padovan 1949e4425ffSGustavo F. Padovan chan->scid = scid; 1959e4425ffSGustavo F. Padovan 196333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 1979e4425ffSGustavo F. Padovan 1989e4425ffSGustavo F. Padovan return 0; 1999e4425ffSGustavo F. Padovan } 2009e4425ffSGustavo F. Padovan 201baa7e1faSGustavo F. Padovan static u16 l2cap_alloc_cid(struct l2cap_conn *conn) 2020a708f8fSGustavo F. Padovan { 2030a708f8fSGustavo F. Padovan u16 cid = L2CAP_CID_DYN_START; 2040a708f8fSGustavo F. Padovan 2050a708f8fSGustavo F. Padovan for (; cid < L2CAP_CID_DYN_END; cid++) { 206baa7e1faSGustavo F. Padovan if (!__l2cap_get_chan_by_scid(conn, cid)) 2070a708f8fSGustavo F. Padovan return cid; 2080a708f8fSGustavo F. Padovan } 2090a708f8fSGustavo F. Padovan 2100a708f8fSGustavo F. Padovan return 0; 2110a708f8fSGustavo F. Padovan } 2120a708f8fSGustavo F. Padovan 2130e587be7SAndrei Emeltchenko static void __l2cap_state_change(struct l2cap_chan *chan, int state) 21489bc500eSGustavo F. Padovan { 21542d2d87cSAndrei Emeltchenko BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), 216badaaa00SGustavo F. Padovan state_to_string(state)); 217badaaa00SGustavo F. Padovan 21889bc500eSGustavo F. Padovan chan->state = state; 21980b98027SGustavo Padovan chan->ops->state_change(chan, state); 22089bc500eSGustavo F. Padovan } 22189bc500eSGustavo F. Padovan 2220e587be7SAndrei Emeltchenko static void l2cap_state_change(struct l2cap_chan *chan, int state) 2230e587be7SAndrei Emeltchenko { 2240e587be7SAndrei Emeltchenko struct sock *sk = chan->sk; 2250e587be7SAndrei Emeltchenko 2260e587be7SAndrei Emeltchenko lock_sock(sk); 2270e587be7SAndrei Emeltchenko __l2cap_state_change(chan, state); 2280e587be7SAndrei Emeltchenko release_sock(sk); 2290e587be7SAndrei Emeltchenko } 2300e587be7SAndrei Emeltchenko 2312e0052e4SAndrei Emeltchenko static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2322e0052e4SAndrei Emeltchenko { 2332e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2342e0052e4SAndrei Emeltchenko 2352e0052e4SAndrei Emeltchenko sk->sk_err = err; 2362e0052e4SAndrei Emeltchenko } 2372e0052e4SAndrei Emeltchenko 2382e0052e4SAndrei Emeltchenko static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) 2392e0052e4SAndrei Emeltchenko { 2402e0052e4SAndrei Emeltchenko struct sock *sk = chan->sk; 2412e0052e4SAndrei Emeltchenko 2422e0052e4SAndrei Emeltchenko lock_sock(sk); 2432e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 2442e0052e4SAndrei Emeltchenko release_sock(sk); 2452e0052e4SAndrei Emeltchenko } 2462e0052e4SAndrei Emeltchenko 2474239d16fSMat Martineau static void __set_retrans_timer(struct l2cap_chan *chan) 2484239d16fSMat Martineau { 2494239d16fSMat Martineau if (!delayed_work_pending(&chan->monitor_timer) && 2504239d16fSMat Martineau chan->retrans_timeout) { 2514239d16fSMat Martineau l2cap_set_timer(chan, &chan->retrans_timer, 2524239d16fSMat Martineau msecs_to_jiffies(chan->retrans_timeout)); 2534239d16fSMat Martineau } 2544239d16fSMat Martineau } 2554239d16fSMat Martineau 2564239d16fSMat Martineau static void __set_monitor_timer(struct l2cap_chan *chan) 2574239d16fSMat Martineau { 2584239d16fSMat Martineau __clear_retrans_timer(chan); 2594239d16fSMat Martineau if (chan->monitor_timeout) { 2604239d16fSMat Martineau l2cap_set_timer(chan, &chan->monitor_timer, 2614239d16fSMat Martineau msecs_to_jiffies(chan->monitor_timeout)); 2624239d16fSMat Martineau } 2634239d16fSMat Martineau } 2644239d16fSMat Martineau 265608bcc6dSMat Martineau static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, 266608bcc6dSMat Martineau u16 seq) 267608bcc6dSMat Martineau { 268608bcc6dSMat Martineau struct sk_buff *skb; 269608bcc6dSMat Martineau 270608bcc6dSMat Martineau skb_queue_walk(head, skb) { 271608bcc6dSMat Martineau if (bt_cb(skb)->control.txseq == seq) 272608bcc6dSMat Martineau return skb; 273608bcc6dSMat Martineau } 274608bcc6dSMat Martineau 275608bcc6dSMat Martineau return NULL; 276608bcc6dSMat Martineau } 277608bcc6dSMat Martineau 2783c588192SMat Martineau /* ---- L2CAP sequence number lists ---- */ 2793c588192SMat Martineau 2803c588192SMat Martineau /* For ERTM, ordered lists of sequence numbers must be tracked for 2813c588192SMat Martineau * SREJ requests that are received and for frames that are to be 2823c588192SMat Martineau * retransmitted. These seq_list functions implement a singly-linked 2833c588192SMat Martineau * list in an array, where membership in the list can also be checked 2843c588192SMat Martineau * in constant time. Items can also be added to the tail of the list 2853c588192SMat Martineau * and removed from the head in constant time, without further memory 2863c588192SMat Martineau * allocs or frees. 2873c588192SMat Martineau */ 2883c588192SMat Martineau 2893c588192SMat Martineau static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) 2903c588192SMat Martineau { 2913c588192SMat Martineau size_t alloc_size, i; 2923c588192SMat Martineau 2933c588192SMat Martineau /* Allocated size is a power of 2 to map sequence numbers 2943c588192SMat Martineau * (which may be up to 14 bits) in to a smaller array that is 2953c588192SMat Martineau * sized for the negotiated ERTM transmit windows. 2963c588192SMat Martineau */ 2973c588192SMat Martineau alloc_size = roundup_pow_of_two(size); 2983c588192SMat Martineau 2993c588192SMat Martineau seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); 3003c588192SMat Martineau if (!seq_list->list) 3013c588192SMat Martineau return -ENOMEM; 3023c588192SMat Martineau 3033c588192SMat Martineau seq_list->mask = alloc_size - 1; 3043c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3053c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3063c588192SMat Martineau for (i = 0; i < alloc_size; i++) 3073c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3083c588192SMat Martineau 3093c588192SMat Martineau return 0; 3103c588192SMat Martineau } 3113c588192SMat Martineau 3123c588192SMat Martineau static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) 3133c588192SMat Martineau { 3143c588192SMat Martineau kfree(seq_list->list); 3153c588192SMat Martineau } 3163c588192SMat Martineau 3173c588192SMat Martineau static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, 3183c588192SMat Martineau u16 seq) 3193c588192SMat Martineau { 3203c588192SMat Martineau /* Constant-time check for list membership */ 3213c588192SMat Martineau return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; 3223c588192SMat Martineau } 3233c588192SMat Martineau 3243c588192SMat Martineau static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) 3253c588192SMat Martineau { 3263c588192SMat Martineau u16 mask = seq_list->mask; 3273c588192SMat Martineau 3283c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { 3293c588192SMat Martineau /* In case someone tries to pop the head of an empty list */ 3303c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3313c588192SMat Martineau } else if (seq_list->head == seq) { 3323c588192SMat Martineau /* Head can be removed in constant time */ 3333c588192SMat Martineau seq_list->head = seq_list->list[seq & mask]; 3343c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3353c588192SMat Martineau 3363c588192SMat Martineau if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { 3373c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3383c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3393c588192SMat Martineau } 3403c588192SMat Martineau } else { 3413c588192SMat Martineau /* Walk the list to find the sequence number */ 3423c588192SMat Martineau u16 prev = seq_list->head; 3433c588192SMat Martineau while (seq_list->list[prev & mask] != seq) { 3443c588192SMat Martineau prev = seq_list->list[prev & mask]; 3453c588192SMat Martineau if (prev == L2CAP_SEQ_LIST_TAIL) 3463c588192SMat Martineau return L2CAP_SEQ_LIST_CLEAR; 3473c588192SMat Martineau } 3483c588192SMat Martineau 3493c588192SMat Martineau /* Unlink the number from the list and clear it */ 3503c588192SMat Martineau seq_list->list[prev & mask] = seq_list->list[seq & mask]; 3513c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; 3523c588192SMat Martineau if (seq_list->tail == seq) 3533c588192SMat Martineau seq_list->tail = prev; 3543c588192SMat Martineau } 3553c588192SMat Martineau return seq; 3563c588192SMat Martineau } 3573c588192SMat Martineau 3583c588192SMat Martineau static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) 3593c588192SMat Martineau { 3603c588192SMat Martineau /* Remove the head in constant time */ 3613c588192SMat Martineau return l2cap_seq_list_remove(seq_list, seq_list->head); 3623c588192SMat Martineau } 3633c588192SMat Martineau 3643c588192SMat Martineau static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) 3653c588192SMat Martineau { 3663c588192SMat Martineau u16 i; 367f522ae36SGustavo Padovan 368f522ae36SGustavo Padovan if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) 369f522ae36SGustavo Padovan return; 370f522ae36SGustavo Padovan 3713c588192SMat Martineau for (i = 0; i <= seq_list->mask; i++) 3723c588192SMat Martineau seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; 3733c588192SMat Martineau 3743c588192SMat Martineau seq_list->head = L2CAP_SEQ_LIST_CLEAR; 3753c588192SMat Martineau seq_list->tail = L2CAP_SEQ_LIST_CLEAR; 3763c588192SMat Martineau } 3773c588192SMat Martineau 3783c588192SMat Martineau static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) 3793c588192SMat Martineau { 3803c588192SMat Martineau u16 mask = seq_list->mask; 3813c588192SMat Martineau 3823c588192SMat Martineau /* All appends happen in constant time */ 3833c588192SMat Martineau 384f522ae36SGustavo Padovan if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) 385f522ae36SGustavo Padovan return; 386f522ae36SGustavo Padovan 3873c588192SMat Martineau if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) 3883c588192SMat Martineau seq_list->head = seq; 3893c588192SMat Martineau else 3903c588192SMat Martineau seq_list->list[seq_list->tail & mask] = seq; 3913c588192SMat Martineau 3923c588192SMat Martineau seq_list->tail = seq; 3933c588192SMat Martineau seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; 3943c588192SMat Martineau } 3953c588192SMat Martineau 396721c4181SGustavo F. Padovan static void l2cap_chan_timeout(struct work_struct *work) 397ab07801dSGustavo F. Padovan { 398721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 399721c4181SGustavo F. Padovan chan_timer.work); 4003df91ea2SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 401ab07801dSGustavo F. Padovan int reason; 402ab07801dSGustavo F. Padovan 403e05dcc32SAndrei Emeltchenko BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); 404ab07801dSGustavo F. Padovan 4053df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 4066be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 407ab07801dSGustavo F. Padovan 40889bc500eSGustavo F. Padovan if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) 409ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 41089bc500eSGustavo F. Padovan else if (chan->state == BT_CONNECT && 411ab07801dSGustavo F. Padovan chan->sec_level != BT_SECURITY_SDP) 412ab07801dSGustavo F. Padovan reason = ECONNREFUSED; 413ab07801dSGustavo F. Padovan else 414ab07801dSGustavo F. Padovan reason = ETIMEDOUT; 415ab07801dSGustavo F. Padovan 4160f852724SGustavo F. Padovan l2cap_chan_close(chan, reason); 417ab07801dSGustavo F. Padovan 4186be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 419ab07801dSGustavo F. Padovan 42080b98027SGustavo Padovan chan->ops->close(chan); 4213df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4223df91ea2SAndrei Emeltchenko 423371fd835SUlisses Furquim l2cap_chan_put(chan); 424ab07801dSGustavo F. Padovan } 425ab07801dSGustavo F. Padovan 426eef1d9b6SGustavo Padovan struct l2cap_chan *l2cap_chan_create(void) 4270a708f8fSGustavo F. Padovan { 42848454079SGustavo F. Padovan struct l2cap_chan *chan; 4290a708f8fSGustavo F. Padovan 43048454079SGustavo F. Padovan chan = kzalloc(sizeof(*chan), GFP_ATOMIC); 43148454079SGustavo F. Padovan if (!chan) 43248454079SGustavo F. Padovan return NULL; 4330a708f8fSGustavo F. Padovan 434c03b355eSAndrei Emeltchenko mutex_init(&chan->lock); 435c03b355eSAndrei Emeltchenko 436333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 43723691d75SGustavo F. Padovan list_add(&chan->global_l, &chan_list); 438333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 43923691d75SGustavo F. Padovan 440721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); 441ab07801dSGustavo F. Padovan 44289bc500eSGustavo F. Padovan chan->state = BT_OPEN; 44389bc500eSGustavo F. Padovan 444144ad330SSyam Sidhardhan kref_init(&chan->kref); 44571ba0e56SGustavo F. Padovan 4462827011fSMat Martineau /* This flag is cleared in l2cap_chan_ready() */ 4472827011fSMat Martineau set_bit(CONF_NOT_COMPLETE, &chan->conf_state); 4482827011fSMat Martineau 449eef1d9b6SGustavo Padovan BT_DBG("chan %p", chan); 450abc545b8SSzymon Janc 45148454079SGustavo F. Padovan return chan; 4520a708f8fSGustavo F. Padovan } 4530a708f8fSGustavo F. Padovan 454144ad330SSyam Sidhardhan static void l2cap_chan_destroy(struct kref *kref) 4556ff5abbfSGustavo F. Padovan { 456144ad330SSyam Sidhardhan struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); 457144ad330SSyam Sidhardhan 4584af66c69SJaganath Kanakkassery BT_DBG("chan %p", chan); 4594af66c69SJaganath Kanakkassery 460333055f2SGustavo F. Padovan write_lock(&chan_list_lock); 46123691d75SGustavo F. Padovan list_del(&chan->global_l); 462333055f2SGustavo F. Padovan write_unlock(&chan_list_lock); 46323691d75SGustavo F. Padovan 4644af66c69SJaganath Kanakkassery kfree(chan); 4656ff5abbfSGustavo F. Padovan } 4666ff5abbfSGustavo F. Padovan 46730648372SJaganath Kanakkassery void l2cap_chan_hold(struct l2cap_chan *c) 46830648372SJaganath Kanakkassery { 469144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 47030648372SJaganath Kanakkassery 471144ad330SSyam Sidhardhan kref_get(&c->kref); 47230648372SJaganath Kanakkassery } 47330648372SJaganath Kanakkassery 47430648372SJaganath Kanakkassery void l2cap_chan_put(struct l2cap_chan *c) 47530648372SJaganath Kanakkassery { 476144ad330SSyam Sidhardhan BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); 47730648372SJaganath Kanakkassery 478144ad330SSyam Sidhardhan kref_put(&c->kref, l2cap_chan_destroy); 47930648372SJaganath Kanakkassery } 48030648372SJaganath Kanakkassery 481bd4b1653SAndrei Emeltchenko void l2cap_chan_set_defaults(struct l2cap_chan *chan) 482bd4b1653SAndrei Emeltchenko { 483bd4b1653SAndrei Emeltchenko chan->fcs = L2CAP_FCS_CRC16; 484bd4b1653SAndrei Emeltchenko chan->max_tx = L2CAP_DEFAULT_MAX_TX; 485bd4b1653SAndrei Emeltchenko chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; 486bd4b1653SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 487c20f8e35SMat Martineau chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; 488bd4b1653SAndrei Emeltchenko chan->sec_level = BT_SECURITY_LOW; 489bd4b1653SAndrei Emeltchenko 490bd4b1653SAndrei Emeltchenko set_bit(FLAG_FORCE_ACTIVE, &chan->flags); 491bd4b1653SAndrei Emeltchenko } 492bd4b1653SAndrei Emeltchenko 49393c3e8f5SAndrei Emeltchenko void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 4940a708f8fSGustavo F. Padovan { 4950a708f8fSGustavo F. Padovan BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, 496097db76cSAndrei Emeltchenko __le16_to_cpu(chan->psm), chan->dcid); 4970a708f8fSGustavo F. Padovan 4989f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 4990a708f8fSGustavo F. Padovan 5008c1d787bSGustavo F. Padovan chan->conn = conn; 5010a708f8fSGustavo F. Padovan 5025491120eSAndrei Emeltchenko switch (chan->chan_type) { 5035491120eSAndrei Emeltchenko case L2CAP_CHAN_CONN_ORIENTED: 504b62f328bSVille Tervo if (conn->hcon->type == LE_LINK) { 505b62f328bSVille Tervo /* LE connection */ 5066fcb06a2SAndre Guedes chan->omtu = L2CAP_DEFAULT_MTU; 5079f22398cSJohan Hedberg if (chan->dcid == L2CAP_CID_ATT) 508073d1cf3SJohan Hedberg chan->scid = L2CAP_CID_ATT; 5099f22398cSJohan Hedberg else 5109f22398cSJohan Hedberg chan->scid = l2cap_alloc_cid(conn); 511b62f328bSVille Tervo } else { 5120a708f8fSGustavo F. Padovan /* Alloc CID for connection-oriented socket */ 513fe4128e0SGustavo F. Padovan chan->scid = l2cap_alloc_cid(conn); 5140c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 515b62f328bSVille Tervo } 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 525416fa752SAndrei Emeltchenko case L2CAP_CHAN_CONN_FIX_A2MP: 526416fa752SAndrei Emeltchenko chan->scid = L2CAP_CID_A2MP; 527416fa752SAndrei Emeltchenko chan->dcid = L2CAP_CID_A2MP; 528416fa752SAndrei Emeltchenko chan->omtu = L2CAP_A2MP_DEFAULT_MTU; 529416fa752SAndrei Emeltchenko chan->imtu = L2CAP_A2MP_DEFAULT_MTU; 530416fa752SAndrei Emeltchenko break; 531416fa752SAndrei Emeltchenko 5325491120eSAndrei Emeltchenko default: 5330a708f8fSGustavo F. Padovan /* Raw socket can send/recv signalling messages only */ 534fe4128e0SGustavo F. Padovan chan->scid = L2CAP_CID_SIGNALING; 535fe4128e0SGustavo F. Padovan chan->dcid = L2CAP_CID_SIGNALING; 5360c1bc5c6SGustavo F. Padovan chan->omtu = L2CAP_DEFAULT_MTU; 5370a708f8fSGustavo F. Padovan } 5380a708f8fSGustavo F. Padovan 5398f7975b1SAndrei Emeltchenko chan->local_id = L2CAP_BESTEFFORT_ID; 5408f7975b1SAndrei Emeltchenko chan->local_stype = L2CAP_SERV_BESTEFFORT; 5418f7975b1SAndrei Emeltchenko chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; 5428f7975b1SAndrei Emeltchenko chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; 5438f7975b1SAndrei Emeltchenko chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; 5448936fa6dSAndrei Emeltchenko chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; 5458f7975b1SAndrei Emeltchenko 546371fd835SUlisses Furquim l2cap_chan_hold(chan); 547baa7e1faSGustavo F. Padovan 5485ee9891dSJohan Hedberg hci_conn_hold(conn->hcon); 5495ee9891dSJohan Hedberg 5503df91ea2SAndrei Emeltchenko list_add(&chan->list, &conn->chan_l); 551643162a8SAndrei Emeltchenko } 552643162a8SAndrei Emeltchenko 553466f8004SAndrei Emeltchenko void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 554643162a8SAndrei Emeltchenko { 555643162a8SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 556643162a8SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 5573df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 5580a708f8fSGustavo F. Padovan } 5590a708f8fSGustavo F. Padovan 560466f8004SAndrei Emeltchenko void l2cap_chan_del(struct l2cap_chan *chan, int err) 5610a708f8fSGustavo F. Padovan { 5628c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 5630a708f8fSGustavo F. Padovan 564c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 5650a708f8fSGustavo F. Padovan 56649208c9cSGustavo F. Padovan BT_DBG("chan %p, conn %p, err %d", chan, conn, err); 5670a708f8fSGustavo F. Padovan 5680a708f8fSGustavo F. Padovan if (conn) { 56956f60984SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 570baa7e1faSGustavo F. Padovan /* Delete from channel list */ 5713df91ea2SAndrei Emeltchenko list_del(&chan->list); 5723d57dc68SGustavo F. Padovan 573371fd835SUlisses Furquim l2cap_chan_put(chan); 574baa7e1faSGustavo F. Padovan 5758c1d787bSGustavo F. Padovan chan->conn = NULL; 5763cabbfdaSAndrei Emeltchenko 5773cabbfdaSAndrei Emeltchenko if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) 57876a68ba0SDavid Herrmann hci_conn_drop(conn->hcon); 57956f60984SAndrei Emeltchenko 58056f60984SAndrei Emeltchenko if (mgr && mgr->bredr_chan == chan) 58156f60984SAndrei Emeltchenko mgr->bredr_chan = NULL; 5820a708f8fSGustavo F. Padovan } 5830a708f8fSGustavo F. Padovan 584419e08c1SAndrei Emeltchenko if (chan->hs_hchan) { 585419e08c1SAndrei Emeltchenko struct hci_chan *hs_hchan = chan->hs_hchan; 586419e08c1SAndrei Emeltchenko 587419e08c1SAndrei Emeltchenko BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); 588419e08c1SAndrei Emeltchenko amp_disconnect_logical_link(hs_hchan); 589419e08c1SAndrei Emeltchenko } 590419e08c1SAndrei Emeltchenko 591c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, err); 5926be36555SAndrei Emeltchenko 5932827011fSMat Martineau if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) 5946ff5abbfSGustavo F. Padovan return; 5952ead70b8SGustavo F. Padovan 596ee556f66SGustavo Padovan switch(chan->mode) { 597ee556f66SGustavo Padovan case L2CAP_MODE_BASIC: 598ee556f66SGustavo Padovan break; 5990a708f8fSGustavo F. Padovan 600ee556f66SGustavo Padovan case L2CAP_MODE_ERTM: 6011a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 6021a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 6031a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 6040a708f8fSGustavo F. Padovan 605f1c6775bSGustavo F. Padovan skb_queue_purge(&chan->srej_q); 6060a708f8fSGustavo F. Padovan 6073c588192SMat Martineau l2cap_seq_list_free(&chan->srej_list); 6083c588192SMat Martineau l2cap_seq_list_free(&chan->retrans_list); 609ee556f66SGustavo Padovan 610ee556f66SGustavo Padovan /* fall through */ 611ee556f66SGustavo Padovan 612ee556f66SGustavo Padovan case L2CAP_MODE_STREAMING: 613ee556f66SGustavo Padovan skb_queue_purge(&chan->tx_q); 614ee556f66SGustavo Padovan break; 6150a708f8fSGustavo F. Padovan } 616ee556f66SGustavo Padovan 617ee556f66SGustavo Padovan return; 6180a708f8fSGustavo F. Padovan } 6190a708f8fSGustavo F. Padovan 6200f852724SGustavo F. Padovan void l2cap_chan_close(struct l2cap_chan *chan, int reason) 6214519de9aSGustavo F. Padovan { 6224519de9aSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 6234519de9aSGustavo F. Padovan struct sock *sk = chan->sk; 6244519de9aSGustavo F. Padovan 6252d792818SGustavo Padovan BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), 6262d792818SGustavo Padovan sk); 6274519de9aSGustavo F. Padovan 62889bc500eSGustavo F. Padovan switch (chan->state) { 6294519de9aSGustavo F. Padovan case BT_LISTEN: 630c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6314519de9aSGustavo F. Padovan break; 6324519de9aSGustavo F. Padovan 6334519de9aSGustavo F. Padovan case BT_CONNECTED: 6344519de9aSGustavo F. Padovan case BT_CONFIG: 635715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 6364519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 637c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 6385e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, reason); 6394519de9aSGustavo F. Padovan } else 6404519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6414519de9aSGustavo F. Padovan break; 6424519de9aSGustavo F. Padovan 6434519de9aSGustavo F. Padovan case BT_CONNECT2: 644715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && 6454519de9aSGustavo F. Padovan conn->hcon->type == ACL_LINK) { 6464519de9aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 6474519de9aSGustavo F. Padovan __u16 result; 6484519de9aSGustavo F. Padovan 649c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 6504519de9aSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 6514519de9aSGustavo F. Padovan else 6524519de9aSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 65389bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_DISCONN); 6544519de9aSGustavo F. Padovan 6554519de9aSGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 6564519de9aSGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 6574519de9aSGustavo F. Padovan rsp.result = cpu_to_le16(result); 658ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 6594519de9aSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 6604519de9aSGustavo F. Padovan sizeof(rsp), &rsp); 6614519de9aSGustavo F. Padovan } 6624519de9aSGustavo F. Padovan 6634519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6644519de9aSGustavo F. Padovan break; 6654519de9aSGustavo F. Padovan 6664519de9aSGustavo F. Padovan case BT_CONNECT: 6674519de9aSGustavo F. Padovan case BT_DISCONN: 6684519de9aSGustavo F. Padovan l2cap_chan_del(chan, reason); 6694519de9aSGustavo F. Padovan break; 6704519de9aSGustavo F. Padovan 6714519de9aSGustavo F. Padovan default: 672c0df7f6eSAndrei Emeltchenko chan->ops->teardown(chan, 0); 6734519de9aSGustavo F. Padovan break; 6744519de9aSGustavo F. Padovan } 6754519de9aSGustavo F. Padovan } 6764519de9aSGustavo F. Padovan 6774343478fSGustavo F. Padovan static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) 6780a708f8fSGustavo F. Padovan { 679715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_RAW) { 6804343478fSGustavo F. Padovan switch (chan->sec_level) { 6810a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6820a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING_MITM; 6830a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 6840a708f8fSGustavo F. Padovan return HCI_AT_DEDICATED_BONDING; 6850a708f8fSGustavo F. Padovan default: 6860a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6870a708f8fSGustavo F. Padovan } 6882983fd68SAndrei Emeltchenko } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { 6894343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_LOW) 6904343478fSGustavo F. Padovan chan->sec_level = BT_SECURITY_SDP; 6910a708f8fSGustavo F. Padovan 6924343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_HIGH) 6930a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING_MITM; 6940a708f8fSGustavo F. Padovan else 6950a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 6960a708f8fSGustavo F. Padovan } else { 6974343478fSGustavo F. Padovan switch (chan->sec_level) { 6980a708f8fSGustavo F. Padovan case BT_SECURITY_HIGH: 6990a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING_MITM; 7000a708f8fSGustavo F. Padovan case BT_SECURITY_MEDIUM: 7010a708f8fSGustavo F. Padovan return HCI_AT_GENERAL_BONDING; 7020a708f8fSGustavo F. Padovan default: 7030a708f8fSGustavo F. Padovan return HCI_AT_NO_BONDING; 7040a708f8fSGustavo F. Padovan } 7050a708f8fSGustavo F. Padovan } 7060a708f8fSGustavo F. Padovan } 7070a708f8fSGustavo F. Padovan 7080a708f8fSGustavo F. Padovan /* Service level security */ 709d45fc423SGustavo F. Padovan int l2cap_chan_check_security(struct l2cap_chan *chan) 7100a708f8fSGustavo F. Padovan { 7118c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 7120a708f8fSGustavo F. Padovan __u8 auth_type; 7130a708f8fSGustavo F. Padovan 7144343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 7150a708f8fSGustavo F. Padovan 7164343478fSGustavo F. Padovan return hci_conn_security(conn->hcon, chan->sec_level, auth_type); 7170a708f8fSGustavo F. Padovan } 7180a708f8fSGustavo F. Padovan 719b5ad8b7fSJohannes Berg static u8 l2cap_get_ident(struct l2cap_conn *conn) 7200a708f8fSGustavo F. Padovan { 7210a708f8fSGustavo F. Padovan u8 id; 7220a708f8fSGustavo F. Padovan 7230a708f8fSGustavo F. Padovan /* Get next available identificator. 7240a708f8fSGustavo F. Padovan * 1 - 128 are used by kernel. 7250a708f8fSGustavo F. Padovan * 129 - 199 are reserved. 7260a708f8fSGustavo F. Padovan * 200 - 254 are used by utilities like l2ping, etc. 7270a708f8fSGustavo F. Padovan */ 7280a708f8fSGustavo F. Padovan 729333055f2SGustavo F. Padovan spin_lock(&conn->lock); 7300a708f8fSGustavo F. Padovan 7310a708f8fSGustavo F. Padovan if (++conn->tx_ident > 128) 7320a708f8fSGustavo F. Padovan conn->tx_ident = 1; 7330a708f8fSGustavo F. Padovan 7340a708f8fSGustavo F. Padovan id = conn->tx_ident; 7350a708f8fSGustavo F. Padovan 736333055f2SGustavo F. Padovan spin_unlock(&conn->lock); 7370a708f8fSGustavo F. Padovan 7380a708f8fSGustavo F. Padovan return id; 7390a708f8fSGustavo F. Padovan } 7400a708f8fSGustavo F. Padovan 7412d792818SGustavo Padovan static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, 7422d792818SGustavo Padovan void *data) 7430a708f8fSGustavo F. Padovan { 7440a708f8fSGustavo F. Padovan struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); 7450a708f8fSGustavo F. Padovan u8 flags; 7460a708f8fSGustavo F. Padovan 7470a708f8fSGustavo F. Padovan BT_DBG("code 0x%2.2x", code); 7480a708f8fSGustavo F. Padovan 7490a708f8fSGustavo F. Padovan if (!skb) 7500a708f8fSGustavo F. Padovan return; 7510a708f8fSGustavo F. Padovan 7520a708f8fSGustavo F. Padovan if (lmp_no_flush_capable(conn->hcon->hdev)) 7530a708f8fSGustavo F. Padovan flags = ACL_START_NO_FLUSH; 7540a708f8fSGustavo F. Padovan else 7550a708f8fSGustavo F. Padovan flags = ACL_START; 7560a708f8fSGustavo F. Padovan 75714b12d0bSJaikumar Ganesh bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; 7585e59b791SLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 75914b12d0bSJaikumar Ganesh 76073d80debSLuiz Augusto von Dentz hci_send_acl(conn->hchan, skb, flags); 7610a708f8fSGustavo F. Padovan } 7620a708f8fSGustavo F. Padovan 76302b0fbb9SMat Martineau static bool __chan_is_moving(struct l2cap_chan *chan) 76402b0fbb9SMat Martineau { 76502b0fbb9SMat Martineau return chan->move_state != L2CAP_MOVE_STABLE && 76602b0fbb9SMat Martineau chan->move_state != L2CAP_MOVE_WAIT_PREPARE; 76702b0fbb9SMat Martineau } 76802b0fbb9SMat Martineau 76973d80debSLuiz Augusto von Dentz static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) 77073d80debSLuiz Augusto von Dentz { 77173d80debSLuiz Augusto von Dentz struct hci_conn *hcon = chan->conn->hcon; 77273d80debSLuiz Augusto von Dentz u16 flags; 77373d80debSLuiz Augusto von Dentz 77473d80debSLuiz Augusto von Dentz BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, 77573d80debSLuiz Augusto von Dentz skb->priority); 77673d80debSLuiz Augusto von Dentz 777d5f8a75dSMat Martineau if (chan->hs_hcon && !__chan_is_moving(chan)) { 778d5f8a75dSMat Martineau if (chan->hs_hchan) 779d5f8a75dSMat Martineau hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); 780d5f8a75dSMat Martineau else 781d5f8a75dSMat Martineau kfree_skb(skb); 782d5f8a75dSMat Martineau 783d5f8a75dSMat Martineau return; 784d5f8a75dSMat Martineau } 785d5f8a75dSMat Martineau 78673d80debSLuiz Augusto von Dentz if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && 78773d80debSLuiz Augusto von Dentz lmp_no_flush_capable(hcon->hdev)) 78873d80debSLuiz Augusto von Dentz flags = ACL_START_NO_FLUSH; 78973d80debSLuiz Augusto von Dentz else 79073d80debSLuiz Augusto von Dentz flags = ACL_START; 79173d80debSLuiz Augusto von Dentz 79273d80debSLuiz Augusto von Dentz bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); 79373d80debSLuiz Augusto von Dentz hci_send_acl(chan->conn->hchan, skb, flags); 7940a708f8fSGustavo F. Padovan } 7950a708f8fSGustavo F. Padovan 796b5c6aaedSMat Martineau static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) 797b5c6aaedSMat Martineau { 798b5c6aaedSMat Martineau control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; 799b5c6aaedSMat Martineau control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; 800b5c6aaedSMat Martineau 801b5c6aaedSMat Martineau if (enh & L2CAP_CTRL_FRAME_TYPE) { 802b5c6aaedSMat Martineau /* S-Frame */ 803b5c6aaedSMat Martineau control->sframe = 1; 804b5c6aaedSMat Martineau control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; 805b5c6aaedSMat Martineau control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; 806b5c6aaedSMat Martineau 807b5c6aaedSMat Martineau control->sar = 0; 808b5c6aaedSMat Martineau control->txseq = 0; 809b5c6aaedSMat Martineau } else { 810b5c6aaedSMat Martineau /* I-Frame */ 811b5c6aaedSMat Martineau control->sframe = 0; 812b5c6aaedSMat Martineau control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; 813b5c6aaedSMat Martineau control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; 814b5c6aaedSMat Martineau 815b5c6aaedSMat Martineau control->poll = 0; 816b5c6aaedSMat Martineau control->super = 0; 817b5c6aaedSMat Martineau } 818b5c6aaedSMat Martineau } 819b5c6aaedSMat Martineau 820b5c6aaedSMat Martineau static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) 821b5c6aaedSMat Martineau { 822b5c6aaedSMat Martineau control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; 823b5c6aaedSMat Martineau control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; 824b5c6aaedSMat Martineau 825b5c6aaedSMat Martineau if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { 826b5c6aaedSMat Martineau /* S-Frame */ 827b5c6aaedSMat Martineau control->sframe = 1; 828b5c6aaedSMat Martineau control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; 829b5c6aaedSMat Martineau control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; 830b5c6aaedSMat Martineau 831b5c6aaedSMat Martineau control->sar = 0; 832b5c6aaedSMat Martineau control->txseq = 0; 833b5c6aaedSMat Martineau } else { 834b5c6aaedSMat Martineau /* I-Frame */ 835b5c6aaedSMat Martineau control->sframe = 0; 836b5c6aaedSMat Martineau control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; 837b5c6aaedSMat Martineau control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; 838b5c6aaedSMat Martineau 839b5c6aaedSMat Martineau control->poll = 0; 840b5c6aaedSMat Martineau control->super = 0; 841b5c6aaedSMat Martineau } 842b5c6aaedSMat Martineau } 843b5c6aaedSMat Martineau 844b5c6aaedSMat Martineau static inline void __unpack_control(struct l2cap_chan *chan, 845b5c6aaedSMat Martineau struct sk_buff *skb) 846b5c6aaedSMat Martineau { 847b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 848b5c6aaedSMat Martineau __unpack_extended_control(get_unaligned_le32(skb->data), 849b5c6aaedSMat Martineau &bt_cb(skb)->control); 850cec8ab6eSMat Martineau skb_pull(skb, L2CAP_EXT_CTRL_SIZE); 851b5c6aaedSMat Martineau } else { 852b5c6aaedSMat Martineau __unpack_enhanced_control(get_unaligned_le16(skb->data), 853b5c6aaedSMat Martineau &bt_cb(skb)->control); 854cec8ab6eSMat Martineau skb_pull(skb, L2CAP_ENH_CTRL_SIZE); 855b5c6aaedSMat Martineau } 856b5c6aaedSMat Martineau } 857b5c6aaedSMat Martineau 858b5c6aaedSMat Martineau static u32 __pack_extended_control(struct l2cap_ctrl *control) 859b5c6aaedSMat Martineau { 860b5c6aaedSMat Martineau u32 packed; 861b5c6aaedSMat Martineau 862b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; 863b5c6aaedSMat Martineau packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; 864b5c6aaedSMat Martineau 865b5c6aaedSMat Martineau if (control->sframe) { 866b5c6aaedSMat Martineau packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; 867b5c6aaedSMat Martineau packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; 868b5c6aaedSMat Martineau packed |= L2CAP_EXT_CTRL_FRAME_TYPE; 869b5c6aaedSMat Martineau } else { 870b5c6aaedSMat Martineau packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; 871b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; 872b5c6aaedSMat Martineau } 873b5c6aaedSMat Martineau 874b5c6aaedSMat Martineau return packed; 875b5c6aaedSMat Martineau } 876b5c6aaedSMat Martineau 877b5c6aaedSMat Martineau static u16 __pack_enhanced_control(struct l2cap_ctrl *control) 878b5c6aaedSMat Martineau { 879b5c6aaedSMat Martineau u16 packed; 880b5c6aaedSMat Martineau 881b5c6aaedSMat Martineau packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; 882b5c6aaedSMat Martineau packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; 883b5c6aaedSMat Martineau 884b5c6aaedSMat Martineau if (control->sframe) { 885b5c6aaedSMat Martineau packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; 886b5c6aaedSMat Martineau packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; 887b5c6aaedSMat Martineau packed |= L2CAP_CTRL_FRAME_TYPE; 888b5c6aaedSMat Martineau } else { 889b5c6aaedSMat Martineau packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; 890b5c6aaedSMat Martineau packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; 891b5c6aaedSMat Martineau } 892b5c6aaedSMat Martineau 893b5c6aaedSMat Martineau return packed; 894b5c6aaedSMat Martineau } 895b5c6aaedSMat Martineau 896b5c6aaedSMat Martineau static inline void __pack_control(struct l2cap_chan *chan, 897b5c6aaedSMat Martineau struct l2cap_ctrl *control, 898b5c6aaedSMat Martineau struct sk_buff *skb) 899b5c6aaedSMat Martineau { 900b5c6aaedSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 901b5c6aaedSMat Martineau put_unaligned_le32(__pack_extended_control(control), 902b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 903b5c6aaedSMat Martineau } else { 904b5c6aaedSMat Martineau put_unaligned_le16(__pack_enhanced_control(control), 905b5c6aaedSMat Martineau skb->data + L2CAP_HDR_SIZE); 906b5c6aaedSMat Martineau } 907b5c6aaedSMat Martineau } 908b5c6aaedSMat Martineau 909ba7aa64fSGustavo Padovan static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) 910ba7aa64fSGustavo Padovan { 911ba7aa64fSGustavo Padovan if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 912ba7aa64fSGustavo Padovan return L2CAP_EXT_HDR_SIZE; 913ba7aa64fSGustavo Padovan else 914ba7aa64fSGustavo Padovan return L2CAP_ENH_HDR_SIZE; 915ba7aa64fSGustavo Padovan } 916ba7aa64fSGustavo Padovan 917a67d7f6fSMat Martineau static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, 918a67d7f6fSMat Martineau u32 control) 9190a708f8fSGustavo F. Padovan { 9200a708f8fSGustavo F. Padovan struct sk_buff *skb; 9210a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 922ba7aa64fSGustavo Padovan int hlen = __ertm_hdr_size(chan); 9230a708f8fSGustavo F. Padovan 9240a708f8fSGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 92503a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 9260a708f8fSGustavo F. Padovan 927a67d7f6fSMat Martineau skb = bt_skb_alloc(hlen, GFP_KERNEL); 9280a708f8fSGustavo F. Padovan 9290a708f8fSGustavo F. Padovan if (!skb) 930a67d7f6fSMat Martineau return ERR_PTR(-ENOMEM); 9310a708f8fSGustavo F. Padovan 9320a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 9330a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); 934fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 93588843ab0SAndrei Emeltchenko 936a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 937a67d7f6fSMat Martineau put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 938a67d7f6fSMat Martineau else 939a67d7f6fSMat Martineau put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 9400a708f8fSGustavo F. Padovan 94147d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 942a67d7f6fSMat Martineau u16 fcs = crc16(0, (u8 *)skb->data, skb->len); 94303a51213SAndrei Emeltchenko put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 9440a708f8fSGustavo F. Padovan } 9450a708f8fSGustavo F. Padovan 94673d80debSLuiz Augusto von Dentz skb->priority = HCI_PRIO_MAX; 947a67d7f6fSMat Martineau return skb; 948a67d7f6fSMat Martineau } 949a67d7f6fSMat Martineau 950a67d7f6fSMat Martineau static void l2cap_send_sframe(struct l2cap_chan *chan, 951a67d7f6fSMat Martineau struct l2cap_ctrl *control) 952a67d7f6fSMat Martineau { 953a67d7f6fSMat Martineau struct sk_buff *skb; 954a67d7f6fSMat Martineau u32 control_field; 955a67d7f6fSMat Martineau 956a67d7f6fSMat Martineau BT_DBG("chan %p, control %p", chan, control); 957a67d7f6fSMat Martineau 958a67d7f6fSMat Martineau if (!control->sframe) 959a67d7f6fSMat Martineau return; 960a67d7f6fSMat Martineau 961b99e13adSMat Martineau if (__chan_is_moving(chan)) 962b99e13adSMat Martineau return; 963b99e13adSMat Martineau 964a67d7f6fSMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && 965a67d7f6fSMat Martineau !control->poll) 966a67d7f6fSMat Martineau control->final = 1; 967a67d7f6fSMat Martineau 968a67d7f6fSMat Martineau if (control->super == L2CAP_SUPER_RR) 969a67d7f6fSMat Martineau clear_bit(CONN_RNR_SENT, &chan->conn_state); 970a67d7f6fSMat Martineau else if (control->super == L2CAP_SUPER_RNR) 971a67d7f6fSMat Martineau set_bit(CONN_RNR_SENT, &chan->conn_state); 972a67d7f6fSMat Martineau 973a67d7f6fSMat Martineau if (control->super != L2CAP_SUPER_SREJ) { 974a67d7f6fSMat Martineau chan->last_acked_seq = control->reqseq; 975a67d7f6fSMat Martineau __clear_ack_timer(chan); 976a67d7f6fSMat Martineau } 977a67d7f6fSMat Martineau 978a67d7f6fSMat Martineau BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, 979a67d7f6fSMat Martineau control->final, control->poll, control->super); 980a67d7f6fSMat Martineau 981a67d7f6fSMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 982a67d7f6fSMat Martineau control_field = __pack_extended_control(control); 983a67d7f6fSMat Martineau else 984a67d7f6fSMat Martineau control_field = __pack_enhanced_control(control); 985a67d7f6fSMat Martineau 986a67d7f6fSMat Martineau skb = l2cap_create_sframe_pdu(chan, control_field); 987a67d7f6fSMat Martineau if (!IS_ERR(skb)) 98873d80debSLuiz Augusto von Dentz l2cap_do_send(chan, skb); 9890a708f8fSGustavo F. Padovan } 9900a708f8fSGustavo F. Padovan 991c9e3d5e0SMat Martineau static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) 9920a708f8fSGustavo F. Padovan { 993c9e3d5e0SMat Martineau struct l2cap_ctrl control; 9940a708f8fSGustavo F. Padovan 995c9e3d5e0SMat Martineau BT_DBG("chan %p, poll %d", chan, poll); 996c9e3d5e0SMat Martineau 997c9e3d5e0SMat Martineau memset(&control, 0, sizeof(control)); 998c9e3d5e0SMat Martineau control.sframe = 1; 999c9e3d5e0SMat Martineau control.poll = poll; 1000c9e3d5e0SMat Martineau 1001c9e3d5e0SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 1002c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RNR; 1003c9e3d5e0SMat Martineau else 1004c9e3d5e0SMat Martineau control.super = L2CAP_SUPER_RR; 1005c9e3d5e0SMat Martineau 1006c9e3d5e0SMat Martineau control.reqseq = chan->buffer_seq; 1007c9e3d5e0SMat Martineau l2cap_send_sframe(chan, &control); 10080a708f8fSGustavo F. Padovan } 10090a708f8fSGustavo F. Padovan 1010b4450035SGustavo F. Padovan static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) 10110a708f8fSGustavo F. Padovan { 1012c1360a1cSGustavo F. Padovan return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); 10130a708f8fSGustavo F. Padovan } 10140a708f8fSGustavo F. Padovan 101593c3e8f5SAndrei Emeltchenko static bool __amp_capable(struct l2cap_chan *chan) 101693c3e8f5SAndrei Emeltchenko { 101793c3e8f5SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 101893c3e8f5SAndrei Emeltchenko 1019848566b3SMarcel Holtmann if (conn->hs_enabled && hci_amp_capable() && 102093c3e8f5SAndrei Emeltchenko chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && 102193c3e8f5SAndrei Emeltchenko conn->fixed_chan_mask & L2CAP_FC_A2MP) 102293c3e8f5SAndrei Emeltchenko return true; 1023848566b3SMarcel Holtmann 102493c3e8f5SAndrei Emeltchenko return false; 102593c3e8f5SAndrei Emeltchenko } 102693c3e8f5SAndrei Emeltchenko 10275ce66b59SAndrei Emeltchenko static bool l2cap_check_efs(struct l2cap_chan *chan) 10285ce66b59SAndrei Emeltchenko { 10295ce66b59SAndrei Emeltchenko /* Check EFS parameters */ 10305ce66b59SAndrei Emeltchenko return true; 10315ce66b59SAndrei Emeltchenko } 10325ce66b59SAndrei Emeltchenko 10332766be48SAndrei Emeltchenko void l2cap_send_conn_req(struct l2cap_chan *chan) 10349b27f350SAndrei Emeltchenko { 10359b27f350SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 10369b27f350SAndrei Emeltchenko struct l2cap_conn_req req; 10379b27f350SAndrei Emeltchenko 10389b27f350SAndrei Emeltchenko req.scid = cpu_to_le16(chan->scid); 10399b27f350SAndrei Emeltchenko req.psm = chan->psm; 10409b27f350SAndrei Emeltchenko 10419b27f350SAndrei Emeltchenko chan->ident = l2cap_get_ident(conn); 10429b27f350SAndrei Emeltchenko 10439b27f350SAndrei Emeltchenko set_bit(CONF_CONNECT_PEND, &chan->conf_state); 10449b27f350SAndrei Emeltchenko 10459b27f350SAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); 10469b27f350SAndrei Emeltchenko } 10479b27f350SAndrei Emeltchenko 10488eb200bdSMat Martineau static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) 10498eb200bdSMat Martineau { 10508eb200bdSMat Martineau struct l2cap_create_chan_req req; 10518eb200bdSMat Martineau req.scid = cpu_to_le16(chan->scid); 10528eb200bdSMat Martineau req.psm = chan->psm; 10538eb200bdSMat Martineau req.amp_id = amp_id; 10548eb200bdSMat Martineau 10558eb200bdSMat Martineau chan->ident = l2cap_get_ident(chan->conn); 10568eb200bdSMat Martineau 10578eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, 10588eb200bdSMat Martineau sizeof(req), &req); 10598eb200bdSMat Martineau } 10608eb200bdSMat Martineau 106102b0fbb9SMat Martineau static void l2cap_move_setup(struct l2cap_chan *chan) 106202b0fbb9SMat Martineau { 106302b0fbb9SMat Martineau struct sk_buff *skb; 106402b0fbb9SMat Martineau 106502b0fbb9SMat Martineau BT_DBG("chan %p", chan); 106602b0fbb9SMat Martineau 106702b0fbb9SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 106802b0fbb9SMat Martineau return; 106902b0fbb9SMat Martineau 107002b0fbb9SMat Martineau __clear_retrans_timer(chan); 107102b0fbb9SMat Martineau __clear_monitor_timer(chan); 107202b0fbb9SMat Martineau __clear_ack_timer(chan); 107302b0fbb9SMat Martineau 107402b0fbb9SMat Martineau chan->retry_count = 0; 107502b0fbb9SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 107602b0fbb9SMat Martineau if (bt_cb(skb)->control.retries) 107702b0fbb9SMat Martineau bt_cb(skb)->control.retries = 1; 107802b0fbb9SMat Martineau else 107902b0fbb9SMat Martineau break; 108002b0fbb9SMat Martineau } 108102b0fbb9SMat Martineau 108202b0fbb9SMat Martineau chan->expected_tx_seq = chan->buffer_seq; 108302b0fbb9SMat Martineau 108402b0fbb9SMat Martineau clear_bit(CONN_REJ_ACT, &chan->conn_state); 108502b0fbb9SMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 108602b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 108702b0fbb9SMat Martineau l2cap_seq_list_clear(&chan->srej_list); 108802b0fbb9SMat Martineau skb_queue_purge(&chan->srej_q); 108902b0fbb9SMat Martineau 109002b0fbb9SMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 109102b0fbb9SMat Martineau chan->rx_state = L2CAP_RX_STATE_MOVE; 109202b0fbb9SMat Martineau 109302b0fbb9SMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 109402b0fbb9SMat Martineau } 109502b0fbb9SMat Martineau 10965f3847a4SMat Martineau static void l2cap_move_done(struct l2cap_chan *chan) 10975f3847a4SMat Martineau { 10985f3847a4SMat Martineau u8 move_role = chan->move_role; 10995f3847a4SMat Martineau BT_DBG("chan %p", chan); 11005f3847a4SMat Martineau 11015f3847a4SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 11025f3847a4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 11035f3847a4SMat Martineau 11045f3847a4SMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 11055f3847a4SMat Martineau return; 11065f3847a4SMat Martineau 11075f3847a4SMat Martineau switch (move_role) { 11085f3847a4SMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 11095f3847a4SMat Martineau l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); 11105f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_F; 11115f3847a4SMat Martineau break; 11125f3847a4SMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 11135f3847a4SMat Martineau chan->rx_state = L2CAP_RX_STATE_WAIT_P; 11145f3847a4SMat Martineau break; 11155f3847a4SMat Martineau } 11165f3847a4SMat Martineau } 11175f3847a4SMat Martineau 11189f0caeb1SVinicius Costa Gomes static void l2cap_chan_ready(struct l2cap_chan *chan) 11199f0caeb1SVinicius Costa Gomes { 11202827011fSMat Martineau /* This clears all conf flags, including CONF_NOT_COMPLETE */ 11219f0caeb1SVinicius Costa Gomes chan->conf_state = 0; 11229f0caeb1SVinicius Costa Gomes __clear_chan_timer(chan); 11239f0caeb1SVinicius Costa Gomes 112454a59aa2SAndrei Emeltchenko chan->state = BT_CONNECTED; 11259f0caeb1SVinicius Costa Gomes 112654a59aa2SAndrei Emeltchenko chan->ops->ready(chan); 11279f0caeb1SVinicius Costa Gomes } 11289f0caeb1SVinicius Costa Gomes 112993c3e8f5SAndrei Emeltchenko static void l2cap_start_connection(struct l2cap_chan *chan) 113093c3e8f5SAndrei Emeltchenko { 113193c3e8f5SAndrei Emeltchenko if (__amp_capable(chan)) { 113293c3e8f5SAndrei Emeltchenko BT_DBG("chan %p AMP capable: discover AMPs", chan); 113393c3e8f5SAndrei Emeltchenko a2mp_discover_amp(chan); 113493c3e8f5SAndrei Emeltchenko } else { 113593c3e8f5SAndrei Emeltchenko l2cap_send_conn_req(chan); 113693c3e8f5SAndrei Emeltchenko } 113793c3e8f5SAndrei Emeltchenko } 113893c3e8f5SAndrei Emeltchenko 1139fc7f8a7eSGustavo F. Padovan static void l2cap_do_start(struct l2cap_chan *chan) 11400a708f8fSGustavo F. Padovan { 11418c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 11420a708f8fSGustavo F. Padovan 11439f0caeb1SVinicius Costa Gomes if (conn->hcon->type == LE_LINK) { 11449f0caeb1SVinicius Costa Gomes l2cap_chan_ready(chan); 11459f0caeb1SVinicius Costa Gomes return; 11469f0caeb1SVinicius Costa Gomes } 11479f0caeb1SVinicius Costa Gomes 11480a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { 11490a708f8fSGustavo F. Padovan if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) 11500a708f8fSGustavo F. Padovan return; 11510a708f8fSGustavo F. Padovan 1152d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan) && 115393c3e8f5SAndrei Emeltchenko __l2cap_no_conn_pending(chan)) { 115493c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 115593c3e8f5SAndrei Emeltchenko } 11560a708f8fSGustavo F. Padovan } else { 11570a708f8fSGustavo F. Padovan struct l2cap_info_req req; 1158ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 11590a708f8fSGustavo F. Padovan 11600a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 11610a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 11620a708f8fSGustavo F. Padovan 1163ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 11640a708f8fSGustavo F. Padovan 11652d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 11662d792818SGustavo Padovan sizeof(req), &req); 11670a708f8fSGustavo F. Padovan } 11680a708f8fSGustavo F. Padovan } 11690a708f8fSGustavo F. Padovan 11700a708f8fSGustavo F. Padovan static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) 11710a708f8fSGustavo F. Padovan { 11720a708f8fSGustavo F. Padovan u32 local_feat_mask = l2cap_feat_mask; 11730a708f8fSGustavo F. Padovan if (!disable_ertm) 11740a708f8fSGustavo F. Padovan local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; 11750a708f8fSGustavo F. Padovan 11760a708f8fSGustavo F. Padovan switch (mode) { 11770a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 11780a708f8fSGustavo F. Padovan return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; 11790a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 11800a708f8fSGustavo F. Padovan return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; 11810a708f8fSGustavo F. Padovan default: 11820a708f8fSGustavo F. Padovan return 0x00; 11830a708f8fSGustavo F. Padovan } 11840a708f8fSGustavo F. Padovan } 11850a708f8fSGustavo F. Padovan 11865e4e3972SAndrei Emeltchenko static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) 11870a708f8fSGustavo F. Padovan { 11886be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 11895e4e3972SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 11900a708f8fSGustavo F. Padovan struct l2cap_disconn_req req; 11910a708f8fSGustavo F. Padovan 11920a708f8fSGustavo F. Padovan if (!conn) 11930a708f8fSGustavo F. Padovan return; 11940a708f8fSGustavo F. Padovan 1195aad3d0e3SAndrei Emeltchenko if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { 11961a09bcb9SGustavo F. Padovan __clear_retrans_timer(chan); 11971a09bcb9SGustavo F. Padovan __clear_monitor_timer(chan); 11981a09bcb9SGustavo F. Padovan __clear_ack_timer(chan); 11990a708f8fSGustavo F. Padovan } 12000a708f8fSGustavo F. Padovan 1201416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1202d117773cSGustavo Padovan l2cap_state_change(chan, BT_DISCONN); 1203416fa752SAndrei Emeltchenko return; 1204416fa752SAndrei Emeltchenko } 1205416fa752SAndrei Emeltchenko 1206fe4128e0SGustavo F. Padovan req.dcid = cpu_to_le16(chan->dcid); 1207fe4128e0SGustavo F. Padovan req.scid = cpu_to_le16(chan->scid); 12082d792818SGustavo Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, 12092d792818SGustavo Padovan sizeof(req), &req); 12100a708f8fSGustavo F. Padovan 12116be36555SAndrei Emeltchenko lock_sock(sk); 12120e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 12132e0052e4SAndrei Emeltchenko __l2cap_chan_set_err(chan, err); 12146be36555SAndrei Emeltchenko release_sock(sk); 12150a708f8fSGustavo F. Padovan } 12160a708f8fSGustavo F. Padovan 12170a708f8fSGustavo F. Padovan /* ---- L2CAP connections ---- */ 12180a708f8fSGustavo F. Padovan static void l2cap_conn_start(struct l2cap_conn *conn) 12190a708f8fSGustavo F. Padovan { 12203df91ea2SAndrei Emeltchenko struct l2cap_chan *chan, *tmp; 12210a708f8fSGustavo F. Padovan 12220a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 12230a708f8fSGustavo F. Padovan 12243df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 12250a708f8fSGustavo F. Padovan 12263df91ea2SAndrei Emeltchenko list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { 122748454079SGustavo F. Padovan struct sock *sk = chan->sk; 1228baa7e1faSGustavo F. Padovan 12296be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 12300a708f8fSGustavo F. Padovan 1231715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 12326be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12330a708f8fSGustavo F. Padovan continue; 12340a708f8fSGustavo F. Padovan } 12350a708f8fSGustavo F. Padovan 123689bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 1237d45fc423SGustavo F. Padovan if (!l2cap_chan_check_security(chan) || 1238b4450035SGustavo F. Padovan !__l2cap_no_conn_pending(chan)) { 12396be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12400a708f8fSGustavo F. Padovan continue; 12410a708f8fSGustavo F. Padovan } 12420a708f8fSGustavo F. Padovan 1243c1360a1cSGustavo F. Padovan if (!l2cap_mode_supported(chan->mode, conn->feat_mask) 1244c1360a1cSGustavo F. Padovan && test_bit(CONF_STATE2_DEVICE, 1245c1360a1cSGustavo F. Padovan &chan->conf_state)) { 12460f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNRESET); 12476be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12480a708f8fSGustavo F. Padovan continue; 12490a708f8fSGustavo F. Padovan } 12500a708f8fSGustavo F. Padovan 125193c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 12520a708f8fSGustavo F. Padovan 125389bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 12540a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 12550a708f8fSGustavo F. Padovan char buf[128]; 1256fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 1257fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 12580a708f8fSGustavo F. Padovan 1259d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 12606be36555SAndrei Emeltchenko lock_sock(sk); 1261c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 1262c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 1263ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1264ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); 12652dc4e510SGustavo Padovan chan->ops->defer(chan); 12660a708f8fSGustavo F. Padovan 12670a708f8fSGustavo F. Padovan } else { 12680e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 1269ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 1270ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 12710a708f8fSGustavo F. Padovan } 12726be36555SAndrei Emeltchenko release_sock(sk); 12730a708f8fSGustavo F. Padovan } else { 1274ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); 1275ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); 12760a708f8fSGustavo F. Padovan } 12770a708f8fSGustavo F. Padovan 1278fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 1279fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 12800a708f8fSGustavo F. Padovan 1281c1360a1cSGustavo F. Padovan if (test_bit(CONF_REQ_SENT, &chan->conf_state) || 12820a708f8fSGustavo F. Padovan rsp.result != L2CAP_CR_SUCCESS) { 12836be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12840a708f8fSGustavo F. Padovan continue; 12850a708f8fSGustavo F. Padovan } 12860a708f8fSGustavo F. Padovan 1287c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 12880a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 128973ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 129073ffa904SGustavo F. Padovan chan->num_conf_req++; 12910a708f8fSGustavo F. Padovan } 12920a708f8fSGustavo F. Padovan 12936be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 12940a708f8fSGustavo F. Padovan } 12950a708f8fSGustavo F. Padovan 12963df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 12970a708f8fSGustavo F. Padovan } 12980a708f8fSGustavo F. Padovan 1299c2287681SIdo Yariv /* Find socket with cid and source/destination bdaddr. 1300b62f328bSVille Tervo * Returns closest match, locked. 1301b62f328bSVille Tervo */ 1302d9b88702SAndrei Emeltchenko static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, 1303c2287681SIdo Yariv bdaddr_t *src, 1304c2287681SIdo Yariv bdaddr_t *dst) 1305b62f328bSVille Tervo { 130623691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 1307b62f328bSVille Tervo 130823691d75SGustavo F. Padovan read_lock(&chan_list_lock); 1309b62f328bSVille Tervo 131023691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 131123691d75SGustavo F. Padovan struct sock *sk = c->sk; 1312fe4128e0SGustavo F. Padovan 131389bc500eSGustavo F. Padovan if (state && c->state != state) 1314b62f328bSVille Tervo continue; 1315b62f328bSVille Tervo 131623691d75SGustavo F. Padovan if (c->scid == cid) { 1317c2287681SIdo Yariv int src_match, dst_match; 1318c2287681SIdo Yariv int src_any, dst_any; 1319c2287681SIdo Yariv 1320b62f328bSVille Tervo /* Exact match. */ 1321c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1322c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1323c2287681SIdo Yariv if (src_match && dst_match) { 132423691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 132523691d75SGustavo F. Padovan return c; 132623691d75SGustavo F. Padovan } 1327b62f328bSVille Tervo 1328b62f328bSVille Tervo /* Closest match */ 1329c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1330c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1331c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1332c2287681SIdo Yariv (src_any && dst_any)) 133323691d75SGustavo F. Padovan c1 = c; 1334b62f328bSVille Tervo } 1335b62f328bSVille Tervo } 1336280f294fSGustavo F. Padovan 133723691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 1338b62f328bSVille Tervo 133923691d75SGustavo F. Padovan return c1; 1340b62f328bSVille Tervo } 1341b62f328bSVille Tervo 1342b62f328bSVille Tervo static void l2cap_le_conn_ready(struct l2cap_conn *conn) 1343b62f328bSVille Tervo { 134460bac184SJohan Hedberg struct sock *parent; 134523691d75SGustavo F. Padovan struct l2cap_chan *chan, *pchan; 1346b62f328bSVille Tervo 1347b62f328bSVille Tervo BT_DBG(""); 1348b62f328bSVille Tervo 1349b62f328bSVille Tervo /* Check if we have socket listening on cid */ 1350073d1cf3SJohan Hedberg pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, 1351c2287681SIdo Yariv conn->src, conn->dst); 135223691d75SGustavo F. Padovan if (!pchan) 1353b62f328bSVille Tervo return; 1354b62f328bSVille Tervo 135544f3b0fbSJohan Hedberg /* Client ATT sockets should override the server one */ 135644f3b0fbSJohan Hedberg if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) 135744f3b0fbSJohan Hedberg return; 135844f3b0fbSJohan Hedberg 135923691d75SGustavo F. Padovan parent = pchan->sk; 136023691d75SGustavo F. Padovan 1361aa2ac881SGustavo F. Padovan lock_sock(parent); 136262f3a2cfSGustavo F. Padovan 136380b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 136480808e43SGustavo F. Padovan if (!chan) 1365b62f328bSVille Tervo goto clean; 1366b62f328bSVille Tervo 13679f22398cSJohan Hedberg chan->dcid = L2CAP_CID_ATT; 13689f22398cSJohan Hedberg 136960bac184SJohan Hedberg bacpy(&bt_sk(chan->sk)->src, conn->src); 137060bac184SJohan Hedberg bacpy(&bt_sk(chan->sk)->dst, conn->dst); 1371b62f328bSVille Tervo 137244f3b0fbSJohan Hedberg __l2cap_chan_add(conn, chan); 137348454079SGustavo F. Padovan 1374b62f328bSVille Tervo clean: 1375aa2ac881SGustavo F. Padovan release_sock(parent); 1376b62f328bSVille Tervo } 1377b62f328bSVille Tervo 13780a708f8fSGustavo F. Padovan static void l2cap_conn_ready(struct l2cap_conn *conn) 13790a708f8fSGustavo F. Padovan { 138048454079SGustavo F. Padovan struct l2cap_chan *chan; 1381cc110922SVinicius Costa Gomes struct hci_conn *hcon = conn->hcon; 13820a708f8fSGustavo F. Padovan 13830a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 13840a708f8fSGustavo F. Padovan 1385d8729922SJohan Hedberg /* For outgoing pairing which doesn't necessarily have an 1386d8729922SJohan Hedberg * associated socket (e.g. mgmt_pair_device). 1387d8729922SJohan Hedberg */ 1388cc110922SVinicius Costa Gomes if (hcon->out && hcon->type == LE_LINK) 1389cc110922SVinicius Costa Gomes smp_conn_security(hcon, hcon->pending_sec_level); 1390160dc6acSVinicius Costa Gomes 13913df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 13920a708f8fSGustavo F. Padovan 139344f3b0fbSJohan Hedberg if (hcon->type == LE_LINK) 139444f3b0fbSJohan Hedberg l2cap_le_conn_ready(conn); 139544f3b0fbSJohan Hedberg 13963df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1397baa7e1faSGustavo F. Padovan 13986be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 13990a708f8fSGustavo F. Padovan 1400416fa752SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 1401416fa752SAndrei Emeltchenko l2cap_chan_unlock(chan); 1402416fa752SAndrei Emeltchenko continue; 1403416fa752SAndrei Emeltchenko } 1404416fa752SAndrei Emeltchenko 1405cc110922SVinicius Costa Gomes if (hcon->type == LE_LINK) { 1406cc110922SVinicius Costa Gomes if (smp_conn_security(hcon, chan->sec_level)) 1407cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 1408acd7d370SVille Tervo 140963128451SVinicius Costa Gomes } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 14106be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 1411c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 14126be36555SAndrei Emeltchenko lock_sock(sk); 14130e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECTED); 14140a708f8fSGustavo F. Padovan sk->sk_state_change(sk); 14156be36555SAndrei Emeltchenko release_sock(sk); 1416b501d6a1SAnderson Briglia 14171c244f79SGustavo Padovan } else if (chan->state == BT_CONNECT) { 1418fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 14191c244f79SGustavo Padovan } 14200a708f8fSGustavo F. Padovan 14216be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 14220a708f8fSGustavo F. Padovan } 14230a708f8fSGustavo F. Padovan 14243df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14250a708f8fSGustavo F. Padovan } 14260a708f8fSGustavo F. Padovan 14270a708f8fSGustavo F. Padovan /* Notify sockets that we cannot guaranty reliability anymore */ 14280a708f8fSGustavo F. Padovan static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) 14290a708f8fSGustavo F. Padovan { 143048454079SGustavo F. Padovan struct l2cap_chan *chan; 14310a708f8fSGustavo F. Padovan 14320a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 14330a708f8fSGustavo F. Padovan 14343df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 14350a708f8fSGustavo F. Padovan 14363df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 1437ecf61bdbSAndrei Emeltchenko if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) 14381d8b1fd5SGustavo Padovan l2cap_chan_set_err(chan, err); 14390a708f8fSGustavo F. Padovan } 14400a708f8fSGustavo F. Padovan 14413df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 14420a708f8fSGustavo F. Padovan } 14430a708f8fSGustavo F. Padovan 1444f878fcadSGustavo F. Padovan static void l2cap_info_timeout(struct work_struct *work) 14450a708f8fSGustavo F. Padovan { 1446f878fcadSGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 1447030013d8SGustavo F. Padovan info_timer.work); 14480a708f8fSGustavo F. Padovan 14490a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 14500a708f8fSGustavo F. Padovan conn->info_ident = 0; 14510a708f8fSGustavo F. Padovan 14520a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 14530a708f8fSGustavo F. Padovan } 14540a708f8fSGustavo F. Padovan 14552c8e1411SDavid Herrmann /* 14562c8e1411SDavid Herrmann * l2cap_user 14572c8e1411SDavid Herrmann * External modules can register l2cap_user objects on l2cap_conn. The ->probe 14582c8e1411SDavid Herrmann * callback is called during registration. The ->remove callback is called 14592c8e1411SDavid Herrmann * during unregistration. 14602c8e1411SDavid Herrmann * An l2cap_user object can either be explicitly unregistered or when the 14612c8e1411SDavid Herrmann * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, 14622c8e1411SDavid Herrmann * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. 14632c8e1411SDavid Herrmann * External modules must own a reference to the l2cap_conn object if they intend 14642c8e1411SDavid Herrmann * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at 14652c8e1411SDavid Herrmann * any time if they don't. 14662c8e1411SDavid Herrmann */ 14672c8e1411SDavid Herrmann 14682c8e1411SDavid Herrmann int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) 14692c8e1411SDavid Herrmann { 14702c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 14712c8e1411SDavid Herrmann int ret; 14722c8e1411SDavid Herrmann 14732c8e1411SDavid Herrmann /* We need to check whether l2cap_conn is registered. If it is not, we 14742c8e1411SDavid Herrmann * must not register the l2cap_user. l2cap_conn_del() is unregisters 14752c8e1411SDavid Herrmann * l2cap_conn objects, but doesn't provide its own locking. Instead, it 14762c8e1411SDavid Herrmann * relies on the parent hci_conn object to be locked. This itself relies 14772c8e1411SDavid Herrmann * on the hci_dev object to be locked. So we must lock the hci device 14782c8e1411SDavid Herrmann * here, too. */ 14792c8e1411SDavid Herrmann 14802c8e1411SDavid Herrmann hci_dev_lock(hdev); 14812c8e1411SDavid Herrmann 14822c8e1411SDavid Herrmann if (user->list.next || user->list.prev) { 14832c8e1411SDavid Herrmann ret = -EINVAL; 14842c8e1411SDavid Herrmann goto out_unlock; 14852c8e1411SDavid Herrmann } 14862c8e1411SDavid Herrmann 14872c8e1411SDavid Herrmann /* conn->hchan is NULL after l2cap_conn_del() was called */ 14882c8e1411SDavid Herrmann if (!conn->hchan) { 14892c8e1411SDavid Herrmann ret = -ENODEV; 14902c8e1411SDavid Herrmann goto out_unlock; 14912c8e1411SDavid Herrmann } 14922c8e1411SDavid Herrmann 14932c8e1411SDavid Herrmann ret = user->probe(conn, user); 14942c8e1411SDavid Herrmann if (ret) 14952c8e1411SDavid Herrmann goto out_unlock; 14962c8e1411SDavid Herrmann 14972c8e1411SDavid Herrmann list_add(&user->list, &conn->users); 14982c8e1411SDavid Herrmann ret = 0; 14992c8e1411SDavid Herrmann 15002c8e1411SDavid Herrmann out_unlock: 15012c8e1411SDavid Herrmann hci_dev_unlock(hdev); 15022c8e1411SDavid Herrmann return ret; 15032c8e1411SDavid Herrmann } 15042c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_register_user); 15052c8e1411SDavid Herrmann 15062c8e1411SDavid Herrmann void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) 15072c8e1411SDavid Herrmann { 15082c8e1411SDavid Herrmann struct hci_dev *hdev = conn->hcon->hdev; 15092c8e1411SDavid Herrmann 15102c8e1411SDavid Herrmann hci_dev_lock(hdev); 15112c8e1411SDavid Herrmann 15122c8e1411SDavid Herrmann if (!user->list.next || !user->list.prev) 15132c8e1411SDavid Herrmann goto out_unlock; 15142c8e1411SDavid Herrmann 15152c8e1411SDavid Herrmann list_del(&user->list); 15162c8e1411SDavid Herrmann user->list.next = NULL; 15172c8e1411SDavid Herrmann user->list.prev = NULL; 15182c8e1411SDavid Herrmann user->remove(conn, user); 15192c8e1411SDavid Herrmann 15202c8e1411SDavid Herrmann out_unlock: 15212c8e1411SDavid Herrmann hci_dev_unlock(hdev); 15222c8e1411SDavid Herrmann } 15232c8e1411SDavid Herrmann EXPORT_SYMBOL(l2cap_unregister_user); 15242c8e1411SDavid Herrmann 15252c8e1411SDavid Herrmann static void l2cap_unregister_all_users(struct l2cap_conn *conn) 15262c8e1411SDavid Herrmann { 15272c8e1411SDavid Herrmann struct l2cap_user *user; 15282c8e1411SDavid Herrmann 15292c8e1411SDavid Herrmann while (!list_empty(&conn->users)) { 15302c8e1411SDavid Herrmann user = list_first_entry(&conn->users, struct l2cap_user, list); 15312c8e1411SDavid Herrmann list_del(&user->list); 15322c8e1411SDavid Herrmann user->list.next = NULL; 15332c8e1411SDavid Herrmann user->list.prev = NULL; 15342c8e1411SDavid Herrmann user->remove(conn, user); 15352c8e1411SDavid Herrmann } 15362c8e1411SDavid Herrmann } 15372c8e1411SDavid Herrmann 15385d3de7dfSVinicius Costa Gomes static void l2cap_conn_del(struct hci_conn *hcon, int err) 15395d3de7dfSVinicius Costa Gomes { 15405d3de7dfSVinicius Costa Gomes struct l2cap_conn *conn = hcon->l2cap_data; 15415d3de7dfSVinicius Costa Gomes struct l2cap_chan *chan, *l; 15425d3de7dfSVinicius Costa Gomes 15435d3de7dfSVinicius Costa Gomes if (!conn) 15445d3de7dfSVinicius Costa Gomes return; 15455d3de7dfSVinicius Costa Gomes 15465d3de7dfSVinicius Costa Gomes BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 15475d3de7dfSVinicius Costa Gomes 15485d3de7dfSVinicius Costa Gomes kfree_skb(conn->rx_skb); 15495d3de7dfSVinicius Costa Gomes 15502c8e1411SDavid Herrmann l2cap_unregister_all_users(conn); 15512c8e1411SDavid Herrmann 15523df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 15533df91ea2SAndrei Emeltchenko 15545d3de7dfSVinicius Costa Gomes /* Kill channels */ 15555d3de7dfSVinicius Costa Gomes list_for_each_entry_safe(chan, l, &conn->chan_l, list) { 155661d6ef3eSMat Martineau l2cap_chan_hold(chan); 15576be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 15586be36555SAndrei Emeltchenko 15595d3de7dfSVinicius Costa Gomes l2cap_chan_del(chan, err); 15606be36555SAndrei Emeltchenko 15616be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 15626be36555SAndrei Emeltchenko 156380b98027SGustavo Padovan chan->ops->close(chan); 156461d6ef3eSMat Martineau l2cap_chan_put(chan); 15655d3de7dfSVinicius Costa Gomes } 15665d3de7dfSVinicius Costa Gomes 15673df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 15683df91ea2SAndrei Emeltchenko 156973d80debSLuiz Augusto von Dentz hci_chan_del(conn->hchan); 157073d80debSLuiz Augusto von Dentz 15715d3de7dfSVinicius Costa Gomes if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) 1572127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->info_timer); 15735d3de7dfSVinicius Costa Gomes 157451a8efd7SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { 1575127074bfSUlisses Furquim cancel_delayed_work_sync(&conn->security_timer); 15768aab4757SVinicius Costa Gomes smp_chan_destroy(conn); 1577d26a2345SVinicius Costa Gomes } 15785d3de7dfSVinicius Costa Gomes 15795d3de7dfSVinicius Costa Gomes hcon->l2cap_data = NULL; 15809c903e37SDavid Herrmann conn->hchan = NULL; 15819c903e37SDavid Herrmann l2cap_conn_put(conn); 15825d3de7dfSVinicius Costa Gomes } 15835d3de7dfSVinicius Costa Gomes 15846c9d42a1SGustavo F. Padovan static void security_timeout(struct work_struct *work) 15855d3de7dfSVinicius Costa Gomes { 15866c9d42a1SGustavo F. Padovan struct l2cap_conn *conn = container_of(work, struct l2cap_conn, 15876c9d42a1SGustavo F. Padovan security_timer.work); 15885d3de7dfSVinicius Costa Gomes 1589d06cc416SJohan Hedberg BT_DBG("conn %p", conn); 1590d06cc416SJohan Hedberg 1591d06cc416SJohan Hedberg if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { 1592d06cc416SJohan Hedberg smp_chan_destroy(conn); 15935d3de7dfSVinicius Costa Gomes l2cap_conn_del(conn->hcon, ETIMEDOUT); 15945d3de7dfSVinicius Costa Gomes } 1595d06cc416SJohan Hedberg } 15965d3de7dfSVinicius Costa Gomes 1597baf43251SClaudio Takahasi static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) 15980a708f8fSGustavo F. Padovan { 15990a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 160073d80debSLuiz Augusto von Dentz struct hci_chan *hchan; 16010a708f8fSGustavo F. Padovan 1602baf43251SClaudio Takahasi if (conn) 16030a708f8fSGustavo F. Padovan return conn; 16040a708f8fSGustavo F. Padovan 160573d80debSLuiz Augusto von Dentz hchan = hci_chan_create(hcon); 160673d80debSLuiz Augusto von Dentz if (!hchan) 16070a708f8fSGustavo F. Padovan return NULL; 16080a708f8fSGustavo F. Padovan 16098bcde1f2SGustavo Padovan conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); 161073d80debSLuiz Augusto von Dentz if (!conn) { 161173d80debSLuiz Augusto von Dentz hci_chan_del(hchan); 161273d80debSLuiz Augusto von Dentz return NULL; 161373d80debSLuiz Augusto von Dentz } 161473d80debSLuiz Augusto von Dentz 16159c903e37SDavid Herrmann kref_init(&conn->ref); 16160a708f8fSGustavo F. Padovan hcon->l2cap_data = conn; 16170a708f8fSGustavo F. Padovan conn->hcon = hcon; 16189c903e37SDavid Herrmann hci_conn_get(conn->hcon); 161973d80debSLuiz Augusto von Dentz conn->hchan = hchan; 16200a708f8fSGustavo F. Padovan 162173d80debSLuiz Augusto von Dentz BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); 16220a708f8fSGustavo F. Padovan 1623dcc042d5SAndrei Emeltchenko switch (hcon->type) { 1624dcc042d5SAndrei Emeltchenko case LE_LINK: 1625dcc042d5SAndrei Emeltchenko if (hcon->hdev->le_mtu) { 1626acd7d370SVille Tervo conn->mtu = hcon->hdev->le_mtu; 1627dcc042d5SAndrei Emeltchenko break; 1628dcc042d5SAndrei Emeltchenko } 1629dcc042d5SAndrei Emeltchenko /* fall through */ 1630dcc042d5SAndrei Emeltchenko default: 16310a708f8fSGustavo F. Padovan conn->mtu = hcon->hdev->acl_mtu; 1632dcc042d5SAndrei Emeltchenko break; 1633dcc042d5SAndrei Emeltchenko } 1634acd7d370SVille Tervo 16350a708f8fSGustavo F. Padovan conn->src = &hcon->hdev->bdaddr; 16360a708f8fSGustavo F. Padovan conn->dst = &hcon->dst; 16370a708f8fSGustavo F. Padovan 16380a708f8fSGustavo F. Padovan conn->feat_mask = 0; 16390a708f8fSGustavo F. Padovan 1640848566b3SMarcel Holtmann if (hcon->type == ACL_LINK) 1641848566b3SMarcel Holtmann conn->hs_enabled = test_bit(HCI_HS_ENABLED, 1642848566b3SMarcel Holtmann &hcon->hdev->dev_flags); 1643848566b3SMarcel Holtmann 16440a708f8fSGustavo F. Padovan spin_lock_init(&conn->lock); 16453df91ea2SAndrei Emeltchenko mutex_init(&conn->chan_lock); 1646baa7e1faSGustavo F. Padovan 1647baa7e1faSGustavo F. Padovan INIT_LIST_HEAD(&conn->chan_l); 16482c8e1411SDavid Herrmann INIT_LIST_HEAD(&conn->users); 16490a708f8fSGustavo F. Padovan 16505d3de7dfSVinicius Costa Gomes if (hcon->type == LE_LINK) 16516c9d42a1SGustavo F. Padovan INIT_DELAYED_WORK(&conn->security_timer, security_timeout); 16525d3de7dfSVinicius Costa Gomes else 1653030013d8SGustavo F. Padovan INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); 16540a708f8fSGustavo F. Padovan 16559f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; 16560a708f8fSGustavo F. Padovan 16570a708f8fSGustavo F. Padovan return conn; 16580a708f8fSGustavo F. Padovan } 16590a708f8fSGustavo F. Padovan 16609c903e37SDavid Herrmann static void l2cap_conn_free(struct kref *ref) 16619c903e37SDavid Herrmann { 16629c903e37SDavid Herrmann struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); 16639c903e37SDavid Herrmann 16649c903e37SDavid Herrmann hci_conn_put(conn->hcon); 16659c903e37SDavid Herrmann kfree(conn); 16669c903e37SDavid Herrmann } 16679c903e37SDavid Herrmann 16689c903e37SDavid Herrmann void l2cap_conn_get(struct l2cap_conn *conn) 16699c903e37SDavid Herrmann { 16709c903e37SDavid Herrmann kref_get(&conn->ref); 16719c903e37SDavid Herrmann } 16729c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_get); 16739c903e37SDavid Herrmann 16749c903e37SDavid Herrmann void l2cap_conn_put(struct l2cap_conn *conn) 16759c903e37SDavid Herrmann { 16769c903e37SDavid Herrmann kref_put(&conn->ref, l2cap_conn_free); 16779c903e37SDavid Herrmann } 16789c903e37SDavid Herrmann EXPORT_SYMBOL(l2cap_conn_put); 16799c903e37SDavid Herrmann 16800a708f8fSGustavo F. Padovan /* ---- Socket interface ---- */ 16810a708f8fSGustavo F. Padovan 1682c2287681SIdo Yariv /* Find socket with psm and source / destination bdaddr. 16830a708f8fSGustavo F. Padovan * Returns closest match. 16840a708f8fSGustavo F. Padovan */ 1685c2287681SIdo Yariv static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, 1686c2287681SIdo Yariv bdaddr_t *src, 1687c2287681SIdo Yariv bdaddr_t *dst) 16880a708f8fSGustavo F. Padovan { 168923691d75SGustavo F. Padovan struct l2cap_chan *c, *c1 = NULL; 16900a708f8fSGustavo F. Padovan 169123691d75SGustavo F. Padovan read_lock(&chan_list_lock); 16920a708f8fSGustavo F. Padovan 169323691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 169423691d75SGustavo F. Padovan struct sock *sk = c->sk; 1695fe4128e0SGustavo F. Padovan 169689bc500eSGustavo F. Padovan if (state && c->state != state) 16970a708f8fSGustavo F. Padovan continue; 16980a708f8fSGustavo F. Padovan 169923691d75SGustavo F. Padovan if (c->psm == psm) { 1700c2287681SIdo Yariv int src_match, dst_match; 1701c2287681SIdo Yariv int src_any, dst_any; 1702c2287681SIdo Yariv 17030a708f8fSGustavo F. Padovan /* Exact match. */ 1704c2287681SIdo Yariv src_match = !bacmp(&bt_sk(sk)->src, src); 1705c2287681SIdo Yariv dst_match = !bacmp(&bt_sk(sk)->dst, dst); 1706c2287681SIdo Yariv if (src_match && dst_match) { 1707a7567b20SJohannes Berg read_unlock(&chan_list_lock); 170823691d75SGustavo F. Padovan return c; 170923691d75SGustavo F. Padovan } 17100a708f8fSGustavo F. Padovan 17110a708f8fSGustavo F. Padovan /* Closest match */ 1712c2287681SIdo Yariv src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); 1713c2287681SIdo Yariv dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); 1714c2287681SIdo Yariv if ((src_match && dst_any) || (src_any && dst_match) || 1715c2287681SIdo Yariv (src_any && dst_any)) 171623691d75SGustavo F. Padovan c1 = c; 17170a708f8fSGustavo F. Padovan } 17180a708f8fSGustavo F. Padovan } 17190a708f8fSGustavo F. Padovan 172023691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 17210a708f8fSGustavo F. Padovan 172223691d75SGustavo F. Padovan return c1; 17230a708f8fSGustavo F. Padovan } 17240a708f8fSGustavo F. Padovan 17258e9f9892SAndre Guedes int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, 17268e9f9892SAndre Guedes bdaddr_t *dst, u8 dst_type) 17270a708f8fSGustavo F. Padovan { 17285d41ce1dSGustavo F. Padovan struct sock *sk = chan->sk; 17290a708f8fSGustavo F. Padovan bdaddr_t *src = &bt_sk(sk)->src; 17300a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 17310a708f8fSGustavo F. Padovan struct hci_conn *hcon; 17320a708f8fSGustavo F. Padovan struct hci_dev *hdev; 17330a708f8fSGustavo F. Padovan __u8 auth_type; 17340a708f8fSGustavo F. Padovan int err; 17350a708f8fSGustavo F. Padovan 17366ed93dc6SAndrei Emeltchenko BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, 1737ab19516aSSyam Sidhardhan dst_type, __le16_to_cpu(psm)); 17380a708f8fSGustavo F. Padovan 17390a708f8fSGustavo F. Padovan hdev = hci_get_route(dst, src); 17400a708f8fSGustavo F. Padovan if (!hdev) 17410a708f8fSGustavo F. Padovan return -EHOSTUNREACH; 17420a708f8fSGustavo F. Padovan 174309fd0de5SGustavo F. Padovan hci_dev_lock(hdev); 17440a708f8fSGustavo F. Padovan 17456be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 174603a00194SGustavo F. Padovan 174703a00194SGustavo F. Padovan /* PSM must be odd and lsb of upper byte must be 0 */ 174803a00194SGustavo F. Padovan if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && 174903a00194SGustavo F. Padovan chan->chan_type != L2CAP_CHAN_RAW) { 175003a00194SGustavo F. Padovan err = -EINVAL; 175103a00194SGustavo F. Padovan goto done; 175203a00194SGustavo F. Padovan } 175303a00194SGustavo F. Padovan 175403a00194SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { 175503a00194SGustavo F. Padovan err = -EINVAL; 175603a00194SGustavo F. Padovan goto done; 175703a00194SGustavo F. Padovan } 175803a00194SGustavo F. Padovan 175903a00194SGustavo F. Padovan switch (chan->mode) { 176003a00194SGustavo F. Padovan case L2CAP_MODE_BASIC: 176103a00194SGustavo F. Padovan break; 176203a00194SGustavo F. Padovan case L2CAP_MODE_ERTM: 176303a00194SGustavo F. Padovan case L2CAP_MODE_STREAMING: 176403a00194SGustavo F. Padovan if (!disable_ertm) 176503a00194SGustavo F. Padovan break; 176603a00194SGustavo F. Padovan /* fall through */ 176703a00194SGustavo F. Padovan default: 176803a00194SGustavo F. Padovan err = -ENOTSUPP; 176903a00194SGustavo F. Padovan goto done; 177003a00194SGustavo F. Padovan } 177103a00194SGustavo F. Padovan 17720797e01dSGustavo Padovan switch (chan->state) { 177303a00194SGustavo F. Padovan case BT_CONNECT: 177403a00194SGustavo F. Padovan case BT_CONNECT2: 177503a00194SGustavo F. Padovan case BT_CONFIG: 177603a00194SGustavo F. Padovan /* Already connecting */ 177703a00194SGustavo F. Padovan err = 0; 177803a00194SGustavo F. Padovan goto done; 177903a00194SGustavo F. Padovan 178003a00194SGustavo F. Padovan case BT_CONNECTED: 178103a00194SGustavo F. Padovan /* Already connected */ 178203a00194SGustavo F. Padovan err = -EISCONN; 178303a00194SGustavo F. Padovan goto done; 178403a00194SGustavo F. Padovan 178503a00194SGustavo F. Padovan case BT_OPEN: 178603a00194SGustavo F. Padovan case BT_BOUND: 178703a00194SGustavo F. Padovan /* Can connect */ 178803a00194SGustavo F. Padovan break; 178903a00194SGustavo F. Padovan 179003a00194SGustavo F. Padovan default: 179103a00194SGustavo F. Padovan err = -EBADFD; 179203a00194SGustavo F. Padovan goto done; 179303a00194SGustavo F. Padovan } 179403a00194SGustavo F. Padovan 179503a00194SGustavo F. Padovan /* Set destination address and psm */ 17960797e01dSGustavo Padovan lock_sock(sk); 17979219b2a0SGustavo F. Padovan bacpy(&bt_sk(sk)->dst, dst); 17986be36555SAndrei Emeltchenko release_sock(sk); 17996be36555SAndrei Emeltchenko 180003a00194SGustavo F. Padovan chan->psm = psm; 180103a00194SGustavo F. Padovan chan->dcid = cid; 18020a708f8fSGustavo F. Padovan 18034343478fSGustavo F. Padovan auth_type = l2cap_get_auth_type(chan); 18040a708f8fSGustavo F. Padovan 1805f224ca5fSJohan Hedberg if (bdaddr_type_is_le(dst_type)) 18068e9f9892SAndre Guedes hcon = hci_connect(hdev, LE_LINK, dst, dst_type, 18074343478fSGustavo F. Padovan chan->sec_level, auth_type); 1808acd7d370SVille Tervo else 18098e9f9892SAndre Guedes hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, 18104343478fSGustavo F. Padovan chan->sec_level, auth_type); 1811acd7d370SVille Tervo 181230e76272SVille Tervo if (IS_ERR(hcon)) { 181330e76272SVille Tervo err = PTR_ERR(hcon); 18140a708f8fSGustavo F. Padovan goto done; 181530e76272SVille Tervo } 18160a708f8fSGustavo F. Padovan 1817baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 18180a708f8fSGustavo F. Padovan if (!conn) { 181976a68ba0SDavid Herrmann hci_conn_drop(hcon); 182030e76272SVille Tervo err = -ENOMEM; 18210a708f8fSGustavo F. Padovan goto done; 18220a708f8fSGustavo F. Padovan } 18230a708f8fSGustavo F. Padovan 1824141d5706SJohan Hedberg if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { 182576a68ba0SDavid Herrmann hci_conn_drop(hcon); 1826141d5706SJohan Hedberg err = -EBUSY; 18279f0caeb1SVinicius Costa Gomes goto done; 18289f0caeb1SVinicius Costa Gomes } 18299f0caeb1SVinicius Costa Gomes 18300a708f8fSGustavo F. Padovan /* Update source addr of the socket */ 18310a708f8fSGustavo F. Padovan bacpy(src, conn->src); 18320a708f8fSGustavo F. Padovan 18336be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 183448454079SGustavo F. Padovan l2cap_chan_add(conn, chan); 18356be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 183648454079SGustavo F. Padovan 18375ee9891dSJohan Hedberg /* l2cap_chan_add takes its own ref so we can drop this one */ 18385ee9891dSJohan Hedberg hci_conn_drop(hcon); 18395ee9891dSJohan Hedberg 18406be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECT); 1841c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 18420a708f8fSGustavo F. Padovan 18430a708f8fSGustavo F. Padovan if (hcon->state == BT_CONNECTED) { 1844715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { 1845c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 1846d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) 18476be36555SAndrei Emeltchenko l2cap_state_change(chan, BT_CONNECTED); 18480a708f8fSGustavo F. Padovan } else 1849fc7f8a7eSGustavo F. Padovan l2cap_do_start(chan); 18500a708f8fSGustavo F. Padovan } 18510a708f8fSGustavo F. Padovan 185230e76272SVille Tervo err = 0; 185330e76272SVille Tervo 18540a708f8fSGustavo F. Padovan done: 18556be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 185609fd0de5SGustavo F. Padovan hci_dev_unlock(hdev); 18570a708f8fSGustavo F. Padovan hci_dev_put(hdev); 18580a708f8fSGustavo F. Padovan return err; 18590a708f8fSGustavo F. Padovan } 18600a708f8fSGustavo F. Padovan 1861dcba0dbaSGustavo F. Padovan int __l2cap_wait_ack(struct sock *sk) 18620a708f8fSGustavo F. Padovan { 18638c1d787bSGustavo F. Padovan struct l2cap_chan *chan = l2cap_pi(sk)->chan; 18640a708f8fSGustavo F. Padovan DECLARE_WAITQUEUE(wait, current); 18650a708f8fSGustavo F. Padovan int err = 0; 18660a708f8fSGustavo F. Padovan int timeo = HZ/5; 18670a708f8fSGustavo F. Padovan 18680a708f8fSGustavo F. Padovan add_wait_queue(sk_sleep(sk), &wait); 18690a708f8fSGustavo F. Padovan set_current_state(TASK_INTERRUPTIBLE); 1870a71a0cf4SPeter Hurley while (chan->unacked_frames > 0 && chan->conn) { 18710a708f8fSGustavo F. Padovan if (!timeo) 18720a708f8fSGustavo F. Padovan timeo = HZ/5; 18730a708f8fSGustavo F. Padovan 18740a708f8fSGustavo F. Padovan if (signal_pending(current)) { 18750a708f8fSGustavo F. Padovan err = sock_intr_errno(timeo); 18760a708f8fSGustavo F. Padovan break; 18770a708f8fSGustavo F. Padovan } 18780a708f8fSGustavo F. Padovan 18790a708f8fSGustavo F. Padovan release_sock(sk); 18800a708f8fSGustavo F. Padovan timeo = schedule_timeout(timeo); 18810a708f8fSGustavo F. Padovan lock_sock(sk); 1882a71a0cf4SPeter Hurley set_current_state(TASK_INTERRUPTIBLE); 18830a708f8fSGustavo F. Padovan 18840a708f8fSGustavo F. Padovan err = sock_error(sk); 18850a708f8fSGustavo F. Padovan if (err) 18860a708f8fSGustavo F. Padovan break; 18870a708f8fSGustavo F. Padovan } 18880a708f8fSGustavo F. Padovan set_current_state(TASK_RUNNING); 18890a708f8fSGustavo F. Padovan remove_wait_queue(sk_sleep(sk), &wait); 18900a708f8fSGustavo F. Padovan return err; 18910a708f8fSGustavo F. Padovan } 18920a708f8fSGustavo F. Padovan 1893721c4181SGustavo F. Padovan static void l2cap_monitor_timeout(struct work_struct *work) 18940a708f8fSGustavo F. Padovan { 1895721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1896721c4181SGustavo F. Padovan monitor_timer.work); 18970a708f8fSGustavo F. Padovan 1898525cd185SGustavo F. Padovan BT_DBG("chan %p", chan); 18990a708f8fSGustavo F. Padovan 19006be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 19016be36555SAndrei Emeltchenko 190280909e04SMat Martineau if (!chan->conn) { 19036be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 19048d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 19050a708f8fSGustavo F. Padovan return; 19060a708f8fSGustavo F. Padovan } 19070a708f8fSGustavo F. Padovan 1908401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); 19090a708f8fSGustavo F. Padovan 19106be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 19118d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 19120a708f8fSGustavo F. Padovan } 19130a708f8fSGustavo F. Padovan 1914721c4181SGustavo F. Padovan static void l2cap_retrans_timeout(struct work_struct *work) 19150a708f8fSGustavo F. Padovan { 1916721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 1917721c4181SGustavo F. Padovan retrans_timer.work); 19180a708f8fSGustavo F. Padovan 191949208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 19200a708f8fSGustavo F. Padovan 19216be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 19226be36555SAndrei Emeltchenko 192380909e04SMat Martineau if (!chan->conn) { 192480909e04SMat Martineau l2cap_chan_unlock(chan); 192580909e04SMat Martineau l2cap_chan_put(chan); 192680909e04SMat Martineau return; 192780909e04SMat Martineau } 19280a708f8fSGustavo F. Padovan 1929401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); 19306be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 19318d7e1c7fSAndrei Emeltchenko l2cap_chan_put(chan); 19320a708f8fSGustavo F. Padovan } 19330a708f8fSGustavo F. Padovan 1934d660366dSGustavo Padovan static void l2cap_streaming_send(struct l2cap_chan *chan, 19353733937dSMat Martineau struct sk_buff_head *skbs) 19360a708f8fSGustavo F. Padovan { 19370a708f8fSGustavo F. Padovan struct sk_buff *skb; 19383733937dSMat Martineau struct l2cap_ctrl *control; 19390a708f8fSGustavo F. Padovan 19403733937dSMat Martineau BT_DBG("chan %p, skbs %p", chan, skbs); 19413733937dSMat Martineau 1942b99e13adSMat Martineau if (__chan_is_moving(chan)) 1943b99e13adSMat Martineau return; 1944b99e13adSMat Martineau 19453733937dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 19463733937dSMat Martineau 19473733937dSMat Martineau while (!skb_queue_empty(&chan->tx_q)) { 19483733937dSMat Martineau 19493733937dSMat Martineau skb = skb_dequeue(&chan->tx_q); 19503733937dSMat Martineau 19513733937dSMat Martineau bt_cb(skb)->control.retries = 1; 19523733937dSMat Martineau control = &bt_cb(skb)->control; 19533733937dSMat Martineau 19543733937dSMat Martineau control->reqseq = 0; 19553733937dSMat Martineau control->txseq = chan->next_tx_seq; 19563733937dSMat Martineau 19573733937dSMat Martineau __pack_control(chan, control, skb); 19580a708f8fSGustavo F. Padovan 195947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 19603733937dSMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 19613733937dSMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 19620a708f8fSGustavo F. Padovan } 19630a708f8fSGustavo F. Padovan 19644343478fSGustavo F. Padovan l2cap_do_send(chan, skb); 19650a708f8fSGustavo F. Padovan 1966b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 19673733937dSMat Martineau 1968836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 19693733937dSMat Martineau chan->frames_sent++; 19700a708f8fSGustavo F. Padovan } 19710a708f8fSGustavo F. Padovan } 19720a708f8fSGustavo F. Padovan 197367c9e840SSzymon Janc static int l2cap_ertm_send(struct l2cap_chan *chan) 19740a708f8fSGustavo F. Padovan { 19750a708f8fSGustavo F. Padovan struct sk_buff *skb, *tx_skb; 197618a48e76SMat Martineau struct l2cap_ctrl *control; 197718a48e76SMat Martineau int sent = 0; 197818a48e76SMat Martineau 197918a48e76SMat Martineau BT_DBG("chan %p", chan); 19800a708f8fSGustavo F. Padovan 198189bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 19820a708f8fSGustavo F. Padovan return -ENOTCONN; 19830a708f8fSGustavo F. Padovan 198494122bbeSMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 198594122bbeSMat Martineau return 0; 198694122bbeSMat Martineau 1987b99e13adSMat Martineau if (__chan_is_moving(chan)) 1988b99e13adSMat Martineau return 0; 1989b99e13adSMat Martineau 199018a48e76SMat Martineau while (chan->tx_send_head && 199118a48e76SMat Martineau chan->unacked_frames < chan->remote_tx_win && 199218a48e76SMat Martineau chan->tx_state == L2CAP_TX_STATE_XMIT) { 19930a708f8fSGustavo F. Padovan 199418a48e76SMat Martineau skb = chan->tx_send_head; 19950a708f8fSGustavo F. Padovan 199618a48e76SMat Martineau bt_cb(skb)->control.retries = 1; 199718a48e76SMat Martineau control = &bt_cb(skb)->control; 19980a708f8fSGustavo F. Padovan 1999e2ab4353SGustavo F. Padovan if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 200018a48e76SMat Martineau control->final = 1; 2001e2ab4353SGustavo F. Padovan 200218a48e76SMat Martineau control->reqseq = chan->buffer_seq; 200318a48e76SMat Martineau chan->last_acked_seq = chan->buffer_seq; 200418a48e76SMat Martineau control->txseq = chan->next_tx_seq; 20050a708f8fSGustavo F. Padovan 200618a48e76SMat Martineau __pack_control(chan, control, skb); 20070a708f8fSGustavo F. Padovan 200847d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 200918a48e76SMat Martineau u16 fcs = crc16(0, (u8 *) skb->data, skb->len); 201018a48e76SMat Martineau put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); 20110a708f8fSGustavo F. Padovan } 20120a708f8fSGustavo F. Padovan 201318a48e76SMat Martineau /* Clone after data has been modified. Data is assumed to be 201418a48e76SMat Martineau read-only (for locking purposes) on cloned sk_buffs. 201518a48e76SMat Martineau */ 201618a48e76SMat Martineau tx_skb = skb_clone(skb, GFP_KERNEL); 201718a48e76SMat Martineau 201818a48e76SMat Martineau if (!tx_skb) 201918a48e76SMat Martineau break; 20200a708f8fSGustavo F. Padovan 20211a09bcb9SGustavo F. Padovan __set_retrans_timer(chan); 20220a708f8fSGustavo F. Padovan 2023836be934SAndrei Emeltchenko chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); 20246a026610SGustavo F. Padovan chan->unacked_frames++; 20256a026610SGustavo F. Padovan chan->frames_sent++; 202618a48e76SMat Martineau sent++; 20270a708f8fSGustavo F. Padovan 202858d35f87SGustavo F. Padovan if (skb_queue_is_last(&chan->tx_q, skb)) 202958d35f87SGustavo F. Padovan chan->tx_send_head = NULL; 20300a708f8fSGustavo F. Padovan else 203158d35f87SGustavo F. Padovan chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); 203218a48e76SMat Martineau 203318a48e76SMat Martineau l2cap_do_send(chan, tx_skb); 2034b4400672SAndrei Emeltchenko BT_DBG("Sent txseq %u", control->txseq); 20350a708f8fSGustavo F. Padovan } 20360a708f8fSGustavo F. Padovan 2037b4400672SAndrei Emeltchenko BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, 2038b4400672SAndrei Emeltchenko chan->unacked_frames, skb_queue_len(&chan->tx_q)); 203918a48e76SMat Martineau 204018a48e76SMat Martineau return sent; 20410a708f8fSGustavo F. Padovan } 20420a708f8fSGustavo F. Padovan 2043e1fbd4c1SMat Martineau static void l2cap_ertm_resend(struct l2cap_chan *chan) 2044e1fbd4c1SMat Martineau { 2045e1fbd4c1SMat Martineau struct l2cap_ctrl control; 2046e1fbd4c1SMat Martineau struct sk_buff *skb; 2047e1fbd4c1SMat Martineau struct sk_buff *tx_skb; 2048e1fbd4c1SMat Martineau u16 seq; 2049e1fbd4c1SMat Martineau 2050e1fbd4c1SMat Martineau BT_DBG("chan %p", chan); 2051e1fbd4c1SMat Martineau 2052e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 2053e1fbd4c1SMat Martineau return; 2054e1fbd4c1SMat Martineau 2055b99e13adSMat Martineau if (__chan_is_moving(chan)) 2056b99e13adSMat Martineau return; 2057b99e13adSMat Martineau 2058e1fbd4c1SMat Martineau while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { 2059e1fbd4c1SMat Martineau seq = l2cap_seq_list_pop(&chan->retrans_list); 2060e1fbd4c1SMat Martineau 2061e1fbd4c1SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); 2062e1fbd4c1SMat Martineau if (!skb) { 2063e1fbd4c1SMat Martineau BT_DBG("Error: Can't retransmit seq %d, frame missing", 2064e1fbd4c1SMat Martineau seq); 2065e1fbd4c1SMat Martineau continue; 2066e1fbd4c1SMat Martineau } 2067e1fbd4c1SMat Martineau 2068e1fbd4c1SMat Martineau bt_cb(skb)->control.retries++; 2069e1fbd4c1SMat Martineau control = bt_cb(skb)->control; 2070e1fbd4c1SMat Martineau 2071e1fbd4c1SMat Martineau if (chan->max_tx != 0 && 2072e1fbd4c1SMat Martineau bt_cb(skb)->control.retries > chan->max_tx) { 2073e1fbd4c1SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 20745e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 2075e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2076e1fbd4c1SMat Martineau break; 2077e1fbd4c1SMat Martineau } 2078e1fbd4c1SMat Martineau 2079e1fbd4c1SMat Martineau control.reqseq = chan->buffer_seq; 2080e1fbd4c1SMat Martineau if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) 2081e1fbd4c1SMat Martineau control.final = 1; 2082e1fbd4c1SMat Martineau else 2083e1fbd4c1SMat Martineau control.final = 0; 2084e1fbd4c1SMat Martineau 2085e1fbd4c1SMat Martineau if (skb_cloned(skb)) { 2086e1fbd4c1SMat Martineau /* Cloned sk_buffs are read-only, so we need a 2087e1fbd4c1SMat Martineau * writeable copy 2088e1fbd4c1SMat Martineau */ 20898bcde1f2SGustavo Padovan tx_skb = skb_copy(skb, GFP_KERNEL); 2090e1fbd4c1SMat Martineau } else { 20918bcde1f2SGustavo Padovan tx_skb = skb_clone(skb, GFP_KERNEL); 2092e1fbd4c1SMat Martineau } 2093e1fbd4c1SMat Martineau 2094e1fbd4c1SMat Martineau if (!tx_skb) { 2095e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2096e1fbd4c1SMat Martineau break; 2097e1fbd4c1SMat Martineau } 2098e1fbd4c1SMat Martineau 2099e1fbd4c1SMat Martineau /* Update skb contents */ 2100e1fbd4c1SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { 2101e1fbd4c1SMat Martineau put_unaligned_le32(__pack_extended_control(&control), 2102e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2103e1fbd4c1SMat Martineau } else { 2104e1fbd4c1SMat Martineau put_unaligned_le16(__pack_enhanced_control(&control), 2105e1fbd4c1SMat Martineau tx_skb->data + L2CAP_HDR_SIZE); 2106e1fbd4c1SMat Martineau } 2107e1fbd4c1SMat Martineau 2108e1fbd4c1SMat Martineau if (chan->fcs == L2CAP_FCS_CRC16) { 2109e1fbd4c1SMat Martineau u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); 2110e1fbd4c1SMat Martineau put_unaligned_le16(fcs, skb_put(tx_skb, 2111e1fbd4c1SMat Martineau L2CAP_FCS_SIZE)); 2112e1fbd4c1SMat Martineau } 2113e1fbd4c1SMat Martineau 2114e1fbd4c1SMat Martineau l2cap_do_send(chan, tx_skb); 2115e1fbd4c1SMat Martineau 2116e1fbd4c1SMat Martineau BT_DBG("Resent txseq %d", control.txseq); 2117e1fbd4c1SMat Martineau 2118e1fbd4c1SMat Martineau chan->last_acked_seq = chan->buffer_seq; 2119e1fbd4c1SMat Martineau } 2120e1fbd4c1SMat Martineau } 2121e1fbd4c1SMat Martineau 2122f80842a8SMat Martineau static void l2cap_retransmit(struct l2cap_chan *chan, 2123f80842a8SMat Martineau struct l2cap_ctrl *control) 2124f80842a8SMat Martineau { 2125f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2126f80842a8SMat Martineau 2127f80842a8SMat Martineau l2cap_seq_list_append(&chan->retrans_list, control->reqseq); 2128f80842a8SMat Martineau l2cap_ertm_resend(chan); 2129f80842a8SMat Martineau } 2130f80842a8SMat Martineau 2131d2a7ac5dSMat Martineau static void l2cap_retransmit_all(struct l2cap_chan *chan, 2132d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 2133d2a7ac5dSMat Martineau { 2134e1fbd4c1SMat Martineau struct sk_buff *skb; 2135e1fbd4c1SMat Martineau 2136e1fbd4c1SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2137e1fbd4c1SMat Martineau 2138e1fbd4c1SMat Martineau if (control->poll) 2139e1fbd4c1SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 2140e1fbd4c1SMat Martineau 2141e1fbd4c1SMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 2142e1fbd4c1SMat Martineau 2143e1fbd4c1SMat Martineau if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) 2144e1fbd4c1SMat Martineau return; 2145e1fbd4c1SMat Martineau 2146e1fbd4c1SMat Martineau if (chan->unacked_frames) { 2147e1fbd4c1SMat Martineau skb_queue_walk(&chan->tx_q, skb) { 2148e1fbd4c1SMat Martineau if (bt_cb(skb)->control.txseq == control->reqseq || 2149e1fbd4c1SMat Martineau skb == chan->tx_send_head) 2150e1fbd4c1SMat Martineau break; 2151e1fbd4c1SMat Martineau } 2152e1fbd4c1SMat Martineau 2153e1fbd4c1SMat Martineau skb_queue_walk_from(&chan->tx_q, skb) { 2154e1fbd4c1SMat Martineau if (skb == chan->tx_send_head) 2155e1fbd4c1SMat Martineau break; 2156e1fbd4c1SMat Martineau 2157e1fbd4c1SMat Martineau l2cap_seq_list_append(&chan->retrans_list, 2158e1fbd4c1SMat Martineau bt_cb(skb)->control.txseq); 2159e1fbd4c1SMat Martineau } 2160e1fbd4c1SMat Martineau 2161e1fbd4c1SMat Martineau l2cap_ertm_resend(chan); 2162e1fbd4c1SMat Martineau } 2163d2a7ac5dSMat Martineau } 2164d2a7ac5dSMat Martineau 2165b17e73bbSSzymon Janc static void l2cap_send_ack(struct l2cap_chan *chan) 2166b17e73bbSSzymon Janc { 21670a0aba42SMat Martineau struct l2cap_ctrl control; 21680a0aba42SMat Martineau u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, 21690a0aba42SMat Martineau chan->last_acked_seq); 21700a0aba42SMat Martineau int threshold; 21710a0aba42SMat Martineau 21720a0aba42SMat Martineau BT_DBG("chan %p last_acked_seq %d buffer_seq %d", 21730a0aba42SMat Martineau chan, chan->last_acked_seq, chan->buffer_seq); 21740a0aba42SMat Martineau 21750a0aba42SMat Martineau memset(&control, 0, sizeof(control)); 21760a0aba42SMat Martineau control.sframe = 1; 21770a0aba42SMat Martineau 21780a0aba42SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 21790a0aba42SMat Martineau chan->rx_state == L2CAP_RX_STATE_RECV) { 2180b17e73bbSSzymon Janc __clear_ack_timer(chan); 21810a0aba42SMat Martineau control.super = L2CAP_SUPER_RNR; 21820a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 21830a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 21840a0aba42SMat Martineau } else { 21850a0aba42SMat Martineau if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { 21860a0aba42SMat Martineau l2cap_ertm_send(chan); 21870a0aba42SMat Martineau /* If any i-frames were sent, they included an ack */ 21880a0aba42SMat Martineau if (chan->buffer_seq == chan->last_acked_seq) 21890a0aba42SMat Martineau frames_to_ack = 0; 21900a0aba42SMat Martineau } 21910a0aba42SMat Martineau 2192c20f8e35SMat Martineau /* Ack now if the window is 3/4ths full. 21930a0aba42SMat Martineau * Calculate without mul or div 21940a0aba42SMat Martineau */ 2195c20f8e35SMat Martineau threshold = chan->ack_win; 21960a0aba42SMat Martineau threshold += threshold << 1; 21970a0aba42SMat Martineau threshold >>= 2; 21980a0aba42SMat Martineau 2199b4400672SAndrei Emeltchenko BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, 22000a0aba42SMat Martineau threshold); 22010a0aba42SMat Martineau 22020a0aba42SMat Martineau if (frames_to_ack >= threshold) { 22030a0aba42SMat Martineau __clear_ack_timer(chan); 22040a0aba42SMat Martineau control.super = L2CAP_SUPER_RR; 22050a0aba42SMat Martineau control.reqseq = chan->buffer_seq; 22060a0aba42SMat Martineau l2cap_send_sframe(chan, &control); 22070a0aba42SMat Martineau frames_to_ack = 0; 22080a0aba42SMat Martineau } 22090a0aba42SMat Martineau 22100a0aba42SMat Martineau if (frames_to_ack) 22110a0aba42SMat Martineau __set_ack_timer(chan); 22120a0aba42SMat Martineau } 2213b17e73bbSSzymon Janc } 2214b17e73bbSSzymon Janc 221504124681SGustavo F. Padovan static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, 221604124681SGustavo F. Padovan struct msghdr *msg, int len, 221704124681SGustavo F. Padovan int count, struct sk_buff *skb) 22180a708f8fSGustavo F. Padovan { 22190952a57aSAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 22200a708f8fSGustavo F. Padovan struct sk_buff **frag; 222190338947SGustavo Padovan int sent = 0; 22220a708f8fSGustavo F. Padovan 22230a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) 22240a708f8fSGustavo F. Padovan return -EFAULT; 22250a708f8fSGustavo F. Padovan 22260a708f8fSGustavo F. Padovan sent += count; 22270a708f8fSGustavo F. Padovan len -= count; 22280a708f8fSGustavo F. Padovan 22290a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 22300a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 22310a708f8fSGustavo F. Padovan while (len) { 2232fbe00700SGustavo Padovan struct sk_buff *tmp; 2233fbe00700SGustavo Padovan 22340a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 22350a708f8fSGustavo F. Padovan 2236fbe00700SGustavo Padovan tmp = chan->ops->alloc_skb(chan, count, 223790338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 2238fbe00700SGustavo Padovan if (IS_ERR(tmp)) 2239fbe00700SGustavo Padovan return PTR_ERR(tmp); 22402f7719ceSAndrei Emeltchenko 2241fbe00700SGustavo Padovan *frag = tmp; 2242fbe00700SGustavo Padovan 22430a708f8fSGustavo F. Padovan if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) 22440a708f8fSGustavo F. Padovan return -EFAULT; 22450a708f8fSGustavo F. Padovan 22465e59b791SLuiz Augusto von Dentz (*frag)->priority = skb->priority; 22475e59b791SLuiz Augusto von Dentz 22480a708f8fSGustavo F. Padovan sent += count; 22490a708f8fSGustavo F. Padovan len -= count; 22500a708f8fSGustavo F. Padovan 22512d0ed3d5SGustavo Padovan skb->len += (*frag)->len; 22522d0ed3d5SGustavo Padovan skb->data_len += (*frag)->len; 22532d0ed3d5SGustavo Padovan 22540a708f8fSGustavo F. Padovan frag = &(*frag)->next; 22550a708f8fSGustavo F. Padovan } 22560a708f8fSGustavo F. Padovan 22570a708f8fSGustavo F. Padovan return sent; 22580a708f8fSGustavo F. Padovan } 22590a708f8fSGustavo F. Padovan 22605e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, 22615e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 22625e59b791SLuiz Augusto von Dentz u32 priority) 22630a708f8fSGustavo F. Padovan { 22648c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22650a708f8fSGustavo F. Padovan struct sk_buff *skb; 226603a51213SAndrei Emeltchenko int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; 22670a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 22680a708f8fSGustavo F. Padovan 2269b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu priority %u", chan, len, priority); 22700a708f8fSGustavo F. Padovan 22710a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 22722f7719ceSAndrei Emeltchenko 22732f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 227490338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 227590338947SGustavo Padovan if (IS_ERR(skb)) 227690338947SGustavo Padovan return skb; 22770a708f8fSGustavo F. Padovan 22785e59b791SLuiz Augusto von Dentz skb->priority = priority; 22795e59b791SLuiz Augusto von Dentz 22800a708f8fSGustavo F. Padovan /* Create L2CAP header */ 22810a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2282fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 2283daf6a78cSAndrei Emeltchenko lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); 2284daf6a78cSAndrei Emeltchenko put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); 22850a708f8fSGustavo F. Padovan 22860952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 22870a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 22880a708f8fSGustavo F. Padovan kfree_skb(skb); 22890a708f8fSGustavo F. Padovan return ERR_PTR(err); 22900a708f8fSGustavo F. Padovan } 22910a708f8fSGustavo F. Padovan return skb; 22920a708f8fSGustavo F. Padovan } 22930a708f8fSGustavo F. Padovan 22945e59b791SLuiz Augusto von Dentz static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, 22955e59b791SLuiz Augusto von Dentz struct msghdr *msg, size_t len, 22965e59b791SLuiz Augusto von Dentz u32 priority) 22970a708f8fSGustavo F. Padovan { 22988c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 22990a708f8fSGustavo F. Padovan struct sk_buff *skb; 2300f2ba7faeSGustavo Padovan int err, count; 23010a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 23020a708f8fSGustavo F. Padovan 2303b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 23040a708f8fSGustavo F. Padovan 2305f2ba7faeSGustavo Padovan count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); 23062f7719ceSAndrei Emeltchenko 2307f2ba7faeSGustavo Padovan skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, 230890338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 230990338947SGustavo Padovan if (IS_ERR(skb)) 231090338947SGustavo Padovan return skb; 23110a708f8fSGustavo F. Padovan 23125e59b791SLuiz Augusto von Dentz skb->priority = priority; 23135e59b791SLuiz Augusto von Dentz 23140a708f8fSGustavo F. Padovan /* Create L2CAP header */ 23150a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2316fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 23176ff9b5efSGustavo Padovan lh->len = cpu_to_le16(len); 23180a708f8fSGustavo F. Padovan 23190952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 23200a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 23210a708f8fSGustavo F. Padovan kfree_skb(skb); 23220a708f8fSGustavo F. Padovan return ERR_PTR(err); 23230a708f8fSGustavo F. Padovan } 23240a708f8fSGustavo F. Padovan return skb; 23250a708f8fSGustavo F. Padovan } 23260a708f8fSGustavo F. Padovan 2327ab0ff76dSLuiz Augusto von Dentz static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, 2328ab0ff76dSLuiz Augusto von Dentz struct msghdr *msg, size_t len, 232994122bbeSMat Martineau u16 sdulen) 23300a708f8fSGustavo F. Padovan { 23318c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 23320a708f8fSGustavo F. Padovan struct sk_buff *skb; 2333e4ca6d98SAndrei Emeltchenko int err, count, hlen; 23340a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 23350a708f8fSGustavo F. Padovan 2336b4400672SAndrei Emeltchenko BT_DBG("chan %p len %zu", chan, len); 23370a708f8fSGustavo F. Padovan 23380a708f8fSGustavo F. Padovan if (!conn) 23390a708f8fSGustavo F. Padovan return ERR_PTR(-ENOTCONN); 23400a708f8fSGustavo F. Padovan 2341ba7aa64fSGustavo Padovan hlen = __ertm_hdr_size(chan); 2342e4ca6d98SAndrei Emeltchenko 23430a708f8fSGustavo F. Padovan if (sdulen) 234403a51213SAndrei Emeltchenko hlen += L2CAP_SDULEN_SIZE; 23450a708f8fSGustavo F. Padovan 234647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 234703a51213SAndrei Emeltchenko hlen += L2CAP_FCS_SIZE; 23480a708f8fSGustavo F. Padovan 23490a708f8fSGustavo F. Padovan count = min_t(unsigned int, (conn->mtu - hlen), len); 23502f7719ceSAndrei Emeltchenko 23512f7719ceSAndrei Emeltchenko skb = chan->ops->alloc_skb(chan, count + hlen, 235290338947SGustavo Padovan msg->msg_flags & MSG_DONTWAIT); 235390338947SGustavo Padovan if (IS_ERR(skb)) 235490338947SGustavo Padovan return skb; 23550a708f8fSGustavo F. Padovan 23560a708f8fSGustavo F. Padovan /* Create L2CAP header */ 23570a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 2358fe4128e0SGustavo F. Padovan lh->cid = cpu_to_le16(chan->dcid); 23590a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); 236088843ab0SAndrei Emeltchenko 236118a48e76SMat Martineau /* Control header is populated later */ 236218a48e76SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 236318a48e76SMat Martineau put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); 236418a48e76SMat Martineau else 236518a48e76SMat Martineau put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); 236688843ab0SAndrei Emeltchenko 23670a708f8fSGustavo F. Padovan if (sdulen) 236803a51213SAndrei Emeltchenko put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); 23690a708f8fSGustavo F. Padovan 23700952a57aSAndrei Emeltchenko err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); 23710a708f8fSGustavo F. Padovan if (unlikely(err < 0)) { 23720a708f8fSGustavo F. Padovan kfree_skb(skb); 23730a708f8fSGustavo F. Padovan return ERR_PTR(err); 23740a708f8fSGustavo F. Padovan } 23750a708f8fSGustavo F. Padovan 237618a48e76SMat Martineau bt_cb(skb)->control.fcs = chan->fcs; 23773ce3514fSMat Martineau bt_cb(skb)->control.retries = 0; 23780a708f8fSGustavo F. Padovan return skb; 23790a708f8fSGustavo F. Padovan } 23800a708f8fSGustavo F. Padovan 238194122bbeSMat Martineau static int l2cap_segment_sdu(struct l2cap_chan *chan, 238294122bbeSMat Martineau struct sk_buff_head *seg_queue, 238394122bbeSMat Martineau struct msghdr *msg, size_t len) 23840a708f8fSGustavo F. Padovan { 23850a708f8fSGustavo F. Padovan struct sk_buff *skb; 238694122bbeSMat Martineau u16 sdu_len; 238794122bbeSMat Martineau size_t pdu_len; 238894122bbeSMat Martineau u8 sar; 23890a708f8fSGustavo F. Padovan 2390b4400672SAndrei Emeltchenko BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); 23910a708f8fSGustavo F. Padovan 239294122bbeSMat Martineau /* It is critical that ERTM PDUs fit in a single HCI fragment, 239394122bbeSMat Martineau * so fragmented skbs are not used. The HCI layer's handling 239494122bbeSMat Martineau * of fragmented skbs is not compatible with ERTM's queueing. 239594122bbeSMat Martineau */ 239694122bbeSMat Martineau 239794122bbeSMat Martineau /* PDU size is derived from the HCI MTU */ 239894122bbeSMat Martineau pdu_len = chan->conn->mtu; 239994122bbeSMat Martineau 2400a549574dSMat Martineau /* Constrain PDU size for BR/EDR connections */ 2401a549574dSMat Martineau if (!chan->hs_hcon) 240294122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); 240394122bbeSMat Martineau 240494122bbeSMat Martineau /* Adjust for largest possible L2CAP overhead. */ 240535d401dfSGustavo Padovan if (chan->fcs) 240635d401dfSGustavo Padovan pdu_len -= L2CAP_FCS_SIZE; 240735d401dfSGustavo Padovan 2408ba7aa64fSGustavo Padovan pdu_len -= __ertm_hdr_size(chan); 240994122bbeSMat Martineau 241094122bbeSMat Martineau /* Remote device may have requested smaller PDUs */ 241194122bbeSMat Martineau pdu_len = min_t(size_t, pdu_len, chan->remote_mps); 241294122bbeSMat Martineau 241394122bbeSMat Martineau if (len <= pdu_len) { 241494122bbeSMat Martineau sar = L2CAP_SAR_UNSEGMENTED; 241594122bbeSMat Martineau sdu_len = 0; 241694122bbeSMat Martineau pdu_len = len; 241794122bbeSMat Martineau } else { 241894122bbeSMat Martineau sar = L2CAP_SAR_START; 241994122bbeSMat Martineau sdu_len = len; 242094122bbeSMat Martineau pdu_len -= L2CAP_SDULEN_SIZE; 242194122bbeSMat Martineau } 24220a708f8fSGustavo F. Padovan 24230a708f8fSGustavo F. Padovan while (len > 0) { 242494122bbeSMat Martineau skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); 24250a708f8fSGustavo F. Padovan 24260a708f8fSGustavo F. Padovan if (IS_ERR(skb)) { 242794122bbeSMat Martineau __skb_queue_purge(seg_queue); 24280a708f8fSGustavo F. Padovan return PTR_ERR(skb); 24290a708f8fSGustavo F. Padovan } 24300a708f8fSGustavo F. Padovan 243194122bbeSMat Martineau bt_cb(skb)->control.sar = sar; 243294122bbeSMat Martineau __skb_queue_tail(seg_queue, skb); 24330a708f8fSGustavo F. Padovan 243494122bbeSMat Martineau len -= pdu_len; 243594122bbeSMat Martineau if (sdu_len) { 243694122bbeSMat Martineau sdu_len = 0; 243794122bbeSMat Martineau pdu_len += L2CAP_SDULEN_SIZE; 243894122bbeSMat Martineau } 243994122bbeSMat Martineau 244094122bbeSMat Martineau if (len <= pdu_len) { 244194122bbeSMat Martineau sar = L2CAP_SAR_END; 244294122bbeSMat Martineau pdu_len = len; 244394122bbeSMat Martineau } else { 244494122bbeSMat Martineau sar = L2CAP_SAR_CONTINUE; 244594122bbeSMat Martineau } 244694122bbeSMat Martineau } 244794122bbeSMat Martineau 2448f0f62799SGustavo Padovan return 0; 24490a708f8fSGustavo F. Padovan } 24500a708f8fSGustavo F. Padovan 24515e59b791SLuiz Augusto von Dentz int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, 24525e59b791SLuiz Augusto von Dentz u32 priority) 24539a91a04aSGustavo F. Padovan { 24549a91a04aSGustavo F. Padovan struct sk_buff *skb; 24559a91a04aSGustavo F. Padovan int err; 245694122bbeSMat Martineau struct sk_buff_head seg_queue; 24579a91a04aSGustavo F. Padovan 24589a91a04aSGustavo F. Padovan /* Connectionless channel */ 2459715ec005SGustavo F. Padovan if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { 24605e59b791SLuiz Augusto von Dentz skb = l2cap_create_connless_pdu(chan, msg, len, priority); 24619a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 24629a91a04aSGustavo F. Padovan return PTR_ERR(skb); 24639a91a04aSGustavo F. Padovan 24649a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 24659a91a04aSGustavo F. Padovan return len; 24669a91a04aSGustavo F. Padovan } 24679a91a04aSGustavo F. Padovan 24689a91a04aSGustavo F. Padovan switch (chan->mode) { 24699a91a04aSGustavo F. Padovan case L2CAP_MODE_BASIC: 24709a91a04aSGustavo F. Padovan /* Check outgoing MTU */ 24719a91a04aSGustavo F. Padovan if (len > chan->omtu) 24729a91a04aSGustavo F. Padovan return -EMSGSIZE; 24739a91a04aSGustavo F. Padovan 24749a91a04aSGustavo F. Padovan /* Create a basic PDU */ 24755e59b791SLuiz Augusto von Dentz skb = l2cap_create_basic_pdu(chan, msg, len, priority); 24769a91a04aSGustavo F. Padovan if (IS_ERR(skb)) 24779a91a04aSGustavo F. Padovan return PTR_ERR(skb); 24789a91a04aSGustavo F. Padovan 24799a91a04aSGustavo F. Padovan l2cap_do_send(chan, skb); 24809a91a04aSGustavo F. Padovan err = len; 24819a91a04aSGustavo F. Padovan break; 24829a91a04aSGustavo F. Padovan 24839a91a04aSGustavo F. Padovan case L2CAP_MODE_ERTM: 24849a91a04aSGustavo F. Padovan case L2CAP_MODE_STREAMING: 248594122bbeSMat Martineau /* Check outgoing MTU */ 248694122bbeSMat Martineau if (len > chan->omtu) { 248794122bbeSMat Martineau err = -EMSGSIZE; 24889a91a04aSGustavo F. Padovan break; 24899a91a04aSGustavo F. Padovan } 24909a91a04aSGustavo F. Padovan 249194122bbeSMat Martineau __skb_queue_head_init(&seg_queue); 249294122bbeSMat Martineau 249394122bbeSMat Martineau /* Do segmentation before calling in to the state machine, 249494122bbeSMat Martineau * since it's possible to block while waiting for memory 249594122bbeSMat Martineau * allocation. 249694122bbeSMat Martineau */ 249794122bbeSMat Martineau err = l2cap_segment_sdu(chan, &seg_queue, msg, len); 249894122bbeSMat Martineau 249994122bbeSMat Martineau /* The channel could have been closed while segmenting, 250094122bbeSMat Martineau * check that it is still connected. 250194122bbeSMat Martineau */ 250294122bbeSMat Martineau if (chan->state != BT_CONNECTED) { 250394122bbeSMat Martineau __skb_queue_purge(&seg_queue); 250494122bbeSMat Martineau err = -ENOTCONN; 25059a91a04aSGustavo F. Padovan } 25069a91a04aSGustavo F. Padovan 250794122bbeSMat Martineau if (err) 250894122bbeSMat Martineau break; 250994122bbeSMat Martineau 25103733937dSMat Martineau if (chan->mode == L2CAP_MODE_ERTM) 2511d660366dSGustavo Padovan l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); 25123733937dSMat Martineau else 2513d660366dSGustavo Padovan l2cap_streaming_send(chan, &seg_queue); 251494122bbeSMat Martineau 25159a91a04aSGustavo F. Padovan err = len; 25169a91a04aSGustavo F. Padovan 251794122bbeSMat Martineau /* If the skbs were not queued for sending, they'll still be in 251894122bbeSMat Martineau * seg_queue and need to be purged. 251994122bbeSMat Martineau */ 252094122bbeSMat Martineau __skb_queue_purge(&seg_queue); 25219a91a04aSGustavo F. Padovan break; 25229a91a04aSGustavo F. Padovan 25239a91a04aSGustavo F. Padovan default: 25249a91a04aSGustavo F. Padovan BT_DBG("bad state %1.1x", chan->mode); 25259a91a04aSGustavo F. Padovan err = -EBADFD; 25269a91a04aSGustavo F. Padovan } 25279a91a04aSGustavo F. Padovan 25289a91a04aSGustavo F. Padovan return err; 25299a91a04aSGustavo F. Padovan } 25309a91a04aSGustavo F. Padovan 2531d2a7ac5dSMat Martineau static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) 2532d2a7ac5dSMat Martineau { 2533bed68bdeSMat Martineau struct l2cap_ctrl control; 2534bed68bdeSMat Martineau u16 seq; 2535bed68bdeSMat Martineau 2536b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2537bed68bdeSMat Martineau 2538bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2539bed68bdeSMat Martineau control.sframe = 1; 2540bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2541bed68bdeSMat Martineau 2542bed68bdeSMat Martineau for (seq = chan->expected_tx_seq; seq != txseq; 2543bed68bdeSMat Martineau seq = __next_seq(chan, seq)) { 2544bed68bdeSMat Martineau if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { 2545bed68bdeSMat Martineau control.reqseq = seq; 2546bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2547bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2548bed68bdeSMat Martineau } 2549bed68bdeSMat Martineau } 2550bed68bdeSMat Martineau 2551bed68bdeSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 2552d2a7ac5dSMat Martineau } 2553d2a7ac5dSMat Martineau 2554d2a7ac5dSMat Martineau static void l2cap_send_srej_tail(struct l2cap_chan *chan) 2555d2a7ac5dSMat Martineau { 2556bed68bdeSMat Martineau struct l2cap_ctrl control; 2557bed68bdeSMat Martineau 2558bed68bdeSMat Martineau BT_DBG("chan %p", chan); 2559bed68bdeSMat Martineau 2560bed68bdeSMat Martineau if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) 2561bed68bdeSMat Martineau return; 2562bed68bdeSMat Martineau 2563bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2564bed68bdeSMat Martineau control.sframe = 1; 2565bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2566bed68bdeSMat Martineau control.reqseq = chan->srej_list.tail; 2567bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2568d2a7ac5dSMat Martineau } 2569d2a7ac5dSMat Martineau 2570d2a7ac5dSMat Martineau static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) 2571d2a7ac5dSMat Martineau { 2572bed68bdeSMat Martineau struct l2cap_ctrl control; 2573bed68bdeSMat Martineau u16 initial_head; 2574bed68bdeSMat Martineau u16 seq; 2575bed68bdeSMat Martineau 2576b4400672SAndrei Emeltchenko BT_DBG("chan %p, txseq %u", chan, txseq); 2577bed68bdeSMat Martineau 2578bed68bdeSMat Martineau memset(&control, 0, sizeof(control)); 2579bed68bdeSMat Martineau control.sframe = 1; 2580bed68bdeSMat Martineau control.super = L2CAP_SUPER_SREJ; 2581bed68bdeSMat Martineau 2582bed68bdeSMat Martineau /* Capture initial list head to allow only one pass through the list. */ 2583bed68bdeSMat Martineau initial_head = chan->srej_list.head; 2584bed68bdeSMat Martineau 2585bed68bdeSMat Martineau do { 2586bed68bdeSMat Martineau seq = l2cap_seq_list_pop(&chan->srej_list); 2587bed68bdeSMat Martineau if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) 2588bed68bdeSMat Martineau break; 2589bed68bdeSMat Martineau 2590bed68bdeSMat Martineau control.reqseq = seq; 2591bed68bdeSMat Martineau l2cap_send_sframe(chan, &control); 2592bed68bdeSMat Martineau l2cap_seq_list_append(&chan->srej_list, seq); 2593bed68bdeSMat Martineau } while (chan->srej_list.head != initial_head); 2594d2a7ac5dSMat Martineau } 2595d2a7ac5dSMat Martineau 2596608bcc6dSMat Martineau static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) 2597608bcc6dSMat Martineau { 2598608bcc6dSMat Martineau struct sk_buff *acked_skb; 2599608bcc6dSMat Martineau u16 ackseq; 2600608bcc6dSMat Martineau 2601b4400672SAndrei Emeltchenko BT_DBG("chan %p, reqseq %u", chan, reqseq); 2602608bcc6dSMat Martineau 2603608bcc6dSMat Martineau if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) 2604608bcc6dSMat Martineau return; 2605608bcc6dSMat Martineau 2606b4400672SAndrei Emeltchenko BT_DBG("expected_ack_seq %u, unacked_frames %u", 2607608bcc6dSMat Martineau chan->expected_ack_seq, chan->unacked_frames); 2608608bcc6dSMat Martineau 2609608bcc6dSMat Martineau for (ackseq = chan->expected_ack_seq; ackseq != reqseq; 2610608bcc6dSMat Martineau ackseq = __next_seq(chan, ackseq)) { 2611608bcc6dSMat Martineau 2612608bcc6dSMat Martineau acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); 2613608bcc6dSMat Martineau if (acked_skb) { 2614608bcc6dSMat Martineau skb_unlink(acked_skb, &chan->tx_q); 2615608bcc6dSMat Martineau kfree_skb(acked_skb); 2616608bcc6dSMat Martineau chan->unacked_frames--; 2617608bcc6dSMat Martineau } 2618608bcc6dSMat Martineau } 2619608bcc6dSMat Martineau 2620608bcc6dSMat Martineau chan->expected_ack_seq = reqseq; 2621608bcc6dSMat Martineau 2622608bcc6dSMat Martineau if (chan->unacked_frames == 0) 2623608bcc6dSMat Martineau __clear_retrans_timer(chan); 2624608bcc6dSMat Martineau 2625b4400672SAndrei Emeltchenko BT_DBG("unacked_frames %u", chan->unacked_frames); 2626608bcc6dSMat Martineau } 2627608bcc6dSMat Martineau 2628608bcc6dSMat Martineau static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) 2629608bcc6dSMat Martineau { 2630608bcc6dSMat Martineau BT_DBG("chan %p", chan); 2631608bcc6dSMat Martineau 2632608bcc6dSMat Martineau chan->expected_tx_seq = chan->buffer_seq; 2633608bcc6dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 2634608bcc6dSMat Martineau skb_queue_purge(&chan->srej_q); 2635608bcc6dSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 2636608bcc6dSMat Martineau } 2637608bcc6dSMat Martineau 2638d660366dSGustavo Padovan static void l2cap_tx_state_xmit(struct l2cap_chan *chan, 2639608bcc6dSMat Martineau struct l2cap_ctrl *control, 2640608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2641608bcc6dSMat Martineau { 2642608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2643608bcc6dSMat Martineau event); 2644608bcc6dSMat Martineau 2645608bcc6dSMat Martineau switch (event) { 2646608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2647608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2648608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2649608bcc6dSMat Martineau 2650608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2651608bcc6dSMat Martineau l2cap_ertm_send(chan); 2652608bcc6dSMat Martineau break; 2653608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2654608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2655608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2656608bcc6dSMat Martineau 2657608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2658608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2659608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2660608bcc6dSMat Martineau */ 2661608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2662608bcc6dSMat Martineau } 2663608bcc6dSMat Martineau 2664608bcc6dSMat Martineau l2cap_send_ack(chan); 2665608bcc6dSMat Martineau 2666608bcc6dSMat Martineau break; 2667608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2668608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2669608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2670608bcc6dSMat Martineau 2671608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2672608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2673608bcc6dSMat Martineau 2674608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2675608bcc6dSMat Martineau local_control.sframe = 1; 2676608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2677608bcc6dSMat Martineau local_control.poll = 1; 2678608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2679a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2680608bcc6dSMat Martineau 2681608bcc6dSMat Martineau chan->retry_count = 1; 2682608bcc6dSMat Martineau __set_monitor_timer(chan); 2683608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2684608bcc6dSMat Martineau } 2685608bcc6dSMat Martineau break; 2686608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2687608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2688608bcc6dSMat Martineau break; 2689608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2690608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2691608bcc6dSMat Martineau chan->retry_count = 1; 2692608bcc6dSMat Martineau __set_monitor_timer(chan); 2693608bcc6dSMat Martineau __clear_ack_timer(chan); 2694608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2695608bcc6dSMat Martineau break; 2696608bcc6dSMat Martineau case L2CAP_EV_RETRANS_TO: 2697608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2698608bcc6dSMat Martineau chan->retry_count = 1; 2699608bcc6dSMat Martineau __set_monitor_timer(chan); 2700608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2701608bcc6dSMat Martineau break; 2702608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2703608bcc6dSMat Martineau /* Nothing to process */ 2704608bcc6dSMat Martineau break; 2705608bcc6dSMat Martineau default: 2706608bcc6dSMat Martineau break; 2707608bcc6dSMat Martineau } 2708608bcc6dSMat Martineau } 2709608bcc6dSMat Martineau 2710d660366dSGustavo Padovan static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, 2711608bcc6dSMat Martineau struct l2cap_ctrl *control, 2712608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2713608bcc6dSMat Martineau { 2714608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, 2715608bcc6dSMat Martineau event); 2716608bcc6dSMat Martineau 2717608bcc6dSMat Martineau switch (event) { 2718608bcc6dSMat Martineau case L2CAP_EV_DATA_REQUEST: 2719608bcc6dSMat Martineau if (chan->tx_send_head == NULL) 2720608bcc6dSMat Martineau chan->tx_send_head = skb_peek(skbs); 2721608bcc6dSMat Martineau /* Queue data, but don't send. */ 2722608bcc6dSMat Martineau skb_queue_splice_tail_init(skbs, &chan->tx_q); 2723608bcc6dSMat Martineau break; 2724608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_DETECTED: 2725608bcc6dSMat Martineau BT_DBG("Enter LOCAL_BUSY"); 2726608bcc6dSMat Martineau set_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2727608bcc6dSMat Martineau 2728608bcc6dSMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 2729608bcc6dSMat Martineau /* The SREJ_SENT state must be aborted if we are to 2730608bcc6dSMat Martineau * enter the LOCAL_BUSY state. 2731608bcc6dSMat Martineau */ 2732608bcc6dSMat Martineau l2cap_abort_rx_srej_sent(chan); 2733608bcc6dSMat Martineau } 2734608bcc6dSMat Martineau 2735608bcc6dSMat Martineau l2cap_send_ack(chan); 2736608bcc6dSMat Martineau 2737608bcc6dSMat Martineau break; 2738608bcc6dSMat Martineau case L2CAP_EV_LOCAL_BUSY_CLEAR: 2739608bcc6dSMat Martineau BT_DBG("Exit LOCAL_BUSY"); 2740608bcc6dSMat Martineau clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); 2741608bcc6dSMat Martineau 2742608bcc6dSMat Martineau if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { 2743608bcc6dSMat Martineau struct l2cap_ctrl local_control; 2744608bcc6dSMat Martineau memset(&local_control, 0, sizeof(local_control)); 2745608bcc6dSMat Martineau local_control.sframe = 1; 2746608bcc6dSMat Martineau local_control.super = L2CAP_SUPER_RR; 2747608bcc6dSMat Martineau local_control.poll = 1; 2748608bcc6dSMat Martineau local_control.reqseq = chan->buffer_seq; 2749a67d7f6fSMat Martineau l2cap_send_sframe(chan, &local_control); 2750608bcc6dSMat Martineau 2751608bcc6dSMat Martineau chan->retry_count = 1; 2752608bcc6dSMat Martineau __set_monitor_timer(chan); 2753608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_WAIT_F; 2754608bcc6dSMat Martineau } 2755608bcc6dSMat Martineau break; 2756608bcc6dSMat Martineau case L2CAP_EV_RECV_REQSEQ_AND_FBIT: 2757608bcc6dSMat Martineau l2cap_process_reqseq(chan, control->reqseq); 2758608bcc6dSMat Martineau 2759608bcc6dSMat Martineau /* Fall through */ 2760608bcc6dSMat Martineau 2761608bcc6dSMat Martineau case L2CAP_EV_RECV_FBIT: 2762608bcc6dSMat Martineau if (control && control->final) { 2763608bcc6dSMat Martineau __clear_monitor_timer(chan); 2764608bcc6dSMat Martineau if (chan->unacked_frames > 0) 2765608bcc6dSMat Martineau __set_retrans_timer(chan); 2766608bcc6dSMat Martineau chan->retry_count = 0; 2767608bcc6dSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 2768608bcc6dSMat Martineau BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); 2769608bcc6dSMat Martineau } 2770608bcc6dSMat Martineau break; 2771608bcc6dSMat Martineau case L2CAP_EV_EXPLICIT_POLL: 2772608bcc6dSMat Martineau /* Ignore */ 2773608bcc6dSMat Martineau break; 2774608bcc6dSMat Martineau case L2CAP_EV_MONITOR_TO: 2775608bcc6dSMat Martineau if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { 2776608bcc6dSMat Martineau l2cap_send_rr_or_rnr(chan, 1); 2777608bcc6dSMat Martineau __set_monitor_timer(chan); 2778608bcc6dSMat Martineau chan->retry_count++; 2779608bcc6dSMat Martineau } else { 27805e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNABORTED); 2781608bcc6dSMat Martineau } 2782608bcc6dSMat Martineau break; 2783608bcc6dSMat Martineau default: 2784608bcc6dSMat Martineau break; 2785608bcc6dSMat Martineau } 2786608bcc6dSMat Martineau } 2787608bcc6dSMat Martineau 2788d660366dSGustavo Padovan static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 2789608bcc6dSMat Martineau struct sk_buff_head *skbs, u8 event) 2790608bcc6dSMat Martineau { 2791608bcc6dSMat Martineau BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", 2792608bcc6dSMat Martineau chan, control, skbs, event, chan->tx_state); 2793608bcc6dSMat Martineau 2794608bcc6dSMat Martineau switch (chan->tx_state) { 2795608bcc6dSMat Martineau case L2CAP_TX_STATE_XMIT: 2796d660366dSGustavo Padovan l2cap_tx_state_xmit(chan, control, skbs, event); 2797608bcc6dSMat Martineau break; 2798608bcc6dSMat Martineau case L2CAP_TX_STATE_WAIT_F: 2799d660366dSGustavo Padovan l2cap_tx_state_wait_f(chan, control, skbs, event); 2800608bcc6dSMat Martineau break; 2801608bcc6dSMat Martineau default: 2802608bcc6dSMat Martineau /* Ignore event */ 2803608bcc6dSMat Martineau break; 2804608bcc6dSMat Martineau } 2805608bcc6dSMat Martineau } 2806608bcc6dSMat Martineau 28074b51dae9SMat Martineau static void l2cap_pass_to_tx(struct l2cap_chan *chan, 28084b51dae9SMat Martineau struct l2cap_ctrl *control) 28094b51dae9SMat Martineau { 28104b51dae9SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2811401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); 28124b51dae9SMat Martineau } 28134b51dae9SMat Martineau 2814f80842a8SMat Martineau static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, 2815f80842a8SMat Martineau struct l2cap_ctrl *control) 2816f80842a8SMat Martineau { 2817f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 2818401bb1f7SAndrei Emeltchenko l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); 2819f80842a8SMat Martineau } 2820f80842a8SMat Martineau 28210a708f8fSGustavo F. Padovan /* Copy frame to all raw sockets on that connection */ 28220a708f8fSGustavo F. Padovan static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) 28230a708f8fSGustavo F. Padovan { 28240a708f8fSGustavo F. Padovan struct sk_buff *nskb; 282548454079SGustavo F. Padovan struct l2cap_chan *chan; 28260a708f8fSGustavo F. Padovan 28270a708f8fSGustavo F. Padovan BT_DBG("conn %p", conn); 28280a708f8fSGustavo F. Padovan 28293df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 28303d57dc68SGustavo F. Padovan 28313df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 283248454079SGustavo F. Padovan struct sock *sk = chan->sk; 2833715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_RAW) 28340a708f8fSGustavo F. Padovan continue; 28350a708f8fSGustavo F. Padovan 28360a708f8fSGustavo F. Padovan /* Don't send frame to the socket it came from */ 28370a708f8fSGustavo F. Padovan if (skb->sk == sk) 28380a708f8fSGustavo F. Padovan continue; 28398bcde1f2SGustavo Padovan nskb = skb_clone(skb, GFP_KERNEL); 28400a708f8fSGustavo F. Padovan if (!nskb) 28410a708f8fSGustavo F. Padovan continue; 28420a708f8fSGustavo F. Padovan 284380b98027SGustavo Padovan if (chan->ops->recv(chan, nskb)) 28440a708f8fSGustavo F. Padovan kfree_skb(nskb); 28450a708f8fSGustavo F. Padovan } 28463d57dc68SGustavo F. Padovan 28473df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 28480a708f8fSGustavo F. Padovan } 28490a708f8fSGustavo F. Padovan 28500a708f8fSGustavo F. Padovan /* ---- L2CAP signalling commands ---- */ 2851b4400672SAndrei Emeltchenko static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, 2852b4400672SAndrei Emeltchenko u8 ident, u16 dlen, void *data) 28530a708f8fSGustavo F. Padovan { 28540a708f8fSGustavo F. Padovan struct sk_buff *skb, **frag; 28550a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr *cmd; 28560a708f8fSGustavo F. Padovan struct l2cap_hdr *lh; 28570a708f8fSGustavo F. Padovan int len, count; 28580a708f8fSGustavo F. Padovan 2859b4400672SAndrei Emeltchenko BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", 28600a708f8fSGustavo F. Padovan conn, code, ident, dlen); 28610a708f8fSGustavo F. Padovan 2862300b962eSAnderson Lizardo if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) 2863300b962eSAnderson Lizardo return NULL; 2864300b962eSAnderson Lizardo 28650a708f8fSGustavo F. Padovan len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; 28660a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 28670a708f8fSGustavo F. Padovan 28688bcde1f2SGustavo Padovan skb = bt_skb_alloc(count, GFP_KERNEL); 28690a708f8fSGustavo F. Padovan if (!skb) 28700a708f8fSGustavo F. Padovan return NULL; 28710a708f8fSGustavo F. Padovan 28720a708f8fSGustavo F. Padovan lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); 28730a708f8fSGustavo F. Padovan lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); 28743300d9a9SClaudio Takahasi 28753300d9a9SClaudio Takahasi if (conn->hcon->type == LE_LINK) 2876ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); 28773300d9a9SClaudio Takahasi else 2878ac73498cSAndrei Emeltchenko lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); 28790a708f8fSGustavo F. Padovan 28800a708f8fSGustavo F. Padovan cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); 28810a708f8fSGustavo F. Padovan cmd->code = code; 28820a708f8fSGustavo F. Padovan cmd->ident = ident; 28830a708f8fSGustavo F. Padovan cmd->len = cpu_to_le16(dlen); 28840a708f8fSGustavo F. Padovan 28850a708f8fSGustavo F. Padovan if (dlen) { 28860a708f8fSGustavo F. Padovan count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; 28870a708f8fSGustavo F. Padovan memcpy(skb_put(skb, count), data, count); 28880a708f8fSGustavo F. Padovan data += count; 28890a708f8fSGustavo F. Padovan } 28900a708f8fSGustavo F. Padovan 28910a708f8fSGustavo F. Padovan len -= skb->len; 28920a708f8fSGustavo F. Padovan 28930a708f8fSGustavo F. Padovan /* Continuation fragments (no L2CAP header) */ 28940a708f8fSGustavo F. Padovan frag = &skb_shinfo(skb)->frag_list; 28950a708f8fSGustavo F. Padovan while (len) { 28960a708f8fSGustavo F. Padovan count = min_t(unsigned int, conn->mtu, len); 28970a708f8fSGustavo F. Padovan 28988bcde1f2SGustavo Padovan *frag = bt_skb_alloc(count, GFP_KERNEL); 28990a708f8fSGustavo F. Padovan if (!*frag) 29000a708f8fSGustavo F. Padovan goto fail; 29010a708f8fSGustavo F. Padovan 29020a708f8fSGustavo F. Padovan memcpy(skb_put(*frag, count), data, count); 29030a708f8fSGustavo F. Padovan 29040a708f8fSGustavo F. Padovan len -= count; 29050a708f8fSGustavo F. Padovan data += count; 29060a708f8fSGustavo F. Padovan 29070a708f8fSGustavo F. Padovan frag = &(*frag)->next; 29080a708f8fSGustavo F. Padovan } 29090a708f8fSGustavo F. Padovan 29100a708f8fSGustavo F. Padovan return skb; 29110a708f8fSGustavo F. Padovan 29120a708f8fSGustavo F. Padovan fail: 29130a708f8fSGustavo F. Padovan kfree_skb(skb); 29140a708f8fSGustavo F. Padovan return NULL; 29150a708f8fSGustavo F. Padovan } 29160a708f8fSGustavo F. Padovan 29172d792818SGustavo Padovan static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, 29182d792818SGustavo Padovan unsigned long *val) 29190a708f8fSGustavo F. Padovan { 29200a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 29210a708f8fSGustavo F. Padovan int len; 29220a708f8fSGustavo F. Padovan 29230a708f8fSGustavo F. Padovan len = L2CAP_CONF_OPT_SIZE + opt->len; 29240a708f8fSGustavo F. Padovan *ptr += len; 29250a708f8fSGustavo F. Padovan 29260a708f8fSGustavo F. Padovan *type = opt->type; 29270a708f8fSGustavo F. Padovan *olen = opt->len; 29280a708f8fSGustavo F. Padovan 29290a708f8fSGustavo F. Padovan switch (opt->len) { 29300a708f8fSGustavo F. Padovan case 1: 29310a708f8fSGustavo F. Padovan *val = *((u8 *) opt->val); 29320a708f8fSGustavo F. Padovan break; 29330a708f8fSGustavo F. Padovan 29340a708f8fSGustavo F. Padovan case 2: 29350a708f8fSGustavo F. Padovan *val = get_unaligned_le16(opt->val); 29360a708f8fSGustavo F. Padovan break; 29370a708f8fSGustavo F. Padovan 29380a708f8fSGustavo F. Padovan case 4: 29390a708f8fSGustavo F. Padovan *val = get_unaligned_le32(opt->val); 29400a708f8fSGustavo F. Padovan break; 29410a708f8fSGustavo F. Padovan 29420a708f8fSGustavo F. Padovan default: 29430a708f8fSGustavo F. Padovan *val = (unsigned long) opt->val; 29440a708f8fSGustavo F. Padovan break; 29450a708f8fSGustavo F. Padovan } 29460a708f8fSGustavo F. Padovan 2947b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); 29480a708f8fSGustavo F. Padovan return len; 29490a708f8fSGustavo F. Padovan } 29500a708f8fSGustavo F. Padovan 29510a708f8fSGustavo F. Padovan static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) 29520a708f8fSGustavo F. Padovan { 29530a708f8fSGustavo F. Padovan struct l2cap_conf_opt *opt = *ptr; 29540a708f8fSGustavo F. Padovan 2955b4400672SAndrei Emeltchenko BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); 29560a708f8fSGustavo F. Padovan 29570a708f8fSGustavo F. Padovan opt->type = type; 29580a708f8fSGustavo F. Padovan opt->len = len; 29590a708f8fSGustavo F. Padovan 29600a708f8fSGustavo F. Padovan switch (len) { 29610a708f8fSGustavo F. Padovan case 1: 29620a708f8fSGustavo F. Padovan *((u8 *) opt->val) = val; 29630a708f8fSGustavo F. Padovan break; 29640a708f8fSGustavo F. Padovan 29650a708f8fSGustavo F. Padovan case 2: 29660a708f8fSGustavo F. Padovan put_unaligned_le16(val, opt->val); 29670a708f8fSGustavo F. Padovan break; 29680a708f8fSGustavo F. Padovan 29690a708f8fSGustavo F. Padovan case 4: 29700a708f8fSGustavo F. Padovan put_unaligned_le32(val, opt->val); 29710a708f8fSGustavo F. Padovan break; 29720a708f8fSGustavo F. Padovan 29730a708f8fSGustavo F. Padovan default: 29740a708f8fSGustavo F. Padovan memcpy(opt->val, (void *) val, len); 29750a708f8fSGustavo F. Padovan break; 29760a708f8fSGustavo F. Padovan } 29770a708f8fSGustavo F. Padovan 29780a708f8fSGustavo F. Padovan *ptr += L2CAP_CONF_OPT_SIZE + len; 29790a708f8fSGustavo F. Padovan } 29800a708f8fSGustavo F. Padovan 2981f89cef09SAndrei Emeltchenko static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) 2982f89cef09SAndrei Emeltchenko { 2983f89cef09SAndrei Emeltchenko struct l2cap_conf_efs efs; 2984f89cef09SAndrei Emeltchenko 2985f89cef09SAndrei Emeltchenko switch (chan->mode) { 2986f89cef09SAndrei Emeltchenko case L2CAP_MODE_ERTM: 2987f89cef09SAndrei Emeltchenko efs.id = chan->local_id; 2988f89cef09SAndrei Emeltchenko efs.stype = chan->local_stype; 2989f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2990f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 2991ac73498cSAndrei Emeltchenko efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); 29928936fa6dSAndrei Emeltchenko efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); 2993f89cef09SAndrei Emeltchenko break; 2994f89cef09SAndrei Emeltchenko 2995f89cef09SAndrei Emeltchenko case L2CAP_MODE_STREAMING: 2996f89cef09SAndrei Emeltchenko efs.id = 1; 2997f89cef09SAndrei Emeltchenko efs.stype = L2CAP_SERV_BESTEFFORT; 2998f89cef09SAndrei Emeltchenko efs.msdu = cpu_to_le16(chan->local_msdu); 2999f89cef09SAndrei Emeltchenko efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); 3000f89cef09SAndrei Emeltchenko efs.acc_lat = 0; 3001f89cef09SAndrei Emeltchenko efs.flush_to = 0; 3002f89cef09SAndrei Emeltchenko break; 3003f89cef09SAndrei Emeltchenko 3004f89cef09SAndrei Emeltchenko default: 3005f89cef09SAndrei Emeltchenko return; 3006f89cef09SAndrei Emeltchenko } 3007f89cef09SAndrei Emeltchenko 3008f89cef09SAndrei Emeltchenko l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), 3009f89cef09SAndrei Emeltchenko (unsigned long) &efs); 3010f89cef09SAndrei Emeltchenko } 3011f89cef09SAndrei Emeltchenko 3012721c4181SGustavo F. Padovan static void l2cap_ack_timeout(struct work_struct *work) 30130a708f8fSGustavo F. Padovan { 3014721c4181SGustavo F. Padovan struct l2cap_chan *chan = container_of(work, struct l2cap_chan, 3015721c4181SGustavo F. Padovan ack_timer.work); 30160362520bSMat Martineau u16 frames_to_ack; 30170a708f8fSGustavo F. Padovan 30182fb9b3d4SGustavo F. Padovan BT_DBG("chan %p", chan); 30192fb9b3d4SGustavo F. Padovan 30206be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 30216be36555SAndrei Emeltchenko 30220362520bSMat Martineau frames_to_ack = __seq_offset(chan, chan->buffer_seq, 30230362520bSMat Martineau chan->last_acked_seq); 30240362520bSMat Martineau 30250362520bSMat Martineau if (frames_to_ack) 30260362520bSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 30276be36555SAndrei Emeltchenko 30286be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 302909bfb2eeSSzymon Janc l2cap_chan_put(chan); 30300a708f8fSGustavo F. Padovan } 30310a708f8fSGustavo F. Padovan 3032466f8004SAndrei Emeltchenko int l2cap_ertm_init(struct l2cap_chan *chan) 30330a708f8fSGustavo F. Padovan { 30343c588192SMat Martineau int err; 30353c588192SMat Martineau 3036105bdf9eSMat Martineau chan->next_tx_seq = 0; 3037105bdf9eSMat Martineau chan->expected_tx_seq = 0; 303842e5c802SGustavo F. Padovan chan->expected_ack_seq = 0; 30396a026610SGustavo F. Padovan chan->unacked_frames = 0; 304042e5c802SGustavo F. Padovan chan->buffer_seq = 0; 30416a026610SGustavo F. Padovan chan->frames_sent = 0; 3042105bdf9eSMat Martineau chan->last_acked_seq = 0; 3043105bdf9eSMat Martineau chan->sdu = NULL; 3044105bdf9eSMat Martineau chan->sdu_last_frag = NULL; 3045105bdf9eSMat Martineau chan->sdu_len = 0; 3046105bdf9eSMat Martineau 3047d34c34fbSMat Martineau skb_queue_head_init(&chan->tx_q); 3048d34c34fbSMat Martineau 304908333283SMat Martineau chan->local_amp_id = 0; 305008333283SMat Martineau chan->move_id = 0; 305108333283SMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 305208333283SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 305308333283SMat Martineau 3054105bdf9eSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 3055105bdf9eSMat Martineau return 0; 3056105bdf9eSMat Martineau 3057105bdf9eSMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 3058105bdf9eSMat Martineau chan->tx_state = L2CAP_TX_STATE_XMIT; 30590a708f8fSGustavo F. Padovan 3060721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); 3061721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); 3062721c4181SGustavo F. Padovan INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); 30630a708f8fSGustavo F. Padovan 3064f1c6775bSGustavo F. Padovan skb_queue_head_init(&chan->srej_q); 30650a708f8fSGustavo F. Padovan 30663c588192SMat Martineau err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); 30673c588192SMat Martineau if (err < 0) 30683c588192SMat Martineau return err; 30693c588192SMat Martineau 30709dc9affcSMat Martineau err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); 30719dc9affcSMat Martineau if (err < 0) 30729dc9affcSMat Martineau l2cap_seq_list_free(&chan->srej_list); 30739dc9affcSMat Martineau 30749dc9affcSMat Martineau return err; 30750a708f8fSGustavo F. Padovan } 30760a708f8fSGustavo F. Padovan 30770a708f8fSGustavo F. Padovan static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) 30780a708f8fSGustavo F. Padovan { 30790a708f8fSGustavo F. Padovan switch (mode) { 30800a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 30810a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 30820a708f8fSGustavo F. Padovan if (l2cap_mode_supported(mode, remote_feat_mask)) 30830a708f8fSGustavo F. Padovan return mode; 30840a708f8fSGustavo F. Padovan /* fall through */ 30850a708f8fSGustavo F. Padovan default: 30860a708f8fSGustavo F. Padovan return L2CAP_MODE_BASIC; 30870a708f8fSGustavo F. Padovan } 30880a708f8fSGustavo F. Padovan } 30890a708f8fSGustavo F. Padovan 3090848566b3SMarcel Holtmann static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) 30916327eb98SAndrei Emeltchenko { 3092848566b3SMarcel Holtmann return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; 30936327eb98SAndrei Emeltchenko } 30946327eb98SAndrei Emeltchenko 3095848566b3SMarcel Holtmann static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) 3096f89cef09SAndrei Emeltchenko { 3097848566b3SMarcel Holtmann return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; 3098f89cef09SAndrei Emeltchenko } 3099f89cef09SAndrei Emeltchenko 310036c86c85SMat Martineau static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, 310136c86c85SMat Martineau struct l2cap_conf_rfc *rfc) 310236c86c85SMat Martineau { 310336c86c85SMat Martineau if (chan->local_amp_id && chan->hs_hcon) { 310436c86c85SMat Martineau u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; 310536c86c85SMat Martineau 310636c86c85SMat Martineau /* Class 1 devices have must have ERTM timeouts 310736c86c85SMat Martineau * exceeding the Link Supervision Timeout. The 310836c86c85SMat Martineau * default Link Supervision Timeout for AMP 310936c86c85SMat Martineau * controllers is 10 seconds. 311036c86c85SMat Martineau * 311136c86c85SMat Martineau * Class 1 devices use 0xffffffff for their 311236c86c85SMat Martineau * best-effort flush timeout, so the clamping logic 311336c86c85SMat Martineau * will result in a timeout that meets the above 311436c86c85SMat Martineau * requirement. ERTM timeouts are 16-bit values, so 311536c86c85SMat Martineau * the maximum timeout is 65.535 seconds. 311636c86c85SMat Martineau */ 311736c86c85SMat Martineau 311836c86c85SMat Martineau /* Convert timeout to milliseconds and round */ 311936c86c85SMat Martineau ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); 312036c86c85SMat Martineau 312136c86c85SMat Martineau /* This is the recommended formula for class 2 devices 312236c86c85SMat Martineau * that start ERTM timers when packets are sent to the 312336c86c85SMat Martineau * controller. 312436c86c85SMat Martineau */ 312536c86c85SMat Martineau ertm_to = 3 * ertm_to + 500; 312636c86c85SMat Martineau 312736c86c85SMat Martineau if (ertm_to > 0xffff) 312836c86c85SMat Martineau ertm_to = 0xffff; 312936c86c85SMat Martineau 313036c86c85SMat Martineau rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); 313136c86c85SMat Martineau rfc->monitor_timeout = rfc->retrans_timeout; 313236c86c85SMat Martineau } else { 313336c86c85SMat Martineau rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); 313436c86c85SMat Martineau rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); 313536c86c85SMat Martineau } 313636c86c85SMat Martineau } 313736c86c85SMat Martineau 31386327eb98SAndrei Emeltchenko static inline void l2cap_txwin_setup(struct l2cap_chan *chan) 31396327eb98SAndrei Emeltchenko { 31406327eb98SAndrei Emeltchenko if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && 3141848566b3SMarcel Holtmann __l2cap_ews_supported(chan->conn)) { 31426327eb98SAndrei Emeltchenko /* use extended control field */ 31436327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 3144836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 3145836be934SAndrei Emeltchenko } else { 31466327eb98SAndrei Emeltchenko chan->tx_win = min_t(u16, chan->tx_win, 31476327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 3148836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; 3149836be934SAndrei Emeltchenko } 3150c20f8e35SMat Martineau chan->ack_win = chan->tx_win; 31516327eb98SAndrei Emeltchenko } 31526327eb98SAndrei Emeltchenko 3153710f9b0aSGustavo F. Padovan static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) 31540a708f8fSGustavo F. Padovan { 31550a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 31560c1bc5c6SGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = chan->mode }; 31570a708f8fSGustavo F. Padovan void *ptr = req->data; 3158c8f79162SAndrei Emeltchenko u16 size; 31590a708f8fSGustavo F. Padovan 316049208c9cSGustavo F. Padovan BT_DBG("chan %p", chan); 31610a708f8fSGustavo F. Padovan 316273ffa904SGustavo F. Padovan if (chan->num_conf_req || chan->num_conf_rsp) 31630a708f8fSGustavo F. Padovan goto done; 31640a708f8fSGustavo F. Padovan 31650c1bc5c6SGustavo F. Padovan switch (chan->mode) { 31660a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 31670a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3168c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) 31690a708f8fSGustavo F. Padovan break; 31700a708f8fSGustavo F. Padovan 3171848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 3172f89cef09SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 3173f89cef09SAndrei Emeltchenko 31740a708f8fSGustavo F. Padovan /* fall through */ 31750a708f8fSGustavo F. Padovan default: 31768c1d787bSGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); 31770a708f8fSGustavo F. Padovan break; 31780a708f8fSGustavo F. Padovan } 31790a708f8fSGustavo F. Padovan 31800a708f8fSGustavo F. Padovan done: 31810c1bc5c6SGustavo F. Padovan if (chan->imtu != L2CAP_DEFAULT_MTU) 31820c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 31830a708f8fSGustavo F. Padovan 31840c1bc5c6SGustavo F. Padovan switch (chan->mode) { 31850a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 31868c1d787bSGustavo F. Padovan if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && 31878c1d787bSGustavo F. Padovan !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) 31880a708f8fSGustavo F. Padovan break; 31890a708f8fSGustavo F. Padovan 31900a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_BASIC; 31910a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 31920a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 31930a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 31940a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 31950a708f8fSGustavo F. Padovan rfc.max_pdu_size = 0; 31960a708f8fSGustavo F. Padovan 31970a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 31980a708f8fSGustavo F. Padovan (unsigned long) &rfc); 31990a708f8fSGustavo F. Padovan break; 32000a708f8fSGustavo F. Padovan 32010a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 32020a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_ERTM; 320347d1ec61SGustavo F. Padovan rfc.max_transmit = chan->max_tx; 320436c86c85SMat Martineau 320536c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 3206c8f79162SAndrei Emeltchenko 3207c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32082d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3209c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3210c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32110a708f8fSGustavo F. Padovan 32126327eb98SAndrei Emeltchenko l2cap_txwin_setup(chan); 32136327eb98SAndrei Emeltchenko 32146327eb98SAndrei Emeltchenko rfc.txwin_size = min_t(u16, chan->tx_win, 32156327eb98SAndrei Emeltchenko L2CAP_DEFAULT_TX_WINDOW); 32160a708f8fSGustavo F. Padovan 32170a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32180a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32190a708f8fSGustavo F. Padovan 3220f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3221f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3222f89cef09SAndrei Emeltchenko 32236327eb98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 32246327eb98SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 32256327eb98SAndrei Emeltchenko chan->tx_win); 322660918918SAndrei Emeltchenko 322760918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 322860918918SAndrei Emeltchenko if (chan->fcs == L2CAP_FCS_NONE || 3229f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 323060918918SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 323160918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 323260918918SAndrei Emeltchenko chan->fcs); 323360918918SAndrei Emeltchenko } 32340a708f8fSGustavo F. Padovan break; 32350a708f8fSGustavo F. Padovan 32360a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3237273759e2SMat Martineau l2cap_txwin_setup(chan); 32380a708f8fSGustavo F. Padovan rfc.mode = L2CAP_MODE_STREAMING; 32390a708f8fSGustavo F. Padovan rfc.txwin_size = 0; 32400a708f8fSGustavo F. Padovan rfc.max_transmit = 0; 32410a708f8fSGustavo F. Padovan rfc.retrans_timeout = 0; 32420a708f8fSGustavo F. Padovan rfc.monitor_timeout = 0; 3243c8f79162SAndrei Emeltchenko 3244c8f79162SAndrei Emeltchenko size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - 32452d792818SGustavo Padovan L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - 3246c8f79162SAndrei Emeltchenko L2CAP_FCS_SIZE); 3247c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 32480a708f8fSGustavo F. Padovan 32490a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 32500a708f8fSGustavo F. Padovan (unsigned long) &rfc); 32510a708f8fSGustavo F. Padovan 3252f89cef09SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) 3253f89cef09SAndrei Emeltchenko l2cap_add_opt_efs(&ptr, chan); 3254f89cef09SAndrei Emeltchenko 325560918918SAndrei Emeltchenko if (chan->conn->feat_mask & L2CAP_FEAT_FCS) 325647d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_NONE || 3257f2592d3eSAndrei Emeltchenko test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { 325847d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 325960918918SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, 326060918918SAndrei Emeltchenko chan->fcs); 32610a708f8fSGustavo F. Padovan } 32620a708f8fSGustavo F. Padovan break; 32630a708f8fSGustavo F. Padovan } 32640a708f8fSGustavo F. Padovan 3265fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 326659e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 32670a708f8fSGustavo F. Padovan 32680a708f8fSGustavo F. Padovan return ptr - data; 32690a708f8fSGustavo F. Padovan } 32700a708f8fSGustavo F. Padovan 327173ffa904SGustavo F. Padovan static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) 32720a708f8fSGustavo F. Padovan { 32730a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 32740a708f8fSGustavo F. Padovan void *ptr = rsp->data; 327573ffa904SGustavo F. Padovan void *req = chan->conf_req; 327673ffa904SGustavo F. Padovan int len = chan->conf_len; 32770a708f8fSGustavo F. Padovan int type, hint, olen; 32780a708f8fSGustavo F. Padovan unsigned long val; 32790a708f8fSGustavo F. Padovan struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 328042dceae2SAndrei Emeltchenko struct l2cap_conf_efs efs; 328142dceae2SAndrei Emeltchenko u8 remote_efs = 0; 32820a708f8fSGustavo F. Padovan u16 mtu = L2CAP_DEFAULT_MTU; 32830a708f8fSGustavo F. Padovan u16 result = L2CAP_CONF_SUCCESS; 3284c8f79162SAndrei Emeltchenko u16 size; 32850a708f8fSGustavo F. Padovan 328673ffa904SGustavo F. Padovan BT_DBG("chan %p", chan); 32870a708f8fSGustavo F. Padovan 32880a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 32890a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&req, &type, &olen, &val); 32900a708f8fSGustavo F. Padovan 32910a708f8fSGustavo F. Padovan hint = type & L2CAP_CONF_HINT; 32920a708f8fSGustavo F. Padovan type &= L2CAP_CONF_MASK; 32930a708f8fSGustavo F. Padovan 32940a708f8fSGustavo F. Padovan switch (type) { 32950a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 32960a708f8fSGustavo F. Padovan mtu = val; 32970a708f8fSGustavo F. Padovan break; 32980a708f8fSGustavo F. Padovan 32990a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 33000c1bc5c6SGustavo F. Padovan chan->flush_to = val; 33010a708f8fSGustavo F. Padovan break; 33020a708f8fSGustavo F. Padovan 33030a708f8fSGustavo F. Padovan case L2CAP_CONF_QOS: 33040a708f8fSGustavo F. Padovan break; 33050a708f8fSGustavo F. Padovan 33060a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 33070a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 33080a708f8fSGustavo F. Padovan memcpy(&rfc, (void *) val, olen); 33090a708f8fSGustavo F. Padovan break; 33100a708f8fSGustavo F. Padovan 33110a708f8fSGustavo F. Padovan case L2CAP_CONF_FCS: 33120a708f8fSGustavo F. Padovan if (val == L2CAP_FCS_NONE) 3313f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, &chan->conf_state); 331442dceae2SAndrei Emeltchenko break; 33150a708f8fSGustavo F. Padovan 331642dceae2SAndrei Emeltchenko case L2CAP_CONF_EFS: 331742dceae2SAndrei Emeltchenko remote_efs = 1; 331842dceae2SAndrei Emeltchenko if (olen == sizeof(efs)) 331942dceae2SAndrei Emeltchenko memcpy(&efs, (void *) val, olen); 33200a708f8fSGustavo F. Padovan break; 33210a708f8fSGustavo F. Padovan 33226327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3323848566b3SMarcel Holtmann if (!chan->conn->hs_enabled) 33246327eb98SAndrei Emeltchenko return -ECONNREFUSED; 33256327eb98SAndrei Emeltchenko 33266327eb98SAndrei Emeltchenko set_bit(FLAG_EXT_CTRL, &chan->flags); 33276327eb98SAndrei Emeltchenko set_bit(CONF_EWS_RECV, &chan->conf_state); 3328836be934SAndrei Emeltchenko chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; 33296327eb98SAndrei Emeltchenko chan->remote_tx_win = val; 33300a708f8fSGustavo F. Padovan break; 33310a708f8fSGustavo F. Padovan 33320a708f8fSGustavo F. Padovan default: 33330a708f8fSGustavo F. Padovan if (hint) 33340a708f8fSGustavo F. Padovan break; 33350a708f8fSGustavo F. Padovan 33360a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNKNOWN; 33370a708f8fSGustavo F. Padovan *((u8 *) ptr++) = type; 33380a708f8fSGustavo F. Padovan break; 33390a708f8fSGustavo F. Padovan } 33400a708f8fSGustavo F. Padovan } 33410a708f8fSGustavo F. Padovan 334273ffa904SGustavo F. Padovan if (chan->num_conf_rsp || chan->num_conf_req > 1) 33430a708f8fSGustavo F. Padovan goto done; 33440a708f8fSGustavo F. Padovan 33450c1bc5c6SGustavo F. Padovan switch (chan->mode) { 33460a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 33470a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 3348c1360a1cSGustavo F. Padovan if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { 33490c1bc5c6SGustavo F. Padovan chan->mode = l2cap_select_mode(rfc.mode, 33508c1d787bSGustavo F. Padovan chan->conn->feat_mask); 33510a708f8fSGustavo F. Padovan break; 33520a708f8fSGustavo F. Padovan } 33530a708f8fSGustavo F. Padovan 335442dceae2SAndrei Emeltchenko if (remote_efs) { 3355848566b3SMarcel Holtmann if (__l2cap_efs_supported(chan->conn)) 335642dceae2SAndrei Emeltchenko set_bit(FLAG_EFS_ENABLE, &chan->flags); 335742dceae2SAndrei Emeltchenko else 335842dceae2SAndrei Emeltchenko return -ECONNREFUSED; 335942dceae2SAndrei Emeltchenko } 336042dceae2SAndrei Emeltchenko 33610c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) 33620a708f8fSGustavo F. Padovan return -ECONNREFUSED; 33630a708f8fSGustavo F. Padovan 33640a708f8fSGustavo F. Padovan break; 33650a708f8fSGustavo F. Padovan } 33660a708f8fSGustavo F. Padovan 33670a708f8fSGustavo F. Padovan done: 33680c1bc5c6SGustavo F. Padovan if (chan->mode != rfc.mode) { 33690a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 33700c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 33710a708f8fSGustavo F. Padovan 337273ffa904SGustavo F. Padovan if (chan->num_conf_rsp == 1) 33730a708f8fSGustavo F. Padovan return -ECONNREFUSED; 33740a708f8fSGustavo F. Padovan 33752d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 33762d792818SGustavo Padovan (unsigned long) &rfc); 33770a708f8fSGustavo F. Padovan } 33780a708f8fSGustavo F. Padovan 33790a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) { 33800a708f8fSGustavo F. Padovan /* Configure output options and let the other side know 33810a708f8fSGustavo F. Padovan * which ones we don't like. */ 33820a708f8fSGustavo F. Padovan 33830a708f8fSGustavo F. Padovan if (mtu < L2CAP_DEFAULT_MIN_MTU) 33840a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 33850a708f8fSGustavo F. Padovan else { 33860c1bc5c6SGustavo F. Padovan chan->omtu = mtu; 3387c1360a1cSGustavo F. Padovan set_bit(CONF_MTU_DONE, &chan->conf_state); 33880a708f8fSGustavo F. Padovan } 33890c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); 33900a708f8fSGustavo F. Padovan 339142dceae2SAndrei Emeltchenko if (remote_efs) { 339242dceae2SAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 339342dceae2SAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 339442dceae2SAndrei Emeltchenko efs.stype != chan->local_stype) { 339542dceae2SAndrei Emeltchenko 339642dceae2SAndrei Emeltchenko result = L2CAP_CONF_UNACCEPT; 339742dceae2SAndrei Emeltchenko 339842dceae2SAndrei Emeltchenko if (chan->num_conf_req >= 1) 339942dceae2SAndrei Emeltchenko return -ECONNREFUSED; 340042dceae2SAndrei Emeltchenko 340142dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 340242dceae2SAndrei Emeltchenko sizeof(efs), 340342dceae2SAndrei Emeltchenko (unsigned long) &efs); 34040e8b207eSAndrei Emeltchenko } else { 34053e6b3b95SGustavo F. Padovan /* Send PENDING Conf Rsp */ 34060e8b207eSAndrei Emeltchenko result = L2CAP_CONF_PENDING; 34070e8b207eSAndrei Emeltchenko set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 340842dceae2SAndrei Emeltchenko } 340942dceae2SAndrei Emeltchenko } 341042dceae2SAndrei Emeltchenko 34110a708f8fSGustavo F. Padovan switch (rfc.mode) { 34120a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 341347d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3414c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34150a708f8fSGustavo F. Padovan break; 34160a708f8fSGustavo F. Padovan 34170a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 34186327eb98SAndrei Emeltchenko if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) 34192c03a7a4SGustavo F. Padovan chan->remote_tx_win = rfc.txwin_size; 34206327eb98SAndrei Emeltchenko else 34216327eb98SAndrei Emeltchenko rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; 34226327eb98SAndrei Emeltchenko 34232c03a7a4SGustavo F. Padovan chan->remote_max_tx = rfc.max_transmit; 34240a708f8fSGustavo F. Padovan 3425c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 34262d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 34272d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3428c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3429c8f79162SAndrei Emeltchenko chan->remote_mps = size; 34300a708f8fSGustavo F. Padovan 343136c86c85SMat Martineau __l2cap_set_ertm_timeouts(chan, &rfc); 34320a708f8fSGustavo F. Padovan 3433c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34340a708f8fSGustavo F. Padovan 34350a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 34360a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 34370a708f8fSGustavo F. Padovan 343842dceae2SAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 343942dceae2SAndrei Emeltchenko chan->remote_id = efs.id; 344042dceae2SAndrei Emeltchenko chan->remote_stype = efs.stype; 344142dceae2SAndrei Emeltchenko chan->remote_msdu = le16_to_cpu(efs.msdu); 344242dceae2SAndrei Emeltchenko chan->remote_flush_to = 344342dceae2SAndrei Emeltchenko le32_to_cpu(efs.flush_to); 344442dceae2SAndrei Emeltchenko chan->remote_acc_lat = 344542dceae2SAndrei Emeltchenko le32_to_cpu(efs.acc_lat); 344642dceae2SAndrei Emeltchenko chan->remote_sdu_itime = 344742dceae2SAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 344842dceae2SAndrei Emeltchenko l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, 34492d792818SGustavo Padovan sizeof(efs), 34502d792818SGustavo Padovan (unsigned long) &efs); 345142dceae2SAndrei Emeltchenko } 34520a708f8fSGustavo F. Padovan break; 34530a708f8fSGustavo F. Padovan 34540a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 3455c8f79162SAndrei Emeltchenko size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), 34562d792818SGustavo Padovan chan->conn->mtu - L2CAP_EXT_HDR_SIZE - 34572d792818SGustavo Padovan L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); 3458c8f79162SAndrei Emeltchenko rfc.max_pdu_size = cpu_to_le16(size); 3459c8f79162SAndrei Emeltchenko chan->remote_mps = size; 34600a708f8fSGustavo F. Padovan 3461c1360a1cSGustavo F. Padovan set_bit(CONF_MODE_DONE, &chan->conf_state); 34620a708f8fSGustavo F. Padovan 34632d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), 34642d792818SGustavo Padovan (unsigned long) &rfc); 34650a708f8fSGustavo F. Padovan 34660a708f8fSGustavo F. Padovan break; 34670a708f8fSGustavo F. Padovan 34680a708f8fSGustavo F. Padovan default: 34690a708f8fSGustavo F. Padovan result = L2CAP_CONF_UNACCEPT; 34700a708f8fSGustavo F. Padovan 34710a708f8fSGustavo F. Padovan memset(&rfc, 0, sizeof(rfc)); 34720c1bc5c6SGustavo F. Padovan rfc.mode = chan->mode; 34730a708f8fSGustavo F. Padovan } 34740a708f8fSGustavo F. Padovan 34750a708f8fSGustavo F. Padovan if (result == L2CAP_CONF_SUCCESS) 3476c1360a1cSGustavo F. Padovan set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 34770a708f8fSGustavo F. Padovan } 3478fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 34790a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 348059e54bd1SAndrei Emeltchenko rsp->flags = __constant_cpu_to_le16(0); 34810a708f8fSGustavo F. Padovan 34820a708f8fSGustavo F. Padovan return ptr - data; 34830a708f8fSGustavo F. Padovan } 34840a708f8fSGustavo F. Padovan 34852d792818SGustavo Padovan static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, 34862d792818SGustavo Padovan void *data, u16 *result) 34870a708f8fSGustavo F. Padovan { 34880a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = data; 34890a708f8fSGustavo F. Padovan void *ptr = req->data; 34900a708f8fSGustavo F. Padovan int type, olen; 34910a708f8fSGustavo F. Padovan unsigned long val; 349236e999a8SMat Martineau struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; 349366af7aafSAndrei Emeltchenko struct l2cap_conf_efs efs; 34940a708f8fSGustavo F. Padovan 3495fe4128e0SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); 34960a708f8fSGustavo F. Padovan 34970a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 34980a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 34990a708f8fSGustavo F. Padovan 35000a708f8fSGustavo F. Padovan switch (type) { 35010a708f8fSGustavo F. Padovan case L2CAP_CONF_MTU: 35020a708f8fSGustavo F. Padovan if (val < L2CAP_DEFAULT_MIN_MTU) { 35030a708f8fSGustavo F. Padovan *result = L2CAP_CONF_UNACCEPT; 35040c1bc5c6SGustavo F. Padovan chan->imtu = L2CAP_DEFAULT_MIN_MTU; 35050a708f8fSGustavo F. Padovan } else 35060c1bc5c6SGustavo F. Padovan chan->imtu = val; 35070c1bc5c6SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); 35080a708f8fSGustavo F. Padovan break; 35090a708f8fSGustavo F. Padovan 35100a708f8fSGustavo F. Padovan case L2CAP_CONF_FLUSH_TO: 35110c1bc5c6SGustavo F. Padovan chan->flush_to = val; 35120a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 35130c1bc5c6SGustavo F. Padovan 2, chan->flush_to); 35140a708f8fSGustavo F. Padovan break; 35150a708f8fSGustavo F. Padovan 35160a708f8fSGustavo F. Padovan case L2CAP_CONF_RFC: 35170a708f8fSGustavo F. Padovan if (olen == sizeof(rfc)) 35180a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 35190a708f8fSGustavo F. Padovan 3520c1360a1cSGustavo F. Padovan if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && 35210c1bc5c6SGustavo F. Padovan rfc.mode != chan->mode) 35220a708f8fSGustavo F. Padovan return -ECONNREFUSED; 35230a708f8fSGustavo F. Padovan 352447d1ec61SGustavo F. Padovan chan->fcs = 0; 35250a708f8fSGustavo F. Padovan 35260a708f8fSGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, 35270a708f8fSGustavo F. Padovan sizeof(rfc), (unsigned long) &rfc); 35280a708f8fSGustavo F. Padovan break; 35296327eb98SAndrei Emeltchenko 35306327eb98SAndrei Emeltchenko case L2CAP_CONF_EWS: 3531c20f8e35SMat Martineau chan->ack_win = min_t(u16, val, chan->ack_win); 35323e6b3b95SGustavo F. Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, 35333e6b3b95SGustavo F. Padovan chan->tx_win); 35346327eb98SAndrei Emeltchenko break; 353566af7aafSAndrei Emeltchenko 353666af7aafSAndrei Emeltchenko case L2CAP_CONF_EFS: 353766af7aafSAndrei Emeltchenko if (olen == sizeof(efs)) 353866af7aafSAndrei Emeltchenko memcpy(&efs, (void *)val, olen); 353966af7aafSAndrei Emeltchenko 354066af7aafSAndrei Emeltchenko if (chan->local_stype != L2CAP_SERV_NOTRAFIC && 354166af7aafSAndrei Emeltchenko efs.stype != L2CAP_SERV_NOTRAFIC && 354266af7aafSAndrei Emeltchenko efs.stype != chan->local_stype) 354366af7aafSAndrei Emeltchenko return -ECONNREFUSED; 354466af7aafSAndrei Emeltchenko 35452d792818SGustavo Padovan l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), 35462d792818SGustavo Padovan (unsigned long) &efs); 354766af7aafSAndrei Emeltchenko break; 3548cbabee78SAndrei Emeltchenko 3549cbabee78SAndrei Emeltchenko case L2CAP_CONF_FCS: 3550cbabee78SAndrei Emeltchenko if (*result == L2CAP_CONF_PENDING) 3551cbabee78SAndrei Emeltchenko if (val == L2CAP_FCS_NONE) 3552f2592d3eSAndrei Emeltchenko set_bit(CONF_RECV_NO_FCS, 3553cbabee78SAndrei Emeltchenko &chan->conf_state); 3554cbabee78SAndrei Emeltchenko break; 35550a708f8fSGustavo F. Padovan } 35560a708f8fSGustavo F. Padovan } 35570a708f8fSGustavo F. Padovan 35580c1bc5c6SGustavo F. Padovan if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) 35590a708f8fSGustavo F. Padovan return -ECONNREFUSED; 35600a708f8fSGustavo F. Padovan 35610c1bc5c6SGustavo F. Padovan chan->mode = rfc.mode; 35620a708f8fSGustavo F. Padovan 35630e8b207eSAndrei Emeltchenko if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { 35640a708f8fSGustavo F. Padovan switch (rfc.mode) { 35650a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 356647d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 356747d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 356847d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3569c20f8e35SMat Martineau if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) 3570c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3571c20f8e35SMat Martineau rfc.txwin_size); 357266af7aafSAndrei Emeltchenko 357366af7aafSAndrei Emeltchenko if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { 357466af7aafSAndrei Emeltchenko chan->local_msdu = le16_to_cpu(efs.msdu); 357566af7aafSAndrei Emeltchenko chan->local_sdu_itime = 357666af7aafSAndrei Emeltchenko le32_to_cpu(efs.sdu_itime); 357766af7aafSAndrei Emeltchenko chan->local_acc_lat = le32_to_cpu(efs.acc_lat); 357866af7aafSAndrei Emeltchenko chan->local_flush_to = 357966af7aafSAndrei Emeltchenko le32_to_cpu(efs.flush_to); 358066af7aafSAndrei Emeltchenko } 35810a708f8fSGustavo F. Padovan break; 358266af7aafSAndrei Emeltchenko 35830a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 358447d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 35850a708f8fSGustavo F. Padovan } 35860a708f8fSGustavo F. Padovan } 35870a708f8fSGustavo F. Padovan 3588fe4128e0SGustavo F. Padovan req->dcid = cpu_to_le16(chan->dcid); 358959e54bd1SAndrei Emeltchenko req->flags = __constant_cpu_to_le16(0); 35900a708f8fSGustavo F. Padovan 35910a708f8fSGustavo F. Padovan return ptr - data; 35920a708f8fSGustavo F. Padovan } 35930a708f8fSGustavo F. Padovan 35942d792818SGustavo Padovan static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, 35952d792818SGustavo Padovan u16 result, u16 flags) 35960a708f8fSGustavo F. Padovan { 35970a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = data; 35980a708f8fSGustavo F. Padovan void *ptr = rsp->data; 35990a708f8fSGustavo F. Padovan 3600fe4128e0SGustavo F. Padovan BT_DBG("chan %p", chan); 36010a708f8fSGustavo F. Padovan 3602fe4128e0SGustavo F. Padovan rsp->scid = cpu_to_le16(chan->dcid); 36030a708f8fSGustavo F. Padovan rsp->result = cpu_to_le16(result); 36040a708f8fSGustavo F. Padovan rsp->flags = cpu_to_le16(flags); 36050a708f8fSGustavo F. Padovan 36060a708f8fSGustavo F. Padovan return ptr - data; 36070a708f8fSGustavo F. Padovan } 36080a708f8fSGustavo F. Padovan 36098c1d787bSGustavo F. Padovan void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) 3610710f9b0aSGustavo F. Padovan { 3611710f9b0aSGustavo F. Padovan struct l2cap_conn_rsp rsp; 36128c1d787bSGustavo F. Padovan struct l2cap_conn *conn = chan->conn; 3613710f9b0aSGustavo F. Padovan u8 buf[128]; 3614439f34acSAndrei Emeltchenko u8 rsp_code; 3615710f9b0aSGustavo F. Padovan 3616fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 3617fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 3618ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 3619ac73498cSAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 3620439f34acSAndrei Emeltchenko 3621439f34acSAndrei Emeltchenko if (chan->hs_hcon) 3622439f34acSAndrei Emeltchenko rsp_code = L2CAP_CREATE_CHAN_RSP; 3623439f34acSAndrei Emeltchenko else 3624439f34acSAndrei Emeltchenko rsp_code = L2CAP_CONN_RSP; 3625439f34acSAndrei Emeltchenko 3626439f34acSAndrei Emeltchenko BT_DBG("chan %p rsp_code %u", chan, rsp_code); 3627439f34acSAndrei Emeltchenko 3628439f34acSAndrei Emeltchenko l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); 3629710f9b0aSGustavo F. Padovan 3630c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 3631710f9b0aSGustavo F. Padovan return; 3632710f9b0aSGustavo F. Padovan 3633710f9b0aSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 3634710f9b0aSGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 3635710f9b0aSGustavo F. Padovan chan->num_conf_req++; 3636710f9b0aSGustavo F. Padovan } 3637710f9b0aSGustavo F. Padovan 363847d1ec61SGustavo F. Padovan static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) 36390a708f8fSGustavo F. Padovan { 36400a708f8fSGustavo F. Padovan int type, olen; 36410a708f8fSGustavo F. Padovan unsigned long val; 3642c20f8e35SMat Martineau /* Use sane default values in case a misbehaving remote device 3643c20f8e35SMat Martineau * did not send an RFC or extended window size option. 3644c20f8e35SMat Martineau */ 3645c20f8e35SMat Martineau u16 txwin_ext = chan->ack_win; 3646c20f8e35SMat Martineau struct l2cap_conf_rfc rfc = { 3647c20f8e35SMat Martineau .mode = chan->mode, 3648c20f8e35SMat Martineau .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), 3649c20f8e35SMat Martineau .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), 3650c20f8e35SMat Martineau .max_pdu_size = cpu_to_le16(chan->imtu), 3651c20f8e35SMat Martineau .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), 3652c20f8e35SMat Martineau }; 36530a708f8fSGustavo F. Padovan 365447d1ec61SGustavo F. Padovan BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); 36550a708f8fSGustavo F. Padovan 36560c1bc5c6SGustavo F. Padovan if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) 36570a708f8fSGustavo F. Padovan return; 36580a708f8fSGustavo F. Padovan 36590a708f8fSGustavo F. Padovan while (len >= L2CAP_CONF_OPT_SIZE) { 36600a708f8fSGustavo F. Padovan len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); 36610a708f8fSGustavo F. Padovan 3662c20f8e35SMat Martineau switch (type) { 3663c20f8e35SMat Martineau case L2CAP_CONF_RFC: 3664c20f8e35SMat Martineau if (olen == sizeof(rfc)) 36650a708f8fSGustavo F. Padovan memcpy(&rfc, (void *)val, olen); 3666c20f8e35SMat Martineau break; 3667c20f8e35SMat Martineau case L2CAP_CONF_EWS: 3668c20f8e35SMat Martineau txwin_ext = val; 3669c20f8e35SMat Martineau break; 3670c20f8e35SMat Martineau } 36710a708f8fSGustavo F. Padovan } 36720a708f8fSGustavo F. Padovan 36730a708f8fSGustavo F. Padovan switch (rfc.mode) { 36740a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 367547d1ec61SGustavo F. Padovan chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); 367647d1ec61SGustavo F. Padovan chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); 367747d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 3678c20f8e35SMat Martineau if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 3679c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); 3680c20f8e35SMat Martineau else 3681c20f8e35SMat Martineau chan->ack_win = min_t(u16, chan->ack_win, 3682c20f8e35SMat Martineau rfc.txwin_size); 36830a708f8fSGustavo F. Padovan break; 36840a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 368547d1ec61SGustavo F. Padovan chan->mps = le16_to_cpu(rfc.max_pdu_size); 36860a708f8fSGustavo F. Padovan } 36870a708f8fSGustavo F. Padovan } 36880a708f8fSGustavo F. Padovan 36892d792818SGustavo Padovan static inline int l2cap_command_rej(struct l2cap_conn *conn, 3690cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3691cb3b3152SJohan Hedberg u8 *data) 36920a708f8fSGustavo F. Padovan { 3693e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; 36940a708f8fSGustavo F. Padovan 3695cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rej)) 3696cb3b3152SJohan Hedberg return -EPROTO; 3697cb3b3152SJohan Hedberg 3698e2fd318eSIlia Kolomisnky if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) 36990a708f8fSGustavo F. Padovan return 0; 37000a708f8fSGustavo F. Padovan 37010a708f8fSGustavo F. Padovan if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && 37020a708f8fSGustavo F. Padovan cmd->ident == conn->info_ident) { 370317cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 37040a708f8fSGustavo F. Padovan 37050a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 37060a708f8fSGustavo F. Padovan conn->info_ident = 0; 37070a708f8fSGustavo F. Padovan 37080a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 37090a708f8fSGustavo F. Padovan } 37100a708f8fSGustavo F. Padovan 37110a708f8fSGustavo F. Padovan return 0; 37120a708f8fSGustavo F. Padovan } 37130a708f8fSGustavo F. Padovan 37141700915fSMat Martineau static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, 37151700915fSMat Martineau struct l2cap_cmd_hdr *cmd, 37164c89b6aaSMat Martineau u8 *data, u8 rsp_code, u8 amp_id) 37170a708f8fSGustavo F. Padovan { 37180a708f8fSGustavo F. Padovan struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; 37190a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 372023691d75SGustavo F. Padovan struct l2cap_chan *chan = NULL, *pchan; 37210a708f8fSGustavo F. Padovan struct sock *parent, *sk = NULL; 37220a708f8fSGustavo F. Padovan int result, status = L2CAP_CS_NO_INFO; 37230a708f8fSGustavo F. Padovan 37240a708f8fSGustavo F. Padovan u16 dcid = 0, scid = __le16_to_cpu(req->scid); 37250a708f8fSGustavo F. Padovan __le16 psm = req->psm; 37260a708f8fSGustavo F. Padovan 3727097db76cSAndrei Emeltchenko BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); 37280a708f8fSGustavo F. Padovan 37290a708f8fSGustavo F. Padovan /* Check if we have socket listening on psm */ 3730c2287681SIdo Yariv pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); 373123691d75SGustavo F. Padovan if (!pchan) { 37320a708f8fSGustavo F. Padovan result = L2CAP_CR_BAD_PSM; 37330a708f8fSGustavo F. Padovan goto sendresp; 37340a708f8fSGustavo F. Padovan } 37350a708f8fSGustavo F. Padovan 373623691d75SGustavo F. Padovan parent = pchan->sk; 373723691d75SGustavo F. Padovan 37383df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 3739aa2ac881SGustavo F. Padovan lock_sock(parent); 37400a708f8fSGustavo F. Padovan 37410a708f8fSGustavo F. Padovan /* Check if the ACL is secure enough (if not SDP) */ 37422983fd68SAndrei Emeltchenko if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && 37430a708f8fSGustavo F. Padovan !hci_conn_check_link_mode(conn->hcon)) { 37449f5a0d7bSAndrei Emeltchenko conn->disc_reason = HCI_ERROR_AUTH_FAILURE; 37450a708f8fSGustavo F. Padovan result = L2CAP_CR_SEC_BLOCK; 37460a708f8fSGustavo F. Padovan goto response; 37470a708f8fSGustavo F. Padovan } 37480a708f8fSGustavo F. Padovan 37490a708f8fSGustavo F. Padovan result = L2CAP_CR_NO_MEM; 37500a708f8fSGustavo F. Padovan 37512dfa1003SGustavo Padovan /* Check if we already have channel with that dcid */ 37522dfa1003SGustavo Padovan if (__l2cap_get_chan_by_dcid(conn, scid)) 37532dfa1003SGustavo Padovan goto response; 37542dfa1003SGustavo Padovan 375580b98027SGustavo Padovan chan = pchan->ops->new_connection(pchan); 375680808e43SGustavo F. Padovan if (!chan) 37570a708f8fSGustavo F. Padovan goto response; 37580a708f8fSGustavo F. Padovan 375980808e43SGustavo F. Padovan sk = chan->sk; 376080808e43SGustavo F. Padovan 3761330b6c15SSyam Sidhardhan /* For certain devices (ex: HID mouse), support for authentication, 3762330b6c15SSyam Sidhardhan * pairing and bonding is optional. For such devices, inorder to avoid 3763330b6c15SSyam Sidhardhan * the ACL alive for too long after L2CAP disconnection, reset the ACL 3764330b6c15SSyam Sidhardhan * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. 3765330b6c15SSyam Sidhardhan */ 3766330b6c15SSyam Sidhardhan conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; 3767330b6c15SSyam Sidhardhan 37680a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->src, conn->src); 37690a708f8fSGustavo F. Padovan bacpy(&bt_sk(sk)->dst, conn->dst); 3770fe4128e0SGustavo F. Padovan chan->psm = psm; 3771fe4128e0SGustavo F. Padovan chan->dcid = scid; 37721700915fSMat Martineau chan->local_amp_id = amp_id; 37730a708f8fSGustavo F. Padovan 37746be36555SAndrei Emeltchenko __l2cap_chan_add(conn, chan); 377548454079SGustavo F. Padovan 3776fe4128e0SGustavo F. Padovan dcid = chan->scid; 37770a708f8fSGustavo F. Padovan 3778c9b66675SGustavo F. Padovan __set_chan_timer(chan, sk->sk_sndtimeo); 37790a708f8fSGustavo F. Padovan 3780fc7f8a7eSGustavo F. Padovan chan->ident = cmd->ident; 37810a708f8fSGustavo F. Padovan 37820a708f8fSGustavo F. Padovan if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { 3783d45fc423SGustavo F. Padovan if (l2cap_chan_check_security(chan)) { 3784c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 37850e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 37860a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 37870a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHOR_PEND; 37882dc4e510SGustavo Padovan chan->ops->defer(chan); 37890a708f8fSGustavo F. Padovan } else { 37901700915fSMat Martineau /* Force pending result for AMP controllers. 37911700915fSMat Martineau * The connection will succeed after the 37921700915fSMat Martineau * physical link is up. 37931700915fSMat Martineau */ 37941700915fSMat Martineau if (amp_id) { 37951700915fSMat Martineau __l2cap_state_change(chan, BT_CONNECT2); 37961700915fSMat Martineau result = L2CAP_CR_PEND; 37971700915fSMat Martineau } else { 37980e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 37990a708f8fSGustavo F. Padovan result = L2CAP_CR_SUCCESS; 38001700915fSMat Martineau } 38010a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38020a708f8fSGustavo F. Padovan } 38030a708f8fSGustavo F. Padovan } else { 38040e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 38050a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38060a708f8fSGustavo F. Padovan status = L2CAP_CS_AUTHEN_PEND; 38070a708f8fSGustavo F. Padovan } 38080a708f8fSGustavo F. Padovan } else { 38090e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONNECT2); 38100a708f8fSGustavo F. Padovan result = L2CAP_CR_PEND; 38110a708f8fSGustavo F. Padovan status = L2CAP_CS_NO_INFO; 38120a708f8fSGustavo F. Padovan } 38130a708f8fSGustavo F. Padovan 38140a708f8fSGustavo F. Padovan response: 3815aa2ac881SGustavo F. Padovan release_sock(parent); 38163df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 38170a708f8fSGustavo F. Padovan 38180a708f8fSGustavo F. Padovan sendresp: 38190a708f8fSGustavo F. Padovan rsp.scid = cpu_to_le16(scid); 38200a708f8fSGustavo F. Padovan rsp.dcid = cpu_to_le16(dcid); 38210a708f8fSGustavo F. Padovan rsp.result = cpu_to_le16(result); 38220a708f8fSGustavo F. Padovan rsp.status = cpu_to_le16(status); 38234c89b6aaSMat Martineau l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); 38240a708f8fSGustavo F. Padovan 38250a708f8fSGustavo F. Padovan if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { 38260a708f8fSGustavo F. Padovan struct l2cap_info_req info; 3827ac73498cSAndrei Emeltchenko info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 38280a708f8fSGustavo F. Padovan 38290a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; 38300a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 38310a708f8fSGustavo F. Padovan 3832ba13ccd9SMarcel Holtmann schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); 38330a708f8fSGustavo F. Padovan 38342d792818SGustavo Padovan l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, 38352d792818SGustavo Padovan sizeof(info), &info); 38360a708f8fSGustavo F. Padovan } 38370a708f8fSGustavo F. Padovan 3838c1360a1cSGustavo F. Padovan if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && 38390a708f8fSGustavo F. Padovan result == L2CAP_CR_SUCCESS) { 38400a708f8fSGustavo F. Padovan u8 buf[128]; 3841c1360a1cSGustavo F. Padovan set_bit(CONF_REQ_SENT, &chan->conf_state); 38420a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 384373ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 384473ffa904SGustavo F. Padovan chan->num_conf_req++; 38450a708f8fSGustavo F. Padovan } 38461700915fSMat Martineau 38471700915fSMat Martineau return chan; 38484c89b6aaSMat Martineau } 38490a708f8fSGustavo F. Padovan 38504c89b6aaSMat Martineau static int l2cap_connect_req(struct l2cap_conn *conn, 3851cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) 38524c89b6aaSMat Martineau { 38537b064edaSJaganath Kanakkassery struct hci_dev *hdev = conn->hcon->hdev; 38547b064edaSJaganath Kanakkassery struct hci_conn *hcon = conn->hcon; 38557b064edaSJaganath Kanakkassery 3856cb3b3152SJohan Hedberg if (cmd_len < sizeof(struct l2cap_conn_req)) 3857cb3b3152SJohan Hedberg return -EPROTO; 3858cb3b3152SJohan Hedberg 38597b064edaSJaganath Kanakkassery hci_dev_lock(hdev); 38607b064edaSJaganath Kanakkassery if (test_bit(HCI_MGMT, &hdev->dev_flags) && 38617b064edaSJaganath Kanakkassery !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) 38627b064edaSJaganath Kanakkassery mgmt_device_connected(hdev, &hcon->dst, hcon->type, 38637b064edaSJaganath Kanakkassery hcon->dst_type, 0, NULL, 0, 38647b064edaSJaganath Kanakkassery hcon->dev_class); 38657b064edaSJaganath Kanakkassery hci_dev_unlock(hdev); 38667b064edaSJaganath Kanakkassery 3867300229f9SGustavo Padovan l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); 38680a708f8fSGustavo F. Padovan return 0; 38690a708f8fSGustavo F. Padovan } 38700a708f8fSGustavo F. Padovan 38715909cf30SMat Martineau static int l2cap_connect_create_rsp(struct l2cap_conn *conn, 3872cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 3873cb3b3152SJohan Hedberg u8 *data) 38740a708f8fSGustavo F. Padovan { 38750a708f8fSGustavo F. Padovan struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; 38760a708f8fSGustavo F. Padovan u16 scid, dcid, result, status; 387748454079SGustavo F. Padovan struct l2cap_chan *chan; 38780a708f8fSGustavo F. Padovan u8 req[128]; 38793df91ea2SAndrei Emeltchenko int err; 38800a708f8fSGustavo F. Padovan 3881cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 3882cb3b3152SJohan Hedberg return -EPROTO; 3883cb3b3152SJohan Hedberg 38840a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 38850a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 38860a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 38870a708f8fSGustavo F. Padovan status = __le16_to_cpu(rsp->status); 38880a708f8fSGustavo F. Padovan 38891b009c98SAndrei Emeltchenko BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", 38901b009c98SAndrei Emeltchenko dcid, scid, result, status); 38910a708f8fSGustavo F. Padovan 38923df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 38933df91ea2SAndrei Emeltchenko 38940a708f8fSGustavo F. Padovan if (scid) { 38953df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 38963df91ea2SAndrei Emeltchenko if (!chan) { 389721870b52SJohan Hedberg err = -EBADSLT; 38983df91ea2SAndrei Emeltchenko goto unlock; 38993df91ea2SAndrei Emeltchenko } 39000a708f8fSGustavo F. Padovan } else { 39013df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_ident(conn, cmd->ident); 39023df91ea2SAndrei Emeltchenko if (!chan) { 390321870b52SJohan Hedberg err = -EBADSLT; 39043df91ea2SAndrei Emeltchenko goto unlock; 39053df91ea2SAndrei Emeltchenko } 39060a708f8fSGustavo F. Padovan } 39070a708f8fSGustavo F. Padovan 39083df91ea2SAndrei Emeltchenko err = 0; 39093df91ea2SAndrei Emeltchenko 39106be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 391148454079SGustavo F. Padovan 39120a708f8fSGustavo F. Padovan switch (result) { 39130a708f8fSGustavo F. Padovan case L2CAP_CR_SUCCESS: 391489bc500eSGustavo F. Padovan l2cap_state_change(chan, BT_CONFIG); 3915fc7f8a7eSGustavo F. Padovan chan->ident = 0; 3916fe4128e0SGustavo F. Padovan chan->dcid = dcid; 3917c1360a1cSGustavo F. Padovan clear_bit(CONF_CONNECT_PEND, &chan->conf_state); 39180a708f8fSGustavo F. Padovan 3919c1360a1cSGustavo F. Padovan if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) 39200a708f8fSGustavo F. Padovan break; 39210a708f8fSGustavo F. Padovan 39220a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 392373ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, req), req); 392473ffa904SGustavo F. Padovan chan->num_conf_req++; 39250a708f8fSGustavo F. Padovan break; 39260a708f8fSGustavo F. Padovan 39270a708f8fSGustavo F. Padovan case L2CAP_CR_PEND: 3928c1360a1cSGustavo F. Padovan set_bit(CONF_CONNECT_PEND, &chan->conf_state); 39290a708f8fSGustavo F. Padovan break; 39300a708f8fSGustavo F. Padovan 39310a708f8fSGustavo F. Padovan default: 393248454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNREFUSED); 39330a708f8fSGustavo F. Padovan break; 39340a708f8fSGustavo F. Padovan } 39350a708f8fSGustavo F. Padovan 39366be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 39373df91ea2SAndrei Emeltchenko 39383df91ea2SAndrei Emeltchenko unlock: 39393df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 39403df91ea2SAndrei Emeltchenko 39413df91ea2SAndrei Emeltchenko return err; 39420a708f8fSGustavo F. Padovan } 39430a708f8fSGustavo F. Padovan 394447d1ec61SGustavo F. Padovan static inline void set_default_fcs(struct l2cap_chan *chan) 39450a708f8fSGustavo F. Padovan { 39460a708f8fSGustavo F. Padovan /* FCS is enabled only in ERTM or streaming mode, if one or both 39470a708f8fSGustavo F. Padovan * sides request it. 39480a708f8fSGustavo F. Padovan */ 39490c1bc5c6SGustavo F. Padovan if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) 395047d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_NONE; 3951f2592d3eSAndrei Emeltchenko else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) 395247d1ec61SGustavo F. Padovan chan->fcs = L2CAP_FCS_CRC16; 39530a708f8fSGustavo F. Padovan } 39540a708f8fSGustavo F. Padovan 395529d8a590SAndrei Emeltchenko static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, 395629d8a590SAndrei Emeltchenko u8 ident, u16 flags) 395729d8a590SAndrei Emeltchenko { 395829d8a590SAndrei Emeltchenko struct l2cap_conn *conn = chan->conn; 395929d8a590SAndrei Emeltchenko 396029d8a590SAndrei Emeltchenko BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, 396129d8a590SAndrei Emeltchenko flags); 396229d8a590SAndrei Emeltchenko 396329d8a590SAndrei Emeltchenko clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); 396429d8a590SAndrei Emeltchenko set_bit(CONF_OUTPUT_DONE, &chan->conf_state); 396529d8a590SAndrei Emeltchenko 396629d8a590SAndrei Emeltchenko l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, 396729d8a590SAndrei Emeltchenko l2cap_build_conf_rsp(chan, data, 396829d8a590SAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), data); 396929d8a590SAndrei Emeltchenko } 397029d8a590SAndrei Emeltchenko 39712d792818SGustavo Padovan static inline int l2cap_config_req(struct l2cap_conn *conn, 39722d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 39732d792818SGustavo Padovan u8 *data) 39740a708f8fSGustavo F. Padovan { 39750a708f8fSGustavo F. Padovan struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; 39760a708f8fSGustavo F. Padovan u16 dcid, flags; 39770a708f8fSGustavo F. Padovan u8 rsp[64]; 397848454079SGustavo F. Padovan struct l2cap_chan *chan; 39793c588192SMat Martineau int len, err = 0; 39800a708f8fSGustavo F. Padovan 3981cb3b3152SJohan Hedberg if (cmd_len < sizeof(*req)) 3982cb3b3152SJohan Hedberg return -EPROTO; 3983cb3b3152SJohan Hedberg 39840a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 39850a708f8fSGustavo F. Padovan flags = __le16_to_cpu(req->flags); 39860a708f8fSGustavo F. Padovan 39870a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); 39880a708f8fSGustavo F. Padovan 3989baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, dcid); 399048454079SGustavo F. Padovan if (!chan) 399121870b52SJohan Hedberg return -EBADSLT; 39920a708f8fSGustavo F. Padovan 3993033b1142SDavid S. Miller if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { 3994e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_cid rej; 39950a708f8fSGustavo F. Padovan 3996ac73498cSAndrei Emeltchenko rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); 3997e2fd318eSIlia Kolomisnky rej.scid = cpu_to_le16(chan->scid); 3998e2fd318eSIlia Kolomisnky rej.dcid = cpu_to_le16(chan->dcid); 3999e2fd318eSIlia Kolomisnky 40000a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, 40010a708f8fSGustavo F. Padovan sizeof(rej), &rej); 40020a708f8fSGustavo F. Padovan goto unlock; 40030a708f8fSGustavo F. Padovan } 40040a708f8fSGustavo F. Padovan 40050a708f8fSGustavo F. Padovan /* Reject if config buffer is too small. */ 40060a708f8fSGustavo F. Padovan len = cmd_len - sizeof(*req); 4007cb3b3152SJohan Hedberg if (chan->conf_len + len > sizeof(chan->conf_req)) { 40080a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4009fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40100a708f8fSGustavo F. Padovan L2CAP_CONF_REJECT, flags), rsp); 40110a708f8fSGustavo F. Padovan goto unlock; 40120a708f8fSGustavo F. Padovan } 40130a708f8fSGustavo F. Padovan 40140a708f8fSGustavo F. Padovan /* Store config. */ 401573ffa904SGustavo F. Padovan memcpy(chan->conf_req + chan->conf_len, req->data, len); 401673ffa904SGustavo F. Padovan chan->conf_len += len; 40170a708f8fSGustavo F. Padovan 401859e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) { 40190a708f8fSGustavo F. Padovan /* Incomplete config. Send empty response. */ 40200a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, 4021fe4128e0SGustavo F. Padovan l2cap_build_conf_rsp(chan, rsp, 40225325e5bbSAndrei Emeltchenko L2CAP_CONF_SUCCESS, flags), rsp); 40230a708f8fSGustavo F. Padovan goto unlock; 40240a708f8fSGustavo F. Padovan } 40250a708f8fSGustavo F. Padovan 40260a708f8fSGustavo F. Padovan /* Complete config. */ 402773ffa904SGustavo F. Padovan len = l2cap_parse_conf_req(chan, rsp); 40280a708f8fSGustavo F. Padovan if (len < 0) { 40295e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 40300a708f8fSGustavo F. Padovan goto unlock; 40310a708f8fSGustavo F. Padovan } 40320a708f8fSGustavo F. Padovan 40331500109bSMat Martineau chan->ident = cmd->ident; 40340a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); 403573ffa904SGustavo F. Padovan chan->num_conf_rsp++; 40360a708f8fSGustavo F. Padovan 40370a708f8fSGustavo F. Padovan /* Reset config buffer. */ 403873ffa904SGustavo F. Padovan chan->conf_len = 0; 40390a708f8fSGustavo F. Padovan 4040c1360a1cSGustavo F. Padovan if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) 40410a708f8fSGustavo F. Padovan goto unlock; 40420a708f8fSGustavo F. Padovan 4043c1360a1cSGustavo F. Padovan if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 404447d1ec61SGustavo F. Padovan set_default_fcs(chan); 40450a708f8fSGustavo F. Padovan 4046105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4047105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 40483c588192SMat Martineau err = l2cap_ertm_init(chan); 40490a708f8fSGustavo F. Padovan 40503c588192SMat Martineau if (err < 0) 40515e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 40523c588192SMat Martineau else 4053cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 40543c588192SMat Martineau 40550a708f8fSGustavo F. Padovan goto unlock; 40560a708f8fSGustavo F. Padovan } 40570a708f8fSGustavo F. Padovan 4058c1360a1cSGustavo F. Padovan if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { 40590a708f8fSGustavo F. Padovan u8 buf[64]; 40600a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, 406173ffa904SGustavo F. Padovan l2cap_build_conf_req(chan, buf), buf); 406273ffa904SGustavo F. Padovan chan->num_conf_req++; 40630a708f8fSGustavo F. Padovan } 40640a708f8fSGustavo F. Padovan 40650e8b207eSAndrei Emeltchenko /* Got Conf Rsp PENDING from remote side and asume we sent 40660e8b207eSAndrei Emeltchenko Conf Rsp PENDING in the code above */ 40670e8b207eSAndrei Emeltchenko if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && 40680e8b207eSAndrei Emeltchenko test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 40690e8b207eSAndrei Emeltchenko 40700e8b207eSAndrei Emeltchenko /* check compatibility */ 40710e8b207eSAndrei Emeltchenko 407279de886dSAndrei Emeltchenko /* Send rsp for BR/EDR channel */ 4073f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) 407429d8a590SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); 407579de886dSAndrei Emeltchenko else 407679de886dSAndrei Emeltchenko chan->ident = cmd->ident; 40770e8b207eSAndrei Emeltchenko } 40780e8b207eSAndrei Emeltchenko 40790a708f8fSGustavo F. Padovan unlock: 40806be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 40813c588192SMat Martineau return err; 40820a708f8fSGustavo F. Padovan } 40830a708f8fSGustavo F. Padovan 40842d792818SGustavo Padovan static inline int l2cap_config_rsp(struct l2cap_conn *conn, 4085cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4086cb3b3152SJohan Hedberg u8 *data) 40870a708f8fSGustavo F. Padovan { 40880a708f8fSGustavo F. Padovan struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; 40890a708f8fSGustavo F. Padovan u16 scid, flags, result; 409048454079SGustavo F. Padovan struct l2cap_chan *chan; 4091cb3b3152SJohan Hedberg int len = cmd_len - sizeof(*rsp); 40923c588192SMat Martineau int err = 0; 40930a708f8fSGustavo F. Padovan 4094cb3b3152SJohan Hedberg if (cmd_len < sizeof(*rsp)) 4095cb3b3152SJohan Hedberg return -EPROTO; 4096cb3b3152SJohan Hedberg 40970a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 40980a708f8fSGustavo F. Padovan flags = __le16_to_cpu(rsp->flags); 40990a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 41000a708f8fSGustavo F. Padovan 410161386cbaSAndrei Emeltchenko BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, 410261386cbaSAndrei Emeltchenko result, len); 41030a708f8fSGustavo F. Padovan 4104baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, scid); 410548454079SGustavo F. Padovan if (!chan) 41060a708f8fSGustavo F. Padovan return 0; 41070a708f8fSGustavo F. Padovan 41080a708f8fSGustavo F. Padovan switch (result) { 41090a708f8fSGustavo F. Padovan case L2CAP_CONF_SUCCESS: 411047d1ec61SGustavo F. Padovan l2cap_conf_rfc_get(chan, rsp->data, len); 41110e8b207eSAndrei Emeltchenko clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41120a708f8fSGustavo F. Padovan break; 41130a708f8fSGustavo F. Padovan 41140e8b207eSAndrei Emeltchenko case L2CAP_CONF_PENDING: 41150e8b207eSAndrei Emeltchenko set_bit(CONF_REM_CONF_PEND, &chan->conf_state); 41160e8b207eSAndrei Emeltchenko 41170e8b207eSAndrei Emeltchenko if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { 41180e8b207eSAndrei Emeltchenko char buf[64]; 41190e8b207eSAndrei Emeltchenko 41200e8b207eSAndrei Emeltchenko len = l2cap_parse_conf_rsp(chan, rsp->data, len, 41210e8b207eSAndrei Emeltchenko buf, &result); 41220e8b207eSAndrei Emeltchenko if (len < 0) { 41235e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41240e8b207eSAndrei Emeltchenko goto done; 41250e8b207eSAndrei Emeltchenko } 41260e8b207eSAndrei Emeltchenko 4127f351bc72SAndrei Emeltchenko if (!chan->hs_hcon) { 412879de886dSAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 412979de886dSAndrei Emeltchenko 0); 41305ce66b59SAndrei Emeltchenko } else { 41315ce66b59SAndrei Emeltchenko if (l2cap_check_efs(chan)) { 41325ce66b59SAndrei Emeltchenko amp_create_logical_link(chan); 413379de886dSAndrei Emeltchenko chan->ident = cmd->ident; 41340e8b207eSAndrei Emeltchenko } 41355ce66b59SAndrei Emeltchenko } 41365ce66b59SAndrei Emeltchenko } 41370e8b207eSAndrei Emeltchenko goto done; 41380e8b207eSAndrei Emeltchenko 41390a708f8fSGustavo F. Padovan case L2CAP_CONF_UNACCEPT: 414073ffa904SGustavo F. Padovan if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { 41410a708f8fSGustavo F. Padovan char req[64]; 41420a708f8fSGustavo F. Padovan 41430a708f8fSGustavo F. Padovan if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { 41445e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41450a708f8fSGustavo F. Padovan goto done; 41460a708f8fSGustavo F. Padovan } 41470a708f8fSGustavo F. Padovan 41480a708f8fSGustavo F. Padovan /* throw out any old stored conf requests */ 41490a708f8fSGustavo F. Padovan result = L2CAP_CONF_SUCCESS; 4150b4450035SGustavo F. Padovan len = l2cap_parse_conf_rsp(chan, rsp->data, len, 4151b4450035SGustavo F. Padovan req, &result); 41520a708f8fSGustavo F. Padovan if (len < 0) { 41535e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41540a708f8fSGustavo F. Padovan goto done; 41550a708f8fSGustavo F. Padovan } 41560a708f8fSGustavo F. Padovan 41570a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, l2cap_get_ident(conn), 41580a708f8fSGustavo F. Padovan L2CAP_CONF_REQ, len, req); 415973ffa904SGustavo F. Padovan chan->num_conf_req++; 41600a708f8fSGustavo F. Padovan if (result != L2CAP_CONF_SUCCESS) 41610a708f8fSGustavo F. Padovan goto done; 41620a708f8fSGustavo F. Padovan break; 41630a708f8fSGustavo F. Padovan } 41640a708f8fSGustavo F. Padovan 41650a708f8fSGustavo F. Padovan default: 41666be36555SAndrei Emeltchenko l2cap_chan_set_err(chan, ECONNRESET); 41672e0052e4SAndrei Emeltchenko 4168ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); 41695e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 41700a708f8fSGustavo F. Padovan goto done; 41710a708f8fSGustavo F. Padovan } 41720a708f8fSGustavo F. Padovan 417359e54bd1SAndrei Emeltchenko if (flags & L2CAP_CONF_FLAG_CONTINUATION) 41740a708f8fSGustavo F. Padovan goto done; 41750a708f8fSGustavo F. Padovan 4176c1360a1cSGustavo F. Padovan set_bit(CONF_INPUT_DONE, &chan->conf_state); 41770a708f8fSGustavo F. Padovan 4178c1360a1cSGustavo F. Padovan if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { 417947d1ec61SGustavo F. Padovan set_default_fcs(chan); 41800a708f8fSGustavo F. Padovan 4181105bdf9eSMat Martineau if (chan->mode == L2CAP_MODE_ERTM || 4182105bdf9eSMat Martineau chan->mode == L2CAP_MODE_STREAMING) 41833c588192SMat Martineau err = l2cap_ertm_init(chan); 41840a708f8fSGustavo F. Padovan 41853c588192SMat Martineau if (err < 0) 41865e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 41873c588192SMat Martineau else 4188cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 41890a708f8fSGustavo F. Padovan } 41900a708f8fSGustavo F. Padovan 41910a708f8fSGustavo F. Padovan done: 41926be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 41933c588192SMat Martineau return err; 41940a708f8fSGustavo F. Padovan } 41950a708f8fSGustavo F. Padovan 41962d792818SGustavo Padovan static inline int l2cap_disconnect_req(struct l2cap_conn *conn, 4197cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4198cb3b3152SJohan Hedberg u8 *data) 41990a708f8fSGustavo F. Padovan { 42000a708f8fSGustavo F. Padovan struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; 42010a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp rsp; 42020a708f8fSGustavo F. Padovan u16 dcid, scid; 420348454079SGustavo F. Padovan struct l2cap_chan *chan; 42040a708f8fSGustavo F. Padovan struct sock *sk; 42050a708f8fSGustavo F. Padovan 4206cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4207cb3b3152SJohan Hedberg return -EPROTO; 4208cb3b3152SJohan Hedberg 42090a708f8fSGustavo F. Padovan scid = __le16_to_cpu(req->scid); 42100a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(req->dcid); 42110a708f8fSGustavo F. Padovan 42120a708f8fSGustavo F. Padovan BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); 42130a708f8fSGustavo F. Padovan 42143df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 42153df91ea2SAndrei Emeltchenko 42163df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, dcid); 42173df91ea2SAndrei Emeltchenko if (!chan) { 42183df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 4219c4ea249fSJohan Hedberg return -EBADSLT; 42203df91ea2SAndrei Emeltchenko } 42210a708f8fSGustavo F. Padovan 42226be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 42236be36555SAndrei Emeltchenko 422448454079SGustavo F. Padovan sk = chan->sk; 422548454079SGustavo F. Padovan 4226fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 4227fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 42280a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); 42290a708f8fSGustavo F. Padovan 42306be36555SAndrei Emeltchenko lock_sock(sk); 42310a708f8fSGustavo F. Padovan sk->sk_shutdown = SHUTDOWN_MASK; 42326be36555SAndrei Emeltchenko release_sock(sk); 42330a708f8fSGustavo F. Padovan 423461d6ef3eSMat Martineau l2cap_chan_hold(chan); 423548454079SGustavo F. Padovan l2cap_chan_del(chan, ECONNRESET); 42366be36555SAndrei Emeltchenko 42376be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 42380a708f8fSGustavo F. Padovan 423980b98027SGustavo Padovan chan->ops->close(chan); 424061d6ef3eSMat Martineau l2cap_chan_put(chan); 42413df91ea2SAndrei Emeltchenko 42423df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 42433df91ea2SAndrei Emeltchenko 42440a708f8fSGustavo F. Padovan return 0; 42450a708f8fSGustavo F. Padovan } 42460a708f8fSGustavo F. Padovan 42472d792818SGustavo Padovan static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, 4248cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4249cb3b3152SJohan Hedberg u8 *data) 42500a708f8fSGustavo F. Padovan { 42510a708f8fSGustavo F. Padovan struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; 42520a708f8fSGustavo F. Padovan u16 dcid, scid; 425348454079SGustavo F. Padovan struct l2cap_chan *chan; 42540a708f8fSGustavo F. Padovan 4255cb3b3152SJohan Hedberg if (cmd_len != sizeof(*rsp)) 4256cb3b3152SJohan Hedberg return -EPROTO; 4257cb3b3152SJohan Hedberg 42580a708f8fSGustavo F. Padovan scid = __le16_to_cpu(rsp->scid); 42590a708f8fSGustavo F. Padovan dcid = __le16_to_cpu(rsp->dcid); 42600a708f8fSGustavo F. Padovan 42610a708f8fSGustavo F. Padovan BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); 42620a708f8fSGustavo F. Padovan 42633df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 42643df91ea2SAndrei Emeltchenko 42653df91ea2SAndrei Emeltchenko chan = __l2cap_get_chan_by_scid(conn, scid); 42663df91ea2SAndrei Emeltchenko if (!chan) { 42673df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 42680a708f8fSGustavo F. Padovan return 0; 42693df91ea2SAndrei Emeltchenko } 42700a708f8fSGustavo F. Padovan 42716be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 427248454079SGustavo F. Padovan 427361d6ef3eSMat Martineau l2cap_chan_hold(chan); 427448454079SGustavo F. Padovan l2cap_chan_del(chan, 0); 42756be36555SAndrei Emeltchenko 42766be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 42770a708f8fSGustavo F. Padovan 427880b98027SGustavo Padovan chan->ops->close(chan); 427961d6ef3eSMat Martineau l2cap_chan_put(chan); 42803df91ea2SAndrei Emeltchenko 42813df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 42823df91ea2SAndrei Emeltchenko 42830a708f8fSGustavo F. Padovan return 0; 42840a708f8fSGustavo F. Padovan } 42850a708f8fSGustavo F. Padovan 42862d792818SGustavo Padovan static inline int l2cap_information_req(struct l2cap_conn *conn, 4287cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4288cb3b3152SJohan Hedberg u8 *data) 42890a708f8fSGustavo F. Padovan { 42900a708f8fSGustavo F. Padovan struct l2cap_info_req *req = (struct l2cap_info_req *) data; 42910a708f8fSGustavo F. Padovan u16 type; 42920a708f8fSGustavo F. Padovan 4293cb3b3152SJohan Hedberg if (cmd_len != sizeof(*req)) 4294cb3b3152SJohan Hedberg return -EPROTO; 4295cb3b3152SJohan Hedberg 42960a708f8fSGustavo F. Padovan type = __le16_to_cpu(req->type); 42970a708f8fSGustavo F. Padovan 42980a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x", type); 42990a708f8fSGustavo F. Padovan 43000a708f8fSGustavo F. Padovan if (type == L2CAP_IT_FEAT_MASK) { 43010a708f8fSGustavo F. Padovan u8 buf[8]; 43020a708f8fSGustavo F. Padovan u32 feat_mask = l2cap_feat_mask; 43030a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 4304ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); 4305ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 43060a708f8fSGustavo F. Padovan if (!disable_ertm) 43070a708f8fSGustavo F. Padovan feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING 43080a708f8fSGustavo F. Padovan | L2CAP_FEAT_FCS; 4309848566b3SMarcel Holtmann if (conn->hs_enabled) 43106327eb98SAndrei Emeltchenko feat_mask |= L2CAP_FEAT_EXT_FLOW 43116327eb98SAndrei Emeltchenko | L2CAP_FEAT_EXT_WINDOW; 4312a5fd6f30SAndrei Emeltchenko 43130a708f8fSGustavo F. Padovan put_unaligned_le32(feat_mask, rsp->data); 43142d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43152d792818SGustavo Padovan buf); 43160a708f8fSGustavo F. Padovan } else if (type == L2CAP_IT_FIXED_CHAN) { 43170a708f8fSGustavo F. Padovan u8 buf[12]; 43180a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; 431950a147cdSMat Martineau 4320848566b3SMarcel Holtmann if (conn->hs_enabled) 432150a147cdSMat Martineau l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; 432250a147cdSMat Martineau else 432350a147cdSMat Martineau l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; 432450a147cdSMat Martineau 4325ac73498cSAndrei Emeltchenko rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 4326ac73498cSAndrei Emeltchenko rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); 4327c6337ea6SAndrei Emeltchenko memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); 43282d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), 43292d792818SGustavo Padovan buf); 43300a708f8fSGustavo F. Padovan } else { 43310a708f8fSGustavo F. Padovan struct l2cap_info_rsp rsp; 43320a708f8fSGustavo F. Padovan rsp.type = cpu_to_le16(type); 4333ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); 43342d792818SGustavo Padovan l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), 43352d792818SGustavo Padovan &rsp); 43360a708f8fSGustavo F. Padovan } 43370a708f8fSGustavo F. Padovan 43380a708f8fSGustavo F. Padovan return 0; 43390a708f8fSGustavo F. Padovan } 43400a708f8fSGustavo F. Padovan 43412d792818SGustavo Padovan static inline int l2cap_information_rsp(struct l2cap_conn *conn, 4342cb3b3152SJohan Hedberg struct l2cap_cmd_hdr *cmd, u16 cmd_len, 4343cb3b3152SJohan Hedberg u8 *data) 43440a708f8fSGustavo F. Padovan { 43450a708f8fSGustavo F. Padovan struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; 43460a708f8fSGustavo F. Padovan u16 type, result; 43470a708f8fSGustavo F. Padovan 43483f6fa3d4SJaganath Kanakkassery if (cmd_len < sizeof(*rsp)) 4349cb3b3152SJohan Hedberg return -EPROTO; 4350cb3b3152SJohan Hedberg 43510a708f8fSGustavo F. Padovan type = __le16_to_cpu(rsp->type); 43520a708f8fSGustavo F. Padovan result = __le16_to_cpu(rsp->result); 43530a708f8fSGustavo F. Padovan 43540a708f8fSGustavo F. Padovan BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); 43550a708f8fSGustavo F. Padovan 4356e90165beSAndrei Emeltchenko /* L2CAP Info req/rsp are unbound to channels, add extra checks */ 4357e90165beSAndrei Emeltchenko if (cmd->ident != conn->info_ident || 4358e90165beSAndrei Emeltchenko conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) 4359e90165beSAndrei Emeltchenko return 0; 4360e90165beSAndrei Emeltchenko 436117cd3f37SUlisses Furquim cancel_delayed_work(&conn->info_timer); 43620a708f8fSGustavo F. Padovan 43630a708f8fSGustavo F. Padovan if (result != L2CAP_IR_SUCCESS) { 43640a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 43650a708f8fSGustavo F. Padovan conn->info_ident = 0; 43660a708f8fSGustavo F. Padovan 43670a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 43680a708f8fSGustavo F. Padovan 43690a708f8fSGustavo F. Padovan return 0; 43700a708f8fSGustavo F. Padovan } 43710a708f8fSGustavo F. Padovan 4372978c93b9SAndrei Emeltchenko switch (type) { 4373978c93b9SAndrei Emeltchenko case L2CAP_IT_FEAT_MASK: 43740a708f8fSGustavo F. Padovan conn->feat_mask = get_unaligned_le32(rsp->data); 43750a708f8fSGustavo F. Padovan 43760a708f8fSGustavo F. Padovan if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { 43770a708f8fSGustavo F. Padovan struct l2cap_info_req req; 4378ac73498cSAndrei Emeltchenko req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); 43790a708f8fSGustavo F. Padovan 43800a708f8fSGustavo F. Padovan conn->info_ident = l2cap_get_ident(conn); 43810a708f8fSGustavo F. Padovan 43820a708f8fSGustavo F. Padovan l2cap_send_cmd(conn, conn->info_ident, 43830a708f8fSGustavo F. Padovan L2CAP_INFO_REQ, sizeof(req), &req); 43840a708f8fSGustavo F. Padovan } else { 43850a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 43860a708f8fSGustavo F. Padovan conn->info_ident = 0; 43870a708f8fSGustavo F. Padovan 43880a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 43890a708f8fSGustavo F. Padovan } 4390978c93b9SAndrei Emeltchenko break; 4391978c93b9SAndrei Emeltchenko 4392978c93b9SAndrei Emeltchenko case L2CAP_IT_FIXED_CHAN: 4393978c93b9SAndrei Emeltchenko conn->fixed_chan_mask = rsp->data[0]; 43940a708f8fSGustavo F. Padovan conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; 43950a708f8fSGustavo F. Padovan conn->info_ident = 0; 43960a708f8fSGustavo F. Padovan 43970a708f8fSGustavo F. Padovan l2cap_conn_start(conn); 4398978c93b9SAndrei Emeltchenko break; 43990a708f8fSGustavo F. Padovan } 44000a708f8fSGustavo F. Padovan 44010a708f8fSGustavo F. Padovan return 0; 44020a708f8fSGustavo F. Padovan } 44030a708f8fSGustavo F. Padovan 44041700915fSMat Martineau static int l2cap_create_channel_req(struct l2cap_conn *conn, 44052d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 44062d792818SGustavo Padovan u16 cmd_len, void *data) 4407f94ff6ffSMat Martineau { 4408f94ff6ffSMat Martineau struct l2cap_create_chan_req *req = data; 44096e1df6a6SAndrei Emeltchenko struct l2cap_create_chan_rsp rsp; 44101700915fSMat Martineau struct l2cap_chan *chan; 44116e1df6a6SAndrei Emeltchenko struct hci_dev *hdev; 4412f94ff6ffSMat Martineau u16 psm, scid; 4413f94ff6ffSMat Martineau 4414f94ff6ffSMat Martineau if (cmd_len != sizeof(*req)) 4415f94ff6ffSMat Martineau return -EPROTO; 4416f94ff6ffSMat Martineau 4417848566b3SMarcel Holtmann if (!conn->hs_enabled) 4418f94ff6ffSMat Martineau return -EINVAL; 4419f94ff6ffSMat Martineau 4420f94ff6ffSMat Martineau psm = le16_to_cpu(req->psm); 4421f94ff6ffSMat Martineau scid = le16_to_cpu(req->scid); 4422f94ff6ffSMat Martineau 4423ad0ac6caSAndrei Emeltchenko BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); 4424f94ff6ffSMat Martineau 44256e1df6a6SAndrei Emeltchenko /* For controller id 0 make BR/EDR connection */ 44266e1df6a6SAndrei Emeltchenko if (req->amp_id == HCI_BREDR_ID) { 44276e1df6a6SAndrei Emeltchenko l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 44286e1df6a6SAndrei Emeltchenko req->amp_id); 44296e1df6a6SAndrei Emeltchenko return 0; 44306e1df6a6SAndrei Emeltchenko } 44311700915fSMat Martineau 44321700915fSMat Martineau /* Validate AMP controller id */ 44331700915fSMat Martineau hdev = hci_dev_get(req->amp_id); 44346e1df6a6SAndrei Emeltchenko if (!hdev) 44356e1df6a6SAndrei Emeltchenko goto error; 44361700915fSMat Martineau 44376e1df6a6SAndrei Emeltchenko if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { 44386e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 44396e1df6a6SAndrei Emeltchenko goto error; 44406e1df6a6SAndrei Emeltchenko } 44416e1df6a6SAndrei Emeltchenko 44426e1df6a6SAndrei Emeltchenko chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, 44436e1df6a6SAndrei Emeltchenko req->amp_id); 44446e1df6a6SAndrei Emeltchenko if (chan) { 44456e1df6a6SAndrei Emeltchenko struct amp_mgr *mgr = conn->hcon->amp_mgr; 44466e1df6a6SAndrei Emeltchenko struct hci_conn *hs_hcon; 44476e1df6a6SAndrei Emeltchenko 44486e1df6a6SAndrei Emeltchenko hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst); 44496e1df6a6SAndrei Emeltchenko if (!hs_hcon) { 44506e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 445121870b52SJohan Hedberg return -EBADSLT; 44526e1df6a6SAndrei Emeltchenko } 44536e1df6a6SAndrei Emeltchenko 44546e1df6a6SAndrei Emeltchenko BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); 44556e1df6a6SAndrei Emeltchenko 44566e1df6a6SAndrei Emeltchenko mgr->bredr_chan = chan; 44576e1df6a6SAndrei Emeltchenko chan->hs_hcon = hs_hcon; 4458fd45bf4cSAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 44596e1df6a6SAndrei Emeltchenko conn->mtu = hdev->block_mtu; 44606e1df6a6SAndrei Emeltchenko } 44616e1df6a6SAndrei Emeltchenko 44626e1df6a6SAndrei Emeltchenko hci_dev_put(hdev); 44636e1df6a6SAndrei Emeltchenko 44646e1df6a6SAndrei Emeltchenko return 0; 44656e1df6a6SAndrei Emeltchenko 44666e1df6a6SAndrei Emeltchenko error: 4467f94ff6ffSMat Martineau rsp.dcid = 0; 4468f94ff6ffSMat Martineau rsp.scid = cpu_to_le16(scid); 44691700915fSMat Martineau rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); 44708ce0c498SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 4471f94ff6ffSMat Martineau 4472f94ff6ffSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, 4473f94ff6ffSMat Martineau sizeof(rsp), &rsp); 4474f94ff6ffSMat Martineau 4475dc280801SJohan Hedberg return 0; 4476f94ff6ffSMat Martineau } 4477f94ff6ffSMat Martineau 44788eb200bdSMat Martineau static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) 44798eb200bdSMat Martineau { 44808eb200bdSMat Martineau struct l2cap_move_chan_req req; 44818eb200bdSMat Martineau u8 ident; 44828eb200bdSMat Martineau 44838eb200bdSMat Martineau BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); 44848eb200bdSMat Martineau 44858eb200bdSMat Martineau ident = l2cap_get_ident(chan->conn); 44868eb200bdSMat Martineau chan->ident = ident; 44878eb200bdSMat Martineau 44888eb200bdSMat Martineau req.icid = cpu_to_le16(chan->scid); 44898eb200bdSMat Martineau req.dest_amp_id = dest_amp_id; 44908eb200bdSMat Martineau 44918eb200bdSMat Martineau l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), 44928eb200bdSMat Martineau &req); 44938eb200bdSMat Martineau 44948eb200bdSMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 44958eb200bdSMat Martineau } 44968eb200bdSMat Martineau 44971500109bSMat Martineau static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) 44988d5a04a1SMat Martineau { 44998d5a04a1SMat Martineau struct l2cap_move_chan_rsp rsp; 45008d5a04a1SMat Martineau 45011500109bSMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45028d5a04a1SMat Martineau 45031500109bSMat Martineau rsp.icid = cpu_to_le16(chan->dcid); 45048d5a04a1SMat Martineau rsp.result = cpu_to_le16(result); 45058d5a04a1SMat Martineau 45061500109bSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, 45071500109bSMat Martineau sizeof(rsp), &rsp); 45088d5a04a1SMat Martineau } 45098d5a04a1SMat Martineau 45105b155ef9SMat Martineau static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) 45118d5a04a1SMat Martineau { 45128d5a04a1SMat Martineau struct l2cap_move_chan_cfm cfm; 45138d5a04a1SMat Martineau 45145b155ef9SMat Martineau BT_DBG("chan %p, result 0x%4.4x", chan, result); 45158d5a04a1SMat Martineau 45165b155ef9SMat Martineau chan->ident = l2cap_get_ident(chan->conn); 45178d5a04a1SMat Martineau 45185b155ef9SMat Martineau cfm.icid = cpu_to_le16(chan->scid); 45198d5a04a1SMat Martineau cfm.result = cpu_to_le16(result); 45208d5a04a1SMat Martineau 45215b155ef9SMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, 45225b155ef9SMat Martineau sizeof(cfm), &cfm); 45235b155ef9SMat Martineau 45245b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); 45255b155ef9SMat Martineau } 45265b155ef9SMat Martineau 45275b155ef9SMat Martineau static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) 45285b155ef9SMat Martineau { 45295b155ef9SMat Martineau struct l2cap_move_chan_cfm cfm; 45305b155ef9SMat Martineau 45315b155ef9SMat Martineau BT_DBG("conn %p, icid 0x%4.4x", conn, icid); 45325b155ef9SMat Martineau 45335b155ef9SMat Martineau cfm.icid = cpu_to_le16(icid); 45345b155ef9SMat Martineau cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); 45355b155ef9SMat Martineau 45365b155ef9SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, 45375b155ef9SMat Martineau sizeof(cfm), &cfm); 45388d5a04a1SMat Martineau } 45398d5a04a1SMat Martineau 45408d5a04a1SMat Martineau static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, 45418d5a04a1SMat Martineau u16 icid) 45428d5a04a1SMat Martineau { 45438d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp rsp; 45448d5a04a1SMat Martineau 4545ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 45468d5a04a1SMat Martineau 45478d5a04a1SMat Martineau rsp.icid = cpu_to_le16(icid); 45488d5a04a1SMat Martineau l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); 45498d5a04a1SMat Martineau } 45508d5a04a1SMat Martineau 45515f3847a4SMat Martineau static void __release_logical_link(struct l2cap_chan *chan) 45525f3847a4SMat Martineau { 45535f3847a4SMat Martineau chan->hs_hchan = NULL; 45545f3847a4SMat Martineau chan->hs_hcon = NULL; 45555f3847a4SMat Martineau 45565f3847a4SMat Martineau /* Placeholder - release the logical link */ 45575f3847a4SMat Martineau } 45585f3847a4SMat Martineau 45591500109bSMat Martineau static void l2cap_logical_fail(struct l2cap_chan *chan) 45601500109bSMat Martineau { 45611500109bSMat Martineau /* Logical link setup failed */ 45621500109bSMat Martineau if (chan->state != BT_CONNECTED) { 45631500109bSMat Martineau /* Create channel failure, disconnect */ 45645e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 45651500109bSMat Martineau return; 45661500109bSMat Martineau } 45671500109bSMat Martineau 45681500109bSMat Martineau switch (chan->move_role) { 45691500109bSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 45701500109bSMat Martineau l2cap_move_done(chan); 45711500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); 45721500109bSMat Martineau break; 45731500109bSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 45741500109bSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || 45751500109bSMat Martineau chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { 45761500109bSMat Martineau /* Remote has only sent pending or 45771500109bSMat Martineau * success responses, clean up 45781500109bSMat Martineau */ 45791500109bSMat Martineau l2cap_move_done(chan); 45801500109bSMat Martineau } 45811500109bSMat Martineau 45821500109bSMat Martineau /* Other amp move states imply that the move 45831500109bSMat Martineau * has already aborted 45841500109bSMat Martineau */ 45851500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 45861500109bSMat Martineau break; 45871500109bSMat Martineau } 45881500109bSMat Martineau } 45891500109bSMat Martineau 45901500109bSMat Martineau static void l2cap_logical_finish_create(struct l2cap_chan *chan, 45911500109bSMat Martineau struct hci_chan *hchan) 45921500109bSMat Martineau { 45931500109bSMat Martineau struct l2cap_conf_rsp rsp; 45941500109bSMat Martineau 4595336178a3SAndrei Emeltchenko chan->hs_hchan = hchan; 45961500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 45971500109bSMat Martineau 459835ba9561SAndrei Emeltchenko l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); 45991500109bSMat Martineau 46001500109bSMat Martineau if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { 4601fe79c6feSAndrei Emeltchenko int err; 46021500109bSMat Martineau 46031500109bSMat Martineau set_default_fcs(chan); 46041500109bSMat Martineau 46051500109bSMat Martineau err = l2cap_ertm_init(chan); 46061500109bSMat Martineau if (err < 0) 46075e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, -err); 46081500109bSMat Martineau else 46091500109bSMat Martineau l2cap_chan_ready(chan); 46101500109bSMat Martineau } 46111500109bSMat Martineau } 46121500109bSMat Martineau 46131500109bSMat Martineau static void l2cap_logical_finish_move(struct l2cap_chan *chan, 46141500109bSMat Martineau struct hci_chan *hchan) 46151500109bSMat Martineau { 46161500109bSMat Martineau chan->hs_hcon = hchan->conn; 46171500109bSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 46181500109bSMat Martineau 46191500109bSMat Martineau BT_DBG("move_state %d", chan->move_state); 46201500109bSMat Martineau 46211500109bSMat Martineau switch (chan->move_state) { 46221500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 46231500109bSMat Martineau /* Move confirm will be sent after a success 46241500109bSMat Martineau * response is received 46251500109bSMat Martineau */ 46261500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 46271500109bSMat Martineau break; 46281500109bSMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_CFM: 46291500109bSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 46301500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 46311500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 46321500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 46331500109bSMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 46341500109bSMat Martineau } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 46351500109bSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 46361500109bSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 46371500109bSMat Martineau } 46381500109bSMat Martineau break; 46391500109bSMat Martineau default: 46401500109bSMat Martineau /* Move was not in expected state, free the channel */ 46411500109bSMat Martineau __release_logical_link(chan); 46421500109bSMat Martineau 46431500109bSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 46441500109bSMat Martineau } 46451500109bSMat Martineau } 46461500109bSMat Martineau 46471500109bSMat Martineau /* Call with chan locked */ 464827695fb4SAndrei Emeltchenko void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, 46495b155ef9SMat Martineau u8 status) 46505b155ef9SMat Martineau { 46511500109bSMat Martineau BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); 46521500109bSMat Martineau 46531500109bSMat Martineau if (status) { 46541500109bSMat Martineau l2cap_logical_fail(chan); 46551500109bSMat Martineau __release_logical_link(chan); 46565b155ef9SMat Martineau return; 46575b155ef9SMat Martineau } 46585b155ef9SMat Martineau 46591500109bSMat Martineau if (chan->state != BT_CONNECTED) { 46601500109bSMat Martineau /* Ignore logical link if channel is on BR/EDR */ 46611500109bSMat Martineau if (chan->local_amp_id) 46621500109bSMat Martineau l2cap_logical_finish_create(chan, hchan); 46631500109bSMat Martineau } else { 46641500109bSMat Martineau l2cap_logical_finish_move(chan, hchan); 46651500109bSMat Martineau } 46661500109bSMat Martineau } 46671500109bSMat Martineau 46683f7a56c4SMat Martineau void l2cap_move_start(struct l2cap_chan *chan) 46693f7a56c4SMat Martineau { 46703f7a56c4SMat Martineau BT_DBG("chan %p", chan); 46713f7a56c4SMat Martineau 46723f7a56c4SMat Martineau if (chan->local_amp_id == HCI_BREDR_ID) { 46733f7a56c4SMat Martineau if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) 46743f7a56c4SMat Martineau return; 46753f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 46763f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 46773f7a56c4SMat Martineau /* Placeholder - start physical link setup */ 46783f7a56c4SMat Martineau } else { 46793f7a56c4SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; 46803f7a56c4SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 46813f7a56c4SMat Martineau chan->move_id = 0; 46823f7a56c4SMat Martineau l2cap_move_setup(chan); 46833f7a56c4SMat Martineau l2cap_send_move_chan_req(chan, 0); 46843f7a56c4SMat Martineau } 46853f7a56c4SMat Martineau } 46863f7a56c4SMat Martineau 46878eb200bdSMat Martineau static void l2cap_do_create(struct l2cap_chan *chan, int result, 46888eb200bdSMat Martineau u8 local_amp_id, u8 remote_amp_id) 46898eb200bdSMat Martineau { 469062748ca1SAndrei Emeltchenko BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), 469162748ca1SAndrei Emeltchenko local_amp_id, remote_amp_id); 469262748ca1SAndrei Emeltchenko 469312d6cc60SAndrei Emeltchenko chan->fcs = L2CAP_FCS_NONE; 469412d6cc60SAndrei Emeltchenko 469562748ca1SAndrei Emeltchenko /* Outgoing channel on AMP */ 469662748ca1SAndrei Emeltchenko if (chan->state == BT_CONNECT) { 469762748ca1SAndrei Emeltchenko if (result == L2CAP_CR_SUCCESS) { 469862748ca1SAndrei Emeltchenko chan->local_amp_id = local_amp_id; 469962748ca1SAndrei Emeltchenko l2cap_send_create_chan_req(chan, remote_amp_id); 470062748ca1SAndrei Emeltchenko } else { 470162748ca1SAndrei Emeltchenko /* Revert to BR/EDR connect */ 470262748ca1SAndrei Emeltchenko l2cap_send_conn_req(chan); 470362748ca1SAndrei Emeltchenko } 470462748ca1SAndrei Emeltchenko 470562748ca1SAndrei Emeltchenko return; 470662748ca1SAndrei Emeltchenko } 470762748ca1SAndrei Emeltchenko 470862748ca1SAndrei Emeltchenko /* Incoming channel on AMP */ 470962748ca1SAndrei Emeltchenko if (__l2cap_no_conn_pending(chan)) { 47108eb200bdSMat Martineau struct l2cap_conn_rsp rsp; 47118eb200bdSMat Martineau char buf[128]; 47128eb200bdSMat Martineau rsp.scid = cpu_to_le16(chan->dcid); 47138eb200bdSMat Martineau rsp.dcid = cpu_to_le16(chan->scid); 47148eb200bdSMat Martineau 47158eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 47168eb200bdSMat Martineau /* Send successful response */ 471762cd50e2SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); 471862cd50e2SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 47198eb200bdSMat Martineau } else { 47208eb200bdSMat Martineau /* Send negative response */ 472162cd50e2SAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); 472262cd50e2SAndrei Emeltchenko rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); 47238eb200bdSMat Martineau } 47248eb200bdSMat Martineau 47258eb200bdSMat Martineau l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, 47268eb200bdSMat Martineau sizeof(rsp), &rsp); 47278eb200bdSMat Martineau 47288eb200bdSMat Martineau if (result == L2CAP_CR_SUCCESS) { 47298eb200bdSMat Martineau __l2cap_state_change(chan, BT_CONFIG); 47308eb200bdSMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 47318eb200bdSMat Martineau l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), 47328eb200bdSMat Martineau L2CAP_CONF_REQ, 47338eb200bdSMat Martineau l2cap_build_conf_req(chan, buf), buf); 47348eb200bdSMat Martineau chan->num_conf_req++; 47358eb200bdSMat Martineau } 47368eb200bdSMat Martineau } 47378eb200bdSMat Martineau } 47388eb200bdSMat Martineau 47398eb200bdSMat Martineau static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, 47408eb200bdSMat Martineau u8 remote_amp_id) 47418eb200bdSMat Martineau { 47428eb200bdSMat Martineau l2cap_move_setup(chan); 47438eb200bdSMat Martineau chan->move_id = local_amp_id; 47448eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP; 47458eb200bdSMat Martineau 47468eb200bdSMat Martineau l2cap_send_move_chan_req(chan, remote_amp_id); 47478eb200bdSMat Martineau } 47488eb200bdSMat Martineau 47498eb200bdSMat Martineau static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) 47508eb200bdSMat Martineau { 47518eb200bdSMat Martineau struct hci_chan *hchan = NULL; 47528eb200bdSMat Martineau 47538eb200bdSMat Martineau /* Placeholder - get hci_chan for logical link */ 47548eb200bdSMat Martineau 47558eb200bdSMat Martineau if (hchan) { 47568eb200bdSMat Martineau if (hchan->state == BT_CONNECTED) { 47578eb200bdSMat Martineau /* Logical link is ready to go */ 47588eb200bdSMat Martineau chan->hs_hcon = hchan->conn; 47598eb200bdSMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 47608eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 47618eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); 47628eb200bdSMat Martineau 47638eb200bdSMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 47648eb200bdSMat Martineau } else { 47658eb200bdSMat Martineau /* Wait for logical link to be ready */ 47668eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 47678eb200bdSMat Martineau } 47688eb200bdSMat Martineau } else { 47698eb200bdSMat Martineau /* Logical link not available */ 47708eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); 47718eb200bdSMat Martineau } 47728eb200bdSMat Martineau } 47738eb200bdSMat Martineau 47748eb200bdSMat Martineau static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) 47758eb200bdSMat Martineau { 47768eb200bdSMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { 47778eb200bdSMat Martineau u8 rsp_result; 47788eb200bdSMat Martineau if (result == -EINVAL) 47798eb200bdSMat Martineau rsp_result = L2CAP_MR_BAD_ID; 47808eb200bdSMat Martineau else 47818eb200bdSMat Martineau rsp_result = L2CAP_MR_NOT_ALLOWED; 47828eb200bdSMat Martineau 47838eb200bdSMat Martineau l2cap_send_move_chan_rsp(chan, rsp_result); 47848eb200bdSMat Martineau } 47858eb200bdSMat Martineau 47868eb200bdSMat Martineau chan->move_role = L2CAP_MOVE_ROLE_NONE; 47878eb200bdSMat Martineau chan->move_state = L2CAP_MOVE_STABLE; 47888eb200bdSMat Martineau 47898eb200bdSMat Martineau /* Restart data transmission */ 47908eb200bdSMat Martineau l2cap_ertm_send(chan); 47918eb200bdSMat Martineau } 47928eb200bdSMat Martineau 4793a514b17fSAndrei Emeltchenko /* Invoke with locked chan */ 4794a514b17fSAndrei Emeltchenko void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) 47958eb200bdSMat Martineau { 4796770bfefaSAndrei Emeltchenko u8 local_amp_id = chan->local_amp_id; 4797fffadc08SAndrei Emeltchenko u8 remote_amp_id = chan->remote_amp_id; 4798770bfefaSAndrei Emeltchenko 47998eb200bdSMat Martineau BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", 48008eb200bdSMat Martineau chan, result, local_amp_id, remote_amp_id); 48018eb200bdSMat Martineau 48028eb200bdSMat Martineau if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { 48038eb200bdSMat Martineau l2cap_chan_unlock(chan); 48048eb200bdSMat Martineau return; 48058eb200bdSMat Martineau } 48068eb200bdSMat Martineau 48078eb200bdSMat Martineau if (chan->state != BT_CONNECTED) { 48088eb200bdSMat Martineau l2cap_do_create(chan, result, local_amp_id, remote_amp_id); 48098eb200bdSMat Martineau } else if (result != L2CAP_MR_SUCCESS) { 48108eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48118eb200bdSMat Martineau } else { 48128eb200bdSMat Martineau switch (chan->move_role) { 48138eb200bdSMat Martineau case L2CAP_MOVE_ROLE_INITIATOR: 48148eb200bdSMat Martineau l2cap_do_move_initiate(chan, local_amp_id, 48158eb200bdSMat Martineau remote_amp_id); 48168eb200bdSMat Martineau break; 48178eb200bdSMat Martineau case L2CAP_MOVE_ROLE_RESPONDER: 48188eb200bdSMat Martineau l2cap_do_move_respond(chan, result); 48198eb200bdSMat Martineau break; 48208eb200bdSMat Martineau default: 48218eb200bdSMat Martineau l2cap_do_move_cancel(chan, result); 48228eb200bdSMat Martineau break; 48238eb200bdSMat Martineau } 48248eb200bdSMat Martineau } 48258eb200bdSMat Martineau } 48268eb200bdSMat Martineau 48278d5a04a1SMat Martineau static inline int l2cap_move_channel_req(struct l2cap_conn *conn, 4828ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 4829ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 48308d5a04a1SMat Martineau { 48318d5a04a1SMat Martineau struct l2cap_move_chan_req *req = data; 48321500109bSMat Martineau struct l2cap_move_chan_rsp rsp; 483302b0fbb9SMat Martineau struct l2cap_chan *chan; 48348d5a04a1SMat Martineau u16 icid = 0; 48358d5a04a1SMat Martineau u16 result = L2CAP_MR_NOT_ALLOWED; 48368d5a04a1SMat Martineau 48378d5a04a1SMat Martineau if (cmd_len != sizeof(*req)) 48388d5a04a1SMat Martineau return -EPROTO; 48398d5a04a1SMat Martineau 48408d5a04a1SMat Martineau icid = le16_to_cpu(req->icid); 48418d5a04a1SMat Martineau 4842ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); 48438d5a04a1SMat Martineau 4844848566b3SMarcel Holtmann if (!conn->hs_enabled) 48458d5a04a1SMat Martineau return -EINVAL; 48468d5a04a1SMat Martineau 484702b0fbb9SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 484802b0fbb9SMat Martineau if (!chan) { 48491500109bSMat Martineau rsp.icid = cpu_to_le16(icid); 48501500109bSMat Martineau rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); 48511500109bSMat Martineau l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, 48521500109bSMat Martineau sizeof(rsp), &rsp); 485302b0fbb9SMat Martineau return 0; 485402b0fbb9SMat Martineau } 485502b0fbb9SMat Martineau 48561500109bSMat Martineau chan->ident = cmd->ident; 48571500109bSMat Martineau 485802b0fbb9SMat Martineau if (chan->scid < L2CAP_CID_DYN_START || 485902b0fbb9SMat Martineau chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || 486002b0fbb9SMat Martineau (chan->mode != L2CAP_MODE_ERTM && 486102b0fbb9SMat Martineau chan->mode != L2CAP_MODE_STREAMING)) { 486202b0fbb9SMat Martineau result = L2CAP_MR_NOT_ALLOWED; 486302b0fbb9SMat Martineau goto send_move_response; 486402b0fbb9SMat Martineau } 486502b0fbb9SMat Martineau 486602b0fbb9SMat Martineau if (chan->local_amp_id == req->dest_amp_id) { 486702b0fbb9SMat Martineau result = L2CAP_MR_SAME_ID; 486802b0fbb9SMat Martineau goto send_move_response; 486902b0fbb9SMat Martineau } 487002b0fbb9SMat Martineau 487102b0fbb9SMat Martineau if (req->dest_amp_id) { 487202b0fbb9SMat Martineau struct hci_dev *hdev; 487302b0fbb9SMat Martineau hdev = hci_dev_get(req->dest_amp_id); 487402b0fbb9SMat Martineau if (!hdev || hdev->dev_type != HCI_AMP || 487502b0fbb9SMat Martineau !test_bit(HCI_UP, &hdev->flags)) { 487602b0fbb9SMat Martineau if (hdev) 487702b0fbb9SMat Martineau hci_dev_put(hdev); 487802b0fbb9SMat Martineau 487902b0fbb9SMat Martineau result = L2CAP_MR_BAD_ID; 488002b0fbb9SMat Martineau goto send_move_response; 488102b0fbb9SMat Martineau } 488202b0fbb9SMat Martineau hci_dev_put(hdev); 488302b0fbb9SMat Martineau } 488402b0fbb9SMat Martineau 488502b0fbb9SMat Martineau /* Detect a move collision. Only send a collision response 488602b0fbb9SMat Martineau * if this side has "lost", otherwise proceed with the move. 488702b0fbb9SMat Martineau * The winner has the larger bd_addr. 488802b0fbb9SMat Martineau */ 488902b0fbb9SMat Martineau if ((__chan_is_moving(chan) || 489002b0fbb9SMat Martineau chan->move_role != L2CAP_MOVE_ROLE_NONE) && 489102b0fbb9SMat Martineau bacmp(conn->src, conn->dst) > 0) { 489202b0fbb9SMat Martineau result = L2CAP_MR_COLLISION; 489302b0fbb9SMat Martineau goto send_move_response; 489402b0fbb9SMat Martineau } 489502b0fbb9SMat Martineau 489602b0fbb9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 489702b0fbb9SMat Martineau l2cap_move_setup(chan); 489802b0fbb9SMat Martineau chan->move_id = req->dest_amp_id; 489902b0fbb9SMat Martineau icid = chan->dcid; 490002b0fbb9SMat Martineau 490102b0fbb9SMat Martineau if (!req->dest_amp_id) { 490202b0fbb9SMat Martineau /* Moving to BR/EDR */ 490302b0fbb9SMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 490402b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 490502b0fbb9SMat Martineau result = L2CAP_MR_PEND; 490602b0fbb9SMat Martineau } else { 490702b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; 490802b0fbb9SMat Martineau result = L2CAP_MR_SUCCESS; 490902b0fbb9SMat Martineau } 491002b0fbb9SMat Martineau } else { 491102b0fbb9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_PREPARE; 491202b0fbb9SMat Martineau /* Placeholder - uncomment when amp functions are available */ 491302b0fbb9SMat Martineau /*amp_accept_physical(chan, req->dest_amp_id);*/ 491402b0fbb9SMat Martineau result = L2CAP_MR_PEND; 491502b0fbb9SMat Martineau } 491602b0fbb9SMat Martineau 491702b0fbb9SMat Martineau send_move_response: 49181500109bSMat Martineau l2cap_send_move_chan_rsp(chan, result); 49198d5a04a1SMat Martineau 492002b0fbb9SMat Martineau l2cap_chan_unlock(chan); 492102b0fbb9SMat Martineau 49228d5a04a1SMat Martineau return 0; 49238d5a04a1SMat Martineau } 49248d5a04a1SMat Martineau 49255b155ef9SMat Martineau static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) 49265b155ef9SMat Martineau { 49275b155ef9SMat Martineau struct l2cap_chan *chan; 49285b155ef9SMat Martineau struct hci_chan *hchan = NULL; 49295b155ef9SMat Martineau 49305b155ef9SMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 49315b155ef9SMat Martineau if (!chan) { 49325b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 49335b155ef9SMat Martineau return; 49345b155ef9SMat Martineau } 49355b155ef9SMat Martineau 49365b155ef9SMat Martineau __clear_chan_timer(chan); 49375b155ef9SMat Martineau if (result == L2CAP_MR_PEND) 49385b155ef9SMat Martineau __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); 49395b155ef9SMat Martineau 49405b155ef9SMat Martineau switch (chan->move_state) { 49415b155ef9SMat Martineau case L2CAP_MOVE_WAIT_LOGICAL_COMP: 49425b155ef9SMat Martineau /* Move confirm will be sent when logical link 49435b155ef9SMat Martineau * is complete. 49445b155ef9SMat Martineau */ 49455b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 49465b155ef9SMat Martineau break; 49475b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP_SUCCESS: 49485b155ef9SMat Martineau if (result == L2CAP_MR_PEND) { 49495b155ef9SMat Martineau break; 49505b155ef9SMat Martineau } else if (test_bit(CONN_LOCAL_BUSY, 49515b155ef9SMat Martineau &chan->conn_state)) { 49525b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; 49535b155ef9SMat Martineau } else { 49545b155ef9SMat Martineau /* Logical link is up or moving to BR/EDR, 49555b155ef9SMat Martineau * proceed with move 49565b155ef9SMat Martineau */ 49575b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; 49585b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 49595b155ef9SMat Martineau } 49605b155ef9SMat Martineau break; 49615b155ef9SMat Martineau case L2CAP_MOVE_WAIT_RSP: 49625b155ef9SMat Martineau /* Moving to AMP */ 49635b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 49645b155ef9SMat Martineau /* Remote is ready, send confirm immediately 49655b155ef9SMat Martineau * after logical link is ready 49665b155ef9SMat Martineau */ 49675b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; 49685b155ef9SMat Martineau } else { 49695b155ef9SMat Martineau /* Both logical link and move success 49705b155ef9SMat Martineau * are required to confirm 49715b155ef9SMat Martineau */ 49725b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; 49735b155ef9SMat Martineau } 49745b155ef9SMat Martineau 49755b155ef9SMat Martineau /* Placeholder - get hci_chan for logical link */ 49765b155ef9SMat Martineau if (!hchan) { 49775b155ef9SMat Martineau /* Logical link not available */ 49785b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 49795b155ef9SMat Martineau break; 49805b155ef9SMat Martineau } 49815b155ef9SMat Martineau 49825b155ef9SMat Martineau /* If the logical link is not yet connected, do not 49835b155ef9SMat Martineau * send confirmation. 49845b155ef9SMat Martineau */ 49855b155ef9SMat Martineau if (hchan->state != BT_CONNECTED) 49865b155ef9SMat Martineau break; 49875b155ef9SMat Martineau 49885b155ef9SMat Martineau /* Logical link is already ready to go */ 49895b155ef9SMat Martineau 49905b155ef9SMat Martineau chan->hs_hcon = hchan->conn; 49915b155ef9SMat Martineau chan->hs_hcon->l2cap_data = chan->conn; 49925b155ef9SMat Martineau 49935b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS) { 49945b155ef9SMat Martineau /* Can confirm now */ 49955b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); 49965b155ef9SMat Martineau } else { 49975b155ef9SMat Martineau /* Now only need move success 49985b155ef9SMat Martineau * to confirm 49995b155ef9SMat Martineau */ 50005b155ef9SMat Martineau chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; 50015b155ef9SMat Martineau } 50025b155ef9SMat Martineau 50035b155ef9SMat Martineau l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); 50045b155ef9SMat Martineau break; 50055b155ef9SMat Martineau default: 50065b155ef9SMat Martineau /* Any other amp move state means the move failed. */ 50075b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 50085b155ef9SMat Martineau l2cap_move_done(chan); 50095b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50105b155ef9SMat Martineau } 50115b155ef9SMat Martineau 50125b155ef9SMat Martineau l2cap_chan_unlock(chan); 50135b155ef9SMat Martineau } 50145b155ef9SMat Martineau 50155b155ef9SMat Martineau static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, 50165b155ef9SMat Martineau u16 result) 50175b155ef9SMat Martineau { 50185b155ef9SMat Martineau struct l2cap_chan *chan; 50195b155ef9SMat Martineau 50205b155ef9SMat Martineau chan = l2cap_get_chan_by_ident(conn, ident); 50215b155ef9SMat Martineau if (!chan) { 50225b155ef9SMat Martineau /* Could not locate channel, icid is best guess */ 50235b155ef9SMat Martineau l2cap_send_move_chan_cfm_icid(conn, icid); 50245b155ef9SMat Martineau return; 50255b155ef9SMat Martineau } 50265b155ef9SMat Martineau 50275b155ef9SMat Martineau __clear_chan_timer(chan); 50285b155ef9SMat Martineau 50295b155ef9SMat Martineau if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { 50305b155ef9SMat Martineau if (result == L2CAP_MR_COLLISION) { 50315b155ef9SMat Martineau chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; 50325b155ef9SMat Martineau } else { 50335b155ef9SMat Martineau /* Cleanup - cancel move */ 50345b155ef9SMat Martineau chan->move_id = chan->local_amp_id; 50355b155ef9SMat Martineau l2cap_move_done(chan); 50365b155ef9SMat Martineau } 50375b155ef9SMat Martineau } 50385b155ef9SMat Martineau 50395b155ef9SMat Martineau l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); 50405b155ef9SMat Martineau 50415b155ef9SMat Martineau l2cap_chan_unlock(chan); 50425b155ef9SMat Martineau } 50435b155ef9SMat Martineau 50445b155ef9SMat Martineau static int l2cap_move_channel_rsp(struct l2cap_conn *conn, 5045ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5046ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 50478d5a04a1SMat Martineau { 50488d5a04a1SMat Martineau struct l2cap_move_chan_rsp *rsp = data; 50498d5a04a1SMat Martineau u16 icid, result; 50508d5a04a1SMat Martineau 50518d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 50528d5a04a1SMat Martineau return -EPROTO; 50538d5a04a1SMat Martineau 50548d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 50558d5a04a1SMat Martineau result = le16_to_cpu(rsp->result); 50568d5a04a1SMat Martineau 5057ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 50588d5a04a1SMat Martineau 50595b155ef9SMat Martineau if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) 50605b155ef9SMat Martineau l2cap_move_continue(conn, icid, result); 50615b155ef9SMat Martineau else 50625b155ef9SMat Martineau l2cap_move_fail(conn, cmd->ident, icid, result); 50638d5a04a1SMat Martineau 50648d5a04a1SMat Martineau return 0; 50658d5a04a1SMat Martineau } 50668d5a04a1SMat Martineau 50675f3847a4SMat Martineau static int l2cap_move_channel_confirm(struct l2cap_conn *conn, 5068ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5069ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 50708d5a04a1SMat Martineau { 50718d5a04a1SMat Martineau struct l2cap_move_chan_cfm *cfm = data; 50725f3847a4SMat Martineau struct l2cap_chan *chan; 50738d5a04a1SMat Martineau u16 icid, result; 50748d5a04a1SMat Martineau 50758d5a04a1SMat Martineau if (cmd_len != sizeof(*cfm)) 50768d5a04a1SMat Martineau return -EPROTO; 50778d5a04a1SMat Martineau 50788d5a04a1SMat Martineau icid = le16_to_cpu(cfm->icid); 50798d5a04a1SMat Martineau result = le16_to_cpu(cfm->result); 50808d5a04a1SMat Martineau 5081ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); 50828d5a04a1SMat Martineau 50835f3847a4SMat Martineau chan = l2cap_get_chan_by_dcid(conn, icid); 50845f3847a4SMat Martineau if (!chan) { 50855f3847a4SMat Martineau /* Spec requires a response even if the icid was not found */ 50868d5a04a1SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 50875f3847a4SMat Martineau return 0; 50885f3847a4SMat Martineau } 50895f3847a4SMat Martineau 50905f3847a4SMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { 50915f3847a4SMat Martineau if (result == L2CAP_MC_CONFIRMED) { 50925f3847a4SMat Martineau chan->local_amp_id = chan->move_id; 50935f3847a4SMat Martineau if (!chan->local_amp_id) 50945f3847a4SMat Martineau __release_logical_link(chan); 50955f3847a4SMat Martineau } else { 50965f3847a4SMat Martineau chan->move_id = chan->local_amp_id; 50975f3847a4SMat Martineau } 50985f3847a4SMat Martineau 50995f3847a4SMat Martineau l2cap_move_done(chan); 51005f3847a4SMat Martineau } 51015f3847a4SMat Martineau 51025f3847a4SMat Martineau l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); 51035f3847a4SMat Martineau 51045f3847a4SMat Martineau l2cap_chan_unlock(chan); 51058d5a04a1SMat Martineau 51068d5a04a1SMat Martineau return 0; 51078d5a04a1SMat Martineau } 51088d5a04a1SMat Martineau 51098d5a04a1SMat Martineau static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, 5110ad0ac6caSAndrei Emeltchenko struct l2cap_cmd_hdr *cmd, 5111ad0ac6caSAndrei Emeltchenko u16 cmd_len, void *data) 51128d5a04a1SMat Martineau { 51138d5a04a1SMat Martineau struct l2cap_move_chan_cfm_rsp *rsp = data; 51143fd71a0aSMat Martineau struct l2cap_chan *chan; 51158d5a04a1SMat Martineau u16 icid; 51168d5a04a1SMat Martineau 51178d5a04a1SMat Martineau if (cmd_len != sizeof(*rsp)) 51188d5a04a1SMat Martineau return -EPROTO; 51198d5a04a1SMat Martineau 51208d5a04a1SMat Martineau icid = le16_to_cpu(rsp->icid); 51218d5a04a1SMat Martineau 5122ad0ac6caSAndrei Emeltchenko BT_DBG("icid 0x%4.4x", icid); 51238d5a04a1SMat Martineau 51243fd71a0aSMat Martineau chan = l2cap_get_chan_by_scid(conn, icid); 51253fd71a0aSMat Martineau if (!chan) 51263fd71a0aSMat Martineau return 0; 51273fd71a0aSMat Martineau 51283fd71a0aSMat Martineau __clear_chan_timer(chan); 51293fd71a0aSMat Martineau 51303fd71a0aSMat Martineau if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { 51313fd71a0aSMat Martineau chan->local_amp_id = chan->move_id; 51323fd71a0aSMat Martineau 51333fd71a0aSMat Martineau if (!chan->local_amp_id && chan->hs_hchan) 51343fd71a0aSMat Martineau __release_logical_link(chan); 51353fd71a0aSMat Martineau 51363fd71a0aSMat Martineau l2cap_move_done(chan); 51373fd71a0aSMat Martineau } 51383fd71a0aSMat Martineau 51393fd71a0aSMat Martineau l2cap_chan_unlock(chan); 51403fd71a0aSMat Martineau 51418d5a04a1SMat Martineau return 0; 51428d5a04a1SMat Martineau } 51438d5a04a1SMat Martineau 5144e2174ca4SGustavo F. Padovan static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, 5145de73115aSClaudio Takahasi u16 to_multiplier) 5146de73115aSClaudio Takahasi { 5147de73115aSClaudio Takahasi u16 max_latency; 5148de73115aSClaudio Takahasi 5149de73115aSClaudio Takahasi if (min > max || min < 6 || max > 3200) 5150de73115aSClaudio Takahasi return -EINVAL; 5151de73115aSClaudio Takahasi 5152de73115aSClaudio Takahasi if (to_multiplier < 10 || to_multiplier > 3200) 5153de73115aSClaudio Takahasi return -EINVAL; 5154de73115aSClaudio Takahasi 5155de73115aSClaudio Takahasi if (max >= to_multiplier * 8) 5156de73115aSClaudio Takahasi return -EINVAL; 5157de73115aSClaudio Takahasi 5158de73115aSClaudio Takahasi max_latency = (to_multiplier * 8 / max) - 1; 5159de73115aSClaudio Takahasi if (latency > 499 || latency > max_latency) 5160de73115aSClaudio Takahasi return -EINVAL; 5161de73115aSClaudio Takahasi 5162de73115aSClaudio Takahasi return 0; 5163de73115aSClaudio Takahasi } 5164de73115aSClaudio Takahasi 5165de73115aSClaudio Takahasi static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, 51662d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, 51672d792818SGustavo Padovan u8 *data) 5168de73115aSClaudio Takahasi { 5169de73115aSClaudio Takahasi struct hci_conn *hcon = conn->hcon; 5170de73115aSClaudio Takahasi struct l2cap_conn_param_update_req *req; 5171de73115aSClaudio Takahasi struct l2cap_conn_param_update_rsp rsp; 5172de73115aSClaudio Takahasi u16 min, max, latency, to_multiplier, cmd_len; 51732ce603ebSClaudio Takahasi int err; 5174de73115aSClaudio Takahasi 5175de73115aSClaudio Takahasi if (!(hcon->link_mode & HCI_LM_MASTER)) 5176de73115aSClaudio Takahasi return -EINVAL; 5177de73115aSClaudio Takahasi 5178de73115aSClaudio Takahasi cmd_len = __le16_to_cpu(cmd->len); 5179de73115aSClaudio Takahasi if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) 5180de73115aSClaudio Takahasi return -EPROTO; 5181de73115aSClaudio Takahasi 5182de73115aSClaudio Takahasi req = (struct l2cap_conn_param_update_req *) data; 5183de73115aSClaudio Takahasi min = __le16_to_cpu(req->min); 5184de73115aSClaudio Takahasi max = __le16_to_cpu(req->max); 5185de73115aSClaudio Takahasi latency = __le16_to_cpu(req->latency); 5186de73115aSClaudio Takahasi to_multiplier = __le16_to_cpu(req->to_multiplier); 5187de73115aSClaudio Takahasi 5188de73115aSClaudio Takahasi BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", 5189de73115aSClaudio Takahasi min, max, latency, to_multiplier); 5190de73115aSClaudio Takahasi 5191de73115aSClaudio Takahasi memset(&rsp, 0, sizeof(rsp)); 51922ce603ebSClaudio Takahasi 51932ce603ebSClaudio Takahasi err = l2cap_check_conn_param(min, max, latency, to_multiplier); 51942ce603ebSClaudio Takahasi if (err) 5195ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); 5196de73115aSClaudio Takahasi else 5197ac73498cSAndrei Emeltchenko rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); 5198de73115aSClaudio Takahasi 5199de73115aSClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, 5200de73115aSClaudio Takahasi sizeof(rsp), &rsp); 5201de73115aSClaudio Takahasi 52022ce603ebSClaudio Takahasi if (!err) 52032ce603ebSClaudio Takahasi hci_le_conn_update(hcon, min, max, latency, to_multiplier); 52042ce603ebSClaudio Takahasi 5205de73115aSClaudio Takahasi return 0; 5206de73115aSClaudio Takahasi } 5207de73115aSClaudio Takahasi 52083300d9a9SClaudio Takahasi static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, 52092d792818SGustavo Padovan struct l2cap_cmd_hdr *cmd, u16 cmd_len, 52102d792818SGustavo Padovan u8 *data) 52113300d9a9SClaudio Takahasi { 52123300d9a9SClaudio Takahasi int err = 0; 52133300d9a9SClaudio Takahasi 52143300d9a9SClaudio Takahasi switch (cmd->code) { 52153300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 5216cb3b3152SJohan Hedberg l2cap_command_rej(conn, cmd, cmd_len, data); 52173300d9a9SClaudio Takahasi break; 52183300d9a9SClaudio Takahasi 52193300d9a9SClaudio Takahasi case L2CAP_CONN_REQ: 5220cb3b3152SJohan Hedberg err = l2cap_connect_req(conn, cmd, cmd_len, data); 52213300d9a9SClaudio Takahasi break; 52223300d9a9SClaudio Takahasi 52233300d9a9SClaudio Takahasi case L2CAP_CONN_RSP: 5224f5a2598dSMat Martineau case L2CAP_CREATE_CHAN_RSP: 52259245e737SJohan Hedberg l2cap_connect_create_rsp(conn, cmd, cmd_len, data); 52263300d9a9SClaudio Takahasi break; 52273300d9a9SClaudio Takahasi 52283300d9a9SClaudio Takahasi case L2CAP_CONF_REQ: 52293300d9a9SClaudio Takahasi err = l2cap_config_req(conn, cmd, cmd_len, data); 52303300d9a9SClaudio Takahasi break; 52313300d9a9SClaudio Takahasi 52323300d9a9SClaudio Takahasi case L2CAP_CONF_RSP: 52339245e737SJohan Hedberg l2cap_config_rsp(conn, cmd, cmd_len, data); 52343300d9a9SClaudio Takahasi break; 52353300d9a9SClaudio Takahasi 52363300d9a9SClaudio Takahasi case L2CAP_DISCONN_REQ: 5237cb3b3152SJohan Hedberg err = l2cap_disconnect_req(conn, cmd, cmd_len, data); 52383300d9a9SClaudio Takahasi break; 52393300d9a9SClaudio Takahasi 52403300d9a9SClaudio Takahasi case L2CAP_DISCONN_RSP: 52419245e737SJohan Hedberg l2cap_disconnect_rsp(conn, cmd, cmd_len, data); 52423300d9a9SClaudio Takahasi break; 52433300d9a9SClaudio Takahasi 52443300d9a9SClaudio Takahasi case L2CAP_ECHO_REQ: 52453300d9a9SClaudio Takahasi l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); 52463300d9a9SClaudio Takahasi break; 52473300d9a9SClaudio Takahasi 52483300d9a9SClaudio Takahasi case L2CAP_ECHO_RSP: 52493300d9a9SClaudio Takahasi break; 52503300d9a9SClaudio Takahasi 52513300d9a9SClaudio Takahasi case L2CAP_INFO_REQ: 5252cb3b3152SJohan Hedberg err = l2cap_information_req(conn, cmd, cmd_len, data); 52533300d9a9SClaudio Takahasi break; 52543300d9a9SClaudio Takahasi 52553300d9a9SClaudio Takahasi case L2CAP_INFO_RSP: 52569245e737SJohan Hedberg l2cap_information_rsp(conn, cmd, cmd_len, data); 52573300d9a9SClaudio Takahasi break; 52583300d9a9SClaudio Takahasi 5259f94ff6ffSMat Martineau case L2CAP_CREATE_CHAN_REQ: 5260f94ff6ffSMat Martineau err = l2cap_create_channel_req(conn, cmd, cmd_len, data); 5261f94ff6ffSMat Martineau break; 5262f94ff6ffSMat Martineau 52638d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_REQ: 52648d5a04a1SMat Martineau err = l2cap_move_channel_req(conn, cmd, cmd_len, data); 52658d5a04a1SMat Martineau break; 52668d5a04a1SMat Martineau 52678d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_RSP: 52689245e737SJohan Hedberg l2cap_move_channel_rsp(conn, cmd, cmd_len, data); 52698d5a04a1SMat Martineau break; 52708d5a04a1SMat Martineau 52718d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM: 52728d5a04a1SMat Martineau err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); 52738d5a04a1SMat Martineau break; 52748d5a04a1SMat Martineau 52758d5a04a1SMat Martineau case L2CAP_MOVE_CHAN_CFM_RSP: 52769245e737SJohan Hedberg l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); 52778d5a04a1SMat Martineau break; 52788d5a04a1SMat Martineau 52793300d9a9SClaudio Takahasi default: 52803300d9a9SClaudio Takahasi BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); 52813300d9a9SClaudio Takahasi err = -EINVAL; 52823300d9a9SClaudio Takahasi break; 52833300d9a9SClaudio Takahasi } 52843300d9a9SClaudio Takahasi 52853300d9a9SClaudio Takahasi return err; 52863300d9a9SClaudio Takahasi } 52873300d9a9SClaudio Takahasi 52883300d9a9SClaudio Takahasi static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, 52893300d9a9SClaudio Takahasi struct l2cap_cmd_hdr *cmd, u8 *data) 52903300d9a9SClaudio Takahasi { 52913300d9a9SClaudio Takahasi switch (cmd->code) { 52923300d9a9SClaudio Takahasi case L2CAP_COMMAND_REJ: 52933300d9a9SClaudio Takahasi return 0; 52943300d9a9SClaudio Takahasi 52953300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_REQ: 5296de73115aSClaudio Takahasi return l2cap_conn_param_update_req(conn, cmd, data); 52973300d9a9SClaudio Takahasi 52983300d9a9SClaudio Takahasi case L2CAP_CONN_PARAM_UPDATE_RSP: 52993300d9a9SClaudio Takahasi return 0; 53003300d9a9SClaudio Takahasi 53013300d9a9SClaudio Takahasi default: 53023300d9a9SClaudio Takahasi BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); 53033300d9a9SClaudio Takahasi return -EINVAL; 53043300d9a9SClaudio Takahasi } 53053300d9a9SClaudio Takahasi } 53063300d9a9SClaudio Takahasi 53077c2005d6SJohan Hedberg static __le16 l2cap_err_to_reason(int err) 53087c2005d6SJohan Hedberg { 53097c2005d6SJohan Hedberg switch (err) { 53107c2005d6SJohan Hedberg case -EBADSLT: 53117c2005d6SJohan Hedberg return __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); 53127c2005d6SJohan Hedberg case -EMSGSIZE: 53137c2005d6SJohan Hedberg return __constant_cpu_to_le16(L2CAP_REJ_MTU_EXCEEDED); 53147c2005d6SJohan Hedberg case -EINVAL: 53157c2005d6SJohan Hedberg case -EPROTO: 53167c2005d6SJohan Hedberg default: 53177c2005d6SJohan Hedberg return __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); 53187c2005d6SJohan Hedberg } 53197c2005d6SJohan Hedberg } 53207c2005d6SJohan Hedberg 5321c5623556SJohan Hedberg static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, 5322c5623556SJohan Hedberg struct sk_buff *skb) 5323c5623556SJohan Hedberg { 532469c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 5325c5623556SJohan Hedberg u8 *data = skb->data; 5326c5623556SJohan Hedberg int len = skb->len; 5327c5623556SJohan Hedberg struct l2cap_cmd_hdr cmd; 5328c5623556SJohan Hedberg int err; 5329c5623556SJohan Hedberg 5330c5623556SJohan Hedberg l2cap_raw_recv(conn, skb); 5331c5623556SJohan Hedberg 533269c4e4e8SJohan Hedberg if (hcon->type != LE_LINK) 53333b166295SMarcel Holtmann goto drop; 533469c4e4e8SJohan Hedberg 5335c5623556SJohan Hedberg while (len >= L2CAP_CMD_HDR_SIZE) { 5336c5623556SJohan Hedberg u16 cmd_len; 5337c5623556SJohan Hedberg memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 5338c5623556SJohan Hedberg data += L2CAP_CMD_HDR_SIZE; 5339c5623556SJohan Hedberg len -= L2CAP_CMD_HDR_SIZE; 5340c5623556SJohan Hedberg 5341c5623556SJohan Hedberg cmd_len = le16_to_cpu(cmd.len); 5342c5623556SJohan Hedberg 5343c5623556SJohan Hedberg BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 5344c5623556SJohan Hedberg cmd.ident); 5345c5623556SJohan Hedberg 5346c5623556SJohan Hedberg if (cmd_len > len || !cmd.ident) { 5347c5623556SJohan Hedberg BT_DBG("corrupted command"); 5348c5623556SJohan Hedberg break; 5349c5623556SJohan Hedberg } 5350c5623556SJohan Hedberg 5351c5623556SJohan Hedberg err = l2cap_le_sig_cmd(conn, &cmd, data); 5352c5623556SJohan Hedberg if (err) { 5353c5623556SJohan Hedberg struct l2cap_cmd_rej_unk rej; 5354c5623556SJohan Hedberg 5355c5623556SJohan Hedberg BT_ERR("Wrong link type (%d)", err); 5356c5623556SJohan Hedberg 53577c2005d6SJohan Hedberg rej.reason = l2cap_err_to_reason(err); 5358c5623556SJohan Hedberg l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 5359c5623556SJohan Hedberg sizeof(rej), &rej); 5360c5623556SJohan Hedberg } 5361c5623556SJohan Hedberg 5362c5623556SJohan Hedberg data += cmd_len; 5363c5623556SJohan Hedberg len -= cmd_len; 5364c5623556SJohan Hedberg } 5365c5623556SJohan Hedberg 53663b166295SMarcel Holtmann drop: 5367c5623556SJohan Hedberg kfree_skb(skb); 5368c5623556SJohan Hedberg } 5369c5623556SJohan Hedberg 53703300d9a9SClaudio Takahasi static inline void l2cap_sig_channel(struct l2cap_conn *conn, 53713300d9a9SClaudio Takahasi struct sk_buff *skb) 53720a708f8fSGustavo F. Padovan { 537369c4e4e8SJohan Hedberg struct hci_conn *hcon = conn->hcon; 53740a708f8fSGustavo F. Padovan u8 *data = skb->data; 53750a708f8fSGustavo F. Padovan int len = skb->len; 53760a708f8fSGustavo F. Padovan struct l2cap_cmd_hdr cmd; 53773300d9a9SClaudio Takahasi int err; 53780a708f8fSGustavo F. Padovan 53790a708f8fSGustavo F. Padovan l2cap_raw_recv(conn, skb); 53800a708f8fSGustavo F. Padovan 538169c4e4e8SJohan Hedberg if (hcon->type != ACL_LINK) 53823b166295SMarcel Holtmann goto drop; 538369c4e4e8SJohan Hedberg 53840a708f8fSGustavo F. Padovan while (len >= L2CAP_CMD_HDR_SIZE) { 53850a708f8fSGustavo F. Padovan u16 cmd_len; 53860a708f8fSGustavo F. Padovan memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); 53870a708f8fSGustavo F. Padovan data += L2CAP_CMD_HDR_SIZE; 53880a708f8fSGustavo F. Padovan len -= L2CAP_CMD_HDR_SIZE; 53890a708f8fSGustavo F. Padovan 53900a708f8fSGustavo F. Padovan cmd_len = le16_to_cpu(cmd.len); 53910a708f8fSGustavo F. Padovan 53922d792818SGustavo Padovan BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, 53932d792818SGustavo Padovan cmd.ident); 53940a708f8fSGustavo F. Padovan 53950a708f8fSGustavo F. Padovan if (cmd_len > len || !cmd.ident) { 53960a708f8fSGustavo F. Padovan BT_DBG("corrupted command"); 53970a708f8fSGustavo F. Padovan break; 53980a708f8fSGustavo F. Padovan } 53990a708f8fSGustavo F. Padovan 54003300d9a9SClaudio Takahasi err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); 54010a708f8fSGustavo F. Padovan if (err) { 5402e2fd318eSIlia Kolomisnky struct l2cap_cmd_rej_unk rej; 54032c6d1a2eSGustavo F. Padovan 54042c6d1a2eSGustavo F. Padovan BT_ERR("Wrong link type (%d)", err); 54050a708f8fSGustavo F. Padovan 54067c2005d6SJohan Hedberg rej.reason = l2cap_err_to_reason(err); 54072d792818SGustavo Padovan l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, 54082d792818SGustavo Padovan sizeof(rej), &rej); 54090a708f8fSGustavo F. Padovan } 54100a708f8fSGustavo F. Padovan 54110a708f8fSGustavo F. Padovan data += cmd_len; 54120a708f8fSGustavo F. Padovan len -= cmd_len; 54130a708f8fSGustavo F. Padovan } 54140a708f8fSGustavo F. Padovan 54153b166295SMarcel Holtmann drop: 54160a708f8fSGustavo F. Padovan kfree_skb(skb); 54170a708f8fSGustavo F. Padovan } 54180a708f8fSGustavo F. Padovan 541947d1ec61SGustavo F. Padovan static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) 54200a708f8fSGustavo F. Padovan { 54210a708f8fSGustavo F. Padovan u16 our_fcs, rcv_fcs; 5422e4ca6d98SAndrei Emeltchenko int hdr_size; 5423e4ca6d98SAndrei Emeltchenko 5424e4ca6d98SAndrei Emeltchenko if (test_bit(FLAG_EXT_CTRL, &chan->flags)) 5425e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_EXT_HDR_SIZE; 5426e4ca6d98SAndrei Emeltchenko else 5427e4ca6d98SAndrei Emeltchenko hdr_size = L2CAP_ENH_HDR_SIZE; 54280a708f8fSGustavo F. Padovan 542947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) { 543003a51213SAndrei Emeltchenko skb_trim(skb, skb->len - L2CAP_FCS_SIZE); 54310a708f8fSGustavo F. Padovan rcv_fcs = get_unaligned_le16(skb->data + skb->len); 54320a708f8fSGustavo F. Padovan our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); 54330a708f8fSGustavo F. Padovan 54340a708f8fSGustavo F. Padovan if (our_fcs != rcv_fcs) 54350a708f8fSGustavo F. Padovan return -EBADMSG; 54360a708f8fSGustavo F. Padovan } 54370a708f8fSGustavo F. Padovan return 0; 54380a708f8fSGustavo F. Padovan } 54390a708f8fSGustavo F. Padovan 54406ea00485SMat Martineau static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) 54410a708f8fSGustavo F. Padovan { 5442e31f7633SMat Martineau struct l2cap_ctrl control; 54430a708f8fSGustavo F. Padovan 5444e31f7633SMat Martineau BT_DBG("chan %p", chan); 54450a708f8fSGustavo F. Padovan 5446e31f7633SMat Martineau memset(&control, 0, sizeof(control)); 5447e31f7633SMat Martineau control.sframe = 1; 5448e31f7633SMat Martineau control.final = 1; 5449e31f7633SMat Martineau control.reqseq = chan->buffer_seq; 5450e31f7633SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 54510a708f8fSGustavo F. Padovan 5452e2ab4353SGustavo F. Padovan if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5453e31f7633SMat Martineau control.super = L2CAP_SUPER_RNR; 5454e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 54550a708f8fSGustavo F. Padovan } 54560a708f8fSGustavo F. Padovan 5457e31f7633SMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && 5458e31f7633SMat Martineau chan->unacked_frames > 0) 5459e31f7633SMat Martineau __set_retrans_timer(chan); 54600a708f8fSGustavo F. Padovan 5461e31f7633SMat Martineau /* Send pending iframes */ 5462525cd185SGustavo F. Padovan l2cap_ertm_send(chan); 54630a708f8fSGustavo F. Padovan 5464e2ab4353SGustavo F. Padovan if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && 5465e31f7633SMat Martineau test_bit(CONN_SEND_FBIT, &chan->conn_state)) { 5466e31f7633SMat Martineau /* F-bit wasn't sent in an s-frame or i-frame yet, so 5467e31f7633SMat Martineau * send it now. 5468e31f7633SMat Martineau */ 5469e31f7633SMat Martineau control.super = L2CAP_SUPER_RR; 5470e31f7633SMat Martineau l2cap_send_sframe(chan, &control); 54710a708f8fSGustavo F. Padovan } 54720a708f8fSGustavo F. Padovan } 54730a708f8fSGustavo F. Padovan 54742d792818SGustavo Padovan static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, 54752d792818SGustavo Padovan struct sk_buff **last_frag) 54760a708f8fSGustavo F. Padovan { 547784084a31SMat Martineau /* skb->len reflects data in skb as well as all fragments 547884084a31SMat Martineau * skb->data_len reflects only data in fragments 547984084a31SMat Martineau */ 548084084a31SMat Martineau if (!skb_has_frag_list(skb)) 548184084a31SMat Martineau skb_shinfo(skb)->frag_list = new_frag; 548284084a31SMat Martineau 548384084a31SMat Martineau new_frag->next = NULL; 548484084a31SMat Martineau 548584084a31SMat Martineau (*last_frag)->next = new_frag; 548684084a31SMat Martineau *last_frag = new_frag; 548784084a31SMat Martineau 548884084a31SMat Martineau skb->len += new_frag->len; 548984084a31SMat Martineau skb->data_len += new_frag->len; 549084084a31SMat Martineau skb->truesize += new_frag->truesize; 549184084a31SMat Martineau } 549284084a31SMat Martineau 54934b51dae9SMat Martineau static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, 54944b51dae9SMat Martineau struct l2cap_ctrl *control) 549584084a31SMat Martineau { 549684084a31SMat Martineau int err = -EINVAL; 54970a708f8fSGustavo F. Padovan 54984b51dae9SMat Martineau switch (control->sar) { 54997e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_UNSEGMENTED: 550084084a31SMat Martineau if (chan->sdu) 550184084a31SMat Martineau break; 55020a708f8fSGustavo F. Padovan 550380b98027SGustavo Padovan err = chan->ops->recv(chan, skb); 550484084a31SMat Martineau break; 55050a708f8fSGustavo F. Padovan 55067e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_START: 550784084a31SMat Martineau if (chan->sdu) 550884084a31SMat Martineau break; 55090a708f8fSGustavo F. Padovan 55106f61fd47SGustavo F. Padovan chan->sdu_len = get_unaligned_le16(skb->data); 551103a51213SAndrei Emeltchenko skb_pull(skb, L2CAP_SDULEN_SIZE); 55120a708f8fSGustavo F. Padovan 551384084a31SMat Martineau if (chan->sdu_len > chan->imtu) { 551484084a31SMat Martineau err = -EMSGSIZE; 551584084a31SMat Martineau break; 551684084a31SMat Martineau } 55170a708f8fSGustavo F. Padovan 551884084a31SMat Martineau if (skb->len >= chan->sdu_len) 551984084a31SMat Martineau break; 552084084a31SMat Martineau 552184084a31SMat Martineau chan->sdu = skb; 552284084a31SMat Martineau chan->sdu_last_frag = skb; 552384084a31SMat Martineau 552484084a31SMat Martineau skb = NULL; 552584084a31SMat Martineau err = 0; 55260a708f8fSGustavo F. Padovan break; 55270a708f8fSGustavo F. Padovan 55287e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_CONTINUE: 55296f61fd47SGustavo F. Padovan if (!chan->sdu) 553084084a31SMat Martineau break; 55310a708f8fSGustavo F. Padovan 553284084a31SMat Martineau append_skb_frag(chan->sdu, skb, 553384084a31SMat Martineau &chan->sdu_last_frag); 553484084a31SMat Martineau skb = NULL; 55350a708f8fSGustavo F. Padovan 553684084a31SMat Martineau if (chan->sdu->len >= chan->sdu_len) 553784084a31SMat Martineau break; 55380a708f8fSGustavo F. Padovan 553984084a31SMat Martineau err = 0; 55400a708f8fSGustavo F. Padovan break; 55410a708f8fSGustavo F. Padovan 55427e0ef6eeSAndrei Emeltchenko case L2CAP_SAR_END: 55436f61fd47SGustavo F. Padovan if (!chan->sdu) 554484084a31SMat Martineau break; 55450a708f8fSGustavo F. Padovan 554684084a31SMat Martineau append_skb_frag(chan->sdu, skb, 554784084a31SMat Martineau &chan->sdu_last_frag); 554884084a31SMat Martineau skb = NULL; 55490a708f8fSGustavo F. Padovan 555084084a31SMat Martineau if (chan->sdu->len != chan->sdu_len) 555184084a31SMat Martineau break; 55520a708f8fSGustavo F. Padovan 555380b98027SGustavo Padovan err = chan->ops->recv(chan, chan->sdu); 55540a708f8fSGustavo F. Padovan 555584084a31SMat Martineau if (!err) { 555684084a31SMat Martineau /* Reassembly complete */ 555784084a31SMat Martineau chan->sdu = NULL; 555884084a31SMat Martineau chan->sdu_last_frag = NULL; 555984084a31SMat Martineau chan->sdu_len = 0; 55600a708f8fSGustavo F. Padovan } 55610a708f8fSGustavo F. Padovan break; 55620a708f8fSGustavo F. Padovan } 55630a708f8fSGustavo F. Padovan 556484084a31SMat Martineau if (err) { 55650a708f8fSGustavo F. Padovan kfree_skb(skb); 55666f61fd47SGustavo F. Padovan kfree_skb(chan->sdu); 55676f61fd47SGustavo F. Padovan chan->sdu = NULL; 556884084a31SMat Martineau chan->sdu_last_frag = NULL; 556984084a31SMat Martineau chan->sdu_len = 0; 557084084a31SMat Martineau } 55710a708f8fSGustavo F. Padovan 557284084a31SMat Martineau return err; 55730a708f8fSGustavo F. Padovan } 55740a708f8fSGustavo F. Padovan 557532b32735SMat Martineau static int l2cap_resegment(struct l2cap_chan *chan) 557632b32735SMat Martineau { 557732b32735SMat Martineau /* Placeholder */ 557832b32735SMat Martineau return 0; 557932b32735SMat Martineau } 558032b32735SMat Martineau 5581e328140fSMat Martineau void l2cap_chan_busy(struct l2cap_chan *chan, int busy) 55820a708f8fSGustavo F. Padovan { 558361aa4f5bSMat Martineau u8 event; 558461aa4f5bSMat Martineau 558561aa4f5bSMat Martineau if (chan->mode != L2CAP_MODE_ERTM) 558661aa4f5bSMat Martineau return; 558761aa4f5bSMat Martineau 558861aa4f5bSMat Martineau event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; 5589401bb1f7SAndrei Emeltchenko l2cap_tx(chan, NULL, NULL, event); 55900a708f8fSGustavo F. Padovan } 55910a708f8fSGustavo F. Padovan 5592d2a7ac5dSMat Martineau static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) 5593d2a7ac5dSMat Martineau { 559463838725SMat Martineau int err = 0; 559563838725SMat Martineau /* Pass sequential frames to l2cap_reassemble_sdu() 559663838725SMat Martineau * until a gap is encountered. 559763838725SMat Martineau */ 559863838725SMat Martineau 559963838725SMat Martineau BT_DBG("chan %p", chan); 560063838725SMat Martineau 560163838725SMat Martineau while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 560263838725SMat Martineau struct sk_buff *skb; 560363838725SMat Martineau BT_DBG("Searching for skb with txseq %d (queue len %d)", 560463838725SMat Martineau chan->buffer_seq, skb_queue_len(&chan->srej_q)); 560563838725SMat Martineau 560663838725SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); 560763838725SMat Martineau 560863838725SMat Martineau if (!skb) 560963838725SMat Martineau break; 561063838725SMat Martineau 561163838725SMat Martineau skb_unlink(skb, &chan->srej_q); 561263838725SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 561363838725SMat Martineau err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); 561463838725SMat Martineau if (err) 561563838725SMat Martineau break; 561663838725SMat Martineau } 561763838725SMat Martineau 561863838725SMat Martineau if (skb_queue_empty(&chan->srej_q)) { 561963838725SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 562063838725SMat Martineau l2cap_send_ack(chan); 562163838725SMat Martineau } 562263838725SMat Martineau 562363838725SMat Martineau return err; 5624d2a7ac5dSMat Martineau } 5625d2a7ac5dSMat Martineau 5626d2a7ac5dSMat Martineau static void l2cap_handle_srej(struct l2cap_chan *chan, 5627d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5628d2a7ac5dSMat Martineau { 5629f80842a8SMat Martineau struct sk_buff *skb; 5630f80842a8SMat Martineau 5631f80842a8SMat Martineau BT_DBG("chan %p, control %p", chan, control); 5632f80842a8SMat Martineau 5633f80842a8SMat Martineau if (control->reqseq == chan->next_tx_seq) { 5634f80842a8SMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 56355e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5636f80842a8SMat Martineau return; 5637f80842a8SMat Martineau } 5638f80842a8SMat Martineau 5639f80842a8SMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5640f80842a8SMat Martineau 5641f80842a8SMat Martineau if (skb == NULL) { 5642f80842a8SMat Martineau BT_DBG("Seq %d not available for retransmission", 5643f80842a8SMat Martineau control->reqseq); 5644f80842a8SMat Martineau return; 5645f80842a8SMat Martineau } 5646f80842a8SMat Martineau 5647f80842a8SMat Martineau if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { 5648f80842a8SMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 56495e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5650f80842a8SMat Martineau return; 5651f80842a8SMat Martineau } 5652f80842a8SMat Martineau 5653f80842a8SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5654f80842a8SMat Martineau 5655f80842a8SMat Martineau if (control->poll) { 5656f80842a8SMat Martineau l2cap_pass_to_tx(chan, control); 5657f80842a8SMat Martineau 5658f80842a8SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5659f80842a8SMat Martineau l2cap_retransmit(chan, control); 5660f80842a8SMat Martineau l2cap_ertm_send(chan); 5661f80842a8SMat Martineau 5662f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5663f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5664f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5665f80842a8SMat Martineau } 5666f80842a8SMat Martineau } else { 5667f80842a8SMat Martineau l2cap_pass_to_tx_fbit(chan, control); 5668f80842a8SMat Martineau 5669f80842a8SMat Martineau if (control->final) { 5670f80842a8SMat Martineau if (chan->srej_save_reqseq != control->reqseq || 5671f80842a8SMat Martineau !test_and_clear_bit(CONN_SREJ_ACT, 5672f80842a8SMat Martineau &chan->conn_state)) 5673f80842a8SMat Martineau l2cap_retransmit(chan, control); 5674f80842a8SMat Martineau } else { 5675f80842a8SMat Martineau l2cap_retransmit(chan, control); 5676f80842a8SMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { 5677f80842a8SMat Martineau set_bit(CONN_SREJ_ACT, &chan->conn_state); 5678f80842a8SMat Martineau chan->srej_save_reqseq = control->reqseq; 5679f80842a8SMat Martineau } 5680f80842a8SMat Martineau } 5681f80842a8SMat Martineau } 5682d2a7ac5dSMat Martineau } 5683d2a7ac5dSMat Martineau 5684d2a7ac5dSMat Martineau static void l2cap_handle_rej(struct l2cap_chan *chan, 5685d2a7ac5dSMat Martineau struct l2cap_ctrl *control) 5686d2a7ac5dSMat Martineau { 5687fcd289dfSMat Martineau struct sk_buff *skb; 5688fcd289dfSMat Martineau 5689fcd289dfSMat Martineau BT_DBG("chan %p, control %p", chan, control); 5690fcd289dfSMat Martineau 5691fcd289dfSMat Martineau if (control->reqseq == chan->next_tx_seq) { 5692fcd289dfSMat Martineau BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); 56935e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5694fcd289dfSMat Martineau return; 5695fcd289dfSMat Martineau } 5696fcd289dfSMat Martineau 5697fcd289dfSMat Martineau skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); 5698fcd289dfSMat Martineau 5699fcd289dfSMat Martineau if (chan->max_tx && skb && 5700fcd289dfSMat Martineau bt_cb(skb)->control.retries >= chan->max_tx) { 5701fcd289dfSMat Martineau BT_DBG("Retry limit exceeded (%d)", chan->max_tx); 57025e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5703fcd289dfSMat Martineau return; 5704fcd289dfSMat Martineau } 5705fcd289dfSMat Martineau 5706fcd289dfSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5707fcd289dfSMat Martineau 5708fcd289dfSMat Martineau l2cap_pass_to_tx(chan, control); 5709fcd289dfSMat Martineau 5710fcd289dfSMat Martineau if (control->final) { 5711fcd289dfSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) 5712fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 5713fcd289dfSMat Martineau } else { 5714fcd289dfSMat Martineau l2cap_retransmit_all(chan, control); 5715fcd289dfSMat Martineau l2cap_ertm_send(chan); 5716fcd289dfSMat Martineau if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) 5717fcd289dfSMat Martineau set_bit(CONN_REJ_ACT, &chan->conn_state); 5718fcd289dfSMat Martineau } 5719d2a7ac5dSMat Martineau } 5720d2a7ac5dSMat Martineau 57214b51dae9SMat Martineau static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) 57224b51dae9SMat Martineau { 57234b51dae9SMat Martineau BT_DBG("chan %p, txseq %d", chan, txseq); 57244b51dae9SMat Martineau 57254b51dae9SMat Martineau BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, 57264b51dae9SMat Martineau chan->expected_tx_seq); 57274b51dae9SMat Martineau 57284b51dae9SMat Martineau if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { 57294b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 57304b51dae9SMat Martineau chan->tx_win) { 57314b51dae9SMat Martineau /* See notes below regarding "double poll" and 57324b51dae9SMat Martineau * invalid packets. 57334b51dae9SMat Martineau */ 57344b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 57354b51dae9SMat Martineau BT_DBG("Invalid/Ignore - after SREJ"); 57364b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 57374b51dae9SMat Martineau } else { 57384b51dae9SMat Martineau BT_DBG("Invalid - in window after SREJ sent"); 57394b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 57404b51dae9SMat Martineau } 57414b51dae9SMat Martineau } 57424b51dae9SMat Martineau 57434b51dae9SMat Martineau if (chan->srej_list.head == txseq) { 57444b51dae9SMat Martineau BT_DBG("Expected SREJ"); 57454b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED_SREJ; 57464b51dae9SMat Martineau } 57474b51dae9SMat Martineau 57484b51dae9SMat Martineau if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { 57494b51dae9SMat Martineau BT_DBG("Duplicate SREJ - txseq already stored"); 57504b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE_SREJ; 57514b51dae9SMat Martineau } 57524b51dae9SMat Martineau 57534b51dae9SMat Martineau if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { 57544b51dae9SMat Martineau BT_DBG("Unexpected SREJ - not requested"); 57554b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED_SREJ; 57564b51dae9SMat Martineau } 57574b51dae9SMat Martineau } 57584b51dae9SMat Martineau 57594b51dae9SMat Martineau if (chan->expected_tx_seq == txseq) { 57604b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= 57614b51dae9SMat Martineau chan->tx_win) { 57624b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 57634b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 57644b51dae9SMat Martineau } else { 57654b51dae9SMat Martineau BT_DBG("Expected"); 57664b51dae9SMat Martineau return L2CAP_TXSEQ_EXPECTED; 57674b51dae9SMat Martineau } 57684b51dae9SMat Martineau } 57694b51dae9SMat Martineau 57704b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) < 57712d792818SGustavo Padovan __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { 57724b51dae9SMat Martineau BT_DBG("Duplicate - expected_tx_seq later than txseq"); 57734b51dae9SMat Martineau return L2CAP_TXSEQ_DUPLICATE; 57744b51dae9SMat Martineau } 57754b51dae9SMat Martineau 57764b51dae9SMat Martineau if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { 57774b51dae9SMat Martineau /* A source of invalid packets is a "double poll" condition, 57784b51dae9SMat Martineau * where delays cause us to send multiple poll packets. If 57794b51dae9SMat Martineau * the remote stack receives and processes both polls, 57804b51dae9SMat Martineau * sequence numbers can wrap around in such a way that a 57814b51dae9SMat Martineau * resent frame has a sequence number that looks like new data 57824b51dae9SMat Martineau * with a sequence gap. This would trigger an erroneous SREJ 57834b51dae9SMat Martineau * request. 57844b51dae9SMat Martineau * 57854b51dae9SMat Martineau * Fortunately, this is impossible with a tx window that's 57864b51dae9SMat Martineau * less than half of the maximum sequence number, which allows 57874b51dae9SMat Martineau * invalid frames to be safely ignored. 57884b51dae9SMat Martineau * 57894b51dae9SMat Martineau * With tx window sizes greater than half of the tx window 57904b51dae9SMat Martineau * maximum, the frame is invalid and cannot be ignored. This 57914b51dae9SMat Martineau * causes a disconnect. 57924b51dae9SMat Martineau */ 57934b51dae9SMat Martineau 57944b51dae9SMat Martineau if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { 57954b51dae9SMat Martineau BT_DBG("Invalid/Ignore - txseq outside tx window"); 57964b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID_IGNORE; 57974b51dae9SMat Martineau } else { 57984b51dae9SMat Martineau BT_DBG("Invalid - txseq outside tx window"); 57994b51dae9SMat Martineau return L2CAP_TXSEQ_INVALID; 58004b51dae9SMat Martineau } 58014b51dae9SMat Martineau } else { 58024b51dae9SMat Martineau BT_DBG("Unexpected - txseq indicates missing frames"); 58034b51dae9SMat Martineau return L2CAP_TXSEQ_UNEXPECTED; 58044b51dae9SMat Martineau } 58054b51dae9SMat Martineau } 58064b51dae9SMat Martineau 5807d2a7ac5dSMat Martineau static int l2cap_rx_state_recv(struct l2cap_chan *chan, 5808d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 5809d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 5810d2a7ac5dSMat Martineau { 5811d2a7ac5dSMat Martineau int err = 0; 5812941247f9SPeter Senna Tschudin bool skb_in_use = false; 5813d2a7ac5dSMat Martineau 5814d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 5815d2a7ac5dSMat Martineau event); 5816d2a7ac5dSMat Martineau 5817d2a7ac5dSMat Martineau switch (event) { 5818d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 5819d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, control->txseq)) { 5820d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 5821d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5822d2a7ac5dSMat Martineau 5823d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5824d2a7ac5dSMat Martineau BT_DBG("Busy, discarding expected seq %d", 5825d2a7ac5dSMat Martineau control->txseq); 5826d2a7ac5dSMat Martineau break; 5827d2a7ac5dSMat Martineau } 5828d2a7ac5dSMat Martineau 5829d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, 5830d2a7ac5dSMat Martineau control->txseq); 5831d2a7ac5dSMat Martineau 5832d2a7ac5dSMat Martineau chan->buffer_seq = chan->expected_tx_seq; 5833941247f9SPeter Senna Tschudin skb_in_use = true; 5834d2a7ac5dSMat Martineau 5835d2a7ac5dSMat Martineau err = l2cap_reassemble_sdu(chan, skb, control); 5836d2a7ac5dSMat Martineau if (err) 5837d2a7ac5dSMat Martineau break; 5838d2a7ac5dSMat Martineau 5839d2a7ac5dSMat Martineau if (control->final) { 5840d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 5841d2a7ac5dSMat Martineau &chan->conn_state)) { 5842d2a7ac5dSMat Martineau control->final = 0; 5843d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5844d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5845d2a7ac5dSMat Martineau } 5846d2a7ac5dSMat Martineau } 5847d2a7ac5dSMat Martineau 5848d2a7ac5dSMat Martineau if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) 5849d2a7ac5dSMat Martineau l2cap_send_ack(chan); 5850d2a7ac5dSMat Martineau break; 5851d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 5852d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5853d2a7ac5dSMat Martineau 5854d2a7ac5dSMat Martineau /* Can't issue SREJ frames in the local busy state. 5855d2a7ac5dSMat Martineau * Drop this frame, it will be seen as missing 5856d2a7ac5dSMat Martineau * when local busy is exited. 5857d2a7ac5dSMat Martineau */ 5858d2a7ac5dSMat Martineau if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { 5859d2a7ac5dSMat Martineau BT_DBG("Busy, discarding unexpected seq %d", 5860d2a7ac5dSMat Martineau control->txseq); 5861d2a7ac5dSMat Martineau break; 5862d2a7ac5dSMat Martineau } 5863d2a7ac5dSMat Martineau 5864d2a7ac5dSMat Martineau /* There was a gap in the sequence, so an SREJ 5865d2a7ac5dSMat Martineau * must be sent for each missing frame. The 5866d2a7ac5dSMat Martineau * current frame is stored for later use. 5867d2a7ac5dSMat Martineau */ 5868d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5869941247f9SPeter Senna Tschudin skb_in_use = true; 5870d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5871d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5872d2a7ac5dSMat Martineau 5873d2a7ac5dSMat Martineau clear_bit(CONN_SREJ_ACT, &chan->conn_state); 5874d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->srej_list); 5875d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 5876d2a7ac5dSMat Martineau 5877d2a7ac5dSMat Martineau chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; 5878d2a7ac5dSMat Martineau break; 5879d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 5880d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5881d2a7ac5dSMat Martineau break; 5882d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 5883d2a7ac5dSMat Martineau break; 5884d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 5885d2a7ac5dSMat Martineau default: 58865e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 5887d2a7ac5dSMat Martineau break; 5888d2a7ac5dSMat Martineau } 5889d2a7ac5dSMat Martineau break; 5890d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 5891d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5892d2a7ac5dSMat Martineau if (control->final) { 5893d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5894d2a7ac5dSMat Martineau 5895e6a3ee6eSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && 5896e6a3ee6eSMat Martineau !__chan_is_moving(chan)) { 5897d2a7ac5dSMat Martineau control->final = 0; 5898d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 5899d2a7ac5dSMat Martineau } 5900d2a7ac5dSMat Martineau 5901d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5902d2a7ac5dSMat Martineau } else if (control->poll) { 5903d2a7ac5dSMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 5904d2a7ac5dSMat Martineau } else { 5905d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 5906d2a7ac5dSMat Martineau &chan->conn_state) && 5907d2a7ac5dSMat Martineau chan->unacked_frames) 5908d2a7ac5dSMat Martineau __set_retrans_timer(chan); 5909d2a7ac5dSMat Martineau 5910d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 5911d2a7ac5dSMat Martineau } 5912d2a7ac5dSMat Martineau break; 5913d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 5914d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 5915d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5916d2a7ac5dSMat Martineau if (control && control->poll) { 5917d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 5918d2a7ac5dSMat Martineau l2cap_send_rr_or_rnr(chan, 0); 5919d2a7ac5dSMat Martineau } 5920d2a7ac5dSMat Martineau __clear_retrans_timer(chan); 5921d2a7ac5dSMat Martineau l2cap_seq_list_clear(&chan->retrans_list); 5922d2a7ac5dSMat Martineau break; 5923d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 5924d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 5925d2a7ac5dSMat Martineau break; 5926d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 5927d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 5928d2a7ac5dSMat Martineau break; 5929d2a7ac5dSMat Martineau default: 5930d2a7ac5dSMat Martineau break; 5931d2a7ac5dSMat Martineau } 5932d2a7ac5dSMat Martineau 5933d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 5934d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 5935d2a7ac5dSMat Martineau kfree_skb(skb); 5936d2a7ac5dSMat Martineau } 5937d2a7ac5dSMat Martineau 5938d2a7ac5dSMat Martineau return err; 5939d2a7ac5dSMat Martineau } 5940d2a7ac5dSMat Martineau 5941d2a7ac5dSMat Martineau static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, 5942d2a7ac5dSMat Martineau struct l2cap_ctrl *control, 5943d2a7ac5dSMat Martineau struct sk_buff *skb, u8 event) 5944d2a7ac5dSMat Martineau { 5945d2a7ac5dSMat Martineau int err = 0; 5946d2a7ac5dSMat Martineau u16 txseq = control->txseq; 5947941247f9SPeter Senna Tschudin bool skb_in_use = false; 5948d2a7ac5dSMat Martineau 5949d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 5950d2a7ac5dSMat Martineau event); 5951d2a7ac5dSMat Martineau 5952d2a7ac5dSMat Martineau switch (event) { 5953d2a7ac5dSMat Martineau case L2CAP_EV_RECV_IFRAME: 5954d2a7ac5dSMat Martineau switch (l2cap_classify_txseq(chan, txseq)) { 5955d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED: 5956d2a7ac5dSMat Martineau /* Keep frame for reassembly later */ 5957d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5958d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5959941247f9SPeter Senna Tschudin skb_in_use = true; 5960d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5961d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5962d2a7ac5dSMat Martineau 5963d2a7ac5dSMat Martineau chan->expected_tx_seq = __next_seq(chan, txseq); 5964d2a7ac5dSMat Martineau break; 5965d2a7ac5dSMat Martineau case L2CAP_TXSEQ_EXPECTED_SREJ: 5966d2a7ac5dSMat Martineau l2cap_seq_list_pop(&chan->srej_list); 5967d2a7ac5dSMat Martineau 5968d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5969d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5970941247f9SPeter Senna Tschudin skb_in_use = true; 5971d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5972d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5973d2a7ac5dSMat Martineau 5974d2a7ac5dSMat Martineau err = l2cap_rx_queued_iframes(chan); 5975d2a7ac5dSMat Martineau if (err) 5976d2a7ac5dSMat Martineau break; 5977d2a7ac5dSMat Martineau 5978d2a7ac5dSMat Martineau break; 5979d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED: 5980d2a7ac5dSMat Martineau /* Got a frame that can't be reassembled yet. 5981d2a7ac5dSMat Martineau * Save it for later, and send SREJs to cover 5982d2a7ac5dSMat Martineau * the missing frames. 5983d2a7ac5dSMat Martineau */ 5984d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5985941247f9SPeter Senna Tschudin skb_in_use = true; 5986d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 5987d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 5988d2a7ac5dSMat Martineau 5989d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 5990d2a7ac5dSMat Martineau l2cap_send_srej(chan, control->txseq); 5991d2a7ac5dSMat Martineau break; 5992d2a7ac5dSMat Martineau case L2CAP_TXSEQ_UNEXPECTED_SREJ: 5993d2a7ac5dSMat Martineau /* This frame was requested with an SREJ, but 5994d2a7ac5dSMat Martineau * some expected retransmitted frames are 5995d2a7ac5dSMat Martineau * missing. Request retransmission of missing 5996d2a7ac5dSMat Martineau * SREJ'd frames. 5997d2a7ac5dSMat Martineau */ 5998d2a7ac5dSMat Martineau skb_queue_tail(&chan->srej_q, skb); 5999941247f9SPeter Senna Tschudin skb_in_use = true; 6000d2a7ac5dSMat Martineau BT_DBG("Queued %p (queue len %d)", skb, 6001d2a7ac5dSMat Martineau skb_queue_len(&chan->srej_q)); 6002d2a7ac5dSMat Martineau 6003d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6004d2a7ac5dSMat Martineau l2cap_send_srej_list(chan, control->txseq); 6005d2a7ac5dSMat Martineau break; 6006d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE_SREJ: 6007d2a7ac5dSMat Martineau /* We've already queued this frame. Drop this copy. */ 6008d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6009d2a7ac5dSMat Martineau break; 6010d2a7ac5dSMat Martineau case L2CAP_TXSEQ_DUPLICATE: 6011d2a7ac5dSMat Martineau /* Expecting a later sequence number, so this frame 6012d2a7ac5dSMat Martineau * was already received. Ignore it completely. 6013d2a7ac5dSMat Martineau */ 6014d2a7ac5dSMat Martineau break; 6015d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID_IGNORE: 6016d2a7ac5dSMat Martineau break; 6017d2a7ac5dSMat Martineau case L2CAP_TXSEQ_INVALID: 6018d2a7ac5dSMat Martineau default: 60195e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6020d2a7ac5dSMat Martineau break; 6021d2a7ac5dSMat Martineau } 6022d2a7ac5dSMat Martineau break; 6023d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RR: 6024d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6025d2a7ac5dSMat Martineau if (control->final) { 6026d2a7ac5dSMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6027d2a7ac5dSMat Martineau 6028d2a7ac5dSMat Martineau if (!test_and_clear_bit(CONN_REJ_ACT, 6029d2a7ac5dSMat Martineau &chan->conn_state)) { 6030d2a7ac5dSMat Martineau control->final = 0; 6031d2a7ac5dSMat Martineau l2cap_retransmit_all(chan, control); 6032d2a7ac5dSMat Martineau } 6033d2a7ac5dSMat Martineau 6034d2a7ac5dSMat Martineau l2cap_ertm_send(chan); 6035d2a7ac5dSMat Martineau } else if (control->poll) { 6036d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6037d2a7ac5dSMat Martineau &chan->conn_state) && 6038d2a7ac5dSMat Martineau chan->unacked_frames) { 6039d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6040d2a7ac5dSMat Martineau } 6041d2a7ac5dSMat Martineau 6042d2a7ac5dSMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 6043d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6044d2a7ac5dSMat Martineau } else { 6045d2a7ac5dSMat Martineau if (test_and_clear_bit(CONN_REMOTE_BUSY, 6046d2a7ac5dSMat Martineau &chan->conn_state) && 6047d2a7ac5dSMat Martineau chan->unacked_frames) 6048d2a7ac5dSMat Martineau __set_retrans_timer(chan); 6049d2a7ac5dSMat Martineau 6050d2a7ac5dSMat Martineau l2cap_send_ack(chan); 6051d2a7ac5dSMat Martineau } 6052d2a7ac5dSMat Martineau break; 6053d2a7ac5dSMat Martineau case L2CAP_EV_RECV_RNR: 6054d2a7ac5dSMat Martineau set_bit(CONN_REMOTE_BUSY, &chan->conn_state); 6055d2a7ac5dSMat Martineau l2cap_pass_to_tx(chan, control); 6056d2a7ac5dSMat Martineau if (control->poll) { 6057d2a7ac5dSMat Martineau l2cap_send_srej_tail(chan); 6058d2a7ac5dSMat Martineau } else { 6059d2a7ac5dSMat Martineau struct l2cap_ctrl rr_control; 6060d2a7ac5dSMat Martineau memset(&rr_control, 0, sizeof(rr_control)); 6061d2a7ac5dSMat Martineau rr_control.sframe = 1; 6062d2a7ac5dSMat Martineau rr_control.super = L2CAP_SUPER_RR; 6063d2a7ac5dSMat Martineau rr_control.reqseq = chan->buffer_seq; 6064d2a7ac5dSMat Martineau l2cap_send_sframe(chan, &rr_control); 6065d2a7ac5dSMat Martineau } 6066d2a7ac5dSMat Martineau 6067d2a7ac5dSMat Martineau break; 6068d2a7ac5dSMat Martineau case L2CAP_EV_RECV_REJ: 6069d2a7ac5dSMat Martineau l2cap_handle_rej(chan, control); 6070d2a7ac5dSMat Martineau break; 6071d2a7ac5dSMat Martineau case L2CAP_EV_RECV_SREJ: 6072d2a7ac5dSMat Martineau l2cap_handle_srej(chan, control); 6073d2a7ac5dSMat Martineau break; 6074d2a7ac5dSMat Martineau } 6075d2a7ac5dSMat Martineau 6076d2a7ac5dSMat Martineau if (skb && !skb_in_use) { 6077d2a7ac5dSMat Martineau BT_DBG("Freeing %p", skb); 6078d2a7ac5dSMat Martineau kfree_skb(skb); 6079d2a7ac5dSMat Martineau } 6080d2a7ac5dSMat Martineau 6081d2a7ac5dSMat Martineau return err; 6082d2a7ac5dSMat Martineau } 6083d2a7ac5dSMat Martineau 608432b32735SMat Martineau static int l2cap_finish_move(struct l2cap_chan *chan) 608532b32735SMat Martineau { 608632b32735SMat Martineau BT_DBG("chan %p", chan); 608732b32735SMat Martineau 608832b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 608932b32735SMat Martineau 609032b32735SMat Martineau if (chan->hs_hcon) 609132b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 609232b32735SMat Martineau else 609332b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 609432b32735SMat Martineau 609532b32735SMat Martineau return l2cap_resegment(chan); 609632b32735SMat Martineau } 609732b32735SMat Martineau 609832b32735SMat Martineau static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, 609932b32735SMat Martineau struct l2cap_ctrl *control, 610032b32735SMat Martineau struct sk_buff *skb, u8 event) 610132b32735SMat Martineau { 610232b32735SMat Martineau int err; 610332b32735SMat Martineau 610432b32735SMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, 610532b32735SMat Martineau event); 610632b32735SMat Martineau 610732b32735SMat Martineau if (!control->poll) 610832b32735SMat Martineau return -EPROTO; 610932b32735SMat Martineau 611032b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 611132b32735SMat Martineau 611232b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 611332b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 611432b32735SMat Martineau else 611532b32735SMat Martineau chan->tx_send_head = NULL; 611632b32735SMat Martineau 611732b32735SMat Martineau /* Rewind next_tx_seq to the point expected 611832b32735SMat Martineau * by the receiver. 611932b32735SMat Martineau */ 612032b32735SMat Martineau chan->next_tx_seq = control->reqseq; 612132b32735SMat Martineau chan->unacked_frames = 0; 612232b32735SMat Martineau 612332b32735SMat Martineau err = l2cap_finish_move(chan); 612432b32735SMat Martineau if (err) 612532b32735SMat Martineau return err; 612632b32735SMat Martineau 612732b32735SMat Martineau set_bit(CONN_SEND_FBIT, &chan->conn_state); 612832b32735SMat Martineau l2cap_send_i_or_rr_or_rnr(chan); 612932b32735SMat Martineau 613032b32735SMat Martineau if (event == L2CAP_EV_RECV_IFRAME) 613132b32735SMat Martineau return -EPROTO; 613232b32735SMat Martineau 613332b32735SMat Martineau return l2cap_rx_state_recv(chan, control, NULL, event); 613432b32735SMat Martineau } 613532b32735SMat Martineau 613632b32735SMat Martineau static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, 613732b32735SMat Martineau struct l2cap_ctrl *control, 613832b32735SMat Martineau struct sk_buff *skb, u8 event) 613932b32735SMat Martineau { 614032b32735SMat Martineau int err; 614132b32735SMat Martineau 614232b32735SMat Martineau if (!control->final) 614332b32735SMat Martineau return -EPROTO; 614432b32735SMat Martineau 614532b32735SMat Martineau clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); 614632b32735SMat Martineau 614732b32735SMat Martineau chan->rx_state = L2CAP_RX_STATE_RECV; 614832b32735SMat Martineau l2cap_process_reqseq(chan, control->reqseq); 614932b32735SMat Martineau 615032b32735SMat Martineau if (!skb_queue_empty(&chan->tx_q)) 615132b32735SMat Martineau chan->tx_send_head = skb_peek(&chan->tx_q); 615232b32735SMat Martineau else 615332b32735SMat Martineau chan->tx_send_head = NULL; 615432b32735SMat Martineau 615532b32735SMat Martineau /* Rewind next_tx_seq to the point expected 615632b32735SMat Martineau * by the receiver. 615732b32735SMat Martineau */ 615832b32735SMat Martineau chan->next_tx_seq = control->reqseq; 615932b32735SMat Martineau chan->unacked_frames = 0; 616032b32735SMat Martineau 616132b32735SMat Martineau if (chan->hs_hcon) 616232b32735SMat Martineau chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; 616332b32735SMat Martineau else 616432b32735SMat Martineau chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; 616532b32735SMat Martineau 616632b32735SMat Martineau err = l2cap_resegment(chan); 616732b32735SMat Martineau 616832b32735SMat Martineau if (!err) 616932b32735SMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 617032b32735SMat Martineau 617132b32735SMat Martineau return err; 617232b32735SMat Martineau } 617332b32735SMat Martineau 6174d2a7ac5dSMat Martineau static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) 6175d2a7ac5dSMat Martineau { 6176d2a7ac5dSMat Martineau /* Make sure reqseq is for a packet that has been sent but not acked */ 6177d2a7ac5dSMat Martineau u16 unacked; 6178d2a7ac5dSMat Martineau 6179d2a7ac5dSMat Martineau unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); 6180d2a7ac5dSMat Martineau return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; 6181d2a7ac5dSMat Martineau } 6182d2a7ac5dSMat Martineau 6183cec8ab6eSMat Martineau static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6184cec8ab6eSMat Martineau struct sk_buff *skb, u8 event) 61850a708f8fSGustavo F. Padovan { 6186d2a7ac5dSMat Martineau int err = 0; 6187d2a7ac5dSMat Martineau 6188d2a7ac5dSMat Martineau BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, 6189d2a7ac5dSMat Martineau control, skb, event, chan->rx_state); 6190d2a7ac5dSMat Martineau 6191d2a7ac5dSMat Martineau if (__valid_reqseq(chan, control->reqseq)) { 6192d2a7ac5dSMat Martineau switch (chan->rx_state) { 6193d2a7ac5dSMat Martineau case L2CAP_RX_STATE_RECV: 6194d2a7ac5dSMat Martineau err = l2cap_rx_state_recv(chan, control, skb, event); 6195d2a7ac5dSMat Martineau break; 6196d2a7ac5dSMat Martineau case L2CAP_RX_STATE_SREJ_SENT: 6197d2a7ac5dSMat Martineau err = l2cap_rx_state_srej_sent(chan, control, skb, 6198d2a7ac5dSMat Martineau event); 6199d2a7ac5dSMat Martineau break; 620032b32735SMat Martineau case L2CAP_RX_STATE_WAIT_P: 620132b32735SMat Martineau err = l2cap_rx_state_wait_p(chan, control, skb, event); 620232b32735SMat Martineau break; 620332b32735SMat Martineau case L2CAP_RX_STATE_WAIT_F: 620432b32735SMat Martineau err = l2cap_rx_state_wait_f(chan, control, skb, event); 620532b32735SMat Martineau break; 6206d2a7ac5dSMat Martineau default: 6207d2a7ac5dSMat Martineau /* shut it down */ 6208d2a7ac5dSMat Martineau break; 6209d2a7ac5dSMat Martineau } 6210d2a7ac5dSMat Martineau } else { 6211d2a7ac5dSMat Martineau BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", 6212d2a7ac5dSMat Martineau control->reqseq, chan->next_tx_seq, 6213d2a7ac5dSMat Martineau chan->expected_ack_seq); 62145e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6215d2a7ac5dSMat Martineau } 6216d2a7ac5dSMat Martineau 6217d2a7ac5dSMat Martineau return err; 6218cec8ab6eSMat Martineau } 6219cec8ab6eSMat Martineau 6220cec8ab6eSMat Martineau static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, 6221cec8ab6eSMat Martineau struct sk_buff *skb) 6222cec8ab6eSMat Martineau { 62234b51dae9SMat Martineau int err = 0; 62244b51dae9SMat Martineau 62254b51dae9SMat Martineau BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, 62264b51dae9SMat Martineau chan->rx_state); 62274b51dae9SMat Martineau 62284b51dae9SMat Martineau if (l2cap_classify_txseq(chan, control->txseq) == 62294b51dae9SMat Martineau L2CAP_TXSEQ_EXPECTED) { 62304b51dae9SMat Martineau l2cap_pass_to_tx(chan, control); 62314b51dae9SMat Martineau 62324b51dae9SMat Martineau BT_DBG("buffer_seq %d->%d", chan->buffer_seq, 62334b51dae9SMat Martineau __next_seq(chan, chan->buffer_seq)); 62344b51dae9SMat Martineau 62354b51dae9SMat Martineau chan->buffer_seq = __next_seq(chan, chan->buffer_seq); 62364b51dae9SMat Martineau 62374b51dae9SMat Martineau l2cap_reassemble_sdu(chan, skb, control); 62384b51dae9SMat Martineau } else { 62394b51dae9SMat Martineau if (chan->sdu) { 62404b51dae9SMat Martineau kfree_skb(chan->sdu); 62414b51dae9SMat Martineau chan->sdu = NULL; 62424b51dae9SMat Martineau } 62434b51dae9SMat Martineau chan->sdu_last_frag = NULL; 62444b51dae9SMat Martineau chan->sdu_len = 0; 62454b51dae9SMat Martineau 62464b51dae9SMat Martineau if (skb) { 62474b51dae9SMat Martineau BT_DBG("Freeing %p", skb); 62484b51dae9SMat Martineau kfree_skb(skb); 62494b51dae9SMat Martineau } 62504b51dae9SMat Martineau } 62514b51dae9SMat Martineau 62524b51dae9SMat Martineau chan->last_acked_seq = control->txseq; 62534b51dae9SMat Martineau chan->expected_tx_seq = __next_seq(chan, control->txseq); 62544b51dae9SMat Martineau 62554b51dae9SMat Martineau return err; 6256cec8ab6eSMat Martineau } 6257cec8ab6eSMat Martineau 6258cec8ab6eSMat Martineau static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 6259cec8ab6eSMat Martineau { 6260cec8ab6eSMat Martineau struct l2cap_ctrl *control = &bt_cb(skb)->control; 6261cec8ab6eSMat Martineau u16 len; 6262cec8ab6eSMat Martineau u8 event; 62630a708f8fSGustavo F. Padovan 6264b76bbd66SMat Martineau __unpack_control(chan, skb); 6265b76bbd66SMat Martineau 62660a708f8fSGustavo F. Padovan len = skb->len; 62670a708f8fSGustavo F. Padovan 62680a708f8fSGustavo F. Padovan /* 62690a708f8fSGustavo F. Padovan * We can just drop the corrupted I-frame here. 62700a708f8fSGustavo F. Padovan * Receiver will miss it and start proper recovery 6271cec8ab6eSMat Martineau * procedures and ask for retransmission. 62720a708f8fSGustavo F. Padovan */ 627347d1ec61SGustavo F. Padovan if (l2cap_check_fcs(chan, skb)) 62740a708f8fSGustavo F. Padovan goto drop; 62750a708f8fSGustavo F. Padovan 6276cec8ab6eSMat Martineau if (!control->sframe && control->sar == L2CAP_SAR_START) 627703a51213SAndrei Emeltchenko len -= L2CAP_SDULEN_SIZE; 62780a708f8fSGustavo F. Padovan 627947d1ec61SGustavo F. Padovan if (chan->fcs == L2CAP_FCS_CRC16) 628003a51213SAndrei Emeltchenko len -= L2CAP_FCS_SIZE; 62810a708f8fSGustavo F. Padovan 628247d1ec61SGustavo F. Padovan if (len > chan->mps) { 62835e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 62840a708f8fSGustavo F. Padovan goto drop; 62850a708f8fSGustavo F. Padovan } 62860a708f8fSGustavo F. Padovan 6287cec8ab6eSMat Martineau if (!control->sframe) { 6288cec8ab6eSMat Martineau int err; 62890a708f8fSGustavo F. Padovan 6290cec8ab6eSMat Martineau BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", 6291cec8ab6eSMat Martineau control->sar, control->reqseq, control->final, 6292cec8ab6eSMat Martineau control->txseq); 6293836be934SAndrei Emeltchenko 6294cec8ab6eSMat Martineau /* Validate F-bit - F=0 always valid, F=1 only 6295cec8ab6eSMat Martineau * valid in TX WAIT_F 6296cec8ab6eSMat Martineau */ 6297cec8ab6eSMat Martineau if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) 62980a708f8fSGustavo F. Padovan goto drop; 62990a708f8fSGustavo F. Padovan 6300cec8ab6eSMat Martineau if (chan->mode != L2CAP_MODE_STREAMING) { 6301cec8ab6eSMat Martineau event = L2CAP_EV_RECV_IFRAME; 6302cec8ab6eSMat Martineau err = l2cap_rx(chan, control, skb, event); 63030a708f8fSGustavo F. Padovan } else { 6304cec8ab6eSMat Martineau err = l2cap_stream_rx(chan, control, skb); 6305cec8ab6eSMat Martineau } 6306cec8ab6eSMat Martineau 6307cec8ab6eSMat Martineau if (err) 63085e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 6309cec8ab6eSMat Martineau } else { 6310cec8ab6eSMat Martineau const u8 rx_func_to_event[4] = { 6311cec8ab6eSMat Martineau L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, 6312cec8ab6eSMat Martineau L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ 6313cec8ab6eSMat Martineau }; 6314cec8ab6eSMat Martineau 6315cec8ab6eSMat Martineau /* Only I-frames are expected in streaming mode */ 6316cec8ab6eSMat Martineau if (chan->mode == L2CAP_MODE_STREAMING) 6317cec8ab6eSMat Martineau goto drop; 6318cec8ab6eSMat Martineau 6319cec8ab6eSMat Martineau BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", 6320cec8ab6eSMat Martineau control->reqseq, control->final, control->poll, 6321cec8ab6eSMat Martineau control->super); 6322cec8ab6eSMat Martineau 63230a708f8fSGustavo F. Padovan if (len != 0) { 63241bb166e6SAndrei Emeltchenko BT_ERR("Trailing bytes: %d in sframe", len); 63255e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 63260a708f8fSGustavo F. Padovan goto drop; 63270a708f8fSGustavo F. Padovan } 63280a708f8fSGustavo F. Padovan 6329cec8ab6eSMat Martineau /* Validate F and P bits */ 6330cec8ab6eSMat Martineau if (control->final && (control->poll || 6331cec8ab6eSMat Martineau chan->tx_state != L2CAP_TX_STATE_WAIT_F)) 6332cec8ab6eSMat Martineau goto drop; 6333cec8ab6eSMat Martineau 6334cec8ab6eSMat Martineau event = rx_func_to_event[control->super]; 6335cec8ab6eSMat Martineau if (l2cap_rx(chan, control, skb, event)) 63365e4e3972SAndrei Emeltchenko l2cap_send_disconn_req(chan, ECONNRESET); 63370a708f8fSGustavo F. Padovan } 63380a708f8fSGustavo F. Padovan 63390a708f8fSGustavo F. Padovan return 0; 63400a708f8fSGustavo F. Padovan 63410a708f8fSGustavo F. Padovan drop: 63420a708f8fSGustavo F. Padovan kfree_skb(skb); 63430a708f8fSGustavo F. Padovan return 0; 63440a708f8fSGustavo F. Padovan } 63450a708f8fSGustavo F. Padovan 634613ca56e0SAndrei Emeltchenko static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, 634713ca56e0SAndrei Emeltchenko struct sk_buff *skb) 63480a708f8fSGustavo F. Padovan { 634948454079SGustavo F. Padovan struct l2cap_chan *chan; 63500a708f8fSGustavo F. Padovan 6351baa7e1faSGustavo F. Padovan chan = l2cap_get_chan_by_scid(conn, cid); 635248454079SGustavo F. Padovan if (!chan) { 635397e8e89dSAndrei Emeltchenko if (cid == L2CAP_CID_A2MP) { 635497e8e89dSAndrei Emeltchenko chan = a2mp_channel_create(conn, skb); 635597e8e89dSAndrei Emeltchenko if (!chan) { 635697e8e89dSAndrei Emeltchenko kfree_skb(skb); 635713ca56e0SAndrei Emeltchenko return; 635897e8e89dSAndrei Emeltchenko } 635997e8e89dSAndrei Emeltchenko 636097e8e89dSAndrei Emeltchenko l2cap_chan_lock(chan); 636197e8e89dSAndrei Emeltchenko } else { 63620a708f8fSGustavo F. Padovan BT_DBG("unknown cid 0x%4.4x", cid); 63636be36555SAndrei Emeltchenko /* Drop packet and return */ 63643379013bSDan Carpenter kfree_skb(skb); 636513ca56e0SAndrei Emeltchenko return; 63660a708f8fSGustavo F. Padovan } 636797e8e89dSAndrei Emeltchenko } 63680a708f8fSGustavo F. Padovan 636949208c9cSGustavo F. Padovan BT_DBG("chan %p, len %d", chan, skb->len); 63700a708f8fSGustavo F. Padovan 637189bc500eSGustavo F. Padovan if (chan->state != BT_CONNECTED) 63720a708f8fSGustavo F. Padovan goto drop; 63730a708f8fSGustavo F. Padovan 63740c1bc5c6SGustavo F. Padovan switch (chan->mode) { 63750a708f8fSGustavo F. Padovan case L2CAP_MODE_BASIC: 63760a708f8fSGustavo F. Padovan /* If socket recv buffers overflows we drop data here 63770a708f8fSGustavo F. Padovan * which is *bad* because L2CAP has to be reliable. 63780a708f8fSGustavo F. Padovan * But we don't have any other choice. L2CAP doesn't 63790a708f8fSGustavo F. Padovan * provide flow control mechanism. */ 63800a708f8fSGustavo F. Padovan 63810c1bc5c6SGustavo F. Padovan if (chan->imtu < skb->len) 63820a708f8fSGustavo F. Padovan goto drop; 63830a708f8fSGustavo F. Padovan 638480b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 63850a708f8fSGustavo F. Padovan goto done; 63860a708f8fSGustavo F. Padovan break; 63870a708f8fSGustavo F. Padovan 63880a708f8fSGustavo F. Padovan case L2CAP_MODE_ERTM: 63890a708f8fSGustavo F. Padovan case L2CAP_MODE_STREAMING: 6390cec8ab6eSMat Martineau l2cap_data_rcv(chan, skb); 63910a708f8fSGustavo F. Padovan goto done; 63920a708f8fSGustavo F. Padovan 63930a708f8fSGustavo F. Padovan default: 63940c1bc5c6SGustavo F. Padovan BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); 63950a708f8fSGustavo F. Padovan break; 63960a708f8fSGustavo F. Padovan } 63970a708f8fSGustavo F. Padovan 63980a708f8fSGustavo F. Padovan drop: 63990a708f8fSGustavo F. Padovan kfree_skb(skb); 64000a708f8fSGustavo F. Padovan 64010a708f8fSGustavo F. Padovan done: 64026be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 64030a708f8fSGustavo F. Padovan } 64040a708f8fSGustavo F. Padovan 640584104b24SAndrei Emeltchenko static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, 640684104b24SAndrei Emeltchenko struct sk_buff *skb) 64070a708f8fSGustavo F. Padovan { 640823691d75SGustavo F. Padovan struct l2cap_chan *chan; 64090a708f8fSGustavo F. Padovan 6410c2287681SIdo Yariv chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); 641123691d75SGustavo F. Padovan if (!chan) 64120a708f8fSGustavo F. Padovan goto drop; 64130a708f8fSGustavo F. Padovan 64145b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 64150a708f8fSGustavo F. Padovan 641689bc500eSGustavo F. Padovan if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) 64170a708f8fSGustavo F. Padovan goto drop; 64180a708f8fSGustavo F. Padovan 6419e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 64200a708f8fSGustavo F. Padovan goto drop; 64210a708f8fSGustavo F. Padovan 642280b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 642384104b24SAndrei Emeltchenko return; 64240a708f8fSGustavo F. Padovan 64250a708f8fSGustavo F. Padovan drop: 64260a708f8fSGustavo F. Padovan kfree_skb(skb); 64270a708f8fSGustavo F. Padovan } 64280a708f8fSGustavo F. Padovan 642972f78356SMarcel Holtmann static void l2cap_att_channel(struct l2cap_conn *conn, 6430d9b88702SAndrei Emeltchenko struct sk_buff *skb) 64319f69bda6SGustavo F. Padovan { 643223691d75SGustavo F. Padovan struct l2cap_chan *chan; 64339f69bda6SGustavo F. Padovan 6434af1c0134SJohan Hedberg chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, 643572f78356SMarcel Holtmann conn->src, conn->dst); 643623691d75SGustavo F. Padovan if (!chan) 64379f69bda6SGustavo F. Padovan goto drop; 64389f69bda6SGustavo F. Padovan 64395b4cedaaSAndrei Emeltchenko BT_DBG("chan %p, len %d", chan, skb->len); 64409f69bda6SGustavo F. Padovan 6441e13e21dcSVinicius Costa Gomes if (chan->imtu < skb->len) 64429f69bda6SGustavo F. Padovan goto drop; 64439f69bda6SGustavo F. Padovan 644480b98027SGustavo Padovan if (!chan->ops->recv(chan, skb)) 64456810fca7SAndrei Emeltchenko return; 64469f69bda6SGustavo F. Padovan 64479f69bda6SGustavo F. Padovan drop: 64489f69bda6SGustavo F. Padovan kfree_skb(skb); 64499f69bda6SGustavo F. Padovan } 64509f69bda6SGustavo F. Padovan 64510a708f8fSGustavo F. Padovan static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) 64520a708f8fSGustavo F. Padovan { 64530a708f8fSGustavo F. Padovan struct l2cap_hdr *lh = (void *) skb->data; 64540a708f8fSGustavo F. Padovan u16 cid, len; 64550a708f8fSGustavo F. Padovan __le16 psm; 64560a708f8fSGustavo F. Padovan 64570a708f8fSGustavo F. Padovan skb_pull(skb, L2CAP_HDR_SIZE); 64580a708f8fSGustavo F. Padovan cid = __le16_to_cpu(lh->cid); 64590a708f8fSGustavo F. Padovan len = __le16_to_cpu(lh->len); 64600a708f8fSGustavo F. Padovan 64610a708f8fSGustavo F. Padovan if (len != skb->len) { 64620a708f8fSGustavo F. Padovan kfree_skb(skb); 64630a708f8fSGustavo F. Padovan return; 64640a708f8fSGustavo F. Padovan } 64650a708f8fSGustavo F. Padovan 64660a708f8fSGustavo F. Padovan BT_DBG("len %d, cid 0x%4.4x", len, cid); 64670a708f8fSGustavo F. Padovan 64680a708f8fSGustavo F. Padovan switch (cid) { 64690a708f8fSGustavo F. Padovan case L2CAP_CID_SIGNALING: 64700a708f8fSGustavo F. Padovan l2cap_sig_channel(conn, skb); 64710a708f8fSGustavo F. Padovan break; 64720a708f8fSGustavo F. Padovan 64730a708f8fSGustavo F. Padovan case L2CAP_CID_CONN_LESS: 6474097db76cSAndrei Emeltchenko psm = get_unaligned((__le16 *) skb->data); 64750181a70fSAndrei Emeltchenko skb_pull(skb, L2CAP_PSMLEN_SIZE); 64760a708f8fSGustavo F. Padovan l2cap_conless_channel(conn, psm, skb); 64770a708f8fSGustavo F. Padovan break; 64780a708f8fSGustavo F. Padovan 6479073d1cf3SJohan Hedberg case L2CAP_CID_ATT: 648072f78356SMarcel Holtmann l2cap_att_channel(conn, skb); 64819f69bda6SGustavo F. Padovan break; 64829f69bda6SGustavo F. Padovan 6483a2877629SMarcel Holtmann case L2CAP_CID_LE_SIGNALING: 6484a2877629SMarcel Holtmann l2cap_le_sig_channel(conn, skb); 6485a2877629SMarcel Holtmann break; 6486a2877629SMarcel Holtmann 6487b501d6a1SAnderson Briglia case L2CAP_CID_SMP: 6488b501d6a1SAnderson Briglia if (smp_sig_channel(conn, skb)) 6489b501d6a1SAnderson Briglia l2cap_conn_del(conn->hcon, EACCES); 6490b501d6a1SAnderson Briglia break; 6491b501d6a1SAnderson Briglia 64920a708f8fSGustavo F. Padovan default: 64930a708f8fSGustavo F. Padovan l2cap_data_channel(conn, cid, skb); 64940a708f8fSGustavo F. Padovan break; 64950a708f8fSGustavo F. Padovan } 64960a708f8fSGustavo F. Padovan } 64970a708f8fSGustavo F. Padovan 64980a708f8fSGustavo F. Padovan /* ---- L2CAP interface with lower layer (HCI) ---- */ 64990a708f8fSGustavo F. Padovan 6500686ebf28SUlisses Furquim int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) 65010a708f8fSGustavo F. Padovan { 65020a708f8fSGustavo F. Padovan int exact = 0, lm1 = 0, lm2 = 0; 650323691d75SGustavo F. Padovan struct l2cap_chan *c; 65040a708f8fSGustavo F. Padovan 65056ed93dc6SAndrei Emeltchenko BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 65060a708f8fSGustavo F. Padovan 65070a708f8fSGustavo F. Padovan /* Find listening sockets and check their link_mode */ 650823691d75SGustavo F. Padovan read_lock(&chan_list_lock); 650923691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 651023691d75SGustavo F. Padovan struct sock *sk = c->sk; 65114343478fSGustavo F. Padovan 651289bc500eSGustavo F. Padovan if (c->state != BT_LISTEN) 65130a708f8fSGustavo F. Padovan continue; 65140a708f8fSGustavo F. Padovan 65150a708f8fSGustavo F. Padovan if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { 65160a708f8fSGustavo F. Padovan lm1 |= HCI_LM_ACCEPT; 651743bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 65180a708f8fSGustavo F. Padovan lm1 |= HCI_LM_MASTER; 65190a708f8fSGustavo F. Padovan exact++; 65200a708f8fSGustavo F. Padovan } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { 65210a708f8fSGustavo F. Padovan lm2 |= HCI_LM_ACCEPT; 652243bd0f32SAndrei Emeltchenko if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) 65230a708f8fSGustavo F. Padovan lm2 |= HCI_LM_MASTER; 65240a708f8fSGustavo F. Padovan } 65250a708f8fSGustavo F. Padovan } 652623691d75SGustavo F. Padovan read_unlock(&chan_list_lock); 65270a708f8fSGustavo F. Padovan 65280a708f8fSGustavo F. Padovan return exact ? lm1 : lm2; 65290a708f8fSGustavo F. Padovan } 65300a708f8fSGustavo F. Padovan 65319e664631SAndrei Emeltchenko void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) 65320a708f8fSGustavo F. Padovan { 65330a708f8fSGustavo F. Padovan struct l2cap_conn *conn; 65340a708f8fSGustavo F. Padovan 65356ed93dc6SAndrei Emeltchenko BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 65360a708f8fSGustavo F. Padovan 65370a708f8fSGustavo F. Padovan if (!status) { 6538baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 65390a708f8fSGustavo F. Padovan if (conn) 65400a708f8fSGustavo F. Padovan l2cap_conn_ready(conn); 6541ba6fc317SAndrei Emeltchenko } else { 6542e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(status)); 6543ba6fc317SAndrei Emeltchenko } 65440a708f8fSGustavo F. Padovan } 65450a708f8fSGustavo F. Padovan 6546686ebf28SUlisses Furquim int l2cap_disconn_ind(struct hci_conn *hcon) 65470a708f8fSGustavo F. Padovan { 65480a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 65490a708f8fSGustavo F. Padovan 65500a708f8fSGustavo F. Padovan BT_DBG("hcon %p", hcon); 65510a708f8fSGustavo F. Padovan 6552686ebf28SUlisses Furquim if (!conn) 65539f5a0d7bSAndrei Emeltchenko return HCI_ERROR_REMOTE_USER_TERM; 65540a708f8fSGustavo F. Padovan return conn->disc_reason; 65550a708f8fSGustavo F. Padovan } 65560a708f8fSGustavo F. Padovan 65579e664631SAndrei Emeltchenko void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) 65580a708f8fSGustavo F. Padovan { 65590a708f8fSGustavo F. Padovan BT_DBG("hcon %p reason %d", hcon, reason); 65600a708f8fSGustavo F. Padovan 6561e175072fSJoe Perches l2cap_conn_del(hcon, bt_to_errno(reason)); 65620a708f8fSGustavo F. Padovan } 65630a708f8fSGustavo F. Padovan 65644343478fSGustavo F. Padovan static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) 65650a708f8fSGustavo F. Padovan { 6566715ec005SGustavo F. Padovan if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) 65670a708f8fSGustavo F. Padovan return; 65680a708f8fSGustavo F. Padovan 65690a708f8fSGustavo F. Padovan if (encrypt == 0x00) { 65704343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) { 6571ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); 65724343478fSGustavo F. Padovan } else if (chan->sec_level == BT_SECURITY_HIGH) 65730f852724SGustavo F. Padovan l2cap_chan_close(chan, ECONNREFUSED); 65740a708f8fSGustavo F. Padovan } else { 65754343478fSGustavo F. Padovan if (chan->sec_level == BT_SECURITY_MEDIUM) 6576c9b66675SGustavo F. Padovan __clear_chan_timer(chan); 65770a708f8fSGustavo F. Padovan } 65780a708f8fSGustavo F. Padovan } 65790a708f8fSGustavo F. Padovan 6580686ebf28SUlisses Furquim int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) 65810a708f8fSGustavo F. Padovan { 65820a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 658348454079SGustavo F. Padovan struct l2cap_chan *chan; 65840a708f8fSGustavo F. Padovan 65850a708f8fSGustavo F. Padovan if (!conn) 65860a708f8fSGustavo F. Padovan return 0; 65870a708f8fSGustavo F. Padovan 658889d8b407SAndrei Emeltchenko BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); 65890a708f8fSGustavo F. Padovan 6590160dc6acSVinicius Costa Gomes if (hcon->type == LE_LINK) { 659135d4adccSHemant Gupta if (!status && encrypt) 6592160dc6acSVinicius Costa Gomes smp_distribute_keys(conn, 0); 659317cd3f37SUlisses Furquim cancel_delayed_work(&conn->security_timer); 6594160dc6acSVinicius Costa Gomes } 6595160dc6acSVinicius Costa Gomes 65963df91ea2SAndrei Emeltchenko mutex_lock(&conn->chan_lock); 65970a708f8fSGustavo F. Padovan 65983df91ea2SAndrei Emeltchenko list_for_each_entry(chan, &conn->chan_l, list) { 65996be36555SAndrei Emeltchenko l2cap_chan_lock(chan); 66000a708f8fSGustavo F. Padovan 660189d8b407SAndrei Emeltchenko BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, 660289d8b407SAndrei Emeltchenko state_to_string(chan->state)); 6603f1cb9af5SVinicius Costa Gomes 660478eb2f98SAndrei Emeltchenko if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { 660578eb2f98SAndrei Emeltchenko l2cap_chan_unlock(chan); 660678eb2f98SAndrei Emeltchenko continue; 660778eb2f98SAndrei Emeltchenko } 660878eb2f98SAndrei Emeltchenko 6609073d1cf3SJohan Hedberg if (chan->scid == L2CAP_CID_ATT) { 6610f1cb9af5SVinicius Costa Gomes if (!status && encrypt) { 6611f1cb9af5SVinicius Costa Gomes chan->sec_level = hcon->sec_level; 6612cf4cd009SAndrei Emeltchenko l2cap_chan_ready(chan); 6613f1cb9af5SVinicius Costa Gomes } 6614f1cb9af5SVinicius Costa Gomes 66156be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 6616f1cb9af5SVinicius Costa Gomes continue; 6617f1cb9af5SVinicius Costa Gomes } 6618f1cb9af5SVinicius Costa Gomes 661996eff46eSAndrei Emeltchenko if (!__l2cap_no_conn_pending(chan)) { 66206be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 66210a708f8fSGustavo F. Padovan continue; 66220a708f8fSGustavo F. Padovan } 66230a708f8fSGustavo F. Padovan 662489bc500eSGustavo F. Padovan if (!status && (chan->state == BT_CONNECTED || 662589bc500eSGustavo F. Padovan chan->state == BT_CONFIG)) { 6626a7d7723aSGustavo Padovan struct sock *sk = chan->sk; 6627a7d7723aSGustavo Padovan 6628c5daa683SGustavo Padovan clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); 6629a7d7723aSGustavo Padovan sk->sk_state_change(sk); 6630a7d7723aSGustavo Padovan 66314343478fSGustavo F. Padovan l2cap_check_encryption(chan, encrypt); 66326be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 66330a708f8fSGustavo F. Padovan continue; 66340a708f8fSGustavo F. Padovan } 66350a708f8fSGustavo F. Padovan 663689bc500eSGustavo F. Padovan if (chan->state == BT_CONNECT) { 66370a708f8fSGustavo F. Padovan if (!status) { 663893c3e8f5SAndrei Emeltchenko l2cap_start_connection(chan); 66390a708f8fSGustavo F. Padovan } else { 6640ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 66410a708f8fSGustavo F. Padovan } 664289bc500eSGustavo F. Padovan } else if (chan->state == BT_CONNECT2) { 66436be36555SAndrei Emeltchenko struct sock *sk = chan->sk; 66440a708f8fSGustavo F. Padovan struct l2cap_conn_rsp rsp; 6645df3c3931SJohan Hedberg __u16 res, stat; 66460a708f8fSGustavo F. Padovan 66476be36555SAndrei Emeltchenko lock_sock(sk); 66486be36555SAndrei Emeltchenko 66490a708f8fSGustavo F. Padovan if (!status) { 6650c5daa683SGustavo Padovan if (test_bit(BT_SK_DEFER_SETUP, 6651c5daa683SGustavo Padovan &bt_sk(sk)->flags)) { 6652df3c3931SJohan Hedberg res = L2CAP_CR_PEND; 6653df3c3931SJohan Hedberg stat = L2CAP_CS_AUTHOR_PEND; 66542dc4e510SGustavo Padovan chan->ops->defer(chan); 6655df3c3931SJohan Hedberg } else { 66560e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_CONFIG); 6657df3c3931SJohan Hedberg res = L2CAP_CR_SUCCESS; 6658df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 6659df3c3931SJohan Hedberg } 66600a708f8fSGustavo F. Padovan } else { 66610e587be7SAndrei Emeltchenko __l2cap_state_change(chan, BT_DISCONN); 6662ba13ccd9SMarcel Holtmann __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); 6663df3c3931SJohan Hedberg res = L2CAP_CR_SEC_BLOCK; 6664df3c3931SJohan Hedberg stat = L2CAP_CS_NO_INFO; 66650a708f8fSGustavo F. Padovan } 66660a708f8fSGustavo F. Padovan 66676be36555SAndrei Emeltchenko release_sock(sk); 66686be36555SAndrei Emeltchenko 6669fe4128e0SGustavo F. Padovan rsp.scid = cpu_to_le16(chan->dcid); 6670fe4128e0SGustavo F. Padovan rsp.dcid = cpu_to_le16(chan->scid); 6671df3c3931SJohan Hedberg rsp.result = cpu_to_le16(res); 6672df3c3931SJohan Hedberg rsp.status = cpu_to_le16(stat); 6673fc7f8a7eSGustavo F. Padovan l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, 6674fc7f8a7eSGustavo F. Padovan sizeof(rsp), &rsp); 66752d369359SMat Martineau 66762d369359SMat Martineau if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && 66772d369359SMat Martineau res == L2CAP_CR_SUCCESS) { 66782d369359SMat Martineau char buf[128]; 66792d369359SMat Martineau set_bit(CONF_REQ_SENT, &chan->conf_state); 66802d369359SMat Martineau l2cap_send_cmd(conn, l2cap_get_ident(conn), 66812d369359SMat Martineau L2CAP_CONF_REQ, 66822d369359SMat Martineau l2cap_build_conf_req(chan, buf), 66832d369359SMat Martineau buf); 66842d369359SMat Martineau chan->num_conf_req++; 66852d369359SMat Martineau } 66860a708f8fSGustavo F. Padovan } 66870a708f8fSGustavo F. Padovan 66886be36555SAndrei Emeltchenko l2cap_chan_unlock(chan); 66890a708f8fSGustavo F. Padovan } 66900a708f8fSGustavo F. Padovan 66913df91ea2SAndrei Emeltchenko mutex_unlock(&conn->chan_lock); 66920a708f8fSGustavo F. Padovan 66930a708f8fSGustavo F. Padovan return 0; 66940a708f8fSGustavo F. Padovan } 66950a708f8fSGustavo F. Padovan 6696686ebf28SUlisses Furquim int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) 66970a708f8fSGustavo F. Padovan { 66980a708f8fSGustavo F. Padovan struct l2cap_conn *conn = hcon->l2cap_data; 6699d73a0988SAndrei Emeltchenko struct l2cap_hdr *hdr; 6700d73a0988SAndrei Emeltchenko int len; 67010a708f8fSGustavo F. Padovan 67021d13a254SAndrei Emeltchenko /* For AMP controller do not create l2cap conn */ 67031d13a254SAndrei Emeltchenko if (!conn && hcon->hdev->dev_type != HCI_BREDR) 67041d13a254SAndrei Emeltchenko goto drop; 67050a708f8fSGustavo F. Padovan 67060a708f8fSGustavo F. Padovan if (!conn) 6707baf43251SClaudio Takahasi conn = l2cap_conn_add(hcon); 67080a708f8fSGustavo F. Padovan 67090a708f8fSGustavo F. Padovan if (!conn) 67100a708f8fSGustavo F. Padovan goto drop; 67110a708f8fSGustavo F. Padovan 67120a708f8fSGustavo F. Padovan BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); 67130a708f8fSGustavo F. Padovan 6714d73a0988SAndrei Emeltchenko switch (flags) { 6715d73a0988SAndrei Emeltchenko case ACL_START: 6716d73a0988SAndrei Emeltchenko case ACL_START_NO_FLUSH: 6717d73a0988SAndrei Emeltchenko case ACL_COMPLETE: 67180a708f8fSGustavo F. Padovan if (conn->rx_len) { 67190a708f8fSGustavo F. Padovan BT_ERR("Unexpected start frame (len %d)", skb->len); 67200a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 67210a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 67220a708f8fSGustavo F. Padovan conn->rx_len = 0; 67230a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 67240a708f8fSGustavo F. Padovan } 67250a708f8fSGustavo F. Padovan 67260a708f8fSGustavo F. Padovan /* Start fragment always begin with Basic L2CAP header */ 67270a708f8fSGustavo F. Padovan if (skb->len < L2CAP_HDR_SIZE) { 67280a708f8fSGustavo F. Padovan BT_ERR("Frame is too short (len %d)", skb->len); 67290a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 67300a708f8fSGustavo F. Padovan goto drop; 67310a708f8fSGustavo F. Padovan } 67320a708f8fSGustavo F. Padovan 67330a708f8fSGustavo F. Padovan hdr = (struct l2cap_hdr *) skb->data; 67340a708f8fSGustavo F. Padovan len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; 67350a708f8fSGustavo F. Padovan 67360a708f8fSGustavo F. Padovan if (len == skb->len) { 67370a708f8fSGustavo F. Padovan /* Complete frame received */ 67380a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, skb); 67390a708f8fSGustavo F. Padovan return 0; 67400a708f8fSGustavo F. Padovan } 67410a708f8fSGustavo F. Padovan 67420a708f8fSGustavo F. Padovan BT_DBG("Start: total len %d, frag len %d", len, skb->len); 67430a708f8fSGustavo F. Padovan 67440a708f8fSGustavo F. Padovan if (skb->len > len) { 67450a708f8fSGustavo F. Padovan BT_ERR("Frame is too long (len %d, expected len %d)", 67460a708f8fSGustavo F. Padovan skb->len, len); 67470a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 67480a708f8fSGustavo F. Padovan goto drop; 67490a708f8fSGustavo F. Padovan } 67500a708f8fSGustavo F. Padovan 67510a708f8fSGustavo F. Padovan /* Allocate skb for the complete frame (with header) */ 67528bcde1f2SGustavo Padovan conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 67530a708f8fSGustavo F. Padovan if (!conn->rx_skb) 67540a708f8fSGustavo F. Padovan goto drop; 67550a708f8fSGustavo F. Padovan 67560a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 67570a708f8fSGustavo F. Padovan skb->len); 67580a708f8fSGustavo F. Padovan conn->rx_len = len - skb->len; 6759d73a0988SAndrei Emeltchenko break; 6760d73a0988SAndrei Emeltchenko 6761d73a0988SAndrei Emeltchenko case ACL_CONT: 67620a708f8fSGustavo F. Padovan BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); 67630a708f8fSGustavo F. Padovan 67640a708f8fSGustavo F. Padovan if (!conn->rx_len) { 67650a708f8fSGustavo F. Padovan BT_ERR("Unexpected continuation frame (len %d)", skb->len); 67660a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 67670a708f8fSGustavo F. Padovan goto drop; 67680a708f8fSGustavo F. Padovan } 67690a708f8fSGustavo F. Padovan 67700a708f8fSGustavo F. Padovan if (skb->len > conn->rx_len) { 67710a708f8fSGustavo F. Padovan BT_ERR("Fragment is too long (len %d, expected %d)", 67720a708f8fSGustavo F. Padovan skb->len, conn->rx_len); 67730a708f8fSGustavo F. Padovan kfree_skb(conn->rx_skb); 67740a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 67750a708f8fSGustavo F. Padovan conn->rx_len = 0; 67760a708f8fSGustavo F. Padovan l2cap_conn_unreliable(conn, ECOMM); 67770a708f8fSGustavo F. Padovan goto drop; 67780a708f8fSGustavo F. Padovan } 67790a708f8fSGustavo F. Padovan 67800a708f8fSGustavo F. Padovan skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 67810a708f8fSGustavo F. Padovan skb->len); 67820a708f8fSGustavo F. Padovan conn->rx_len -= skb->len; 67830a708f8fSGustavo F. Padovan 67840a708f8fSGustavo F. Padovan if (!conn->rx_len) { 67850a708f8fSGustavo F. Padovan /* Complete frame received */ 67860a708f8fSGustavo F. Padovan l2cap_recv_frame(conn, conn->rx_skb); 67870a708f8fSGustavo F. Padovan conn->rx_skb = NULL; 67880a708f8fSGustavo F. Padovan } 6789d73a0988SAndrei Emeltchenko break; 67900a708f8fSGustavo F. Padovan } 67910a708f8fSGustavo F. Padovan 67920a708f8fSGustavo F. Padovan drop: 67930a708f8fSGustavo F. Padovan kfree_skb(skb); 67940a708f8fSGustavo F. Padovan return 0; 67950a708f8fSGustavo F. Padovan } 67960a708f8fSGustavo F. Padovan 67970a708f8fSGustavo F. Padovan static int l2cap_debugfs_show(struct seq_file *f, void *p) 67980a708f8fSGustavo F. Padovan { 679923691d75SGustavo F. Padovan struct l2cap_chan *c; 68000a708f8fSGustavo F. Padovan 6801333055f2SGustavo F. Padovan read_lock(&chan_list_lock); 68020a708f8fSGustavo F. Padovan 680323691d75SGustavo F. Padovan list_for_each_entry(c, &chan_list, global_l) { 680423691d75SGustavo F. Padovan struct sock *sk = c->sk; 68050a708f8fSGustavo F. Padovan 6806fcb73338SAndrei Emeltchenko seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", 6807fcb73338SAndrei Emeltchenko &bt_sk(sk)->src, &bt_sk(sk)->dst, 680889bc500eSGustavo F. Padovan c->state, __le16_to_cpu(c->psm), 680923691d75SGustavo F. Padovan c->scid, c->dcid, c->imtu, c->omtu, 681023691d75SGustavo F. Padovan c->sec_level, c->mode); 68110a708f8fSGustavo F. Padovan } 68120a708f8fSGustavo F. Padovan 6813333055f2SGustavo F. Padovan read_unlock(&chan_list_lock); 68140a708f8fSGustavo F. Padovan 68150a708f8fSGustavo F. Padovan return 0; 68160a708f8fSGustavo F. Padovan } 68170a708f8fSGustavo F. Padovan 68180a708f8fSGustavo F. Padovan static int l2cap_debugfs_open(struct inode *inode, struct file *file) 68190a708f8fSGustavo F. Padovan { 68200a708f8fSGustavo F. Padovan return single_open(file, l2cap_debugfs_show, inode->i_private); 68210a708f8fSGustavo F. Padovan } 68220a708f8fSGustavo F. Padovan 68230a708f8fSGustavo F. Padovan static const struct file_operations l2cap_debugfs_fops = { 68240a708f8fSGustavo F. Padovan .open = l2cap_debugfs_open, 68250a708f8fSGustavo F. Padovan .read = seq_read, 68260a708f8fSGustavo F. Padovan .llseek = seq_lseek, 68270a708f8fSGustavo F. Padovan .release = single_release, 68280a708f8fSGustavo F. Padovan }; 68290a708f8fSGustavo F. Padovan 68300a708f8fSGustavo F. Padovan static struct dentry *l2cap_debugfs; 68310a708f8fSGustavo F. Padovan 683264274518SGustavo F. Padovan int __init l2cap_init(void) 68330a708f8fSGustavo F. Padovan { 68340a708f8fSGustavo F. Padovan int err; 68350a708f8fSGustavo F. Padovan 6836bb58f747SGustavo F. Padovan err = l2cap_init_sockets(); 68370a708f8fSGustavo F. Padovan if (err < 0) 68380a708f8fSGustavo F. Padovan return err; 68390a708f8fSGustavo F. Padovan 68400a708f8fSGustavo F. Padovan if (bt_debugfs) { 68412d792818SGustavo Padovan l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, 68422d792818SGustavo Padovan NULL, &l2cap_debugfs_fops); 68430a708f8fSGustavo F. Padovan if (!l2cap_debugfs) 68440a708f8fSGustavo F. Padovan BT_ERR("Failed to create L2CAP debug file"); 68450a708f8fSGustavo F. Padovan } 68460a708f8fSGustavo F. Padovan 68470a708f8fSGustavo F. Padovan return 0; 68480a708f8fSGustavo F. Padovan } 68490a708f8fSGustavo F. Padovan 685064274518SGustavo F. Padovan void l2cap_exit(void) 68510a708f8fSGustavo F. Padovan { 68520a708f8fSGustavo F. Padovan debugfs_remove(l2cap_debugfs); 6853bb58f747SGustavo F. Padovan l2cap_cleanup_sockets(); 68540a708f8fSGustavo F. Padovan } 68550a708f8fSGustavo F. Padovan 68560a708f8fSGustavo F. Padovan module_param(disable_ertm, bool, 0644); 68570a708f8fSGustavo F. Padovan MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); 6858