Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 57 | #include <net/bluetooth/smp.h> |
1da177e4 | 58 | |
bb58f747 | 59 | int disable_ertm; |
f0709e03 | 60 | |
47ec1dcd | 61 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
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 | ||
baa7e1fa | 910 | read_lock(&conn->chan_lock); |
4e8402a3 | 911 | |
baa7e1fa | 912 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 913 | struct sock *sk = chan->sk; |
baa7e1fa | 914 | |
79d554a6 | 915 | bh_lock_sock(sk); |
4e8402a3 | 916 | |
63128451 | 917 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 918 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 919 | l2cap_chan_ready(sk); |
acd7d370 | 920 | |
63128451 | 921 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 922 | __clear_chan_timer(chan); |
89bc500e | 923 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 924 | sk->sk_state_change(sk); |
b501d6a1 | 925 | |
89bc500e | 926 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 927 | l2cap_do_start(chan); |
4e8402a3 | 928 | |
79d554a6 | 929 | bh_unlock_sock(sk); |
4e8402a3 | 930 | } |
79d554a6 | 931 | |
baa7e1fa | 932 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
933 | } |
934 | ||
935 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
936 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
937 | { | |
48454079 | 938 | struct l2cap_chan *chan; |
4e8402a3 MH |
939 | |
940 | BT_DBG("conn %p", conn); | |
941 | ||
baa7e1fa | 942 | read_lock(&conn->chan_lock); |
4e8402a3 | 943 | |
baa7e1fa | 944 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 945 | struct sock *sk = chan->sk; |
baa7e1fa | 946 | |
4343478f | 947 | if (chan->force_reliable) |
4e8402a3 MH |
948 | sk->sk_err = err; |
949 | } | |
950 | ||
baa7e1fa | 951 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
952 | } |
953 | ||
954 | static void l2cap_info_timeout(unsigned long arg) | |
955 | { | |
956 | struct l2cap_conn *conn = (void *) arg; | |
957 | ||
984947dc | 958 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 959 | conn->info_ident = 0; |
984947dc | 960 | |
4e8402a3 MH |
961 | l2cap_conn_start(conn); |
962 | } | |
963 | ||
5d3de7df VCG |
964 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
965 | { | |
966 | struct l2cap_conn *conn = hcon->l2cap_data; | |
967 | struct l2cap_chan *chan, *l; | |
968 | struct sock *sk; | |
969 | ||
970 | if (!conn) | |
971 | return; | |
972 | ||
973 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
974 | ||
975 | kfree_skb(conn->rx_skb); | |
976 | ||
977 | /* Kill channels */ | |
978 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
979 | sk = chan->sk; | |
980 | bh_lock_sock(sk); | |
981 | l2cap_chan_del(chan, err); | |
982 | bh_unlock_sock(sk); | |
983 | chan->ops->close(chan->data); | |
984 | } | |
985 | ||
986 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) | |
987 | del_timer_sync(&conn->info_timer); | |
988 | ||
989 | if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) | |
990 | del_timer(&conn->security_timer); | |
991 | ||
992 | hcon->l2cap_data = NULL; | |
993 | kfree(conn); | |
994 | } | |
995 | ||
996 | static void security_timeout(unsigned long arg) | |
997 | { | |
998 | struct l2cap_conn *conn = (void *) arg; | |
999 | ||
1000 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1004 | { | |
0139418c | 1005 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 1006 | |
0139418c | 1007 | if (conn || status) |
1da177e4 LT |
1008 | return conn; |
1009 | ||
0139418c MH |
1010 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
1011 | if (!conn) | |
1da177e4 | 1012 | return NULL; |
1da177e4 LT |
1013 | |
1014 | hcon->l2cap_data = conn; | |
1015 | conn->hcon = hcon; | |
1016 | ||
0139418c MH |
1017 | BT_DBG("hcon %p conn %p", hcon, conn); |
1018 | ||
acd7d370 VT |
1019 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1020 | conn->mtu = hcon->hdev->le_mtu; | |
1021 | else | |
1022 | conn->mtu = hcon->hdev->acl_mtu; | |
1023 | ||
1da177e4 LT |
1024 | conn->src = &hcon->hdev->bdaddr; |
1025 | conn->dst = &hcon->dst; | |
1026 | ||
4e8402a3 MH |
1027 | conn->feat_mask = 0; |
1028 | ||
1da177e4 | 1029 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1030 | rwlock_init(&conn->chan_lock); |
1031 | ||
1032 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1033 | |
5d3de7df VCG |
1034 | if (hcon->type == LE_LINK) |
1035 | setup_timer(&conn->security_timer, security_timeout, | |
1036 | (unsigned long) conn); | |
1037 | else | |
b62f328b | 1038 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
45054dc1 DY |
1039 | (unsigned long) conn); |
1040 | ||
2950f21a MH |
1041 | conn->disc_reason = 0x13; |
1042 | ||
1da177e4 LT |
1043 | return conn; |
1044 | } | |
1045 | ||
48454079 | 1046 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1047 | { |
baa7e1fa | 1048 | write_lock_bh(&conn->chan_lock); |
48454079 | 1049 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1050 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1051 | } |
1052 | ||
1da177e4 | 1053 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1054 | |
1055 | /* Find socket with psm and source bdaddr. | |
1056 | * Returns closest match. | |
1057 | */ | |
23691d75 | 1058 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1059 | { |
23691d75 | 1060 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1061 | |
23691d75 | 1062 | read_lock(&chan_list_lock); |
e0f0cb56 | 1063 | |
23691d75 GP |
1064 | list_for_each_entry(c, &chan_list, global_l) { |
1065 | struct sock *sk = c->sk; | |
fe4128e0 | 1066 | |
89bc500e | 1067 | if (state && c->state != state) |
1da177e4 LT |
1068 | continue; |
1069 | ||
23691d75 | 1070 | if (c->psm == psm) { |
1da177e4 | 1071 | /* Exact match. */ |
23691d75 | 1072 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1073 | read_unlock(&chan_list_lock); |
23691d75 GP |
1074 | return c; |
1075 | } | |
1da177e4 LT |
1076 | |
1077 | /* Closest match */ | |
1078 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1079 | c1 = c; |
1da177e4 LT |
1080 | } |
1081 | } | |
1da177e4 | 1082 | |
23691d75 | 1083 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1084 | |
23691d75 | 1085 | return c1; |
1da177e4 LT |
1086 | } |
1087 | ||
77a74c7e | 1088 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1089 | { |
5d41ce1d | 1090 | struct sock *sk = chan->sk; |
1da177e4 LT |
1091 | bdaddr_t *src = &bt_sk(sk)->src; |
1092 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1093 | struct l2cap_conn *conn; | |
1094 | struct hci_conn *hcon; | |
1095 | struct hci_dev *hdev; | |
09ab6f4c | 1096 | __u8 auth_type; |
44d0e48e | 1097 | int err; |
1da177e4 | 1098 | |
f29972de | 1099 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1100 | chan->psm); |
1da177e4 | 1101 | |
af05b30b GP |
1102 | hdev = hci_get_route(dst, src); |
1103 | if (!hdev) | |
1da177e4 LT |
1104 | return -EHOSTUNREACH; |
1105 | ||
1106 | hci_dev_lock_bh(hdev); | |
1107 | ||
4343478f | 1108 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1109 | |
fe4128e0 | 1110 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1111 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1112 | chan->sec_level, auth_type); |
acd7d370 VT |
1113 | else |
1114 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1115 | chan->sec_level, auth_type); |
acd7d370 | 1116 | |
30e76272 VT |
1117 | if (IS_ERR(hcon)) { |
1118 | err = PTR_ERR(hcon); | |
1da177e4 | 1119 | goto done; |
30e76272 | 1120 | } |
1da177e4 LT |
1121 | |
1122 | conn = l2cap_conn_add(hcon, 0); | |
1123 | if (!conn) { | |
1124 | hci_conn_put(hcon); | |
30e76272 | 1125 | err = -ENOMEM; |
1da177e4 LT |
1126 | goto done; |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | /* Update source addr of the socket */ |
1130 | bacpy(src, conn->src); | |
1131 | ||
48454079 GP |
1132 | l2cap_chan_add(conn, chan); |
1133 | ||
89bc500e | 1134 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1135 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1136 | |
1137 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1138 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1139 | __clear_chan_timer(chan); |
4343478f | 1140 | if (l2cap_check_security(chan)) |
89bc500e | 1141 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1142 | } else |
fc7f8a7e | 1143 | l2cap_do_start(chan); |
1da177e4 LT |
1144 | } |
1145 | ||
30e76272 VT |
1146 | err = 0; |
1147 | ||
1da177e4 LT |
1148 | done: |
1149 | hci_dev_unlock_bh(hdev); | |
1150 | hci_dev_put(hdev); | |
1151 | return err; | |
1152 | } | |
1153 | ||
dcba0dba | 1154 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1155 | { |
8c1d787b | 1156 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1157 | DECLARE_WAITQUEUE(wait, current); |
1158 | int err = 0; | |
1159 | int timeo = HZ/5; | |
1160 | ||
2b0b05dd | 1161 | add_wait_queue(sk_sleep(sk), &wait); |
8c1d787b | 1162 | while ((chan->unacked_frames > 0 && chan->conn)) { |
6161c038 GP |
1163 | set_current_state(TASK_INTERRUPTIBLE); |
1164 | ||
1165 | if (!timeo) | |
1166 | timeo = HZ/5; | |
1167 | ||
1168 | if (signal_pending(current)) { | |
1169 | err = sock_intr_errno(timeo); | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | release_sock(sk); | |
1174 | timeo = schedule_timeout(timeo); | |
1175 | lock_sock(sk); | |
1176 | ||
1177 | err = sock_error(sk); | |
1178 | if (err) | |
1179 | break; | |
1180 | } | |
1181 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1182 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1183 | return err; |
1184 | } | |
1185 | ||
e90bac06 GP |
1186 | static void l2cap_monitor_timeout(unsigned long arg) |
1187 | { | |
525cd185 GP |
1188 | struct l2cap_chan *chan = (void *) arg; |
1189 | struct sock *sk = chan->sk; | |
e90bac06 | 1190 | |
525cd185 | 1191 | BT_DBG("chan %p", chan); |
0e98958d | 1192 | |
e686219a | 1193 | bh_lock_sock(sk); |
2c03a7a4 | 1194 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1195 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1196 | bh_unlock_sock(sk); |
e90bac06 GP |
1197 | return; |
1198 | } | |
1199 | ||
6a026610 | 1200 | chan->retry_count++; |
1a09bcb9 | 1201 | __set_monitor_timer(chan); |
e90bac06 | 1202 | |
525cd185 | 1203 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1204 | bh_unlock_sock(sk); |
e90bac06 GP |
1205 | } |
1206 | ||
1207 | static void l2cap_retrans_timeout(unsigned long arg) | |
1208 | { | |
525cd185 GP |
1209 | struct l2cap_chan *chan = (void *) arg; |
1210 | struct sock *sk = chan->sk; | |
e90bac06 | 1211 | |
49208c9c | 1212 | BT_DBG("chan %p", chan); |
0e98958d | 1213 | |
e686219a | 1214 | bh_lock_sock(sk); |
6a026610 | 1215 | chan->retry_count = 1; |
1a09bcb9 | 1216 | __set_monitor_timer(chan); |
e90bac06 | 1217 | |
e2ab4353 | 1218 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1219 | |
525cd185 | 1220 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1221 | bh_unlock_sock(sk); |
e90bac06 GP |
1222 | } |
1223 | ||
42e5c802 | 1224 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1225 | { |
1c2acffb | 1226 | struct sk_buff *skb; |
1da177e4 | 1227 | |
58d35f87 | 1228 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1229 | chan->unacked_frames) { |
42e5c802 | 1230 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1231 | break; |
1da177e4 | 1232 | |
58d35f87 | 1233 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1234 | kfree_skb(skb); |
1da177e4 | 1235 | |
6a026610 | 1236 | chan->unacked_frames--; |
1c2acffb | 1237 | } |
1da177e4 | 1238 | |
6a026610 | 1239 | if (!chan->unacked_frames) |
1a09bcb9 | 1240 | __clear_retrans_timer(chan); |
1c2acffb | 1241 | } |
1da177e4 | 1242 | |
4343478f | 1243 | void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1244 | { |
8c1d787b | 1245 | struct hci_conn *hcon = chan->conn->hcon; |
e702112f | 1246 | u16 flags; |
1c2acffb | 1247 | |
4343478f | 1248 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1249 | |
4343478f | 1250 | if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) |
e702112f AE |
1251 | flags = ACL_START_NO_FLUSH; |
1252 | else | |
1253 | flags = ACL_START; | |
1254 | ||
14b12d0b | 1255 | bt_cb(skb)->force_active = chan->force_active; |
e702112f | 1256 | hci_send_acl(hcon, skb, flags); |
1c2acffb GP |
1257 | } |
1258 | ||
42e5c802 | 1259 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1260 | { |
ccbb84af | 1261 | struct sk_buff *skb; |
fcc203c3 | 1262 | u16 control, fcs; |
6840ed07 | 1263 | |
58d35f87 | 1264 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1265 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1266 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1267 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1268 | |
47d1ec61 | 1269 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1270 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1271 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1272 | } |
1273 | ||
4343478f | 1274 | l2cap_do_send(chan, skb); |
6840ed07 | 1275 | |
42e5c802 | 1276 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1277 | } |
6840ed07 GP |
1278 | } |
1279 | ||
525cd185 | 1280 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1281 | { |
8f17154f GP |
1282 | struct sk_buff *skb, *tx_skb; |
1283 | u16 control, fcs; | |
8f17154f | 1284 | |
58d35f87 | 1285 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1286 | if (!skb) |
1287 | return; | |
8f17154f | 1288 | |
f11d676d GP |
1289 | do { |
1290 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1291 | break; |
8f17154f | 1292 | |
58d35f87 | 1293 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1294 | return; |
8f17154f | 1295 | |
58d35f87 | 1296 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1297 | |
2c03a7a4 GP |
1298 | if (chan->remote_max_tx && |
1299 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1300 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1301 | return; |
1302 | } | |
1303 | ||
1304 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1305 | bt_cb(skb)->retries++; | |
1306 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1307 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1308 | |
e2ab4353 | 1309 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
3cb123d1 | 1310 | control |= L2CAP_CTRL_FINAL; |
95ffa978 | 1311 | |
42e5c802 | 1312 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1313 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1314 | |
f11d676d GP |
1315 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1316 | ||
47d1ec61 | 1317 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1318 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1319 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1320 | } | |
1321 | ||
4343478f | 1322 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1323 | } |
1324 | ||
525cd185 | 1325 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1326 | { |
1327 | struct sk_buff *skb, *tx_skb; | |
fcc203c3 | 1328 | u16 control, fcs; |
9a9c6a34 | 1329 | int nsent = 0; |
1c2acffb | 1330 | |
89bc500e | 1331 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1332 | return -ENOTCONN; |
e90bac06 | 1333 | |
58d35f87 | 1334 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1335 | |
2c03a7a4 GP |
1336 | if (chan->remote_max_tx && |
1337 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1338 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1339 | break; |
1340 | } | |
1341 | ||
e420aba3 AE |
1342 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1343 | ||
e90bac06 GP |
1344 | bt_cb(skb)->retries++; |
1345 | ||
1c2acffb | 1346 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1347 | control &= L2CAP_CTRL_SAR; |
1348 | ||
e2ab4353 | 1349 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
d5392c8f | 1350 | control |= L2CAP_CTRL_FINAL; |
e2ab4353 | 1351 | |
42e5c802 GP |
1352 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1353 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1354 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1355 | ||
e90bac06 | 1356 | |
47d1ec61 | 1357 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1358 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1359 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1360 | } | |
1361 | ||
4343478f | 1362 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1363 | |
1a09bcb9 | 1364 | __set_retrans_timer(chan); |
1c2acffb | 1365 | |
42e5c802 GP |
1366 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1367 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1368 | |
23e9fde2 | 1369 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1370 | chan->unacked_frames++; |
23e9fde2 | 1371 | |
6a026610 | 1372 | chan->frames_sent++; |
1c2acffb | 1373 | |
58d35f87 GP |
1374 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1375 | chan->tx_send_head = NULL; | |
1c2acffb | 1376 | else |
58d35f87 | 1377 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1378 | |
1379 | nsent++; | |
1c2acffb GP |
1380 | } |
1381 | ||
9e917af1 GP |
1382 | return nsent; |
1383 | } | |
1384 | ||
525cd185 | 1385 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1386 | { |
dfc909be GP |
1387 | int ret; |
1388 | ||
58d35f87 GP |
1389 | if (!skb_queue_empty(&chan->tx_q)) |
1390 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1391 | |
42e5c802 | 1392 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1393 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1394 | return ret; |
1395 | } | |
1396 | ||
525cd185 | 1397 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1398 | { |
9e917af1 GP |
1399 | u16 control = 0; |
1400 | ||
42e5c802 | 1401 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1402 | |
e2ab4353 | 1403 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
9e917af1 | 1404 | control |= L2CAP_SUPER_RCV_NOT_READY; |
e2ab4353 | 1405 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1406 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1407 | return; |
9e917af1 | 1408 | } |
dfc909be | 1409 | |
525cd185 | 1410 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1411 | return; |
1412 | ||
1413 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1414 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1415 | } |
1416 | ||
525cd185 | 1417 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1418 | { |
1419 | struct srej_list *tail; | |
1420 | u16 control; | |
1421 | ||
1422 | control = L2CAP_SUPER_SELECT_REJECT; | |
1423 | control |= L2CAP_CTRL_FINAL; | |
1424 | ||
39d5a3ee | 1425 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1426 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1427 | ||
525cd185 | 1428 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1429 | } |
1430 | ||
1c2acffb GP |
1431 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1432 | { | |
8c1d787b | 1433 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1434 | struct sk_buff **frag; |
1435 | int err, sent = 0; | |
1da177e4 | 1436 | |
59203a21 | 1437 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1438 | return -EFAULT; |
1da177e4 LT |
1439 | |
1440 | sent += count; | |
1441 | len -= count; | |
1442 | ||
1443 | /* Continuation fragments (no L2CAP header) */ | |
1444 | frag = &skb_shinfo(skb)->frag_list; | |
1445 | while (len) { | |
1446 | count = min_t(unsigned int, conn->mtu, len); | |
1447 | ||
1448 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1449 | if (!*frag) | |
0175d629 | 1450 | return err; |
1c2acffb GP |
1451 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1452 | return -EFAULT; | |
1da177e4 LT |
1453 | |
1454 | sent += count; | |
1455 | len -= count; | |
1456 | ||
1457 | frag = &(*frag)->next; | |
1458 | } | |
1da177e4 LT |
1459 | |
1460 | return sent; | |
1c2acffb | 1461 | } |
1da177e4 | 1462 | |
fe4128e0 | 1463 | struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1464 | { |
fe4128e0 | 1465 | struct sock *sk = chan->sk; |
8c1d787b | 1466 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1467 | struct sk_buff *skb; |
1468 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1469 | struct l2cap_hdr *lh; | |
1470 | ||
1471 | BT_DBG("sk %p len %d", sk, (int)len); | |
1472 | ||
1473 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1474 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1475 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1476 | if (!skb) | |
0175d629 | 1477 | return ERR_PTR(err); |
1c2acffb GP |
1478 | |
1479 | /* Create L2CAP header */ | |
1480 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1481 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1482 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1483 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1484 | |
1485 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1486 | if (unlikely(err < 0)) { | |
1487 | kfree_skb(skb); | |
1488 | return ERR_PTR(err); | |
1489 | } | |
1490 | return skb; | |
1491 | } | |
1492 | ||
fe4128e0 | 1493 | struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1494 | { |
fe4128e0 | 1495 | struct sock *sk = chan->sk; |
8c1d787b | 1496 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1497 | struct sk_buff *skb; |
1498 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1499 | struct l2cap_hdr *lh; | |
1500 | ||
1501 | BT_DBG("sk %p len %d", sk, (int)len); | |
1502 | ||
1503 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1504 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1505 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1506 | if (!skb) | |
0175d629 | 1507 | return ERR_PTR(err); |
1c2acffb GP |
1508 | |
1509 | /* Create L2CAP header */ | |
1510 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1511 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1512 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1513 | ||
1514 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1515 | if (unlikely(err < 0)) { | |
1516 | kfree_skb(skb); | |
1517 | return ERR_PTR(err); | |
1518 | } | |
1519 | return skb; | |
1520 | } | |
1521 | ||
47d1ec61 | 1522 | struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb | 1523 | { |
47d1ec61 | 1524 | struct sock *sk = chan->sk; |
8c1d787b | 1525 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1526 | struct sk_buff *skb; |
1527 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1528 | struct l2cap_hdr *lh; | |
1529 | ||
1530 | BT_DBG("sk %p len %d", sk, (int)len); | |
1531 | ||
0ee0d208 GP |
1532 | if (!conn) |
1533 | return ERR_PTR(-ENOTCONN); | |
1534 | ||
c74e560c GP |
1535 | if (sdulen) |
1536 | hlen += 2; | |
1537 | ||
47d1ec61 | 1538 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1539 | hlen += 2; |
1540 | ||
1c2acffb GP |
1541 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1542 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1543 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1544 | if (!skb) | |
0175d629 | 1545 | return ERR_PTR(err); |
1c2acffb GP |
1546 | |
1547 | /* Create L2CAP header */ | |
1548 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1549 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1550 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1551 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1552 | if (sdulen) |
1553 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1554 | |
1555 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1556 | if (unlikely(err < 0)) { | |
1557 | kfree_skb(skb); | |
1558 | return ERR_PTR(err); | |
1559 | } | |
e90bac06 | 1560 | |
47d1ec61 | 1561 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1562 | put_unaligned_le16(0, skb_put(skb, 2)); |
1563 | ||
e90bac06 | 1564 | bt_cb(skb)->retries = 0; |
1c2acffb | 1565 | return skb; |
1da177e4 LT |
1566 | } |
1567 | ||
2c03a7a4 | 1568 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1569 | { |
c74e560c GP |
1570 | struct sk_buff *skb; |
1571 | struct sk_buff_head sar_queue; | |
1572 | u16 control; | |
1573 | size_t size = 0; | |
1574 | ||
ff12fd64 | 1575 | skb_queue_head_init(&sar_queue); |
c74e560c | 1576 | control = L2CAP_SDU_START; |
47d1ec61 | 1577 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1578 | if (IS_ERR(skb)) |
1579 | return PTR_ERR(skb); | |
1580 | ||
1581 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1582 | len -= chan->remote_mps; |
1583 | size += chan->remote_mps; | |
c74e560c GP |
1584 | |
1585 | while (len > 0) { | |
1586 | size_t buflen; | |
1587 | ||
2c03a7a4 | 1588 | if (len > chan->remote_mps) { |
44651b85 | 1589 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1590 | buflen = chan->remote_mps; |
c74e560c | 1591 | } else { |
44651b85 | 1592 | control = L2CAP_SDU_END; |
c74e560c GP |
1593 | buflen = len; |
1594 | } | |
1595 | ||
47d1ec61 | 1596 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1597 | if (IS_ERR(skb)) { |
1598 | skb_queue_purge(&sar_queue); | |
1599 | return PTR_ERR(skb); | |
1600 | } | |
1601 | ||
1602 | __skb_queue_tail(&sar_queue, skb); | |
1603 | len -= buflen; | |
1604 | size += buflen; | |
c74e560c | 1605 | } |
58d35f87 GP |
1606 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1607 | if (chan->tx_send_head == NULL) | |
1608 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1609 | |
1610 | return size; | |
1611 | } | |
1612 | ||
9a91a04a GP |
1613 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1614 | { | |
9a91a04a GP |
1615 | struct sk_buff *skb; |
1616 | u16 control; | |
1617 | int err; | |
1618 | ||
1619 | /* Connectionless channel */ | |
715ec005 | 1620 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
9a91a04a GP |
1621 | skb = l2cap_create_connless_pdu(chan, msg, len); |
1622 | if (IS_ERR(skb)) | |
1623 | return PTR_ERR(skb); | |
1624 | ||
1625 | l2cap_do_send(chan, skb); | |
1626 | return len; | |
1627 | } | |
1628 | ||
1629 | switch (chan->mode) { | |
1630 | case L2CAP_MODE_BASIC: | |
1631 | /* Check outgoing MTU */ | |
1632 | if (len > chan->omtu) | |
1633 | return -EMSGSIZE; | |
1634 | ||
1635 | /* Create a basic PDU */ | |
1636 | skb = l2cap_create_basic_pdu(chan, msg, len); | |
1637 | if (IS_ERR(skb)) | |
1638 | return PTR_ERR(skb); | |
1639 | ||
1640 | l2cap_do_send(chan, skb); | |
1641 | err = len; | |
1642 | break; | |
1643 | ||
1644 | case L2CAP_MODE_ERTM: | |
1645 | case L2CAP_MODE_STREAMING: | |
1646 | /* Entire SDU fits into one PDU */ | |
1647 | if (len <= chan->remote_mps) { | |
1648 | control = L2CAP_SDU_UNSEGMENTED; | |
1649 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, | |
1650 | 0); | |
1651 | if (IS_ERR(skb)) | |
1652 | return PTR_ERR(skb); | |
1653 | ||
1654 | __skb_queue_tail(&chan->tx_q, skb); | |
1655 | ||
1656 | if (chan->tx_send_head == NULL) | |
1657 | chan->tx_send_head = skb; | |
1658 | ||
1659 | } else { | |
1660 | /* Segment SDU into multiples PDUs */ | |
1661 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1662 | if (err < 0) | |
1663 | return err; | |
1664 | } | |
1665 | ||
1666 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1667 | l2cap_streaming_send(chan); | |
1668 | err = len; | |
1669 | break; | |
1670 | } | |
1671 | ||
e2ab4353 GP |
1672 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1673 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1674 | err = len; |
1675 | break; | |
1676 | } | |
1677 | ||
1678 | err = l2cap_ertm_send(chan); | |
1679 | if (err >= 0) | |
1680 | err = len; | |
1681 | ||
1682 | break; | |
1683 | ||
1684 | default: | |
1685 | BT_DBG("bad state %1.1x", chan->mode); | |
1686 | err = -EBADFD; | |
1687 | } | |
1688 | ||
1689 | return err; | |
1690 | } | |
1691 | ||
1da177e4 LT |
1692 | /* Copy frame to all raw sockets on that connection */ |
1693 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1694 | { | |
1da177e4 | 1695 | struct sk_buff *nskb; |
48454079 | 1696 | struct l2cap_chan *chan; |
1da177e4 LT |
1697 | |
1698 | BT_DBG("conn %p", conn); | |
1699 | ||
baa7e1fa GP |
1700 | read_lock(&conn->chan_lock); |
1701 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1702 | struct sock *sk = chan->sk; |
715ec005 | 1703 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1704 | continue; |
1705 | ||
1706 | /* Don't send frame to the socket it came from */ | |
1707 | if (skb->sk == sk) | |
1708 | continue; | |
af05b30b GP |
1709 | nskb = skb_clone(skb, GFP_ATOMIC); |
1710 | if (!nskb) | |
1da177e4 LT |
1711 | continue; |
1712 | ||
23070494 | 1713 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1714 | kfree_skb(nskb); |
1715 | } | |
baa7e1fa | 1716 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1717 | } |
1718 | ||
1719 | /* ---- L2CAP signalling commands ---- */ | |
1720 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1721 | u8 code, u8 ident, u16 dlen, void *data) | |
1722 | { | |
1723 | struct sk_buff *skb, **frag; | |
1724 | struct l2cap_cmd_hdr *cmd; | |
1725 | struct l2cap_hdr *lh; | |
1726 | int len, count; | |
1727 | ||
af05b30b GP |
1728 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1729 | conn, code, ident, dlen); | |
1da177e4 LT |
1730 | |
1731 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1732 | count = min_t(unsigned int, conn->mtu, len); | |
1733 | ||
1734 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1735 | if (!skb) | |
1736 | return NULL; | |
1737 | ||
1738 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1739 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1740 | |
1741 | if (conn->hcon->type == LE_LINK) | |
1742 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1743 | else | |
1744 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1745 | |
1746 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1747 | cmd->code = code; | |
1748 | cmd->ident = ident; | |
aca3192c | 1749 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1750 | |
1751 | if (dlen) { | |
1752 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1753 | memcpy(skb_put(skb, count), data, count); | |
1754 | data += count; | |
1755 | } | |
1756 | ||
1757 | len -= skb->len; | |
1758 | ||
1759 | /* Continuation fragments (no L2CAP header) */ | |
1760 | frag = &skb_shinfo(skb)->frag_list; | |
1761 | while (len) { | |
1762 | count = min_t(unsigned int, conn->mtu, len); | |
1763 | ||
1764 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1765 | if (!*frag) | |
1766 | goto fail; | |
1767 | ||
1768 | memcpy(skb_put(*frag, count), data, count); | |
1769 | ||
1770 | len -= count; | |
1771 | data += count; | |
1772 | ||
1773 | frag = &(*frag)->next; | |
1774 | } | |
1775 | ||
1776 | return skb; | |
1777 | ||
1778 | fail: | |
1779 | kfree_skb(skb); | |
1780 | return NULL; | |
1781 | } | |
1782 | ||
1783 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1784 | { | |
1785 | struct l2cap_conf_opt *opt = *ptr; | |
1786 | int len; | |
1787 | ||
1788 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1789 | *ptr += len; | |
1790 | ||
1791 | *type = opt->type; | |
1792 | *olen = opt->len; | |
1793 | ||
1794 | switch (opt->len) { | |
1795 | case 1: | |
1796 | *val = *((u8 *) opt->val); | |
1797 | break; | |
1798 | ||
1799 | case 2: | |
bfaaeb3e | 1800 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1801 | break; |
1802 | ||
1803 | case 4: | |
bfaaeb3e | 1804 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1805 | break; |
1806 | ||
1807 | default: | |
1808 | *val = (unsigned long) opt->val; | |
1809 | break; | |
1810 | } | |
1811 | ||
1812 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1813 | return len; | |
1814 | } | |
1815 | ||
1da177e4 LT |
1816 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1817 | { | |
1818 | struct l2cap_conf_opt *opt = *ptr; | |
1819 | ||
1820 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1821 | ||
1822 | opt->type = type; | |
1823 | opt->len = len; | |
1824 | ||
1825 | switch (len) { | |
1826 | case 1: | |
1827 | *((u8 *) opt->val) = val; | |
1828 | break; | |
1829 | ||
1830 | case 2: | |
4f8b691c | 1831 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1832 | break; |
1833 | ||
1834 | case 4: | |
4f8b691c | 1835 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1836 | break; |
1837 | ||
1838 | default: | |
1839 | memcpy(opt->val, (void *) val, len); | |
1840 | break; | |
1841 | } | |
1842 | ||
1843 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1844 | } | |
1845 | ||
c1b4f43b GP |
1846 | static void l2cap_ack_timeout(unsigned long arg) |
1847 | { | |
525cd185 | 1848 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1849 | |
525cd185 GP |
1850 | bh_lock_sock(chan->sk); |
1851 | l2cap_send_ack(chan); | |
1852 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1853 | } |
1854 | ||
525cd185 | 1855 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1856 | { |
525cd185 GP |
1857 | struct sock *sk = chan->sk; |
1858 | ||
42e5c802 | 1859 | chan->expected_ack_seq = 0; |
6a026610 | 1860 | chan->unacked_frames = 0; |
42e5c802 | 1861 | chan->buffer_seq = 0; |
6a026610 GP |
1862 | chan->num_acked = 0; |
1863 | chan->frames_sent = 0; | |
0565c1c2 | 1864 | |
e92c8e70 GP |
1865 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1866 | (unsigned long) chan); | |
1867 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1868 | (unsigned long) chan); | |
1869 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1870 | |
f1c6775b | 1871 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 1872 | |
39d5a3ee GP |
1873 | INIT_LIST_HEAD(&chan->srej_l); |
1874 | ||
218bb9df GP |
1875 | |
1876 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1877 | } |
1878 | ||
f2fcfcd6 GP |
1879 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1880 | { | |
1881 | switch (mode) { | |
1882 | case L2CAP_MODE_STREAMING: | |
1883 | case L2CAP_MODE_ERTM: | |
1884 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1885 | return mode; | |
1886 | /* fall through */ | |
1887 | default: | |
1888 | return L2CAP_MODE_BASIC; | |
1889 | } | |
1890 | } | |
1891 | ||
710f9b0a | 1892 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1893 | { |
1da177e4 | 1894 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1895 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1896 | void *ptr = req->data; |
1897 | ||
49208c9c | 1898 | BT_DBG("chan %p", chan); |
1da177e4 | 1899 | |
73ffa904 | 1900 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1901 | goto done; |
1902 | ||
0c1bc5c6 | 1903 | switch (chan->mode) { |
f2fcfcd6 GP |
1904 | case L2CAP_MODE_STREAMING: |
1905 | case L2CAP_MODE_ERTM: | |
c1360a1c | 1906 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 1907 | break; |
85eb53c6 | 1908 | |
2ba13ed6 | 1909 | /* fall through */ |
f2fcfcd6 | 1910 | default: |
8c1d787b | 1911 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
1912 | break; |
1913 | } | |
1914 | ||
1915 | done: | |
0c1bc5c6 GP |
1916 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1917 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1918 | |
0c1bc5c6 | 1919 | switch (chan->mode) { |
65c7c491 | 1920 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
1921 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1922 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
1923 | break; |
1924 | ||
62547752 GP |
1925 | rfc.mode = L2CAP_MODE_BASIC; |
1926 | rfc.txwin_size = 0; | |
1927 | rfc.max_transmit = 0; | |
1928 | rfc.retrans_timeout = 0; | |
1929 | rfc.monitor_timeout = 0; | |
1930 | rfc.max_pdu_size = 0; | |
1931 | ||
63406504 GP |
1932 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1933 | (unsigned long) &rfc); | |
65c7c491 MH |
1934 | break; |
1935 | ||
1936 | case L2CAP_MODE_ERTM: | |
1937 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 GP |
1938 | rfc.txwin_size = chan->tx_win; |
1939 | rfc.max_transmit = chan->max_tx; | |
f2fcfcd6 GP |
1940 | rfc.retrans_timeout = 0; |
1941 | rfc.monitor_timeout = 0; | |
c74e560c | 1942 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1943 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1944 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
f2fcfcd6 | 1945 | |
63406504 GP |
1946 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1947 | (unsigned long) &rfc); | |
1948 | ||
8c1d787b | 1949 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1950 | break; |
1951 | ||
47d1ec61 | 1952 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 1953 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
1954 | chan->fcs = L2CAP_FCS_NONE; |
1955 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1956 | } |
f2fcfcd6 GP |
1957 | break; |
1958 | ||
1959 | case L2CAP_MODE_STREAMING: | |
1960 | rfc.mode = L2CAP_MODE_STREAMING; | |
1961 | rfc.txwin_size = 0; | |
1962 | rfc.max_transmit = 0; | |
1963 | rfc.retrans_timeout = 0; | |
1964 | rfc.monitor_timeout = 0; | |
c74e560c | 1965 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1966 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1967 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
65c7c491 | 1968 | |
63406504 GP |
1969 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1970 | (unsigned long) &rfc); | |
1971 | ||
8c1d787b | 1972 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1973 | break; |
1974 | ||
47d1ec61 | 1975 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 1976 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
1977 | chan->fcs = L2CAP_FCS_NONE; |
1978 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1979 | } |
65c7c491 MH |
1980 | break; |
1981 | } | |
1da177e4 | 1982 | |
fe4128e0 | 1983 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 1984 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
1985 | |
1986 | return ptr - data; | |
1987 | } | |
1988 | ||
73ffa904 | 1989 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1990 | { |
5dee9e7c MH |
1991 | struct l2cap_conf_rsp *rsp = data; |
1992 | void *ptr = rsp->data; | |
73ffa904 GP |
1993 | void *req = chan->conf_req; |
1994 | int len = chan->conf_len; | |
5dee9e7c MH |
1995 | int type, hint, olen; |
1996 | unsigned long val; | |
6464f35f | 1997 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1998 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1999 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2000 | |
73ffa904 | 2001 | BT_DBG("chan %p", chan); |
820ae1b8 | 2002 | |
5dee9e7c MH |
2003 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2004 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2005 | |
589d2746 | 2006 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2007 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2008 | |
2009 | switch (type) { | |
2010 | case L2CAP_CONF_MTU: | |
861d6882 | 2011 | mtu = val; |
5dee9e7c MH |
2012 | break; |
2013 | ||
2014 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2015 | chan->flush_to = val; |
5dee9e7c MH |
2016 | break; |
2017 | ||
2018 | case L2CAP_CONF_QOS: | |
2019 | break; | |
2020 | ||
6464f35f MH |
2021 | case L2CAP_CONF_RFC: |
2022 | if (olen == sizeof(rfc)) | |
2023 | memcpy(&rfc, (void *) val, olen); | |
2024 | break; | |
2025 | ||
fcc203c3 GP |
2026 | case L2CAP_CONF_FCS: |
2027 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2028 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
fcc203c3 GP |
2029 | |
2030 | break; | |
2031 | ||
5dee9e7c MH |
2032 | default: |
2033 | if (hint) | |
2034 | break; | |
2035 | ||
2036 | result = L2CAP_CONF_UNKNOWN; | |
2037 | *((u8 *) ptr++) = type; | |
2038 | break; | |
2039 | } | |
2040 | } | |
2041 | ||
73ffa904 | 2042 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2043 | goto done; |
2044 | ||
0c1bc5c6 | 2045 | switch (chan->mode) { |
f2fcfcd6 GP |
2046 | case L2CAP_MODE_STREAMING: |
2047 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2048 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2049 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2050 | chan->conn->feat_mask); |
85eb53c6 GP |
2051 | break; |
2052 | } | |
2053 | ||
0c1bc5c6 | 2054 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2055 | return -ECONNREFUSED; |
742e519b | 2056 | |
f2fcfcd6 | 2057 | break; |
f2fcfcd6 GP |
2058 | } |
2059 | ||
2060 | done: | |
0c1bc5c6 | 2061 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2062 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2063 | rfc.mode = chan->mode; |
f2fcfcd6 | 2064 | |
73ffa904 | 2065 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2066 | return -ECONNREFUSED; |
2067 | ||
2068 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2069 | sizeof(rfc), (unsigned long) &rfc); | |
2070 | } | |
2071 | ||
2072 | ||
5dee9e7c MH |
2073 | if (result == L2CAP_CONF_SUCCESS) { |
2074 | /* Configure output options and let the other side know | |
2075 | * which ones we don't like. */ | |
2076 | ||
f2fcfcd6 GP |
2077 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2078 | result = L2CAP_CONF_UNACCEPT; | |
2079 | else { | |
0c1bc5c6 | 2080 | chan->omtu = mtu; |
c1360a1c | 2081 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2082 | } |
0c1bc5c6 | 2083 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2084 | |
f2fcfcd6 GP |
2085 | switch (rfc.mode) { |
2086 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2087 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2088 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2089 | break; |
2090 | ||
2091 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
2092 | chan->remote_tx_win = rfc.txwin_size; |
2093 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 | 2094 | |
8c1d787b GP |
2095 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2096 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2097 | |
2c03a7a4 | 2098 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2099 | |
10467e9e GP |
2100 | rfc.retrans_timeout = |
2101 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2102 | rfc.monitor_timeout = | |
2103 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2104 | |
c1360a1c | 2105 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2106 | |
2107 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2108 | sizeof(rfc), (unsigned long) &rfc); | |
2109 | ||
f2fcfcd6 GP |
2110 | break; |
2111 | ||
2112 | case L2CAP_MODE_STREAMING: | |
8c1d787b GP |
2113 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
2114 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 2115 | |
2c03a7a4 | 2116 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 2117 | |
c1360a1c | 2118 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2119 | |
2120 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2121 | sizeof(rfc), (unsigned long) &rfc); | |
2122 | ||
f2fcfcd6 GP |
2123 | break; |
2124 | ||
2125 | default: | |
5dee9e7c | 2126 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2127 | |
6464f35f | 2128 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2129 | rfc.mode = chan->mode; |
f2fcfcd6 | 2130 | } |
6464f35f | 2131 | |
f2fcfcd6 | 2132 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2133 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2134 | } |
fe4128e0 | 2135 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2136 | rsp->result = cpu_to_le16(result); |
2137 | rsp->flags = cpu_to_le16(0x0000); | |
2138 | ||
2139 | return ptr - data; | |
1da177e4 LT |
2140 | } |
2141 | ||
b4450035 | 2142 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2143 | { |
f2fcfcd6 GP |
2144 | struct l2cap_conf_req *req = data; |
2145 | void *ptr = req->data; | |
2146 | int type, olen; | |
2147 | unsigned long val; | |
2148 | struct l2cap_conf_rfc rfc; | |
2149 | ||
fe4128e0 | 2150 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2151 | |
2152 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2153 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2154 | ||
2155 | switch (type) { | |
2156 | case L2CAP_CONF_MTU: | |
2157 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2158 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2159 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2160 | } else |
0c1bc5c6 GP |
2161 | chan->imtu = val; |
2162 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2163 | break; |
2164 | ||
2165 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2166 | chan->flush_to = val; |
f2fcfcd6 | 2167 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2168 | 2, chan->flush_to); |
f2fcfcd6 GP |
2169 | break; |
2170 | ||
2171 | case L2CAP_CONF_RFC: | |
2172 | if (olen == sizeof(rfc)) | |
2173 | memcpy(&rfc, (void *)val, olen); | |
2174 | ||
c1360a1c | 2175 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2176 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2177 | return -ECONNREFUSED; |
2178 | ||
47d1ec61 | 2179 | chan->fcs = 0; |
f2fcfcd6 GP |
2180 | |
2181 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2182 | sizeof(rfc), (unsigned long) &rfc); | |
2183 | break; | |
2184 | } | |
2185 | } | |
2186 | ||
0c1bc5c6 | 2187 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2188 | return -ECONNREFUSED; |
2189 | ||
0c1bc5c6 | 2190 | chan->mode = rfc.mode; |
6c2ea7a8 | 2191 | |
f2fcfcd6 GP |
2192 | if (*result == L2CAP_CONF_SUCCESS) { |
2193 | switch (rfc.mode) { | |
2194 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2195 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2196 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2197 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2198 | break; |
2199 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2200 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2201 | } |
2202 | } | |
2203 | ||
fe4128e0 | 2204 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2205 | req->flags = cpu_to_le16(0x0000); |
2206 | ||
2207 | return ptr - data; | |
2208 | } | |
2209 | ||
fe4128e0 | 2210 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2211 | { |
2212 | struct l2cap_conf_rsp *rsp = data; | |
2213 | void *ptr = rsp->data; | |
1da177e4 | 2214 | |
fe4128e0 | 2215 | BT_DBG("chan %p", chan); |
1da177e4 | 2216 | |
fe4128e0 | 2217 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2218 | rsp->result = cpu_to_le16(result); |
aca3192c | 2219 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2220 | |
2221 | return ptr - data; | |
2222 | } | |
2223 | ||
8c1d787b | 2224 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2225 | { |
2226 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2227 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2228 | u8 buf[128]; |
2229 | ||
fe4128e0 GP |
2230 | rsp.scid = cpu_to_le16(chan->dcid); |
2231 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2232 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2233 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2234 | l2cap_send_cmd(conn, chan->ident, | |
2235 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2236 | ||
c1360a1c | 2237 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2238 | return; |
2239 | ||
710f9b0a GP |
2240 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2241 | l2cap_build_conf_req(chan, buf), buf); | |
2242 | chan->num_conf_req++; | |
2243 | } | |
2244 | ||
47d1ec61 | 2245 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2246 | { |
7b1c0049 GP |
2247 | int type, olen; |
2248 | unsigned long val; | |
2249 | struct l2cap_conf_rfc rfc; | |
2250 | ||
47d1ec61 | 2251 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2252 | |
0c1bc5c6 | 2253 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2254 | return; |
2255 | ||
2256 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2257 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2258 | ||
2259 | switch (type) { | |
2260 | case L2CAP_CONF_RFC: | |
2261 | if (olen == sizeof(rfc)) | |
2262 | memcpy(&rfc, (void *)val, olen); | |
2263 | goto done; | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | done: | |
2268 | switch (rfc.mode) { | |
2269 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2270 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2271 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2272 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2273 | break; |
2274 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2275 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2276 | } |
2277 | } | |
2278 | ||
4e8402a3 MH |
2279 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2280 | { | |
e2fd318e | 2281 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2282 | |
e2fd318e | 2283 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2284 | return 0; |
2285 | ||
2286 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2287 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2288 | del_timer(&conn->info_timer); |
984947dc MH |
2289 | |
2290 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2291 | conn->info_ident = 0; |
984947dc | 2292 | |
4e8402a3 MH |
2293 | l2cap_conn_start(conn); |
2294 | } | |
2295 | ||
2296 | return 0; | |
2297 | } | |
2298 | ||
1da177e4 LT |
2299 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2300 | { | |
1da177e4 LT |
2301 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2302 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2303 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2304 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2305 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2306 | |
2307 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2308 | __le16 psm = req->psm; |
1da177e4 LT |
2309 | |
2310 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2311 | ||
2312 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2313 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2314 | if (!pchan) { | |
1da177e4 LT |
2315 | result = L2CAP_CR_BAD_PSM; |
2316 | goto sendresp; | |
2317 | } | |
2318 | ||
23691d75 GP |
2319 | parent = pchan->sk; |
2320 | ||
e0f0cb56 GP |
2321 | bh_lock_sock(parent); |
2322 | ||
e7c29cb1 MH |
2323 | /* Check if the ACL is secure enough (if not SDP) */ |
2324 | if (psm != cpu_to_le16(0x0001) && | |
2325 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2326 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2327 | result = L2CAP_CR_SEC_BLOCK; |
2328 | goto response; | |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | result = L2CAP_CR_NO_MEM; |
2332 | ||
2333 | /* Check for backlog size */ | |
2334 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2335 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2336 | goto response; |
2337 | } | |
2338 | ||
80808e43 GP |
2339 | chan = pchan->ops->new_connection(pchan->data); |
2340 | if (!chan) | |
1da177e4 LT |
2341 | goto response; |
2342 | ||
80808e43 GP |
2343 | sk = chan->sk; |
2344 | ||
baa7e1fa | 2345 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2346 | |
2347 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2348 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2349 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2350 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2351 | chan->ops->close(chan->data); |
1da177e4 LT |
2352 | goto response; |
2353 | } | |
2354 | ||
2355 | hci_conn_hold(conn->hcon); | |
2356 | ||
1da177e4 LT |
2357 | bacpy(&bt_sk(sk)->src, conn->src); |
2358 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2359 | chan->psm = psm; |
2360 | chan->dcid = scid; | |
1da177e4 | 2361 | |
d1010240 GP |
2362 | bt_accept_enqueue(parent, sk); |
2363 | ||
48454079 GP |
2364 | __l2cap_chan_add(conn, chan); |
2365 | ||
fe4128e0 | 2366 | dcid = chan->scid; |
1da177e4 | 2367 | |
c9b66675 | 2368 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2369 | |
fc7f8a7e | 2370 | chan->ident = cmd->ident; |
1da177e4 | 2371 | |
984947dc | 2372 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2373 | if (l2cap_check_security(chan)) { |
f66dc81f | 2374 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2375 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2376 | result = L2CAP_CR_PEND; |
2377 | status = L2CAP_CS_AUTHOR_PEND; | |
2378 | parent->sk_data_ready(parent, 0); | |
2379 | } else { | |
89bc500e | 2380 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2381 | result = L2CAP_CR_SUCCESS; |
2382 | status = L2CAP_CS_NO_INFO; | |
2383 | } | |
79d554a6 | 2384 | } else { |
89bc500e | 2385 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2386 | result = L2CAP_CR_PEND; |
2387 | status = L2CAP_CS_AUTHEN_PEND; | |
2388 | } | |
2389 | } else { | |
89bc500e | 2390 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2391 | result = L2CAP_CR_PEND; |
2392 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2393 | } |
2394 | ||
baa7e1fa | 2395 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2396 | |
2397 | response: | |
2398 | bh_unlock_sock(parent); | |
2399 | ||
2400 | sendresp: | |
aca3192c YH |
2401 | rsp.scid = cpu_to_le16(scid); |
2402 | rsp.dcid = cpu_to_le16(dcid); | |
2403 | rsp.result = cpu_to_le16(result); | |
2404 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2405 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2406 | |
2407 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2408 | struct l2cap_info_req info; | |
2409 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2410 | ||
2411 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2412 | conn->info_ident = l2cap_get_ident(conn); | |
2413 | ||
2414 | mod_timer(&conn->info_timer, jiffies + | |
2415 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2416 | ||
2417 | l2cap_send_cmd(conn, conn->info_ident, | |
2418 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2419 | } | |
2420 | ||
c1360a1c | 2421 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2422 | result == L2CAP_CR_SUCCESS) { |
2423 | u8 buf[128]; | |
c1360a1c | 2424 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2425 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2426 | l2cap_build_conf_req(chan, buf), buf); |
2427 | chan->num_conf_req++; | |
e9aeb2dd GP |
2428 | } |
2429 | ||
1da177e4 LT |
2430 | return 0; |
2431 | } | |
2432 | ||
2433 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2434 | { | |
2435 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2436 | u16 scid, dcid, result, status; | |
48454079 | 2437 | struct l2cap_chan *chan; |
1da177e4 LT |
2438 | struct sock *sk; |
2439 | u8 req[128]; | |
2440 | ||
2441 | scid = __le16_to_cpu(rsp->scid); | |
2442 | dcid = __le16_to_cpu(rsp->dcid); | |
2443 | result = __le16_to_cpu(rsp->result); | |
2444 | status = __le16_to_cpu(rsp->status); | |
2445 | ||
2446 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2447 | ||
2448 | if (scid) { | |
baa7e1fa | 2449 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2450 | if (!chan) |
57d3b22b | 2451 | return -EFAULT; |
1da177e4 | 2452 | } else { |
baa7e1fa | 2453 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2454 | if (!chan) |
57d3b22b | 2455 | return -EFAULT; |
1da177e4 LT |
2456 | } |
2457 | ||
48454079 GP |
2458 | sk = chan->sk; |
2459 | ||
1da177e4 LT |
2460 | switch (result) { |
2461 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2462 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2463 | chan->ident = 0; |
fe4128e0 | 2464 | chan->dcid = dcid; |
c1360a1c | 2465 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2466 | |
c1360a1c | 2467 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2468 | break; |
2469 | ||
1da177e4 | 2470 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2471 | l2cap_build_conf_req(chan, req), req); |
2472 | chan->num_conf_req++; | |
1da177e4 LT |
2473 | break; |
2474 | ||
2475 | case L2CAP_CR_PEND: | |
c1360a1c | 2476 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2477 | break; |
2478 | ||
2479 | default: | |
a49184c2 AE |
2480 | /* don't delete l2cap channel if sk is owned by user */ |
2481 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2482 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2483 | __clear_chan_timer(chan); |
2484 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2485 | break; |
2486 | } | |
2487 | ||
48454079 | 2488 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2489 | break; |
2490 | } | |
2491 | ||
2492 | bh_unlock_sock(sk); | |
2493 | return 0; | |
2494 | } | |
2495 | ||
47d1ec61 | 2496 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2497 | { |
2498 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2499 | * sides request it. | |
2500 | */ | |
0c1bc5c6 | 2501 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2502 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2503 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2504 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2505 | } |
2506 | ||
88219a0f | 2507 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2508 | { |
2509 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2510 | u16 dcid, flags; | |
2511 | u8 rsp[64]; | |
48454079 | 2512 | struct l2cap_chan *chan; |
1da177e4 | 2513 | struct sock *sk; |
5dee9e7c | 2514 | int len; |
1da177e4 LT |
2515 | |
2516 | dcid = __le16_to_cpu(req->dcid); | |
2517 | flags = __le16_to_cpu(req->flags); | |
2518 | ||
2519 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2520 | ||
baa7e1fa | 2521 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2522 | if (!chan) |
1da177e4 LT |
2523 | return -ENOENT; |
2524 | ||
48454079 GP |
2525 | sk = chan->sk; |
2526 | ||
033b1142 | 2527 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2528 | struct l2cap_cmd_rej_cid rej; |
2529 | ||
2530 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2531 | rej.scid = cpu_to_le16(chan->scid); | |
2532 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2533 | |
df6bd743 GP |
2534 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2535 | sizeof(rej), &rej); | |
354f60a9 | 2536 | goto unlock; |
df6bd743 | 2537 | } |
354f60a9 | 2538 | |
5dee9e7c | 2539 | /* Reject if config buffer is too small. */ |
88219a0f | 2540 | len = cmd_len - sizeof(*req); |
7ac28817 | 2541 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2542 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2543 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2544 | L2CAP_CONF_REJECT, flags), rsp); |
2545 | goto unlock; | |
2546 | } | |
2547 | ||
2548 | /* Store config. */ | |
73ffa904 GP |
2549 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2550 | chan->conf_len += len; | |
1da177e4 LT |
2551 | |
2552 | if (flags & 0x0001) { | |
2553 | /* Incomplete config. Send empty response. */ | |
2554 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2555 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2556 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2557 | goto unlock; |
2558 | } | |
2559 | ||
2560 | /* Complete config. */ | |
73ffa904 | 2561 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2562 | if (len < 0) { |
e92c8e70 | 2563 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2564 | goto unlock; |
f2fcfcd6 | 2565 | } |
1da177e4 | 2566 | |
5dee9e7c | 2567 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2568 | chan->num_conf_rsp++; |
5dee9e7c | 2569 | |
5dee9e7c | 2570 | /* Reset config buffer. */ |
73ffa904 | 2571 | chan->conf_len = 0; |
5dee9e7c | 2572 | |
c1360a1c | 2573 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2574 | goto unlock; |
2575 | ||
c1360a1c | 2576 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2577 | set_default_fcs(chan); |
fcc203c3 | 2578 | |
89bc500e | 2579 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2580 | |
42e5c802 GP |
2581 | chan->next_tx_seq = 0; |
2582 | chan->expected_tx_seq = 0; | |
58d35f87 | 2583 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2584 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2585 | l2cap_ertm_init(chan); |
0565c1c2 | 2586 | |
1da177e4 | 2587 | l2cap_chan_ready(sk); |
876d9484 MH |
2588 | goto unlock; |
2589 | } | |
2590 | ||
c1360a1c | 2591 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2592 | u8 buf[64]; |
1da177e4 | 2593 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2594 | l2cap_build_conf_req(chan, buf), buf); |
2595 | chan->num_conf_req++; | |
1da177e4 LT |
2596 | } |
2597 | ||
2598 | unlock: | |
2599 | bh_unlock_sock(sk); | |
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2604 | { | |
2605 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2606 | u16 scid, flags, result; | |
48454079 | 2607 | struct l2cap_chan *chan; |
1da177e4 | 2608 | struct sock *sk; |
7b1c0049 | 2609 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2610 | |
2611 | scid = __le16_to_cpu(rsp->scid); | |
2612 | flags = __le16_to_cpu(rsp->flags); | |
2613 | result = __le16_to_cpu(rsp->result); | |
2614 | ||
af05b30b GP |
2615 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2616 | scid, flags, result); | |
1da177e4 | 2617 | |
baa7e1fa | 2618 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2619 | if (!chan) |
1da177e4 LT |
2620 | return 0; |
2621 | ||
48454079 GP |
2622 | sk = chan->sk; |
2623 | ||
1da177e4 LT |
2624 | switch (result) { |
2625 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2626 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2627 | break; |
2628 | ||
2629 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2630 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2631 | char req[64]; |
2632 | ||
c2c77ec8 | 2633 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2634 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2635 | goto done; |
2636 | } | |
2637 | ||
f2fcfcd6 GP |
2638 | /* throw out any old stored conf requests */ |
2639 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2640 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2641 | req, &result); | |
f2fcfcd6 | 2642 | if (len < 0) { |
e92c8e70 | 2643 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2644 | goto done; |
2645 | } | |
2646 | ||
2647 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2648 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2649 | chan->num_conf_req++; |
f2fcfcd6 GP |
2650 | if (result != L2CAP_CONF_SUCCESS) |
2651 | goto done; | |
2652 | break; | |
1da177e4 LT |
2653 | } |
2654 | ||
8e87d142 | 2655 | default: |
b1235d79 | 2656 | sk->sk_err = ECONNRESET; |
c9b66675 | 2657 | __set_chan_timer(chan, HZ * 5); |
e92c8e70 | 2658 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2659 | goto done; |
2660 | } | |
2661 | ||
2662 | if (flags & 0x01) | |
2663 | goto done; | |
2664 | ||
c1360a1c | 2665 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2666 | |
c1360a1c | 2667 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2668 | set_default_fcs(chan); |
fcc203c3 | 2669 | |
89bc500e | 2670 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2671 | chan->next_tx_seq = 0; |
2672 | chan->expected_tx_seq = 0; | |
58d35f87 | 2673 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2674 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2675 | l2cap_ertm_init(chan); |
0565c1c2 | 2676 | |
1da177e4 LT |
2677 | l2cap_chan_ready(sk); |
2678 | } | |
2679 | ||
2680 | done: | |
2681 | bh_unlock_sock(sk); | |
2682 | return 0; | |
2683 | } | |
2684 | ||
2685 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2686 | { | |
2687 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2688 | struct l2cap_disconn_rsp rsp; | |
2689 | u16 dcid, scid; | |
48454079 | 2690 | struct l2cap_chan *chan; |
1da177e4 LT |
2691 | struct sock *sk; |
2692 | ||
2693 | scid = __le16_to_cpu(req->scid); | |
2694 | dcid = __le16_to_cpu(req->dcid); | |
2695 | ||
2696 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2697 | ||
baa7e1fa | 2698 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2699 | if (!chan) |
1da177e4 LT |
2700 | return 0; |
2701 | ||
48454079 GP |
2702 | sk = chan->sk; |
2703 | ||
fe4128e0 GP |
2704 | rsp.dcid = cpu_to_le16(chan->scid); |
2705 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2706 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2707 | ||
2708 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2709 | ||
a49184c2 AE |
2710 | /* don't delete l2cap channel if sk is owned by user */ |
2711 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2712 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2713 | __clear_chan_timer(chan); |
2714 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2715 | bh_unlock_sock(sk); |
2716 | return 0; | |
2717 | } | |
2718 | ||
48454079 | 2719 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2720 | bh_unlock_sock(sk); |
2721 | ||
ba3bd0ee | 2722 | chan->ops->close(chan->data); |
1da177e4 LT |
2723 | return 0; |
2724 | } | |
2725 | ||
2726 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2727 | { | |
2728 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2729 | u16 dcid, scid; | |
48454079 | 2730 | struct l2cap_chan *chan; |
1da177e4 LT |
2731 | struct sock *sk; |
2732 | ||
2733 | scid = __le16_to_cpu(rsp->scid); | |
2734 | dcid = __le16_to_cpu(rsp->dcid); | |
2735 | ||
2736 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2737 | ||
baa7e1fa | 2738 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2739 | if (!chan) |
1da177e4 LT |
2740 | return 0; |
2741 | ||
48454079 GP |
2742 | sk = chan->sk; |
2743 | ||
a49184c2 AE |
2744 | /* don't delete l2cap channel if sk is owned by user */ |
2745 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2746 | l2cap_state_change(chan,BT_DISCONN); |
c9b66675 GP |
2747 | __clear_chan_timer(chan); |
2748 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2749 | bh_unlock_sock(sk); |
2750 | return 0; | |
2751 | } | |
2752 | ||
48454079 | 2753 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2754 | bh_unlock_sock(sk); |
2755 | ||
ba3bd0ee | 2756 | chan->ops->close(chan->data); |
1da177e4 LT |
2757 | return 0; |
2758 | } | |
2759 | ||
2760 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2761 | { | |
2762 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2763 | u16 type; |
2764 | ||
2765 | type = __le16_to_cpu(req->type); | |
2766 | ||
2767 | BT_DBG("type 0x%4.4x", type); | |
2768 | ||
f0709e03 MH |
2769 | if (type == L2CAP_IT_FEAT_MASK) { |
2770 | u8 buf[8]; | |
44dd46de | 2771 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2772 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2773 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2774 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2775 | if (!disable_ertm) |
fcc203c3 GP |
2776 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2777 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2778 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2779 | l2cap_send_cmd(conn, cmd->ident, |
2780 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2781 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2782 | u8 buf[12]; | |
2783 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2784 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2785 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2786 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2787 | l2cap_send_cmd(conn, cmd->ident, | |
2788 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2789 | } else { |
2790 | struct l2cap_info_rsp rsp; | |
2791 | rsp.type = cpu_to_le16(type); | |
2792 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2793 | l2cap_send_cmd(conn, cmd->ident, | |
2794 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2795 | } | |
1da177e4 LT |
2796 | |
2797 | return 0; | |
2798 | } | |
2799 | ||
2800 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2801 | { | |
2802 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2803 | u16 type, result; | |
2804 | ||
2805 | type = __le16_to_cpu(rsp->type); | |
2806 | result = __le16_to_cpu(rsp->result); | |
2807 | ||
2808 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2809 | ||
e90165be AE |
2810 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2811 | if (cmd->ident != conn->info_ident || | |
2812 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2813 | return 0; | |
2814 | ||
4e8402a3 MH |
2815 | del_timer(&conn->info_timer); |
2816 | ||
adb08ede VT |
2817 | if (result != L2CAP_IR_SUCCESS) { |
2818 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2819 | conn->info_ident = 0; | |
2820 | ||
2821 | l2cap_conn_start(conn); | |
2822 | ||
2823 | return 0; | |
2824 | } | |
2825 | ||
984947dc | 2826 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2827 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2828 | |
47ec1dcd | 2829 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2830 | struct l2cap_info_req req; |
2831 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2832 | ||
2833 | conn->info_ident = l2cap_get_ident(conn); | |
2834 | ||
2835 | l2cap_send_cmd(conn, conn->info_ident, | |
2836 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2837 | } else { | |
2838 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2839 | conn->info_ident = 0; | |
2840 | ||
2841 | l2cap_conn_start(conn); | |
2842 | } | |
2843 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2844 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2845 | conn->info_ident = 0; |
984947dc MH |
2846 | |
2847 | l2cap_conn_start(conn); | |
2848 | } | |
4e8402a3 | 2849 | |
1da177e4 LT |
2850 | return 0; |
2851 | } | |
2852 | ||
e2174ca4 | 2853 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2854 | u16 to_multiplier) |
2855 | { | |
2856 | u16 max_latency; | |
2857 | ||
2858 | if (min > max || min < 6 || max > 3200) | |
2859 | return -EINVAL; | |
2860 | ||
2861 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2862 | return -EINVAL; | |
2863 | ||
2864 | if (max >= to_multiplier * 8) | |
2865 | return -EINVAL; | |
2866 | ||
2867 | max_latency = (to_multiplier * 8 / max) - 1; | |
2868 | if (latency > 499 || latency > max_latency) | |
2869 | return -EINVAL; | |
2870 | ||
2871 | return 0; | |
2872 | } | |
2873 | ||
2874 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2875 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2876 | { | |
2877 | struct hci_conn *hcon = conn->hcon; | |
2878 | struct l2cap_conn_param_update_req *req; | |
2879 | struct l2cap_conn_param_update_rsp rsp; | |
2880 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2881 | int err; |
de73115a CT |
2882 | |
2883 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2884 | return -EINVAL; | |
2885 | ||
2886 | cmd_len = __le16_to_cpu(cmd->len); | |
2887 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2888 | return -EPROTO; | |
2889 | ||
2890 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2891 | min = __le16_to_cpu(req->min); |
2892 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2893 | latency = __le16_to_cpu(req->latency); |
2894 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2895 | ||
2896 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2897 | min, max, latency, to_multiplier); | |
2898 | ||
2899 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2900 | |
2901 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2902 | if (err) | |
de73115a CT |
2903 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2904 | else | |
2905 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2906 | ||
2907 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2908 | sizeof(rsp), &rsp); | |
2909 | ||
2ce603eb CT |
2910 | if (!err) |
2911 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2912 | ||
de73115a CT |
2913 | return 0; |
2914 | } | |
2915 | ||
3300d9a9 CT |
2916 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2917 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2918 | { | |
2919 | int err = 0; | |
2920 | ||
2921 | switch (cmd->code) { | |
2922 | case L2CAP_COMMAND_REJ: | |
2923 | l2cap_command_rej(conn, cmd, data); | |
2924 | break; | |
2925 | ||
2926 | case L2CAP_CONN_REQ: | |
2927 | err = l2cap_connect_req(conn, cmd, data); | |
2928 | break; | |
2929 | ||
2930 | case L2CAP_CONN_RSP: | |
2931 | err = l2cap_connect_rsp(conn, cmd, data); | |
2932 | break; | |
2933 | ||
2934 | case L2CAP_CONF_REQ: | |
2935 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2936 | break; | |
2937 | ||
2938 | case L2CAP_CONF_RSP: | |
2939 | err = l2cap_config_rsp(conn, cmd, data); | |
2940 | break; | |
2941 | ||
2942 | case L2CAP_DISCONN_REQ: | |
2943 | err = l2cap_disconnect_req(conn, cmd, data); | |
2944 | break; | |
2945 | ||
2946 | case L2CAP_DISCONN_RSP: | |
2947 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2948 | break; | |
2949 | ||
2950 | case L2CAP_ECHO_REQ: | |
2951 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2952 | break; | |
2953 | ||
2954 | case L2CAP_ECHO_RSP: | |
2955 | break; | |
2956 | ||
2957 | case L2CAP_INFO_REQ: | |
2958 | err = l2cap_information_req(conn, cmd, data); | |
2959 | break; | |
2960 | ||
2961 | case L2CAP_INFO_RSP: | |
2962 | err = l2cap_information_rsp(conn, cmd, data); | |
2963 | break; | |
2964 | ||
2965 | default: | |
2966 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2967 | err = -EINVAL; | |
2968 | break; | |
2969 | } | |
2970 | ||
2971 | return err; | |
2972 | } | |
2973 | ||
2974 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2975 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2976 | { | |
2977 | switch (cmd->code) { | |
2978 | case L2CAP_COMMAND_REJ: | |
2979 | return 0; | |
2980 | ||
2981 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2982 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2983 | |
2984 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2985 | return 0; | |
2986 | ||
2987 | default: | |
2988 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2989 | return -EINVAL; | |
2990 | } | |
2991 | } | |
2992 | ||
2993 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2994 | struct sk_buff *skb) | |
1da177e4 LT |
2995 | { |
2996 | u8 *data = skb->data; | |
2997 | int len = skb->len; | |
2998 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2999 | int err; |
1da177e4 LT |
3000 | |
3001 | l2cap_raw_recv(conn, skb); | |
3002 | ||
3003 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3004 | u16 cmd_len; |
1da177e4 LT |
3005 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3006 | data += L2CAP_CMD_HDR_SIZE; | |
3007 | len -= L2CAP_CMD_HDR_SIZE; | |
3008 | ||
88219a0f | 3009 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3010 | |
88219a0f | 3011 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3012 | |
88219a0f | 3013 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3014 | BT_DBG("corrupted command"); |
3015 | break; | |
3016 | } | |
3017 | ||
3300d9a9 CT |
3018 | if (conn->hcon->type == LE_LINK) |
3019 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3020 | else | |
3021 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3022 | |
3023 | if (err) { | |
e2fd318e | 3024 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3025 | |
3026 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3027 | |
3028 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3029 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3030 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3031 | } | |
3032 | ||
88219a0f AV |
3033 | data += cmd_len; |
3034 | len -= cmd_len; | |
1da177e4 LT |
3035 | } |
3036 | ||
3037 | kfree_skb(skb); | |
3038 | } | |
3039 | ||
47d1ec61 | 3040 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3041 | { |
3042 | u16 our_fcs, rcv_fcs; | |
3043 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3044 | ||
47d1ec61 | 3045 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
3046 | skb_trim(skb, skb->len - 2); |
3047 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3048 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3049 | ||
3050 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3051 | return -EBADMSG; |
fcc203c3 GP |
3052 | } |
3053 | return 0; | |
3054 | } | |
3055 | ||
525cd185 | 3056 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3057 | { |
d5392c8f GP |
3058 | u16 control = 0; |
3059 | ||
6a026610 | 3060 | chan->frames_sent = 0; |
d5392c8f | 3061 | |
42e5c802 | 3062 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 3063 | |
e2ab4353 | 3064 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
64988868 | 3065 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3066 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3067 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3068 | } |
3069 | ||
e2ab4353 | 3070 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3071 | l2cap_retransmit_frames(chan); |
d5392c8f | 3072 | |
525cd185 | 3073 | l2cap_ertm_send(chan); |
d5392c8f | 3074 | |
e2ab4353 | 3075 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3076 | chan->frames_sent == 0) { |
d5392c8f | 3077 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 3078 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3079 | } |
3080 | } | |
3081 | ||
42e5c802 | 3082 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3083 | { |
3084 | struct sk_buff *next_skb; | |
bfbacc11 | 3085 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3086 | |
3087 | bt_cb(skb)->tx_seq = tx_seq; | |
3088 | bt_cb(skb)->sar = sar; | |
3089 | ||
f1c6775b | 3090 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3091 | if (!next_skb) { |
f1c6775b | 3092 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 3093 | return 0; |
8f17154f GP |
3094 | } |
3095 | ||
42e5c802 | 3096 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3097 | if (tx_seq_offset < 0) |
3098 | tx_seq_offset += 64; | |
3099 | ||
8f17154f | 3100 | do { |
9b53350d JPRV |
3101 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3102 | return -EINVAL; | |
3103 | ||
bfbacc11 | 3104 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 3105 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
3106 | if (next_tx_seq_offset < 0) |
3107 | next_tx_seq_offset += 64; | |
3108 | ||
3109 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3110 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3111 | return 0; |
8f17154f GP |
3112 | } |
3113 | ||
f1c6775b | 3114 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
3115 | break; |
3116 | ||
f1c6775b | 3117 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 3118 | |
f1c6775b | 3119 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3120 | |
3121 | return 0; | |
8f17154f GP |
3122 | } |
3123 | ||
525cd185 | 3124 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 3125 | { |
18778a63 | 3126 | struct sk_buff *_skb; |
1890d36b | 3127 | int err; |
18778a63 GP |
3128 | |
3129 | switch (control & L2CAP_CTRL_SAR) { | |
3130 | case L2CAP_SDU_UNSEGMENTED: | |
e2ab4353 | 3131 | if (test_bit(CONN_SAR_SDU, &chan->conn_state)) |
18778a63 GP |
3132 | goto drop; |
3133 | ||
23070494 | 3134 | return chan->ops->recv(chan->data, skb); |
18778a63 GP |
3135 | |
3136 | case L2CAP_SDU_START: | |
e2ab4353 | 3137 | if (test_bit(CONN_SAR_SDU, &chan->conn_state)) |
18778a63 GP |
3138 | goto drop; |
3139 | ||
6f61fd47 | 3140 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 3141 | |
0c1bc5c6 | 3142 | if (chan->sdu_len > chan->imtu) |
18778a63 GP |
3143 | goto disconnect; |
3144 | ||
6f61fd47 GP |
3145 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3146 | if (!chan->sdu) | |
1890d36b GP |
3147 | return -ENOMEM; |
3148 | ||
3149 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3150 | * condition we have to be sure that this will be executed | |
3151 | * only once, i.e., when alloc does not fail */ | |
3152 | skb_pull(skb, 2); | |
18778a63 | 3153 | |
6f61fd47 | 3154 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 3155 | |
e2ab4353 | 3156 | set_bit(CONN_SAR_SDU, &chan->conn_state); |
6f61fd47 | 3157 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
3158 | break; |
3159 | ||
3160 | case L2CAP_SDU_CONTINUE: | |
e2ab4353 | 3161 | if (!test_bit(CONN_SAR_SDU, &chan->conn_state)) |
18778a63 GP |
3162 | goto disconnect; |
3163 | ||
6f61fd47 | 3164 | if (!chan->sdu) |
18778a63 GP |
3165 | goto disconnect; |
3166 | ||
6f61fd47 GP |
3167 | chan->partial_sdu_len += skb->len; |
3168 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
3169 | goto drop; |
3170 | ||
6f61fd47 | 3171 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 3172 | |
18778a63 GP |
3173 | break; |
3174 | ||
3175 | case L2CAP_SDU_END: | |
e2ab4353 | 3176 | if (!test_bit(CONN_SAR_SDU, &chan->conn_state)) |
18778a63 GP |
3177 | goto disconnect; |
3178 | ||
6f61fd47 | 3179 | if (!chan->sdu) |
18778a63 GP |
3180 | goto disconnect; |
3181 | ||
fadd192e | 3182 | chan->partial_sdu_len += skb->len; |
18778a63 | 3183 | |
fadd192e MM |
3184 | if (chan->partial_sdu_len > chan->imtu) |
3185 | goto drop; | |
18778a63 | 3186 | |
fadd192e MM |
3187 | if (chan->partial_sdu_len != chan->sdu_len) |
3188 | goto drop; | |
4178ba46 | 3189 | |
fadd192e | 3190 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 3191 | |
6f61fd47 | 3192 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 3193 | if (!_skb) { |
1890d36b GP |
3194 | return -ENOMEM; |
3195 | } | |
3196 | ||
23070494 | 3197 | err = chan->ops->recv(chan->data, _skb); |
1890d36b | 3198 | if (err < 0) { |
18778a63 | 3199 | kfree_skb(_skb); |
1890d36b GP |
3200 | return err; |
3201 | } | |
3202 | ||
e2ab4353 | 3203 | clear_bit(CONN_SAR_SDU, &chan->conn_state); |
18778a63 | 3204 | |
6f61fd47 | 3205 | kfree_skb(chan->sdu); |
18778a63 GP |
3206 | break; |
3207 | } | |
3208 | ||
3209 | kfree_skb(skb); | |
1890d36b | 3210 | return 0; |
18778a63 GP |
3211 | |
3212 | drop: | |
6f61fd47 GP |
3213 | kfree_skb(chan->sdu); |
3214 | chan->sdu = NULL; | |
18778a63 GP |
3215 | |
3216 | disconnect: | |
8c1d787b | 3217 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
18778a63 GP |
3218 | kfree_skb(skb); |
3219 | return 0; | |
3220 | } | |
3221 | ||
26f880d2 | 3222 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3223 | { |
712132eb | 3224 | u16 control; |
712132eb | 3225 | |
26f880d2 | 3226 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3227 | |
26f880d2 MM |
3228 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3229 | ||
3230 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3231 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
3232 | l2cap_send_sframe(chan, control); | |
3233 | ||
3234 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3235 | ||
3236 | __clear_ack_timer(chan); | |
3237 | } | |
3238 | ||
3239 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3240 | { | |
3241 | u16 control; | |
712132eb | 3242 | |
e2ab4353 | 3243 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3244 | goto done; |
3245 | ||
42e5c802 | 3246 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 3247 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 3248 | l2cap_send_sframe(chan, control); |
6a026610 | 3249 | chan->retry_count = 1; |
712132eb | 3250 | |
1a09bcb9 GP |
3251 | __clear_retrans_timer(chan); |
3252 | __set_monitor_timer(chan); | |
712132eb | 3253 | |
e2ab4353 | 3254 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3255 | |
3256 | done: | |
e2ab4353 GP |
3257 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3258 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3259 | |
49208c9c | 3260 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3261 | } |
3262 | ||
e328140f | 3263 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3264 | { |
e328140f MM |
3265 | if (chan->mode == L2CAP_MODE_ERTM) { |
3266 | if (busy) | |
3267 | l2cap_ertm_enter_local_busy(chan); | |
3268 | else | |
3269 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3270 | } |
1890d36b GP |
3271 | } |
3272 | ||
525cd185 | 3273 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3274 | { |
c74e560c GP |
3275 | struct sk_buff *_skb; |
3276 | int err = -EINVAL; | |
3277 | ||
18778a63 GP |
3278 | /* |
3279 | * TODO: We have to notify the userland if some data is lost with the | |
3280 | * Streaming Mode. | |
3281 | */ | |
3282 | ||
c74e560c GP |
3283 | switch (control & L2CAP_CTRL_SAR) { |
3284 | case L2CAP_SDU_UNSEGMENTED: | |
e2ab4353 | 3285 | if (test_bit(CONN_SAR_SDU, &chan->conn_state)) { |
6f61fd47 | 3286 | kfree_skb(chan->sdu); |
c74e560c GP |
3287 | break; |
3288 | } | |
3289 | ||
23070494 | 3290 | err = chan->ops->recv(chan->data, skb); |
c74e560c GP |
3291 | if (!err) |
3292 | return 0; | |
3293 | ||
3294 | break; | |
3295 | ||
3296 | case L2CAP_SDU_START: | |
e2ab4353 | 3297 | if (test_bit(CONN_SAR_SDU, &chan->conn_state)) { |
6f61fd47 | 3298 | kfree_skb(chan->sdu); |
c74e560c GP |
3299 | break; |
3300 | } | |
3301 | ||
6f61fd47 | 3302 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3303 | skb_pull(skb, 2); |
3304 | ||
0c1bc5c6 | 3305 | if (chan->sdu_len > chan->imtu) { |
052897ca GP |
3306 | err = -EMSGSIZE; |
3307 | break; | |
3308 | } | |
3309 | ||
6f61fd47 GP |
3310 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3311 | if (!chan->sdu) { | |
c74e560c GP |
3312 | err = -ENOMEM; |
3313 | break; | |
3314 | } | |
3315 | ||
6f61fd47 | 3316 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3317 | |
e2ab4353 | 3318 | set_bit(CONN_SAR_SDU, &chan->conn_state); |
6f61fd47 | 3319 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3320 | err = 0; |
3321 | break; | |
3322 | ||
3323 | case L2CAP_SDU_CONTINUE: | |
e2ab4353 | 3324 | if (!test_bit(CONN_SAR_SDU, &chan->conn_state)) |
c74e560c GP |
3325 | break; |
3326 | ||
6f61fd47 | 3327 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3328 | |
6f61fd47 GP |
3329 | chan->partial_sdu_len += skb->len; |
3330 | if (chan->partial_sdu_len > chan->sdu_len) | |
3331 | kfree_skb(chan->sdu); | |
c74e560c GP |
3332 | else |
3333 | err = 0; | |
3334 | ||
3335 | break; | |
3336 | ||
3337 | case L2CAP_SDU_END: | |
e2ab4353 | 3338 | if (!test_bit(CONN_SAR_SDU, &chan->conn_state)) |
c74e560c GP |
3339 | break; |
3340 | ||
6f61fd47 | 3341 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3342 | |
e2ab4353 | 3343 | clear_bit(CONN_SAR_SDU, &chan->conn_state); |
6f61fd47 | 3344 | chan->partial_sdu_len += skb->len; |
c74e560c | 3345 | |
0c1bc5c6 | 3346 | if (chan->partial_sdu_len > chan->imtu) |
36f2fd58 GP |
3347 | goto drop; |
3348 | ||
6f61fd47 GP |
3349 | if (chan->partial_sdu_len == chan->sdu_len) { |
3350 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
23070494 | 3351 | err = chan->ops->recv(chan->data, _skb); |
c74e560c GP |
3352 | if (err < 0) |
3353 | kfree_skb(_skb); | |
3354 | } | |
c74e560c GP |
3355 | err = 0; |
3356 | ||
36f2fd58 | 3357 | drop: |
6f61fd47 | 3358 | kfree_skb(chan->sdu); |
c74e560c GP |
3359 | break; |
3360 | } | |
3361 | ||
3362 | kfree_skb(skb); | |
3363 | return err; | |
3364 | } | |
3365 | ||
525cd185 | 3366 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3367 | { |
3368 | struct sk_buff *skb; | |
afefdbc4 | 3369 | u16 control; |
8f17154f | 3370 | |
e328140f MM |
3371 | while ((skb = skb_peek(&chan->srej_q)) && |
3372 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3373 | int err; | |
3374 | ||
8f17154f GP |
3375 | if (bt_cb(skb)->tx_seq != tx_seq) |
3376 | break; | |
3377 | ||
f1c6775b | 3378 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3379 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
e328140f MM |
3380 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
3381 | ||
3382 | if (err < 0) { | |
3383 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3384 | break; | |
3385 | } | |
3386 | ||
42e5c802 GP |
3387 | chan->buffer_seq_srej = |
3388 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3389 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3390 | } |
3391 | } | |
3392 | ||
525cd185 | 3393 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3394 | { |
8f17154f GP |
3395 | struct srej_list *l, *tmp; |
3396 | u16 control; | |
3397 | ||
39d5a3ee | 3398 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3399 | if (l->tx_seq == tx_seq) { |
3400 | list_del(&l->list); | |
3401 | kfree(l); | |
3402 | return; | |
3403 | } | |
3404 | control = L2CAP_SUPER_SELECT_REJECT; | |
3405 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3406 | l2cap_send_sframe(chan, control); |
8f17154f | 3407 | list_del(&l->list); |
39d5a3ee | 3408 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3409 | } |
3410 | } | |
3411 | ||
525cd185 | 3412 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3413 | { |
8f17154f GP |
3414 | struct srej_list *new; |
3415 | u16 control; | |
3416 | ||
42e5c802 | 3417 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3418 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3419 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3420 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3421 | |
3422 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3423 | new->tx_seq = chan->expected_tx_seq; |
3424 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3425 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3426 | } |
42e5c802 | 3427 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3428 | } |
3429 | ||
525cd185 | 3430 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3431 | { |
1c2acffb | 3432 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3433 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3434 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3435 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3436 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3437 | int err = 0; |
3438 | ||
525cd185 GP |
3439 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3440 | tx_seq, rx_control); | |
1c2acffb | 3441 | |
9b16dc65 | 3442 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3443 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3444 | __clear_monitor_timer(chan); |
6a026610 | 3445 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3446 | __set_retrans_timer(chan); |
e2ab4353 | 3447 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3448 | } |
3449 | ||
42e5c802 GP |
3450 | chan->expected_ack_seq = req_seq; |
3451 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3452 | |
42e5c802 | 3453 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3454 | if (tx_seq_offset < 0) |
3455 | tx_seq_offset += 64; | |
3456 | ||
3457 | /* invalid tx_seq */ | |
47d1ec61 | 3458 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3459 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3460 | goto drop; |
3461 | } | |
3462 | ||
e2ab4353 | 3463 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3464 | goto drop; |
3465 | ||
02f1b641 MM |
3466 | if (tx_seq == chan->expected_tx_seq) |
3467 | goto expected; | |
3468 | ||
e2ab4353 | 3469 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3470 | struct srej_list *first; |
30afb5b2 | 3471 | |
39d5a3ee | 3472 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3473 | struct srej_list, list); |
3474 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3475 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3476 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3477 | |
3478 | list_del(&first->list); | |
3479 | kfree(first); | |
3480 | ||
39d5a3ee | 3481 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3482 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3483 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3484 | l2cap_send_ack(chan); |
49208c9c | 3485 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3486 | } |
3487 | } else { | |
3488 | struct srej_list *l; | |
9b53350d JPRV |
3489 | |
3490 | /* duplicated tx_seq */ | |
42e5c802 | 3491 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3492 | goto drop; |
8f17154f | 3493 | |
39d5a3ee | 3494 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3495 | if (l->tx_seq == tx_seq) { |
525cd185 | 3496 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3497 | return 0; |
3498 | } | |
3499 | } | |
525cd185 | 3500 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3501 | } |
3502 | } else { | |
9b53350d | 3503 | expected_tx_seq_offset = |
42e5c802 | 3504 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3505 | if (expected_tx_seq_offset < 0) |
3506 | expected_tx_seq_offset += 64; | |
3507 | ||
3508 | /* duplicated tx_seq */ | |
3509 | if (tx_seq_offset < expected_tx_seq_offset) | |
3510 | goto drop; | |
3511 | ||
e2ab4353 | 3512 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3513 | |
49208c9c | 3514 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3515 | |
39d5a3ee | 3516 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3517 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3518 | |
f1c6775b | 3519 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3520 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3521 | |
e2ab4353 | 3522 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3523 | |
525cd185 | 3524 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3525 | |
1a09bcb9 | 3526 | __clear_ack_timer(chan); |
1c2acffb | 3527 | } |
30afb5b2 GP |
3528 | return 0; |
3529 | ||
8f17154f | 3530 | expected: |
42e5c802 | 3531 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3532 | |
e2ab4353 | 3533 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3534 | bt_cb(skb)->tx_seq = tx_seq; |
3535 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3536 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3537 | return 0; |
3538 | } | |
3539 | ||
fadd192e MM |
3540 | err = l2cap_ertm_reassembly_sdu(chan, skb, rx_control); |
3541 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; | |
e328140f MM |
3542 | if (err < 0) { |
3543 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3544 | return err; | |
3545 | } | |
2ece3684 | 3546 | |
4ec10d97 | 3547 | if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3548 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3549 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3550 | } |
3551 | ||
1a09bcb9 | 3552 | __set_ack_timer(chan); |
c1b4f43b | 3553 | |
6a026610 GP |
3554 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3555 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3556 | l2cap_send_ack(chan); |
9e917af1 | 3557 | |
8f17154f | 3558 | return 0; |
9b53350d JPRV |
3559 | |
3560 | drop: | |
3561 | kfree_skb(skb); | |
3562 | return 0; | |
1c2acffb GP |
3563 | } |
3564 | ||
525cd185 | 3565 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3566 | { |
49208c9c | 3567 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3568 | rx_control); |
3569 | ||
42e5c802 GP |
3570 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3571 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3572 | |
e072745f | 3573 | if (rx_control & L2CAP_CTRL_POLL) { |
e2ab4353 GP |
3574 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3575 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3576 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3577 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3578 | __set_retrans_timer(chan); |
05fbd89d | 3579 | |
e2ab4353 | 3580 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 3581 | l2cap_send_srejtail(chan); |
05fbd89d | 3582 | } else { |
525cd185 | 3583 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3584 | } |
1d8f5d16 | 3585 | |
e072745f | 3586 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3587 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 3588 | |
e2ab4353 | 3589 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3590 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3591 | |
e072745f | 3592 | } else { |
e2ab4353 | 3593 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 3594 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3595 | __set_retrans_timer(chan); |
1c2acffb | 3596 | |
e2ab4353 GP |
3597 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
3598 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 3599 | l2cap_send_ack(chan); |
894718a6 | 3600 | else |
525cd185 | 3601 | l2cap_ertm_send(chan); |
e072745f GP |
3602 | } |
3603 | } | |
2246b2f1 | 3604 | |
525cd185 | 3605 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3606 | { |
e072745f | 3607 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3608 | |
525cd185 | 3609 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3610 | |
e2ab4353 | 3611 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 3612 | |
42e5c802 GP |
3613 | chan->expected_ack_seq = tx_seq; |
3614 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3615 | |
3616 | if (rx_control & L2CAP_CTRL_FINAL) { | |
e2ab4353 | 3617 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3618 | l2cap_retransmit_frames(chan); |
e072745f | 3619 | } else { |
525cd185 | 3620 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3621 | |
e2ab4353 GP |
3622 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
3623 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
3624 | } |
3625 | } | |
525cd185 | 3626 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3627 | { |
e072745f | 3628 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3629 | |
525cd185 | 3630 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3631 | |
e2ab4353 | 3632 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 3633 | |
e072745f | 3634 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3635 | chan->expected_ack_seq = tx_seq; |
3636 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3637 | |
e2ab4353 | 3638 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 3639 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 3640 | |
525cd185 | 3641 | l2cap_ertm_send(chan); |
dfc909be | 3642 | |
e2ab4353 | 3643 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3644 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3645 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3646 | } |
e072745f | 3647 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
e2ab4353 | 3648 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 3649 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 3650 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 3651 | else |
525cd185 | 3652 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3653 | } else { |
525cd185 | 3654 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 3655 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3656 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 3657 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 3658 | } |
e072745f GP |
3659 | } |
3660 | } | |
3661 | ||
525cd185 | 3662 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3663 | { |
e072745f GP |
3664 | u8 tx_seq = __get_reqseq(rx_control); |
3665 | ||
525cd185 | 3666 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3667 | |
e2ab4353 | 3668 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
3669 | chan->expected_ack_seq = tx_seq; |
3670 | l2cap_drop_acked_frames(chan); | |
e072745f | 3671 | |
3cb123d1 | 3672 | if (rx_control & L2CAP_CTRL_POLL) |
e2ab4353 | 3673 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 3674 | |
e2ab4353 | 3675 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 3676 | __clear_retrans_timer(chan); |
a2e12a2a | 3677 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3678 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3679 | return; |
e072745f | 3680 | } |
99b0d4b7 GP |
3681 | |
3682 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3683 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3684 | else |
525cd185 | 3685 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3686 | } |
3687 | ||
525cd185 | 3688 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3689 | { |
525cd185 | 3690 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3691 | |
9b16dc65 | 3692 | if (L2CAP_CTRL_FINAL & rx_control && |
e2ab4353 | 3693 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3694 | __clear_monitor_timer(chan); |
6a026610 | 3695 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3696 | __set_retrans_timer(chan); |
e2ab4353 | 3697 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
3698 | } |
3699 | ||
3700 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3701 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3702 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3703 | break; |
3704 | ||
e072745f | 3705 | case L2CAP_SUPER_REJECT: |
525cd185 | 3706 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3707 | break; |
2246b2f1 | 3708 | |
e072745f | 3709 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3710 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3711 | break; |
3712 | ||
3713 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3714 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3715 | break; |
3716 | } | |
3717 | ||
faaebd19 | 3718 | kfree_skb(skb); |
1c2acffb GP |
3719 | return 0; |
3720 | } | |
3721 | ||
218bb9df GP |
3722 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3723 | { | |
525cd185 | 3724 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3725 | u16 control; |
3726 | u8 req_seq; | |
3727 | int len, next_tx_seq_offset, req_seq_offset; | |
3728 | ||
3729 | control = get_unaligned_le16(skb->data); | |
3730 | skb_pull(skb, 2); | |
3731 | len = skb->len; | |
3732 | ||
3733 | /* | |
3734 | * We can just drop the corrupted I-frame here. | |
3735 | * Receiver will miss it and start proper recovery | |
3736 | * procedures and ask retransmission. | |
3737 | */ | |
47d1ec61 | 3738 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3739 | goto drop; |
3740 | ||
3741 | if (__is_sar_start(control) && __is_iframe(control)) | |
3742 | len -= 2; | |
3743 | ||
47d1ec61 | 3744 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3745 | len -= 2; |
3746 | ||
47d1ec61 | 3747 | if (len > chan->mps) { |
8c1d787b | 3748 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3749 | goto drop; |
3750 | } | |
3751 | ||
3752 | req_seq = __get_reqseq(control); | |
42e5c802 | 3753 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3754 | if (req_seq_offset < 0) |
3755 | req_seq_offset += 64; | |
3756 | ||
3757 | next_tx_seq_offset = | |
42e5c802 | 3758 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3759 | if (next_tx_seq_offset < 0) |
3760 | next_tx_seq_offset += 64; | |
3761 | ||
3762 | /* check for invalid req-seq */ | |
3763 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 3764 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3765 | goto drop; |
3766 | } | |
3767 | ||
3768 | if (__is_iframe(control)) { | |
3769 | if (len < 0) { | |
8c1d787b | 3770 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3771 | goto drop; |
3772 | } | |
3773 | ||
525cd185 | 3774 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3775 | } else { |
3776 | if (len != 0) { | |
3777 | BT_ERR("%d", len); | |
8c1d787b | 3778 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3779 | goto drop; |
3780 | } | |
3781 | ||
525cd185 | 3782 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3783 | } |
3784 | ||
3785 | return 0; | |
3786 | ||
3787 | drop: | |
3788 | kfree_skb(skb); | |
3789 | return 0; | |
3790 | } | |
3791 | ||
1da177e4 LT |
3792 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3793 | { | |
48454079 | 3794 | struct l2cap_chan *chan; |
bf734843 | 3795 | struct sock *sk = NULL; |
51893f88 | 3796 | u16 control; |
218bb9df GP |
3797 | u8 tx_seq; |
3798 | int len; | |
1da177e4 | 3799 | |
baa7e1fa | 3800 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3801 | if (!chan) { |
1da177e4 LT |
3802 | BT_DBG("unknown cid 0x%4.4x", cid); |
3803 | goto drop; | |
3804 | } | |
3805 | ||
48454079 | 3806 | sk = chan->sk; |
6840ed07 | 3807 | |
49208c9c | 3808 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 3809 | |
89bc500e | 3810 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
3811 | goto drop; |
3812 | ||
0c1bc5c6 | 3813 | switch (chan->mode) { |
1c2acffb GP |
3814 | case L2CAP_MODE_BASIC: |
3815 | /* If socket recv buffers overflows we drop data here | |
3816 | * which is *bad* because L2CAP has to be reliable. | |
3817 | * But we don't have any other choice. L2CAP doesn't | |
3818 | * provide flow control mechanism. */ | |
1da177e4 | 3819 | |
0c1bc5c6 | 3820 | if (chan->imtu < skb->len) |
1c2acffb | 3821 | goto drop; |
1da177e4 | 3822 | |
23070494 | 3823 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
3824 | goto done; |
3825 | break; | |
3826 | ||
3827 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3828 | if (!sock_owned_by_user(sk)) { |
3829 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3830 | } else { |
218bb9df | 3831 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3832 | goto drop; |
277ffbe3 | 3833 | } |
1c2acffb | 3834 | |
fcafde2e | 3835 | goto done; |
1c2acffb | 3836 | |
6840ed07 GP |
3837 | case L2CAP_MODE_STREAMING: |
3838 | control = get_unaligned_le16(skb->data); | |
3839 | skb_pull(skb, 2); | |
3840 | len = skb->len; | |
3841 | ||
47d1ec61 | 3842 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3843 | goto drop; |
3844 | ||
6840ed07 GP |
3845 | if (__is_sar_start(control)) |
3846 | len -= 2; | |
3847 | ||
47d1ec61 | 3848 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3849 | len -= 2; |
3850 | ||
47d1ec61 | 3851 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3852 | goto drop; |
3853 | ||
3854 | tx_seq = __get_txseq(control); | |
3855 | ||
42e5c802 GP |
3856 | if (chan->expected_tx_seq == tx_seq) |
3857 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3858 | else |
42e5c802 | 3859 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3860 | |
525cd185 | 3861 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3862 | |
3863 | goto done; | |
3864 | ||
1c2acffb | 3865 | default: |
0c1bc5c6 | 3866 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3867 | break; |
3868 | } | |
1da177e4 LT |
3869 | |
3870 | drop: | |
3871 | kfree_skb(skb); | |
3872 | ||
3873 | done: | |
0139418c MH |
3874 | if (sk) |
3875 | bh_unlock_sock(sk); | |
3876 | ||
1da177e4 LT |
3877 | return 0; |
3878 | } | |
3879 | ||
8e036fc3 | 3880 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 3881 | { |
6dcae1ea | 3882 | struct sock *sk = NULL; |
23691d75 | 3883 | struct l2cap_chan *chan; |
1da177e4 | 3884 | |
23691d75 GP |
3885 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
3886 | if (!chan) | |
1da177e4 LT |
3887 | goto drop; |
3888 | ||
23691d75 GP |
3889 | sk = chan->sk; |
3890 | ||
e0f0cb56 GP |
3891 | bh_lock_sock(sk); |
3892 | ||
1da177e4 LT |
3893 | BT_DBG("sk %p, len %d", sk, skb->len); |
3894 | ||
89bc500e | 3895 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
3896 | goto drop; |
3897 | ||
e13e21dc | 3898 | if (chan->imtu < skb->len) |
1da177e4 LT |
3899 | goto drop; |
3900 | ||
23070494 | 3901 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
3902 | goto done; |
3903 | ||
3904 | drop: | |
3905 | kfree_skb(skb); | |
3906 | ||
3907 | done: | |
af05b30b GP |
3908 | if (sk) |
3909 | bh_unlock_sock(sk); | |
1da177e4 LT |
3910 | return 0; |
3911 | } | |
3912 | ||
9f69bda6 GP |
3913 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3914 | { | |
6dcae1ea | 3915 | struct sock *sk = NULL; |
23691d75 | 3916 | struct l2cap_chan *chan; |
9f69bda6 | 3917 | |
23691d75 GP |
3918 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
3919 | if (!chan) | |
9f69bda6 GP |
3920 | goto drop; |
3921 | ||
23691d75 GP |
3922 | sk = chan->sk; |
3923 | ||
9f69bda6 GP |
3924 | bh_lock_sock(sk); |
3925 | ||
3926 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3927 | ||
89bc500e | 3928 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
3929 | goto drop; |
3930 | ||
e13e21dc | 3931 | if (chan->imtu < skb->len) |
9f69bda6 GP |
3932 | goto drop; |
3933 | ||
23070494 | 3934 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
3935 | goto done; |
3936 | ||
3937 | drop: | |
3938 | kfree_skb(skb); | |
3939 | ||
3940 | done: | |
3941 | if (sk) | |
3942 | bh_unlock_sock(sk); | |
3943 | return 0; | |
3944 | } | |
3945 | ||
1da177e4 LT |
3946 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3947 | { | |
3948 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3949 | u16 cid, len; |
3950 | __le16 psm; | |
1da177e4 LT |
3951 | |
3952 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3953 | cid = __le16_to_cpu(lh->cid); | |
3954 | len = __le16_to_cpu(lh->len); | |
3955 | ||
1c2acffb GP |
3956 | if (len != skb->len) { |
3957 | kfree_skb(skb); | |
3958 | return; | |
3959 | } | |
3960 | ||
1da177e4 LT |
3961 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3962 | ||
3963 | switch (cid) { | |
3300d9a9 | 3964 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3965 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3966 | l2cap_sig_channel(conn, skb); |
3967 | break; | |
3968 | ||
8db4dc46 | 3969 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3970 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3971 | skb_pull(skb, 2); |
3972 | l2cap_conless_channel(conn, psm, skb); | |
3973 | break; | |
3974 | ||
9f69bda6 GP |
3975 | case L2CAP_CID_LE_DATA: |
3976 | l2cap_att_channel(conn, cid, skb); | |
3977 | break; | |
3978 | ||
b501d6a1 AB |
3979 | case L2CAP_CID_SMP: |
3980 | if (smp_sig_channel(conn, skb)) | |
3981 | l2cap_conn_del(conn->hcon, EACCES); | |
3982 | break; | |
3983 | ||
1da177e4 LT |
3984 | default: |
3985 | l2cap_data_channel(conn, cid, skb); | |
3986 | break; | |
3987 | } | |
3988 | } | |
3989 | ||
3990 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3991 | ||
3992 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3993 | { | |
3994 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 3995 | struct l2cap_chan *c; |
1da177e4 LT |
3996 | |
3997 | if (type != ACL_LINK) | |
963cf687 | 3998 | return -EINVAL; |
1da177e4 LT |
3999 | |
4000 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4001 | ||
4002 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4003 | read_lock(&chan_list_lock); |
4004 | list_for_each_entry(c, &chan_list, global_l) { | |
4005 | struct sock *sk = c->sk; | |
4343478f | 4006 | |
89bc500e | 4007 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4008 | continue; |
4009 | ||
4010 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4011 | lm1 |= HCI_LM_ACCEPT; |
23691d75 | 4012 | if (c->role_switch) |
2af6b9d5 | 4013 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4014 | exact++; |
2af6b9d5 MH |
4015 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4016 | lm2 |= HCI_LM_ACCEPT; | |
23691d75 | 4017 | if (c->role_switch) |
2af6b9d5 MH |
4018 | lm2 |= HCI_LM_MASTER; |
4019 | } | |
1da177e4 | 4020 | } |
23691d75 | 4021 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4022 | |
4023 | return exact ? lm1 : lm2; | |
4024 | } | |
4025 | ||
4026 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4027 | { | |
0139418c MH |
4028 | struct l2cap_conn *conn; |
4029 | ||
1da177e4 LT |
4030 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4031 | ||
acd7d370 | 4032 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4033 | return -EINVAL; |
1da177e4 LT |
4034 | |
4035 | if (!status) { | |
1da177e4 LT |
4036 | conn = l2cap_conn_add(hcon, status); |
4037 | if (conn) | |
4038 | l2cap_conn_ready(conn); | |
0139418c | 4039 | } else |
e175072f | 4040 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4041 | |
4042 | return 0; | |
4043 | } | |
4044 | ||
2950f21a MH |
4045 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4046 | { | |
4047 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4048 | ||
4049 | BT_DBG("hcon %p", hcon); | |
4050 | ||
b5694506 | 4051 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
2950f21a MH |
4052 | return 0x13; |
4053 | ||
4054 | return conn->disc_reason; | |
4055 | } | |
4056 | ||
4057 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4058 | { |
4059 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4060 | ||
acd7d370 | 4061 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4062 | return -EINVAL; |
1da177e4 | 4063 | |
e175072f | 4064 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4065 | |
1da177e4 LT |
4066 | return 0; |
4067 | } | |
4068 | ||
4343478f | 4069 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4070 | { |
715ec005 | 4071 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4072 | return; |
4073 | ||
f62e4323 | 4074 | if (encrypt == 0x00) { |
4343478f | 4075 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 GP |
4076 | __clear_chan_timer(chan); |
4077 | __set_chan_timer(chan, HZ * 5); | |
4343478f | 4078 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4079 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4080 | } else { |
4343478f | 4081 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4082 | __clear_chan_timer(chan); |
f62e4323 MH |
4083 | } |
4084 | } | |
4085 | ||
8c1b2355 | 4086 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4087 | { |
0139418c | 4088 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4089 | struct l2cap_chan *chan; |
1da177e4 | 4090 | |
0139418c | 4091 | if (!conn) |
1da177e4 | 4092 | return 0; |
0139418c | 4093 | |
1da177e4 LT |
4094 | BT_DBG("conn %p", conn); |
4095 | ||
baa7e1fa | 4096 | read_lock(&conn->chan_lock); |
1da177e4 | 4097 | |
baa7e1fa | 4098 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4099 | struct sock *sk = chan->sk; |
baa7e1fa | 4100 | |
1da177e4 LT |
4101 | bh_lock_sock(sk); |
4102 | ||
f1cb9af5 VCG |
4103 | BT_DBG("chan->scid %d", chan->scid); |
4104 | ||
4105 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4106 | if (!status && encrypt) { | |
4107 | chan->sec_level = hcon->sec_level; | |
5d3de7df | 4108 | del_timer(&conn->security_timer); |
f1cb9af5 | 4109 | l2cap_chan_ready(sk); |
7034b911 | 4110 | smp_distribute_keys(conn, 0); |
f1cb9af5 VCG |
4111 | } |
4112 | ||
4113 | bh_unlock_sock(sk); | |
4114 | continue; | |
4115 | } | |
4116 | ||
c1360a1c | 4117 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4118 | bh_unlock_sock(sk); |
4119 | continue; | |
4120 | } | |
4121 | ||
89bc500e GP |
4122 | if (!status && (chan->state == BT_CONNECTED || |
4123 | chan->state == BT_CONFIG)) { | |
4343478f | 4124 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4125 | bh_unlock_sock(sk); |
4126 | continue; | |
4127 | } | |
4128 | ||
89bc500e | 4129 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4130 | if (!status) { |
4131 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4132 | req.scid = cpu_to_le16(chan->scid); |
4133 | req.psm = chan->psm; | |
1da177e4 | 4134 | |
fc7f8a7e | 4135 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4136 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4137 | |
fc7f8a7e | 4138 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4139 | L2CAP_CONN_REQ, sizeof(req), &req); |
4140 | } else { | |
c9b66675 GP |
4141 | __clear_chan_timer(chan); |
4142 | __set_chan_timer(chan, HZ / 10); | |
b1235d79 | 4143 | } |
89bc500e | 4144 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4145 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4146 | __u16 res, stat; |
1da177e4 | 4147 | |
b1235d79 | 4148 | if (!status) { |
df3c3931 JH |
4149 | if (bt_sk(sk)->defer_setup) { |
4150 | struct sock *parent = bt_sk(sk)->parent; | |
4151 | res = L2CAP_CR_PEND; | |
4152 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4153 | if (parent) |
4154 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4155 | } else { |
05558911 | 4156 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4157 | res = L2CAP_CR_SUCCESS; |
4158 | stat = L2CAP_CS_NO_INFO; | |
4159 | } | |
b1235d79 | 4160 | } else { |
89bc500e | 4161 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 4162 | __set_chan_timer(chan, HZ / 10); |
df3c3931 JH |
4163 | res = L2CAP_CR_SEC_BLOCK; |
4164 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4165 | } |
4166 | ||
fe4128e0 GP |
4167 | rsp.scid = cpu_to_le16(chan->dcid); |
4168 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4169 | rsp.result = cpu_to_le16(res); |
4170 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4171 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4172 | sizeof(rsp), &rsp); | |
b1235d79 | 4173 | } |
1da177e4 LT |
4174 | |
4175 | bh_unlock_sock(sk); | |
4176 | } | |
4177 | ||
baa7e1fa | 4178 | read_unlock(&conn->chan_lock); |
b1235d79 | 4179 | |
1da177e4 LT |
4180 | return 0; |
4181 | } | |
4182 | ||
4183 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4184 | { | |
4185 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4186 | ||
5a08ecce AE |
4187 | if (!conn) |
4188 | conn = l2cap_conn_add(hcon, 0); | |
4189 | ||
4190 | if (!conn) | |
1da177e4 LT |
4191 | goto drop; |
4192 | ||
4193 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4194 | ||
e702112f | 4195 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4196 | struct l2cap_hdr *hdr; |
48454079 | 4197 | struct l2cap_chan *chan; |
89794813 | 4198 | u16 cid; |
1da177e4 LT |
4199 | int len; |
4200 | ||
4201 | if (conn->rx_len) { | |
4202 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4203 | kfree_skb(conn->rx_skb); | |
4204 | conn->rx_skb = NULL; | |
4205 | conn->rx_len = 0; | |
4206 | l2cap_conn_unreliable(conn, ECOMM); | |
4207 | } | |
4208 | ||
aae7fe22 AE |
4209 | /* Start fragment always begin with Basic L2CAP header */ |
4210 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4211 | BT_ERR("Frame is too short (len %d)", skb->len); |
4212 | l2cap_conn_unreliable(conn, ECOMM); | |
4213 | goto drop; | |
4214 | } | |
4215 | ||
4216 | hdr = (struct l2cap_hdr *) skb->data; | |
4217 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4218 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4219 | |
4220 | if (len == skb->len) { | |
4221 | /* Complete frame received */ | |
4222 | l2cap_recv_frame(conn, skb); | |
4223 | return 0; | |
4224 | } | |
4225 | ||
4226 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4227 | ||
4228 | if (skb->len > len) { | |
4229 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4230 | skb->len, len); | |
4231 | l2cap_conn_unreliable(conn, ECOMM); | |
4232 | goto drop; | |
4233 | } | |
4234 | ||
baa7e1fa | 4235 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4236 | |
48454079 GP |
4237 | if (chan && chan->sk) { |
4238 | struct sock *sk = chan->sk; | |
89794813 | 4239 | |
0c1bc5c6 | 4240 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4241 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4242 | "MTU %d)", len, | |
0c1bc5c6 | 4243 | chan->imtu); |
48454079 GP |
4244 | bh_unlock_sock(sk); |
4245 | l2cap_conn_unreliable(conn, ECOMM); | |
4246 | goto drop; | |
4247 | } | |
89794813 | 4248 | bh_unlock_sock(sk); |
48454079 | 4249 | } |
89794813 | 4250 | |
1da177e4 | 4251 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4252 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4253 | if (!conn->rx_skb) | |
1da177e4 LT |
4254 | goto drop; |
4255 | ||
d626f62b | 4256 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4257 | skb->len); |
1da177e4 LT |
4258 | conn->rx_len = len - skb->len; |
4259 | } else { | |
4260 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4261 | ||
4262 | if (!conn->rx_len) { | |
4263 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4264 | l2cap_conn_unreliable(conn, ECOMM); | |
4265 | goto drop; | |
4266 | } | |
4267 | ||
4268 | if (skb->len > conn->rx_len) { | |
4269 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4270 | skb->len, conn->rx_len); | |
4271 | kfree_skb(conn->rx_skb); | |
4272 | conn->rx_skb = NULL; | |
4273 | conn->rx_len = 0; | |
4274 | l2cap_conn_unreliable(conn, ECOMM); | |
4275 | goto drop; | |
4276 | } | |
4277 | ||
d626f62b | 4278 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4279 | skb->len); |
1da177e4 LT |
4280 | conn->rx_len -= skb->len; |
4281 | ||
4282 | if (!conn->rx_len) { | |
4283 | /* Complete frame received */ | |
4284 | l2cap_recv_frame(conn, conn->rx_skb); | |
4285 | conn->rx_skb = NULL; | |
4286 | } | |
4287 | } | |
4288 | ||
4289 | drop: | |
4290 | kfree_skb(skb); | |
4291 | return 0; | |
4292 | } | |
4293 | ||
aef7d97c | 4294 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4295 | { |
23691d75 | 4296 | struct l2cap_chan *c; |
1da177e4 | 4297 | |
23691d75 | 4298 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4299 | |
23691d75 GP |
4300 | list_for_each_entry(c, &chan_list, global_l) { |
4301 | struct sock *sk = c->sk; | |
101545f6 | 4302 | |
903d343e | 4303 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4304 | batostr(&bt_sk(sk)->src), |
4305 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4306 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4307 | c->scid, c->dcid, c->imtu, c->omtu, |
4308 | c->sec_level, c->mode); | |
05558911 | 4309 | } |
1da177e4 | 4310 | |
23691d75 | 4311 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4312 | |
aef7d97c | 4313 | return 0; |
1da177e4 LT |
4314 | } |
4315 | ||
aef7d97c MH |
4316 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4317 | { | |
4318 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4319 | } | |
4320 | ||
4321 | static const struct file_operations l2cap_debugfs_fops = { | |
4322 | .open = l2cap_debugfs_open, | |
4323 | .read = seq_read, | |
4324 | .llseek = seq_lseek, | |
4325 | .release = single_release, | |
4326 | }; | |
4327 | ||
4328 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4329 | |
1da177e4 LT |
4330 | static struct hci_proto l2cap_hci_proto = { |
4331 | .name = "L2CAP", | |
4332 | .id = HCI_PROTO_L2CAP, | |
4333 | .connect_ind = l2cap_connect_ind, | |
4334 | .connect_cfm = l2cap_connect_cfm, | |
4335 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4336 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4337 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4338 | .recv_acldata = l2cap_recv_acldata |
4339 | }; | |
4340 | ||
64274518 | 4341 | int __init l2cap_init(void) |
1da177e4 LT |
4342 | { |
4343 | int err; | |
be9d1227 | 4344 | |
bb58f747 | 4345 | err = l2cap_init_sockets(); |
1da177e4 LT |
4346 | if (err < 0) |
4347 | return err; | |
4348 | ||
1da177e4 LT |
4349 | err = hci_register_proto(&l2cap_hci_proto); |
4350 | if (err < 0) { | |
4351 | BT_ERR("L2CAP protocol registration failed"); | |
4352 | bt_sock_unregister(BTPROTO_L2CAP); | |
4353 | goto error; | |
4354 | } | |
4355 | ||
aef7d97c MH |
4356 | if (bt_debugfs) { |
4357 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4358 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4359 | if (!l2cap_debugfs) | |
4360 | BT_ERR("Failed to create L2CAP debug file"); | |
4361 | } | |
1da177e4 | 4362 | |
1da177e4 LT |
4363 | return 0; |
4364 | ||
4365 | error: | |
bb58f747 | 4366 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4367 | return err; |
4368 | } | |
4369 | ||
64274518 | 4370 | void l2cap_exit(void) |
1da177e4 | 4371 | { |
aef7d97c | 4372 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4373 | |
1da177e4 LT |
4374 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4375 | BT_ERR("L2CAP protocol unregistration failed"); | |
4376 | ||
bb58f747 | 4377 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4378 | } |
4379 | ||
d1c4a17d GP |
4380 | module_param(disable_ertm, bool, 0644); |
4381 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |