Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
57 | ||
bb58f747 | 58 | int disable_ertm; |
f0709e03 | 59 | |
47ec1dcd | 60 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 61 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 62 | |
1890d36b GP |
63 | static struct workqueue_struct *_busy_wq; |
64 | ||
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1890d36b GP |
68 | static void l2cap_busy_work(struct work_struct *work); |
69 | ||
1da177e4 LT |
70 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
71 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
72 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
73 | void *data); | |
710f9b0a | 74 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
75 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
76 | struct l2cap_chan *chan, int err); | |
1da177e4 | 77 | |
218bb9df GP |
78 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
79 | ||
0139418c | 80 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
81 | |
82 | static inline void chan_hold(struct l2cap_chan *c) | |
83 | { | |
84 | atomic_inc(&c->refcnt); | |
85 | } | |
86 | ||
87 | static inline void chan_put(struct l2cap_chan *c) | |
88 | { | |
89 | if (atomic_dec_and_test(&c->refcnt)) | |
90 | kfree(c); | |
91 | } | |
92 | ||
baa7e1fa | 93 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 94 | { |
48454079 | 95 | struct l2cap_chan *c; |
baa7e1fa GP |
96 | |
97 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 98 | if (c->dcid == cid) |
baa7e1fa | 99 | return c; |
0139418c | 100 | } |
baa7e1fa GP |
101 | return NULL; |
102 | ||
0139418c MH |
103 | } |
104 | ||
baa7e1fa | 105 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 106 | { |
48454079 | 107 | struct l2cap_chan *c; |
baa7e1fa GP |
108 | |
109 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 110 | if (c->scid == cid) |
baa7e1fa | 111 | return c; |
0139418c | 112 | } |
baa7e1fa | 113 | return NULL; |
0139418c MH |
114 | } |
115 | ||
116 | /* Find channel with given SCID. | |
117 | * Returns locked socket */ | |
baa7e1fa | 118 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 119 | { |
48454079 | 120 | struct l2cap_chan *c; |
baa7e1fa GP |
121 | |
122 | read_lock(&conn->chan_lock); | |
123 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
124 | if (c) |
125 | bh_lock_sock(c->sk); | |
baa7e1fa | 126 | read_unlock(&conn->chan_lock); |
48454079 | 127 | return c; |
0139418c MH |
128 | } |
129 | ||
baa7e1fa | 130 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 131 | { |
48454079 | 132 | struct l2cap_chan *c; |
baa7e1fa GP |
133 | |
134 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 135 | if (c->ident == ident) |
baa7e1fa | 136 | return c; |
0139418c | 137 | } |
baa7e1fa | 138 | return NULL; |
0139418c MH |
139 | } |
140 | ||
baa7e1fa | 141 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 142 | { |
48454079 | 143 | struct l2cap_chan *c; |
baa7e1fa GP |
144 | |
145 | read_lock(&conn->chan_lock); | |
146 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
147 | if (c) |
148 | bh_lock_sock(c->sk); | |
baa7e1fa | 149 | read_unlock(&conn->chan_lock); |
48454079 | 150 | return c; |
0139418c MH |
151 | } |
152 | ||
23691d75 | 153 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 154 | { |
23691d75 | 155 | struct l2cap_chan *c; |
9e4425ff | 156 | |
23691d75 GP |
157 | list_for_each_entry(c, &chan_list, global_l) { |
158 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
9e4425ff GP |
159 | goto found; |
160 | } | |
161 | ||
23691d75 | 162 | c = NULL; |
9e4425ff | 163 | found: |
23691d75 | 164 | return c; |
9e4425ff GP |
165 | } |
166 | ||
167 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
168 | { | |
73b2ec18 GP |
169 | int err; |
170 | ||
23691d75 | 171 | write_lock_bh(&chan_list_lock); |
9e4425ff | 172 | |
23691d75 | 173 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
174 | err = -EADDRINUSE; |
175 | goto done; | |
9e4425ff GP |
176 | } |
177 | ||
73b2ec18 GP |
178 | if (psm) { |
179 | chan->psm = psm; | |
180 | chan->sport = psm; | |
181 | err = 0; | |
182 | } else { | |
183 | u16 p; | |
184 | ||
185 | err = -EINVAL; | |
186 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 187 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
188 | chan->psm = cpu_to_le16(p); |
189 | chan->sport = cpu_to_le16(p); | |
190 | err = 0; | |
191 | break; | |
192 | } | |
193 | } | |
9e4425ff | 194 | |
73b2ec18 | 195 | done: |
23691d75 | 196 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 197 | return err; |
9e4425ff GP |
198 | } |
199 | ||
200 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
201 | { | |
23691d75 | 202 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
203 | |
204 | chan->scid = scid; | |
205 | ||
23691d75 | 206 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
207 | |
208 | return 0; | |
209 | } | |
210 | ||
baa7e1fa | 211 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 212 | { |
8db4dc46 | 213 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 214 | |
8db4dc46 | 215 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 216 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
217 | return cid; |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
c9b66675 | 223 | static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout) |
ab07801d | 224 | { |
89bc500e GP |
225 | BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout); |
226 | ||
c9b66675 | 227 | if (!mod_timer(timer, jiffies + timeout)) |
71ba0e56 | 228 | chan_hold(chan); |
ab07801d GP |
229 | } |
230 | ||
c9b66675 | 231 | static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer) |
ab07801d | 232 | { |
89bc500e | 233 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 234 | |
c9b66675 | 235 | if (timer_pending(timer) && del_timer(timer)) |
71ba0e56 | 236 | chan_put(chan); |
ab07801d GP |
237 | } |
238 | ||
89bc500e GP |
239 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
240 | { | |
241 | chan->state = state; | |
242 | chan->ops->state_change(chan->data, state); | |
243 | } | |
244 | ||
ab07801d GP |
245 | static void l2cap_chan_timeout(unsigned long arg) |
246 | { | |
247 | struct l2cap_chan *chan = (struct l2cap_chan *) arg; | |
248 | struct sock *sk = chan->sk; | |
249 | int reason; | |
250 | ||
89bc500e | 251 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d GP |
252 | |
253 | bh_lock_sock(sk); | |
254 | ||
255 | if (sock_owned_by_user(sk)) { | |
256 | /* sk is owned by user. Try again later */ | |
c9b66675 | 257 | __set_chan_timer(chan, HZ / 5); |
ab07801d | 258 | bh_unlock_sock(sk); |
71ba0e56 | 259 | chan_put(chan); |
ab07801d GP |
260 | return; |
261 | } | |
262 | ||
89bc500e | 263 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 264 | reason = ECONNREFUSED; |
89bc500e | 265 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
266 | chan->sec_level != BT_SECURITY_SDP) |
267 | reason = ECONNREFUSED; | |
268 | else | |
269 | reason = ETIMEDOUT; | |
270 | ||
0f852724 | 271 | l2cap_chan_close(chan, reason); |
ab07801d GP |
272 | |
273 | bh_unlock_sock(sk); | |
274 | ||
ba3bd0ee | 275 | chan->ops->close(chan->data); |
71ba0e56 | 276 | chan_put(chan); |
ab07801d GP |
277 | } |
278 | ||
23691d75 | 279 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
280 | { |
281 | struct l2cap_chan *chan; | |
282 | ||
283 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
284 | if (!chan) | |
285 | return NULL; | |
286 | ||
287 | chan->sk = sk; | |
288 | ||
23691d75 GP |
289 | write_lock_bh(&chan_list_lock); |
290 | list_add(&chan->global_l, &chan_list); | |
291 | write_unlock_bh(&chan_list_lock); | |
292 | ||
ab07801d GP |
293 | setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); |
294 | ||
89bc500e GP |
295 | chan->state = BT_OPEN; |
296 | ||
71ba0e56 GP |
297 | atomic_set(&chan->refcnt, 1); |
298 | ||
48454079 GP |
299 | return chan; |
300 | } | |
301 | ||
23691d75 | 302 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 303 | { |
23691d75 GP |
304 | write_lock_bh(&chan_list_lock); |
305 | list_del(&chan->global_l); | |
306 | write_unlock_bh(&chan_list_lock); | |
307 | ||
71ba0e56 | 308 | chan_put(chan); |
6ff5abbf GP |
309 | } |
310 | ||
48454079 | 311 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 312 | { |
af05b30b | 313 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 314 | chan->psm, chan->dcid); |
0139418c | 315 | |
2950f21a MH |
316 | conn->disc_reason = 0x13; |
317 | ||
8c1d787b | 318 | chan->conn = conn; |
0139418c | 319 | |
715ec005 | 320 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
321 | if (conn->hcon->type == LE_LINK) { |
322 | /* LE connection */ | |
0c1bc5c6 | 323 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
324 | chan->scid = L2CAP_CID_LE_DATA; |
325 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
326 | } else { |
327 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 328 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 329 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 330 | } |
715ec005 | 331 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 332 | /* Connectionless socket */ |
fe4128e0 GP |
333 | chan->scid = L2CAP_CID_CONN_LESS; |
334 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 335 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
336 | } else { |
337 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
338 | chan->scid = L2CAP_CID_SIGNALING; |
339 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 340 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
341 | } |
342 | ||
71ba0e56 | 343 | chan_hold(chan); |
baa7e1fa GP |
344 | |
345 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
346 | } |
347 | ||
8e87d142 | 348 | /* Delete channel. |
0139418c | 349 | * Must be called on the locked socket. */ |
4519de9a | 350 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 351 | { |
48454079 | 352 | struct sock *sk = chan->sk; |
8c1d787b | 353 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
354 | struct sock *parent = bt_sk(sk)->parent; |
355 | ||
c9b66675 | 356 | __clear_chan_timer(chan); |
0139418c | 357 | |
49208c9c | 358 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 359 | |
8e87d142 | 360 | if (conn) { |
baa7e1fa GP |
361 | /* Delete from channel list */ |
362 | write_lock_bh(&conn->chan_lock); | |
363 | list_del(&chan->list); | |
364 | write_unlock_bh(&conn->chan_lock); | |
71ba0e56 | 365 | chan_put(chan); |
baa7e1fa | 366 | |
8c1d787b | 367 | chan->conn = NULL; |
0139418c MH |
368 | hci_conn_put(conn->hcon); |
369 | } | |
370 | ||
89bc500e | 371 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
372 | sock_set_flag(sk, SOCK_ZAPPED); |
373 | ||
374 | if (err) | |
375 | sk->sk_err = err; | |
376 | ||
377 | if (parent) { | |
378 | bt_accept_unlink(sk); | |
379 | parent->sk_data_ready(parent, 0); | |
380 | } else | |
381 | sk->sk_state_change(sk); | |
c13ffa62 | 382 | |
b4450035 GP |
383 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && |
384 | chan->conf_state & L2CAP_CONF_INPUT_DONE)) | |
6ff5abbf | 385 | return; |
2ead70b8 | 386 | |
58d35f87 | 387 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 388 | |
0c1bc5c6 | 389 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
390 | struct srej_list *l, *tmp; |
391 | ||
1a09bcb9 GP |
392 | __clear_retrans_timer(chan); |
393 | __clear_monitor_timer(chan); | |
394 | __clear_ack_timer(chan); | |
c13ffa62 | 395 | |
f1c6775b GP |
396 | skb_queue_purge(&chan->srej_q); |
397 | skb_queue_purge(&chan->busy_q); | |
c13ffa62 | 398 | |
39d5a3ee | 399 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
400 | list_del(&l->list); |
401 | kfree(l); | |
402 | } | |
403 | } | |
0139418c MH |
404 | } |
405 | ||
4519de9a GP |
406 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
407 | { | |
408 | struct sock *sk; | |
409 | ||
410 | BT_DBG("parent %p", parent); | |
411 | ||
412 | /* Close not yet accepted channels */ | |
0f852724 | 413 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 414 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 415 | __clear_chan_timer(chan); |
0f852724 | 416 | lock_sock(sk); |
ba3bd0ee | 417 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 418 | release_sock(sk); |
ba3bd0ee | 419 | chan->ops->close(chan->data); |
0f852724 | 420 | } |
4519de9a GP |
421 | } |
422 | ||
0f852724 | 423 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
424 | { |
425 | struct l2cap_conn *conn = chan->conn; | |
426 | struct sock *sk = chan->sk; | |
427 | ||
89bc500e | 428 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 429 | |
89bc500e | 430 | switch (chan->state) { |
4519de9a GP |
431 | case BT_LISTEN: |
432 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
433 | |
434 | l2cap_state_change(chan, BT_CLOSED); | |
435 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
436 | break; |
437 | ||
438 | case BT_CONNECTED: | |
439 | case BT_CONFIG: | |
715ec005 | 440 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 441 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
442 | __clear_chan_timer(chan); |
443 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
444 | l2cap_send_disconn_req(conn, chan, reason); |
445 | } else | |
446 | l2cap_chan_del(chan, reason); | |
447 | break; | |
448 | ||
449 | case BT_CONNECT2: | |
715ec005 | 450 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
451 | conn->hcon->type == ACL_LINK) { |
452 | struct l2cap_conn_rsp rsp; | |
453 | __u16 result; | |
454 | ||
455 | if (bt_sk(sk)->defer_setup) | |
456 | result = L2CAP_CR_SEC_BLOCK; | |
457 | else | |
458 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 459 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
460 | |
461 | rsp.scid = cpu_to_le16(chan->dcid); | |
462 | rsp.dcid = cpu_to_le16(chan->scid); | |
463 | rsp.result = cpu_to_le16(result); | |
464 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
465 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
466 | sizeof(rsp), &rsp); | |
467 | } | |
468 | ||
469 | l2cap_chan_del(chan, reason); | |
470 | break; | |
471 | ||
472 | case BT_CONNECT: | |
473 | case BT_DISCONN: | |
474 | l2cap_chan_del(chan, reason); | |
475 | break; | |
476 | ||
477 | default: | |
478 | sock_set_flag(sk, SOCK_ZAPPED); | |
479 | break; | |
480 | } | |
481 | } | |
482 | ||
4343478f | 483 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 484 | { |
715ec005 | 485 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 486 | switch (chan->sec_level) { |
8556edd3 JH |
487 | case BT_SECURITY_HIGH: |
488 | return HCI_AT_DEDICATED_BONDING_MITM; | |
489 | case BT_SECURITY_MEDIUM: | |
490 | return HCI_AT_DEDICATED_BONDING; | |
491 | default: | |
492 | return HCI_AT_NO_BONDING; | |
493 | } | |
fe4128e0 | 494 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
495 | if (chan->sec_level == BT_SECURITY_LOW) |
496 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 497 | |
4343478f | 498 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 499 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 500 | else |
8556edd3 | 501 | return HCI_AT_NO_BONDING; |
00ae4af9 | 502 | } else { |
4343478f | 503 | switch (chan->sec_level) { |
00ae4af9 | 504 | case BT_SECURITY_HIGH: |
8556edd3 | 505 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 506 | case BT_SECURITY_MEDIUM: |
8556edd3 | 507 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 508 | default: |
8556edd3 | 509 | return HCI_AT_NO_BONDING; |
00ae4af9 | 510 | } |
0684e5f9 | 511 | } |
8556edd3 JH |
512 | } |
513 | ||
514 | /* Service level security */ | |
4343478f | 515 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 516 | { |
8c1d787b | 517 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
518 | __u8 auth_type; |
519 | ||
4343478f | 520 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 521 | |
4343478f | 522 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
523 | } |
524 | ||
b5ad8b7f | 525 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
526 | { |
527 | u8 id; | |
528 | ||
529 | /* Get next available identificator. | |
530 | * 1 - 128 are used by kernel. | |
531 | * 129 - 199 are reserved. | |
532 | * 200 - 254 are used by utilities like l2ping, etc. | |
533 | */ | |
534 | ||
535 | spin_lock_bh(&conn->lock); | |
536 | ||
537 | if (++conn->tx_ident > 128) | |
538 | conn->tx_ident = 1; | |
539 | ||
540 | id = conn->tx_ident; | |
541 | ||
542 | spin_unlock_bh(&conn->lock); | |
543 | ||
544 | return id; | |
545 | } | |
546 | ||
4519de9a | 547 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
548 | { |
549 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 550 | u8 flags; |
4e8402a3 MH |
551 | |
552 | BT_DBG("code 0x%2.2x", code); | |
553 | ||
554 | if (!skb) | |
9a9c6a34 | 555 | return; |
4e8402a3 | 556 | |
e702112f AE |
557 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
558 | flags = ACL_START_NO_FLUSH; | |
559 | else | |
560 | flags = ACL_START; | |
561 | ||
14b12d0b JG |
562 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
563 | ||
e702112f | 564 | hci_send_acl(conn->hcon, skb, flags); |
4e8402a3 MH |
565 | } |
566 | ||
525cd185 | 567 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
568 | { |
569 | struct sk_buff *skb; | |
570 | struct l2cap_hdr *lh; | |
8c1d787b | 571 | struct l2cap_conn *conn = chan->conn; |
fcc203c3 | 572 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 573 | u8 flags; |
fcc203c3 | 574 | |
89bc500e | 575 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
576 | return; |
577 | ||
47d1ec61 | 578 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 | 579 | hlen += 2; |
1c2acffb | 580 | |
49208c9c | 581 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 582 | |
fcc203c3 | 583 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
584 | control |= L2CAP_CTRL_FRAME_TYPE; |
585 | ||
525cd185 | 586 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
9e917af1 | 587 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 588 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
9e917af1 GP |
589 | } |
590 | ||
525cd185 | 591 | if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { |
f0946ccf | 592 | control |= L2CAP_CTRL_POLL; |
525cd185 | 593 | chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; |
f0946ccf GP |
594 | } |
595 | ||
1c2acffb GP |
596 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
597 | if (!skb) | |
9a9c6a34 | 598 | return; |
1c2acffb GP |
599 | |
600 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 601 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 602 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
603 | put_unaligned_le16(control, skb_put(skb, 2)); |
604 | ||
47d1ec61 | 605 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
606 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
607 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
608 | } | |
609 | ||
e702112f AE |
610 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
611 | flags = ACL_START_NO_FLUSH; | |
612 | else | |
613 | flags = ACL_START; | |
614 | ||
14b12d0b JG |
615 | bt_cb(skb)->force_active = chan->force_active; |
616 | ||
8c1d787b | 617 | hci_send_acl(chan->conn->hcon, skb, flags); |
1c2acffb GP |
618 | } |
619 | ||
525cd185 | 620 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 621 | { |
525cd185 | 622 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 623 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 624 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 625 | } else |
7e743090 GP |
626 | control |= L2CAP_SUPER_RCV_READY; |
627 | ||
42e5c802 | 628 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
2ab25cdd | 629 | |
525cd185 | 630 | l2cap_send_sframe(chan, control); |
7e743090 GP |
631 | } |
632 | ||
b4450035 | 633 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 634 | { |
b4450035 | 635 | return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); |
e501d055 AE |
636 | } |
637 | ||
fc7f8a7e | 638 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 639 | { |
8c1d787b | 640 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
641 | |
642 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
643 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
644 | return; | |
645 | ||
4343478f GP |
646 | if (l2cap_check_security(chan) && |
647 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 | 648 | struct l2cap_conn_req req; |
fe4128e0 GP |
649 | req.scid = cpu_to_le16(chan->scid); |
650 | req.psm = chan->psm; | |
79d554a6 | 651 | |
fc7f8a7e | 652 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 653 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 654 | |
fc7f8a7e GP |
655 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
656 | sizeof(req), &req); | |
b1235d79 | 657 | } |
79d554a6 MH |
658 | } else { |
659 | struct l2cap_info_req req; | |
660 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
661 | ||
662 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
663 | conn->info_ident = l2cap_get_ident(conn); | |
664 | ||
665 | mod_timer(&conn->info_timer, jiffies + | |
666 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
667 | ||
668 | l2cap_send_cmd(conn, conn->info_ident, | |
669 | L2CAP_INFO_REQ, sizeof(req), &req); | |
670 | } | |
671 | } | |
672 | ||
cf6c2c0b GP |
673 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
674 | { | |
675 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 676 | if (!disable_ertm) |
cf6c2c0b GP |
677 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
678 | ||
679 | switch (mode) { | |
680 | case L2CAP_MODE_ERTM: | |
681 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
682 | case L2CAP_MODE_STREAMING: | |
683 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
684 | default: | |
685 | return 0x00; | |
686 | } | |
687 | } | |
688 | ||
4519de9a | 689 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 690 | { |
e92c8e70 | 691 | struct sock *sk; |
22121fc9 GP |
692 | struct l2cap_disconn_req req; |
693 | ||
c13ffa62 GP |
694 | if (!conn) |
695 | return; | |
696 | ||
e92c8e70 GP |
697 | sk = chan->sk; |
698 | ||
0c1bc5c6 | 699 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
700 | __clear_retrans_timer(chan); |
701 | __clear_monitor_timer(chan); | |
702 | __clear_ack_timer(chan); | |
c13ffa62 GP |
703 | } |
704 | ||
fe4128e0 GP |
705 | req.dcid = cpu_to_le16(chan->dcid); |
706 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
707 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
708 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 709 | |
89bc500e | 710 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 711 | sk->sk_err = err; |
22121fc9 GP |
712 | } |
713 | ||
1da177e4 | 714 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
715 | static void l2cap_conn_start(struct l2cap_conn *conn) |
716 | { | |
820ffdb3 | 717 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
718 | |
719 | BT_DBG("conn %p", conn); | |
720 | ||
baa7e1fa | 721 | read_lock(&conn->chan_lock); |
4e8402a3 | 722 | |
820ffdb3 | 723 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 724 | struct sock *sk = chan->sk; |
baa7e1fa | 725 | |
4e8402a3 MH |
726 | bh_lock_sock(sk); |
727 | ||
715ec005 | 728 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
729 | bh_unlock_sock(sk); |
730 | continue; | |
731 | } | |
732 | ||
89bc500e | 733 | if (chan->state == BT_CONNECT) { |
47731de7 | 734 | struct l2cap_conn_req req; |
79d554a6 | 735 | |
4343478f | 736 | if (!l2cap_check_security(chan) || |
b4450035 | 737 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
738 | bh_unlock_sock(sk); |
739 | continue; | |
740 | } | |
79d554a6 | 741 | |
0c1bc5c6 | 742 | if (!l2cap_mode_supported(chan->mode, |
47731de7 | 743 | conn->feat_mask) |
b4450035 | 744 | && chan->conf_state & |
47731de7 | 745 | L2CAP_CONF_STATE2_DEVICE) { |
0f852724 | 746 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 GP |
747 | * so release the lock */ |
748 | read_unlock_bh(&conn->chan_lock); | |
89bc500e | 749 | l2cap_chan_close(chan, ECONNRESET); |
820ffdb3 | 750 | read_lock_bh(&conn->chan_lock); |
47731de7 GP |
751 | bh_unlock_sock(sk); |
752 | continue; | |
b1235d79 | 753 | } |
47731de7 | 754 | |
fe4128e0 GP |
755 | req.scid = cpu_to_le16(chan->scid); |
756 | req.psm = chan->psm; | |
47731de7 | 757 | |
fc7f8a7e | 758 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 759 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
47731de7 | 760 | |
fc7f8a7e GP |
761 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
762 | sizeof(req), &req); | |
47731de7 | 763 | |
89bc500e | 764 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 765 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 766 | char buf[128]; |
fe4128e0 GP |
767 | rsp.scid = cpu_to_le16(chan->dcid); |
768 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 769 | |
4343478f | 770 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
771 | if (bt_sk(sk)->defer_setup) { |
772 | struct sock *parent = bt_sk(sk)->parent; | |
773 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
774 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
775 | parent->sk_data_ready(parent, 0); | |
776 | ||
777 | } else { | |
89bc500e | 778 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
779 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
780 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
781 | } | |
79d554a6 MH |
782 | } else { |
783 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
784 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
785 | } | |
786 | ||
fc7f8a7e GP |
787 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
788 | sizeof(rsp), &rsp); | |
e9aeb2dd | 789 | |
b4450035 | 790 | if (chan->conf_state & L2CAP_CONF_REQ_SENT || |
e9aeb2dd GP |
791 | rsp.result != L2CAP_CR_SUCCESS) { |
792 | bh_unlock_sock(sk); | |
793 | continue; | |
794 | } | |
795 | ||
b4450035 | 796 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 797 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
798 | l2cap_build_conf_req(chan, buf), buf); |
799 | chan->num_conf_req++; | |
4e8402a3 MH |
800 | } |
801 | ||
802 | bh_unlock_sock(sk); | |
803 | } | |
804 | ||
baa7e1fa | 805 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
806 | } |
807 | ||
b62f328b VT |
808 | /* Find socket with cid and source bdaddr. |
809 | * Returns closest match, locked. | |
810 | */ | |
23691d75 | 811 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 812 | { |
23691d75 | 813 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 814 | |
23691d75 | 815 | read_lock(&chan_list_lock); |
b62f328b | 816 | |
23691d75 GP |
817 | list_for_each_entry(c, &chan_list, global_l) { |
818 | struct sock *sk = c->sk; | |
fe4128e0 | 819 | |
89bc500e | 820 | if (state && c->state != state) |
b62f328b VT |
821 | continue; |
822 | ||
23691d75 | 823 | if (c->scid == cid) { |
b62f328b | 824 | /* Exact match. */ |
23691d75 GP |
825 | if (!bacmp(&bt_sk(sk)->src, src)) { |
826 | read_unlock(&chan_list_lock); | |
827 | return c; | |
828 | } | |
b62f328b VT |
829 | |
830 | /* Closest match */ | |
831 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 832 | c1 = c; |
b62f328b VT |
833 | } |
834 | } | |
280f294f | 835 | |
23691d75 | 836 | read_unlock(&chan_list_lock); |
b62f328b | 837 | |
23691d75 | 838 | return c1; |
b62f328b VT |
839 | } |
840 | ||
841 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
842 | { | |
c916fbe4 | 843 | struct sock *parent, *sk; |
23691d75 | 844 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
845 | |
846 | BT_DBG(""); | |
847 | ||
848 | /* Check if we have socket listening on cid */ | |
23691d75 | 849 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 850 | conn->src); |
23691d75 | 851 | if (!pchan) |
b62f328b VT |
852 | return; |
853 | ||
23691d75 GP |
854 | parent = pchan->sk; |
855 | ||
62f3a2cf GP |
856 | bh_lock_sock(parent); |
857 | ||
b62f328b VT |
858 | /* Check for backlog size */ |
859 | if (sk_acceptq_is_full(parent)) { | |
860 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
861 | goto clean; | |
862 | } | |
863 | ||
80808e43 GP |
864 | chan = pchan->ops->new_connection(pchan->data); |
865 | if (!chan) | |
b62f328b VT |
866 | goto clean; |
867 | ||
80808e43 | 868 | sk = chan->sk; |
5d41ce1d | 869 | |
baa7e1fa | 870 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
871 | |
872 | hci_conn_hold(conn->hcon); | |
873 | ||
b62f328b VT |
874 | bacpy(&bt_sk(sk)->src, conn->src); |
875 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
876 | ||
d1010240 GP |
877 | bt_accept_enqueue(parent, sk); |
878 | ||
48454079 GP |
879 | __l2cap_chan_add(conn, chan); |
880 | ||
c9b66675 | 881 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 882 | |
89bc500e | 883 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
884 | parent->sk_data_ready(parent, 0); |
885 | ||
baa7e1fa | 886 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
887 | |
888 | clean: | |
889 | bh_unlock_sock(parent); | |
890 | } | |
891 | ||
4e8402a3 MH |
892 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
893 | { | |
48454079 | 894 | struct l2cap_chan *chan; |
4e8402a3 | 895 | |
79d554a6 | 896 | BT_DBG("conn %p", conn); |
4e8402a3 | 897 | |
b62f328b VT |
898 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
899 | l2cap_le_conn_ready(conn); | |
900 | ||
baa7e1fa | 901 | read_lock(&conn->chan_lock); |
4e8402a3 | 902 | |
baa7e1fa | 903 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 904 | struct sock *sk = chan->sk; |
baa7e1fa | 905 | |
79d554a6 | 906 | bh_lock_sock(sk); |
4e8402a3 | 907 | |
acd7d370 | 908 | if (conn->hcon->type == LE_LINK) { |
c9b66675 | 909 | __clear_chan_timer(chan); |
89bc500e | 910 | l2cap_state_change(chan, BT_CONNECTED); |
acd7d370 VT |
911 | sk->sk_state_change(sk); |
912 | } | |
913 | ||
715ec005 | 914 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 915 | __clear_chan_timer(chan); |
89bc500e | 916 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 917 | sk->sk_state_change(sk); |
89bc500e | 918 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 919 | l2cap_do_start(chan); |
4e8402a3 | 920 | |
79d554a6 | 921 | bh_unlock_sock(sk); |
4e8402a3 | 922 | } |
79d554a6 | 923 | |
baa7e1fa | 924 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
925 | } |
926 | ||
927 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
928 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
929 | { | |
48454079 | 930 | struct l2cap_chan *chan; |
4e8402a3 MH |
931 | |
932 | BT_DBG("conn %p", conn); | |
933 | ||
baa7e1fa | 934 | read_lock(&conn->chan_lock); |
4e8402a3 | 935 | |
baa7e1fa | 936 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 937 | struct sock *sk = chan->sk; |
baa7e1fa | 938 | |
4343478f | 939 | if (chan->force_reliable) |
4e8402a3 MH |
940 | sk->sk_err = err; |
941 | } | |
942 | ||
baa7e1fa | 943 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
944 | } |
945 | ||
946 | static void l2cap_info_timeout(unsigned long arg) | |
947 | { | |
948 | struct l2cap_conn *conn = (void *) arg; | |
949 | ||
984947dc | 950 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 951 | conn->info_ident = 0; |
984947dc | 952 | |
4e8402a3 MH |
953 | l2cap_conn_start(conn); |
954 | } | |
955 | ||
1da177e4 LT |
956 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
957 | { | |
0139418c | 958 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 959 | |
0139418c | 960 | if (conn || status) |
1da177e4 LT |
961 | return conn; |
962 | ||
0139418c MH |
963 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
964 | if (!conn) | |
1da177e4 | 965 | return NULL; |
1da177e4 LT |
966 | |
967 | hcon->l2cap_data = conn; | |
968 | conn->hcon = hcon; | |
969 | ||
0139418c MH |
970 | BT_DBG("hcon %p conn %p", hcon, conn); |
971 | ||
acd7d370 VT |
972 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
973 | conn->mtu = hcon->hdev->le_mtu; | |
974 | else | |
975 | conn->mtu = hcon->hdev->acl_mtu; | |
976 | ||
1da177e4 LT |
977 | conn->src = &hcon->hdev->bdaddr; |
978 | conn->dst = &hcon->dst; | |
979 | ||
4e8402a3 MH |
980 | conn->feat_mask = 0; |
981 | ||
1da177e4 | 982 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
983 | rwlock_init(&conn->chan_lock); |
984 | ||
985 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 986 | |
b62f328b VT |
987 | if (hcon->type != LE_LINK) |
988 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
989 | (unsigned long) conn); |
990 | ||
2950f21a MH |
991 | conn->disc_reason = 0x13; |
992 | ||
1da177e4 LT |
993 | return conn; |
994 | } | |
995 | ||
0139418c | 996 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 997 | { |
0139418c | 998 | struct l2cap_conn *conn = hcon->l2cap_data; |
baa7e1fa | 999 | struct l2cap_chan *chan, *l; |
1da177e4 LT |
1000 | struct sock *sk; |
1001 | ||
0139418c MH |
1002 | if (!conn) |
1003 | return; | |
1da177e4 LT |
1004 | |
1005 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1006 | ||
7585b97a | 1007 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
1008 | |
1009 | /* Kill channels */ | |
baa7e1fa | 1010 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
48454079 | 1011 | sk = chan->sk; |
1da177e4 | 1012 | bh_lock_sock(sk); |
48454079 | 1013 | l2cap_chan_del(chan, err); |
1da177e4 | 1014 | bh_unlock_sock(sk); |
ba3bd0ee | 1015 | chan->ops->close(chan->data); |
1da177e4 LT |
1016 | } |
1017 | ||
8e8440f5 DY |
1018 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
1019 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 1020 | |
1da177e4 LT |
1021 | hcon->l2cap_data = NULL; |
1022 | kfree(conn); | |
1da177e4 LT |
1023 | } |
1024 | ||
48454079 | 1025 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1026 | { |
baa7e1fa | 1027 | write_lock_bh(&conn->chan_lock); |
48454079 | 1028 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1029 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1030 | } |
1031 | ||
1da177e4 | 1032 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1033 | |
1034 | /* Find socket with psm and source bdaddr. | |
1035 | * Returns closest match. | |
1036 | */ | |
23691d75 | 1037 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1038 | { |
23691d75 | 1039 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1040 | |
23691d75 | 1041 | read_lock(&chan_list_lock); |
e0f0cb56 | 1042 | |
23691d75 GP |
1043 | list_for_each_entry(c, &chan_list, global_l) { |
1044 | struct sock *sk = c->sk; | |
fe4128e0 | 1045 | |
89bc500e | 1046 | if (state && c->state != state) |
1da177e4 LT |
1047 | continue; |
1048 | ||
23691d75 | 1049 | if (c->psm == psm) { |
1da177e4 | 1050 | /* Exact match. */ |
23691d75 | 1051 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1052 | read_unlock(&chan_list_lock); |
23691d75 GP |
1053 | return c; |
1054 | } | |
1da177e4 LT |
1055 | |
1056 | /* Closest match */ | |
1057 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1058 | c1 = c; |
1da177e4 LT |
1059 | } |
1060 | } | |
1da177e4 | 1061 | |
23691d75 | 1062 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1063 | |
23691d75 | 1064 | return c1; |
1da177e4 LT |
1065 | } |
1066 | ||
77a74c7e | 1067 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1068 | { |
5d41ce1d | 1069 | struct sock *sk = chan->sk; |
1da177e4 LT |
1070 | bdaddr_t *src = &bt_sk(sk)->src; |
1071 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1072 | struct l2cap_conn *conn; | |
1073 | struct hci_conn *hcon; | |
1074 | struct hci_dev *hdev; | |
09ab6f4c | 1075 | __u8 auth_type; |
44d0e48e | 1076 | int err; |
1da177e4 | 1077 | |
f29972de | 1078 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1079 | chan->psm); |
1da177e4 | 1080 | |
af05b30b GP |
1081 | hdev = hci_get_route(dst, src); |
1082 | if (!hdev) | |
1da177e4 LT |
1083 | return -EHOSTUNREACH; |
1084 | ||
1085 | hci_dev_lock_bh(hdev); | |
1086 | ||
4343478f | 1087 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1088 | |
fe4128e0 | 1089 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1090 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1091 | chan->sec_level, auth_type); |
acd7d370 VT |
1092 | else |
1093 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1094 | chan->sec_level, auth_type); |
acd7d370 | 1095 | |
30e76272 VT |
1096 | if (IS_ERR(hcon)) { |
1097 | err = PTR_ERR(hcon); | |
1da177e4 | 1098 | goto done; |
30e76272 | 1099 | } |
1da177e4 LT |
1100 | |
1101 | conn = l2cap_conn_add(hcon, 0); | |
1102 | if (!conn) { | |
1103 | hci_conn_put(hcon); | |
30e76272 | 1104 | err = -ENOMEM; |
1da177e4 LT |
1105 | goto done; |
1106 | } | |
1107 | ||
1da177e4 LT |
1108 | /* Update source addr of the socket */ |
1109 | bacpy(src, conn->src); | |
1110 | ||
48454079 GP |
1111 | l2cap_chan_add(conn, chan); |
1112 | ||
89bc500e | 1113 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1114 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1115 | |
1116 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1117 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1118 | __clear_chan_timer(chan); |
4343478f | 1119 | if (l2cap_check_security(chan)) |
89bc500e | 1120 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1121 | } else |
fc7f8a7e | 1122 | l2cap_do_start(chan); |
1da177e4 LT |
1123 | } |
1124 | ||
30e76272 VT |
1125 | err = 0; |
1126 | ||
1da177e4 LT |
1127 | done: |
1128 | hci_dev_unlock_bh(hdev); | |
1129 | hci_dev_put(hdev); | |
1130 | return err; | |
1131 | } | |
1132 | ||
dcba0dba | 1133 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1134 | { |
8c1d787b | 1135 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1136 | DECLARE_WAITQUEUE(wait, current); |
1137 | int err = 0; | |
1138 | int timeo = HZ/5; | |
1139 | ||
2b0b05dd | 1140 | add_wait_queue(sk_sleep(sk), &wait); |
8c1d787b | 1141 | while ((chan->unacked_frames > 0 && chan->conn)) { |
6161c038 GP |
1142 | set_current_state(TASK_INTERRUPTIBLE); |
1143 | ||
1144 | if (!timeo) | |
1145 | timeo = HZ/5; | |
1146 | ||
1147 | if (signal_pending(current)) { | |
1148 | err = sock_intr_errno(timeo); | |
1149 | break; | |
1150 | } | |
1151 | ||
1152 | release_sock(sk); | |
1153 | timeo = schedule_timeout(timeo); | |
1154 | lock_sock(sk); | |
1155 | ||
1156 | err = sock_error(sk); | |
1157 | if (err) | |
1158 | break; | |
1159 | } | |
1160 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1161 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1162 | return err; |
1163 | } | |
1164 | ||
e90bac06 GP |
1165 | static void l2cap_monitor_timeout(unsigned long arg) |
1166 | { | |
525cd185 GP |
1167 | struct l2cap_chan *chan = (void *) arg; |
1168 | struct sock *sk = chan->sk; | |
e90bac06 | 1169 | |
525cd185 | 1170 | BT_DBG("chan %p", chan); |
0e98958d | 1171 | |
e686219a | 1172 | bh_lock_sock(sk); |
2c03a7a4 | 1173 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1174 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1175 | bh_unlock_sock(sk); |
e90bac06 GP |
1176 | return; |
1177 | } | |
1178 | ||
6a026610 | 1179 | chan->retry_count++; |
1a09bcb9 | 1180 | __set_monitor_timer(chan); |
e90bac06 | 1181 | |
525cd185 | 1182 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1183 | bh_unlock_sock(sk); |
e90bac06 GP |
1184 | } |
1185 | ||
1186 | static void l2cap_retrans_timeout(unsigned long arg) | |
1187 | { | |
525cd185 GP |
1188 | struct l2cap_chan *chan = (void *) arg; |
1189 | struct sock *sk = chan->sk; | |
e90bac06 | 1190 | |
49208c9c | 1191 | BT_DBG("chan %p", chan); |
0e98958d | 1192 | |
e686219a | 1193 | bh_lock_sock(sk); |
6a026610 | 1194 | chan->retry_count = 1; |
1a09bcb9 | 1195 | __set_monitor_timer(chan); |
e90bac06 | 1196 | |
525cd185 | 1197 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
e90bac06 | 1198 | |
525cd185 | 1199 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1200 | bh_unlock_sock(sk); |
e90bac06 GP |
1201 | } |
1202 | ||
42e5c802 | 1203 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1204 | { |
1c2acffb | 1205 | struct sk_buff *skb; |
1da177e4 | 1206 | |
58d35f87 | 1207 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1208 | chan->unacked_frames) { |
42e5c802 | 1209 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1210 | break; |
1da177e4 | 1211 | |
58d35f87 | 1212 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1213 | kfree_skb(skb); |
1da177e4 | 1214 | |
6a026610 | 1215 | chan->unacked_frames--; |
1c2acffb | 1216 | } |
1da177e4 | 1217 | |
6a026610 | 1218 | if (!chan->unacked_frames) |
1a09bcb9 | 1219 | __clear_retrans_timer(chan); |
1c2acffb | 1220 | } |
1da177e4 | 1221 | |
4343478f | 1222 | void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1223 | { |
8c1d787b | 1224 | struct hci_conn *hcon = chan->conn->hcon; |
e702112f | 1225 | u16 flags; |
1c2acffb | 1226 | |
4343478f | 1227 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1228 | |
4343478f | 1229 | if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) |
e702112f AE |
1230 | flags = ACL_START_NO_FLUSH; |
1231 | else | |
1232 | flags = ACL_START; | |
1233 | ||
14b12d0b | 1234 | bt_cb(skb)->force_active = chan->force_active; |
e702112f | 1235 | hci_send_acl(hcon, skb, flags); |
1c2acffb GP |
1236 | } |
1237 | ||
42e5c802 | 1238 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1239 | { |
ccbb84af | 1240 | struct sk_buff *skb; |
fcc203c3 | 1241 | u16 control, fcs; |
6840ed07 | 1242 | |
58d35f87 | 1243 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1244 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1245 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1246 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1247 | |
47d1ec61 | 1248 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1249 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1250 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1251 | } |
1252 | ||
4343478f | 1253 | l2cap_do_send(chan, skb); |
6840ed07 | 1254 | |
42e5c802 | 1255 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1256 | } |
6840ed07 GP |
1257 | } |
1258 | ||
525cd185 | 1259 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1260 | { |
8f17154f GP |
1261 | struct sk_buff *skb, *tx_skb; |
1262 | u16 control, fcs; | |
8f17154f | 1263 | |
58d35f87 | 1264 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1265 | if (!skb) |
1266 | return; | |
8f17154f | 1267 | |
f11d676d GP |
1268 | do { |
1269 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1270 | break; |
8f17154f | 1271 | |
58d35f87 | 1272 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1273 | return; |
8f17154f | 1274 | |
58d35f87 | 1275 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1276 | |
2c03a7a4 GP |
1277 | if (chan->remote_max_tx && |
1278 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1279 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1280 | return; |
1281 | } | |
1282 | ||
1283 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1284 | bt_cb(skb)->retries++; | |
1285 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1286 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1287 | |
525cd185 | 1288 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
3cb123d1 | 1289 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1290 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 1291 | } |
95ffa978 | 1292 | |
42e5c802 | 1293 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1294 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1295 | |
f11d676d GP |
1296 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1297 | ||
47d1ec61 | 1298 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1299 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1300 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1301 | } | |
1302 | ||
4343478f | 1303 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1304 | } |
1305 | ||
525cd185 | 1306 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1307 | { |
1308 | struct sk_buff *skb, *tx_skb; | |
fcc203c3 | 1309 | u16 control, fcs; |
9a9c6a34 | 1310 | int nsent = 0; |
1c2acffb | 1311 | |
89bc500e | 1312 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1313 | return -ENOTCONN; |
e90bac06 | 1314 | |
58d35f87 | 1315 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1316 | |
2c03a7a4 GP |
1317 | if (chan->remote_max_tx && |
1318 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1319 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1320 | break; |
1321 | } | |
1322 | ||
e420aba3 AE |
1323 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1324 | ||
e90bac06 GP |
1325 | bt_cb(skb)->retries++; |
1326 | ||
1c2acffb | 1327 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1328 | control &= L2CAP_CTRL_SAR; |
1329 | ||
525cd185 | 1330 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
d5392c8f | 1331 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1332 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
d5392c8f | 1333 | } |
42e5c802 GP |
1334 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1335 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1336 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1337 | ||
e90bac06 | 1338 | |
47d1ec61 | 1339 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1340 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1341 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1342 | } | |
1343 | ||
4343478f | 1344 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1345 | |
1a09bcb9 | 1346 | __set_retrans_timer(chan); |
1c2acffb | 1347 | |
42e5c802 GP |
1348 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1349 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1350 | |
23e9fde2 | 1351 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1352 | chan->unacked_frames++; |
23e9fde2 | 1353 | |
6a026610 | 1354 | chan->frames_sent++; |
1c2acffb | 1355 | |
58d35f87 GP |
1356 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1357 | chan->tx_send_head = NULL; | |
1c2acffb | 1358 | else |
58d35f87 | 1359 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1360 | |
1361 | nsent++; | |
1c2acffb GP |
1362 | } |
1363 | ||
9e917af1 GP |
1364 | return nsent; |
1365 | } | |
1366 | ||
525cd185 | 1367 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1368 | { |
dfc909be GP |
1369 | int ret; |
1370 | ||
58d35f87 GP |
1371 | if (!skb_queue_empty(&chan->tx_q)) |
1372 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1373 | |
42e5c802 | 1374 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1375 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1376 | return ret; |
1377 | } | |
1378 | ||
525cd185 | 1379 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1380 | { |
9e917af1 GP |
1381 | u16 control = 0; |
1382 | ||
42e5c802 | 1383 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1384 | |
525cd185 | 1385 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
9e917af1 | 1386 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
1387 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1388 | l2cap_send_sframe(chan, control); | |
9a9c6a34 | 1389 | return; |
9e917af1 | 1390 | } |
dfc909be | 1391 | |
525cd185 | 1392 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1393 | return; |
1394 | ||
1395 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1396 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1397 | } |
1398 | ||
525cd185 | 1399 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1400 | { |
1401 | struct srej_list *tail; | |
1402 | u16 control; | |
1403 | ||
1404 | control = L2CAP_SUPER_SELECT_REJECT; | |
1405 | control |= L2CAP_CTRL_FINAL; | |
1406 | ||
39d5a3ee | 1407 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1408 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1409 | ||
525cd185 | 1410 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1411 | } |
1412 | ||
1c2acffb GP |
1413 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1414 | { | |
8c1d787b | 1415 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1416 | struct sk_buff **frag; |
1417 | int err, sent = 0; | |
1da177e4 | 1418 | |
59203a21 | 1419 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1420 | return -EFAULT; |
1da177e4 LT |
1421 | |
1422 | sent += count; | |
1423 | len -= count; | |
1424 | ||
1425 | /* Continuation fragments (no L2CAP header) */ | |
1426 | frag = &skb_shinfo(skb)->frag_list; | |
1427 | while (len) { | |
1428 | count = min_t(unsigned int, conn->mtu, len); | |
1429 | ||
1430 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1431 | if (!*frag) | |
0175d629 | 1432 | return err; |
1c2acffb GP |
1433 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1434 | return -EFAULT; | |
1da177e4 LT |
1435 | |
1436 | sent += count; | |
1437 | len -= count; | |
1438 | ||
1439 | frag = &(*frag)->next; | |
1440 | } | |
1da177e4 LT |
1441 | |
1442 | return sent; | |
1c2acffb | 1443 | } |
1da177e4 | 1444 | |
fe4128e0 | 1445 | struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1446 | { |
fe4128e0 | 1447 | struct sock *sk = chan->sk; |
8c1d787b | 1448 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1449 | struct sk_buff *skb; |
1450 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1451 | struct l2cap_hdr *lh; | |
1452 | ||
1453 | BT_DBG("sk %p len %d", sk, (int)len); | |
1454 | ||
1455 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1456 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1457 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1458 | if (!skb) | |
0175d629 | 1459 | return ERR_PTR(err); |
1c2acffb GP |
1460 | |
1461 | /* Create L2CAP header */ | |
1462 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1463 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1464 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1465 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1466 | |
1467 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1468 | if (unlikely(err < 0)) { | |
1469 | kfree_skb(skb); | |
1470 | return ERR_PTR(err); | |
1471 | } | |
1472 | return skb; | |
1473 | } | |
1474 | ||
fe4128e0 | 1475 | struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1476 | { |
fe4128e0 | 1477 | struct sock *sk = chan->sk; |
8c1d787b | 1478 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1479 | struct sk_buff *skb; |
1480 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1481 | struct l2cap_hdr *lh; | |
1482 | ||
1483 | BT_DBG("sk %p len %d", sk, (int)len); | |
1484 | ||
1485 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1486 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1487 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1488 | if (!skb) | |
0175d629 | 1489 | return ERR_PTR(err); |
1c2acffb GP |
1490 | |
1491 | /* Create L2CAP header */ | |
1492 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1493 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1494 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1495 | ||
1496 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1497 | if (unlikely(err < 0)) { | |
1498 | kfree_skb(skb); | |
1499 | return ERR_PTR(err); | |
1500 | } | |
1501 | return skb; | |
1502 | } | |
1503 | ||
47d1ec61 | 1504 | struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb | 1505 | { |
47d1ec61 | 1506 | struct sock *sk = chan->sk; |
8c1d787b | 1507 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1508 | struct sk_buff *skb; |
1509 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1510 | struct l2cap_hdr *lh; | |
1511 | ||
1512 | BT_DBG("sk %p len %d", sk, (int)len); | |
1513 | ||
0ee0d208 GP |
1514 | if (!conn) |
1515 | return ERR_PTR(-ENOTCONN); | |
1516 | ||
c74e560c GP |
1517 | if (sdulen) |
1518 | hlen += 2; | |
1519 | ||
47d1ec61 | 1520 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1521 | hlen += 2; |
1522 | ||
1c2acffb GP |
1523 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1524 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1525 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1526 | if (!skb) | |
0175d629 | 1527 | return ERR_PTR(err); |
1c2acffb GP |
1528 | |
1529 | /* Create L2CAP header */ | |
1530 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1531 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1532 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1533 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1534 | if (sdulen) |
1535 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1536 | |
1537 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1538 | if (unlikely(err < 0)) { | |
1539 | kfree_skb(skb); | |
1540 | return ERR_PTR(err); | |
1541 | } | |
e90bac06 | 1542 | |
47d1ec61 | 1543 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1544 | put_unaligned_le16(0, skb_put(skb, 2)); |
1545 | ||
e90bac06 | 1546 | bt_cb(skb)->retries = 0; |
1c2acffb | 1547 | return skb; |
1da177e4 LT |
1548 | } |
1549 | ||
2c03a7a4 | 1550 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1551 | { |
c74e560c GP |
1552 | struct sk_buff *skb; |
1553 | struct sk_buff_head sar_queue; | |
1554 | u16 control; | |
1555 | size_t size = 0; | |
1556 | ||
ff12fd64 | 1557 | skb_queue_head_init(&sar_queue); |
c74e560c | 1558 | control = L2CAP_SDU_START; |
47d1ec61 | 1559 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1560 | if (IS_ERR(skb)) |
1561 | return PTR_ERR(skb); | |
1562 | ||
1563 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1564 | len -= chan->remote_mps; |
1565 | size += chan->remote_mps; | |
c74e560c GP |
1566 | |
1567 | while (len > 0) { | |
1568 | size_t buflen; | |
1569 | ||
2c03a7a4 | 1570 | if (len > chan->remote_mps) { |
44651b85 | 1571 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1572 | buflen = chan->remote_mps; |
c74e560c | 1573 | } else { |
44651b85 | 1574 | control = L2CAP_SDU_END; |
c74e560c GP |
1575 | buflen = len; |
1576 | } | |
1577 | ||
47d1ec61 | 1578 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1579 | if (IS_ERR(skb)) { |
1580 | skb_queue_purge(&sar_queue); | |
1581 | return PTR_ERR(skb); | |
1582 | } | |
1583 | ||
1584 | __skb_queue_tail(&sar_queue, skb); | |
1585 | len -= buflen; | |
1586 | size += buflen; | |
c74e560c | 1587 | } |
58d35f87 GP |
1588 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1589 | if (chan->tx_send_head == NULL) | |
1590 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1591 | |
1592 | return size; | |
1593 | } | |
1594 | ||
9a91a04a GP |
1595 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1596 | { | |
9a91a04a GP |
1597 | struct sk_buff *skb; |
1598 | u16 control; | |
1599 | int err; | |
1600 | ||
1601 | /* Connectionless channel */ | |
715ec005 | 1602 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
9a91a04a GP |
1603 | skb = l2cap_create_connless_pdu(chan, msg, len); |
1604 | if (IS_ERR(skb)) | |
1605 | return PTR_ERR(skb); | |
1606 | ||
1607 | l2cap_do_send(chan, skb); | |
1608 | return len; | |
1609 | } | |
1610 | ||
1611 | switch (chan->mode) { | |
1612 | case L2CAP_MODE_BASIC: | |
1613 | /* Check outgoing MTU */ | |
1614 | if (len > chan->omtu) | |
1615 | return -EMSGSIZE; | |
1616 | ||
1617 | /* Create a basic PDU */ | |
1618 | skb = l2cap_create_basic_pdu(chan, msg, len); | |
1619 | if (IS_ERR(skb)) | |
1620 | return PTR_ERR(skb); | |
1621 | ||
1622 | l2cap_do_send(chan, skb); | |
1623 | err = len; | |
1624 | break; | |
1625 | ||
1626 | case L2CAP_MODE_ERTM: | |
1627 | case L2CAP_MODE_STREAMING: | |
1628 | /* Entire SDU fits into one PDU */ | |
1629 | if (len <= chan->remote_mps) { | |
1630 | control = L2CAP_SDU_UNSEGMENTED; | |
1631 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, | |
1632 | 0); | |
1633 | if (IS_ERR(skb)) | |
1634 | return PTR_ERR(skb); | |
1635 | ||
1636 | __skb_queue_tail(&chan->tx_q, skb); | |
1637 | ||
1638 | if (chan->tx_send_head == NULL) | |
1639 | chan->tx_send_head = skb; | |
1640 | ||
1641 | } else { | |
1642 | /* Segment SDU into multiples PDUs */ | |
1643 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1644 | if (err < 0) | |
1645 | return err; | |
1646 | } | |
1647 | ||
1648 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1649 | l2cap_streaming_send(chan); | |
1650 | err = len; | |
1651 | break; | |
1652 | } | |
1653 | ||
1654 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
1655 | (chan->conn_state & L2CAP_CONN_WAIT_F)) { | |
1656 | err = len; | |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | err = l2cap_ertm_send(chan); | |
1661 | if (err >= 0) | |
1662 | err = len; | |
1663 | ||
1664 | break; | |
1665 | ||
1666 | default: | |
1667 | BT_DBG("bad state %1.1x", chan->mode); | |
1668 | err = -EBADFD; | |
1669 | } | |
1670 | ||
1671 | return err; | |
1672 | } | |
1673 | ||
1da177e4 LT |
1674 | static void l2cap_chan_ready(struct sock *sk) |
1675 | { | |
1676 | struct sock *parent = bt_sk(sk)->parent; | |
b4450035 | 1677 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1da177e4 LT |
1678 | |
1679 | BT_DBG("sk %p, parent %p", sk, parent); | |
1680 | ||
b4450035 | 1681 | chan->conf_state = 0; |
c9b66675 | 1682 | __clear_chan_timer(chan); |
1da177e4 LT |
1683 | |
1684 | if (!parent) { | |
1685 | /* Outgoing channel. | |
1686 | * Wake up socket sleeping on connect. | |
1687 | */ | |
89bc500e | 1688 | l2cap_state_change(chan, BT_CONNECTED); |
1da177e4 LT |
1689 | sk->sk_state_change(sk); |
1690 | } else { | |
1691 | /* Incoming channel. | |
1692 | * Wake up socket sleeping on accept. | |
1693 | */ | |
1694 | parent->sk_data_ready(parent, 0); | |
1695 | } | |
1696 | } | |
1697 | ||
1698 | /* Copy frame to all raw sockets on that connection */ | |
1699 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1700 | { | |
1da177e4 | 1701 | struct sk_buff *nskb; |
48454079 | 1702 | struct l2cap_chan *chan; |
1da177e4 LT |
1703 | |
1704 | BT_DBG("conn %p", conn); | |
1705 | ||
baa7e1fa GP |
1706 | read_lock(&conn->chan_lock); |
1707 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1708 | struct sock *sk = chan->sk; |
715ec005 | 1709 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1710 | continue; |
1711 | ||
1712 | /* Don't send frame to the socket it came from */ | |
1713 | if (skb->sk == sk) | |
1714 | continue; | |
af05b30b GP |
1715 | nskb = skb_clone(skb, GFP_ATOMIC); |
1716 | if (!nskb) | |
1da177e4 LT |
1717 | continue; |
1718 | ||
23070494 | 1719 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1720 | kfree_skb(nskb); |
1721 | } | |
baa7e1fa | 1722 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1723 | } |
1724 | ||
1725 | /* ---- L2CAP signalling commands ---- */ | |
1726 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1727 | u8 code, u8 ident, u16 dlen, void *data) | |
1728 | { | |
1729 | struct sk_buff *skb, **frag; | |
1730 | struct l2cap_cmd_hdr *cmd; | |
1731 | struct l2cap_hdr *lh; | |
1732 | int len, count; | |
1733 | ||
af05b30b GP |
1734 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1735 | conn, code, ident, dlen); | |
1da177e4 LT |
1736 | |
1737 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1738 | count = min_t(unsigned int, conn->mtu, len); | |
1739 | ||
1740 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1741 | if (!skb) | |
1742 | return NULL; | |
1743 | ||
1744 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1745 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1746 | |
1747 | if (conn->hcon->type == LE_LINK) | |
1748 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1749 | else | |
1750 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1751 | |
1752 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1753 | cmd->code = code; | |
1754 | cmd->ident = ident; | |
aca3192c | 1755 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1756 | |
1757 | if (dlen) { | |
1758 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1759 | memcpy(skb_put(skb, count), data, count); | |
1760 | data += count; | |
1761 | } | |
1762 | ||
1763 | len -= skb->len; | |
1764 | ||
1765 | /* Continuation fragments (no L2CAP header) */ | |
1766 | frag = &skb_shinfo(skb)->frag_list; | |
1767 | while (len) { | |
1768 | count = min_t(unsigned int, conn->mtu, len); | |
1769 | ||
1770 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1771 | if (!*frag) | |
1772 | goto fail; | |
1773 | ||
1774 | memcpy(skb_put(*frag, count), data, count); | |
1775 | ||
1776 | len -= count; | |
1777 | data += count; | |
1778 | ||
1779 | frag = &(*frag)->next; | |
1780 | } | |
1781 | ||
1782 | return skb; | |
1783 | ||
1784 | fail: | |
1785 | kfree_skb(skb); | |
1786 | return NULL; | |
1787 | } | |
1788 | ||
1789 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1790 | { | |
1791 | struct l2cap_conf_opt *opt = *ptr; | |
1792 | int len; | |
1793 | ||
1794 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1795 | *ptr += len; | |
1796 | ||
1797 | *type = opt->type; | |
1798 | *olen = opt->len; | |
1799 | ||
1800 | switch (opt->len) { | |
1801 | case 1: | |
1802 | *val = *((u8 *) opt->val); | |
1803 | break; | |
1804 | ||
1805 | case 2: | |
bfaaeb3e | 1806 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1807 | break; |
1808 | ||
1809 | case 4: | |
bfaaeb3e | 1810 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1811 | break; |
1812 | ||
1813 | default: | |
1814 | *val = (unsigned long) opt->val; | |
1815 | break; | |
1816 | } | |
1817 | ||
1818 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1819 | return len; | |
1820 | } | |
1821 | ||
1da177e4 LT |
1822 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1823 | { | |
1824 | struct l2cap_conf_opt *opt = *ptr; | |
1825 | ||
1826 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1827 | ||
1828 | opt->type = type; | |
1829 | opt->len = len; | |
1830 | ||
1831 | switch (len) { | |
1832 | case 1: | |
1833 | *((u8 *) opt->val) = val; | |
1834 | break; | |
1835 | ||
1836 | case 2: | |
4f8b691c | 1837 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1838 | break; |
1839 | ||
1840 | case 4: | |
4f8b691c | 1841 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1842 | break; |
1843 | ||
1844 | default: | |
1845 | memcpy(opt->val, (void *) val, len); | |
1846 | break; | |
1847 | } | |
1848 | ||
1849 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1850 | } | |
1851 | ||
c1b4f43b GP |
1852 | static void l2cap_ack_timeout(unsigned long arg) |
1853 | { | |
525cd185 | 1854 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1855 | |
525cd185 GP |
1856 | bh_lock_sock(chan->sk); |
1857 | l2cap_send_ack(chan); | |
1858 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1859 | } |
1860 | ||
525cd185 | 1861 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1862 | { |
525cd185 GP |
1863 | struct sock *sk = chan->sk; |
1864 | ||
42e5c802 | 1865 | chan->expected_ack_seq = 0; |
6a026610 | 1866 | chan->unacked_frames = 0; |
42e5c802 | 1867 | chan->buffer_seq = 0; |
6a026610 GP |
1868 | chan->num_acked = 0; |
1869 | chan->frames_sent = 0; | |
0565c1c2 | 1870 | |
e92c8e70 GP |
1871 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1872 | (unsigned long) chan); | |
1873 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1874 | (unsigned long) chan); | |
1875 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1876 | |
f1c6775b GP |
1877 | skb_queue_head_init(&chan->srej_q); |
1878 | skb_queue_head_init(&chan->busy_q); | |
1890d36b | 1879 | |
39d5a3ee GP |
1880 | INIT_LIST_HEAD(&chan->srej_l); |
1881 | ||
311bb895 | 1882 | INIT_WORK(&chan->busy_work, l2cap_busy_work); |
218bb9df GP |
1883 | |
1884 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1885 | } |
1886 | ||
f2fcfcd6 GP |
1887 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1888 | { | |
1889 | switch (mode) { | |
1890 | case L2CAP_MODE_STREAMING: | |
1891 | case L2CAP_MODE_ERTM: | |
1892 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1893 | return mode; | |
1894 | /* fall through */ | |
1895 | default: | |
1896 | return L2CAP_MODE_BASIC; | |
1897 | } | |
1898 | } | |
1899 | ||
710f9b0a | 1900 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1901 | { |
1da177e4 | 1902 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1903 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1904 | void *ptr = req->data; |
1905 | ||
49208c9c | 1906 | BT_DBG("chan %p", chan); |
1da177e4 | 1907 | |
73ffa904 | 1908 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1909 | goto done; |
1910 | ||
0c1bc5c6 | 1911 | switch (chan->mode) { |
f2fcfcd6 GP |
1912 | case L2CAP_MODE_STREAMING: |
1913 | case L2CAP_MODE_ERTM: | |
b4450035 | 1914 | if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1915 | break; |
85eb53c6 | 1916 | |
2ba13ed6 | 1917 | /* fall through */ |
f2fcfcd6 | 1918 | default: |
8c1d787b | 1919 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
1920 | break; |
1921 | } | |
1922 | ||
1923 | done: | |
0c1bc5c6 GP |
1924 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1925 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1926 | |
0c1bc5c6 | 1927 | switch (chan->mode) { |
65c7c491 | 1928 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
1929 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1930 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
1931 | break; |
1932 | ||
62547752 GP |
1933 | rfc.mode = L2CAP_MODE_BASIC; |
1934 | rfc.txwin_size = 0; | |
1935 | rfc.max_transmit = 0; | |
1936 | rfc.retrans_timeout = 0; | |
1937 | rfc.monitor_timeout = 0; | |
1938 | rfc.max_pdu_size = 0; | |
1939 | ||
63406504 GP |
1940 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1941 | (unsigned long) &rfc); | |
65c7c491 MH |
1942 | break; |
1943 | ||
1944 | case L2CAP_MODE_ERTM: | |
1945 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 GP |
1946 | rfc.txwin_size = chan->tx_win; |
1947 | rfc.max_transmit = chan->max_tx; | |
f2fcfcd6 GP |
1948 | rfc.retrans_timeout = 0; |
1949 | rfc.monitor_timeout = 0; | |
c74e560c | 1950 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1951 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1952 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
f2fcfcd6 | 1953 | |
63406504 GP |
1954 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1955 | (unsigned long) &rfc); | |
1956 | ||
8c1d787b | 1957 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1958 | break; |
1959 | ||
47d1ec61 | 1960 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1961 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1962 | chan->fcs = L2CAP_FCS_NONE; |
1963 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1964 | } |
f2fcfcd6 GP |
1965 | break; |
1966 | ||
1967 | case L2CAP_MODE_STREAMING: | |
1968 | rfc.mode = L2CAP_MODE_STREAMING; | |
1969 | rfc.txwin_size = 0; | |
1970 | rfc.max_transmit = 0; | |
1971 | rfc.retrans_timeout = 0; | |
1972 | rfc.monitor_timeout = 0; | |
c74e560c | 1973 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1974 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1975 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
65c7c491 | 1976 | |
63406504 GP |
1977 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1978 | (unsigned long) &rfc); | |
1979 | ||
8c1d787b | 1980 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1981 | break; |
1982 | ||
47d1ec61 | 1983 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1984 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1985 | chan->fcs = L2CAP_FCS_NONE; |
1986 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1987 | } |
65c7c491 MH |
1988 | break; |
1989 | } | |
1da177e4 | 1990 | |
fe4128e0 | 1991 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 1992 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
1993 | |
1994 | return ptr - data; | |
1995 | } | |
1996 | ||
73ffa904 | 1997 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1998 | { |
5dee9e7c MH |
1999 | struct l2cap_conf_rsp *rsp = data; |
2000 | void *ptr = rsp->data; | |
73ffa904 GP |
2001 | void *req = chan->conf_req; |
2002 | int len = chan->conf_len; | |
5dee9e7c MH |
2003 | int type, hint, olen; |
2004 | unsigned long val; | |
6464f35f | 2005 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2006 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2007 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2008 | |
73ffa904 | 2009 | BT_DBG("chan %p", chan); |
820ae1b8 | 2010 | |
5dee9e7c MH |
2011 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2012 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2013 | |
589d2746 | 2014 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2015 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2016 | |
2017 | switch (type) { | |
2018 | case L2CAP_CONF_MTU: | |
861d6882 | 2019 | mtu = val; |
5dee9e7c MH |
2020 | break; |
2021 | ||
2022 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2023 | chan->flush_to = val; |
5dee9e7c MH |
2024 | break; |
2025 | ||
2026 | case L2CAP_CONF_QOS: | |
2027 | break; | |
2028 | ||
6464f35f MH |
2029 | case L2CAP_CONF_RFC: |
2030 | if (olen == sizeof(rfc)) | |
2031 | memcpy(&rfc, (void *) val, olen); | |
2032 | break; | |
2033 | ||
fcc203c3 GP |
2034 | case L2CAP_CONF_FCS: |
2035 | if (val == L2CAP_FCS_NONE) | |
b4450035 | 2036 | chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; |
fcc203c3 GP |
2037 | |
2038 | break; | |
2039 | ||
5dee9e7c MH |
2040 | default: |
2041 | if (hint) | |
2042 | break; | |
2043 | ||
2044 | result = L2CAP_CONF_UNKNOWN; | |
2045 | *((u8 *) ptr++) = type; | |
2046 | break; | |
2047 | } | |
2048 | } | |
2049 | ||
73ffa904 | 2050 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2051 | goto done; |
2052 | ||
0c1bc5c6 | 2053 | switch (chan->mode) { |
f2fcfcd6 GP |
2054 | case L2CAP_MODE_STREAMING: |
2055 | case L2CAP_MODE_ERTM: | |
b4450035 | 2056 | if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
0c1bc5c6 | 2057 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2058 | chan->conn->feat_mask); |
85eb53c6 GP |
2059 | break; |
2060 | } | |
2061 | ||
0c1bc5c6 | 2062 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2063 | return -ECONNREFUSED; |
742e519b | 2064 | |
f2fcfcd6 | 2065 | break; |
f2fcfcd6 GP |
2066 | } |
2067 | ||
2068 | done: | |
0c1bc5c6 | 2069 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2070 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2071 | rfc.mode = chan->mode; |
f2fcfcd6 | 2072 | |
73ffa904 | 2073 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2074 | return -ECONNREFUSED; |
2075 | ||
2076 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2077 | sizeof(rfc), (unsigned long) &rfc); | |
2078 | } | |
2079 | ||
2080 | ||
5dee9e7c MH |
2081 | if (result == L2CAP_CONF_SUCCESS) { |
2082 | /* Configure output options and let the other side know | |
2083 | * which ones we don't like. */ | |
2084 | ||
f2fcfcd6 GP |
2085 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2086 | result = L2CAP_CONF_UNACCEPT; | |
2087 | else { | |
0c1bc5c6 | 2088 | chan->omtu = mtu; |
b4450035 | 2089 | chan->conf_state |= L2CAP_CONF_MTU_DONE; |
f2fcfcd6 | 2090 | } |
0c1bc5c6 | 2091 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2092 | |
f2fcfcd6 GP |
2093 | switch (rfc.mode) { |
2094 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2095 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 2096 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
f2fcfcd6 GP |
2097 | break; |
2098 | ||
2099 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
2100 | chan->remote_tx_win = rfc.txwin_size; |
2101 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 | 2102 | |
8c1d787b GP |
2103 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2104 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2105 | |
2c03a7a4 | 2106 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2107 | |
10467e9e GP |
2108 | rfc.retrans_timeout = |
2109 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2110 | rfc.monitor_timeout = | |
2111 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2112 | |
b4450035 | 2113 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
2114 | |
2115 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2116 | sizeof(rfc), (unsigned long) &rfc); | |
2117 | ||
f2fcfcd6 GP |
2118 | break; |
2119 | ||
2120 | case L2CAP_MODE_STREAMING: | |
8c1d787b GP |
2121 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2122 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2123 | |
2c03a7a4 | 2124 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2125 | |
b4450035 | 2126 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
2127 | |
2128 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2129 | sizeof(rfc), (unsigned long) &rfc); | |
2130 | ||
f2fcfcd6 GP |
2131 | break; |
2132 | ||
2133 | default: | |
5dee9e7c | 2134 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2135 | |
6464f35f | 2136 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2137 | rfc.mode = chan->mode; |
f2fcfcd6 | 2138 | } |
6464f35f | 2139 | |
f2fcfcd6 | 2140 | if (result == L2CAP_CONF_SUCCESS) |
b4450035 | 2141 | chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; |
f2fcfcd6 | 2142 | } |
fe4128e0 | 2143 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2144 | rsp->result = cpu_to_le16(result); |
2145 | rsp->flags = cpu_to_le16(0x0000); | |
2146 | ||
2147 | return ptr - data; | |
1da177e4 LT |
2148 | } |
2149 | ||
b4450035 | 2150 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2151 | { |
f2fcfcd6 GP |
2152 | struct l2cap_conf_req *req = data; |
2153 | void *ptr = req->data; | |
2154 | int type, olen; | |
2155 | unsigned long val; | |
2156 | struct l2cap_conf_rfc rfc; | |
2157 | ||
fe4128e0 | 2158 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2159 | |
2160 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2161 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2162 | ||
2163 | switch (type) { | |
2164 | case L2CAP_CONF_MTU: | |
2165 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2166 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2167 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2168 | } else |
0c1bc5c6 GP |
2169 | chan->imtu = val; |
2170 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2171 | break; |
2172 | ||
2173 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2174 | chan->flush_to = val; |
f2fcfcd6 | 2175 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2176 | 2, chan->flush_to); |
f2fcfcd6 GP |
2177 | break; |
2178 | ||
2179 | case L2CAP_CONF_RFC: | |
2180 | if (olen == sizeof(rfc)) | |
2181 | memcpy(&rfc, (void *)val, olen); | |
2182 | ||
b4450035 | 2183 | if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && |
0c1bc5c6 | 2184 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2185 | return -ECONNREFUSED; |
2186 | ||
47d1ec61 | 2187 | chan->fcs = 0; |
f2fcfcd6 GP |
2188 | |
2189 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2190 | sizeof(rfc), (unsigned long) &rfc); | |
2191 | break; | |
2192 | } | |
2193 | } | |
2194 | ||
0c1bc5c6 | 2195 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2196 | return -ECONNREFUSED; |
2197 | ||
0c1bc5c6 | 2198 | chan->mode = rfc.mode; |
6c2ea7a8 | 2199 | |
f2fcfcd6 GP |
2200 | if (*result == L2CAP_CONF_SUCCESS) { |
2201 | switch (rfc.mode) { | |
2202 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2203 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2204 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2205 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2206 | break; |
2207 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2208 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2209 | } |
2210 | } | |
2211 | ||
fe4128e0 | 2212 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2213 | req->flags = cpu_to_le16(0x0000); |
2214 | ||
2215 | return ptr - data; | |
2216 | } | |
2217 | ||
fe4128e0 | 2218 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2219 | { |
2220 | struct l2cap_conf_rsp *rsp = data; | |
2221 | void *ptr = rsp->data; | |
1da177e4 | 2222 | |
fe4128e0 | 2223 | BT_DBG("chan %p", chan); |
1da177e4 | 2224 | |
fe4128e0 | 2225 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2226 | rsp->result = cpu_to_le16(result); |
aca3192c | 2227 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2228 | |
2229 | return ptr - data; | |
2230 | } | |
2231 | ||
8c1d787b | 2232 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2233 | { |
2234 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2235 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2236 | u8 buf[128]; |
2237 | ||
fe4128e0 GP |
2238 | rsp.scid = cpu_to_le16(chan->dcid); |
2239 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2240 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2241 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2242 | l2cap_send_cmd(conn, chan->ident, | |
2243 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2244 | ||
b4450035 | 2245 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
710f9b0a GP |
2246 | return; |
2247 | ||
b4450035 | 2248 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
710f9b0a GP |
2249 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2250 | l2cap_build_conf_req(chan, buf), buf); | |
2251 | chan->num_conf_req++; | |
2252 | } | |
2253 | ||
47d1ec61 | 2254 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2255 | { |
7b1c0049 GP |
2256 | int type, olen; |
2257 | unsigned long val; | |
2258 | struct l2cap_conf_rfc rfc; | |
2259 | ||
47d1ec61 | 2260 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2261 | |
0c1bc5c6 | 2262 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2263 | return; |
2264 | ||
2265 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2266 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2267 | ||
2268 | switch (type) { | |
2269 | case L2CAP_CONF_RFC: | |
2270 | if (olen == sizeof(rfc)) | |
2271 | memcpy(&rfc, (void *)val, olen); | |
2272 | goto done; | |
2273 | } | |
2274 | } | |
2275 | ||
2276 | done: | |
2277 | switch (rfc.mode) { | |
2278 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2279 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2280 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2281 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2282 | break; |
2283 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2284 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2285 | } |
2286 | } | |
2287 | ||
4e8402a3 MH |
2288 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2289 | { | |
2290 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2291 | ||
2292 | if (rej->reason != 0x0000) | |
2293 | return 0; | |
2294 | ||
2295 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2296 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2297 | del_timer(&conn->info_timer); |
984947dc MH |
2298 | |
2299 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2300 | conn->info_ident = 0; |
984947dc | 2301 | |
4e8402a3 MH |
2302 | l2cap_conn_start(conn); |
2303 | } | |
2304 | ||
2305 | return 0; | |
2306 | } | |
2307 | ||
1da177e4 LT |
2308 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2309 | { | |
1da177e4 LT |
2310 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2311 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2312 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2313 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2314 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2315 | |
2316 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2317 | __le16 psm = req->psm; |
1da177e4 LT |
2318 | |
2319 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2320 | ||
2321 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2322 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2323 | if (!pchan) { | |
1da177e4 LT |
2324 | result = L2CAP_CR_BAD_PSM; |
2325 | goto sendresp; | |
2326 | } | |
2327 | ||
23691d75 GP |
2328 | parent = pchan->sk; |
2329 | ||
e0f0cb56 GP |
2330 | bh_lock_sock(parent); |
2331 | ||
e7c29cb1 MH |
2332 | /* Check if the ACL is secure enough (if not SDP) */ |
2333 | if (psm != cpu_to_le16(0x0001) && | |
2334 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2335 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2336 | result = L2CAP_CR_SEC_BLOCK; |
2337 | goto response; | |
2338 | } | |
2339 | ||
1da177e4 LT |
2340 | result = L2CAP_CR_NO_MEM; |
2341 | ||
2342 | /* Check for backlog size */ | |
2343 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2344 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2345 | goto response; |
2346 | } | |
2347 | ||
80808e43 GP |
2348 | chan = pchan->ops->new_connection(pchan->data); |
2349 | if (!chan) | |
1da177e4 LT |
2350 | goto response; |
2351 | ||
80808e43 GP |
2352 | sk = chan->sk; |
2353 | ||
baa7e1fa | 2354 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2355 | |
2356 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2357 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2358 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2359 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2360 | chan->ops->close(chan->data); |
1da177e4 LT |
2361 | goto response; |
2362 | } | |
2363 | ||
2364 | hci_conn_hold(conn->hcon); | |
2365 | ||
1da177e4 LT |
2366 | bacpy(&bt_sk(sk)->src, conn->src); |
2367 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2368 | chan->psm = psm; |
2369 | chan->dcid = scid; | |
1da177e4 | 2370 | |
d1010240 GP |
2371 | bt_accept_enqueue(parent, sk); |
2372 | ||
48454079 GP |
2373 | __l2cap_chan_add(conn, chan); |
2374 | ||
fe4128e0 | 2375 | dcid = chan->scid; |
1da177e4 | 2376 | |
c9b66675 | 2377 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2378 | |
fc7f8a7e | 2379 | chan->ident = cmd->ident; |
1da177e4 | 2380 | |
984947dc | 2381 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2382 | if (l2cap_check_security(chan)) { |
f66dc81f | 2383 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2384 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2385 | result = L2CAP_CR_PEND; |
2386 | status = L2CAP_CS_AUTHOR_PEND; | |
2387 | parent->sk_data_ready(parent, 0); | |
2388 | } else { | |
89bc500e | 2389 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2390 | result = L2CAP_CR_SUCCESS; |
2391 | status = L2CAP_CS_NO_INFO; | |
2392 | } | |
79d554a6 | 2393 | } else { |
89bc500e | 2394 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2395 | result = L2CAP_CR_PEND; |
2396 | status = L2CAP_CS_AUTHEN_PEND; | |
2397 | } | |
2398 | } else { | |
89bc500e | 2399 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2400 | result = L2CAP_CR_PEND; |
2401 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2402 | } |
2403 | ||
baa7e1fa | 2404 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2405 | |
2406 | response: | |
2407 | bh_unlock_sock(parent); | |
2408 | ||
2409 | sendresp: | |
aca3192c YH |
2410 | rsp.scid = cpu_to_le16(scid); |
2411 | rsp.dcid = cpu_to_le16(dcid); | |
2412 | rsp.result = cpu_to_le16(result); | |
2413 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2414 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2415 | |
2416 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2417 | struct l2cap_info_req info; | |
2418 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2419 | ||
2420 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2421 | conn->info_ident = l2cap_get_ident(conn); | |
2422 | ||
2423 | mod_timer(&conn->info_timer, jiffies + | |
2424 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2425 | ||
2426 | l2cap_send_cmd(conn, conn->info_ident, | |
2427 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2428 | } | |
2429 | ||
b4450035 | 2430 | if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2431 | result == L2CAP_CR_SUCCESS) { |
2432 | u8 buf[128]; | |
b4450035 | 2433 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2434 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2435 | l2cap_build_conf_req(chan, buf), buf); |
2436 | chan->num_conf_req++; | |
e9aeb2dd GP |
2437 | } |
2438 | ||
1da177e4 LT |
2439 | return 0; |
2440 | } | |
2441 | ||
2442 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2443 | { | |
2444 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2445 | u16 scid, dcid, result, status; | |
48454079 | 2446 | struct l2cap_chan *chan; |
1da177e4 LT |
2447 | struct sock *sk; |
2448 | u8 req[128]; | |
2449 | ||
2450 | scid = __le16_to_cpu(rsp->scid); | |
2451 | dcid = __le16_to_cpu(rsp->dcid); | |
2452 | result = __le16_to_cpu(rsp->result); | |
2453 | status = __le16_to_cpu(rsp->status); | |
2454 | ||
2455 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2456 | ||
2457 | if (scid) { | |
baa7e1fa | 2458 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2459 | if (!chan) |
57d3b22b | 2460 | return -EFAULT; |
1da177e4 | 2461 | } else { |
baa7e1fa | 2462 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2463 | if (!chan) |
57d3b22b | 2464 | return -EFAULT; |
1da177e4 LT |
2465 | } |
2466 | ||
48454079 GP |
2467 | sk = chan->sk; |
2468 | ||
1da177e4 LT |
2469 | switch (result) { |
2470 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2471 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2472 | chan->ident = 0; |
fe4128e0 | 2473 | chan->dcid = dcid; |
b4450035 | 2474 | chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
6a8d3010 | 2475 | |
b4450035 | 2476 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
e9aeb2dd GP |
2477 | break; |
2478 | ||
b4450035 | 2479 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2480 | |
1da177e4 | 2481 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2482 | l2cap_build_conf_req(chan, req), req); |
2483 | chan->num_conf_req++; | |
1da177e4 LT |
2484 | break; |
2485 | ||
2486 | case L2CAP_CR_PEND: | |
b4450035 | 2487 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2488 | break; |
2489 | ||
2490 | default: | |
a49184c2 AE |
2491 | /* don't delete l2cap channel if sk is owned by user */ |
2492 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2493 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2494 | __clear_chan_timer(chan); |
2495 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2496 | break; |
2497 | } | |
2498 | ||
48454079 | 2499 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2500 | break; |
2501 | } | |
2502 | ||
2503 | bh_unlock_sock(sk); | |
2504 | return 0; | |
2505 | } | |
2506 | ||
47d1ec61 | 2507 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 | 2508 | { |
47d1ec61 GP |
2509 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
2510 | ||
8c462b60 MM |
2511 | /* FCS is enabled only in ERTM or streaming mode, if one or both |
2512 | * sides request it. | |
2513 | */ | |
0c1bc5c6 | 2514 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2515 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 2516 | else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) |
47d1ec61 | 2517 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2518 | } |
2519 | ||
88219a0f | 2520 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2521 | { |
2522 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2523 | u16 dcid, flags; | |
2524 | u8 rsp[64]; | |
48454079 | 2525 | struct l2cap_chan *chan; |
1da177e4 | 2526 | struct sock *sk; |
5dee9e7c | 2527 | int len; |
1da177e4 LT |
2528 | |
2529 | dcid = __le16_to_cpu(req->dcid); | |
2530 | flags = __le16_to_cpu(req->flags); | |
2531 | ||
2532 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2533 | ||
baa7e1fa | 2534 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2535 | if (!chan) |
1da177e4 LT |
2536 | return -ENOENT; |
2537 | ||
48454079 GP |
2538 | sk = chan->sk; |
2539 | ||
89bc500e | 2540 | if (chan->state != BT_CONFIG) { |
df6bd743 GP |
2541 | struct l2cap_cmd_rej rej; |
2542 | ||
2543 | rej.reason = cpu_to_le16(0x0002); | |
2544 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2545 | sizeof(rej), &rej); | |
354f60a9 | 2546 | goto unlock; |
df6bd743 | 2547 | } |
354f60a9 | 2548 | |
5dee9e7c | 2549 | /* Reject if config buffer is too small. */ |
88219a0f | 2550 | len = cmd_len - sizeof(*req); |
73ffa904 | 2551 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2552 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2553 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2554 | L2CAP_CONF_REJECT, flags), rsp); |
2555 | goto unlock; | |
2556 | } | |
2557 | ||
2558 | /* Store config. */ | |
73ffa904 GP |
2559 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2560 | chan->conf_len += len; | |
1da177e4 LT |
2561 | |
2562 | if (flags & 0x0001) { | |
2563 | /* Incomplete config. Send empty response. */ | |
2564 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2565 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2566 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2567 | goto unlock; |
2568 | } | |
2569 | ||
2570 | /* Complete config. */ | |
73ffa904 | 2571 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2572 | if (len < 0) { |
e92c8e70 | 2573 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2574 | goto unlock; |
f2fcfcd6 | 2575 | } |
1da177e4 | 2576 | |
5dee9e7c | 2577 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2578 | chan->num_conf_rsp++; |
5dee9e7c | 2579 | |
5dee9e7c | 2580 | /* Reset config buffer. */ |
73ffa904 | 2581 | chan->conf_len = 0; |
5dee9e7c | 2582 | |
b4450035 | 2583 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
876d9484 MH |
2584 | goto unlock; |
2585 | ||
b4450035 | 2586 | if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { |
47d1ec61 | 2587 | set_default_fcs(chan); |
fcc203c3 | 2588 | |
89bc500e | 2589 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2590 | |
42e5c802 GP |
2591 | chan->next_tx_seq = 0; |
2592 | chan->expected_tx_seq = 0; | |
58d35f87 | 2593 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2594 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2595 | l2cap_ertm_init(chan); |
0565c1c2 | 2596 | |
1da177e4 | 2597 | l2cap_chan_ready(sk); |
876d9484 MH |
2598 | goto unlock; |
2599 | } | |
2600 | ||
b4450035 | 2601 | if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { |
79d554a6 | 2602 | u8 buf[64]; |
b4450035 | 2603 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2604 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2605 | l2cap_build_conf_req(chan, buf), buf); |
2606 | chan->num_conf_req++; | |
1da177e4 LT |
2607 | } |
2608 | ||
2609 | unlock: | |
2610 | bh_unlock_sock(sk); | |
2611 | return 0; | |
2612 | } | |
2613 | ||
2614 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2615 | { | |
2616 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2617 | u16 scid, flags, result; | |
48454079 | 2618 | struct l2cap_chan *chan; |
1da177e4 | 2619 | struct sock *sk; |
7b1c0049 | 2620 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2621 | |
2622 | scid = __le16_to_cpu(rsp->scid); | |
2623 | flags = __le16_to_cpu(rsp->flags); | |
2624 | result = __le16_to_cpu(rsp->result); | |
2625 | ||
af05b30b GP |
2626 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2627 | scid, flags, result); | |
1da177e4 | 2628 | |
baa7e1fa | 2629 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2630 | if (!chan) |
1da177e4 LT |
2631 | return 0; |
2632 | ||
48454079 GP |
2633 | sk = chan->sk; |
2634 | ||
1da177e4 LT |
2635 | switch (result) { |
2636 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2637 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2638 | break; |
2639 | ||
2640 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2641 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2642 | char req[64]; |
2643 | ||
c2c77ec8 | 2644 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2645 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2646 | goto done; |
2647 | } | |
2648 | ||
f2fcfcd6 GP |
2649 | /* throw out any old stored conf requests */ |
2650 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2651 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2652 | req, &result); | |
f2fcfcd6 | 2653 | if (len < 0) { |
e92c8e70 | 2654 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2655 | goto done; |
2656 | } | |
2657 | ||
2658 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2659 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2660 | chan->num_conf_req++; |
f2fcfcd6 GP |
2661 | if (result != L2CAP_CONF_SUCCESS) |
2662 | goto done; | |
2663 | break; | |
1da177e4 LT |
2664 | } |
2665 | ||
8e87d142 | 2666 | default: |
b1235d79 | 2667 | sk->sk_err = ECONNRESET; |
c9b66675 | 2668 | __set_chan_timer(chan, HZ * 5); |
e92c8e70 | 2669 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2670 | goto done; |
2671 | } | |
2672 | ||
2673 | if (flags & 0x01) | |
2674 | goto done; | |
2675 | ||
b4450035 | 2676 | chan->conf_state |= L2CAP_CONF_INPUT_DONE; |
1da177e4 | 2677 | |
b4450035 | 2678 | if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { |
47d1ec61 | 2679 | set_default_fcs(chan); |
fcc203c3 | 2680 | |
89bc500e | 2681 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2682 | chan->next_tx_seq = 0; |
2683 | chan->expected_tx_seq = 0; | |
58d35f87 | 2684 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2685 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2686 | l2cap_ertm_init(chan); |
0565c1c2 | 2687 | |
1da177e4 LT |
2688 | l2cap_chan_ready(sk); |
2689 | } | |
2690 | ||
2691 | done: | |
2692 | bh_unlock_sock(sk); | |
2693 | return 0; | |
2694 | } | |
2695 | ||
2696 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2697 | { | |
2698 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2699 | struct l2cap_disconn_rsp rsp; | |
2700 | u16 dcid, scid; | |
48454079 | 2701 | struct l2cap_chan *chan; |
1da177e4 LT |
2702 | struct sock *sk; |
2703 | ||
2704 | scid = __le16_to_cpu(req->scid); | |
2705 | dcid = __le16_to_cpu(req->dcid); | |
2706 | ||
2707 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2708 | ||
baa7e1fa | 2709 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2710 | if (!chan) |
1da177e4 LT |
2711 | return 0; |
2712 | ||
48454079 GP |
2713 | sk = chan->sk; |
2714 | ||
fe4128e0 GP |
2715 | rsp.dcid = cpu_to_le16(chan->scid); |
2716 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2717 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2718 | ||
2719 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2720 | ||
a49184c2 AE |
2721 | /* don't delete l2cap channel if sk is owned by user */ |
2722 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2723 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2724 | __clear_chan_timer(chan); |
2725 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2726 | bh_unlock_sock(sk); |
2727 | return 0; | |
2728 | } | |
2729 | ||
48454079 | 2730 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2731 | bh_unlock_sock(sk); |
2732 | ||
ba3bd0ee | 2733 | chan->ops->close(chan->data); |
1da177e4 LT |
2734 | return 0; |
2735 | } | |
2736 | ||
2737 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2738 | { | |
2739 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2740 | u16 dcid, scid; | |
48454079 | 2741 | struct l2cap_chan *chan; |
1da177e4 LT |
2742 | struct sock *sk; |
2743 | ||
2744 | scid = __le16_to_cpu(rsp->scid); | |
2745 | dcid = __le16_to_cpu(rsp->dcid); | |
2746 | ||
2747 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2748 | ||
baa7e1fa | 2749 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2750 | if (!chan) |
1da177e4 LT |
2751 | return 0; |
2752 | ||
48454079 GP |
2753 | sk = chan->sk; |
2754 | ||
a49184c2 AE |
2755 | /* don't delete l2cap channel if sk is owned by user */ |
2756 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2757 | l2cap_state_change(chan,BT_DISCONN); |
c9b66675 GP |
2758 | __clear_chan_timer(chan); |
2759 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2760 | bh_unlock_sock(sk); |
2761 | return 0; | |
2762 | } | |
2763 | ||
48454079 | 2764 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2765 | bh_unlock_sock(sk); |
2766 | ||
ba3bd0ee | 2767 | chan->ops->close(chan->data); |
1da177e4 LT |
2768 | return 0; |
2769 | } | |
2770 | ||
2771 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2772 | { | |
2773 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2774 | u16 type; |
2775 | ||
2776 | type = __le16_to_cpu(req->type); | |
2777 | ||
2778 | BT_DBG("type 0x%4.4x", type); | |
2779 | ||
f0709e03 MH |
2780 | if (type == L2CAP_IT_FEAT_MASK) { |
2781 | u8 buf[8]; | |
44dd46de | 2782 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2783 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2784 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2785 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2786 | if (!disable_ertm) |
fcc203c3 GP |
2787 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2788 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2789 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2790 | l2cap_send_cmd(conn, cmd->ident, |
2791 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2792 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2793 | u8 buf[12]; | |
2794 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2795 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2796 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2797 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2798 | l2cap_send_cmd(conn, cmd->ident, | |
2799 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2800 | } else { |
2801 | struct l2cap_info_rsp rsp; | |
2802 | rsp.type = cpu_to_le16(type); | |
2803 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2804 | l2cap_send_cmd(conn, cmd->ident, | |
2805 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2806 | } | |
1da177e4 LT |
2807 | |
2808 | return 0; | |
2809 | } | |
2810 | ||
2811 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2812 | { | |
2813 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2814 | u16 type, result; | |
2815 | ||
2816 | type = __le16_to_cpu(rsp->type); | |
2817 | result = __le16_to_cpu(rsp->result); | |
2818 | ||
2819 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2820 | ||
e90165be AE |
2821 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2822 | if (cmd->ident != conn->info_ident || | |
2823 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2824 | return 0; | |
2825 | ||
4e8402a3 MH |
2826 | del_timer(&conn->info_timer); |
2827 | ||
adb08ede VT |
2828 | if (result != L2CAP_IR_SUCCESS) { |
2829 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2830 | conn->info_ident = 0; | |
2831 | ||
2832 | l2cap_conn_start(conn); | |
2833 | ||
2834 | return 0; | |
2835 | } | |
2836 | ||
984947dc | 2837 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2838 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2839 | |
47ec1dcd | 2840 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2841 | struct l2cap_info_req req; |
2842 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2843 | ||
2844 | conn->info_ident = l2cap_get_ident(conn); | |
2845 | ||
2846 | l2cap_send_cmd(conn, conn->info_ident, | |
2847 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2848 | } else { | |
2849 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2850 | conn->info_ident = 0; | |
2851 | ||
2852 | l2cap_conn_start(conn); | |
2853 | } | |
2854 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2855 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2856 | conn->info_ident = 0; |
984947dc MH |
2857 | |
2858 | l2cap_conn_start(conn); | |
2859 | } | |
4e8402a3 | 2860 | |
1da177e4 LT |
2861 | return 0; |
2862 | } | |
2863 | ||
e2174ca4 | 2864 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2865 | u16 to_multiplier) |
2866 | { | |
2867 | u16 max_latency; | |
2868 | ||
2869 | if (min > max || min < 6 || max > 3200) | |
2870 | return -EINVAL; | |
2871 | ||
2872 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2873 | return -EINVAL; | |
2874 | ||
2875 | if (max >= to_multiplier * 8) | |
2876 | return -EINVAL; | |
2877 | ||
2878 | max_latency = (to_multiplier * 8 / max) - 1; | |
2879 | if (latency > 499 || latency > max_latency) | |
2880 | return -EINVAL; | |
2881 | ||
2882 | return 0; | |
2883 | } | |
2884 | ||
2885 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2886 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2887 | { | |
2888 | struct hci_conn *hcon = conn->hcon; | |
2889 | struct l2cap_conn_param_update_req *req; | |
2890 | struct l2cap_conn_param_update_rsp rsp; | |
2891 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2892 | int err; |
de73115a CT |
2893 | |
2894 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2895 | return -EINVAL; | |
2896 | ||
2897 | cmd_len = __le16_to_cpu(cmd->len); | |
2898 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2899 | return -EPROTO; | |
2900 | ||
2901 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2902 | min = __le16_to_cpu(req->min); |
2903 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2904 | latency = __le16_to_cpu(req->latency); |
2905 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2906 | ||
2907 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2908 | min, max, latency, to_multiplier); | |
2909 | ||
2910 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2911 | |
2912 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2913 | if (err) | |
de73115a CT |
2914 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2915 | else | |
2916 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2917 | ||
2918 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2919 | sizeof(rsp), &rsp); | |
2920 | ||
2ce603eb CT |
2921 | if (!err) |
2922 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2923 | ||
de73115a CT |
2924 | return 0; |
2925 | } | |
2926 | ||
3300d9a9 CT |
2927 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2928 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2929 | { | |
2930 | int err = 0; | |
2931 | ||
2932 | switch (cmd->code) { | |
2933 | case L2CAP_COMMAND_REJ: | |
2934 | l2cap_command_rej(conn, cmd, data); | |
2935 | break; | |
2936 | ||
2937 | case L2CAP_CONN_REQ: | |
2938 | err = l2cap_connect_req(conn, cmd, data); | |
2939 | break; | |
2940 | ||
2941 | case L2CAP_CONN_RSP: | |
2942 | err = l2cap_connect_rsp(conn, cmd, data); | |
2943 | break; | |
2944 | ||
2945 | case L2CAP_CONF_REQ: | |
2946 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2947 | break; | |
2948 | ||
2949 | case L2CAP_CONF_RSP: | |
2950 | err = l2cap_config_rsp(conn, cmd, data); | |
2951 | break; | |
2952 | ||
2953 | case L2CAP_DISCONN_REQ: | |
2954 | err = l2cap_disconnect_req(conn, cmd, data); | |
2955 | break; | |
2956 | ||
2957 | case L2CAP_DISCONN_RSP: | |
2958 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2959 | break; | |
2960 | ||
2961 | case L2CAP_ECHO_REQ: | |
2962 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2963 | break; | |
2964 | ||
2965 | case L2CAP_ECHO_RSP: | |
2966 | break; | |
2967 | ||
2968 | case L2CAP_INFO_REQ: | |
2969 | err = l2cap_information_req(conn, cmd, data); | |
2970 | break; | |
2971 | ||
2972 | case L2CAP_INFO_RSP: | |
2973 | err = l2cap_information_rsp(conn, cmd, data); | |
2974 | break; | |
2975 | ||
2976 | default: | |
2977 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2978 | err = -EINVAL; | |
2979 | break; | |
2980 | } | |
2981 | ||
2982 | return err; | |
2983 | } | |
2984 | ||
2985 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2986 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2987 | { | |
2988 | switch (cmd->code) { | |
2989 | case L2CAP_COMMAND_REJ: | |
2990 | return 0; | |
2991 | ||
2992 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2993 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2994 | |
2995 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2996 | return 0; | |
2997 | ||
2998 | default: | |
2999 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3000 | return -EINVAL; | |
3001 | } | |
3002 | } | |
3003 | ||
3004 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3005 | struct sk_buff *skb) | |
1da177e4 LT |
3006 | { |
3007 | u8 *data = skb->data; | |
3008 | int len = skb->len; | |
3009 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3010 | int err; |
1da177e4 LT |
3011 | |
3012 | l2cap_raw_recv(conn, skb); | |
3013 | ||
3014 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3015 | u16 cmd_len; |
1da177e4 LT |
3016 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3017 | data += L2CAP_CMD_HDR_SIZE; | |
3018 | len -= L2CAP_CMD_HDR_SIZE; | |
3019 | ||
88219a0f | 3020 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3021 | |
88219a0f | 3022 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3023 | |
88219a0f | 3024 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3025 | BT_DBG("corrupted command"); |
3026 | break; | |
3027 | } | |
3028 | ||
3300d9a9 CT |
3029 | if (conn->hcon->type == LE_LINK) |
3030 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3031 | else | |
3032 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3033 | |
3034 | if (err) { | |
3035 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
3036 | |
3037 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3038 | |
3039 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3040 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3041 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3042 | } | |
3043 | ||
88219a0f AV |
3044 | data += cmd_len; |
3045 | len -= cmd_len; | |
1da177e4 LT |
3046 | } |
3047 | ||
3048 | kfree_skb(skb); | |
3049 | } | |
3050 | ||
47d1ec61 | 3051 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3052 | { |
3053 | u16 our_fcs, rcv_fcs; | |
3054 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3055 | ||
47d1ec61 | 3056 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
3057 | skb_trim(skb, skb->len - 2); |
3058 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3059 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3060 | ||
3061 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3062 | return -EBADMSG; |
fcc203c3 GP |
3063 | } |
3064 | return 0; | |
3065 | } | |
3066 | ||
525cd185 | 3067 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3068 | { |
d5392c8f GP |
3069 | u16 control = 0; |
3070 | ||
6a026610 | 3071 | chan->frames_sent = 0; |
d5392c8f | 3072 | |
42e5c802 | 3073 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 3074 | |
525cd185 | 3075 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
64988868 | 3076 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
3077 | l2cap_send_sframe(chan, control); |
3078 | chan->conn_state |= L2CAP_CONN_RNR_SENT; | |
d5392c8f GP |
3079 | } |
3080 | ||
525cd185 GP |
3081 | if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) |
3082 | l2cap_retransmit_frames(chan); | |
d5392c8f | 3083 | |
525cd185 | 3084 | l2cap_ertm_send(chan); |
d5392c8f | 3085 | |
525cd185 | 3086 | if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && |
6a026610 | 3087 | chan->frames_sent == 0) { |
d5392c8f | 3088 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 3089 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3090 | } |
3091 | } | |
3092 | ||
42e5c802 | 3093 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3094 | { |
3095 | struct sk_buff *next_skb; | |
bfbacc11 | 3096 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3097 | |
3098 | bt_cb(skb)->tx_seq = tx_seq; | |
3099 | bt_cb(skb)->sar = sar; | |
3100 | ||
f1c6775b | 3101 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3102 | if (!next_skb) { |
f1c6775b | 3103 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 3104 | return 0; |
8f17154f GP |
3105 | } |
3106 | ||
42e5c802 | 3107 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3108 | if (tx_seq_offset < 0) |
3109 | tx_seq_offset += 64; | |
3110 | ||
8f17154f | 3111 | do { |
9b53350d JPRV |
3112 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3113 | return -EINVAL; | |
3114 | ||
bfbacc11 | 3115 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 3116 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3117 | if (next_tx_seq_offset < 0) |
3118 | next_tx_seq_offset += 64; | |
3119 | ||
3120 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3121 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3122 | return 0; |
8f17154f GP |
3123 | } |
3124 | ||
f1c6775b | 3125 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
3126 | break; |
3127 | ||
f1c6775b | 3128 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 3129 | |
f1c6775b | 3130 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3131 | |
3132 | return 0; | |
8f17154f GP |
3133 | } |
3134 | ||
525cd185 | 3135 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 3136 | { |
18778a63 | 3137 | struct sk_buff *_skb; |
1890d36b | 3138 | int err; |
18778a63 GP |
3139 | |
3140 | switch (control & L2CAP_CTRL_SAR) { | |
3141 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3142 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
3143 | goto drop; |
3144 | ||
23070494 | 3145 | return chan->ops->recv(chan->data, skb); |
18778a63 GP |
3146 | |
3147 | case L2CAP_SDU_START: | |
525cd185 | 3148 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
3149 | goto drop; |
3150 | ||
6f61fd47 | 3151 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 3152 | |
0c1bc5c6 | 3153 | if (chan->sdu_len > chan->imtu) |
18778a63 GP |
3154 | goto disconnect; |
3155 | ||
6f61fd47 GP |
3156 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3157 | if (!chan->sdu) | |
1890d36b GP |
3158 | return -ENOMEM; |
3159 | ||
3160 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3161 | * condition we have to be sure that this will be executed | |
3162 | * only once, i.e., when alloc does not fail */ | |
3163 | skb_pull(skb, 2); | |
18778a63 | 3164 | |
6f61fd47 | 3165 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 3166 | |
525cd185 | 3167 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3168 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
3169 | break; |
3170 | ||
3171 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3172 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
3173 | goto disconnect; |
3174 | ||
6f61fd47 | 3175 | if (!chan->sdu) |
18778a63 GP |
3176 | goto disconnect; |
3177 | ||
6f61fd47 GP |
3178 | chan->partial_sdu_len += skb->len; |
3179 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
3180 | goto drop; |
3181 | ||
6f61fd47 | 3182 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 3183 | |
18778a63 GP |
3184 | break; |
3185 | ||
3186 | case L2CAP_SDU_END: | |
525cd185 | 3187 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
3188 | goto disconnect; |
3189 | ||
6f61fd47 | 3190 | if (!chan->sdu) |
18778a63 GP |
3191 | goto disconnect; |
3192 | ||
525cd185 | 3193 | if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { |
6f61fd47 | 3194 | chan->partial_sdu_len += skb->len; |
18778a63 | 3195 | |
0c1bc5c6 | 3196 | if (chan->partial_sdu_len > chan->imtu) |
1890d36b | 3197 | goto drop; |
18778a63 | 3198 | |
6f61fd47 | 3199 | if (chan->partial_sdu_len != chan->sdu_len) |
1890d36b | 3200 | goto drop; |
4178ba46 | 3201 | |
6f61fd47 | 3202 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
1890d36b | 3203 | } |
18778a63 | 3204 | |
6f61fd47 | 3205 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 3206 | if (!_skb) { |
525cd185 | 3207 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
3208 | return -ENOMEM; |
3209 | } | |
3210 | ||
23070494 | 3211 | err = chan->ops->recv(chan->data, _skb); |
1890d36b | 3212 | if (err < 0) { |
18778a63 | 3213 | kfree_skb(_skb); |
525cd185 | 3214 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
3215 | return err; |
3216 | } | |
3217 | ||
525cd185 GP |
3218 | chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; |
3219 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 | 3220 | |
6f61fd47 | 3221 | kfree_skb(chan->sdu); |
18778a63 GP |
3222 | break; |
3223 | } | |
3224 | ||
3225 | kfree_skb(skb); | |
1890d36b | 3226 | return 0; |
18778a63 GP |
3227 | |
3228 | drop: | |
6f61fd47 GP |
3229 | kfree_skb(chan->sdu); |
3230 | chan->sdu = NULL; | |
18778a63 GP |
3231 | |
3232 | disconnect: | |
8c1d787b | 3233 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
18778a63 GP |
3234 | kfree_skb(skb); |
3235 | return 0; | |
3236 | } | |
3237 | ||
525cd185 | 3238 | static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) |
712132eb | 3239 | { |
712132eb GP |
3240 | struct sk_buff *skb; |
3241 | u16 control; | |
3242 | int err; | |
3243 | ||
f1c6775b | 3244 | while ((skb = skb_dequeue(&chan->busy_q))) { |
712132eb | 3245 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3246 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
712132eb | 3247 | if (err < 0) { |
f1c6775b | 3248 | skb_queue_head(&chan->busy_q, skb); |
712132eb GP |
3249 | return -EBUSY; |
3250 | } | |
3251 | ||
42e5c802 | 3252 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
712132eb GP |
3253 | } |
3254 | ||
525cd185 | 3255 | if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) |
712132eb GP |
3256 | goto done; |
3257 | ||
42e5c802 | 3258 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 3259 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 3260 | l2cap_send_sframe(chan, control); |
6a026610 | 3261 | chan->retry_count = 1; |
712132eb | 3262 | |
1a09bcb9 GP |
3263 | __clear_retrans_timer(chan); |
3264 | __set_monitor_timer(chan); | |
712132eb | 3265 | |
525cd185 | 3266 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
712132eb GP |
3267 | |
3268 | done: | |
525cd185 GP |
3269 | chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; |
3270 | chan->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
712132eb | 3271 | |
49208c9c | 3272 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3273 | |
3274 | return 0; | |
3275 | } | |
3276 | ||
1890d36b GP |
3277 | static void l2cap_busy_work(struct work_struct *work) |
3278 | { | |
3279 | DECLARE_WAITQUEUE(wait, current); | |
311bb895 GP |
3280 | struct l2cap_chan *chan = |
3281 | container_of(work, struct l2cap_chan, busy_work); | |
3282 | struct sock *sk = chan->sk; | |
1890d36b GP |
3283 | int n_tries = 0, timeo = HZ/5, err; |
3284 | struct sk_buff *skb; | |
1890d36b GP |
3285 | |
3286 | lock_sock(sk); | |
3287 | ||
2b0b05dd | 3288 | add_wait_queue(sk_sleep(sk), &wait); |
311bb895 | 3289 | while ((skb = skb_peek(&chan->busy_q))) { |
1890d36b GP |
3290 | set_current_state(TASK_INTERRUPTIBLE); |
3291 | ||
3292 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3293 | err = -EBUSY; | |
8c1d787b | 3294 | l2cap_send_disconn_req(chan->conn, chan, EBUSY); |
712132eb | 3295 | break; |
1890d36b GP |
3296 | } |
3297 | ||
3298 | if (!timeo) | |
3299 | timeo = HZ/5; | |
3300 | ||
3301 | if (signal_pending(current)) { | |
3302 | err = sock_intr_errno(timeo); | |
712132eb | 3303 | break; |
1890d36b GP |
3304 | } |
3305 | ||
3306 | release_sock(sk); | |
3307 | timeo = schedule_timeout(timeo); | |
3308 | lock_sock(sk); | |
3309 | ||
3310 | err = sock_error(sk); | |
3311 | if (err) | |
712132eb | 3312 | break; |
1890d36b | 3313 | |
311bb895 | 3314 | if (l2cap_try_push_rx_skb(chan) == 0) |
1890d36b GP |
3315 | break; |
3316 | } | |
3317 | ||
1890d36b | 3318 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3319 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3320 | |
3321 | release_sock(sk); | |
3322 | } | |
3323 | ||
525cd185 | 3324 | static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
1890d36b | 3325 | { |
1890d36b GP |
3326 | int sctrl, err; |
3327 | ||
525cd185 | 3328 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
1890d36b | 3329 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3330 | __skb_queue_tail(&chan->busy_q, skb); |
525cd185 | 3331 | return l2cap_try_push_rx_skb(chan); |
712132eb GP |
3332 | |
3333 | ||
1890d36b GP |
3334 | } |
3335 | ||
525cd185 | 3336 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
1890d36b | 3337 | if (err >= 0) { |
42e5c802 | 3338 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
1890d36b GP |
3339 | return err; |
3340 | } | |
3341 | ||
3342 | /* Busy Condition */ | |
311bb895 | 3343 | BT_DBG("chan %p, Enter local busy", chan); |
0e98958d | 3344 | |
525cd185 | 3345 | chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
1890d36b | 3346 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3347 | __skb_queue_tail(&chan->busy_q, skb); |
1890d36b | 3348 | |
42e5c802 | 3349 | sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1890d36b | 3350 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3351 | l2cap_send_sframe(chan, sctrl); |
1890d36b | 3352 | |
525cd185 | 3353 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 3354 | |
1a09bcb9 | 3355 | __clear_ack_timer(chan); |
7fe9b298 | 3356 | |
311bb895 | 3357 | queue_work(_busy_wq, &chan->busy_work); |
1890d36b GP |
3358 | |
3359 | return err; | |
3360 | } | |
3361 | ||
525cd185 | 3362 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3363 | { |
c74e560c GP |
3364 | struct sk_buff *_skb; |
3365 | int err = -EINVAL; | |
3366 | ||
18778a63 GP |
3367 | /* |
3368 | * TODO: We have to notify the userland if some data is lost with the | |
3369 | * Streaming Mode. | |
3370 | */ | |
3371 | ||
c74e560c GP |
3372 | switch (control & L2CAP_CTRL_SAR) { |
3373 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3374 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3375 | kfree_skb(chan->sdu); |
c74e560c GP |
3376 | break; |
3377 | } | |
3378 | ||
23070494 | 3379 | err = chan->ops->recv(chan->data, skb); |
c74e560c GP |
3380 | if (!err) |
3381 | return 0; | |
3382 | ||
3383 | break; | |
3384 | ||
3385 | case L2CAP_SDU_START: | |
525cd185 | 3386 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3387 | kfree_skb(chan->sdu); |
c74e560c GP |
3388 | break; |
3389 | } | |
3390 | ||
6f61fd47 | 3391 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3392 | skb_pull(skb, 2); |
3393 | ||
0c1bc5c6 | 3394 | if (chan->sdu_len > chan->imtu) { |
052897ca GP |
3395 | err = -EMSGSIZE; |
3396 | break; | |
3397 | } | |
3398 | ||
6f61fd47 GP |
3399 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3400 | if (!chan->sdu) { | |
c74e560c GP |
3401 | err = -ENOMEM; |
3402 | break; | |
3403 | } | |
3404 | ||
6f61fd47 | 3405 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3406 | |
525cd185 | 3407 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3408 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3409 | err = 0; |
3410 | break; | |
3411 | ||
3412 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3413 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3414 | break; |
3415 | ||
6f61fd47 | 3416 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3417 | |
6f61fd47 GP |
3418 | chan->partial_sdu_len += skb->len; |
3419 | if (chan->partial_sdu_len > chan->sdu_len) | |
3420 | kfree_skb(chan->sdu); | |
c74e560c GP |
3421 | else |
3422 | err = 0; | |
3423 | ||
3424 | break; | |
3425 | ||
3426 | case L2CAP_SDU_END: | |
525cd185 | 3427 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3428 | break; |
3429 | ||
6f61fd47 | 3430 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3431 | |
525cd185 | 3432 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3433 | chan->partial_sdu_len += skb->len; |
c74e560c | 3434 | |
0c1bc5c6 | 3435 | if (chan->partial_sdu_len > chan->imtu) |
36f2fd58 GP |
3436 | goto drop; |
3437 | ||
6f61fd47 GP |
3438 | if (chan->partial_sdu_len == chan->sdu_len) { |
3439 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
23070494 | 3440 | err = chan->ops->recv(chan->data, _skb); |
c74e560c GP |
3441 | if (err < 0) |
3442 | kfree_skb(_skb); | |
3443 | } | |
c74e560c GP |
3444 | err = 0; |
3445 | ||
36f2fd58 | 3446 | drop: |
6f61fd47 | 3447 | kfree_skb(chan->sdu); |
c74e560c GP |
3448 | break; |
3449 | } | |
3450 | ||
3451 | kfree_skb(skb); | |
3452 | return err; | |
3453 | } | |
3454 | ||
525cd185 | 3455 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3456 | { |
3457 | struct sk_buff *skb; | |
afefdbc4 | 3458 | u16 control; |
8f17154f | 3459 | |
f1c6775b | 3460 | while ((skb = skb_peek(&chan->srej_q))) { |
8f17154f GP |
3461 | if (bt_cb(skb)->tx_seq != tx_seq) |
3462 | break; | |
3463 | ||
f1c6775b | 3464 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3465 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3466 | l2cap_ertm_reassembly_sdu(chan, skb, control); |
42e5c802 GP |
3467 | chan->buffer_seq_srej = |
3468 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3469 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3470 | } |
3471 | } | |
3472 | ||
525cd185 | 3473 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3474 | { |
8f17154f GP |
3475 | struct srej_list *l, *tmp; |
3476 | u16 control; | |
3477 | ||
39d5a3ee | 3478 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3479 | if (l->tx_seq == tx_seq) { |
3480 | list_del(&l->list); | |
3481 | kfree(l); | |
3482 | return; | |
3483 | } | |
3484 | control = L2CAP_SUPER_SELECT_REJECT; | |
3485 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3486 | l2cap_send_sframe(chan, control); |
8f17154f | 3487 | list_del(&l->list); |
39d5a3ee | 3488 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3489 | } |
3490 | } | |
3491 | ||
525cd185 | 3492 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3493 | { |
8f17154f GP |
3494 | struct srej_list *new; |
3495 | u16 control; | |
3496 | ||
42e5c802 | 3497 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3498 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3499 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3500 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3501 | |
3502 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3503 | new->tx_seq = chan->expected_tx_seq; |
3504 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3505 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3506 | } |
42e5c802 | 3507 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3508 | } |
3509 | ||
525cd185 | 3510 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3511 | { |
1c2acffb | 3512 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3513 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3514 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3515 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3516 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3517 | int err = 0; |
3518 | ||
525cd185 GP |
3519 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3520 | tx_seq, rx_control); | |
1c2acffb | 3521 | |
9b16dc65 | 3522 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3523 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
1a09bcb9 | 3524 | __clear_monitor_timer(chan); |
6a026610 | 3525 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3526 | __set_retrans_timer(chan); |
525cd185 | 3527 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
1d8f5d16 GP |
3528 | } |
3529 | ||
42e5c802 GP |
3530 | chan->expected_ack_seq = req_seq; |
3531 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3532 | |
42e5c802 | 3533 | if (tx_seq == chan->expected_tx_seq) |
8f17154f | 3534 | goto expected; |
1c2acffb | 3535 | |
42e5c802 | 3536 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3537 | if (tx_seq_offset < 0) |
3538 | tx_seq_offset += 64; | |
3539 | ||
3540 | /* invalid tx_seq */ | |
47d1ec61 | 3541 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3542 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3543 | goto drop; |
3544 | } | |
3545 | ||
e6949280 | 3546 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) |
1890d36b GP |
3547 | goto drop; |
3548 | ||
525cd185 | 3549 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
8f17154f | 3550 | struct srej_list *first; |
30afb5b2 | 3551 | |
39d5a3ee | 3552 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3553 | struct srej_list, list); |
3554 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3555 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3556 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3557 | |
3558 | list_del(&first->list); | |
3559 | kfree(first); | |
3560 | ||
39d5a3ee | 3561 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3562 | chan->buffer_seq = chan->buffer_seq_srej; |
525cd185 GP |
3563 | chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3564 | l2cap_send_ack(chan); | |
49208c9c | 3565 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3566 | } |
3567 | } else { | |
3568 | struct srej_list *l; | |
9b53350d JPRV |
3569 | |
3570 | /* duplicated tx_seq */ | |
42e5c802 | 3571 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3572 | goto drop; |
8f17154f | 3573 | |
39d5a3ee | 3574 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3575 | if (l->tx_seq == tx_seq) { |
525cd185 | 3576 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3577 | return 0; |
3578 | } | |
3579 | } | |
525cd185 | 3580 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3581 | } |
3582 | } else { | |
9b53350d | 3583 | expected_tx_seq_offset = |
42e5c802 | 3584 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3585 | if (expected_tx_seq_offset < 0) |
3586 | expected_tx_seq_offset += 64; | |
3587 | ||
3588 | /* duplicated tx_seq */ | |
3589 | if (tx_seq_offset < expected_tx_seq_offset) | |
3590 | goto drop; | |
3591 | ||
525cd185 | 3592 | chan->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3593 | |
49208c9c | 3594 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3595 | |
39d5a3ee | 3596 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3597 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3598 | |
f1c6775b GP |
3599 | __skb_queue_head_init(&chan->srej_q); |
3600 | __skb_queue_head_init(&chan->busy_q); | |
42e5c802 | 3601 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3602 | |
525cd185 | 3603 | chan->conn_state |= L2CAP_CONN_SEND_PBIT; |
ef54fd93 | 3604 | |
525cd185 | 3605 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3606 | |
1a09bcb9 | 3607 | __clear_ack_timer(chan); |
1c2acffb | 3608 | } |
30afb5b2 GP |
3609 | return 0; |
3610 | ||
8f17154f | 3611 | expected: |
42e5c802 | 3612 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3613 | |
525cd185 | 3614 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
3b1a9f3f GP |
3615 | bt_cb(skb)->tx_seq = tx_seq; |
3616 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3617 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3618 | return 0; |
3619 | } | |
3620 | ||
525cd185 | 3621 | err = l2cap_push_rx_skb(chan, skb, rx_control); |
2ece3684 GP |
3622 | if (err < 0) |
3623 | return 0; | |
3624 | ||
4ec10d97 | 3625 | if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 GP |
3626 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3627 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3628 | else |
525cd185 | 3629 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3630 | } |
3631 | ||
1a09bcb9 | 3632 | __set_ack_timer(chan); |
c1b4f43b | 3633 | |
6a026610 GP |
3634 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3635 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3636 | l2cap_send_ack(chan); |
9e917af1 | 3637 | |
8f17154f | 3638 | return 0; |
9b53350d JPRV |
3639 | |
3640 | drop: | |
3641 | kfree_skb(skb); | |
3642 | return 0; | |
1c2acffb GP |
3643 | } |
3644 | ||
525cd185 | 3645 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3646 | { |
49208c9c | 3647 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3648 | rx_control); |
3649 | ||
42e5c802 GP |
3650 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3651 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3652 | |
e072745f | 3653 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 GP |
3654 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3655 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3656 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
6a026610 | 3657 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3658 | __set_retrans_timer(chan); |
05fbd89d | 3659 | |
525cd185 GP |
3660 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3661 | l2cap_send_srejtail(chan); | |
05fbd89d | 3662 | } else { |
525cd185 | 3663 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3664 | } |
1d8f5d16 | 3665 | |
e072745f | 3666 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3667 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4ec10d97 | 3668 | |
525cd185 GP |
3669 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3670 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3671 | else |
525cd185 | 3672 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3673 | |
e072745f | 3674 | } else { |
525cd185 | 3675 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
6a026610 | 3676 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3677 | __set_retrans_timer(chan); |
1c2acffb | 3678 | |
525cd185 GP |
3679 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3680 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) | |
3681 | l2cap_send_ack(chan); | |
894718a6 | 3682 | else |
525cd185 | 3683 | l2cap_ertm_send(chan); |
e072745f GP |
3684 | } |
3685 | } | |
2246b2f1 | 3686 | |
525cd185 | 3687 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3688 | { |
e072745f | 3689 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3690 | |
525cd185 | 3691 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3692 | |
525cd185 | 3693 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f | 3694 | |
42e5c802 GP |
3695 | chan->expected_ack_seq = tx_seq; |
3696 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3697 | |
3698 | if (rx_control & L2CAP_CTRL_FINAL) { | |
525cd185 GP |
3699 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3700 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3701 | else |
525cd185 | 3702 | l2cap_retransmit_frames(chan); |
e072745f | 3703 | } else { |
525cd185 | 3704 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3705 | |
525cd185 GP |
3706 | if (chan->conn_state & L2CAP_CONN_WAIT_F) |
3707 | chan->conn_state |= L2CAP_CONN_REJ_ACT; | |
e072745f GP |
3708 | } |
3709 | } | |
525cd185 | 3710 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3711 | { |
e072745f | 3712 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3713 | |
525cd185 | 3714 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3715 | |
525cd185 | 3716 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3717 | |
e072745f | 3718 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3719 | chan->expected_ack_seq = tx_seq; |
3720 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3721 | |
525cd185 GP |
3722 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3723 | l2cap_retransmit_one_frame(chan, tx_seq); | |
dfc909be | 3724 | |
525cd185 | 3725 | l2cap_ertm_send(chan); |
dfc909be | 3726 | |
525cd185 | 3727 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { |
6a026610 | 3728 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3729 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3730 | } |
e072745f | 3731 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3732 | if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && |
6a026610 | 3733 | chan->srej_save_reqseq == tx_seq) |
525cd185 | 3734 | chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
e072745f | 3735 | else |
525cd185 | 3736 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3737 | } else { |
525cd185 GP |
3738 | l2cap_retransmit_one_frame(chan, tx_seq); |
3739 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { | |
6a026610 | 3740 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3741 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3742 | } |
e072745f GP |
3743 | } |
3744 | } | |
3745 | ||
525cd185 | 3746 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3747 | { |
e072745f GP |
3748 | u8 tx_seq = __get_reqseq(rx_control); |
3749 | ||
525cd185 | 3750 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3751 | |
525cd185 | 3752 | chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
42e5c802 GP |
3753 | chan->expected_ack_seq = tx_seq; |
3754 | l2cap_drop_acked_frames(chan); | |
e072745f | 3755 | |
3cb123d1 | 3756 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3757 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 3758 | |
525cd185 | 3759 | if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { |
1a09bcb9 | 3760 | __clear_retrans_timer(chan); |
a2e12a2a | 3761 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3762 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3763 | return; |
e072745f | 3764 | } |
99b0d4b7 GP |
3765 | |
3766 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3767 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3768 | else |
525cd185 | 3769 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3770 | } |
3771 | ||
525cd185 | 3772 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3773 | { |
525cd185 | 3774 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3775 | |
9b16dc65 | 3776 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3777 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
1a09bcb9 | 3778 | __clear_monitor_timer(chan); |
6a026610 | 3779 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3780 | __set_retrans_timer(chan); |
525cd185 | 3781 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
e072745f GP |
3782 | } |
3783 | ||
3784 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3785 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3786 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3787 | break; |
3788 | ||
e072745f | 3789 | case L2CAP_SUPER_REJECT: |
525cd185 | 3790 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3791 | break; |
2246b2f1 | 3792 | |
e072745f | 3793 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3794 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3795 | break; |
3796 | ||
3797 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3798 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3799 | break; |
3800 | } | |
3801 | ||
faaebd19 | 3802 | kfree_skb(skb); |
1c2acffb GP |
3803 | return 0; |
3804 | } | |
3805 | ||
218bb9df GP |
3806 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3807 | { | |
525cd185 | 3808 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3809 | u16 control; |
3810 | u8 req_seq; | |
3811 | int len, next_tx_seq_offset, req_seq_offset; | |
3812 | ||
3813 | control = get_unaligned_le16(skb->data); | |
3814 | skb_pull(skb, 2); | |
3815 | len = skb->len; | |
3816 | ||
3817 | /* | |
3818 | * We can just drop the corrupted I-frame here. | |
3819 | * Receiver will miss it and start proper recovery | |
3820 | * procedures and ask retransmission. | |
3821 | */ | |
47d1ec61 | 3822 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3823 | goto drop; |
3824 | ||
3825 | if (__is_sar_start(control) && __is_iframe(control)) | |
3826 | len -= 2; | |
3827 | ||
47d1ec61 | 3828 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3829 | len -= 2; |
3830 | ||
47d1ec61 | 3831 | if (len > chan->mps) { |
8c1d787b | 3832 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3833 | goto drop; |
3834 | } | |
3835 | ||
3836 | req_seq = __get_reqseq(control); | |
42e5c802 | 3837 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3838 | if (req_seq_offset < 0) |
3839 | req_seq_offset += 64; | |
3840 | ||
3841 | next_tx_seq_offset = | |
42e5c802 | 3842 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3843 | if (next_tx_seq_offset < 0) |
3844 | next_tx_seq_offset += 64; | |
3845 | ||
3846 | /* check for invalid req-seq */ | |
3847 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 3848 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3849 | goto drop; |
3850 | } | |
3851 | ||
3852 | if (__is_iframe(control)) { | |
3853 | if (len < 0) { | |
8c1d787b | 3854 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3855 | goto drop; |
3856 | } | |
3857 | ||
525cd185 | 3858 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3859 | } else { |
3860 | if (len != 0) { | |
3861 | BT_ERR("%d", len); | |
8c1d787b | 3862 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3863 | goto drop; |
3864 | } | |
3865 | ||
525cd185 | 3866 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3867 | } |
3868 | ||
3869 | return 0; | |
3870 | ||
3871 | drop: | |
3872 | kfree_skb(skb); | |
3873 | return 0; | |
3874 | } | |
3875 | ||
1da177e4 LT |
3876 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3877 | { | |
48454079 | 3878 | struct l2cap_chan *chan; |
bf734843 | 3879 | struct sock *sk = NULL; |
51893f88 | 3880 | u16 control; |
218bb9df GP |
3881 | u8 tx_seq; |
3882 | int len; | |
1da177e4 | 3883 | |
baa7e1fa | 3884 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3885 | if (!chan) { |
1da177e4 LT |
3886 | BT_DBG("unknown cid 0x%4.4x", cid); |
3887 | goto drop; | |
3888 | } | |
3889 | ||
48454079 | 3890 | sk = chan->sk; |
6840ed07 | 3891 | |
49208c9c | 3892 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 3893 | |
89bc500e | 3894 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
3895 | goto drop; |
3896 | ||
0c1bc5c6 | 3897 | switch (chan->mode) { |
1c2acffb GP |
3898 | case L2CAP_MODE_BASIC: |
3899 | /* If socket recv buffers overflows we drop data here | |
3900 | * which is *bad* because L2CAP has to be reliable. | |
3901 | * But we don't have any other choice. L2CAP doesn't | |
3902 | * provide flow control mechanism. */ | |
1da177e4 | 3903 | |
0c1bc5c6 | 3904 | if (chan->imtu < skb->len) |
1c2acffb | 3905 | goto drop; |
1da177e4 | 3906 | |
23070494 | 3907 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
3908 | goto done; |
3909 | break; | |
3910 | ||
3911 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3912 | if (!sock_owned_by_user(sk)) { |
3913 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3914 | } else { |
218bb9df | 3915 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3916 | goto drop; |
277ffbe3 | 3917 | } |
1c2acffb | 3918 | |
fcafde2e | 3919 | goto done; |
1c2acffb | 3920 | |
6840ed07 GP |
3921 | case L2CAP_MODE_STREAMING: |
3922 | control = get_unaligned_le16(skb->data); | |
3923 | skb_pull(skb, 2); | |
3924 | len = skb->len; | |
3925 | ||
47d1ec61 | 3926 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3927 | goto drop; |
3928 | ||
6840ed07 GP |
3929 | if (__is_sar_start(control)) |
3930 | len -= 2; | |
3931 | ||
47d1ec61 | 3932 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3933 | len -= 2; |
3934 | ||
47d1ec61 | 3935 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3936 | goto drop; |
3937 | ||
3938 | tx_seq = __get_txseq(control); | |
3939 | ||
42e5c802 GP |
3940 | if (chan->expected_tx_seq == tx_seq) |
3941 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3942 | else |
42e5c802 | 3943 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3944 | |
525cd185 | 3945 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3946 | |
3947 | goto done; | |
3948 | ||
1c2acffb | 3949 | default: |
0c1bc5c6 | 3950 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3951 | break; |
3952 | } | |
1da177e4 LT |
3953 | |
3954 | drop: | |
3955 | kfree_skb(skb); | |
3956 | ||
3957 | done: | |
0139418c MH |
3958 | if (sk) |
3959 | bh_unlock_sock(sk); | |
3960 | ||
1da177e4 LT |
3961 | return 0; |
3962 | } | |
3963 | ||
8e036fc3 | 3964 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 3965 | { |
6dcae1ea | 3966 | struct sock *sk = NULL; |
23691d75 | 3967 | struct l2cap_chan *chan; |
1da177e4 | 3968 | |
23691d75 GP |
3969 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
3970 | if (!chan) | |
1da177e4 LT |
3971 | goto drop; |
3972 | ||
23691d75 GP |
3973 | sk = chan->sk; |
3974 | ||
e0f0cb56 GP |
3975 | bh_lock_sock(sk); |
3976 | ||
1da177e4 LT |
3977 | BT_DBG("sk %p, len %d", sk, skb->len); |
3978 | ||
89bc500e | 3979 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
3980 | goto drop; |
3981 | ||
0c1bc5c6 | 3982 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
1da177e4 LT |
3983 | goto drop; |
3984 | ||
23070494 | 3985 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
3986 | goto done; |
3987 | ||
3988 | drop: | |
3989 | kfree_skb(skb); | |
3990 | ||
3991 | done: | |
af05b30b GP |
3992 | if (sk) |
3993 | bh_unlock_sock(sk); | |
1da177e4 LT |
3994 | return 0; |
3995 | } | |
3996 | ||
9f69bda6 GP |
3997 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3998 | { | |
6dcae1ea | 3999 | struct sock *sk = NULL; |
23691d75 | 4000 | struct l2cap_chan *chan; |
9f69bda6 | 4001 | |
23691d75 GP |
4002 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4003 | if (!chan) | |
9f69bda6 GP |
4004 | goto drop; |
4005 | ||
23691d75 GP |
4006 | sk = chan->sk; |
4007 | ||
9f69bda6 GP |
4008 | bh_lock_sock(sk); |
4009 | ||
4010 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4011 | ||
89bc500e | 4012 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4013 | goto drop; |
4014 | ||
0c1bc5c6 | 4015 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
9f69bda6 GP |
4016 | goto drop; |
4017 | ||
23070494 | 4018 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
4019 | goto done; |
4020 | ||
4021 | drop: | |
4022 | kfree_skb(skb); | |
4023 | ||
4024 | done: | |
4025 | if (sk) | |
4026 | bh_unlock_sock(sk); | |
4027 | return 0; | |
4028 | } | |
4029 | ||
1da177e4 LT |
4030 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4031 | { | |
4032 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4033 | u16 cid, len; |
4034 | __le16 psm; | |
1da177e4 LT |
4035 | |
4036 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4037 | cid = __le16_to_cpu(lh->cid); | |
4038 | len = __le16_to_cpu(lh->len); | |
4039 | ||
1c2acffb GP |
4040 | if (len != skb->len) { |
4041 | kfree_skb(skb); | |
4042 | return; | |
4043 | } | |
4044 | ||
1da177e4 LT |
4045 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4046 | ||
4047 | switch (cid) { | |
3300d9a9 | 4048 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4049 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4050 | l2cap_sig_channel(conn, skb); |
4051 | break; | |
4052 | ||
8db4dc46 | 4053 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4054 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4055 | skb_pull(skb, 2); |
4056 | l2cap_conless_channel(conn, psm, skb); | |
4057 | break; | |
4058 | ||
9f69bda6 GP |
4059 | case L2CAP_CID_LE_DATA: |
4060 | l2cap_att_channel(conn, cid, skb); | |
4061 | break; | |
4062 | ||
1da177e4 LT |
4063 | default: |
4064 | l2cap_data_channel(conn, cid, skb); | |
4065 | break; | |
4066 | } | |
4067 | } | |
4068 | ||
4069 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4070 | ||
4071 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4072 | { | |
4073 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4074 | struct l2cap_chan *c; |
1da177e4 LT |
4075 | |
4076 | if (type != ACL_LINK) | |
963cf687 | 4077 | return -EINVAL; |
1da177e4 LT |
4078 | |
4079 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4080 | ||
4081 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4082 | read_lock(&chan_list_lock); |
4083 | list_for_each_entry(c, &chan_list, global_l) { | |
4084 | struct sock *sk = c->sk; | |
4343478f | 4085 | |
89bc500e | 4086 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4087 | continue; |
4088 | ||
4089 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4090 | lm1 |= HCI_LM_ACCEPT; |
23691d75 | 4091 | if (c->role_switch) |
2af6b9d5 | 4092 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4093 | exact++; |
2af6b9d5 MH |
4094 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4095 | lm2 |= HCI_LM_ACCEPT; | |
23691d75 | 4096 | if (c->role_switch) |
2af6b9d5 MH |
4097 | lm2 |= HCI_LM_MASTER; |
4098 | } | |
1da177e4 | 4099 | } |
23691d75 | 4100 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4101 | |
4102 | return exact ? lm1 : lm2; | |
4103 | } | |
4104 | ||
4105 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4106 | { | |
0139418c MH |
4107 | struct l2cap_conn *conn; |
4108 | ||
1da177e4 LT |
4109 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4110 | ||
acd7d370 | 4111 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4112 | return -EINVAL; |
1da177e4 LT |
4113 | |
4114 | if (!status) { | |
1da177e4 LT |
4115 | conn = l2cap_conn_add(hcon, status); |
4116 | if (conn) | |
4117 | l2cap_conn_ready(conn); | |
0139418c | 4118 | } else |
1da177e4 LT |
4119 | l2cap_conn_del(hcon, bt_err(status)); |
4120 | ||
4121 | return 0; | |
4122 | } | |
4123 | ||
2950f21a MH |
4124 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4125 | { | |
4126 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4127 | ||
4128 | BT_DBG("hcon %p", hcon); | |
4129 | ||
b5694506 | 4130 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
2950f21a MH |
4131 | return 0x13; |
4132 | ||
4133 | return conn->disc_reason; | |
4134 | } | |
4135 | ||
4136 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4137 | { |
4138 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4139 | ||
acd7d370 | 4140 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4141 | return -EINVAL; |
1da177e4 LT |
4142 | |
4143 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4144 | |
1da177e4 LT |
4145 | return 0; |
4146 | } | |
4147 | ||
4343478f | 4148 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4149 | { |
715ec005 | 4150 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4151 | return; |
4152 | ||
f62e4323 | 4153 | if (encrypt == 0x00) { |
4343478f | 4154 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 GP |
4155 | __clear_chan_timer(chan); |
4156 | __set_chan_timer(chan, HZ * 5); | |
4343478f | 4157 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4158 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4159 | } else { |
4343478f | 4160 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4161 | __clear_chan_timer(chan); |
f62e4323 MH |
4162 | } |
4163 | } | |
4164 | ||
8c1b2355 | 4165 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4166 | { |
0139418c | 4167 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4168 | struct l2cap_chan *chan; |
1da177e4 | 4169 | |
0139418c | 4170 | if (!conn) |
1da177e4 | 4171 | return 0; |
0139418c | 4172 | |
1da177e4 LT |
4173 | BT_DBG("conn %p", conn); |
4174 | ||
baa7e1fa | 4175 | read_lock(&conn->chan_lock); |
1da177e4 | 4176 | |
baa7e1fa | 4177 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4178 | struct sock *sk = chan->sk; |
baa7e1fa | 4179 | |
1da177e4 LT |
4180 | bh_lock_sock(sk); |
4181 | ||
b4450035 | 4182 | if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { |
6a8d3010 MH |
4183 | bh_unlock_sock(sk); |
4184 | continue; | |
4185 | } | |
4186 | ||
89bc500e GP |
4187 | if (!status && (chan->state == BT_CONNECTED || |
4188 | chan->state == BT_CONFIG)) { | |
4343478f | 4189 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4190 | bh_unlock_sock(sk); |
4191 | continue; | |
4192 | } | |
4193 | ||
89bc500e | 4194 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4195 | if (!status) { |
4196 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4197 | req.scid = cpu_to_le16(chan->scid); |
4198 | req.psm = chan->psm; | |
1da177e4 | 4199 | |
fc7f8a7e | 4200 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 4201 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 4202 | |
fc7f8a7e | 4203 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4204 | L2CAP_CONN_REQ, sizeof(req), &req); |
4205 | } else { | |
c9b66675 GP |
4206 | __clear_chan_timer(chan); |
4207 | __set_chan_timer(chan, HZ / 10); | |
b1235d79 | 4208 | } |
89bc500e | 4209 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 MH |
4210 | struct l2cap_conn_rsp rsp; |
4211 | __u16 result; | |
1da177e4 | 4212 | |
b1235d79 | 4213 | if (!status) { |
89bc500e | 4214 | l2cap_state_change(chan, BT_CONFIG); |
b1235d79 MH |
4215 | result = L2CAP_CR_SUCCESS; |
4216 | } else { | |
89bc500e | 4217 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 4218 | __set_chan_timer(chan, HZ / 10); |
b1235d79 MH |
4219 | result = L2CAP_CR_SEC_BLOCK; |
4220 | } | |
4221 | ||
fe4128e0 GP |
4222 | rsp.scid = cpu_to_le16(chan->dcid); |
4223 | rsp.dcid = cpu_to_le16(chan->scid); | |
b1235d79 | 4224 | rsp.result = cpu_to_le16(result); |
e7c29cb1 | 4225 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
fc7f8a7e GP |
4226 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4227 | sizeof(rsp), &rsp); | |
b1235d79 | 4228 | } |
1da177e4 LT |
4229 | |
4230 | bh_unlock_sock(sk); | |
4231 | } | |
4232 | ||
baa7e1fa | 4233 | read_unlock(&conn->chan_lock); |
b1235d79 | 4234 | |
1da177e4 LT |
4235 | return 0; |
4236 | } | |
4237 | ||
4238 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4239 | { | |
4240 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4241 | ||
5a08ecce AE |
4242 | if (!conn) |
4243 | conn = l2cap_conn_add(hcon, 0); | |
4244 | ||
4245 | if (!conn) | |
1da177e4 LT |
4246 | goto drop; |
4247 | ||
4248 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4249 | ||
e702112f | 4250 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4251 | struct l2cap_hdr *hdr; |
48454079 | 4252 | struct l2cap_chan *chan; |
89794813 | 4253 | u16 cid; |
1da177e4 LT |
4254 | int len; |
4255 | ||
4256 | if (conn->rx_len) { | |
4257 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4258 | kfree_skb(conn->rx_skb); | |
4259 | conn->rx_skb = NULL; | |
4260 | conn->rx_len = 0; | |
4261 | l2cap_conn_unreliable(conn, ECOMM); | |
4262 | } | |
4263 | ||
aae7fe22 AE |
4264 | /* Start fragment always begin with Basic L2CAP header */ |
4265 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4266 | BT_ERR("Frame is too short (len %d)", skb->len); |
4267 | l2cap_conn_unreliable(conn, ECOMM); | |
4268 | goto drop; | |
4269 | } | |
4270 | ||
4271 | hdr = (struct l2cap_hdr *) skb->data; | |
4272 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4273 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4274 | |
4275 | if (len == skb->len) { | |
4276 | /* Complete frame received */ | |
4277 | l2cap_recv_frame(conn, skb); | |
4278 | return 0; | |
4279 | } | |
4280 | ||
4281 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4282 | ||
4283 | if (skb->len > len) { | |
4284 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4285 | skb->len, len); | |
4286 | l2cap_conn_unreliable(conn, ECOMM); | |
4287 | goto drop; | |
4288 | } | |
4289 | ||
baa7e1fa | 4290 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4291 | |
48454079 GP |
4292 | if (chan && chan->sk) { |
4293 | struct sock *sk = chan->sk; | |
89794813 | 4294 | |
0c1bc5c6 | 4295 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4296 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4297 | "MTU %d)", len, | |
0c1bc5c6 | 4298 | chan->imtu); |
48454079 GP |
4299 | bh_unlock_sock(sk); |
4300 | l2cap_conn_unreliable(conn, ECOMM); | |
4301 | goto drop; | |
4302 | } | |
89794813 | 4303 | bh_unlock_sock(sk); |
48454079 | 4304 | } |
89794813 | 4305 | |
1da177e4 | 4306 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4307 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4308 | if (!conn->rx_skb) | |
1da177e4 LT |
4309 | goto drop; |
4310 | ||
d626f62b | 4311 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4312 | skb->len); |
1da177e4 LT |
4313 | conn->rx_len = len - skb->len; |
4314 | } else { | |
4315 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4316 | ||
4317 | if (!conn->rx_len) { | |
4318 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4319 | l2cap_conn_unreliable(conn, ECOMM); | |
4320 | goto drop; | |
4321 | } | |
4322 | ||
4323 | if (skb->len > conn->rx_len) { | |
4324 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4325 | skb->len, conn->rx_len); | |
4326 | kfree_skb(conn->rx_skb); | |
4327 | conn->rx_skb = NULL; | |
4328 | conn->rx_len = 0; | |
4329 | l2cap_conn_unreliable(conn, ECOMM); | |
4330 | goto drop; | |
4331 | } | |
4332 | ||
d626f62b | 4333 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4334 | skb->len); |
1da177e4 LT |
4335 | conn->rx_len -= skb->len; |
4336 | ||
4337 | if (!conn->rx_len) { | |
4338 | /* Complete frame received */ | |
4339 | l2cap_recv_frame(conn, conn->rx_skb); | |
4340 | conn->rx_skb = NULL; | |
4341 | } | |
4342 | } | |
4343 | ||
4344 | drop: | |
4345 | kfree_skb(skb); | |
4346 | return 0; | |
4347 | } | |
4348 | ||
aef7d97c | 4349 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4350 | { |
23691d75 | 4351 | struct l2cap_chan *c; |
1da177e4 | 4352 | |
23691d75 | 4353 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4354 | |
23691d75 GP |
4355 | list_for_each_entry(c, &chan_list, global_l) { |
4356 | struct sock *sk = c->sk; | |
101545f6 | 4357 | |
903d343e | 4358 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4359 | batostr(&bt_sk(sk)->src), |
4360 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4361 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4362 | c->scid, c->dcid, c->imtu, c->omtu, |
4363 | c->sec_level, c->mode); | |
be9d1227 | 4364 | } |
1da177e4 | 4365 | |
23691d75 | 4366 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4367 | |
aef7d97c | 4368 | return 0; |
1da177e4 LT |
4369 | } |
4370 | ||
aef7d97c MH |
4371 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4372 | { | |
4373 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4374 | } | |
4375 | ||
4376 | static const struct file_operations l2cap_debugfs_fops = { | |
4377 | .open = l2cap_debugfs_open, | |
4378 | .read = seq_read, | |
4379 | .llseek = seq_lseek, | |
4380 | .release = single_release, | |
4381 | }; | |
4382 | ||
4383 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4384 | |
1da177e4 LT |
4385 | static struct hci_proto l2cap_hci_proto = { |
4386 | .name = "L2CAP", | |
4387 | .id = HCI_PROTO_L2CAP, | |
4388 | .connect_ind = l2cap_connect_ind, | |
4389 | .connect_cfm = l2cap_connect_cfm, | |
4390 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4391 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4392 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4393 | .recv_acldata = l2cap_recv_acldata |
4394 | }; | |
4395 | ||
64274518 | 4396 | int __init l2cap_init(void) |
1da177e4 LT |
4397 | { |
4398 | int err; | |
be9d1227 | 4399 | |
bb58f747 | 4400 | err = l2cap_init_sockets(); |
1da177e4 LT |
4401 | if (err < 0) |
4402 | return err; | |
4403 | ||
1890d36b | 4404 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4405 | if (!_busy_wq) { |
bb58f747 | 4406 | err = -ENOMEM; |
1da177e4 LT |
4407 | goto error; |
4408 | } | |
4409 | ||
4410 | err = hci_register_proto(&l2cap_hci_proto); | |
4411 | if (err < 0) { | |
4412 | BT_ERR("L2CAP protocol registration failed"); | |
4413 | bt_sock_unregister(BTPROTO_L2CAP); | |
4414 | goto error; | |
4415 | } | |
4416 | ||
aef7d97c MH |
4417 | if (bt_debugfs) { |
4418 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4419 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4420 | if (!l2cap_debugfs) | |
4421 | BT_ERR("Failed to create L2CAP debug file"); | |
4422 | } | |
1da177e4 | 4423 | |
1da177e4 LT |
4424 | return 0; |
4425 | ||
4426 | error: | |
b78d7b4f | 4427 | destroy_workqueue(_busy_wq); |
bb58f747 | 4428 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4429 | return err; |
4430 | } | |
4431 | ||
64274518 | 4432 | void l2cap_exit(void) |
1da177e4 | 4433 | { |
aef7d97c | 4434 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4435 | |
1890d36b GP |
4436 | flush_workqueue(_busy_wq); |
4437 | destroy_workqueue(_busy_wq); | |
4438 | ||
1da177e4 LT |
4439 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4440 | BT_ERR("L2CAP protocol unregistration failed"); | |
4441 | ||
bb58f747 | 4442 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4443 | } |
4444 | ||
d1c4a17d GP |
4445 | module_param(disable_ertm, bool, 0644); |
4446 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |