Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 57 | #include <net/bluetooth/smp.h> |
1da177e4 | 58 | |
bb58f747 | 59 | int disable_ertm; |
a5fd6f30 | 60 | int enable_hs; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 63 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
74 | struct l2cap_chan *chan, int err); | |
1da177e4 | 75 | |
218bb9df GP |
76 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
77 | ||
0139418c | 78 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
79 | |
80 | static inline void chan_hold(struct l2cap_chan *c) | |
81 | { | |
82 | atomic_inc(&c->refcnt); | |
83 | } | |
84 | ||
85 | static inline void chan_put(struct l2cap_chan *c) | |
86 | { | |
87 | if (atomic_dec_and_test(&c->refcnt)) | |
88 | kfree(c); | |
89 | } | |
90 | ||
baa7e1fa | 91 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 92 | { |
48454079 | 93 | struct l2cap_chan *c; |
baa7e1fa GP |
94 | |
95 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 96 | if (c->dcid == cid) |
baa7e1fa | 97 | return c; |
0139418c | 98 | } |
baa7e1fa GP |
99 | return NULL; |
100 | ||
0139418c MH |
101 | } |
102 | ||
baa7e1fa | 103 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 104 | { |
48454079 | 105 | struct l2cap_chan *c; |
baa7e1fa GP |
106 | |
107 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 108 | if (c->scid == cid) |
baa7e1fa | 109 | return c; |
0139418c | 110 | } |
baa7e1fa | 111 | return NULL; |
0139418c MH |
112 | } |
113 | ||
114 | /* Find channel with given SCID. | |
115 | * Returns locked socket */ | |
baa7e1fa | 116 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 117 | { |
48454079 | 118 | struct l2cap_chan *c; |
baa7e1fa GP |
119 | |
120 | read_lock(&conn->chan_lock); | |
121 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
122 | if (c) |
123 | bh_lock_sock(c->sk); | |
baa7e1fa | 124 | read_unlock(&conn->chan_lock); |
48454079 | 125 | return c; |
0139418c MH |
126 | } |
127 | ||
baa7e1fa | 128 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 129 | { |
48454079 | 130 | struct l2cap_chan *c; |
baa7e1fa GP |
131 | |
132 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 133 | if (c->ident == ident) |
baa7e1fa | 134 | return c; |
0139418c | 135 | } |
baa7e1fa | 136 | return NULL; |
0139418c MH |
137 | } |
138 | ||
baa7e1fa | 139 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 140 | { |
48454079 | 141 | struct l2cap_chan *c; |
baa7e1fa GP |
142 | |
143 | read_lock(&conn->chan_lock); | |
144 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
145 | if (c) |
146 | bh_lock_sock(c->sk); | |
baa7e1fa | 147 | read_unlock(&conn->chan_lock); |
48454079 | 148 | return c; |
0139418c MH |
149 | } |
150 | ||
23691d75 | 151 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 152 | { |
23691d75 | 153 | struct l2cap_chan *c; |
9e4425ff | 154 | |
23691d75 GP |
155 | list_for_each_entry(c, &chan_list, global_l) { |
156 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
9e4425ff GP |
157 | goto found; |
158 | } | |
159 | ||
23691d75 | 160 | c = NULL; |
9e4425ff | 161 | found: |
23691d75 | 162 | return c; |
9e4425ff GP |
163 | } |
164 | ||
165 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
166 | { | |
73b2ec18 GP |
167 | int err; |
168 | ||
23691d75 | 169 | write_lock_bh(&chan_list_lock); |
9e4425ff | 170 | |
23691d75 | 171 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
172 | err = -EADDRINUSE; |
173 | goto done; | |
9e4425ff GP |
174 | } |
175 | ||
73b2ec18 GP |
176 | if (psm) { |
177 | chan->psm = psm; | |
178 | chan->sport = psm; | |
179 | err = 0; | |
180 | } else { | |
181 | u16 p; | |
182 | ||
183 | err = -EINVAL; | |
184 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 185 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
186 | chan->psm = cpu_to_le16(p); |
187 | chan->sport = cpu_to_le16(p); | |
188 | err = 0; | |
189 | break; | |
190 | } | |
191 | } | |
9e4425ff | 192 | |
73b2ec18 | 193 | done: |
23691d75 | 194 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 195 | return err; |
9e4425ff GP |
196 | } |
197 | ||
198 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
199 | { | |
23691d75 | 200 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
201 | |
202 | chan->scid = scid; | |
203 | ||
23691d75 | 204 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
baa7e1fa | 209 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 210 | { |
8db4dc46 | 211 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 212 | |
8db4dc46 | 213 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 214 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
215 | return cid; |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
c9b66675 | 221 | static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout) |
ab07801d | 222 | { |
774e5651 | 223 | BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout); |
89bc500e | 224 | |
942ecc9c | 225 | if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout))) |
774e5651 | 226 | chan_hold(chan); |
ab07801d GP |
227 | } |
228 | ||
c9b66675 | 229 | static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer) |
ab07801d | 230 | { |
774e5651 | 231 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 232 | |
774e5651 MM |
233 | if (timer_pending(timer) && del_timer(timer)) |
234 | chan_put(chan); | |
ab07801d GP |
235 | } |
236 | ||
89bc500e GP |
237 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
238 | { | |
239 | chan->state = state; | |
240 | chan->ops->state_change(chan->data, state); | |
241 | } | |
242 | ||
ab07801d GP |
243 | static void l2cap_chan_timeout(unsigned long arg) |
244 | { | |
245 | struct l2cap_chan *chan = (struct l2cap_chan *) arg; | |
246 | struct sock *sk = chan->sk; | |
247 | int reason; | |
248 | ||
89bc500e | 249 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d GP |
250 | |
251 | bh_lock_sock(sk); | |
252 | ||
253 | if (sock_owned_by_user(sk)) { | |
254 | /* sk is owned by user. Try again later */ | |
c9b66675 | 255 | __set_chan_timer(chan, HZ / 5); |
ab07801d | 256 | bh_unlock_sock(sk); |
71ba0e56 | 257 | chan_put(chan); |
ab07801d GP |
258 | return; |
259 | } | |
260 | ||
89bc500e | 261 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 262 | reason = ECONNREFUSED; |
89bc500e | 263 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
264 | chan->sec_level != BT_SECURITY_SDP) |
265 | reason = ECONNREFUSED; | |
266 | else | |
267 | reason = ETIMEDOUT; | |
268 | ||
0f852724 | 269 | l2cap_chan_close(chan, reason); |
ab07801d GP |
270 | |
271 | bh_unlock_sock(sk); | |
272 | ||
ba3bd0ee | 273 | chan->ops->close(chan->data); |
71ba0e56 | 274 | chan_put(chan); |
ab07801d GP |
275 | } |
276 | ||
23691d75 | 277 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
278 | { |
279 | struct l2cap_chan *chan; | |
280 | ||
281 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
282 | if (!chan) | |
283 | return NULL; | |
284 | ||
285 | chan->sk = sk; | |
286 | ||
23691d75 GP |
287 | write_lock_bh(&chan_list_lock); |
288 | list_add(&chan->global_l, &chan_list); | |
289 | write_unlock_bh(&chan_list_lock); | |
290 | ||
ab07801d GP |
291 | setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); |
292 | ||
89bc500e GP |
293 | chan->state = BT_OPEN; |
294 | ||
71ba0e56 GP |
295 | atomic_set(&chan->refcnt, 1); |
296 | ||
48454079 GP |
297 | return chan; |
298 | } | |
299 | ||
23691d75 | 300 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 301 | { |
23691d75 GP |
302 | write_lock_bh(&chan_list_lock); |
303 | list_del(&chan->global_l); | |
304 | write_unlock_bh(&chan_list_lock); | |
305 | ||
71ba0e56 | 306 | chan_put(chan); |
6ff5abbf GP |
307 | } |
308 | ||
48454079 | 309 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 310 | { |
af05b30b | 311 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 312 | chan->psm, chan->dcid); |
0139418c | 313 | |
2950f21a MH |
314 | conn->disc_reason = 0x13; |
315 | ||
8c1d787b | 316 | chan->conn = conn; |
0139418c | 317 | |
715ec005 | 318 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
319 | if (conn->hcon->type == LE_LINK) { |
320 | /* LE connection */ | |
0c1bc5c6 | 321 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
322 | chan->scid = L2CAP_CID_LE_DATA; |
323 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
324 | } else { |
325 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 326 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 327 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 328 | } |
715ec005 | 329 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 330 | /* Connectionless socket */ |
fe4128e0 GP |
331 | chan->scid = L2CAP_CID_CONN_LESS; |
332 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 333 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
334 | } else { |
335 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
336 | chan->scid = L2CAP_CID_SIGNALING; |
337 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 338 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
339 | } |
340 | ||
71ba0e56 | 341 | chan_hold(chan); |
baa7e1fa GP |
342 | |
343 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
344 | } |
345 | ||
8e87d142 | 346 | /* Delete channel. |
0139418c | 347 | * Must be called on the locked socket. */ |
4519de9a | 348 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 349 | { |
48454079 | 350 | struct sock *sk = chan->sk; |
8c1d787b | 351 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
352 | struct sock *parent = bt_sk(sk)->parent; |
353 | ||
c9b66675 | 354 | __clear_chan_timer(chan); |
0139418c | 355 | |
49208c9c | 356 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 357 | |
8e87d142 | 358 | if (conn) { |
baa7e1fa GP |
359 | /* Delete from channel list */ |
360 | write_lock_bh(&conn->chan_lock); | |
361 | list_del(&chan->list); | |
362 | write_unlock_bh(&conn->chan_lock); | |
71ba0e56 | 363 | chan_put(chan); |
baa7e1fa | 364 | |
8c1d787b | 365 | chan->conn = NULL; |
0139418c MH |
366 | hci_conn_put(conn->hcon); |
367 | } | |
368 | ||
89bc500e | 369 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
370 | sock_set_flag(sk, SOCK_ZAPPED); |
371 | ||
372 | if (err) | |
373 | sk->sk_err = err; | |
374 | ||
375 | if (parent) { | |
376 | bt_accept_unlink(sk); | |
377 | parent->sk_data_ready(parent, 0); | |
378 | } else | |
379 | sk->sk_state_change(sk); | |
c13ffa62 | 380 | |
c1360a1c GP |
381 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
382 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 383 | return; |
2ead70b8 | 384 | |
58d35f87 | 385 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 386 | |
0c1bc5c6 | 387 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
388 | struct srej_list *l, *tmp; |
389 | ||
1a09bcb9 GP |
390 | __clear_retrans_timer(chan); |
391 | __clear_monitor_timer(chan); | |
392 | __clear_ack_timer(chan); | |
c13ffa62 | 393 | |
f1c6775b | 394 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 395 | |
39d5a3ee | 396 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
397 | list_del(&l->list); |
398 | kfree(l); | |
399 | } | |
400 | } | |
0139418c MH |
401 | } |
402 | ||
4519de9a GP |
403 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
404 | { | |
405 | struct sock *sk; | |
406 | ||
407 | BT_DBG("parent %p", parent); | |
408 | ||
409 | /* Close not yet accepted channels */ | |
0f852724 | 410 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 411 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 412 | __clear_chan_timer(chan); |
0f852724 | 413 | lock_sock(sk); |
ba3bd0ee | 414 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 415 | release_sock(sk); |
ba3bd0ee | 416 | chan->ops->close(chan->data); |
0f852724 | 417 | } |
4519de9a GP |
418 | } |
419 | ||
0f852724 | 420 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
421 | { |
422 | struct l2cap_conn *conn = chan->conn; | |
423 | struct sock *sk = chan->sk; | |
424 | ||
89bc500e | 425 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 426 | |
89bc500e | 427 | switch (chan->state) { |
4519de9a GP |
428 | case BT_LISTEN: |
429 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
430 | |
431 | l2cap_state_change(chan, BT_CLOSED); | |
432 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
433 | break; |
434 | ||
435 | case BT_CONNECTED: | |
436 | case BT_CONFIG: | |
715ec005 | 437 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 438 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
439 | __clear_chan_timer(chan); |
440 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
441 | l2cap_send_disconn_req(conn, chan, reason); |
442 | } else | |
443 | l2cap_chan_del(chan, reason); | |
444 | break; | |
445 | ||
446 | case BT_CONNECT2: | |
715ec005 | 447 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
448 | conn->hcon->type == ACL_LINK) { |
449 | struct l2cap_conn_rsp rsp; | |
450 | __u16 result; | |
451 | ||
452 | if (bt_sk(sk)->defer_setup) | |
453 | result = L2CAP_CR_SEC_BLOCK; | |
454 | else | |
455 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 456 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
457 | |
458 | rsp.scid = cpu_to_le16(chan->dcid); | |
459 | rsp.dcid = cpu_to_le16(chan->scid); | |
460 | rsp.result = cpu_to_le16(result); | |
461 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
462 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
463 | sizeof(rsp), &rsp); | |
464 | } | |
465 | ||
466 | l2cap_chan_del(chan, reason); | |
467 | break; | |
468 | ||
469 | case BT_CONNECT: | |
470 | case BT_DISCONN: | |
471 | l2cap_chan_del(chan, reason); | |
472 | break; | |
473 | ||
474 | default: | |
475 | sock_set_flag(sk, SOCK_ZAPPED); | |
476 | break; | |
477 | } | |
478 | } | |
479 | ||
4343478f | 480 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 481 | { |
715ec005 | 482 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 483 | switch (chan->sec_level) { |
8556edd3 JH |
484 | case BT_SECURITY_HIGH: |
485 | return HCI_AT_DEDICATED_BONDING_MITM; | |
486 | case BT_SECURITY_MEDIUM: | |
487 | return HCI_AT_DEDICATED_BONDING; | |
488 | default: | |
489 | return HCI_AT_NO_BONDING; | |
490 | } | |
fe4128e0 | 491 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
492 | if (chan->sec_level == BT_SECURITY_LOW) |
493 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 494 | |
4343478f | 495 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 496 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 497 | else |
8556edd3 | 498 | return HCI_AT_NO_BONDING; |
00ae4af9 | 499 | } else { |
4343478f | 500 | switch (chan->sec_level) { |
00ae4af9 | 501 | case BT_SECURITY_HIGH: |
8556edd3 | 502 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 503 | case BT_SECURITY_MEDIUM: |
8556edd3 | 504 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 505 | default: |
8556edd3 | 506 | return HCI_AT_NO_BONDING; |
00ae4af9 | 507 | } |
0684e5f9 | 508 | } |
8556edd3 JH |
509 | } |
510 | ||
511 | /* Service level security */ | |
4343478f | 512 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 513 | { |
8c1d787b | 514 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
515 | __u8 auth_type; |
516 | ||
4343478f | 517 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 518 | |
4343478f | 519 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
520 | } |
521 | ||
b5ad8b7f | 522 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
523 | { |
524 | u8 id; | |
525 | ||
526 | /* Get next available identificator. | |
527 | * 1 - 128 are used by kernel. | |
528 | * 129 - 199 are reserved. | |
529 | * 200 - 254 are used by utilities like l2ping, etc. | |
530 | */ | |
531 | ||
532 | spin_lock_bh(&conn->lock); | |
533 | ||
534 | if (++conn->tx_ident > 128) | |
535 | conn->tx_ident = 1; | |
536 | ||
537 | id = conn->tx_ident; | |
538 | ||
539 | spin_unlock_bh(&conn->lock); | |
540 | ||
541 | return id; | |
542 | } | |
543 | ||
4519de9a | 544 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
545 | { |
546 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 547 | u8 flags; |
4e8402a3 MH |
548 | |
549 | BT_DBG("code 0x%2.2x", code); | |
550 | ||
551 | if (!skb) | |
9a9c6a34 | 552 | return; |
4e8402a3 | 553 | |
e702112f AE |
554 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
555 | flags = ACL_START_NO_FLUSH; | |
556 | else | |
557 | flags = ACL_START; | |
558 | ||
14b12d0b JG |
559 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
560 | ||
e702112f | 561 | hci_send_acl(conn->hcon, skb, flags); |
4e8402a3 MH |
562 | } |
563 | ||
525cd185 | 564 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
565 | { |
566 | struct sk_buff *skb; | |
567 | struct l2cap_hdr *lh; | |
8c1d787b | 568 | struct l2cap_conn *conn = chan->conn; |
fcc203c3 | 569 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 570 | u8 flags; |
fcc203c3 | 571 | |
89bc500e | 572 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
573 | return; |
574 | ||
47d1ec61 | 575 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 | 576 | hlen += 2; |
1c2acffb | 577 | |
49208c9c | 578 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 579 | |
fcc203c3 | 580 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
581 | control |= L2CAP_CTRL_FRAME_TYPE; |
582 | ||
e2ab4353 | 583 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
9e917af1 | 584 | control |= L2CAP_CTRL_FINAL; |
9e917af1 | 585 | |
e2ab4353 | 586 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
f0946ccf | 587 | control |= L2CAP_CTRL_POLL; |
f0946ccf | 588 | |
1c2acffb GP |
589 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
590 | if (!skb) | |
9a9c6a34 | 591 | return; |
1c2acffb GP |
592 | |
593 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 594 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 595 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
596 | put_unaligned_le16(control, skb_put(skb, 2)); |
597 | ||
47d1ec61 | 598 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
599 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
600 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
601 | } | |
602 | ||
e702112f AE |
603 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
604 | flags = ACL_START_NO_FLUSH; | |
605 | else | |
606 | flags = ACL_START; | |
607 | ||
15770b1a | 608 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
14b12d0b | 609 | |
8c1d787b | 610 | hci_send_acl(chan->conn->hcon, skb, flags); |
1c2acffb GP |
611 | } |
612 | ||
525cd185 | 613 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 614 | { |
e2ab4353 | 615 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 616 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 617 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 618 | } else |
ab784b73 | 619 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 620 | |
0b209fae | 621 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 622 | |
525cd185 | 623 | l2cap_send_sframe(chan, control); |
7e743090 GP |
624 | } |
625 | ||
b4450035 | 626 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 627 | { |
c1360a1c | 628 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
629 | } |
630 | ||
fc7f8a7e | 631 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 632 | { |
8c1d787b | 633 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
634 | |
635 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
636 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
637 | return; | |
638 | ||
4343478f GP |
639 | if (l2cap_check_security(chan) && |
640 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 | 641 | struct l2cap_conn_req req; |
fe4128e0 GP |
642 | req.scid = cpu_to_le16(chan->scid); |
643 | req.psm = chan->psm; | |
79d554a6 | 644 | |
fc7f8a7e | 645 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 646 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 647 | |
fc7f8a7e GP |
648 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
649 | sizeof(req), &req); | |
b1235d79 | 650 | } |
79d554a6 MH |
651 | } else { |
652 | struct l2cap_info_req req; | |
653 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
654 | ||
655 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
656 | conn->info_ident = l2cap_get_ident(conn); | |
657 | ||
658 | mod_timer(&conn->info_timer, jiffies + | |
659 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
660 | ||
661 | l2cap_send_cmd(conn, conn->info_ident, | |
662 | L2CAP_INFO_REQ, sizeof(req), &req); | |
663 | } | |
664 | } | |
665 | ||
cf6c2c0b GP |
666 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
667 | { | |
668 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 669 | if (!disable_ertm) |
cf6c2c0b GP |
670 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
671 | ||
672 | switch (mode) { | |
673 | case L2CAP_MODE_ERTM: | |
674 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
675 | case L2CAP_MODE_STREAMING: | |
676 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
677 | default: | |
678 | return 0x00; | |
679 | } | |
680 | } | |
681 | ||
4519de9a | 682 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 683 | { |
e92c8e70 | 684 | struct sock *sk; |
22121fc9 GP |
685 | struct l2cap_disconn_req req; |
686 | ||
c13ffa62 GP |
687 | if (!conn) |
688 | return; | |
689 | ||
e92c8e70 GP |
690 | sk = chan->sk; |
691 | ||
0c1bc5c6 | 692 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
693 | __clear_retrans_timer(chan); |
694 | __clear_monitor_timer(chan); | |
695 | __clear_ack_timer(chan); | |
c13ffa62 GP |
696 | } |
697 | ||
fe4128e0 GP |
698 | req.dcid = cpu_to_le16(chan->dcid); |
699 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
700 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
701 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 702 | |
89bc500e | 703 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 704 | sk->sk_err = err; |
22121fc9 GP |
705 | } |
706 | ||
1da177e4 | 707 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
708 | static void l2cap_conn_start(struct l2cap_conn *conn) |
709 | { | |
820ffdb3 | 710 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
711 | |
712 | BT_DBG("conn %p", conn); | |
713 | ||
baa7e1fa | 714 | read_lock(&conn->chan_lock); |
4e8402a3 | 715 | |
820ffdb3 | 716 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 717 | struct sock *sk = chan->sk; |
baa7e1fa | 718 | |
4e8402a3 MH |
719 | bh_lock_sock(sk); |
720 | ||
715ec005 | 721 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
722 | bh_unlock_sock(sk); |
723 | continue; | |
724 | } | |
725 | ||
89bc500e | 726 | if (chan->state == BT_CONNECT) { |
47731de7 | 727 | struct l2cap_conn_req req; |
79d554a6 | 728 | |
4343478f | 729 | if (!l2cap_check_security(chan) || |
b4450035 | 730 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
731 | bh_unlock_sock(sk); |
732 | continue; | |
733 | } | |
79d554a6 | 734 | |
c1360a1c GP |
735 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
736 | && test_bit(CONF_STATE2_DEVICE, | |
737 | &chan->conf_state)) { | |
0f852724 | 738 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 739 | * so release the lock */ |
2461daac | 740 | read_unlock(&conn->chan_lock); |
89bc500e | 741 | l2cap_chan_close(chan, ECONNRESET); |
2461daac | 742 | read_lock(&conn->chan_lock); |
47731de7 GP |
743 | bh_unlock_sock(sk); |
744 | continue; | |
b1235d79 | 745 | } |
47731de7 | 746 | |
fe4128e0 GP |
747 | req.scid = cpu_to_le16(chan->scid); |
748 | req.psm = chan->psm; | |
47731de7 | 749 | |
fc7f8a7e | 750 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 751 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 752 | |
fc7f8a7e GP |
753 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
754 | sizeof(req), &req); | |
47731de7 | 755 | |
89bc500e | 756 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 757 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 758 | char buf[128]; |
fe4128e0 GP |
759 | rsp.scid = cpu_to_le16(chan->dcid); |
760 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 761 | |
4343478f | 762 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
763 | if (bt_sk(sk)->defer_setup) { |
764 | struct sock *parent = bt_sk(sk)->parent; | |
765 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
766 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
767 | if (parent) |
768 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
769 | |
770 | } else { | |
89bc500e | 771 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
772 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
773 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
774 | } | |
79d554a6 MH |
775 | } else { |
776 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
777 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
778 | } | |
779 | ||
fc7f8a7e GP |
780 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
781 | sizeof(rsp), &rsp); | |
e9aeb2dd | 782 | |
c1360a1c | 783 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
784 | rsp.result != L2CAP_CR_SUCCESS) { |
785 | bh_unlock_sock(sk); | |
786 | continue; | |
787 | } | |
788 | ||
c1360a1c | 789 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 790 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
791 | l2cap_build_conf_req(chan, buf), buf); |
792 | chan->num_conf_req++; | |
4e8402a3 MH |
793 | } |
794 | ||
795 | bh_unlock_sock(sk); | |
796 | } | |
797 | ||
baa7e1fa | 798 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
799 | } |
800 | ||
b62f328b VT |
801 | /* Find socket with cid and source bdaddr. |
802 | * Returns closest match, locked. | |
803 | */ | |
23691d75 | 804 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 805 | { |
23691d75 | 806 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 807 | |
23691d75 | 808 | read_lock(&chan_list_lock); |
b62f328b | 809 | |
23691d75 GP |
810 | list_for_each_entry(c, &chan_list, global_l) { |
811 | struct sock *sk = c->sk; | |
fe4128e0 | 812 | |
89bc500e | 813 | if (state && c->state != state) |
b62f328b VT |
814 | continue; |
815 | ||
23691d75 | 816 | if (c->scid == cid) { |
b62f328b | 817 | /* Exact match. */ |
23691d75 GP |
818 | if (!bacmp(&bt_sk(sk)->src, src)) { |
819 | read_unlock(&chan_list_lock); | |
820 | return c; | |
821 | } | |
b62f328b VT |
822 | |
823 | /* Closest match */ | |
824 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 825 | c1 = c; |
b62f328b VT |
826 | } |
827 | } | |
280f294f | 828 | |
23691d75 | 829 | read_unlock(&chan_list_lock); |
b62f328b | 830 | |
23691d75 | 831 | return c1; |
b62f328b VT |
832 | } |
833 | ||
834 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
835 | { | |
c916fbe4 | 836 | struct sock *parent, *sk; |
23691d75 | 837 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
838 | |
839 | BT_DBG(""); | |
840 | ||
841 | /* Check if we have socket listening on cid */ | |
23691d75 | 842 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 843 | conn->src); |
23691d75 | 844 | if (!pchan) |
b62f328b VT |
845 | return; |
846 | ||
23691d75 GP |
847 | parent = pchan->sk; |
848 | ||
62f3a2cf GP |
849 | bh_lock_sock(parent); |
850 | ||
b62f328b VT |
851 | /* Check for backlog size */ |
852 | if (sk_acceptq_is_full(parent)) { | |
853 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
854 | goto clean; | |
855 | } | |
856 | ||
80808e43 GP |
857 | chan = pchan->ops->new_connection(pchan->data); |
858 | if (!chan) | |
b62f328b VT |
859 | goto clean; |
860 | ||
80808e43 | 861 | sk = chan->sk; |
5d41ce1d | 862 | |
baa7e1fa | 863 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
864 | |
865 | hci_conn_hold(conn->hcon); | |
866 | ||
b62f328b VT |
867 | bacpy(&bt_sk(sk)->src, conn->src); |
868 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
869 | ||
d1010240 GP |
870 | bt_accept_enqueue(parent, sk); |
871 | ||
48454079 GP |
872 | __l2cap_chan_add(conn, chan); |
873 | ||
c9b66675 | 874 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 875 | |
89bc500e | 876 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
877 | parent->sk_data_ready(parent, 0); |
878 | ||
baa7e1fa | 879 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
880 | |
881 | clean: | |
882 | bh_unlock_sock(parent); | |
883 | } | |
884 | ||
f1cb9af5 VCG |
885 | static void l2cap_chan_ready(struct sock *sk) |
886 | { | |
887 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
888 | struct sock *parent = bt_sk(sk)->parent; | |
889 | ||
890 | BT_DBG("sk %p, parent %p", sk, parent); | |
891 | ||
892 | chan->conf_state = 0; | |
893 | __clear_chan_timer(chan); | |
894 | ||
43f3dc41 | 895 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
896 | sk->sk_state_change(sk); |
897 | ||
898 | if (parent) | |
899 | parent->sk_data_ready(parent, 0); | |
900 | } | |
901 | ||
4e8402a3 MH |
902 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
903 | { | |
48454079 | 904 | struct l2cap_chan *chan; |
4e8402a3 | 905 | |
79d554a6 | 906 | BT_DBG("conn %p", conn); |
4e8402a3 | 907 | |
b62f328b VT |
908 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
909 | l2cap_le_conn_ready(conn); | |
910 | ||
160dc6ac VCG |
911 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
912 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
913 | ||
baa7e1fa | 914 | read_lock(&conn->chan_lock); |
4e8402a3 | 915 | |
baa7e1fa | 916 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 917 | struct sock *sk = chan->sk; |
baa7e1fa | 918 | |
79d554a6 | 919 | bh_lock_sock(sk); |
4e8402a3 | 920 | |
63128451 | 921 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 922 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 923 | l2cap_chan_ready(sk); |
acd7d370 | 924 | |
63128451 | 925 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 926 | __clear_chan_timer(chan); |
89bc500e | 927 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 928 | sk->sk_state_change(sk); |
b501d6a1 | 929 | |
89bc500e | 930 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 931 | l2cap_do_start(chan); |
4e8402a3 | 932 | |
79d554a6 | 933 | bh_unlock_sock(sk); |
4e8402a3 | 934 | } |
79d554a6 | 935 | |
baa7e1fa | 936 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
937 | } |
938 | ||
939 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
940 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
941 | { | |
48454079 | 942 | struct l2cap_chan *chan; |
4e8402a3 MH |
943 | |
944 | BT_DBG("conn %p", conn); | |
945 | ||
baa7e1fa | 946 | read_lock(&conn->chan_lock); |
4e8402a3 | 947 | |
baa7e1fa | 948 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 949 | struct sock *sk = chan->sk; |
baa7e1fa | 950 | |
ecf61bdb | 951 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
4e8402a3 MH |
952 | sk->sk_err = err; |
953 | } | |
954 | ||
baa7e1fa | 955 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
956 | } |
957 | ||
958 | static void l2cap_info_timeout(unsigned long arg) | |
959 | { | |
960 | struct l2cap_conn *conn = (void *) arg; | |
961 | ||
984947dc | 962 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 963 | conn->info_ident = 0; |
984947dc | 964 | |
4e8402a3 MH |
965 | l2cap_conn_start(conn); |
966 | } | |
967 | ||
5d3de7df VCG |
968 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
969 | { | |
970 | struct l2cap_conn *conn = hcon->l2cap_data; | |
971 | struct l2cap_chan *chan, *l; | |
972 | struct sock *sk; | |
973 | ||
974 | if (!conn) | |
975 | return; | |
976 | ||
977 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
978 | ||
979 | kfree_skb(conn->rx_skb); | |
980 | ||
981 | /* Kill channels */ | |
982 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
983 | sk = chan->sk; | |
984 | bh_lock_sock(sk); | |
985 | l2cap_chan_del(chan, err); | |
986 | bh_unlock_sock(sk); | |
987 | chan->ops->close(chan->data); | |
988 | } | |
989 | ||
990 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) | |
991 | del_timer_sync(&conn->info_timer); | |
992 | ||
d26a2345 | 993 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
5d3de7df | 994 | del_timer(&conn->security_timer); |
8aab4757 | 995 | smp_chan_destroy(conn); |
d26a2345 | 996 | } |
5d3de7df VCG |
997 | |
998 | hcon->l2cap_data = NULL; | |
999 | kfree(conn); | |
1000 | } | |
1001 | ||
1002 | static void security_timeout(unsigned long arg) | |
1003 | { | |
1004 | struct l2cap_conn *conn = (void *) arg; | |
1005 | ||
1006 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1007 | } | |
1008 | ||
1da177e4 LT |
1009 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1010 | { | |
0139418c | 1011 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 1012 | |
0139418c | 1013 | if (conn || status) |
1da177e4 LT |
1014 | return conn; |
1015 | ||
0139418c MH |
1016 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
1017 | if (!conn) | |
1da177e4 | 1018 | return NULL; |
1da177e4 LT |
1019 | |
1020 | hcon->l2cap_data = conn; | |
1021 | conn->hcon = hcon; | |
1022 | ||
0139418c MH |
1023 | BT_DBG("hcon %p conn %p", hcon, conn); |
1024 | ||
acd7d370 VT |
1025 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1026 | conn->mtu = hcon->hdev->le_mtu; | |
1027 | else | |
1028 | conn->mtu = hcon->hdev->acl_mtu; | |
1029 | ||
1da177e4 LT |
1030 | conn->src = &hcon->hdev->bdaddr; |
1031 | conn->dst = &hcon->dst; | |
1032 | ||
4e8402a3 MH |
1033 | conn->feat_mask = 0; |
1034 | ||
1da177e4 | 1035 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1036 | rwlock_init(&conn->chan_lock); |
1037 | ||
1038 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1039 | |
5d3de7df VCG |
1040 | if (hcon->type == LE_LINK) |
1041 | setup_timer(&conn->security_timer, security_timeout, | |
1042 | (unsigned long) conn); | |
1043 | else | |
b62f328b | 1044 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
45054dc1 DY |
1045 | (unsigned long) conn); |
1046 | ||
2950f21a MH |
1047 | conn->disc_reason = 0x13; |
1048 | ||
1da177e4 LT |
1049 | return conn; |
1050 | } | |
1051 | ||
48454079 | 1052 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1053 | { |
baa7e1fa | 1054 | write_lock_bh(&conn->chan_lock); |
48454079 | 1055 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1056 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1057 | } |
1058 | ||
1da177e4 | 1059 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1060 | |
1061 | /* Find socket with psm and source bdaddr. | |
1062 | * Returns closest match. | |
1063 | */ | |
23691d75 | 1064 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1065 | { |
23691d75 | 1066 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1067 | |
23691d75 | 1068 | read_lock(&chan_list_lock); |
e0f0cb56 | 1069 | |
23691d75 GP |
1070 | list_for_each_entry(c, &chan_list, global_l) { |
1071 | struct sock *sk = c->sk; | |
fe4128e0 | 1072 | |
89bc500e | 1073 | if (state && c->state != state) |
1da177e4 LT |
1074 | continue; |
1075 | ||
23691d75 | 1076 | if (c->psm == psm) { |
1da177e4 | 1077 | /* Exact match. */ |
23691d75 | 1078 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1079 | read_unlock(&chan_list_lock); |
23691d75 GP |
1080 | return c; |
1081 | } | |
1da177e4 LT |
1082 | |
1083 | /* Closest match */ | |
1084 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1085 | c1 = c; |
1da177e4 LT |
1086 | } |
1087 | } | |
1da177e4 | 1088 | |
23691d75 | 1089 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1090 | |
23691d75 | 1091 | return c1; |
1da177e4 LT |
1092 | } |
1093 | ||
77a74c7e | 1094 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1095 | { |
5d41ce1d | 1096 | struct sock *sk = chan->sk; |
1da177e4 LT |
1097 | bdaddr_t *src = &bt_sk(sk)->src; |
1098 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1099 | struct l2cap_conn *conn; | |
1100 | struct hci_conn *hcon; | |
1101 | struct hci_dev *hdev; | |
09ab6f4c | 1102 | __u8 auth_type; |
44d0e48e | 1103 | int err; |
1da177e4 | 1104 | |
f29972de | 1105 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1106 | chan->psm); |
1da177e4 | 1107 | |
af05b30b GP |
1108 | hdev = hci_get_route(dst, src); |
1109 | if (!hdev) | |
1da177e4 LT |
1110 | return -EHOSTUNREACH; |
1111 | ||
1112 | hci_dev_lock_bh(hdev); | |
1113 | ||
4343478f | 1114 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1115 | |
fe4128e0 | 1116 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1117 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1118 | chan->sec_level, auth_type); |
acd7d370 VT |
1119 | else |
1120 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1121 | chan->sec_level, auth_type); |
acd7d370 | 1122 | |
30e76272 VT |
1123 | if (IS_ERR(hcon)) { |
1124 | err = PTR_ERR(hcon); | |
1da177e4 | 1125 | goto done; |
30e76272 | 1126 | } |
1da177e4 LT |
1127 | |
1128 | conn = l2cap_conn_add(hcon, 0); | |
1129 | if (!conn) { | |
1130 | hci_conn_put(hcon); | |
30e76272 | 1131 | err = -ENOMEM; |
1da177e4 LT |
1132 | goto done; |
1133 | } | |
1134 | ||
1da177e4 LT |
1135 | /* Update source addr of the socket */ |
1136 | bacpy(src, conn->src); | |
1137 | ||
48454079 GP |
1138 | l2cap_chan_add(conn, chan); |
1139 | ||
89bc500e | 1140 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1141 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1142 | |
1143 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1144 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1145 | __clear_chan_timer(chan); |
4343478f | 1146 | if (l2cap_check_security(chan)) |
89bc500e | 1147 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1148 | } else |
fc7f8a7e | 1149 | l2cap_do_start(chan); |
1da177e4 LT |
1150 | } |
1151 | ||
30e76272 VT |
1152 | err = 0; |
1153 | ||
1da177e4 LT |
1154 | done: |
1155 | hci_dev_unlock_bh(hdev); | |
1156 | hci_dev_put(hdev); | |
1157 | return err; | |
1158 | } | |
1159 | ||
dcba0dba | 1160 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1161 | { |
8c1d787b | 1162 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1163 | DECLARE_WAITQUEUE(wait, current); |
1164 | int err = 0; | |
1165 | int timeo = HZ/5; | |
1166 | ||
2b0b05dd | 1167 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1168 | set_current_state(TASK_INTERRUPTIBLE); |
1169 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1170 | if (!timeo) |
1171 | timeo = HZ/5; | |
1172 | ||
1173 | if (signal_pending(current)) { | |
1174 | err = sock_intr_errno(timeo); | |
1175 | break; | |
1176 | } | |
1177 | ||
1178 | release_sock(sk); | |
1179 | timeo = schedule_timeout(timeo); | |
1180 | lock_sock(sk); | |
a71a0cf4 | 1181 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1182 | |
1183 | err = sock_error(sk); | |
1184 | if (err) | |
1185 | break; | |
1186 | } | |
1187 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1188 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1189 | return err; |
1190 | } | |
1191 | ||
e90bac06 GP |
1192 | static void l2cap_monitor_timeout(unsigned long arg) |
1193 | { | |
525cd185 GP |
1194 | struct l2cap_chan *chan = (void *) arg; |
1195 | struct sock *sk = chan->sk; | |
e90bac06 | 1196 | |
525cd185 | 1197 | BT_DBG("chan %p", chan); |
0e98958d | 1198 | |
e686219a | 1199 | bh_lock_sock(sk); |
2c03a7a4 | 1200 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1201 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1202 | bh_unlock_sock(sk); |
e90bac06 GP |
1203 | return; |
1204 | } | |
1205 | ||
6a026610 | 1206 | chan->retry_count++; |
1a09bcb9 | 1207 | __set_monitor_timer(chan); |
e90bac06 | 1208 | |
525cd185 | 1209 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1210 | bh_unlock_sock(sk); |
e90bac06 GP |
1211 | } |
1212 | ||
1213 | static void l2cap_retrans_timeout(unsigned long arg) | |
1214 | { | |
525cd185 GP |
1215 | struct l2cap_chan *chan = (void *) arg; |
1216 | struct sock *sk = chan->sk; | |
e90bac06 | 1217 | |
49208c9c | 1218 | BT_DBG("chan %p", chan); |
0e98958d | 1219 | |
e686219a | 1220 | bh_lock_sock(sk); |
6a026610 | 1221 | chan->retry_count = 1; |
1a09bcb9 | 1222 | __set_monitor_timer(chan); |
e90bac06 | 1223 | |
e2ab4353 | 1224 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1225 | |
525cd185 | 1226 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1227 | bh_unlock_sock(sk); |
e90bac06 GP |
1228 | } |
1229 | ||
42e5c802 | 1230 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1231 | { |
1c2acffb | 1232 | struct sk_buff *skb; |
1da177e4 | 1233 | |
58d35f87 | 1234 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1235 | chan->unacked_frames) { |
42e5c802 | 1236 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1237 | break; |
1da177e4 | 1238 | |
58d35f87 | 1239 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1240 | kfree_skb(skb); |
1da177e4 | 1241 | |
6a026610 | 1242 | chan->unacked_frames--; |
1c2acffb | 1243 | } |
1da177e4 | 1244 | |
6a026610 | 1245 | if (!chan->unacked_frames) |
1a09bcb9 | 1246 | __clear_retrans_timer(chan); |
1c2acffb | 1247 | } |
1da177e4 | 1248 | |
67c9e840 | 1249 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1250 | { |
8c1d787b | 1251 | struct hci_conn *hcon = chan->conn->hcon; |
e702112f | 1252 | u16 flags; |
1c2acffb | 1253 | |
4343478f | 1254 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1255 | |
d57b0e8b AE |
1256 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
1257 | lmp_no_flush_capable(hcon->hdev)) | |
e702112f AE |
1258 | flags = ACL_START_NO_FLUSH; |
1259 | else | |
1260 | flags = ACL_START; | |
1261 | ||
15770b1a | 1262 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
e702112f | 1263 | hci_send_acl(hcon, skb, flags); |
1c2acffb GP |
1264 | } |
1265 | ||
67c9e840 | 1266 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1267 | { |
ccbb84af | 1268 | struct sk_buff *skb; |
fcc203c3 | 1269 | u16 control, fcs; |
6840ed07 | 1270 | |
58d35f87 | 1271 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1272 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1273 | control |= __set_txseq(chan, chan->next_tx_seq); |
ccbb84af | 1274 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1275 | |
47d1ec61 | 1276 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1277 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1278 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1279 | } |
1280 | ||
4343478f | 1281 | l2cap_do_send(chan, skb); |
6840ed07 | 1282 | |
42e5c802 | 1283 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1284 | } |
6840ed07 GP |
1285 | } |
1286 | ||
fb45de7d | 1287 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1288 | { |
8f17154f GP |
1289 | struct sk_buff *skb, *tx_skb; |
1290 | u16 control, fcs; | |
8f17154f | 1291 | |
58d35f87 | 1292 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1293 | if (!skb) |
1294 | return; | |
8f17154f | 1295 | |
f11d676d GP |
1296 | do { |
1297 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1298 | break; |
8f17154f | 1299 | |
58d35f87 | 1300 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1301 | return; |
8f17154f | 1302 | |
58d35f87 | 1303 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1304 | |
2c03a7a4 GP |
1305 | if (chan->remote_max_tx && |
1306 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1307 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1308 | return; |
1309 | } | |
1310 | ||
1311 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1312 | bt_cb(skb)->retries++; | |
1313 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1314 | control &= __get_sar_mask(chan); |
3cb123d1 | 1315 | |
e2ab4353 | 1316 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
3cb123d1 | 1317 | control |= L2CAP_CTRL_FINAL; |
95ffa978 | 1318 | |
0b209fae | 1319 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1320 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1321 | |
f11d676d GP |
1322 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1323 | ||
47d1ec61 | 1324 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1325 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1326 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1327 | } | |
1328 | ||
4343478f | 1329 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1330 | } |
1331 | ||
67c9e840 | 1332 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1333 | { |
1334 | struct sk_buff *skb, *tx_skb; | |
fcc203c3 | 1335 | u16 control, fcs; |
9a9c6a34 | 1336 | int nsent = 0; |
1c2acffb | 1337 | |
89bc500e | 1338 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1339 | return -ENOTCONN; |
e90bac06 | 1340 | |
58d35f87 | 1341 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1342 | |
2c03a7a4 GP |
1343 | if (chan->remote_max_tx && |
1344 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1345 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1346 | break; |
1347 | } | |
1348 | ||
e420aba3 AE |
1349 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1350 | ||
e90bac06 GP |
1351 | bt_cb(skb)->retries++; |
1352 | ||
1c2acffb | 1353 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1354 | control &= __get_sar_mask(chan); |
95ffa978 | 1355 | |
e2ab4353 | 1356 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
d5392c8f | 1357 | control |= L2CAP_CTRL_FINAL; |
e2ab4353 | 1358 | |
0b209fae | 1359 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1360 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb GP |
1361 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1362 | ||
e90bac06 | 1363 | |
47d1ec61 | 1364 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1365 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1366 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1367 | } | |
1368 | ||
4343478f | 1369 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1370 | |
1a09bcb9 | 1371 | __set_retrans_timer(chan); |
1c2acffb | 1372 | |
42e5c802 GP |
1373 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1374 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1375 | |
23e9fde2 | 1376 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1377 | chan->unacked_frames++; |
23e9fde2 | 1378 | |
6a026610 | 1379 | chan->frames_sent++; |
1c2acffb | 1380 | |
58d35f87 GP |
1381 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1382 | chan->tx_send_head = NULL; | |
1c2acffb | 1383 | else |
58d35f87 | 1384 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1385 | |
1386 | nsent++; | |
1c2acffb GP |
1387 | } |
1388 | ||
9e917af1 GP |
1389 | return nsent; |
1390 | } | |
1391 | ||
525cd185 | 1392 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1393 | { |
dfc909be GP |
1394 | int ret; |
1395 | ||
58d35f87 GP |
1396 | if (!skb_queue_empty(&chan->tx_q)) |
1397 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1398 | |
42e5c802 | 1399 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1400 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1401 | return ret; |
1402 | } | |
1403 | ||
525cd185 | 1404 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1405 | { |
9e917af1 GP |
1406 | u16 control = 0; |
1407 | ||
0b209fae | 1408 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1409 | |
e2ab4353 | 1410 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1411 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1412 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1413 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1414 | return; |
9e917af1 | 1415 | } |
dfc909be | 1416 | |
525cd185 | 1417 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1418 | return; |
1419 | ||
ab784b73 | 1420 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1421 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1422 | } |
1423 | ||
525cd185 | 1424 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1425 | { |
1426 | struct srej_list *tail; | |
1427 | u16 control; | |
1428 | ||
ab784b73 | 1429 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
99b0d4b7 GP |
1430 | control |= L2CAP_CTRL_FINAL; |
1431 | ||
39d5a3ee | 1432 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1433 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1434 | |
525cd185 | 1435 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1436 | } |
1437 | ||
1c2acffb GP |
1438 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1439 | { | |
8c1d787b | 1440 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1441 | struct sk_buff **frag; |
1442 | int err, sent = 0; | |
1da177e4 | 1443 | |
59203a21 | 1444 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1445 | return -EFAULT; |
1da177e4 LT |
1446 | |
1447 | sent += count; | |
1448 | len -= count; | |
1449 | ||
1450 | /* Continuation fragments (no L2CAP header) */ | |
1451 | frag = &skb_shinfo(skb)->frag_list; | |
1452 | while (len) { | |
1453 | count = min_t(unsigned int, conn->mtu, len); | |
1454 | ||
1455 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1456 | if (!*frag) | |
0175d629 | 1457 | return err; |
1c2acffb GP |
1458 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1459 | return -EFAULT; | |
1da177e4 LT |
1460 | |
1461 | sent += count; | |
1462 | len -= count; | |
1463 | ||
1464 | frag = &(*frag)->next; | |
1465 | } | |
1da177e4 LT |
1466 | |
1467 | return sent; | |
1c2acffb | 1468 | } |
1da177e4 | 1469 | |
67c9e840 | 1470 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1471 | { |
fe4128e0 | 1472 | struct sock *sk = chan->sk; |
8c1d787b | 1473 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1474 | struct sk_buff *skb; |
1475 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1476 | struct l2cap_hdr *lh; | |
1477 | ||
1478 | BT_DBG("sk %p len %d", sk, (int)len); | |
1479 | ||
1480 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1481 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1482 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1483 | if (!skb) | |
0175d629 | 1484 | return ERR_PTR(err); |
1c2acffb GP |
1485 | |
1486 | /* Create L2CAP header */ | |
1487 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1488 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1489 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1490 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1491 | |
1492 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1493 | if (unlikely(err < 0)) { | |
1494 | kfree_skb(skb); | |
1495 | return ERR_PTR(err); | |
1496 | } | |
1497 | return skb; | |
1498 | } | |
1499 | ||
67c9e840 | 1500 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1501 | { |
fe4128e0 | 1502 | struct sock *sk = chan->sk; |
8c1d787b | 1503 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1504 | struct sk_buff *skb; |
1505 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1506 | struct l2cap_hdr *lh; | |
1507 | ||
1508 | BT_DBG("sk %p len %d", sk, (int)len); | |
1509 | ||
1510 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1511 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1512 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1513 | if (!skb) | |
0175d629 | 1514 | return ERR_PTR(err); |
1c2acffb GP |
1515 | |
1516 | /* Create L2CAP header */ | |
1517 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1518 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1519 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1520 | ||
1521 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1522 | if (unlikely(err < 0)) { | |
1523 | kfree_skb(skb); | |
1524 | return ERR_PTR(err); | |
1525 | } | |
1526 | return skb; | |
1527 | } | |
1528 | ||
ab0ff76d LAD |
1529 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1530 | struct msghdr *msg, size_t len, | |
1531 | u16 control, u16 sdulen) | |
1c2acffb | 1532 | { |
47d1ec61 | 1533 | struct sock *sk = chan->sk; |
8c1d787b | 1534 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1535 | struct sk_buff *skb; |
1536 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1537 | struct l2cap_hdr *lh; | |
1538 | ||
1539 | BT_DBG("sk %p len %d", sk, (int)len); | |
1540 | ||
0ee0d208 GP |
1541 | if (!conn) |
1542 | return ERR_PTR(-ENOTCONN); | |
1543 | ||
c74e560c GP |
1544 | if (sdulen) |
1545 | hlen += 2; | |
1546 | ||
47d1ec61 | 1547 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1548 | hlen += 2; |
1549 | ||
1c2acffb GP |
1550 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1551 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1552 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1553 | if (!skb) | |
0175d629 | 1554 | return ERR_PTR(err); |
1c2acffb GP |
1555 | |
1556 | /* Create L2CAP header */ | |
1557 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1558 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1559 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1560 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1561 | if (sdulen) |
1562 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1563 | |
1564 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1565 | if (unlikely(err < 0)) { | |
1566 | kfree_skb(skb); | |
1567 | return ERR_PTR(err); | |
1568 | } | |
e90bac06 | 1569 | |
47d1ec61 | 1570 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1571 | put_unaligned_le16(0, skb_put(skb, 2)); |
1572 | ||
e90bac06 | 1573 | bt_cb(skb)->retries = 0; |
1c2acffb | 1574 | return skb; |
1da177e4 LT |
1575 | } |
1576 | ||
67c9e840 | 1577 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1578 | { |
c74e560c GP |
1579 | struct sk_buff *skb; |
1580 | struct sk_buff_head sar_queue; | |
1581 | u16 control; | |
1582 | size_t size = 0; | |
1583 | ||
ff12fd64 | 1584 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1585 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1586 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1587 | if (IS_ERR(skb)) |
1588 | return PTR_ERR(skb); | |
1589 | ||
1590 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1591 | len -= chan->remote_mps; |
1592 | size += chan->remote_mps; | |
c74e560c GP |
1593 | |
1594 | while (len > 0) { | |
1595 | size_t buflen; | |
1596 | ||
2c03a7a4 | 1597 | if (len > chan->remote_mps) { |
7e0ef6ee | 1598 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1599 | buflen = chan->remote_mps; |
c74e560c | 1600 | } else { |
7e0ef6ee | 1601 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1602 | buflen = len; |
1603 | } | |
1604 | ||
47d1ec61 | 1605 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1606 | if (IS_ERR(skb)) { |
1607 | skb_queue_purge(&sar_queue); | |
1608 | return PTR_ERR(skb); | |
1609 | } | |
1610 | ||
1611 | __skb_queue_tail(&sar_queue, skb); | |
1612 | len -= buflen; | |
1613 | size += buflen; | |
c74e560c | 1614 | } |
58d35f87 GP |
1615 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1616 | if (chan->tx_send_head == NULL) | |
1617 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1618 | |
1619 | return size; | |
1620 | } | |
1621 | ||
9a91a04a GP |
1622 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1623 | { | |
9a91a04a GP |
1624 | struct sk_buff *skb; |
1625 | u16 control; | |
1626 | int err; | |
1627 | ||
1628 | /* Connectionless channel */ | |
715ec005 | 1629 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
9a91a04a GP |
1630 | skb = l2cap_create_connless_pdu(chan, msg, len); |
1631 | if (IS_ERR(skb)) | |
1632 | return PTR_ERR(skb); | |
1633 | ||
1634 | l2cap_do_send(chan, skb); | |
1635 | return len; | |
1636 | } | |
1637 | ||
1638 | switch (chan->mode) { | |
1639 | case L2CAP_MODE_BASIC: | |
1640 | /* Check outgoing MTU */ | |
1641 | if (len > chan->omtu) | |
1642 | return -EMSGSIZE; | |
1643 | ||
1644 | /* Create a basic PDU */ | |
1645 | skb = l2cap_create_basic_pdu(chan, msg, len); | |
1646 | if (IS_ERR(skb)) | |
1647 | return PTR_ERR(skb); | |
1648 | ||
1649 | l2cap_do_send(chan, skb); | |
1650 | err = len; | |
1651 | break; | |
1652 | ||
1653 | case L2CAP_MODE_ERTM: | |
1654 | case L2CAP_MODE_STREAMING: | |
1655 | /* Entire SDU fits into one PDU */ | |
1656 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1657 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1658 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1659 | 0); | |
1660 | if (IS_ERR(skb)) | |
1661 | return PTR_ERR(skb); | |
1662 | ||
1663 | __skb_queue_tail(&chan->tx_q, skb); | |
1664 | ||
1665 | if (chan->tx_send_head == NULL) | |
1666 | chan->tx_send_head = skb; | |
1667 | ||
1668 | } else { | |
1669 | /* Segment SDU into multiples PDUs */ | |
1670 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1671 | if (err < 0) | |
1672 | return err; | |
1673 | } | |
1674 | ||
1675 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1676 | l2cap_streaming_send(chan); | |
1677 | err = len; | |
1678 | break; | |
1679 | } | |
1680 | ||
e2ab4353 GP |
1681 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1682 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1683 | err = len; |
1684 | break; | |
1685 | } | |
1686 | ||
1687 | err = l2cap_ertm_send(chan); | |
1688 | if (err >= 0) | |
1689 | err = len; | |
1690 | ||
1691 | break; | |
1692 | ||
1693 | default: | |
1694 | BT_DBG("bad state %1.1x", chan->mode); | |
1695 | err = -EBADFD; | |
1696 | } | |
1697 | ||
1698 | return err; | |
1699 | } | |
1700 | ||
1da177e4 LT |
1701 | /* Copy frame to all raw sockets on that connection */ |
1702 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1703 | { | |
1da177e4 | 1704 | struct sk_buff *nskb; |
48454079 | 1705 | struct l2cap_chan *chan; |
1da177e4 LT |
1706 | |
1707 | BT_DBG("conn %p", conn); | |
1708 | ||
baa7e1fa GP |
1709 | read_lock(&conn->chan_lock); |
1710 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1711 | struct sock *sk = chan->sk; |
715ec005 | 1712 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1713 | continue; |
1714 | ||
1715 | /* Don't send frame to the socket it came from */ | |
1716 | if (skb->sk == sk) | |
1717 | continue; | |
af05b30b GP |
1718 | nskb = skb_clone(skb, GFP_ATOMIC); |
1719 | if (!nskb) | |
1da177e4 LT |
1720 | continue; |
1721 | ||
23070494 | 1722 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1723 | kfree_skb(nskb); |
1724 | } | |
baa7e1fa | 1725 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1726 | } |
1727 | ||
1728 | /* ---- L2CAP signalling commands ---- */ | |
1729 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1730 | u8 code, u8 ident, u16 dlen, void *data) | |
1731 | { | |
1732 | struct sk_buff *skb, **frag; | |
1733 | struct l2cap_cmd_hdr *cmd; | |
1734 | struct l2cap_hdr *lh; | |
1735 | int len, count; | |
1736 | ||
af05b30b GP |
1737 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1738 | conn, code, ident, dlen); | |
1da177e4 LT |
1739 | |
1740 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1741 | count = min_t(unsigned int, conn->mtu, len); | |
1742 | ||
1743 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1744 | if (!skb) | |
1745 | return NULL; | |
1746 | ||
1747 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1748 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1749 | |
1750 | if (conn->hcon->type == LE_LINK) | |
1751 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1752 | else | |
1753 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1754 | |
1755 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1756 | cmd->code = code; | |
1757 | cmd->ident = ident; | |
aca3192c | 1758 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1759 | |
1760 | if (dlen) { | |
1761 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1762 | memcpy(skb_put(skb, count), data, count); | |
1763 | data += count; | |
1764 | } | |
1765 | ||
1766 | len -= skb->len; | |
1767 | ||
1768 | /* Continuation fragments (no L2CAP header) */ | |
1769 | frag = &skb_shinfo(skb)->frag_list; | |
1770 | while (len) { | |
1771 | count = min_t(unsigned int, conn->mtu, len); | |
1772 | ||
1773 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1774 | if (!*frag) | |
1775 | goto fail; | |
1776 | ||
1777 | memcpy(skb_put(*frag, count), data, count); | |
1778 | ||
1779 | len -= count; | |
1780 | data += count; | |
1781 | ||
1782 | frag = &(*frag)->next; | |
1783 | } | |
1784 | ||
1785 | return skb; | |
1786 | ||
1787 | fail: | |
1788 | kfree_skb(skb); | |
1789 | return NULL; | |
1790 | } | |
1791 | ||
1792 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1793 | { | |
1794 | struct l2cap_conf_opt *opt = *ptr; | |
1795 | int len; | |
1796 | ||
1797 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1798 | *ptr += len; | |
1799 | ||
1800 | *type = opt->type; | |
1801 | *olen = opt->len; | |
1802 | ||
1803 | switch (opt->len) { | |
1804 | case 1: | |
1805 | *val = *((u8 *) opt->val); | |
1806 | break; | |
1807 | ||
1808 | case 2: | |
bfaaeb3e | 1809 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1810 | break; |
1811 | ||
1812 | case 4: | |
bfaaeb3e | 1813 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1814 | break; |
1815 | ||
1816 | default: | |
1817 | *val = (unsigned long) opt->val; | |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1822 | return len; | |
1823 | } | |
1824 | ||
1da177e4 LT |
1825 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1826 | { | |
1827 | struct l2cap_conf_opt *opt = *ptr; | |
1828 | ||
1829 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1830 | ||
1831 | opt->type = type; | |
1832 | opt->len = len; | |
1833 | ||
1834 | switch (len) { | |
1835 | case 1: | |
1836 | *((u8 *) opt->val) = val; | |
1837 | break; | |
1838 | ||
1839 | case 2: | |
4f8b691c | 1840 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1841 | break; |
1842 | ||
1843 | case 4: | |
4f8b691c | 1844 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1845 | break; |
1846 | ||
1847 | default: | |
1848 | memcpy(opt->val, (void *) val, len); | |
1849 | break; | |
1850 | } | |
1851 | ||
1852 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1853 | } | |
1854 | ||
c1b4f43b GP |
1855 | static void l2cap_ack_timeout(unsigned long arg) |
1856 | { | |
525cd185 | 1857 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1858 | |
525cd185 GP |
1859 | bh_lock_sock(chan->sk); |
1860 | l2cap_send_ack(chan); | |
1861 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1862 | } |
1863 | ||
525cd185 | 1864 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1865 | { |
525cd185 GP |
1866 | struct sock *sk = chan->sk; |
1867 | ||
42e5c802 | 1868 | chan->expected_ack_seq = 0; |
6a026610 | 1869 | chan->unacked_frames = 0; |
42e5c802 | 1870 | chan->buffer_seq = 0; |
6a026610 GP |
1871 | chan->num_acked = 0; |
1872 | chan->frames_sent = 0; | |
0565c1c2 | 1873 | |
e92c8e70 GP |
1874 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1875 | (unsigned long) chan); | |
1876 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1877 | (unsigned long) chan); | |
1878 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1879 | |
f1c6775b | 1880 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 1881 | |
39d5a3ee GP |
1882 | INIT_LIST_HEAD(&chan->srej_l); |
1883 | ||
218bb9df GP |
1884 | |
1885 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1886 | } |
1887 | ||
f2fcfcd6 GP |
1888 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1889 | { | |
1890 | switch (mode) { | |
1891 | case L2CAP_MODE_STREAMING: | |
1892 | case L2CAP_MODE_ERTM: | |
1893 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1894 | return mode; | |
1895 | /* fall through */ | |
1896 | default: | |
1897 | return L2CAP_MODE_BASIC; | |
1898 | } | |
1899 | } | |
1900 | ||
6327eb98 AE |
1901 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
1902 | { | |
1903 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
1904 | } | |
1905 | ||
1906 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) | |
1907 | { | |
1908 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
1909 | __l2cap_ews_supported(chan)) | |
1910 | /* use extended control field */ | |
1911 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
1912 | else | |
1913 | chan->tx_win = min_t(u16, chan->tx_win, | |
1914 | L2CAP_DEFAULT_TX_WINDOW); | |
1915 | } | |
1916 | ||
710f9b0a | 1917 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1918 | { |
1da177e4 | 1919 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1920 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1921 | void *ptr = req->data; |
1922 | ||
49208c9c | 1923 | BT_DBG("chan %p", chan); |
1da177e4 | 1924 | |
73ffa904 | 1925 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1926 | goto done; |
1927 | ||
0c1bc5c6 | 1928 | switch (chan->mode) { |
f2fcfcd6 GP |
1929 | case L2CAP_MODE_STREAMING: |
1930 | case L2CAP_MODE_ERTM: | |
c1360a1c | 1931 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 1932 | break; |
85eb53c6 | 1933 | |
2ba13ed6 | 1934 | /* fall through */ |
f2fcfcd6 | 1935 | default: |
8c1d787b | 1936 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
1937 | break; |
1938 | } | |
1939 | ||
1940 | done: | |
0c1bc5c6 GP |
1941 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1942 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1943 | |
0c1bc5c6 | 1944 | switch (chan->mode) { |
65c7c491 | 1945 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
1946 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1947 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
1948 | break; |
1949 | ||
62547752 GP |
1950 | rfc.mode = L2CAP_MODE_BASIC; |
1951 | rfc.txwin_size = 0; | |
1952 | rfc.max_transmit = 0; | |
1953 | rfc.retrans_timeout = 0; | |
1954 | rfc.monitor_timeout = 0; | |
1955 | rfc.max_pdu_size = 0; | |
1956 | ||
63406504 GP |
1957 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1958 | (unsigned long) &rfc); | |
65c7c491 MH |
1959 | break; |
1960 | ||
1961 | case L2CAP_MODE_ERTM: | |
1962 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 1963 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
1964 | rfc.retrans_timeout = 0; |
1965 | rfc.monitor_timeout = 0; | |
c74e560c | 1966 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1967 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1968 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
f2fcfcd6 | 1969 | |
6327eb98 AE |
1970 | l2cap_txwin_setup(chan); |
1971 | ||
1972 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
1973 | L2CAP_DEFAULT_TX_WINDOW); | |
1974 | ||
63406504 GP |
1975 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1976 | (unsigned long) &rfc); | |
1977 | ||
8c1d787b | 1978 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1979 | break; |
1980 | ||
47d1ec61 | 1981 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 1982 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
1983 | chan->fcs = L2CAP_FCS_NONE; |
1984 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1985 | } |
6327eb98 AE |
1986 | |
1987 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1988 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
1989 | chan->tx_win); | |
f2fcfcd6 GP |
1990 | break; |
1991 | ||
1992 | case L2CAP_MODE_STREAMING: | |
1993 | rfc.mode = L2CAP_MODE_STREAMING; | |
1994 | rfc.txwin_size = 0; | |
1995 | rfc.max_transmit = 0; | |
1996 | rfc.retrans_timeout = 0; | |
1997 | rfc.monitor_timeout = 0; | |
c74e560c | 1998 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1999 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
2000 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
65c7c491 | 2001 | |
63406504 GP |
2002 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2003 | (unsigned long) &rfc); | |
2004 | ||
8c1d787b | 2005 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2006 | break; |
2007 | ||
47d1ec61 | 2008 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2009 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2010 | chan->fcs = L2CAP_FCS_NONE; |
2011 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2012 | } |
65c7c491 MH |
2013 | break; |
2014 | } | |
1da177e4 | 2015 | |
fe4128e0 | 2016 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2017 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2018 | |
2019 | return ptr - data; | |
2020 | } | |
2021 | ||
73ffa904 | 2022 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2023 | { |
5dee9e7c MH |
2024 | struct l2cap_conf_rsp *rsp = data; |
2025 | void *ptr = rsp->data; | |
73ffa904 GP |
2026 | void *req = chan->conf_req; |
2027 | int len = chan->conf_len; | |
5dee9e7c MH |
2028 | int type, hint, olen; |
2029 | unsigned long val; | |
6464f35f | 2030 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2031 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2032 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2033 | |
73ffa904 | 2034 | BT_DBG("chan %p", chan); |
820ae1b8 | 2035 | |
5dee9e7c MH |
2036 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2037 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2038 | |
589d2746 | 2039 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2040 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2041 | |
2042 | switch (type) { | |
2043 | case L2CAP_CONF_MTU: | |
861d6882 | 2044 | mtu = val; |
5dee9e7c MH |
2045 | break; |
2046 | ||
2047 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2048 | chan->flush_to = val; |
5dee9e7c MH |
2049 | break; |
2050 | ||
2051 | case L2CAP_CONF_QOS: | |
2052 | break; | |
2053 | ||
6464f35f MH |
2054 | case L2CAP_CONF_RFC: |
2055 | if (olen == sizeof(rfc)) | |
2056 | memcpy(&rfc, (void *) val, olen); | |
2057 | break; | |
2058 | ||
fcc203c3 GP |
2059 | case L2CAP_CONF_FCS: |
2060 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2061 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
fcc203c3 GP |
2062 | |
2063 | break; | |
2064 | ||
6327eb98 AE |
2065 | case L2CAP_CONF_EWS: |
2066 | if (!enable_hs) | |
2067 | return -ECONNREFUSED; | |
2068 | ||
2069 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
2070 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
2071 | chan->remote_tx_win = val; | |
2072 | break; | |
2073 | ||
5dee9e7c MH |
2074 | default: |
2075 | if (hint) | |
2076 | break; | |
2077 | ||
2078 | result = L2CAP_CONF_UNKNOWN; | |
2079 | *((u8 *) ptr++) = type; | |
2080 | break; | |
2081 | } | |
2082 | } | |
2083 | ||
73ffa904 | 2084 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2085 | goto done; |
2086 | ||
0c1bc5c6 | 2087 | switch (chan->mode) { |
f2fcfcd6 GP |
2088 | case L2CAP_MODE_STREAMING: |
2089 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2090 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2091 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2092 | chan->conn->feat_mask); |
85eb53c6 GP |
2093 | break; |
2094 | } | |
2095 | ||
0c1bc5c6 | 2096 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2097 | return -ECONNREFUSED; |
742e519b | 2098 | |
f2fcfcd6 | 2099 | break; |
f2fcfcd6 GP |
2100 | } |
2101 | ||
2102 | done: | |
0c1bc5c6 | 2103 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2104 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2105 | rfc.mode = chan->mode; |
f2fcfcd6 | 2106 | |
73ffa904 | 2107 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2108 | return -ECONNREFUSED; |
2109 | ||
2110 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2111 | sizeof(rfc), (unsigned long) &rfc); | |
2112 | } | |
2113 | ||
2114 | ||
5dee9e7c MH |
2115 | if (result == L2CAP_CONF_SUCCESS) { |
2116 | /* Configure output options and let the other side know | |
2117 | * which ones we don't like. */ | |
2118 | ||
f2fcfcd6 GP |
2119 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2120 | result = L2CAP_CONF_UNACCEPT; | |
2121 | else { | |
0c1bc5c6 | 2122 | chan->omtu = mtu; |
c1360a1c | 2123 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2124 | } |
0c1bc5c6 | 2125 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2126 | |
f2fcfcd6 GP |
2127 | switch (rfc.mode) { |
2128 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2129 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2130 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2131 | break; |
2132 | ||
2133 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2134 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2135 | chan->remote_tx_win = rfc.txwin_size; | |
2136 | else | |
2137 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
2138 | ||
2c03a7a4 | 2139 | chan->remote_max_tx = rfc.max_transmit; |
86b1b263 | 2140 | |
8c1d787b GP |
2141 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2142 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2143 | |
2c03a7a4 | 2144 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2145 | |
10467e9e GP |
2146 | rfc.retrans_timeout = |
2147 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2148 | rfc.monitor_timeout = | |
2149 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2150 | |
c1360a1c | 2151 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2152 | |
2153 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2154 | sizeof(rfc), (unsigned long) &rfc); | |
2155 | ||
f2fcfcd6 GP |
2156 | break; |
2157 | ||
2158 | case L2CAP_MODE_STREAMING: | |
8c1d787b GP |
2159 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2160 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2161 | |
2c03a7a4 | 2162 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2163 | |
c1360a1c | 2164 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2165 | |
2166 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2167 | sizeof(rfc), (unsigned long) &rfc); | |
2168 | ||
f2fcfcd6 GP |
2169 | break; |
2170 | ||
2171 | default: | |
5dee9e7c | 2172 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2173 | |
6464f35f | 2174 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2175 | rfc.mode = chan->mode; |
f2fcfcd6 | 2176 | } |
6464f35f | 2177 | |
f2fcfcd6 | 2178 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2179 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2180 | } |
fe4128e0 | 2181 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2182 | rsp->result = cpu_to_le16(result); |
2183 | rsp->flags = cpu_to_le16(0x0000); | |
2184 | ||
2185 | return ptr - data; | |
1da177e4 LT |
2186 | } |
2187 | ||
b4450035 | 2188 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2189 | { |
f2fcfcd6 GP |
2190 | struct l2cap_conf_req *req = data; |
2191 | void *ptr = req->data; | |
2192 | int type, olen; | |
2193 | unsigned long val; | |
2194 | struct l2cap_conf_rfc rfc; | |
2195 | ||
fe4128e0 | 2196 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2197 | |
2198 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2199 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2200 | ||
2201 | switch (type) { | |
2202 | case L2CAP_CONF_MTU: | |
2203 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2204 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2205 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2206 | } else |
0c1bc5c6 GP |
2207 | chan->imtu = val; |
2208 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2209 | break; |
2210 | ||
2211 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2212 | chan->flush_to = val; |
f2fcfcd6 | 2213 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2214 | 2, chan->flush_to); |
f2fcfcd6 GP |
2215 | break; |
2216 | ||
2217 | case L2CAP_CONF_RFC: | |
2218 | if (olen == sizeof(rfc)) | |
2219 | memcpy(&rfc, (void *)val, olen); | |
2220 | ||
c1360a1c | 2221 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2222 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2223 | return -ECONNREFUSED; |
2224 | ||
47d1ec61 | 2225 | chan->fcs = 0; |
f2fcfcd6 GP |
2226 | |
2227 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2228 | sizeof(rfc), (unsigned long) &rfc); | |
2229 | break; | |
6327eb98 AE |
2230 | |
2231 | case L2CAP_CONF_EWS: | |
2232 | chan->tx_win = min_t(u16, val, | |
2233 | L2CAP_DEFAULT_EXT_WINDOW); | |
2234 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, | |
2235 | 2, chan->tx_win); | |
2236 | break; | |
f2fcfcd6 GP |
2237 | } |
2238 | } | |
2239 | ||
0c1bc5c6 | 2240 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2241 | return -ECONNREFUSED; |
2242 | ||
0c1bc5c6 | 2243 | chan->mode = rfc.mode; |
6c2ea7a8 | 2244 | |
f2fcfcd6 GP |
2245 | if (*result == L2CAP_CONF_SUCCESS) { |
2246 | switch (rfc.mode) { | |
2247 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2248 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2249 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2250 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2251 | break; |
2252 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2253 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2254 | } |
2255 | } | |
2256 | ||
fe4128e0 | 2257 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2258 | req->flags = cpu_to_le16(0x0000); |
2259 | ||
2260 | return ptr - data; | |
2261 | } | |
2262 | ||
fe4128e0 | 2263 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2264 | { |
2265 | struct l2cap_conf_rsp *rsp = data; | |
2266 | void *ptr = rsp->data; | |
1da177e4 | 2267 | |
fe4128e0 | 2268 | BT_DBG("chan %p", chan); |
1da177e4 | 2269 | |
fe4128e0 | 2270 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2271 | rsp->result = cpu_to_le16(result); |
aca3192c | 2272 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2273 | |
2274 | return ptr - data; | |
2275 | } | |
2276 | ||
8c1d787b | 2277 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2278 | { |
2279 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2280 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2281 | u8 buf[128]; |
2282 | ||
fe4128e0 GP |
2283 | rsp.scid = cpu_to_le16(chan->dcid); |
2284 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2285 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2286 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2287 | l2cap_send_cmd(conn, chan->ident, | |
2288 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2289 | ||
c1360a1c | 2290 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2291 | return; |
2292 | ||
710f9b0a GP |
2293 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2294 | l2cap_build_conf_req(chan, buf), buf); | |
2295 | chan->num_conf_req++; | |
2296 | } | |
2297 | ||
47d1ec61 | 2298 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2299 | { |
7b1c0049 GP |
2300 | int type, olen; |
2301 | unsigned long val; | |
2302 | struct l2cap_conf_rfc rfc; | |
2303 | ||
47d1ec61 | 2304 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2305 | |
0c1bc5c6 | 2306 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2307 | return; |
2308 | ||
2309 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2310 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2311 | ||
2312 | switch (type) { | |
2313 | case L2CAP_CONF_RFC: | |
2314 | if (olen == sizeof(rfc)) | |
2315 | memcpy(&rfc, (void *)val, olen); | |
2316 | goto done; | |
2317 | } | |
2318 | } | |
2319 | ||
2320 | done: | |
2321 | switch (rfc.mode) { | |
2322 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2323 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2324 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2325 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2326 | break; |
2327 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2328 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2329 | } |
2330 | } | |
2331 | ||
4e8402a3 MH |
2332 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2333 | { | |
e2fd318e | 2334 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2335 | |
e2fd318e | 2336 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2337 | return 0; |
2338 | ||
2339 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2340 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2341 | del_timer(&conn->info_timer); |
984947dc MH |
2342 | |
2343 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2344 | conn->info_ident = 0; |
984947dc | 2345 | |
4e8402a3 MH |
2346 | l2cap_conn_start(conn); |
2347 | } | |
2348 | ||
2349 | return 0; | |
2350 | } | |
2351 | ||
1da177e4 LT |
2352 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2353 | { | |
1da177e4 LT |
2354 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2355 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2356 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2357 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2358 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2359 | |
2360 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2361 | __le16 psm = req->psm; |
1da177e4 LT |
2362 | |
2363 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2364 | ||
2365 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2366 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2367 | if (!pchan) { | |
1da177e4 LT |
2368 | result = L2CAP_CR_BAD_PSM; |
2369 | goto sendresp; | |
2370 | } | |
2371 | ||
23691d75 GP |
2372 | parent = pchan->sk; |
2373 | ||
e0f0cb56 GP |
2374 | bh_lock_sock(parent); |
2375 | ||
e7c29cb1 MH |
2376 | /* Check if the ACL is secure enough (if not SDP) */ |
2377 | if (psm != cpu_to_le16(0x0001) && | |
2378 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2379 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2380 | result = L2CAP_CR_SEC_BLOCK; |
2381 | goto response; | |
2382 | } | |
2383 | ||
1da177e4 LT |
2384 | result = L2CAP_CR_NO_MEM; |
2385 | ||
2386 | /* Check for backlog size */ | |
2387 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2388 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2389 | goto response; |
2390 | } | |
2391 | ||
80808e43 GP |
2392 | chan = pchan->ops->new_connection(pchan->data); |
2393 | if (!chan) | |
1da177e4 LT |
2394 | goto response; |
2395 | ||
80808e43 GP |
2396 | sk = chan->sk; |
2397 | ||
baa7e1fa | 2398 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2399 | |
2400 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2401 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2402 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2403 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2404 | chan->ops->close(chan->data); |
1da177e4 LT |
2405 | goto response; |
2406 | } | |
2407 | ||
2408 | hci_conn_hold(conn->hcon); | |
2409 | ||
1da177e4 LT |
2410 | bacpy(&bt_sk(sk)->src, conn->src); |
2411 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2412 | chan->psm = psm; |
2413 | chan->dcid = scid; | |
1da177e4 | 2414 | |
d1010240 GP |
2415 | bt_accept_enqueue(parent, sk); |
2416 | ||
48454079 GP |
2417 | __l2cap_chan_add(conn, chan); |
2418 | ||
fe4128e0 | 2419 | dcid = chan->scid; |
1da177e4 | 2420 | |
c9b66675 | 2421 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2422 | |
fc7f8a7e | 2423 | chan->ident = cmd->ident; |
1da177e4 | 2424 | |
984947dc | 2425 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2426 | if (l2cap_check_security(chan)) { |
f66dc81f | 2427 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2428 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2429 | result = L2CAP_CR_PEND; |
2430 | status = L2CAP_CS_AUTHOR_PEND; | |
2431 | parent->sk_data_ready(parent, 0); | |
2432 | } else { | |
89bc500e | 2433 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2434 | result = L2CAP_CR_SUCCESS; |
2435 | status = L2CAP_CS_NO_INFO; | |
2436 | } | |
79d554a6 | 2437 | } else { |
89bc500e | 2438 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2439 | result = L2CAP_CR_PEND; |
2440 | status = L2CAP_CS_AUTHEN_PEND; | |
2441 | } | |
2442 | } else { | |
89bc500e | 2443 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2444 | result = L2CAP_CR_PEND; |
2445 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2446 | } |
2447 | ||
baa7e1fa | 2448 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2449 | |
2450 | response: | |
2451 | bh_unlock_sock(parent); | |
2452 | ||
2453 | sendresp: | |
aca3192c YH |
2454 | rsp.scid = cpu_to_le16(scid); |
2455 | rsp.dcid = cpu_to_le16(dcid); | |
2456 | rsp.result = cpu_to_le16(result); | |
2457 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2458 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2459 | |
2460 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2461 | struct l2cap_info_req info; | |
2462 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2463 | ||
2464 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2465 | conn->info_ident = l2cap_get_ident(conn); | |
2466 | ||
2467 | mod_timer(&conn->info_timer, jiffies + | |
2468 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2469 | ||
2470 | l2cap_send_cmd(conn, conn->info_ident, | |
2471 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2472 | } | |
2473 | ||
c1360a1c | 2474 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2475 | result == L2CAP_CR_SUCCESS) { |
2476 | u8 buf[128]; | |
c1360a1c | 2477 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2478 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2479 | l2cap_build_conf_req(chan, buf), buf); |
2480 | chan->num_conf_req++; | |
e9aeb2dd GP |
2481 | } |
2482 | ||
1da177e4 LT |
2483 | return 0; |
2484 | } | |
2485 | ||
2486 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2487 | { | |
2488 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2489 | u16 scid, dcid, result, status; | |
48454079 | 2490 | struct l2cap_chan *chan; |
1da177e4 LT |
2491 | struct sock *sk; |
2492 | u8 req[128]; | |
2493 | ||
2494 | scid = __le16_to_cpu(rsp->scid); | |
2495 | dcid = __le16_to_cpu(rsp->dcid); | |
2496 | result = __le16_to_cpu(rsp->result); | |
2497 | status = __le16_to_cpu(rsp->status); | |
2498 | ||
2499 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2500 | ||
2501 | if (scid) { | |
baa7e1fa | 2502 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2503 | if (!chan) |
57d3b22b | 2504 | return -EFAULT; |
1da177e4 | 2505 | } else { |
baa7e1fa | 2506 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2507 | if (!chan) |
57d3b22b | 2508 | return -EFAULT; |
1da177e4 LT |
2509 | } |
2510 | ||
48454079 GP |
2511 | sk = chan->sk; |
2512 | ||
1da177e4 LT |
2513 | switch (result) { |
2514 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2515 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2516 | chan->ident = 0; |
fe4128e0 | 2517 | chan->dcid = dcid; |
c1360a1c | 2518 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2519 | |
c1360a1c | 2520 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2521 | break; |
2522 | ||
1da177e4 | 2523 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2524 | l2cap_build_conf_req(chan, req), req); |
2525 | chan->num_conf_req++; | |
1da177e4 LT |
2526 | break; |
2527 | ||
2528 | case L2CAP_CR_PEND: | |
c1360a1c | 2529 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2530 | break; |
2531 | ||
2532 | default: | |
a49184c2 AE |
2533 | /* don't delete l2cap channel if sk is owned by user */ |
2534 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2535 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2536 | __clear_chan_timer(chan); |
2537 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2538 | break; |
2539 | } | |
2540 | ||
48454079 | 2541 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2542 | break; |
2543 | } | |
2544 | ||
2545 | bh_unlock_sock(sk); | |
2546 | return 0; | |
2547 | } | |
2548 | ||
47d1ec61 | 2549 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2550 | { |
2551 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2552 | * sides request it. | |
2553 | */ | |
0c1bc5c6 | 2554 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2555 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2556 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2557 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2558 | } |
2559 | ||
88219a0f | 2560 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2561 | { |
2562 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2563 | u16 dcid, flags; | |
2564 | u8 rsp[64]; | |
48454079 | 2565 | struct l2cap_chan *chan; |
1da177e4 | 2566 | struct sock *sk; |
5dee9e7c | 2567 | int len; |
1da177e4 LT |
2568 | |
2569 | dcid = __le16_to_cpu(req->dcid); | |
2570 | flags = __le16_to_cpu(req->flags); | |
2571 | ||
2572 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2573 | ||
baa7e1fa | 2574 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2575 | if (!chan) |
1da177e4 LT |
2576 | return -ENOENT; |
2577 | ||
48454079 GP |
2578 | sk = chan->sk; |
2579 | ||
033b1142 | 2580 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2581 | struct l2cap_cmd_rej_cid rej; |
2582 | ||
2583 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2584 | rej.scid = cpu_to_le16(chan->scid); | |
2585 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2586 | |
df6bd743 GP |
2587 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2588 | sizeof(rej), &rej); | |
354f60a9 | 2589 | goto unlock; |
df6bd743 | 2590 | } |
354f60a9 | 2591 | |
5dee9e7c | 2592 | /* Reject if config buffer is too small. */ |
88219a0f | 2593 | len = cmd_len - sizeof(*req); |
7ac28817 | 2594 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2595 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2596 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2597 | L2CAP_CONF_REJECT, flags), rsp); |
2598 | goto unlock; | |
2599 | } | |
2600 | ||
2601 | /* Store config. */ | |
73ffa904 GP |
2602 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2603 | chan->conf_len += len; | |
1da177e4 LT |
2604 | |
2605 | if (flags & 0x0001) { | |
2606 | /* Incomplete config. Send empty response. */ | |
2607 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2608 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2609 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2610 | goto unlock; |
2611 | } | |
2612 | ||
2613 | /* Complete config. */ | |
73ffa904 | 2614 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2615 | if (len < 0) { |
e92c8e70 | 2616 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2617 | goto unlock; |
f2fcfcd6 | 2618 | } |
1da177e4 | 2619 | |
5dee9e7c | 2620 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2621 | chan->num_conf_rsp++; |
5dee9e7c | 2622 | |
5dee9e7c | 2623 | /* Reset config buffer. */ |
73ffa904 | 2624 | chan->conf_len = 0; |
5dee9e7c | 2625 | |
c1360a1c | 2626 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2627 | goto unlock; |
2628 | ||
c1360a1c | 2629 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2630 | set_default_fcs(chan); |
fcc203c3 | 2631 | |
89bc500e | 2632 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2633 | |
42e5c802 GP |
2634 | chan->next_tx_seq = 0; |
2635 | chan->expected_tx_seq = 0; | |
58d35f87 | 2636 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2637 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2638 | l2cap_ertm_init(chan); |
0565c1c2 | 2639 | |
1da177e4 | 2640 | l2cap_chan_ready(sk); |
876d9484 MH |
2641 | goto unlock; |
2642 | } | |
2643 | ||
c1360a1c | 2644 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2645 | u8 buf[64]; |
1da177e4 | 2646 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2647 | l2cap_build_conf_req(chan, buf), buf); |
2648 | chan->num_conf_req++; | |
1da177e4 LT |
2649 | } |
2650 | ||
2651 | unlock: | |
2652 | bh_unlock_sock(sk); | |
2653 | return 0; | |
2654 | } | |
2655 | ||
2656 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2657 | { | |
2658 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2659 | u16 scid, flags, result; | |
48454079 | 2660 | struct l2cap_chan *chan; |
1da177e4 | 2661 | struct sock *sk; |
7b1c0049 | 2662 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2663 | |
2664 | scid = __le16_to_cpu(rsp->scid); | |
2665 | flags = __le16_to_cpu(rsp->flags); | |
2666 | result = __le16_to_cpu(rsp->result); | |
2667 | ||
af05b30b GP |
2668 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2669 | scid, flags, result); | |
1da177e4 | 2670 | |
baa7e1fa | 2671 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2672 | if (!chan) |
1da177e4 LT |
2673 | return 0; |
2674 | ||
48454079 GP |
2675 | sk = chan->sk; |
2676 | ||
1da177e4 LT |
2677 | switch (result) { |
2678 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2679 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2680 | break; |
2681 | ||
2682 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2683 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2684 | char req[64]; |
2685 | ||
c2c77ec8 | 2686 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2687 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2688 | goto done; |
2689 | } | |
2690 | ||
f2fcfcd6 GP |
2691 | /* throw out any old stored conf requests */ |
2692 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2693 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2694 | req, &result); | |
f2fcfcd6 | 2695 | if (len < 0) { |
e92c8e70 | 2696 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2697 | goto done; |
2698 | } | |
2699 | ||
2700 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2701 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2702 | chan->num_conf_req++; |
f2fcfcd6 GP |
2703 | if (result != L2CAP_CONF_SUCCESS) |
2704 | goto done; | |
2705 | break; | |
1da177e4 LT |
2706 | } |
2707 | ||
8e87d142 | 2708 | default: |
b1235d79 | 2709 | sk->sk_err = ECONNRESET; |
c9b66675 | 2710 | __set_chan_timer(chan, HZ * 5); |
e92c8e70 | 2711 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2712 | goto done; |
2713 | } | |
2714 | ||
2715 | if (flags & 0x01) | |
2716 | goto done; | |
2717 | ||
c1360a1c | 2718 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2719 | |
c1360a1c | 2720 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2721 | set_default_fcs(chan); |
fcc203c3 | 2722 | |
89bc500e | 2723 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2724 | chan->next_tx_seq = 0; |
2725 | chan->expected_tx_seq = 0; | |
58d35f87 | 2726 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2727 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2728 | l2cap_ertm_init(chan); |
0565c1c2 | 2729 | |
1da177e4 LT |
2730 | l2cap_chan_ready(sk); |
2731 | } | |
2732 | ||
2733 | done: | |
2734 | bh_unlock_sock(sk); | |
2735 | return 0; | |
2736 | } | |
2737 | ||
2738 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2739 | { | |
2740 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2741 | struct l2cap_disconn_rsp rsp; | |
2742 | u16 dcid, scid; | |
48454079 | 2743 | struct l2cap_chan *chan; |
1da177e4 LT |
2744 | struct sock *sk; |
2745 | ||
2746 | scid = __le16_to_cpu(req->scid); | |
2747 | dcid = __le16_to_cpu(req->dcid); | |
2748 | ||
2749 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2750 | ||
baa7e1fa | 2751 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2752 | if (!chan) |
1da177e4 LT |
2753 | return 0; |
2754 | ||
48454079 GP |
2755 | sk = chan->sk; |
2756 | ||
fe4128e0 GP |
2757 | rsp.dcid = cpu_to_le16(chan->scid); |
2758 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2759 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2760 | ||
2761 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2762 | ||
a49184c2 AE |
2763 | /* don't delete l2cap channel if sk is owned by user */ |
2764 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2765 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2766 | __clear_chan_timer(chan); |
2767 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2768 | bh_unlock_sock(sk); |
2769 | return 0; | |
2770 | } | |
2771 | ||
48454079 | 2772 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2773 | bh_unlock_sock(sk); |
2774 | ||
ba3bd0ee | 2775 | chan->ops->close(chan->data); |
1da177e4 LT |
2776 | return 0; |
2777 | } | |
2778 | ||
2779 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2780 | { | |
2781 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2782 | u16 dcid, scid; | |
48454079 | 2783 | struct l2cap_chan *chan; |
1da177e4 LT |
2784 | struct sock *sk; |
2785 | ||
2786 | scid = __le16_to_cpu(rsp->scid); | |
2787 | dcid = __le16_to_cpu(rsp->dcid); | |
2788 | ||
2789 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2790 | ||
baa7e1fa | 2791 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2792 | if (!chan) |
1da177e4 LT |
2793 | return 0; |
2794 | ||
48454079 GP |
2795 | sk = chan->sk; |
2796 | ||
a49184c2 AE |
2797 | /* don't delete l2cap channel if sk is owned by user */ |
2798 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2799 | l2cap_state_change(chan,BT_DISCONN); |
c9b66675 GP |
2800 | __clear_chan_timer(chan); |
2801 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2802 | bh_unlock_sock(sk); |
2803 | return 0; | |
2804 | } | |
2805 | ||
48454079 | 2806 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2807 | bh_unlock_sock(sk); |
2808 | ||
ba3bd0ee | 2809 | chan->ops->close(chan->data); |
1da177e4 LT |
2810 | return 0; |
2811 | } | |
2812 | ||
2813 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2814 | { | |
2815 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2816 | u16 type; |
2817 | ||
2818 | type = __le16_to_cpu(req->type); | |
2819 | ||
2820 | BT_DBG("type 0x%4.4x", type); | |
2821 | ||
f0709e03 MH |
2822 | if (type == L2CAP_IT_FEAT_MASK) { |
2823 | u8 buf[8]; | |
44dd46de | 2824 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2825 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2826 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2827 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2828 | if (!disable_ertm) |
fcc203c3 GP |
2829 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2830 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 2831 | if (enable_hs) |
6327eb98 AE |
2832 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2833 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 2834 | |
1b7bf4ed | 2835 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2836 | l2cap_send_cmd(conn, cmd->ident, |
2837 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2838 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2839 | u8 buf[12]; | |
2840 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2841 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2842 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2843 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2844 | l2cap_send_cmd(conn, cmd->ident, | |
2845 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2846 | } else { |
2847 | struct l2cap_info_rsp rsp; | |
2848 | rsp.type = cpu_to_le16(type); | |
2849 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2850 | l2cap_send_cmd(conn, cmd->ident, | |
2851 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2852 | } | |
1da177e4 LT |
2853 | |
2854 | return 0; | |
2855 | } | |
2856 | ||
2857 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2858 | { | |
2859 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2860 | u16 type, result; | |
2861 | ||
2862 | type = __le16_to_cpu(rsp->type); | |
2863 | result = __le16_to_cpu(rsp->result); | |
2864 | ||
2865 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2866 | ||
e90165be AE |
2867 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2868 | if (cmd->ident != conn->info_ident || | |
2869 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2870 | return 0; | |
2871 | ||
4e8402a3 MH |
2872 | del_timer(&conn->info_timer); |
2873 | ||
adb08ede VT |
2874 | if (result != L2CAP_IR_SUCCESS) { |
2875 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2876 | conn->info_ident = 0; | |
2877 | ||
2878 | l2cap_conn_start(conn); | |
2879 | ||
2880 | return 0; | |
2881 | } | |
2882 | ||
984947dc | 2883 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2884 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2885 | |
47ec1dcd | 2886 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2887 | struct l2cap_info_req req; |
2888 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2889 | ||
2890 | conn->info_ident = l2cap_get_ident(conn); | |
2891 | ||
2892 | l2cap_send_cmd(conn, conn->info_ident, | |
2893 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2894 | } else { | |
2895 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2896 | conn->info_ident = 0; | |
2897 | ||
2898 | l2cap_conn_start(conn); | |
2899 | } | |
2900 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2901 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2902 | conn->info_ident = 0; |
984947dc MH |
2903 | |
2904 | l2cap_conn_start(conn); | |
2905 | } | |
4e8402a3 | 2906 | |
1da177e4 LT |
2907 | return 0; |
2908 | } | |
2909 | ||
e2174ca4 | 2910 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2911 | u16 to_multiplier) |
2912 | { | |
2913 | u16 max_latency; | |
2914 | ||
2915 | if (min > max || min < 6 || max > 3200) | |
2916 | return -EINVAL; | |
2917 | ||
2918 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2919 | return -EINVAL; | |
2920 | ||
2921 | if (max >= to_multiplier * 8) | |
2922 | return -EINVAL; | |
2923 | ||
2924 | max_latency = (to_multiplier * 8 / max) - 1; | |
2925 | if (latency > 499 || latency > max_latency) | |
2926 | return -EINVAL; | |
2927 | ||
2928 | return 0; | |
2929 | } | |
2930 | ||
2931 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2932 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2933 | { | |
2934 | struct hci_conn *hcon = conn->hcon; | |
2935 | struct l2cap_conn_param_update_req *req; | |
2936 | struct l2cap_conn_param_update_rsp rsp; | |
2937 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2938 | int err; |
de73115a CT |
2939 | |
2940 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2941 | return -EINVAL; | |
2942 | ||
2943 | cmd_len = __le16_to_cpu(cmd->len); | |
2944 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2945 | return -EPROTO; | |
2946 | ||
2947 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2948 | min = __le16_to_cpu(req->min); |
2949 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2950 | latency = __le16_to_cpu(req->latency); |
2951 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2952 | ||
2953 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2954 | min, max, latency, to_multiplier); | |
2955 | ||
2956 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2957 | |
2958 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2959 | if (err) | |
de73115a CT |
2960 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2961 | else | |
2962 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2963 | ||
2964 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2965 | sizeof(rsp), &rsp); | |
2966 | ||
2ce603eb CT |
2967 | if (!err) |
2968 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2969 | ||
de73115a CT |
2970 | return 0; |
2971 | } | |
2972 | ||
3300d9a9 CT |
2973 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2974 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2975 | { | |
2976 | int err = 0; | |
2977 | ||
2978 | switch (cmd->code) { | |
2979 | case L2CAP_COMMAND_REJ: | |
2980 | l2cap_command_rej(conn, cmd, data); | |
2981 | break; | |
2982 | ||
2983 | case L2CAP_CONN_REQ: | |
2984 | err = l2cap_connect_req(conn, cmd, data); | |
2985 | break; | |
2986 | ||
2987 | case L2CAP_CONN_RSP: | |
2988 | err = l2cap_connect_rsp(conn, cmd, data); | |
2989 | break; | |
2990 | ||
2991 | case L2CAP_CONF_REQ: | |
2992 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2993 | break; | |
2994 | ||
2995 | case L2CAP_CONF_RSP: | |
2996 | err = l2cap_config_rsp(conn, cmd, data); | |
2997 | break; | |
2998 | ||
2999 | case L2CAP_DISCONN_REQ: | |
3000 | err = l2cap_disconnect_req(conn, cmd, data); | |
3001 | break; | |
3002 | ||
3003 | case L2CAP_DISCONN_RSP: | |
3004 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3005 | break; | |
3006 | ||
3007 | case L2CAP_ECHO_REQ: | |
3008 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3009 | break; | |
3010 | ||
3011 | case L2CAP_ECHO_RSP: | |
3012 | break; | |
3013 | ||
3014 | case L2CAP_INFO_REQ: | |
3015 | err = l2cap_information_req(conn, cmd, data); | |
3016 | break; | |
3017 | ||
3018 | case L2CAP_INFO_RSP: | |
3019 | err = l2cap_information_rsp(conn, cmd, data); | |
3020 | break; | |
3021 | ||
3022 | default: | |
3023 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3024 | err = -EINVAL; | |
3025 | break; | |
3026 | } | |
3027 | ||
3028 | return err; | |
3029 | } | |
3030 | ||
3031 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3032 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3033 | { | |
3034 | switch (cmd->code) { | |
3035 | case L2CAP_COMMAND_REJ: | |
3036 | return 0; | |
3037 | ||
3038 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3039 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3040 | |
3041 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3042 | return 0; | |
3043 | ||
3044 | default: | |
3045 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3046 | return -EINVAL; | |
3047 | } | |
3048 | } | |
3049 | ||
3050 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3051 | struct sk_buff *skb) | |
1da177e4 LT |
3052 | { |
3053 | u8 *data = skb->data; | |
3054 | int len = skb->len; | |
3055 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3056 | int err; |
1da177e4 LT |
3057 | |
3058 | l2cap_raw_recv(conn, skb); | |
3059 | ||
3060 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3061 | u16 cmd_len; |
1da177e4 LT |
3062 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3063 | data += L2CAP_CMD_HDR_SIZE; | |
3064 | len -= L2CAP_CMD_HDR_SIZE; | |
3065 | ||
88219a0f | 3066 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3067 | |
88219a0f | 3068 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3069 | |
88219a0f | 3070 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3071 | BT_DBG("corrupted command"); |
3072 | break; | |
3073 | } | |
3074 | ||
3300d9a9 CT |
3075 | if (conn->hcon->type == LE_LINK) |
3076 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3077 | else | |
3078 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3079 | |
3080 | if (err) { | |
e2fd318e | 3081 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3082 | |
3083 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3084 | |
3085 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3086 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3087 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3088 | } | |
3089 | ||
88219a0f AV |
3090 | data += cmd_len; |
3091 | len -= cmd_len; | |
1da177e4 LT |
3092 | } |
3093 | ||
3094 | kfree_skb(skb); | |
3095 | } | |
3096 | ||
47d1ec61 | 3097 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3098 | { |
3099 | u16 our_fcs, rcv_fcs; | |
3100 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3101 | ||
47d1ec61 | 3102 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
3103 | skb_trim(skb, skb->len - 2); |
3104 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3105 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3106 | ||
3107 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3108 | return -EBADMSG; |
fcc203c3 GP |
3109 | } |
3110 | return 0; | |
3111 | } | |
3112 | ||
525cd185 | 3113 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3114 | { |
d5392c8f GP |
3115 | u16 control = 0; |
3116 | ||
6a026610 | 3117 | chan->frames_sent = 0; |
d5392c8f | 3118 | |
0b209fae | 3119 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3120 | |
e2ab4353 | 3121 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3122 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3123 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3124 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3125 | } |
3126 | ||
e2ab4353 | 3127 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3128 | l2cap_retransmit_frames(chan); |
d5392c8f | 3129 | |
525cd185 | 3130 | l2cap_ertm_send(chan); |
d5392c8f | 3131 | |
e2ab4353 | 3132 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3133 | chan->frames_sent == 0) { |
ab784b73 | 3134 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3135 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3136 | } |
3137 | } | |
3138 | ||
fb45de7d | 3139 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3140 | { |
3141 | struct sk_buff *next_skb; | |
bfbacc11 | 3142 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3143 | |
3144 | bt_cb(skb)->tx_seq = tx_seq; | |
3145 | bt_cb(skb)->sar = sar; | |
3146 | ||
f1c6775b | 3147 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3148 | if (!next_skb) { |
f1c6775b | 3149 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 3150 | return 0; |
8f17154f GP |
3151 | } |
3152 | ||
42e5c802 | 3153 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3154 | if (tx_seq_offset < 0) |
3155 | tx_seq_offset += 64; | |
3156 | ||
8f17154f | 3157 | do { |
9b53350d JPRV |
3158 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3159 | return -EINVAL; | |
3160 | ||
bfbacc11 | 3161 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 3162 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3163 | if (next_tx_seq_offset < 0) |
3164 | next_tx_seq_offset += 64; | |
3165 | ||
3166 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3167 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3168 | return 0; |
8f17154f GP |
3169 | } |
3170 | ||
f1c6775b | 3171 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
3172 | break; |
3173 | ||
f1c6775b | 3174 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 3175 | |
f1c6775b | 3176 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3177 | |
3178 | return 0; | |
8f17154f GP |
3179 | } |
3180 | ||
84084a31 MM |
3181 | static void append_skb_frag(struct sk_buff *skb, |
3182 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3183 | { |
84084a31 MM |
3184 | /* skb->len reflects data in skb as well as all fragments |
3185 | * skb->data_len reflects only data in fragments | |
3186 | */ | |
3187 | if (!skb_has_frag_list(skb)) | |
3188 | skb_shinfo(skb)->frag_list = new_frag; | |
3189 | ||
3190 | new_frag->next = NULL; | |
3191 | ||
3192 | (*last_frag)->next = new_frag; | |
3193 | *last_frag = new_frag; | |
3194 | ||
3195 | skb->len += new_frag->len; | |
3196 | skb->data_len += new_frag->len; | |
3197 | skb->truesize += new_frag->truesize; | |
3198 | } | |
3199 | ||
3200 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) | |
3201 | { | |
3202 | int err = -EINVAL; | |
18778a63 | 3203 | |
7e0ef6ee AE |
3204 | switch (__get_ctrl_sar(chan, control)) { |
3205 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3206 | if (chan->sdu) |
3207 | break; | |
18778a63 | 3208 | |
84084a31 MM |
3209 | err = chan->ops->recv(chan->data, skb); |
3210 | break; | |
18778a63 | 3211 | |
7e0ef6ee | 3212 | case L2CAP_SAR_START: |
84084a31 MM |
3213 | if (chan->sdu) |
3214 | break; | |
18778a63 | 3215 | |
6f61fd47 | 3216 | chan->sdu_len = get_unaligned_le16(skb->data); |
84084a31 | 3217 | skb_pull(skb, 2); |
18778a63 | 3218 | |
84084a31 MM |
3219 | if (chan->sdu_len > chan->imtu) { |
3220 | err = -EMSGSIZE; | |
3221 | break; | |
3222 | } | |
1890d36b | 3223 | |
84084a31 MM |
3224 | if (skb->len >= chan->sdu_len) |
3225 | break; | |
18778a63 | 3226 | |
84084a31 MM |
3227 | chan->sdu = skb; |
3228 | chan->sdu_last_frag = skb; | |
18778a63 | 3229 | |
84084a31 MM |
3230 | skb = NULL; |
3231 | err = 0; | |
18778a63 GP |
3232 | break; |
3233 | ||
7e0ef6ee | 3234 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3235 | if (!chan->sdu) |
84084a31 | 3236 | break; |
18778a63 | 3237 | |
84084a31 MM |
3238 | append_skb_frag(chan->sdu, skb, |
3239 | &chan->sdu_last_frag); | |
3240 | skb = NULL; | |
18778a63 | 3241 | |
84084a31 MM |
3242 | if (chan->sdu->len >= chan->sdu_len) |
3243 | break; | |
4178ba46 | 3244 | |
84084a31 | 3245 | err = 0; |
18778a63 GP |
3246 | break; |
3247 | ||
7e0ef6ee | 3248 | case L2CAP_SAR_END: |
6f61fd47 | 3249 | if (!chan->sdu) |
84084a31 | 3250 | break; |
18778a63 | 3251 | |
84084a31 MM |
3252 | append_skb_frag(chan->sdu, skb, |
3253 | &chan->sdu_last_frag); | |
3254 | skb = NULL; | |
4178ba46 | 3255 | |
84084a31 MM |
3256 | if (chan->sdu->len != chan->sdu_len) |
3257 | break; | |
18778a63 | 3258 | |
84084a31 | 3259 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3260 | |
84084a31 MM |
3261 | if (!err) { |
3262 | /* Reassembly complete */ | |
3263 | chan->sdu = NULL; | |
3264 | chan->sdu_last_frag = NULL; | |
3265 | chan->sdu_len = 0; | |
1890d36b | 3266 | } |
18778a63 GP |
3267 | break; |
3268 | } | |
3269 | ||
84084a31 MM |
3270 | if (err) { |
3271 | kfree_skb(skb); | |
3272 | kfree_skb(chan->sdu); | |
3273 | chan->sdu = NULL; | |
3274 | chan->sdu_last_frag = NULL; | |
3275 | chan->sdu_len = 0; | |
3276 | } | |
18778a63 | 3277 | |
84084a31 | 3278 | return err; |
18778a63 GP |
3279 | } |
3280 | ||
26f880d2 | 3281 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3282 | { |
712132eb | 3283 | u16 control; |
712132eb | 3284 | |
26f880d2 | 3285 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3286 | |
26f880d2 MM |
3287 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3288 | ||
0b209fae | 3289 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 | 3290 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
26f880d2 MM |
3291 | l2cap_send_sframe(chan, control); |
3292 | ||
3293 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3294 | ||
3295 | __clear_ack_timer(chan); | |
3296 | } | |
3297 | ||
3298 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3299 | { | |
3300 | u16 control; | |
712132eb | 3301 | |
e2ab4353 | 3302 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3303 | goto done; |
3304 | ||
0b209fae | 3305 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 AE |
3306 | control |= L2CAP_CTRL_POLL; |
3307 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
525cd185 | 3308 | l2cap_send_sframe(chan, control); |
6a026610 | 3309 | chan->retry_count = 1; |
712132eb | 3310 | |
1a09bcb9 GP |
3311 | __clear_retrans_timer(chan); |
3312 | __set_monitor_timer(chan); | |
712132eb | 3313 | |
e2ab4353 | 3314 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3315 | |
3316 | done: | |
e2ab4353 GP |
3317 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3318 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3319 | |
49208c9c | 3320 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3321 | } |
3322 | ||
e328140f | 3323 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3324 | { |
e328140f MM |
3325 | if (chan->mode == L2CAP_MODE_ERTM) { |
3326 | if (busy) | |
3327 | l2cap_ertm_enter_local_busy(chan); | |
3328 | else | |
3329 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3330 | } |
1890d36b GP |
3331 | } |
3332 | ||
fb45de7d | 3333 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3334 | { |
3335 | struct sk_buff *skb; | |
afefdbc4 | 3336 | u16 control; |
8f17154f | 3337 | |
e328140f MM |
3338 | while ((skb = skb_peek(&chan->srej_q)) && |
3339 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3340 | int err; | |
3341 | ||
8f17154f GP |
3342 | if (bt_cb(skb)->tx_seq != tx_seq) |
3343 | break; | |
3344 | ||
f1c6775b | 3345 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3346 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3347 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3348 | |
3349 | if (err < 0) { | |
3350 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3351 | break; | |
3352 | } | |
3353 | ||
42e5c802 GP |
3354 | chan->buffer_seq_srej = |
3355 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3356 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3357 | } |
3358 | } | |
3359 | ||
fb45de7d | 3360 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3361 | { |
8f17154f GP |
3362 | struct srej_list *l, *tmp; |
3363 | u16 control; | |
3364 | ||
39d5a3ee | 3365 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3366 | if (l->tx_seq == tx_seq) { |
3367 | list_del(&l->list); | |
3368 | kfree(l); | |
3369 | return; | |
3370 | } | |
ab784b73 | 3371 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3372 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3373 | l2cap_send_sframe(chan, control); |
8f17154f | 3374 | list_del(&l->list); |
39d5a3ee | 3375 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3376 | } |
3377 | } | |
3378 | ||
fb45de7d | 3379 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3380 | { |
8f17154f GP |
3381 | struct srej_list *new; |
3382 | u16 control; | |
3383 | ||
42e5c802 | 3384 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3385 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3386 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3387 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3388 | |
3389 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3390 | new->tx_seq = chan->expected_tx_seq; |
3391 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3392 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3393 | } |
42e5c802 | 3394 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3395 | } |
3396 | ||
525cd185 | 3397 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3398 | { |
fb45de7d | 3399 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3400 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3401 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3402 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3403 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3404 | int err = 0; |
3405 | ||
525cd185 GP |
3406 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3407 | tx_seq, rx_control); | |
1c2acffb | 3408 | |
9b16dc65 | 3409 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3410 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3411 | __clear_monitor_timer(chan); |
6a026610 | 3412 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3413 | __set_retrans_timer(chan); |
e2ab4353 | 3414 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3415 | } |
3416 | ||
42e5c802 GP |
3417 | chan->expected_ack_seq = req_seq; |
3418 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3419 | |
42e5c802 | 3420 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3421 | if (tx_seq_offset < 0) |
3422 | tx_seq_offset += 64; | |
3423 | ||
3424 | /* invalid tx_seq */ | |
47d1ec61 | 3425 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3426 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3427 | goto drop; |
3428 | } | |
3429 | ||
e2ab4353 | 3430 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3431 | goto drop; |
3432 | ||
02f1b641 MM |
3433 | if (tx_seq == chan->expected_tx_seq) |
3434 | goto expected; | |
3435 | ||
e2ab4353 | 3436 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3437 | struct srej_list *first; |
30afb5b2 | 3438 | |
39d5a3ee | 3439 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3440 | struct srej_list, list); |
3441 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3442 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3443 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3444 | |
3445 | list_del(&first->list); | |
3446 | kfree(first); | |
3447 | ||
39d5a3ee | 3448 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3449 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3450 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3451 | l2cap_send_ack(chan); |
49208c9c | 3452 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3453 | } |
3454 | } else { | |
3455 | struct srej_list *l; | |
9b53350d JPRV |
3456 | |
3457 | /* duplicated tx_seq */ | |
42e5c802 | 3458 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3459 | goto drop; |
8f17154f | 3460 | |
39d5a3ee | 3461 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3462 | if (l->tx_seq == tx_seq) { |
525cd185 | 3463 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3464 | return 0; |
3465 | } | |
3466 | } | |
525cd185 | 3467 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3468 | } |
3469 | } else { | |
9b53350d | 3470 | expected_tx_seq_offset = |
42e5c802 | 3471 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3472 | if (expected_tx_seq_offset < 0) |
3473 | expected_tx_seq_offset += 64; | |
3474 | ||
3475 | /* duplicated tx_seq */ | |
3476 | if (tx_seq_offset < expected_tx_seq_offset) | |
3477 | goto drop; | |
3478 | ||
e2ab4353 | 3479 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3480 | |
49208c9c | 3481 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3482 | |
39d5a3ee | 3483 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3484 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3485 | |
f1c6775b | 3486 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3487 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3488 | |
e2ab4353 | 3489 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3490 | |
525cd185 | 3491 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3492 | |
1a09bcb9 | 3493 | __clear_ack_timer(chan); |
1c2acffb | 3494 | } |
30afb5b2 GP |
3495 | return 0; |
3496 | ||
8f17154f | 3497 | expected: |
42e5c802 | 3498 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3499 | |
e2ab4353 | 3500 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3501 | bt_cb(skb)->tx_seq = tx_seq; |
3502 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3503 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3504 | return 0; |
3505 | } | |
3506 | ||
84084a31 | 3507 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
fadd192e | 3508 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
e328140f MM |
3509 | if (err < 0) { |
3510 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3511 | return err; | |
3512 | } | |
2ece3684 | 3513 | |
4ec10d97 | 3514 | if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3515 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3516 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3517 | } |
3518 | ||
1a09bcb9 | 3519 | __set_ack_timer(chan); |
c1b4f43b | 3520 | |
6a026610 GP |
3521 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3522 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3523 | l2cap_send_ack(chan); |
9e917af1 | 3524 | |
8f17154f | 3525 | return 0; |
9b53350d JPRV |
3526 | |
3527 | drop: | |
3528 | kfree_skb(skb); | |
3529 | return 0; | |
1c2acffb GP |
3530 | } |
3531 | ||
525cd185 | 3532 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3533 | { |
0b209fae AE |
3534 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, |
3535 | __get_reqseq(chan, rx_control), rx_control); | |
0e98958d | 3536 | |
0b209fae | 3537 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 3538 | l2cap_drop_acked_frames(chan); |
1c2acffb | 3539 | |
e072745f | 3540 | if (rx_control & L2CAP_CTRL_POLL) { |
e2ab4353 GP |
3541 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3542 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3543 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3544 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3545 | __set_retrans_timer(chan); |
05fbd89d | 3546 | |
e2ab4353 | 3547 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 3548 | l2cap_send_srejtail(chan); |
05fbd89d | 3549 | } else { |
525cd185 | 3550 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3551 | } |
1d8f5d16 | 3552 | |
e072745f | 3553 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3554 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 3555 | |
e2ab4353 | 3556 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3557 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3558 | |
e072745f | 3559 | } else { |
e2ab4353 | 3560 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 3561 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3562 | __set_retrans_timer(chan); |
1c2acffb | 3563 | |
e2ab4353 GP |
3564 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
3565 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 3566 | l2cap_send_ack(chan); |
894718a6 | 3567 | else |
525cd185 | 3568 | l2cap_ertm_send(chan); |
e072745f GP |
3569 | } |
3570 | } | |
2246b2f1 | 3571 | |
525cd185 | 3572 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3573 | { |
0b209fae | 3574 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 3575 | |
525cd185 | 3576 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3577 | |
e2ab4353 | 3578 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 3579 | |
42e5c802 GP |
3580 | chan->expected_ack_seq = tx_seq; |
3581 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3582 | |
3583 | if (rx_control & L2CAP_CTRL_FINAL) { | |
e2ab4353 | 3584 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3585 | l2cap_retransmit_frames(chan); |
e072745f | 3586 | } else { |
525cd185 | 3587 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3588 | |
e2ab4353 GP |
3589 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
3590 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
3591 | } |
3592 | } | |
525cd185 | 3593 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3594 | { |
0b209fae | 3595 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 3596 | |
525cd185 | 3597 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3598 | |
e2ab4353 | 3599 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 3600 | |
e072745f | 3601 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3602 | chan->expected_ack_seq = tx_seq; |
3603 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3604 | |
e2ab4353 | 3605 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 3606 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 3607 | |
525cd185 | 3608 | l2cap_ertm_send(chan); |
dfc909be | 3609 | |
e2ab4353 | 3610 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3611 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3612 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3613 | } |
e072745f | 3614 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3615 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 3616 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 3617 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 3618 | else |
525cd185 | 3619 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3620 | } else { |
525cd185 | 3621 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 3622 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3623 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3624 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3625 | } |
e072745f GP |
3626 | } |
3627 | } | |
3628 | ||
525cd185 | 3629 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3630 | { |
0b209fae | 3631 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 3632 | |
525cd185 | 3633 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3634 | |
e2ab4353 | 3635 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
3636 | chan->expected_ack_seq = tx_seq; |
3637 | l2cap_drop_acked_frames(chan); | |
e072745f | 3638 | |
3cb123d1 | 3639 | if (rx_control & L2CAP_CTRL_POLL) |
e2ab4353 | 3640 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 3641 | |
e2ab4353 | 3642 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 3643 | __clear_retrans_timer(chan); |
a2e12a2a | 3644 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3645 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3646 | return; |
e072745f | 3647 | } |
99b0d4b7 | 3648 | |
ab784b73 | 3649 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 | 3650 | l2cap_send_srejtail(chan); |
ab784b73 AE |
3651 | } else { |
3652 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
3653 | l2cap_send_sframe(chan, rx_control); | |
3654 | } | |
e072745f GP |
3655 | } |
3656 | ||
525cd185 | 3657 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3658 | { |
525cd185 | 3659 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3660 | |
9b16dc65 | 3661 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3662 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3663 | __clear_monitor_timer(chan); |
6a026610 | 3664 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3665 | __set_retrans_timer(chan); |
e2ab4353 | 3666 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
3667 | } |
3668 | ||
ab784b73 AE |
3669 | switch (__get_ctrl_super(chan, rx_control)) { |
3670 | case L2CAP_SUPER_RR: | |
525cd185 | 3671 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3672 | break; |
3673 | ||
ab784b73 | 3674 | case L2CAP_SUPER_REJ: |
525cd185 | 3675 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3676 | break; |
2246b2f1 | 3677 | |
ab784b73 | 3678 | case L2CAP_SUPER_SREJ: |
525cd185 | 3679 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3680 | break; |
3681 | ||
ab784b73 | 3682 | case L2CAP_SUPER_RNR: |
525cd185 | 3683 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3684 | break; |
3685 | } | |
3686 | ||
faaebd19 | 3687 | kfree_skb(skb); |
1c2acffb GP |
3688 | return 0; |
3689 | } | |
3690 | ||
218bb9df GP |
3691 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3692 | { | |
525cd185 | 3693 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df | 3694 | u16 control; |
0b209fae | 3695 | u16 req_seq; |
218bb9df GP |
3696 | int len, next_tx_seq_offset, req_seq_offset; |
3697 | ||
3698 | control = get_unaligned_le16(skb->data); | |
3699 | skb_pull(skb, 2); | |
3700 | len = skb->len; | |
3701 | ||
3702 | /* | |
3703 | * We can just drop the corrupted I-frame here. | |
3704 | * Receiver will miss it and start proper recovery | |
3705 | * procedures and ask retransmission. | |
3706 | */ | |
47d1ec61 | 3707 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3708 | goto drop; |
3709 | ||
7e0ef6ee | 3710 | if (__is_sar_start(chan, control) && __is_iframe(control)) |
218bb9df GP |
3711 | len -= 2; |
3712 | ||
47d1ec61 | 3713 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3714 | len -= 2; |
3715 | ||
47d1ec61 | 3716 | if (len > chan->mps) { |
8c1d787b | 3717 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3718 | goto drop; |
3719 | } | |
3720 | ||
0b209fae | 3721 | req_seq = __get_reqseq(chan, control); |
42e5c802 | 3722 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3723 | if (req_seq_offset < 0) |
3724 | req_seq_offset += 64; | |
3725 | ||
3726 | next_tx_seq_offset = | |
42e5c802 | 3727 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3728 | if (next_tx_seq_offset < 0) |
3729 | next_tx_seq_offset += 64; | |
3730 | ||
3731 | /* check for invalid req-seq */ | |
3732 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 3733 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3734 | goto drop; |
3735 | } | |
3736 | ||
3737 | if (__is_iframe(control)) { | |
3738 | if (len < 0) { | |
8c1d787b | 3739 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3740 | goto drop; |
3741 | } | |
3742 | ||
525cd185 | 3743 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3744 | } else { |
3745 | if (len != 0) { | |
3746 | BT_ERR("%d", len); | |
8c1d787b | 3747 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3748 | goto drop; |
3749 | } | |
3750 | ||
525cd185 | 3751 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3752 | } |
3753 | ||
3754 | return 0; | |
3755 | ||
3756 | drop: | |
3757 | kfree_skb(skb); | |
3758 | return 0; | |
3759 | } | |
3760 | ||
1da177e4 LT |
3761 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3762 | { | |
48454079 | 3763 | struct l2cap_chan *chan; |
bf734843 | 3764 | struct sock *sk = NULL; |
51893f88 | 3765 | u16 control; |
fb45de7d | 3766 | u16 tx_seq; |
218bb9df | 3767 | int len; |
1da177e4 | 3768 | |
baa7e1fa | 3769 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3770 | if (!chan) { |
1da177e4 LT |
3771 | BT_DBG("unknown cid 0x%4.4x", cid); |
3772 | goto drop; | |
3773 | } | |
3774 | ||
48454079 | 3775 | sk = chan->sk; |
6840ed07 | 3776 | |
49208c9c | 3777 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 3778 | |
89bc500e | 3779 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
3780 | goto drop; |
3781 | ||
0c1bc5c6 | 3782 | switch (chan->mode) { |
1c2acffb GP |
3783 | case L2CAP_MODE_BASIC: |
3784 | /* If socket recv buffers overflows we drop data here | |
3785 | * which is *bad* because L2CAP has to be reliable. | |
3786 | * But we don't have any other choice. L2CAP doesn't | |
3787 | * provide flow control mechanism. */ | |
1da177e4 | 3788 | |
0c1bc5c6 | 3789 | if (chan->imtu < skb->len) |
1c2acffb | 3790 | goto drop; |
1da177e4 | 3791 | |
23070494 | 3792 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
3793 | goto done; |
3794 | break; | |
3795 | ||
3796 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3797 | if (!sock_owned_by_user(sk)) { |
3798 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3799 | } else { |
218bb9df | 3800 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3801 | goto drop; |
277ffbe3 | 3802 | } |
1c2acffb | 3803 | |
fcafde2e | 3804 | goto done; |
1c2acffb | 3805 | |
6840ed07 GP |
3806 | case L2CAP_MODE_STREAMING: |
3807 | control = get_unaligned_le16(skb->data); | |
3808 | skb_pull(skb, 2); | |
3809 | len = skb->len; | |
3810 | ||
47d1ec61 | 3811 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3812 | goto drop; |
3813 | ||
7e0ef6ee | 3814 | if (__is_sar_start(chan, control)) |
6840ed07 GP |
3815 | len -= 2; |
3816 | ||
47d1ec61 | 3817 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3818 | len -= 2; |
3819 | ||
47d1ec61 | 3820 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3821 | goto drop; |
3822 | ||
fb45de7d | 3823 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 3824 | |
84084a31 MM |
3825 | if (chan->expected_tx_seq != tx_seq) { |
3826 | /* Frame(s) missing - must discard partial SDU */ | |
3827 | kfree_skb(chan->sdu); | |
3828 | chan->sdu = NULL; | |
3829 | chan->sdu_last_frag = NULL; | |
3830 | chan->sdu_len = 0; | |
6840ed07 | 3831 | |
84084a31 MM |
3832 | /* TODO: Notify userland of missing data */ |
3833 | } | |
3834 | ||
3835 | chan->expected_tx_seq = (tx_seq + 1) % 64; | |
3836 | ||
3837 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
3838 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
3839 | |
3840 | goto done; | |
3841 | ||
1c2acffb | 3842 | default: |
0c1bc5c6 | 3843 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3844 | break; |
3845 | } | |
1da177e4 LT |
3846 | |
3847 | drop: | |
3848 | kfree_skb(skb); | |
3849 | ||
3850 | done: | |
0139418c MH |
3851 | if (sk) |
3852 | bh_unlock_sock(sk); | |
3853 | ||
1da177e4 LT |
3854 | return 0; |
3855 | } | |
3856 | ||
8e036fc3 | 3857 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 3858 | { |
6dcae1ea | 3859 | struct sock *sk = NULL; |
23691d75 | 3860 | struct l2cap_chan *chan; |
1da177e4 | 3861 | |
23691d75 GP |
3862 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
3863 | if (!chan) | |
1da177e4 LT |
3864 | goto drop; |
3865 | ||
23691d75 GP |
3866 | sk = chan->sk; |
3867 | ||
e0f0cb56 GP |
3868 | bh_lock_sock(sk); |
3869 | ||
1da177e4 LT |
3870 | BT_DBG("sk %p, len %d", sk, skb->len); |
3871 | ||
89bc500e | 3872 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
3873 | goto drop; |
3874 | ||
e13e21dc | 3875 | if (chan->imtu < skb->len) |
1da177e4 LT |
3876 | goto drop; |
3877 | ||
23070494 | 3878 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
3879 | goto done; |
3880 | ||
3881 | drop: | |
3882 | kfree_skb(skb); | |
3883 | ||
3884 | done: | |
af05b30b GP |
3885 | if (sk) |
3886 | bh_unlock_sock(sk); | |
1da177e4 LT |
3887 | return 0; |
3888 | } | |
3889 | ||
9f69bda6 GP |
3890 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3891 | { | |
6dcae1ea | 3892 | struct sock *sk = NULL; |
23691d75 | 3893 | struct l2cap_chan *chan; |
9f69bda6 | 3894 | |
23691d75 GP |
3895 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
3896 | if (!chan) | |
9f69bda6 GP |
3897 | goto drop; |
3898 | ||
23691d75 GP |
3899 | sk = chan->sk; |
3900 | ||
9f69bda6 GP |
3901 | bh_lock_sock(sk); |
3902 | ||
3903 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3904 | ||
89bc500e | 3905 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
3906 | goto drop; |
3907 | ||
e13e21dc | 3908 | if (chan->imtu < skb->len) |
9f69bda6 GP |
3909 | goto drop; |
3910 | ||
23070494 | 3911 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
3912 | goto done; |
3913 | ||
3914 | drop: | |
3915 | kfree_skb(skb); | |
3916 | ||
3917 | done: | |
3918 | if (sk) | |
3919 | bh_unlock_sock(sk); | |
3920 | return 0; | |
3921 | } | |
3922 | ||
1da177e4 LT |
3923 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3924 | { | |
3925 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3926 | u16 cid, len; |
3927 | __le16 psm; | |
1da177e4 LT |
3928 | |
3929 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3930 | cid = __le16_to_cpu(lh->cid); | |
3931 | len = __le16_to_cpu(lh->len); | |
3932 | ||
1c2acffb GP |
3933 | if (len != skb->len) { |
3934 | kfree_skb(skb); | |
3935 | return; | |
3936 | } | |
3937 | ||
1da177e4 LT |
3938 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3939 | ||
3940 | switch (cid) { | |
3300d9a9 | 3941 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3942 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3943 | l2cap_sig_channel(conn, skb); |
3944 | break; | |
3945 | ||
8db4dc46 | 3946 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3947 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3948 | skb_pull(skb, 2); |
3949 | l2cap_conless_channel(conn, psm, skb); | |
3950 | break; | |
3951 | ||
9f69bda6 GP |
3952 | case L2CAP_CID_LE_DATA: |
3953 | l2cap_att_channel(conn, cid, skb); | |
3954 | break; | |
3955 | ||
b501d6a1 AB |
3956 | case L2CAP_CID_SMP: |
3957 | if (smp_sig_channel(conn, skb)) | |
3958 | l2cap_conn_del(conn->hcon, EACCES); | |
3959 | break; | |
3960 | ||
1da177e4 LT |
3961 | default: |
3962 | l2cap_data_channel(conn, cid, skb); | |
3963 | break; | |
3964 | } | |
3965 | } | |
3966 | ||
3967 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3968 | ||
3969 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3970 | { | |
3971 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 3972 | struct l2cap_chan *c; |
1da177e4 LT |
3973 | |
3974 | if (type != ACL_LINK) | |
963cf687 | 3975 | return -EINVAL; |
1da177e4 LT |
3976 | |
3977 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3978 | ||
3979 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
3980 | read_lock(&chan_list_lock); |
3981 | list_for_each_entry(c, &chan_list, global_l) { | |
3982 | struct sock *sk = c->sk; | |
4343478f | 3983 | |
89bc500e | 3984 | if (c->state != BT_LISTEN) |
1da177e4 LT |
3985 | continue; |
3986 | ||
3987 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 3988 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 3989 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 3990 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 3991 | exact++; |
2af6b9d5 MH |
3992 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3993 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 3994 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
3995 | lm2 |= HCI_LM_MASTER; |
3996 | } | |
1da177e4 | 3997 | } |
23691d75 | 3998 | read_unlock(&chan_list_lock); |
1da177e4 LT |
3999 | |
4000 | return exact ? lm1 : lm2; | |
4001 | } | |
4002 | ||
4003 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4004 | { | |
0139418c MH |
4005 | struct l2cap_conn *conn; |
4006 | ||
1da177e4 LT |
4007 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4008 | ||
acd7d370 | 4009 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4010 | return -EINVAL; |
1da177e4 LT |
4011 | |
4012 | if (!status) { | |
1da177e4 LT |
4013 | conn = l2cap_conn_add(hcon, status); |
4014 | if (conn) | |
4015 | l2cap_conn_ready(conn); | |
0139418c | 4016 | } else |
e175072f | 4017 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4018 | |
4019 | return 0; | |
4020 | } | |
4021 | ||
2950f21a MH |
4022 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4023 | { | |
4024 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4025 | ||
4026 | BT_DBG("hcon %p", hcon); | |
4027 | ||
b5694506 | 4028 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
2950f21a MH |
4029 | return 0x13; |
4030 | ||
4031 | return conn->disc_reason; | |
4032 | } | |
4033 | ||
4034 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4035 | { |
4036 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4037 | ||
acd7d370 | 4038 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4039 | return -EINVAL; |
1da177e4 | 4040 | |
e175072f | 4041 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4042 | |
1da177e4 LT |
4043 | return 0; |
4044 | } | |
4045 | ||
4343478f | 4046 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4047 | { |
715ec005 | 4048 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4049 | return; |
4050 | ||
f62e4323 | 4051 | if (encrypt == 0x00) { |
4343478f | 4052 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 GP |
4053 | __clear_chan_timer(chan); |
4054 | __set_chan_timer(chan, HZ * 5); | |
4343478f | 4055 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4056 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4057 | } else { |
4343478f | 4058 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4059 | __clear_chan_timer(chan); |
f62e4323 MH |
4060 | } |
4061 | } | |
4062 | ||
8c1b2355 | 4063 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4064 | { |
0139418c | 4065 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4066 | struct l2cap_chan *chan; |
1da177e4 | 4067 | |
0139418c | 4068 | if (!conn) |
1da177e4 | 4069 | return 0; |
0139418c | 4070 | |
1da177e4 LT |
4071 | BT_DBG("conn %p", conn); |
4072 | ||
160dc6ac VCG |
4073 | if (hcon->type == LE_LINK) { |
4074 | smp_distribute_keys(conn, 0); | |
4075 | del_timer(&conn->security_timer); | |
4076 | } | |
4077 | ||
baa7e1fa | 4078 | read_lock(&conn->chan_lock); |
1da177e4 | 4079 | |
baa7e1fa | 4080 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4081 | struct sock *sk = chan->sk; |
baa7e1fa | 4082 | |
1da177e4 LT |
4083 | bh_lock_sock(sk); |
4084 | ||
f1cb9af5 VCG |
4085 | BT_DBG("chan->scid %d", chan->scid); |
4086 | ||
4087 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4088 | if (!status && encrypt) { | |
4089 | chan->sec_level = hcon->sec_level; | |
4090 | l2cap_chan_ready(sk); | |
4091 | } | |
4092 | ||
4093 | bh_unlock_sock(sk); | |
4094 | continue; | |
4095 | } | |
4096 | ||
c1360a1c | 4097 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4098 | bh_unlock_sock(sk); |
4099 | continue; | |
4100 | } | |
4101 | ||
89bc500e GP |
4102 | if (!status && (chan->state == BT_CONNECTED || |
4103 | chan->state == BT_CONFIG)) { | |
4343478f | 4104 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4105 | bh_unlock_sock(sk); |
4106 | continue; | |
4107 | } | |
4108 | ||
89bc500e | 4109 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4110 | if (!status) { |
4111 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4112 | req.scid = cpu_to_le16(chan->scid); |
4113 | req.psm = chan->psm; | |
1da177e4 | 4114 | |
fc7f8a7e | 4115 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4116 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4117 | |
fc7f8a7e | 4118 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4119 | L2CAP_CONN_REQ, sizeof(req), &req); |
4120 | } else { | |
c9b66675 GP |
4121 | __clear_chan_timer(chan); |
4122 | __set_chan_timer(chan, HZ / 10); | |
b1235d79 | 4123 | } |
89bc500e | 4124 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4125 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4126 | __u16 res, stat; |
1da177e4 | 4127 | |
b1235d79 | 4128 | if (!status) { |
df3c3931 JH |
4129 | if (bt_sk(sk)->defer_setup) { |
4130 | struct sock *parent = bt_sk(sk)->parent; | |
4131 | res = L2CAP_CR_PEND; | |
4132 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4133 | if (parent) |
4134 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4135 | } else { |
05558911 | 4136 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4137 | res = L2CAP_CR_SUCCESS; |
4138 | stat = L2CAP_CS_NO_INFO; | |
4139 | } | |
b1235d79 | 4140 | } else { |
89bc500e | 4141 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 4142 | __set_chan_timer(chan, HZ / 10); |
df3c3931 JH |
4143 | res = L2CAP_CR_SEC_BLOCK; |
4144 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4145 | } |
4146 | ||
fe4128e0 GP |
4147 | rsp.scid = cpu_to_le16(chan->dcid); |
4148 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4149 | rsp.result = cpu_to_le16(res); |
4150 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4151 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4152 | sizeof(rsp), &rsp); | |
b1235d79 | 4153 | } |
1da177e4 LT |
4154 | |
4155 | bh_unlock_sock(sk); | |
4156 | } | |
4157 | ||
baa7e1fa | 4158 | read_unlock(&conn->chan_lock); |
b1235d79 | 4159 | |
1da177e4 LT |
4160 | return 0; |
4161 | } | |
4162 | ||
4163 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4164 | { | |
4165 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4166 | ||
5a08ecce AE |
4167 | if (!conn) |
4168 | conn = l2cap_conn_add(hcon, 0); | |
4169 | ||
4170 | if (!conn) | |
1da177e4 LT |
4171 | goto drop; |
4172 | ||
4173 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4174 | ||
e702112f | 4175 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4176 | struct l2cap_hdr *hdr; |
48454079 | 4177 | struct l2cap_chan *chan; |
89794813 | 4178 | u16 cid; |
1da177e4 LT |
4179 | int len; |
4180 | ||
4181 | if (conn->rx_len) { | |
4182 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4183 | kfree_skb(conn->rx_skb); | |
4184 | conn->rx_skb = NULL; | |
4185 | conn->rx_len = 0; | |
4186 | l2cap_conn_unreliable(conn, ECOMM); | |
4187 | } | |
4188 | ||
aae7fe22 AE |
4189 | /* Start fragment always begin with Basic L2CAP header */ |
4190 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4191 | BT_ERR("Frame is too short (len %d)", skb->len); |
4192 | l2cap_conn_unreliable(conn, ECOMM); | |
4193 | goto drop; | |
4194 | } | |
4195 | ||
4196 | hdr = (struct l2cap_hdr *) skb->data; | |
4197 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4198 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4199 | |
4200 | if (len == skb->len) { | |
4201 | /* Complete frame received */ | |
4202 | l2cap_recv_frame(conn, skb); | |
4203 | return 0; | |
4204 | } | |
4205 | ||
4206 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4207 | ||
4208 | if (skb->len > len) { | |
4209 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4210 | skb->len, len); | |
4211 | l2cap_conn_unreliable(conn, ECOMM); | |
4212 | goto drop; | |
4213 | } | |
4214 | ||
baa7e1fa | 4215 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4216 | |
48454079 GP |
4217 | if (chan && chan->sk) { |
4218 | struct sock *sk = chan->sk; | |
89794813 | 4219 | |
0c1bc5c6 | 4220 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4221 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4222 | "MTU %d)", len, | |
0c1bc5c6 | 4223 | chan->imtu); |
48454079 GP |
4224 | bh_unlock_sock(sk); |
4225 | l2cap_conn_unreliable(conn, ECOMM); | |
4226 | goto drop; | |
4227 | } | |
89794813 | 4228 | bh_unlock_sock(sk); |
48454079 | 4229 | } |
89794813 | 4230 | |
1da177e4 | 4231 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4232 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4233 | if (!conn->rx_skb) | |
1da177e4 LT |
4234 | goto drop; |
4235 | ||
d626f62b | 4236 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4237 | skb->len); |
1da177e4 LT |
4238 | conn->rx_len = len - skb->len; |
4239 | } else { | |
4240 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4241 | ||
4242 | if (!conn->rx_len) { | |
4243 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4244 | l2cap_conn_unreliable(conn, ECOMM); | |
4245 | goto drop; | |
4246 | } | |
4247 | ||
4248 | if (skb->len > conn->rx_len) { | |
4249 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4250 | skb->len, conn->rx_len); | |
4251 | kfree_skb(conn->rx_skb); | |
4252 | conn->rx_skb = NULL; | |
4253 | conn->rx_len = 0; | |
4254 | l2cap_conn_unreliable(conn, ECOMM); | |
4255 | goto drop; | |
4256 | } | |
4257 | ||
d626f62b | 4258 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4259 | skb->len); |
1da177e4 LT |
4260 | conn->rx_len -= skb->len; |
4261 | ||
4262 | if (!conn->rx_len) { | |
4263 | /* Complete frame received */ | |
4264 | l2cap_recv_frame(conn, conn->rx_skb); | |
4265 | conn->rx_skb = NULL; | |
4266 | } | |
4267 | } | |
4268 | ||
4269 | drop: | |
4270 | kfree_skb(skb); | |
4271 | return 0; | |
4272 | } | |
4273 | ||
aef7d97c | 4274 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4275 | { |
23691d75 | 4276 | struct l2cap_chan *c; |
1da177e4 | 4277 | |
23691d75 | 4278 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4279 | |
23691d75 GP |
4280 | list_for_each_entry(c, &chan_list, global_l) { |
4281 | struct sock *sk = c->sk; | |
101545f6 | 4282 | |
903d343e | 4283 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4284 | batostr(&bt_sk(sk)->src), |
4285 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4286 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4287 | c->scid, c->dcid, c->imtu, c->omtu, |
4288 | c->sec_level, c->mode); | |
05558911 | 4289 | } |
1da177e4 | 4290 | |
23691d75 | 4291 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4292 | |
aef7d97c | 4293 | return 0; |
1da177e4 LT |
4294 | } |
4295 | ||
aef7d97c MH |
4296 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4297 | { | |
4298 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4299 | } | |
4300 | ||
4301 | static const struct file_operations l2cap_debugfs_fops = { | |
4302 | .open = l2cap_debugfs_open, | |
4303 | .read = seq_read, | |
4304 | .llseek = seq_lseek, | |
4305 | .release = single_release, | |
4306 | }; | |
4307 | ||
4308 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4309 | |
1da177e4 LT |
4310 | static struct hci_proto l2cap_hci_proto = { |
4311 | .name = "L2CAP", | |
4312 | .id = HCI_PROTO_L2CAP, | |
4313 | .connect_ind = l2cap_connect_ind, | |
4314 | .connect_cfm = l2cap_connect_cfm, | |
4315 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4316 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4317 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4318 | .recv_acldata = l2cap_recv_acldata |
4319 | }; | |
4320 | ||
64274518 | 4321 | int __init l2cap_init(void) |
1da177e4 LT |
4322 | { |
4323 | int err; | |
be9d1227 | 4324 | |
bb58f747 | 4325 | err = l2cap_init_sockets(); |
1da177e4 LT |
4326 | if (err < 0) |
4327 | return err; | |
4328 | ||
1da177e4 LT |
4329 | err = hci_register_proto(&l2cap_hci_proto); |
4330 | if (err < 0) { | |
4331 | BT_ERR("L2CAP protocol registration failed"); | |
4332 | bt_sock_unregister(BTPROTO_L2CAP); | |
4333 | goto error; | |
4334 | } | |
4335 | ||
aef7d97c MH |
4336 | if (bt_debugfs) { |
4337 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4338 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4339 | if (!l2cap_debugfs) | |
4340 | BT_ERR("Failed to create L2CAP debug file"); | |
4341 | } | |
1da177e4 | 4342 | |
1da177e4 LT |
4343 | return 0; |
4344 | ||
4345 | error: | |
bb58f747 | 4346 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4347 | return err; |
4348 | } | |
4349 | ||
64274518 | 4350 | void l2cap_exit(void) |
1da177e4 | 4351 | { |
aef7d97c | 4352 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4353 | |
1da177e4 LT |
4354 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4355 | BT_ERR("L2CAP protocol unregistration failed"); | |
4356 | ||
bb58f747 | 4357 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4358 | } |
4359 | ||
d1c4a17d GP |
4360 | module_param(disable_ertm, bool, 0644); |
4361 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); | |
a5fd6f30 AE |
4362 | |
4363 | module_param(enable_hs, bool, 0644); | |
4364 | MODULE_PARM_DESC(enable_hs, "Enable High Speed"); |