Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 57 | #include <net/bluetooth/smp.h> |
1da177e4 | 58 | |
bb58f747 | 59 | int disable_ertm; |
f0709e03 | 60 | |
47ec1dcd | 61 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 62 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 63 | |
b5ad8b7f JB |
64 | static LIST_HEAD(chan_list); |
65 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 66 | |
1da177e4 LT |
67 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
68 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
69 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
70 | void *data); | |
710f9b0a | 71 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
72 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
73 | struct l2cap_chan *chan, int err); | |
1da177e4 | 74 | |
218bb9df GP |
75 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
76 | ||
0139418c | 77 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
78 | |
79 | static inline void chan_hold(struct l2cap_chan *c) | |
80 | { | |
81 | atomic_inc(&c->refcnt); | |
82 | } | |
83 | ||
84 | static inline void chan_put(struct l2cap_chan *c) | |
85 | { | |
86 | if (atomic_dec_and_test(&c->refcnt)) | |
87 | kfree(c); | |
88 | } | |
89 | ||
baa7e1fa | 90 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 91 | { |
3d57dc68 | 92 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 93 | |
3d57dc68 GP |
94 | rcu_read_lock(); |
95 | ||
96 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
97 | if (c->dcid == cid) { | |
98 | r = c; | |
99 | break; | |
100 | } | |
0139418c | 101 | } |
3d57dc68 GP |
102 | |
103 | rcu_read_unlock(); | |
104 | return r; | |
0139418c MH |
105 | } |
106 | ||
baa7e1fa | 107 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 108 | { |
3d57dc68 | 109 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 110 | |
3d57dc68 GP |
111 | rcu_read_lock(); |
112 | ||
113 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
114 | if (c->scid == cid) { | |
115 | r = c; | |
116 | break; | |
117 | } | |
0139418c | 118 | } |
3d57dc68 GP |
119 | |
120 | rcu_read_unlock(); | |
121 | return r; | |
0139418c MH |
122 | } |
123 | ||
124 | /* Find channel with given SCID. | |
125 | * Returns locked socket */ | |
baa7e1fa | 126 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 127 | { |
48454079 | 128 | struct l2cap_chan *c; |
baa7e1fa | 129 | |
baa7e1fa | 130 | c = __l2cap_get_chan_by_scid(conn, cid); |
48454079 | 131 | if (c) |
aa2ac881 | 132 | lock_sock(c->sk); |
48454079 | 133 | return c; |
0139418c MH |
134 | } |
135 | ||
baa7e1fa | 136 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 137 | { |
3d57dc68 | 138 | struct l2cap_chan *c, *r = NULL; |
baa7e1fa | 139 | |
3d57dc68 GP |
140 | rcu_read_lock(); |
141 | ||
142 | list_for_each_entry_rcu(c, &conn->chan_l, list) { | |
143 | if (c->ident == ident) { | |
144 | r = c; | |
145 | break; | |
146 | } | |
0139418c | 147 | } |
3d57dc68 GP |
148 | |
149 | rcu_read_unlock(); | |
150 | return r; | |
0139418c MH |
151 | } |
152 | ||
baa7e1fa | 153 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 154 | { |
48454079 | 155 | struct l2cap_chan *c; |
baa7e1fa | 156 | |
baa7e1fa | 157 | c = __l2cap_get_chan_by_ident(conn, ident); |
48454079 | 158 | if (c) |
aa2ac881 | 159 | lock_sock(c->sk); |
48454079 | 160 | return c; |
0139418c MH |
161 | } |
162 | ||
23691d75 | 163 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 164 | { |
23691d75 | 165 | struct l2cap_chan *c; |
9e4425ff | 166 | |
23691d75 GP |
167 | list_for_each_entry(c, &chan_list, global_l) { |
168 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 169 | return c; |
9e4425ff | 170 | } |
250938cb | 171 | return NULL; |
9e4425ff GP |
172 | } |
173 | ||
174 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
175 | { | |
73b2ec18 GP |
176 | int err; |
177 | ||
23691d75 | 178 | write_lock_bh(&chan_list_lock); |
9e4425ff | 179 | |
23691d75 | 180 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
181 | err = -EADDRINUSE; |
182 | goto done; | |
9e4425ff GP |
183 | } |
184 | ||
73b2ec18 GP |
185 | if (psm) { |
186 | chan->psm = psm; | |
187 | chan->sport = psm; | |
188 | err = 0; | |
189 | } else { | |
190 | u16 p; | |
191 | ||
192 | err = -EINVAL; | |
193 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 194 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
195 | chan->psm = cpu_to_le16(p); |
196 | chan->sport = cpu_to_le16(p); | |
197 | err = 0; | |
198 | break; | |
199 | } | |
200 | } | |
9e4425ff | 201 | |
73b2ec18 | 202 | done: |
23691d75 | 203 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 204 | return err; |
9e4425ff GP |
205 | } |
206 | ||
207 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
208 | { | |
23691d75 | 209 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
210 | |
211 | chan->scid = scid; | |
212 | ||
23691d75 | 213 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
baa7e1fa | 218 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 219 | { |
8db4dc46 | 220 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 221 | |
8db4dc46 | 222 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 223 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
224 | return cid; |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
721c4181 | 230 | static void l2cap_set_timer(struct l2cap_chan *chan, struct delayed_work *work, long timeout) |
ab07801d | 231 | { |
457f4850 | 232 | BT_DBG("chan %p state %d timeout %ld", chan, chan->state, timeout); |
89bc500e | 233 | |
721c4181 GP |
234 | cancel_delayed_work_sync(work); |
235 | ||
236 | schedule_delayed_work(work, timeout); | |
ab07801d GP |
237 | } |
238 | ||
721c4181 | 239 | static void l2cap_clear_timer(struct delayed_work *work) |
ab07801d | 240 | { |
721c4181 | 241 | cancel_delayed_work_sync(work); |
ab07801d GP |
242 | } |
243 | ||
badaaa00 GP |
244 | static char *state_to_string(int state) |
245 | { | |
246 | switch(state) { | |
247 | case BT_CONNECTED: | |
248 | return "BT_CONNECTED"; | |
249 | case BT_OPEN: | |
250 | return "BT_OPEN"; | |
251 | case BT_BOUND: | |
252 | return "BT_BOUND"; | |
253 | case BT_LISTEN: | |
254 | return "BT_LISTEN"; | |
255 | case BT_CONNECT: | |
256 | return "BT_CONNECT"; | |
257 | case BT_CONNECT2: | |
258 | return "BT_CONNECT2"; | |
259 | case BT_CONFIG: | |
260 | return "BT_CONFIG"; | |
261 | case BT_DISCONN: | |
262 | return "BT_DISCONN"; | |
263 | case BT_CLOSED: | |
264 | return "BT_CLOSED"; | |
265 | } | |
266 | ||
267 | return "invalid state"; | |
268 | } | |
269 | ||
89bc500e GP |
270 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
271 | { | |
badaaa00 GP |
272 | BT_DBG("%p %s -> %s", chan, state_to_string(chan->state), |
273 | state_to_string(state)); | |
274 | ||
89bc500e GP |
275 | chan->state = state; |
276 | chan->ops->state_change(chan->data, state); | |
277 | } | |
278 | ||
721c4181 | 279 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 280 | { |
721c4181 GP |
281 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
282 | chan_timer.work); | |
ab07801d GP |
283 | struct sock *sk = chan->sk; |
284 | int reason; | |
285 | ||
89bc500e | 286 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 287 | |
721c4181 | 288 | lock_sock(sk); |
ab07801d | 289 | |
89bc500e | 290 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 291 | reason = ECONNREFUSED; |
89bc500e | 292 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
293 | chan->sec_level != BT_SECURITY_SDP) |
294 | reason = ECONNREFUSED; | |
295 | else | |
296 | reason = ETIMEDOUT; | |
297 | ||
0f852724 | 298 | l2cap_chan_close(chan, reason); |
ab07801d | 299 | |
721c4181 | 300 | release_sock(sk); |
ab07801d | 301 | |
ba3bd0ee | 302 | chan->ops->close(chan->data); |
71ba0e56 | 303 | chan_put(chan); |
ab07801d GP |
304 | } |
305 | ||
23691d75 | 306 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
307 | { |
308 | struct l2cap_chan *chan; | |
309 | ||
310 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
311 | if (!chan) | |
312 | return NULL; | |
313 | ||
314 | chan->sk = sk; | |
315 | ||
23691d75 GP |
316 | write_lock_bh(&chan_list_lock); |
317 | list_add(&chan->global_l, &chan_list); | |
318 | write_unlock_bh(&chan_list_lock); | |
319 | ||
721c4181 | 320 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 321 | |
89bc500e GP |
322 | chan->state = BT_OPEN; |
323 | ||
71ba0e56 GP |
324 | atomic_set(&chan->refcnt, 1); |
325 | ||
abc545b8 SJ |
326 | BT_DBG("sk %p chan %p", sk, chan); |
327 | ||
48454079 GP |
328 | return chan; |
329 | } | |
330 | ||
23691d75 | 331 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 332 | { |
23691d75 GP |
333 | write_lock_bh(&chan_list_lock); |
334 | list_del(&chan->global_l); | |
335 | write_unlock_bh(&chan_list_lock); | |
336 | ||
71ba0e56 | 337 | chan_put(chan); |
6ff5abbf GP |
338 | } |
339 | ||
3d57dc68 | 340 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 341 | { |
af05b30b | 342 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 343 | chan->psm, chan->dcid); |
0139418c | 344 | |
9f5a0d7b | 345 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 346 | |
8c1d787b | 347 | chan->conn = conn; |
0139418c | 348 | |
715ec005 | 349 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
350 | if (conn->hcon->type == LE_LINK) { |
351 | /* LE connection */ | |
0c1bc5c6 | 352 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
353 | chan->scid = L2CAP_CID_LE_DATA; |
354 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
355 | } else { |
356 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 357 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 358 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 359 | } |
715ec005 | 360 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 361 | /* Connectionless socket */ |
fe4128e0 GP |
362 | chan->scid = L2CAP_CID_CONN_LESS; |
363 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 364 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
365 | } else { |
366 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
367 | chan->scid = L2CAP_CID_SIGNALING; |
368 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 369 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
370 | } |
371 | ||
8f7975b1 AE |
372 | chan->local_id = L2CAP_BESTEFFORT_ID; |
373 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
374 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
375 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
376 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
377 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
378 | ||
71ba0e56 | 379 | chan_hold(chan); |
baa7e1fa | 380 | |
3d57dc68 | 381 | list_add_rcu(&chan->list, &conn->chan_l); |
0139418c MH |
382 | } |
383 | ||
8e87d142 | 384 | /* Delete channel. |
0139418c | 385 | * Must be called on the locked socket. */ |
4519de9a | 386 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 387 | { |
48454079 | 388 | struct sock *sk = chan->sk; |
8c1d787b | 389 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
390 | struct sock *parent = bt_sk(sk)->parent; |
391 | ||
c9b66675 | 392 | __clear_chan_timer(chan); |
0139418c | 393 | |
49208c9c | 394 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 395 | |
8e87d142 | 396 | if (conn) { |
baa7e1fa | 397 | /* Delete from channel list */ |
3d57dc68 GP |
398 | list_del_rcu(&chan->list); |
399 | synchronize_rcu(); | |
400 | ||
71ba0e56 | 401 | chan_put(chan); |
baa7e1fa | 402 | |
8c1d787b | 403 | chan->conn = NULL; |
0139418c MH |
404 | hci_conn_put(conn->hcon); |
405 | } | |
406 | ||
89bc500e | 407 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
408 | sock_set_flag(sk, SOCK_ZAPPED); |
409 | ||
410 | if (err) | |
411 | sk->sk_err = err; | |
412 | ||
413 | if (parent) { | |
414 | bt_accept_unlink(sk); | |
415 | parent->sk_data_ready(parent, 0); | |
416 | } else | |
417 | sk->sk_state_change(sk); | |
c13ffa62 | 418 | |
c1360a1c GP |
419 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
420 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 421 | return; |
2ead70b8 | 422 | |
58d35f87 | 423 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 424 | |
0c1bc5c6 | 425 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
426 | struct srej_list *l, *tmp; |
427 | ||
1a09bcb9 GP |
428 | __clear_retrans_timer(chan); |
429 | __clear_monitor_timer(chan); | |
430 | __clear_ack_timer(chan); | |
c13ffa62 | 431 | |
f1c6775b | 432 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 433 | |
39d5a3ee | 434 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
435 | list_del(&l->list); |
436 | kfree(l); | |
437 | } | |
438 | } | |
0139418c MH |
439 | } |
440 | ||
4519de9a GP |
441 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
442 | { | |
443 | struct sock *sk; | |
444 | ||
445 | BT_DBG("parent %p", parent); | |
446 | ||
447 | /* Close not yet accepted channels */ | |
0f852724 | 448 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 449 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 450 | __clear_chan_timer(chan); |
0f852724 | 451 | lock_sock(sk); |
ba3bd0ee | 452 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 453 | release_sock(sk); |
ba3bd0ee | 454 | chan->ops->close(chan->data); |
0f852724 | 455 | } |
4519de9a GP |
456 | } |
457 | ||
0f852724 | 458 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
459 | { |
460 | struct l2cap_conn *conn = chan->conn; | |
461 | struct sock *sk = chan->sk; | |
462 | ||
89bc500e | 463 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 464 | |
89bc500e | 465 | switch (chan->state) { |
4519de9a GP |
466 | case BT_LISTEN: |
467 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
468 | |
469 | l2cap_state_change(chan, BT_CLOSED); | |
470 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
471 | break; |
472 | ||
473 | case BT_CONNECTED: | |
474 | case BT_CONFIG: | |
715ec005 | 475 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 476 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
477 | __clear_chan_timer(chan); |
478 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
479 | l2cap_send_disconn_req(conn, chan, reason); |
480 | } else | |
481 | l2cap_chan_del(chan, reason); | |
482 | break; | |
483 | ||
484 | case BT_CONNECT2: | |
715ec005 | 485 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
486 | conn->hcon->type == ACL_LINK) { |
487 | struct l2cap_conn_rsp rsp; | |
488 | __u16 result; | |
489 | ||
490 | if (bt_sk(sk)->defer_setup) | |
491 | result = L2CAP_CR_SEC_BLOCK; | |
492 | else | |
493 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 494 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
495 | |
496 | rsp.scid = cpu_to_le16(chan->dcid); | |
497 | rsp.dcid = cpu_to_le16(chan->scid); | |
498 | rsp.result = cpu_to_le16(result); | |
499 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
500 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
501 | sizeof(rsp), &rsp); | |
502 | } | |
503 | ||
504 | l2cap_chan_del(chan, reason); | |
505 | break; | |
506 | ||
507 | case BT_CONNECT: | |
508 | case BT_DISCONN: | |
509 | l2cap_chan_del(chan, reason); | |
510 | break; | |
511 | ||
512 | default: | |
513 | sock_set_flag(sk, SOCK_ZAPPED); | |
514 | break; | |
515 | } | |
516 | } | |
517 | ||
4343478f | 518 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 519 | { |
715ec005 | 520 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 521 | switch (chan->sec_level) { |
8556edd3 JH |
522 | case BT_SECURITY_HIGH: |
523 | return HCI_AT_DEDICATED_BONDING_MITM; | |
524 | case BT_SECURITY_MEDIUM: | |
525 | return HCI_AT_DEDICATED_BONDING; | |
526 | default: | |
527 | return HCI_AT_NO_BONDING; | |
528 | } | |
fe4128e0 | 529 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
530 | if (chan->sec_level == BT_SECURITY_LOW) |
531 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 532 | |
4343478f | 533 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 534 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 535 | else |
8556edd3 | 536 | return HCI_AT_NO_BONDING; |
00ae4af9 | 537 | } else { |
4343478f | 538 | switch (chan->sec_level) { |
00ae4af9 | 539 | case BT_SECURITY_HIGH: |
8556edd3 | 540 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 541 | case BT_SECURITY_MEDIUM: |
8556edd3 | 542 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 543 | default: |
8556edd3 | 544 | return HCI_AT_NO_BONDING; |
00ae4af9 | 545 | } |
0684e5f9 | 546 | } |
8556edd3 JH |
547 | } |
548 | ||
549 | /* Service level security */ | |
d45fc423 | 550 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 551 | { |
8c1d787b | 552 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
553 | __u8 auth_type; |
554 | ||
4343478f | 555 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 556 | |
4343478f | 557 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
558 | } |
559 | ||
b5ad8b7f | 560 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
561 | { |
562 | u8 id; | |
563 | ||
564 | /* Get next available identificator. | |
565 | * 1 - 128 are used by kernel. | |
566 | * 129 - 199 are reserved. | |
567 | * 200 - 254 are used by utilities like l2ping, etc. | |
568 | */ | |
569 | ||
570 | spin_lock_bh(&conn->lock); | |
571 | ||
572 | if (++conn->tx_ident > 128) | |
573 | conn->tx_ident = 1; | |
574 | ||
575 | id = conn->tx_ident; | |
576 | ||
577 | spin_unlock_bh(&conn->lock); | |
578 | ||
579 | return id; | |
580 | } | |
581 | ||
4519de9a | 582 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
583 | { |
584 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 585 | u8 flags; |
4e8402a3 MH |
586 | |
587 | BT_DBG("code 0x%2.2x", code); | |
588 | ||
589 | if (!skb) | |
9a9c6a34 | 590 | return; |
4e8402a3 | 591 | |
e702112f AE |
592 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
593 | flags = ACL_START_NO_FLUSH; | |
594 | else | |
595 | flags = ACL_START; | |
596 | ||
14b12d0b | 597 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 598 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 599 | |
73d80deb LAD |
600 | hci_send_acl(conn->hchan, skb, flags); |
601 | } | |
602 | ||
603 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
604 | { | |
605 | struct hci_conn *hcon = chan->conn->hcon; | |
606 | u16 flags; | |
607 | ||
608 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
609 | skb->priority); | |
610 | ||
611 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
612 | lmp_no_flush_capable(hcon->hdev)) | |
613 | flags = ACL_START_NO_FLUSH; | |
614 | else | |
615 | flags = ACL_START; | |
14b12d0b | 616 | |
73d80deb LAD |
617 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
618 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
619 | } |
620 | ||
88843ab0 | 621 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
1c2acffb GP |
622 | { |
623 | struct sk_buff *skb; | |
624 | struct l2cap_hdr *lh; | |
8c1d787b | 625 | struct l2cap_conn *conn = chan->conn; |
e4ca6d98 | 626 | int count, hlen; |
fcc203c3 | 627 | |
89bc500e | 628 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
629 | return; |
630 | ||
e4ca6d98 AE |
631 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
632 | hlen = L2CAP_EXT_HDR_SIZE; | |
633 | else | |
634 | hlen = L2CAP_ENH_HDR_SIZE; | |
635 | ||
47d1ec61 | 636 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 637 | hlen += L2CAP_FCS_SIZE; |
1c2acffb | 638 | |
88843ab0 | 639 | BT_DBG("chan %p, control 0x%8.8x", chan, control); |
1c2acffb | 640 | |
fcc203c3 | 641 | count = min_t(unsigned int, conn->mtu, hlen); |
793c2f1c AE |
642 | |
643 | control |= __set_sframe(chan); | |
1c2acffb | 644 | |
e2ab4353 | 645 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 646 | control |= __set_ctrl_final(chan); |
9e917af1 | 647 | |
e2ab4353 | 648 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
e3781735 | 649 | control |= __set_ctrl_poll(chan); |
f0946ccf | 650 | |
1c2acffb GP |
651 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
652 | if (!skb) | |
9a9c6a34 | 653 | return; |
1c2acffb GP |
654 | |
655 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 656 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 657 | lh->cid = cpu_to_le16(chan->dcid); |
88843ab0 AE |
658 | |
659 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1c2acffb | 660 | |
47d1ec61 | 661 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
662 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); |
663 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
664 | } |
665 | ||
73d80deb LAD |
666 | skb->priority = HCI_PRIO_MAX; |
667 | l2cap_do_send(chan, skb); | |
1c2acffb GP |
668 | } |
669 | ||
88843ab0 | 670 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) |
7e743090 | 671 | { |
e2ab4353 | 672 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 673 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 674 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 675 | } else |
ab784b73 | 676 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 677 | |
0b209fae | 678 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 679 | |
525cd185 | 680 | l2cap_send_sframe(chan, control); |
7e743090 GP |
681 | } |
682 | ||
b4450035 | 683 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 684 | { |
c1360a1c | 685 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
686 | } |
687 | ||
fc7f8a7e | 688 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 689 | { |
8c1d787b | 690 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
691 | |
692 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
693 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
694 | return; | |
695 | ||
d45fc423 | 696 | if (l2cap_chan_check_security(chan) && |
4343478f | 697 | __l2cap_no_conn_pending(chan)) { |
b1235d79 | 698 | struct l2cap_conn_req req; |
fe4128e0 GP |
699 | req.scid = cpu_to_le16(chan->scid); |
700 | req.psm = chan->psm; | |
79d554a6 | 701 | |
fc7f8a7e | 702 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 703 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 704 | |
fc7f8a7e GP |
705 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
706 | sizeof(req), &req); | |
b1235d79 | 707 | } |
79d554a6 MH |
708 | } else { |
709 | struct l2cap_info_req req; | |
710 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
711 | ||
712 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
713 | conn->info_ident = l2cap_get_ident(conn); | |
714 | ||
f878fcad | 715 | schedule_delayed_work(&conn->info_work, |
79d554a6 MH |
716 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
717 | ||
718 | l2cap_send_cmd(conn, conn->info_ident, | |
719 | L2CAP_INFO_REQ, sizeof(req), &req); | |
720 | } | |
721 | } | |
722 | ||
cf6c2c0b GP |
723 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
724 | { | |
725 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 726 | if (!disable_ertm) |
cf6c2c0b GP |
727 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
728 | ||
729 | switch (mode) { | |
730 | case L2CAP_MODE_ERTM: | |
731 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
732 | case L2CAP_MODE_STREAMING: | |
733 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
734 | default: | |
735 | return 0x00; | |
736 | } | |
737 | } | |
738 | ||
4519de9a | 739 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 740 | { |
e92c8e70 | 741 | struct sock *sk; |
22121fc9 GP |
742 | struct l2cap_disconn_req req; |
743 | ||
c13ffa62 GP |
744 | if (!conn) |
745 | return; | |
746 | ||
e92c8e70 GP |
747 | sk = chan->sk; |
748 | ||
0c1bc5c6 | 749 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
750 | __clear_retrans_timer(chan); |
751 | __clear_monitor_timer(chan); | |
752 | __clear_ack_timer(chan); | |
c13ffa62 GP |
753 | } |
754 | ||
fe4128e0 GP |
755 | req.dcid = cpu_to_le16(chan->dcid); |
756 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
757 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
758 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 759 | |
89bc500e | 760 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 761 | sk->sk_err = err; |
22121fc9 GP |
762 | } |
763 | ||
1da177e4 | 764 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
765 | static void l2cap_conn_start(struct l2cap_conn *conn) |
766 | { | |
3d57dc68 | 767 | struct l2cap_chan *chan; |
4e8402a3 MH |
768 | |
769 | BT_DBG("conn %p", conn); | |
770 | ||
3d57dc68 | 771 | rcu_read_lock(); |
4e8402a3 | 772 | |
3d57dc68 | 773 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 774 | struct sock *sk = chan->sk; |
baa7e1fa | 775 | |
4e8402a3 MH |
776 | bh_lock_sock(sk); |
777 | ||
715ec005 | 778 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
779 | bh_unlock_sock(sk); |
780 | continue; | |
781 | } | |
782 | ||
89bc500e | 783 | if (chan->state == BT_CONNECT) { |
47731de7 | 784 | struct l2cap_conn_req req; |
79d554a6 | 785 | |
d45fc423 | 786 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 787 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
788 | bh_unlock_sock(sk); |
789 | continue; | |
790 | } | |
79d554a6 | 791 | |
c1360a1c GP |
792 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
793 | && test_bit(CONF_STATE2_DEVICE, | |
794 | &chan->conf_state)) { | |
0f852724 | 795 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 796 | * so release the lock */ |
89bc500e | 797 | l2cap_chan_close(chan, ECONNRESET); |
47731de7 GP |
798 | bh_unlock_sock(sk); |
799 | continue; | |
b1235d79 | 800 | } |
47731de7 | 801 | |
fe4128e0 GP |
802 | req.scid = cpu_to_le16(chan->scid); |
803 | req.psm = chan->psm; | |
47731de7 | 804 | |
fc7f8a7e | 805 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 806 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 807 | |
fc7f8a7e GP |
808 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
809 | sizeof(req), &req); | |
47731de7 | 810 | |
89bc500e | 811 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 812 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 813 | char buf[128]; |
fe4128e0 GP |
814 | rsp.scid = cpu_to_le16(chan->dcid); |
815 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 816 | |
d45fc423 | 817 | if (l2cap_chan_check_security(chan)) { |
f66dc81f MH |
818 | if (bt_sk(sk)->defer_setup) { |
819 | struct sock *parent = bt_sk(sk)->parent; | |
820 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
821 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
822 | if (parent) |
823 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
824 | |
825 | } else { | |
89bc500e | 826 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
827 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
828 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
829 | } | |
79d554a6 MH |
830 | } else { |
831 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
832 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
833 | } | |
834 | ||
fc7f8a7e GP |
835 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
836 | sizeof(rsp), &rsp); | |
e9aeb2dd | 837 | |
c1360a1c | 838 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
839 | rsp.result != L2CAP_CR_SUCCESS) { |
840 | bh_unlock_sock(sk); | |
841 | continue; | |
842 | } | |
843 | ||
c1360a1c | 844 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 845 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
846 | l2cap_build_conf_req(chan, buf), buf); |
847 | chan->num_conf_req++; | |
4e8402a3 MH |
848 | } |
849 | ||
850 | bh_unlock_sock(sk); | |
851 | } | |
852 | ||
3d57dc68 | 853 | rcu_read_unlock(); |
4e8402a3 MH |
854 | } |
855 | ||
b62f328b VT |
856 | /* Find socket with cid and source bdaddr. |
857 | * Returns closest match, locked. | |
858 | */ | |
23691d75 | 859 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 860 | { |
23691d75 | 861 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 862 | |
23691d75 | 863 | read_lock(&chan_list_lock); |
b62f328b | 864 | |
23691d75 GP |
865 | list_for_each_entry(c, &chan_list, global_l) { |
866 | struct sock *sk = c->sk; | |
fe4128e0 | 867 | |
89bc500e | 868 | if (state && c->state != state) |
b62f328b VT |
869 | continue; |
870 | ||
23691d75 | 871 | if (c->scid == cid) { |
b62f328b | 872 | /* Exact match. */ |
23691d75 GP |
873 | if (!bacmp(&bt_sk(sk)->src, src)) { |
874 | read_unlock(&chan_list_lock); | |
875 | return c; | |
876 | } | |
b62f328b VT |
877 | |
878 | /* Closest match */ | |
879 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 880 | c1 = c; |
b62f328b VT |
881 | } |
882 | } | |
280f294f | 883 | |
23691d75 | 884 | read_unlock(&chan_list_lock); |
b62f328b | 885 | |
23691d75 | 886 | return c1; |
b62f328b VT |
887 | } |
888 | ||
889 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
890 | { | |
c916fbe4 | 891 | struct sock *parent, *sk; |
23691d75 | 892 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
893 | |
894 | BT_DBG(""); | |
895 | ||
896 | /* Check if we have socket listening on cid */ | |
23691d75 | 897 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 898 | conn->src); |
23691d75 | 899 | if (!pchan) |
b62f328b VT |
900 | return; |
901 | ||
23691d75 GP |
902 | parent = pchan->sk; |
903 | ||
aa2ac881 | 904 | lock_sock(parent); |
62f3a2cf | 905 | |
b62f328b VT |
906 | /* Check for backlog size */ |
907 | if (sk_acceptq_is_full(parent)) { | |
908 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
909 | goto clean; | |
910 | } | |
911 | ||
80808e43 GP |
912 | chan = pchan->ops->new_connection(pchan->data); |
913 | if (!chan) | |
b62f328b VT |
914 | goto clean; |
915 | ||
80808e43 | 916 | sk = chan->sk; |
5d41ce1d | 917 | |
b62f328b VT |
918 | hci_conn_hold(conn->hcon); |
919 | ||
b62f328b VT |
920 | bacpy(&bt_sk(sk)->src, conn->src); |
921 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
922 | ||
d1010240 GP |
923 | bt_accept_enqueue(parent, sk); |
924 | ||
3d57dc68 | 925 | l2cap_chan_add(conn, chan); |
48454079 | 926 | |
c9b66675 | 927 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 928 | |
89bc500e | 929 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
930 | parent->sk_data_ready(parent, 0); |
931 | ||
b62f328b | 932 | clean: |
aa2ac881 | 933 | release_sock(parent); |
b62f328b VT |
934 | } |
935 | ||
f1cb9af5 VCG |
936 | static void l2cap_chan_ready(struct sock *sk) |
937 | { | |
938 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
939 | struct sock *parent = bt_sk(sk)->parent; | |
940 | ||
941 | BT_DBG("sk %p, parent %p", sk, parent); | |
942 | ||
943 | chan->conf_state = 0; | |
944 | __clear_chan_timer(chan); | |
945 | ||
43f3dc41 | 946 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
947 | sk->sk_state_change(sk); |
948 | ||
949 | if (parent) | |
950 | parent->sk_data_ready(parent, 0); | |
951 | } | |
952 | ||
4e8402a3 MH |
953 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
954 | { | |
48454079 | 955 | struct l2cap_chan *chan; |
4e8402a3 | 956 | |
79d554a6 | 957 | BT_DBG("conn %p", conn); |
4e8402a3 | 958 | |
b62f328b VT |
959 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
960 | l2cap_le_conn_ready(conn); | |
961 | ||
160dc6ac VCG |
962 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
963 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
964 | ||
3d57dc68 | 965 | rcu_read_lock(); |
4e8402a3 | 966 | |
3d57dc68 | 967 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 968 | struct sock *sk = chan->sk; |
baa7e1fa | 969 | |
79d554a6 | 970 | bh_lock_sock(sk); |
4e8402a3 | 971 | |
63128451 | 972 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 973 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 974 | l2cap_chan_ready(sk); |
acd7d370 | 975 | |
63128451 | 976 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 977 | __clear_chan_timer(chan); |
89bc500e | 978 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 979 | sk->sk_state_change(sk); |
b501d6a1 | 980 | |
89bc500e | 981 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 982 | l2cap_do_start(chan); |
4e8402a3 | 983 | |
79d554a6 | 984 | bh_unlock_sock(sk); |
4e8402a3 | 985 | } |
79d554a6 | 986 | |
3d57dc68 | 987 | rcu_read_unlock(); |
4e8402a3 MH |
988 | } |
989 | ||
990 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
991 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
992 | { | |
48454079 | 993 | struct l2cap_chan *chan; |
4e8402a3 MH |
994 | |
995 | BT_DBG("conn %p", conn); | |
996 | ||
3d57dc68 | 997 | rcu_read_lock(); |
4e8402a3 | 998 | |
3d57dc68 | 999 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 1000 | struct sock *sk = chan->sk; |
baa7e1fa | 1001 | |
ecf61bdb | 1002 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
4e8402a3 MH |
1003 | sk->sk_err = err; |
1004 | } | |
1005 | ||
3d57dc68 | 1006 | rcu_read_unlock(); |
4e8402a3 MH |
1007 | } |
1008 | ||
f878fcad | 1009 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1010 | { |
f878fcad GP |
1011 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1012 | info_work.work); | |
4e8402a3 | 1013 | |
984947dc | 1014 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1015 | conn->info_ident = 0; |
984947dc | 1016 | |
4e8402a3 MH |
1017 | l2cap_conn_start(conn); |
1018 | } | |
1019 | ||
5d3de7df VCG |
1020 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1021 | { | |
1022 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1023 | struct l2cap_chan *chan, *l; | |
1024 | struct sock *sk; | |
1025 | ||
1026 | if (!conn) | |
1027 | return; | |
1028 | ||
1029 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1030 | ||
1031 | kfree_skb(conn->rx_skb); | |
1032 | ||
1033 | /* Kill channels */ | |
1034 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
1035 | sk = chan->sk; | |
aa2ac881 | 1036 | lock_sock(sk); |
5d3de7df | 1037 | l2cap_chan_del(chan, err); |
aa2ac881 | 1038 | release_sock(sk); |
5d3de7df VCG |
1039 | chan->ops->close(chan->data); |
1040 | } | |
1041 | ||
73d80deb LAD |
1042 | hci_chan_del(conn->hchan); |
1043 | ||
5d3de7df | 1044 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
f878fcad | 1045 | cancel_delayed_work_sync(&conn->info_work); |
5d3de7df | 1046 | |
d26a2345 | 1047 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
5d3de7df | 1048 | del_timer(&conn->security_timer); |
8aab4757 | 1049 | smp_chan_destroy(conn); |
d26a2345 | 1050 | } |
5d3de7df VCG |
1051 | |
1052 | hcon->l2cap_data = NULL; | |
1053 | kfree(conn); | |
1054 | } | |
1055 | ||
1056 | static void security_timeout(unsigned long arg) | |
1057 | { | |
1058 | struct l2cap_conn *conn = (void *) arg; | |
1059 | ||
1060 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1064 | { | |
0139418c | 1065 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1066 | struct hci_chan *hchan; |
1da177e4 | 1067 | |
0139418c | 1068 | if (conn || status) |
1da177e4 LT |
1069 | return conn; |
1070 | ||
73d80deb LAD |
1071 | hchan = hci_chan_create(hcon); |
1072 | if (!hchan) | |
1073 | return NULL; | |
1074 | ||
0139418c | 1075 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1076 | if (!conn) { |
1077 | hci_chan_del(hchan); | |
1da177e4 | 1078 | return NULL; |
73d80deb | 1079 | } |
1da177e4 LT |
1080 | |
1081 | hcon->l2cap_data = conn; | |
1082 | conn->hcon = hcon; | |
73d80deb | 1083 | conn->hchan = hchan; |
1da177e4 | 1084 | |
73d80deb | 1085 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1086 | |
acd7d370 VT |
1087 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1088 | conn->mtu = hcon->hdev->le_mtu; | |
1089 | else | |
1090 | conn->mtu = hcon->hdev->acl_mtu; | |
1091 | ||
1da177e4 LT |
1092 | conn->src = &hcon->hdev->bdaddr; |
1093 | conn->dst = &hcon->dst; | |
1094 | ||
4e8402a3 MH |
1095 | conn->feat_mask = 0; |
1096 | ||
1da177e4 | 1097 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1098 | |
1099 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1100 | |
5d3de7df VCG |
1101 | if (hcon->type == LE_LINK) |
1102 | setup_timer(&conn->security_timer, security_timeout, | |
1103 | (unsigned long) conn); | |
1104 | else | |
f878fcad | 1105 | INIT_DELAYED_WORK(&conn->info_work, l2cap_info_timeout); |
45054dc1 | 1106 | |
9f5a0d7b | 1107 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1108 | |
1da177e4 LT |
1109 | return conn; |
1110 | } | |
1111 | ||
1da177e4 | 1112 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1113 | |
1114 | /* Find socket with psm and source bdaddr. | |
1115 | * Returns closest match. | |
1116 | */ | |
23691d75 | 1117 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1118 | { |
23691d75 | 1119 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1120 | |
23691d75 | 1121 | read_lock(&chan_list_lock); |
e0f0cb56 | 1122 | |
23691d75 GP |
1123 | list_for_each_entry(c, &chan_list, global_l) { |
1124 | struct sock *sk = c->sk; | |
fe4128e0 | 1125 | |
89bc500e | 1126 | if (state && c->state != state) |
1da177e4 LT |
1127 | continue; |
1128 | ||
23691d75 | 1129 | if (c->psm == psm) { |
1da177e4 | 1130 | /* Exact match. */ |
23691d75 | 1131 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1132 | read_unlock(&chan_list_lock); |
23691d75 GP |
1133 | return c; |
1134 | } | |
1da177e4 LT |
1135 | |
1136 | /* Closest match */ | |
1137 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1138 | c1 = c; |
1da177e4 LT |
1139 | } |
1140 | } | |
1da177e4 | 1141 | |
23691d75 | 1142 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1143 | |
23691d75 | 1144 | return c1; |
1da177e4 LT |
1145 | } |
1146 | ||
03a00194 | 1147 | inline int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst) |
1da177e4 | 1148 | { |
5d41ce1d | 1149 | struct sock *sk = chan->sk; |
1da177e4 | 1150 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1151 | struct l2cap_conn *conn; |
1152 | struct hci_conn *hcon; | |
1153 | struct hci_dev *hdev; | |
09ab6f4c | 1154 | __u8 auth_type; |
44d0e48e | 1155 | int err; |
1da177e4 | 1156 | |
f29972de | 1157 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1158 | chan->psm); |
1da177e4 | 1159 | |
af05b30b GP |
1160 | hdev = hci_get_route(dst, src); |
1161 | if (!hdev) | |
1da177e4 LT |
1162 | return -EHOSTUNREACH; |
1163 | ||
09fd0de5 | 1164 | hci_dev_lock(hdev); |
1da177e4 | 1165 | |
03a00194 GP |
1166 | lock_sock(sk); |
1167 | ||
1168 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1169 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1170 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1171 | err = -EINVAL; | |
1172 | goto done; | |
1173 | } | |
1174 | ||
1175 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1176 | err = -EINVAL; | |
1177 | goto done; | |
1178 | } | |
1179 | ||
1180 | switch (chan->mode) { | |
1181 | case L2CAP_MODE_BASIC: | |
1182 | break; | |
1183 | case L2CAP_MODE_ERTM: | |
1184 | case L2CAP_MODE_STREAMING: | |
1185 | if (!disable_ertm) | |
1186 | break; | |
1187 | /* fall through */ | |
1188 | default: | |
1189 | err = -ENOTSUPP; | |
1190 | goto done; | |
1191 | } | |
1192 | ||
1193 | switch (sk->sk_state) { | |
1194 | case BT_CONNECT: | |
1195 | case BT_CONNECT2: | |
1196 | case BT_CONFIG: | |
1197 | /* Already connecting */ | |
1198 | err = 0; | |
1199 | goto done; | |
1200 | ||
1201 | case BT_CONNECTED: | |
1202 | /* Already connected */ | |
1203 | err = -EISCONN; | |
1204 | goto done; | |
1205 | ||
1206 | case BT_OPEN: | |
1207 | case BT_BOUND: | |
1208 | /* Can connect */ | |
1209 | break; | |
1210 | ||
1211 | default: | |
1212 | err = -EBADFD; | |
1213 | goto done; | |
1214 | } | |
1215 | ||
1216 | /* Set destination address and psm */ | |
1217 | bacpy(&bt_sk(sk)->dst, src); | |
1218 | chan->psm = psm; | |
1219 | chan->dcid = cid; | |
1220 | ||
4343478f | 1221 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1222 | |
fe4128e0 | 1223 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1224 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1225 | chan->sec_level, auth_type); |
acd7d370 VT |
1226 | else |
1227 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1228 | chan->sec_level, auth_type); |
acd7d370 | 1229 | |
30e76272 VT |
1230 | if (IS_ERR(hcon)) { |
1231 | err = PTR_ERR(hcon); | |
1da177e4 | 1232 | goto done; |
30e76272 | 1233 | } |
1da177e4 LT |
1234 | |
1235 | conn = l2cap_conn_add(hcon, 0); | |
1236 | if (!conn) { | |
1237 | hci_conn_put(hcon); | |
30e76272 | 1238 | err = -ENOMEM; |
1da177e4 LT |
1239 | goto done; |
1240 | } | |
1241 | ||
1da177e4 LT |
1242 | /* Update source addr of the socket */ |
1243 | bacpy(src, conn->src); | |
1244 | ||
48454079 GP |
1245 | l2cap_chan_add(conn, chan); |
1246 | ||
89bc500e | 1247 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1248 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1249 | |
1250 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1251 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1252 | __clear_chan_timer(chan); |
d45fc423 | 1253 | if (l2cap_chan_check_security(chan)) |
89bc500e | 1254 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1255 | } else |
fc7f8a7e | 1256 | l2cap_do_start(chan); |
1da177e4 LT |
1257 | } |
1258 | ||
30e76272 VT |
1259 | err = 0; |
1260 | ||
1da177e4 | 1261 | done: |
09fd0de5 | 1262 | hci_dev_unlock(hdev); |
1da177e4 LT |
1263 | hci_dev_put(hdev); |
1264 | return err; | |
1265 | } | |
1266 | ||
dcba0dba | 1267 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1268 | { |
8c1d787b | 1269 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1270 | DECLARE_WAITQUEUE(wait, current); |
1271 | int err = 0; | |
1272 | int timeo = HZ/5; | |
1273 | ||
2b0b05dd | 1274 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1275 | set_current_state(TASK_INTERRUPTIBLE); |
1276 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1277 | if (!timeo) |
1278 | timeo = HZ/5; | |
1279 | ||
1280 | if (signal_pending(current)) { | |
1281 | err = sock_intr_errno(timeo); | |
1282 | break; | |
1283 | } | |
1284 | ||
1285 | release_sock(sk); | |
1286 | timeo = schedule_timeout(timeo); | |
1287 | lock_sock(sk); | |
a71a0cf4 | 1288 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1289 | |
1290 | err = sock_error(sk); | |
1291 | if (err) | |
1292 | break; | |
1293 | } | |
1294 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1295 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1296 | return err; |
1297 | } | |
1298 | ||
721c4181 | 1299 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1300 | { |
721c4181 GP |
1301 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1302 | monitor_timer.work); | |
525cd185 | 1303 | struct sock *sk = chan->sk; |
e90bac06 | 1304 | |
525cd185 | 1305 | BT_DBG("chan %p", chan); |
0e98958d | 1306 | |
721c4181 | 1307 | lock_sock(sk); |
2c03a7a4 | 1308 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1309 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
721c4181 | 1310 | release_sock(sk); |
e90bac06 GP |
1311 | return; |
1312 | } | |
1313 | ||
6a026610 | 1314 | chan->retry_count++; |
1a09bcb9 | 1315 | __set_monitor_timer(chan); |
e90bac06 | 1316 | |
525cd185 | 1317 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
721c4181 | 1318 | release_sock(sk); |
e90bac06 GP |
1319 | } |
1320 | ||
721c4181 | 1321 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1322 | { |
721c4181 GP |
1323 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1324 | retrans_timer.work); | |
525cd185 | 1325 | struct sock *sk = chan->sk; |
e90bac06 | 1326 | |
49208c9c | 1327 | BT_DBG("chan %p", chan); |
0e98958d | 1328 | |
721c4181 | 1329 | lock_sock(sk); |
6a026610 | 1330 | chan->retry_count = 1; |
1a09bcb9 | 1331 | __set_monitor_timer(chan); |
e90bac06 | 1332 | |
e2ab4353 | 1333 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1334 | |
525cd185 | 1335 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
721c4181 | 1336 | release_sock(sk); |
e90bac06 GP |
1337 | } |
1338 | ||
42e5c802 | 1339 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1340 | { |
1c2acffb | 1341 | struct sk_buff *skb; |
1da177e4 | 1342 | |
58d35f87 | 1343 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1344 | chan->unacked_frames) { |
42e5c802 | 1345 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1346 | break; |
1da177e4 | 1347 | |
58d35f87 | 1348 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1349 | kfree_skb(skb); |
1da177e4 | 1350 | |
6a026610 | 1351 | chan->unacked_frames--; |
1c2acffb | 1352 | } |
1da177e4 | 1353 | |
6a026610 | 1354 | if (!chan->unacked_frames) |
1a09bcb9 | 1355 | __clear_retrans_timer(chan); |
1c2acffb | 1356 | } |
1da177e4 | 1357 | |
67c9e840 | 1358 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1359 | { |
ccbb84af | 1360 | struct sk_buff *skb; |
88843ab0 AE |
1361 | u32 control; |
1362 | u16 fcs; | |
6840ed07 | 1363 | |
58d35f87 | 1364 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1365 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1366 | control |= __set_txseq(chan, chan->next_tx_seq); |
88843ab0 | 1367 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1368 | |
47d1ec61 | 1369 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1370 | fcs = crc16(0, (u8 *)skb->data, |
1371 | skb->len - L2CAP_FCS_SIZE); | |
1372 | put_unaligned_le16(fcs, | |
1373 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1374 | } |
1375 | ||
4343478f | 1376 | l2cap_do_send(chan, skb); |
6840ed07 | 1377 | |
836be934 | 1378 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1379 | } |
6840ed07 GP |
1380 | } |
1381 | ||
fb45de7d | 1382 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1383 | { |
8f17154f | 1384 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1385 | u16 fcs; |
1386 | u32 control; | |
8f17154f | 1387 | |
58d35f87 | 1388 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1389 | if (!skb) |
1390 | return; | |
8f17154f | 1391 | |
d1726b6d | 1392 | while (bt_cb(skb)->tx_seq != tx_seq) { |
58d35f87 | 1393 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1394 | return; |
8f17154f | 1395 | |
d1726b6d SJ |
1396 | skb = skb_queue_next(&chan->tx_q, skb); |
1397 | } | |
8f17154f | 1398 | |
2c03a7a4 GP |
1399 | if (chan->remote_max_tx && |
1400 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1401 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1402 | return; |
1403 | } | |
1404 | ||
1405 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1406 | bt_cb(skb)->retries++; | |
88843ab0 AE |
1407 | |
1408 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1409 | control &= __get_sar_mask(chan); |
3cb123d1 | 1410 | |
e2ab4353 | 1411 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1412 | control |= __set_ctrl_final(chan); |
95ffa978 | 1413 | |
0b209fae | 1414 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1415 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1416 | |
88843ab0 | 1417 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1418 | |
47d1ec61 | 1419 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1420 | fcs = crc16(0, (u8 *)tx_skb->data, |
1421 | tx_skb->len - L2CAP_FCS_SIZE); | |
1422 | put_unaligned_le16(fcs, | |
1423 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1424 | } |
1425 | ||
4343478f | 1426 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1427 | } |
1428 | ||
67c9e840 | 1429 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1430 | { |
1431 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1432 | u16 fcs; |
1433 | u32 control; | |
9a9c6a34 | 1434 | int nsent = 0; |
1c2acffb | 1435 | |
89bc500e | 1436 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1437 | return -ENOTCONN; |
e90bac06 | 1438 | |
58d35f87 | 1439 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1440 | |
2c03a7a4 GP |
1441 | if (chan->remote_max_tx && |
1442 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1443 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1444 | break; |
1445 | } | |
1446 | ||
e420aba3 AE |
1447 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1448 | ||
e90bac06 GP |
1449 | bt_cb(skb)->retries++; |
1450 | ||
88843ab0 | 1451 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1452 | control &= __get_sar_mask(chan); |
95ffa978 | 1453 | |
e2ab4353 | 1454 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1455 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1456 | |
0b209fae | 1457 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1458 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb | 1459 | |
88843ab0 | 1460 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1461 | |
47d1ec61 | 1462 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1463 | fcs = crc16(0, (u8 *)skb->data, |
1464 | tx_skb->len - L2CAP_FCS_SIZE); | |
1465 | put_unaligned_le16(fcs, skb->data + | |
1466 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1467 | } |
1468 | ||
4343478f | 1469 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1470 | |
1a09bcb9 | 1471 | __set_retrans_timer(chan); |
1c2acffb | 1472 | |
42e5c802 | 1473 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
836be934 AE |
1474 | |
1475 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1476 | |
23e9fde2 | 1477 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1478 | chan->unacked_frames++; |
23e9fde2 | 1479 | |
6a026610 | 1480 | chan->frames_sent++; |
1c2acffb | 1481 | |
58d35f87 GP |
1482 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1483 | chan->tx_send_head = NULL; | |
1c2acffb | 1484 | else |
58d35f87 | 1485 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1486 | |
1487 | nsent++; | |
1c2acffb GP |
1488 | } |
1489 | ||
9e917af1 GP |
1490 | return nsent; |
1491 | } | |
1492 | ||
525cd185 | 1493 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1494 | { |
dfc909be GP |
1495 | int ret; |
1496 | ||
58d35f87 GP |
1497 | if (!skb_queue_empty(&chan->tx_q)) |
1498 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1499 | |
42e5c802 | 1500 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1501 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1502 | return ret; |
1503 | } | |
1504 | ||
525cd185 | 1505 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1506 | { |
88843ab0 | 1507 | u32 control = 0; |
9e917af1 | 1508 | |
0b209fae | 1509 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1510 | |
e2ab4353 | 1511 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1512 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1513 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1514 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1515 | return; |
9e917af1 | 1516 | } |
dfc909be | 1517 | |
525cd185 | 1518 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1519 | return; |
1520 | ||
ab784b73 | 1521 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1522 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1523 | } |
1524 | ||
525cd185 | 1525 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1526 | { |
1527 | struct srej_list *tail; | |
88843ab0 | 1528 | u32 control; |
99b0d4b7 | 1529 | |
ab784b73 | 1530 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1531 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1532 | |
39d5a3ee | 1533 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1534 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1535 | |
525cd185 | 1536 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1537 | } |
1538 | ||
1c2acffb GP |
1539 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1540 | { | |
8c1d787b | 1541 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1542 | struct sk_buff **frag; |
1543 | int err, sent = 0; | |
1da177e4 | 1544 | |
59203a21 | 1545 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1546 | return -EFAULT; |
1da177e4 LT |
1547 | |
1548 | sent += count; | |
1549 | len -= count; | |
1550 | ||
1551 | /* Continuation fragments (no L2CAP header) */ | |
1552 | frag = &skb_shinfo(skb)->frag_list; | |
1553 | while (len) { | |
1554 | count = min_t(unsigned int, conn->mtu, len); | |
1555 | ||
1556 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1557 | if (!*frag) | |
0175d629 | 1558 | return err; |
1c2acffb GP |
1559 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1560 | return -EFAULT; | |
1da177e4 | 1561 | |
5e59b791 LAD |
1562 | (*frag)->priority = skb->priority; |
1563 | ||
1da177e4 LT |
1564 | sent += count; |
1565 | len -= count; | |
1566 | ||
1567 | frag = &(*frag)->next; | |
1568 | } | |
1da177e4 LT |
1569 | |
1570 | return sent; | |
1c2acffb | 1571 | } |
1da177e4 | 1572 | |
5e59b791 LAD |
1573 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1574 | struct msghdr *msg, size_t len, | |
1575 | u32 priority) | |
1c2acffb | 1576 | { |
fe4128e0 | 1577 | struct sock *sk = chan->sk; |
8c1d787b | 1578 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1579 | struct sk_buff *skb; |
03a51213 | 1580 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1581 | struct l2cap_hdr *lh; |
1582 | ||
5e59b791 | 1583 | BT_DBG("sk %p len %d priority %u", sk, (int)len, priority); |
1c2acffb GP |
1584 | |
1585 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1586 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1587 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1588 | if (!skb) | |
0175d629 | 1589 | return ERR_PTR(err); |
1c2acffb | 1590 | |
5e59b791 LAD |
1591 | skb->priority = priority; |
1592 | ||
1c2acffb GP |
1593 | /* Create L2CAP header */ |
1594 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1595 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1596 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1597 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1598 | |
1599 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1600 | if (unlikely(err < 0)) { | |
1601 | kfree_skb(skb); | |
1602 | return ERR_PTR(err); | |
1603 | } | |
1604 | return skb; | |
1605 | } | |
1606 | ||
5e59b791 LAD |
1607 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1608 | struct msghdr *msg, size_t len, | |
1609 | u32 priority) | |
1c2acffb | 1610 | { |
fe4128e0 | 1611 | struct sock *sk = chan->sk; |
8c1d787b | 1612 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1613 | struct sk_buff *skb; |
1614 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1615 | struct l2cap_hdr *lh; | |
1616 | ||
1617 | BT_DBG("sk %p len %d", sk, (int)len); | |
1618 | ||
1619 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1620 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1621 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1622 | if (!skb) | |
0175d629 | 1623 | return ERR_PTR(err); |
1c2acffb | 1624 | |
5e59b791 LAD |
1625 | skb->priority = priority; |
1626 | ||
1c2acffb GP |
1627 | /* Create L2CAP header */ |
1628 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1629 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1630 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1631 | ||
1632 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1633 | if (unlikely(err < 0)) { | |
1634 | kfree_skb(skb); | |
1635 | return ERR_PTR(err); | |
1636 | } | |
1637 | return skb; | |
1638 | } | |
1639 | ||
ab0ff76d LAD |
1640 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1641 | struct msghdr *msg, size_t len, | |
88843ab0 | 1642 | u32 control, u16 sdulen) |
1c2acffb | 1643 | { |
47d1ec61 | 1644 | struct sock *sk = chan->sk; |
8c1d787b | 1645 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1646 | struct sk_buff *skb; |
e4ca6d98 | 1647 | int err, count, hlen; |
1c2acffb GP |
1648 | struct l2cap_hdr *lh; |
1649 | ||
1650 | BT_DBG("sk %p len %d", sk, (int)len); | |
1651 | ||
0ee0d208 GP |
1652 | if (!conn) |
1653 | return ERR_PTR(-ENOTCONN); | |
1654 | ||
e4ca6d98 AE |
1655 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1656 | hlen = L2CAP_EXT_HDR_SIZE; | |
1657 | else | |
1658 | hlen = L2CAP_ENH_HDR_SIZE; | |
1659 | ||
c74e560c | 1660 | if (sdulen) |
03a51213 | 1661 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1662 | |
47d1ec61 | 1663 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1664 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1665 | |
1c2acffb GP |
1666 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1667 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1668 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1669 | if (!skb) | |
0175d629 | 1670 | return ERR_PTR(err); |
1c2acffb GP |
1671 | |
1672 | /* Create L2CAP header */ | |
1673 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1674 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1675 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 AE |
1676 | |
1677 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1678 | ||
c74e560c | 1679 | if (sdulen) |
03a51213 | 1680 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb GP |
1681 | |
1682 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1683 | if (unlikely(err < 0)) { | |
1684 | kfree_skb(skb); | |
1685 | return ERR_PTR(err); | |
1686 | } | |
e90bac06 | 1687 | |
47d1ec61 | 1688 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1689 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1690 | |
e90bac06 | 1691 | bt_cb(skb)->retries = 0; |
1c2acffb | 1692 | return skb; |
1da177e4 LT |
1693 | } |
1694 | ||
67c9e840 | 1695 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1696 | { |
c74e560c GP |
1697 | struct sk_buff *skb; |
1698 | struct sk_buff_head sar_queue; | |
88843ab0 | 1699 | u32 control; |
c74e560c GP |
1700 | size_t size = 0; |
1701 | ||
ff12fd64 | 1702 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1703 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1704 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1705 | if (IS_ERR(skb)) |
1706 | return PTR_ERR(skb); | |
1707 | ||
1708 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1709 | len -= chan->remote_mps; |
1710 | size += chan->remote_mps; | |
c74e560c GP |
1711 | |
1712 | while (len > 0) { | |
1713 | size_t buflen; | |
1714 | ||
2c03a7a4 | 1715 | if (len > chan->remote_mps) { |
7e0ef6ee | 1716 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1717 | buflen = chan->remote_mps; |
c74e560c | 1718 | } else { |
7e0ef6ee | 1719 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1720 | buflen = len; |
1721 | } | |
1722 | ||
47d1ec61 | 1723 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1724 | if (IS_ERR(skb)) { |
1725 | skb_queue_purge(&sar_queue); | |
1726 | return PTR_ERR(skb); | |
1727 | } | |
1728 | ||
1729 | __skb_queue_tail(&sar_queue, skb); | |
1730 | len -= buflen; | |
1731 | size += buflen; | |
c74e560c | 1732 | } |
58d35f87 GP |
1733 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1734 | if (chan->tx_send_head == NULL) | |
1735 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1736 | |
1737 | return size; | |
1738 | } | |
1739 | ||
5e59b791 LAD |
1740 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
1741 | u32 priority) | |
9a91a04a | 1742 | { |
9a91a04a | 1743 | struct sk_buff *skb; |
88843ab0 | 1744 | u32 control; |
9a91a04a GP |
1745 | int err; |
1746 | ||
1747 | /* Connectionless channel */ | |
715ec005 | 1748 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 1749 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
1750 | if (IS_ERR(skb)) |
1751 | return PTR_ERR(skb); | |
1752 | ||
1753 | l2cap_do_send(chan, skb); | |
1754 | return len; | |
1755 | } | |
1756 | ||
1757 | switch (chan->mode) { | |
1758 | case L2CAP_MODE_BASIC: | |
1759 | /* Check outgoing MTU */ | |
1760 | if (len > chan->omtu) | |
1761 | return -EMSGSIZE; | |
1762 | ||
1763 | /* Create a basic PDU */ | |
5e59b791 | 1764 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
1765 | if (IS_ERR(skb)) |
1766 | return PTR_ERR(skb); | |
1767 | ||
1768 | l2cap_do_send(chan, skb); | |
1769 | err = len; | |
1770 | break; | |
1771 | ||
1772 | case L2CAP_MODE_ERTM: | |
1773 | case L2CAP_MODE_STREAMING: | |
1774 | /* Entire SDU fits into one PDU */ | |
1775 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1776 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1777 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1778 | 0); | |
1779 | if (IS_ERR(skb)) | |
1780 | return PTR_ERR(skb); | |
1781 | ||
1782 | __skb_queue_tail(&chan->tx_q, skb); | |
1783 | ||
1784 | if (chan->tx_send_head == NULL) | |
1785 | chan->tx_send_head = skb; | |
1786 | ||
1787 | } else { | |
1788 | /* Segment SDU into multiples PDUs */ | |
1789 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1790 | if (err < 0) | |
1791 | return err; | |
1792 | } | |
1793 | ||
1794 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1795 | l2cap_streaming_send(chan); | |
1796 | err = len; | |
1797 | break; | |
1798 | } | |
1799 | ||
e2ab4353 GP |
1800 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1801 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1802 | err = len; |
1803 | break; | |
1804 | } | |
1805 | ||
1806 | err = l2cap_ertm_send(chan); | |
1807 | if (err >= 0) | |
1808 | err = len; | |
1809 | ||
1810 | break; | |
1811 | ||
1812 | default: | |
1813 | BT_DBG("bad state %1.1x", chan->mode); | |
1814 | err = -EBADFD; | |
1815 | } | |
1816 | ||
1817 | return err; | |
1818 | } | |
1819 | ||
1da177e4 LT |
1820 | /* Copy frame to all raw sockets on that connection */ |
1821 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1822 | { | |
1da177e4 | 1823 | struct sk_buff *nskb; |
48454079 | 1824 | struct l2cap_chan *chan; |
1da177e4 LT |
1825 | |
1826 | BT_DBG("conn %p", conn); | |
1827 | ||
3d57dc68 GP |
1828 | rcu_read_lock(); |
1829 | ||
1830 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { | |
48454079 | 1831 | struct sock *sk = chan->sk; |
715ec005 | 1832 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1833 | continue; |
1834 | ||
1835 | /* Don't send frame to the socket it came from */ | |
1836 | if (skb->sk == sk) | |
1837 | continue; | |
af05b30b GP |
1838 | nskb = skb_clone(skb, GFP_ATOMIC); |
1839 | if (!nskb) | |
1da177e4 LT |
1840 | continue; |
1841 | ||
23070494 | 1842 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1843 | kfree_skb(nskb); |
1844 | } | |
3d57dc68 GP |
1845 | |
1846 | rcu_read_unlock(); | |
1da177e4 LT |
1847 | } |
1848 | ||
1849 | /* ---- L2CAP signalling commands ---- */ | |
1850 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1851 | u8 code, u8 ident, u16 dlen, void *data) | |
1852 | { | |
1853 | struct sk_buff *skb, **frag; | |
1854 | struct l2cap_cmd_hdr *cmd; | |
1855 | struct l2cap_hdr *lh; | |
1856 | int len, count; | |
1857 | ||
af05b30b GP |
1858 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1859 | conn, code, ident, dlen); | |
1da177e4 LT |
1860 | |
1861 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1862 | count = min_t(unsigned int, conn->mtu, len); | |
1863 | ||
1864 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1865 | if (!skb) | |
1866 | return NULL; | |
1867 | ||
1868 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1869 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1870 | |
1871 | if (conn->hcon->type == LE_LINK) | |
1872 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1873 | else | |
1874 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1875 | |
1876 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1877 | cmd->code = code; | |
1878 | cmd->ident = ident; | |
aca3192c | 1879 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1880 | |
1881 | if (dlen) { | |
1882 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1883 | memcpy(skb_put(skb, count), data, count); | |
1884 | data += count; | |
1885 | } | |
1886 | ||
1887 | len -= skb->len; | |
1888 | ||
1889 | /* Continuation fragments (no L2CAP header) */ | |
1890 | frag = &skb_shinfo(skb)->frag_list; | |
1891 | while (len) { | |
1892 | count = min_t(unsigned int, conn->mtu, len); | |
1893 | ||
1894 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1895 | if (!*frag) | |
1896 | goto fail; | |
1897 | ||
1898 | memcpy(skb_put(*frag, count), data, count); | |
1899 | ||
1900 | len -= count; | |
1901 | data += count; | |
1902 | ||
1903 | frag = &(*frag)->next; | |
1904 | } | |
1905 | ||
1906 | return skb; | |
1907 | ||
1908 | fail: | |
1909 | kfree_skb(skb); | |
1910 | return NULL; | |
1911 | } | |
1912 | ||
1913 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1914 | { | |
1915 | struct l2cap_conf_opt *opt = *ptr; | |
1916 | int len; | |
1917 | ||
1918 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1919 | *ptr += len; | |
1920 | ||
1921 | *type = opt->type; | |
1922 | *olen = opt->len; | |
1923 | ||
1924 | switch (opt->len) { | |
1925 | case 1: | |
1926 | *val = *((u8 *) opt->val); | |
1927 | break; | |
1928 | ||
1929 | case 2: | |
bfaaeb3e | 1930 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1931 | break; |
1932 | ||
1933 | case 4: | |
bfaaeb3e | 1934 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1935 | break; |
1936 | ||
1937 | default: | |
1938 | *val = (unsigned long) opt->val; | |
1939 | break; | |
1940 | } | |
1941 | ||
1942 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1943 | return len; | |
1944 | } | |
1945 | ||
1da177e4 LT |
1946 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1947 | { | |
1948 | struct l2cap_conf_opt *opt = *ptr; | |
1949 | ||
1950 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1951 | ||
1952 | opt->type = type; | |
1953 | opt->len = len; | |
1954 | ||
1955 | switch (len) { | |
1956 | case 1: | |
1957 | *((u8 *) opt->val) = val; | |
1958 | break; | |
1959 | ||
1960 | case 2: | |
4f8b691c | 1961 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1962 | break; |
1963 | ||
1964 | case 4: | |
4f8b691c | 1965 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1966 | break; |
1967 | ||
1968 | default: | |
1969 | memcpy(opt->val, (void *) val, len); | |
1970 | break; | |
1971 | } | |
1972 | ||
1973 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1974 | } | |
1975 | ||
f89cef09 AE |
1976 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
1977 | { | |
1978 | struct l2cap_conf_efs efs; | |
1979 | ||
1ec918ce | 1980 | switch (chan->mode) { |
f89cef09 AE |
1981 | case L2CAP_MODE_ERTM: |
1982 | efs.id = chan->local_id; | |
1983 | efs.stype = chan->local_stype; | |
1984 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1985 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1986 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
1987 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
1988 | break; | |
1989 | ||
1990 | case L2CAP_MODE_STREAMING: | |
1991 | efs.id = 1; | |
1992 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
1993 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1994 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1995 | efs.acc_lat = 0; | |
1996 | efs.flush_to = 0; | |
1997 | break; | |
1998 | ||
1999 | default: | |
2000 | return; | |
2001 | } | |
2002 | ||
2003 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2004 | (unsigned long) &efs); | |
2005 | } | |
2006 | ||
721c4181 | 2007 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2008 | { |
721c4181 GP |
2009 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2010 | ack_timer.work); | |
c1b4f43b | 2011 | |
721c4181 | 2012 | lock_sock(chan->sk); |
525cd185 | 2013 | l2cap_send_ack(chan); |
721c4181 | 2014 | release_sock(chan->sk); |
c1b4f43b GP |
2015 | } |
2016 | ||
525cd185 | 2017 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2018 | { |
42e5c802 | 2019 | chan->expected_ack_seq = 0; |
6a026610 | 2020 | chan->unacked_frames = 0; |
42e5c802 | 2021 | chan->buffer_seq = 0; |
6a026610 GP |
2022 | chan->num_acked = 0; |
2023 | chan->frames_sent = 0; | |
0565c1c2 | 2024 | |
721c4181 GP |
2025 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2026 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2027 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2028 | |
f1c6775b | 2029 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2030 | |
39d5a3ee | 2031 | INIT_LIST_HEAD(&chan->srej_l); |
0565c1c2 GP |
2032 | } |
2033 | ||
f2fcfcd6 GP |
2034 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2035 | { | |
2036 | switch (mode) { | |
2037 | case L2CAP_MODE_STREAMING: | |
2038 | case L2CAP_MODE_ERTM: | |
2039 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2040 | return mode; | |
2041 | /* fall through */ | |
2042 | default: | |
2043 | return L2CAP_MODE_BASIC; | |
2044 | } | |
2045 | } | |
2046 | ||
6327eb98 AE |
2047 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2048 | { | |
2049 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2050 | } | |
2051 | ||
f89cef09 AE |
2052 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2053 | { | |
2054 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2055 | } | |
2056 | ||
6327eb98 AE |
2057 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2058 | { | |
2059 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2060 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2061 | /* use extended control field */ |
2062 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2063 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2064 | } else { | |
6327eb98 AE |
2065 | chan->tx_win = min_t(u16, chan->tx_win, |
2066 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2067 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2068 | } | |
6327eb98 AE |
2069 | } |
2070 | ||
710f9b0a | 2071 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2072 | { |
1da177e4 | 2073 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2074 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2075 | void *ptr = req->data; |
c8f79162 | 2076 | u16 size; |
1da177e4 | 2077 | |
49208c9c | 2078 | BT_DBG("chan %p", chan); |
1da177e4 | 2079 | |
73ffa904 | 2080 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2081 | goto done; |
2082 | ||
0c1bc5c6 | 2083 | switch (chan->mode) { |
f2fcfcd6 GP |
2084 | case L2CAP_MODE_STREAMING: |
2085 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2086 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2087 | break; |
85eb53c6 | 2088 | |
f89cef09 AE |
2089 | if (__l2cap_efs_supported(chan)) |
2090 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2091 | ||
2ba13ed6 | 2092 | /* fall through */ |
f2fcfcd6 | 2093 | default: |
8c1d787b | 2094 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2095 | break; |
2096 | } | |
2097 | ||
2098 | done: | |
0c1bc5c6 GP |
2099 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2100 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2101 | |
0c1bc5c6 | 2102 | switch (chan->mode) { |
65c7c491 | 2103 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2104 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2105 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2106 | break; |
2107 | ||
62547752 GP |
2108 | rfc.mode = L2CAP_MODE_BASIC; |
2109 | rfc.txwin_size = 0; | |
2110 | rfc.max_transmit = 0; | |
2111 | rfc.retrans_timeout = 0; | |
2112 | rfc.monitor_timeout = 0; | |
2113 | rfc.max_pdu_size = 0; | |
2114 | ||
63406504 GP |
2115 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2116 | (unsigned long) &rfc); | |
65c7c491 MH |
2117 | break; |
2118 | ||
2119 | case L2CAP_MODE_ERTM: | |
2120 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2121 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2122 | rfc.retrans_timeout = 0; |
2123 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2124 | |
2125 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2126 | L2CAP_EXT_HDR_SIZE - | |
2127 | L2CAP_SDULEN_SIZE - | |
2128 | L2CAP_FCS_SIZE); | |
2129 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2130 | |
6327eb98 AE |
2131 | l2cap_txwin_setup(chan); |
2132 | ||
2133 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2134 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2135 | |
63406504 GP |
2136 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2137 | (unsigned long) &rfc); | |
2138 | ||
f89cef09 AE |
2139 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2140 | l2cap_add_opt_efs(&ptr, chan); | |
2141 | ||
8c1d787b | 2142 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2143 | break; |
2144 | ||
47d1ec61 | 2145 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2146 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2147 | chan->fcs = L2CAP_FCS_NONE; |
2148 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2149 | } |
6327eb98 AE |
2150 | |
2151 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2152 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2153 | chan->tx_win); | |
f2fcfcd6 GP |
2154 | break; |
2155 | ||
2156 | case L2CAP_MODE_STREAMING: | |
2157 | rfc.mode = L2CAP_MODE_STREAMING; | |
2158 | rfc.txwin_size = 0; | |
2159 | rfc.max_transmit = 0; | |
2160 | rfc.retrans_timeout = 0; | |
2161 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2162 | |
2163 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2164 | L2CAP_EXT_HDR_SIZE - | |
2165 | L2CAP_SDULEN_SIZE - | |
2166 | L2CAP_FCS_SIZE); | |
2167 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2168 | |
63406504 GP |
2169 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2170 | (unsigned long) &rfc); | |
2171 | ||
f89cef09 AE |
2172 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2173 | l2cap_add_opt_efs(&ptr, chan); | |
2174 | ||
8c1d787b | 2175 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2176 | break; |
2177 | ||
47d1ec61 | 2178 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2179 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2180 | chan->fcs = L2CAP_FCS_NONE; |
2181 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2182 | } |
65c7c491 MH |
2183 | break; |
2184 | } | |
1da177e4 | 2185 | |
fe4128e0 | 2186 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2187 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2188 | |
2189 | return ptr - data; | |
2190 | } | |
2191 | ||
73ffa904 | 2192 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2193 | { |
5dee9e7c MH |
2194 | struct l2cap_conf_rsp *rsp = data; |
2195 | void *ptr = rsp->data; | |
73ffa904 GP |
2196 | void *req = chan->conf_req; |
2197 | int len = chan->conf_len; | |
5dee9e7c MH |
2198 | int type, hint, olen; |
2199 | unsigned long val; | |
6464f35f | 2200 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2201 | struct l2cap_conf_efs efs; |
2202 | u8 remote_efs = 0; | |
861d6882 | 2203 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2204 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2205 | u16 size; |
1da177e4 | 2206 | |
73ffa904 | 2207 | BT_DBG("chan %p", chan); |
820ae1b8 | 2208 | |
5dee9e7c MH |
2209 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2210 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2211 | |
589d2746 | 2212 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2213 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2214 | |
2215 | switch (type) { | |
2216 | case L2CAP_CONF_MTU: | |
861d6882 | 2217 | mtu = val; |
5dee9e7c MH |
2218 | break; |
2219 | ||
2220 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2221 | chan->flush_to = val; |
5dee9e7c MH |
2222 | break; |
2223 | ||
2224 | case L2CAP_CONF_QOS: | |
2225 | break; | |
2226 | ||
6464f35f MH |
2227 | case L2CAP_CONF_RFC: |
2228 | if (olen == sizeof(rfc)) | |
2229 | memcpy(&rfc, (void *) val, olen); | |
2230 | break; | |
2231 | ||
fcc203c3 GP |
2232 | case L2CAP_CONF_FCS: |
2233 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2234 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2235 | break; |
fcc203c3 | 2236 | |
42dceae2 AE |
2237 | case L2CAP_CONF_EFS: |
2238 | remote_efs = 1; | |
2239 | if (olen == sizeof(efs)) | |
2240 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2241 | break; |
2242 | ||
6327eb98 AE |
2243 | case L2CAP_CONF_EWS: |
2244 | if (!enable_hs) | |
2245 | return -ECONNREFUSED; | |
fcc203c3 | 2246 | |
6327eb98 AE |
2247 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2248 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2249 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2250 | chan->remote_tx_win = val; |
fcc203c3 GP |
2251 | break; |
2252 | ||
5dee9e7c MH |
2253 | default: |
2254 | if (hint) | |
2255 | break; | |
2256 | ||
2257 | result = L2CAP_CONF_UNKNOWN; | |
2258 | *((u8 *) ptr++) = type; | |
2259 | break; | |
2260 | } | |
2261 | } | |
2262 | ||
73ffa904 | 2263 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2264 | goto done; |
2265 | ||
0c1bc5c6 | 2266 | switch (chan->mode) { |
f2fcfcd6 GP |
2267 | case L2CAP_MODE_STREAMING: |
2268 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2269 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2270 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2271 | chan->conn->feat_mask); |
85eb53c6 GP |
2272 | break; |
2273 | } | |
2274 | ||
42dceae2 AE |
2275 | if (remote_efs) { |
2276 | if (__l2cap_efs_supported(chan)) | |
2277 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2278 | else | |
2279 | return -ECONNREFUSED; | |
2280 | } | |
2281 | ||
0c1bc5c6 | 2282 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2283 | return -ECONNREFUSED; |
742e519b | 2284 | |
f2fcfcd6 | 2285 | break; |
f2fcfcd6 GP |
2286 | } |
2287 | ||
2288 | done: | |
0c1bc5c6 | 2289 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2290 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2291 | rfc.mode = chan->mode; |
f2fcfcd6 | 2292 | |
73ffa904 | 2293 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2294 | return -ECONNREFUSED; |
2295 | ||
2296 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2297 | sizeof(rfc), (unsigned long) &rfc); | |
2298 | } | |
2299 | ||
5dee9e7c MH |
2300 | if (result == L2CAP_CONF_SUCCESS) { |
2301 | /* Configure output options and let the other side know | |
2302 | * which ones we don't like. */ | |
2303 | ||
f2fcfcd6 GP |
2304 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2305 | result = L2CAP_CONF_UNACCEPT; | |
2306 | else { | |
0c1bc5c6 | 2307 | chan->omtu = mtu; |
c1360a1c | 2308 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2309 | } |
0c1bc5c6 | 2310 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2311 | |
42dceae2 AE |
2312 | if (remote_efs) { |
2313 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2314 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2315 | efs.stype != chan->local_stype) { | |
2316 | ||
2317 | result = L2CAP_CONF_UNACCEPT; | |
2318 | ||
2319 | if (chan->num_conf_req >= 1) | |
2320 | return -ECONNREFUSED; | |
2321 | ||
2322 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2323 | sizeof(efs), |
42dceae2 | 2324 | (unsigned long) &efs); |
0e8b207e | 2325 | } else { |
3e6b3b95 | 2326 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2327 | result = L2CAP_CONF_PENDING; |
2328 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2329 | } |
2330 | } | |
2331 | ||
f2fcfcd6 GP |
2332 | switch (rfc.mode) { |
2333 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2334 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2335 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2336 | break; |
2337 | ||
2338 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2339 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2340 | chan->remote_tx_win = rfc.txwin_size; | |
2341 | else | |
2342 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2343 | |
2c03a7a4 | 2344 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2345 | |
c8f79162 AE |
2346 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2347 | chan->conn->mtu - | |
2348 | L2CAP_EXT_HDR_SIZE - | |
2349 | L2CAP_SDULEN_SIZE - | |
2350 | L2CAP_FCS_SIZE); | |
2351 | rfc.max_pdu_size = cpu_to_le16(size); | |
2352 | chan->remote_mps = size; | |
f2fcfcd6 | 2353 | |
10467e9e GP |
2354 | rfc.retrans_timeout = |
2355 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2356 | rfc.monitor_timeout = | |
2357 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2358 | |
c1360a1c | 2359 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2360 | |
2361 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2362 | sizeof(rfc), (unsigned long) &rfc); | |
2363 | ||
42dceae2 AE |
2364 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2365 | chan->remote_id = efs.id; | |
2366 | chan->remote_stype = efs.stype; | |
2367 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2368 | chan->remote_flush_to = | |
2369 | le32_to_cpu(efs.flush_to); | |
2370 | chan->remote_acc_lat = | |
2371 | le32_to_cpu(efs.acc_lat); | |
2372 | chan->remote_sdu_itime = | |
2373 | le32_to_cpu(efs.sdu_itime); | |
2374 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2375 | sizeof(efs), (unsigned long) &efs); | |
2376 | } | |
f2fcfcd6 GP |
2377 | break; |
2378 | ||
2379 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2380 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2381 | chan->conn->mtu - | |
2382 | L2CAP_EXT_HDR_SIZE - | |
2383 | L2CAP_SDULEN_SIZE - | |
2384 | L2CAP_FCS_SIZE); | |
2385 | rfc.max_pdu_size = cpu_to_le16(size); | |
2386 | chan->remote_mps = size; | |
f2fcfcd6 | 2387 | |
c1360a1c | 2388 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2389 | |
2390 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2391 | sizeof(rfc), (unsigned long) &rfc); | |
2392 | ||
f2fcfcd6 GP |
2393 | break; |
2394 | ||
2395 | default: | |
5dee9e7c | 2396 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2397 | |
6464f35f | 2398 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2399 | rfc.mode = chan->mode; |
f2fcfcd6 | 2400 | } |
6464f35f | 2401 | |
f2fcfcd6 | 2402 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2403 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2404 | } |
fe4128e0 | 2405 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2406 | rsp->result = cpu_to_le16(result); |
2407 | rsp->flags = cpu_to_le16(0x0000); | |
2408 | ||
2409 | return ptr - data; | |
1da177e4 LT |
2410 | } |
2411 | ||
b4450035 | 2412 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2413 | { |
f2fcfcd6 GP |
2414 | struct l2cap_conf_req *req = data; |
2415 | void *ptr = req->data; | |
2416 | int type, olen; | |
2417 | unsigned long val; | |
2418 | struct l2cap_conf_rfc rfc; | |
66af7aaf | 2419 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2420 | |
fe4128e0 | 2421 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2422 | |
2423 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2424 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2425 | ||
2426 | switch (type) { | |
2427 | case L2CAP_CONF_MTU: | |
2428 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2429 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2430 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2431 | } else |
0c1bc5c6 GP |
2432 | chan->imtu = val; |
2433 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2434 | break; |
2435 | ||
2436 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2437 | chan->flush_to = val; |
f2fcfcd6 | 2438 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2439 | 2, chan->flush_to); |
f2fcfcd6 GP |
2440 | break; |
2441 | ||
2442 | case L2CAP_CONF_RFC: | |
2443 | if (olen == sizeof(rfc)) | |
2444 | memcpy(&rfc, (void *)val, olen); | |
2445 | ||
c1360a1c | 2446 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2447 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2448 | return -ECONNREFUSED; |
2449 | ||
47d1ec61 | 2450 | chan->fcs = 0; |
f2fcfcd6 GP |
2451 | |
2452 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2453 | sizeof(rfc), (unsigned long) &rfc); | |
2454 | break; | |
6327eb98 AE |
2455 | |
2456 | case L2CAP_CONF_EWS: | |
2457 | chan->tx_win = min_t(u16, val, | |
2458 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2459 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2460 | chan->tx_win); | |
6327eb98 | 2461 | break; |
66af7aaf AE |
2462 | |
2463 | case L2CAP_CONF_EFS: | |
2464 | if (olen == sizeof(efs)) | |
2465 | memcpy(&efs, (void *)val, olen); | |
2466 | ||
2467 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2468 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2469 | efs.stype != chan->local_stype) | |
2470 | return -ECONNREFUSED; | |
2471 | ||
2472 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2473 | sizeof(efs), (unsigned long) &efs); | |
2474 | break; | |
f2fcfcd6 GP |
2475 | } |
2476 | } | |
2477 | ||
0c1bc5c6 | 2478 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2479 | return -ECONNREFUSED; |
2480 | ||
0c1bc5c6 | 2481 | chan->mode = rfc.mode; |
6c2ea7a8 | 2482 | |
0e8b207e | 2483 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2484 | switch (rfc.mode) { |
2485 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2486 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2487 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2488 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2489 | |
2490 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2491 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2492 | chan->local_sdu_itime = | |
2493 | le32_to_cpu(efs.sdu_itime); | |
2494 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2495 | chan->local_flush_to = | |
2496 | le32_to_cpu(efs.flush_to); | |
2497 | } | |
f2fcfcd6 | 2498 | break; |
66af7aaf | 2499 | |
f2fcfcd6 | 2500 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2501 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2502 | } |
2503 | } | |
2504 | ||
fe4128e0 | 2505 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2506 | req->flags = cpu_to_le16(0x0000); |
2507 | ||
2508 | return ptr - data; | |
2509 | } | |
2510 | ||
fe4128e0 | 2511 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2512 | { |
2513 | struct l2cap_conf_rsp *rsp = data; | |
2514 | void *ptr = rsp->data; | |
1da177e4 | 2515 | |
fe4128e0 | 2516 | BT_DBG("chan %p", chan); |
1da177e4 | 2517 | |
fe4128e0 | 2518 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2519 | rsp->result = cpu_to_le16(result); |
aca3192c | 2520 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2521 | |
2522 | return ptr - data; | |
2523 | } | |
2524 | ||
8c1d787b | 2525 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2526 | { |
2527 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2528 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2529 | u8 buf[128]; |
2530 | ||
fe4128e0 GP |
2531 | rsp.scid = cpu_to_le16(chan->dcid); |
2532 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2533 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2534 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2535 | l2cap_send_cmd(conn, chan->ident, | |
2536 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2537 | ||
c1360a1c | 2538 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2539 | return; |
2540 | ||
710f9b0a GP |
2541 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2542 | l2cap_build_conf_req(chan, buf), buf); | |
2543 | chan->num_conf_req++; | |
2544 | } | |
2545 | ||
47d1ec61 | 2546 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2547 | { |
7b1c0049 GP |
2548 | int type, olen; |
2549 | unsigned long val; | |
2550 | struct l2cap_conf_rfc rfc; | |
2551 | ||
47d1ec61 | 2552 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2553 | |
0c1bc5c6 | 2554 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2555 | return; |
2556 | ||
2557 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2558 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2559 | ||
2560 | switch (type) { | |
2561 | case L2CAP_CONF_RFC: | |
2562 | if (olen == sizeof(rfc)) | |
2563 | memcpy(&rfc, (void *)val, olen); | |
2564 | goto done; | |
2565 | } | |
2566 | } | |
2567 | ||
2568 | done: | |
2569 | switch (rfc.mode) { | |
2570 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2571 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2572 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2573 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2574 | break; |
2575 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2576 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2577 | } |
2578 | } | |
2579 | ||
4e8402a3 MH |
2580 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2581 | { | |
e2fd318e | 2582 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2583 | |
e2fd318e | 2584 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2585 | return 0; |
2586 | ||
2587 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2588 | cmd->ident == conn->info_ident) { | |
f878fcad | 2589 | cancel_delayed_work_sync(&conn->info_work); |
984947dc MH |
2590 | |
2591 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2592 | conn->info_ident = 0; |
984947dc | 2593 | |
4e8402a3 MH |
2594 | l2cap_conn_start(conn); |
2595 | } | |
2596 | ||
2597 | return 0; | |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2601 | { | |
1da177e4 LT |
2602 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2603 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2604 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2605 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2606 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2607 | |
2608 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2609 | __le16 psm = req->psm; |
1da177e4 LT |
2610 | |
2611 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2612 | ||
2613 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2614 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2615 | if (!pchan) { | |
1da177e4 LT |
2616 | result = L2CAP_CR_BAD_PSM; |
2617 | goto sendresp; | |
2618 | } | |
2619 | ||
23691d75 GP |
2620 | parent = pchan->sk; |
2621 | ||
aa2ac881 | 2622 | lock_sock(parent); |
e0f0cb56 | 2623 | |
e7c29cb1 MH |
2624 | /* Check if the ACL is secure enough (if not SDP) */ |
2625 | if (psm != cpu_to_le16(0x0001) && | |
2626 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2627 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2628 | result = L2CAP_CR_SEC_BLOCK; |
2629 | goto response; | |
2630 | } | |
2631 | ||
1da177e4 LT |
2632 | result = L2CAP_CR_NO_MEM; |
2633 | ||
2634 | /* Check for backlog size */ | |
2635 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2636 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2637 | goto response; |
2638 | } | |
2639 | ||
80808e43 GP |
2640 | chan = pchan->ops->new_connection(pchan->data); |
2641 | if (!chan) | |
1da177e4 LT |
2642 | goto response; |
2643 | ||
80808e43 GP |
2644 | sk = chan->sk; |
2645 | ||
1da177e4 | 2646 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 2647 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 2648 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2649 | chan->ops->close(chan->data); |
1da177e4 LT |
2650 | goto response; |
2651 | } | |
2652 | ||
2653 | hci_conn_hold(conn->hcon); | |
2654 | ||
1da177e4 LT |
2655 | bacpy(&bt_sk(sk)->src, conn->src); |
2656 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2657 | chan->psm = psm; |
2658 | chan->dcid = scid; | |
1da177e4 | 2659 | |
d1010240 GP |
2660 | bt_accept_enqueue(parent, sk); |
2661 | ||
3d57dc68 | 2662 | l2cap_chan_add(conn, chan); |
48454079 | 2663 | |
fe4128e0 | 2664 | dcid = chan->scid; |
1da177e4 | 2665 | |
c9b66675 | 2666 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2667 | |
fc7f8a7e | 2668 | chan->ident = cmd->ident; |
1da177e4 | 2669 | |
984947dc | 2670 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 2671 | if (l2cap_chan_check_security(chan)) { |
f66dc81f | 2672 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2673 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2674 | result = L2CAP_CR_PEND; |
2675 | status = L2CAP_CS_AUTHOR_PEND; | |
2676 | parent->sk_data_ready(parent, 0); | |
2677 | } else { | |
89bc500e | 2678 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2679 | result = L2CAP_CR_SUCCESS; |
2680 | status = L2CAP_CS_NO_INFO; | |
2681 | } | |
79d554a6 | 2682 | } else { |
89bc500e | 2683 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2684 | result = L2CAP_CR_PEND; |
2685 | status = L2CAP_CS_AUTHEN_PEND; | |
2686 | } | |
2687 | } else { | |
89bc500e | 2688 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2689 | result = L2CAP_CR_PEND; |
2690 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2691 | } |
2692 | ||
1da177e4 | 2693 | response: |
aa2ac881 | 2694 | release_sock(parent); |
1da177e4 LT |
2695 | |
2696 | sendresp: | |
aca3192c YH |
2697 | rsp.scid = cpu_to_le16(scid); |
2698 | rsp.dcid = cpu_to_le16(dcid); | |
2699 | rsp.result = cpu_to_le16(result); | |
2700 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2701 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2702 | |
2703 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2704 | struct l2cap_info_req info; | |
2705 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2706 | ||
2707 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2708 | conn->info_ident = l2cap_get_ident(conn); | |
2709 | ||
f878fcad | 2710 | schedule_delayed_work(&conn->info_work, |
79d554a6 MH |
2711 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
2712 | ||
2713 | l2cap_send_cmd(conn, conn->info_ident, | |
2714 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2715 | } | |
2716 | ||
c1360a1c | 2717 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2718 | result == L2CAP_CR_SUCCESS) { |
2719 | u8 buf[128]; | |
c1360a1c | 2720 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2721 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2722 | l2cap_build_conf_req(chan, buf), buf); |
2723 | chan->num_conf_req++; | |
e9aeb2dd GP |
2724 | } |
2725 | ||
1da177e4 LT |
2726 | return 0; |
2727 | } | |
2728 | ||
2729 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2730 | { | |
2731 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2732 | u16 scid, dcid, result, status; | |
48454079 | 2733 | struct l2cap_chan *chan; |
1da177e4 LT |
2734 | struct sock *sk; |
2735 | u8 req[128]; | |
2736 | ||
2737 | scid = __le16_to_cpu(rsp->scid); | |
2738 | dcid = __le16_to_cpu(rsp->dcid); | |
2739 | result = __le16_to_cpu(rsp->result); | |
2740 | status = __le16_to_cpu(rsp->status); | |
2741 | ||
2742 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2743 | ||
2744 | if (scid) { | |
baa7e1fa | 2745 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2746 | if (!chan) |
57d3b22b | 2747 | return -EFAULT; |
1da177e4 | 2748 | } else { |
baa7e1fa | 2749 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2750 | if (!chan) |
57d3b22b | 2751 | return -EFAULT; |
1da177e4 LT |
2752 | } |
2753 | ||
48454079 GP |
2754 | sk = chan->sk; |
2755 | ||
1da177e4 LT |
2756 | switch (result) { |
2757 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2758 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2759 | chan->ident = 0; |
fe4128e0 | 2760 | chan->dcid = dcid; |
c1360a1c | 2761 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2762 | |
c1360a1c | 2763 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2764 | break; |
2765 | ||
1da177e4 | 2766 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2767 | l2cap_build_conf_req(chan, req), req); |
2768 | chan->num_conf_req++; | |
1da177e4 LT |
2769 | break; |
2770 | ||
2771 | case L2CAP_CR_PEND: | |
c1360a1c | 2772 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2773 | break; |
2774 | ||
2775 | default: | |
48454079 | 2776 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2777 | break; |
2778 | } | |
2779 | ||
aa2ac881 | 2780 | release_sock(sk); |
1da177e4 LT |
2781 | return 0; |
2782 | } | |
2783 | ||
47d1ec61 | 2784 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2785 | { |
2786 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2787 | * sides request it. | |
2788 | */ | |
0c1bc5c6 | 2789 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2790 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2791 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2792 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2793 | } |
2794 | ||
88219a0f | 2795 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2796 | { |
2797 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2798 | u16 dcid, flags; | |
2799 | u8 rsp[64]; | |
48454079 | 2800 | struct l2cap_chan *chan; |
1da177e4 | 2801 | struct sock *sk; |
5dee9e7c | 2802 | int len; |
1da177e4 LT |
2803 | |
2804 | dcid = __le16_to_cpu(req->dcid); | |
2805 | flags = __le16_to_cpu(req->flags); | |
2806 | ||
2807 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2808 | ||
baa7e1fa | 2809 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2810 | if (!chan) |
1da177e4 LT |
2811 | return -ENOENT; |
2812 | ||
48454079 GP |
2813 | sk = chan->sk; |
2814 | ||
033b1142 | 2815 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2816 | struct l2cap_cmd_rej_cid rej; |
2817 | ||
2818 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2819 | rej.scid = cpu_to_le16(chan->scid); | |
2820 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2821 | |
df6bd743 GP |
2822 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2823 | sizeof(rej), &rej); | |
354f60a9 | 2824 | goto unlock; |
df6bd743 | 2825 | } |
354f60a9 | 2826 | |
5dee9e7c | 2827 | /* Reject if config buffer is too small. */ |
88219a0f | 2828 | len = cmd_len - sizeof(*req); |
7ac28817 | 2829 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2830 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2831 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2832 | L2CAP_CONF_REJECT, flags), rsp); |
2833 | goto unlock; | |
2834 | } | |
2835 | ||
2836 | /* Store config. */ | |
73ffa904 GP |
2837 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2838 | chan->conf_len += len; | |
1da177e4 LT |
2839 | |
2840 | if (flags & 0x0001) { | |
2841 | /* Incomplete config. Send empty response. */ | |
2842 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2843 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2844 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2845 | goto unlock; |
2846 | } | |
2847 | ||
2848 | /* Complete config. */ | |
73ffa904 | 2849 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2850 | if (len < 0) { |
e92c8e70 | 2851 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2852 | goto unlock; |
f2fcfcd6 | 2853 | } |
1da177e4 | 2854 | |
5dee9e7c | 2855 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2856 | chan->num_conf_rsp++; |
5dee9e7c | 2857 | |
5dee9e7c | 2858 | /* Reset config buffer. */ |
73ffa904 | 2859 | chan->conf_len = 0; |
5dee9e7c | 2860 | |
c1360a1c | 2861 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2862 | goto unlock; |
2863 | ||
c1360a1c | 2864 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2865 | set_default_fcs(chan); |
fcc203c3 | 2866 | |
89bc500e | 2867 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2868 | |
42e5c802 GP |
2869 | chan->next_tx_seq = 0; |
2870 | chan->expected_tx_seq = 0; | |
58d35f87 | 2871 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2872 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2873 | l2cap_ertm_init(chan); |
0565c1c2 | 2874 | |
1da177e4 | 2875 | l2cap_chan_ready(sk); |
876d9484 MH |
2876 | goto unlock; |
2877 | } | |
2878 | ||
c1360a1c | 2879 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2880 | u8 buf[64]; |
1da177e4 | 2881 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2882 | l2cap_build_conf_req(chan, buf), buf); |
2883 | chan->num_conf_req++; | |
1da177e4 LT |
2884 | } |
2885 | ||
0e8b207e AE |
2886 | /* Got Conf Rsp PENDING from remote side and asume we sent |
2887 | Conf Rsp PENDING in the code above */ | |
2888 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
2889 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2890 | ||
2891 | /* check compatibility */ | |
2892 | ||
2893 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2894 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2895 | ||
2896 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2897 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
2898 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
2899 | } | |
2900 | ||
1da177e4 | 2901 | unlock: |
aa2ac881 | 2902 | release_sock(sk); |
1da177e4 LT |
2903 | return 0; |
2904 | } | |
2905 | ||
2906 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2907 | { | |
2908 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2909 | u16 scid, flags, result; | |
48454079 | 2910 | struct l2cap_chan *chan; |
1da177e4 | 2911 | struct sock *sk; |
7b1c0049 | 2912 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2913 | |
2914 | scid = __le16_to_cpu(rsp->scid); | |
2915 | flags = __le16_to_cpu(rsp->flags); | |
2916 | result = __le16_to_cpu(rsp->result); | |
2917 | ||
af05b30b GP |
2918 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2919 | scid, flags, result); | |
1da177e4 | 2920 | |
baa7e1fa | 2921 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2922 | if (!chan) |
1da177e4 LT |
2923 | return 0; |
2924 | ||
48454079 GP |
2925 | sk = chan->sk; |
2926 | ||
1da177e4 LT |
2927 | switch (result) { |
2928 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2929 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 2930 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
2931 | break; |
2932 | ||
0e8b207e AE |
2933 | case L2CAP_CONF_PENDING: |
2934 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
2935 | ||
2936 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2937 | char buf[64]; | |
2938 | ||
2939 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2940 | buf, &result); | |
2941 | if (len < 0) { | |
2942 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
2943 | goto done; | |
2944 | } | |
2945 | ||
2946 | /* check compatibility */ | |
2947 | ||
2948 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2949 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2950 | ||
2951 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2952 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
2953 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
2954 | } | |
2955 | goto done; | |
2956 | ||
1da177e4 | 2957 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 2958 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2959 | char req[64]; |
2960 | ||
c2c77ec8 | 2961 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2962 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2963 | goto done; |
2964 | } | |
2965 | ||
f2fcfcd6 GP |
2966 | /* throw out any old stored conf requests */ |
2967 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2968 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2969 | req, &result); | |
f2fcfcd6 | 2970 | if (len < 0) { |
e92c8e70 | 2971 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2972 | goto done; |
2973 | } | |
2974 | ||
2975 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2976 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2977 | chan->num_conf_req++; |
f2fcfcd6 GP |
2978 | if (result != L2CAP_CONF_SUCCESS) |
2979 | goto done; | |
2980 | break; | |
1da177e4 LT |
2981 | } |
2982 | ||
8e87d142 | 2983 | default: |
b1235d79 | 2984 | sk->sk_err = ECONNRESET; |
f3f668b0 | 2985 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 2986 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2987 | goto done; |
2988 | } | |
2989 | ||
2990 | if (flags & 0x01) | |
2991 | goto done; | |
2992 | ||
c1360a1c | 2993 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2994 | |
c1360a1c | 2995 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2996 | set_default_fcs(chan); |
fcc203c3 | 2997 | |
89bc500e | 2998 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2999 | chan->next_tx_seq = 0; |
3000 | chan->expected_tx_seq = 0; | |
58d35f87 | 3001 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 3002 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 3003 | l2cap_ertm_init(chan); |
0565c1c2 | 3004 | |
1da177e4 LT |
3005 | l2cap_chan_ready(sk); |
3006 | } | |
3007 | ||
3008 | done: | |
aa2ac881 | 3009 | release_sock(sk); |
1da177e4 LT |
3010 | return 0; |
3011 | } | |
3012 | ||
3013 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3014 | { | |
3015 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3016 | struct l2cap_disconn_rsp rsp; | |
3017 | u16 dcid, scid; | |
48454079 | 3018 | struct l2cap_chan *chan; |
1da177e4 LT |
3019 | struct sock *sk; |
3020 | ||
3021 | scid = __le16_to_cpu(req->scid); | |
3022 | dcid = __le16_to_cpu(req->dcid); | |
3023 | ||
3024 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3025 | ||
baa7e1fa | 3026 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3027 | if (!chan) |
1da177e4 LT |
3028 | return 0; |
3029 | ||
48454079 GP |
3030 | sk = chan->sk; |
3031 | ||
fe4128e0 GP |
3032 | rsp.dcid = cpu_to_le16(chan->scid); |
3033 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3034 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3035 | ||
3036 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3037 | ||
48454079 | 3038 | l2cap_chan_del(chan, ECONNRESET); |
aa2ac881 | 3039 | release_sock(sk); |
1da177e4 | 3040 | |
ba3bd0ee | 3041 | chan->ops->close(chan->data); |
1da177e4 LT |
3042 | return 0; |
3043 | } | |
3044 | ||
3045 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3046 | { | |
3047 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3048 | u16 dcid, scid; | |
48454079 | 3049 | struct l2cap_chan *chan; |
1da177e4 LT |
3050 | struct sock *sk; |
3051 | ||
3052 | scid = __le16_to_cpu(rsp->scid); | |
3053 | dcid = __le16_to_cpu(rsp->dcid); | |
3054 | ||
3055 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3056 | ||
baa7e1fa | 3057 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3058 | if (!chan) |
1da177e4 LT |
3059 | return 0; |
3060 | ||
48454079 GP |
3061 | sk = chan->sk; |
3062 | ||
48454079 | 3063 | l2cap_chan_del(chan, 0); |
aa2ac881 | 3064 | release_sock(sk); |
1da177e4 | 3065 | |
ba3bd0ee | 3066 | chan->ops->close(chan->data); |
1da177e4 LT |
3067 | return 0; |
3068 | } | |
3069 | ||
3070 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3071 | { | |
3072 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3073 | u16 type; |
3074 | ||
3075 | type = __le16_to_cpu(req->type); | |
3076 | ||
3077 | BT_DBG("type 0x%4.4x", type); | |
3078 | ||
f0709e03 MH |
3079 | if (type == L2CAP_IT_FEAT_MASK) { |
3080 | u8 buf[8]; | |
44dd46de | 3081 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3082 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3083 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3084 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3085 | if (!disable_ertm) |
fcc203c3 GP |
3086 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3087 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3088 | if (enable_hs) |
6327eb98 AE |
3089 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3090 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3091 | |
1b7bf4ed | 3092 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3093 | l2cap_send_cmd(conn, cmd->ident, |
3094 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3095 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3096 | u8 buf[12]; | |
3097 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3098 | |
3099 | if (enable_hs) | |
3100 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3101 | else | |
3102 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3103 | ||
e1027a7c MH |
3104 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3105 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3106 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3107 | l2cap_send_cmd(conn, cmd->ident, |
3108 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3109 | } else { |
3110 | struct l2cap_info_rsp rsp; | |
3111 | rsp.type = cpu_to_le16(type); | |
3112 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3113 | l2cap_send_cmd(conn, cmd->ident, | |
3114 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3115 | } | |
1da177e4 LT |
3116 | |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3121 | { | |
3122 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3123 | u16 type, result; | |
3124 | ||
3125 | type = __le16_to_cpu(rsp->type); | |
3126 | result = __le16_to_cpu(rsp->result); | |
3127 | ||
3128 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3129 | ||
e90165be AE |
3130 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3131 | if (cmd->ident != conn->info_ident || | |
3132 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3133 | return 0; | |
3134 | ||
f878fcad | 3135 | cancel_delayed_work_sync(&conn->info_work); |
4e8402a3 | 3136 | |
adb08ede VT |
3137 | if (result != L2CAP_IR_SUCCESS) { |
3138 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3139 | conn->info_ident = 0; | |
3140 | ||
3141 | l2cap_conn_start(conn); | |
3142 | ||
3143 | return 0; | |
3144 | } | |
3145 | ||
984947dc | 3146 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3147 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3148 | |
47ec1dcd | 3149 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3150 | struct l2cap_info_req req; |
3151 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3152 | ||
3153 | conn->info_ident = l2cap_get_ident(conn); | |
3154 | ||
3155 | l2cap_send_cmd(conn, conn->info_ident, | |
3156 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3157 | } else { | |
3158 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3159 | conn->info_ident = 0; | |
3160 | ||
3161 | l2cap_conn_start(conn); | |
3162 | } | |
3163 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3164 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3165 | conn->info_ident = 0; |
984947dc MH |
3166 | |
3167 | l2cap_conn_start(conn); | |
3168 | } | |
4e8402a3 | 3169 | |
1da177e4 LT |
3170 | return 0; |
3171 | } | |
3172 | ||
f94ff6ff MM |
3173 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3174 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3175 | void *data) | |
3176 | { | |
3177 | struct l2cap_create_chan_req *req = data; | |
3178 | struct l2cap_create_chan_rsp rsp; | |
3179 | u16 psm, scid; | |
3180 | ||
3181 | if (cmd_len != sizeof(*req)) | |
3182 | return -EPROTO; | |
3183 | ||
3184 | if (!enable_hs) | |
3185 | return -EINVAL; | |
3186 | ||
3187 | psm = le16_to_cpu(req->psm); | |
3188 | scid = le16_to_cpu(req->scid); | |
3189 | ||
3190 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3191 | ||
3192 | /* Placeholder: Always reject */ | |
3193 | rsp.dcid = 0; | |
3194 | rsp.scid = cpu_to_le16(scid); | |
3195 | rsp.result = L2CAP_CR_NO_MEM; | |
3196 | rsp.status = L2CAP_CS_NO_INFO; | |
3197 | ||
3198 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3199 | sizeof(rsp), &rsp); | |
3200 | ||
3201 | return 0; | |
3202 | } | |
3203 | ||
3204 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3205 | struct l2cap_cmd_hdr *cmd, void *data) | |
3206 | { | |
3207 | BT_DBG("conn %p", conn); | |
3208 | ||
3209 | return l2cap_connect_rsp(conn, cmd, data); | |
3210 | } | |
3211 | ||
8d5a04a1 MM |
3212 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3213 | u16 icid, u16 result) | |
3214 | { | |
3215 | struct l2cap_move_chan_rsp rsp; | |
3216 | ||
3217 | BT_DBG("icid %d, result %d", icid, result); | |
3218 | ||
3219 | rsp.icid = cpu_to_le16(icid); | |
3220 | rsp.result = cpu_to_le16(result); | |
3221 | ||
3222 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3223 | } | |
3224 | ||
3225 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3226 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3227 | { | |
3228 | struct l2cap_move_chan_cfm cfm; | |
3229 | u8 ident; | |
3230 | ||
3231 | BT_DBG("icid %d, result %d", icid, result); | |
3232 | ||
3233 | ident = l2cap_get_ident(conn); | |
3234 | if (chan) | |
3235 | chan->ident = ident; | |
3236 | ||
3237 | cfm.icid = cpu_to_le16(icid); | |
3238 | cfm.result = cpu_to_le16(result); | |
3239 | ||
3240 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3241 | } | |
3242 | ||
3243 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3244 | u16 icid) | |
3245 | { | |
3246 | struct l2cap_move_chan_cfm_rsp rsp; | |
3247 | ||
3248 | BT_DBG("icid %d", icid); | |
3249 | ||
3250 | rsp.icid = cpu_to_le16(icid); | |
3251 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3252 | } | |
3253 | ||
3254 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3255 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3256 | { | |
3257 | struct l2cap_move_chan_req *req = data; | |
3258 | u16 icid = 0; | |
3259 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3260 | ||
3261 | if (cmd_len != sizeof(*req)) | |
3262 | return -EPROTO; | |
3263 | ||
3264 | icid = le16_to_cpu(req->icid); | |
3265 | ||
3266 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3267 | ||
3268 | if (!enable_hs) | |
3269 | return -EINVAL; | |
3270 | ||
3271 | /* Placeholder: Always refuse */ | |
3272 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3273 | ||
3274 | return 0; | |
3275 | } | |
3276 | ||
3277 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3278 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3279 | { | |
3280 | struct l2cap_move_chan_rsp *rsp = data; | |
3281 | u16 icid, result; | |
3282 | ||
3283 | if (cmd_len != sizeof(*rsp)) | |
3284 | return -EPROTO; | |
3285 | ||
3286 | icid = le16_to_cpu(rsp->icid); | |
3287 | result = le16_to_cpu(rsp->result); | |
3288 | ||
3289 | BT_DBG("icid %d, result %d", icid, result); | |
3290 | ||
3291 | /* Placeholder: Always unconfirmed */ | |
3292 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3293 | ||
3294 | return 0; | |
3295 | } | |
3296 | ||
3297 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3298 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3299 | { | |
3300 | struct l2cap_move_chan_cfm *cfm = data; | |
3301 | u16 icid, result; | |
3302 | ||
3303 | if (cmd_len != sizeof(*cfm)) | |
3304 | return -EPROTO; | |
3305 | ||
3306 | icid = le16_to_cpu(cfm->icid); | |
3307 | result = le16_to_cpu(cfm->result); | |
3308 | ||
3309 | BT_DBG("icid %d, result %d", icid, result); | |
3310 | ||
3311 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3312 | ||
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3317 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3318 | { | |
3319 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3320 | u16 icid; | |
3321 | ||
3322 | if (cmd_len != sizeof(*rsp)) | |
3323 | return -EPROTO; | |
3324 | ||
3325 | icid = le16_to_cpu(rsp->icid); | |
3326 | ||
3327 | BT_DBG("icid %d", icid); | |
3328 | ||
3329 | return 0; | |
3330 | } | |
3331 | ||
e2174ca4 | 3332 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3333 | u16 to_multiplier) |
3334 | { | |
3335 | u16 max_latency; | |
3336 | ||
3337 | if (min > max || min < 6 || max > 3200) | |
3338 | return -EINVAL; | |
3339 | ||
3340 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3341 | return -EINVAL; | |
3342 | ||
3343 | if (max >= to_multiplier * 8) | |
3344 | return -EINVAL; | |
3345 | ||
3346 | max_latency = (to_multiplier * 8 / max) - 1; | |
3347 | if (latency > 499 || latency > max_latency) | |
3348 | return -EINVAL; | |
3349 | ||
3350 | return 0; | |
3351 | } | |
3352 | ||
3353 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3354 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3355 | { | |
3356 | struct hci_conn *hcon = conn->hcon; | |
3357 | struct l2cap_conn_param_update_req *req; | |
3358 | struct l2cap_conn_param_update_rsp rsp; | |
3359 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3360 | int err; |
de73115a CT |
3361 | |
3362 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3363 | return -EINVAL; | |
3364 | ||
3365 | cmd_len = __le16_to_cpu(cmd->len); | |
3366 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3367 | return -EPROTO; | |
3368 | ||
3369 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3370 | min = __le16_to_cpu(req->min); |
3371 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3372 | latency = __le16_to_cpu(req->latency); |
3373 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3374 | ||
3375 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3376 | min, max, latency, to_multiplier); | |
3377 | ||
3378 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3379 | |
3380 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3381 | if (err) | |
de73115a CT |
3382 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3383 | else | |
3384 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3385 | ||
3386 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3387 | sizeof(rsp), &rsp); | |
3388 | ||
2ce603eb CT |
3389 | if (!err) |
3390 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3391 | ||
de73115a CT |
3392 | return 0; |
3393 | } | |
3394 | ||
3300d9a9 CT |
3395 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3396 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3397 | { | |
3398 | int err = 0; | |
3399 | ||
3400 | switch (cmd->code) { | |
3401 | case L2CAP_COMMAND_REJ: | |
3402 | l2cap_command_rej(conn, cmd, data); | |
3403 | break; | |
3404 | ||
3405 | case L2CAP_CONN_REQ: | |
3406 | err = l2cap_connect_req(conn, cmd, data); | |
3407 | break; | |
3408 | ||
3409 | case L2CAP_CONN_RSP: | |
3410 | err = l2cap_connect_rsp(conn, cmd, data); | |
3411 | break; | |
3412 | ||
3413 | case L2CAP_CONF_REQ: | |
3414 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3415 | break; | |
3416 | ||
3417 | case L2CAP_CONF_RSP: | |
3418 | err = l2cap_config_rsp(conn, cmd, data); | |
3419 | break; | |
3420 | ||
3421 | case L2CAP_DISCONN_REQ: | |
3422 | err = l2cap_disconnect_req(conn, cmd, data); | |
3423 | break; | |
3424 | ||
3425 | case L2CAP_DISCONN_RSP: | |
3426 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3427 | break; | |
3428 | ||
3429 | case L2CAP_ECHO_REQ: | |
3430 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3431 | break; | |
3432 | ||
3433 | case L2CAP_ECHO_RSP: | |
3434 | break; | |
3435 | ||
3436 | case L2CAP_INFO_REQ: | |
3437 | err = l2cap_information_req(conn, cmd, data); | |
3438 | break; | |
3439 | ||
3440 | case L2CAP_INFO_RSP: | |
3441 | err = l2cap_information_rsp(conn, cmd, data); | |
3442 | break; | |
3443 | ||
f94ff6ff MM |
3444 | case L2CAP_CREATE_CHAN_REQ: |
3445 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3446 | break; | |
3447 | ||
3448 | case L2CAP_CREATE_CHAN_RSP: | |
3449 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3450 | break; | |
3451 | ||
8d5a04a1 MM |
3452 | case L2CAP_MOVE_CHAN_REQ: |
3453 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3454 | break; | |
3455 | ||
3456 | case L2CAP_MOVE_CHAN_RSP: | |
3457 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3458 | break; | |
3459 | ||
3460 | case L2CAP_MOVE_CHAN_CFM: | |
3461 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3462 | break; | |
3463 | ||
3464 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3465 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3466 | break; | |
3467 | ||
3300d9a9 CT |
3468 | default: |
3469 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3470 | err = -EINVAL; | |
3471 | break; | |
3472 | } | |
3473 | ||
3474 | return err; | |
3475 | } | |
3476 | ||
3477 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3478 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3479 | { | |
3480 | switch (cmd->code) { | |
3481 | case L2CAP_COMMAND_REJ: | |
3482 | return 0; | |
3483 | ||
3484 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3485 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3486 | |
3487 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3488 | return 0; | |
3489 | ||
3490 | default: | |
3491 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3492 | return -EINVAL; | |
3493 | } | |
3494 | } | |
3495 | ||
3496 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3497 | struct sk_buff *skb) | |
1da177e4 LT |
3498 | { |
3499 | u8 *data = skb->data; | |
3500 | int len = skb->len; | |
3501 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3502 | int err; |
1da177e4 LT |
3503 | |
3504 | l2cap_raw_recv(conn, skb); | |
3505 | ||
3506 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3507 | u16 cmd_len; |
1da177e4 LT |
3508 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3509 | data += L2CAP_CMD_HDR_SIZE; | |
3510 | len -= L2CAP_CMD_HDR_SIZE; | |
3511 | ||
88219a0f | 3512 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3513 | |
88219a0f | 3514 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3515 | |
88219a0f | 3516 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3517 | BT_DBG("corrupted command"); |
3518 | break; | |
3519 | } | |
3520 | ||
3300d9a9 CT |
3521 | if (conn->hcon->type == LE_LINK) |
3522 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3523 | else | |
3524 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3525 | |
3526 | if (err) { | |
e2fd318e | 3527 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3528 | |
3529 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3530 | |
3531 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3532 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3533 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3534 | } | |
3535 | ||
88219a0f AV |
3536 | data += cmd_len; |
3537 | len -= cmd_len; | |
1da177e4 LT |
3538 | } |
3539 | ||
3540 | kfree_skb(skb); | |
3541 | } | |
3542 | ||
47d1ec61 | 3543 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3544 | { |
3545 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3546 | int hdr_size; |
3547 | ||
3548 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3549 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3550 | else | |
3551 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3552 | |
47d1ec61 | 3553 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3554 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3555 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3556 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3557 | ||
3558 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3559 | return -EBADMSG; |
fcc203c3 GP |
3560 | } |
3561 | return 0; | |
3562 | } | |
3563 | ||
525cd185 | 3564 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3565 | { |
88843ab0 | 3566 | u32 control = 0; |
d5392c8f | 3567 | |
6a026610 | 3568 | chan->frames_sent = 0; |
d5392c8f | 3569 | |
0b209fae | 3570 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3571 | |
e2ab4353 | 3572 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3573 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3574 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3575 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3576 | } |
3577 | ||
e2ab4353 | 3578 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3579 | l2cap_retransmit_frames(chan); |
d5392c8f | 3580 | |
525cd185 | 3581 | l2cap_ertm_send(chan); |
d5392c8f | 3582 | |
e2ab4353 | 3583 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3584 | chan->frames_sent == 0) { |
ab784b73 | 3585 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3586 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3587 | } |
3588 | } | |
3589 | ||
fb45de7d | 3590 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3591 | { |
3592 | struct sk_buff *next_skb; | |
bfbacc11 | 3593 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3594 | |
3595 | bt_cb(skb)->tx_seq = tx_seq; | |
3596 | bt_cb(skb)->sar = sar; | |
3597 | ||
f1c6775b | 3598 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3599 | |
836be934 | 3600 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 3601 | |
039d9572 | 3602 | while (next_skb) { |
9b53350d JPRV |
3603 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3604 | return -EINVAL; | |
3605 | ||
836be934 AE |
3606 | next_tx_seq_offset = __seq_offset(chan, |
3607 | bt_cb(next_skb)->tx_seq, chan->buffer_seq); | |
bfbacc11 JPRV |
3608 | |
3609 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3610 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3611 | return 0; |
8f17154f GP |
3612 | } |
3613 | ||
f1c6775b | 3614 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
3615 | next_skb = NULL; |
3616 | else | |
3617 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
3618 | } | |
8f17154f | 3619 | |
f1c6775b | 3620 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3621 | |
3622 | return 0; | |
8f17154f GP |
3623 | } |
3624 | ||
84084a31 MM |
3625 | static void append_skb_frag(struct sk_buff *skb, |
3626 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3627 | { |
84084a31 MM |
3628 | /* skb->len reflects data in skb as well as all fragments |
3629 | * skb->data_len reflects only data in fragments | |
3630 | */ | |
3631 | if (!skb_has_frag_list(skb)) | |
3632 | skb_shinfo(skb)->frag_list = new_frag; | |
3633 | ||
3634 | new_frag->next = NULL; | |
3635 | ||
3636 | (*last_frag)->next = new_frag; | |
3637 | *last_frag = new_frag; | |
3638 | ||
3639 | skb->len += new_frag->len; | |
3640 | skb->data_len += new_frag->len; | |
3641 | skb->truesize += new_frag->truesize; | |
3642 | } | |
3643 | ||
88843ab0 | 3644 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
3645 | { |
3646 | int err = -EINVAL; | |
18778a63 | 3647 | |
7e0ef6ee AE |
3648 | switch (__get_ctrl_sar(chan, control)) { |
3649 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3650 | if (chan->sdu) |
3651 | break; | |
18778a63 | 3652 | |
84084a31 MM |
3653 | err = chan->ops->recv(chan->data, skb); |
3654 | break; | |
18778a63 | 3655 | |
7e0ef6ee | 3656 | case L2CAP_SAR_START: |
84084a31 MM |
3657 | if (chan->sdu) |
3658 | break; | |
18778a63 | 3659 | |
6f61fd47 | 3660 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 3661 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 3662 | |
84084a31 MM |
3663 | if (chan->sdu_len > chan->imtu) { |
3664 | err = -EMSGSIZE; | |
3665 | break; | |
3666 | } | |
1890d36b | 3667 | |
84084a31 MM |
3668 | if (skb->len >= chan->sdu_len) |
3669 | break; | |
18778a63 | 3670 | |
84084a31 MM |
3671 | chan->sdu = skb; |
3672 | chan->sdu_last_frag = skb; | |
18778a63 | 3673 | |
84084a31 MM |
3674 | skb = NULL; |
3675 | err = 0; | |
18778a63 GP |
3676 | break; |
3677 | ||
7e0ef6ee | 3678 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3679 | if (!chan->sdu) |
84084a31 | 3680 | break; |
18778a63 | 3681 | |
84084a31 MM |
3682 | append_skb_frag(chan->sdu, skb, |
3683 | &chan->sdu_last_frag); | |
3684 | skb = NULL; | |
18778a63 | 3685 | |
84084a31 MM |
3686 | if (chan->sdu->len >= chan->sdu_len) |
3687 | break; | |
4178ba46 | 3688 | |
84084a31 | 3689 | err = 0; |
18778a63 GP |
3690 | break; |
3691 | ||
7e0ef6ee | 3692 | case L2CAP_SAR_END: |
6f61fd47 | 3693 | if (!chan->sdu) |
84084a31 | 3694 | break; |
18778a63 | 3695 | |
84084a31 MM |
3696 | append_skb_frag(chan->sdu, skb, |
3697 | &chan->sdu_last_frag); | |
3698 | skb = NULL; | |
4178ba46 | 3699 | |
84084a31 MM |
3700 | if (chan->sdu->len != chan->sdu_len) |
3701 | break; | |
18778a63 | 3702 | |
84084a31 | 3703 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3704 | |
84084a31 MM |
3705 | if (!err) { |
3706 | /* Reassembly complete */ | |
3707 | chan->sdu = NULL; | |
3708 | chan->sdu_last_frag = NULL; | |
3709 | chan->sdu_len = 0; | |
1890d36b | 3710 | } |
18778a63 GP |
3711 | break; |
3712 | } | |
3713 | ||
84084a31 MM |
3714 | if (err) { |
3715 | kfree_skb(skb); | |
3716 | kfree_skb(chan->sdu); | |
3717 | chan->sdu = NULL; | |
3718 | chan->sdu_last_frag = NULL; | |
3719 | chan->sdu_len = 0; | |
3720 | } | |
18778a63 | 3721 | |
84084a31 | 3722 | return err; |
18778a63 GP |
3723 | } |
3724 | ||
26f880d2 | 3725 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3726 | { |
88843ab0 | 3727 | u32 control; |
712132eb | 3728 | |
26f880d2 | 3729 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3730 | |
26f880d2 MM |
3731 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3732 | ||
0b209fae | 3733 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 | 3734 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
26f880d2 MM |
3735 | l2cap_send_sframe(chan, control); |
3736 | ||
3737 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3738 | ||
3739 | __clear_ack_timer(chan); | |
3740 | } | |
3741 | ||
3742 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3743 | { | |
88843ab0 | 3744 | u32 control; |
712132eb | 3745 | |
e2ab4353 | 3746 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3747 | goto done; |
3748 | ||
0b209fae | 3749 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 3750 | control |= __set_ctrl_poll(chan); |
ab784b73 | 3751 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3752 | l2cap_send_sframe(chan, control); |
6a026610 | 3753 | chan->retry_count = 1; |
712132eb | 3754 | |
1a09bcb9 GP |
3755 | __clear_retrans_timer(chan); |
3756 | __set_monitor_timer(chan); | |
712132eb | 3757 | |
e2ab4353 | 3758 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3759 | |
3760 | done: | |
e2ab4353 GP |
3761 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3762 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3763 | |
49208c9c | 3764 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3765 | } |
3766 | ||
e328140f | 3767 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3768 | { |
e328140f MM |
3769 | if (chan->mode == L2CAP_MODE_ERTM) { |
3770 | if (busy) | |
3771 | l2cap_ertm_enter_local_busy(chan); | |
3772 | else | |
3773 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3774 | } |
1890d36b GP |
3775 | } |
3776 | ||
fb45de7d | 3777 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3778 | { |
3779 | struct sk_buff *skb; | |
88843ab0 | 3780 | u32 control; |
8f17154f | 3781 | |
e328140f MM |
3782 | while ((skb = skb_peek(&chan->srej_q)) && |
3783 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3784 | int err; | |
3785 | ||
8f17154f GP |
3786 | if (bt_cb(skb)->tx_seq != tx_seq) |
3787 | break; | |
3788 | ||
f1c6775b | 3789 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3790 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3791 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3792 | |
3793 | if (err < 0) { | |
3794 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3795 | break; | |
3796 | } | |
3797 | ||
836be934 AE |
3798 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
3799 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
3800 | } |
3801 | } | |
3802 | ||
fb45de7d | 3803 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3804 | { |
8f17154f | 3805 | struct srej_list *l, *tmp; |
88843ab0 | 3806 | u32 control; |
8f17154f | 3807 | |
39d5a3ee | 3808 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3809 | if (l->tx_seq == tx_seq) { |
3810 | list_del(&l->list); | |
3811 | kfree(l); | |
3812 | return; | |
3813 | } | |
ab784b73 | 3814 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3815 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3816 | l2cap_send_sframe(chan, control); |
8f17154f | 3817 | list_del(&l->list); |
39d5a3ee | 3818 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3819 | } |
3820 | } | |
3821 | ||
aef89f21 | 3822 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3823 | { |
8f17154f | 3824 | struct srej_list *new; |
88843ab0 | 3825 | u32 control; |
8f17154f | 3826 | |
42e5c802 | 3827 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3828 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3829 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3830 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3831 | |
3832 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
3833 | if (!new) |
3834 | return -ENOMEM; | |
3835 | ||
42e5c802 | 3836 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
3837 | |
3838 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
3839 | ||
39d5a3ee | 3840 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3841 | } |
836be934 AE |
3842 | |
3843 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
3844 | |
3845 | return 0; | |
8f17154f GP |
3846 | } |
3847 | ||
88843ab0 | 3848 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 3849 | { |
fb45de7d | 3850 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3851 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3852 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3853 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3854 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3855 | int err = 0; |
3856 | ||
88843ab0 | 3857 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 3858 | tx_seq, rx_control); |
1c2acffb | 3859 | |
03f6715d | 3860 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 3861 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3862 | __clear_monitor_timer(chan); |
6a026610 | 3863 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3864 | __set_retrans_timer(chan); |
e2ab4353 | 3865 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3866 | } |
3867 | ||
42e5c802 GP |
3868 | chan->expected_ack_seq = req_seq; |
3869 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3870 | |
836be934 | 3871 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
3872 | |
3873 | /* invalid tx_seq */ | |
47d1ec61 | 3874 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3875 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3876 | goto drop; |
3877 | } | |
3878 | ||
e2ab4353 | 3879 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3880 | goto drop; |
3881 | ||
02f1b641 MM |
3882 | if (tx_seq == chan->expected_tx_seq) |
3883 | goto expected; | |
3884 | ||
e2ab4353 | 3885 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3886 | struct srej_list *first; |
30afb5b2 | 3887 | |
39d5a3ee | 3888 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3889 | struct srej_list, list); |
3890 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3891 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3892 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3893 | |
3894 | list_del(&first->list); | |
3895 | kfree(first); | |
3896 | ||
39d5a3ee | 3897 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3898 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3899 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3900 | l2cap_send_ack(chan); |
49208c9c | 3901 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3902 | } |
3903 | } else { | |
3904 | struct srej_list *l; | |
9b53350d JPRV |
3905 | |
3906 | /* duplicated tx_seq */ | |
42e5c802 | 3907 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3908 | goto drop; |
8f17154f | 3909 | |
39d5a3ee | 3910 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3911 | if (l->tx_seq == tx_seq) { |
525cd185 | 3912 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3913 | return 0; |
3914 | } | |
3915 | } | |
aef89f21 SJ |
3916 | |
3917 | err = l2cap_send_srejframe(chan, tx_seq); | |
3918 | if (err < 0) { | |
3919 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3920 | return err; | |
3921 | } | |
30afb5b2 GP |
3922 | } |
3923 | } else { | |
836be934 AE |
3924 | expected_tx_seq_offset = __seq_offset(chan, |
3925 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
3926 | |
3927 | /* duplicated tx_seq */ | |
3928 | if (tx_seq_offset < expected_tx_seq_offset) | |
3929 | goto drop; | |
3930 | ||
e2ab4353 | 3931 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3932 | |
49208c9c | 3933 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3934 | |
39d5a3ee | 3935 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3936 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3937 | |
f1c6775b | 3938 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3939 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3940 | |
e2ab4353 | 3941 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3942 | |
aef89f21 SJ |
3943 | err = l2cap_send_srejframe(chan, tx_seq); |
3944 | if (err < 0) { | |
3945 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3946 | return err; | |
3947 | } | |
7fe9b298 | 3948 | |
1a09bcb9 | 3949 | __clear_ack_timer(chan); |
1c2acffb | 3950 | } |
30afb5b2 GP |
3951 | return 0; |
3952 | ||
8f17154f | 3953 | expected: |
836be934 | 3954 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 3955 | |
e2ab4353 | 3956 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3957 | bt_cb(skb)->tx_seq = tx_seq; |
3958 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3959 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3960 | return 0; |
3961 | } | |
3962 | ||
84084a31 | 3963 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
3964 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
3965 | ||
e328140f MM |
3966 | if (err < 0) { |
3967 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3968 | return err; | |
3969 | } | |
2ece3684 | 3970 | |
03f6715d | 3971 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3972 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3973 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3974 | } |
3975 | ||
c1b4f43b | 3976 | |
6a026610 GP |
3977 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3978 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3979 | l2cap_send_ack(chan); |
4d611e4d GP |
3980 | else |
3981 | __set_ack_timer(chan); | |
9e917af1 | 3982 | |
8f17154f | 3983 | return 0; |
9b53350d JPRV |
3984 | |
3985 | drop: | |
3986 | kfree_skb(skb); | |
3987 | return 0; | |
1c2acffb GP |
3988 | } |
3989 | ||
88843ab0 | 3990 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 3991 | { |
88843ab0 | 3992 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 3993 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 3994 | |
0b209fae | 3995 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 3996 | l2cap_drop_acked_frames(chan); |
1c2acffb | 3997 | |
e3781735 | 3998 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
3999 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
4000 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
4001 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 4002 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4003 | __set_retrans_timer(chan); |
05fbd89d | 4004 | |
e2ab4353 | 4005 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4006 | l2cap_send_srejtail(chan); |
05fbd89d | 4007 | } else { |
525cd185 | 4008 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4009 | } |
1d8f5d16 | 4010 | |
03f6715d | 4011 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4012 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4013 | |
e2ab4353 | 4014 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4015 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4016 | |
e072745f | 4017 | } else { |
e2ab4353 | 4018 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4019 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4020 | __set_retrans_timer(chan); |
1c2acffb | 4021 | |
e2ab4353 GP |
4022 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4023 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4024 | l2cap_send_ack(chan); |
894718a6 | 4025 | else |
525cd185 | 4026 | l2cap_ertm_send(chan); |
e072745f GP |
4027 | } |
4028 | } | |
2246b2f1 | 4029 | |
88843ab0 | 4030 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4031 | { |
0b209fae | 4032 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4033 | |
88843ab0 | 4034 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4035 | |
e2ab4353 | 4036 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4037 | |
42e5c802 GP |
4038 | chan->expected_ack_seq = tx_seq; |
4039 | l2cap_drop_acked_frames(chan); | |
e072745f | 4040 | |
03f6715d | 4041 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4042 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4043 | l2cap_retransmit_frames(chan); |
e072745f | 4044 | } else { |
525cd185 | 4045 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4046 | |
e2ab4353 GP |
4047 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4048 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4049 | } |
4050 | } | |
88843ab0 | 4051 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4052 | { |
0b209fae | 4053 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4054 | |
88843ab0 | 4055 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4056 | |
e2ab4353 | 4057 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4058 | |
e3781735 | 4059 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4060 | chan->expected_ack_seq = tx_seq; |
4061 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4062 | |
e2ab4353 | 4063 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4064 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4065 | |
525cd185 | 4066 | l2cap_ertm_send(chan); |
dfc909be | 4067 | |
e2ab4353 | 4068 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4069 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4070 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4071 | } |
03f6715d | 4072 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4073 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4074 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4075 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4076 | else |
525cd185 | 4077 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4078 | } else { |
525cd185 | 4079 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4080 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4081 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4082 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4083 | } |
e072745f GP |
4084 | } |
4085 | } | |
4086 | ||
88843ab0 | 4087 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4088 | { |
0b209fae | 4089 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4090 | |
88843ab0 | 4091 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4092 | |
e2ab4353 | 4093 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4094 | chan->expected_ack_seq = tx_seq; |
4095 | l2cap_drop_acked_frames(chan); | |
e072745f | 4096 | |
e3781735 | 4097 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4098 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4099 | |
e2ab4353 | 4100 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4101 | __clear_retrans_timer(chan); |
e3781735 | 4102 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4103 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4104 | return; |
e072745f | 4105 | } |
99b0d4b7 | 4106 | |
e3781735 | 4107 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4108 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4109 | } else { |
4110 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4111 | l2cap_send_sframe(chan, rx_control); | |
4112 | } | |
e072745f GP |
4113 | } |
4114 | ||
88843ab0 | 4115 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4116 | { |
88843ab0 | 4117 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4118 | |
03f6715d | 4119 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4120 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4121 | __clear_monitor_timer(chan); |
6a026610 | 4122 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4123 | __set_retrans_timer(chan); |
e2ab4353 | 4124 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4125 | } |
4126 | ||
ab784b73 AE |
4127 | switch (__get_ctrl_super(chan, rx_control)) { |
4128 | case L2CAP_SUPER_RR: | |
525cd185 | 4129 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4130 | break; |
4131 | ||
ab784b73 | 4132 | case L2CAP_SUPER_REJ: |
525cd185 | 4133 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4134 | break; |
2246b2f1 | 4135 | |
ab784b73 | 4136 | case L2CAP_SUPER_SREJ: |
525cd185 | 4137 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4138 | break; |
4139 | ||
ab784b73 | 4140 | case L2CAP_SUPER_RNR: |
525cd185 | 4141 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4142 | break; |
4143 | } | |
4144 | ||
faaebd19 | 4145 | kfree_skb(skb); |
1c2acffb GP |
4146 | return 0; |
4147 | } | |
4148 | ||
218bb9df GP |
4149 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4150 | { | |
525cd185 | 4151 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
88843ab0 | 4152 | u32 control; |
0b209fae | 4153 | u16 req_seq; |
218bb9df GP |
4154 | int len, next_tx_seq_offset, req_seq_offset; |
4155 | ||
88843ab0 AE |
4156 | control = __get_control(chan, skb->data); |
4157 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4158 | len = skb->len; |
4159 | ||
4160 | /* | |
4161 | * We can just drop the corrupted I-frame here. | |
4162 | * Receiver will miss it and start proper recovery | |
4163 | * procedures and ask retransmission. | |
4164 | */ | |
47d1ec61 | 4165 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4166 | goto drop; |
4167 | ||
793c2f1c | 4168 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4169 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4170 | |
47d1ec61 | 4171 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4172 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4173 | |
47d1ec61 | 4174 | if (len > chan->mps) { |
8c1d787b | 4175 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4176 | goto drop; |
4177 | } | |
4178 | ||
0b209fae | 4179 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4180 | |
836be934 AE |
4181 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4182 | ||
4183 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4184 | chan->expected_ack_seq); | |
218bb9df GP |
4185 | |
4186 | /* check for invalid req-seq */ | |
4187 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4188 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4189 | goto drop; |
4190 | } | |
4191 | ||
793c2f1c | 4192 | if (!__is_sframe(chan, control)) { |
218bb9df | 4193 | if (len < 0) { |
8c1d787b | 4194 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4195 | goto drop; |
4196 | } | |
4197 | ||
525cd185 | 4198 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4199 | } else { |
4200 | if (len != 0) { | |
4201 | BT_ERR("%d", len); | |
8c1d787b | 4202 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4203 | goto drop; |
4204 | } | |
4205 | ||
525cd185 | 4206 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4207 | } |
4208 | ||
4209 | return 0; | |
4210 | ||
4211 | drop: | |
4212 | kfree_skb(skb); | |
4213 | return 0; | |
4214 | } | |
4215 | ||
1da177e4 LT |
4216 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4217 | { | |
48454079 | 4218 | struct l2cap_chan *chan; |
bf734843 | 4219 | struct sock *sk = NULL; |
88843ab0 | 4220 | u32 control; |
fb45de7d | 4221 | u16 tx_seq; |
218bb9df | 4222 | int len; |
1da177e4 | 4223 | |
baa7e1fa | 4224 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4225 | if (!chan) { |
1da177e4 LT |
4226 | BT_DBG("unknown cid 0x%4.4x", cid); |
4227 | goto drop; | |
4228 | } | |
4229 | ||
48454079 | 4230 | sk = chan->sk; |
6840ed07 | 4231 | |
49208c9c | 4232 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4233 | |
89bc500e | 4234 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4235 | goto drop; |
4236 | ||
0c1bc5c6 | 4237 | switch (chan->mode) { |
1c2acffb GP |
4238 | case L2CAP_MODE_BASIC: |
4239 | /* If socket recv buffers overflows we drop data here | |
4240 | * which is *bad* because L2CAP has to be reliable. | |
4241 | * But we don't have any other choice. L2CAP doesn't | |
4242 | * provide flow control mechanism. */ | |
1da177e4 | 4243 | |
0c1bc5c6 | 4244 | if (chan->imtu < skb->len) |
1c2acffb | 4245 | goto drop; |
1da177e4 | 4246 | |
23070494 | 4247 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4248 | goto done; |
4249 | break; | |
4250 | ||
4251 | case L2CAP_MODE_ERTM: | |
eb403a1b | 4252 | l2cap_ertm_data_rcv(sk, skb); |
1c2acffb | 4253 | |
fcafde2e | 4254 | goto done; |
1c2acffb | 4255 | |
6840ed07 | 4256 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4257 | control = __get_control(chan, skb->data); |
4258 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4259 | len = skb->len; |
4260 | ||
47d1ec61 | 4261 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4262 | goto drop; |
4263 | ||
7e0ef6ee | 4264 | if (__is_sar_start(chan, control)) |
03a51213 | 4265 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4266 | |
47d1ec61 | 4267 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4268 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4269 | |
793c2f1c | 4270 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4271 | goto drop; |
4272 | ||
fb45de7d | 4273 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4274 | |
84084a31 MM |
4275 | if (chan->expected_tx_seq != tx_seq) { |
4276 | /* Frame(s) missing - must discard partial SDU */ | |
4277 | kfree_skb(chan->sdu); | |
4278 | chan->sdu = NULL; | |
4279 | chan->sdu_last_frag = NULL; | |
4280 | chan->sdu_len = 0; | |
6840ed07 | 4281 | |
84084a31 MM |
4282 | /* TODO: Notify userland of missing data */ |
4283 | } | |
4284 | ||
836be934 | 4285 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4286 | |
4287 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4288 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4289 | |
4290 | goto done; | |
4291 | ||
1c2acffb | 4292 | default: |
0c1bc5c6 | 4293 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4294 | break; |
4295 | } | |
1da177e4 LT |
4296 | |
4297 | drop: | |
4298 | kfree_skb(skb); | |
4299 | ||
4300 | done: | |
0139418c | 4301 | if (sk) |
aa2ac881 | 4302 | release_sock(sk); |
0139418c | 4303 | |
1da177e4 LT |
4304 | return 0; |
4305 | } | |
4306 | ||
8e036fc3 | 4307 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4308 | { |
6dcae1ea | 4309 | struct sock *sk = NULL; |
23691d75 | 4310 | struct l2cap_chan *chan; |
1da177e4 | 4311 | |
23691d75 GP |
4312 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
4313 | if (!chan) | |
1da177e4 LT |
4314 | goto drop; |
4315 | ||
23691d75 GP |
4316 | sk = chan->sk; |
4317 | ||
aa2ac881 | 4318 | lock_sock(sk); |
e0f0cb56 | 4319 | |
1da177e4 LT |
4320 | BT_DBG("sk %p, len %d", sk, skb->len); |
4321 | ||
89bc500e | 4322 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4323 | goto drop; |
4324 | ||
e13e21dc | 4325 | if (chan->imtu < skb->len) |
1da177e4 LT |
4326 | goto drop; |
4327 | ||
23070494 | 4328 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
4329 | goto done; |
4330 | ||
4331 | drop: | |
4332 | kfree_skb(skb); | |
4333 | ||
4334 | done: | |
af05b30b | 4335 | if (sk) |
aa2ac881 | 4336 | release_sock(sk); |
1da177e4 LT |
4337 | return 0; |
4338 | } | |
4339 | ||
9f69bda6 GP |
4340 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
4341 | { | |
6dcae1ea | 4342 | struct sock *sk = NULL; |
23691d75 | 4343 | struct l2cap_chan *chan; |
9f69bda6 | 4344 | |
23691d75 GP |
4345 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4346 | if (!chan) | |
9f69bda6 GP |
4347 | goto drop; |
4348 | ||
23691d75 GP |
4349 | sk = chan->sk; |
4350 | ||
aa2ac881 | 4351 | lock_sock(sk); |
9f69bda6 GP |
4352 | |
4353 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4354 | ||
89bc500e | 4355 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4356 | goto drop; |
4357 | ||
e13e21dc | 4358 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4359 | goto drop; |
4360 | ||
23070494 | 4361 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
4362 | goto done; |
4363 | ||
4364 | drop: | |
4365 | kfree_skb(skb); | |
4366 | ||
4367 | done: | |
4368 | if (sk) | |
aa2ac881 | 4369 | release_sock(sk); |
9f69bda6 GP |
4370 | return 0; |
4371 | } | |
4372 | ||
1da177e4 LT |
4373 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4374 | { | |
4375 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4376 | u16 cid, len; |
4377 | __le16 psm; | |
1da177e4 LT |
4378 | |
4379 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4380 | cid = __le16_to_cpu(lh->cid); | |
4381 | len = __le16_to_cpu(lh->len); | |
4382 | ||
1c2acffb GP |
4383 | if (len != skb->len) { |
4384 | kfree_skb(skb); | |
4385 | return; | |
4386 | } | |
4387 | ||
1da177e4 LT |
4388 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4389 | ||
4390 | switch (cid) { | |
3300d9a9 | 4391 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4392 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4393 | l2cap_sig_channel(conn, skb); |
4394 | break; | |
4395 | ||
8db4dc46 | 4396 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4397 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4398 | skb_pull(skb, 2); |
4399 | l2cap_conless_channel(conn, psm, skb); | |
4400 | break; | |
4401 | ||
9f69bda6 GP |
4402 | case L2CAP_CID_LE_DATA: |
4403 | l2cap_att_channel(conn, cid, skb); | |
4404 | break; | |
4405 | ||
b501d6a1 AB |
4406 | case L2CAP_CID_SMP: |
4407 | if (smp_sig_channel(conn, skb)) | |
4408 | l2cap_conn_del(conn->hcon, EACCES); | |
4409 | break; | |
4410 | ||
1da177e4 LT |
4411 | default: |
4412 | l2cap_data_channel(conn, cid, skb); | |
4413 | break; | |
4414 | } | |
4415 | } | |
4416 | ||
4417 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4418 | ||
4419 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4420 | { | |
4421 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4422 | struct l2cap_chan *c; |
1da177e4 LT |
4423 | |
4424 | if (type != ACL_LINK) | |
963cf687 | 4425 | return -EINVAL; |
1da177e4 LT |
4426 | |
4427 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4428 | ||
4429 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4430 | read_lock(&chan_list_lock); |
4431 | list_for_each_entry(c, &chan_list, global_l) { | |
4432 | struct sock *sk = c->sk; | |
4343478f | 4433 | |
89bc500e | 4434 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4435 | continue; |
4436 | ||
4437 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4438 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4439 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4440 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4441 | exact++; |
2af6b9d5 MH |
4442 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4443 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4444 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4445 | lm2 |= HCI_LM_MASTER; |
4446 | } | |
1da177e4 | 4447 | } |
23691d75 | 4448 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4449 | |
4450 | return exact ? lm1 : lm2; | |
4451 | } | |
4452 | ||
4453 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4454 | { | |
0139418c MH |
4455 | struct l2cap_conn *conn; |
4456 | ||
1da177e4 LT |
4457 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4458 | ||
acd7d370 | 4459 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4460 | return -EINVAL; |
1da177e4 LT |
4461 | |
4462 | if (!status) { | |
1da177e4 LT |
4463 | conn = l2cap_conn_add(hcon, status); |
4464 | if (conn) | |
4465 | l2cap_conn_ready(conn); | |
0139418c | 4466 | } else |
e175072f | 4467 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4468 | |
4469 | return 0; | |
4470 | } | |
4471 | ||
2950f21a MH |
4472 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4473 | { | |
4474 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4475 | ||
4476 | BT_DBG("hcon %p", hcon); | |
4477 | ||
b5694506 | 4478 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
9f5a0d7b | 4479 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4480 | |
4481 | return conn->disc_reason; | |
4482 | } | |
4483 | ||
4484 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4485 | { |
4486 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4487 | ||
acd7d370 | 4488 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4489 | return -EINVAL; |
1da177e4 | 4490 | |
e175072f | 4491 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4492 | |
1da177e4 LT |
4493 | return 0; |
4494 | } | |
4495 | ||
4343478f | 4496 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4497 | { |
715ec005 | 4498 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4499 | return; |
4500 | ||
f62e4323 | 4501 | if (encrypt == 0x00) { |
4343478f | 4502 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 | 4503 | __clear_chan_timer(chan); |
f3f668b0 | 4504 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4505 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4506 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4507 | } else { |
4343478f | 4508 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4509 | __clear_chan_timer(chan); |
f62e4323 MH |
4510 | } |
4511 | } | |
4512 | ||
8c1b2355 | 4513 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4514 | { |
0139418c | 4515 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4516 | struct l2cap_chan *chan; |
1da177e4 | 4517 | |
0139418c | 4518 | if (!conn) |
1da177e4 | 4519 | return 0; |
0139418c | 4520 | |
1da177e4 LT |
4521 | BT_DBG("conn %p", conn); |
4522 | ||
160dc6ac VCG |
4523 | if (hcon->type == LE_LINK) { |
4524 | smp_distribute_keys(conn, 0); | |
4525 | del_timer(&conn->security_timer); | |
4526 | } | |
4527 | ||
3d57dc68 | 4528 | rcu_read_lock(); |
1da177e4 | 4529 | |
3d57dc68 | 4530 | list_for_each_entry_rcu(chan, &conn->chan_l, list) { |
48454079 | 4531 | struct sock *sk = chan->sk; |
baa7e1fa | 4532 | |
1da177e4 LT |
4533 | bh_lock_sock(sk); |
4534 | ||
f1cb9af5 VCG |
4535 | BT_DBG("chan->scid %d", chan->scid); |
4536 | ||
4537 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4538 | if (!status && encrypt) { | |
4539 | chan->sec_level = hcon->sec_level; | |
4540 | l2cap_chan_ready(sk); | |
4541 | } | |
4542 | ||
4543 | bh_unlock_sock(sk); | |
4544 | continue; | |
4545 | } | |
4546 | ||
c1360a1c | 4547 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4548 | bh_unlock_sock(sk); |
4549 | continue; | |
4550 | } | |
4551 | ||
89bc500e GP |
4552 | if (!status && (chan->state == BT_CONNECTED || |
4553 | chan->state == BT_CONFIG)) { | |
4343478f | 4554 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4555 | bh_unlock_sock(sk); |
4556 | continue; | |
4557 | } | |
4558 | ||
89bc500e | 4559 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4560 | if (!status) { |
4561 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4562 | req.scid = cpu_to_le16(chan->scid); |
4563 | req.psm = chan->psm; | |
1da177e4 | 4564 | |
fc7f8a7e | 4565 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4566 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4567 | |
fc7f8a7e | 4568 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4569 | L2CAP_CONN_REQ, sizeof(req), &req); |
4570 | } else { | |
c9b66675 | 4571 | __clear_chan_timer(chan); |
f3f668b0 | 4572 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4573 | } |
89bc500e | 4574 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4575 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4576 | __u16 res, stat; |
1da177e4 | 4577 | |
b1235d79 | 4578 | if (!status) { |
df3c3931 JH |
4579 | if (bt_sk(sk)->defer_setup) { |
4580 | struct sock *parent = bt_sk(sk)->parent; | |
4581 | res = L2CAP_CR_PEND; | |
4582 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4583 | if (parent) |
4584 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4585 | } else { |
05558911 | 4586 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4587 | res = L2CAP_CR_SUCCESS; |
4588 | stat = L2CAP_CS_NO_INFO; | |
4589 | } | |
b1235d79 | 4590 | } else { |
89bc500e | 4591 | l2cap_state_change(chan, BT_DISCONN); |
f3f668b0 | 4592 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4593 | res = L2CAP_CR_SEC_BLOCK; |
4594 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4595 | } |
4596 | ||
fe4128e0 GP |
4597 | rsp.scid = cpu_to_le16(chan->dcid); |
4598 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4599 | rsp.result = cpu_to_le16(res); |
4600 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4601 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4602 | sizeof(rsp), &rsp); | |
b1235d79 | 4603 | } |
1da177e4 LT |
4604 | |
4605 | bh_unlock_sock(sk); | |
4606 | } | |
4607 | ||
3d57dc68 | 4608 | rcu_read_unlock(); |
b1235d79 | 4609 | |
1da177e4 LT |
4610 | return 0; |
4611 | } | |
4612 | ||
4613 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4614 | { | |
4615 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4616 | ||
5a08ecce AE |
4617 | if (!conn) |
4618 | conn = l2cap_conn_add(hcon, 0); | |
4619 | ||
4620 | if (!conn) | |
1da177e4 LT |
4621 | goto drop; |
4622 | ||
4623 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4624 | ||
e702112f | 4625 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4626 | struct l2cap_hdr *hdr; |
48454079 | 4627 | struct l2cap_chan *chan; |
89794813 | 4628 | u16 cid; |
1da177e4 LT |
4629 | int len; |
4630 | ||
4631 | if (conn->rx_len) { | |
4632 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4633 | kfree_skb(conn->rx_skb); | |
4634 | conn->rx_skb = NULL; | |
4635 | conn->rx_len = 0; | |
4636 | l2cap_conn_unreliable(conn, ECOMM); | |
4637 | } | |
4638 | ||
aae7fe22 AE |
4639 | /* Start fragment always begin with Basic L2CAP header */ |
4640 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4641 | BT_ERR("Frame is too short (len %d)", skb->len); |
4642 | l2cap_conn_unreliable(conn, ECOMM); | |
4643 | goto drop; | |
4644 | } | |
4645 | ||
4646 | hdr = (struct l2cap_hdr *) skb->data; | |
4647 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4648 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4649 | |
4650 | if (len == skb->len) { | |
4651 | /* Complete frame received */ | |
4652 | l2cap_recv_frame(conn, skb); | |
4653 | return 0; | |
4654 | } | |
4655 | ||
4656 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4657 | ||
4658 | if (skb->len > len) { | |
4659 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4660 | skb->len, len); | |
4661 | l2cap_conn_unreliable(conn, ECOMM); | |
4662 | goto drop; | |
4663 | } | |
4664 | ||
baa7e1fa | 4665 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4666 | |
48454079 GP |
4667 | if (chan && chan->sk) { |
4668 | struct sock *sk = chan->sk; | |
89794813 | 4669 | |
0c1bc5c6 | 4670 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4671 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4672 | "MTU %d)", len, | |
0c1bc5c6 | 4673 | chan->imtu); |
aa2ac881 | 4674 | release_sock(sk); |
48454079 GP |
4675 | l2cap_conn_unreliable(conn, ECOMM); |
4676 | goto drop; | |
4677 | } | |
aa2ac881 | 4678 | release_sock(sk); |
48454079 | 4679 | } |
89794813 | 4680 | |
1da177e4 | 4681 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4682 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4683 | if (!conn->rx_skb) | |
1da177e4 LT |
4684 | goto drop; |
4685 | ||
d626f62b | 4686 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4687 | skb->len); |
1da177e4 LT |
4688 | conn->rx_len = len - skb->len; |
4689 | } else { | |
4690 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4691 | ||
4692 | if (!conn->rx_len) { | |
4693 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4694 | l2cap_conn_unreliable(conn, ECOMM); | |
4695 | goto drop; | |
4696 | } | |
4697 | ||
4698 | if (skb->len > conn->rx_len) { | |
4699 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4700 | skb->len, conn->rx_len); | |
4701 | kfree_skb(conn->rx_skb); | |
4702 | conn->rx_skb = NULL; | |
4703 | conn->rx_len = 0; | |
4704 | l2cap_conn_unreliable(conn, ECOMM); | |
4705 | goto drop; | |
4706 | } | |
4707 | ||
d626f62b | 4708 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4709 | skb->len); |
1da177e4 LT |
4710 | conn->rx_len -= skb->len; |
4711 | ||
4712 | if (!conn->rx_len) { | |
4713 | /* Complete frame received */ | |
4714 | l2cap_recv_frame(conn, conn->rx_skb); | |
4715 | conn->rx_skb = NULL; | |
4716 | } | |
4717 | } | |
4718 | ||
4719 | drop: | |
4720 | kfree_skb(skb); | |
4721 | return 0; | |
4722 | } | |
4723 | ||
aef7d97c | 4724 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4725 | { |
23691d75 | 4726 | struct l2cap_chan *c; |
1da177e4 | 4727 | |
23691d75 | 4728 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4729 | |
23691d75 GP |
4730 | list_for_each_entry(c, &chan_list, global_l) { |
4731 | struct sock *sk = c->sk; | |
101545f6 | 4732 | |
903d343e | 4733 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4734 | batostr(&bt_sk(sk)->src), |
4735 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4736 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4737 | c->scid, c->dcid, c->imtu, c->omtu, |
4738 | c->sec_level, c->mode); | |
05558911 | 4739 | } |
1da177e4 | 4740 | |
23691d75 | 4741 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4742 | |
aef7d97c | 4743 | return 0; |
1da177e4 LT |
4744 | } |
4745 | ||
aef7d97c MH |
4746 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4747 | { | |
4748 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4749 | } | |
4750 | ||
4751 | static const struct file_operations l2cap_debugfs_fops = { | |
4752 | .open = l2cap_debugfs_open, | |
4753 | .read = seq_read, | |
4754 | .llseek = seq_lseek, | |
4755 | .release = single_release, | |
4756 | }; | |
4757 | ||
4758 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4759 | |
1da177e4 LT |
4760 | static struct hci_proto l2cap_hci_proto = { |
4761 | .name = "L2CAP", | |
4762 | .id = HCI_PROTO_L2CAP, | |
4763 | .connect_ind = l2cap_connect_ind, | |
4764 | .connect_cfm = l2cap_connect_cfm, | |
4765 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4766 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4767 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4768 | .recv_acldata = l2cap_recv_acldata |
4769 | }; | |
4770 | ||
64274518 | 4771 | int __init l2cap_init(void) |
1da177e4 LT |
4772 | { |
4773 | int err; | |
be9d1227 | 4774 | |
bb58f747 | 4775 | err = l2cap_init_sockets(); |
1da177e4 LT |
4776 | if (err < 0) |
4777 | return err; | |
4778 | ||
1da177e4 LT |
4779 | err = hci_register_proto(&l2cap_hci_proto); |
4780 | if (err < 0) { | |
4781 | BT_ERR("L2CAP protocol registration failed"); | |
4782 | bt_sock_unregister(BTPROTO_L2CAP); | |
4783 | goto error; | |
4784 | } | |
4785 | ||
aef7d97c MH |
4786 | if (bt_debugfs) { |
4787 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4788 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4789 | if (!l2cap_debugfs) | |
4790 | BT_ERR("Failed to create L2CAP debug file"); | |
4791 | } | |
1da177e4 | 4792 | |
1da177e4 LT |
4793 | return 0; |
4794 | ||
4795 | error: | |
bb58f747 | 4796 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4797 | return err; |
4798 | } | |
4799 | ||
64274518 | 4800 | void l2cap_exit(void) |
1da177e4 | 4801 | { |
aef7d97c | 4802 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4803 | |
1da177e4 LT |
4804 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4805 | BT_ERR("L2CAP protocol unregistration failed"); | |
4806 | ||
bb58f747 | 4807 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4808 | } |
4809 | ||
d1c4a17d GP |
4810 | module_param(disable_ertm, bool, 0644); |
4811 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |