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. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
1da177e4 LT |
7 | |
8 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License version 2 as | |
12 | published by the Free Software Foundation; | |
13 | ||
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
15 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
17 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
18 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
21 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
22 | ||
8e87d142 YH |
23 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
24 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
25 | SOFTWARE IS DISCLAIMED. |
26 | */ | |
27 | ||
bb58f747 | 28 | /* Bluetooth L2CAP core. */ |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <linux/module.h> |
31 | ||
32 | #include <linux/types.h> | |
4fc268d2 | 33 | #include <linux/capability.h> |
1da177e4 LT |
34 | #include <linux/errno.h> |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #include <linux/sched.h> |
37 | #include <linux/slab.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/fcntl.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/interrupt.h> | |
42 | #include <linux/socket.h> | |
43 | #include <linux/skbuff.h> | |
1da177e4 | 44 | #include <linux/list.h> |
be9d1227 | 45 | #include <linux/device.h> |
aef7d97c MH |
46 | #include <linux/debugfs.h> |
47 | #include <linux/seq_file.h> | |
af05b30b | 48 | #include <linux/uaccess.h> |
fcc203c3 | 49 | #include <linux/crc16.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | ||
52 | #include <asm/system.h> | |
1da177e4 LT |
53 | #include <asm/unaligned.h> |
54 | ||
55 | #include <net/bluetooth/bluetooth.h> | |
56 | #include <net/bluetooth/hci_core.h> | |
57 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 58 | #include <net/bluetooth/smp.h> |
1da177e4 | 59 | |
bb58f747 | 60 | int disable_ertm; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 63 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
74 | struct l2cap_chan *chan, int err); | |
1da177e4 | 75 | |
218bb9df GP |
76 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
77 | ||
0139418c | 78 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
79 | |
80 | static inline void chan_hold(struct l2cap_chan *c) | |
81 | { | |
82 | atomic_inc(&c->refcnt); | |
83 | } | |
84 | ||
85 | static inline void chan_put(struct l2cap_chan *c) | |
86 | { | |
87 | if (atomic_dec_and_test(&c->refcnt)) | |
88 | kfree(c); | |
89 | } | |
90 | ||
baa7e1fa | 91 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 92 | { |
3d57dc68 | 93 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 94 | |
3d57dc68 GP |
95 | rcu_read_lock(); |
96 | ||
97 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
98 | if (c->dcid == cid) { | |
99 | r = c; | |
100 | break; | |
101 | } | |
0139418c | 102 | } |
3d57dc68 GP |
103 | |
104 | rcu_read_unlock(); | |
105 | return r; | |
0139418c MH |
106 | } |
107 | ||
baa7e1fa | 108 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 109 | { |
3d57dc68 | 110 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 111 | |
3d57dc68 GP |
112 | rcu_read_lock(); |
113 | ||
114 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
115 | if (c->scid == cid) { | |
116 | r = c; | |
117 | break; | |
118 | } | |
0139418c | 119 | } |
3d57dc68 GP |
120 | |
121 | rcu_read_unlock(); | |
122 | return r; | |
0139418c MH |
123 | } |
124 | ||
125 | /* Find channel with given SCID. | |
126 | * Returns locked socket */ | |
baa7e1fa | 127 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 128 | { |
48454079 | 129 | struct l2cap_chan *c; |
baa7e1fa | 130 | |
baa7e1fa | 131 | c = __l2cap_get_chan_by_scid(conn, cid); |
48454079 | 132 | if (c) |
aa2ac881 | 133 | lock_sock(c->sk); |
48454079 | 134 | return c; |
0139418c MH |
135 | } |
136 | ||
baa7e1fa | 137 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 138 | { |
3d57dc68 | 139 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 140 | |
3d57dc68 GP |
141 | rcu_read_lock(); |
142 | ||
143 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
144 | if (c->ident == ident) { | |
145 | r = c; | |
146 | break; | |
147 | } | |
0139418c | 148 | } |
3d57dc68 GP |
149 | |
150 | rcu_read_unlock(); | |
151 | return r; | |
0139418c MH |
152 | } |
153 | ||
baa7e1fa | 154 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 155 | { |
48454079 | 156 | struct l2cap_chan *c; |
baa7e1fa | 157 | |
baa7e1fa | 158 | c = __l2cap_get_chan_by_ident(conn, ident); |
48454079 | 159 | if (c) |
aa2ac881 | 160 | lock_sock(c->sk); |
48454079 | 161 | return c; |
0139418c MH |
162 | } |
163 | ||
23691d75 | 164 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 165 | { |
23691d75 | 166 | struct l2cap_chan *c; |
9e4425ff | 167 | |
23691d75 GP |
168 | list_for_each_entry(c, &chan_list, global_l) { |
169 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 170 | return c; |
9e4425ff | 171 | } |
250938cb | 172 | return NULL; |
9e4425ff GP |
173 | } |
174 | ||
175 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
176 | { | |
73b2ec18 GP |
177 | int err; |
178 | ||
23691d75 | 179 | write_lock_bh(&chan_list_lock); |
9e4425ff | 180 | |
23691d75 | 181 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
182 | err = -EADDRINUSE; |
183 | goto done; | |
9e4425ff GP |
184 | } |
185 | ||
73b2ec18 GP |
186 | if (psm) { |
187 | chan->psm = psm; | |
188 | chan->sport = psm; | |
189 | err = 0; | |
190 | } else { | |
191 | u16 p; | |
192 | ||
193 | err = -EINVAL; | |
194 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 195 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
196 | chan->psm = cpu_to_le16(p); |
197 | chan->sport = cpu_to_le16(p); | |
198 | err = 0; | |
199 | break; | |
200 | } | |
201 | } | |
9e4425ff | 202 | |
73b2ec18 | 203 | done: |
23691d75 | 204 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 205 | return err; |
9e4425ff GP |
206 | } |
207 | ||
208 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
209 | { | |
23691d75 | 210 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
211 | |
212 | chan->scid = scid; | |
213 | ||
23691d75 | 214 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
baa7e1fa | 219 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 220 | { |
8db4dc46 | 221 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 222 | |
8db4dc46 | 223 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 224 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
225 | return cid; |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
badaaa00 GP |
231 | static char *state_to_string(int state) |
232 | { | |
233 | switch(state) { | |
234 | case BT_CONNECTED: | |
235 | return "BT_CONNECTED"; | |
236 | case BT_OPEN: | |
237 | return "BT_OPEN"; | |
238 | case BT_BOUND: | |
239 | return "BT_BOUND"; | |
240 | case BT_LISTEN: | |
241 | return "BT_LISTEN"; | |
242 | case BT_CONNECT: | |
243 | return "BT_CONNECT"; | |
244 | case BT_CONNECT2: | |
245 | return "BT_CONNECT2"; | |
246 | case BT_CONFIG: | |
247 | return "BT_CONFIG"; | |
248 | case BT_DISCONN: | |
249 | return "BT_DISCONN"; | |
250 | case BT_CLOSED: | |
251 | return "BT_CLOSED"; | |
252 | } | |
253 | ||
254 | return "invalid state"; | |
255 | } | |
256 | ||
89bc500e GP |
257 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
258 | { | |
badaaa00 GP |
259 | BT_DBG("%p %s -> %s", chan, state_to_string(chan->state), |
260 | state_to_string(state)); | |
261 | ||
89bc500e GP |
262 | chan->state = state; |
263 | chan->ops->state_change(chan->data, state); | |
264 | } | |
265 | ||
721c4181 | 266 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 267 | { |
721c4181 GP |
268 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
269 | chan_timer.work); | |
ab07801d GP |
270 | struct sock *sk = chan->sk; |
271 | int reason; | |
272 | ||
89bc500e | 273 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 274 | |
721c4181 | 275 | lock_sock(sk); |
ab07801d | 276 | |
89bc500e | 277 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 278 | reason = ECONNREFUSED; |
89bc500e | 279 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
280 | chan->sec_level != BT_SECURITY_SDP) |
281 | reason = ECONNREFUSED; | |
282 | else | |
283 | reason = ETIMEDOUT; | |
284 | ||
0f852724 | 285 | l2cap_chan_close(chan, reason); |
ab07801d | 286 | |
721c4181 | 287 | release_sock(sk); |
ab07801d | 288 | |
ba3bd0ee | 289 | chan->ops->close(chan->data); |
71ba0e56 | 290 | chan_put(chan); |
ab07801d GP |
291 | } |
292 | ||
23691d75 | 293 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
294 | { |
295 | struct l2cap_chan *chan; | |
296 | ||
297 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
298 | if (!chan) | |
299 | return NULL; | |
300 | ||
301 | chan->sk = sk; | |
302 | ||
23691d75 GP |
303 | write_lock_bh(&chan_list_lock); |
304 | list_add(&chan->global_l, &chan_list); | |
305 | write_unlock_bh(&chan_list_lock); | |
306 | ||
721c4181 | 307 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 308 | |
89bc500e GP |
309 | chan->state = BT_OPEN; |
310 | ||
71ba0e56 GP |
311 | atomic_set(&chan->refcnt, 1); |
312 | ||
abc545b8 SJ |
313 | BT_DBG("sk %p chan %p", sk, chan); |
314 | ||
48454079 GP |
315 | return chan; |
316 | } | |
317 | ||
23691d75 | 318 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 319 | { |
23691d75 GP |
320 | write_lock_bh(&chan_list_lock); |
321 | list_del(&chan->global_l); | |
322 | write_unlock_bh(&chan_list_lock); | |
323 | ||
71ba0e56 | 324 | chan_put(chan); |
6ff5abbf GP |
325 | } |
326 | ||
3d57dc68 | 327 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 328 | { |
af05b30b | 329 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 330 | chan->psm, chan->dcid); |
0139418c | 331 | |
9f5a0d7b | 332 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 333 | |
8c1d787b | 334 | chan->conn = conn; |
0139418c | 335 | |
715ec005 | 336 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
337 | if (conn->hcon->type == LE_LINK) { |
338 | /* LE connection */ | |
0c1bc5c6 | 339 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
340 | chan->scid = L2CAP_CID_LE_DATA; |
341 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
342 | } else { |
343 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 344 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 345 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 346 | } |
715ec005 | 347 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 348 | /* Connectionless socket */ |
fe4128e0 GP |
349 | chan->scid = L2CAP_CID_CONN_LESS; |
350 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 351 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
352 | } else { |
353 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
354 | chan->scid = L2CAP_CID_SIGNALING; |
355 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 356 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
357 | } |
358 | ||
8f7975b1 AE |
359 | chan->local_id = L2CAP_BESTEFFORT_ID; |
360 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
361 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
362 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
363 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
364 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
365 | ||
71ba0e56 | 366 | chan_hold(chan); |
baa7e1fa | 367 | |
3d57dc68 | 368 | list_add_rcu(&chan->list, &conn->chan_l); |
0139418c MH |
369 | } |
370 | ||
8e87d142 | 371 | /* Delete channel. |
0139418c | 372 | * Must be called on the locked socket. */ |
4519de9a | 373 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 374 | { |
48454079 | 375 | struct sock *sk = chan->sk; |
8c1d787b | 376 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
377 | struct sock *parent = bt_sk(sk)->parent; |
378 | ||
c9b66675 | 379 | __clear_chan_timer(chan); |
0139418c | 380 | |
49208c9c | 381 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 382 | |
8e87d142 | 383 | if (conn) { |
baa7e1fa | 384 | /* Delete from channel list */ |
3d57dc68 GP |
385 | list_del_rcu(&chan->list); |
386 | synchronize_rcu(); | |
387 | ||
71ba0e56 | 388 | chan_put(chan); |
baa7e1fa | 389 | |
8c1d787b | 390 | chan->conn = NULL; |
0139418c MH |
391 | hci_conn_put(conn->hcon); |
392 | } | |
393 | ||
89bc500e | 394 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
395 | sock_set_flag(sk, SOCK_ZAPPED); |
396 | ||
397 | if (err) | |
398 | sk->sk_err = err; | |
399 | ||
400 | if (parent) { | |
401 | bt_accept_unlink(sk); | |
402 | parent->sk_data_ready(parent, 0); | |
403 | } else | |
404 | sk->sk_state_change(sk); | |
c13ffa62 | 405 | |
c1360a1c GP |
406 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
407 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 408 | return; |
2ead70b8 | 409 | |
58d35f87 | 410 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 411 | |
0c1bc5c6 | 412 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
413 | struct srej_list *l, *tmp; |
414 | ||
1a09bcb9 GP |
415 | __clear_retrans_timer(chan); |
416 | __clear_monitor_timer(chan); | |
417 | __clear_ack_timer(chan); | |
c13ffa62 | 418 | |
f1c6775b | 419 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 420 | |
39d5a3ee | 421 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
422 | list_del(&l->list); |
423 | kfree(l); | |
424 | } | |
425 | } | |
0139418c MH |
426 | } |
427 | ||
4519de9a GP |
428 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
429 | { | |
430 | struct sock *sk; | |
431 | ||
432 | BT_DBG("parent %p", parent); | |
433 | ||
434 | /* Close not yet accepted channels */ | |
0f852724 | 435 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 436 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 437 | __clear_chan_timer(chan); |
0f852724 | 438 | lock_sock(sk); |
ba3bd0ee | 439 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 440 | release_sock(sk); |
ba3bd0ee | 441 | chan->ops->close(chan->data); |
0f852724 | 442 | } |
4519de9a GP |
443 | } |
444 | ||
0f852724 | 445 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
446 | { |
447 | struct l2cap_conn *conn = chan->conn; | |
448 | struct sock *sk = chan->sk; | |
449 | ||
89bc500e | 450 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 451 | |
89bc500e | 452 | switch (chan->state) { |
4519de9a GP |
453 | case BT_LISTEN: |
454 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
455 | |
456 | l2cap_state_change(chan, BT_CLOSED); | |
457 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
458 | break; |
459 | ||
460 | case BT_CONNECTED: | |
461 | case BT_CONFIG: | |
715ec005 | 462 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 463 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
464 | __clear_chan_timer(chan); |
465 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
466 | l2cap_send_disconn_req(conn, chan, reason); |
467 | } else | |
468 | l2cap_chan_del(chan, reason); | |
469 | break; | |
470 | ||
471 | case BT_CONNECT2: | |
715ec005 | 472 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
473 | conn->hcon->type == ACL_LINK) { |
474 | struct l2cap_conn_rsp rsp; | |
475 | __u16 result; | |
476 | ||
477 | if (bt_sk(sk)->defer_setup) | |
478 | result = L2CAP_CR_SEC_BLOCK; | |
479 | else | |
480 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 481 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
482 | |
483 | rsp.scid = cpu_to_le16(chan->dcid); | |
484 | rsp.dcid = cpu_to_le16(chan->scid); | |
485 | rsp.result = cpu_to_le16(result); | |
486 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
487 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
488 | sizeof(rsp), &rsp); | |
489 | } | |
490 | ||
491 | l2cap_chan_del(chan, reason); | |
492 | break; | |
493 | ||
494 | case BT_CONNECT: | |
495 | case BT_DISCONN: | |
496 | l2cap_chan_del(chan, reason); | |
497 | break; | |
498 | ||
499 | default: | |
500 | sock_set_flag(sk, SOCK_ZAPPED); | |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
4343478f | 505 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 506 | { |
715ec005 | 507 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 508 | switch (chan->sec_level) { |
8556edd3 JH |
509 | case BT_SECURITY_HIGH: |
510 | return HCI_AT_DEDICATED_BONDING_MITM; | |
511 | case BT_SECURITY_MEDIUM: | |
512 | return HCI_AT_DEDICATED_BONDING; | |
513 | default: | |
514 | return HCI_AT_NO_BONDING; | |
515 | } | |
fe4128e0 | 516 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
517 | if (chan->sec_level == BT_SECURITY_LOW) |
518 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 519 | |
4343478f | 520 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 521 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 522 | else |
8556edd3 | 523 | return HCI_AT_NO_BONDING; |
00ae4af9 | 524 | } else { |
4343478f | 525 | switch (chan->sec_level) { |
00ae4af9 | 526 | case BT_SECURITY_HIGH: |
8556edd3 | 527 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 528 | case BT_SECURITY_MEDIUM: |
8556edd3 | 529 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 530 | default: |
8556edd3 | 531 | return HCI_AT_NO_BONDING; |
00ae4af9 | 532 | } |
0684e5f9 | 533 | } |
8556edd3 JH |
534 | } |
535 | ||
536 | /* Service level security */ | |
d45fc423 | 537 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 538 | { |
8c1d787b | 539 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
540 | __u8 auth_type; |
541 | ||
4343478f | 542 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 543 | |
4343478f | 544 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
545 | } |
546 | ||
b5ad8b7f | 547 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
548 | { |
549 | u8 id; | |
550 | ||
551 | /* Get next available identificator. | |
552 | * 1 - 128 are used by kernel. | |
553 | * 129 - 199 are reserved. | |
554 | * 200 - 254 are used by utilities like l2ping, etc. | |
555 | */ | |
556 | ||
557 | spin_lock_bh(&conn->lock); | |
558 | ||
559 | if (++conn->tx_ident > 128) | |
560 | conn->tx_ident = 1; | |
561 | ||
562 | id = conn->tx_ident; | |
563 | ||
564 | spin_unlock_bh(&conn->lock); | |
565 | ||
566 | return id; | |
567 | } | |
568 | ||
4519de9a | 569 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
570 | { |
571 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 572 | u8 flags; |
4e8402a3 MH |
573 | |
574 | BT_DBG("code 0x%2.2x", code); | |
575 | ||
576 | if (!skb) | |
9a9c6a34 | 577 | return; |
4e8402a3 | 578 | |
e702112f AE |
579 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
580 | flags = ACL_START_NO_FLUSH; | |
581 | else | |
582 | flags = ACL_START; | |
583 | ||
14b12d0b | 584 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 585 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 586 | |
73d80deb LAD |
587 | hci_send_acl(conn->hchan, skb, flags); |
588 | } | |
589 | ||
590 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
591 | { | |
592 | struct hci_conn *hcon = chan->conn->hcon; | |
593 | u16 flags; | |
594 | ||
595 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
596 | skb->priority); | |
597 | ||
598 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
599 | lmp_no_flush_capable(hcon->hdev)) | |
600 | flags = ACL_START_NO_FLUSH; | |
601 | else | |
602 | flags = ACL_START; | |
14b12d0b | 603 | |
73d80deb LAD |
604 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
605 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
606 | } |
607 | ||
88843ab0 | 608 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
1c2acffb GP |
609 | { |
610 | struct sk_buff *skb; | |
611 | struct l2cap_hdr *lh; | |
8c1d787b | 612 | struct l2cap_conn *conn = chan->conn; |
e4ca6d98 | 613 | int count, hlen; |
fcc203c3 | 614 | |
89bc500e | 615 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
616 | return; |
617 | ||
e4ca6d98 AE |
618 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
619 | hlen = L2CAP_EXT_HDR_SIZE; | |
620 | else | |
621 | hlen = L2CAP_ENH_HDR_SIZE; | |
622 | ||
47d1ec61 | 623 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 624 | hlen += L2CAP_FCS_SIZE; |
1c2acffb | 625 | |
88843ab0 | 626 | BT_DBG("chan %p, control 0x%8.8x", chan, control); |
1c2acffb | 627 | |
fcc203c3 | 628 | count = min_t(unsigned int, conn->mtu, hlen); |
793c2f1c AE |
629 | |
630 | control |= __set_sframe(chan); | |
1c2acffb | 631 | |
e2ab4353 | 632 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 633 | control |= __set_ctrl_final(chan); |
9e917af1 | 634 | |
e2ab4353 | 635 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
e3781735 | 636 | control |= __set_ctrl_poll(chan); |
f0946ccf | 637 | |
1c2acffb GP |
638 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
639 | if (!skb) | |
9a9c6a34 | 640 | return; |
1c2acffb GP |
641 | |
642 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 643 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 644 | lh->cid = cpu_to_le16(chan->dcid); |
88843ab0 AE |
645 | |
646 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1c2acffb | 647 | |
47d1ec61 | 648 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
649 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); |
650 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
651 | } |
652 | ||
73d80deb LAD |
653 | skb->priority = HCI_PRIO_MAX; |
654 | l2cap_do_send(chan, skb); | |
1c2acffb GP |
655 | } |
656 | ||
88843ab0 | 657 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) |
7e743090 | 658 | { |
e2ab4353 | 659 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 660 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 661 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 662 | } else |
ab784b73 | 663 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 664 | |
0b209fae | 665 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 666 | |
525cd185 | 667 | l2cap_send_sframe(chan, control); |
7e743090 GP |
668 | } |
669 | ||
b4450035 | 670 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 671 | { |
c1360a1c | 672 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
673 | } |
674 | ||
fc7f8a7e | 675 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 676 | { |
8c1d787b | 677 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
678 | |
679 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
680 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
681 | return; | |
682 | ||
d45fc423 | 683 | if (l2cap_chan_check_security(chan) && |
4343478f | 684 | __l2cap_no_conn_pending(chan)) { |
b1235d79 | 685 | struct l2cap_conn_req req; |
fe4128e0 GP |
686 | req.scid = cpu_to_le16(chan->scid); |
687 | req.psm = chan->psm; | |
79d554a6 | 688 | |
fc7f8a7e | 689 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 690 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 691 | |
fc7f8a7e GP |
692 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
693 | sizeof(req), &req); | |
b1235d79 | 694 | } |
79d554a6 MH |
695 | } else { |
696 | struct l2cap_info_req req; | |
697 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
698 | ||
699 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
700 | conn->info_ident = l2cap_get_ident(conn); | |
701 | ||
f878fcad | 702 | schedule_delayed_work(&conn->info_work, |
79d554a6 MH |
703 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
704 | ||
705 | l2cap_send_cmd(conn, conn->info_ident, | |
706 | L2CAP_INFO_REQ, sizeof(req), &req); | |
707 | } | |
708 | } | |
709 | ||
cf6c2c0b GP |
710 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
711 | { | |
712 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 713 | if (!disable_ertm) |
cf6c2c0b GP |
714 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
715 | ||
716 | switch (mode) { | |
717 | case L2CAP_MODE_ERTM: | |
718 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
719 | case L2CAP_MODE_STREAMING: | |
720 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
721 | default: | |
722 | return 0x00; | |
723 | } | |
724 | } | |
725 | ||
4519de9a | 726 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 727 | { |
e92c8e70 | 728 | struct sock *sk; |
22121fc9 GP |
729 | struct l2cap_disconn_req req; |
730 | ||
c13ffa62 GP |
731 | if (!conn) |
732 | return; | |
733 | ||
e92c8e70 GP |
734 | sk = chan->sk; |
735 | ||
0c1bc5c6 | 736 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
737 | __clear_retrans_timer(chan); |
738 | __clear_monitor_timer(chan); | |
739 | __clear_ack_timer(chan); | |
c13ffa62 GP |
740 | } |
741 | ||
fe4128e0 GP |
742 | req.dcid = cpu_to_le16(chan->dcid); |
743 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
744 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
745 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 746 | |
89bc500e | 747 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 748 | sk->sk_err = err; |
22121fc9 GP |
749 | } |
750 | ||
1da177e4 | 751 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
752 | static void l2cap_conn_start(struct l2cap_conn *conn) |
753 | { | |
3d57dc68 | 754 | struct l2cap_chan *chan; |
4e8402a3 MH |
755 | |
756 | BT_DBG("conn %p", conn); | |
757 | ||
3d57dc68 | 758 | rcu_read_lock(); |
4e8402a3 | 759 | |
3d57dc68 | 760 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 761 | struct sock *sk = chan->sk; |
baa7e1fa | 762 | |
4e8402a3 MH |
763 | bh_lock_sock(sk); |
764 | ||
715ec005 | 765 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
766 | bh_unlock_sock(sk); |
767 | continue; | |
768 | } | |
769 | ||
89bc500e | 770 | if (chan->state == BT_CONNECT) { |
47731de7 | 771 | struct l2cap_conn_req req; |
79d554a6 | 772 | |
d45fc423 | 773 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 774 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
775 | bh_unlock_sock(sk); |
776 | continue; | |
777 | } | |
79d554a6 | 778 | |
c1360a1c GP |
779 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
780 | && test_bit(CONF_STATE2_DEVICE, | |
781 | &chan->conf_state)) { | |
0f852724 | 782 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 783 | * so release the lock */ |
89bc500e | 784 | l2cap_chan_close(chan, ECONNRESET); |
47731de7 GP |
785 | bh_unlock_sock(sk); |
786 | continue; | |
b1235d79 | 787 | } |
47731de7 | 788 | |
fe4128e0 GP |
789 | req.scid = cpu_to_le16(chan->scid); |
790 | req.psm = chan->psm; | |
47731de7 | 791 | |
fc7f8a7e | 792 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 793 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 794 | |
fc7f8a7e GP |
795 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
796 | sizeof(req), &req); | |
47731de7 | 797 | |
89bc500e | 798 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 799 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 800 | char buf[128]; |
fe4128e0 GP |
801 | rsp.scid = cpu_to_le16(chan->dcid); |
802 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 803 | |
d45fc423 | 804 | if (l2cap_chan_check_security(chan)) { |
f66dc81f MH |
805 | if (bt_sk(sk)->defer_setup) { |
806 | struct sock *parent = bt_sk(sk)->parent; | |
807 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
808 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
809 | if (parent) |
810 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
811 | |
812 | } else { | |
89bc500e | 813 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
814 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
815 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
816 | } | |
79d554a6 MH |
817 | } else { |
818 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
819 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
820 | } | |
821 | ||
fc7f8a7e GP |
822 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
823 | sizeof(rsp), &rsp); | |
e9aeb2dd | 824 | |
c1360a1c | 825 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
826 | rsp.result != L2CAP_CR_SUCCESS) { |
827 | bh_unlock_sock(sk); | |
828 | continue; | |
829 | } | |
830 | ||
c1360a1c | 831 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 832 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
833 | l2cap_build_conf_req(chan, buf), buf); |
834 | chan->num_conf_req++; | |
4e8402a3 MH |
835 | } |
836 | ||
837 | bh_unlock_sock(sk); | |
838 | } | |
839 | ||
3d57dc68 | 840 | rcu_read_unlock(); |
4e8402a3 MH |
841 | } |
842 | ||
b62f328b VT |
843 | /* Find socket with cid and source bdaddr. |
844 | * Returns closest match, locked. | |
845 | */ | |
23691d75 | 846 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 847 | { |
23691d75 | 848 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 849 | |
23691d75 | 850 | read_lock(&chan_list_lock); |
b62f328b | 851 | |
23691d75 GP |
852 | list_for_each_entry(c, &chan_list, global_l) { |
853 | struct sock *sk = c->sk; | |
fe4128e0 | 854 | |
89bc500e | 855 | if (state && c->state != state) |
b62f328b VT |
856 | continue; |
857 | ||
23691d75 | 858 | if (c->scid == cid) { |
b62f328b | 859 | /* Exact match. */ |
23691d75 GP |
860 | if (!bacmp(&bt_sk(sk)->src, src)) { |
861 | read_unlock(&chan_list_lock); | |
862 | return c; | |
863 | } | |
b62f328b VT |
864 | |
865 | /* Closest match */ | |
866 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 867 | c1 = c; |
b62f328b VT |
868 | } |
869 | } | |
280f294f | 870 | |
23691d75 | 871 | read_unlock(&chan_list_lock); |
b62f328b | 872 | |
23691d75 | 873 | return c1; |
b62f328b VT |
874 | } |
875 | ||
876 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
877 | { | |
c916fbe4 | 878 | struct sock *parent, *sk; |
23691d75 | 879 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
880 | |
881 | BT_DBG(""); | |
882 | ||
883 | /* Check if we have socket listening on cid */ | |
23691d75 | 884 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 885 | conn->src); |
23691d75 | 886 | if (!pchan) |
b62f328b VT |
887 | return; |
888 | ||
23691d75 GP |
889 | parent = pchan->sk; |
890 | ||
aa2ac881 | 891 | lock_sock(parent); |
62f3a2cf | 892 | |
b62f328b VT |
893 | /* Check for backlog size */ |
894 | if (sk_acceptq_is_full(parent)) { | |
895 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
896 | goto clean; | |
897 | } | |
898 | ||
80808e43 GP |
899 | chan = pchan->ops->new_connection(pchan->data); |
900 | if (!chan) | |
b62f328b VT |
901 | goto clean; |
902 | ||
80808e43 | 903 | sk = chan->sk; |
5d41ce1d | 904 | |
b62f328b VT |
905 | hci_conn_hold(conn->hcon); |
906 | ||
b62f328b VT |
907 | bacpy(&bt_sk(sk)->src, conn->src); |
908 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
909 | ||
d1010240 GP |
910 | bt_accept_enqueue(parent, sk); |
911 | ||
3d57dc68 | 912 | l2cap_chan_add(conn, chan); |
48454079 | 913 | |
c9b66675 | 914 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 915 | |
89bc500e | 916 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
917 | parent->sk_data_ready(parent, 0); |
918 | ||
b62f328b | 919 | clean: |
aa2ac881 | 920 | release_sock(parent); |
b62f328b VT |
921 | } |
922 | ||
f1cb9af5 VCG |
923 | static void l2cap_chan_ready(struct sock *sk) |
924 | { | |
925 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
926 | struct sock *parent = bt_sk(sk)->parent; | |
927 | ||
928 | BT_DBG("sk %p, parent %p", sk, parent); | |
929 | ||
930 | chan->conf_state = 0; | |
931 | __clear_chan_timer(chan); | |
932 | ||
43f3dc41 | 933 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
934 | sk->sk_state_change(sk); |
935 | ||
936 | if (parent) | |
937 | parent->sk_data_ready(parent, 0); | |
938 | } | |
939 | ||
4e8402a3 MH |
940 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
941 | { | |
48454079 | 942 | struct l2cap_chan *chan; |
4e8402a3 | 943 | |
79d554a6 | 944 | BT_DBG("conn %p", conn); |
4e8402a3 | 945 | |
b62f328b VT |
946 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
947 | l2cap_le_conn_ready(conn); | |
948 | ||
160dc6ac VCG |
949 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
950 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
951 | ||
3d57dc68 | 952 | rcu_read_lock(); |
4e8402a3 | 953 | |
3d57dc68 | 954 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 955 | struct sock *sk = chan->sk; |
baa7e1fa | 956 | |
79d554a6 | 957 | bh_lock_sock(sk); |
4e8402a3 | 958 | |
63128451 | 959 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 960 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 961 | l2cap_chan_ready(sk); |
acd7d370 | 962 | |
63128451 | 963 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 964 | __clear_chan_timer(chan); |
89bc500e | 965 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 966 | sk->sk_state_change(sk); |
b501d6a1 | 967 | |
89bc500e | 968 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 969 | l2cap_do_start(chan); |
4e8402a3 | 970 | |
79d554a6 | 971 | bh_unlock_sock(sk); |
4e8402a3 | 972 | } |
79d554a6 | 973 | |
3d57dc68 | 974 | rcu_read_unlock(); |
4e8402a3 MH |
975 | } |
976 | ||
977 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
978 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
979 | { | |
48454079 | 980 | struct l2cap_chan *chan; |
4e8402a3 MH |
981 | |
982 | BT_DBG("conn %p", conn); | |
983 | ||
3d57dc68 | 984 | rcu_read_lock(); |
4e8402a3 | 985 | |
3d57dc68 | 986 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 987 | struct sock *sk = chan->sk; |
baa7e1fa | 988 | |
ecf61bdb | 989 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
4e8402a3 MH |
990 | sk->sk_err = err; |
991 | } | |
992 | ||
3d57dc68 | 993 | rcu_read_unlock(); |
4e8402a3 MH |
994 | } |
995 | ||
f878fcad | 996 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 997 | { |
f878fcad GP |
998 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
999 | info_work.work); | |
4e8402a3 | 1000 | |
984947dc | 1001 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1002 | conn->info_ident = 0; |
984947dc | 1003 | |
4e8402a3 MH |
1004 | l2cap_conn_start(conn); |
1005 | } | |
1006 | ||
5d3de7df VCG |
1007 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1008 | { | |
1009 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1010 | struct l2cap_chan *chan, *l; | |
1011 | struct sock *sk; | |
1012 | ||
1013 | if (!conn) | |
1014 | return; | |
1015 | ||
1016 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1017 | ||
1018 | kfree_skb(conn->rx_skb); | |
1019 | ||
1020 | /* Kill channels */ | |
1021 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
1022 | sk = chan->sk; | |
aa2ac881 | 1023 | lock_sock(sk); |
5d3de7df | 1024 | l2cap_chan_del(chan, err); |
aa2ac881 | 1025 | release_sock(sk); |
5d3de7df VCG |
1026 | chan->ops->close(chan->data); |
1027 | } | |
1028 | ||
73d80deb LAD |
1029 | hci_chan_del(conn->hchan); |
1030 | ||
5d3de7df | 1031 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
f878fcad | 1032 | cancel_delayed_work_sync(&conn->info_work); |
5d3de7df | 1033 | |
d26a2345 | 1034 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
6c9d42a1 | 1035 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1036 | smp_chan_destroy(conn); |
d26a2345 | 1037 | } |
5d3de7df VCG |
1038 | |
1039 | hcon->l2cap_data = NULL; | |
1040 | kfree(conn); | |
1041 | } | |
1042 | ||
6c9d42a1 | 1043 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1044 | { |
6c9d42a1 GP |
1045 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1046 | security_timer.work); | |
5d3de7df VCG |
1047 | |
1048 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1049 | } | |
1050 | ||
1da177e4 LT |
1051 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1052 | { | |
0139418c | 1053 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1054 | struct hci_chan *hchan; |
1da177e4 | 1055 | |
0139418c | 1056 | if (conn || status) |
1da177e4 LT |
1057 | return conn; |
1058 | ||
73d80deb LAD |
1059 | hchan = hci_chan_create(hcon); |
1060 | if (!hchan) | |
1061 | return NULL; | |
1062 | ||
0139418c | 1063 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1064 | if (!conn) { |
1065 | hci_chan_del(hchan); | |
1da177e4 | 1066 | return NULL; |
73d80deb | 1067 | } |
1da177e4 LT |
1068 | |
1069 | hcon->l2cap_data = conn; | |
1070 | conn->hcon = hcon; | |
73d80deb | 1071 | conn->hchan = hchan; |
1da177e4 | 1072 | |
73d80deb | 1073 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1074 | |
acd7d370 VT |
1075 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1076 | conn->mtu = hcon->hdev->le_mtu; | |
1077 | else | |
1078 | conn->mtu = hcon->hdev->acl_mtu; | |
1079 | ||
1da177e4 LT |
1080 | conn->src = &hcon->hdev->bdaddr; |
1081 | conn->dst = &hcon->dst; | |
1082 | ||
4e8402a3 MH |
1083 | conn->feat_mask = 0; |
1084 | ||
1da177e4 | 1085 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1086 | |
1087 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1088 | |
5d3de7df | 1089 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1090 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1091 | else |
f878fcad | 1092 | INIT_DELAYED_WORK(&conn->info_work, l2cap_info_timeout); |
45054dc1 | 1093 | |
9f5a0d7b | 1094 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1095 | |
1da177e4 LT |
1096 | return conn; |
1097 | } | |
1098 | ||
1da177e4 | 1099 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1100 | |
1101 | /* Find socket with psm and source bdaddr. | |
1102 | * Returns closest match. | |
1103 | */ | |
23691d75 | 1104 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1105 | { |
23691d75 | 1106 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1107 | |
23691d75 | 1108 | read_lock(&chan_list_lock); |
e0f0cb56 | 1109 | |
23691d75 GP |
1110 | list_for_each_entry(c, &chan_list, global_l) { |
1111 | struct sock *sk = c->sk; | |
fe4128e0 | 1112 | |
89bc500e | 1113 | if (state && c->state != state) |
1da177e4 LT |
1114 | continue; |
1115 | ||
23691d75 | 1116 | if (c->psm == psm) { |
1da177e4 | 1117 | /* Exact match. */ |
23691d75 | 1118 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1119 | read_unlock(&chan_list_lock); |
23691d75 GP |
1120 | return c; |
1121 | } | |
1da177e4 LT |
1122 | |
1123 | /* Closest match */ | |
1124 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1125 | c1 = c; |
1da177e4 LT |
1126 | } |
1127 | } | |
1da177e4 | 1128 | |
23691d75 | 1129 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1130 | |
23691d75 | 1131 | return c1; |
1da177e4 LT |
1132 | } |
1133 | ||
03a00194 | 1134 | inline int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst) |
1da177e4 | 1135 | { |
5d41ce1d | 1136 | struct sock *sk = chan->sk; |
1da177e4 | 1137 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1138 | struct l2cap_conn *conn; |
1139 | struct hci_conn *hcon; | |
1140 | struct hci_dev *hdev; | |
09ab6f4c | 1141 | __u8 auth_type; |
44d0e48e | 1142 | int err; |
1da177e4 | 1143 | |
f29972de | 1144 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1145 | chan->psm); |
1da177e4 | 1146 | |
af05b30b GP |
1147 | hdev = hci_get_route(dst, src); |
1148 | if (!hdev) | |
1da177e4 LT |
1149 | return -EHOSTUNREACH; |
1150 | ||
09fd0de5 | 1151 | hci_dev_lock(hdev); |
1da177e4 | 1152 | |
03a00194 GP |
1153 | lock_sock(sk); |
1154 | ||
1155 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1156 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1157 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1158 | err = -EINVAL; | |
1159 | goto done; | |
1160 | } | |
1161 | ||
1162 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1163 | err = -EINVAL; | |
1164 | goto done; | |
1165 | } | |
1166 | ||
1167 | switch (chan->mode) { | |
1168 | case L2CAP_MODE_BASIC: | |
1169 | break; | |
1170 | case L2CAP_MODE_ERTM: | |
1171 | case L2CAP_MODE_STREAMING: | |
1172 | if (!disable_ertm) | |
1173 | break; | |
1174 | /* fall through */ | |
1175 | default: | |
1176 | err = -ENOTSUPP; | |
1177 | goto done; | |
1178 | } | |
1179 | ||
1180 | switch (sk->sk_state) { | |
1181 | case BT_CONNECT: | |
1182 | case BT_CONNECT2: | |
1183 | case BT_CONFIG: | |
1184 | /* Already connecting */ | |
1185 | err = 0; | |
1186 | goto done; | |
1187 | ||
1188 | case BT_CONNECTED: | |
1189 | /* Already connected */ | |
1190 | err = -EISCONN; | |
1191 | goto done; | |
1192 | ||
1193 | case BT_OPEN: | |
1194 | case BT_BOUND: | |
1195 | /* Can connect */ | |
1196 | break; | |
1197 | ||
1198 | default: | |
1199 | err = -EBADFD; | |
1200 | goto done; | |
1201 | } | |
1202 | ||
1203 | /* Set destination address and psm */ | |
1204 | bacpy(&bt_sk(sk)->dst, src); | |
1205 | chan->psm = psm; | |
1206 | chan->dcid = cid; | |
1207 | ||
4343478f | 1208 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1209 | |
fe4128e0 | 1210 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1211 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1212 | chan->sec_level, auth_type); |
acd7d370 VT |
1213 | else |
1214 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1215 | chan->sec_level, auth_type); |
acd7d370 | 1216 | |
30e76272 VT |
1217 | if (IS_ERR(hcon)) { |
1218 | err = PTR_ERR(hcon); | |
1da177e4 | 1219 | goto done; |
30e76272 | 1220 | } |
1da177e4 LT |
1221 | |
1222 | conn = l2cap_conn_add(hcon, 0); | |
1223 | if (!conn) { | |
1224 | hci_conn_put(hcon); | |
30e76272 | 1225 | err = -ENOMEM; |
1da177e4 LT |
1226 | goto done; |
1227 | } | |
1228 | ||
1da177e4 LT |
1229 | /* Update source addr of the socket */ |
1230 | bacpy(src, conn->src); | |
1231 | ||
48454079 GP |
1232 | l2cap_chan_add(conn, chan); |
1233 | ||
89bc500e | 1234 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1235 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1236 | |
1237 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1238 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1239 | __clear_chan_timer(chan); |
d45fc423 | 1240 | if (l2cap_chan_check_security(chan)) |
89bc500e | 1241 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1242 | } else |
fc7f8a7e | 1243 | l2cap_do_start(chan); |
1da177e4 LT |
1244 | } |
1245 | ||
30e76272 VT |
1246 | err = 0; |
1247 | ||
1da177e4 | 1248 | done: |
09fd0de5 | 1249 | hci_dev_unlock(hdev); |
1da177e4 LT |
1250 | hci_dev_put(hdev); |
1251 | return err; | |
1252 | } | |
1253 | ||
dcba0dba | 1254 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1255 | { |
8c1d787b | 1256 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1257 | DECLARE_WAITQUEUE(wait, current); |
1258 | int err = 0; | |
1259 | int timeo = HZ/5; | |
1260 | ||
2b0b05dd | 1261 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1262 | set_current_state(TASK_INTERRUPTIBLE); |
1263 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1264 | if (!timeo) |
1265 | timeo = HZ/5; | |
1266 | ||
1267 | if (signal_pending(current)) { | |
1268 | err = sock_intr_errno(timeo); | |
1269 | break; | |
1270 | } | |
1271 | ||
1272 | release_sock(sk); | |
1273 | timeo = schedule_timeout(timeo); | |
1274 | lock_sock(sk); | |
a71a0cf4 | 1275 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1276 | |
1277 | err = sock_error(sk); | |
1278 | if (err) | |
1279 | break; | |
1280 | } | |
1281 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1282 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1283 | return err; |
1284 | } | |
1285 | ||
721c4181 | 1286 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1287 | { |
721c4181 GP |
1288 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1289 | monitor_timer.work); | |
525cd185 | 1290 | struct sock *sk = chan->sk; |
e90bac06 | 1291 | |
525cd185 | 1292 | BT_DBG("chan %p", chan); |
0e98958d | 1293 | |
721c4181 | 1294 | lock_sock(sk); |
2c03a7a4 | 1295 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1296 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
721c4181 | 1297 | release_sock(sk); |
e90bac06 GP |
1298 | return; |
1299 | } | |
1300 | ||
6a026610 | 1301 | chan->retry_count++; |
1a09bcb9 | 1302 | __set_monitor_timer(chan); |
e90bac06 | 1303 | |
525cd185 | 1304 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
721c4181 | 1305 | release_sock(sk); |
e90bac06 GP |
1306 | } |
1307 | ||
721c4181 | 1308 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1309 | { |
721c4181 GP |
1310 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1311 | retrans_timer.work); | |
525cd185 | 1312 | struct sock *sk = chan->sk; |
e90bac06 | 1313 | |
49208c9c | 1314 | BT_DBG("chan %p", chan); |
0e98958d | 1315 | |
721c4181 | 1316 | lock_sock(sk); |
6a026610 | 1317 | chan->retry_count = 1; |
1a09bcb9 | 1318 | __set_monitor_timer(chan); |
e90bac06 | 1319 | |
e2ab4353 | 1320 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1321 | |
525cd185 | 1322 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
721c4181 | 1323 | release_sock(sk); |
e90bac06 GP |
1324 | } |
1325 | ||
42e5c802 | 1326 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1327 | { |
1c2acffb | 1328 | struct sk_buff *skb; |
1da177e4 | 1329 | |
58d35f87 | 1330 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1331 | chan->unacked_frames) { |
42e5c802 | 1332 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1333 | break; |
1da177e4 | 1334 | |
58d35f87 | 1335 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1336 | kfree_skb(skb); |
1da177e4 | 1337 | |
6a026610 | 1338 | chan->unacked_frames--; |
1c2acffb | 1339 | } |
1da177e4 | 1340 | |
6a026610 | 1341 | if (!chan->unacked_frames) |
1a09bcb9 | 1342 | __clear_retrans_timer(chan); |
1c2acffb | 1343 | } |
1da177e4 | 1344 | |
67c9e840 | 1345 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1346 | { |
ccbb84af | 1347 | struct sk_buff *skb; |
88843ab0 AE |
1348 | u32 control; |
1349 | u16 fcs; | |
6840ed07 | 1350 | |
58d35f87 | 1351 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1352 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1353 | control |= __set_txseq(chan, chan->next_tx_seq); |
88843ab0 | 1354 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1355 | |
47d1ec61 | 1356 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1357 | fcs = crc16(0, (u8 *)skb->data, |
1358 | skb->len - L2CAP_FCS_SIZE); | |
1359 | put_unaligned_le16(fcs, | |
1360 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1361 | } |
1362 | ||
4343478f | 1363 | l2cap_do_send(chan, skb); |
6840ed07 | 1364 | |
836be934 | 1365 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1366 | } |
6840ed07 GP |
1367 | } |
1368 | ||
fb45de7d | 1369 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1370 | { |
8f17154f | 1371 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1372 | u16 fcs; |
1373 | u32 control; | |
8f17154f | 1374 | |
58d35f87 | 1375 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1376 | if (!skb) |
1377 | return; | |
8f17154f | 1378 | |
d1726b6d | 1379 | while (bt_cb(skb)->tx_seq != tx_seq) { |
58d35f87 | 1380 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1381 | return; |
8f17154f | 1382 | |
d1726b6d SJ |
1383 | skb = skb_queue_next(&chan->tx_q, skb); |
1384 | } | |
8f17154f | 1385 | |
2c03a7a4 GP |
1386 | if (chan->remote_max_tx && |
1387 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1388 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1389 | return; |
1390 | } | |
1391 | ||
1392 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1393 | bt_cb(skb)->retries++; | |
88843ab0 AE |
1394 | |
1395 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1396 | control &= __get_sar_mask(chan); |
3cb123d1 | 1397 | |
e2ab4353 | 1398 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1399 | control |= __set_ctrl_final(chan); |
95ffa978 | 1400 | |
0b209fae | 1401 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1402 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1403 | |
88843ab0 | 1404 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1405 | |
47d1ec61 | 1406 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1407 | fcs = crc16(0, (u8 *)tx_skb->data, |
1408 | tx_skb->len - L2CAP_FCS_SIZE); | |
1409 | put_unaligned_le16(fcs, | |
1410 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1411 | } |
1412 | ||
4343478f | 1413 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1414 | } |
1415 | ||
67c9e840 | 1416 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1417 | { |
1418 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1419 | u16 fcs; |
1420 | u32 control; | |
9a9c6a34 | 1421 | int nsent = 0; |
1c2acffb | 1422 | |
89bc500e | 1423 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1424 | return -ENOTCONN; |
e90bac06 | 1425 | |
58d35f87 | 1426 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1427 | |
2c03a7a4 GP |
1428 | if (chan->remote_max_tx && |
1429 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1430 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1431 | break; |
1432 | } | |
1433 | ||
e420aba3 AE |
1434 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1435 | ||
e90bac06 GP |
1436 | bt_cb(skb)->retries++; |
1437 | ||
88843ab0 | 1438 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1439 | control &= __get_sar_mask(chan); |
95ffa978 | 1440 | |
e2ab4353 | 1441 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1442 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1443 | |
0b209fae | 1444 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1445 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb | 1446 | |
88843ab0 | 1447 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1448 | |
47d1ec61 | 1449 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1450 | fcs = crc16(0, (u8 *)skb->data, |
1451 | tx_skb->len - L2CAP_FCS_SIZE); | |
1452 | put_unaligned_le16(fcs, skb->data + | |
1453 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1454 | } |
1455 | ||
4343478f | 1456 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1457 | |
1a09bcb9 | 1458 | __set_retrans_timer(chan); |
1c2acffb | 1459 | |
42e5c802 | 1460 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
836be934 AE |
1461 | |
1462 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1463 | |
23e9fde2 | 1464 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1465 | chan->unacked_frames++; |
23e9fde2 | 1466 | |
6a026610 | 1467 | chan->frames_sent++; |
1c2acffb | 1468 | |
58d35f87 GP |
1469 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1470 | chan->tx_send_head = NULL; | |
1c2acffb | 1471 | else |
58d35f87 | 1472 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1473 | |
1474 | nsent++; | |
1c2acffb GP |
1475 | } |
1476 | ||
9e917af1 GP |
1477 | return nsent; |
1478 | } | |
1479 | ||
525cd185 | 1480 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1481 | { |
dfc909be GP |
1482 | int ret; |
1483 | ||
58d35f87 GP |
1484 | if (!skb_queue_empty(&chan->tx_q)) |
1485 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1486 | |
42e5c802 | 1487 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1488 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1489 | return ret; |
1490 | } | |
1491 | ||
525cd185 | 1492 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1493 | { |
88843ab0 | 1494 | u32 control = 0; |
9e917af1 | 1495 | |
0b209fae | 1496 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1497 | |
e2ab4353 | 1498 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1499 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1500 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1501 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1502 | return; |
9e917af1 | 1503 | } |
dfc909be | 1504 | |
525cd185 | 1505 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1506 | return; |
1507 | ||
ab784b73 | 1508 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1509 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1510 | } |
1511 | ||
525cd185 | 1512 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1513 | { |
1514 | struct srej_list *tail; | |
88843ab0 | 1515 | u32 control; |
99b0d4b7 | 1516 | |
ab784b73 | 1517 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1518 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1519 | |
39d5a3ee | 1520 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1521 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1522 | |
525cd185 | 1523 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1524 | } |
1525 | ||
1c2acffb GP |
1526 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1527 | { | |
8c1d787b | 1528 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1529 | struct sk_buff **frag; |
1530 | int err, sent = 0; | |
1da177e4 | 1531 | |
59203a21 | 1532 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1533 | return -EFAULT; |
1da177e4 LT |
1534 | |
1535 | sent += count; | |
1536 | len -= count; | |
1537 | ||
1538 | /* Continuation fragments (no L2CAP header) */ | |
1539 | frag = &skb_shinfo(skb)->frag_list; | |
1540 | while (len) { | |
1541 | count = min_t(unsigned int, conn->mtu, len); | |
1542 | ||
1543 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1544 | if (!*frag) | |
0175d629 | 1545 | return err; |
1c2acffb GP |
1546 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1547 | return -EFAULT; | |
1da177e4 | 1548 | |
5e59b791 LAD |
1549 | (*frag)->priority = skb->priority; |
1550 | ||
1da177e4 LT |
1551 | sent += count; |
1552 | len -= count; | |
1553 | ||
1554 | frag = &(*frag)->next; | |
1555 | } | |
1da177e4 LT |
1556 | |
1557 | return sent; | |
1c2acffb | 1558 | } |
1da177e4 | 1559 | |
5e59b791 LAD |
1560 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1561 | struct msghdr *msg, size_t len, | |
1562 | u32 priority) | |
1c2acffb | 1563 | { |
fe4128e0 | 1564 | struct sock *sk = chan->sk; |
8c1d787b | 1565 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1566 | struct sk_buff *skb; |
03a51213 | 1567 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1568 | struct l2cap_hdr *lh; |
1569 | ||
5e59b791 | 1570 | BT_DBG("sk %p len %d priority %u", sk, (int)len, priority); |
1c2acffb GP |
1571 | |
1572 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1573 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1574 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1575 | if (!skb) | |
0175d629 | 1576 | return ERR_PTR(err); |
1c2acffb | 1577 | |
5e59b791 LAD |
1578 | skb->priority = priority; |
1579 | ||
1c2acffb GP |
1580 | /* Create L2CAP header */ |
1581 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1582 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1583 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1584 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1585 | |
1586 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1587 | if (unlikely(err < 0)) { | |
1588 | kfree_skb(skb); | |
1589 | return ERR_PTR(err); | |
1590 | } | |
1591 | return skb; | |
1592 | } | |
1593 | ||
5e59b791 LAD |
1594 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1595 | struct msghdr *msg, size_t len, | |
1596 | u32 priority) | |
1c2acffb | 1597 | { |
fe4128e0 | 1598 | struct sock *sk = chan->sk; |
8c1d787b | 1599 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1600 | struct sk_buff *skb; |
1601 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1602 | struct l2cap_hdr *lh; | |
1603 | ||
1604 | BT_DBG("sk %p len %d", sk, (int)len); | |
1605 | ||
1606 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1607 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1608 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1609 | if (!skb) | |
0175d629 | 1610 | return ERR_PTR(err); |
1c2acffb | 1611 | |
5e59b791 LAD |
1612 | skb->priority = priority; |
1613 | ||
1c2acffb GP |
1614 | /* Create L2CAP header */ |
1615 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1616 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1617 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1618 | ||
1619 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1620 | if (unlikely(err < 0)) { | |
1621 | kfree_skb(skb); | |
1622 | return ERR_PTR(err); | |
1623 | } | |
1624 | return skb; | |
1625 | } | |
1626 | ||
ab0ff76d LAD |
1627 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1628 | struct msghdr *msg, size_t len, | |
88843ab0 | 1629 | u32 control, u16 sdulen) |
1c2acffb | 1630 | { |
47d1ec61 | 1631 | struct sock *sk = chan->sk; |
8c1d787b | 1632 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1633 | struct sk_buff *skb; |
e4ca6d98 | 1634 | int err, count, hlen; |
1c2acffb GP |
1635 | struct l2cap_hdr *lh; |
1636 | ||
1637 | BT_DBG("sk %p len %d", sk, (int)len); | |
1638 | ||
0ee0d208 GP |
1639 | if (!conn) |
1640 | return ERR_PTR(-ENOTCONN); | |
1641 | ||
e4ca6d98 AE |
1642 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1643 | hlen = L2CAP_EXT_HDR_SIZE; | |
1644 | else | |
1645 | hlen = L2CAP_ENH_HDR_SIZE; | |
1646 | ||
c74e560c | 1647 | if (sdulen) |
03a51213 | 1648 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1649 | |
47d1ec61 | 1650 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1651 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1652 | |
1c2acffb GP |
1653 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1654 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1655 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1656 | if (!skb) | |
0175d629 | 1657 | return ERR_PTR(err); |
1c2acffb GP |
1658 | |
1659 | /* Create L2CAP header */ | |
1660 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1661 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1662 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 AE |
1663 | |
1664 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1665 | ||
c74e560c | 1666 | if (sdulen) |
03a51213 | 1667 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb GP |
1668 | |
1669 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1670 | if (unlikely(err < 0)) { | |
1671 | kfree_skb(skb); | |
1672 | return ERR_PTR(err); | |
1673 | } | |
e90bac06 | 1674 | |
47d1ec61 | 1675 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1676 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1677 | |
e90bac06 | 1678 | bt_cb(skb)->retries = 0; |
1c2acffb | 1679 | return skb; |
1da177e4 LT |
1680 | } |
1681 | ||
67c9e840 | 1682 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1683 | { |
c74e560c GP |
1684 | struct sk_buff *skb; |
1685 | struct sk_buff_head sar_queue; | |
88843ab0 | 1686 | u32 control; |
c74e560c GP |
1687 | size_t size = 0; |
1688 | ||
ff12fd64 | 1689 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1690 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1691 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1692 | if (IS_ERR(skb)) |
1693 | return PTR_ERR(skb); | |
1694 | ||
1695 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1696 | len -= chan->remote_mps; |
1697 | size += chan->remote_mps; | |
c74e560c GP |
1698 | |
1699 | while (len > 0) { | |
1700 | size_t buflen; | |
1701 | ||
2c03a7a4 | 1702 | if (len > chan->remote_mps) { |
7e0ef6ee | 1703 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1704 | buflen = chan->remote_mps; |
c74e560c | 1705 | } else { |
7e0ef6ee | 1706 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1707 | buflen = len; |
1708 | } | |
1709 | ||
47d1ec61 | 1710 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1711 | if (IS_ERR(skb)) { |
1712 | skb_queue_purge(&sar_queue); | |
1713 | return PTR_ERR(skb); | |
1714 | } | |
1715 | ||
1716 | __skb_queue_tail(&sar_queue, skb); | |
1717 | len -= buflen; | |
1718 | size += buflen; | |
c74e560c | 1719 | } |
58d35f87 GP |
1720 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1721 | if (chan->tx_send_head == NULL) | |
1722 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1723 | |
1724 | return size; | |
1725 | } | |
1726 | ||
5e59b791 LAD |
1727 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
1728 | u32 priority) | |
9a91a04a | 1729 | { |
9a91a04a | 1730 | struct sk_buff *skb; |
88843ab0 | 1731 | u32 control; |
9a91a04a GP |
1732 | int err; |
1733 | ||
1734 | /* Connectionless channel */ | |
715ec005 | 1735 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 1736 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
1737 | if (IS_ERR(skb)) |
1738 | return PTR_ERR(skb); | |
1739 | ||
1740 | l2cap_do_send(chan, skb); | |
1741 | return len; | |
1742 | } | |
1743 | ||
1744 | switch (chan->mode) { | |
1745 | case L2CAP_MODE_BASIC: | |
1746 | /* Check outgoing MTU */ | |
1747 | if (len > chan->omtu) | |
1748 | return -EMSGSIZE; | |
1749 | ||
1750 | /* Create a basic PDU */ | |
5e59b791 | 1751 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
1752 | if (IS_ERR(skb)) |
1753 | return PTR_ERR(skb); | |
1754 | ||
1755 | l2cap_do_send(chan, skb); | |
1756 | err = len; | |
1757 | break; | |
1758 | ||
1759 | case L2CAP_MODE_ERTM: | |
1760 | case L2CAP_MODE_STREAMING: | |
1761 | /* Entire SDU fits into one PDU */ | |
1762 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1763 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1764 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1765 | 0); | |
1766 | if (IS_ERR(skb)) | |
1767 | return PTR_ERR(skb); | |
1768 | ||
1769 | __skb_queue_tail(&chan->tx_q, skb); | |
1770 | ||
1771 | if (chan->tx_send_head == NULL) | |
1772 | chan->tx_send_head = skb; | |
1773 | ||
1774 | } else { | |
1775 | /* Segment SDU into multiples PDUs */ | |
1776 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1777 | if (err < 0) | |
1778 | return err; | |
1779 | } | |
1780 | ||
1781 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1782 | l2cap_streaming_send(chan); | |
1783 | err = len; | |
1784 | break; | |
1785 | } | |
1786 | ||
e2ab4353 GP |
1787 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1788 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1789 | err = len; |
1790 | break; | |
1791 | } | |
1792 | ||
1793 | err = l2cap_ertm_send(chan); | |
1794 | if (err >= 0) | |
1795 | err = len; | |
1796 | ||
1797 | break; | |
1798 | ||
1799 | default: | |
1800 | BT_DBG("bad state %1.1x", chan->mode); | |
1801 | err = -EBADFD; | |
1802 | } | |
1803 | ||
1804 | return err; | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | /* Copy frame to all raw sockets on that connection */ |
1808 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1809 | { | |
1da177e4 | 1810 | struct sk_buff *nskb; |
48454079 | 1811 | struct l2cap_chan *chan; |
1da177e4 LT |
1812 | |
1813 | BT_DBG("conn %p", conn); | |
1814 | ||
3d57dc68 GP |
1815 | rcu_read_lock(); |
1816 | ||
1817 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { | |
48454079 | 1818 | struct sock *sk = chan->sk; |
715ec005 | 1819 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1820 | continue; |
1821 | ||
1822 | /* Don't send frame to the socket it came from */ | |
1823 | if (skb->sk == sk) | |
1824 | continue; | |
af05b30b GP |
1825 | nskb = skb_clone(skb, GFP_ATOMIC); |
1826 | if (!nskb) | |
1da177e4 LT |
1827 | continue; |
1828 | ||
23070494 | 1829 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1830 | kfree_skb(nskb); |
1831 | } | |
3d57dc68 GP |
1832 | |
1833 | rcu_read_unlock(); | |
1da177e4 LT |
1834 | } |
1835 | ||
1836 | /* ---- L2CAP signalling commands ---- */ | |
1837 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1838 | u8 code, u8 ident, u16 dlen, void *data) | |
1839 | { | |
1840 | struct sk_buff *skb, **frag; | |
1841 | struct l2cap_cmd_hdr *cmd; | |
1842 | struct l2cap_hdr *lh; | |
1843 | int len, count; | |
1844 | ||
af05b30b GP |
1845 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1846 | conn, code, ident, dlen); | |
1da177e4 LT |
1847 | |
1848 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1849 | count = min_t(unsigned int, conn->mtu, len); | |
1850 | ||
1851 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1852 | if (!skb) | |
1853 | return NULL; | |
1854 | ||
1855 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1856 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1857 | |
1858 | if (conn->hcon->type == LE_LINK) | |
1859 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1860 | else | |
1861 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1862 | |
1863 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1864 | cmd->code = code; | |
1865 | cmd->ident = ident; | |
aca3192c | 1866 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1867 | |
1868 | if (dlen) { | |
1869 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1870 | memcpy(skb_put(skb, count), data, count); | |
1871 | data += count; | |
1872 | } | |
1873 | ||
1874 | len -= skb->len; | |
1875 | ||
1876 | /* Continuation fragments (no L2CAP header) */ | |
1877 | frag = &skb_shinfo(skb)->frag_list; | |
1878 | while (len) { | |
1879 | count = min_t(unsigned int, conn->mtu, len); | |
1880 | ||
1881 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1882 | if (!*frag) | |
1883 | goto fail; | |
1884 | ||
1885 | memcpy(skb_put(*frag, count), data, count); | |
1886 | ||
1887 | len -= count; | |
1888 | data += count; | |
1889 | ||
1890 | frag = &(*frag)->next; | |
1891 | } | |
1892 | ||
1893 | return skb; | |
1894 | ||
1895 | fail: | |
1896 | kfree_skb(skb); | |
1897 | return NULL; | |
1898 | } | |
1899 | ||
1900 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1901 | { | |
1902 | struct l2cap_conf_opt *opt = *ptr; | |
1903 | int len; | |
1904 | ||
1905 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1906 | *ptr += len; | |
1907 | ||
1908 | *type = opt->type; | |
1909 | *olen = opt->len; | |
1910 | ||
1911 | switch (opt->len) { | |
1912 | case 1: | |
1913 | *val = *((u8 *) opt->val); | |
1914 | break; | |
1915 | ||
1916 | case 2: | |
bfaaeb3e | 1917 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1918 | break; |
1919 | ||
1920 | case 4: | |
bfaaeb3e | 1921 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1922 | break; |
1923 | ||
1924 | default: | |
1925 | *val = (unsigned long) opt->val; | |
1926 | break; | |
1927 | } | |
1928 | ||
1929 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1930 | return len; | |
1931 | } | |
1932 | ||
1da177e4 LT |
1933 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1934 | { | |
1935 | struct l2cap_conf_opt *opt = *ptr; | |
1936 | ||
1937 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1938 | ||
1939 | opt->type = type; | |
1940 | opt->len = len; | |
1941 | ||
1942 | switch (len) { | |
1943 | case 1: | |
1944 | *((u8 *) opt->val) = val; | |
1945 | break; | |
1946 | ||
1947 | case 2: | |
4f8b691c | 1948 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1949 | break; |
1950 | ||
1951 | case 4: | |
4f8b691c | 1952 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1953 | break; |
1954 | ||
1955 | default: | |
1956 | memcpy(opt->val, (void *) val, len); | |
1957 | break; | |
1958 | } | |
1959 | ||
1960 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1961 | } | |
1962 | ||
f89cef09 AE |
1963 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
1964 | { | |
1965 | struct l2cap_conf_efs efs; | |
1966 | ||
1ec918ce | 1967 | switch (chan->mode) { |
f89cef09 AE |
1968 | case L2CAP_MODE_ERTM: |
1969 | efs.id = chan->local_id; | |
1970 | efs.stype = chan->local_stype; | |
1971 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1972 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1973 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
1974 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
1975 | break; | |
1976 | ||
1977 | case L2CAP_MODE_STREAMING: | |
1978 | efs.id = 1; | |
1979 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
1980 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1981 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1982 | efs.acc_lat = 0; | |
1983 | efs.flush_to = 0; | |
1984 | break; | |
1985 | ||
1986 | default: | |
1987 | return; | |
1988 | } | |
1989 | ||
1990 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
1991 | (unsigned long) &efs); | |
1992 | } | |
1993 | ||
721c4181 | 1994 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 1995 | { |
721c4181 GP |
1996 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1997 | ack_timer.work); | |
c1b4f43b | 1998 | |
721c4181 | 1999 | lock_sock(chan->sk); |
525cd185 | 2000 | l2cap_send_ack(chan); |
721c4181 | 2001 | release_sock(chan->sk); |
c1b4f43b GP |
2002 | } |
2003 | ||
525cd185 | 2004 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2005 | { |
42e5c802 | 2006 | chan->expected_ack_seq = 0; |
6a026610 | 2007 | chan->unacked_frames = 0; |
42e5c802 | 2008 | chan->buffer_seq = 0; |
6a026610 GP |
2009 | chan->num_acked = 0; |
2010 | chan->frames_sent = 0; | |
0565c1c2 | 2011 | |
721c4181 GP |
2012 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2013 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2014 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2015 | |
f1c6775b | 2016 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2017 | |
39d5a3ee | 2018 | INIT_LIST_HEAD(&chan->srej_l); |
0565c1c2 GP |
2019 | } |
2020 | ||
f2fcfcd6 GP |
2021 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2022 | { | |
2023 | switch (mode) { | |
2024 | case L2CAP_MODE_STREAMING: | |
2025 | case L2CAP_MODE_ERTM: | |
2026 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2027 | return mode; | |
2028 | /* fall through */ | |
2029 | default: | |
2030 | return L2CAP_MODE_BASIC; | |
2031 | } | |
2032 | } | |
2033 | ||
6327eb98 AE |
2034 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2035 | { | |
2036 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2037 | } | |
2038 | ||
f89cef09 AE |
2039 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2040 | { | |
2041 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2042 | } | |
2043 | ||
6327eb98 AE |
2044 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2045 | { | |
2046 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2047 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2048 | /* use extended control field */ |
2049 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2050 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2051 | } else { | |
6327eb98 AE |
2052 | chan->tx_win = min_t(u16, chan->tx_win, |
2053 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2054 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2055 | } | |
6327eb98 AE |
2056 | } |
2057 | ||
710f9b0a | 2058 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2059 | { |
1da177e4 | 2060 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2061 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2062 | void *ptr = req->data; |
c8f79162 | 2063 | u16 size; |
1da177e4 | 2064 | |
49208c9c | 2065 | BT_DBG("chan %p", chan); |
1da177e4 | 2066 | |
73ffa904 | 2067 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2068 | goto done; |
2069 | ||
0c1bc5c6 | 2070 | switch (chan->mode) { |
f2fcfcd6 GP |
2071 | case L2CAP_MODE_STREAMING: |
2072 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2073 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2074 | break; |
85eb53c6 | 2075 | |
f89cef09 AE |
2076 | if (__l2cap_efs_supported(chan)) |
2077 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2078 | ||
2ba13ed6 | 2079 | /* fall through */ |
f2fcfcd6 | 2080 | default: |
8c1d787b | 2081 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2082 | break; |
2083 | } | |
2084 | ||
2085 | done: | |
0c1bc5c6 GP |
2086 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2087 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2088 | |
0c1bc5c6 | 2089 | switch (chan->mode) { |
65c7c491 | 2090 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2091 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2092 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2093 | break; |
2094 | ||
62547752 GP |
2095 | rfc.mode = L2CAP_MODE_BASIC; |
2096 | rfc.txwin_size = 0; | |
2097 | rfc.max_transmit = 0; | |
2098 | rfc.retrans_timeout = 0; | |
2099 | rfc.monitor_timeout = 0; | |
2100 | rfc.max_pdu_size = 0; | |
2101 | ||
63406504 GP |
2102 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2103 | (unsigned long) &rfc); | |
65c7c491 MH |
2104 | break; |
2105 | ||
2106 | case L2CAP_MODE_ERTM: | |
2107 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2108 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2109 | rfc.retrans_timeout = 0; |
2110 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2111 | |
2112 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2113 | L2CAP_EXT_HDR_SIZE - | |
2114 | L2CAP_SDULEN_SIZE - | |
2115 | L2CAP_FCS_SIZE); | |
2116 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2117 | |
6327eb98 AE |
2118 | l2cap_txwin_setup(chan); |
2119 | ||
2120 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2121 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2122 | |
63406504 GP |
2123 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2124 | (unsigned long) &rfc); | |
2125 | ||
f89cef09 AE |
2126 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2127 | l2cap_add_opt_efs(&ptr, chan); | |
2128 | ||
8c1d787b | 2129 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2130 | break; |
2131 | ||
47d1ec61 | 2132 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2133 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2134 | chan->fcs = L2CAP_FCS_NONE; |
2135 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2136 | } |
6327eb98 AE |
2137 | |
2138 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2139 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2140 | chan->tx_win); | |
f2fcfcd6 GP |
2141 | break; |
2142 | ||
2143 | case L2CAP_MODE_STREAMING: | |
2144 | rfc.mode = L2CAP_MODE_STREAMING; | |
2145 | rfc.txwin_size = 0; | |
2146 | rfc.max_transmit = 0; | |
2147 | rfc.retrans_timeout = 0; | |
2148 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2149 | |
2150 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2151 | L2CAP_EXT_HDR_SIZE - | |
2152 | L2CAP_SDULEN_SIZE - | |
2153 | L2CAP_FCS_SIZE); | |
2154 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2155 | |
63406504 GP |
2156 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2157 | (unsigned long) &rfc); | |
2158 | ||
f89cef09 AE |
2159 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2160 | l2cap_add_opt_efs(&ptr, chan); | |
2161 | ||
8c1d787b | 2162 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2163 | break; |
2164 | ||
47d1ec61 | 2165 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2166 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2167 | chan->fcs = L2CAP_FCS_NONE; |
2168 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2169 | } |
65c7c491 MH |
2170 | break; |
2171 | } | |
1da177e4 | 2172 | |
fe4128e0 | 2173 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2174 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2175 | |
2176 | return ptr - data; | |
2177 | } | |
2178 | ||
73ffa904 | 2179 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2180 | { |
5dee9e7c MH |
2181 | struct l2cap_conf_rsp *rsp = data; |
2182 | void *ptr = rsp->data; | |
73ffa904 GP |
2183 | void *req = chan->conf_req; |
2184 | int len = chan->conf_len; | |
5dee9e7c MH |
2185 | int type, hint, olen; |
2186 | unsigned long val; | |
6464f35f | 2187 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2188 | struct l2cap_conf_efs efs; |
2189 | u8 remote_efs = 0; | |
861d6882 | 2190 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2191 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2192 | u16 size; |
1da177e4 | 2193 | |
73ffa904 | 2194 | BT_DBG("chan %p", chan); |
820ae1b8 | 2195 | |
5dee9e7c MH |
2196 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2197 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2198 | |
589d2746 | 2199 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2200 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2201 | |
2202 | switch (type) { | |
2203 | case L2CAP_CONF_MTU: | |
861d6882 | 2204 | mtu = val; |
5dee9e7c MH |
2205 | break; |
2206 | ||
2207 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2208 | chan->flush_to = val; |
5dee9e7c MH |
2209 | break; |
2210 | ||
2211 | case L2CAP_CONF_QOS: | |
2212 | break; | |
2213 | ||
6464f35f MH |
2214 | case L2CAP_CONF_RFC: |
2215 | if (olen == sizeof(rfc)) | |
2216 | memcpy(&rfc, (void *) val, olen); | |
2217 | break; | |
2218 | ||
fcc203c3 GP |
2219 | case L2CAP_CONF_FCS: |
2220 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2221 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2222 | break; |
fcc203c3 | 2223 | |
42dceae2 AE |
2224 | case L2CAP_CONF_EFS: |
2225 | remote_efs = 1; | |
2226 | if (olen == sizeof(efs)) | |
2227 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2228 | break; |
2229 | ||
6327eb98 AE |
2230 | case L2CAP_CONF_EWS: |
2231 | if (!enable_hs) | |
2232 | return -ECONNREFUSED; | |
fcc203c3 | 2233 | |
6327eb98 AE |
2234 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2235 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2236 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2237 | chan->remote_tx_win = val; |
fcc203c3 GP |
2238 | break; |
2239 | ||
5dee9e7c MH |
2240 | default: |
2241 | if (hint) | |
2242 | break; | |
2243 | ||
2244 | result = L2CAP_CONF_UNKNOWN; | |
2245 | *((u8 *) ptr++) = type; | |
2246 | break; | |
2247 | } | |
2248 | } | |
2249 | ||
73ffa904 | 2250 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2251 | goto done; |
2252 | ||
0c1bc5c6 | 2253 | switch (chan->mode) { |
f2fcfcd6 GP |
2254 | case L2CAP_MODE_STREAMING: |
2255 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2256 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2257 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2258 | chan->conn->feat_mask); |
85eb53c6 GP |
2259 | break; |
2260 | } | |
2261 | ||
42dceae2 AE |
2262 | if (remote_efs) { |
2263 | if (__l2cap_efs_supported(chan)) | |
2264 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2265 | else | |
2266 | return -ECONNREFUSED; | |
2267 | } | |
2268 | ||
0c1bc5c6 | 2269 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2270 | return -ECONNREFUSED; |
742e519b | 2271 | |
f2fcfcd6 | 2272 | break; |
f2fcfcd6 GP |
2273 | } |
2274 | ||
2275 | done: | |
0c1bc5c6 | 2276 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2277 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2278 | rfc.mode = chan->mode; |
f2fcfcd6 | 2279 | |
73ffa904 | 2280 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2281 | return -ECONNREFUSED; |
2282 | ||
2283 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2284 | sizeof(rfc), (unsigned long) &rfc); | |
2285 | } | |
2286 | ||
5dee9e7c MH |
2287 | if (result == L2CAP_CONF_SUCCESS) { |
2288 | /* Configure output options and let the other side know | |
2289 | * which ones we don't like. */ | |
2290 | ||
f2fcfcd6 GP |
2291 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2292 | result = L2CAP_CONF_UNACCEPT; | |
2293 | else { | |
0c1bc5c6 | 2294 | chan->omtu = mtu; |
c1360a1c | 2295 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2296 | } |
0c1bc5c6 | 2297 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2298 | |
42dceae2 AE |
2299 | if (remote_efs) { |
2300 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2301 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2302 | efs.stype != chan->local_stype) { | |
2303 | ||
2304 | result = L2CAP_CONF_UNACCEPT; | |
2305 | ||
2306 | if (chan->num_conf_req >= 1) | |
2307 | return -ECONNREFUSED; | |
2308 | ||
2309 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2310 | sizeof(efs), |
42dceae2 | 2311 | (unsigned long) &efs); |
0e8b207e | 2312 | } else { |
3e6b3b95 | 2313 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2314 | result = L2CAP_CONF_PENDING; |
2315 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2316 | } |
2317 | } | |
2318 | ||
f2fcfcd6 GP |
2319 | switch (rfc.mode) { |
2320 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2321 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2322 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2323 | break; |
2324 | ||
2325 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2326 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2327 | chan->remote_tx_win = rfc.txwin_size; | |
2328 | else | |
2329 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2330 | |
2c03a7a4 | 2331 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2332 | |
c8f79162 AE |
2333 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2334 | chan->conn->mtu - | |
2335 | L2CAP_EXT_HDR_SIZE - | |
2336 | L2CAP_SDULEN_SIZE - | |
2337 | L2CAP_FCS_SIZE); | |
2338 | rfc.max_pdu_size = cpu_to_le16(size); | |
2339 | chan->remote_mps = size; | |
f2fcfcd6 | 2340 | |
10467e9e GP |
2341 | rfc.retrans_timeout = |
2342 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2343 | rfc.monitor_timeout = | |
2344 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2345 | |
c1360a1c | 2346 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2347 | |
2348 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2349 | sizeof(rfc), (unsigned long) &rfc); | |
2350 | ||
42dceae2 AE |
2351 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2352 | chan->remote_id = efs.id; | |
2353 | chan->remote_stype = efs.stype; | |
2354 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2355 | chan->remote_flush_to = | |
2356 | le32_to_cpu(efs.flush_to); | |
2357 | chan->remote_acc_lat = | |
2358 | le32_to_cpu(efs.acc_lat); | |
2359 | chan->remote_sdu_itime = | |
2360 | le32_to_cpu(efs.sdu_itime); | |
2361 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2362 | sizeof(efs), (unsigned long) &efs); | |
2363 | } | |
f2fcfcd6 GP |
2364 | break; |
2365 | ||
2366 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2367 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2368 | chan->conn->mtu - | |
2369 | L2CAP_EXT_HDR_SIZE - | |
2370 | L2CAP_SDULEN_SIZE - | |
2371 | L2CAP_FCS_SIZE); | |
2372 | rfc.max_pdu_size = cpu_to_le16(size); | |
2373 | chan->remote_mps = size; | |
f2fcfcd6 | 2374 | |
c1360a1c | 2375 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2376 | |
2377 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2378 | sizeof(rfc), (unsigned long) &rfc); | |
2379 | ||
f2fcfcd6 GP |
2380 | break; |
2381 | ||
2382 | default: | |
5dee9e7c | 2383 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2384 | |
6464f35f | 2385 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2386 | rfc.mode = chan->mode; |
f2fcfcd6 | 2387 | } |
6464f35f | 2388 | |
f2fcfcd6 | 2389 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2390 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2391 | } |
fe4128e0 | 2392 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2393 | rsp->result = cpu_to_le16(result); |
2394 | rsp->flags = cpu_to_le16(0x0000); | |
2395 | ||
2396 | return ptr - data; | |
1da177e4 LT |
2397 | } |
2398 | ||
b4450035 | 2399 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2400 | { |
f2fcfcd6 GP |
2401 | struct l2cap_conf_req *req = data; |
2402 | void *ptr = req->data; | |
2403 | int type, olen; | |
2404 | unsigned long val; | |
36e999a8 | 2405 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 2406 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2407 | |
fe4128e0 | 2408 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2409 | |
2410 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2411 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2412 | ||
2413 | switch (type) { | |
2414 | case L2CAP_CONF_MTU: | |
2415 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2416 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2417 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2418 | } else |
0c1bc5c6 GP |
2419 | chan->imtu = val; |
2420 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2421 | break; |
2422 | ||
2423 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2424 | chan->flush_to = val; |
f2fcfcd6 | 2425 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2426 | 2, chan->flush_to); |
f2fcfcd6 GP |
2427 | break; |
2428 | ||
2429 | case L2CAP_CONF_RFC: | |
2430 | if (olen == sizeof(rfc)) | |
2431 | memcpy(&rfc, (void *)val, olen); | |
2432 | ||
c1360a1c | 2433 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2434 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2435 | return -ECONNREFUSED; |
2436 | ||
47d1ec61 | 2437 | chan->fcs = 0; |
f2fcfcd6 GP |
2438 | |
2439 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2440 | sizeof(rfc), (unsigned long) &rfc); | |
2441 | break; | |
6327eb98 AE |
2442 | |
2443 | case L2CAP_CONF_EWS: | |
2444 | chan->tx_win = min_t(u16, val, | |
2445 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2446 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2447 | chan->tx_win); | |
6327eb98 | 2448 | break; |
66af7aaf AE |
2449 | |
2450 | case L2CAP_CONF_EFS: | |
2451 | if (olen == sizeof(efs)) | |
2452 | memcpy(&efs, (void *)val, olen); | |
2453 | ||
2454 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2455 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2456 | efs.stype != chan->local_stype) | |
2457 | return -ECONNREFUSED; | |
2458 | ||
2459 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2460 | sizeof(efs), (unsigned long) &efs); | |
2461 | break; | |
f2fcfcd6 GP |
2462 | } |
2463 | } | |
2464 | ||
0c1bc5c6 | 2465 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2466 | return -ECONNREFUSED; |
2467 | ||
0c1bc5c6 | 2468 | chan->mode = rfc.mode; |
6c2ea7a8 | 2469 | |
0e8b207e | 2470 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2471 | switch (rfc.mode) { |
2472 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2473 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2474 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2475 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2476 | |
2477 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2478 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2479 | chan->local_sdu_itime = | |
2480 | le32_to_cpu(efs.sdu_itime); | |
2481 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2482 | chan->local_flush_to = | |
2483 | le32_to_cpu(efs.flush_to); | |
2484 | } | |
f2fcfcd6 | 2485 | break; |
66af7aaf | 2486 | |
f2fcfcd6 | 2487 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2488 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2489 | } |
2490 | } | |
2491 | ||
fe4128e0 | 2492 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2493 | req->flags = cpu_to_le16(0x0000); |
2494 | ||
2495 | return ptr - data; | |
2496 | } | |
2497 | ||
fe4128e0 | 2498 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2499 | { |
2500 | struct l2cap_conf_rsp *rsp = data; | |
2501 | void *ptr = rsp->data; | |
1da177e4 | 2502 | |
fe4128e0 | 2503 | BT_DBG("chan %p", chan); |
1da177e4 | 2504 | |
fe4128e0 | 2505 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2506 | rsp->result = cpu_to_le16(result); |
aca3192c | 2507 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2508 | |
2509 | return ptr - data; | |
2510 | } | |
2511 | ||
8c1d787b | 2512 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2513 | { |
2514 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2515 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2516 | u8 buf[128]; |
2517 | ||
fe4128e0 GP |
2518 | rsp.scid = cpu_to_le16(chan->dcid); |
2519 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2520 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2521 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2522 | l2cap_send_cmd(conn, chan->ident, | |
2523 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2524 | ||
c1360a1c | 2525 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2526 | return; |
2527 | ||
710f9b0a GP |
2528 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2529 | l2cap_build_conf_req(chan, buf), buf); | |
2530 | chan->num_conf_req++; | |
2531 | } | |
2532 | ||
47d1ec61 | 2533 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2534 | { |
7b1c0049 GP |
2535 | int type, olen; |
2536 | unsigned long val; | |
2537 | struct l2cap_conf_rfc rfc; | |
2538 | ||
47d1ec61 | 2539 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2540 | |
0c1bc5c6 | 2541 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2542 | return; |
2543 | ||
2544 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2545 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2546 | ||
2547 | switch (type) { | |
2548 | case L2CAP_CONF_RFC: | |
2549 | if (olen == sizeof(rfc)) | |
2550 | memcpy(&rfc, (void *)val, olen); | |
2551 | goto done; | |
2552 | } | |
2553 | } | |
2554 | ||
36e999a8 MM |
2555 | /* Use sane default values in case a misbehaving remote device |
2556 | * did not send an RFC option. | |
2557 | */ | |
2558 | rfc.mode = chan->mode; | |
2559 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
2560 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
2561 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
2562 | ||
2563 | BT_ERR("Expected RFC option was not found, using defaults"); | |
2564 | ||
7b1c0049 GP |
2565 | done: |
2566 | switch (rfc.mode) { | |
2567 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2568 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2569 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2570 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2571 | break; |
2572 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2573 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2574 | } |
2575 | } | |
2576 | ||
4e8402a3 MH |
2577 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2578 | { | |
e2fd318e | 2579 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2580 | |
e2fd318e | 2581 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2582 | return 0; |
2583 | ||
2584 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2585 | cmd->ident == conn->info_ident) { | |
f878fcad | 2586 | cancel_delayed_work_sync(&conn->info_work); |
984947dc MH |
2587 | |
2588 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2589 | conn->info_ident = 0; |
984947dc | 2590 | |
4e8402a3 MH |
2591 | l2cap_conn_start(conn); |
2592 | } | |
2593 | ||
2594 | return 0; | |
2595 | } | |
2596 | ||
1da177e4 LT |
2597 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2598 | { | |
1da177e4 LT |
2599 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2600 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2601 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2602 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2603 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2604 | |
2605 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2606 | __le16 psm = req->psm; |
1da177e4 LT |
2607 | |
2608 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2609 | ||
2610 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2611 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2612 | if (!pchan) { | |
1da177e4 LT |
2613 | result = L2CAP_CR_BAD_PSM; |
2614 | goto sendresp; | |
2615 | } | |
2616 | ||
23691d75 GP |
2617 | parent = pchan->sk; |
2618 | ||
aa2ac881 | 2619 | lock_sock(parent); |
e0f0cb56 | 2620 | |
e7c29cb1 MH |
2621 | /* Check if the ACL is secure enough (if not SDP) */ |
2622 | if (psm != cpu_to_le16(0x0001) && | |
2623 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2624 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2625 | result = L2CAP_CR_SEC_BLOCK; |
2626 | goto response; | |
2627 | } | |
2628 | ||
1da177e4 LT |
2629 | result = L2CAP_CR_NO_MEM; |
2630 | ||
2631 | /* Check for backlog size */ | |
2632 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2633 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2634 | goto response; |
2635 | } | |
2636 | ||
80808e43 GP |
2637 | chan = pchan->ops->new_connection(pchan->data); |
2638 | if (!chan) | |
1da177e4 LT |
2639 | goto response; |
2640 | ||
80808e43 GP |
2641 | sk = chan->sk; |
2642 | ||
1da177e4 | 2643 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 2644 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 2645 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2646 | chan->ops->close(chan->data); |
1da177e4 LT |
2647 | goto response; |
2648 | } | |
2649 | ||
2650 | hci_conn_hold(conn->hcon); | |
2651 | ||
1da177e4 LT |
2652 | bacpy(&bt_sk(sk)->src, conn->src); |
2653 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2654 | chan->psm = psm; |
2655 | chan->dcid = scid; | |
1da177e4 | 2656 | |
d1010240 GP |
2657 | bt_accept_enqueue(parent, sk); |
2658 | ||
3d57dc68 | 2659 | l2cap_chan_add(conn, chan); |
48454079 | 2660 | |
fe4128e0 | 2661 | dcid = chan->scid; |
1da177e4 | 2662 | |
c9b66675 | 2663 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2664 | |
fc7f8a7e | 2665 | chan->ident = cmd->ident; |
1da177e4 | 2666 | |
984947dc | 2667 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 2668 | if (l2cap_chan_check_security(chan)) { |
f66dc81f | 2669 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2670 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2671 | result = L2CAP_CR_PEND; |
2672 | status = L2CAP_CS_AUTHOR_PEND; | |
2673 | parent->sk_data_ready(parent, 0); | |
2674 | } else { | |
89bc500e | 2675 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2676 | result = L2CAP_CR_SUCCESS; |
2677 | status = L2CAP_CS_NO_INFO; | |
2678 | } | |
79d554a6 | 2679 | } else { |
89bc500e | 2680 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2681 | result = L2CAP_CR_PEND; |
2682 | status = L2CAP_CS_AUTHEN_PEND; | |
2683 | } | |
2684 | } else { | |
89bc500e | 2685 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2686 | result = L2CAP_CR_PEND; |
2687 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2688 | } |
2689 | ||
1da177e4 | 2690 | response: |
aa2ac881 | 2691 | release_sock(parent); |
1da177e4 LT |
2692 | |
2693 | sendresp: | |
aca3192c YH |
2694 | rsp.scid = cpu_to_le16(scid); |
2695 | rsp.dcid = cpu_to_le16(dcid); | |
2696 | rsp.result = cpu_to_le16(result); | |
2697 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2698 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2699 | |
2700 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2701 | struct l2cap_info_req info; | |
2702 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2703 | ||
2704 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2705 | conn->info_ident = l2cap_get_ident(conn); | |
2706 | ||
f878fcad | 2707 | schedule_delayed_work(&conn->info_work, |
79d554a6 MH |
2708 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
2709 | ||
2710 | l2cap_send_cmd(conn, conn->info_ident, | |
2711 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2712 | } | |
2713 | ||
c1360a1c | 2714 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2715 | result == L2CAP_CR_SUCCESS) { |
2716 | u8 buf[128]; | |
c1360a1c | 2717 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2718 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2719 | l2cap_build_conf_req(chan, buf), buf); |
2720 | chan->num_conf_req++; | |
e9aeb2dd GP |
2721 | } |
2722 | ||
1da177e4 LT |
2723 | return 0; |
2724 | } | |
2725 | ||
2726 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2727 | { | |
2728 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2729 | u16 scid, dcid, result, status; | |
48454079 | 2730 | struct l2cap_chan *chan; |
1da177e4 LT |
2731 | struct sock *sk; |
2732 | u8 req[128]; | |
2733 | ||
2734 | scid = __le16_to_cpu(rsp->scid); | |
2735 | dcid = __le16_to_cpu(rsp->dcid); | |
2736 | result = __le16_to_cpu(rsp->result); | |
2737 | status = __le16_to_cpu(rsp->status); | |
2738 | ||
2739 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2740 | ||
2741 | if (scid) { | |
baa7e1fa | 2742 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2743 | if (!chan) |
57d3b22b | 2744 | return -EFAULT; |
1da177e4 | 2745 | } else { |
baa7e1fa | 2746 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2747 | if (!chan) |
57d3b22b | 2748 | return -EFAULT; |
1da177e4 LT |
2749 | } |
2750 | ||
48454079 GP |
2751 | sk = chan->sk; |
2752 | ||
1da177e4 LT |
2753 | switch (result) { |
2754 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2755 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2756 | chan->ident = 0; |
fe4128e0 | 2757 | chan->dcid = dcid; |
c1360a1c | 2758 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2759 | |
c1360a1c | 2760 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2761 | break; |
2762 | ||
1da177e4 | 2763 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2764 | l2cap_build_conf_req(chan, req), req); |
2765 | chan->num_conf_req++; | |
1da177e4 LT |
2766 | break; |
2767 | ||
2768 | case L2CAP_CR_PEND: | |
c1360a1c | 2769 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2770 | break; |
2771 | ||
2772 | default: | |
48454079 | 2773 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2774 | break; |
2775 | } | |
2776 | ||
aa2ac881 | 2777 | release_sock(sk); |
1da177e4 LT |
2778 | return 0; |
2779 | } | |
2780 | ||
47d1ec61 | 2781 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2782 | { |
2783 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2784 | * sides request it. | |
2785 | */ | |
0c1bc5c6 | 2786 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2787 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2788 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2789 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2790 | } |
2791 | ||
88219a0f | 2792 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2793 | { |
2794 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2795 | u16 dcid, flags; | |
2796 | u8 rsp[64]; | |
48454079 | 2797 | struct l2cap_chan *chan; |
1da177e4 | 2798 | struct sock *sk; |
5dee9e7c | 2799 | int len; |
1da177e4 LT |
2800 | |
2801 | dcid = __le16_to_cpu(req->dcid); | |
2802 | flags = __le16_to_cpu(req->flags); | |
2803 | ||
2804 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2805 | ||
baa7e1fa | 2806 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2807 | if (!chan) |
1da177e4 LT |
2808 | return -ENOENT; |
2809 | ||
48454079 GP |
2810 | sk = chan->sk; |
2811 | ||
033b1142 | 2812 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2813 | struct l2cap_cmd_rej_cid rej; |
2814 | ||
2815 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2816 | rej.scid = cpu_to_le16(chan->scid); | |
2817 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2818 | |
df6bd743 GP |
2819 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2820 | sizeof(rej), &rej); | |
354f60a9 | 2821 | goto unlock; |
df6bd743 | 2822 | } |
354f60a9 | 2823 | |
5dee9e7c | 2824 | /* Reject if config buffer is too small. */ |
88219a0f | 2825 | len = cmd_len - sizeof(*req); |
7ac28817 | 2826 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2827 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2828 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2829 | L2CAP_CONF_REJECT, flags), rsp); |
2830 | goto unlock; | |
2831 | } | |
2832 | ||
2833 | /* Store config. */ | |
73ffa904 GP |
2834 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2835 | chan->conf_len += len; | |
1da177e4 LT |
2836 | |
2837 | if (flags & 0x0001) { | |
2838 | /* Incomplete config. Send empty response. */ | |
2839 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2840 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2841 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2842 | goto unlock; |
2843 | } | |
2844 | ||
2845 | /* Complete config. */ | |
73ffa904 | 2846 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2847 | if (len < 0) { |
e92c8e70 | 2848 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2849 | goto unlock; |
f2fcfcd6 | 2850 | } |
1da177e4 | 2851 | |
5dee9e7c | 2852 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2853 | chan->num_conf_rsp++; |
5dee9e7c | 2854 | |
5dee9e7c | 2855 | /* Reset config buffer. */ |
73ffa904 | 2856 | chan->conf_len = 0; |
5dee9e7c | 2857 | |
c1360a1c | 2858 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2859 | goto unlock; |
2860 | ||
c1360a1c | 2861 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2862 | set_default_fcs(chan); |
fcc203c3 | 2863 | |
89bc500e | 2864 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2865 | |
42e5c802 GP |
2866 | chan->next_tx_seq = 0; |
2867 | chan->expected_tx_seq = 0; | |
58d35f87 | 2868 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2869 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2870 | l2cap_ertm_init(chan); |
0565c1c2 | 2871 | |
1da177e4 | 2872 | l2cap_chan_ready(sk); |
876d9484 MH |
2873 | goto unlock; |
2874 | } | |
2875 | ||
c1360a1c | 2876 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2877 | u8 buf[64]; |
1da177e4 | 2878 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2879 | l2cap_build_conf_req(chan, buf), buf); |
2880 | chan->num_conf_req++; | |
1da177e4 LT |
2881 | } |
2882 | ||
0e8b207e AE |
2883 | /* Got Conf Rsp PENDING from remote side and asume we sent |
2884 | Conf Rsp PENDING in the code above */ | |
2885 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
2886 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2887 | ||
2888 | /* check compatibility */ | |
2889 | ||
2890 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2891 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2892 | ||
2893 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2894 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
2895 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
2896 | } | |
2897 | ||
1da177e4 | 2898 | unlock: |
aa2ac881 | 2899 | release_sock(sk); |
1da177e4 LT |
2900 | return 0; |
2901 | } | |
2902 | ||
2903 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2904 | { | |
2905 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2906 | u16 scid, flags, result; | |
48454079 | 2907 | struct l2cap_chan *chan; |
1da177e4 | 2908 | struct sock *sk; |
7b1c0049 | 2909 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2910 | |
2911 | scid = __le16_to_cpu(rsp->scid); | |
2912 | flags = __le16_to_cpu(rsp->flags); | |
2913 | result = __le16_to_cpu(rsp->result); | |
2914 | ||
af05b30b GP |
2915 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2916 | scid, flags, result); | |
1da177e4 | 2917 | |
baa7e1fa | 2918 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2919 | if (!chan) |
1da177e4 LT |
2920 | return 0; |
2921 | ||
48454079 GP |
2922 | sk = chan->sk; |
2923 | ||
1da177e4 LT |
2924 | switch (result) { |
2925 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2926 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 2927 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
2928 | break; |
2929 | ||
0e8b207e AE |
2930 | case L2CAP_CONF_PENDING: |
2931 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
2932 | ||
2933 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2934 | char buf[64]; | |
2935 | ||
2936 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2937 | buf, &result); | |
2938 | if (len < 0) { | |
2939 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
2940 | goto done; | |
2941 | } | |
2942 | ||
2943 | /* check compatibility */ | |
2944 | ||
2945 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2946 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2947 | ||
2948 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2949 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
2950 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
2951 | } | |
2952 | goto done; | |
2953 | ||
1da177e4 | 2954 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 2955 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2956 | char req[64]; |
2957 | ||
c2c77ec8 | 2958 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2959 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2960 | goto done; |
2961 | } | |
2962 | ||
f2fcfcd6 GP |
2963 | /* throw out any old stored conf requests */ |
2964 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2965 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2966 | req, &result); | |
f2fcfcd6 | 2967 | if (len < 0) { |
e92c8e70 | 2968 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2969 | goto done; |
2970 | } | |
2971 | ||
2972 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2973 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2974 | chan->num_conf_req++; |
f2fcfcd6 GP |
2975 | if (result != L2CAP_CONF_SUCCESS) |
2976 | goto done; | |
2977 | break; | |
1da177e4 LT |
2978 | } |
2979 | ||
8e87d142 | 2980 | default: |
b1235d79 | 2981 | sk->sk_err = ECONNRESET; |
f3f668b0 | 2982 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 2983 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2984 | goto done; |
2985 | } | |
2986 | ||
2987 | if (flags & 0x01) | |
2988 | goto done; | |
2989 | ||
c1360a1c | 2990 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2991 | |
c1360a1c | 2992 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2993 | set_default_fcs(chan); |
fcc203c3 | 2994 | |
89bc500e | 2995 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2996 | chan->next_tx_seq = 0; |
2997 | chan->expected_tx_seq = 0; | |
58d35f87 | 2998 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2999 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 3000 | l2cap_ertm_init(chan); |
0565c1c2 | 3001 | |
1da177e4 LT |
3002 | l2cap_chan_ready(sk); |
3003 | } | |
3004 | ||
3005 | done: | |
aa2ac881 | 3006 | release_sock(sk); |
1da177e4 LT |
3007 | return 0; |
3008 | } | |
3009 | ||
3010 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3011 | { | |
3012 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3013 | struct l2cap_disconn_rsp rsp; | |
3014 | u16 dcid, scid; | |
48454079 | 3015 | struct l2cap_chan *chan; |
1da177e4 LT |
3016 | struct sock *sk; |
3017 | ||
3018 | scid = __le16_to_cpu(req->scid); | |
3019 | dcid = __le16_to_cpu(req->dcid); | |
3020 | ||
3021 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3022 | ||
baa7e1fa | 3023 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3024 | if (!chan) |
1da177e4 LT |
3025 | return 0; |
3026 | ||
48454079 GP |
3027 | sk = chan->sk; |
3028 | ||
fe4128e0 GP |
3029 | rsp.dcid = cpu_to_le16(chan->scid); |
3030 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3031 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3032 | ||
3033 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3034 | ||
48454079 | 3035 | l2cap_chan_del(chan, ECONNRESET); |
aa2ac881 | 3036 | release_sock(sk); |
1da177e4 | 3037 | |
ba3bd0ee | 3038 | chan->ops->close(chan->data); |
1da177e4 LT |
3039 | return 0; |
3040 | } | |
3041 | ||
3042 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3043 | { | |
3044 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3045 | u16 dcid, scid; | |
48454079 | 3046 | struct l2cap_chan *chan; |
1da177e4 LT |
3047 | struct sock *sk; |
3048 | ||
3049 | scid = __le16_to_cpu(rsp->scid); | |
3050 | dcid = __le16_to_cpu(rsp->dcid); | |
3051 | ||
3052 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3053 | ||
baa7e1fa | 3054 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3055 | if (!chan) |
1da177e4 LT |
3056 | return 0; |
3057 | ||
48454079 GP |
3058 | sk = chan->sk; |
3059 | ||
48454079 | 3060 | l2cap_chan_del(chan, 0); |
aa2ac881 | 3061 | release_sock(sk); |
1da177e4 | 3062 | |
ba3bd0ee | 3063 | chan->ops->close(chan->data); |
1da177e4 LT |
3064 | return 0; |
3065 | } | |
3066 | ||
3067 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3068 | { | |
3069 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3070 | u16 type; |
3071 | ||
3072 | type = __le16_to_cpu(req->type); | |
3073 | ||
3074 | BT_DBG("type 0x%4.4x", type); | |
3075 | ||
f0709e03 MH |
3076 | if (type == L2CAP_IT_FEAT_MASK) { |
3077 | u8 buf[8]; | |
44dd46de | 3078 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3079 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3080 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3081 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3082 | if (!disable_ertm) |
fcc203c3 GP |
3083 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3084 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3085 | if (enable_hs) |
6327eb98 AE |
3086 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3087 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3088 | |
1b7bf4ed | 3089 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3090 | l2cap_send_cmd(conn, cmd->ident, |
3091 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3092 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3093 | u8 buf[12]; | |
3094 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3095 | |
3096 | if (enable_hs) | |
3097 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3098 | else | |
3099 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3100 | ||
e1027a7c MH |
3101 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3102 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3103 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3104 | l2cap_send_cmd(conn, cmd->ident, |
3105 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3106 | } else { |
3107 | struct l2cap_info_rsp rsp; | |
3108 | rsp.type = cpu_to_le16(type); | |
3109 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3110 | l2cap_send_cmd(conn, cmd->ident, | |
3111 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3112 | } | |
1da177e4 LT |
3113 | |
3114 | return 0; | |
3115 | } | |
3116 | ||
3117 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3118 | { | |
3119 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3120 | u16 type, result; | |
3121 | ||
3122 | type = __le16_to_cpu(rsp->type); | |
3123 | result = __le16_to_cpu(rsp->result); | |
3124 | ||
3125 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3126 | ||
e90165be AE |
3127 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3128 | if (cmd->ident != conn->info_ident || | |
3129 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3130 | return 0; | |
3131 | ||
f878fcad | 3132 | cancel_delayed_work_sync(&conn->info_work); |
4e8402a3 | 3133 | |
adb08ede VT |
3134 | if (result != L2CAP_IR_SUCCESS) { |
3135 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3136 | conn->info_ident = 0; | |
3137 | ||
3138 | l2cap_conn_start(conn); | |
3139 | ||
3140 | return 0; | |
3141 | } | |
3142 | ||
984947dc | 3143 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3144 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3145 | |
47ec1dcd | 3146 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3147 | struct l2cap_info_req req; |
3148 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3149 | ||
3150 | conn->info_ident = l2cap_get_ident(conn); | |
3151 | ||
3152 | l2cap_send_cmd(conn, conn->info_ident, | |
3153 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3154 | } else { | |
3155 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3156 | conn->info_ident = 0; | |
3157 | ||
3158 | l2cap_conn_start(conn); | |
3159 | } | |
3160 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3161 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3162 | conn->info_ident = 0; |
984947dc MH |
3163 | |
3164 | l2cap_conn_start(conn); | |
3165 | } | |
4e8402a3 | 3166 | |
1da177e4 LT |
3167 | return 0; |
3168 | } | |
3169 | ||
f94ff6ff MM |
3170 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3171 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3172 | void *data) | |
3173 | { | |
3174 | struct l2cap_create_chan_req *req = data; | |
3175 | struct l2cap_create_chan_rsp rsp; | |
3176 | u16 psm, scid; | |
3177 | ||
3178 | if (cmd_len != sizeof(*req)) | |
3179 | return -EPROTO; | |
3180 | ||
3181 | if (!enable_hs) | |
3182 | return -EINVAL; | |
3183 | ||
3184 | psm = le16_to_cpu(req->psm); | |
3185 | scid = le16_to_cpu(req->scid); | |
3186 | ||
3187 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3188 | ||
3189 | /* Placeholder: Always reject */ | |
3190 | rsp.dcid = 0; | |
3191 | rsp.scid = cpu_to_le16(scid); | |
3192 | rsp.result = L2CAP_CR_NO_MEM; | |
3193 | rsp.status = L2CAP_CS_NO_INFO; | |
3194 | ||
3195 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3196 | sizeof(rsp), &rsp); | |
3197 | ||
3198 | return 0; | |
3199 | } | |
3200 | ||
3201 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3202 | struct l2cap_cmd_hdr *cmd, void *data) | |
3203 | { | |
3204 | BT_DBG("conn %p", conn); | |
3205 | ||
3206 | return l2cap_connect_rsp(conn, cmd, data); | |
3207 | } | |
3208 | ||
8d5a04a1 MM |
3209 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3210 | u16 icid, u16 result) | |
3211 | { | |
3212 | struct l2cap_move_chan_rsp rsp; | |
3213 | ||
3214 | BT_DBG("icid %d, result %d", icid, result); | |
3215 | ||
3216 | rsp.icid = cpu_to_le16(icid); | |
3217 | rsp.result = cpu_to_le16(result); | |
3218 | ||
3219 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3220 | } | |
3221 | ||
3222 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3223 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3224 | { | |
3225 | struct l2cap_move_chan_cfm cfm; | |
3226 | u8 ident; | |
3227 | ||
3228 | BT_DBG("icid %d, result %d", icid, result); | |
3229 | ||
3230 | ident = l2cap_get_ident(conn); | |
3231 | if (chan) | |
3232 | chan->ident = ident; | |
3233 | ||
3234 | cfm.icid = cpu_to_le16(icid); | |
3235 | cfm.result = cpu_to_le16(result); | |
3236 | ||
3237 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3238 | } | |
3239 | ||
3240 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3241 | u16 icid) | |
3242 | { | |
3243 | struct l2cap_move_chan_cfm_rsp rsp; | |
3244 | ||
3245 | BT_DBG("icid %d", icid); | |
3246 | ||
3247 | rsp.icid = cpu_to_le16(icid); | |
3248 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3249 | } | |
3250 | ||
3251 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3252 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3253 | { | |
3254 | struct l2cap_move_chan_req *req = data; | |
3255 | u16 icid = 0; | |
3256 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3257 | ||
3258 | if (cmd_len != sizeof(*req)) | |
3259 | return -EPROTO; | |
3260 | ||
3261 | icid = le16_to_cpu(req->icid); | |
3262 | ||
3263 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3264 | ||
3265 | if (!enable_hs) | |
3266 | return -EINVAL; | |
3267 | ||
3268 | /* Placeholder: Always refuse */ | |
3269 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3270 | ||
3271 | return 0; | |
3272 | } | |
3273 | ||
3274 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3275 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3276 | { | |
3277 | struct l2cap_move_chan_rsp *rsp = data; | |
3278 | u16 icid, result; | |
3279 | ||
3280 | if (cmd_len != sizeof(*rsp)) | |
3281 | return -EPROTO; | |
3282 | ||
3283 | icid = le16_to_cpu(rsp->icid); | |
3284 | result = le16_to_cpu(rsp->result); | |
3285 | ||
3286 | BT_DBG("icid %d, result %d", icid, result); | |
3287 | ||
3288 | /* Placeholder: Always unconfirmed */ | |
3289 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3290 | ||
3291 | return 0; | |
3292 | } | |
3293 | ||
3294 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3295 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3296 | { | |
3297 | struct l2cap_move_chan_cfm *cfm = data; | |
3298 | u16 icid, result; | |
3299 | ||
3300 | if (cmd_len != sizeof(*cfm)) | |
3301 | return -EPROTO; | |
3302 | ||
3303 | icid = le16_to_cpu(cfm->icid); | |
3304 | result = le16_to_cpu(cfm->result); | |
3305 | ||
3306 | BT_DBG("icid %d, result %d", icid, result); | |
3307 | ||
3308 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3309 | ||
3310 | return 0; | |
3311 | } | |
3312 | ||
3313 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3314 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3315 | { | |
3316 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3317 | u16 icid; | |
3318 | ||
3319 | if (cmd_len != sizeof(*rsp)) | |
3320 | return -EPROTO; | |
3321 | ||
3322 | icid = le16_to_cpu(rsp->icid); | |
3323 | ||
3324 | BT_DBG("icid %d", icid); | |
3325 | ||
3326 | return 0; | |
3327 | } | |
3328 | ||
e2174ca4 | 3329 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3330 | u16 to_multiplier) |
3331 | { | |
3332 | u16 max_latency; | |
3333 | ||
3334 | if (min > max || min < 6 || max > 3200) | |
3335 | return -EINVAL; | |
3336 | ||
3337 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3338 | return -EINVAL; | |
3339 | ||
3340 | if (max >= to_multiplier * 8) | |
3341 | return -EINVAL; | |
3342 | ||
3343 | max_latency = (to_multiplier * 8 / max) - 1; | |
3344 | if (latency > 499 || latency > max_latency) | |
3345 | return -EINVAL; | |
3346 | ||
3347 | return 0; | |
3348 | } | |
3349 | ||
3350 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3351 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3352 | { | |
3353 | struct hci_conn *hcon = conn->hcon; | |
3354 | struct l2cap_conn_param_update_req *req; | |
3355 | struct l2cap_conn_param_update_rsp rsp; | |
3356 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3357 | int err; |
de73115a CT |
3358 | |
3359 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3360 | return -EINVAL; | |
3361 | ||
3362 | cmd_len = __le16_to_cpu(cmd->len); | |
3363 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3364 | return -EPROTO; | |
3365 | ||
3366 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3367 | min = __le16_to_cpu(req->min); |
3368 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3369 | latency = __le16_to_cpu(req->latency); |
3370 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3371 | ||
3372 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3373 | min, max, latency, to_multiplier); | |
3374 | ||
3375 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3376 | |
3377 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3378 | if (err) | |
de73115a CT |
3379 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3380 | else | |
3381 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3382 | ||
3383 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3384 | sizeof(rsp), &rsp); | |
3385 | ||
2ce603eb CT |
3386 | if (!err) |
3387 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3388 | ||
de73115a CT |
3389 | return 0; |
3390 | } | |
3391 | ||
3300d9a9 CT |
3392 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3393 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3394 | { | |
3395 | int err = 0; | |
3396 | ||
3397 | switch (cmd->code) { | |
3398 | case L2CAP_COMMAND_REJ: | |
3399 | l2cap_command_rej(conn, cmd, data); | |
3400 | break; | |
3401 | ||
3402 | case L2CAP_CONN_REQ: | |
3403 | err = l2cap_connect_req(conn, cmd, data); | |
3404 | break; | |
3405 | ||
3406 | case L2CAP_CONN_RSP: | |
3407 | err = l2cap_connect_rsp(conn, cmd, data); | |
3408 | break; | |
3409 | ||
3410 | case L2CAP_CONF_REQ: | |
3411 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3412 | break; | |
3413 | ||
3414 | case L2CAP_CONF_RSP: | |
3415 | err = l2cap_config_rsp(conn, cmd, data); | |
3416 | break; | |
3417 | ||
3418 | case L2CAP_DISCONN_REQ: | |
3419 | err = l2cap_disconnect_req(conn, cmd, data); | |
3420 | break; | |
3421 | ||
3422 | case L2CAP_DISCONN_RSP: | |
3423 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3424 | break; | |
3425 | ||
3426 | case L2CAP_ECHO_REQ: | |
3427 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3428 | break; | |
3429 | ||
3430 | case L2CAP_ECHO_RSP: | |
3431 | break; | |
3432 | ||
3433 | case L2CAP_INFO_REQ: | |
3434 | err = l2cap_information_req(conn, cmd, data); | |
3435 | break; | |
3436 | ||
3437 | case L2CAP_INFO_RSP: | |
3438 | err = l2cap_information_rsp(conn, cmd, data); | |
3439 | break; | |
3440 | ||
f94ff6ff MM |
3441 | case L2CAP_CREATE_CHAN_REQ: |
3442 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3443 | break; | |
3444 | ||
3445 | case L2CAP_CREATE_CHAN_RSP: | |
3446 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3447 | break; | |
3448 | ||
8d5a04a1 MM |
3449 | case L2CAP_MOVE_CHAN_REQ: |
3450 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3451 | break; | |
3452 | ||
3453 | case L2CAP_MOVE_CHAN_RSP: | |
3454 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3455 | break; | |
3456 | ||
3457 | case L2CAP_MOVE_CHAN_CFM: | |
3458 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3459 | break; | |
3460 | ||
3461 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3462 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3463 | break; | |
3464 | ||
3300d9a9 CT |
3465 | default: |
3466 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3467 | err = -EINVAL; | |
3468 | break; | |
3469 | } | |
3470 | ||
3471 | return err; | |
3472 | } | |
3473 | ||
3474 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3475 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3476 | { | |
3477 | switch (cmd->code) { | |
3478 | case L2CAP_COMMAND_REJ: | |
3479 | return 0; | |
3480 | ||
3481 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3482 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3483 | |
3484 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3485 | return 0; | |
3486 | ||
3487 | default: | |
3488 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3489 | return -EINVAL; | |
3490 | } | |
3491 | } | |
3492 | ||
3493 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3494 | struct sk_buff *skb) | |
1da177e4 LT |
3495 | { |
3496 | u8 *data = skb->data; | |
3497 | int len = skb->len; | |
3498 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3499 | int err; |
1da177e4 LT |
3500 | |
3501 | l2cap_raw_recv(conn, skb); | |
3502 | ||
3503 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3504 | u16 cmd_len; |
1da177e4 LT |
3505 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3506 | data += L2CAP_CMD_HDR_SIZE; | |
3507 | len -= L2CAP_CMD_HDR_SIZE; | |
3508 | ||
88219a0f | 3509 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3510 | |
88219a0f | 3511 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3512 | |
88219a0f | 3513 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3514 | BT_DBG("corrupted command"); |
3515 | break; | |
3516 | } | |
3517 | ||
3300d9a9 CT |
3518 | if (conn->hcon->type == LE_LINK) |
3519 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3520 | else | |
3521 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3522 | |
3523 | if (err) { | |
e2fd318e | 3524 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3525 | |
3526 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3527 | |
3528 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3529 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3530 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3531 | } | |
3532 | ||
88219a0f AV |
3533 | data += cmd_len; |
3534 | len -= cmd_len; | |
1da177e4 LT |
3535 | } |
3536 | ||
3537 | kfree_skb(skb); | |
3538 | } | |
3539 | ||
47d1ec61 | 3540 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3541 | { |
3542 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3543 | int hdr_size; |
3544 | ||
3545 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3546 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3547 | else | |
3548 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3549 | |
47d1ec61 | 3550 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3551 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3552 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3553 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3554 | ||
3555 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3556 | return -EBADMSG; |
fcc203c3 GP |
3557 | } |
3558 | return 0; | |
3559 | } | |
3560 | ||
525cd185 | 3561 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3562 | { |
88843ab0 | 3563 | u32 control = 0; |
d5392c8f | 3564 | |
6a026610 | 3565 | chan->frames_sent = 0; |
d5392c8f | 3566 | |
0b209fae | 3567 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3568 | |
e2ab4353 | 3569 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3570 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3571 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3572 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3573 | } |
3574 | ||
e2ab4353 | 3575 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3576 | l2cap_retransmit_frames(chan); |
d5392c8f | 3577 | |
525cd185 | 3578 | l2cap_ertm_send(chan); |
d5392c8f | 3579 | |
e2ab4353 | 3580 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3581 | chan->frames_sent == 0) { |
ab784b73 | 3582 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3583 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3584 | } |
3585 | } | |
3586 | ||
fb45de7d | 3587 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3588 | { |
3589 | struct sk_buff *next_skb; | |
bfbacc11 | 3590 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3591 | |
3592 | bt_cb(skb)->tx_seq = tx_seq; | |
3593 | bt_cb(skb)->sar = sar; | |
3594 | ||
f1c6775b | 3595 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3596 | |
836be934 | 3597 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 3598 | |
039d9572 | 3599 | while (next_skb) { |
9b53350d JPRV |
3600 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3601 | return -EINVAL; | |
3602 | ||
836be934 AE |
3603 | next_tx_seq_offset = __seq_offset(chan, |
3604 | bt_cb(next_skb)->tx_seq, chan->buffer_seq); | |
bfbacc11 JPRV |
3605 | |
3606 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3607 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3608 | return 0; |
8f17154f GP |
3609 | } |
3610 | ||
f1c6775b | 3611 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
3612 | next_skb = NULL; |
3613 | else | |
3614 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
3615 | } | |
8f17154f | 3616 | |
f1c6775b | 3617 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3618 | |
3619 | return 0; | |
8f17154f GP |
3620 | } |
3621 | ||
84084a31 MM |
3622 | static void append_skb_frag(struct sk_buff *skb, |
3623 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3624 | { |
84084a31 MM |
3625 | /* skb->len reflects data in skb as well as all fragments |
3626 | * skb->data_len reflects only data in fragments | |
3627 | */ | |
3628 | if (!skb_has_frag_list(skb)) | |
3629 | skb_shinfo(skb)->frag_list = new_frag; | |
3630 | ||
3631 | new_frag->next = NULL; | |
3632 | ||
3633 | (*last_frag)->next = new_frag; | |
3634 | *last_frag = new_frag; | |
3635 | ||
3636 | skb->len += new_frag->len; | |
3637 | skb->data_len += new_frag->len; | |
3638 | skb->truesize += new_frag->truesize; | |
3639 | } | |
3640 | ||
88843ab0 | 3641 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
3642 | { |
3643 | int err = -EINVAL; | |
18778a63 | 3644 | |
7e0ef6ee AE |
3645 | switch (__get_ctrl_sar(chan, control)) { |
3646 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3647 | if (chan->sdu) |
3648 | break; | |
18778a63 | 3649 | |
84084a31 MM |
3650 | err = chan->ops->recv(chan->data, skb); |
3651 | break; | |
18778a63 | 3652 | |
7e0ef6ee | 3653 | case L2CAP_SAR_START: |
84084a31 MM |
3654 | if (chan->sdu) |
3655 | break; | |
18778a63 | 3656 | |
6f61fd47 | 3657 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 3658 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 3659 | |
84084a31 MM |
3660 | if (chan->sdu_len > chan->imtu) { |
3661 | err = -EMSGSIZE; | |
3662 | break; | |
3663 | } | |
1890d36b | 3664 | |
84084a31 MM |
3665 | if (skb->len >= chan->sdu_len) |
3666 | break; | |
18778a63 | 3667 | |
84084a31 MM |
3668 | chan->sdu = skb; |
3669 | chan->sdu_last_frag = skb; | |
18778a63 | 3670 | |
84084a31 MM |
3671 | skb = NULL; |
3672 | err = 0; | |
18778a63 GP |
3673 | break; |
3674 | ||
7e0ef6ee | 3675 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3676 | if (!chan->sdu) |
84084a31 | 3677 | break; |
18778a63 | 3678 | |
84084a31 MM |
3679 | append_skb_frag(chan->sdu, skb, |
3680 | &chan->sdu_last_frag); | |
3681 | skb = NULL; | |
18778a63 | 3682 | |
84084a31 MM |
3683 | if (chan->sdu->len >= chan->sdu_len) |
3684 | break; | |
4178ba46 | 3685 | |
84084a31 | 3686 | err = 0; |
18778a63 GP |
3687 | break; |
3688 | ||
7e0ef6ee | 3689 | case L2CAP_SAR_END: |
6f61fd47 | 3690 | if (!chan->sdu) |
84084a31 | 3691 | break; |
18778a63 | 3692 | |
84084a31 MM |
3693 | append_skb_frag(chan->sdu, skb, |
3694 | &chan->sdu_last_frag); | |
3695 | skb = NULL; | |
4178ba46 | 3696 | |
84084a31 MM |
3697 | if (chan->sdu->len != chan->sdu_len) |
3698 | break; | |
18778a63 | 3699 | |
84084a31 | 3700 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3701 | |
84084a31 MM |
3702 | if (!err) { |
3703 | /* Reassembly complete */ | |
3704 | chan->sdu = NULL; | |
3705 | chan->sdu_last_frag = NULL; | |
3706 | chan->sdu_len = 0; | |
1890d36b | 3707 | } |
18778a63 GP |
3708 | break; |
3709 | } | |
3710 | ||
84084a31 MM |
3711 | if (err) { |
3712 | kfree_skb(skb); | |
3713 | kfree_skb(chan->sdu); | |
3714 | chan->sdu = NULL; | |
3715 | chan->sdu_last_frag = NULL; | |
3716 | chan->sdu_len = 0; | |
3717 | } | |
18778a63 | 3718 | |
84084a31 | 3719 | return err; |
18778a63 GP |
3720 | } |
3721 | ||
26f880d2 | 3722 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3723 | { |
88843ab0 | 3724 | u32 control; |
712132eb | 3725 | |
26f880d2 | 3726 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3727 | |
26f880d2 MM |
3728 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3729 | ||
0b209fae | 3730 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 | 3731 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
26f880d2 MM |
3732 | l2cap_send_sframe(chan, control); |
3733 | ||
3734 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3735 | ||
3736 | __clear_ack_timer(chan); | |
3737 | } | |
3738 | ||
3739 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3740 | { | |
88843ab0 | 3741 | u32 control; |
712132eb | 3742 | |
e2ab4353 | 3743 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3744 | goto done; |
3745 | ||
0b209fae | 3746 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 3747 | control |= __set_ctrl_poll(chan); |
ab784b73 | 3748 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3749 | l2cap_send_sframe(chan, control); |
6a026610 | 3750 | chan->retry_count = 1; |
712132eb | 3751 | |
1a09bcb9 GP |
3752 | __clear_retrans_timer(chan); |
3753 | __set_monitor_timer(chan); | |
712132eb | 3754 | |
e2ab4353 | 3755 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3756 | |
3757 | done: | |
e2ab4353 GP |
3758 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3759 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3760 | |
49208c9c | 3761 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3762 | } |
3763 | ||
e328140f | 3764 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3765 | { |
e328140f MM |
3766 | if (chan->mode == L2CAP_MODE_ERTM) { |
3767 | if (busy) | |
3768 | l2cap_ertm_enter_local_busy(chan); | |
3769 | else | |
3770 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3771 | } |
1890d36b GP |
3772 | } |
3773 | ||
fb45de7d | 3774 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3775 | { |
3776 | struct sk_buff *skb; | |
88843ab0 | 3777 | u32 control; |
8f17154f | 3778 | |
e328140f MM |
3779 | while ((skb = skb_peek(&chan->srej_q)) && |
3780 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3781 | int err; | |
3782 | ||
8f17154f GP |
3783 | if (bt_cb(skb)->tx_seq != tx_seq) |
3784 | break; | |
3785 | ||
f1c6775b | 3786 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3787 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3788 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3789 | |
3790 | if (err < 0) { | |
3791 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3792 | break; | |
3793 | } | |
3794 | ||
836be934 AE |
3795 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
3796 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
3797 | } |
3798 | } | |
3799 | ||
fb45de7d | 3800 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3801 | { |
8f17154f | 3802 | struct srej_list *l, *tmp; |
88843ab0 | 3803 | u32 control; |
8f17154f | 3804 | |
39d5a3ee | 3805 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3806 | if (l->tx_seq == tx_seq) { |
3807 | list_del(&l->list); | |
3808 | kfree(l); | |
3809 | return; | |
3810 | } | |
ab784b73 | 3811 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3812 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3813 | l2cap_send_sframe(chan, control); |
8f17154f | 3814 | list_del(&l->list); |
39d5a3ee | 3815 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3816 | } |
3817 | } | |
3818 | ||
aef89f21 | 3819 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3820 | { |
8f17154f | 3821 | struct srej_list *new; |
88843ab0 | 3822 | u32 control; |
8f17154f | 3823 | |
42e5c802 | 3824 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3825 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3826 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3827 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3828 | |
3829 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
3830 | if (!new) |
3831 | return -ENOMEM; | |
3832 | ||
42e5c802 | 3833 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
3834 | |
3835 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
3836 | ||
39d5a3ee | 3837 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3838 | } |
836be934 AE |
3839 | |
3840 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
3841 | |
3842 | return 0; | |
8f17154f GP |
3843 | } |
3844 | ||
88843ab0 | 3845 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 3846 | { |
fb45de7d | 3847 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3848 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3849 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3850 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3851 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3852 | int err = 0; |
3853 | ||
88843ab0 | 3854 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 3855 | tx_seq, rx_control); |
1c2acffb | 3856 | |
03f6715d | 3857 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 3858 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3859 | __clear_monitor_timer(chan); |
6a026610 | 3860 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3861 | __set_retrans_timer(chan); |
e2ab4353 | 3862 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3863 | } |
3864 | ||
42e5c802 GP |
3865 | chan->expected_ack_seq = req_seq; |
3866 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3867 | |
836be934 | 3868 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
3869 | |
3870 | /* invalid tx_seq */ | |
47d1ec61 | 3871 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3872 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3873 | goto drop; |
3874 | } | |
3875 | ||
e2ab4353 | 3876 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3877 | goto drop; |
3878 | ||
02f1b641 MM |
3879 | if (tx_seq == chan->expected_tx_seq) |
3880 | goto expected; | |
3881 | ||
e2ab4353 | 3882 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3883 | struct srej_list *first; |
30afb5b2 | 3884 | |
39d5a3ee | 3885 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3886 | struct srej_list, list); |
3887 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3888 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3889 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3890 | |
3891 | list_del(&first->list); | |
3892 | kfree(first); | |
3893 | ||
39d5a3ee | 3894 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3895 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3896 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3897 | l2cap_send_ack(chan); |
49208c9c | 3898 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3899 | } |
3900 | } else { | |
3901 | struct srej_list *l; | |
9b53350d JPRV |
3902 | |
3903 | /* duplicated tx_seq */ | |
42e5c802 | 3904 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3905 | goto drop; |
8f17154f | 3906 | |
39d5a3ee | 3907 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3908 | if (l->tx_seq == tx_seq) { |
525cd185 | 3909 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3910 | return 0; |
3911 | } | |
3912 | } | |
aef89f21 SJ |
3913 | |
3914 | err = l2cap_send_srejframe(chan, tx_seq); | |
3915 | if (err < 0) { | |
3916 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3917 | return err; | |
3918 | } | |
30afb5b2 GP |
3919 | } |
3920 | } else { | |
836be934 AE |
3921 | expected_tx_seq_offset = __seq_offset(chan, |
3922 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
3923 | |
3924 | /* duplicated tx_seq */ | |
3925 | if (tx_seq_offset < expected_tx_seq_offset) | |
3926 | goto drop; | |
3927 | ||
e2ab4353 | 3928 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3929 | |
49208c9c | 3930 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3931 | |
39d5a3ee | 3932 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3933 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3934 | |
f1c6775b | 3935 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3936 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3937 | |
e2ab4353 | 3938 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3939 | |
aef89f21 SJ |
3940 | err = l2cap_send_srejframe(chan, tx_seq); |
3941 | if (err < 0) { | |
3942 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3943 | return err; | |
3944 | } | |
7fe9b298 | 3945 | |
1a09bcb9 | 3946 | __clear_ack_timer(chan); |
1c2acffb | 3947 | } |
30afb5b2 GP |
3948 | return 0; |
3949 | ||
8f17154f | 3950 | expected: |
836be934 | 3951 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 3952 | |
e2ab4353 | 3953 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3954 | bt_cb(skb)->tx_seq = tx_seq; |
3955 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3956 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3957 | return 0; |
3958 | } | |
3959 | ||
84084a31 | 3960 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
3961 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
3962 | ||
e328140f MM |
3963 | if (err < 0) { |
3964 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3965 | return err; | |
3966 | } | |
2ece3684 | 3967 | |
03f6715d | 3968 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3969 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3970 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3971 | } |
3972 | ||
c1b4f43b | 3973 | |
6a026610 GP |
3974 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3975 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3976 | l2cap_send_ack(chan); |
4d611e4d GP |
3977 | else |
3978 | __set_ack_timer(chan); | |
9e917af1 | 3979 | |
8f17154f | 3980 | return 0; |
9b53350d JPRV |
3981 | |
3982 | drop: | |
3983 | kfree_skb(skb); | |
3984 | return 0; | |
1c2acffb GP |
3985 | } |
3986 | ||
88843ab0 | 3987 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 3988 | { |
88843ab0 | 3989 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 3990 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 3991 | |
0b209fae | 3992 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 3993 | l2cap_drop_acked_frames(chan); |
1c2acffb | 3994 | |
e3781735 | 3995 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
3996 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3997 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3998 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3999 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4000 | __set_retrans_timer(chan); |
05fbd89d | 4001 | |
e2ab4353 | 4002 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4003 | l2cap_send_srejtail(chan); |
05fbd89d | 4004 | } else { |
525cd185 | 4005 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4006 | } |
1d8f5d16 | 4007 | |
03f6715d | 4008 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4009 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4010 | |
e2ab4353 | 4011 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4012 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4013 | |
e072745f | 4014 | } else { |
e2ab4353 | 4015 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4016 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4017 | __set_retrans_timer(chan); |
1c2acffb | 4018 | |
e2ab4353 GP |
4019 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4020 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4021 | l2cap_send_ack(chan); |
894718a6 | 4022 | else |
525cd185 | 4023 | l2cap_ertm_send(chan); |
e072745f GP |
4024 | } |
4025 | } | |
2246b2f1 | 4026 | |
88843ab0 | 4027 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4028 | { |
0b209fae | 4029 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4030 | |
88843ab0 | 4031 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4032 | |
e2ab4353 | 4033 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4034 | |
42e5c802 GP |
4035 | chan->expected_ack_seq = tx_seq; |
4036 | l2cap_drop_acked_frames(chan); | |
e072745f | 4037 | |
03f6715d | 4038 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4039 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4040 | l2cap_retransmit_frames(chan); |
e072745f | 4041 | } else { |
525cd185 | 4042 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4043 | |
e2ab4353 GP |
4044 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4045 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4046 | } |
4047 | } | |
88843ab0 | 4048 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4049 | { |
0b209fae | 4050 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4051 | |
88843ab0 | 4052 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4053 | |
e2ab4353 | 4054 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4055 | |
e3781735 | 4056 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4057 | chan->expected_ack_seq = tx_seq; |
4058 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4059 | |
e2ab4353 | 4060 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4061 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4062 | |
525cd185 | 4063 | l2cap_ertm_send(chan); |
dfc909be | 4064 | |
e2ab4353 | 4065 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4066 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4067 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4068 | } |
03f6715d | 4069 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4070 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4071 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4072 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4073 | else |
525cd185 | 4074 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4075 | } else { |
525cd185 | 4076 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4077 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4078 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4079 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4080 | } |
e072745f GP |
4081 | } |
4082 | } | |
4083 | ||
88843ab0 | 4084 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4085 | { |
0b209fae | 4086 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4087 | |
88843ab0 | 4088 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4089 | |
e2ab4353 | 4090 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4091 | chan->expected_ack_seq = tx_seq; |
4092 | l2cap_drop_acked_frames(chan); | |
e072745f | 4093 | |
e3781735 | 4094 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4095 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4096 | |
e2ab4353 | 4097 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4098 | __clear_retrans_timer(chan); |
e3781735 | 4099 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4100 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4101 | return; |
e072745f | 4102 | } |
99b0d4b7 | 4103 | |
e3781735 | 4104 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4105 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4106 | } else { |
4107 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4108 | l2cap_send_sframe(chan, rx_control); | |
4109 | } | |
e072745f GP |
4110 | } |
4111 | ||
88843ab0 | 4112 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4113 | { |
88843ab0 | 4114 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4115 | |
03f6715d | 4116 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4117 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4118 | __clear_monitor_timer(chan); |
6a026610 | 4119 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4120 | __set_retrans_timer(chan); |
e2ab4353 | 4121 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4122 | } |
4123 | ||
ab784b73 AE |
4124 | switch (__get_ctrl_super(chan, rx_control)) { |
4125 | case L2CAP_SUPER_RR: | |
525cd185 | 4126 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4127 | break; |
4128 | ||
ab784b73 | 4129 | case L2CAP_SUPER_REJ: |
525cd185 | 4130 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4131 | break; |
2246b2f1 | 4132 | |
ab784b73 | 4133 | case L2CAP_SUPER_SREJ: |
525cd185 | 4134 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4135 | break; |
4136 | ||
ab784b73 | 4137 | case L2CAP_SUPER_RNR: |
525cd185 | 4138 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4139 | break; |
4140 | } | |
4141 | ||
faaebd19 | 4142 | kfree_skb(skb); |
1c2acffb GP |
4143 | return 0; |
4144 | } | |
4145 | ||
218bb9df GP |
4146 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4147 | { | |
525cd185 | 4148 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
88843ab0 | 4149 | u32 control; |
0b209fae | 4150 | u16 req_seq; |
218bb9df GP |
4151 | int len, next_tx_seq_offset, req_seq_offset; |
4152 | ||
88843ab0 AE |
4153 | control = __get_control(chan, skb->data); |
4154 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4155 | len = skb->len; |
4156 | ||
4157 | /* | |
4158 | * We can just drop the corrupted I-frame here. | |
4159 | * Receiver will miss it and start proper recovery | |
4160 | * procedures and ask retransmission. | |
4161 | */ | |
47d1ec61 | 4162 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4163 | goto drop; |
4164 | ||
793c2f1c | 4165 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4166 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4167 | |
47d1ec61 | 4168 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4169 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4170 | |
47d1ec61 | 4171 | if (len > chan->mps) { |
8c1d787b | 4172 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4173 | goto drop; |
4174 | } | |
4175 | ||
0b209fae | 4176 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4177 | |
836be934 AE |
4178 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4179 | ||
4180 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4181 | chan->expected_ack_seq); | |
218bb9df GP |
4182 | |
4183 | /* check for invalid req-seq */ | |
4184 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4185 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4186 | goto drop; |
4187 | } | |
4188 | ||
793c2f1c | 4189 | if (!__is_sframe(chan, control)) { |
218bb9df | 4190 | if (len < 0) { |
8c1d787b | 4191 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4192 | goto drop; |
4193 | } | |
4194 | ||
525cd185 | 4195 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4196 | } else { |
4197 | if (len != 0) { | |
4198 | BT_ERR("%d", len); | |
8c1d787b | 4199 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4200 | goto drop; |
4201 | } | |
4202 | ||
525cd185 | 4203 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4204 | } |
4205 | ||
4206 | return 0; | |
4207 | ||
4208 | drop: | |
4209 | kfree_skb(skb); | |
4210 | return 0; | |
4211 | } | |
4212 | ||
1da177e4 LT |
4213 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4214 | { | |
48454079 | 4215 | struct l2cap_chan *chan; |
bf734843 | 4216 | struct sock *sk = NULL; |
88843ab0 | 4217 | u32 control; |
fb45de7d | 4218 | u16 tx_seq; |
218bb9df | 4219 | int len; |
1da177e4 | 4220 | |
baa7e1fa | 4221 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4222 | if (!chan) { |
1da177e4 LT |
4223 | BT_DBG("unknown cid 0x%4.4x", cid); |
4224 | goto drop; | |
4225 | } | |
4226 | ||
48454079 | 4227 | sk = chan->sk; |
6840ed07 | 4228 | |
49208c9c | 4229 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4230 | |
89bc500e | 4231 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4232 | goto drop; |
4233 | ||
0c1bc5c6 | 4234 | switch (chan->mode) { |
1c2acffb GP |
4235 | case L2CAP_MODE_BASIC: |
4236 | /* If socket recv buffers overflows we drop data here | |
4237 | * which is *bad* because L2CAP has to be reliable. | |
4238 | * But we don't have any other choice. L2CAP doesn't | |
4239 | * provide flow control mechanism. */ | |
1da177e4 | 4240 | |
0c1bc5c6 | 4241 | if (chan->imtu < skb->len) |
1c2acffb | 4242 | goto drop; |
1da177e4 | 4243 | |
23070494 | 4244 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4245 | goto done; |
4246 | break; | |
4247 | ||
4248 | case L2CAP_MODE_ERTM: | |
eb403a1b | 4249 | l2cap_ertm_data_rcv(sk, skb); |
1c2acffb | 4250 | |
fcafde2e | 4251 | goto done; |
1c2acffb | 4252 | |
6840ed07 | 4253 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4254 | control = __get_control(chan, skb->data); |
4255 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4256 | len = skb->len; |
4257 | ||
47d1ec61 | 4258 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4259 | goto drop; |
4260 | ||
7e0ef6ee | 4261 | if (__is_sar_start(chan, control)) |
03a51213 | 4262 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4263 | |
47d1ec61 | 4264 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4265 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4266 | |
793c2f1c | 4267 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4268 | goto drop; |
4269 | ||
fb45de7d | 4270 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4271 | |
84084a31 MM |
4272 | if (chan->expected_tx_seq != tx_seq) { |
4273 | /* Frame(s) missing - must discard partial SDU */ | |
4274 | kfree_skb(chan->sdu); | |
4275 | chan->sdu = NULL; | |
4276 | chan->sdu_last_frag = NULL; | |
4277 | chan->sdu_len = 0; | |
6840ed07 | 4278 | |
84084a31 MM |
4279 | /* TODO: Notify userland of missing data */ |
4280 | } | |
4281 | ||
836be934 | 4282 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4283 | |
4284 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4285 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4286 | |
4287 | goto done; | |
4288 | ||
1c2acffb | 4289 | default: |
0c1bc5c6 | 4290 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4291 | break; |
4292 | } | |
1da177e4 LT |
4293 | |
4294 | drop: | |
4295 | kfree_skb(skb); | |
4296 | ||
4297 | done: | |
0139418c | 4298 | if (sk) |
aa2ac881 | 4299 | release_sock(sk); |
0139418c | 4300 | |
1da177e4 LT |
4301 | return 0; |
4302 | } | |
4303 | ||
8e036fc3 | 4304 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4305 | { |
6dcae1ea | 4306 | struct sock *sk = NULL; |
23691d75 | 4307 | struct l2cap_chan *chan; |
1da177e4 | 4308 | |
23691d75 GP |
4309 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
4310 | if (!chan) | |
1da177e4 LT |
4311 | goto drop; |
4312 | ||
23691d75 GP |
4313 | sk = chan->sk; |
4314 | ||
aa2ac881 | 4315 | lock_sock(sk); |
e0f0cb56 | 4316 | |
1da177e4 LT |
4317 | BT_DBG("sk %p, len %d", sk, skb->len); |
4318 | ||
89bc500e | 4319 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4320 | goto drop; |
4321 | ||
e13e21dc | 4322 | if (chan->imtu < skb->len) |
1da177e4 LT |
4323 | goto drop; |
4324 | ||
23070494 | 4325 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
4326 | goto done; |
4327 | ||
4328 | drop: | |
4329 | kfree_skb(skb); | |
4330 | ||
4331 | done: | |
af05b30b | 4332 | if (sk) |
aa2ac881 | 4333 | release_sock(sk); |
1da177e4 LT |
4334 | return 0; |
4335 | } | |
4336 | ||
9f69bda6 GP |
4337 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
4338 | { | |
6dcae1ea | 4339 | struct sock *sk = NULL; |
23691d75 | 4340 | struct l2cap_chan *chan; |
9f69bda6 | 4341 | |
23691d75 GP |
4342 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4343 | if (!chan) | |
9f69bda6 GP |
4344 | goto drop; |
4345 | ||
23691d75 GP |
4346 | sk = chan->sk; |
4347 | ||
aa2ac881 | 4348 | lock_sock(sk); |
9f69bda6 GP |
4349 | |
4350 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4351 | ||
89bc500e | 4352 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4353 | goto drop; |
4354 | ||
e13e21dc | 4355 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4356 | goto drop; |
4357 | ||
23070494 | 4358 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
4359 | goto done; |
4360 | ||
4361 | drop: | |
4362 | kfree_skb(skb); | |
4363 | ||
4364 | done: | |
4365 | if (sk) | |
aa2ac881 | 4366 | release_sock(sk); |
9f69bda6 GP |
4367 | return 0; |
4368 | } | |
4369 | ||
1da177e4 LT |
4370 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4371 | { | |
4372 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4373 | u16 cid, len; |
4374 | __le16 psm; | |
1da177e4 LT |
4375 | |
4376 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4377 | cid = __le16_to_cpu(lh->cid); | |
4378 | len = __le16_to_cpu(lh->len); | |
4379 | ||
1c2acffb GP |
4380 | if (len != skb->len) { |
4381 | kfree_skb(skb); | |
4382 | return; | |
4383 | } | |
4384 | ||
1da177e4 LT |
4385 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4386 | ||
4387 | switch (cid) { | |
3300d9a9 | 4388 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4389 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4390 | l2cap_sig_channel(conn, skb); |
4391 | break; | |
4392 | ||
8db4dc46 | 4393 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4394 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4395 | skb_pull(skb, 2); |
4396 | l2cap_conless_channel(conn, psm, skb); | |
4397 | break; | |
4398 | ||
9f69bda6 GP |
4399 | case L2CAP_CID_LE_DATA: |
4400 | l2cap_att_channel(conn, cid, skb); | |
4401 | break; | |
4402 | ||
b501d6a1 AB |
4403 | case L2CAP_CID_SMP: |
4404 | if (smp_sig_channel(conn, skb)) | |
4405 | l2cap_conn_del(conn->hcon, EACCES); | |
4406 | break; | |
4407 | ||
1da177e4 LT |
4408 | default: |
4409 | l2cap_data_channel(conn, cid, skb); | |
4410 | break; | |
4411 | } | |
4412 | } | |
4413 | ||
4414 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4415 | ||
4416 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4417 | { | |
4418 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4419 | struct l2cap_chan *c; |
1da177e4 LT |
4420 | |
4421 | if (type != ACL_LINK) | |
963cf687 | 4422 | return -EINVAL; |
1da177e4 LT |
4423 | |
4424 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4425 | ||
4426 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4427 | read_lock(&chan_list_lock); |
4428 | list_for_each_entry(c, &chan_list, global_l) { | |
4429 | struct sock *sk = c->sk; | |
4343478f | 4430 | |
89bc500e | 4431 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4432 | continue; |
4433 | ||
4434 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4435 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4436 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4437 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4438 | exact++; |
2af6b9d5 MH |
4439 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4440 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4441 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4442 | lm2 |= HCI_LM_MASTER; |
4443 | } | |
1da177e4 | 4444 | } |
23691d75 | 4445 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4446 | |
4447 | return exact ? lm1 : lm2; | |
4448 | } | |
4449 | ||
4450 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4451 | { | |
0139418c MH |
4452 | struct l2cap_conn *conn; |
4453 | ||
1da177e4 LT |
4454 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4455 | ||
acd7d370 | 4456 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4457 | return -EINVAL; |
1da177e4 LT |
4458 | |
4459 | if (!status) { | |
1da177e4 LT |
4460 | conn = l2cap_conn_add(hcon, status); |
4461 | if (conn) | |
4462 | l2cap_conn_ready(conn); | |
0139418c | 4463 | } else |
e175072f | 4464 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4465 | |
4466 | return 0; | |
4467 | } | |
4468 | ||
2950f21a MH |
4469 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4470 | { | |
4471 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4472 | ||
4473 | BT_DBG("hcon %p", hcon); | |
4474 | ||
b5694506 | 4475 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
9f5a0d7b | 4476 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4477 | |
4478 | return conn->disc_reason; | |
4479 | } | |
4480 | ||
4481 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4482 | { |
4483 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4484 | ||
acd7d370 | 4485 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4486 | return -EINVAL; |
1da177e4 | 4487 | |
e175072f | 4488 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4489 | |
1da177e4 LT |
4490 | return 0; |
4491 | } | |
4492 | ||
4343478f | 4493 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4494 | { |
715ec005 | 4495 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4496 | return; |
4497 | ||
f62e4323 | 4498 | if (encrypt == 0x00) { |
4343478f | 4499 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 | 4500 | __clear_chan_timer(chan); |
f3f668b0 | 4501 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4502 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4503 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4504 | } else { |
4343478f | 4505 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4506 | __clear_chan_timer(chan); |
f62e4323 MH |
4507 | } |
4508 | } | |
4509 | ||
8c1b2355 | 4510 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4511 | { |
0139418c | 4512 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4513 | struct l2cap_chan *chan; |
1da177e4 | 4514 | |
0139418c | 4515 | if (!conn) |
1da177e4 | 4516 | return 0; |
0139418c | 4517 | |
1da177e4 LT |
4518 | BT_DBG("conn %p", conn); |
4519 | ||
160dc6ac VCG |
4520 | if (hcon->type == LE_LINK) { |
4521 | smp_distribute_keys(conn, 0); | |
6c9d42a1 | 4522 | cancel_delayed_work_sync(&conn->security_timer); |
160dc6ac VCG |
4523 | } |
4524 | ||
3d57dc68 | 4525 | rcu_read_lock(); |
1da177e4 | 4526 | |
3d57dc68 | 4527 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 4528 | struct sock *sk = chan->sk; |
baa7e1fa | 4529 | |
1da177e4 LT |
4530 | bh_lock_sock(sk); |
4531 | ||
f1cb9af5 VCG |
4532 | BT_DBG("chan->scid %d", chan->scid); |
4533 | ||
4534 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4535 | if (!status && encrypt) { | |
4536 | chan->sec_level = hcon->sec_level; | |
4537 | l2cap_chan_ready(sk); | |
4538 | } | |
4539 | ||
4540 | bh_unlock_sock(sk); | |
4541 | continue; | |
4542 | } | |
4543 | ||
c1360a1c | 4544 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4545 | bh_unlock_sock(sk); |
4546 | continue; | |
4547 | } | |
4548 | ||
89bc500e GP |
4549 | if (!status && (chan->state == BT_CONNECTED || |
4550 | chan->state == BT_CONFIG)) { | |
4343478f | 4551 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4552 | bh_unlock_sock(sk); |
4553 | continue; | |
4554 | } | |
4555 | ||
89bc500e | 4556 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4557 | if (!status) { |
4558 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4559 | req.scid = cpu_to_le16(chan->scid); |
4560 | req.psm = chan->psm; | |
1da177e4 | 4561 | |
fc7f8a7e | 4562 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4563 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4564 | |
fc7f8a7e | 4565 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4566 | L2CAP_CONN_REQ, sizeof(req), &req); |
4567 | } else { | |
c9b66675 | 4568 | __clear_chan_timer(chan); |
f3f668b0 | 4569 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4570 | } |
89bc500e | 4571 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4572 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4573 | __u16 res, stat; |
1da177e4 | 4574 | |
b1235d79 | 4575 | if (!status) { |
df3c3931 JH |
4576 | if (bt_sk(sk)->defer_setup) { |
4577 | struct sock *parent = bt_sk(sk)->parent; | |
4578 | res = L2CAP_CR_PEND; | |
4579 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4580 | if (parent) |
4581 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4582 | } else { |
05558911 | 4583 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4584 | res = L2CAP_CR_SUCCESS; |
4585 | stat = L2CAP_CS_NO_INFO; | |
4586 | } | |
b1235d79 | 4587 | } else { |
89bc500e | 4588 | l2cap_state_change(chan, BT_DISCONN); |
f3f668b0 | 4589 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4590 | res = L2CAP_CR_SEC_BLOCK; |
4591 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4592 | } |
4593 | ||
fe4128e0 GP |
4594 | rsp.scid = cpu_to_le16(chan->dcid); |
4595 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4596 | rsp.result = cpu_to_le16(res); |
4597 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4598 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4599 | sizeof(rsp), &rsp); | |
b1235d79 | 4600 | } |
1da177e4 LT |
4601 | |
4602 | bh_unlock_sock(sk); | |
4603 | } | |
4604 | ||
3d57dc68 | 4605 | rcu_read_unlock(); |
b1235d79 | 4606 | |
1da177e4 LT |
4607 | return 0; |
4608 | } | |
4609 | ||
4610 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4611 | { | |
4612 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4613 | ||
5a08ecce AE |
4614 | if (!conn) |
4615 | conn = l2cap_conn_add(hcon, 0); | |
4616 | ||
4617 | if (!conn) | |
1da177e4 LT |
4618 | goto drop; |
4619 | ||
4620 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4621 | ||
e702112f | 4622 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4623 | struct l2cap_hdr *hdr; |
48454079 | 4624 | struct l2cap_chan *chan; |
89794813 | 4625 | u16 cid; |
1da177e4 LT |
4626 | int len; |
4627 | ||
4628 | if (conn->rx_len) { | |
4629 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4630 | kfree_skb(conn->rx_skb); | |
4631 | conn->rx_skb = NULL; | |
4632 | conn->rx_len = 0; | |
4633 | l2cap_conn_unreliable(conn, ECOMM); | |
4634 | } | |
4635 | ||
aae7fe22 AE |
4636 | /* Start fragment always begin with Basic L2CAP header */ |
4637 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4638 | BT_ERR("Frame is too short (len %d)", skb->len); |
4639 | l2cap_conn_unreliable(conn, ECOMM); | |
4640 | goto drop; | |
4641 | } | |
4642 | ||
4643 | hdr = (struct l2cap_hdr *) skb->data; | |
4644 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4645 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4646 | |
4647 | if (len == skb->len) { | |
4648 | /* Complete frame received */ | |
4649 | l2cap_recv_frame(conn, skb); | |
4650 | return 0; | |
4651 | } | |
4652 | ||
4653 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4654 | ||
4655 | if (skb->len > len) { | |
4656 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4657 | skb->len, len); | |
4658 | l2cap_conn_unreliable(conn, ECOMM); | |
4659 | goto drop; | |
4660 | } | |
4661 | ||
baa7e1fa | 4662 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4663 | |
48454079 GP |
4664 | if (chan && chan->sk) { |
4665 | struct sock *sk = chan->sk; | |
89794813 | 4666 | |
0c1bc5c6 | 4667 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4668 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4669 | "MTU %d)", len, | |
0c1bc5c6 | 4670 | chan->imtu); |
aa2ac881 | 4671 | release_sock(sk); |
48454079 GP |
4672 | l2cap_conn_unreliable(conn, ECOMM); |
4673 | goto drop; | |
4674 | } | |
aa2ac881 | 4675 | release_sock(sk); |
48454079 | 4676 | } |
89794813 | 4677 | |
1da177e4 | 4678 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4679 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4680 | if (!conn->rx_skb) | |
1da177e4 LT |
4681 | goto drop; |
4682 | ||
d626f62b | 4683 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4684 | skb->len); |
1da177e4 LT |
4685 | conn->rx_len = len - skb->len; |
4686 | } else { | |
4687 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4688 | ||
4689 | if (!conn->rx_len) { | |
4690 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4691 | l2cap_conn_unreliable(conn, ECOMM); | |
4692 | goto drop; | |
4693 | } | |
4694 | ||
4695 | if (skb->len > conn->rx_len) { | |
4696 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4697 | skb->len, conn->rx_len); | |
4698 | kfree_skb(conn->rx_skb); | |
4699 | conn->rx_skb = NULL; | |
4700 | conn->rx_len = 0; | |
4701 | l2cap_conn_unreliable(conn, ECOMM); | |
4702 | goto drop; | |
4703 | } | |
4704 | ||
d626f62b | 4705 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4706 | skb->len); |
1da177e4 LT |
4707 | conn->rx_len -= skb->len; |
4708 | ||
4709 | if (!conn->rx_len) { | |
4710 | /* Complete frame received */ | |
4711 | l2cap_recv_frame(conn, conn->rx_skb); | |
4712 | conn->rx_skb = NULL; | |
4713 | } | |
4714 | } | |
4715 | ||
4716 | drop: | |
4717 | kfree_skb(skb); | |
4718 | return 0; | |
4719 | } | |
4720 | ||
aef7d97c | 4721 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4722 | { |
23691d75 | 4723 | struct l2cap_chan *c; |
1da177e4 | 4724 | |
23691d75 | 4725 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4726 | |
23691d75 GP |
4727 | list_for_each_entry(c, &chan_list, global_l) { |
4728 | struct sock *sk = c->sk; | |
101545f6 | 4729 | |
903d343e | 4730 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4731 | batostr(&bt_sk(sk)->src), |
4732 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4733 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4734 | c->scid, c->dcid, c->imtu, c->omtu, |
4735 | c->sec_level, c->mode); | |
05558911 | 4736 | } |
1da177e4 | 4737 | |
23691d75 | 4738 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4739 | |
aef7d97c | 4740 | return 0; |
1da177e4 LT |
4741 | } |
4742 | ||
aef7d97c MH |
4743 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4744 | { | |
4745 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4746 | } | |
4747 | ||
4748 | static const struct file_operations l2cap_debugfs_fops = { | |
4749 | .open = l2cap_debugfs_open, | |
4750 | .read = seq_read, | |
4751 | .llseek = seq_lseek, | |
4752 | .release = single_release, | |
4753 | }; | |
4754 | ||
4755 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4756 | |
1da177e4 LT |
4757 | static struct hci_proto l2cap_hci_proto = { |
4758 | .name = "L2CAP", | |
4759 | .id = HCI_PROTO_L2CAP, | |
4760 | .connect_ind = l2cap_connect_ind, | |
4761 | .connect_cfm = l2cap_connect_cfm, | |
4762 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4763 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4764 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4765 | .recv_acldata = l2cap_recv_acldata |
4766 | }; | |
4767 | ||
64274518 | 4768 | int __init l2cap_init(void) |
1da177e4 LT |
4769 | { |
4770 | int err; | |
be9d1227 | 4771 | |
bb58f747 | 4772 | err = l2cap_init_sockets(); |
1da177e4 LT |
4773 | if (err < 0) |
4774 | return err; | |
4775 | ||
1da177e4 LT |
4776 | err = hci_register_proto(&l2cap_hci_proto); |
4777 | if (err < 0) { | |
4778 | BT_ERR("L2CAP protocol registration failed"); | |
4779 | bt_sock_unregister(BTPROTO_L2CAP); | |
4780 | goto error; | |
4781 | } | |
4782 | ||
aef7d97c MH |
4783 | if (bt_debugfs) { |
4784 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4785 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4786 | if (!l2cap_debugfs) | |
4787 | BT_ERR("Failed to create L2CAP debug file"); | |
4788 | } | |
1da177e4 | 4789 | |
1da177e4 LT |
4790 | return 0; |
4791 | ||
4792 | error: | |
bb58f747 | 4793 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4794 | return err; |
4795 | } | |
4796 | ||
64274518 | 4797 | void l2cap_exit(void) |
1da177e4 | 4798 | { |
aef7d97c | 4799 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4800 | |
1da177e4 LT |
4801 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4802 | BT_ERR("L2CAP protocol unregistration failed"); | |
4803 | ||
bb58f747 | 4804 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4805 | } |
4806 | ||
d1c4a17d GP |
4807 | module_param(disable_ertm, bool, 0644); |
4808 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |