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Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 57 | #include <net/bluetooth/smp.h> |
1da177e4 | 58 | |
bb58f747 | 59 | int disable_ertm; |
f0709e03 | 60 | |
47ec1dcd | 61 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 62 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 63 | |
b5ad8b7f JB |
64 | static LIST_HEAD(chan_list); |
65 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 66 | |
1da177e4 LT |
67 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
68 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
69 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
70 | void *data); | |
710f9b0a | 71 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
72 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
73 | struct l2cap_chan *chan, int err); | |
1da177e4 | 74 | |
218bb9df GP |
75 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
76 | ||
0139418c | 77 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
78 | |
79 | static inline void chan_hold(struct l2cap_chan *c) | |
80 | { | |
81 | atomic_inc(&c->refcnt); | |
82 | } | |
83 | ||
84 | static inline void chan_put(struct l2cap_chan *c) | |
85 | { | |
86 | if (atomic_dec_and_test(&c->refcnt)) | |
87 | kfree(c); | |
88 | } | |
89 | ||
baa7e1fa | 90 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 91 | { |
48454079 | 92 | struct l2cap_chan *c; |
baa7e1fa GP |
93 | |
94 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 95 | if (c->dcid == cid) |
baa7e1fa | 96 | return c; |
0139418c | 97 | } |
baa7e1fa GP |
98 | return NULL; |
99 | ||
0139418c MH |
100 | } |
101 | ||
baa7e1fa | 102 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 103 | { |
48454079 | 104 | struct l2cap_chan *c; |
baa7e1fa GP |
105 | |
106 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 107 | if (c->scid == cid) |
baa7e1fa | 108 | return c; |
0139418c | 109 | } |
baa7e1fa | 110 | return NULL; |
0139418c MH |
111 | } |
112 | ||
113 | /* Find channel with given SCID. | |
114 | * Returns locked socket */ | |
baa7e1fa | 115 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 116 | { |
48454079 | 117 | struct l2cap_chan *c; |
baa7e1fa GP |
118 | |
119 | read_lock(&conn->chan_lock); | |
120 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
121 | if (c) |
122 | bh_lock_sock(c->sk); | |
baa7e1fa | 123 | read_unlock(&conn->chan_lock); |
48454079 | 124 | return c; |
0139418c MH |
125 | } |
126 | ||
baa7e1fa | 127 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 128 | { |
48454079 | 129 | struct l2cap_chan *c; |
baa7e1fa GP |
130 | |
131 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 132 | if (c->ident == ident) |
baa7e1fa | 133 | return c; |
0139418c | 134 | } |
baa7e1fa | 135 | return NULL; |
0139418c MH |
136 | } |
137 | ||
baa7e1fa | 138 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 139 | { |
48454079 | 140 | struct l2cap_chan *c; |
baa7e1fa GP |
141 | |
142 | read_lock(&conn->chan_lock); | |
143 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
144 | if (c) |
145 | bh_lock_sock(c->sk); | |
baa7e1fa | 146 | read_unlock(&conn->chan_lock); |
48454079 | 147 | return c; |
0139418c MH |
148 | } |
149 | ||
23691d75 | 150 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 151 | { |
23691d75 | 152 | struct l2cap_chan *c; |
9e4425ff | 153 | |
23691d75 GP |
154 | list_for_each_entry(c, &chan_list, global_l) { |
155 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
9e4425ff GP |
156 | goto found; |
157 | } | |
158 | ||
23691d75 | 159 | c = NULL; |
9e4425ff | 160 | found: |
23691d75 | 161 | return c; |
9e4425ff GP |
162 | } |
163 | ||
164 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
165 | { | |
73b2ec18 GP |
166 | int err; |
167 | ||
23691d75 | 168 | write_lock_bh(&chan_list_lock); |
9e4425ff | 169 | |
23691d75 | 170 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
171 | err = -EADDRINUSE; |
172 | goto done; | |
9e4425ff GP |
173 | } |
174 | ||
73b2ec18 GP |
175 | if (psm) { |
176 | chan->psm = psm; | |
177 | chan->sport = psm; | |
178 | err = 0; | |
179 | } else { | |
180 | u16 p; | |
181 | ||
182 | err = -EINVAL; | |
183 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 184 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
185 | chan->psm = cpu_to_le16(p); |
186 | chan->sport = cpu_to_le16(p); | |
187 | err = 0; | |
188 | break; | |
189 | } | |
190 | } | |
9e4425ff | 191 | |
73b2ec18 | 192 | done: |
23691d75 | 193 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 194 | return err; |
9e4425ff GP |
195 | } |
196 | ||
197 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
198 | { | |
23691d75 | 199 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
200 | |
201 | chan->scid = scid; | |
202 | ||
23691d75 | 203 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
204 | |
205 | return 0; | |
206 | } | |
207 | ||
baa7e1fa | 208 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 209 | { |
8db4dc46 | 210 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 211 | |
8db4dc46 | 212 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 213 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
214 | return cid; |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
c9b66675 | 220 | static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout) |
ab07801d | 221 | { |
774e5651 | 222 | BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout); |
89bc500e | 223 | |
942ecc9c | 224 | if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout))) |
774e5651 | 225 | chan_hold(chan); |
ab07801d GP |
226 | } |
227 | ||
c9b66675 | 228 | static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer) |
ab07801d | 229 | { |
774e5651 | 230 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 231 | |
774e5651 MM |
232 | if (timer_pending(timer) && del_timer(timer)) |
233 | chan_put(chan); | |
ab07801d GP |
234 | } |
235 | ||
89bc500e GP |
236 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
237 | { | |
238 | chan->state = state; | |
239 | chan->ops->state_change(chan->data, state); | |
240 | } | |
241 | ||
ab07801d GP |
242 | static void l2cap_chan_timeout(unsigned long arg) |
243 | { | |
244 | struct l2cap_chan *chan = (struct l2cap_chan *) arg; | |
245 | struct sock *sk = chan->sk; | |
246 | int reason; | |
247 | ||
89bc500e | 248 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d GP |
249 | |
250 | bh_lock_sock(sk); | |
251 | ||
252 | if (sock_owned_by_user(sk)) { | |
253 | /* sk is owned by user. Try again later */ | |
c9b66675 | 254 | __set_chan_timer(chan, HZ / 5); |
ab07801d | 255 | bh_unlock_sock(sk); |
71ba0e56 | 256 | chan_put(chan); |
ab07801d GP |
257 | return; |
258 | } | |
259 | ||
89bc500e | 260 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 261 | reason = ECONNREFUSED; |
89bc500e | 262 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
263 | chan->sec_level != BT_SECURITY_SDP) |
264 | reason = ECONNREFUSED; | |
265 | else | |
266 | reason = ETIMEDOUT; | |
267 | ||
0f852724 | 268 | l2cap_chan_close(chan, reason); |
ab07801d GP |
269 | |
270 | bh_unlock_sock(sk); | |
271 | ||
ba3bd0ee | 272 | chan->ops->close(chan->data); |
71ba0e56 | 273 | chan_put(chan); |
ab07801d GP |
274 | } |
275 | ||
23691d75 | 276 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
277 | { |
278 | struct l2cap_chan *chan; | |
279 | ||
280 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
281 | if (!chan) | |
282 | return NULL; | |
283 | ||
284 | chan->sk = sk; | |
285 | ||
23691d75 GP |
286 | write_lock_bh(&chan_list_lock); |
287 | list_add(&chan->global_l, &chan_list); | |
288 | write_unlock_bh(&chan_list_lock); | |
289 | ||
ab07801d GP |
290 | setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); |
291 | ||
89bc500e GP |
292 | chan->state = BT_OPEN; |
293 | ||
71ba0e56 GP |
294 | atomic_set(&chan->refcnt, 1); |
295 | ||
48454079 GP |
296 | return chan; |
297 | } | |
298 | ||
23691d75 | 299 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 300 | { |
23691d75 GP |
301 | write_lock_bh(&chan_list_lock); |
302 | list_del(&chan->global_l); | |
303 | write_unlock_bh(&chan_list_lock); | |
304 | ||
71ba0e56 | 305 | chan_put(chan); |
6ff5abbf GP |
306 | } |
307 | ||
48454079 | 308 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 309 | { |
af05b30b | 310 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 311 | chan->psm, chan->dcid); |
0139418c | 312 | |
2950f21a MH |
313 | conn->disc_reason = 0x13; |
314 | ||
8c1d787b | 315 | chan->conn = conn; |
0139418c | 316 | |
715ec005 | 317 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
318 | if (conn->hcon->type == LE_LINK) { |
319 | /* LE connection */ | |
0c1bc5c6 | 320 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
321 | chan->scid = L2CAP_CID_LE_DATA; |
322 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
323 | } else { |
324 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 325 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 326 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 327 | } |
715ec005 | 328 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 329 | /* Connectionless socket */ |
fe4128e0 GP |
330 | chan->scid = L2CAP_CID_CONN_LESS; |
331 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 332 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
333 | } else { |
334 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
335 | chan->scid = L2CAP_CID_SIGNALING; |
336 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 337 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
338 | } |
339 | ||
71ba0e56 | 340 | chan_hold(chan); |
baa7e1fa GP |
341 | |
342 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
343 | } |
344 | ||
8e87d142 | 345 | /* Delete channel. |
0139418c | 346 | * Must be called on the locked socket. */ |
4519de9a | 347 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 348 | { |
48454079 | 349 | struct sock *sk = chan->sk; |
8c1d787b | 350 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
351 | struct sock *parent = bt_sk(sk)->parent; |
352 | ||
c9b66675 | 353 | __clear_chan_timer(chan); |
0139418c | 354 | |
49208c9c | 355 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 356 | |
8e87d142 | 357 | if (conn) { |
baa7e1fa GP |
358 | /* Delete from channel list */ |
359 | write_lock_bh(&conn->chan_lock); | |
360 | list_del(&chan->list); | |
361 | write_unlock_bh(&conn->chan_lock); | |
71ba0e56 | 362 | chan_put(chan); |
baa7e1fa | 363 | |
8c1d787b | 364 | chan->conn = NULL; |
0139418c MH |
365 | hci_conn_put(conn->hcon); |
366 | } | |
367 | ||
89bc500e | 368 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
369 | sock_set_flag(sk, SOCK_ZAPPED); |
370 | ||
371 | if (err) | |
372 | sk->sk_err = err; | |
373 | ||
374 | if (parent) { | |
375 | bt_accept_unlink(sk); | |
376 | parent->sk_data_ready(parent, 0); | |
377 | } else | |
378 | sk->sk_state_change(sk); | |
c13ffa62 | 379 | |
c1360a1c GP |
380 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
381 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 382 | return; |
2ead70b8 | 383 | |
58d35f87 | 384 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 385 | |
0c1bc5c6 | 386 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
387 | struct srej_list *l, *tmp; |
388 | ||
1a09bcb9 GP |
389 | __clear_retrans_timer(chan); |
390 | __clear_monitor_timer(chan); | |
391 | __clear_ack_timer(chan); | |
c13ffa62 | 392 | |
f1c6775b | 393 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 394 | |
39d5a3ee | 395 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
396 | list_del(&l->list); |
397 | kfree(l); | |
398 | } | |
399 | } | |
0139418c MH |
400 | } |
401 | ||
4519de9a GP |
402 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
403 | { | |
404 | struct sock *sk; | |
405 | ||
406 | BT_DBG("parent %p", parent); | |
407 | ||
408 | /* Close not yet accepted channels */ | |
0f852724 | 409 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 410 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 411 | __clear_chan_timer(chan); |
0f852724 | 412 | lock_sock(sk); |
ba3bd0ee | 413 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 414 | release_sock(sk); |
ba3bd0ee | 415 | chan->ops->close(chan->data); |
0f852724 | 416 | } |
4519de9a GP |
417 | } |
418 | ||
0f852724 | 419 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
420 | { |
421 | struct l2cap_conn *conn = chan->conn; | |
422 | struct sock *sk = chan->sk; | |
423 | ||
89bc500e | 424 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 425 | |
89bc500e | 426 | switch (chan->state) { |
4519de9a GP |
427 | case BT_LISTEN: |
428 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
429 | |
430 | l2cap_state_change(chan, BT_CLOSED); | |
431 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
432 | break; |
433 | ||
434 | case BT_CONNECTED: | |
435 | case BT_CONFIG: | |
715ec005 | 436 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 437 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
438 | __clear_chan_timer(chan); |
439 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
440 | l2cap_send_disconn_req(conn, chan, reason); |
441 | } else | |
442 | l2cap_chan_del(chan, reason); | |
443 | break; | |
444 | ||
445 | case BT_CONNECT2: | |
715ec005 | 446 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
447 | conn->hcon->type == ACL_LINK) { |
448 | struct l2cap_conn_rsp rsp; | |
449 | __u16 result; | |
450 | ||
451 | if (bt_sk(sk)->defer_setup) | |
452 | result = L2CAP_CR_SEC_BLOCK; | |
453 | else | |
454 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 455 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
456 | |
457 | rsp.scid = cpu_to_le16(chan->dcid); | |
458 | rsp.dcid = cpu_to_le16(chan->scid); | |
459 | rsp.result = cpu_to_le16(result); | |
460 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
461 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
462 | sizeof(rsp), &rsp); | |
463 | } | |
464 | ||
465 | l2cap_chan_del(chan, reason); | |
466 | break; | |
467 | ||
468 | case BT_CONNECT: | |
469 | case BT_DISCONN: | |
470 | l2cap_chan_del(chan, reason); | |
471 | break; | |
472 | ||
473 | default: | |
474 | sock_set_flag(sk, SOCK_ZAPPED); | |
475 | break; | |
476 | } | |
477 | } | |
478 | ||
4343478f | 479 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 480 | { |
715ec005 | 481 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 482 | switch (chan->sec_level) { |
8556edd3 JH |
483 | case BT_SECURITY_HIGH: |
484 | return HCI_AT_DEDICATED_BONDING_MITM; | |
485 | case BT_SECURITY_MEDIUM: | |
486 | return HCI_AT_DEDICATED_BONDING; | |
487 | default: | |
488 | return HCI_AT_NO_BONDING; | |
489 | } | |
fe4128e0 | 490 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
491 | if (chan->sec_level == BT_SECURITY_LOW) |
492 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 493 | |
4343478f | 494 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 495 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 496 | else |
8556edd3 | 497 | return HCI_AT_NO_BONDING; |
00ae4af9 | 498 | } else { |
4343478f | 499 | switch (chan->sec_level) { |
00ae4af9 | 500 | case BT_SECURITY_HIGH: |
8556edd3 | 501 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 502 | case BT_SECURITY_MEDIUM: |
8556edd3 | 503 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 504 | default: |
8556edd3 | 505 | return HCI_AT_NO_BONDING; |
00ae4af9 | 506 | } |
0684e5f9 | 507 | } |
8556edd3 JH |
508 | } |
509 | ||
510 | /* Service level security */ | |
4343478f | 511 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 512 | { |
8c1d787b | 513 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
514 | __u8 auth_type; |
515 | ||
4343478f | 516 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 517 | |
4343478f | 518 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
519 | } |
520 | ||
b5ad8b7f | 521 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
522 | { |
523 | u8 id; | |
524 | ||
525 | /* Get next available identificator. | |
526 | * 1 - 128 are used by kernel. | |
527 | * 129 - 199 are reserved. | |
528 | * 200 - 254 are used by utilities like l2ping, etc. | |
529 | */ | |
530 | ||
531 | spin_lock_bh(&conn->lock); | |
532 | ||
533 | if (++conn->tx_ident > 128) | |
534 | conn->tx_ident = 1; | |
535 | ||
536 | id = conn->tx_ident; | |
537 | ||
538 | spin_unlock_bh(&conn->lock); | |
539 | ||
540 | return id; | |
541 | } | |
542 | ||
4519de9a | 543 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
544 | { |
545 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 546 | u8 flags; |
4e8402a3 MH |
547 | |
548 | BT_DBG("code 0x%2.2x", code); | |
549 | ||
550 | if (!skb) | |
9a9c6a34 | 551 | return; |
4e8402a3 | 552 | |
e702112f AE |
553 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
554 | flags = ACL_START_NO_FLUSH; | |
555 | else | |
556 | flags = ACL_START; | |
557 | ||
14b12d0b JG |
558 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
559 | ||
e702112f | 560 | hci_send_acl(conn->hcon, skb, flags); |
4e8402a3 MH |
561 | } |
562 | ||
525cd185 | 563 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
564 | { |
565 | struct sk_buff *skb; | |
566 | struct l2cap_hdr *lh; | |
8c1d787b | 567 | struct l2cap_conn *conn = chan->conn; |
fcc203c3 | 568 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 569 | u8 flags; |
fcc203c3 | 570 | |
89bc500e | 571 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
572 | return; |
573 | ||
47d1ec61 | 574 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 | 575 | hlen += 2; |
1c2acffb | 576 | |
49208c9c | 577 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 578 | |
fcc203c3 | 579 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
580 | control |= L2CAP_CTRL_FRAME_TYPE; |
581 | ||
e2ab4353 | 582 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
9e917af1 | 583 | control |= L2CAP_CTRL_FINAL; |
9e917af1 | 584 | |
e2ab4353 | 585 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
f0946ccf | 586 | control |= L2CAP_CTRL_POLL; |
f0946ccf | 587 | |
1c2acffb GP |
588 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
589 | if (!skb) | |
9a9c6a34 | 590 | return; |
1c2acffb GP |
591 | |
592 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 593 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 594 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
595 | put_unaligned_le16(control, skb_put(skb, 2)); |
596 | ||
47d1ec61 | 597 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
598 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
599 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
600 | } | |
601 | ||
e702112f AE |
602 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
603 | flags = ACL_START_NO_FLUSH; | |
604 | else | |
605 | flags = ACL_START; | |
606 | ||
14b12d0b JG |
607 | bt_cb(skb)->force_active = chan->force_active; |
608 | ||
8c1d787b | 609 | hci_send_acl(chan->conn->hcon, skb, flags); |
1c2acffb GP |
610 | } |
611 | ||
525cd185 | 612 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 613 | { |
e2ab4353 | 614 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
7e743090 | 615 | control |= L2CAP_SUPER_RCV_NOT_READY; |
e2ab4353 | 616 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 617 | } else |
7e743090 GP |
618 | control |= L2CAP_SUPER_RCV_READY; |
619 | ||
42e5c802 | 620 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
2ab25cdd | 621 | |
525cd185 | 622 | l2cap_send_sframe(chan, control); |
7e743090 GP |
623 | } |
624 | ||
b4450035 | 625 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 626 | { |
c1360a1c | 627 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
628 | } |
629 | ||
fc7f8a7e | 630 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 631 | { |
8c1d787b | 632 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
633 | |
634 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
635 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
636 | return; | |
637 | ||
4343478f GP |
638 | if (l2cap_check_security(chan) && |
639 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 | 640 | struct l2cap_conn_req req; |
fe4128e0 GP |
641 | req.scid = cpu_to_le16(chan->scid); |
642 | req.psm = chan->psm; | |
79d554a6 | 643 | |
fc7f8a7e | 644 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 645 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 646 | |
fc7f8a7e GP |
647 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
648 | sizeof(req), &req); | |
b1235d79 | 649 | } |
79d554a6 MH |
650 | } else { |
651 | struct l2cap_info_req req; | |
652 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
653 | ||
654 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
655 | conn->info_ident = l2cap_get_ident(conn); | |
656 | ||
657 | mod_timer(&conn->info_timer, jiffies + | |
658 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
659 | ||
660 | l2cap_send_cmd(conn, conn->info_ident, | |
661 | L2CAP_INFO_REQ, sizeof(req), &req); | |
662 | } | |
663 | } | |
664 | ||
cf6c2c0b GP |
665 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
666 | { | |
667 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 668 | if (!disable_ertm) |
cf6c2c0b GP |
669 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
670 | ||
671 | switch (mode) { | |
672 | case L2CAP_MODE_ERTM: | |
673 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
674 | case L2CAP_MODE_STREAMING: | |
675 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
676 | default: | |
677 | return 0x00; | |
678 | } | |
679 | } | |
680 | ||
4519de9a | 681 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 682 | { |
e92c8e70 | 683 | struct sock *sk; |
22121fc9 GP |
684 | struct l2cap_disconn_req req; |
685 | ||
c13ffa62 GP |
686 | if (!conn) |
687 | return; | |
688 | ||
e92c8e70 GP |
689 | sk = chan->sk; |
690 | ||
0c1bc5c6 | 691 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
692 | __clear_retrans_timer(chan); |
693 | __clear_monitor_timer(chan); | |
694 | __clear_ack_timer(chan); | |
c13ffa62 GP |
695 | } |
696 | ||
fe4128e0 GP |
697 | req.dcid = cpu_to_le16(chan->dcid); |
698 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
699 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
700 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 701 | |
89bc500e | 702 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 703 | sk->sk_err = err; |
22121fc9 GP |
704 | } |
705 | ||
1da177e4 | 706 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
707 | static void l2cap_conn_start(struct l2cap_conn *conn) |
708 | { | |
820ffdb3 | 709 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
710 | |
711 | BT_DBG("conn %p", conn); | |
712 | ||
baa7e1fa | 713 | read_lock(&conn->chan_lock); |
4e8402a3 | 714 | |
820ffdb3 | 715 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 716 | struct sock *sk = chan->sk; |
baa7e1fa | 717 | |
4e8402a3 MH |
718 | bh_lock_sock(sk); |
719 | ||
715ec005 | 720 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
721 | bh_unlock_sock(sk); |
722 | continue; | |
723 | } | |
724 | ||
89bc500e | 725 | if (chan->state == BT_CONNECT) { |
47731de7 | 726 | struct l2cap_conn_req req; |
79d554a6 | 727 | |
4343478f | 728 | if (!l2cap_check_security(chan) || |
b4450035 | 729 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
730 | bh_unlock_sock(sk); |
731 | continue; | |
732 | } | |
79d554a6 | 733 | |
c1360a1c GP |
734 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
735 | && test_bit(CONF_STATE2_DEVICE, | |
736 | &chan->conf_state)) { | |
0f852724 | 737 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 738 | * so release the lock */ |
2461daac | 739 | read_unlock(&conn->chan_lock); |
89bc500e | 740 | l2cap_chan_close(chan, ECONNRESET); |
2461daac | 741 | read_lock(&conn->chan_lock); |
47731de7 GP |
742 | bh_unlock_sock(sk); |
743 | continue; | |
b1235d79 | 744 | } |
47731de7 | 745 | |
fe4128e0 GP |
746 | req.scid = cpu_to_le16(chan->scid); |
747 | req.psm = chan->psm; | |
47731de7 | 748 | |
fc7f8a7e | 749 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 750 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 751 | |
fc7f8a7e GP |
752 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
753 | sizeof(req), &req); | |
47731de7 | 754 | |
89bc500e | 755 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 756 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 757 | char buf[128]; |
fe4128e0 GP |
758 | rsp.scid = cpu_to_le16(chan->dcid); |
759 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 760 | |
4343478f | 761 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
762 | if (bt_sk(sk)->defer_setup) { |
763 | struct sock *parent = bt_sk(sk)->parent; | |
764 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
765 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
766 | if (parent) |
767 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
768 | |
769 | } else { | |
89bc500e | 770 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
771 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
772 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
773 | } | |
79d554a6 MH |
774 | } else { |
775 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
776 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
777 | } | |
778 | ||
fc7f8a7e GP |
779 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
780 | sizeof(rsp), &rsp); | |
e9aeb2dd | 781 | |
c1360a1c | 782 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
783 | rsp.result != L2CAP_CR_SUCCESS) { |
784 | bh_unlock_sock(sk); | |
785 | continue; | |
786 | } | |
787 | ||
c1360a1c | 788 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 789 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
790 | l2cap_build_conf_req(chan, buf), buf); |
791 | chan->num_conf_req++; | |
4e8402a3 MH |
792 | } |
793 | ||
794 | bh_unlock_sock(sk); | |
795 | } | |
796 | ||
baa7e1fa | 797 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
798 | } |
799 | ||
b62f328b VT |
800 | /* Find socket with cid and source bdaddr. |
801 | * Returns closest match, locked. | |
802 | */ | |
23691d75 | 803 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 804 | { |
23691d75 | 805 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 806 | |
23691d75 | 807 | read_lock(&chan_list_lock); |
b62f328b | 808 | |
23691d75 GP |
809 | list_for_each_entry(c, &chan_list, global_l) { |
810 | struct sock *sk = c->sk; | |
fe4128e0 | 811 | |
89bc500e | 812 | if (state && c->state != state) |
b62f328b VT |
813 | continue; |
814 | ||
23691d75 | 815 | if (c->scid == cid) { |
b62f328b | 816 | /* Exact match. */ |
23691d75 GP |
817 | if (!bacmp(&bt_sk(sk)->src, src)) { |
818 | read_unlock(&chan_list_lock); | |
819 | return c; | |
820 | } | |
b62f328b VT |
821 | |
822 | /* Closest match */ | |
823 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 824 | c1 = c; |
b62f328b VT |
825 | } |
826 | } | |
280f294f | 827 | |
23691d75 | 828 | read_unlock(&chan_list_lock); |
b62f328b | 829 | |
23691d75 | 830 | return c1; |
b62f328b VT |
831 | } |
832 | ||
833 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
834 | { | |
c916fbe4 | 835 | struct sock *parent, *sk; |
23691d75 | 836 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
837 | |
838 | BT_DBG(""); | |
839 | ||
840 | /* Check if we have socket listening on cid */ | |
23691d75 | 841 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 842 | conn->src); |
23691d75 | 843 | if (!pchan) |
b62f328b VT |
844 | return; |
845 | ||
23691d75 GP |
846 | parent = pchan->sk; |
847 | ||
62f3a2cf GP |
848 | bh_lock_sock(parent); |
849 | ||
b62f328b VT |
850 | /* Check for backlog size */ |
851 | if (sk_acceptq_is_full(parent)) { | |
852 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
853 | goto clean; | |
854 | } | |
855 | ||
80808e43 GP |
856 | chan = pchan->ops->new_connection(pchan->data); |
857 | if (!chan) | |
b62f328b VT |
858 | goto clean; |
859 | ||
80808e43 | 860 | sk = chan->sk; |
5d41ce1d | 861 | |
baa7e1fa | 862 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
863 | |
864 | hci_conn_hold(conn->hcon); | |
865 | ||
b62f328b VT |
866 | bacpy(&bt_sk(sk)->src, conn->src); |
867 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
868 | ||
d1010240 GP |
869 | bt_accept_enqueue(parent, sk); |
870 | ||
48454079 GP |
871 | __l2cap_chan_add(conn, chan); |
872 | ||
c9b66675 | 873 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 874 | |
89bc500e | 875 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
876 | parent->sk_data_ready(parent, 0); |
877 | ||
baa7e1fa | 878 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
879 | |
880 | clean: | |
881 | bh_unlock_sock(parent); | |
882 | } | |
883 | ||
f1cb9af5 VCG |
884 | static void l2cap_chan_ready(struct sock *sk) |
885 | { | |
886 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
887 | struct sock *parent = bt_sk(sk)->parent; | |
888 | ||
889 | BT_DBG("sk %p, parent %p", sk, parent); | |
890 | ||
891 | chan->conf_state = 0; | |
892 | __clear_chan_timer(chan); | |
893 | ||
43f3dc41 | 894 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
895 | sk->sk_state_change(sk); |
896 | ||
897 | if (parent) | |
898 | parent->sk_data_ready(parent, 0); | |
899 | } | |
900 | ||
4e8402a3 MH |
901 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
902 | { | |
48454079 | 903 | struct l2cap_chan *chan; |
4e8402a3 | 904 | |
79d554a6 | 905 | BT_DBG("conn %p", conn); |
4e8402a3 | 906 | |
b62f328b VT |
907 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
908 | l2cap_le_conn_ready(conn); | |
909 | ||
160dc6ac VCG |
910 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
911 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
912 | ||
baa7e1fa | 913 | read_lock(&conn->chan_lock); |
4e8402a3 | 914 | |
baa7e1fa | 915 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 916 | struct sock *sk = chan->sk; |
baa7e1fa | 917 | |
79d554a6 | 918 | bh_lock_sock(sk); |
4e8402a3 | 919 | |
63128451 | 920 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 921 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 922 | l2cap_chan_ready(sk); |
acd7d370 | 923 | |
63128451 | 924 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 925 | __clear_chan_timer(chan); |
89bc500e | 926 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 927 | sk->sk_state_change(sk); |
b501d6a1 | 928 | |
89bc500e | 929 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 930 | l2cap_do_start(chan); |
4e8402a3 | 931 | |
79d554a6 | 932 | bh_unlock_sock(sk); |
4e8402a3 | 933 | } |
79d554a6 | 934 | |
baa7e1fa | 935 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
936 | } |
937 | ||
938 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
939 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
940 | { | |
48454079 | 941 | struct l2cap_chan *chan; |
4e8402a3 MH |
942 | |
943 | BT_DBG("conn %p", conn); | |
944 | ||
baa7e1fa | 945 | read_lock(&conn->chan_lock); |
4e8402a3 | 946 | |
baa7e1fa | 947 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 948 | struct sock *sk = chan->sk; |
baa7e1fa | 949 | |
4343478f | 950 | if (chan->force_reliable) |
4e8402a3 MH |
951 | sk->sk_err = err; |
952 | } | |
953 | ||
baa7e1fa | 954 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
955 | } |
956 | ||
957 | static void l2cap_info_timeout(unsigned long arg) | |
958 | { | |
959 | struct l2cap_conn *conn = (void *) arg; | |
960 | ||
984947dc | 961 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 962 | conn->info_ident = 0; |
984947dc | 963 | |
4e8402a3 MH |
964 | l2cap_conn_start(conn); |
965 | } | |
966 | ||
5d3de7df VCG |
967 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
968 | { | |
969 | struct l2cap_conn *conn = hcon->l2cap_data; | |
970 | struct l2cap_chan *chan, *l; | |
971 | struct sock *sk; | |
972 | ||
973 | if (!conn) | |
974 | return; | |
975 | ||
976 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
977 | ||
978 | kfree_skb(conn->rx_skb); | |
979 | ||
980 | /* Kill channels */ | |
981 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
982 | sk = chan->sk; | |
983 | bh_lock_sock(sk); | |
984 | l2cap_chan_del(chan, err); | |
985 | bh_unlock_sock(sk); | |
986 | chan->ops->close(chan->data); | |
987 | } | |
988 | ||
989 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) | |
990 | del_timer_sync(&conn->info_timer); | |
991 | ||
d26a2345 | 992 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
5d3de7df | 993 | del_timer(&conn->security_timer); |
8aab4757 | 994 | smp_chan_destroy(conn); |
d26a2345 | 995 | } |
5d3de7df VCG |
996 | |
997 | hcon->l2cap_data = NULL; | |
998 | kfree(conn); | |
999 | } | |
1000 | ||
1001 | static void security_timeout(unsigned long arg) | |
1002 | { | |
1003 | struct l2cap_conn *conn = (void *) arg; | |
1004 | ||
1005 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1006 | } | |
1007 | ||
1da177e4 LT |
1008 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1009 | { | |
0139418c | 1010 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 1011 | |
0139418c | 1012 | if (conn || status) |
1da177e4 LT |
1013 | return conn; |
1014 | ||
0139418c MH |
1015 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
1016 | if (!conn) | |
1da177e4 | 1017 | return NULL; |
1da177e4 LT |
1018 | |
1019 | hcon->l2cap_data = conn; | |
1020 | conn->hcon = hcon; | |
1021 | ||
0139418c MH |
1022 | BT_DBG("hcon %p conn %p", hcon, conn); |
1023 | ||
acd7d370 VT |
1024 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1025 | conn->mtu = hcon->hdev->le_mtu; | |
1026 | else | |
1027 | conn->mtu = hcon->hdev->acl_mtu; | |
1028 | ||
1da177e4 LT |
1029 | conn->src = &hcon->hdev->bdaddr; |
1030 | conn->dst = &hcon->dst; | |
1031 | ||
4e8402a3 MH |
1032 | conn->feat_mask = 0; |
1033 | ||
1da177e4 | 1034 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1035 | rwlock_init(&conn->chan_lock); |
1036 | ||
1037 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1038 | |
5d3de7df VCG |
1039 | if (hcon->type == LE_LINK) |
1040 | setup_timer(&conn->security_timer, security_timeout, | |
1041 | (unsigned long) conn); | |
1042 | else | |
b62f328b | 1043 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
45054dc1 DY |
1044 | (unsigned long) conn); |
1045 | ||
2950f21a MH |
1046 | conn->disc_reason = 0x13; |
1047 | ||
1da177e4 LT |
1048 | return conn; |
1049 | } | |
1050 | ||
48454079 | 1051 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1052 | { |
baa7e1fa | 1053 | write_lock_bh(&conn->chan_lock); |
48454079 | 1054 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1055 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1056 | } |
1057 | ||
1da177e4 | 1058 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1059 | |
1060 | /* Find socket with psm and source bdaddr. | |
1061 | * Returns closest match. | |
1062 | */ | |
23691d75 | 1063 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1064 | { |
23691d75 | 1065 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1066 | |
23691d75 | 1067 | read_lock(&chan_list_lock); |
e0f0cb56 | 1068 | |
23691d75 GP |
1069 | list_for_each_entry(c, &chan_list, global_l) { |
1070 | struct sock *sk = c->sk; | |
fe4128e0 | 1071 | |
89bc500e | 1072 | if (state && c->state != state) |
1da177e4 LT |
1073 | continue; |
1074 | ||
23691d75 | 1075 | if (c->psm == psm) { |
1da177e4 | 1076 | /* Exact match. */ |
23691d75 | 1077 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1078 | read_unlock(&chan_list_lock); |
23691d75 GP |
1079 | return c; |
1080 | } | |
1da177e4 LT |
1081 | |
1082 | /* Closest match */ | |
1083 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1084 | c1 = c; |
1da177e4 LT |
1085 | } |
1086 | } | |
1da177e4 | 1087 | |
23691d75 | 1088 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1089 | |
23691d75 | 1090 | return c1; |
1da177e4 LT |
1091 | } |
1092 | ||
77a74c7e | 1093 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1094 | { |
5d41ce1d | 1095 | struct sock *sk = chan->sk; |
1da177e4 LT |
1096 | bdaddr_t *src = &bt_sk(sk)->src; |
1097 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1098 | struct l2cap_conn *conn; | |
1099 | struct hci_conn *hcon; | |
1100 | struct hci_dev *hdev; | |
09ab6f4c | 1101 | __u8 auth_type; |
44d0e48e | 1102 | int err; |
1da177e4 | 1103 | |
f29972de | 1104 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1105 | chan->psm); |
1da177e4 | 1106 | |
af05b30b GP |
1107 | hdev = hci_get_route(dst, src); |
1108 | if (!hdev) | |
1da177e4 LT |
1109 | return -EHOSTUNREACH; |
1110 | ||
1111 | hci_dev_lock_bh(hdev); | |
1112 | ||
4343478f | 1113 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1114 | |
fe4128e0 | 1115 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1116 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1117 | chan->sec_level, auth_type); |
acd7d370 VT |
1118 | else |
1119 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1120 | chan->sec_level, auth_type); |
acd7d370 | 1121 | |
30e76272 VT |
1122 | if (IS_ERR(hcon)) { |
1123 | err = PTR_ERR(hcon); | |
1da177e4 | 1124 | goto done; |
30e76272 | 1125 | } |
1da177e4 LT |
1126 | |
1127 | conn = l2cap_conn_add(hcon, 0); | |
1128 | if (!conn) { | |
1129 | hci_conn_put(hcon); | |
30e76272 | 1130 | err = -ENOMEM; |
1da177e4 LT |
1131 | goto done; |
1132 | } | |
1133 | ||
1da177e4 LT |
1134 | /* Update source addr of the socket */ |
1135 | bacpy(src, conn->src); | |
1136 | ||
48454079 GP |
1137 | l2cap_chan_add(conn, chan); |
1138 | ||
89bc500e | 1139 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1140 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1141 | |
1142 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1143 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1144 | __clear_chan_timer(chan); |
4343478f | 1145 | if (l2cap_check_security(chan)) |
89bc500e | 1146 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1147 | } else |
fc7f8a7e | 1148 | l2cap_do_start(chan); |
1da177e4 LT |
1149 | } |
1150 | ||
30e76272 VT |
1151 | err = 0; |
1152 | ||
1da177e4 LT |
1153 | done: |
1154 | hci_dev_unlock_bh(hdev); | |
1155 | hci_dev_put(hdev); | |
1156 | return err; | |
1157 | } | |
1158 | ||
dcba0dba | 1159 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1160 | { |
8c1d787b | 1161 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1162 | DECLARE_WAITQUEUE(wait, current); |
1163 | int err = 0; | |
1164 | int timeo = HZ/5; | |
1165 | ||
2b0b05dd | 1166 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1167 | set_current_state(TASK_INTERRUPTIBLE); |
1168 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1169 | if (!timeo) |
1170 | timeo = HZ/5; | |
1171 | ||
1172 | if (signal_pending(current)) { | |
1173 | err = sock_intr_errno(timeo); | |
1174 | break; | |
1175 | } | |
1176 | ||
1177 | release_sock(sk); | |
1178 | timeo = schedule_timeout(timeo); | |
1179 | lock_sock(sk); | |
a71a0cf4 | 1180 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1181 | |
1182 | err = sock_error(sk); | |
1183 | if (err) | |
1184 | break; | |
1185 | } | |
1186 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1187 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1188 | return err; |
1189 | } | |
1190 | ||
e90bac06 GP |
1191 | static void l2cap_monitor_timeout(unsigned long arg) |
1192 | { | |
525cd185 GP |
1193 | struct l2cap_chan *chan = (void *) arg; |
1194 | struct sock *sk = chan->sk; | |
e90bac06 | 1195 | |
525cd185 | 1196 | BT_DBG("chan %p", chan); |
0e98958d | 1197 | |
e686219a | 1198 | bh_lock_sock(sk); |
2c03a7a4 | 1199 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1200 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1201 | bh_unlock_sock(sk); |
e90bac06 GP |
1202 | return; |
1203 | } | |
1204 | ||
6a026610 | 1205 | chan->retry_count++; |
1a09bcb9 | 1206 | __set_monitor_timer(chan); |
e90bac06 | 1207 | |
525cd185 | 1208 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1209 | bh_unlock_sock(sk); |
e90bac06 GP |
1210 | } |
1211 | ||
1212 | static void l2cap_retrans_timeout(unsigned long arg) | |
1213 | { | |
525cd185 GP |
1214 | struct l2cap_chan *chan = (void *) arg; |
1215 | struct sock *sk = chan->sk; | |
e90bac06 | 1216 | |
49208c9c | 1217 | BT_DBG("chan %p", chan); |
0e98958d | 1218 | |
e686219a | 1219 | bh_lock_sock(sk); |
6a026610 | 1220 | chan->retry_count = 1; |
1a09bcb9 | 1221 | __set_monitor_timer(chan); |
e90bac06 | 1222 | |
e2ab4353 | 1223 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1224 | |
525cd185 | 1225 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1226 | bh_unlock_sock(sk); |
e90bac06 GP |
1227 | } |
1228 | ||
42e5c802 | 1229 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1230 | { |
1c2acffb | 1231 | struct sk_buff *skb; |
1da177e4 | 1232 | |
58d35f87 | 1233 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1234 | chan->unacked_frames) { |
42e5c802 | 1235 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1236 | break; |
1da177e4 | 1237 | |
58d35f87 | 1238 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1239 | kfree_skb(skb); |
1da177e4 | 1240 | |
6a026610 | 1241 | chan->unacked_frames--; |
1c2acffb | 1242 | } |
1da177e4 | 1243 | |
6a026610 | 1244 | if (!chan->unacked_frames) |
1a09bcb9 | 1245 | __clear_retrans_timer(chan); |
1c2acffb | 1246 | } |
1da177e4 | 1247 | |
67c9e840 | 1248 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1249 | { |
8c1d787b | 1250 | struct hci_conn *hcon = chan->conn->hcon; |
e702112f | 1251 | u16 flags; |
1c2acffb | 1252 | |
4343478f | 1253 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1254 | |
4343478f | 1255 | if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) |
e702112f AE |
1256 | flags = ACL_START_NO_FLUSH; |
1257 | else | |
1258 | flags = ACL_START; | |
1259 | ||
14b12d0b | 1260 | bt_cb(skb)->force_active = chan->force_active; |
e702112f | 1261 | hci_send_acl(hcon, skb, flags); |
1c2acffb GP |
1262 | } |
1263 | ||
67c9e840 | 1264 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1265 | { |
ccbb84af | 1266 | struct sk_buff *skb; |
fcc203c3 | 1267 | u16 control, fcs; |
6840ed07 | 1268 | |
58d35f87 | 1269 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1270 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1271 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1272 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1273 | |
47d1ec61 | 1274 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1275 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1276 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1277 | } |
1278 | ||
4343478f | 1279 | l2cap_do_send(chan, skb); |
6840ed07 | 1280 | |
42e5c802 | 1281 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1282 | } |
6840ed07 GP |
1283 | } |
1284 | ||
525cd185 | 1285 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1286 | { |
8f17154f GP |
1287 | struct sk_buff *skb, *tx_skb; |
1288 | u16 control, fcs; | |
8f17154f | 1289 | |
58d35f87 | 1290 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1291 | if (!skb) |
1292 | return; | |
8f17154f | 1293 | |
f11d676d GP |
1294 | do { |
1295 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1296 | break; |
8f17154f | 1297 | |
58d35f87 | 1298 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1299 | return; |
8f17154f | 1300 | |
58d35f87 | 1301 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1302 | |
2c03a7a4 GP |
1303 | if (chan->remote_max_tx && |
1304 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1305 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1306 | return; |
1307 | } | |
1308 | ||
1309 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1310 | bt_cb(skb)->retries++; | |
1311 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1312 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1313 | |
e2ab4353 | 1314 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
3cb123d1 | 1315 | control |= L2CAP_CTRL_FINAL; |
95ffa978 | 1316 | |
42e5c802 | 1317 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1318 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1319 | |
f11d676d GP |
1320 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1321 | ||
47d1ec61 | 1322 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1323 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1324 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1325 | } | |
1326 | ||
4343478f | 1327 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1328 | } |
1329 | ||
67c9e840 | 1330 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1331 | { |
1332 | struct sk_buff *skb, *tx_skb; | |
fcc203c3 | 1333 | u16 control, fcs; |
9a9c6a34 | 1334 | int nsent = 0; |
1c2acffb | 1335 | |
89bc500e | 1336 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1337 | return -ENOTCONN; |
e90bac06 | 1338 | |
58d35f87 | 1339 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1340 | |
2c03a7a4 GP |
1341 | if (chan->remote_max_tx && |
1342 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1343 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1344 | break; |
1345 | } | |
1346 | ||
e420aba3 AE |
1347 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1348 | ||
e90bac06 GP |
1349 | bt_cb(skb)->retries++; |
1350 | ||
1c2acffb | 1351 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1352 | control &= L2CAP_CTRL_SAR; |
1353 | ||
e2ab4353 | 1354 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
d5392c8f | 1355 | control |= L2CAP_CTRL_FINAL; |
e2ab4353 | 1356 | |
42e5c802 GP |
1357 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1358 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1359 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1360 | ||
e90bac06 | 1361 | |
47d1ec61 | 1362 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1363 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1364 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1365 | } | |
1366 | ||
4343478f | 1367 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1368 | |
1a09bcb9 | 1369 | __set_retrans_timer(chan); |
1c2acffb | 1370 | |
42e5c802 GP |
1371 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1372 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1373 | |
23e9fde2 | 1374 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1375 | chan->unacked_frames++; |
23e9fde2 | 1376 | |
6a026610 | 1377 | chan->frames_sent++; |
1c2acffb | 1378 | |
58d35f87 GP |
1379 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1380 | chan->tx_send_head = NULL; | |
1c2acffb | 1381 | else |
58d35f87 | 1382 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1383 | |
1384 | nsent++; | |
1c2acffb GP |
1385 | } |
1386 | ||
9e917af1 GP |
1387 | return nsent; |
1388 | } | |
1389 | ||
525cd185 | 1390 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1391 | { |
dfc909be GP |
1392 | int ret; |
1393 | ||
58d35f87 GP |
1394 | if (!skb_queue_empty(&chan->tx_q)) |
1395 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1396 | |
42e5c802 | 1397 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1398 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1399 | return ret; |
1400 | } | |
1401 | ||
525cd185 | 1402 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1403 | { |
9e917af1 GP |
1404 | u16 control = 0; |
1405 | ||
42e5c802 | 1406 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1407 | |
e2ab4353 | 1408 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
9e917af1 | 1409 | control |= L2CAP_SUPER_RCV_NOT_READY; |
e2ab4353 | 1410 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1411 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1412 | return; |
9e917af1 | 1413 | } |
dfc909be | 1414 | |
525cd185 | 1415 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1416 | return; |
1417 | ||
1418 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1419 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1420 | } |
1421 | ||
525cd185 | 1422 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1423 | { |
1424 | struct srej_list *tail; | |
1425 | u16 control; | |
1426 | ||
1427 | control = L2CAP_SUPER_SELECT_REJECT; | |
1428 | control |= L2CAP_CTRL_FINAL; | |
1429 | ||
39d5a3ee | 1430 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1431 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1432 | ||
525cd185 | 1433 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1434 | } |
1435 | ||
1c2acffb GP |
1436 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1437 | { | |
8c1d787b | 1438 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1439 | struct sk_buff **frag; |
1440 | int err, sent = 0; | |
1da177e4 | 1441 | |
59203a21 | 1442 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1443 | return -EFAULT; |
1da177e4 LT |
1444 | |
1445 | sent += count; | |
1446 | len -= count; | |
1447 | ||
1448 | /* Continuation fragments (no L2CAP header) */ | |
1449 | frag = &skb_shinfo(skb)->frag_list; | |
1450 | while (len) { | |
1451 | count = min_t(unsigned int, conn->mtu, len); | |
1452 | ||
1453 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1454 | if (!*frag) | |
0175d629 | 1455 | return err; |
1c2acffb GP |
1456 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1457 | return -EFAULT; | |
1da177e4 LT |
1458 | |
1459 | sent += count; | |
1460 | len -= count; | |
1461 | ||
1462 | frag = &(*frag)->next; | |
1463 | } | |
1da177e4 LT |
1464 | |
1465 | return sent; | |
1c2acffb | 1466 | } |
1da177e4 | 1467 | |
67c9e840 | 1468 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1469 | { |
fe4128e0 | 1470 | struct sock *sk = chan->sk; |
8c1d787b | 1471 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1472 | struct sk_buff *skb; |
1473 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1474 | struct l2cap_hdr *lh; | |
1475 | ||
1476 | BT_DBG("sk %p len %d", sk, (int)len); | |
1477 | ||
1478 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1479 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1480 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1481 | if (!skb) | |
0175d629 | 1482 | return ERR_PTR(err); |
1c2acffb GP |
1483 | |
1484 | /* Create L2CAP header */ | |
1485 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1486 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1487 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1488 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1489 | |
1490 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1491 | if (unlikely(err < 0)) { | |
1492 | kfree_skb(skb); | |
1493 | return ERR_PTR(err); | |
1494 | } | |
1495 | return skb; | |
1496 | } | |
1497 | ||
67c9e840 | 1498 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1499 | { |
fe4128e0 | 1500 | struct sock *sk = chan->sk; |
8c1d787b | 1501 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1502 | struct sk_buff *skb; |
1503 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1504 | struct l2cap_hdr *lh; | |
1505 | ||
1506 | BT_DBG("sk %p len %d", sk, (int)len); | |
1507 | ||
1508 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1509 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1510 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1511 | if (!skb) | |
0175d629 | 1512 | return ERR_PTR(err); |
1c2acffb GP |
1513 | |
1514 | /* Create L2CAP header */ | |
1515 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1516 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1517 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1518 | ||
1519 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1520 | if (unlikely(err < 0)) { | |
1521 | kfree_skb(skb); | |
1522 | return ERR_PTR(err); | |
1523 | } | |
1524 | return skb; | |
1525 | } | |
1526 | ||
ab0ff76d LAD |
1527 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1528 | struct msghdr *msg, size_t len, | |
1529 | u16 control, u16 sdulen) | |
1c2acffb | 1530 | { |
47d1ec61 | 1531 | struct sock *sk = chan->sk; |
8c1d787b | 1532 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1533 | struct sk_buff *skb; |
1534 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1535 | struct l2cap_hdr *lh; | |
1536 | ||
1537 | BT_DBG("sk %p len %d", sk, (int)len); | |
1538 | ||
0ee0d208 GP |
1539 | if (!conn) |
1540 | return ERR_PTR(-ENOTCONN); | |
1541 | ||
c74e560c GP |
1542 | if (sdulen) |
1543 | hlen += 2; | |
1544 | ||
47d1ec61 | 1545 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1546 | hlen += 2; |
1547 | ||
1c2acffb GP |
1548 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1549 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1550 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1551 | if (!skb) | |
0175d629 | 1552 | return ERR_PTR(err); |
1c2acffb GP |
1553 | |
1554 | /* Create L2CAP header */ | |
1555 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1556 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1557 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1558 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1559 | if (sdulen) |
1560 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1561 | |
1562 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1563 | if (unlikely(err < 0)) { | |
1564 | kfree_skb(skb); | |
1565 | return ERR_PTR(err); | |
1566 | } | |
e90bac06 | 1567 | |
47d1ec61 | 1568 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1569 | put_unaligned_le16(0, skb_put(skb, 2)); |
1570 | ||
e90bac06 | 1571 | bt_cb(skb)->retries = 0; |
1c2acffb | 1572 | return skb; |
1da177e4 LT |
1573 | } |
1574 | ||
67c9e840 | 1575 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1576 | { |
c74e560c GP |
1577 | struct sk_buff *skb; |
1578 | struct sk_buff_head sar_queue; | |
1579 | u16 control; | |
1580 | size_t size = 0; | |
1581 | ||
ff12fd64 | 1582 | skb_queue_head_init(&sar_queue); |
c74e560c | 1583 | control = L2CAP_SDU_START; |
47d1ec61 | 1584 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1585 | if (IS_ERR(skb)) |
1586 | return PTR_ERR(skb); | |
1587 | ||
1588 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1589 | len -= chan->remote_mps; |
1590 | size += chan->remote_mps; | |
c74e560c GP |
1591 | |
1592 | while (len > 0) { | |
1593 | size_t buflen; | |
1594 | ||
2c03a7a4 | 1595 | if (len > chan->remote_mps) { |
44651b85 | 1596 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1597 | buflen = chan->remote_mps; |
c74e560c | 1598 | } else { |
44651b85 | 1599 | control = L2CAP_SDU_END; |
c74e560c GP |
1600 | buflen = len; |
1601 | } | |
1602 | ||
47d1ec61 | 1603 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1604 | if (IS_ERR(skb)) { |
1605 | skb_queue_purge(&sar_queue); | |
1606 | return PTR_ERR(skb); | |
1607 | } | |
1608 | ||
1609 | __skb_queue_tail(&sar_queue, skb); | |
1610 | len -= buflen; | |
1611 | size += buflen; | |
c74e560c | 1612 | } |
58d35f87 GP |
1613 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1614 | if (chan->tx_send_head == NULL) | |
1615 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1616 | |
1617 | return size; | |
1618 | } | |
1619 | ||
9a91a04a GP |
1620 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1621 | { | |
9a91a04a GP |
1622 | struct sk_buff *skb; |
1623 | u16 control; | |
1624 | int err; | |
1625 | ||
1626 | /* Connectionless channel */ | |
715ec005 | 1627 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
9a91a04a GP |
1628 | skb = l2cap_create_connless_pdu(chan, msg, len); |
1629 | if (IS_ERR(skb)) | |
1630 | return PTR_ERR(skb); | |
1631 | ||
1632 | l2cap_do_send(chan, skb); | |
1633 | return len; | |
1634 | } | |
1635 | ||
1636 | switch (chan->mode) { | |
1637 | case L2CAP_MODE_BASIC: | |
1638 | /* Check outgoing MTU */ | |
1639 | if (len > chan->omtu) | |
1640 | return -EMSGSIZE; | |
1641 | ||
1642 | /* Create a basic PDU */ | |
1643 | skb = l2cap_create_basic_pdu(chan, msg, len); | |
1644 | if (IS_ERR(skb)) | |
1645 | return PTR_ERR(skb); | |
1646 | ||
1647 | l2cap_do_send(chan, skb); | |
1648 | err = len; | |
1649 | break; | |
1650 | ||
1651 | case L2CAP_MODE_ERTM: | |
1652 | case L2CAP_MODE_STREAMING: | |
1653 | /* Entire SDU fits into one PDU */ | |
1654 | if (len <= chan->remote_mps) { | |
1655 | control = L2CAP_SDU_UNSEGMENTED; | |
1656 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, | |
1657 | 0); | |
1658 | if (IS_ERR(skb)) | |
1659 | return PTR_ERR(skb); | |
1660 | ||
1661 | __skb_queue_tail(&chan->tx_q, skb); | |
1662 | ||
1663 | if (chan->tx_send_head == NULL) | |
1664 | chan->tx_send_head = skb; | |
1665 | ||
1666 | } else { | |
1667 | /* Segment SDU into multiples PDUs */ | |
1668 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1669 | if (err < 0) | |
1670 | return err; | |
1671 | } | |
1672 | ||
1673 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1674 | l2cap_streaming_send(chan); | |
1675 | err = len; | |
1676 | break; | |
1677 | } | |
1678 | ||
e2ab4353 GP |
1679 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1680 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1681 | err = len; |
1682 | break; | |
1683 | } | |
1684 | ||
1685 | err = l2cap_ertm_send(chan); | |
1686 | if (err >= 0) | |
1687 | err = len; | |
1688 | ||
1689 | break; | |
1690 | ||
1691 | default: | |
1692 | BT_DBG("bad state %1.1x", chan->mode); | |
1693 | err = -EBADFD; | |
1694 | } | |
1695 | ||
1696 | return err; | |
1697 | } | |
1698 | ||
1da177e4 LT |
1699 | /* Copy frame to all raw sockets on that connection */ |
1700 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1701 | { | |
1da177e4 | 1702 | struct sk_buff *nskb; |
48454079 | 1703 | struct l2cap_chan *chan; |
1da177e4 LT |
1704 | |
1705 | BT_DBG("conn %p", conn); | |
1706 | ||
baa7e1fa GP |
1707 | read_lock(&conn->chan_lock); |
1708 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1709 | struct sock *sk = chan->sk; |
715ec005 | 1710 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1711 | continue; |
1712 | ||
1713 | /* Don't send frame to the socket it came from */ | |
1714 | if (skb->sk == sk) | |
1715 | continue; | |
af05b30b GP |
1716 | nskb = skb_clone(skb, GFP_ATOMIC); |
1717 | if (!nskb) | |
1da177e4 LT |
1718 | continue; |
1719 | ||
23070494 | 1720 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1721 | kfree_skb(nskb); |
1722 | } | |
baa7e1fa | 1723 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1724 | } |
1725 | ||
1726 | /* ---- L2CAP signalling commands ---- */ | |
1727 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1728 | u8 code, u8 ident, u16 dlen, void *data) | |
1729 | { | |
1730 | struct sk_buff *skb, **frag; | |
1731 | struct l2cap_cmd_hdr *cmd; | |
1732 | struct l2cap_hdr *lh; | |
1733 | int len, count; | |
1734 | ||
af05b30b GP |
1735 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1736 | conn, code, ident, dlen); | |
1da177e4 LT |
1737 | |
1738 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1739 | count = min_t(unsigned int, conn->mtu, len); | |
1740 | ||
1741 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1742 | if (!skb) | |
1743 | return NULL; | |
1744 | ||
1745 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1746 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1747 | |
1748 | if (conn->hcon->type == LE_LINK) | |
1749 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1750 | else | |
1751 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1752 | |
1753 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1754 | cmd->code = code; | |
1755 | cmd->ident = ident; | |
aca3192c | 1756 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1757 | |
1758 | if (dlen) { | |
1759 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1760 | memcpy(skb_put(skb, count), data, count); | |
1761 | data += count; | |
1762 | } | |
1763 | ||
1764 | len -= skb->len; | |
1765 | ||
1766 | /* Continuation fragments (no L2CAP header) */ | |
1767 | frag = &skb_shinfo(skb)->frag_list; | |
1768 | while (len) { | |
1769 | count = min_t(unsigned int, conn->mtu, len); | |
1770 | ||
1771 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1772 | if (!*frag) | |
1773 | goto fail; | |
1774 | ||
1775 | memcpy(skb_put(*frag, count), data, count); | |
1776 | ||
1777 | len -= count; | |
1778 | data += count; | |
1779 | ||
1780 | frag = &(*frag)->next; | |
1781 | } | |
1782 | ||
1783 | return skb; | |
1784 | ||
1785 | fail: | |
1786 | kfree_skb(skb); | |
1787 | return NULL; | |
1788 | } | |
1789 | ||
1790 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1791 | { | |
1792 | struct l2cap_conf_opt *opt = *ptr; | |
1793 | int len; | |
1794 | ||
1795 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1796 | *ptr += len; | |
1797 | ||
1798 | *type = opt->type; | |
1799 | *olen = opt->len; | |
1800 | ||
1801 | switch (opt->len) { | |
1802 | case 1: | |
1803 | *val = *((u8 *) opt->val); | |
1804 | break; | |
1805 | ||
1806 | case 2: | |
bfaaeb3e | 1807 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1808 | break; |
1809 | ||
1810 | case 4: | |
bfaaeb3e | 1811 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1812 | break; |
1813 | ||
1814 | default: | |
1815 | *val = (unsigned long) opt->val; | |
1816 | break; | |
1817 | } | |
1818 | ||
1819 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1820 | return len; | |
1821 | } | |
1822 | ||
1da177e4 LT |
1823 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1824 | { | |
1825 | struct l2cap_conf_opt *opt = *ptr; | |
1826 | ||
1827 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1828 | ||
1829 | opt->type = type; | |
1830 | opt->len = len; | |
1831 | ||
1832 | switch (len) { | |
1833 | case 1: | |
1834 | *((u8 *) opt->val) = val; | |
1835 | break; | |
1836 | ||
1837 | case 2: | |
4f8b691c | 1838 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1839 | break; |
1840 | ||
1841 | case 4: | |
4f8b691c | 1842 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1843 | break; |
1844 | ||
1845 | default: | |
1846 | memcpy(opt->val, (void *) val, len); | |
1847 | break; | |
1848 | } | |
1849 | ||
1850 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1851 | } | |
1852 | ||
c1b4f43b GP |
1853 | static void l2cap_ack_timeout(unsigned long arg) |
1854 | { | |
525cd185 | 1855 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1856 | |
525cd185 GP |
1857 | bh_lock_sock(chan->sk); |
1858 | l2cap_send_ack(chan); | |
1859 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1860 | } |
1861 | ||
525cd185 | 1862 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1863 | { |
525cd185 GP |
1864 | struct sock *sk = chan->sk; |
1865 | ||
42e5c802 | 1866 | chan->expected_ack_seq = 0; |
6a026610 | 1867 | chan->unacked_frames = 0; |
42e5c802 | 1868 | chan->buffer_seq = 0; |
6a026610 GP |
1869 | chan->num_acked = 0; |
1870 | chan->frames_sent = 0; | |
0565c1c2 | 1871 | |
e92c8e70 GP |
1872 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1873 | (unsigned long) chan); | |
1874 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1875 | (unsigned long) chan); | |
1876 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1877 | |
f1c6775b | 1878 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 1879 | |
39d5a3ee GP |
1880 | INIT_LIST_HEAD(&chan->srej_l); |
1881 | ||
218bb9df GP |
1882 | |
1883 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1884 | } |
1885 | ||
f2fcfcd6 GP |
1886 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1887 | { | |
1888 | switch (mode) { | |
1889 | case L2CAP_MODE_STREAMING: | |
1890 | case L2CAP_MODE_ERTM: | |
1891 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1892 | return mode; | |
1893 | /* fall through */ | |
1894 | default: | |
1895 | return L2CAP_MODE_BASIC; | |
1896 | } | |
1897 | } | |
1898 | ||
710f9b0a | 1899 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1900 | { |
1da177e4 | 1901 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1902 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1903 | void *ptr = req->data; |
1904 | ||
49208c9c | 1905 | BT_DBG("chan %p", chan); |
1da177e4 | 1906 | |
73ffa904 | 1907 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1908 | goto done; |
1909 | ||
0c1bc5c6 | 1910 | switch (chan->mode) { |
f2fcfcd6 GP |
1911 | case L2CAP_MODE_STREAMING: |
1912 | case L2CAP_MODE_ERTM: | |
c1360a1c | 1913 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 1914 | break; |
85eb53c6 | 1915 | |
2ba13ed6 | 1916 | /* fall through */ |
f2fcfcd6 | 1917 | default: |
8c1d787b | 1918 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
1919 | break; |
1920 | } | |
1921 | ||
1922 | done: | |
0c1bc5c6 GP |
1923 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1924 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1925 | |
0c1bc5c6 | 1926 | switch (chan->mode) { |
65c7c491 | 1927 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
1928 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1929 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
1930 | break; |
1931 | ||
62547752 GP |
1932 | rfc.mode = L2CAP_MODE_BASIC; |
1933 | rfc.txwin_size = 0; | |
1934 | rfc.max_transmit = 0; | |
1935 | rfc.retrans_timeout = 0; | |
1936 | rfc.monitor_timeout = 0; | |
1937 | rfc.max_pdu_size = 0; | |
1938 | ||
63406504 GP |
1939 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1940 | (unsigned long) &rfc); | |
65c7c491 MH |
1941 | break; |
1942 | ||
1943 | case L2CAP_MODE_ERTM: | |
1944 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 GP |
1945 | rfc.txwin_size = chan->tx_win; |
1946 | rfc.max_transmit = chan->max_tx; | |
f2fcfcd6 GP |
1947 | rfc.retrans_timeout = 0; |
1948 | rfc.monitor_timeout = 0; | |
c74e560c | 1949 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1950 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1951 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
f2fcfcd6 | 1952 | |
63406504 GP |
1953 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1954 | (unsigned long) &rfc); | |
1955 | ||
8c1d787b | 1956 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1957 | break; |
1958 | ||
47d1ec61 | 1959 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 1960 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
1961 | chan->fcs = L2CAP_FCS_NONE; |
1962 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1963 | } |
f2fcfcd6 GP |
1964 | break; |
1965 | ||
1966 | case L2CAP_MODE_STREAMING: | |
1967 | rfc.mode = L2CAP_MODE_STREAMING; | |
1968 | rfc.txwin_size = 0; | |
1969 | rfc.max_transmit = 0; | |
1970 | rfc.retrans_timeout = 0; | |
1971 | rfc.monitor_timeout = 0; | |
c74e560c | 1972 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1973 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1974 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
65c7c491 | 1975 | |
63406504 GP |
1976 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1977 | (unsigned long) &rfc); | |
1978 | ||
8c1d787b | 1979 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1980 | break; |
1981 | ||
47d1ec61 | 1982 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 1983 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
1984 | chan->fcs = L2CAP_FCS_NONE; |
1985 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1986 | } |
65c7c491 MH |
1987 | break; |
1988 | } | |
1da177e4 | 1989 | |
fe4128e0 | 1990 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 1991 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
1992 | |
1993 | return ptr - data; | |
1994 | } | |
1995 | ||
73ffa904 | 1996 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1997 | { |
5dee9e7c MH |
1998 | struct l2cap_conf_rsp *rsp = data; |
1999 | void *ptr = rsp->data; | |
73ffa904 GP |
2000 | void *req = chan->conf_req; |
2001 | int len = chan->conf_len; | |
5dee9e7c MH |
2002 | int type, hint, olen; |
2003 | unsigned long val; | |
6464f35f | 2004 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2005 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2006 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2007 | |
73ffa904 | 2008 | BT_DBG("chan %p", chan); |
820ae1b8 | 2009 | |
5dee9e7c MH |
2010 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2011 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2012 | |
589d2746 | 2013 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2014 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2015 | |
2016 | switch (type) { | |
2017 | case L2CAP_CONF_MTU: | |
861d6882 | 2018 | mtu = val; |
5dee9e7c MH |
2019 | break; |
2020 | ||
2021 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2022 | chan->flush_to = val; |
5dee9e7c MH |
2023 | break; |
2024 | ||
2025 | case L2CAP_CONF_QOS: | |
2026 | break; | |
2027 | ||
6464f35f MH |
2028 | case L2CAP_CONF_RFC: |
2029 | if (olen == sizeof(rfc)) | |
2030 | memcpy(&rfc, (void *) val, olen); | |
2031 | break; | |
2032 | ||
fcc203c3 GP |
2033 | case L2CAP_CONF_FCS: |
2034 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2035 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
fcc203c3 GP |
2036 | |
2037 | break; | |
2038 | ||
5dee9e7c MH |
2039 | default: |
2040 | if (hint) | |
2041 | break; | |
2042 | ||
2043 | result = L2CAP_CONF_UNKNOWN; | |
2044 | *((u8 *) ptr++) = type; | |
2045 | break; | |
2046 | } | |
2047 | } | |
2048 | ||
73ffa904 | 2049 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2050 | goto done; |
2051 | ||
0c1bc5c6 | 2052 | switch (chan->mode) { |
f2fcfcd6 GP |
2053 | case L2CAP_MODE_STREAMING: |
2054 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2055 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2056 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2057 | chan->conn->feat_mask); |
85eb53c6 GP |
2058 | break; |
2059 | } | |
2060 | ||
0c1bc5c6 | 2061 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2062 | return -ECONNREFUSED; |
742e519b | 2063 | |
f2fcfcd6 | 2064 | break; |
f2fcfcd6 GP |
2065 | } |
2066 | ||
2067 | done: | |
0c1bc5c6 | 2068 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2069 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2070 | rfc.mode = chan->mode; |
f2fcfcd6 | 2071 | |
73ffa904 | 2072 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2073 | return -ECONNREFUSED; |
2074 | ||
2075 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2076 | sizeof(rfc), (unsigned long) &rfc); | |
2077 | } | |
2078 | ||
2079 | ||
5dee9e7c MH |
2080 | if (result == L2CAP_CONF_SUCCESS) { |
2081 | /* Configure output options and let the other side know | |
2082 | * which ones we don't like. */ | |
2083 | ||
f2fcfcd6 GP |
2084 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2085 | result = L2CAP_CONF_UNACCEPT; | |
2086 | else { | |
0c1bc5c6 | 2087 | chan->omtu = mtu; |
c1360a1c | 2088 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2089 | } |
0c1bc5c6 | 2090 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2091 | |
f2fcfcd6 GP |
2092 | switch (rfc.mode) { |
2093 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2094 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2095 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2096 | break; |
2097 | ||
2098 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
2099 | chan->remote_tx_win = rfc.txwin_size; |
2100 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 | 2101 | |
8c1d787b GP |
2102 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2103 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2104 | |
2c03a7a4 | 2105 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2106 | |
10467e9e GP |
2107 | rfc.retrans_timeout = |
2108 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2109 | rfc.monitor_timeout = | |
2110 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2111 | |
c1360a1c | 2112 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2113 | |
2114 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2115 | sizeof(rfc), (unsigned long) &rfc); | |
2116 | ||
f2fcfcd6 GP |
2117 | break; |
2118 | ||
2119 | case L2CAP_MODE_STREAMING: | |
8c1d787b GP |
2120 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2121 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2122 | |
2c03a7a4 | 2123 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2124 | |
c1360a1c | 2125 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2126 | |
2127 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2128 | sizeof(rfc), (unsigned long) &rfc); | |
2129 | ||
f2fcfcd6 GP |
2130 | break; |
2131 | ||
2132 | default: | |
5dee9e7c | 2133 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2134 | |
6464f35f | 2135 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2136 | rfc.mode = chan->mode; |
f2fcfcd6 | 2137 | } |
6464f35f | 2138 | |
f2fcfcd6 | 2139 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2140 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2141 | } |
fe4128e0 | 2142 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2143 | rsp->result = cpu_to_le16(result); |
2144 | rsp->flags = cpu_to_le16(0x0000); | |
2145 | ||
2146 | return ptr - data; | |
1da177e4 LT |
2147 | } |
2148 | ||
b4450035 | 2149 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2150 | { |
f2fcfcd6 GP |
2151 | struct l2cap_conf_req *req = data; |
2152 | void *ptr = req->data; | |
2153 | int type, olen; | |
2154 | unsigned long val; | |
2155 | struct l2cap_conf_rfc rfc; | |
2156 | ||
fe4128e0 | 2157 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2158 | |
2159 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2160 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2161 | ||
2162 | switch (type) { | |
2163 | case L2CAP_CONF_MTU: | |
2164 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2165 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2166 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2167 | } else |
0c1bc5c6 GP |
2168 | chan->imtu = val; |
2169 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2170 | break; |
2171 | ||
2172 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2173 | chan->flush_to = val; |
f2fcfcd6 | 2174 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2175 | 2, chan->flush_to); |
f2fcfcd6 GP |
2176 | break; |
2177 | ||
2178 | case L2CAP_CONF_RFC: | |
2179 | if (olen == sizeof(rfc)) | |
2180 | memcpy(&rfc, (void *)val, olen); | |
2181 | ||
c1360a1c | 2182 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2183 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2184 | return -ECONNREFUSED; |
2185 | ||
47d1ec61 | 2186 | chan->fcs = 0; |
f2fcfcd6 GP |
2187 | |
2188 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2189 | sizeof(rfc), (unsigned long) &rfc); | |
2190 | break; | |
2191 | } | |
2192 | } | |
2193 | ||
0c1bc5c6 | 2194 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2195 | return -ECONNREFUSED; |
2196 | ||
0c1bc5c6 | 2197 | chan->mode = rfc.mode; |
6c2ea7a8 | 2198 | |
f2fcfcd6 GP |
2199 | if (*result == L2CAP_CONF_SUCCESS) { |
2200 | switch (rfc.mode) { | |
2201 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2202 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2203 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2204 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2205 | break; |
2206 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2207 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2208 | } |
2209 | } | |
2210 | ||
fe4128e0 | 2211 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2212 | req->flags = cpu_to_le16(0x0000); |
2213 | ||
2214 | return ptr - data; | |
2215 | } | |
2216 | ||
fe4128e0 | 2217 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2218 | { |
2219 | struct l2cap_conf_rsp *rsp = data; | |
2220 | void *ptr = rsp->data; | |
1da177e4 | 2221 | |
fe4128e0 | 2222 | BT_DBG("chan %p", chan); |
1da177e4 | 2223 | |
fe4128e0 | 2224 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2225 | rsp->result = cpu_to_le16(result); |
aca3192c | 2226 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2227 | |
2228 | return ptr - data; | |
2229 | } | |
2230 | ||
8c1d787b | 2231 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2232 | { |
2233 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2234 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2235 | u8 buf[128]; |
2236 | ||
fe4128e0 GP |
2237 | rsp.scid = cpu_to_le16(chan->dcid); |
2238 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2239 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2240 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2241 | l2cap_send_cmd(conn, chan->ident, | |
2242 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2243 | ||
c1360a1c | 2244 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2245 | return; |
2246 | ||
710f9b0a GP |
2247 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2248 | l2cap_build_conf_req(chan, buf), buf); | |
2249 | chan->num_conf_req++; | |
2250 | } | |
2251 | ||
47d1ec61 | 2252 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2253 | { |
7b1c0049 GP |
2254 | int type, olen; |
2255 | unsigned long val; | |
2256 | struct l2cap_conf_rfc rfc; | |
2257 | ||
47d1ec61 | 2258 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2259 | |
0c1bc5c6 | 2260 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2261 | return; |
2262 | ||
2263 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2264 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2265 | ||
2266 | switch (type) { | |
2267 | case L2CAP_CONF_RFC: | |
2268 | if (olen == sizeof(rfc)) | |
2269 | memcpy(&rfc, (void *)val, olen); | |
2270 | goto done; | |
2271 | } | |
2272 | } | |
2273 | ||
2274 | done: | |
2275 | switch (rfc.mode) { | |
2276 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2277 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2278 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2279 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2280 | break; |
2281 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2282 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2283 | } |
2284 | } | |
2285 | ||
4e8402a3 MH |
2286 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2287 | { | |
e2fd318e | 2288 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2289 | |
e2fd318e | 2290 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2291 | return 0; |
2292 | ||
2293 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2294 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2295 | del_timer(&conn->info_timer); |
984947dc MH |
2296 | |
2297 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2298 | conn->info_ident = 0; |
984947dc | 2299 | |
4e8402a3 MH |
2300 | l2cap_conn_start(conn); |
2301 | } | |
2302 | ||
2303 | return 0; | |
2304 | } | |
2305 | ||
1da177e4 LT |
2306 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2307 | { | |
1da177e4 LT |
2308 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2309 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2310 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2311 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2312 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2313 | |
2314 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2315 | __le16 psm = req->psm; |
1da177e4 LT |
2316 | |
2317 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2318 | ||
2319 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2320 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2321 | if (!pchan) { | |
1da177e4 LT |
2322 | result = L2CAP_CR_BAD_PSM; |
2323 | goto sendresp; | |
2324 | } | |
2325 | ||
23691d75 GP |
2326 | parent = pchan->sk; |
2327 | ||
e0f0cb56 GP |
2328 | bh_lock_sock(parent); |
2329 | ||
e7c29cb1 MH |
2330 | /* Check if the ACL is secure enough (if not SDP) */ |
2331 | if (psm != cpu_to_le16(0x0001) && | |
2332 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2333 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2334 | result = L2CAP_CR_SEC_BLOCK; |
2335 | goto response; | |
2336 | } | |
2337 | ||
1da177e4 LT |
2338 | result = L2CAP_CR_NO_MEM; |
2339 | ||
2340 | /* Check for backlog size */ | |
2341 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2342 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2343 | goto response; |
2344 | } | |
2345 | ||
80808e43 GP |
2346 | chan = pchan->ops->new_connection(pchan->data); |
2347 | if (!chan) | |
1da177e4 LT |
2348 | goto response; |
2349 | ||
80808e43 GP |
2350 | sk = chan->sk; |
2351 | ||
baa7e1fa | 2352 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2353 | |
2354 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2355 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2356 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2357 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2358 | chan->ops->close(chan->data); |
1da177e4 LT |
2359 | goto response; |
2360 | } | |
2361 | ||
2362 | hci_conn_hold(conn->hcon); | |
2363 | ||
1da177e4 LT |
2364 | bacpy(&bt_sk(sk)->src, conn->src); |
2365 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2366 | chan->psm = psm; |
2367 | chan->dcid = scid; | |
1da177e4 | 2368 | |
d1010240 GP |
2369 | bt_accept_enqueue(parent, sk); |
2370 | ||
48454079 GP |
2371 | __l2cap_chan_add(conn, chan); |
2372 | ||
fe4128e0 | 2373 | dcid = chan->scid; |
1da177e4 | 2374 | |
c9b66675 | 2375 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2376 | |
fc7f8a7e | 2377 | chan->ident = cmd->ident; |
1da177e4 | 2378 | |
984947dc | 2379 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2380 | if (l2cap_check_security(chan)) { |
f66dc81f | 2381 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2382 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2383 | result = L2CAP_CR_PEND; |
2384 | status = L2CAP_CS_AUTHOR_PEND; | |
2385 | parent->sk_data_ready(parent, 0); | |
2386 | } else { | |
89bc500e | 2387 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2388 | result = L2CAP_CR_SUCCESS; |
2389 | status = L2CAP_CS_NO_INFO; | |
2390 | } | |
79d554a6 | 2391 | } else { |
89bc500e | 2392 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2393 | result = L2CAP_CR_PEND; |
2394 | status = L2CAP_CS_AUTHEN_PEND; | |
2395 | } | |
2396 | } else { | |
89bc500e | 2397 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2398 | result = L2CAP_CR_PEND; |
2399 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2400 | } |
2401 | ||
baa7e1fa | 2402 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2403 | |
2404 | response: | |
2405 | bh_unlock_sock(parent); | |
2406 | ||
2407 | sendresp: | |
aca3192c YH |
2408 | rsp.scid = cpu_to_le16(scid); |
2409 | rsp.dcid = cpu_to_le16(dcid); | |
2410 | rsp.result = cpu_to_le16(result); | |
2411 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2412 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2413 | |
2414 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2415 | struct l2cap_info_req info; | |
2416 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2417 | ||
2418 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2419 | conn->info_ident = l2cap_get_ident(conn); | |
2420 | ||
2421 | mod_timer(&conn->info_timer, jiffies + | |
2422 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2423 | ||
2424 | l2cap_send_cmd(conn, conn->info_ident, | |
2425 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2426 | } | |
2427 | ||
c1360a1c | 2428 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2429 | result == L2CAP_CR_SUCCESS) { |
2430 | u8 buf[128]; | |
c1360a1c | 2431 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2432 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2433 | l2cap_build_conf_req(chan, buf), buf); |
2434 | chan->num_conf_req++; | |
e9aeb2dd GP |
2435 | } |
2436 | ||
1da177e4 LT |
2437 | return 0; |
2438 | } | |
2439 | ||
2440 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2441 | { | |
2442 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2443 | u16 scid, dcid, result, status; | |
48454079 | 2444 | struct l2cap_chan *chan; |
1da177e4 LT |
2445 | struct sock *sk; |
2446 | u8 req[128]; | |
2447 | ||
2448 | scid = __le16_to_cpu(rsp->scid); | |
2449 | dcid = __le16_to_cpu(rsp->dcid); | |
2450 | result = __le16_to_cpu(rsp->result); | |
2451 | status = __le16_to_cpu(rsp->status); | |
2452 | ||
2453 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2454 | ||
2455 | if (scid) { | |
baa7e1fa | 2456 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2457 | if (!chan) |
57d3b22b | 2458 | return -EFAULT; |
1da177e4 | 2459 | } else { |
baa7e1fa | 2460 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2461 | if (!chan) |
57d3b22b | 2462 | return -EFAULT; |
1da177e4 LT |
2463 | } |
2464 | ||
48454079 GP |
2465 | sk = chan->sk; |
2466 | ||
1da177e4 LT |
2467 | switch (result) { |
2468 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2469 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2470 | chan->ident = 0; |
fe4128e0 | 2471 | chan->dcid = dcid; |
c1360a1c | 2472 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2473 | |
c1360a1c | 2474 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2475 | break; |
2476 | ||
1da177e4 | 2477 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2478 | l2cap_build_conf_req(chan, req), req); |
2479 | chan->num_conf_req++; | |
1da177e4 LT |
2480 | break; |
2481 | ||
2482 | case L2CAP_CR_PEND: | |
c1360a1c | 2483 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2484 | break; |
2485 | ||
2486 | default: | |
a49184c2 AE |
2487 | /* don't delete l2cap channel if sk is owned by user */ |
2488 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2489 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2490 | __clear_chan_timer(chan); |
2491 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2492 | break; |
2493 | } | |
2494 | ||
48454079 | 2495 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2496 | break; |
2497 | } | |
2498 | ||
2499 | bh_unlock_sock(sk); | |
2500 | return 0; | |
2501 | } | |
2502 | ||
47d1ec61 | 2503 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2504 | { |
2505 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2506 | * sides request it. | |
2507 | */ | |
0c1bc5c6 | 2508 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2509 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2510 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2511 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2512 | } |
2513 | ||
88219a0f | 2514 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2515 | { |
2516 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2517 | u16 dcid, flags; | |
2518 | u8 rsp[64]; | |
48454079 | 2519 | struct l2cap_chan *chan; |
1da177e4 | 2520 | struct sock *sk; |
5dee9e7c | 2521 | int len; |
1da177e4 LT |
2522 | |
2523 | dcid = __le16_to_cpu(req->dcid); | |
2524 | flags = __le16_to_cpu(req->flags); | |
2525 | ||
2526 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2527 | ||
baa7e1fa | 2528 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2529 | if (!chan) |
1da177e4 LT |
2530 | return -ENOENT; |
2531 | ||
48454079 GP |
2532 | sk = chan->sk; |
2533 | ||
033b1142 | 2534 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2535 | struct l2cap_cmd_rej_cid rej; |
2536 | ||
2537 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2538 | rej.scid = cpu_to_le16(chan->scid); | |
2539 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2540 | |
df6bd743 GP |
2541 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2542 | sizeof(rej), &rej); | |
354f60a9 | 2543 | goto unlock; |
df6bd743 | 2544 | } |
354f60a9 | 2545 | |
5dee9e7c | 2546 | /* Reject if config buffer is too small. */ |
88219a0f | 2547 | len = cmd_len - sizeof(*req); |
7ac28817 | 2548 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2549 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2550 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2551 | L2CAP_CONF_REJECT, flags), rsp); |
2552 | goto unlock; | |
2553 | } | |
2554 | ||
2555 | /* Store config. */ | |
73ffa904 GP |
2556 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2557 | chan->conf_len += len; | |
1da177e4 LT |
2558 | |
2559 | if (flags & 0x0001) { | |
2560 | /* Incomplete config. Send empty response. */ | |
2561 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2562 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2563 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2564 | goto unlock; |
2565 | } | |
2566 | ||
2567 | /* Complete config. */ | |
73ffa904 | 2568 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2569 | if (len < 0) { |
e92c8e70 | 2570 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2571 | goto unlock; |
f2fcfcd6 | 2572 | } |
1da177e4 | 2573 | |
5dee9e7c | 2574 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2575 | chan->num_conf_rsp++; |
5dee9e7c | 2576 | |
5dee9e7c | 2577 | /* Reset config buffer. */ |
73ffa904 | 2578 | chan->conf_len = 0; |
5dee9e7c | 2579 | |
c1360a1c | 2580 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2581 | goto unlock; |
2582 | ||
c1360a1c | 2583 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2584 | set_default_fcs(chan); |
fcc203c3 | 2585 | |
89bc500e | 2586 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2587 | |
42e5c802 GP |
2588 | chan->next_tx_seq = 0; |
2589 | chan->expected_tx_seq = 0; | |
58d35f87 | 2590 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2591 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2592 | l2cap_ertm_init(chan); |
0565c1c2 | 2593 | |
1da177e4 | 2594 | l2cap_chan_ready(sk); |
876d9484 MH |
2595 | goto unlock; |
2596 | } | |
2597 | ||
c1360a1c | 2598 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2599 | u8 buf[64]; |
1da177e4 | 2600 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2601 | l2cap_build_conf_req(chan, buf), buf); |
2602 | chan->num_conf_req++; | |
1da177e4 LT |
2603 | } |
2604 | ||
2605 | unlock: | |
2606 | bh_unlock_sock(sk); | |
2607 | return 0; | |
2608 | } | |
2609 | ||
2610 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2611 | { | |
2612 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2613 | u16 scid, flags, result; | |
48454079 | 2614 | struct l2cap_chan *chan; |
1da177e4 | 2615 | struct sock *sk; |
7b1c0049 | 2616 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2617 | |
2618 | scid = __le16_to_cpu(rsp->scid); | |
2619 | flags = __le16_to_cpu(rsp->flags); | |
2620 | result = __le16_to_cpu(rsp->result); | |
2621 | ||
af05b30b GP |
2622 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2623 | scid, flags, result); | |
1da177e4 | 2624 | |
baa7e1fa | 2625 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2626 | if (!chan) |
1da177e4 LT |
2627 | return 0; |
2628 | ||
48454079 GP |
2629 | sk = chan->sk; |
2630 | ||
1da177e4 LT |
2631 | switch (result) { |
2632 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2633 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2634 | break; |
2635 | ||
2636 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2637 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2638 | char req[64]; |
2639 | ||
c2c77ec8 | 2640 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2641 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2642 | goto done; |
2643 | } | |
2644 | ||
f2fcfcd6 GP |
2645 | /* throw out any old stored conf requests */ |
2646 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2647 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2648 | req, &result); | |
f2fcfcd6 | 2649 | if (len < 0) { |
e92c8e70 | 2650 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2651 | goto done; |
2652 | } | |
2653 | ||
2654 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2655 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2656 | chan->num_conf_req++; |
f2fcfcd6 GP |
2657 | if (result != L2CAP_CONF_SUCCESS) |
2658 | goto done; | |
2659 | break; | |
1da177e4 LT |
2660 | } |
2661 | ||
8e87d142 | 2662 | default: |
b1235d79 | 2663 | sk->sk_err = ECONNRESET; |
c9b66675 | 2664 | __set_chan_timer(chan, HZ * 5); |
e92c8e70 | 2665 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2666 | goto done; |
2667 | } | |
2668 | ||
2669 | if (flags & 0x01) | |
2670 | goto done; | |
2671 | ||
c1360a1c | 2672 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2673 | |
c1360a1c | 2674 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2675 | set_default_fcs(chan); |
fcc203c3 | 2676 | |
89bc500e | 2677 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2678 | chan->next_tx_seq = 0; |
2679 | chan->expected_tx_seq = 0; | |
58d35f87 | 2680 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2681 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2682 | l2cap_ertm_init(chan); |
0565c1c2 | 2683 | |
1da177e4 LT |
2684 | l2cap_chan_ready(sk); |
2685 | } | |
2686 | ||
2687 | done: | |
2688 | bh_unlock_sock(sk); | |
2689 | return 0; | |
2690 | } | |
2691 | ||
2692 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2693 | { | |
2694 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2695 | struct l2cap_disconn_rsp rsp; | |
2696 | u16 dcid, scid; | |
48454079 | 2697 | struct l2cap_chan *chan; |
1da177e4 LT |
2698 | struct sock *sk; |
2699 | ||
2700 | scid = __le16_to_cpu(req->scid); | |
2701 | dcid = __le16_to_cpu(req->dcid); | |
2702 | ||
2703 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2704 | ||
baa7e1fa | 2705 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2706 | if (!chan) |
1da177e4 LT |
2707 | return 0; |
2708 | ||
48454079 GP |
2709 | sk = chan->sk; |
2710 | ||
fe4128e0 GP |
2711 | rsp.dcid = cpu_to_le16(chan->scid); |
2712 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2713 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2714 | ||
2715 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2716 | ||
a49184c2 AE |
2717 | /* don't delete l2cap channel if sk is owned by user */ |
2718 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2719 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2720 | __clear_chan_timer(chan); |
2721 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2722 | bh_unlock_sock(sk); |
2723 | return 0; | |
2724 | } | |
2725 | ||
48454079 | 2726 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2727 | bh_unlock_sock(sk); |
2728 | ||
ba3bd0ee | 2729 | chan->ops->close(chan->data); |
1da177e4 LT |
2730 | return 0; |
2731 | } | |
2732 | ||
2733 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2734 | { | |
2735 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2736 | u16 dcid, scid; | |
48454079 | 2737 | struct l2cap_chan *chan; |
1da177e4 LT |
2738 | struct sock *sk; |
2739 | ||
2740 | scid = __le16_to_cpu(rsp->scid); | |
2741 | dcid = __le16_to_cpu(rsp->dcid); | |
2742 | ||
2743 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2744 | ||
baa7e1fa | 2745 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2746 | if (!chan) |
1da177e4 LT |
2747 | return 0; |
2748 | ||
48454079 GP |
2749 | sk = chan->sk; |
2750 | ||
a49184c2 AE |
2751 | /* don't delete l2cap channel if sk is owned by user */ |
2752 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2753 | l2cap_state_change(chan,BT_DISCONN); |
c9b66675 GP |
2754 | __clear_chan_timer(chan); |
2755 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2756 | bh_unlock_sock(sk); |
2757 | return 0; | |
2758 | } | |
2759 | ||
48454079 | 2760 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2761 | bh_unlock_sock(sk); |
2762 | ||
ba3bd0ee | 2763 | chan->ops->close(chan->data); |
1da177e4 LT |
2764 | return 0; |
2765 | } | |
2766 | ||
2767 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2768 | { | |
2769 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2770 | u16 type; |
2771 | ||
2772 | type = __le16_to_cpu(req->type); | |
2773 | ||
2774 | BT_DBG("type 0x%4.4x", type); | |
2775 | ||
f0709e03 MH |
2776 | if (type == L2CAP_IT_FEAT_MASK) { |
2777 | u8 buf[8]; | |
44dd46de | 2778 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2779 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2780 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2781 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2782 | if (!disable_ertm) |
fcc203c3 GP |
2783 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2784 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2785 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2786 | l2cap_send_cmd(conn, cmd->ident, |
2787 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2788 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2789 | u8 buf[12]; | |
2790 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2791 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2792 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2793 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2794 | l2cap_send_cmd(conn, cmd->ident, | |
2795 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2796 | } else { |
2797 | struct l2cap_info_rsp rsp; | |
2798 | rsp.type = cpu_to_le16(type); | |
2799 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2800 | l2cap_send_cmd(conn, cmd->ident, | |
2801 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2802 | } | |
1da177e4 LT |
2803 | |
2804 | return 0; | |
2805 | } | |
2806 | ||
2807 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2808 | { | |
2809 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2810 | u16 type, result; | |
2811 | ||
2812 | type = __le16_to_cpu(rsp->type); | |
2813 | result = __le16_to_cpu(rsp->result); | |
2814 | ||
2815 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2816 | ||
e90165be AE |
2817 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2818 | if (cmd->ident != conn->info_ident || | |
2819 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2820 | return 0; | |
2821 | ||
4e8402a3 MH |
2822 | del_timer(&conn->info_timer); |
2823 | ||
adb08ede VT |
2824 | if (result != L2CAP_IR_SUCCESS) { |
2825 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2826 | conn->info_ident = 0; | |
2827 | ||
2828 | l2cap_conn_start(conn); | |
2829 | ||
2830 | return 0; | |
2831 | } | |
2832 | ||
984947dc | 2833 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2834 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2835 | |
47ec1dcd | 2836 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2837 | struct l2cap_info_req req; |
2838 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2839 | ||
2840 | conn->info_ident = l2cap_get_ident(conn); | |
2841 | ||
2842 | l2cap_send_cmd(conn, conn->info_ident, | |
2843 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2844 | } else { | |
2845 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2846 | conn->info_ident = 0; | |
2847 | ||
2848 | l2cap_conn_start(conn); | |
2849 | } | |
2850 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2851 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2852 | conn->info_ident = 0; |
984947dc MH |
2853 | |
2854 | l2cap_conn_start(conn); | |
2855 | } | |
4e8402a3 | 2856 | |
1da177e4 LT |
2857 | return 0; |
2858 | } | |
2859 | ||
e2174ca4 | 2860 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2861 | u16 to_multiplier) |
2862 | { | |
2863 | u16 max_latency; | |
2864 | ||
2865 | if (min > max || min < 6 || max > 3200) | |
2866 | return -EINVAL; | |
2867 | ||
2868 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2869 | return -EINVAL; | |
2870 | ||
2871 | if (max >= to_multiplier * 8) | |
2872 | return -EINVAL; | |
2873 | ||
2874 | max_latency = (to_multiplier * 8 / max) - 1; | |
2875 | if (latency > 499 || latency > max_latency) | |
2876 | return -EINVAL; | |
2877 | ||
2878 | return 0; | |
2879 | } | |
2880 | ||
2881 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2882 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2883 | { | |
2884 | struct hci_conn *hcon = conn->hcon; | |
2885 | struct l2cap_conn_param_update_req *req; | |
2886 | struct l2cap_conn_param_update_rsp rsp; | |
2887 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2888 | int err; |
de73115a CT |
2889 | |
2890 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2891 | return -EINVAL; | |
2892 | ||
2893 | cmd_len = __le16_to_cpu(cmd->len); | |
2894 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2895 | return -EPROTO; | |
2896 | ||
2897 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2898 | min = __le16_to_cpu(req->min); |
2899 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2900 | latency = __le16_to_cpu(req->latency); |
2901 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2902 | ||
2903 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2904 | min, max, latency, to_multiplier); | |
2905 | ||
2906 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2907 | |
2908 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2909 | if (err) | |
de73115a CT |
2910 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2911 | else | |
2912 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2913 | ||
2914 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2915 | sizeof(rsp), &rsp); | |
2916 | ||
2ce603eb CT |
2917 | if (!err) |
2918 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2919 | ||
de73115a CT |
2920 | return 0; |
2921 | } | |
2922 | ||
3300d9a9 CT |
2923 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2924 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2925 | { | |
2926 | int err = 0; | |
2927 | ||
2928 | switch (cmd->code) { | |
2929 | case L2CAP_COMMAND_REJ: | |
2930 | l2cap_command_rej(conn, cmd, data); | |
2931 | break; | |
2932 | ||
2933 | case L2CAP_CONN_REQ: | |
2934 | err = l2cap_connect_req(conn, cmd, data); | |
2935 | break; | |
2936 | ||
2937 | case L2CAP_CONN_RSP: | |
2938 | err = l2cap_connect_rsp(conn, cmd, data); | |
2939 | break; | |
2940 | ||
2941 | case L2CAP_CONF_REQ: | |
2942 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2943 | break; | |
2944 | ||
2945 | case L2CAP_CONF_RSP: | |
2946 | err = l2cap_config_rsp(conn, cmd, data); | |
2947 | break; | |
2948 | ||
2949 | case L2CAP_DISCONN_REQ: | |
2950 | err = l2cap_disconnect_req(conn, cmd, data); | |
2951 | break; | |
2952 | ||
2953 | case L2CAP_DISCONN_RSP: | |
2954 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2955 | break; | |
2956 | ||
2957 | case L2CAP_ECHO_REQ: | |
2958 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2959 | break; | |
2960 | ||
2961 | case L2CAP_ECHO_RSP: | |
2962 | break; | |
2963 | ||
2964 | case L2CAP_INFO_REQ: | |
2965 | err = l2cap_information_req(conn, cmd, data); | |
2966 | break; | |
2967 | ||
2968 | case L2CAP_INFO_RSP: | |
2969 | err = l2cap_information_rsp(conn, cmd, data); | |
2970 | break; | |
2971 | ||
2972 | default: | |
2973 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2974 | err = -EINVAL; | |
2975 | break; | |
2976 | } | |
2977 | ||
2978 | return err; | |
2979 | } | |
2980 | ||
2981 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2982 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2983 | { | |
2984 | switch (cmd->code) { | |
2985 | case L2CAP_COMMAND_REJ: | |
2986 | return 0; | |
2987 | ||
2988 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2989 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2990 | |
2991 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2992 | return 0; | |
2993 | ||
2994 | default: | |
2995 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2996 | return -EINVAL; | |
2997 | } | |
2998 | } | |
2999 | ||
3000 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3001 | struct sk_buff *skb) | |
1da177e4 LT |
3002 | { |
3003 | u8 *data = skb->data; | |
3004 | int len = skb->len; | |
3005 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3006 | int err; |
1da177e4 LT |
3007 | |
3008 | l2cap_raw_recv(conn, skb); | |
3009 | ||
3010 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3011 | u16 cmd_len; |
1da177e4 LT |
3012 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3013 | data += L2CAP_CMD_HDR_SIZE; | |
3014 | len -= L2CAP_CMD_HDR_SIZE; | |
3015 | ||
88219a0f | 3016 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3017 | |
88219a0f | 3018 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3019 | |
88219a0f | 3020 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3021 | BT_DBG("corrupted command"); |
3022 | break; | |
3023 | } | |
3024 | ||
3300d9a9 CT |
3025 | if (conn->hcon->type == LE_LINK) |
3026 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3027 | else | |
3028 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3029 | |
3030 | if (err) { | |
e2fd318e | 3031 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3032 | |
3033 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3034 | |
3035 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3036 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3037 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3038 | } | |
3039 | ||
88219a0f AV |
3040 | data += cmd_len; |
3041 | len -= cmd_len; | |
1da177e4 LT |
3042 | } |
3043 | ||
3044 | kfree_skb(skb); | |
3045 | } | |
3046 | ||
47d1ec61 | 3047 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3048 | { |
3049 | u16 our_fcs, rcv_fcs; | |
3050 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3051 | ||
47d1ec61 | 3052 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
3053 | skb_trim(skb, skb->len - 2); |
3054 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3055 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3056 | ||
3057 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3058 | return -EBADMSG; |
fcc203c3 GP |
3059 | } |
3060 | return 0; | |
3061 | } | |
3062 | ||
525cd185 | 3063 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3064 | { |
d5392c8f GP |
3065 | u16 control = 0; |
3066 | ||
6a026610 | 3067 | chan->frames_sent = 0; |
d5392c8f | 3068 | |
42e5c802 | 3069 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 3070 | |
e2ab4353 | 3071 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
64988868 | 3072 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3073 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3074 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3075 | } |
3076 | ||
e2ab4353 | 3077 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3078 | l2cap_retransmit_frames(chan); |
d5392c8f | 3079 | |
525cd185 | 3080 | l2cap_ertm_send(chan); |
d5392c8f | 3081 | |
e2ab4353 | 3082 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3083 | chan->frames_sent == 0) { |
d5392c8f | 3084 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 3085 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3086 | } |
3087 | } | |
3088 | ||
42e5c802 | 3089 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3090 | { |
3091 | struct sk_buff *next_skb; | |
bfbacc11 | 3092 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3093 | |
3094 | bt_cb(skb)->tx_seq = tx_seq; | |
3095 | bt_cb(skb)->sar = sar; | |
3096 | ||
f1c6775b | 3097 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3098 | if (!next_skb) { |
f1c6775b | 3099 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 3100 | return 0; |
8f17154f GP |
3101 | } |
3102 | ||
42e5c802 | 3103 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3104 | if (tx_seq_offset < 0) |
3105 | tx_seq_offset += 64; | |
3106 | ||
8f17154f | 3107 | do { |
9b53350d JPRV |
3108 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3109 | return -EINVAL; | |
3110 | ||
bfbacc11 | 3111 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 3112 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3113 | if (next_tx_seq_offset < 0) |
3114 | next_tx_seq_offset += 64; | |
3115 | ||
3116 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3117 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3118 | return 0; |
8f17154f GP |
3119 | } |
3120 | ||
f1c6775b | 3121 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
3122 | break; |
3123 | ||
f1c6775b | 3124 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 3125 | |
f1c6775b | 3126 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3127 | |
3128 | return 0; | |
8f17154f GP |
3129 | } |
3130 | ||
84084a31 MM |
3131 | static void append_skb_frag(struct sk_buff *skb, |
3132 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3133 | { |
84084a31 MM |
3134 | /* skb->len reflects data in skb as well as all fragments |
3135 | * skb->data_len reflects only data in fragments | |
3136 | */ | |
3137 | if (!skb_has_frag_list(skb)) | |
3138 | skb_shinfo(skb)->frag_list = new_frag; | |
3139 | ||
3140 | new_frag->next = NULL; | |
3141 | ||
3142 | (*last_frag)->next = new_frag; | |
3143 | *last_frag = new_frag; | |
3144 | ||
3145 | skb->len += new_frag->len; | |
3146 | skb->data_len += new_frag->len; | |
3147 | skb->truesize += new_frag->truesize; | |
3148 | } | |
3149 | ||
3150 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) | |
3151 | { | |
3152 | int err = -EINVAL; | |
18778a63 GP |
3153 | |
3154 | switch (control & L2CAP_CTRL_SAR) { | |
3155 | case L2CAP_SDU_UNSEGMENTED: | |
84084a31 MM |
3156 | if (chan->sdu) |
3157 | break; | |
18778a63 | 3158 | |
84084a31 MM |
3159 | err = chan->ops->recv(chan->data, skb); |
3160 | break; | |
18778a63 GP |
3161 | |
3162 | case L2CAP_SDU_START: | |
84084a31 MM |
3163 | if (chan->sdu) |
3164 | break; | |
18778a63 | 3165 | |
6f61fd47 | 3166 | chan->sdu_len = get_unaligned_le16(skb->data); |
84084a31 | 3167 | skb_pull(skb, 2); |
18778a63 | 3168 | |
84084a31 MM |
3169 | if (chan->sdu_len > chan->imtu) { |
3170 | err = -EMSGSIZE; | |
3171 | break; | |
3172 | } | |
1890d36b | 3173 | |
84084a31 MM |
3174 | if (skb->len >= chan->sdu_len) |
3175 | break; | |
18778a63 | 3176 | |
84084a31 MM |
3177 | chan->sdu = skb; |
3178 | chan->sdu_last_frag = skb; | |
18778a63 | 3179 | |
84084a31 MM |
3180 | skb = NULL; |
3181 | err = 0; | |
18778a63 GP |
3182 | break; |
3183 | ||
3184 | case L2CAP_SDU_CONTINUE: | |
6f61fd47 | 3185 | if (!chan->sdu) |
84084a31 | 3186 | break; |
18778a63 | 3187 | |
84084a31 MM |
3188 | append_skb_frag(chan->sdu, skb, |
3189 | &chan->sdu_last_frag); | |
3190 | skb = NULL; | |
18778a63 | 3191 | |
84084a31 MM |
3192 | if (chan->sdu->len >= chan->sdu_len) |
3193 | break; | |
4178ba46 | 3194 | |
84084a31 | 3195 | err = 0; |
18778a63 GP |
3196 | break; |
3197 | ||
3198 | case L2CAP_SDU_END: | |
6f61fd47 | 3199 | if (!chan->sdu) |
84084a31 | 3200 | break; |
18778a63 | 3201 | |
84084a31 MM |
3202 | append_skb_frag(chan->sdu, skb, |
3203 | &chan->sdu_last_frag); | |
3204 | skb = NULL; | |
4178ba46 | 3205 | |
84084a31 MM |
3206 | if (chan->sdu->len != chan->sdu_len) |
3207 | break; | |
18778a63 | 3208 | |
84084a31 | 3209 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3210 | |
84084a31 MM |
3211 | if (!err) { |
3212 | /* Reassembly complete */ | |
3213 | chan->sdu = NULL; | |
3214 | chan->sdu_last_frag = NULL; | |
3215 | chan->sdu_len = 0; | |
1890d36b | 3216 | } |
18778a63 GP |
3217 | break; |
3218 | } | |
3219 | ||
84084a31 MM |
3220 | if (err) { |
3221 | kfree_skb(skb); | |
3222 | kfree_skb(chan->sdu); | |
3223 | chan->sdu = NULL; | |
3224 | chan->sdu_last_frag = NULL; | |
3225 | chan->sdu_len = 0; | |
3226 | } | |
18778a63 | 3227 | |
84084a31 | 3228 | return err; |
18778a63 GP |
3229 | } |
3230 | ||
26f880d2 | 3231 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3232 | { |
712132eb | 3233 | u16 control; |
712132eb | 3234 | |
26f880d2 | 3235 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3236 | |
26f880d2 MM |
3237 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3238 | ||
3239 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3240 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
3241 | l2cap_send_sframe(chan, control); | |
3242 | ||
3243 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3244 | ||
3245 | __clear_ack_timer(chan); | |
3246 | } | |
3247 | ||
3248 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3249 | { | |
3250 | u16 control; | |
712132eb | 3251 | |
e2ab4353 | 3252 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3253 | goto done; |
3254 | ||
42e5c802 | 3255 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 3256 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 3257 | l2cap_send_sframe(chan, control); |
6a026610 | 3258 | chan->retry_count = 1; |
712132eb | 3259 | |
1a09bcb9 GP |
3260 | __clear_retrans_timer(chan); |
3261 | __set_monitor_timer(chan); | |
712132eb | 3262 | |
e2ab4353 | 3263 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3264 | |
3265 | done: | |
e2ab4353 GP |
3266 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3267 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3268 | |
49208c9c | 3269 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3270 | } |
3271 | ||
e328140f | 3272 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3273 | { |
e328140f MM |
3274 | if (chan->mode == L2CAP_MODE_ERTM) { |
3275 | if (busy) | |
3276 | l2cap_ertm_enter_local_busy(chan); | |
3277 | else | |
3278 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3279 | } |
1890d36b GP |
3280 | } |
3281 | ||
525cd185 | 3282 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3283 | { |
3284 | struct sk_buff *skb; | |
afefdbc4 | 3285 | u16 control; |
8f17154f | 3286 | |
e328140f MM |
3287 | while ((skb = skb_peek(&chan->srej_q)) && |
3288 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3289 | int err; | |
3290 | ||
8f17154f GP |
3291 | if (bt_cb(skb)->tx_seq != tx_seq) |
3292 | break; | |
3293 | ||
f1c6775b | 3294 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3295 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
84084a31 | 3296 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3297 | |
3298 | if (err < 0) { | |
3299 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3300 | break; | |
3301 | } | |
3302 | ||
42e5c802 GP |
3303 | chan->buffer_seq_srej = |
3304 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3305 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3306 | } |
3307 | } | |
3308 | ||
525cd185 | 3309 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3310 | { |
8f17154f GP |
3311 | struct srej_list *l, *tmp; |
3312 | u16 control; | |
3313 | ||
39d5a3ee | 3314 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3315 | if (l->tx_seq == tx_seq) { |
3316 | list_del(&l->list); | |
3317 | kfree(l); | |
3318 | return; | |
3319 | } | |
3320 | control = L2CAP_SUPER_SELECT_REJECT; | |
3321 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3322 | l2cap_send_sframe(chan, control); |
8f17154f | 3323 | list_del(&l->list); |
39d5a3ee | 3324 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3325 | } |
3326 | } | |
3327 | ||
525cd185 | 3328 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3329 | { |
8f17154f GP |
3330 | struct srej_list *new; |
3331 | u16 control; | |
3332 | ||
42e5c802 | 3333 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3334 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3335 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3336 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3337 | |
3338 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3339 | new->tx_seq = chan->expected_tx_seq; |
3340 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3341 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3342 | } |
42e5c802 | 3343 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3344 | } |
3345 | ||
525cd185 | 3346 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3347 | { |
1c2acffb | 3348 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3349 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3350 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3351 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3352 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3353 | int err = 0; |
3354 | ||
525cd185 GP |
3355 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3356 | tx_seq, rx_control); | |
1c2acffb | 3357 | |
9b16dc65 | 3358 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3359 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3360 | __clear_monitor_timer(chan); |
6a026610 | 3361 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3362 | __set_retrans_timer(chan); |
e2ab4353 | 3363 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3364 | } |
3365 | ||
42e5c802 GP |
3366 | chan->expected_ack_seq = req_seq; |
3367 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3368 | |
42e5c802 | 3369 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3370 | if (tx_seq_offset < 0) |
3371 | tx_seq_offset += 64; | |
3372 | ||
3373 | /* invalid tx_seq */ | |
47d1ec61 | 3374 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3375 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3376 | goto drop; |
3377 | } | |
3378 | ||
e2ab4353 | 3379 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3380 | goto drop; |
3381 | ||
02f1b641 MM |
3382 | if (tx_seq == chan->expected_tx_seq) |
3383 | goto expected; | |
3384 | ||
e2ab4353 | 3385 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3386 | struct srej_list *first; |
30afb5b2 | 3387 | |
39d5a3ee | 3388 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3389 | struct srej_list, list); |
3390 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3391 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3392 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3393 | |
3394 | list_del(&first->list); | |
3395 | kfree(first); | |
3396 | ||
39d5a3ee | 3397 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3398 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3399 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3400 | l2cap_send_ack(chan); |
49208c9c | 3401 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3402 | } |
3403 | } else { | |
3404 | struct srej_list *l; | |
9b53350d JPRV |
3405 | |
3406 | /* duplicated tx_seq */ | |
42e5c802 | 3407 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3408 | goto drop; |
8f17154f | 3409 | |
39d5a3ee | 3410 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3411 | if (l->tx_seq == tx_seq) { |
525cd185 | 3412 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3413 | return 0; |
3414 | } | |
3415 | } | |
525cd185 | 3416 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3417 | } |
3418 | } else { | |
9b53350d | 3419 | expected_tx_seq_offset = |
42e5c802 | 3420 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3421 | if (expected_tx_seq_offset < 0) |
3422 | expected_tx_seq_offset += 64; | |
3423 | ||
3424 | /* duplicated tx_seq */ | |
3425 | if (tx_seq_offset < expected_tx_seq_offset) | |
3426 | goto drop; | |
3427 | ||
e2ab4353 | 3428 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3429 | |
49208c9c | 3430 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3431 | |
39d5a3ee | 3432 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3433 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3434 | |
f1c6775b | 3435 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3436 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3437 | |
e2ab4353 | 3438 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3439 | |
525cd185 | 3440 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3441 | |
1a09bcb9 | 3442 | __clear_ack_timer(chan); |
1c2acffb | 3443 | } |
30afb5b2 GP |
3444 | return 0; |
3445 | ||
8f17154f | 3446 | expected: |
42e5c802 | 3447 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3448 | |
e2ab4353 | 3449 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3450 | bt_cb(skb)->tx_seq = tx_seq; |
3451 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3452 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3453 | return 0; |
3454 | } | |
3455 | ||
84084a31 | 3456 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
fadd192e | 3457 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
e328140f MM |
3458 | if (err < 0) { |
3459 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3460 | return err; | |
3461 | } | |
2ece3684 | 3462 | |
4ec10d97 | 3463 | if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3464 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3465 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3466 | } |
3467 | ||
1a09bcb9 | 3468 | __set_ack_timer(chan); |
c1b4f43b | 3469 | |
6a026610 GP |
3470 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3471 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3472 | l2cap_send_ack(chan); |
9e917af1 | 3473 | |
8f17154f | 3474 | return 0; |
9b53350d JPRV |
3475 | |
3476 | drop: | |
3477 | kfree_skb(skb); | |
3478 | return 0; | |
1c2acffb GP |
3479 | } |
3480 | ||
525cd185 | 3481 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3482 | { |
49208c9c | 3483 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3484 | rx_control); |
3485 | ||
42e5c802 GP |
3486 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3487 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3488 | |
e072745f | 3489 | if (rx_control & L2CAP_CTRL_POLL) { |
e2ab4353 GP |
3490 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3491 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3492 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3493 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3494 | __set_retrans_timer(chan); |
05fbd89d | 3495 | |
e2ab4353 | 3496 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 3497 | l2cap_send_srejtail(chan); |
05fbd89d | 3498 | } else { |
525cd185 | 3499 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3500 | } |
1d8f5d16 | 3501 | |
e072745f | 3502 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3503 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 3504 | |
e2ab4353 | 3505 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3506 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3507 | |
e072745f | 3508 | } else { |
e2ab4353 | 3509 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 3510 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3511 | __set_retrans_timer(chan); |
1c2acffb | 3512 | |
e2ab4353 GP |
3513 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
3514 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 3515 | l2cap_send_ack(chan); |
894718a6 | 3516 | else |
525cd185 | 3517 | l2cap_ertm_send(chan); |
e072745f GP |
3518 | } |
3519 | } | |
2246b2f1 | 3520 | |
525cd185 | 3521 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3522 | { |
e072745f | 3523 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3524 | |
525cd185 | 3525 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3526 | |
e2ab4353 | 3527 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 3528 | |
42e5c802 GP |
3529 | chan->expected_ack_seq = tx_seq; |
3530 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3531 | |
3532 | if (rx_control & L2CAP_CTRL_FINAL) { | |
e2ab4353 | 3533 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3534 | l2cap_retransmit_frames(chan); |
e072745f | 3535 | } else { |
525cd185 | 3536 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3537 | |
e2ab4353 GP |
3538 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
3539 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
3540 | } |
3541 | } | |
525cd185 | 3542 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3543 | { |
e072745f | 3544 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3545 | |
525cd185 | 3546 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3547 | |
e2ab4353 | 3548 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 3549 | |
e072745f | 3550 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3551 | chan->expected_ack_seq = tx_seq; |
3552 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3553 | |
e2ab4353 | 3554 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 3555 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 3556 | |
525cd185 | 3557 | l2cap_ertm_send(chan); |
dfc909be | 3558 | |
e2ab4353 | 3559 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3560 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3561 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3562 | } |
e072745f | 3563 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3564 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 3565 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 3566 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 3567 | else |
525cd185 | 3568 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3569 | } else { |
525cd185 | 3570 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 3571 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3572 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3573 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3574 | } |
e072745f GP |
3575 | } |
3576 | } | |
3577 | ||
525cd185 | 3578 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3579 | { |
e072745f GP |
3580 | u8 tx_seq = __get_reqseq(rx_control); |
3581 | ||
525cd185 | 3582 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3583 | |
e2ab4353 | 3584 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
3585 | chan->expected_ack_seq = tx_seq; |
3586 | l2cap_drop_acked_frames(chan); | |
e072745f | 3587 | |
3cb123d1 | 3588 | if (rx_control & L2CAP_CTRL_POLL) |
e2ab4353 | 3589 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 3590 | |
e2ab4353 | 3591 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 3592 | __clear_retrans_timer(chan); |
a2e12a2a | 3593 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3594 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3595 | return; |
e072745f | 3596 | } |
99b0d4b7 GP |
3597 | |
3598 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3599 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3600 | else |
525cd185 | 3601 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3602 | } |
3603 | ||
525cd185 | 3604 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3605 | { |
525cd185 | 3606 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3607 | |
9b16dc65 | 3608 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3609 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3610 | __clear_monitor_timer(chan); |
6a026610 | 3611 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3612 | __set_retrans_timer(chan); |
e2ab4353 | 3613 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
3614 | } |
3615 | ||
3616 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3617 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3618 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3619 | break; |
3620 | ||
e072745f | 3621 | case L2CAP_SUPER_REJECT: |
525cd185 | 3622 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3623 | break; |
2246b2f1 | 3624 | |
e072745f | 3625 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3626 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3627 | break; |
3628 | ||
3629 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3630 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3631 | break; |
3632 | } | |
3633 | ||
faaebd19 | 3634 | kfree_skb(skb); |
1c2acffb GP |
3635 | return 0; |
3636 | } | |
3637 | ||
218bb9df GP |
3638 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3639 | { | |
525cd185 | 3640 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3641 | u16 control; |
3642 | u8 req_seq; | |
3643 | int len, next_tx_seq_offset, req_seq_offset; | |
3644 | ||
3645 | control = get_unaligned_le16(skb->data); | |
3646 | skb_pull(skb, 2); | |
3647 | len = skb->len; | |
3648 | ||
3649 | /* | |
3650 | * We can just drop the corrupted I-frame here. | |
3651 | * Receiver will miss it and start proper recovery | |
3652 | * procedures and ask retransmission. | |
3653 | */ | |
47d1ec61 | 3654 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3655 | goto drop; |
3656 | ||
3657 | if (__is_sar_start(control) && __is_iframe(control)) | |
3658 | len -= 2; | |
3659 | ||
47d1ec61 | 3660 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3661 | len -= 2; |
3662 | ||
47d1ec61 | 3663 | if (len > chan->mps) { |
8c1d787b | 3664 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3665 | goto drop; |
3666 | } | |
3667 | ||
3668 | req_seq = __get_reqseq(control); | |
42e5c802 | 3669 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3670 | if (req_seq_offset < 0) |
3671 | req_seq_offset += 64; | |
3672 | ||
3673 | next_tx_seq_offset = | |
42e5c802 | 3674 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3675 | if (next_tx_seq_offset < 0) |
3676 | next_tx_seq_offset += 64; | |
3677 | ||
3678 | /* check for invalid req-seq */ | |
3679 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 3680 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3681 | goto drop; |
3682 | } | |
3683 | ||
3684 | if (__is_iframe(control)) { | |
3685 | if (len < 0) { | |
8c1d787b | 3686 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3687 | goto drop; |
3688 | } | |
3689 | ||
525cd185 | 3690 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3691 | } else { |
3692 | if (len != 0) { | |
3693 | BT_ERR("%d", len); | |
8c1d787b | 3694 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3695 | goto drop; |
3696 | } | |
3697 | ||
525cd185 | 3698 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3699 | } |
3700 | ||
3701 | return 0; | |
3702 | ||
3703 | drop: | |
3704 | kfree_skb(skb); | |
3705 | return 0; | |
3706 | } | |
3707 | ||
1da177e4 LT |
3708 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3709 | { | |
48454079 | 3710 | struct l2cap_chan *chan; |
bf734843 | 3711 | struct sock *sk = NULL; |
51893f88 | 3712 | u16 control; |
218bb9df GP |
3713 | u8 tx_seq; |
3714 | int len; | |
1da177e4 | 3715 | |
baa7e1fa | 3716 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3717 | if (!chan) { |
1da177e4 LT |
3718 | BT_DBG("unknown cid 0x%4.4x", cid); |
3719 | goto drop; | |
3720 | } | |
3721 | ||
48454079 | 3722 | sk = chan->sk; |
6840ed07 | 3723 | |
49208c9c | 3724 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 3725 | |
89bc500e | 3726 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
3727 | goto drop; |
3728 | ||
0c1bc5c6 | 3729 | switch (chan->mode) { |
1c2acffb GP |
3730 | case L2CAP_MODE_BASIC: |
3731 | /* If socket recv buffers overflows we drop data here | |
3732 | * which is *bad* because L2CAP has to be reliable. | |
3733 | * But we don't have any other choice. L2CAP doesn't | |
3734 | * provide flow control mechanism. */ | |
1da177e4 | 3735 | |
0c1bc5c6 | 3736 | if (chan->imtu < skb->len) |
1c2acffb | 3737 | goto drop; |
1da177e4 | 3738 | |
23070494 | 3739 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
3740 | goto done; |
3741 | break; | |
3742 | ||
3743 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3744 | if (!sock_owned_by_user(sk)) { |
3745 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3746 | } else { |
218bb9df | 3747 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3748 | goto drop; |
277ffbe3 | 3749 | } |
1c2acffb | 3750 | |
fcafde2e | 3751 | goto done; |
1c2acffb | 3752 | |
6840ed07 GP |
3753 | case L2CAP_MODE_STREAMING: |
3754 | control = get_unaligned_le16(skb->data); | |
3755 | skb_pull(skb, 2); | |
3756 | len = skb->len; | |
3757 | ||
47d1ec61 | 3758 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3759 | goto drop; |
3760 | ||
6840ed07 GP |
3761 | if (__is_sar_start(control)) |
3762 | len -= 2; | |
3763 | ||
47d1ec61 | 3764 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3765 | len -= 2; |
3766 | ||
47d1ec61 | 3767 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3768 | goto drop; |
3769 | ||
3770 | tx_seq = __get_txseq(control); | |
3771 | ||
84084a31 MM |
3772 | if (chan->expected_tx_seq != tx_seq) { |
3773 | /* Frame(s) missing - must discard partial SDU */ | |
3774 | kfree_skb(chan->sdu); | |
3775 | chan->sdu = NULL; | |
3776 | chan->sdu_last_frag = NULL; | |
3777 | chan->sdu_len = 0; | |
6840ed07 | 3778 | |
84084a31 MM |
3779 | /* TODO: Notify userland of missing data */ |
3780 | } | |
3781 | ||
3782 | chan->expected_tx_seq = (tx_seq + 1) % 64; | |
3783 | ||
3784 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
3785 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
3786 | |
3787 | goto done; | |
3788 | ||
1c2acffb | 3789 | default: |
0c1bc5c6 | 3790 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3791 | break; |
3792 | } | |
1da177e4 LT |
3793 | |
3794 | drop: | |
3795 | kfree_skb(skb); | |
3796 | ||
3797 | done: | |
0139418c MH |
3798 | if (sk) |
3799 | bh_unlock_sock(sk); | |
3800 | ||
1da177e4 LT |
3801 | return 0; |
3802 | } | |
3803 | ||
8e036fc3 | 3804 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 3805 | { |
6dcae1ea | 3806 | struct sock *sk = NULL; |
23691d75 | 3807 | struct l2cap_chan *chan; |
1da177e4 | 3808 | |
23691d75 GP |
3809 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
3810 | if (!chan) | |
1da177e4 LT |
3811 | goto drop; |
3812 | ||
23691d75 GP |
3813 | sk = chan->sk; |
3814 | ||
e0f0cb56 GP |
3815 | bh_lock_sock(sk); |
3816 | ||
1da177e4 LT |
3817 | BT_DBG("sk %p, len %d", sk, skb->len); |
3818 | ||
89bc500e | 3819 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
3820 | goto drop; |
3821 | ||
e13e21dc | 3822 | if (chan->imtu < skb->len) |
1da177e4 LT |
3823 | goto drop; |
3824 | ||
23070494 | 3825 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
3826 | goto done; |
3827 | ||
3828 | drop: | |
3829 | kfree_skb(skb); | |
3830 | ||
3831 | done: | |
af05b30b GP |
3832 | if (sk) |
3833 | bh_unlock_sock(sk); | |
1da177e4 LT |
3834 | return 0; |
3835 | } | |
3836 | ||
9f69bda6 GP |
3837 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3838 | { | |
6dcae1ea | 3839 | struct sock *sk = NULL; |
23691d75 | 3840 | struct l2cap_chan *chan; |
9f69bda6 | 3841 | |
23691d75 GP |
3842 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
3843 | if (!chan) | |
9f69bda6 GP |
3844 | goto drop; |
3845 | ||
23691d75 GP |
3846 | sk = chan->sk; |
3847 | ||
9f69bda6 GP |
3848 | bh_lock_sock(sk); |
3849 | ||
3850 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3851 | ||
89bc500e | 3852 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
3853 | goto drop; |
3854 | ||
e13e21dc | 3855 | if (chan->imtu < skb->len) |
9f69bda6 GP |
3856 | goto drop; |
3857 | ||
23070494 | 3858 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
3859 | goto done; |
3860 | ||
3861 | drop: | |
3862 | kfree_skb(skb); | |
3863 | ||
3864 | done: | |
3865 | if (sk) | |
3866 | bh_unlock_sock(sk); | |
3867 | return 0; | |
3868 | } | |
3869 | ||
1da177e4 LT |
3870 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3871 | { | |
3872 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3873 | u16 cid, len; |
3874 | __le16 psm; | |
1da177e4 LT |
3875 | |
3876 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3877 | cid = __le16_to_cpu(lh->cid); | |
3878 | len = __le16_to_cpu(lh->len); | |
3879 | ||
1c2acffb GP |
3880 | if (len != skb->len) { |
3881 | kfree_skb(skb); | |
3882 | return; | |
3883 | } | |
3884 | ||
1da177e4 LT |
3885 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3886 | ||
3887 | switch (cid) { | |
3300d9a9 | 3888 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3889 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3890 | l2cap_sig_channel(conn, skb); |
3891 | break; | |
3892 | ||
8db4dc46 | 3893 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3894 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3895 | skb_pull(skb, 2); |
3896 | l2cap_conless_channel(conn, psm, skb); | |
3897 | break; | |
3898 | ||
9f69bda6 GP |
3899 | case L2CAP_CID_LE_DATA: |
3900 | l2cap_att_channel(conn, cid, skb); | |
3901 | break; | |
3902 | ||
b501d6a1 AB |
3903 | case L2CAP_CID_SMP: |
3904 | if (smp_sig_channel(conn, skb)) | |
3905 | l2cap_conn_del(conn->hcon, EACCES); | |
3906 | break; | |
3907 | ||
1da177e4 LT |
3908 | default: |
3909 | l2cap_data_channel(conn, cid, skb); | |
3910 | break; | |
3911 | } | |
3912 | } | |
3913 | ||
3914 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3915 | ||
3916 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3917 | { | |
3918 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 3919 | struct l2cap_chan *c; |
1da177e4 LT |
3920 | |
3921 | if (type != ACL_LINK) | |
963cf687 | 3922 | return -EINVAL; |
1da177e4 LT |
3923 | |
3924 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3925 | ||
3926 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
3927 | read_lock(&chan_list_lock); |
3928 | list_for_each_entry(c, &chan_list, global_l) { | |
3929 | struct sock *sk = c->sk; | |
4343478f | 3930 | |
89bc500e | 3931 | if (c->state != BT_LISTEN) |
1da177e4 LT |
3932 | continue; |
3933 | ||
3934 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 3935 | lm1 |= HCI_LM_ACCEPT; |
23691d75 | 3936 | if (c->role_switch) |
2af6b9d5 | 3937 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 3938 | exact++; |
2af6b9d5 MH |
3939 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3940 | lm2 |= HCI_LM_ACCEPT; | |
23691d75 | 3941 | if (c->role_switch) |
2af6b9d5 MH |
3942 | lm2 |= HCI_LM_MASTER; |
3943 | } | |
1da177e4 | 3944 | } |
23691d75 | 3945 | read_unlock(&chan_list_lock); |
1da177e4 LT |
3946 | |
3947 | return exact ? lm1 : lm2; | |
3948 | } | |
3949 | ||
3950 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3951 | { | |
0139418c MH |
3952 | struct l2cap_conn *conn; |
3953 | ||
1da177e4 LT |
3954 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3955 | ||
acd7d370 | 3956 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3957 | return -EINVAL; |
1da177e4 LT |
3958 | |
3959 | if (!status) { | |
1da177e4 LT |
3960 | conn = l2cap_conn_add(hcon, status); |
3961 | if (conn) | |
3962 | l2cap_conn_ready(conn); | |
0139418c | 3963 | } else |
e175072f | 3964 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
3965 | |
3966 | return 0; | |
3967 | } | |
3968 | ||
2950f21a MH |
3969 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3970 | { | |
3971 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3972 | ||
3973 | BT_DBG("hcon %p", hcon); | |
3974 | ||
b5694506 | 3975 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
2950f21a MH |
3976 | return 0x13; |
3977 | ||
3978 | return conn->disc_reason; | |
3979 | } | |
3980 | ||
3981 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3982 | { |
3983 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3984 | ||
acd7d370 | 3985 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3986 | return -EINVAL; |
1da177e4 | 3987 | |
e175072f | 3988 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 3989 | |
1da177e4 LT |
3990 | return 0; |
3991 | } | |
3992 | ||
4343478f | 3993 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 3994 | { |
715ec005 | 3995 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
3996 | return; |
3997 | ||
f62e4323 | 3998 | if (encrypt == 0x00) { |
4343478f | 3999 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 GP |
4000 | __clear_chan_timer(chan); |
4001 | __set_chan_timer(chan, HZ * 5); | |
4343478f | 4002 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4003 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4004 | } else { |
4343478f | 4005 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4006 | __clear_chan_timer(chan); |
f62e4323 MH |
4007 | } |
4008 | } | |
4009 | ||
8c1b2355 | 4010 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4011 | { |
0139418c | 4012 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4013 | struct l2cap_chan *chan; |
1da177e4 | 4014 | |
0139418c | 4015 | if (!conn) |
1da177e4 | 4016 | return 0; |
0139418c | 4017 | |
1da177e4 LT |
4018 | BT_DBG("conn %p", conn); |
4019 | ||
160dc6ac VCG |
4020 | if (hcon->type == LE_LINK) { |
4021 | smp_distribute_keys(conn, 0); | |
4022 | del_timer(&conn->security_timer); | |
4023 | } | |
4024 | ||
baa7e1fa | 4025 | read_lock(&conn->chan_lock); |
1da177e4 | 4026 | |
baa7e1fa | 4027 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4028 | struct sock *sk = chan->sk; |
baa7e1fa | 4029 | |
1da177e4 LT |
4030 | bh_lock_sock(sk); |
4031 | ||
f1cb9af5 VCG |
4032 | BT_DBG("chan->scid %d", chan->scid); |
4033 | ||
4034 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4035 | if (!status && encrypt) { | |
4036 | chan->sec_level = hcon->sec_level; | |
4037 | l2cap_chan_ready(sk); | |
4038 | } | |
4039 | ||
4040 | bh_unlock_sock(sk); | |
4041 | continue; | |
4042 | } | |
4043 | ||
c1360a1c | 4044 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4045 | bh_unlock_sock(sk); |
4046 | continue; | |
4047 | } | |
4048 | ||
89bc500e GP |
4049 | if (!status && (chan->state == BT_CONNECTED || |
4050 | chan->state == BT_CONFIG)) { | |
4343478f | 4051 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4052 | bh_unlock_sock(sk); |
4053 | continue; | |
4054 | } | |
4055 | ||
89bc500e | 4056 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4057 | if (!status) { |
4058 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4059 | req.scid = cpu_to_le16(chan->scid); |
4060 | req.psm = chan->psm; | |
1da177e4 | 4061 | |
fc7f8a7e | 4062 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4063 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4064 | |
fc7f8a7e | 4065 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4066 | L2CAP_CONN_REQ, sizeof(req), &req); |
4067 | } else { | |
c9b66675 GP |
4068 | __clear_chan_timer(chan); |
4069 | __set_chan_timer(chan, HZ / 10); | |
b1235d79 | 4070 | } |
89bc500e | 4071 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4072 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4073 | __u16 res, stat; |
1da177e4 | 4074 | |
b1235d79 | 4075 | if (!status) { |
df3c3931 JH |
4076 | if (bt_sk(sk)->defer_setup) { |
4077 | struct sock *parent = bt_sk(sk)->parent; | |
4078 | res = L2CAP_CR_PEND; | |
4079 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4080 | if (parent) |
4081 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4082 | } else { |
05558911 | 4083 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4084 | res = L2CAP_CR_SUCCESS; |
4085 | stat = L2CAP_CS_NO_INFO; | |
4086 | } | |
b1235d79 | 4087 | } else { |
89bc500e | 4088 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 4089 | __set_chan_timer(chan, HZ / 10); |
df3c3931 JH |
4090 | res = L2CAP_CR_SEC_BLOCK; |
4091 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4092 | } |
4093 | ||
fe4128e0 GP |
4094 | rsp.scid = cpu_to_le16(chan->dcid); |
4095 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4096 | rsp.result = cpu_to_le16(res); |
4097 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4098 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4099 | sizeof(rsp), &rsp); | |
b1235d79 | 4100 | } |
1da177e4 LT |
4101 | |
4102 | bh_unlock_sock(sk); | |
4103 | } | |
4104 | ||
baa7e1fa | 4105 | read_unlock(&conn->chan_lock); |
b1235d79 | 4106 | |
1da177e4 LT |
4107 | return 0; |
4108 | } | |
4109 | ||
4110 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4111 | { | |
4112 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4113 | ||
5a08ecce AE |
4114 | if (!conn) |
4115 | conn = l2cap_conn_add(hcon, 0); | |
4116 | ||
4117 | if (!conn) | |
1da177e4 LT |
4118 | goto drop; |
4119 | ||
4120 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4121 | ||
e702112f | 4122 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4123 | struct l2cap_hdr *hdr; |
48454079 | 4124 | struct l2cap_chan *chan; |
89794813 | 4125 | u16 cid; |
1da177e4 LT |
4126 | int len; |
4127 | ||
4128 | if (conn->rx_len) { | |
4129 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4130 | kfree_skb(conn->rx_skb); | |
4131 | conn->rx_skb = NULL; | |
4132 | conn->rx_len = 0; | |
4133 | l2cap_conn_unreliable(conn, ECOMM); | |
4134 | } | |
4135 | ||
aae7fe22 AE |
4136 | /* Start fragment always begin with Basic L2CAP header */ |
4137 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4138 | BT_ERR("Frame is too short (len %d)", skb->len); |
4139 | l2cap_conn_unreliable(conn, ECOMM); | |
4140 | goto drop; | |
4141 | } | |
4142 | ||
4143 | hdr = (struct l2cap_hdr *) skb->data; | |
4144 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4145 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4146 | |
4147 | if (len == skb->len) { | |
4148 | /* Complete frame received */ | |
4149 | l2cap_recv_frame(conn, skb); | |
4150 | return 0; | |
4151 | } | |
4152 | ||
4153 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4154 | ||
4155 | if (skb->len > len) { | |
4156 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4157 | skb->len, len); | |
4158 | l2cap_conn_unreliable(conn, ECOMM); | |
4159 | goto drop; | |
4160 | } | |
4161 | ||
baa7e1fa | 4162 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4163 | |
48454079 GP |
4164 | if (chan && chan->sk) { |
4165 | struct sock *sk = chan->sk; | |
89794813 | 4166 | |
0c1bc5c6 | 4167 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4168 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4169 | "MTU %d)", len, | |
0c1bc5c6 | 4170 | chan->imtu); |
48454079 GP |
4171 | bh_unlock_sock(sk); |
4172 | l2cap_conn_unreliable(conn, ECOMM); | |
4173 | goto drop; | |
4174 | } | |
89794813 | 4175 | bh_unlock_sock(sk); |
48454079 | 4176 | } |
89794813 | 4177 | |
1da177e4 | 4178 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4179 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4180 | if (!conn->rx_skb) | |
1da177e4 LT |
4181 | goto drop; |
4182 | ||
d626f62b | 4183 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4184 | skb->len); |
1da177e4 LT |
4185 | conn->rx_len = len - skb->len; |
4186 | } else { | |
4187 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4188 | ||
4189 | if (!conn->rx_len) { | |
4190 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4191 | l2cap_conn_unreliable(conn, ECOMM); | |
4192 | goto drop; | |
4193 | } | |
4194 | ||
4195 | if (skb->len > conn->rx_len) { | |
4196 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4197 | skb->len, conn->rx_len); | |
4198 | kfree_skb(conn->rx_skb); | |
4199 | conn->rx_skb = NULL; | |
4200 | conn->rx_len = 0; | |
4201 | l2cap_conn_unreliable(conn, ECOMM); | |
4202 | goto drop; | |
4203 | } | |
4204 | ||
d626f62b | 4205 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4206 | skb->len); |
1da177e4 LT |
4207 | conn->rx_len -= skb->len; |
4208 | ||
4209 | if (!conn->rx_len) { | |
4210 | /* Complete frame received */ | |
4211 | l2cap_recv_frame(conn, conn->rx_skb); | |
4212 | conn->rx_skb = NULL; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | drop: | |
4217 | kfree_skb(skb); | |
4218 | return 0; | |
4219 | } | |
4220 | ||
aef7d97c | 4221 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4222 | { |
23691d75 | 4223 | struct l2cap_chan *c; |
1da177e4 | 4224 | |
23691d75 | 4225 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4226 | |
23691d75 GP |
4227 | list_for_each_entry(c, &chan_list, global_l) { |
4228 | struct sock *sk = c->sk; | |
101545f6 | 4229 | |
903d343e | 4230 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4231 | batostr(&bt_sk(sk)->src), |
4232 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4233 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4234 | c->scid, c->dcid, c->imtu, c->omtu, |
4235 | c->sec_level, c->mode); | |
05558911 | 4236 | } |
1da177e4 | 4237 | |
23691d75 | 4238 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4239 | |
aef7d97c | 4240 | return 0; |
1da177e4 LT |
4241 | } |
4242 | ||
aef7d97c MH |
4243 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4244 | { | |
4245 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4246 | } | |
4247 | ||
4248 | static const struct file_operations l2cap_debugfs_fops = { | |
4249 | .open = l2cap_debugfs_open, | |
4250 | .read = seq_read, | |
4251 | .llseek = seq_lseek, | |
4252 | .release = single_release, | |
4253 | }; | |
4254 | ||
4255 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4256 | |
1da177e4 LT |
4257 | static struct hci_proto l2cap_hci_proto = { |
4258 | .name = "L2CAP", | |
4259 | .id = HCI_PROTO_L2CAP, | |
4260 | .connect_ind = l2cap_connect_ind, | |
4261 | .connect_cfm = l2cap_connect_cfm, | |
4262 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4263 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4264 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4265 | .recv_acldata = l2cap_recv_acldata |
4266 | }; | |
4267 | ||
64274518 | 4268 | int __init l2cap_init(void) |
1da177e4 LT |
4269 | { |
4270 | int err; | |
be9d1227 | 4271 | |
bb58f747 | 4272 | err = l2cap_init_sockets(); |
1da177e4 LT |
4273 | if (err < 0) |
4274 | return err; | |
4275 | ||
1da177e4 LT |
4276 | err = hci_register_proto(&l2cap_hci_proto); |
4277 | if (err < 0) { | |
4278 | BT_ERR("L2CAP protocol registration failed"); | |
4279 | bt_sock_unregister(BTPROTO_L2CAP); | |
4280 | goto error; | |
4281 | } | |
4282 | ||
aef7d97c MH |
4283 | if (bt_debugfs) { |
4284 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4285 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4286 | if (!l2cap_debugfs) | |
4287 | BT_ERR("Failed to create L2CAP debug file"); | |
4288 | } | |
1da177e4 | 4289 | |
1da177e4 LT |
4290 | return 0; |
4291 | ||
4292 | error: | |
bb58f747 | 4293 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4294 | return err; |
4295 | } | |
4296 | ||
64274518 | 4297 | void l2cap_exit(void) |
1da177e4 | 4298 | { |
aef7d97c | 4299 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4300 | |
1da177e4 LT |
4301 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4302 | BT_ERR("L2CAP protocol unregistration failed"); | |
4303 | ||
bb58f747 | 4304 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4305 | } |
4306 | ||
d1c4a17d GP |
4307 | module_param(disable_ertm, bool, 0644); |
4308 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |