Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
1da177e4 LT |
7 | |
8 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License version 2 as | |
12 | published by the Free Software Foundation; | |
13 | ||
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
15 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
17 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
18 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
21 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
22 | ||
8e87d142 YH |
23 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
24 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
25 | SOFTWARE IS DISCLAIMED. |
26 | */ | |
27 | ||
bb58f747 | 28 | /* Bluetooth L2CAP core. */ |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <linux/module.h> |
31 | ||
32 | #include <linux/types.h> | |
4fc268d2 | 33 | #include <linux/capability.h> |
1da177e4 LT |
34 | #include <linux/errno.h> |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #include <linux/sched.h> |
37 | #include <linux/slab.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/fcntl.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/interrupt.h> | |
42 | #include <linux/socket.h> | |
43 | #include <linux/skbuff.h> | |
1da177e4 | 44 | #include <linux/list.h> |
be9d1227 | 45 | #include <linux/device.h> |
aef7d97c MH |
46 | #include <linux/debugfs.h> |
47 | #include <linux/seq_file.h> | |
af05b30b | 48 | #include <linux/uaccess.h> |
fcc203c3 | 49 | #include <linux/crc16.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | ||
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 | |
eb939922 | 59 | bool 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 | |
0139418c | 75 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 76 | |
baa7e1fa | 77 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 78 | { |
3df91ea2 | 79 | struct l2cap_chan *c; |
3d57dc68 | 80 | |
3df91ea2 AE |
81 | list_for_each_entry(c, &conn->chan_l, list) { |
82 | if (c->dcid == cid) | |
83 | return c; | |
0139418c | 84 | } |
3df91ea2 | 85 | return NULL; |
0139418c MH |
86 | } |
87 | ||
baa7e1fa | 88 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 89 | { |
3df91ea2 | 90 | struct l2cap_chan *c; |
3d57dc68 | 91 | |
3df91ea2 AE |
92 | list_for_each_entry(c, &conn->chan_l, list) { |
93 | if (c->scid == cid) | |
94 | return c; | |
0139418c | 95 | } |
3df91ea2 | 96 | return NULL; |
0139418c MH |
97 | } |
98 | ||
99 | /* Find channel with given SCID. | |
100 | * Returns locked socket */ | |
baa7e1fa | 101 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 102 | { |
48454079 | 103 | struct l2cap_chan *c; |
baa7e1fa | 104 | |
3df91ea2 | 105 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 106 | c = __l2cap_get_chan_by_scid(conn, cid); |
3df91ea2 AE |
107 | mutex_unlock(&conn->chan_lock); |
108 | ||
48454079 | 109 | return c; |
0139418c MH |
110 | } |
111 | ||
baa7e1fa | 112 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 113 | { |
3df91ea2 | 114 | struct l2cap_chan *c; |
3d57dc68 | 115 | |
3df91ea2 AE |
116 | list_for_each_entry(c, &conn->chan_l, list) { |
117 | if (c->ident == ident) | |
118 | return c; | |
0139418c | 119 | } |
3df91ea2 | 120 | return NULL; |
0139418c MH |
121 | } |
122 | ||
baa7e1fa | 123 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 124 | { |
48454079 | 125 | struct l2cap_chan *c; |
baa7e1fa | 126 | |
3df91ea2 | 127 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 128 | c = __l2cap_get_chan_by_ident(conn, ident); |
3df91ea2 AE |
129 | mutex_unlock(&conn->chan_lock); |
130 | ||
48454079 | 131 | return c; |
0139418c MH |
132 | } |
133 | ||
23691d75 | 134 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 135 | { |
23691d75 | 136 | struct l2cap_chan *c; |
9e4425ff | 137 | |
23691d75 GP |
138 | list_for_each_entry(c, &chan_list, global_l) { |
139 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 140 | return c; |
9e4425ff | 141 | } |
250938cb | 142 | return NULL; |
9e4425ff GP |
143 | } |
144 | ||
145 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
146 | { | |
73b2ec18 GP |
147 | int err; |
148 | ||
333055f2 | 149 | write_lock(&chan_list_lock); |
9e4425ff | 150 | |
23691d75 | 151 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
152 | err = -EADDRINUSE; |
153 | goto done; | |
9e4425ff GP |
154 | } |
155 | ||
73b2ec18 GP |
156 | if (psm) { |
157 | chan->psm = psm; | |
158 | chan->sport = psm; | |
159 | err = 0; | |
160 | } else { | |
161 | u16 p; | |
162 | ||
163 | err = -EINVAL; | |
164 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 165 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
166 | chan->psm = cpu_to_le16(p); |
167 | chan->sport = cpu_to_le16(p); | |
168 | err = 0; | |
169 | break; | |
170 | } | |
171 | } | |
9e4425ff | 172 | |
73b2ec18 | 173 | done: |
333055f2 | 174 | write_unlock(&chan_list_lock); |
73b2ec18 | 175 | return err; |
9e4425ff GP |
176 | } |
177 | ||
178 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
179 | { | |
333055f2 | 180 | write_lock(&chan_list_lock); |
9e4425ff GP |
181 | |
182 | chan->scid = scid; | |
183 | ||
333055f2 | 184 | write_unlock(&chan_list_lock); |
9e4425ff GP |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
baa7e1fa | 189 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 190 | { |
8db4dc46 | 191 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 192 | |
8db4dc46 | 193 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 194 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
195 | return cid; |
196 | } | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
0e587be7 | 201 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 202 | { |
42d2d87c | 203 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
204 | state_to_string(state)); |
205 | ||
89bc500e GP |
206 | chan->state = state; |
207 | chan->ops->state_change(chan->data, state); | |
208 | } | |
209 | ||
0e587be7 AE |
210 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
211 | { | |
212 | struct sock *sk = chan->sk; | |
213 | ||
214 | lock_sock(sk); | |
215 | __l2cap_state_change(chan, state); | |
216 | release_sock(sk); | |
217 | } | |
218 | ||
2e0052e4 AE |
219 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
220 | { | |
221 | struct sock *sk = chan->sk; | |
222 | ||
223 | sk->sk_err = err; | |
224 | } | |
225 | ||
226 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
227 | { | |
228 | struct sock *sk = chan->sk; | |
229 | ||
230 | lock_sock(sk); | |
231 | __l2cap_chan_set_err(chan, err); | |
232 | release_sock(sk); | |
233 | } | |
234 | ||
721c4181 | 235 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 236 | { |
721c4181 GP |
237 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
238 | chan_timer.work); | |
3df91ea2 | 239 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
240 | int reason; |
241 | ||
e05dcc32 | 242 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 243 | |
3df91ea2 | 244 | mutex_lock(&conn->chan_lock); |
6be36555 | 245 | l2cap_chan_lock(chan); |
ab07801d | 246 | |
89bc500e | 247 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 248 | reason = ECONNREFUSED; |
89bc500e | 249 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
250 | chan->sec_level != BT_SECURITY_SDP) |
251 | reason = ECONNREFUSED; | |
252 | else | |
253 | reason = ETIMEDOUT; | |
254 | ||
0f852724 | 255 | l2cap_chan_close(chan, reason); |
ab07801d | 256 | |
6be36555 | 257 | l2cap_chan_unlock(chan); |
ab07801d | 258 | |
ba3bd0ee | 259 | chan->ops->close(chan->data); |
3df91ea2 AE |
260 | mutex_unlock(&conn->chan_lock); |
261 | ||
371fd835 | 262 | l2cap_chan_put(chan); |
ab07801d GP |
263 | } |
264 | ||
23691d75 | 265 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
266 | { |
267 | struct l2cap_chan *chan; | |
268 | ||
269 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
270 | if (!chan) | |
271 | return NULL; | |
272 | ||
c03b355e AE |
273 | mutex_init(&chan->lock); |
274 | ||
48454079 GP |
275 | chan->sk = sk; |
276 | ||
333055f2 | 277 | write_lock(&chan_list_lock); |
23691d75 | 278 | list_add(&chan->global_l, &chan_list); |
333055f2 | 279 | write_unlock(&chan_list_lock); |
23691d75 | 280 | |
721c4181 | 281 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 282 | |
89bc500e GP |
283 | chan->state = BT_OPEN; |
284 | ||
71ba0e56 GP |
285 | atomic_set(&chan->refcnt, 1); |
286 | ||
abc545b8 SJ |
287 | BT_DBG("sk %p chan %p", sk, chan); |
288 | ||
48454079 GP |
289 | return chan; |
290 | } | |
291 | ||
23691d75 | 292 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 293 | { |
333055f2 | 294 | write_lock(&chan_list_lock); |
23691d75 | 295 | list_del(&chan->global_l); |
333055f2 | 296 | write_unlock(&chan_list_lock); |
23691d75 | 297 | |
371fd835 | 298 | l2cap_chan_put(chan); |
6ff5abbf GP |
299 | } |
300 | ||
643162a8 | 301 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 302 | { |
af05b30b | 303 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 304 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 305 | |
9f5a0d7b | 306 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 307 | |
8c1d787b | 308 | chan->conn = conn; |
0139418c | 309 | |
5491120e AE |
310 | switch (chan->chan_type) { |
311 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
312 | if (conn->hcon->type == LE_LINK) { |
313 | /* LE connection */ | |
0c1bc5c6 | 314 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
315 | chan->scid = L2CAP_CID_LE_DATA; |
316 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
317 | } else { |
318 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 319 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 320 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 321 | } |
5491120e AE |
322 | break; |
323 | ||
324 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 325 | /* Connectionless socket */ |
fe4128e0 GP |
326 | chan->scid = L2CAP_CID_CONN_LESS; |
327 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 328 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
329 | break; |
330 | ||
331 | default: | |
0139418c | 332 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
333 | chan->scid = L2CAP_CID_SIGNALING; |
334 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 335 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
336 | } |
337 | ||
8f7975b1 AE |
338 | chan->local_id = L2CAP_BESTEFFORT_ID; |
339 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
340 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
341 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
342 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
343 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
344 | ||
371fd835 | 345 | l2cap_chan_hold(chan); |
baa7e1fa | 346 | |
3df91ea2 | 347 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
348 | } |
349 | ||
350 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) | |
351 | { | |
352 | mutex_lock(&conn->chan_lock); | |
353 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 354 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
355 | } |
356 | ||
4519de9a | 357 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 358 | { |
48454079 | 359 | struct sock *sk = chan->sk; |
8c1d787b | 360 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
361 | struct sock *parent = bt_sk(sk)->parent; |
362 | ||
c9b66675 | 363 | __clear_chan_timer(chan); |
0139418c | 364 | |
49208c9c | 365 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 366 | |
8e87d142 | 367 | if (conn) { |
baa7e1fa | 368 | /* Delete from channel list */ |
3df91ea2 | 369 | list_del(&chan->list); |
3d57dc68 | 370 | |
371fd835 | 371 | l2cap_chan_put(chan); |
baa7e1fa | 372 | |
8c1d787b | 373 | chan->conn = NULL; |
0139418c MH |
374 | hci_conn_put(conn->hcon); |
375 | } | |
376 | ||
6be36555 AE |
377 | lock_sock(sk); |
378 | ||
0e587be7 | 379 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
380 | sock_set_flag(sk, SOCK_ZAPPED); |
381 | ||
382 | if (err) | |
2e0052e4 | 383 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
384 | |
385 | if (parent) { | |
386 | bt_accept_unlink(sk); | |
387 | parent->sk_data_ready(parent, 0); | |
388 | } else | |
389 | sk->sk_state_change(sk); | |
c13ffa62 | 390 | |
6be36555 AE |
391 | release_sock(sk); |
392 | ||
c1360a1c GP |
393 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
394 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 395 | return; |
2ead70b8 | 396 | |
58d35f87 | 397 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 398 | |
0c1bc5c6 | 399 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
400 | struct srej_list *l, *tmp; |
401 | ||
1a09bcb9 GP |
402 | __clear_retrans_timer(chan); |
403 | __clear_monitor_timer(chan); | |
404 | __clear_ack_timer(chan); | |
c13ffa62 | 405 | |
f1c6775b | 406 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 407 | |
39d5a3ee | 408 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
409 | list_del(&l->list); |
410 | kfree(l); | |
411 | } | |
412 | } | |
0139418c MH |
413 | } |
414 | ||
4519de9a GP |
415 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
416 | { | |
417 | struct sock *sk; | |
418 | ||
419 | BT_DBG("parent %p", parent); | |
420 | ||
421 | /* Close not yet accepted channels */ | |
0f852724 | 422 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 423 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 424 | |
6be36555 | 425 | l2cap_chan_lock(chan); |
c9b66675 | 426 | __clear_chan_timer(chan); |
ba3bd0ee | 427 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 428 | l2cap_chan_unlock(chan); |
3df91ea2 | 429 | |
ba3bd0ee | 430 | chan->ops->close(chan->data); |
0f852724 | 431 | } |
4519de9a GP |
432 | } |
433 | ||
0f852724 | 434 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
435 | { |
436 | struct l2cap_conn *conn = chan->conn; | |
437 | struct sock *sk = chan->sk; | |
438 | ||
e05dcc32 AE |
439 | BT_DBG("chan %p state %s sk %p", chan, |
440 | state_to_string(chan->state), sk); | |
4519de9a | 441 | |
89bc500e | 442 | switch (chan->state) { |
4519de9a | 443 | case BT_LISTEN: |
6be36555 | 444 | lock_sock(sk); |
4519de9a | 445 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 446 | |
0e587be7 | 447 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 448 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 449 | release_sock(sk); |
4519de9a GP |
450 | break; |
451 | ||
452 | case BT_CONNECTED: | |
453 | case BT_CONFIG: | |
715ec005 | 454 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 455 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
456 | __clear_chan_timer(chan); |
457 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
458 | l2cap_send_disconn_req(conn, chan, reason); |
459 | } else | |
460 | l2cap_chan_del(chan, reason); | |
461 | break; | |
462 | ||
463 | case BT_CONNECT2: | |
715ec005 | 464 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
465 | conn->hcon->type == ACL_LINK) { |
466 | struct l2cap_conn_rsp rsp; | |
467 | __u16 result; | |
468 | ||
469 | if (bt_sk(sk)->defer_setup) | |
470 | result = L2CAP_CR_SEC_BLOCK; | |
471 | else | |
472 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 473 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
474 | |
475 | rsp.scid = cpu_to_le16(chan->dcid); | |
476 | rsp.dcid = cpu_to_le16(chan->scid); | |
477 | rsp.result = cpu_to_le16(result); | |
478 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
479 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
480 | sizeof(rsp), &rsp); | |
481 | } | |
482 | ||
483 | l2cap_chan_del(chan, reason); | |
484 | break; | |
485 | ||
486 | case BT_CONNECT: | |
487 | case BT_DISCONN: | |
488 | l2cap_chan_del(chan, reason); | |
489 | break; | |
490 | ||
491 | default: | |
6be36555 | 492 | lock_sock(sk); |
4519de9a | 493 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 494 | release_sock(sk); |
4519de9a GP |
495 | break; |
496 | } | |
497 | } | |
498 | ||
4343478f | 499 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 500 | { |
715ec005 | 501 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 502 | switch (chan->sec_level) { |
8556edd3 JH |
503 | case BT_SECURITY_HIGH: |
504 | return HCI_AT_DEDICATED_BONDING_MITM; | |
505 | case BT_SECURITY_MEDIUM: | |
506 | return HCI_AT_DEDICATED_BONDING; | |
507 | default: | |
508 | return HCI_AT_NO_BONDING; | |
509 | } | |
fe4128e0 | 510 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
511 | if (chan->sec_level == BT_SECURITY_LOW) |
512 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 513 | |
4343478f | 514 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 515 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 516 | else |
8556edd3 | 517 | return HCI_AT_NO_BONDING; |
00ae4af9 | 518 | } else { |
4343478f | 519 | switch (chan->sec_level) { |
00ae4af9 | 520 | case BT_SECURITY_HIGH: |
8556edd3 | 521 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 522 | case BT_SECURITY_MEDIUM: |
8556edd3 | 523 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 524 | default: |
8556edd3 | 525 | return HCI_AT_NO_BONDING; |
00ae4af9 | 526 | } |
0684e5f9 | 527 | } |
8556edd3 JH |
528 | } |
529 | ||
530 | /* Service level security */ | |
d45fc423 | 531 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 532 | { |
8c1d787b | 533 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
534 | __u8 auth_type; |
535 | ||
4343478f | 536 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 537 | |
4343478f | 538 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
539 | } |
540 | ||
b5ad8b7f | 541 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
542 | { |
543 | u8 id; | |
544 | ||
545 | /* Get next available identificator. | |
546 | * 1 - 128 are used by kernel. | |
547 | * 129 - 199 are reserved. | |
548 | * 200 - 254 are used by utilities like l2ping, etc. | |
549 | */ | |
550 | ||
333055f2 | 551 | spin_lock(&conn->lock); |
4e8402a3 MH |
552 | |
553 | if (++conn->tx_ident > 128) | |
554 | conn->tx_ident = 1; | |
555 | ||
556 | id = conn->tx_ident; | |
557 | ||
333055f2 | 558 | spin_unlock(&conn->lock); |
4e8402a3 MH |
559 | |
560 | return id; | |
561 | } | |
562 | ||
4519de9a | 563 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
564 | { |
565 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 566 | u8 flags; |
4e8402a3 MH |
567 | |
568 | BT_DBG("code 0x%2.2x", code); | |
569 | ||
570 | if (!skb) | |
9a9c6a34 | 571 | return; |
4e8402a3 | 572 | |
e702112f AE |
573 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
574 | flags = ACL_START_NO_FLUSH; | |
575 | else | |
576 | flags = ACL_START; | |
577 | ||
14b12d0b | 578 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 579 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 580 | |
73d80deb LAD |
581 | hci_send_acl(conn->hchan, skb, flags); |
582 | } | |
583 | ||
584 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
585 | { | |
586 | struct hci_conn *hcon = chan->conn->hcon; | |
587 | u16 flags; | |
588 | ||
589 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
590 | skb->priority); | |
591 | ||
592 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
593 | lmp_no_flush_capable(hcon->hdev)) | |
594 | flags = ACL_START_NO_FLUSH; | |
595 | else | |
596 | flags = ACL_START; | |
14b12d0b | 597 | |
73d80deb LAD |
598 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
599 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
600 | } |
601 | ||
88843ab0 | 602 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
1c2acffb GP |
603 | { |
604 | struct sk_buff *skb; | |
605 | struct l2cap_hdr *lh; | |
8c1d787b | 606 | struct l2cap_conn *conn = chan->conn; |
e4ca6d98 | 607 | int count, hlen; |
fcc203c3 | 608 | |
89bc500e | 609 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
610 | return; |
611 | ||
e4ca6d98 AE |
612 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
613 | hlen = L2CAP_EXT_HDR_SIZE; | |
614 | else | |
615 | hlen = L2CAP_ENH_HDR_SIZE; | |
616 | ||
47d1ec61 | 617 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 618 | hlen += L2CAP_FCS_SIZE; |
1c2acffb | 619 | |
88843ab0 | 620 | BT_DBG("chan %p, control 0x%8.8x", chan, control); |
1c2acffb | 621 | |
fcc203c3 | 622 | count = min_t(unsigned int, conn->mtu, hlen); |
793c2f1c AE |
623 | |
624 | control |= __set_sframe(chan); | |
1c2acffb | 625 | |
e2ab4353 | 626 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 627 | control |= __set_ctrl_final(chan); |
9e917af1 | 628 | |
e2ab4353 | 629 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
e3781735 | 630 | control |= __set_ctrl_poll(chan); |
f0946ccf | 631 | |
1c2acffb GP |
632 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
633 | if (!skb) | |
9a9c6a34 | 634 | return; |
1c2acffb GP |
635 | |
636 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 637 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 638 | lh->cid = cpu_to_le16(chan->dcid); |
88843ab0 AE |
639 | |
640 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1c2acffb | 641 | |
47d1ec61 | 642 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
643 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); |
644 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
645 | } |
646 | ||
73d80deb LAD |
647 | skb->priority = HCI_PRIO_MAX; |
648 | l2cap_do_send(chan, skb); | |
1c2acffb GP |
649 | } |
650 | ||
88843ab0 | 651 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) |
7e743090 | 652 | { |
e2ab4353 | 653 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 654 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 655 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 656 | } else |
ab784b73 | 657 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 658 | |
0b209fae | 659 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 660 | |
525cd185 | 661 | l2cap_send_sframe(chan, control); |
7e743090 GP |
662 | } |
663 | ||
b4450035 | 664 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 665 | { |
c1360a1c | 666 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
667 | } |
668 | ||
9b27f350 AE |
669 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
670 | { | |
671 | struct l2cap_conn *conn = chan->conn; | |
672 | struct l2cap_conn_req req; | |
673 | ||
674 | req.scid = cpu_to_le16(chan->scid); | |
675 | req.psm = chan->psm; | |
676 | ||
677 | chan->ident = l2cap_get_ident(conn); | |
678 | ||
679 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
680 | ||
681 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
682 | } | |
683 | ||
fc7f8a7e | 684 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 685 | { |
8c1d787b | 686 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
687 | |
688 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
689 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
690 | return; | |
691 | ||
d45fc423 | 692 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
693 | __l2cap_no_conn_pending(chan)) |
694 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
695 | } else { |
696 | struct l2cap_info_req req; | |
697 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
698 | ||
699 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
700 | conn->info_ident = l2cap_get_ident(conn); | |
701 | ||
ba13ccd9 | 702 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
703 | |
704 | l2cap_send_cmd(conn, conn->info_ident, | |
705 | L2CAP_INFO_REQ, sizeof(req), &req); | |
706 | } | |
707 | } | |
708 | ||
cf6c2c0b GP |
709 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
710 | { | |
711 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 712 | if (!disable_ertm) |
cf6c2c0b GP |
713 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
714 | ||
715 | switch (mode) { | |
716 | case L2CAP_MODE_ERTM: | |
717 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
718 | case L2CAP_MODE_STREAMING: | |
719 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
720 | default: | |
721 | return 0x00; | |
722 | } | |
723 | } | |
724 | ||
4519de9a | 725 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 726 | { |
6be36555 | 727 | struct sock *sk = chan->sk; |
22121fc9 GP |
728 | struct l2cap_disconn_req req; |
729 | ||
c13ffa62 GP |
730 | if (!conn) |
731 | return; | |
732 | ||
0c1bc5c6 | 733 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
734 | __clear_retrans_timer(chan); |
735 | __clear_monitor_timer(chan); | |
736 | __clear_ack_timer(chan); | |
c13ffa62 GP |
737 | } |
738 | ||
fe4128e0 GP |
739 | req.dcid = cpu_to_le16(chan->dcid); |
740 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
741 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
742 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 743 | |
6be36555 | 744 | lock_sock(sk); |
0e587be7 | 745 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 746 | __l2cap_chan_set_err(chan, err); |
6be36555 | 747 | release_sock(sk); |
22121fc9 GP |
748 | } |
749 | ||
1da177e4 | 750 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
751 | static void l2cap_conn_start(struct l2cap_conn *conn) |
752 | { | |
3df91ea2 | 753 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
754 | |
755 | BT_DBG("conn %p", conn); | |
756 | ||
3df91ea2 | 757 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 758 | |
3df91ea2 | 759 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 760 | struct sock *sk = chan->sk; |
baa7e1fa | 761 | |
6be36555 | 762 | l2cap_chan_lock(chan); |
4e8402a3 | 763 | |
715ec005 | 764 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 765 | l2cap_chan_unlock(chan); |
79d554a6 MH |
766 | continue; |
767 | } | |
768 | ||
89bc500e | 769 | if (chan->state == BT_CONNECT) { |
d45fc423 | 770 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 771 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 772 | l2cap_chan_unlock(chan); |
47731de7 GP |
773 | continue; |
774 | } | |
79d554a6 | 775 | |
c1360a1c GP |
776 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
777 | && test_bit(CONF_STATE2_DEVICE, | |
778 | &chan->conf_state)) { | |
89bc500e | 779 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 780 | l2cap_chan_unlock(chan); |
47731de7 | 781 | continue; |
b1235d79 | 782 | } |
47731de7 | 783 | |
9b27f350 | 784 | l2cap_send_conn_req(chan); |
47731de7 | 785 | |
89bc500e | 786 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 787 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 788 | char buf[128]; |
fe4128e0 GP |
789 | rsp.scid = cpu_to_le16(chan->dcid); |
790 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 791 | |
d45fc423 | 792 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 793 | lock_sock(sk); |
f66dc81f MH |
794 | if (bt_sk(sk)->defer_setup) { |
795 | struct sock *parent = bt_sk(sk)->parent; | |
796 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
797 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
798 | if (parent) |
799 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
800 | |
801 | } else { | |
0e587be7 | 802 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
803 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
804 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
805 | } | |
6be36555 | 806 | release_sock(sk); |
79d554a6 MH |
807 | } else { |
808 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
809 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
810 | } | |
811 | ||
fc7f8a7e GP |
812 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
813 | sizeof(rsp), &rsp); | |
e9aeb2dd | 814 | |
c1360a1c | 815 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 816 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 817 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
818 | continue; |
819 | } | |
820 | ||
c1360a1c | 821 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 822 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
823 | l2cap_build_conf_req(chan, buf), buf); |
824 | chan->num_conf_req++; | |
4e8402a3 MH |
825 | } |
826 | ||
6be36555 | 827 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
828 | } |
829 | ||
3df91ea2 | 830 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
831 | } |
832 | ||
b62f328b VT |
833 | /* Find socket with cid and source bdaddr. |
834 | * Returns closest match, locked. | |
835 | */ | |
23691d75 | 836 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 837 | { |
23691d75 | 838 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 839 | |
23691d75 | 840 | read_lock(&chan_list_lock); |
b62f328b | 841 | |
23691d75 GP |
842 | list_for_each_entry(c, &chan_list, global_l) { |
843 | struct sock *sk = c->sk; | |
fe4128e0 | 844 | |
89bc500e | 845 | if (state && c->state != state) |
b62f328b VT |
846 | continue; |
847 | ||
23691d75 | 848 | if (c->scid == cid) { |
b62f328b | 849 | /* Exact match. */ |
23691d75 GP |
850 | if (!bacmp(&bt_sk(sk)->src, src)) { |
851 | read_unlock(&chan_list_lock); | |
852 | return c; | |
853 | } | |
b62f328b VT |
854 | |
855 | /* Closest match */ | |
856 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 857 | c1 = c; |
b62f328b VT |
858 | } |
859 | } | |
280f294f | 860 | |
23691d75 | 861 | read_unlock(&chan_list_lock); |
b62f328b | 862 | |
23691d75 | 863 | return c1; |
b62f328b VT |
864 | } |
865 | ||
866 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
867 | { | |
c916fbe4 | 868 | struct sock *parent, *sk; |
23691d75 | 869 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
870 | |
871 | BT_DBG(""); | |
872 | ||
873 | /* Check if we have socket listening on cid */ | |
23691d75 | 874 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 875 | conn->src); |
23691d75 | 876 | if (!pchan) |
b62f328b VT |
877 | return; |
878 | ||
23691d75 GP |
879 | parent = pchan->sk; |
880 | ||
aa2ac881 | 881 | lock_sock(parent); |
62f3a2cf | 882 | |
b62f328b VT |
883 | /* Check for backlog size */ |
884 | if (sk_acceptq_is_full(parent)) { | |
885 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
886 | goto clean; | |
887 | } | |
888 | ||
80808e43 GP |
889 | chan = pchan->ops->new_connection(pchan->data); |
890 | if (!chan) | |
b62f328b VT |
891 | goto clean; |
892 | ||
80808e43 | 893 | sk = chan->sk; |
5d41ce1d | 894 | |
b62f328b VT |
895 | hci_conn_hold(conn->hcon); |
896 | ||
b62f328b VT |
897 | bacpy(&bt_sk(sk)->src, conn->src); |
898 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
899 | ||
d1010240 GP |
900 | bt_accept_enqueue(parent, sk); |
901 | ||
3d57dc68 | 902 | l2cap_chan_add(conn, chan); |
48454079 | 903 | |
c9b66675 | 904 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 905 | |
0e587be7 | 906 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
907 | parent->sk_data_ready(parent, 0); |
908 | ||
b62f328b | 909 | clean: |
aa2ac881 | 910 | release_sock(parent); |
b62f328b VT |
911 | } |
912 | ||
cf4cd009 | 913 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
f1cb9af5 | 914 | { |
cf4cd009 | 915 | struct sock *sk = chan->sk; |
6be36555 AE |
916 | struct sock *parent; |
917 | ||
918 | lock_sock(sk); | |
919 | ||
920 | parent = bt_sk(sk)->parent; | |
f1cb9af5 VCG |
921 | |
922 | BT_DBG("sk %p, parent %p", sk, parent); | |
923 | ||
924 | chan->conf_state = 0; | |
925 | __clear_chan_timer(chan); | |
926 | ||
0e587be7 | 927 | __l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
928 | sk->sk_state_change(sk); |
929 | ||
930 | if (parent) | |
931 | parent->sk_data_ready(parent, 0); | |
6be36555 AE |
932 | |
933 | release_sock(sk); | |
f1cb9af5 VCG |
934 | } |
935 | ||
4e8402a3 MH |
936 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
937 | { | |
48454079 | 938 | struct l2cap_chan *chan; |
4e8402a3 | 939 | |
79d554a6 | 940 | BT_DBG("conn %p", conn); |
4e8402a3 | 941 | |
b62f328b VT |
942 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
943 | l2cap_le_conn_ready(conn); | |
944 | ||
160dc6ac VCG |
945 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
946 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
947 | ||
3df91ea2 | 948 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 949 | |
3df91ea2 | 950 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 951 | |
6be36555 | 952 | l2cap_chan_lock(chan); |
4e8402a3 | 953 | |
63128451 | 954 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 955 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 956 | l2cap_chan_ready(chan); |
acd7d370 | 957 | |
63128451 | 958 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 959 | struct sock *sk = chan->sk; |
c9b66675 | 960 | __clear_chan_timer(chan); |
6be36555 | 961 | lock_sock(sk); |
0e587be7 | 962 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 963 | sk->sk_state_change(sk); |
6be36555 | 964 | release_sock(sk); |
b501d6a1 | 965 | |
89bc500e | 966 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 967 | l2cap_do_start(chan); |
4e8402a3 | 968 | |
6be36555 | 969 | l2cap_chan_unlock(chan); |
4e8402a3 | 970 | } |
79d554a6 | 971 | |
3df91ea2 | 972 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
973 | } |
974 | ||
975 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
976 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
977 | { | |
48454079 | 978 | struct l2cap_chan *chan; |
4e8402a3 MH |
979 | |
980 | BT_DBG("conn %p", conn); | |
981 | ||
3df91ea2 | 982 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 983 | |
3df91ea2 | 984 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 985 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 986 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
987 | } |
988 | ||
3df91ea2 | 989 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
990 | } |
991 | ||
f878fcad | 992 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 993 | { |
f878fcad | 994 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 995 | info_timer.work); |
4e8402a3 | 996 | |
984947dc | 997 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 998 | conn->info_ident = 0; |
984947dc | 999 | |
4e8402a3 MH |
1000 | l2cap_conn_start(conn); |
1001 | } | |
1002 | ||
5d3de7df VCG |
1003 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1004 | { | |
1005 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1006 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1007 | |
1008 | if (!conn) | |
1009 | return; | |
1010 | ||
1011 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1012 | ||
1013 | kfree_skb(conn->rx_skb); | |
1014 | ||
3df91ea2 AE |
1015 | mutex_lock(&conn->chan_lock); |
1016 | ||
5d3de7df VCG |
1017 | /* Kill channels */ |
1018 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
6be36555 AE |
1019 | l2cap_chan_lock(chan); |
1020 | ||
5d3de7df | 1021 | l2cap_chan_del(chan, err); |
6be36555 AE |
1022 | |
1023 | l2cap_chan_unlock(chan); | |
1024 | ||
5d3de7df VCG |
1025 | chan->ops->close(chan->data); |
1026 | } | |
1027 | ||
3df91ea2 AE |
1028 | mutex_unlock(&conn->chan_lock); |
1029 | ||
73d80deb LAD |
1030 | hci_chan_del(conn->hchan); |
1031 | ||
5d3de7df | 1032 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1033 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1034 | |
51a8efd7 | 1035 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1036 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1037 | smp_chan_destroy(conn); |
d26a2345 | 1038 | } |
5d3de7df VCG |
1039 | |
1040 | hcon->l2cap_data = NULL; | |
1041 | kfree(conn); | |
1042 | } | |
1043 | ||
6c9d42a1 | 1044 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1045 | { |
6c9d42a1 GP |
1046 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1047 | security_timer.work); | |
5d3de7df VCG |
1048 | |
1049 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1050 | } | |
1051 | ||
1da177e4 LT |
1052 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1053 | { | |
0139418c | 1054 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1055 | struct hci_chan *hchan; |
1da177e4 | 1056 | |
0139418c | 1057 | if (conn || status) |
1da177e4 LT |
1058 | return conn; |
1059 | ||
73d80deb LAD |
1060 | hchan = hci_chan_create(hcon); |
1061 | if (!hchan) | |
1062 | return NULL; | |
1063 | ||
0139418c | 1064 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1065 | if (!conn) { |
1066 | hci_chan_del(hchan); | |
1da177e4 | 1067 | return NULL; |
73d80deb | 1068 | } |
1da177e4 LT |
1069 | |
1070 | hcon->l2cap_data = conn; | |
1071 | conn->hcon = hcon; | |
73d80deb | 1072 | conn->hchan = hchan; |
1da177e4 | 1073 | |
73d80deb | 1074 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1075 | |
acd7d370 VT |
1076 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1077 | conn->mtu = hcon->hdev->le_mtu; | |
1078 | else | |
1079 | conn->mtu = hcon->hdev->acl_mtu; | |
1080 | ||
1da177e4 LT |
1081 | conn->src = &hcon->hdev->bdaddr; |
1082 | conn->dst = &hcon->dst; | |
1083 | ||
4e8402a3 MH |
1084 | conn->feat_mask = 0; |
1085 | ||
1da177e4 | 1086 | spin_lock_init(&conn->lock); |
3df91ea2 | 1087 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1088 | |
1089 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1090 | |
5d3de7df | 1091 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1092 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1093 | else |
030013d8 | 1094 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1095 | |
9f5a0d7b | 1096 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1097 | |
1da177e4 LT |
1098 | return conn; |
1099 | } | |
1100 | ||
1da177e4 | 1101 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1102 | |
1103 | /* Find socket with psm and source bdaddr. | |
1104 | * Returns closest match. | |
1105 | */ | |
23691d75 | 1106 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1107 | { |
23691d75 | 1108 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1109 | |
23691d75 | 1110 | read_lock(&chan_list_lock); |
e0f0cb56 | 1111 | |
23691d75 GP |
1112 | list_for_each_entry(c, &chan_list, global_l) { |
1113 | struct sock *sk = c->sk; | |
fe4128e0 | 1114 | |
89bc500e | 1115 | if (state && c->state != state) |
1da177e4 LT |
1116 | continue; |
1117 | ||
23691d75 | 1118 | if (c->psm == psm) { |
1da177e4 | 1119 | /* Exact match. */ |
23691d75 | 1120 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1121 | read_unlock(&chan_list_lock); |
23691d75 GP |
1122 | return c; |
1123 | } | |
1da177e4 LT |
1124 | |
1125 | /* Closest match */ | |
1126 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1127 | c1 = c; |
1da177e4 LT |
1128 | } |
1129 | } | |
1da177e4 | 1130 | |
23691d75 | 1131 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1132 | |
23691d75 | 1133 | return c1; |
1da177e4 LT |
1134 | } |
1135 | ||
cbe8fed4 | 1136 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst) |
1da177e4 | 1137 | { |
5d41ce1d | 1138 | struct sock *sk = chan->sk; |
1da177e4 | 1139 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1140 | struct l2cap_conn *conn; |
1141 | struct hci_conn *hcon; | |
1142 | struct hci_dev *hdev; | |
09ab6f4c | 1143 | __u8 auth_type; |
44d0e48e | 1144 | int err; |
1da177e4 | 1145 | |
f29972de | 1146 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
097db76c | 1147 | __le16_to_cpu(chan->psm)); |
1da177e4 | 1148 | |
af05b30b GP |
1149 | hdev = hci_get_route(dst, src); |
1150 | if (!hdev) | |
1da177e4 LT |
1151 | return -EHOSTUNREACH; |
1152 | ||
09fd0de5 | 1153 | hci_dev_lock(hdev); |
1da177e4 | 1154 | |
6be36555 | 1155 | l2cap_chan_lock(chan); |
03a00194 GP |
1156 | |
1157 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1158 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1159 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1160 | err = -EINVAL; | |
1161 | goto done; | |
1162 | } | |
1163 | ||
1164 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1165 | err = -EINVAL; | |
1166 | goto done; | |
1167 | } | |
1168 | ||
1169 | switch (chan->mode) { | |
1170 | case L2CAP_MODE_BASIC: | |
1171 | break; | |
1172 | case L2CAP_MODE_ERTM: | |
1173 | case L2CAP_MODE_STREAMING: | |
1174 | if (!disable_ertm) | |
1175 | break; | |
1176 | /* fall through */ | |
1177 | default: | |
1178 | err = -ENOTSUPP; | |
1179 | goto done; | |
1180 | } | |
1181 | ||
6be36555 AE |
1182 | lock_sock(sk); |
1183 | ||
03a00194 GP |
1184 | switch (sk->sk_state) { |
1185 | case BT_CONNECT: | |
1186 | case BT_CONNECT2: | |
1187 | case BT_CONFIG: | |
1188 | /* Already connecting */ | |
1189 | err = 0; | |
6be36555 | 1190 | release_sock(sk); |
03a00194 GP |
1191 | goto done; |
1192 | ||
1193 | case BT_CONNECTED: | |
1194 | /* Already connected */ | |
1195 | err = -EISCONN; | |
6be36555 | 1196 | release_sock(sk); |
03a00194 GP |
1197 | goto done; |
1198 | ||
1199 | case BT_OPEN: | |
1200 | case BT_BOUND: | |
1201 | /* Can connect */ | |
1202 | break; | |
1203 | ||
1204 | default: | |
1205 | err = -EBADFD; | |
6be36555 | 1206 | release_sock(sk); |
03a00194 GP |
1207 | goto done; |
1208 | } | |
1209 | ||
1210 | /* Set destination address and psm */ | |
9219b2a0 | 1211 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1212 | |
1213 | release_sock(sk); | |
1214 | ||
03a00194 GP |
1215 | chan->psm = psm; |
1216 | chan->dcid = cid; | |
1da177e4 | 1217 | |
4343478f | 1218 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1219 | |
fe4128e0 | 1220 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1221 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1222 | chan->sec_level, auth_type); |
acd7d370 VT |
1223 | else |
1224 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1225 | chan->sec_level, auth_type); |
acd7d370 | 1226 | |
30e76272 VT |
1227 | if (IS_ERR(hcon)) { |
1228 | err = PTR_ERR(hcon); | |
1da177e4 | 1229 | goto done; |
30e76272 | 1230 | } |
1da177e4 LT |
1231 | |
1232 | conn = l2cap_conn_add(hcon, 0); | |
1233 | if (!conn) { | |
1234 | hci_conn_put(hcon); | |
30e76272 | 1235 | err = -ENOMEM; |
1da177e4 LT |
1236 | goto done; |
1237 | } | |
1238 | ||
1da177e4 LT |
1239 | /* Update source addr of the socket */ |
1240 | bacpy(src, conn->src); | |
1241 | ||
6be36555 | 1242 | l2cap_chan_unlock(chan); |
48454079 | 1243 | l2cap_chan_add(conn, chan); |
6be36555 | 1244 | l2cap_chan_lock(chan); |
48454079 | 1245 | |
6be36555 | 1246 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1247 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1248 | |
1249 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1250 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1251 | __clear_chan_timer(chan); |
d45fc423 | 1252 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1253 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1254 | } else |
fc7f8a7e | 1255 | l2cap_do_start(chan); |
1da177e4 LT |
1256 | } |
1257 | ||
30e76272 VT |
1258 | err = 0; |
1259 | ||
1da177e4 | 1260 | done: |
6be36555 | 1261 | l2cap_chan_unlock(chan); |
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); | |
e90bac06 | 1303 | |
525cd185 | 1304 | BT_DBG("chan %p", chan); |
0e98958d | 1305 | |
6be36555 AE |
1306 | l2cap_chan_lock(chan); |
1307 | ||
2c03a7a4 | 1308 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1309 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1310 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1311 | l2cap_chan_put(chan); |
e90bac06 GP |
1312 | return; |
1313 | } | |
1314 | ||
6a026610 | 1315 | chan->retry_count++; |
1a09bcb9 | 1316 | __set_monitor_timer(chan); |
e90bac06 | 1317 | |
525cd185 | 1318 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1319 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1320 | l2cap_chan_put(chan); |
e90bac06 GP |
1321 | } |
1322 | ||
721c4181 | 1323 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1324 | { |
721c4181 GP |
1325 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1326 | retrans_timer.work); | |
e90bac06 | 1327 | |
49208c9c | 1328 | BT_DBG("chan %p", chan); |
0e98958d | 1329 | |
6be36555 AE |
1330 | l2cap_chan_lock(chan); |
1331 | ||
6a026610 | 1332 | chan->retry_count = 1; |
1a09bcb9 | 1333 | __set_monitor_timer(chan); |
e90bac06 | 1334 | |
e2ab4353 | 1335 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1336 | |
525cd185 | 1337 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1338 | |
1339 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1340 | l2cap_chan_put(chan); |
e90bac06 GP |
1341 | } |
1342 | ||
42e5c802 | 1343 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1344 | { |
1c2acffb | 1345 | struct sk_buff *skb; |
1da177e4 | 1346 | |
58d35f87 | 1347 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1348 | chan->unacked_frames) { |
42e5c802 | 1349 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1350 | break; |
1da177e4 | 1351 | |
58d35f87 | 1352 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1353 | kfree_skb(skb); |
1da177e4 | 1354 | |
6a026610 | 1355 | chan->unacked_frames--; |
1c2acffb | 1356 | } |
1da177e4 | 1357 | |
6a026610 | 1358 | if (!chan->unacked_frames) |
1a09bcb9 | 1359 | __clear_retrans_timer(chan); |
1c2acffb | 1360 | } |
1da177e4 | 1361 | |
67c9e840 | 1362 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1363 | { |
ccbb84af | 1364 | struct sk_buff *skb; |
88843ab0 AE |
1365 | u32 control; |
1366 | u16 fcs; | |
6840ed07 | 1367 | |
58d35f87 | 1368 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1369 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1370 | control |= __set_txseq(chan, chan->next_tx_seq); |
88843ab0 | 1371 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1372 | |
47d1ec61 | 1373 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1374 | fcs = crc16(0, (u8 *)skb->data, |
1375 | skb->len - L2CAP_FCS_SIZE); | |
1376 | put_unaligned_le16(fcs, | |
1377 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1378 | } |
1379 | ||
4343478f | 1380 | l2cap_do_send(chan, skb); |
6840ed07 | 1381 | |
836be934 | 1382 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1383 | } |
6840ed07 GP |
1384 | } |
1385 | ||
fb45de7d | 1386 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1387 | { |
8f17154f | 1388 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1389 | u16 fcs; |
1390 | u32 control; | |
8f17154f | 1391 | |
58d35f87 | 1392 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1393 | if (!skb) |
1394 | return; | |
8f17154f | 1395 | |
d1726b6d | 1396 | while (bt_cb(skb)->tx_seq != tx_seq) { |
58d35f87 | 1397 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1398 | return; |
8f17154f | 1399 | |
d1726b6d SJ |
1400 | skb = skb_queue_next(&chan->tx_q, skb); |
1401 | } | |
8f17154f | 1402 | |
2c03a7a4 GP |
1403 | if (chan->remote_max_tx && |
1404 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1405 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1406 | return; |
1407 | } | |
1408 | ||
1409 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1410 | bt_cb(skb)->retries++; | |
88843ab0 AE |
1411 | |
1412 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1413 | control &= __get_sar_mask(chan); |
3cb123d1 | 1414 | |
e2ab4353 | 1415 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1416 | control |= __set_ctrl_final(chan); |
95ffa978 | 1417 | |
0b209fae | 1418 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1419 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1420 | |
88843ab0 | 1421 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1422 | |
47d1ec61 | 1423 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1424 | fcs = crc16(0, (u8 *)tx_skb->data, |
1425 | tx_skb->len - L2CAP_FCS_SIZE); | |
1426 | put_unaligned_le16(fcs, | |
1427 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1428 | } |
1429 | ||
4343478f | 1430 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1431 | } |
1432 | ||
67c9e840 | 1433 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1434 | { |
1435 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1436 | u16 fcs; |
1437 | u32 control; | |
9a9c6a34 | 1438 | int nsent = 0; |
1c2acffb | 1439 | |
89bc500e | 1440 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1441 | return -ENOTCONN; |
e90bac06 | 1442 | |
58d35f87 | 1443 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1444 | |
2c03a7a4 GP |
1445 | if (chan->remote_max_tx && |
1446 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1447 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1448 | break; |
1449 | } | |
1450 | ||
e420aba3 AE |
1451 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1452 | ||
e90bac06 GP |
1453 | bt_cb(skb)->retries++; |
1454 | ||
88843ab0 | 1455 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1456 | control &= __get_sar_mask(chan); |
95ffa978 | 1457 | |
e2ab4353 | 1458 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1459 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1460 | |
0b209fae | 1461 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1462 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb | 1463 | |
88843ab0 | 1464 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1465 | |
47d1ec61 | 1466 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1467 | fcs = crc16(0, (u8 *)skb->data, |
1468 | tx_skb->len - L2CAP_FCS_SIZE); | |
1469 | put_unaligned_le16(fcs, skb->data + | |
1470 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1471 | } |
1472 | ||
4343478f | 1473 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1474 | |
1a09bcb9 | 1475 | __set_retrans_timer(chan); |
1c2acffb | 1476 | |
42e5c802 | 1477 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
836be934 AE |
1478 | |
1479 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1480 | |
8ed7a0ae | 1481 | if (bt_cb(skb)->retries == 1) { |
6a026610 | 1482 | chan->unacked_frames++; |
930fa4ae SJ |
1483 | |
1484 | if (!nsent++) | |
1485 | __clear_ack_timer(chan); | |
8ed7a0ae | 1486 | } |
23e9fde2 | 1487 | |
6a026610 | 1488 | chan->frames_sent++; |
1c2acffb | 1489 | |
58d35f87 GP |
1490 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1491 | chan->tx_send_head = NULL; | |
1c2acffb | 1492 | else |
58d35f87 | 1493 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
1c2acffb GP |
1494 | } |
1495 | ||
9e917af1 GP |
1496 | return nsent; |
1497 | } | |
1498 | ||
525cd185 | 1499 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1500 | { |
dfc909be GP |
1501 | int ret; |
1502 | ||
58d35f87 GP |
1503 | if (!skb_queue_empty(&chan->tx_q)) |
1504 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1505 | |
42e5c802 | 1506 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1507 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1508 | return ret; |
1509 | } | |
1510 | ||
b17e73bb | 1511 | static void __l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1512 | { |
88843ab0 | 1513 | u32 control = 0; |
9e917af1 | 1514 | |
0b209fae | 1515 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1516 | |
e2ab4353 | 1517 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1518 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1519 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1520 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1521 | return; |
9e917af1 | 1522 | } |
dfc909be | 1523 | |
525cd185 | 1524 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1525 | return; |
1526 | ||
ab784b73 | 1527 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1528 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1529 | } |
1530 | ||
b17e73bb SJ |
1531 | static void l2cap_send_ack(struct l2cap_chan *chan) |
1532 | { | |
1533 | __clear_ack_timer(chan); | |
1534 | __l2cap_send_ack(chan); | |
1535 | } | |
1536 | ||
525cd185 | 1537 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1538 | { |
1539 | struct srej_list *tail; | |
88843ab0 | 1540 | u32 control; |
99b0d4b7 | 1541 | |
ab784b73 | 1542 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1543 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1544 | |
39d5a3ee | 1545 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1546 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1547 | |
525cd185 | 1548 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1549 | } |
1550 | ||
04124681 GP |
1551 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1552 | struct msghdr *msg, int len, | |
1553 | int count, struct sk_buff *skb) | |
1c2acffb | 1554 | { |
0952a57a | 1555 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1556 | struct sk_buff **frag; |
1557 | int err, sent = 0; | |
1da177e4 | 1558 | |
59203a21 | 1559 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1560 | return -EFAULT; |
1da177e4 LT |
1561 | |
1562 | sent += count; | |
1563 | len -= count; | |
1564 | ||
1565 | /* Continuation fragments (no L2CAP header) */ | |
1566 | frag = &skb_shinfo(skb)->frag_list; | |
1567 | while (len) { | |
1568 | count = min_t(unsigned int, conn->mtu, len); | |
1569 | ||
2f7719ce | 1570 | *frag = chan->ops->alloc_skb(chan, count, |
04124681 GP |
1571 | msg->msg_flags & MSG_DONTWAIT, |
1572 | &err); | |
2f7719ce | 1573 | |
1da177e4 | 1574 | if (!*frag) |
0175d629 | 1575 | return err; |
1c2acffb GP |
1576 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1577 | return -EFAULT; | |
1da177e4 | 1578 | |
5e59b791 LAD |
1579 | (*frag)->priority = skb->priority; |
1580 | ||
1da177e4 LT |
1581 | sent += count; |
1582 | len -= count; | |
1583 | ||
1584 | frag = &(*frag)->next; | |
1585 | } | |
1da177e4 LT |
1586 | |
1587 | return sent; | |
1c2acffb | 1588 | } |
1da177e4 | 1589 | |
5e59b791 LAD |
1590 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1591 | struct msghdr *msg, size_t len, | |
1592 | u32 priority) | |
1c2acffb | 1593 | { |
8c1d787b | 1594 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1595 | struct sk_buff *skb; |
03a51213 | 1596 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1597 | struct l2cap_hdr *lh; |
1598 | ||
6d5922b0 | 1599 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1600 | |
1601 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1602 | |
1603 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
04124681 | 1604 | msg->msg_flags & MSG_DONTWAIT, &err); |
2f7719ce | 1605 | |
1c2acffb | 1606 | if (!skb) |
0175d629 | 1607 | return ERR_PTR(err); |
1c2acffb | 1608 | |
5e59b791 LAD |
1609 | skb->priority = priority; |
1610 | ||
1c2acffb GP |
1611 | /* Create L2CAP header */ |
1612 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1613 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1614 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
097db76c | 1615 | put_unaligned(chan->psm, skb_put(skb, 2)); |
1c2acffb | 1616 | |
0952a57a | 1617 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1618 | if (unlikely(err < 0)) { |
1619 | kfree_skb(skb); | |
1620 | return ERR_PTR(err); | |
1621 | } | |
1622 | return skb; | |
1623 | } | |
1624 | ||
5e59b791 LAD |
1625 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1626 | struct msghdr *msg, size_t len, | |
1627 | u32 priority) | |
1c2acffb | 1628 | { |
8c1d787b | 1629 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1630 | struct sk_buff *skb; |
1631 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1632 | struct l2cap_hdr *lh; | |
1633 | ||
6d5922b0 | 1634 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb GP |
1635 | |
1636 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1637 | |
1638 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
04124681 | 1639 | msg->msg_flags & MSG_DONTWAIT, &err); |
2f7719ce | 1640 | |
1c2acffb | 1641 | if (!skb) |
0175d629 | 1642 | return ERR_PTR(err); |
1c2acffb | 1643 | |
5e59b791 LAD |
1644 | skb->priority = priority; |
1645 | ||
1c2acffb GP |
1646 | /* Create L2CAP header */ |
1647 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1648 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1649 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1650 | ||
0952a57a | 1651 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1652 | if (unlikely(err < 0)) { |
1653 | kfree_skb(skb); | |
1654 | return ERR_PTR(err); | |
1655 | } | |
1656 | return skb; | |
1657 | } | |
1658 | ||
ab0ff76d LAD |
1659 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1660 | struct msghdr *msg, size_t len, | |
88843ab0 | 1661 | u32 control, u16 sdulen) |
1c2acffb | 1662 | { |
8c1d787b | 1663 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1664 | struct sk_buff *skb; |
e4ca6d98 | 1665 | int err, count, hlen; |
1c2acffb GP |
1666 | struct l2cap_hdr *lh; |
1667 | ||
6d5922b0 | 1668 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1669 | |
0ee0d208 GP |
1670 | if (!conn) |
1671 | return ERR_PTR(-ENOTCONN); | |
1672 | ||
e4ca6d98 AE |
1673 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1674 | hlen = L2CAP_EXT_HDR_SIZE; | |
1675 | else | |
1676 | hlen = L2CAP_ENH_HDR_SIZE; | |
1677 | ||
c74e560c | 1678 | if (sdulen) |
03a51213 | 1679 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1680 | |
47d1ec61 | 1681 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1682 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1683 | |
1c2acffb | 1684 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
1685 | |
1686 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
1687 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1688 | ||
1c2acffb | 1689 | if (!skb) |
0175d629 | 1690 | return ERR_PTR(err); |
1c2acffb GP |
1691 | |
1692 | /* Create L2CAP header */ | |
1693 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1694 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1695 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 AE |
1696 | |
1697 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1698 | ||
c74e560c | 1699 | if (sdulen) |
03a51213 | 1700 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 1701 | |
0952a57a | 1702 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1703 | if (unlikely(err < 0)) { |
1704 | kfree_skb(skb); | |
1705 | return ERR_PTR(err); | |
1706 | } | |
e90bac06 | 1707 | |
47d1ec61 | 1708 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1709 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1710 | |
e90bac06 | 1711 | bt_cb(skb)->retries = 0; |
1c2acffb | 1712 | return skb; |
1da177e4 LT |
1713 | } |
1714 | ||
67c9e840 | 1715 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1716 | { |
c74e560c GP |
1717 | struct sk_buff *skb; |
1718 | struct sk_buff_head sar_queue; | |
88843ab0 | 1719 | u32 control; |
c74e560c GP |
1720 | size_t size = 0; |
1721 | ||
ff12fd64 | 1722 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1723 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1724 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1725 | if (IS_ERR(skb)) |
1726 | return PTR_ERR(skb); | |
1727 | ||
1728 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1729 | len -= chan->remote_mps; |
1730 | size += chan->remote_mps; | |
c74e560c GP |
1731 | |
1732 | while (len > 0) { | |
1733 | size_t buflen; | |
1734 | ||
2c03a7a4 | 1735 | if (len > chan->remote_mps) { |
7e0ef6ee | 1736 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1737 | buflen = chan->remote_mps; |
c74e560c | 1738 | } else { |
7e0ef6ee | 1739 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1740 | buflen = len; |
1741 | } | |
1742 | ||
47d1ec61 | 1743 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1744 | if (IS_ERR(skb)) { |
1745 | skb_queue_purge(&sar_queue); | |
1746 | return PTR_ERR(skb); | |
1747 | } | |
1748 | ||
1749 | __skb_queue_tail(&sar_queue, skb); | |
1750 | len -= buflen; | |
1751 | size += buflen; | |
c74e560c | 1752 | } |
58d35f87 GP |
1753 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1754 | if (chan->tx_send_head == NULL) | |
1755 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1756 | |
1757 | return size; | |
1758 | } | |
1759 | ||
5e59b791 LAD |
1760 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
1761 | u32 priority) | |
9a91a04a | 1762 | { |
9a91a04a | 1763 | struct sk_buff *skb; |
88843ab0 | 1764 | u32 control; |
9a91a04a GP |
1765 | int err; |
1766 | ||
1767 | /* Connectionless channel */ | |
715ec005 | 1768 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 1769 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
1770 | if (IS_ERR(skb)) |
1771 | return PTR_ERR(skb); | |
1772 | ||
1773 | l2cap_do_send(chan, skb); | |
1774 | return len; | |
1775 | } | |
1776 | ||
1777 | switch (chan->mode) { | |
1778 | case L2CAP_MODE_BASIC: | |
1779 | /* Check outgoing MTU */ | |
1780 | if (len > chan->omtu) | |
1781 | return -EMSGSIZE; | |
1782 | ||
1783 | /* Create a basic PDU */ | |
5e59b791 | 1784 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
1785 | if (IS_ERR(skb)) |
1786 | return PTR_ERR(skb); | |
1787 | ||
1788 | l2cap_do_send(chan, skb); | |
1789 | err = len; | |
1790 | break; | |
1791 | ||
1792 | case L2CAP_MODE_ERTM: | |
1793 | case L2CAP_MODE_STREAMING: | |
1794 | /* Entire SDU fits into one PDU */ | |
1795 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1796 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1797 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1798 | 0); | |
1799 | if (IS_ERR(skb)) | |
1800 | return PTR_ERR(skb); | |
1801 | ||
1802 | __skb_queue_tail(&chan->tx_q, skb); | |
1803 | ||
1804 | if (chan->tx_send_head == NULL) | |
1805 | chan->tx_send_head = skb; | |
1806 | ||
1807 | } else { | |
1808 | /* Segment SDU into multiples PDUs */ | |
1809 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1810 | if (err < 0) | |
1811 | return err; | |
1812 | } | |
1813 | ||
1814 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1815 | l2cap_streaming_send(chan); | |
1816 | err = len; | |
1817 | break; | |
1818 | } | |
1819 | ||
e2ab4353 GP |
1820 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1821 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1822 | err = len; |
1823 | break; | |
1824 | } | |
1825 | ||
1826 | err = l2cap_ertm_send(chan); | |
1827 | if (err >= 0) | |
1828 | err = len; | |
1829 | ||
1830 | break; | |
1831 | ||
1832 | default: | |
1833 | BT_DBG("bad state %1.1x", chan->mode); | |
1834 | err = -EBADFD; | |
1835 | } | |
1836 | ||
1837 | return err; | |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | /* Copy frame to all raw sockets on that connection */ |
1841 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1842 | { | |
1da177e4 | 1843 | struct sk_buff *nskb; |
48454079 | 1844 | struct l2cap_chan *chan; |
1da177e4 LT |
1845 | |
1846 | BT_DBG("conn %p", conn); | |
1847 | ||
3df91ea2 | 1848 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 1849 | |
3df91ea2 | 1850 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 1851 | struct sock *sk = chan->sk; |
715ec005 | 1852 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1853 | continue; |
1854 | ||
1855 | /* Don't send frame to the socket it came from */ | |
1856 | if (skb->sk == sk) | |
1857 | continue; | |
af05b30b GP |
1858 | nskb = skb_clone(skb, GFP_ATOMIC); |
1859 | if (!nskb) | |
1da177e4 LT |
1860 | continue; |
1861 | ||
23070494 | 1862 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1863 | kfree_skb(nskb); |
1864 | } | |
3d57dc68 | 1865 | |
3df91ea2 | 1866 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
1867 | } |
1868 | ||
1869 | /* ---- L2CAP signalling commands ---- */ | |
1870 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1871 | u8 code, u8 ident, u16 dlen, void *data) | |
1872 | { | |
1873 | struct sk_buff *skb, **frag; | |
1874 | struct l2cap_cmd_hdr *cmd; | |
1875 | struct l2cap_hdr *lh; | |
1876 | int len, count; | |
1877 | ||
af05b30b GP |
1878 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1879 | conn, code, ident, dlen); | |
1da177e4 LT |
1880 | |
1881 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1882 | count = min_t(unsigned int, conn->mtu, len); | |
1883 | ||
1884 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1885 | if (!skb) | |
1886 | return NULL; | |
1887 | ||
1888 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1889 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1890 | |
1891 | if (conn->hcon->type == LE_LINK) | |
1892 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1893 | else | |
1894 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1895 | |
1896 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1897 | cmd->code = code; | |
1898 | cmd->ident = ident; | |
aca3192c | 1899 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1900 | |
1901 | if (dlen) { | |
1902 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1903 | memcpy(skb_put(skb, count), data, count); | |
1904 | data += count; | |
1905 | } | |
1906 | ||
1907 | len -= skb->len; | |
1908 | ||
1909 | /* Continuation fragments (no L2CAP header) */ | |
1910 | frag = &skb_shinfo(skb)->frag_list; | |
1911 | while (len) { | |
1912 | count = min_t(unsigned int, conn->mtu, len); | |
1913 | ||
1914 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1915 | if (!*frag) | |
1916 | goto fail; | |
1917 | ||
1918 | memcpy(skb_put(*frag, count), data, count); | |
1919 | ||
1920 | len -= count; | |
1921 | data += count; | |
1922 | ||
1923 | frag = &(*frag)->next; | |
1924 | } | |
1925 | ||
1926 | return skb; | |
1927 | ||
1928 | fail: | |
1929 | kfree_skb(skb); | |
1930 | return NULL; | |
1931 | } | |
1932 | ||
1933 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1934 | { | |
1935 | struct l2cap_conf_opt *opt = *ptr; | |
1936 | int len; | |
1937 | ||
1938 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1939 | *ptr += len; | |
1940 | ||
1941 | *type = opt->type; | |
1942 | *olen = opt->len; | |
1943 | ||
1944 | switch (opt->len) { | |
1945 | case 1: | |
1946 | *val = *((u8 *) opt->val); | |
1947 | break; | |
1948 | ||
1949 | case 2: | |
bfaaeb3e | 1950 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1951 | break; |
1952 | ||
1953 | case 4: | |
bfaaeb3e | 1954 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1955 | break; |
1956 | ||
1957 | default: | |
1958 | *val = (unsigned long) opt->val; | |
1959 | break; | |
1960 | } | |
1961 | ||
1962 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1963 | return len; | |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1967 | { | |
1968 | struct l2cap_conf_opt *opt = *ptr; | |
1969 | ||
1970 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1971 | ||
1972 | opt->type = type; | |
1973 | opt->len = len; | |
1974 | ||
1975 | switch (len) { | |
1976 | case 1: | |
1977 | *((u8 *) opt->val) = val; | |
1978 | break; | |
1979 | ||
1980 | case 2: | |
4f8b691c | 1981 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1982 | break; |
1983 | ||
1984 | case 4: | |
4f8b691c | 1985 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1986 | break; |
1987 | ||
1988 | default: | |
1989 | memcpy(opt->val, (void *) val, len); | |
1990 | break; | |
1991 | } | |
1992 | ||
1993 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1994 | } | |
1995 | ||
f89cef09 AE |
1996 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
1997 | { | |
1998 | struct l2cap_conf_efs efs; | |
1999 | ||
1ec918ce | 2000 | switch (chan->mode) { |
f89cef09 AE |
2001 | case L2CAP_MODE_ERTM: |
2002 | efs.id = chan->local_id; | |
2003 | efs.stype = chan->local_stype; | |
2004 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2005 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2006 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2007 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2008 | break; | |
2009 | ||
2010 | case L2CAP_MODE_STREAMING: | |
2011 | efs.id = 1; | |
2012 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2013 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2014 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2015 | efs.acc_lat = 0; | |
2016 | efs.flush_to = 0; | |
2017 | break; | |
2018 | ||
2019 | default: | |
2020 | return; | |
2021 | } | |
2022 | ||
2023 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2024 | (unsigned long) &efs); | |
2025 | } | |
2026 | ||
721c4181 | 2027 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2028 | { |
721c4181 GP |
2029 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2030 | ack_timer.work); | |
c1b4f43b | 2031 | |
2fb9b3d4 GP |
2032 | BT_DBG("chan %p", chan); |
2033 | ||
6be36555 AE |
2034 | l2cap_chan_lock(chan); |
2035 | ||
b17e73bb | 2036 | __l2cap_send_ack(chan); |
6be36555 AE |
2037 | |
2038 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2039 | |
2040 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2041 | } |
2042 | ||
525cd185 | 2043 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2044 | { |
42e5c802 | 2045 | chan->expected_ack_seq = 0; |
6a026610 | 2046 | chan->unacked_frames = 0; |
42e5c802 | 2047 | chan->buffer_seq = 0; |
6a026610 GP |
2048 | chan->num_acked = 0; |
2049 | chan->frames_sent = 0; | |
0565c1c2 | 2050 | |
721c4181 GP |
2051 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2052 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2053 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2054 | |
f1c6775b | 2055 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2056 | |
39d5a3ee | 2057 | INIT_LIST_HEAD(&chan->srej_l); |
0565c1c2 GP |
2058 | } |
2059 | ||
f2fcfcd6 GP |
2060 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2061 | { | |
2062 | switch (mode) { | |
2063 | case L2CAP_MODE_STREAMING: | |
2064 | case L2CAP_MODE_ERTM: | |
2065 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2066 | return mode; | |
2067 | /* fall through */ | |
2068 | default: | |
2069 | return L2CAP_MODE_BASIC; | |
2070 | } | |
2071 | } | |
2072 | ||
6327eb98 AE |
2073 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2074 | { | |
2075 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2076 | } | |
2077 | ||
f89cef09 AE |
2078 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2079 | { | |
2080 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2081 | } | |
2082 | ||
6327eb98 AE |
2083 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2084 | { | |
2085 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2086 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2087 | /* use extended control field */ |
2088 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2089 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2090 | } else { | |
6327eb98 AE |
2091 | chan->tx_win = min_t(u16, chan->tx_win, |
2092 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2093 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2094 | } | |
6327eb98 AE |
2095 | } |
2096 | ||
710f9b0a | 2097 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2098 | { |
1da177e4 | 2099 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2100 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2101 | void *ptr = req->data; |
c8f79162 | 2102 | u16 size; |
1da177e4 | 2103 | |
49208c9c | 2104 | BT_DBG("chan %p", chan); |
1da177e4 | 2105 | |
73ffa904 | 2106 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2107 | goto done; |
2108 | ||
0c1bc5c6 | 2109 | switch (chan->mode) { |
f2fcfcd6 GP |
2110 | case L2CAP_MODE_STREAMING: |
2111 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2112 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2113 | break; |
85eb53c6 | 2114 | |
f89cef09 AE |
2115 | if (__l2cap_efs_supported(chan)) |
2116 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2117 | ||
2ba13ed6 | 2118 | /* fall through */ |
f2fcfcd6 | 2119 | default: |
8c1d787b | 2120 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2121 | break; |
2122 | } | |
2123 | ||
2124 | done: | |
0c1bc5c6 GP |
2125 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2126 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2127 | |
0c1bc5c6 | 2128 | switch (chan->mode) { |
65c7c491 | 2129 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2130 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2131 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2132 | break; |
2133 | ||
62547752 GP |
2134 | rfc.mode = L2CAP_MODE_BASIC; |
2135 | rfc.txwin_size = 0; | |
2136 | rfc.max_transmit = 0; | |
2137 | rfc.retrans_timeout = 0; | |
2138 | rfc.monitor_timeout = 0; | |
2139 | rfc.max_pdu_size = 0; | |
2140 | ||
63406504 GP |
2141 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2142 | (unsigned long) &rfc); | |
65c7c491 MH |
2143 | break; |
2144 | ||
2145 | case L2CAP_MODE_ERTM: | |
2146 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2147 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2148 | rfc.retrans_timeout = 0; |
2149 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2150 | |
2151 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2152 | L2CAP_EXT_HDR_SIZE - | |
2153 | L2CAP_SDULEN_SIZE - | |
2154 | L2CAP_FCS_SIZE); | |
2155 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2156 | |
6327eb98 AE |
2157 | l2cap_txwin_setup(chan); |
2158 | ||
2159 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2160 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2161 | |
63406504 GP |
2162 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2163 | (unsigned long) &rfc); | |
2164 | ||
f89cef09 AE |
2165 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2166 | l2cap_add_opt_efs(&ptr, chan); | |
2167 | ||
8c1d787b | 2168 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2169 | break; |
2170 | ||
47d1ec61 | 2171 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2172 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2173 | chan->fcs = L2CAP_FCS_NONE; |
2174 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2175 | } |
6327eb98 AE |
2176 | |
2177 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2178 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2179 | chan->tx_win); | |
f2fcfcd6 GP |
2180 | break; |
2181 | ||
2182 | case L2CAP_MODE_STREAMING: | |
2183 | rfc.mode = L2CAP_MODE_STREAMING; | |
2184 | rfc.txwin_size = 0; | |
2185 | rfc.max_transmit = 0; | |
2186 | rfc.retrans_timeout = 0; | |
2187 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2188 | |
2189 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2190 | L2CAP_EXT_HDR_SIZE - | |
2191 | L2CAP_SDULEN_SIZE - | |
2192 | L2CAP_FCS_SIZE); | |
2193 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2194 | |
63406504 GP |
2195 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2196 | (unsigned long) &rfc); | |
2197 | ||
f89cef09 AE |
2198 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2199 | l2cap_add_opt_efs(&ptr, chan); | |
2200 | ||
8c1d787b | 2201 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2202 | break; |
2203 | ||
47d1ec61 | 2204 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2205 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2206 | chan->fcs = L2CAP_FCS_NONE; |
2207 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2208 | } |
65c7c491 MH |
2209 | break; |
2210 | } | |
1da177e4 | 2211 | |
fe4128e0 | 2212 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2213 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2214 | |
2215 | return ptr - data; | |
2216 | } | |
2217 | ||
73ffa904 | 2218 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2219 | { |
5dee9e7c MH |
2220 | struct l2cap_conf_rsp *rsp = data; |
2221 | void *ptr = rsp->data; | |
73ffa904 GP |
2222 | void *req = chan->conf_req; |
2223 | int len = chan->conf_len; | |
5dee9e7c MH |
2224 | int type, hint, olen; |
2225 | unsigned long val; | |
6464f35f | 2226 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2227 | struct l2cap_conf_efs efs; |
2228 | u8 remote_efs = 0; | |
861d6882 | 2229 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2230 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2231 | u16 size; |
1da177e4 | 2232 | |
73ffa904 | 2233 | BT_DBG("chan %p", chan); |
820ae1b8 | 2234 | |
5dee9e7c MH |
2235 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2236 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2237 | |
589d2746 | 2238 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2239 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2240 | |
2241 | switch (type) { | |
2242 | case L2CAP_CONF_MTU: | |
861d6882 | 2243 | mtu = val; |
5dee9e7c MH |
2244 | break; |
2245 | ||
2246 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2247 | chan->flush_to = val; |
5dee9e7c MH |
2248 | break; |
2249 | ||
2250 | case L2CAP_CONF_QOS: | |
2251 | break; | |
2252 | ||
6464f35f MH |
2253 | case L2CAP_CONF_RFC: |
2254 | if (olen == sizeof(rfc)) | |
2255 | memcpy(&rfc, (void *) val, olen); | |
2256 | break; | |
2257 | ||
fcc203c3 GP |
2258 | case L2CAP_CONF_FCS: |
2259 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2260 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2261 | break; |
fcc203c3 | 2262 | |
42dceae2 AE |
2263 | case L2CAP_CONF_EFS: |
2264 | remote_efs = 1; | |
2265 | if (olen == sizeof(efs)) | |
2266 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2267 | break; |
2268 | ||
6327eb98 AE |
2269 | case L2CAP_CONF_EWS: |
2270 | if (!enable_hs) | |
2271 | return -ECONNREFUSED; | |
fcc203c3 | 2272 | |
6327eb98 AE |
2273 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2274 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2275 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2276 | chan->remote_tx_win = val; |
fcc203c3 GP |
2277 | break; |
2278 | ||
5dee9e7c MH |
2279 | default: |
2280 | if (hint) | |
2281 | break; | |
2282 | ||
2283 | result = L2CAP_CONF_UNKNOWN; | |
2284 | *((u8 *) ptr++) = type; | |
2285 | break; | |
2286 | } | |
2287 | } | |
2288 | ||
73ffa904 | 2289 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2290 | goto done; |
2291 | ||
0c1bc5c6 | 2292 | switch (chan->mode) { |
f2fcfcd6 GP |
2293 | case L2CAP_MODE_STREAMING: |
2294 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2295 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2296 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2297 | chan->conn->feat_mask); |
85eb53c6 GP |
2298 | break; |
2299 | } | |
2300 | ||
42dceae2 AE |
2301 | if (remote_efs) { |
2302 | if (__l2cap_efs_supported(chan)) | |
2303 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2304 | else | |
2305 | return -ECONNREFUSED; | |
2306 | } | |
2307 | ||
0c1bc5c6 | 2308 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2309 | return -ECONNREFUSED; |
742e519b | 2310 | |
f2fcfcd6 | 2311 | break; |
f2fcfcd6 GP |
2312 | } |
2313 | ||
2314 | done: | |
0c1bc5c6 | 2315 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2316 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2317 | rfc.mode = chan->mode; |
f2fcfcd6 | 2318 | |
73ffa904 | 2319 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2320 | return -ECONNREFUSED; |
2321 | ||
2322 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2323 | sizeof(rfc), (unsigned long) &rfc); | |
2324 | } | |
2325 | ||
5dee9e7c MH |
2326 | if (result == L2CAP_CONF_SUCCESS) { |
2327 | /* Configure output options and let the other side know | |
2328 | * which ones we don't like. */ | |
2329 | ||
f2fcfcd6 GP |
2330 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2331 | result = L2CAP_CONF_UNACCEPT; | |
2332 | else { | |
0c1bc5c6 | 2333 | chan->omtu = mtu; |
c1360a1c | 2334 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2335 | } |
0c1bc5c6 | 2336 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2337 | |
42dceae2 AE |
2338 | if (remote_efs) { |
2339 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2340 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2341 | efs.stype != chan->local_stype) { | |
2342 | ||
2343 | result = L2CAP_CONF_UNACCEPT; | |
2344 | ||
2345 | if (chan->num_conf_req >= 1) | |
2346 | return -ECONNREFUSED; | |
2347 | ||
2348 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2349 | sizeof(efs), |
42dceae2 | 2350 | (unsigned long) &efs); |
0e8b207e | 2351 | } else { |
3e6b3b95 | 2352 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2353 | result = L2CAP_CONF_PENDING; |
2354 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2355 | } |
2356 | } | |
2357 | ||
f2fcfcd6 GP |
2358 | switch (rfc.mode) { |
2359 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2360 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2361 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2362 | break; |
2363 | ||
2364 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2365 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2366 | chan->remote_tx_win = rfc.txwin_size; | |
2367 | else | |
2368 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2369 | |
2c03a7a4 | 2370 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2371 | |
c8f79162 AE |
2372 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2373 | chan->conn->mtu - | |
2374 | L2CAP_EXT_HDR_SIZE - | |
2375 | L2CAP_SDULEN_SIZE - | |
2376 | L2CAP_FCS_SIZE); | |
2377 | rfc.max_pdu_size = cpu_to_le16(size); | |
2378 | chan->remote_mps = size; | |
f2fcfcd6 | 2379 | |
10467e9e GP |
2380 | rfc.retrans_timeout = |
2381 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2382 | rfc.monitor_timeout = | |
2383 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2384 | |
c1360a1c | 2385 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2386 | |
2387 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2388 | sizeof(rfc), (unsigned long) &rfc); | |
2389 | ||
42dceae2 AE |
2390 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2391 | chan->remote_id = efs.id; | |
2392 | chan->remote_stype = efs.stype; | |
2393 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2394 | chan->remote_flush_to = | |
2395 | le32_to_cpu(efs.flush_to); | |
2396 | chan->remote_acc_lat = | |
2397 | le32_to_cpu(efs.acc_lat); | |
2398 | chan->remote_sdu_itime = | |
2399 | le32_to_cpu(efs.sdu_itime); | |
2400 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2401 | sizeof(efs), (unsigned long) &efs); | |
2402 | } | |
f2fcfcd6 GP |
2403 | break; |
2404 | ||
2405 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2406 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2407 | chan->conn->mtu - | |
2408 | L2CAP_EXT_HDR_SIZE - | |
2409 | L2CAP_SDULEN_SIZE - | |
2410 | L2CAP_FCS_SIZE); | |
2411 | rfc.max_pdu_size = cpu_to_le16(size); | |
2412 | chan->remote_mps = size; | |
f2fcfcd6 | 2413 | |
c1360a1c | 2414 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2415 | |
2416 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2417 | sizeof(rfc), (unsigned long) &rfc); | |
2418 | ||
f2fcfcd6 GP |
2419 | break; |
2420 | ||
2421 | default: | |
5dee9e7c | 2422 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2423 | |
6464f35f | 2424 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2425 | rfc.mode = chan->mode; |
f2fcfcd6 | 2426 | } |
6464f35f | 2427 | |
f2fcfcd6 | 2428 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2429 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2430 | } |
fe4128e0 | 2431 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2432 | rsp->result = cpu_to_le16(result); |
2433 | rsp->flags = cpu_to_le16(0x0000); | |
2434 | ||
2435 | return ptr - data; | |
1da177e4 LT |
2436 | } |
2437 | ||
b4450035 | 2438 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2439 | { |
f2fcfcd6 GP |
2440 | struct l2cap_conf_req *req = data; |
2441 | void *ptr = req->data; | |
2442 | int type, olen; | |
2443 | unsigned long val; | |
36e999a8 | 2444 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 2445 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2446 | |
fe4128e0 | 2447 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2448 | |
2449 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2450 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2451 | ||
2452 | switch (type) { | |
2453 | case L2CAP_CONF_MTU: | |
2454 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2455 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2456 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2457 | } else |
0c1bc5c6 GP |
2458 | chan->imtu = val; |
2459 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2460 | break; |
2461 | ||
2462 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2463 | chan->flush_to = val; |
f2fcfcd6 | 2464 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2465 | 2, chan->flush_to); |
f2fcfcd6 GP |
2466 | break; |
2467 | ||
2468 | case L2CAP_CONF_RFC: | |
2469 | if (olen == sizeof(rfc)) | |
2470 | memcpy(&rfc, (void *)val, olen); | |
2471 | ||
c1360a1c | 2472 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2473 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2474 | return -ECONNREFUSED; |
2475 | ||
47d1ec61 | 2476 | chan->fcs = 0; |
f2fcfcd6 GP |
2477 | |
2478 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2479 | sizeof(rfc), (unsigned long) &rfc); | |
2480 | break; | |
6327eb98 AE |
2481 | |
2482 | case L2CAP_CONF_EWS: | |
2483 | chan->tx_win = min_t(u16, val, | |
2484 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2485 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2486 | chan->tx_win); | |
6327eb98 | 2487 | break; |
66af7aaf AE |
2488 | |
2489 | case L2CAP_CONF_EFS: | |
2490 | if (olen == sizeof(efs)) | |
2491 | memcpy(&efs, (void *)val, olen); | |
2492 | ||
2493 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2494 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2495 | efs.stype != chan->local_stype) | |
2496 | return -ECONNREFUSED; | |
2497 | ||
2498 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2499 | sizeof(efs), (unsigned long) &efs); | |
2500 | break; | |
f2fcfcd6 GP |
2501 | } |
2502 | } | |
2503 | ||
0c1bc5c6 | 2504 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2505 | return -ECONNREFUSED; |
2506 | ||
0c1bc5c6 | 2507 | chan->mode = rfc.mode; |
6c2ea7a8 | 2508 | |
0e8b207e | 2509 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2510 | switch (rfc.mode) { |
2511 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2512 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2513 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2514 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2515 | |
2516 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2517 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2518 | chan->local_sdu_itime = | |
2519 | le32_to_cpu(efs.sdu_itime); | |
2520 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2521 | chan->local_flush_to = | |
2522 | le32_to_cpu(efs.flush_to); | |
2523 | } | |
f2fcfcd6 | 2524 | break; |
66af7aaf | 2525 | |
f2fcfcd6 | 2526 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2527 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2528 | } |
2529 | } | |
2530 | ||
fe4128e0 | 2531 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2532 | req->flags = cpu_to_le16(0x0000); |
2533 | ||
2534 | return ptr - data; | |
2535 | } | |
2536 | ||
fe4128e0 | 2537 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2538 | { |
2539 | struct l2cap_conf_rsp *rsp = data; | |
2540 | void *ptr = rsp->data; | |
1da177e4 | 2541 | |
fe4128e0 | 2542 | BT_DBG("chan %p", chan); |
1da177e4 | 2543 | |
fe4128e0 | 2544 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2545 | rsp->result = cpu_to_le16(result); |
aca3192c | 2546 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2547 | |
2548 | return ptr - data; | |
2549 | } | |
2550 | ||
8c1d787b | 2551 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2552 | { |
2553 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2554 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2555 | u8 buf[128]; |
2556 | ||
fe4128e0 GP |
2557 | rsp.scid = cpu_to_le16(chan->dcid); |
2558 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2559 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2560 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2561 | l2cap_send_cmd(conn, chan->ident, | |
2562 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2563 | ||
c1360a1c | 2564 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2565 | return; |
2566 | ||
710f9b0a GP |
2567 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2568 | l2cap_build_conf_req(chan, buf), buf); | |
2569 | chan->num_conf_req++; | |
2570 | } | |
2571 | ||
47d1ec61 | 2572 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2573 | { |
7b1c0049 GP |
2574 | int type, olen; |
2575 | unsigned long val; | |
2576 | struct l2cap_conf_rfc rfc; | |
2577 | ||
47d1ec61 | 2578 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2579 | |
0c1bc5c6 | 2580 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2581 | return; |
2582 | ||
2583 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2584 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2585 | ||
2586 | switch (type) { | |
2587 | case L2CAP_CONF_RFC: | |
2588 | if (olen == sizeof(rfc)) | |
2589 | memcpy(&rfc, (void *)val, olen); | |
2590 | goto done; | |
2591 | } | |
2592 | } | |
2593 | ||
36e999a8 MM |
2594 | /* Use sane default values in case a misbehaving remote device |
2595 | * did not send an RFC option. | |
2596 | */ | |
2597 | rfc.mode = chan->mode; | |
2598 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
2599 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
2600 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
2601 | ||
2602 | BT_ERR("Expected RFC option was not found, using defaults"); | |
2603 | ||
7b1c0049 GP |
2604 | done: |
2605 | switch (rfc.mode) { | |
2606 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2607 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2608 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2609 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2610 | break; |
2611 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2612 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2613 | } |
2614 | } | |
2615 | ||
4e8402a3 MH |
2616 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2617 | { | |
e2fd318e | 2618 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2619 | |
e2fd318e | 2620 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2621 | return 0; |
2622 | ||
2623 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2624 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 2625 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
2626 | |
2627 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2628 | conn->info_ident = 0; |
984947dc | 2629 | |
4e8402a3 MH |
2630 | l2cap_conn_start(conn); |
2631 | } | |
2632 | ||
2633 | return 0; | |
2634 | } | |
2635 | ||
1da177e4 LT |
2636 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2637 | { | |
1da177e4 LT |
2638 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2639 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2640 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2641 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2642 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2643 | |
2644 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2645 | __le16 psm = req->psm; |
1da177e4 | 2646 | |
097db76c | 2647 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
2648 | |
2649 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2650 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2651 | if (!pchan) { | |
1da177e4 LT |
2652 | result = L2CAP_CR_BAD_PSM; |
2653 | goto sendresp; | |
2654 | } | |
2655 | ||
23691d75 GP |
2656 | parent = pchan->sk; |
2657 | ||
3df91ea2 | 2658 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 2659 | lock_sock(parent); |
e0f0cb56 | 2660 | |
e7c29cb1 MH |
2661 | /* Check if the ACL is secure enough (if not SDP) */ |
2662 | if (psm != cpu_to_le16(0x0001) && | |
2663 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2664 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2665 | result = L2CAP_CR_SEC_BLOCK; |
2666 | goto response; | |
2667 | } | |
2668 | ||
1da177e4 LT |
2669 | result = L2CAP_CR_NO_MEM; |
2670 | ||
2671 | /* Check for backlog size */ | |
2672 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2673 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2674 | goto response; |
2675 | } | |
2676 | ||
80808e43 GP |
2677 | chan = pchan->ops->new_connection(pchan->data); |
2678 | if (!chan) | |
1da177e4 LT |
2679 | goto response; |
2680 | ||
80808e43 GP |
2681 | sk = chan->sk; |
2682 | ||
1da177e4 | 2683 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 2684 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 2685 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2686 | chan->ops->close(chan->data); |
1da177e4 LT |
2687 | goto response; |
2688 | } | |
2689 | ||
2690 | hci_conn_hold(conn->hcon); | |
2691 | ||
1da177e4 LT |
2692 | bacpy(&bt_sk(sk)->src, conn->src); |
2693 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2694 | chan->psm = psm; |
2695 | chan->dcid = scid; | |
1da177e4 | 2696 | |
d1010240 GP |
2697 | bt_accept_enqueue(parent, sk); |
2698 | ||
6be36555 | 2699 | __l2cap_chan_add(conn, chan); |
48454079 | 2700 | |
fe4128e0 | 2701 | dcid = chan->scid; |
1da177e4 | 2702 | |
c9b66675 | 2703 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2704 | |
fc7f8a7e | 2705 | chan->ident = cmd->ident; |
1da177e4 | 2706 | |
984947dc | 2707 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 2708 | if (l2cap_chan_check_security(chan)) { |
f66dc81f | 2709 | if (bt_sk(sk)->defer_setup) { |
0e587be7 | 2710 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2711 | result = L2CAP_CR_PEND; |
2712 | status = L2CAP_CS_AUTHOR_PEND; | |
2713 | parent->sk_data_ready(parent, 0); | |
2714 | } else { | |
0e587be7 | 2715 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2716 | result = L2CAP_CR_SUCCESS; |
2717 | status = L2CAP_CS_NO_INFO; | |
2718 | } | |
79d554a6 | 2719 | } else { |
0e587be7 | 2720 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2721 | result = L2CAP_CR_PEND; |
2722 | status = L2CAP_CS_AUTHEN_PEND; | |
2723 | } | |
2724 | } else { | |
0e587be7 | 2725 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2726 | result = L2CAP_CR_PEND; |
2727 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2728 | } |
2729 | ||
1da177e4 | 2730 | response: |
aa2ac881 | 2731 | release_sock(parent); |
3df91ea2 | 2732 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2733 | |
2734 | sendresp: | |
aca3192c YH |
2735 | rsp.scid = cpu_to_le16(scid); |
2736 | rsp.dcid = cpu_to_le16(dcid); | |
2737 | rsp.result = cpu_to_le16(result); | |
2738 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2739 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2740 | |
2741 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2742 | struct l2cap_info_req info; | |
2743 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2744 | ||
2745 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2746 | conn->info_ident = l2cap_get_ident(conn); | |
2747 | ||
ba13ccd9 | 2748 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
2749 | |
2750 | l2cap_send_cmd(conn, conn->info_ident, | |
2751 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2752 | } | |
2753 | ||
c1360a1c | 2754 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2755 | result == L2CAP_CR_SUCCESS) { |
2756 | u8 buf[128]; | |
c1360a1c | 2757 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2758 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2759 | l2cap_build_conf_req(chan, buf), buf); |
2760 | chan->num_conf_req++; | |
e9aeb2dd GP |
2761 | } |
2762 | ||
1da177e4 LT |
2763 | return 0; |
2764 | } | |
2765 | ||
2766 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2767 | { | |
2768 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2769 | u16 scid, dcid, result, status; | |
48454079 | 2770 | struct l2cap_chan *chan; |
1da177e4 | 2771 | u8 req[128]; |
3df91ea2 | 2772 | int err; |
1da177e4 LT |
2773 | |
2774 | scid = __le16_to_cpu(rsp->scid); | |
2775 | dcid = __le16_to_cpu(rsp->dcid); | |
2776 | result = __le16_to_cpu(rsp->result); | |
2777 | status = __le16_to_cpu(rsp->status); | |
2778 | ||
1b009c98 AE |
2779 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2780 | dcid, scid, result, status); | |
1da177e4 | 2781 | |
3df91ea2 AE |
2782 | mutex_lock(&conn->chan_lock); |
2783 | ||
1da177e4 | 2784 | if (scid) { |
3df91ea2 AE |
2785 | chan = __l2cap_get_chan_by_scid(conn, scid); |
2786 | if (!chan) { | |
2787 | err = -EFAULT; | |
2788 | goto unlock; | |
2789 | } | |
1da177e4 | 2790 | } else { |
3df91ea2 AE |
2791 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
2792 | if (!chan) { | |
2793 | err = -EFAULT; | |
2794 | goto unlock; | |
2795 | } | |
1da177e4 LT |
2796 | } |
2797 | ||
3df91ea2 AE |
2798 | err = 0; |
2799 | ||
6be36555 | 2800 | l2cap_chan_lock(chan); |
48454079 | 2801 | |
1da177e4 LT |
2802 | switch (result) { |
2803 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2804 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2805 | chan->ident = 0; |
fe4128e0 | 2806 | chan->dcid = dcid; |
c1360a1c | 2807 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2808 | |
c1360a1c | 2809 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2810 | break; |
2811 | ||
1da177e4 | 2812 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2813 | l2cap_build_conf_req(chan, req), req); |
2814 | chan->num_conf_req++; | |
1da177e4 LT |
2815 | break; |
2816 | ||
2817 | case L2CAP_CR_PEND: | |
c1360a1c | 2818 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2819 | break; |
2820 | ||
2821 | default: | |
48454079 | 2822 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2823 | break; |
2824 | } | |
2825 | ||
6be36555 | 2826 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
2827 | |
2828 | unlock: | |
2829 | mutex_unlock(&conn->chan_lock); | |
2830 | ||
2831 | return err; | |
1da177e4 LT |
2832 | } |
2833 | ||
47d1ec61 | 2834 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2835 | { |
2836 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2837 | * sides request it. | |
2838 | */ | |
0c1bc5c6 | 2839 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2840 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2841 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2842 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2843 | } |
2844 | ||
88219a0f | 2845 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2846 | { |
2847 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2848 | u16 dcid, flags; | |
2849 | u8 rsp[64]; | |
48454079 | 2850 | struct l2cap_chan *chan; |
5dee9e7c | 2851 | int len; |
1da177e4 LT |
2852 | |
2853 | dcid = __le16_to_cpu(req->dcid); | |
2854 | flags = __le16_to_cpu(req->flags); | |
2855 | ||
2856 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2857 | ||
baa7e1fa | 2858 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2859 | if (!chan) |
1da177e4 LT |
2860 | return -ENOENT; |
2861 | ||
6be36555 | 2862 | l2cap_chan_lock(chan); |
48454079 | 2863 | |
033b1142 | 2864 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2865 | struct l2cap_cmd_rej_cid rej; |
2866 | ||
2867 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2868 | rej.scid = cpu_to_le16(chan->scid); | |
2869 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2870 | |
df6bd743 GP |
2871 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2872 | sizeof(rej), &rej); | |
354f60a9 | 2873 | goto unlock; |
df6bd743 | 2874 | } |
354f60a9 | 2875 | |
5dee9e7c | 2876 | /* Reject if config buffer is too small. */ |
88219a0f | 2877 | len = cmd_len - sizeof(*req); |
7ac28817 | 2878 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2879 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2880 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2881 | L2CAP_CONF_REJECT, flags), rsp); |
2882 | goto unlock; | |
2883 | } | |
2884 | ||
2885 | /* Store config. */ | |
73ffa904 GP |
2886 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2887 | chan->conf_len += len; | |
1da177e4 LT |
2888 | |
2889 | if (flags & 0x0001) { | |
2890 | /* Incomplete config. Send empty response. */ | |
2891 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2892 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2893 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2894 | goto unlock; |
2895 | } | |
2896 | ||
2897 | /* Complete config. */ | |
73ffa904 | 2898 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2899 | if (len < 0) { |
e92c8e70 | 2900 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2901 | goto unlock; |
f2fcfcd6 | 2902 | } |
1da177e4 | 2903 | |
5dee9e7c | 2904 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2905 | chan->num_conf_rsp++; |
5dee9e7c | 2906 | |
5dee9e7c | 2907 | /* Reset config buffer. */ |
73ffa904 | 2908 | chan->conf_len = 0; |
5dee9e7c | 2909 | |
c1360a1c | 2910 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2911 | goto unlock; |
2912 | ||
c1360a1c | 2913 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2914 | set_default_fcs(chan); |
fcc203c3 | 2915 | |
89bc500e | 2916 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2917 | |
42e5c802 GP |
2918 | chan->next_tx_seq = 0; |
2919 | chan->expected_tx_seq = 0; | |
58d35f87 | 2920 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2921 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2922 | l2cap_ertm_init(chan); |
0565c1c2 | 2923 | |
cf4cd009 | 2924 | l2cap_chan_ready(chan); |
876d9484 MH |
2925 | goto unlock; |
2926 | } | |
2927 | ||
c1360a1c | 2928 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2929 | u8 buf[64]; |
1da177e4 | 2930 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2931 | l2cap_build_conf_req(chan, buf), buf); |
2932 | chan->num_conf_req++; | |
1da177e4 LT |
2933 | } |
2934 | ||
0e8b207e AE |
2935 | /* Got Conf Rsp PENDING from remote side and asume we sent |
2936 | Conf Rsp PENDING in the code above */ | |
2937 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
2938 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2939 | ||
2940 | /* check compatibility */ | |
2941 | ||
2942 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2943 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2944 | ||
2945 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2946 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
2947 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
2948 | } | |
2949 | ||
1da177e4 | 2950 | unlock: |
6be36555 | 2951 | l2cap_chan_unlock(chan); |
1da177e4 LT |
2952 | return 0; |
2953 | } | |
2954 | ||
2955 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2956 | { | |
2957 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2958 | u16 scid, flags, result; | |
48454079 | 2959 | struct l2cap_chan *chan; |
7b1c0049 | 2960 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2961 | |
2962 | scid = __le16_to_cpu(rsp->scid); | |
2963 | flags = __le16_to_cpu(rsp->flags); | |
2964 | result = __le16_to_cpu(rsp->result); | |
2965 | ||
af05b30b GP |
2966 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2967 | scid, flags, result); | |
1da177e4 | 2968 | |
baa7e1fa | 2969 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2970 | if (!chan) |
1da177e4 LT |
2971 | return 0; |
2972 | ||
6be36555 | 2973 | l2cap_chan_lock(chan); |
48454079 | 2974 | |
1da177e4 LT |
2975 | switch (result) { |
2976 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2977 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 2978 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
2979 | break; |
2980 | ||
0e8b207e AE |
2981 | case L2CAP_CONF_PENDING: |
2982 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
2983 | ||
2984 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2985 | char buf[64]; | |
2986 | ||
2987 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2988 | buf, &result); | |
2989 | if (len < 0) { | |
2990 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
2991 | goto done; | |
2992 | } | |
2993 | ||
2994 | /* check compatibility */ | |
2995 | ||
2996 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2997 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2998 | ||
2999 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3000 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3001 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3002 | } | |
3003 | goto done; | |
3004 | ||
1da177e4 | 3005 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3006 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3007 | char req[64]; |
3008 | ||
c2c77ec8 | 3009 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3010 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3011 | goto done; |
3012 | } | |
3013 | ||
f2fcfcd6 GP |
3014 | /* throw out any old stored conf requests */ |
3015 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3016 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3017 | req, &result); | |
f2fcfcd6 | 3018 | if (len < 0) { |
e92c8e70 | 3019 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3020 | goto done; |
3021 | } | |
3022 | ||
3023 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3024 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3025 | chan->num_conf_req++; |
f2fcfcd6 GP |
3026 | if (result != L2CAP_CONF_SUCCESS) |
3027 | goto done; | |
3028 | break; | |
1da177e4 LT |
3029 | } |
3030 | ||
8e87d142 | 3031 | default: |
6be36555 | 3032 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3033 | |
ba13ccd9 | 3034 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3035 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3036 | goto done; |
3037 | } | |
3038 | ||
3039 | if (flags & 0x01) | |
3040 | goto done; | |
3041 | ||
c1360a1c | 3042 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3043 | |
c1360a1c | 3044 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3045 | set_default_fcs(chan); |
fcc203c3 | 3046 | |
89bc500e | 3047 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
3048 | chan->next_tx_seq = 0; |
3049 | chan->expected_tx_seq = 0; | |
58d35f87 | 3050 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 3051 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 3052 | l2cap_ertm_init(chan); |
0565c1c2 | 3053 | |
cf4cd009 | 3054 | l2cap_chan_ready(chan); |
1da177e4 LT |
3055 | } |
3056 | ||
3057 | done: | |
6be36555 | 3058 | l2cap_chan_unlock(chan); |
1da177e4 LT |
3059 | return 0; |
3060 | } | |
3061 | ||
3062 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3063 | { | |
3064 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3065 | struct l2cap_disconn_rsp rsp; | |
3066 | u16 dcid, scid; | |
48454079 | 3067 | struct l2cap_chan *chan; |
1da177e4 LT |
3068 | struct sock *sk; |
3069 | ||
3070 | scid = __le16_to_cpu(req->scid); | |
3071 | dcid = __le16_to_cpu(req->dcid); | |
3072 | ||
3073 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3074 | ||
3df91ea2 AE |
3075 | mutex_lock(&conn->chan_lock); |
3076 | ||
3077 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3078 | if (!chan) { | |
3079 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3080 | return 0; |
3df91ea2 | 3081 | } |
1da177e4 | 3082 | |
6be36555 AE |
3083 | l2cap_chan_lock(chan); |
3084 | ||
48454079 GP |
3085 | sk = chan->sk; |
3086 | ||
fe4128e0 GP |
3087 | rsp.dcid = cpu_to_le16(chan->scid); |
3088 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3089 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3090 | ||
6be36555 | 3091 | lock_sock(sk); |
1da177e4 | 3092 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3093 | release_sock(sk); |
1da177e4 | 3094 | |
48454079 | 3095 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3096 | |
3097 | l2cap_chan_unlock(chan); | |
1da177e4 | 3098 | |
ba3bd0ee | 3099 | chan->ops->close(chan->data); |
3df91ea2 AE |
3100 | |
3101 | mutex_unlock(&conn->chan_lock); | |
3102 | ||
1da177e4 LT |
3103 | return 0; |
3104 | } | |
3105 | ||
3106 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3107 | { | |
3108 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3109 | u16 dcid, scid; | |
48454079 | 3110 | struct l2cap_chan *chan; |
1da177e4 LT |
3111 | |
3112 | scid = __le16_to_cpu(rsp->scid); | |
3113 | dcid = __le16_to_cpu(rsp->dcid); | |
3114 | ||
3115 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3116 | ||
3df91ea2 AE |
3117 | mutex_lock(&conn->chan_lock); |
3118 | ||
3119 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3120 | if (!chan) { | |
3121 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3122 | return 0; |
3df91ea2 | 3123 | } |
1da177e4 | 3124 | |
6be36555 | 3125 | l2cap_chan_lock(chan); |
48454079 | 3126 | |
48454079 | 3127 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3128 | |
3129 | l2cap_chan_unlock(chan); | |
1da177e4 | 3130 | |
ba3bd0ee | 3131 | chan->ops->close(chan->data); |
3df91ea2 AE |
3132 | |
3133 | mutex_unlock(&conn->chan_lock); | |
3134 | ||
1da177e4 LT |
3135 | return 0; |
3136 | } | |
3137 | ||
3138 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3139 | { | |
3140 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3141 | u16 type; |
3142 | ||
3143 | type = __le16_to_cpu(req->type); | |
3144 | ||
3145 | BT_DBG("type 0x%4.4x", type); | |
3146 | ||
f0709e03 MH |
3147 | if (type == L2CAP_IT_FEAT_MASK) { |
3148 | u8 buf[8]; | |
44dd46de | 3149 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3150 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3151 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3152 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3153 | if (!disable_ertm) |
fcc203c3 GP |
3154 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3155 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3156 | if (enable_hs) |
6327eb98 AE |
3157 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3158 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3159 | |
1b7bf4ed | 3160 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3161 | l2cap_send_cmd(conn, cmd->ident, |
3162 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3163 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3164 | u8 buf[12]; | |
3165 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3166 | |
3167 | if (enable_hs) | |
3168 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3169 | else | |
3170 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3171 | ||
e1027a7c MH |
3172 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3173 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3174 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3175 | l2cap_send_cmd(conn, cmd->ident, |
3176 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3177 | } else { |
3178 | struct l2cap_info_rsp rsp; | |
3179 | rsp.type = cpu_to_le16(type); | |
3180 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3181 | l2cap_send_cmd(conn, cmd->ident, | |
3182 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3183 | } | |
1da177e4 LT |
3184 | |
3185 | return 0; | |
3186 | } | |
3187 | ||
3188 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3189 | { | |
3190 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3191 | u16 type, result; | |
3192 | ||
3193 | type = __le16_to_cpu(rsp->type); | |
3194 | result = __le16_to_cpu(rsp->result); | |
3195 | ||
3196 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3197 | ||
e90165be AE |
3198 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3199 | if (cmd->ident != conn->info_ident || | |
3200 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3201 | return 0; | |
3202 | ||
17cd3f37 | 3203 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3204 | |
adb08ede VT |
3205 | if (result != L2CAP_IR_SUCCESS) { |
3206 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3207 | conn->info_ident = 0; | |
3208 | ||
3209 | l2cap_conn_start(conn); | |
3210 | ||
3211 | return 0; | |
3212 | } | |
3213 | ||
978c93b9 AE |
3214 | switch (type) { |
3215 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3216 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3217 | |
47ec1dcd | 3218 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3219 | struct l2cap_info_req req; |
3220 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3221 | ||
3222 | conn->info_ident = l2cap_get_ident(conn); | |
3223 | ||
3224 | l2cap_send_cmd(conn, conn->info_ident, | |
3225 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3226 | } else { | |
3227 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3228 | conn->info_ident = 0; | |
3229 | ||
3230 | l2cap_conn_start(conn); | |
3231 | } | |
978c93b9 AE |
3232 | break; |
3233 | ||
3234 | case L2CAP_IT_FIXED_CHAN: | |
3235 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3236 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3237 | conn->info_ident = 0; |
984947dc MH |
3238 | |
3239 | l2cap_conn_start(conn); | |
978c93b9 | 3240 | break; |
984947dc | 3241 | } |
4e8402a3 | 3242 | |
1da177e4 LT |
3243 | return 0; |
3244 | } | |
3245 | ||
f94ff6ff MM |
3246 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3247 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3248 | void *data) | |
3249 | { | |
3250 | struct l2cap_create_chan_req *req = data; | |
3251 | struct l2cap_create_chan_rsp rsp; | |
3252 | u16 psm, scid; | |
3253 | ||
3254 | if (cmd_len != sizeof(*req)) | |
3255 | return -EPROTO; | |
3256 | ||
3257 | if (!enable_hs) | |
3258 | return -EINVAL; | |
3259 | ||
3260 | psm = le16_to_cpu(req->psm); | |
3261 | scid = le16_to_cpu(req->scid); | |
3262 | ||
3263 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3264 | ||
3265 | /* Placeholder: Always reject */ | |
3266 | rsp.dcid = 0; | |
3267 | rsp.scid = cpu_to_le16(scid); | |
3268 | rsp.result = L2CAP_CR_NO_MEM; | |
3269 | rsp.status = L2CAP_CS_NO_INFO; | |
3270 | ||
3271 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3272 | sizeof(rsp), &rsp); | |
3273 | ||
3274 | return 0; | |
3275 | } | |
3276 | ||
3277 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3278 | struct l2cap_cmd_hdr *cmd, void *data) | |
3279 | { | |
3280 | BT_DBG("conn %p", conn); | |
3281 | ||
3282 | return l2cap_connect_rsp(conn, cmd, data); | |
3283 | } | |
3284 | ||
8d5a04a1 MM |
3285 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3286 | u16 icid, u16 result) | |
3287 | { | |
3288 | struct l2cap_move_chan_rsp rsp; | |
3289 | ||
3290 | BT_DBG("icid %d, result %d", icid, result); | |
3291 | ||
3292 | rsp.icid = cpu_to_le16(icid); | |
3293 | rsp.result = cpu_to_le16(result); | |
3294 | ||
3295 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3296 | } | |
3297 | ||
3298 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3299 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3300 | { | |
3301 | struct l2cap_move_chan_cfm cfm; | |
3302 | u8 ident; | |
3303 | ||
3304 | BT_DBG("icid %d, result %d", icid, result); | |
3305 | ||
3306 | ident = l2cap_get_ident(conn); | |
3307 | if (chan) | |
3308 | chan->ident = ident; | |
3309 | ||
3310 | cfm.icid = cpu_to_le16(icid); | |
3311 | cfm.result = cpu_to_le16(result); | |
3312 | ||
3313 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3314 | } | |
3315 | ||
3316 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3317 | u16 icid) | |
3318 | { | |
3319 | struct l2cap_move_chan_cfm_rsp rsp; | |
3320 | ||
3321 | BT_DBG("icid %d", icid); | |
3322 | ||
3323 | rsp.icid = cpu_to_le16(icid); | |
3324 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3325 | } | |
3326 | ||
3327 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3328 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3329 | { | |
3330 | struct l2cap_move_chan_req *req = data; | |
3331 | u16 icid = 0; | |
3332 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3333 | ||
3334 | if (cmd_len != sizeof(*req)) | |
3335 | return -EPROTO; | |
3336 | ||
3337 | icid = le16_to_cpu(req->icid); | |
3338 | ||
3339 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3340 | ||
3341 | if (!enable_hs) | |
3342 | return -EINVAL; | |
3343 | ||
3344 | /* Placeholder: Always refuse */ | |
3345 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3346 | ||
3347 | return 0; | |
3348 | } | |
3349 | ||
3350 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3351 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3352 | { | |
3353 | struct l2cap_move_chan_rsp *rsp = data; | |
3354 | u16 icid, result; | |
3355 | ||
3356 | if (cmd_len != sizeof(*rsp)) | |
3357 | return -EPROTO; | |
3358 | ||
3359 | icid = le16_to_cpu(rsp->icid); | |
3360 | result = le16_to_cpu(rsp->result); | |
3361 | ||
3362 | BT_DBG("icid %d, result %d", icid, result); | |
3363 | ||
3364 | /* Placeholder: Always unconfirmed */ | |
3365 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3366 | ||
3367 | return 0; | |
3368 | } | |
3369 | ||
3370 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3371 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3372 | { | |
3373 | struct l2cap_move_chan_cfm *cfm = data; | |
3374 | u16 icid, result; | |
3375 | ||
3376 | if (cmd_len != sizeof(*cfm)) | |
3377 | return -EPROTO; | |
3378 | ||
3379 | icid = le16_to_cpu(cfm->icid); | |
3380 | result = le16_to_cpu(cfm->result); | |
3381 | ||
3382 | BT_DBG("icid %d, result %d", icid, result); | |
3383 | ||
3384 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3385 | ||
3386 | return 0; | |
3387 | } | |
3388 | ||
3389 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3390 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3391 | { | |
3392 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3393 | u16 icid; | |
3394 | ||
3395 | if (cmd_len != sizeof(*rsp)) | |
3396 | return -EPROTO; | |
3397 | ||
3398 | icid = le16_to_cpu(rsp->icid); | |
3399 | ||
3400 | BT_DBG("icid %d", icid); | |
3401 | ||
3402 | return 0; | |
3403 | } | |
3404 | ||
e2174ca4 | 3405 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3406 | u16 to_multiplier) |
3407 | { | |
3408 | u16 max_latency; | |
3409 | ||
3410 | if (min > max || min < 6 || max > 3200) | |
3411 | return -EINVAL; | |
3412 | ||
3413 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3414 | return -EINVAL; | |
3415 | ||
3416 | if (max >= to_multiplier * 8) | |
3417 | return -EINVAL; | |
3418 | ||
3419 | max_latency = (to_multiplier * 8 / max) - 1; | |
3420 | if (latency > 499 || latency > max_latency) | |
3421 | return -EINVAL; | |
3422 | ||
3423 | return 0; | |
3424 | } | |
3425 | ||
3426 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3427 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3428 | { | |
3429 | struct hci_conn *hcon = conn->hcon; | |
3430 | struct l2cap_conn_param_update_req *req; | |
3431 | struct l2cap_conn_param_update_rsp rsp; | |
3432 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3433 | int err; |
de73115a CT |
3434 | |
3435 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3436 | return -EINVAL; | |
3437 | ||
3438 | cmd_len = __le16_to_cpu(cmd->len); | |
3439 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3440 | return -EPROTO; | |
3441 | ||
3442 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3443 | min = __le16_to_cpu(req->min); |
3444 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3445 | latency = __le16_to_cpu(req->latency); |
3446 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3447 | ||
3448 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3449 | min, max, latency, to_multiplier); | |
3450 | ||
3451 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3452 | |
3453 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3454 | if (err) | |
de73115a CT |
3455 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3456 | else | |
3457 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3458 | ||
3459 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3460 | sizeof(rsp), &rsp); | |
3461 | ||
2ce603eb CT |
3462 | if (!err) |
3463 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3464 | ||
de73115a CT |
3465 | return 0; |
3466 | } | |
3467 | ||
3300d9a9 CT |
3468 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3469 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3470 | { | |
3471 | int err = 0; | |
3472 | ||
3473 | switch (cmd->code) { | |
3474 | case L2CAP_COMMAND_REJ: | |
3475 | l2cap_command_rej(conn, cmd, data); | |
3476 | break; | |
3477 | ||
3478 | case L2CAP_CONN_REQ: | |
3479 | err = l2cap_connect_req(conn, cmd, data); | |
3480 | break; | |
3481 | ||
3482 | case L2CAP_CONN_RSP: | |
3483 | err = l2cap_connect_rsp(conn, cmd, data); | |
3484 | break; | |
3485 | ||
3486 | case L2CAP_CONF_REQ: | |
3487 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3488 | break; | |
3489 | ||
3490 | case L2CAP_CONF_RSP: | |
3491 | err = l2cap_config_rsp(conn, cmd, data); | |
3492 | break; | |
3493 | ||
3494 | case L2CAP_DISCONN_REQ: | |
3495 | err = l2cap_disconnect_req(conn, cmd, data); | |
3496 | break; | |
3497 | ||
3498 | case L2CAP_DISCONN_RSP: | |
3499 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3500 | break; | |
3501 | ||
3502 | case L2CAP_ECHO_REQ: | |
3503 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3504 | break; | |
3505 | ||
3506 | case L2CAP_ECHO_RSP: | |
3507 | break; | |
3508 | ||
3509 | case L2CAP_INFO_REQ: | |
3510 | err = l2cap_information_req(conn, cmd, data); | |
3511 | break; | |
3512 | ||
3513 | case L2CAP_INFO_RSP: | |
3514 | err = l2cap_information_rsp(conn, cmd, data); | |
3515 | break; | |
3516 | ||
f94ff6ff MM |
3517 | case L2CAP_CREATE_CHAN_REQ: |
3518 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3519 | break; | |
3520 | ||
3521 | case L2CAP_CREATE_CHAN_RSP: | |
3522 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3523 | break; | |
3524 | ||
8d5a04a1 MM |
3525 | case L2CAP_MOVE_CHAN_REQ: |
3526 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3527 | break; | |
3528 | ||
3529 | case L2CAP_MOVE_CHAN_RSP: | |
3530 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3531 | break; | |
3532 | ||
3533 | case L2CAP_MOVE_CHAN_CFM: | |
3534 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3535 | break; | |
3536 | ||
3537 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3538 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3539 | break; | |
3540 | ||
3300d9a9 CT |
3541 | default: |
3542 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3543 | err = -EINVAL; | |
3544 | break; | |
3545 | } | |
3546 | ||
3547 | return err; | |
3548 | } | |
3549 | ||
3550 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3551 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3552 | { | |
3553 | switch (cmd->code) { | |
3554 | case L2CAP_COMMAND_REJ: | |
3555 | return 0; | |
3556 | ||
3557 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3558 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3559 | |
3560 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3561 | return 0; | |
3562 | ||
3563 | default: | |
3564 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3565 | return -EINVAL; | |
3566 | } | |
3567 | } | |
3568 | ||
3569 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3570 | struct sk_buff *skb) | |
1da177e4 LT |
3571 | { |
3572 | u8 *data = skb->data; | |
3573 | int len = skb->len; | |
3574 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3575 | int err; |
1da177e4 LT |
3576 | |
3577 | l2cap_raw_recv(conn, skb); | |
3578 | ||
3579 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3580 | u16 cmd_len; |
1da177e4 LT |
3581 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3582 | data += L2CAP_CMD_HDR_SIZE; | |
3583 | len -= L2CAP_CMD_HDR_SIZE; | |
3584 | ||
88219a0f | 3585 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3586 | |
88219a0f | 3587 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3588 | |
88219a0f | 3589 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3590 | BT_DBG("corrupted command"); |
3591 | break; | |
3592 | } | |
3593 | ||
3300d9a9 CT |
3594 | if (conn->hcon->type == LE_LINK) |
3595 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3596 | else | |
3597 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3598 | |
3599 | if (err) { | |
e2fd318e | 3600 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3601 | |
3602 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3603 | |
3604 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3605 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3606 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3607 | } | |
3608 | ||
88219a0f AV |
3609 | data += cmd_len; |
3610 | len -= cmd_len; | |
1da177e4 LT |
3611 | } |
3612 | ||
3613 | kfree_skb(skb); | |
3614 | } | |
3615 | ||
47d1ec61 | 3616 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3617 | { |
3618 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3619 | int hdr_size; |
3620 | ||
3621 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3622 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3623 | else | |
3624 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3625 | |
47d1ec61 | 3626 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3627 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3628 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3629 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3630 | ||
3631 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3632 | return -EBADMSG; |
fcc203c3 GP |
3633 | } |
3634 | return 0; | |
3635 | } | |
3636 | ||
525cd185 | 3637 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3638 | { |
88843ab0 | 3639 | u32 control = 0; |
d5392c8f | 3640 | |
6a026610 | 3641 | chan->frames_sent = 0; |
d5392c8f | 3642 | |
0b209fae | 3643 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3644 | |
e2ab4353 | 3645 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3646 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3647 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3648 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3649 | } |
3650 | ||
e2ab4353 | 3651 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3652 | l2cap_retransmit_frames(chan); |
d5392c8f | 3653 | |
525cd185 | 3654 | l2cap_ertm_send(chan); |
d5392c8f | 3655 | |
e2ab4353 | 3656 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3657 | chan->frames_sent == 0) { |
ab784b73 | 3658 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3659 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3660 | } |
3661 | } | |
3662 | ||
fb45de7d | 3663 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3664 | { |
3665 | struct sk_buff *next_skb; | |
bfbacc11 | 3666 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3667 | |
3668 | bt_cb(skb)->tx_seq = tx_seq; | |
3669 | bt_cb(skb)->sar = sar; | |
3670 | ||
f1c6775b | 3671 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3672 | |
836be934 | 3673 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 3674 | |
039d9572 | 3675 | while (next_skb) { |
9b53350d JPRV |
3676 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3677 | return -EINVAL; | |
3678 | ||
836be934 AE |
3679 | next_tx_seq_offset = __seq_offset(chan, |
3680 | bt_cb(next_skb)->tx_seq, chan->buffer_seq); | |
bfbacc11 JPRV |
3681 | |
3682 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3683 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3684 | return 0; |
8f17154f GP |
3685 | } |
3686 | ||
f1c6775b | 3687 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
3688 | next_skb = NULL; |
3689 | else | |
3690 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
3691 | } | |
8f17154f | 3692 | |
f1c6775b | 3693 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3694 | |
3695 | return 0; | |
8f17154f GP |
3696 | } |
3697 | ||
84084a31 MM |
3698 | static void append_skb_frag(struct sk_buff *skb, |
3699 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3700 | { |
84084a31 MM |
3701 | /* skb->len reflects data in skb as well as all fragments |
3702 | * skb->data_len reflects only data in fragments | |
3703 | */ | |
3704 | if (!skb_has_frag_list(skb)) | |
3705 | skb_shinfo(skb)->frag_list = new_frag; | |
3706 | ||
3707 | new_frag->next = NULL; | |
3708 | ||
3709 | (*last_frag)->next = new_frag; | |
3710 | *last_frag = new_frag; | |
3711 | ||
3712 | skb->len += new_frag->len; | |
3713 | skb->data_len += new_frag->len; | |
3714 | skb->truesize += new_frag->truesize; | |
3715 | } | |
3716 | ||
88843ab0 | 3717 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
3718 | { |
3719 | int err = -EINVAL; | |
18778a63 | 3720 | |
7e0ef6ee AE |
3721 | switch (__get_ctrl_sar(chan, control)) { |
3722 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3723 | if (chan->sdu) |
3724 | break; | |
18778a63 | 3725 | |
84084a31 MM |
3726 | err = chan->ops->recv(chan->data, skb); |
3727 | break; | |
18778a63 | 3728 | |
7e0ef6ee | 3729 | case L2CAP_SAR_START: |
84084a31 MM |
3730 | if (chan->sdu) |
3731 | break; | |
18778a63 | 3732 | |
6f61fd47 | 3733 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 3734 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 3735 | |
84084a31 MM |
3736 | if (chan->sdu_len > chan->imtu) { |
3737 | err = -EMSGSIZE; | |
3738 | break; | |
3739 | } | |
1890d36b | 3740 | |
84084a31 MM |
3741 | if (skb->len >= chan->sdu_len) |
3742 | break; | |
18778a63 | 3743 | |
84084a31 MM |
3744 | chan->sdu = skb; |
3745 | chan->sdu_last_frag = skb; | |
18778a63 | 3746 | |
84084a31 MM |
3747 | skb = NULL; |
3748 | err = 0; | |
18778a63 GP |
3749 | break; |
3750 | ||
7e0ef6ee | 3751 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3752 | if (!chan->sdu) |
84084a31 | 3753 | break; |
18778a63 | 3754 | |
84084a31 MM |
3755 | append_skb_frag(chan->sdu, skb, |
3756 | &chan->sdu_last_frag); | |
3757 | skb = NULL; | |
18778a63 | 3758 | |
84084a31 MM |
3759 | if (chan->sdu->len >= chan->sdu_len) |
3760 | break; | |
4178ba46 | 3761 | |
84084a31 | 3762 | err = 0; |
18778a63 GP |
3763 | break; |
3764 | ||
7e0ef6ee | 3765 | case L2CAP_SAR_END: |
6f61fd47 | 3766 | if (!chan->sdu) |
84084a31 | 3767 | break; |
18778a63 | 3768 | |
84084a31 MM |
3769 | append_skb_frag(chan->sdu, skb, |
3770 | &chan->sdu_last_frag); | |
3771 | skb = NULL; | |
4178ba46 | 3772 | |
84084a31 MM |
3773 | if (chan->sdu->len != chan->sdu_len) |
3774 | break; | |
18778a63 | 3775 | |
84084a31 | 3776 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3777 | |
84084a31 MM |
3778 | if (!err) { |
3779 | /* Reassembly complete */ | |
3780 | chan->sdu = NULL; | |
3781 | chan->sdu_last_frag = NULL; | |
3782 | chan->sdu_len = 0; | |
1890d36b | 3783 | } |
18778a63 GP |
3784 | break; |
3785 | } | |
3786 | ||
84084a31 MM |
3787 | if (err) { |
3788 | kfree_skb(skb); | |
3789 | kfree_skb(chan->sdu); | |
3790 | chan->sdu = NULL; | |
3791 | chan->sdu_last_frag = NULL; | |
3792 | chan->sdu_len = 0; | |
3793 | } | |
18778a63 | 3794 | |
84084a31 | 3795 | return err; |
18778a63 GP |
3796 | } |
3797 | ||
26f880d2 | 3798 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3799 | { |
26f880d2 | 3800 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3801 | |
26f880d2 MM |
3802 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3803 | ||
77f918bc | 3804 | __set_ack_timer(chan); |
26f880d2 MM |
3805 | } |
3806 | ||
3807 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3808 | { | |
88843ab0 | 3809 | u32 control; |
712132eb | 3810 | |
e2ab4353 | 3811 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3812 | goto done; |
3813 | ||
0b209fae | 3814 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 3815 | control |= __set_ctrl_poll(chan); |
ab784b73 | 3816 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3817 | l2cap_send_sframe(chan, control); |
6a026610 | 3818 | chan->retry_count = 1; |
712132eb | 3819 | |
1a09bcb9 GP |
3820 | __clear_retrans_timer(chan); |
3821 | __set_monitor_timer(chan); | |
712132eb | 3822 | |
e2ab4353 | 3823 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3824 | |
3825 | done: | |
e2ab4353 GP |
3826 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3827 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3828 | |
49208c9c | 3829 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3830 | } |
3831 | ||
e328140f | 3832 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3833 | { |
e328140f MM |
3834 | if (chan->mode == L2CAP_MODE_ERTM) { |
3835 | if (busy) | |
3836 | l2cap_ertm_enter_local_busy(chan); | |
3837 | else | |
3838 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3839 | } |
1890d36b GP |
3840 | } |
3841 | ||
fb45de7d | 3842 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3843 | { |
3844 | struct sk_buff *skb; | |
88843ab0 | 3845 | u32 control; |
8f17154f | 3846 | |
e328140f MM |
3847 | while ((skb = skb_peek(&chan->srej_q)) && |
3848 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3849 | int err; | |
3850 | ||
8f17154f GP |
3851 | if (bt_cb(skb)->tx_seq != tx_seq) |
3852 | break; | |
3853 | ||
f1c6775b | 3854 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3855 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3856 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3857 | |
3858 | if (err < 0) { | |
3859 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3860 | break; | |
3861 | } | |
3862 | ||
836be934 AE |
3863 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
3864 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
3865 | } |
3866 | } | |
3867 | ||
fb45de7d | 3868 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3869 | { |
8f17154f | 3870 | struct srej_list *l, *tmp; |
88843ab0 | 3871 | u32 control; |
8f17154f | 3872 | |
39d5a3ee | 3873 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3874 | if (l->tx_seq == tx_seq) { |
3875 | list_del(&l->list); | |
3876 | kfree(l); | |
3877 | return; | |
3878 | } | |
ab784b73 | 3879 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3880 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3881 | l2cap_send_sframe(chan, control); |
8f17154f | 3882 | list_del(&l->list); |
39d5a3ee | 3883 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3884 | } |
3885 | } | |
3886 | ||
aef89f21 | 3887 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3888 | { |
8f17154f | 3889 | struct srej_list *new; |
88843ab0 | 3890 | u32 control; |
8f17154f | 3891 | |
42e5c802 | 3892 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3893 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3894 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3895 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3896 | |
3897 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
3898 | if (!new) |
3899 | return -ENOMEM; | |
3900 | ||
42e5c802 | 3901 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
3902 | |
3903 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
3904 | ||
39d5a3ee | 3905 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3906 | } |
836be934 AE |
3907 | |
3908 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
3909 | |
3910 | return 0; | |
8f17154f GP |
3911 | } |
3912 | ||
88843ab0 | 3913 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 3914 | { |
fb45de7d | 3915 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3916 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3917 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3918 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3919 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3920 | int err = 0; |
3921 | ||
88843ab0 | 3922 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 3923 | tx_seq, rx_control); |
1c2acffb | 3924 | |
03f6715d | 3925 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 3926 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3927 | __clear_monitor_timer(chan); |
6a026610 | 3928 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3929 | __set_retrans_timer(chan); |
e2ab4353 | 3930 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3931 | } |
3932 | ||
42e5c802 GP |
3933 | chan->expected_ack_seq = req_seq; |
3934 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3935 | |
836be934 | 3936 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
3937 | |
3938 | /* invalid tx_seq */ | |
47d1ec61 | 3939 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3940 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3941 | goto drop; |
3942 | } | |
3943 | ||
77f918bc SJ |
3944 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
3945 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) | |
3946 | l2cap_send_ack(chan); | |
1890d36b | 3947 | goto drop; |
77f918bc | 3948 | } |
1890d36b | 3949 | |
02f1b641 MM |
3950 | if (tx_seq == chan->expected_tx_seq) |
3951 | goto expected; | |
3952 | ||
e2ab4353 | 3953 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3954 | struct srej_list *first; |
30afb5b2 | 3955 | |
39d5a3ee | 3956 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3957 | struct srej_list, list); |
3958 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3959 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3960 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3961 | |
3962 | list_del(&first->list); | |
3963 | kfree(first); | |
3964 | ||
39d5a3ee | 3965 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3966 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3967 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3968 | l2cap_send_ack(chan); |
49208c9c | 3969 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3970 | } |
3971 | } else { | |
3972 | struct srej_list *l; | |
9b53350d JPRV |
3973 | |
3974 | /* duplicated tx_seq */ | |
42e5c802 | 3975 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3976 | goto drop; |
8f17154f | 3977 | |
39d5a3ee | 3978 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3979 | if (l->tx_seq == tx_seq) { |
525cd185 | 3980 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3981 | return 0; |
3982 | } | |
3983 | } | |
aef89f21 SJ |
3984 | |
3985 | err = l2cap_send_srejframe(chan, tx_seq); | |
3986 | if (err < 0) { | |
3987 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3988 | return err; | |
3989 | } | |
30afb5b2 GP |
3990 | } |
3991 | } else { | |
836be934 AE |
3992 | expected_tx_seq_offset = __seq_offset(chan, |
3993 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
3994 | |
3995 | /* duplicated tx_seq */ | |
3996 | if (tx_seq_offset < expected_tx_seq_offset) | |
3997 | goto drop; | |
3998 | ||
e2ab4353 | 3999 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 4000 | |
49208c9c | 4001 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 4002 | |
39d5a3ee | 4003 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 4004 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 4005 | |
f1c6775b | 4006 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 4007 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 4008 | |
0ef3ef0f SJ |
4009 | /* Set P-bit only if there are some I-frames to ack. */ |
4010 | if (__clear_ack_timer(chan)) | |
4011 | set_bit(CONN_SEND_PBIT, &chan->conn_state); | |
ef54fd93 | 4012 | |
aef89f21 SJ |
4013 | err = l2cap_send_srejframe(chan, tx_seq); |
4014 | if (err < 0) { | |
4015 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4016 | return err; | |
4017 | } | |
1c2acffb | 4018 | } |
30afb5b2 GP |
4019 | return 0; |
4020 | ||
8f17154f | 4021 | expected: |
836be934 | 4022 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 4023 | |
e2ab4353 | 4024 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
4025 | bt_cb(skb)->tx_seq = tx_seq; |
4026 | bt_cb(skb)->sar = sar; | |
f1c6775b | 4027 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
4028 | return 0; |
4029 | } | |
4030 | ||
84084a31 | 4031 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
4032 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
4033 | ||
e328140f MM |
4034 | if (err < 0) { |
4035 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4036 | return err; | |
4037 | } | |
2ece3684 | 4038 | |
03f6715d | 4039 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4040 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4041 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
4042 | } |
4043 | ||
c1b4f43b | 4044 | |
6a026610 GP |
4045 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
4046 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 4047 | l2cap_send_ack(chan); |
4d611e4d GP |
4048 | else |
4049 | __set_ack_timer(chan); | |
9e917af1 | 4050 | |
8f17154f | 4051 | return 0; |
9b53350d JPRV |
4052 | |
4053 | drop: | |
4054 | kfree_skb(skb); | |
4055 | return 0; | |
1c2acffb GP |
4056 | } |
4057 | ||
88843ab0 | 4058 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 4059 | { |
88843ab0 | 4060 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 4061 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 4062 | |
0b209fae | 4063 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 4064 | l2cap_drop_acked_frames(chan); |
1c2acffb | 4065 | |
e3781735 | 4066 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
4067 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
4068 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
4069 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 4070 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4071 | __set_retrans_timer(chan); |
05fbd89d | 4072 | |
e2ab4353 | 4073 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4074 | l2cap_send_srejtail(chan); |
05fbd89d | 4075 | } else { |
525cd185 | 4076 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4077 | } |
1d8f5d16 | 4078 | |
03f6715d | 4079 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4080 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4081 | |
e2ab4353 | 4082 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4083 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4084 | |
e072745f | 4085 | } else { |
e2ab4353 | 4086 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4087 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4088 | __set_retrans_timer(chan); |
1c2acffb | 4089 | |
e2ab4353 GP |
4090 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4091 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4092 | l2cap_send_ack(chan); |
894718a6 | 4093 | else |
525cd185 | 4094 | l2cap_ertm_send(chan); |
e072745f GP |
4095 | } |
4096 | } | |
2246b2f1 | 4097 | |
88843ab0 | 4098 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4099 | { |
0b209fae | 4100 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4101 | |
88843ab0 | 4102 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4103 | |
e2ab4353 | 4104 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4105 | |
42e5c802 GP |
4106 | chan->expected_ack_seq = tx_seq; |
4107 | l2cap_drop_acked_frames(chan); | |
e072745f | 4108 | |
03f6715d | 4109 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4110 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4111 | l2cap_retransmit_frames(chan); |
e072745f | 4112 | } else { |
525cd185 | 4113 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4114 | |
e2ab4353 GP |
4115 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4116 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4117 | } |
4118 | } | |
88843ab0 | 4119 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4120 | { |
0b209fae | 4121 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4122 | |
88843ab0 | 4123 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4124 | |
e2ab4353 | 4125 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4126 | |
e3781735 | 4127 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4128 | chan->expected_ack_seq = tx_seq; |
4129 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4130 | |
e2ab4353 | 4131 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4132 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4133 | |
525cd185 | 4134 | l2cap_ertm_send(chan); |
dfc909be | 4135 | |
e2ab4353 | 4136 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4137 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4138 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4139 | } |
03f6715d | 4140 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4141 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4142 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4143 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4144 | else |
525cd185 | 4145 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4146 | } else { |
525cd185 | 4147 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4148 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4149 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4150 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4151 | } |
e072745f GP |
4152 | } |
4153 | } | |
4154 | ||
88843ab0 | 4155 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4156 | { |
0b209fae | 4157 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4158 | |
88843ab0 | 4159 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4160 | |
e2ab4353 | 4161 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4162 | chan->expected_ack_seq = tx_seq; |
4163 | l2cap_drop_acked_frames(chan); | |
e072745f | 4164 | |
e3781735 | 4165 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4166 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4167 | |
e2ab4353 | 4168 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4169 | __clear_retrans_timer(chan); |
e3781735 | 4170 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4171 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4172 | return; |
e072745f | 4173 | } |
99b0d4b7 | 4174 | |
e3781735 | 4175 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4176 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4177 | } else { |
4178 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4179 | l2cap_send_sframe(chan, rx_control); | |
4180 | } | |
e072745f GP |
4181 | } |
4182 | ||
88843ab0 | 4183 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4184 | { |
88843ab0 | 4185 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4186 | |
03f6715d | 4187 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4188 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4189 | __clear_monitor_timer(chan); |
6a026610 | 4190 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4191 | __set_retrans_timer(chan); |
e2ab4353 | 4192 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4193 | } |
4194 | ||
ab784b73 AE |
4195 | switch (__get_ctrl_super(chan, rx_control)) { |
4196 | case L2CAP_SUPER_RR: | |
525cd185 | 4197 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4198 | break; |
4199 | ||
ab784b73 | 4200 | case L2CAP_SUPER_REJ: |
525cd185 | 4201 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4202 | break; |
2246b2f1 | 4203 | |
ab784b73 | 4204 | case L2CAP_SUPER_SREJ: |
525cd185 | 4205 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4206 | break; |
4207 | ||
ab784b73 | 4208 | case L2CAP_SUPER_RNR: |
525cd185 | 4209 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4210 | break; |
4211 | } | |
4212 | ||
faaebd19 | 4213 | kfree_skb(skb); |
1c2acffb GP |
4214 | return 0; |
4215 | } | |
4216 | ||
cad8f1d0 | 4217 | static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
218bb9df | 4218 | { |
88843ab0 | 4219 | u32 control; |
0b209fae | 4220 | u16 req_seq; |
218bb9df GP |
4221 | int len, next_tx_seq_offset, req_seq_offset; |
4222 | ||
88843ab0 AE |
4223 | control = __get_control(chan, skb->data); |
4224 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4225 | len = skb->len; |
4226 | ||
4227 | /* | |
4228 | * We can just drop the corrupted I-frame here. | |
4229 | * Receiver will miss it and start proper recovery | |
4230 | * procedures and ask retransmission. | |
4231 | */ | |
47d1ec61 | 4232 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4233 | goto drop; |
4234 | ||
793c2f1c | 4235 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4236 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4237 | |
47d1ec61 | 4238 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4239 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4240 | |
47d1ec61 | 4241 | if (len > chan->mps) { |
8c1d787b | 4242 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4243 | goto drop; |
4244 | } | |
4245 | ||
0b209fae | 4246 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4247 | |
836be934 AE |
4248 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4249 | ||
4250 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4251 | chan->expected_ack_seq); | |
218bb9df GP |
4252 | |
4253 | /* check for invalid req-seq */ | |
4254 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4255 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4256 | goto drop; |
4257 | } | |
4258 | ||
793c2f1c | 4259 | if (!__is_sframe(chan, control)) { |
218bb9df | 4260 | if (len < 0) { |
8c1d787b | 4261 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4262 | goto drop; |
4263 | } | |
4264 | ||
525cd185 | 4265 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4266 | } else { |
4267 | if (len != 0) { | |
4268 | BT_ERR("%d", len); | |
8c1d787b | 4269 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4270 | goto drop; |
4271 | } | |
4272 | ||
525cd185 | 4273 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4274 | } |
4275 | ||
4276 | return 0; | |
4277 | ||
4278 | drop: | |
4279 | kfree_skb(skb); | |
4280 | return 0; | |
4281 | } | |
4282 | ||
1da177e4 LT |
4283 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4284 | { | |
48454079 | 4285 | struct l2cap_chan *chan; |
88843ab0 | 4286 | u32 control; |
fb45de7d | 4287 | u16 tx_seq; |
218bb9df | 4288 | int len; |
1da177e4 | 4289 | |
baa7e1fa | 4290 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4291 | if (!chan) { |
1da177e4 | 4292 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 4293 | /* Drop packet and return */ |
3379013b | 4294 | kfree_skb(skb); |
6be36555 | 4295 | return 0; |
1da177e4 LT |
4296 | } |
4297 | ||
6be36555 | 4298 | l2cap_chan_lock(chan); |
6840ed07 | 4299 | |
49208c9c | 4300 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4301 | |
89bc500e | 4302 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4303 | goto drop; |
4304 | ||
0c1bc5c6 | 4305 | switch (chan->mode) { |
1c2acffb GP |
4306 | case L2CAP_MODE_BASIC: |
4307 | /* If socket recv buffers overflows we drop data here | |
4308 | * which is *bad* because L2CAP has to be reliable. | |
4309 | * But we don't have any other choice. L2CAP doesn't | |
4310 | * provide flow control mechanism. */ | |
1da177e4 | 4311 | |
0c1bc5c6 | 4312 | if (chan->imtu < skb->len) |
1c2acffb | 4313 | goto drop; |
1da177e4 | 4314 | |
23070494 | 4315 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4316 | goto done; |
4317 | break; | |
4318 | ||
4319 | case L2CAP_MODE_ERTM: | |
5ef8cb9e | 4320 | l2cap_ertm_data_rcv(chan, skb); |
1c2acffb | 4321 | |
fcafde2e | 4322 | goto done; |
1c2acffb | 4323 | |
6840ed07 | 4324 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4325 | control = __get_control(chan, skb->data); |
4326 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4327 | len = skb->len; |
4328 | ||
47d1ec61 | 4329 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4330 | goto drop; |
4331 | ||
7e0ef6ee | 4332 | if (__is_sar_start(chan, control)) |
03a51213 | 4333 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4334 | |
47d1ec61 | 4335 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4336 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4337 | |
793c2f1c | 4338 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4339 | goto drop; |
4340 | ||
fb45de7d | 4341 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4342 | |
84084a31 MM |
4343 | if (chan->expected_tx_seq != tx_seq) { |
4344 | /* Frame(s) missing - must discard partial SDU */ | |
4345 | kfree_skb(chan->sdu); | |
4346 | chan->sdu = NULL; | |
4347 | chan->sdu_last_frag = NULL; | |
4348 | chan->sdu_len = 0; | |
6840ed07 | 4349 | |
84084a31 MM |
4350 | /* TODO: Notify userland of missing data */ |
4351 | } | |
4352 | ||
836be934 | 4353 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4354 | |
4355 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4356 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4357 | |
4358 | goto done; | |
4359 | ||
1c2acffb | 4360 | default: |
0c1bc5c6 | 4361 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4362 | break; |
4363 | } | |
1da177e4 LT |
4364 | |
4365 | drop: | |
4366 | kfree_skb(skb); | |
4367 | ||
4368 | done: | |
6be36555 | 4369 | l2cap_chan_unlock(chan); |
0139418c | 4370 | |
1da177e4 LT |
4371 | return 0; |
4372 | } | |
4373 | ||
8e036fc3 | 4374 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4375 | { |
23691d75 | 4376 | struct l2cap_chan *chan; |
1da177e4 | 4377 | |
23691d75 GP |
4378 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
4379 | if (!chan) | |
1da177e4 LT |
4380 | goto drop; |
4381 | ||
5b4cedaa | 4382 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4383 | |
89bc500e | 4384 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4385 | goto drop; |
4386 | ||
e13e21dc | 4387 | if (chan->imtu < skb->len) |
1da177e4 LT |
4388 | goto drop; |
4389 | ||
23070494 | 4390 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4391 | return 0; |
1da177e4 LT |
4392 | |
4393 | drop: | |
4394 | kfree_skb(skb); | |
4395 | ||
1da177e4 LT |
4396 | return 0; |
4397 | } | |
4398 | ||
9f69bda6 GP |
4399 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
4400 | { | |
23691d75 | 4401 | struct l2cap_chan *chan; |
9f69bda6 | 4402 | |
23691d75 GP |
4403 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4404 | if (!chan) | |
9f69bda6 GP |
4405 | goto drop; |
4406 | ||
5b4cedaa | 4407 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 4408 | |
89bc500e | 4409 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4410 | goto drop; |
4411 | ||
e13e21dc | 4412 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4413 | goto drop; |
4414 | ||
23070494 | 4415 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4416 | return 0; |
9f69bda6 GP |
4417 | |
4418 | drop: | |
4419 | kfree_skb(skb); | |
4420 | ||
9f69bda6 GP |
4421 | return 0; |
4422 | } | |
4423 | ||
1da177e4 LT |
4424 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4425 | { | |
4426 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4427 | u16 cid, len; |
4428 | __le16 psm; | |
1da177e4 LT |
4429 | |
4430 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4431 | cid = __le16_to_cpu(lh->cid); | |
4432 | len = __le16_to_cpu(lh->len); | |
4433 | ||
1c2acffb GP |
4434 | if (len != skb->len) { |
4435 | kfree_skb(skb); | |
4436 | return; | |
4437 | } | |
4438 | ||
1da177e4 LT |
4439 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4440 | ||
4441 | switch (cid) { | |
3300d9a9 | 4442 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4443 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4444 | l2cap_sig_channel(conn, skb); |
4445 | break; | |
4446 | ||
8db4dc46 | 4447 | case L2CAP_CID_CONN_LESS: |
097db76c | 4448 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
4449 | skb_pull(skb, 2); |
4450 | l2cap_conless_channel(conn, psm, skb); | |
4451 | break; | |
4452 | ||
9f69bda6 GP |
4453 | case L2CAP_CID_LE_DATA: |
4454 | l2cap_att_channel(conn, cid, skb); | |
4455 | break; | |
4456 | ||
b501d6a1 AB |
4457 | case L2CAP_CID_SMP: |
4458 | if (smp_sig_channel(conn, skb)) | |
4459 | l2cap_conn_del(conn->hcon, EACCES); | |
4460 | break; | |
4461 | ||
1da177e4 LT |
4462 | default: |
4463 | l2cap_data_channel(conn, cid, skb); | |
4464 | break; | |
4465 | } | |
4466 | } | |
4467 | ||
4468 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4469 | ||
686ebf28 | 4470 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
4471 | { |
4472 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4473 | struct l2cap_chan *c; |
1da177e4 | 4474 | |
1da177e4 LT |
4475 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
4476 | ||
4477 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4478 | read_lock(&chan_list_lock); |
4479 | list_for_each_entry(c, &chan_list, global_l) { | |
4480 | struct sock *sk = c->sk; | |
4343478f | 4481 | |
89bc500e | 4482 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4483 | continue; |
4484 | ||
4485 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4486 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4487 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4488 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4489 | exact++; |
2af6b9d5 MH |
4490 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4491 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4492 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4493 | lm2 |= HCI_LM_MASTER; |
4494 | } | |
1da177e4 | 4495 | } |
23691d75 | 4496 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4497 | |
4498 | return exact ? lm1 : lm2; | |
4499 | } | |
4500 | ||
686ebf28 | 4501 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 4502 | { |
0139418c MH |
4503 | struct l2cap_conn *conn; |
4504 | ||
1da177e4 LT |
4505 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4506 | ||
1da177e4 | 4507 | if (!status) { |
1da177e4 LT |
4508 | conn = l2cap_conn_add(hcon, status); |
4509 | if (conn) | |
4510 | l2cap_conn_ready(conn); | |
0139418c | 4511 | } else |
e175072f | 4512 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4513 | |
4514 | return 0; | |
4515 | } | |
4516 | ||
686ebf28 | 4517 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
4518 | { |
4519 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4520 | ||
4521 | BT_DBG("hcon %p", hcon); | |
4522 | ||
686ebf28 | 4523 | if (!conn) |
9f5a0d7b | 4524 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4525 | return conn->disc_reason; |
4526 | } | |
4527 | ||
686ebf28 | 4528 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
4529 | { |
4530 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4531 | ||
e175072f | 4532 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
4533 | return 0; |
4534 | } | |
4535 | ||
4343478f | 4536 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4537 | { |
715ec005 | 4538 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4539 | return; |
4540 | ||
f62e4323 | 4541 | if (encrypt == 0x00) { |
4343478f | 4542 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 | 4543 | __clear_chan_timer(chan); |
ba13ccd9 | 4544 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4545 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4546 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4547 | } else { |
4343478f | 4548 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4549 | __clear_chan_timer(chan); |
f62e4323 MH |
4550 | } |
4551 | } | |
4552 | ||
686ebf28 | 4553 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4554 | { |
0139418c | 4555 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4556 | struct l2cap_chan *chan; |
1da177e4 | 4557 | |
0139418c | 4558 | if (!conn) |
1da177e4 | 4559 | return 0; |
0139418c | 4560 | |
1da177e4 LT |
4561 | BT_DBG("conn %p", conn); |
4562 | ||
160dc6ac VCG |
4563 | if (hcon->type == LE_LINK) { |
4564 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 4565 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
4566 | } |
4567 | ||
3df91ea2 | 4568 | mutex_lock(&conn->chan_lock); |
1da177e4 | 4569 | |
3df91ea2 | 4570 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 4571 | l2cap_chan_lock(chan); |
1da177e4 | 4572 | |
f1cb9af5 VCG |
4573 | BT_DBG("chan->scid %d", chan->scid); |
4574 | ||
4575 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4576 | if (!status && encrypt) { | |
4577 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 4578 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
4579 | } |
4580 | ||
6be36555 | 4581 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
4582 | continue; |
4583 | } | |
4584 | ||
c1360a1c | 4585 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 4586 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
4587 | continue; |
4588 | } | |
4589 | ||
89bc500e GP |
4590 | if (!status && (chan->state == BT_CONNECTED || |
4591 | chan->state == BT_CONFIG)) { | |
4343478f | 4592 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 4593 | l2cap_chan_unlock(chan); |
9719f8af MH |
4594 | continue; |
4595 | } | |
4596 | ||
89bc500e | 4597 | if (chan->state == BT_CONNECT) { |
b1235d79 | 4598 | if (!status) { |
9b27f350 | 4599 | l2cap_send_conn_req(chan); |
b1235d79 | 4600 | } else { |
c9b66675 | 4601 | __clear_chan_timer(chan); |
ba13ccd9 | 4602 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4603 | } |
89bc500e | 4604 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 4605 | struct sock *sk = chan->sk; |
b1235d79 | 4606 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4607 | __u16 res, stat; |
1da177e4 | 4608 | |
6be36555 AE |
4609 | lock_sock(sk); |
4610 | ||
b1235d79 | 4611 | if (!status) { |
df3c3931 JH |
4612 | if (bt_sk(sk)->defer_setup) { |
4613 | struct sock *parent = bt_sk(sk)->parent; | |
4614 | res = L2CAP_CR_PEND; | |
4615 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4616 | if (parent) |
4617 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4618 | } else { |
0e587be7 | 4619 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4620 | res = L2CAP_CR_SUCCESS; |
4621 | stat = L2CAP_CS_NO_INFO; | |
4622 | } | |
b1235d79 | 4623 | } else { |
0e587be7 | 4624 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 4625 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4626 | res = L2CAP_CR_SEC_BLOCK; |
4627 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4628 | } |
4629 | ||
6be36555 AE |
4630 | release_sock(sk); |
4631 | ||
fe4128e0 GP |
4632 | rsp.scid = cpu_to_le16(chan->dcid); |
4633 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4634 | rsp.result = cpu_to_le16(res); |
4635 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4636 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4637 | sizeof(rsp), &rsp); | |
b1235d79 | 4638 | } |
1da177e4 | 4639 | |
6be36555 | 4640 | l2cap_chan_unlock(chan); |
1da177e4 LT |
4641 | } |
4642 | ||
3df91ea2 | 4643 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 4644 | |
1da177e4 LT |
4645 | return 0; |
4646 | } | |
4647 | ||
686ebf28 | 4648 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
4649 | { |
4650 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4651 | ||
5a08ecce AE |
4652 | if (!conn) |
4653 | conn = l2cap_conn_add(hcon, 0); | |
4654 | ||
4655 | if (!conn) | |
1da177e4 LT |
4656 | goto drop; |
4657 | ||
4658 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4659 | ||
e702112f | 4660 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4661 | struct l2cap_hdr *hdr; |
48454079 | 4662 | struct l2cap_chan *chan; |
89794813 | 4663 | u16 cid; |
1da177e4 LT |
4664 | int len; |
4665 | ||
4666 | if (conn->rx_len) { | |
4667 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4668 | kfree_skb(conn->rx_skb); | |
4669 | conn->rx_skb = NULL; | |
4670 | conn->rx_len = 0; | |
4671 | l2cap_conn_unreliable(conn, ECOMM); | |
4672 | } | |
4673 | ||
aae7fe22 AE |
4674 | /* Start fragment always begin with Basic L2CAP header */ |
4675 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4676 | BT_ERR("Frame is too short (len %d)", skb->len); |
4677 | l2cap_conn_unreliable(conn, ECOMM); | |
4678 | goto drop; | |
4679 | } | |
4680 | ||
4681 | hdr = (struct l2cap_hdr *) skb->data; | |
4682 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4683 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4684 | |
4685 | if (len == skb->len) { | |
4686 | /* Complete frame received */ | |
4687 | l2cap_recv_frame(conn, skb); | |
4688 | return 0; | |
4689 | } | |
4690 | ||
4691 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4692 | ||
4693 | if (skb->len > len) { | |
4694 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4695 | skb->len, len); | |
4696 | l2cap_conn_unreliable(conn, ECOMM); | |
4697 | goto drop; | |
4698 | } | |
4699 | ||
baa7e1fa | 4700 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4701 | |
48454079 GP |
4702 | if (chan && chan->sk) { |
4703 | struct sock *sk = chan->sk; | |
3df91ea2 | 4704 | lock_sock(sk); |
89794813 | 4705 | |
0c1bc5c6 | 4706 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4707 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4708 | "MTU %d)", len, | |
0c1bc5c6 | 4709 | chan->imtu); |
aa2ac881 | 4710 | release_sock(sk); |
48454079 GP |
4711 | l2cap_conn_unreliable(conn, ECOMM); |
4712 | goto drop; | |
4713 | } | |
aa2ac881 | 4714 | release_sock(sk); |
48454079 | 4715 | } |
89794813 | 4716 | |
1da177e4 | 4717 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4718 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4719 | if (!conn->rx_skb) | |
1da177e4 LT |
4720 | goto drop; |
4721 | ||
d626f62b | 4722 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4723 | skb->len); |
1da177e4 LT |
4724 | conn->rx_len = len - skb->len; |
4725 | } else { | |
4726 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4727 | ||
4728 | if (!conn->rx_len) { | |
4729 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4730 | l2cap_conn_unreliable(conn, ECOMM); | |
4731 | goto drop; | |
4732 | } | |
4733 | ||
4734 | if (skb->len > conn->rx_len) { | |
4735 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4736 | skb->len, conn->rx_len); | |
4737 | kfree_skb(conn->rx_skb); | |
4738 | conn->rx_skb = NULL; | |
4739 | conn->rx_len = 0; | |
4740 | l2cap_conn_unreliable(conn, ECOMM); | |
4741 | goto drop; | |
4742 | } | |
4743 | ||
d626f62b | 4744 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4745 | skb->len); |
1da177e4 LT |
4746 | conn->rx_len -= skb->len; |
4747 | ||
4748 | if (!conn->rx_len) { | |
4749 | /* Complete frame received */ | |
4750 | l2cap_recv_frame(conn, conn->rx_skb); | |
4751 | conn->rx_skb = NULL; | |
4752 | } | |
4753 | } | |
4754 | ||
4755 | drop: | |
4756 | kfree_skb(skb); | |
4757 | return 0; | |
4758 | } | |
4759 | ||
aef7d97c | 4760 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4761 | { |
23691d75 | 4762 | struct l2cap_chan *c; |
1da177e4 | 4763 | |
333055f2 | 4764 | read_lock(&chan_list_lock); |
1da177e4 | 4765 | |
23691d75 GP |
4766 | list_for_each_entry(c, &chan_list, global_l) { |
4767 | struct sock *sk = c->sk; | |
101545f6 | 4768 | |
903d343e | 4769 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4770 | batostr(&bt_sk(sk)->src), |
4771 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4772 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4773 | c->scid, c->dcid, c->imtu, c->omtu, |
4774 | c->sec_level, c->mode); | |
61e1b4b7 | 4775 | } |
1da177e4 | 4776 | |
333055f2 | 4777 | read_unlock(&chan_list_lock); |
1da177e4 | 4778 | |
aef7d97c | 4779 | return 0; |
1da177e4 LT |
4780 | } |
4781 | ||
aef7d97c MH |
4782 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4783 | { | |
4784 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4785 | } | |
4786 | ||
4787 | static const struct file_operations l2cap_debugfs_fops = { | |
4788 | .open = l2cap_debugfs_open, | |
4789 | .read = seq_read, | |
4790 | .llseek = seq_lseek, | |
4791 | .release = single_release, | |
4792 | }; | |
4793 | ||
4794 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4795 | |
64274518 | 4796 | int __init l2cap_init(void) |
1da177e4 LT |
4797 | { |
4798 | int err; | |
be9d1227 | 4799 | |
bb58f747 | 4800 | err = l2cap_init_sockets(); |
1da177e4 LT |
4801 | if (err < 0) |
4802 | return err; | |
4803 | ||
aef7d97c MH |
4804 | if (bt_debugfs) { |
4805 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4806 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4807 | if (!l2cap_debugfs) | |
4808 | BT_ERR("Failed to create L2CAP debug file"); | |
4809 | } | |
1da177e4 | 4810 | |
1da177e4 | 4811 | return 0; |
1da177e4 LT |
4812 | } |
4813 | ||
64274518 | 4814 | void l2cap_exit(void) |
1da177e4 | 4815 | { |
aef7d97c | 4816 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 4817 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4818 | } |
4819 | ||
d1c4a17d GP |
4820 | module_param(disable_ertm, bool, 0644); |
4821 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |