Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 39 | #include <net/bluetooth/smp.h> |
1da177e4 | 40 | |
d1de6d46 | 41 | bool disable_ertm; |
f0709e03 | 42 | |
47ec1dcd | 43 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 44 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 45 | |
b5ad8b7f JB |
46 | static LIST_HEAD(chan_list); |
47 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 48 | |
1da177e4 LT |
49 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
50 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
51 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
52 | void *data); | |
710f9b0a | 53 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 54 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 55 | struct l2cap_chan *chan, int err); |
1da177e4 | 56 | |
d660366d | 57 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
58 | struct sk_buff_head *skbs, u8 event); |
59 | ||
0139418c | 60 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 61 | |
baa7e1fa | 62 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 63 | { |
3df91ea2 | 64 | struct l2cap_chan *c; |
3d57dc68 | 65 | |
3df91ea2 AE |
66 | list_for_each_entry(c, &conn->chan_l, list) { |
67 | if (c->dcid == cid) | |
68 | return c; | |
0139418c | 69 | } |
3df91ea2 | 70 | return NULL; |
0139418c MH |
71 | } |
72 | ||
baa7e1fa | 73 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 74 | { |
3df91ea2 | 75 | struct l2cap_chan *c; |
3d57dc68 | 76 | |
3df91ea2 AE |
77 | list_for_each_entry(c, &conn->chan_l, list) { |
78 | if (c->scid == cid) | |
79 | return c; | |
0139418c | 80 | } |
3df91ea2 | 81 | return NULL; |
0139418c MH |
82 | } |
83 | ||
84 | /* Find channel with given SCID. | |
ef191ade | 85 | * Returns locked channel. */ |
baa7e1fa | 86 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 87 | { |
48454079 | 88 | struct l2cap_chan *c; |
baa7e1fa | 89 | |
3df91ea2 | 90 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 91 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
92 | if (c) |
93 | l2cap_chan_lock(c); | |
3df91ea2 AE |
94 | mutex_unlock(&conn->chan_lock); |
95 | ||
48454079 | 96 | return c; |
0139418c MH |
97 | } |
98 | ||
baa7e1fa | 99 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 100 | { |
3df91ea2 | 101 | struct l2cap_chan *c; |
3d57dc68 | 102 | |
3df91ea2 AE |
103 | list_for_each_entry(c, &conn->chan_l, list) { |
104 | if (c->ident == ident) | |
105 | return c; | |
0139418c | 106 | } |
3df91ea2 | 107 | return NULL; |
0139418c MH |
108 | } |
109 | ||
23691d75 | 110 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 111 | { |
23691d75 | 112 | struct l2cap_chan *c; |
9e4425ff | 113 | |
23691d75 GP |
114 | list_for_each_entry(c, &chan_list, global_l) { |
115 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 116 | return c; |
9e4425ff | 117 | } |
250938cb | 118 | return NULL; |
9e4425ff GP |
119 | } |
120 | ||
121 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
122 | { | |
73b2ec18 GP |
123 | int err; |
124 | ||
333055f2 | 125 | write_lock(&chan_list_lock); |
9e4425ff | 126 | |
23691d75 | 127 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
128 | err = -EADDRINUSE; |
129 | goto done; | |
9e4425ff GP |
130 | } |
131 | ||
73b2ec18 GP |
132 | if (psm) { |
133 | chan->psm = psm; | |
134 | chan->sport = psm; | |
135 | err = 0; | |
136 | } else { | |
137 | u16 p; | |
138 | ||
139 | err = -EINVAL; | |
140 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 141 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
142 | chan->psm = cpu_to_le16(p); |
143 | chan->sport = cpu_to_le16(p); | |
144 | err = 0; | |
145 | break; | |
146 | } | |
147 | } | |
9e4425ff | 148 | |
73b2ec18 | 149 | done: |
333055f2 | 150 | write_unlock(&chan_list_lock); |
73b2ec18 | 151 | return err; |
9e4425ff GP |
152 | } |
153 | ||
154 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
155 | { | |
333055f2 | 156 | write_lock(&chan_list_lock); |
9e4425ff GP |
157 | |
158 | chan->scid = scid; | |
159 | ||
333055f2 | 160 | write_unlock(&chan_list_lock); |
9e4425ff GP |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
baa7e1fa | 165 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 166 | { |
8db4dc46 | 167 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 168 | |
8db4dc46 | 169 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 170 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
171 | return cid; |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
0e587be7 | 177 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 178 | { |
42d2d87c | 179 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
180 | state_to_string(state)); |
181 | ||
89bc500e GP |
182 | chan->state = state; |
183 | chan->ops->state_change(chan->data, state); | |
184 | } | |
185 | ||
0e587be7 AE |
186 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
187 | { | |
188 | struct sock *sk = chan->sk; | |
189 | ||
190 | lock_sock(sk); | |
191 | __l2cap_state_change(chan, state); | |
192 | release_sock(sk); | |
193 | } | |
194 | ||
2e0052e4 AE |
195 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
196 | { | |
197 | struct sock *sk = chan->sk; | |
198 | ||
199 | sk->sk_err = err; | |
200 | } | |
201 | ||
202 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
203 | { | |
204 | struct sock *sk = chan->sk; | |
205 | ||
206 | lock_sock(sk); | |
207 | __l2cap_chan_set_err(chan, err); | |
208 | release_sock(sk); | |
209 | } | |
210 | ||
4239d16f MM |
211 | static void __set_retrans_timer(struct l2cap_chan *chan) |
212 | { | |
213 | if (!delayed_work_pending(&chan->monitor_timer) && | |
214 | chan->retrans_timeout) { | |
215 | l2cap_set_timer(chan, &chan->retrans_timer, | |
216 | msecs_to_jiffies(chan->retrans_timeout)); | |
217 | } | |
218 | } | |
219 | ||
220 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
221 | { | |
222 | __clear_retrans_timer(chan); | |
223 | if (chan->monitor_timeout) { | |
224 | l2cap_set_timer(chan, &chan->monitor_timer, | |
225 | msecs_to_jiffies(chan->monitor_timeout)); | |
226 | } | |
227 | } | |
228 | ||
608bcc6d MM |
229 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
230 | u16 seq) | |
231 | { | |
232 | struct sk_buff *skb; | |
233 | ||
234 | skb_queue_walk(head, skb) { | |
235 | if (bt_cb(skb)->control.txseq == seq) | |
236 | return skb; | |
237 | } | |
238 | ||
239 | return NULL; | |
240 | } | |
241 | ||
3c588192 MM |
242 | /* ---- L2CAP sequence number lists ---- */ |
243 | ||
244 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
245 | * SREJ requests that are received and for frames that are to be | |
246 | * retransmitted. These seq_list functions implement a singly-linked | |
247 | * list in an array, where membership in the list can also be checked | |
248 | * in constant time. Items can also be added to the tail of the list | |
249 | * and removed from the head in constant time, without further memory | |
250 | * allocs or frees. | |
251 | */ | |
252 | ||
253 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
254 | { | |
255 | size_t alloc_size, i; | |
256 | ||
257 | /* Allocated size is a power of 2 to map sequence numbers | |
258 | * (which may be up to 14 bits) in to a smaller array that is | |
259 | * sized for the negotiated ERTM transmit windows. | |
260 | */ | |
261 | alloc_size = roundup_pow_of_two(size); | |
262 | ||
263 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
264 | if (!seq_list->list) | |
265 | return -ENOMEM; | |
266 | ||
267 | seq_list->mask = alloc_size - 1; | |
268 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
269 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
270 | for (i = 0; i < alloc_size; i++) | |
271 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
277 | { | |
278 | kfree(seq_list->list); | |
279 | } | |
280 | ||
281 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
282 | u16 seq) | |
283 | { | |
284 | /* Constant-time check for list membership */ | |
285 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
286 | } | |
287 | ||
288 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
289 | { | |
290 | u16 mask = seq_list->mask; | |
291 | ||
292 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
293 | /* In case someone tries to pop the head of an empty list */ | |
294 | return L2CAP_SEQ_LIST_CLEAR; | |
295 | } else if (seq_list->head == seq) { | |
296 | /* Head can be removed in constant time */ | |
297 | seq_list->head = seq_list->list[seq & mask]; | |
298 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
299 | ||
300 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
301 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
302 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
303 | } | |
304 | } else { | |
305 | /* Walk the list to find the sequence number */ | |
306 | u16 prev = seq_list->head; | |
307 | while (seq_list->list[prev & mask] != seq) { | |
308 | prev = seq_list->list[prev & mask]; | |
309 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
310 | return L2CAP_SEQ_LIST_CLEAR; | |
311 | } | |
312 | ||
313 | /* Unlink the number from the list and clear it */ | |
314 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
315 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
316 | if (seq_list->tail == seq) | |
317 | seq_list->tail = prev; | |
318 | } | |
319 | return seq; | |
320 | } | |
321 | ||
322 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
323 | { | |
324 | /* Remove the head in constant time */ | |
325 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
326 | } | |
327 | ||
328 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
329 | { | |
f522ae36 | 330 | u16 i; |
3c588192 | 331 | |
f522ae36 GP |
332 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
333 | return; | |
334 | ||
335 | for (i = 0; i <= seq_list->mask; i++) | |
336 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
337 | ||
338 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
339 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
340 | } |
341 | ||
342 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
343 | { | |
344 | u16 mask = seq_list->mask; | |
345 | ||
346 | /* All appends happen in constant time */ | |
347 | ||
f522ae36 GP |
348 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
349 | return; | |
3c588192 | 350 | |
f522ae36 GP |
351 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
352 | seq_list->head = seq; | |
353 | else | |
354 | seq_list->list[seq_list->tail & mask] = seq; | |
355 | ||
356 | seq_list->tail = seq; | |
357 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
358 | } |
359 | ||
721c4181 | 360 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 361 | { |
721c4181 GP |
362 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
363 | chan_timer.work); | |
3df91ea2 | 364 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
365 | int reason; |
366 | ||
e05dcc32 | 367 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 368 | |
3df91ea2 | 369 | mutex_lock(&conn->chan_lock); |
6be36555 | 370 | l2cap_chan_lock(chan); |
ab07801d | 371 | |
89bc500e | 372 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 373 | reason = ECONNREFUSED; |
89bc500e | 374 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
375 | chan->sec_level != BT_SECURITY_SDP) |
376 | reason = ECONNREFUSED; | |
377 | else | |
378 | reason = ETIMEDOUT; | |
379 | ||
0f852724 | 380 | l2cap_chan_close(chan, reason); |
ab07801d | 381 | |
6be36555 | 382 | l2cap_chan_unlock(chan); |
ab07801d | 383 | |
ba3bd0ee | 384 | chan->ops->close(chan->data); |
3df91ea2 AE |
385 | mutex_unlock(&conn->chan_lock); |
386 | ||
371fd835 | 387 | l2cap_chan_put(chan); |
ab07801d GP |
388 | } |
389 | ||
eef1d9b6 | 390 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
391 | { |
392 | struct l2cap_chan *chan; | |
393 | ||
394 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
395 | if (!chan) | |
396 | return NULL; | |
397 | ||
c03b355e AE |
398 | mutex_init(&chan->lock); |
399 | ||
333055f2 | 400 | write_lock(&chan_list_lock); |
23691d75 | 401 | list_add(&chan->global_l, &chan_list); |
333055f2 | 402 | write_unlock(&chan_list_lock); |
23691d75 | 403 | |
721c4181 | 404 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 405 | |
89bc500e GP |
406 | chan->state = BT_OPEN; |
407 | ||
71ba0e56 GP |
408 | atomic_set(&chan->refcnt, 1); |
409 | ||
2827011f MM |
410 | /* This flag is cleared in l2cap_chan_ready() */ |
411 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
412 | ||
eef1d9b6 | 413 | BT_DBG("chan %p", chan); |
abc545b8 | 414 | |
48454079 GP |
415 | return chan; |
416 | } | |
417 | ||
23691d75 | 418 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 419 | { |
333055f2 | 420 | write_lock(&chan_list_lock); |
23691d75 | 421 | list_del(&chan->global_l); |
333055f2 | 422 | write_unlock(&chan_list_lock); |
23691d75 | 423 | |
371fd835 | 424 | l2cap_chan_put(chan); |
6ff5abbf GP |
425 | } |
426 | ||
bd4b1653 AE |
427 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
428 | { | |
429 | chan->fcs = L2CAP_FCS_CRC16; | |
430 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
431 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
432 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->sec_level = BT_SECURITY_LOW; | |
434 | ||
435 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
436 | } | |
437 | ||
14a28491 | 438 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 439 | { |
af05b30b | 440 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 441 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 442 | |
9f5a0d7b | 443 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 444 | |
8c1d787b | 445 | chan->conn = conn; |
0139418c | 446 | |
5491120e AE |
447 | switch (chan->chan_type) { |
448 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
449 | if (conn->hcon->type == LE_LINK) { |
450 | /* LE connection */ | |
0c1bc5c6 | 451 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
452 | chan->scid = L2CAP_CID_LE_DATA; |
453 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
454 | } else { |
455 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 456 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 457 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 458 | } |
5491120e AE |
459 | break; |
460 | ||
461 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 462 | /* Connectionless socket */ |
fe4128e0 GP |
463 | chan->scid = L2CAP_CID_CONN_LESS; |
464 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 465 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
466 | break; |
467 | ||
468 | default: | |
0139418c | 469 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
470 | chan->scid = L2CAP_CID_SIGNALING; |
471 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 472 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
473 | } |
474 | ||
8f7975b1 AE |
475 | chan->local_id = L2CAP_BESTEFFORT_ID; |
476 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
477 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
478 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
479 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
480 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
481 | ||
371fd835 | 482 | l2cap_chan_hold(chan); |
baa7e1fa | 483 | |
3df91ea2 | 484 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
485 | } |
486 | ||
14a28491 | 487 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
488 | { |
489 | mutex_lock(&conn->chan_lock); | |
490 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 491 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
492 | } |
493 | ||
4519de9a | 494 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 495 | { |
48454079 | 496 | struct sock *sk = chan->sk; |
8c1d787b | 497 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
498 | struct sock *parent = bt_sk(sk)->parent; |
499 | ||
c9b66675 | 500 | __clear_chan_timer(chan); |
0139418c | 501 | |
49208c9c | 502 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 503 | |
8e87d142 | 504 | if (conn) { |
baa7e1fa | 505 | /* Delete from channel list */ |
3df91ea2 | 506 | list_del(&chan->list); |
3d57dc68 | 507 | |
371fd835 | 508 | l2cap_chan_put(chan); |
baa7e1fa | 509 | |
8c1d787b | 510 | chan->conn = NULL; |
0139418c MH |
511 | hci_conn_put(conn->hcon); |
512 | } | |
513 | ||
6be36555 AE |
514 | lock_sock(sk); |
515 | ||
0e587be7 | 516 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
517 | sock_set_flag(sk, SOCK_ZAPPED); |
518 | ||
519 | if (err) | |
2e0052e4 | 520 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
521 | |
522 | if (parent) { | |
523 | bt_accept_unlink(sk); | |
524 | parent->sk_data_ready(parent, 0); | |
525 | } else | |
526 | sk->sk_state_change(sk); | |
c13ffa62 | 527 | |
6be36555 AE |
528 | release_sock(sk); |
529 | ||
2827011f | 530 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 531 | return; |
2ead70b8 | 532 | |
ee556f66 GP |
533 | switch(chan->mode) { |
534 | case L2CAP_MODE_BASIC: | |
535 | break; | |
c13ffa62 | 536 | |
ee556f66 | 537 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
538 | __clear_retrans_timer(chan); |
539 | __clear_monitor_timer(chan); | |
540 | __clear_ack_timer(chan); | |
c13ffa62 | 541 | |
f1c6775b | 542 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 543 | |
3c588192 MM |
544 | l2cap_seq_list_free(&chan->srej_list); |
545 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
546 | |
547 | /* fall through */ | |
548 | ||
549 | case L2CAP_MODE_STREAMING: | |
550 | skb_queue_purge(&chan->tx_q); | |
551 | break; | |
c13ffa62 | 552 | } |
ee556f66 GP |
553 | |
554 | return; | |
0139418c MH |
555 | } |
556 | ||
4519de9a GP |
557 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
558 | { | |
559 | struct sock *sk; | |
560 | ||
561 | BT_DBG("parent %p", parent); | |
562 | ||
563 | /* Close not yet accepted channels */ | |
0f852724 | 564 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 565 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 566 | |
6be36555 | 567 | l2cap_chan_lock(chan); |
c9b66675 | 568 | __clear_chan_timer(chan); |
ba3bd0ee | 569 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 570 | l2cap_chan_unlock(chan); |
3df91ea2 | 571 | |
ba3bd0ee | 572 | chan->ops->close(chan->data); |
0f852724 | 573 | } |
4519de9a GP |
574 | } |
575 | ||
0f852724 | 576 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
577 | { |
578 | struct l2cap_conn *conn = chan->conn; | |
579 | struct sock *sk = chan->sk; | |
580 | ||
e05dcc32 AE |
581 | BT_DBG("chan %p state %s sk %p", chan, |
582 | state_to_string(chan->state), sk); | |
4519de9a | 583 | |
89bc500e | 584 | switch (chan->state) { |
4519de9a | 585 | case BT_LISTEN: |
6be36555 | 586 | lock_sock(sk); |
4519de9a | 587 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 588 | |
0e587be7 | 589 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 590 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 591 | release_sock(sk); |
4519de9a GP |
592 | break; |
593 | ||
594 | case BT_CONNECTED: | |
595 | case BT_CONFIG: | |
715ec005 | 596 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 597 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 598 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
599 | l2cap_send_disconn_req(conn, chan, reason); |
600 | } else | |
601 | l2cap_chan_del(chan, reason); | |
602 | break; | |
603 | ||
604 | case BT_CONNECT2: | |
715ec005 | 605 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
606 | conn->hcon->type == ACL_LINK) { |
607 | struct l2cap_conn_rsp rsp; | |
608 | __u16 result; | |
609 | ||
c5daa683 | 610 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
611 | result = L2CAP_CR_SEC_BLOCK; |
612 | else | |
613 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 614 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
615 | |
616 | rsp.scid = cpu_to_le16(chan->dcid); | |
617 | rsp.dcid = cpu_to_le16(chan->scid); | |
618 | rsp.result = cpu_to_le16(result); | |
ac73498c | 619 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
620 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
621 | sizeof(rsp), &rsp); | |
622 | } | |
623 | ||
624 | l2cap_chan_del(chan, reason); | |
625 | break; | |
626 | ||
627 | case BT_CONNECT: | |
628 | case BT_DISCONN: | |
629 | l2cap_chan_del(chan, reason); | |
630 | break; | |
631 | ||
632 | default: | |
6be36555 | 633 | lock_sock(sk); |
4519de9a | 634 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 635 | release_sock(sk); |
4519de9a GP |
636 | break; |
637 | } | |
638 | } | |
639 | ||
4343478f | 640 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 641 | { |
715ec005 | 642 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 643 | switch (chan->sec_level) { |
8556edd3 JH |
644 | case BT_SECURITY_HIGH: |
645 | return HCI_AT_DEDICATED_BONDING_MITM; | |
646 | case BT_SECURITY_MEDIUM: | |
647 | return HCI_AT_DEDICATED_BONDING; | |
648 | default: | |
649 | return HCI_AT_NO_BONDING; | |
650 | } | |
2983fd68 | 651 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
652 | if (chan->sec_level == BT_SECURITY_LOW) |
653 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 654 | |
4343478f | 655 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 656 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 657 | else |
8556edd3 | 658 | return HCI_AT_NO_BONDING; |
00ae4af9 | 659 | } else { |
4343478f | 660 | switch (chan->sec_level) { |
00ae4af9 | 661 | case BT_SECURITY_HIGH: |
8556edd3 | 662 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 663 | case BT_SECURITY_MEDIUM: |
8556edd3 | 664 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 665 | default: |
8556edd3 | 666 | return HCI_AT_NO_BONDING; |
00ae4af9 | 667 | } |
0684e5f9 | 668 | } |
8556edd3 JH |
669 | } |
670 | ||
671 | /* Service level security */ | |
d45fc423 | 672 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 673 | { |
8c1d787b | 674 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
675 | __u8 auth_type; |
676 | ||
4343478f | 677 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 678 | |
4343478f | 679 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
680 | } |
681 | ||
b5ad8b7f | 682 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
683 | { |
684 | u8 id; | |
685 | ||
686 | /* Get next available identificator. | |
687 | * 1 - 128 are used by kernel. | |
688 | * 129 - 199 are reserved. | |
689 | * 200 - 254 are used by utilities like l2ping, etc. | |
690 | */ | |
691 | ||
333055f2 | 692 | spin_lock(&conn->lock); |
4e8402a3 MH |
693 | |
694 | if (++conn->tx_ident > 128) | |
695 | conn->tx_ident = 1; | |
696 | ||
697 | id = conn->tx_ident; | |
698 | ||
333055f2 | 699 | spin_unlock(&conn->lock); |
4e8402a3 MH |
700 | |
701 | return id; | |
702 | } | |
703 | ||
4519de9a | 704 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
705 | { |
706 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 707 | u8 flags; |
4e8402a3 MH |
708 | |
709 | BT_DBG("code 0x%2.2x", code); | |
710 | ||
711 | if (!skb) | |
9a9c6a34 | 712 | return; |
4e8402a3 | 713 | |
e702112f AE |
714 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
715 | flags = ACL_START_NO_FLUSH; | |
716 | else | |
717 | flags = ACL_START; | |
718 | ||
14b12d0b | 719 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 720 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 721 | |
73d80deb LAD |
722 | hci_send_acl(conn->hchan, skb, flags); |
723 | } | |
724 | ||
725 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
726 | { | |
727 | struct hci_conn *hcon = chan->conn->hcon; | |
728 | u16 flags; | |
729 | ||
730 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
731 | skb->priority); | |
732 | ||
733 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
734 | lmp_no_flush_capable(hcon->hdev)) | |
735 | flags = ACL_START_NO_FLUSH; | |
736 | else | |
737 | flags = ACL_START; | |
14b12d0b | 738 | |
73d80deb LAD |
739 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
740 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
741 | } |
742 | ||
b76bbd66 MM |
743 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
744 | { | |
745 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
746 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
747 | ||
748 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
749 | /* S-Frame */ | |
750 | control->sframe = 1; | |
751 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
752 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
753 | ||
754 | control->sar = 0; | |
755 | control->txseq = 0; | |
756 | } else { | |
757 | /* I-Frame */ | |
758 | control->sframe = 0; | |
759 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
760 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
761 | ||
762 | control->poll = 0; | |
763 | control->super = 0; | |
764 | } | |
765 | } | |
766 | ||
b76bbd66 MM |
767 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
768 | { | |
769 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
770 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
771 | ||
772 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
773 | /* S-Frame */ | |
774 | control->sframe = 1; | |
775 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
776 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
777 | ||
778 | control->sar = 0; | |
779 | control->txseq = 0; | |
780 | } else { | |
781 | /* I-Frame */ | |
782 | control->sframe = 0; | |
783 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
784 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
785 | ||
786 | control->poll = 0; | |
787 | control->super = 0; | |
788 | } | |
789 | } | |
790 | ||
791 | static inline void __unpack_control(struct l2cap_chan *chan, | |
792 | struct sk_buff *skb) | |
793 | { | |
794 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
795 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
796 | &bt_cb(skb)->control); | |
cec8ab6e | 797 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
798 | } else { |
799 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
800 | &bt_cb(skb)->control); | |
cec8ab6e | 801 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
802 | } |
803 | } | |
804 | ||
b5c6aaed MM |
805 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
806 | { | |
807 | u32 packed; | |
808 | ||
809 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
810 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
811 | ||
812 | if (control->sframe) { | |
813 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
814 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
815 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
816 | } else { | |
817 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
818 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
819 | } | |
820 | ||
821 | return packed; | |
822 | } | |
823 | ||
824 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
825 | { | |
826 | u16 packed; | |
827 | ||
828 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
829 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
830 | ||
831 | if (control->sframe) { | |
832 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
833 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
834 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
835 | } else { | |
836 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
837 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
838 | } | |
839 | ||
840 | return packed; | |
841 | } | |
842 | ||
b76bbd66 MM |
843 | static inline void __pack_control(struct l2cap_chan *chan, |
844 | struct l2cap_ctrl *control, | |
845 | struct sk_buff *skb) | |
846 | { | |
847 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
848 | put_unaligned_le32(__pack_extended_control(control), | |
849 | skb->data + L2CAP_HDR_SIZE); | |
850 | } else { | |
851 | put_unaligned_le16(__pack_enhanced_control(control), | |
852 | skb->data + L2CAP_HDR_SIZE); | |
853 | } | |
854 | } | |
855 | ||
a67d7f6f MM |
856 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
857 | u32 control) | |
b5c6aaed MM |
858 | { |
859 | struct sk_buff *skb; | |
860 | struct l2cap_hdr *lh; | |
a67d7f6f | 861 | int hlen; |
b5c6aaed MM |
862 | |
863 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
864 | hlen = L2CAP_EXT_HDR_SIZE; | |
865 | else | |
866 | hlen = L2CAP_ENH_HDR_SIZE; | |
867 | ||
868 | if (chan->fcs == L2CAP_FCS_CRC16) | |
869 | hlen += L2CAP_FCS_SIZE; | |
870 | ||
a67d7f6f | 871 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 872 | |
b5c6aaed | 873 | if (!skb) |
a67d7f6f | 874 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
875 | |
876 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
877 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
878 | lh->cid = cpu_to_le16(chan->dcid); | |
879 | ||
a67d7f6f MM |
880 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
881 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
882 | else | |
883 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
884 | |
885 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 886 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
887 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
888 | } | |
889 | ||
890 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
891 | return skb; |
892 | } | |
893 | ||
894 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
895 | struct l2cap_ctrl *control) | |
896 | { | |
897 | struct sk_buff *skb; | |
898 | u32 control_field; | |
899 | ||
900 | BT_DBG("chan %p, control %p", chan, control); | |
901 | ||
902 | if (!control->sframe) | |
903 | return; | |
904 | ||
905 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
906 | !control->poll) | |
907 | control->final = 1; | |
908 | ||
909 | if (control->super == L2CAP_SUPER_RR) | |
910 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
911 | else if (control->super == L2CAP_SUPER_RNR) | |
912 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
913 | ||
914 | if (control->super != L2CAP_SUPER_SREJ) { | |
915 | chan->last_acked_seq = control->reqseq; | |
916 | __clear_ack_timer(chan); | |
917 | } | |
918 | ||
919 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
920 | control->final, control->poll, control->super); | |
921 | ||
922 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
923 | control_field = __pack_extended_control(control); | |
924 | else | |
925 | control_field = __pack_enhanced_control(control); | |
926 | ||
927 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
928 | if (!IS_ERR(skb)) | |
929 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
930 | } |
931 | ||
c9e3d5e0 | 932 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 933 | { |
c9e3d5e0 MM |
934 | struct l2cap_ctrl control; |
935 | ||
936 | BT_DBG("chan %p, poll %d", chan, poll); | |
937 | ||
938 | memset(&control, 0, sizeof(control)); | |
939 | control.sframe = 1; | |
940 | control.poll = poll; | |
941 | ||
942 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
943 | control.super = L2CAP_SUPER_RNR; | |
944 | else | |
945 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 946 | |
c9e3d5e0 MM |
947 | control.reqseq = chan->buffer_seq; |
948 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
949 | } |
950 | ||
b4450035 | 951 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 952 | { |
c1360a1c | 953 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
954 | } |
955 | ||
9b27f350 AE |
956 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
957 | { | |
958 | struct l2cap_conn *conn = chan->conn; | |
959 | struct l2cap_conn_req req; | |
960 | ||
961 | req.scid = cpu_to_le16(chan->scid); | |
962 | req.psm = chan->psm; | |
963 | ||
964 | chan->ident = l2cap_get_ident(conn); | |
965 | ||
966 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
967 | ||
968 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
969 | } | |
970 | ||
9f0caeb1 VCG |
971 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
972 | { | |
973 | struct sock *sk = chan->sk; | |
974 | struct sock *parent; | |
975 | ||
976 | lock_sock(sk); | |
977 | ||
978 | parent = bt_sk(sk)->parent; | |
979 | ||
980 | BT_DBG("sk %p, parent %p", sk, parent); | |
981 | ||
2827011f | 982 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
983 | chan->conf_state = 0; |
984 | __clear_chan_timer(chan); | |
985 | ||
986 | __l2cap_state_change(chan, BT_CONNECTED); | |
987 | sk->sk_state_change(sk); | |
988 | ||
989 | if (parent) | |
990 | parent->sk_data_ready(parent, 0); | |
991 | ||
992 | release_sock(sk); | |
993 | } | |
994 | ||
fc7f8a7e | 995 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 996 | { |
8c1d787b | 997 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 998 | |
9f0caeb1 VCG |
999 | if (conn->hcon->type == LE_LINK) { |
1000 | l2cap_chan_ready(chan); | |
1001 | return; | |
1002 | } | |
1003 | ||
79d554a6 | 1004 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1005 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1006 | return; | |
1007 | ||
d45fc423 | 1008 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
1009 | __l2cap_no_conn_pending(chan)) |
1010 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
1011 | } else { |
1012 | struct l2cap_info_req req; | |
ac73498c | 1013 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1014 | |
1015 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1016 | conn->info_ident = l2cap_get_ident(conn); | |
1017 | ||
ba13ccd9 | 1018 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
1019 | |
1020 | l2cap_send_cmd(conn, conn->info_ident, | |
1021 | L2CAP_INFO_REQ, sizeof(req), &req); | |
1022 | } | |
1023 | } | |
1024 | ||
cf6c2c0b GP |
1025 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1026 | { | |
1027 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1028 | if (!disable_ertm) |
cf6c2c0b GP |
1029 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1030 | ||
1031 | switch (mode) { | |
1032 | case L2CAP_MODE_ERTM: | |
1033 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1034 | case L2CAP_MODE_STREAMING: | |
1035 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1036 | default: | |
1037 | return 0x00; | |
1038 | } | |
1039 | } | |
1040 | ||
4519de9a | 1041 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1042 | { |
6be36555 | 1043 | struct sock *sk = chan->sk; |
22121fc9 GP |
1044 | struct l2cap_disconn_req req; |
1045 | ||
c13ffa62 GP |
1046 | if (!conn) |
1047 | return; | |
1048 | ||
0c1bc5c6 | 1049 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1050 | __clear_retrans_timer(chan); |
1051 | __clear_monitor_timer(chan); | |
1052 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1053 | } |
1054 | ||
fe4128e0 GP |
1055 | req.dcid = cpu_to_le16(chan->dcid); |
1056 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1057 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1058 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1059 | |
6be36555 | 1060 | lock_sock(sk); |
0e587be7 | 1061 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1062 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1063 | release_sock(sk); |
22121fc9 GP |
1064 | } |
1065 | ||
1da177e4 | 1066 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1067 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1068 | { | |
3df91ea2 | 1069 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1070 | |
1071 | BT_DBG("conn %p", conn); | |
1072 | ||
3df91ea2 | 1073 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1074 | |
3df91ea2 | 1075 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1076 | struct sock *sk = chan->sk; |
baa7e1fa | 1077 | |
6be36555 | 1078 | l2cap_chan_lock(chan); |
4e8402a3 | 1079 | |
715ec005 | 1080 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1081 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1082 | continue; |
1083 | } | |
1084 | ||
89bc500e | 1085 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1086 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1087 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1088 | l2cap_chan_unlock(chan); |
47731de7 GP |
1089 | continue; |
1090 | } | |
79d554a6 | 1091 | |
c1360a1c GP |
1092 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1093 | && test_bit(CONF_STATE2_DEVICE, | |
1094 | &chan->conf_state)) { | |
89bc500e | 1095 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1096 | l2cap_chan_unlock(chan); |
47731de7 | 1097 | continue; |
b1235d79 | 1098 | } |
47731de7 | 1099 | |
9b27f350 | 1100 | l2cap_send_conn_req(chan); |
47731de7 | 1101 | |
89bc500e | 1102 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1103 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1104 | char buf[128]; |
fe4128e0 GP |
1105 | rsp.scid = cpu_to_le16(chan->dcid); |
1106 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1107 | |
d45fc423 | 1108 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1109 | lock_sock(sk); |
c5daa683 GP |
1110 | if (test_bit(BT_SK_DEFER_SETUP, |
1111 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1112 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1113 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1114 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1115 | if (parent) |
1116 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1117 | |
1118 | } else { | |
0e587be7 | 1119 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1120 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1121 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1122 | } |
6be36555 | 1123 | release_sock(sk); |
79d554a6 | 1124 | } else { |
ac73498c AE |
1125 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1126 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1127 | } |
1128 | ||
fc7f8a7e GP |
1129 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1130 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1131 | |
c1360a1c | 1132 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1133 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1134 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1135 | continue; |
1136 | } | |
1137 | ||
c1360a1c | 1138 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1139 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1140 | l2cap_build_conf_req(chan, buf), buf); |
1141 | chan->num_conf_req++; | |
4e8402a3 MH |
1142 | } |
1143 | ||
6be36555 | 1144 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1145 | } |
1146 | ||
3df91ea2 | 1147 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1148 | } |
1149 | ||
c2287681 | 1150 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1151 | * Returns closest match, locked. |
1152 | */ | |
d9b88702 | 1153 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1154 | bdaddr_t *src, |
1155 | bdaddr_t *dst) | |
b62f328b | 1156 | { |
23691d75 | 1157 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1158 | |
23691d75 | 1159 | read_lock(&chan_list_lock); |
b62f328b | 1160 | |
23691d75 GP |
1161 | list_for_each_entry(c, &chan_list, global_l) { |
1162 | struct sock *sk = c->sk; | |
fe4128e0 | 1163 | |
89bc500e | 1164 | if (state && c->state != state) |
b62f328b VT |
1165 | continue; |
1166 | ||
23691d75 | 1167 | if (c->scid == cid) { |
c2287681 IY |
1168 | int src_match, dst_match; |
1169 | int src_any, dst_any; | |
1170 | ||
b62f328b | 1171 | /* Exact match. */ |
c2287681 IY |
1172 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1173 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1174 | if (src_match && dst_match) { | |
23691d75 GP |
1175 | read_unlock(&chan_list_lock); |
1176 | return c; | |
1177 | } | |
b62f328b VT |
1178 | |
1179 | /* Closest match */ | |
c2287681 IY |
1180 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1181 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1182 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1183 | (src_any && dst_any)) | |
23691d75 | 1184 | c1 = c; |
b62f328b VT |
1185 | } |
1186 | } | |
280f294f | 1187 | |
23691d75 | 1188 | read_unlock(&chan_list_lock); |
b62f328b | 1189 | |
23691d75 | 1190 | return c1; |
b62f328b VT |
1191 | } |
1192 | ||
1193 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1194 | { | |
c916fbe4 | 1195 | struct sock *parent, *sk; |
23691d75 | 1196 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1197 | |
1198 | BT_DBG(""); | |
1199 | ||
1200 | /* Check if we have socket listening on cid */ | |
23691d75 | 1201 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1202 | conn->src, conn->dst); |
23691d75 | 1203 | if (!pchan) |
b62f328b VT |
1204 | return; |
1205 | ||
23691d75 GP |
1206 | parent = pchan->sk; |
1207 | ||
aa2ac881 | 1208 | lock_sock(parent); |
62f3a2cf | 1209 | |
b62f328b VT |
1210 | /* Check for backlog size */ |
1211 | if (sk_acceptq_is_full(parent)) { | |
1212 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1213 | goto clean; | |
1214 | } | |
1215 | ||
80808e43 GP |
1216 | chan = pchan->ops->new_connection(pchan->data); |
1217 | if (!chan) | |
b62f328b VT |
1218 | goto clean; |
1219 | ||
80808e43 | 1220 | sk = chan->sk; |
5d41ce1d | 1221 | |
b62f328b VT |
1222 | hci_conn_hold(conn->hcon); |
1223 | ||
b62f328b VT |
1224 | bacpy(&bt_sk(sk)->src, conn->src); |
1225 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1226 | ||
d1010240 GP |
1227 | bt_accept_enqueue(parent, sk); |
1228 | ||
3d57dc68 | 1229 | l2cap_chan_add(conn, chan); |
48454079 | 1230 | |
c9b66675 | 1231 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1232 | |
0e587be7 | 1233 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1234 | parent->sk_data_ready(parent, 0); |
1235 | ||
b62f328b | 1236 | clean: |
aa2ac881 | 1237 | release_sock(parent); |
b62f328b VT |
1238 | } |
1239 | ||
4e8402a3 MH |
1240 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1241 | { | |
48454079 | 1242 | struct l2cap_chan *chan; |
4e8402a3 | 1243 | |
79d554a6 | 1244 | BT_DBG("conn %p", conn); |
4e8402a3 | 1245 | |
b62f328b VT |
1246 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1247 | l2cap_le_conn_ready(conn); | |
1248 | ||
160dc6ac VCG |
1249 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1250 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1251 | ||
3df91ea2 | 1252 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1253 | |
3df91ea2 | 1254 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1255 | |
6be36555 | 1256 | l2cap_chan_lock(chan); |
4e8402a3 | 1257 | |
63128451 | 1258 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1259 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1260 | l2cap_chan_ready(chan); |
acd7d370 | 1261 | |
63128451 | 1262 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1263 | struct sock *sk = chan->sk; |
c9b66675 | 1264 | __clear_chan_timer(chan); |
6be36555 | 1265 | lock_sock(sk); |
0e587be7 | 1266 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1267 | sk->sk_state_change(sk); |
6be36555 | 1268 | release_sock(sk); |
b501d6a1 | 1269 | |
89bc500e | 1270 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1271 | l2cap_do_start(chan); |
4e8402a3 | 1272 | |
6be36555 | 1273 | l2cap_chan_unlock(chan); |
4e8402a3 | 1274 | } |
79d554a6 | 1275 | |
3df91ea2 | 1276 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1277 | } |
1278 | ||
1279 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1280 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1281 | { | |
48454079 | 1282 | struct l2cap_chan *chan; |
4e8402a3 MH |
1283 | |
1284 | BT_DBG("conn %p", conn); | |
1285 | ||
3df91ea2 | 1286 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1287 | |
3df91ea2 | 1288 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1289 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1290 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1291 | } |
1292 | ||
3df91ea2 | 1293 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1294 | } |
1295 | ||
f878fcad | 1296 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1297 | { |
f878fcad | 1298 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1299 | info_timer.work); |
4e8402a3 | 1300 | |
984947dc | 1301 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1302 | conn->info_ident = 0; |
984947dc | 1303 | |
4e8402a3 MH |
1304 | l2cap_conn_start(conn); |
1305 | } | |
1306 | ||
5d3de7df VCG |
1307 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1308 | { | |
1309 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1310 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1311 | |
1312 | if (!conn) | |
1313 | return; | |
1314 | ||
1315 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1316 | ||
1317 | kfree_skb(conn->rx_skb); | |
1318 | ||
3df91ea2 AE |
1319 | mutex_lock(&conn->chan_lock); |
1320 | ||
5d3de7df VCG |
1321 | /* Kill channels */ |
1322 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1323 | l2cap_chan_hold(chan); |
6be36555 AE |
1324 | l2cap_chan_lock(chan); |
1325 | ||
5d3de7df | 1326 | l2cap_chan_del(chan, err); |
6be36555 AE |
1327 | |
1328 | l2cap_chan_unlock(chan); | |
1329 | ||
5d3de7df | 1330 | chan->ops->close(chan->data); |
61d6ef3e | 1331 | l2cap_chan_put(chan); |
5d3de7df VCG |
1332 | } |
1333 | ||
3df91ea2 AE |
1334 | mutex_unlock(&conn->chan_lock); |
1335 | ||
73d80deb LAD |
1336 | hci_chan_del(conn->hchan); |
1337 | ||
5d3de7df | 1338 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1339 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1340 | |
51a8efd7 | 1341 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1342 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1343 | smp_chan_destroy(conn); |
d26a2345 | 1344 | } |
5d3de7df VCG |
1345 | |
1346 | hcon->l2cap_data = NULL; | |
1347 | kfree(conn); | |
1348 | } | |
1349 | ||
6c9d42a1 | 1350 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1351 | { |
6c9d42a1 GP |
1352 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1353 | security_timer.work); | |
5d3de7df VCG |
1354 | |
1355 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1356 | } | |
1357 | ||
1da177e4 LT |
1358 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1359 | { | |
0139418c | 1360 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1361 | struct hci_chan *hchan; |
1da177e4 | 1362 | |
0139418c | 1363 | if (conn || status) |
1da177e4 LT |
1364 | return conn; |
1365 | ||
73d80deb LAD |
1366 | hchan = hci_chan_create(hcon); |
1367 | if (!hchan) | |
1368 | return NULL; | |
1369 | ||
0139418c | 1370 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1371 | if (!conn) { |
1372 | hci_chan_del(hchan); | |
1da177e4 | 1373 | return NULL; |
73d80deb | 1374 | } |
1da177e4 LT |
1375 | |
1376 | hcon->l2cap_data = conn; | |
1377 | conn->hcon = hcon; | |
73d80deb | 1378 | conn->hchan = hchan; |
1da177e4 | 1379 | |
73d80deb | 1380 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1381 | |
acd7d370 VT |
1382 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1383 | conn->mtu = hcon->hdev->le_mtu; | |
1384 | else | |
1385 | conn->mtu = hcon->hdev->acl_mtu; | |
1386 | ||
1da177e4 LT |
1387 | conn->src = &hcon->hdev->bdaddr; |
1388 | conn->dst = &hcon->dst; | |
1389 | ||
4e8402a3 MH |
1390 | conn->feat_mask = 0; |
1391 | ||
1da177e4 | 1392 | spin_lock_init(&conn->lock); |
3df91ea2 | 1393 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1394 | |
1395 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1396 | |
5d3de7df | 1397 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1398 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1399 | else |
030013d8 | 1400 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1401 | |
9f5a0d7b | 1402 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1403 | |
1da177e4 LT |
1404 | return conn; |
1405 | } | |
1406 | ||
1da177e4 | 1407 | /* ---- Socket interface ---- */ |
1da177e4 | 1408 | |
c2287681 | 1409 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1410 | * Returns closest match. |
1411 | */ | |
c2287681 IY |
1412 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1413 | bdaddr_t *src, | |
1414 | bdaddr_t *dst) | |
1da177e4 | 1415 | { |
23691d75 | 1416 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1417 | |
23691d75 | 1418 | read_lock(&chan_list_lock); |
e0f0cb56 | 1419 | |
23691d75 GP |
1420 | list_for_each_entry(c, &chan_list, global_l) { |
1421 | struct sock *sk = c->sk; | |
fe4128e0 | 1422 | |
89bc500e | 1423 | if (state && c->state != state) |
1da177e4 LT |
1424 | continue; |
1425 | ||
23691d75 | 1426 | if (c->psm == psm) { |
c2287681 IY |
1427 | int src_match, dst_match; |
1428 | int src_any, dst_any; | |
1429 | ||
1da177e4 | 1430 | /* Exact match. */ |
c2287681 IY |
1431 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1432 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1433 | if (src_match && dst_match) { | |
a7567b20 | 1434 | read_unlock(&chan_list_lock); |
23691d75 GP |
1435 | return c; |
1436 | } | |
1da177e4 LT |
1437 | |
1438 | /* Closest match */ | |
c2287681 IY |
1439 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1440 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1441 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1442 | (src_any && dst_any)) | |
23691d75 | 1443 | c1 = c; |
1da177e4 LT |
1444 | } |
1445 | } | |
1da177e4 | 1446 | |
23691d75 | 1447 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1448 | |
23691d75 | 1449 | return c1; |
1da177e4 LT |
1450 | } |
1451 | ||
8e9f9892 AG |
1452 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1453 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1454 | { |
5d41ce1d | 1455 | struct sock *sk = chan->sk; |
1da177e4 | 1456 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1457 | struct l2cap_conn *conn; |
1458 | struct hci_conn *hcon; | |
1459 | struct hci_dev *hdev; | |
09ab6f4c | 1460 | __u8 auth_type; |
44d0e48e | 1461 | int err; |
1da177e4 | 1462 | |
8e9f9892 AG |
1463 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1464 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1465 | |
af05b30b GP |
1466 | hdev = hci_get_route(dst, src); |
1467 | if (!hdev) | |
1da177e4 LT |
1468 | return -EHOSTUNREACH; |
1469 | ||
09fd0de5 | 1470 | hci_dev_lock(hdev); |
1da177e4 | 1471 | |
6be36555 | 1472 | l2cap_chan_lock(chan); |
03a00194 GP |
1473 | |
1474 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1475 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1476 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1477 | err = -EINVAL; | |
1478 | goto done; | |
1479 | } | |
1480 | ||
1481 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1482 | err = -EINVAL; | |
1483 | goto done; | |
1484 | } | |
1485 | ||
1486 | switch (chan->mode) { | |
1487 | case L2CAP_MODE_BASIC: | |
1488 | break; | |
1489 | case L2CAP_MODE_ERTM: | |
1490 | case L2CAP_MODE_STREAMING: | |
1491 | if (!disable_ertm) | |
1492 | break; | |
1493 | /* fall through */ | |
1494 | default: | |
1495 | err = -ENOTSUPP; | |
1496 | goto done; | |
1497 | } | |
1498 | ||
6be36555 AE |
1499 | lock_sock(sk); |
1500 | ||
03a00194 GP |
1501 | switch (sk->sk_state) { |
1502 | case BT_CONNECT: | |
1503 | case BT_CONNECT2: | |
1504 | case BT_CONFIG: | |
1505 | /* Already connecting */ | |
1506 | err = 0; | |
6be36555 | 1507 | release_sock(sk); |
03a00194 GP |
1508 | goto done; |
1509 | ||
1510 | case BT_CONNECTED: | |
1511 | /* Already connected */ | |
1512 | err = -EISCONN; | |
6be36555 | 1513 | release_sock(sk); |
03a00194 GP |
1514 | goto done; |
1515 | ||
1516 | case BT_OPEN: | |
1517 | case BT_BOUND: | |
1518 | /* Can connect */ | |
1519 | break; | |
1520 | ||
1521 | default: | |
1522 | err = -EBADFD; | |
6be36555 | 1523 | release_sock(sk); |
03a00194 GP |
1524 | goto done; |
1525 | } | |
1526 | ||
1527 | /* Set destination address and psm */ | |
9219b2a0 | 1528 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1529 | |
1530 | release_sock(sk); | |
1531 | ||
03a00194 GP |
1532 | chan->psm = psm; |
1533 | chan->dcid = cid; | |
1da177e4 | 1534 | |
4343478f | 1535 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1536 | |
fe4128e0 | 1537 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1538 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1539 | chan->sec_level, auth_type); |
acd7d370 | 1540 | else |
8e9f9892 | 1541 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1542 | chan->sec_level, auth_type); |
acd7d370 | 1543 | |
30e76272 VT |
1544 | if (IS_ERR(hcon)) { |
1545 | err = PTR_ERR(hcon); | |
1da177e4 | 1546 | goto done; |
30e76272 | 1547 | } |
1da177e4 LT |
1548 | |
1549 | conn = l2cap_conn_add(hcon, 0); | |
1550 | if (!conn) { | |
1551 | hci_conn_put(hcon); | |
30e76272 | 1552 | err = -ENOMEM; |
1da177e4 LT |
1553 | goto done; |
1554 | } | |
1555 | ||
9f0caeb1 VCG |
1556 | if (hcon->type == LE_LINK) { |
1557 | err = 0; | |
1558 | ||
1559 | if (!list_empty(&conn->chan_l)) { | |
1560 | err = -EBUSY; | |
1561 | hci_conn_put(hcon); | |
1562 | } | |
1563 | ||
1564 | if (err) | |
1565 | goto done; | |
1566 | } | |
1567 | ||
1da177e4 LT |
1568 | /* Update source addr of the socket */ |
1569 | bacpy(src, conn->src); | |
1570 | ||
6be36555 | 1571 | l2cap_chan_unlock(chan); |
48454079 | 1572 | l2cap_chan_add(conn, chan); |
6be36555 | 1573 | l2cap_chan_lock(chan); |
48454079 | 1574 | |
6be36555 | 1575 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1576 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1577 | |
1578 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1579 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1580 | __clear_chan_timer(chan); |
d45fc423 | 1581 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1582 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1583 | } else |
fc7f8a7e | 1584 | l2cap_do_start(chan); |
1da177e4 LT |
1585 | } |
1586 | ||
30e76272 VT |
1587 | err = 0; |
1588 | ||
1da177e4 | 1589 | done: |
6be36555 | 1590 | l2cap_chan_unlock(chan); |
09fd0de5 | 1591 | hci_dev_unlock(hdev); |
1da177e4 LT |
1592 | hci_dev_put(hdev); |
1593 | return err; | |
1594 | } | |
1595 | ||
dcba0dba | 1596 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1597 | { |
8c1d787b | 1598 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1599 | DECLARE_WAITQUEUE(wait, current); |
1600 | int err = 0; | |
1601 | int timeo = HZ/5; | |
1602 | ||
2b0b05dd | 1603 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1604 | set_current_state(TASK_INTERRUPTIBLE); |
1605 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1606 | if (!timeo) |
1607 | timeo = HZ/5; | |
1608 | ||
1609 | if (signal_pending(current)) { | |
1610 | err = sock_intr_errno(timeo); | |
1611 | break; | |
1612 | } | |
1613 | ||
1614 | release_sock(sk); | |
1615 | timeo = schedule_timeout(timeo); | |
1616 | lock_sock(sk); | |
a71a0cf4 | 1617 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1618 | |
1619 | err = sock_error(sk); | |
1620 | if (err) | |
1621 | break; | |
1622 | } | |
1623 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1624 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1625 | return err; |
1626 | } | |
1627 | ||
721c4181 | 1628 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1629 | { |
721c4181 | 1630 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1631 | monitor_timer.work); |
e90bac06 | 1632 | |
525cd185 | 1633 | BT_DBG("chan %p", chan); |
0e98958d | 1634 | |
6be36555 AE |
1635 | l2cap_chan_lock(chan); |
1636 | ||
80909e04 | 1637 | if (!chan->conn) { |
6be36555 | 1638 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1639 | l2cap_chan_put(chan); |
e90bac06 GP |
1640 | return; |
1641 | } | |
1642 | ||
401bb1f7 | 1643 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1644 | |
6be36555 | 1645 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1646 | l2cap_chan_put(chan); |
e90bac06 GP |
1647 | } |
1648 | ||
721c4181 | 1649 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1650 | { |
721c4181 | 1651 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1652 | retrans_timer.work); |
e90bac06 | 1653 | |
49208c9c | 1654 | BT_DBG("chan %p", chan); |
0e98958d | 1655 | |
6be36555 AE |
1656 | l2cap_chan_lock(chan); |
1657 | ||
80909e04 MM |
1658 | if (!chan->conn) { |
1659 | l2cap_chan_unlock(chan); | |
1660 | l2cap_chan_put(chan); | |
1661 | return; | |
1662 | } | |
6be36555 | 1663 | |
401bb1f7 | 1664 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1665 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1666 | l2cap_chan_put(chan); |
e90bac06 GP |
1667 | } |
1668 | ||
d660366d GP |
1669 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1670 | struct sk_buff_head *skbs) | |
6840ed07 | 1671 | { |
ccbb84af | 1672 | struct sk_buff *skb; |
3733937d | 1673 | struct l2cap_ctrl *control; |
6840ed07 | 1674 | |
3733937d MM |
1675 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1676 | ||
3733937d MM |
1677 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1678 | ||
1679 | while (!skb_queue_empty(&chan->tx_q)) { | |
1680 | ||
1681 | skb = skb_dequeue(&chan->tx_q); | |
1682 | ||
1683 | bt_cb(skb)->control.retries = 1; | |
1684 | control = &bt_cb(skb)->control; | |
1685 | ||
1686 | control->reqseq = 0; | |
1687 | control->txseq = chan->next_tx_seq; | |
1688 | ||
1689 | __pack_control(chan, control, skb); | |
6840ed07 | 1690 | |
47d1ec61 | 1691 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1692 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1693 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1694 | } |
1695 | ||
4343478f | 1696 | l2cap_do_send(chan, skb); |
6840ed07 | 1697 | |
3733937d MM |
1698 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1699 | ||
836be934 | 1700 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1701 | chan->frames_sent++; |
6840ed07 | 1702 | } |
6840ed07 GP |
1703 | } |
1704 | ||
67c9e840 | 1705 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1706 | { |
1707 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1708 | struct l2cap_ctrl *control; |
1709 | int sent = 0; | |
1710 | ||
1711 | BT_DBG("chan %p", chan); | |
1c2acffb | 1712 | |
89bc500e | 1713 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1714 | return -ENOTCONN; |
e90bac06 | 1715 | |
94122bbe MM |
1716 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1717 | return 0; | |
1718 | ||
18a48e76 MM |
1719 | while (chan->tx_send_head && |
1720 | chan->unacked_frames < chan->remote_tx_win && | |
1721 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1722 | |
18a48e76 | 1723 | skb = chan->tx_send_head; |
e90bac06 | 1724 | |
18a48e76 MM |
1725 | bt_cb(skb)->control.retries = 1; |
1726 | control = &bt_cb(skb)->control; | |
95ffa978 | 1727 | |
e2ab4353 | 1728 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1729 | control->final = 1; |
e2ab4353 | 1730 | |
18a48e76 MM |
1731 | control->reqseq = chan->buffer_seq; |
1732 | chan->last_acked_seq = chan->buffer_seq; | |
1733 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1734 | |
18a48e76 | 1735 | __pack_control(chan, control, skb); |
e90bac06 | 1736 | |
47d1ec61 | 1737 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1738 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1739 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1740 | } |
1741 | ||
18a48e76 MM |
1742 | /* Clone after data has been modified. Data is assumed to be |
1743 | read-only (for locking purposes) on cloned sk_buffs. | |
1744 | */ | |
1745 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1746 | |
18a48e76 MM |
1747 | if (!tx_skb) |
1748 | break; | |
1c2acffb | 1749 | |
18a48e76 | 1750 | __set_retrans_timer(chan); |
836be934 AE |
1751 | |
1752 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1753 | chan->unacked_frames++; |
6a026610 | 1754 | chan->frames_sent++; |
18a48e76 | 1755 | sent++; |
1c2acffb | 1756 | |
58d35f87 GP |
1757 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1758 | chan->tx_send_head = NULL; | |
1c2acffb | 1759 | else |
58d35f87 | 1760 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1761 | |
1762 | l2cap_do_send(chan, tx_skb); | |
1763 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1764 | } |
1765 | ||
18a48e76 MM |
1766 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1767 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1768 | ||
1769 | return sent; | |
9e917af1 GP |
1770 | } |
1771 | ||
e1fbd4c1 MM |
1772 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1773 | { | |
1774 | struct l2cap_ctrl control; | |
1775 | struct sk_buff *skb; | |
1776 | struct sk_buff *tx_skb; | |
1777 | u16 seq; | |
1778 | ||
1779 | BT_DBG("chan %p", chan); | |
1780 | ||
1781 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1782 | return; | |
1783 | ||
1784 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1785 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1786 | ||
1787 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1788 | if (!skb) { | |
1789 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1790 | seq); | |
1791 | continue; | |
1792 | } | |
1793 | ||
1794 | bt_cb(skb)->control.retries++; | |
1795 | control = bt_cb(skb)->control; | |
1796 | ||
1797 | if (chan->max_tx != 0 && | |
1798 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1799 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1800 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1801 | l2cap_seq_list_clear(&chan->retrans_list); | |
1802 | break; | |
1803 | } | |
1804 | ||
1805 | control.reqseq = chan->buffer_seq; | |
1806 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1807 | control.final = 1; | |
1808 | else | |
1809 | control.final = 0; | |
1810 | ||
1811 | if (skb_cloned(skb)) { | |
1812 | /* Cloned sk_buffs are read-only, so we need a | |
1813 | * writeable copy | |
1814 | */ | |
1815 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1816 | } else { | |
1817 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1818 | } | |
1819 | ||
1820 | if (!tx_skb) { | |
1821 | l2cap_seq_list_clear(&chan->retrans_list); | |
1822 | break; | |
1823 | } | |
1824 | ||
1825 | /* Update skb contents */ | |
1826 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1827 | put_unaligned_le32(__pack_extended_control(&control), | |
1828 | tx_skb->data + L2CAP_HDR_SIZE); | |
1829 | } else { | |
1830 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1831 | tx_skb->data + L2CAP_HDR_SIZE); | |
1832 | } | |
1833 | ||
1834 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1835 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1836 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1837 | L2CAP_FCS_SIZE)); | |
1838 | } | |
1839 | ||
1840 | l2cap_do_send(chan, tx_skb); | |
1841 | ||
1842 | BT_DBG("Resent txseq %d", control.txseq); | |
1843 | ||
1844 | chan->last_acked_seq = chan->buffer_seq; | |
1845 | } | |
1846 | } | |
1847 | ||
f80842a8 MM |
1848 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1849 | struct l2cap_ctrl *control) | |
1850 | { | |
1851 | BT_DBG("chan %p, control %p", chan, control); | |
1852 | ||
1853 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1854 | l2cap_ertm_resend(chan); | |
1855 | } | |
1856 | ||
d2a7ac5d MM |
1857 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1858 | struct l2cap_ctrl *control) | |
1859 | { | |
e1fbd4c1 MM |
1860 | struct sk_buff *skb; |
1861 | ||
1862 | BT_DBG("chan %p, control %p", chan, control); | |
1863 | ||
1864 | if (control->poll) | |
1865 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1866 | ||
1867 | l2cap_seq_list_clear(&chan->retrans_list); | |
1868 | ||
1869 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1870 | return; | |
1871 | ||
1872 | if (chan->unacked_frames) { | |
1873 | skb_queue_walk(&chan->tx_q, skb) { | |
1874 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1875 | skb == chan->tx_send_head) | |
1876 | break; | |
1877 | } | |
1878 | ||
1879 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1880 | if (skb == chan->tx_send_head) | |
1881 | break; | |
1882 | ||
1883 | l2cap_seq_list_append(&chan->retrans_list, | |
1884 | bt_cb(skb)->control.txseq); | |
1885 | } | |
1886 | ||
1887 | l2cap_ertm_resend(chan); | |
1888 | } | |
d2a7ac5d MM |
1889 | } |
1890 | ||
0a0aba42 | 1891 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1892 | { |
0a0aba42 MM |
1893 | struct l2cap_ctrl control; |
1894 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1895 | chan->last_acked_seq); | |
1896 | int threshold; | |
9e917af1 | 1897 | |
0a0aba42 MM |
1898 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1899 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1900 | |
0a0aba42 MM |
1901 | memset(&control, 0, sizeof(control)); |
1902 | control.sframe = 1; | |
dfc909be | 1903 | |
0a0aba42 MM |
1904 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1905 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1906 | __clear_ack_timer(chan); | |
1907 | control.super = L2CAP_SUPER_RNR; | |
1908 | control.reqseq = chan->buffer_seq; | |
1909 | l2cap_send_sframe(chan, &control); | |
1910 | } else { | |
1911 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1912 | l2cap_ertm_send(chan); | |
1913 | /* If any i-frames were sent, they included an ack */ | |
1914 | if (chan->buffer_seq == chan->last_acked_seq) | |
1915 | frames_to_ack = 0; | |
1916 | } | |
dfc909be | 1917 | |
0a0aba42 MM |
1918 | /* Ack now if the tx window is 3/4ths full. |
1919 | * Calculate without mul or div | |
1920 | */ | |
1921 | threshold = chan->tx_win; | |
1922 | threshold += threshold << 1; | |
1923 | threshold >>= 2; | |
1924 | ||
1925 | BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack, | |
1926 | threshold); | |
1927 | ||
1928 | if (frames_to_ack >= threshold) { | |
1929 | __clear_ack_timer(chan); | |
1930 | control.super = L2CAP_SUPER_RR; | |
1931 | control.reqseq = chan->buffer_seq; | |
1932 | l2cap_send_sframe(chan, &control); | |
1933 | frames_to_ack = 0; | |
1934 | } | |
1c2acffb | 1935 | |
0a0aba42 MM |
1936 | if (frames_to_ack) |
1937 | __set_ack_timer(chan); | |
1938 | } | |
b17e73bb SJ |
1939 | } |
1940 | ||
04124681 GP |
1941 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1942 | struct msghdr *msg, int len, | |
1943 | int count, struct sk_buff *skb) | |
1c2acffb | 1944 | { |
0952a57a | 1945 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1946 | struct sk_buff **frag; |
90338947 | 1947 | int sent = 0; |
1da177e4 | 1948 | |
59203a21 | 1949 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1950 | return -EFAULT; |
1da177e4 LT |
1951 | |
1952 | sent += count; | |
1953 | len -= count; | |
1954 | ||
1955 | /* Continuation fragments (no L2CAP header) */ | |
1956 | frag = &skb_shinfo(skb)->frag_list; | |
1957 | while (len) { | |
fbe00700 GP |
1958 | struct sk_buff *tmp; |
1959 | ||
1da177e4 LT |
1960 | count = min_t(unsigned int, conn->mtu, len); |
1961 | ||
fbe00700 GP |
1962 | tmp = chan->ops->alloc_skb(chan, count, |
1963 | msg->msg_flags & MSG_DONTWAIT); | |
1964 | if (IS_ERR(tmp)) | |
1965 | return PTR_ERR(tmp); | |
1966 | ||
1967 | *frag = tmp; | |
2f7719ce | 1968 | |
1c2acffb GP |
1969 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1970 | return -EFAULT; | |
1da177e4 | 1971 | |
5e59b791 LAD |
1972 | (*frag)->priority = skb->priority; |
1973 | ||
1da177e4 LT |
1974 | sent += count; |
1975 | len -= count; | |
1976 | ||
2d0ed3d5 GP |
1977 | skb->len += (*frag)->len; |
1978 | skb->data_len += (*frag)->len; | |
1979 | ||
1da177e4 LT |
1980 | frag = &(*frag)->next; |
1981 | } | |
1da177e4 LT |
1982 | |
1983 | return sent; | |
1c2acffb | 1984 | } |
1da177e4 | 1985 | |
5e59b791 LAD |
1986 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1987 | struct msghdr *msg, size_t len, | |
1988 | u32 priority) | |
1c2acffb | 1989 | { |
8c1d787b | 1990 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1991 | struct sk_buff *skb; |
03a51213 | 1992 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1993 | struct l2cap_hdr *lh; |
1994 | ||
6d5922b0 | 1995 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1996 | |
1997 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1998 | |
1999 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2000 | msg->msg_flags & MSG_DONTWAIT); |
2001 | if (IS_ERR(skb)) | |
2002 | return skb; | |
1c2acffb | 2003 | |
5e59b791 LAD |
2004 | skb->priority = priority; |
2005 | ||
1c2acffb GP |
2006 | /* Create L2CAP header */ |
2007 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2008 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2009 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2010 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2011 | |
0952a57a | 2012 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2013 | if (unlikely(err < 0)) { |
2014 | kfree_skb(skb); | |
2015 | return ERR_PTR(err); | |
2016 | } | |
2017 | return skb; | |
2018 | } | |
2019 | ||
5e59b791 LAD |
2020 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
2021 | struct msghdr *msg, size_t len, | |
2022 | u32 priority) | |
1c2acffb | 2023 | { |
8c1d787b | 2024 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2025 | struct sk_buff *skb; |
f2ba7fae | 2026 | int err, count; |
1c2acffb GP |
2027 | struct l2cap_hdr *lh; |
2028 | ||
6d5922b0 | 2029 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2030 | |
f2ba7fae | 2031 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2032 | |
f2ba7fae | 2033 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2034 | msg->msg_flags & MSG_DONTWAIT); |
2035 | if (IS_ERR(skb)) | |
2036 | return skb; | |
1c2acffb | 2037 | |
5e59b791 LAD |
2038 | skb->priority = priority; |
2039 | ||
1c2acffb GP |
2040 | /* Create L2CAP header */ |
2041 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2042 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2043 | lh->len = cpu_to_le16(len); |
1c2acffb | 2044 | |
0952a57a | 2045 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2046 | if (unlikely(err < 0)) { |
2047 | kfree_skb(skb); | |
2048 | return ERR_PTR(err); | |
2049 | } | |
2050 | return skb; | |
2051 | } | |
2052 | ||
ab0ff76d LAD |
2053 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
2054 | struct msghdr *msg, size_t len, | |
94122bbe | 2055 | u16 sdulen) |
1c2acffb | 2056 | { |
8c1d787b | 2057 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2058 | struct sk_buff *skb; |
e4ca6d98 | 2059 | int err, count, hlen; |
1c2acffb GP |
2060 | struct l2cap_hdr *lh; |
2061 | ||
6d5922b0 | 2062 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2063 | |
0ee0d208 GP |
2064 | if (!conn) |
2065 | return ERR_PTR(-ENOTCONN); | |
2066 | ||
e4ca6d98 AE |
2067 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2068 | hlen = L2CAP_EXT_HDR_SIZE; | |
2069 | else | |
2070 | hlen = L2CAP_ENH_HDR_SIZE; | |
2071 | ||
c74e560c | 2072 | if (sdulen) |
03a51213 | 2073 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2074 | |
47d1ec61 | 2075 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2076 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2077 | |
1c2acffb | 2078 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2079 | |
2080 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2081 | msg->msg_flags & MSG_DONTWAIT); |
2082 | if (IS_ERR(skb)) | |
2083 | return skb; | |
1c2acffb GP |
2084 | |
2085 | /* Create L2CAP header */ | |
2086 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2087 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2088 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2089 | |
18a48e76 MM |
2090 | /* Control header is populated later */ |
2091 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2092 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2093 | else | |
2094 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2095 | |
c74e560c | 2096 | if (sdulen) |
03a51213 | 2097 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2098 | |
0952a57a | 2099 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2100 | if (unlikely(err < 0)) { |
2101 | kfree_skb(skb); | |
2102 | return ERR_PTR(err); | |
2103 | } | |
e90bac06 | 2104 | |
18a48e76 | 2105 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2106 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2107 | return skb; |
1da177e4 LT |
2108 | } |
2109 | ||
94122bbe MM |
2110 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2111 | struct sk_buff_head *seg_queue, | |
2112 | struct msghdr *msg, size_t len) | |
c74e560c | 2113 | { |
c74e560c | 2114 | struct sk_buff *skb; |
94122bbe MM |
2115 | u16 sdu_len; |
2116 | size_t pdu_len; | |
2117 | int err = 0; | |
2118 | u8 sar; | |
c74e560c | 2119 | |
94122bbe | 2120 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2121 | |
94122bbe MM |
2122 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2123 | * so fragmented skbs are not used. The HCI layer's handling | |
2124 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2125 | */ | |
c74e560c | 2126 | |
94122bbe MM |
2127 | /* PDU size is derived from the HCI MTU */ |
2128 | pdu_len = chan->conn->mtu; | |
c74e560c | 2129 | |
94122bbe MM |
2130 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2131 | ||
2132 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2133 | if (chan->fcs) |
2134 | pdu_len -= L2CAP_FCS_SIZE; | |
2135 | ||
2136 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2137 | pdu_len -= L2CAP_EXT_HDR_SIZE; | |
2138 | else | |
2139 | pdu_len -= L2CAP_ENH_HDR_SIZE; | |
94122bbe MM |
2140 | |
2141 | /* Remote device may have requested smaller PDUs */ | |
2142 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2143 | ||
2144 | if (len <= pdu_len) { | |
2145 | sar = L2CAP_SAR_UNSEGMENTED; | |
2146 | sdu_len = 0; | |
2147 | pdu_len = len; | |
2148 | } else { | |
2149 | sar = L2CAP_SAR_START; | |
2150 | sdu_len = len; | |
2151 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2152 | } | |
2153 | ||
2154 | while (len > 0) { | |
2155 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2156 | |
c74e560c | 2157 | if (IS_ERR(skb)) { |
94122bbe | 2158 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2159 | return PTR_ERR(skb); |
2160 | } | |
2161 | ||
94122bbe MM |
2162 | bt_cb(skb)->control.sar = sar; |
2163 | __skb_queue_tail(seg_queue, skb); | |
2164 | ||
2165 | len -= pdu_len; | |
2166 | if (sdu_len) { | |
2167 | sdu_len = 0; | |
2168 | pdu_len += L2CAP_SDULEN_SIZE; | |
2169 | } | |
2170 | ||
2171 | if (len <= pdu_len) { | |
2172 | sar = L2CAP_SAR_END; | |
2173 | pdu_len = len; | |
2174 | } else { | |
2175 | sar = L2CAP_SAR_CONTINUE; | |
2176 | } | |
c74e560c | 2177 | } |
c74e560c | 2178 | |
94122bbe | 2179 | return err; |
c74e560c GP |
2180 | } |
2181 | ||
5e59b791 LAD |
2182 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2183 | u32 priority) | |
9a91a04a | 2184 | { |
9a91a04a | 2185 | struct sk_buff *skb; |
9a91a04a | 2186 | int err; |
94122bbe | 2187 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2188 | |
2189 | /* Connectionless channel */ | |
715ec005 | 2190 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2191 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2192 | if (IS_ERR(skb)) |
2193 | return PTR_ERR(skb); | |
2194 | ||
2195 | l2cap_do_send(chan, skb); | |
2196 | return len; | |
2197 | } | |
2198 | ||
2199 | switch (chan->mode) { | |
2200 | case L2CAP_MODE_BASIC: | |
2201 | /* Check outgoing MTU */ | |
2202 | if (len > chan->omtu) | |
2203 | return -EMSGSIZE; | |
2204 | ||
2205 | /* Create a basic PDU */ | |
5e59b791 | 2206 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2207 | if (IS_ERR(skb)) |
2208 | return PTR_ERR(skb); | |
2209 | ||
2210 | l2cap_do_send(chan, skb); | |
2211 | err = len; | |
2212 | break; | |
2213 | ||
2214 | case L2CAP_MODE_ERTM: | |
2215 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2216 | /* Check outgoing MTU */ |
2217 | if (len > chan->omtu) { | |
2218 | err = -EMSGSIZE; | |
2219 | break; | |
2220 | } | |
9a91a04a | 2221 | |
94122bbe | 2222 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2223 | |
94122bbe MM |
2224 | /* Do segmentation before calling in to the state machine, |
2225 | * since it's possible to block while waiting for memory | |
2226 | * allocation. | |
2227 | */ | |
2228 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2229 | |
94122bbe MM |
2230 | /* The channel could have been closed while segmenting, |
2231 | * check that it is still connected. | |
2232 | */ | |
2233 | if (chan->state != BT_CONNECTED) { | |
2234 | __skb_queue_purge(&seg_queue); | |
2235 | err = -ENOTCONN; | |
9a91a04a GP |
2236 | } |
2237 | ||
94122bbe | 2238 | if (err) |
9a91a04a | 2239 | break; |
9a91a04a | 2240 | |
3733937d | 2241 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2242 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2243 | else |
d660366d | 2244 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2245 | |
d660366d | 2246 | err = len; |
9a91a04a | 2247 | |
94122bbe MM |
2248 | /* If the skbs were not queued for sending, they'll still be in |
2249 | * seg_queue and need to be purged. | |
2250 | */ | |
2251 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2252 | break; |
2253 | ||
2254 | default: | |
2255 | BT_DBG("bad state %1.1x", chan->mode); | |
2256 | err = -EBADFD; | |
2257 | } | |
2258 | ||
2259 | return err; | |
2260 | } | |
2261 | ||
d2a7ac5d MM |
2262 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2263 | { | |
bed68bde MM |
2264 | struct l2cap_ctrl control; |
2265 | u16 seq; | |
2266 | ||
2267 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2268 | ||
2269 | memset(&control, 0, sizeof(control)); | |
2270 | control.sframe = 1; | |
2271 | control.super = L2CAP_SUPER_SREJ; | |
2272 | ||
2273 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2274 | seq = __next_seq(chan, seq)) { | |
2275 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2276 | control.reqseq = seq; | |
2277 | l2cap_send_sframe(chan, &control); | |
2278 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2279 | } | |
2280 | } | |
2281 | ||
2282 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2283 | } |
2284 | ||
2285 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2286 | { | |
bed68bde MM |
2287 | struct l2cap_ctrl control; |
2288 | ||
2289 | BT_DBG("chan %p", chan); | |
2290 | ||
2291 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2292 | return; | |
2293 | ||
2294 | memset(&control, 0, sizeof(control)); | |
2295 | control.sframe = 1; | |
2296 | control.super = L2CAP_SUPER_SREJ; | |
2297 | control.reqseq = chan->srej_list.tail; | |
2298 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2299 | } |
2300 | ||
2301 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2302 | { | |
bed68bde MM |
2303 | struct l2cap_ctrl control; |
2304 | u16 initial_head; | |
2305 | u16 seq; | |
2306 | ||
2307 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2308 | ||
2309 | memset(&control, 0, sizeof(control)); | |
2310 | control.sframe = 1; | |
2311 | control.super = L2CAP_SUPER_SREJ; | |
2312 | ||
2313 | /* Capture initial list head to allow only one pass through the list. */ | |
2314 | initial_head = chan->srej_list.head; | |
2315 | ||
2316 | do { | |
2317 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2318 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2319 | break; | |
2320 | ||
2321 | control.reqseq = seq; | |
2322 | l2cap_send_sframe(chan, &control); | |
2323 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2324 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2325 | } |
2326 | ||
608bcc6d MM |
2327 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2328 | { | |
2329 | struct sk_buff *acked_skb; | |
2330 | u16 ackseq; | |
2331 | ||
2332 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2333 | ||
2334 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2335 | return; | |
2336 | ||
2337 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2338 | chan->expected_ack_seq, chan->unacked_frames); | |
2339 | ||
2340 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2341 | ackseq = __next_seq(chan, ackseq)) { | |
2342 | ||
2343 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2344 | if (acked_skb) { | |
2345 | skb_unlink(acked_skb, &chan->tx_q); | |
2346 | kfree_skb(acked_skb); | |
2347 | chan->unacked_frames--; | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | chan->expected_ack_seq = reqseq; | |
2352 | ||
2353 | if (chan->unacked_frames == 0) | |
2354 | __clear_retrans_timer(chan); | |
2355 | ||
2356 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2357 | } | |
2358 | ||
2359 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2360 | { | |
2361 | BT_DBG("chan %p", chan); | |
2362 | ||
2363 | chan->expected_tx_seq = chan->buffer_seq; | |
2364 | l2cap_seq_list_clear(&chan->srej_list); | |
2365 | skb_queue_purge(&chan->srej_q); | |
2366 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2367 | } | |
2368 | ||
d660366d GP |
2369 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2370 | struct l2cap_ctrl *control, | |
2371 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2372 | { |
608bcc6d MM |
2373 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2374 | event); | |
2375 | ||
2376 | switch (event) { | |
2377 | case L2CAP_EV_DATA_REQUEST: | |
2378 | if (chan->tx_send_head == NULL) | |
2379 | chan->tx_send_head = skb_peek(skbs); | |
2380 | ||
2381 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2382 | l2cap_ertm_send(chan); | |
2383 | break; | |
2384 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2385 | BT_DBG("Enter LOCAL_BUSY"); | |
2386 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2387 | ||
2388 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2389 | /* The SREJ_SENT state must be aborted if we are to | |
2390 | * enter the LOCAL_BUSY state. | |
2391 | */ | |
2392 | l2cap_abort_rx_srej_sent(chan); | |
2393 | } | |
2394 | ||
2395 | l2cap_send_ack(chan); | |
2396 | ||
2397 | break; | |
2398 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2399 | BT_DBG("Exit LOCAL_BUSY"); | |
2400 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2401 | ||
2402 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2403 | struct l2cap_ctrl local_control; | |
2404 | ||
2405 | memset(&local_control, 0, sizeof(local_control)); | |
2406 | local_control.sframe = 1; | |
2407 | local_control.super = L2CAP_SUPER_RR; | |
2408 | local_control.poll = 1; | |
2409 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2410 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2411 | |
2412 | chan->retry_count = 1; | |
2413 | __set_monitor_timer(chan); | |
2414 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2415 | } | |
2416 | break; | |
2417 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2418 | l2cap_process_reqseq(chan, control->reqseq); | |
2419 | break; | |
2420 | case L2CAP_EV_EXPLICIT_POLL: | |
2421 | l2cap_send_rr_or_rnr(chan, 1); | |
2422 | chan->retry_count = 1; | |
2423 | __set_monitor_timer(chan); | |
2424 | __clear_ack_timer(chan); | |
2425 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2426 | break; | |
2427 | case L2CAP_EV_RETRANS_TO: | |
2428 | l2cap_send_rr_or_rnr(chan, 1); | |
2429 | chan->retry_count = 1; | |
2430 | __set_monitor_timer(chan); | |
2431 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2432 | break; | |
2433 | case L2CAP_EV_RECV_FBIT: | |
2434 | /* Nothing to process */ | |
2435 | break; | |
2436 | default: | |
2437 | break; | |
2438 | } | |
608bcc6d MM |
2439 | } |
2440 | ||
d660366d GP |
2441 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2442 | struct l2cap_ctrl *control, | |
2443 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2444 | { |
608bcc6d MM |
2445 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2446 | event); | |
2447 | ||
2448 | switch (event) { | |
2449 | case L2CAP_EV_DATA_REQUEST: | |
2450 | if (chan->tx_send_head == NULL) | |
2451 | chan->tx_send_head = skb_peek(skbs); | |
2452 | /* Queue data, but don't send. */ | |
2453 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2454 | break; | |
2455 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2456 | BT_DBG("Enter LOCAL_BUSY"); | |
2457 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2458 | ||
2459 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2460 | /* The SREJ_SENT state must be aborted if we are to | |
2461 | * enter the LOCAL_BUSY state. | |
2462 | */ | |
2463 | l2cap_abort_rx_srej_sent(chan); | |
2464 | } | |
2465 | ||
2466 | l2cap_send_ack(chan); | |
2467 | ||
2468 | break; | |
2469 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2470 | BT_DBG("Exit LOCAL_BUSY"); | |
2471 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2472 | ||
2473 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2474 | struct l2cap_ctrl local_control; | |
2475 | memset(&local_control, 0, sizeof(local_control)); | |
2476 | local_control.sframe = 1; | |
2477 | local_control.super = L2CAP_SUPER_RR; | |
2478 | local_control.poll = 1; | |
2479 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2480 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2481 | |
2482 | chan->retry_count = 1; | |
2483 | __set_monitor_timer(chan); | |
2484 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2485 | } | |
2486 | break; | |
2487 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2488 | l2cap_process_reqseq(chan, control->reqseq); | |
2489 | ||
2490 | /* Fall through */ | |
2491 | ||
2492 | case L2CAP_EV_RECV_FBIT: | |
2493 | if (control && control->final) { | |
2494 | __clear_monitor_timer(chan); | |
2495 | if (chan->unacked_frames > 0) | |
2496 | __set_retrans_timer(chan); | |
2497 | chan->retry_count = 0; | |
2498 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2499 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2500 | } | |
2501 | break; | |
2502 | case L2CAP_EV_EXPLICIT_POLL: | |
2503 | /* Ignore */ | |
2504 | break; | |
2505 | case L2CAP_EV_MONITOR_TO: | |
2506 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2507 | l2cap_send_rr_or_rnr(chan, 1); | |
2508 | __set_monitor_timer(chan); | |
2509 | chan->retry_count++; | |
2510 | } else { | |
2511 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2512 | } | |
2513 | break; | |
2514 | default: | |
2515 | break; | |
2516 | } | |
608bcc6d MM |
2517 | } |
2518 | ||
d660366d GP |
2519 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2520 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2521 | { |
608bcc6d MM |
2522 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2523 | chan, control, skbs, event, chan->tx_state); | |
2524 | ||
2525 | switch (chan->tx_state) { | |
2526 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2527 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2528 | break; |
2529 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2530 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2531 | break; |
2532 | default: | |
2533 | /* Ignore event */ | |
2534 | break; | |
2535 | } | |
608bcc6d MM |
2536 | } |
2537 | ||
4b51dae9 MM |
2538 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2539 | struct l2cap_ctrl *control) | |
2540 | { | |
2541 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2542 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2543 | } |
2544 | ||
f80842a8 MM |
2545 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2546 | struct l2cap_ctrl *control) | |
2547 | { | |
2548 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2549 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2550 | } |
2551 | ||
1da177e4 LT |
2552 | /* Copy frame to all raw sockets on that connection */ |
2553 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2554 | { | |
1da177e4 | 2555 | struct sk_buff *nskb; |
48454079 | 2556 | struct l2cap_chan *chan; |
1da177e4 LT |
2557 | |
2558 | BT_DBG("conn %p", conn); | |
2559 | ||
3df91ea2 | 2560 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2561 | |
3df91ea2 | 2562 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2563 | struct sock *sk = chan->sk; |
715ec005 | 2564 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2565 | continue; |
2566 | ||
2567 | /* Don't send frame to the socket it came from */ | |
2568 | if (skb->sk == sk) | |
2569 | continue; | |
af05b30b GP |
2570 | nskb = skb_clone(skb, GFP_ATOMIC); |
2571 | if (!nskb) | |
1da177e4 LT |
2572 | continue; |
2573 | ||
23070494 | 2574 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2575 | kfree_skb(nskb); |
2576 | } | |
3d57dc68 | 2577 | |
3df91ea2 | 2578 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2579 | } |
2580 | ||
2581 | /* ---- L2CAP signalling commands ---- */ | |
2582 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2583 | u8 code, u8 ident, u16 dlen, void *data) | |
2584 | { | |
2585 | struct sk_buff *skb, **frag; | |
2586 | struct l2cap_cmd_hdr *cmd; | |
2587 | struct l2cap_hdr *lh; | |
2588 | int len, count; | |
2589 | ||
af05b30b GP |
2590 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2591 | conn, code, ident, dlen); | |
1da177e4 LT |
2592 | |
2593 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2594 | count = min_t(unsigned int, conn->mtu, len); | |
2595 | ||
2596 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2597 | if (!skb) | |
2598 | return NULL; | |
2599 | ||
2600 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2601 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2602 | |
2603 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2604 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2605 | else |
ac73498c | 2606 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2607 | |
2608 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2609 | cmd->code = code; | |
2610 | cmd->ident = ident; | |
aca3192c | 2611 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2612 | |
2613 | if (dlen) { | |
2614 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2615 | memcpy(skb_put(skb, count), data, count); | |
2616 | data += count; | |
2617 | } | |
2618 | ||
2619 | len -= skb->len; | |
2620 | ||
2621 | /* Continuation fragments (no L2CAP header) */ | |
2622 | frag = &skb_shinfo(skb)->frag_list; | |
2623 | while (len) { | |
2624 | count = min_t(unsigned int, conn->mtu, len); | |
2625 | ||
2626 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2627 | if (!*frag) | |
2628 | goto fail; | |
2629 | ||
2630 | memcpy(skb_put(*frag, count), data, count); | |
2631 | ||
2632 | len -= count; | |
2633 | data += count; | |
2634 | ||
2635 | frag = &(*frag)->next; | |
2636 | } | |
2637 | ||
2638 | return skb; | |
2639 | ||
2640 | fail: | |
2641 | kfree_skb(skb); | |
2642 | return NULL; | |
2643 | } | |
2644 | ||
2645 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2646 | { | |
2647 | struct l2cap_conf_opt *opt = *ptr; | |
2648 | int len; | |
2649 | ||
2650 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2651 | *ptr += len; | |
2652 | ||
2653 | *type = opt->type; | |
2654 | *olen = opt->len; | |
2655 | ||
2656 | switch (opt->len) { | |
2657 | case 1: | |
2658 | *val = *((u8 *) opt->val); | |
2659 | break; | |
2660 | ||
2661 | case 2: | |
bfaaeb3e | 2662 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2663 | break; |
2664 | ||
2665 | case 4: | |
bfaaeb3e | 2666 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2667 | break; |
2668 | ||
2669 | default: | |
2670 | *val = (unsigned long) opt->val; | |
2671 | break; | |
2672 | } | |
2673 | ||
2674 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2675 | return len; | |
2676 | } | |
2677 | ||
1da177e4 LT |
2678 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2679 | { | |
2680 | struct l2cap_conf_opt *opt = *ptr; | |
2681 | ||
2682 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2683 | ||
2684 | opt->type = type; | |
2685 | opt->len = len; | |
2686 | ||
2687 | switch (len) { | |
2688 | case 1: | |
2689 | *((u8 *) opt->val) = val; | |
2690 | break; | |
2691 | ||
2692 | case 2: | |
4f8b691c | 2693 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2694 | break; |
2695 | ||
2696 | case 4: | |
4f8b691c | 2697 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2698 | break; |
2699 | ||
2700 | default: | |
2701 | memcpy(opt->val, (void *) val, len); | |
2702 | break; | |
2703 | } | |
2704 | ||
2705 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2706 | } | |
2707 | ||
f89cef09 AE |
2708 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2709 | { | |
2710 | struct l2cap_conf_efs efs; | |
2711 | ||
1ec918ce | 2712 | switch (chan->mode) { |
f89cef09 AE |
2713 | case L2CAP_MODE_ERTM: |
2714 | efs.id = chan->local_id; | |
2715 | efs.stype = chan->local_stype; | |
2716 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2717 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c AE |
2718 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2719 | efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2720 | break; |
2721 | ||
2722 | case L2CAP_MODE_STREAMING: | |
2723 | efs.id = 1; | |
2724 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2725 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2726 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2727 | efs.acc_lat = 0; | |
2728 | efs.flush_to = 0; | |
2729 | break; | |
2730 | ||
2731 | default: | |
2732 | return; | |
2733 | } | |
2734 | ||
2735 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2736 | (unsigned long) &efs); | |
2737 | } | |
2738 | ||
721c4181 | 2739 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2740 | { |
721c4181 | 2741 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2742 | ack_timer.work); |
2743 | u16 frames_to_ack; | |
c1b4f43b | 2744 | |
2fb9b3d4 GP |
2745 | BT_DBG("chan %p", chan); |
2746 | ||
6be36555 AE |
2747 | l2cap_chan_lock(chan); |
2748 | ||
0362520b MM |
2749 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2750 | chan->last_acked_seq); | |
6be36555 | 2751 | |
0362520b MM |
2752 | if (frames_to_ack) |
2753 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2754 | |
0362520b | 2755 | l2cap_chan_unlock(chan); |
09bfb2ee | 2756 | l2cap_chan_put(chan); |
c1b4f43b GP |
2757 | } |
2758 | ||
3c588192 | 2759 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2760 | { |
3c588192 MM |
2761 | int err; |
2762 | ||
105bdf9e MM |
2763 | chan->next_tx_seq = 0; |
2764 | chan->expected_tx_seq = 0; | |
42e5c802 | 2765 | chan->expected_ack_seq = 0; |
6a026610 | 2766 | chan->unacked_frames = 0; |
42e5c802 | 2767 | chan->buffer_seq = 0; |
6a026610 | 2768 | chan->frames_sent = 0; |
105bdf9e MM |
2769 | chan->last_acked_seq = 0; |
2770 | chan->sdu = NULL; | |
2771 | chan->sdu_last_frag = NULL; | |
2772 | chan->sdu_len = 0; | |
2773 | ||
d34c34fb MM |
2774 | skb_queue_head_init(&chan->tx_q); |
2775 | ||
105bdf9e MM |
2776 | if (chan->mode != L2CAP_MODE_ERTM) |
2777 | return 0; | |
2778 | ||
2779 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2780 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2781 | |
721c4181 GP |
2782 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2783 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2784 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2785 | |
f1c6775b | 2786 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2787 | |
3c588192 MM |
2788 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2789 | if (err < 0) | |
2790 | return err; | |
2791 | ||
9dc9affc MM |
2792 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2793 | if (err < 0) | |
2794 | l2cap_seq_list_free(&chan->srej_list); | |
2795 | ||
2796 | return err; | |
0565c1c2 GP |
2797 | } |
2798 | ||
f2fcfcd6 GP |
2799 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2800 | { | |
2801 | switch (mode) { | |
2802 | case L2CAP_MODE_STREAMING: | |
2803 | case L2CAP_MODE_ERTM: | |
2804 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2805 | return mode; | |
2806 | /* fall through */ | |
2807 | default: | |
2808 | return L2CAP_MODE_BASIC; | |
2809 | } | |
2810 | } | |
2811 | ||
6327eb98 AE |
2812 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2813 | { | |
2814 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2815 | } | |
2816 | ||
f89cef09 AE |
2817 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2818 | { | |
2819 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2820 | } | |
2821 | ||
6327eb98 AE |
2822 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2823 | { | |
2824 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2825 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2826 | /* use extended control field */ |
2827 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2828 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2829 | } else { | |
6327eb98 AE |
2830 | chan->tx_win = min_t(u16, chan->tx_win, |
2831 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2832 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2833 | } | |
6327eb98 AE |
2834 | } |
2835 | ||
710f9b0a | 2836 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2837 | { |
1da177e4 | 2838 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2839 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2840 | void *ptr = req->data; |
c8f79162 | 2841 | u16 size; |
1da177e4 | 2842 | |
49208c9c | 2843 | BT_DBG("chan %p", chan); |
1da177e4 | 2844 | |
73ffa904 | 2845 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2846 | goto done; |
2847 | ||
0c1bc5c6 | 2848 | switch (chan->mode) { |
f2fcfcd6 GP |
2849 | case L2CAP_MODE_STREAMING: |
2850 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2851 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2852 | break; |
85eb53c6 | 2853 | |
f89cef09 AE |
2854 | if (__l2cap_efs_supported(chan)) |
2855 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2856 | ||
2ba13ed6 | 2857 | /* fall through */ |
f2fcfcd6 | 2858 | default: |
8c1d787b | 2859 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2860 | break; |
2861 | } | |
2862 | ||
2863 | done: | |
0c1bc5c6 GP |
2864 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2865 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2866 | |
0c1bc5c6 | 2867 | switch (chan->mode) { |
65c7c491 | 2868 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2869 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2870 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2871 | break; |
2872 | ||
62547752 GP |
2873 | rfc.mode = L2CAP_MODE_BASIC; |
2874 | rfc.txwin_size = 0; | |
2875 | rfc.max_transmit = 0; | |
2876 | rfc.retrans_timeout = 0; | |
2877 | rfc.monitor_timeout = 0; | |
2878 | rfc.max_pdu_size = 0; | |
2879 | ||
63406504 GP |
2880 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2881 | (unsigned long) &rfc); | |
65c7c491 MH |
2882 | break; |
2883 | ||
2884 | case L2CAP_MODE_ERTM: | |
2885 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2886 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2887 | rfc.retrans_timeout = 0; |
2888 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2889 | |
2890 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2891 | L2CAP_EXT_HDR_SIZE - | |
2892 | L2CAP_SDULEN_SIZE - | |
2893 | L2CAP_FCS_SIZE); | |
2894 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2895 | |
6327eb98 AE |
2896 | l2cap_txwin_setup(chan); |
2897 | ||
2898 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2899 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2900 | |
63406504 GP |
2901 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2902 | (unsigned long) &rfc); | |
2903 | ||
f89cef09 AE |
2904 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2905 | l2cap_add_opt_efs(&ptr, chan); | |
2906 | ||
8c1d787b | 2907 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2908 | break; |
2909 | ||
47d1ec61 | 2910 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2911 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2912 | chan->fcs = L2CAP_FCS_NONE; |
2913 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2914 | } |
6327eb98 AE |
2915 | |
2916 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2917 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2918 | chan->tx_win); | |
f2fcfcd6 GP |
2919 | break; |
2920 | ||
2921 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2922 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2923 | rfc.mode = L2CAP_MODE_STREAMING; |
2924 | rfc.txwin_size = 0; | |
2925 | rfc.max_transmit = 0; | |
2926 | rfc.retrans_timeout = 0; | |
2927 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2928 | |
2929 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2930 | L2CAP_EXT_HDR_SIZE - | |
2931 | L2CAP_SDULEN_SIZE - | |
2932 | L2CAP_FCS_SIZE); | |
2933 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2934 | |
63406504 GP |
2935 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2936 | (unsigned long) &rfc); | |
2937 | ||
f89cef09 AE |
2938 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2939 | l2cap_add_opt_efs(&ptr, chan); | |
2940 | ||
8c1d787b | 2941 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2942 | break; |
2943 | ||
47d1ec61 | 2944 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2945 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2946 | chan->fcs = L2CAP_FCS_NONE; |
2947 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2948 | } |
65c7c491 MH |
2949 | break; |
2950 | } | |
1da177e4 | 2951 | |
fe4128e0 | 2952 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2953 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2954 | |
2955 | return ptr - data; | |
2956 | } | |
2957 | ||
73ffa904 | 2958 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2959 | { |
5dee9e7c MH |
2960 | struct l2cap_conf_rsp *rsp = data; |
2961 | void *ptr = rsp->data; | |
73ffa904 GP |
2962 | void *req = chan->conf_req; |
2963 | int len = chan->conf_len; | |
5dee9e7c MH |
2964 | int type, hint, olen; |
2965 | unsigned long val; | |
6464f35f | 2966 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2967 | struct l2cap_conf_efs efs; |
2968 | u8 remote_efs = 0; | |
861d6882 | 2969 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2970 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2971 | u16 size; |
1da177e4 | 2972 | |
73ffa904 | 2973 | BT_DBG("chan %p", chan); |
820ae1b8 | 2974 | |
5dee9e7c MH |
2975 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2976 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2977 | |
589d2746 | 2978 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2979 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2980 | |
2981 | switch (type) { | |
2982 | case L2CAP_CONF_MTU: | |
861d6882 | 2983 | mtu = val; |
5dee9e7c MH |
2984 | break; |
2985 | ||
2986 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2987 | chan->flush_to = val; |
5dee9e7c MH |
2988 | break; |
2989 | ||
2990 | case L2CAP_CONF_QOS: | |
2991 | break; | |
2992 | ||
6464f35f MH |
2993 | case L2CAP_CONF_RFC: |
2994 | if (olen == sizeof(rfc)) | |
2995 | memcpy(&rfc, (void *) val, olen); | |
2996 | break; | |
2997 | ||
fcc203c3 GP |
2998 | case L2CAP_CONF_FCS: |
2999 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3000 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3001 | break; |
fcc203c3 | 3002 | |
42dceae2 AE |
3003 | case L2CAP_CONF_EFS: |
3004 | remote_efs = 1; | |
3005 | if (olen == sizeof(efs)) | |
3006 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3007 | break; |
3008 | ||
6327eb98 AE |
3009 | case L2CAP_CONF_EWS: |
3010 | if (!enable_hs) | |
3011 | return -ECONNREFUSED; | |
fcc203c3 | 3012 | |
6327eb98 AE |
3013 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3014 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3015 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3016 | chan->remote_tx_win = val; |
fcc203c3 GP |
3017 | break; |
3018 | ||
5dee9e7c MH |
3019 | default: |
3020 | if (hint) | |
3021 | break; | |
3022 | ||
3023 | result = L2CAP_CONF_UNKNOWN; | |
3024 | *((u8 *) ptr++) = type; | |
3025 | break; | |
3026 | } | |
3027 | } | |
3028 | ||
73ffa904 | 3029 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3030 | goto done; |
3031 | ||
0c1bc5c6 | 3032 | switch (chan->mode) { |
f2fcfcd6 GP |
3033 | case L2CAP_MODE_STREAMING: |
3034 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3035 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3036 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 3037 | chan->conn->feat_mask); |
85eb53c6 GP |
3038 | break; |
3039 | } | |
3040 | ||
42dceae2 AE |
3041 | if (remote_efs) { |
3042 | if (__l2cap_efs_supported(chan)) | |
3043 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3044 | else | |
3045 | return -ECONNREFUSED; | |
3046 | } | |
3047 | ||
0c1bc5c6 | 3048 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3049 | return -ECONNREFUSED; |
742e519b | 3050 | |
f2fcfcd6 | 3051 | break; |
f2fcfcd6 GP |
3052 | } |
3053 | ||
3054 | done: | |
0c1bc5c6 | 3055 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3056 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3057 | rfc.mode = chan->mode; |
f2fcfcd6 | 3058 | |
73ffa904 | 3059 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3060 | return -ECONNREFUSED; |
3061 | ||
3062 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3063 | sizeof(rfc), (unsigned long) &rfc); | |
3064 | } | |
3065 | ||
5dee9e7c MH |
3066 | if (result == L2CAP_CONF_SUCCESS) { |
3067 | /* Configure output options and let the other side know | |
3068 | * which ones we don't like. */ | |
3069 | ||
f2fcfcd6 GP |
3070 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3071 | result = L2CAP_CONF_UNACCEPT; | |
3072 | else { | |
0c1bc5c6 | 3073 | chan->omtu = mtu; |
c1360a1c | 3074 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3075 | } |
0c1bc5c6 | 3076 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3077 | |
42dceae2 AE |
3078 | if (remote_efs) { |
3079 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3080 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3081 | efs.stype != chan->local_stype) { | |
3082 | ||
3083 | result = L2CAP_CONF_UNACCEPT; | |
3084 | ||
3085 | if (chan->num_conf_req >= 1) | |
3086 | return -ECONNREFUSED; | |
3087 | ||
3088 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3089 | sizeof(efs), |
42dceae2 | 3090 | (unsigned long) &efs); |
0e8b207e | 3091 | } else { |
3e6b3b95 | 3092 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3093 | result = L2CAP_CONF_PENDING; |
3094 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3095 | } |
3096 | } | |
3097 | ||
f2fcfcd6 GP |
3098 | switch (rfc.mode) { |
3099 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3100 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3101 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3102 | break; |
3103 | ||
3104 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3105 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3106 | chan->remote_tx_win = rfc.txwin_size; | |
3107 | else | |
3108 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3109 | |
2c03a7a4 | 3110 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3111 | |
c8f79162 AE |
3112 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3113 | chan->conn->mtu - | |
3114 | L2CAP_EXT_HDR_SIZE - | |
3115 | L2CAP_SDULEN_SIZE - | |
3116 | L2CAP_FCS_SIZE); | |
3117 | rfc.max_pdu_size = cpu_to_le16(size); | |
3118 | chan->remote_mps = size; | |
f2fcfcd6 | 3119 | |
10467e9e | 3120 | rfc.retrans_timeout = |
4fd21a88 | 3121 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3122 | rfc.monitor_timeout = |
4fd21a88 | 3123 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3124 | |
c1360a1c | 3125 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3126 | |
3127 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3128 | sizeof(rfc), (unsigned long) &rfc); | |
3129 | ||
42dceae2 AE |
3130 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3131 | chan->remote_id = efs.id; | |
3132 | chan->remote_stype = efs.stype; | |
3133 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3134 | chan->remote_flush_to = | |
3135 | le32_to_cpu(efs.flush_to); | |
3136 | chan->remote_acc_lat = | |
3137 | le32_to_cpu(efs.acc_lat); | |
3138 | chan->remote_sdu_itime = | |
3139 | le32_to_cpu(efs.sdu_itime); | |
3140 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3141 | sizeof(efs), (unsigned long) &efs); | |
3142 | } | |
f2fcfcd6 GP |
3143 | break; |
3144 | ||
3145 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3146 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3147 | chan->conn->mtu - | |
3148 | L2CAP_EXT_HDR_SIZE - | |
3149 | L2CAP_SDULEN_SIZE - | |
3150 | L2CAP_FCS_SIZE); | |
3151 | rfc.max_pdu_size = cpu_to_le16(size); | |
3152 | chan->remote_mps = size; | |
f2fcfcd6 | 3153 | |
c1360a1c | 3154 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3155 | |
3156 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3157 | sizeof(rfc), (unsigned long) &rfc); | |
3158 | ||
f2fcfcd6 GP |
3159 | break; |
3160 | ||
3161 | default: | |
5dee9e7c | 3162 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3163 | |
6464f35f | 3164 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3165 | rfc.mode = chan->mode; |
f2fcfcd6 | 3166 | } |
6464f35f | 3167 | |
f2fcfcd6 | 3168 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3169 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3170 | } |
fe4128e0 | 3171 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3172 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3173 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3174 | |
3175 | return ptr - data; | |
1da177e4 LT |
3176 | } |
3177 | ||
b4450035 | 3178 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3179 | { |
f2fcfcd6 GP |
3180 | struct l2cap_conf_req *req = data; |
3181 | void *ptr = req->data; | |
3182 | int type, olen; | |
3183 | unsigned long val; | |
36e999a8 | 3184 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3185 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3186 | |
fe4128e0 | 3187 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3188 | |
3189 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3190 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3191 | ||
3192 | switch (type) { | |
3193 | case L2CAP_CONF_MTU: | |
3194 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3195 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3196 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3197 | } else |
0c1bc5c6 GP |
3198 | chan->imtu = val; |
3199 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3200 | break; |
3201 | ||
3202 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3203 | chan->flush_to = val; |
f2fcfcd6 | 3204 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3205 | 2, chan->flush_to); |
f2fcfcd6 GP |
3206 | break; |
3207 | ||
3208 | case L2CAP_CONF_RFC: | |
3209 | if (olen == sizeof(rfc)) | |
3210 | memcpy(&rfc, (void *)val, olen); | |
3211 | ||
c1360a1c | 3212 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3213 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3214 | return -ECONNREFUSED; |
3215 | ||
47d1ec61 | 3216 | chan->fcs = 0; |
f2fcfcd6 GP |
3217 | |
3218 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3219 | sizeof(rfc), (unsigned long) &rfc); | |
3220 | break; | |
6327eb98 AE |
3221 | |
3222 | case L2CAP_CONF_EWS: | |
3223 | chan->tx_win = min_t(u16, val, | |
3224 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3225 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3226 | chan->tx_win); | |
6327eb98 | 3227 | break; |
66af7aaf AE |
3228 | |
3229 | case L2CAP_CONF_EFS: | |
3230 | if (olen == sizeof(efs)) | |
3231 | memcpy(&efs, (void *)val, olen); | |
3232 | ||
3233 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3234 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3235 | efs.stype != chan->local_stype) | |
3236 | return -ECONNREFUSED; | |
3237 | ||
3238 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3239 | sizeof(efs), (unsigned long) &efs); | |
3240 | break; | |
f2fcfcd6 GP |
3241 | } |
3242 | } | |
3243 | ||
0c1bc5c6 | 3244 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3245 | return -ECONNREFUSED; |
3246 | ||
0c1bc5c6 | 3247 | chan->mode = rfc.mode; |
6c2ea7a8 | 3248 | |
0e8b207e | 3249 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3250 | switch (rfc.mode) { |
3251 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3252 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3253 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3254 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3255 | |
3256 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3257 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3258 | chan->local_sdu_itime = | |
3259 | le32_to_cpu(efs.sdu_itime); | |
3260 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3261 | chan->local_flush_to = | |
3262 | le32_to_cpu(efs.flush_to); | |
3263 | } | |
f2fcfcd6 | 3264 | break; |
66af7aaf | 3265 | |
f2fcfcd6 | 3266 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3267 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3268 | } |
3269 | } | |
3270 | ||
fe4128e0 | 3271 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3272 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3273 | |
3274 | return ptr - data; | |
3275 | } | |
3276 | ||
fe4128e0 | 3277 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3278 | { |
3279 | struct l2cap_conf_rsp *rsp = data; | |
3280 | void *ptr = rsp->data; | |
1da177e4 | 3281 | |
fe4128e0 | 3282 | BT_DBG("chan %p", chan); |
1da177e4 | 3283 | |
fe4128e0 | 3284 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3285 | rsp->result = cpu_to_le16(result); |
aca3192c | 3286 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3287 | |
3288 | return ptr - data; | |
3289 | } | |
3290 | ||
8c1d787b | 3291 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3292 | { |
3293 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3294 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3295 | u8 buf[128]; |
3296 | ||
fe4128e0 GP |
3297 | rsp.scid = cpu_to_le16(chan->dcid); |
3298 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3299 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3300 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3301 | l2cap_send_cmd(conn, chan->ident, |
3302 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3303 | ||
c1360a1c | 3304 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3305 | return; |
3306 | ||
710f9b0a GP |
3307 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3308 | l2cap_build_conf_req(chan, buf), buf); | |
3309 | chan->num_conf_req++; | |
3310 | } | |
3311 | ||
47d1ec61 | 3312 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3313 | { |
7b1c0049 GP |
3314 | int type, olen; |
3315 | unsigned long val; | |
3316 | struct l2cap_conf_rfc rfc; | |
3317 | ||
47d1ec61 | 3318 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3319 | |
0c1bc5c6 | 3320 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3321 | return; |
3322 | ||
3323 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3324 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3325 | ||
3326 | switch (type) { | |
3327 | case L2CAP_CONF_RFC: | |
3328 | if (olen == sizeof(rfc)) | |
3329 | memcpy(&rfc, (void *)val, olen); | |
3330 | goto done; | |
3331 | } | |
3332 | } | |
3333 | ||
36e999a8 MM |
3334 | /* Use sane default values in case a misbehaving remote device |
3335 | * did not send an RFC option. | |
3336 | */ | |
3337 | rfc.mode = chan->mode; | |
ac73498c AE |
3338 | rfc.retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3339 | rfc.monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36e999a8 MM |
3340 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); |
3341 | ||
3342 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3343 | ||
7b1c0049 GP |
3344 | done: |
3345 | switch (rfc.mode) { | |
3346 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3347 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3348 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3349 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3350 | break; |
3351 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3352 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3353 | } |
3354 | } | |
3355 | ||
4e8402a3 MH |
3356 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3357 | { | |
e2fd318e | 3358 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3359 | |
e2fd318e | 3360 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3361 | return 0; |
3362 | ||
3363 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3364 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3365 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3366 | |
3367 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3368 | conn->info_ident = 0; |
984947dc | 3369 | |
4e8402a3 MH |
3370 | l2cap_conn_start(conn); |
3371 | } | |
3372 | ||
3373 | return 0; | |
3374 | } | |
3375 | ||
1da177e4 LT |
3376 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3377 | { | |
1da177e4 LT |
3378 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3379 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3380 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3381 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3382 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3383 | |
3384 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3385 | __le16 psm = req->psm; |
1da177e4 | 3386 | |
097db76c | 3387 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3388 | |
3389 | /* Check if we have socket listening on psm */ | |
c2287681 | 3390 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3391 | if (!pchan) { |
1da177e4 LT |
3392 | result = L2CAP_CR_BAD_PSM; |
3393 | goto sendresp; | |
3394 | } | |
3395 | ||
23691d75 GP |
3396 | parent = pchan->sk; |
3397 | ||
3df91ea2 | 3398 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3399 | lock_sock(parent); |
e0f0cb56 | 3400 | |
e7c29cb1 | 3401 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3402 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3403 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3404 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3405 | result = L2CAP_CR_SEC_BLOCK; |
3406 | goto response; | |
3407 | } | |
3408 | ||
1da177e4 LT |
3409 | result = L2CAP_CR_NO_MEM; |
3410 | ||
3411 | /* Check for backlog size */ | |
3412 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 3413 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
3414 | goto response; |
3415 | } | |
3416 | ||
80808e43 GP |
3417 | chan = pchan->ops->new_connection(pchan->data); |
3418 | if (!chan) | |
1da177e4 LT |
3419 | goto response; |
3420 | ||
80808e43 GP |
3421 | sk = chan->sk; |
3422 | ||
1da177e4 | 3423 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3424 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3425 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3426 | chan->ops->close(chan->data); |
1da177e4 LT |
3427 | goto response; |
3428 | } | |
3429 | ||
3430 | hci_conn_hold(conn->hcon); | |
3431 | ||
1da177e4 LT |
3432 | bacpy(&bt_sk(sk)->src, conn->src); |
3433 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3434 | chan->psm = psm; |
3435 | chan->dcid = scid; | |
1da177e4 | 3436 | |
d1010240 GP |
3437 | bt_accept_enqueue(parent, sk); |
3438 | ||
6be36555 | 3439 | __l2cap_chan_add(conn, chan); |
48454079 | 3440 | |
fe4128e0 | 3441 | dcid = chan->scid; |
1da177e4 | 3442 | |
c9b66675 | 3443 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3444 | |
fc7f8a7e | 3445 | chan->ident = cmd->ident; |
1da177e4 | 3446 | |
984947dc | 3447 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3448 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3449 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3450 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3451 | result = L2CAP_CR_PEND; |
3452 | status = L2CAP_CS_AUTHOR_PEND; | |
3453 | parent->sk_data_ready(parent, 0); | |
3454 | } else { | |
0e587be7 | 3455 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3456 | result = L2CAP_CR_SUCCESS; |
3457 | status = L2CAP_CS_NO_INFO; | |
3458 | } | |
79d554a6 | 3459 | } else { |
0e587be7 | 3460 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3461 | result = L2CAP_CR_PEND; |
3462 | status = L2CAP_CS_AUTHEN_PEND; | |
3463 | } | |
3464 | } else { | |
0e587be7 | 3465 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3466 | result = L2CAP_CR_PEND; |
3467 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3468 | } |
3469 | ||
1da177e4 | 3470 | response: |
aa2ac881 | 3471 | release_sock(parent); |
3df91ea2 | 3472 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3473 | |
3474 | sendresp: | |
aca3192c YH |
3475 | rsp.scid = cpu_to_le16(scid); |
3476 | rsp.dcid = cpu_to_le16(dcid); | |
3477 | rsp.result = cpu_to_le16(result); | |
3478 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3479 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3480 | |
3481 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3482 | struct l2cap_info_req info; | |
ac73498c | 3483 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3484 | |
3485 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3486 | conn->info_ident = l2cap_get_ident(conn); | |
3487 | ||
ba13ccd9 | 3488 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3489 | |
3490 | l2cap_send_cmd(conn, conn->info_ident, | |
3491 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3492 | } | |
3493 | ||
c1360a1c | 3494 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3495 | result == L2CAP_CR_SUCCESS) { |
3496 | u8 buf[128]; | |
c1360a1c | 3497 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3498 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3499 | l2cap_build_conf_req(chan, buf), buf); |
3500 | chan->num_conf_req++; | |
e9aeb2dd GP |
3501 | } |
3502 | ||
1da177e4 LT |
3503 | return 0; |
3504 | } | |
3505 | ||
3506 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3507 | { | |
3508 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3509 | u16 scid, dcid, result, status; | |
48454079 | 3510 | struct l2cap_chan *chan; |
1da177e4 | 3511 | u8 req[128]; |
3df91ea2 | 3512 | int err; |
1da177e4 LT |
3513 | |
3514 | scid = __le16_to_cpu(rsp->scid); | |
3515 | dcid = __le16_to_cpu(rsp->dcid); | |
3516 | result = __le16_to_cpu(rsp->result); | |
3517 | status = __le16_to_cpu(rsp->status); | |
3518 | ||
1b009c98 AE |
3519 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3520 | dcid, scid, result, status); | |
1da177e4 | 3521 | |
3df91ea2 AE |
3522 | mutex_lock(&conn->chan_lock); |
3523 | ||
1da177e4 | 3524 | if (scid) { |
3df91ea2 AE |
3525 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3526 | if (!chan) { | |
3527 | err = -EFAULT; | |
3528 | goto unlock; | |
3529 | } | |
1da177e4 | 3530 | } else { |
3df91ea2 AE |
3531 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3532 | if (!chan) { | |
3533 | err = -EFAULT; | |
3534 | goto unlock; | |
3535 | } | |
1da177e4 LT |
3536 | } |
3537 | ||
3df91ea2 AE |
3538 | err = 0; |
3539 | ||
6be36555 | 3540 | l2cap_chan_lock(chan); |
48454079 | 3541 | |
1da177e4 LT |
3542 | switch (result) { |
3543 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3544 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3545 | chan->ident = 0; |
fe4128e0 | 3546 | chan->dcid = dcid; |
c1360a1c | 3547 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3548 | |
c1360a1c | 3549 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3550 | break; |
3551 | ||
1da177e4 | 3552 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3553 | l2cap_build_conf_req(chan, req), req); |
3554 | chan->num_conf_req++; | |
1da177e4 LT |
3555 | break; |
3556 | ||
3557 | case L2CAP_CR_PEND: | |
c1360a1c | 3558 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3559 | break; |
3560 | ||
3561 | default: | |
48454079 | 3562 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3563 | break; |
3564 | } | |
3565 | ||
6be36555 | 3566 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3567 | |
3568 | unlock: | |
3569 | mutex_unlock(&conn->chan_lock); | |
3570 | ||
3571 | return err; | |
1da177e4 LT |
3572 | } |
3573 | ||
47d1ec61 | 3574 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3575 | { |
3576 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3577 | * sides request it. | |
3578 | */ | |
0c1bc5c6 | 3579 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3580 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3581 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3582 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3583 | } |
3584 | ||
88219a0f | 3585 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3586 | { |
3587 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3588 | u16 dcid, flags; | |
3589 | u8 rsp[64]; | |
48454079 | 3590 | struct l2cap_chan *chan; |
3c588192 | 3591 | int len, err = 0; |
1da177e4 LT |
3592 | |
3593 | dcid = __le16_to_cpu(req->dcid); | |
3594 | flags = __le16_to_cpu(req->flags); | |
3595 | ||
3596 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3597 | ||
baa7e1fa | 3598 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3599 | if (!chan) |
1da177e4 LT |
3600 | return -ENOENT; |
3601 | ||
033b1142 | 3602 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3603 | struct l2cap_cmd_rej_cid rej; |
3604 | ||
ac73498c | 3605 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3606 | rej.scid = cpu_to_le16(chan->scid); |
3607 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3608 | |
df6bd743 GP |
3609 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3610 | sizeof(rej), &rej); | |
354f60a9 | 3611 | goto unlock; |
df6bd743 | 3612 | } |
354f60a9 | 3613 | |
5dee9e7c | 3614 | /* Reject if config buffer is too small. */ |
88219a0f | 3615 | len = cmd_len - sizeof(*req); |
7ac28817 | 3616 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3617 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3618 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3619 | L2CAP_CONF_REJECT, flags), rsp); |
3620 | goto unlock; | |
3621 | } | |
3622 | ||
3623 | /* Store config. */ | |
73ffa904 GP |
3624 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3625 | chan->conf_len += len; | |
1da177e4 | 3626 | |
59e54bd1 | 3627 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3628 | /* Incomplete config. Send empty response. */ |
3629 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3630 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3631 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3632 | goto unlock; |
3633 | } | |
3634 | ||
3635 | /* Complete config. */ | |
73ffa904 | 3636 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3637 | if (len < 0) { |
e92c8e70 | 3638 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3639 | goto unlock; |
f2fcfcd6 | 3640 | } |
1da177e4 | 3641 | |
5dee9e7c | 3642 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3643 | chan->num_conf_rsp++; |
5dee9e7c | 3644 | |
5dee9e7c | 3645 | /* Reset config buffer. */ |
73ffa904 | 3646 | chan->conf_len = 0; |
5dee9e7c | 3647 | |
c1360a1c | 3648 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3649 | goto unlock; |
3650 | ||
c1360a1c | 3651 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3652 | set_default_fcs(chan); |
fcc203c3 | 3653 | |
105bdf9e MM |
3654 | if (chan->mode == L2CAP_MODE_ERTM || |
3655 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3656 | err = l2cap_ertm_init(chan); |
3657 | ||
3658 | if (err < 0) | |
3659 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3660 | else | |
3661 | l2cap_chan_ready(chan); | |
0565c1c2 | 3662 | |
876d9484 MH |
3663 | goto unlock; |
3664 | } | |
3665 | ||
c1360a1c | 3666 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3667 | u8 buf[64]; |
1da177e4 | 3668 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3669 | l2cap_build_conf_req(chan, buf), buf); |
3670 | chan->num_conf_req++; | |
1da177e4 LT |
3671 | } |
3672 | ||
0e8b207e AE |
3673 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3674 | Conf Rsp PENDING in the code above */ | |
3675 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3676 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3677 | ||
3678 | /* check compatibility */ | |
3679 | ||
3680 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3681 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3682 | ||
3683 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3684 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3685 | L2CAP_CONF_SUCCESS, flags), rsp); |
0e8b207e AE |
3686 | } |
3687 | ||
1da177e4 | 3688 | unlock: |
6be36555 | 3689 | l2cap_chan_unlock(chan); |
3c588192 | 3690 | return err; |
1da177e4 LT |
3691 | } |
3692 | ||
3693 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3694 | { | |
3695 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3696 | u16 scid, flags, result; | |
48454079 | 3697 | struct l2cap_chan *chan; |
61386cba | 3698 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3699 | int err = 0; |
1da177e4 LT |
3700 | |
3701 | scid = __le16_to_cpu(rsp->scid); | |
3702 | flags = __le16_to_cpu(rsp->flags); | |
3703 | result = __le16_to_cpu(rsp->result); | |
3704 | ||
61386cba AE |
3705 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3706 | result, len); | |
1da177e4 | 3707 | |
baa7e1fa | 3708 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3709 | if (!chan) |
1da177e4 LT |
3710 | return 0; |
3711 | ||
3712 | switch (result) { | |
3713 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3714 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3715 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3716 | break; |
3717 | ||
0e8b207e AE |
3718 | case L2CAP_CONF_PENDING: |
3719 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3720 | ||
3721 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3722 | char buf[64]; | |
3723 | ||
3724 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3725 | buf, &result); | |
3726 | if (len < 0) { | |
3727 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3728 | goto done; | |
3729 | } | |
3730 | ||
3731 | /* check compatibility */ | |
3732 | ||
3733 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3734 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3735 | ||
3736 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3737 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3738 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3739 | } | |
3740 | goto done; | |
3741 | ||
1da177e4 | 3742 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3743 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3744 | char req[64]; |
3745 | ||
c2c77ec8 | 3746 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3747 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3748 | goto done; |
3749 | } | |
3750 | ||
f2fcfcd6 GP |
3751 | /* throw out any old stored conf requests */ |
3752 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3753 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3754 | req, &result); | |
f2fcfcd6 | 3755 | if (len < 0) { |
e92c8e70 | 3756 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3757 | goto done; |
3758 | } | |
3759 | ||
3760 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3761 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3762 | chan->num_conf_req++; |
f2fcfcd6 GP |
3763 | if (result != L2CAP_CONF_SUCCESS) |
3764 | goto done; | |
3765 | break; | |
1da177e4 LT |
3766 | } |
3767 | ||
8e87d142 | 3768 | default: |
6be36555 | 3769 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3770 | |
ba13ccd9 | 3771 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3772 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3773 | goto done; |
3774 | } | |
3775 | ||
59e54bd1 | 3776 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3777 | goto done; |
3778 | ||
c1360a1c | 3779 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3780 | |
c1360a1c | 3781 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3782 | set_default_fcs(chan); |
fcc203c3 | 3783 | |
105bdf9e MM |
3784 | if (chan->mode == L2CAP_MODE_ERTM || |
3785 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3786 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3787 | |
3c588192 MM |
3788 | if (err < 0) |
3789 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3790 | else | |
3791 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3792 | } |
3793 | ||
3794 | done: | |
6be36555 | 3795 | l2cap_chan_unlock(chan); |
3c588192 | 3796 | return err; |
1da177e4 LT |
3797 | } |
3798 | ||
3799 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3800 | { | |
3801 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3802 | struct l2cap_disconn_rsp rsp; | |
3803 | u16 dcid, scid; | |
48454079 | 3804 | struct l2cap_chan *chan; |
1da177e4 LT |
3805 | struct sock *sk; |
3806 | ||
3807 | scid = __le16_to_cpu(req->scid); | |
3808 | dcid = __le16_to_cpu(req->dcid); | |
3809 | ||
3810 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3811 | ||
3df91ea2 AE |
3812 | mutex_lock(&conn->chan_lock); |
3813 | ||
3814 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3815 | if (!chan) { | |
3816 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3817 | return 0; |
3df91ea2 | 3818 | } |
1da177e4 | 3819 | |
6be36555 AE |
3820 | l2cap_chan_lock(chan); |
3821 | ||
48454079 GP |
3822 | sk = chan->sk; |
3823 | ||
fe4128e0 GP |
3824 | rsp.dcid = cpu_to_le16(chan->scid); |
3825 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3826 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3827 | ||
6be36555 | 3828 | lock_sock(sk); |
1da177e4 | 3829 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3830 | release_sock(sk); |
1da177e4 | 3831 | |
61d6ef3e | 3832 | l2cap_chan_hold(chan); |
48454079 | 3833 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3834 | |
3835 | l2cap_chan_unlock(chan); | |
1da177e4 | 3836 | |
ba3bd0ee | 3837 | chan->ops->close(chan->data); |
61d6ef3e | 3838 | l2cap_chan_put(chan); |
3df91ea2 AE |
3839 | |
3840 | mutex_unlock(&conn->chan_lock); | |
3841 | ||
1da177e4 LT |
3842 | return 0; |
3843 | } | |
3844 | ||
3845 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3846 | { | |
3847 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3848 | u16 dcid, scid; | |
48454079 | 3849 | struct l2cap_chan *chan; |
1da177e4 LT |
3850 | |
3851 | scid = __le16_to_cpu(rsp->scid); | |
3852 | dcid = __le16_to_cpu(rsp->dcid); | |
3853 | ||
3854 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3855 | ||
3df91ea2 AE |
3856 | mutex_lock(&conn->chan_lock); |
3857 | ||
3858 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3859 | if (!chan) { | |
3860 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3861 | return 0; |
3df91ea2 | 3862 | } |
1da177e4 | 3863 | |
6be36555 | 3864 | l2cap_chan_lock(chan); |
48454079 | 3865 | |
61d6ef3e | 3866 | l2cap_chan_hold(chan); |
48454079 | 3867 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3868 | |
3869 | l2cap_chan_unlock(chan); | |
1da177e4 | 3870 | |
ba3bd0ee | 3871 | chan->ops->close(chan->data); |
61d6ef3e | 3872 | l2cap_chan_put(chan); |
3df91ea2 AE |
3873 | |
3874 | mutex_unlock(&conn->chan_lock); | |
3875 | ||
1da177e4 LT |
3876 | return 0; |
3877 | } | |
3878 | ||
3879 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3880 | { | |
3881 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3882 | u16 type; |
3883 | ||
3884 | type = __le16_to_cpu(req->type); | |
3885 | ||
3886 | BT_DBG("type 0x%4.4x", type); | |
3887 | ||
f0709e03 MH |
3888 | if (type == L2CAP_IT_FEAT_MASK) { |
3889 | u8 buf[8]; | |
44dd46de | 3890 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3891 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3892 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3893 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3894 | if (!disable_ertm) |
fcc203c3 GP |
3895 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3896 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3897 | if (enable_hs) |
6327eb98 AE |
3898 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3899 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3900 | |
1b7bf4ed | 3901 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3902 | l2cap_send_cmd(conn, cmd->ident, |
3903 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3904 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3905 | u8 buf[12]; | |
3906 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3907 | |
3908 | if (enable_hs) | |
3909 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3910 | else | |
3911 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3912 | ||
ac73498c AE |
3913 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3914 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3915 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3916 | l2cap_send_cmd(conn, cmd->ident, |
3917 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3918 | } else { |
3919 | struct l2cap_info_rsp rsp; | |
3920 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3921 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3922 | l2cap_send_cmd(conn, cmd->ident, |
3923 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3924 | } | |
1da177e4 LT |
3925 | |
3926 | return 0; | |
3927 | } | |
3928 | ||
3929 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3930 | { | |
3931 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3932 | u16 type, result; | |
3933 | ||
3934 | type = __le16_to_cpu(rsp->type); | |
3935 | result = __le16_to_cpu(rsp->result); | |
3936 | ||
3937 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3938 | ||
e90165be AE |
3939 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3940 | if (cmd->ident != conn->info_ident || | |
3941 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3942 | return 0; | |
3943 | ||
17cd3f37 | 3944 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3945 | |
adb08ede VT |
3946 | if (result != L2CAP_IR_SUCCESS) { |
3947 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3948 | conn->info_ident = 0; | |
3949 | ||
3950 | l2cap_conn_start(conn); | |
3951 | ||
3952 | return 0; | |
3953 | } | |
3954 | ||
978c93b9 AE |
3955 | switch (type) { |
3956 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3957 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3958 | |
47ec1dcd | 3959 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3960 | struct l2cap_info_req req; |
ac73498c | 3961 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3962 | |
3963 | conn->info_ident = l2cap_get_ident(conn); | |
3964 | ||
3965 | l2cap_send_cmd(conn, conn->info_ident, | |
3966 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3967 | } else { | |
3968 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3969 | conn->info_ident = 0; | |
3970 | ||
3971 | l2cap_conn_start(conn); | |
3972 | } | |
978c93b9 AE |
3973 | break; |
3974 | ||
3975 | case L2CAP_IT_FIXED_CHAN: | |
3976 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3977 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3978 | conn->info_ident = 0; |
984947dc MH |
3979 | |
3980 | l2cap_conn_start(conn); | |
978c93b9 | 3981 | break; |
984947dc | 3982 | } |
4e8402a3 | 3983 | |
1da177e4 LT |
3984 | return 0; |
3985 | } | |
3986 | ||
f94ff6ff MM |
3987 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3988 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3989 | void *data) | |
3990 | { | |
3991 | struct l2cap_create_chan_req *req = data; | |
3992 | struct l2cap_create_chan_rsp rsp; | |
3993 | u16 psm, scid; | |
3994 | ||
3995 | if (cmd_len != sizeof(*req)) | |
3996 | return -EPROTO; | |
3997 | ||
3998 | if (!enable_hs) | |
3999 | return -EINVAL; | |
4000 | ||
4001 | psm = le16_to_cpu(req->psm); | |
4002 | scid = le16_to_cpu(req->scid); | |
4003 | ||
4004 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
4005 | ||
4006 | /* Placeholder: Always reject */ | |
4007 | rsp.dcid = 0; | |
4008 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
4009 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4010 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
4011 | |
4012 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4013 | sizeof(rsp), &rsp); | |
4014 | ||
4015 | return 0; | |
4016 | } | |
4017 | ||
4018 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
4019 | struct l2cap_cmd_hdr *cmd, void *data) | |
4020 | { | |
4021 | BT_DBG("conn %p", conn); | |
4022 | ||
4023 | return l2cap_connect_rsp(conn, cmd, data); | |
4024 | } | |
4025 | ||
8d5a04a1 MM |
4026 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
4027 | u16 icid, u16 result) | |
4028 | { | |
4029 | struct l2cap_move_chan_rsp rsp; | |
4030 | ||
4031 | BT_DBG("icid %d, result %d", icid, result); | |
4032 | ||
4033 | rsp.icid = cpu_to_le16(icid); | |
4034 | rsp.result = cpu_to_le16(result); | |
4035 | ||
4036 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4037 | } | |
4038 | ||
4039 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
4040 | struct l2cap_chan *chan, u16 icid, u16 result) | |
4041 | { | |
4042 | struct l2cap_move_chan_cfm cfm; | |
4043 | u8 ident; | |
4044 | ||
4045 | BT_DBG("icid %d, result %d", icid, result); | |
4046 | ||
4047 | ident = l2cap_get_ident(conn); | |
4048 | if (chan) | |
4049 | chan->ident = ident; | |
4050 | ||
4051 | cfm.icid = cpu_to_le16(icid); | |
4052 | cfm.result = cpu_to_le16(result); | |
4053 | ||
4054 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4055 | } | |
4056 | ||
4057 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
4058 | u16 icid) | |
4059 | { | |
4060 | struct l2cap_move_chan_cfm_rsp rsp; | |
4061 | ||
4062 | BT_DBG("icid %d", icid); | |
4063 | ||
4064 | rsp.icid = cpu_to_le16(icid); | |
4065 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4066 | } | |
4067 | ||
4068 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
4069 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4070 | { | |
4071 | struct l2cap_move_chan_req *req = data; | |
4072 | u16 icid = 0; | |
4073 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4074 | ||
4075 | if (cmd_len != sizeof(*req)) | |
4076 | return -EPROTO; | |
4077 | ||
4078 | icid = le16_to_cpu(req->icid); | |
4079 | ||
4080 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
4081 | ||
4082 | if (!enable_hs) | |
4083 | return -EINVAL; | |
4084 | ||
4085 | /* Placeholder: Always refuse */ | |
4086 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4087 | ||
4088 | return 0; | |
4089 | } | |
4090 | ||
4091 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
4092 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4093 | { | |
4094 | struct l2cap_move_chan_rsp *rsp = data; | |
4095 | u16 icid, result; | |
4096 | ||
4097 | if (cmd_len != sizeof(*rsp)) | |
4098 | return -EPROTO; | |
4099 | ||
4100 | icid = le16_to_cpu(rsp->icid); | |
4101 | result = le16_to_cpu(rsp->result); | |
4102 | ||
4103 | BT_DBG("icid %d, result %d", icid, result); | |
4104 | ||
4105 | /* Placeholder: Always unconfirmed */ | |
4106 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4107 | ||
4108 | return 0; | |
4109 | } | |
4110 | ||
4111 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
4112 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4113 | { | |
4114 | struct l2cap_move_chan_cfm *cfm = data; | |
4115 | u16 icid, result; | |
4116 | ||
4117 | if (cmd_len != sizeof(*cfm)) | |
4118 | return -EPROTO; | |
4119 | ||
4120 | icid = le16_to_cpu(cfm->icid); | |
4121 | result = le16_to_cpu(cfm->result); | |
4122 | ||
4123 | BT_DBG("icid %d, result %d", icid, result); | |
4124 | ||
4125 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4126 | ||
4127 | return 0; | |
4128 | } | |
4129 | ||
4130 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
4131 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4132 | { | |
4133 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4134 | u16 icid; | |
4135 | ||
4136 | if (cmd_len != sizeof(*rsp)) | |
4137 | return -EPROTO; | |
4138 | ||
4139 | icid = le16_to_cpu(rsp->icid); | |
4140 | ||
4141 | BT_DBG("icid %d", icid); | |
4142 | ||
4143 | return 0; | |
4144 | } | |
4145 | ||
e2174ca4 | 4146 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4147 | u16 to_multiplier) |
4148 | { | |
4149 | u16 max_latency; | |
4150 | ||
4151 | if (min > max || min < 6 || max > 3200) | |
4152 | return -EINVAL; | |
4153 | ||
4154 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4155 | return -EINVAL; | |
4156 | ||
4157 | if (max >= to_multiplier * 8) | |
4158 | return -EINVAL; | |
4159 | ||
4160 | max_latency = (to_multiplier * 8 / max) - 1; | |
4161 | if (latency > 499 || latency > max_latency) | |
4162 | return -EINVAL; | |
4163 | ||
4164 | return 0; | |
4165 | } | |
4166 | ||
4167 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4168 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4169 | { | |
4170 | struct hci_conn *hcon = conn->hcon; | |
4171 | struct l2cap_conn_param_update_req *req; | |
4172 | struct l2cap_conn_param_update_rsp rsp; | |
4173 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4174 | int err; |
de73115a CT |
4175 | |
4176 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4177 | return -EINVAL; | |
4178 | ||
4179 | cmd_len = __le16_to_cpu(cmd->len); | |
4180 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4181 | return -EPROTO; | |
4182 | ||
4183 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4184 | min = __le16_to_cpu(req->min); |
4185 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4186 | latency = __le16_to_cpu(req->latency); |
4187 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4188 | ||
4189 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4190 | min, max, latency, to_multiplier); | |
4191 | ||
4192 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4193 | |
4194 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4195 | if (err) | |
ac73498c | 4196 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4197 | else |
ac73498c | 4198 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4199 | |
4200 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4201 | sizeof(rsp), &rsp); | |
4202 | ||
2ce603eb CT |
4203 | if (!err) |
4204 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4205 | ||
de73115a CT |
4206 | return 0; |
4207 | } | |
4208 | ||
3300d9a9 CT |
4209 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4210 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4211 | { | |
4212 | int err = 0; | |
4213 | ||
4214 | switch (cmd->code) { | |
4215 | case L2CAP_COMMAND_REJ: | |
4216 | l2cap_command_rej(conn, cmd, data); | |
4217 | break; | |
4218 | ||
4219 | case L2CAP_CONN_REQ: | |
4220 | err = l2cap_connect_req(conn, cmd, data); | |
4221 | break; | |
4222 | ||
4223 | case L2CAP_CONN_RSP: | |
4224 | err = l2cap_connect_rsp(conn, cmd, data); | |
4225 | break; | |
4226 | ||
4227 | case L2CAP_CONF_REQ: | |
4228 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4229 | break; | |
4230 | ||
4231 | case L2CAP_CONF_RSP: | |
4232 | err = l2cap_config_rsp(conn, cmd, data); | |
4233 | break; | |
4234 | ||
4235 | case L2CAP_DISCONN_REQ: | |
4236 | err = l2cap_disconnect_req(conn, cmd, data); | |
4237 | break; | |
4238 | ||
4239 | case L2CAP_DISCONN_RSP: | |
4240 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4241 | break; | |
4242 | ||
4243 | case L2CAP_ECHO_REQ: | |
4244 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4245 | break; | |
4246 | ||
4247 | case L2CAP_ECHO_RSP: | |
4248 | break; | |
4249 | ||
4250 | case L2CAP_INFO_REQ: | |
4251 | err = l2cap_information_req(conn, cmd, data); | |
4252 | break; | |
4253 | ||
4254 | case L2CAP_INFO_RSP: | |
4255 | err = l2cap_information_rsp(conn, cmd, data); | |
4256 | break; | |
4257 | ||
f94ff6ff MM |
4258 | case L2CAP_CREATE_CHAN_REQ: |
4259 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4260 | break; | |
4261 | ||
4262 | case L2CAP_CREATE_CHAN_RSP: | |
4263 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4264 | break; | |
4265 | ||
8d5a04a1 MM |
4266 | case L2CAP_MOVE_CHAN_REQ: |
4267 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4268 | break; | |
4269 | ||
4270 | case L2CAP_MOVE_CHAN_RSP: | |
4271 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4272 | break; | |
4273 | ||
4274 | case L2CAP_MOVE_CHAN_CFM: | |
4275 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4276 | break; | |
4277 | ||
4278 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4279 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4280 | break; | |
4281 | ||
3300d9a9 CT |
4282 | default: |
4283 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4284 | err = -EINVAL; | |
4285 | break; | |
4286 | } | |
4287 | ||
4288 | return err; | |
4289 | } | |
4290 | ||
4291 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4292 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4293 | { | |
4294 | switch (cmd->code) { | |
4295 | case L2CAP_COMMAND_REJ: | |
4296 | return 0; | |
4297 | ||
4298 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4299 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4300 | |
4301 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4302 | return 0; | |
4303 | ||
4304 | default: | |
4305 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4306 | return -EINVAL; | |
4307 | } | |
4308 | } | |
4309 | ||
4310 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4311 | struct sk_buff *skb) | |
1da177e4 LT |
4312 | { |
4313 | u8 *data = skb->data; | |
4314 | int len = skb->len; | |
4315 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4316 | int err; |
1da177e4 LT |
4317 | |
4318 | l2cap_raw_recv(conn, skb); | |
4319 | ||
4320 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4321 | u16 cmd_len; |
1da177e4 LT |
4322 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4323 | data += L2CAP_CMD_HDR_SIZE; | |
4324 | len -= L2CAP_CMD_HDR_SIZE; | |
4325 | ||
88219a0f | 4326 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4327 | |
88219a0f | 4328 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4329 | |
88219a0f | 4330 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4331 | BT_DBG("corrupted command"); |
4332 | break; | |
4333 | } | |
4334 | ||
3300d9a9 CT |
4335 | if (conn->hcon->type == LE_LINK) |
4336 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4337 | else | |
4338 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4339 | |
4340 | if (err) { | |
e2fd318e | 4341 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4342 | |
4343 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4344 | |
4345 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4346 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4347 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4348 | } | |
4349 | ||
88219a0f AV |
4350 | data += cmd_len; |
4351 | len -= cmd_len; | |
1da177e4 LT |
4352 | } |
4353 | ||
4354 | kfree_skb(skb); | |
4355 | } | |
4356 | ||
47d1ec61 | 4357 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4358 | { |
4359 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4360 | int hdr_size; |
4361 | ||
4362 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4363 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4364 | else | |
4365 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4366 | |
47d1ec61 | 4367 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4368 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4369 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4370 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4371 | ||
4372 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4373 | return -EBADMSG; |
fcc203c3 GP |
4374 | } |
4375 | return 0; | |
4376 | } | |
4377 | ||
6ea00485 | 4378 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4379 | { |
e31f7633 | 4380 | struct l2cap_ctrl control; |
d5392c8f | 4381 | |
e31f7633 | 4382 | BT_DBG("chan %p", chan); |
d5392c8f | 4383 | |
e31f7633 MM |
4384 | memset(&control, 0, sizeof(control)); |
4385 | control.sframe = 1; | |
4386 | control.final = 1; | |
4387 | control.reqseq = chan->buffer_seq; | |
4388 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4389 | |
e2ab4353 | 4390 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4391 | control.super = L2CAP_SUPER_RNR; |
4392 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4393 | } |
4394 | ||
e31f7633 MM |
4395 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4396 | chan->unacked_frames > 0) | |
4397 | __set_retrans_timer(chan); | |
d5392c8f | 4398 | |
e31f7633 | 4399 | /* Send pending iframes */ |
525cd185 | 4400 | l2cap_ertm_send(chan); |
d5392c8f | 4401 | |
e2ab4353 | 4402 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4403 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4404 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4405 | * send it now. | |
4406 | */ | |
4407 | control.super = L2CAP_SUPER_RR; | |
4408 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4409 | } |
4410 | } | |
4411 | ||
84084a31 MM |
4412 | static void append_skb_frag(struct sk_buff *skb, |
4413 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4414 | { |
84084a31 MM |
4415 | /* skb->len reflects data in skb as well as all fragments |
4416 | * skb->data_len reflects only data in fragments | |
4417 | */ | |
4418 | if (!skb_has_frag_list(skb)) | |
4419 | skb_shinfo(skb)->frag_list = new_frag; | |
4420 | ||
4421 | new_frag->next = NULL; | |
4422 | ||
4423 | (*last_frag)->next = new_frag; | |
4424 | *last_frag = new_frag; | |
4425 | ||
4426 | skb->len += new_frag->len; | |
4427 | skb->data_len += new_frag->len; | |
4428 | skb->truesize += new_frag->truesize; | |
4429 | } | |
4430 | ||
4b51dae9 MM |
4431 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4432 | struct l2cap_ctrl *control) | |
84084a31 MM |
4433 | { |
4434 | int err = -EINVAL; | |
18778a63 | 4435 | |
4b51dae9 | 4436 | switch (control->sar) { |
7e0ef6ee | 4437 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4438 | if (chan->sdu) |
4439 | break; | |
18778a63 | 4440 | |
84084a31 MM |
4441 | err = chan->ops->recv(chan->data, skb); |
4442 | break; | |
18778a63 | 4443 | |
7e0ef6ee | 4444 | case L2CAP_SAR_START: |
84084a31 MM |
4445 | if (chan->sdu) |
4446 | break; | |
18778a63 | 4447 | |
6f61fd47 | 4448 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4449 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4450 | |
84084a31 MM |
4451 | if (chan->sdu_len > chan->imtu) { |
4452 | err = -EMSGSIZE; | |
4453 | break; | |
4454 | } | |
1890d36b | 4455 | |
84084a31 MM |
4456 | if (skb->len >= chan->sdu_len) |
4457 | break; | |
18778a63 | 4458 | |
84084a31 MM |
4459 | chan->sdu = skb; |
4460 | chan->sdu_last_frag = skb; | |
18778a63 | 4461 | |
84084a31 MM |
4462 | skb = NULL; |
4463 | err = 0; | |
18778a63 GP |
4464 | break; |
4465 | ||
7e0ef6ee | 4466 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4467 | if (!chan->sdu) |
84084a31 | 4468 | break; |
18778a63 | 4469 | |
84084a31 MM |
4470 | append_skb_frag(chan->sdu, skb, |
4471 | &chan->sdu_last_frag); | |
4472 | skb = NULL; | |
18778a63 | 4473 | |
84084a31 MM |
4474 | if (chan->sdu->len >= chan->sdu_len) |
4475 | break; | |
4178ba46 | 4476 | |
84084a31 | 4477 | err = 0; |
18778a63 GP |
4478 | break; |
4479 | ||
7e0ef6ee | 4480 | case L2CAP_SAR_END: |
6f61fd47 | 4481 | if (!chan->sdu) |
84084a31 | 4482 | break; |
18778a63 | 4483 | |
84084a31 MM |
4484 | append_skb_frag(chan->sdu, skb, |
4485 | &chan->sdu_last_frag); | |
4486 | skb = NULL; | |
4178ba46 | 4487 | |
84084a31 MM |
4488 | if (chan->sdu->len != chan->sdu_len) |
4489 | break; | |
18778a63 | 4490 | |
84084a31 | 4491 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4492 | |
84084a31 MM |
4493 | if (!err) { |
4494 | /* Reassembly complete */ | |
4495 | chan->sdu = NULL; | |
4496 | chan->sdu_last_frag = NULL; | |
4497 | chan->sdu_len = 0; | |
1890d36b | 4498 | } |
18778a63 GP |
4499 | break; |
4500 | } | |
4501 | ||
84084a31 MM |
4502 | if (err) { |
4503 | kfree_skb(skb); | |
4504 | kfree_skb(chan->sdu); | |
4505 | chan->sdu = NULL; | |
4506 | chan->sdu_last_frag = NULL; | |
4507 | chan->sdu_len = 0; | |
4508 | } | |
18778a63 | 4509 | |
84084a31 | 4510 | return err; |
18778a63 GP |
4511 | } |
4512 | ||
61aa4f5b | 4513 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4514 | { |
61aa4f5b | 4515 | u8 event; |
712132eb | 4516 | |
61aa4f5b MM |
4517 | if (chan->mode != L2CAP_MODE_ERTM) |
4518 | return; | |
712132eb | 4519 | |
61aa4f5b | 4520 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4521 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4522 | } |
4523 | ||
d2a7ac5d MM |
4524 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4525 | { | |
63838725 MM |
4526 | int err = 0; |
4527 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4528 | * until a gap is encountered. | |
4529 | */ | |
4530 | ||
4531 | BT_DBG("chan %p", chan); | |
4532 | ||
4533 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4534 | struct sk_buff *skb; | |
4535 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4536 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4537 | ||
4538 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4539 | ||
4540 | if (!skb) | |
4541 | break; | |
4542 | ||
4543 | skb_unlink(skb, &chan->srej_q); | |
4544 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4545 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4546 | if (err) | |
4547 | break; | |
4548 | } | |
4549 | ||
4550 | if (skb_queue_empty(&chan->srej_q)) { | |
4551 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4552 | l2cap_send_ack(chan); | |
4553 | } | |
4554 | ||
4555 | return err; | |
d2a7ac5d MM |
4556 | } |
4557 | ||
4558 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4559 | struct l2cap_ctrl *control) | |
4560 | { | |
f80842a8 MM |
4561 | struct sk_buff *skb; |
4562 | ||
4563 | BT_DBG("chan %p, control %p", chan, control); | |
4564 | ||
4565 | if (control->reqseq == chan->next_tx_seq) { | |
4566 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4567 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4568 | return; | |
4569 | } | |
4570 | ||
4571 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4572 | ||
4573 | if (skb == NULL) { | |
4574 | BT_DBG("Seq %d not available for retransmission", | |
4575 | control->reqseq); | |
4576 | return; | |
4577 | } | |
4578 | ||
4579 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4580 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4581 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4582 | return; | |
4583 | } | |
4584 | ||
4585 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4586 | ||
4587 | if (control->poll) { | |
4588 | l2cap_pass_to_tx(chan, control); | |
4589 | ||
4590 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4591 | l2cap_retransmit(chan, control); | |
4592 | l2cap_ertm_send(chan); | |
4593 | ||
4594 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4595 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4596 | chan->srej_save_reqseq = control->reqseq; | |
4597 | } | |
4598 | } else { | |
4599 | l2cap_pass_to_tx_fbit(chan, control); | |
4600 | ||
4601 | if (control->final) { | |
4602 | if (chan->srej_save_reqseq != control->reqseq || | |
4603 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4604 | &chan->conn_state)) | |
4605 | l2cap_retransmit(chan, control); | |
4606 | } else { | |
4607 | l2cap_retransmit(chan, control); | |
4608 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4609 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4610 | chan->srej_save_reqseq = control->reqseq; | |
4611 | } | |
4612 | } | |
4613 | } | |
d2a7ac5d MM |
4614 | } |
4615 | ||
4616 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4617 | struct l2cap_ctrl *control) | |
4618 | { | |
fcd289df MM |
4619 | struct sk_buff *skb; |
4620 | ||
4621 | BT_DBG("chan %p, control %p", chan, control); | |
4622 | ||
4623 | if (control->reqseq == chan->next_tx_seq) { | |
4624 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4625 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4626 | return; | |
4627 | } | |
4628 | ||
4629 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4630 | ||
4631 | if (chan->max_tx && skb && | |
4632 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4633 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4634 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4635 | return; | |
4636 | } | |
4637 | ||
4638 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4639 | ||
4640 | l2cap_pass_to_tx(chan, control); | |
4641 | ||
4642 | if (control->final) { | |
4643 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4644 | l2cap_retransmit_all(chan, control); | |
4645 | } else { | |
4646 | l2cap_retransmit_all(chan, control); | |
4647 | l2cap_ertm_send(chan); | |
4648 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4649 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4650 | } | |
d2a7ac5d MM |
4651 | } |
4652 | ||
4b51dae9 MM |
4653 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4654 | { | |
4655 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4656 | ||
4657 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4658 | chan->expected_tx_seq); | |
4659 | ||
4660 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4661 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4662 | chan->tx_win) { | |
4663 | /* See notes below regarding "double poll" and | |
4664 | * invalid packets. | |
4665 | */ | |
4666 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4667 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4668 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4669 | } else { | |
4670 | BT_DBG("Invalid - in window after SREJ sent"); | |
4671 | return L2CAP_TXSEQ_INVALID; | |
4672 | } | |
4673 | } | |
4674 | ||
4675 | if (chan->srej_list.head == txseq) { | |
4676 | BT_DBG("Expected SREJ"); | |
4677 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4678 | } | |
4679 | ||
4680 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4681 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4682 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4683 | } | |
4684 | ||
4685 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4686 | BT_DBG("Unexpected SREJ - not requested"); | |
4687 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4688 | } | |
4689 | } | |
4690 | ||
4691 | if (chan->expected_tx_seq == txseq) { | |
4692 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4693 | chan->tx_win) { | |
4694 | BT_DBG("Invalid - txseq outside tx window"); | |
4695 | return L2CAP_TXSEQ_INVALID; | |
4696 | } else { | |
4697 | BT_DBG("Expected"); | |
4698 | return L2CAP_TXSEQ_EXPECTED; | |
4699 | } | |
4700 | } | |
4701 | ||
4702 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4703 | __seq_offset(chan, chan->expected_tx_seq, | |
4704 | chan->last_acked_seq)){ | |
4705 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4706 | return L2CAP_TXSEQ_DUPLICATE; | |
4707 | } | |
4708 | ||
4709 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4710 | /* A source of invalid packets is a "double poll" condition, | |
4711 | * where delays cause us to send multiple poll packets. If | |
4712 | * the remote stack receives and processes both polls, | |
4713 | * sequence numbers can wrap around in such a way that a | |
4714 | * resent frame has a sequence number that looks like new data | |
4715 | * with a sequence gap. This would trigger an erroneous SREJ | |
4716 | * request. | |
4717 | * | |
4718 | * Fortunately, this is impossible with a tx window that's | |
4719 | * less than half of the maximum sequence number, which allows | |
4720 | * invalid frames to be safely ignored. | |
4721 | * | |
4722 | * With tx window sizes greater than half of the tx window | |
4723 | * maximum, the frame is invalid and cannot be ignored. This | |
4724 | * causes a disconnect. | |
4725 | */ | |
4726 | ||
4727 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4728 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4729 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4730 | } else { | |
4731 | BT_DBG("Invalid - txseq outside tx window"); | |
4732 | return L2CAP_TXSEQ_INVALID; | |
4733 | } | |
4734 | } else { | |
4735 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4736 | return L2CAP_TXSEQ_UNEXPECTED; | |
4737 | } | |
4738 | } | |
4739 | ||
d2a7ac5d MM |
4740 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4741 | struct l2cap_ctrl *control, | |
4742 | struct sk_buff *skb, u8 event) | |
4743 | { | |
4744 | int err = 0; | |
4745 | bool skb_in_use = 0; | |
4746 | ||
4747 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4748 | event); | |
4749 | ||
4750 | switch (event) { | |
4751 | case L2CAP_EV_RECV_IFRAME: | |
4752 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4753 | case L2CAP_TXSEQ_EXPECTED: | |
4754 | l2cap_pass_to_tx(chan, control); | |
4755 | ||
4756 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4757 | BT_DBG("Busy, discarding expected seq %d", | |
4758 | control->txseq); | |
4759 | break; | |
4760 | } | |
4761 | ||
4762 | chan->expected_tx_seq = __next_seq(chan, | |
4763 | control->txseq); | |
4764 | ||
4765 | chan->buffer_seq = chan->expected_tx_seq; | |
4766 | skb_in_use = 1; | |
4767 | ||
4768 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4769 | if (err) | |
4770 | break; | |
4771 | ||
4772 | if (control->final) { | |
4773 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4774 | &chan->conn_state)) { | |
4775 | control->final = 0; | |
4776 | l2cap_retransmit_all(chan, control); | |
4777 | l2cap_ertm_send(chan); | |
4778 | } | |
4779 | } | |
4780 | ||
4781 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4782 | l2cap_send_ack(chan); | |
4783 | break; | |
4784 | case L2CAP_TXSEQ_UNEXPECTED: | |
4785 | l2cap_pass_to_tx(chan, control); | |
4786 | ||
4787 | /* Can't issue SREJ frames in the local busy state. | |
4788 | * Drop this frame, it will be seen as missing | |
4789 | * when local busy is exited. | |
4790 | */ | |
4791 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4792 | BT_DBG("Busy, discarding unexpected seq %d", | |
4793 | control->txseq); | |
4794 | break; | |
4795 | } | |
4796 | ||
4797 | /* There was a gap in the sequence, so an SREJ | |
4798 | * must be sent for each missing frame. The | |
4799 | * current frame is stored for later use. | |
4800 | */ | |
4801 | skb_queue_tail(&chan->srej_q, skb); | |
4802 | skb_in_use = 1; | |
4803 | BT_DBG("Queued %p (queue len %d)", skb, | |
4804 | skb_queue_len(&chan->srej_q)); | |
4805 | ||
4806 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4807 | l2cap_seq_list_clear(&chan->srej_list); | |
4808 | l2cap_send_srej(chan, control->txseq); | |
4809 | ||
4810 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4811 | break; | |
4812 | case L2CAP_TXSEQ_DUPLICATE: | |
4813 | l2cap_pass_to_tx(chan, control); | |
4814 | break; | |
4815 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4816 | break; | |
4817 | case L2CAP_TXSEQ_INVALID: | |
4818 | default: | |
4819 | l2cap_send_disconn_req(chan->conn, chan, | |
4820 | ECONNRESET); | |
4821 | break; | |
4822 | } | |
4823 | break; | |
4824 | case L2CAP_EV_RECV_RR: | |
4825 | l2cap_pass_to_tx(chan, control); | |
4826 | if (control->final) { | |
4827 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4828 | ||
4829 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4830 | &chan->conn_state)) { | |
4831 | control->final = 0; | |
4832 | l2cap_retransmit_all(chan, control); | |
4833 | } | |
4834 | ||
4835 | l2cap_ertm_send(chan); | |
4836 | } else if (control->poll) { | |
4837 | l2cap_send_i_or_rr_or_rnr(chan); | |
4838 | } else { | |
4839 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4840 | &chan->conn_state) && | |
4841 | chan->unacked_frames) | |
4842 | __set_retrans_timer(chan); | |
4843 | ||
4844 | l2cap_ertm_send(chan); | |
4845 | } | |
4846 | break; | |
4847 | case L2CAP_EV_RECV_RNR: | |
4848 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4849 | l2cap_pass_to_tx(chan, control); | |
4850 | if (control && control->poll) { | |
4851 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4852 | l2cap_send_rr_or_rnr(chan, 0); | |
4853 | } | |
4854 | __clear_retrans_timer(chan); | |
4855 | l2cap_seq_list_clear(&chan->retrans_list); | |
4856 | break; | |
4857 | case L2CAP_EV_RECV_REJ: | |
4858 | l2cap_handle_rej(chan, control); | |
4859 | break; | |
4860 | case L2CAP_EV_RECV_SREJ: | |
4861 | l2cap_handle_srej(chan, control); | |
4862 | break; | |
4863 | default: | |
4864 | break; | |
4865 | } | |
4866 | ||
4867 | if (skb && !skb_in_use) { | |
4868 | BT_DBG("Freeing %p", skb); | |
4869 | kfree_skb(skb); | |
4870 | } | |
4871 | ||
4872 | return err; | |
4873 | } | |
4874 | ||
4875 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4876 | struct l2cap_ctrl *control, | |
4877 | struct sk_buff *skb, u8 event) | |
4878 | { | |
4879 | int err = 0; | |
4880 | u16 txseq = control->txseq; | |
4881 | bool skb_in_use = 0; | |
4882 | ||
4883 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4884 | event); | |
4885 | ||
4886 | switch (event) { | |
4887 | case L2CAP_EV_RECV_IFRAME: | |
4888 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4889 | case L2CAP_TXSEQ_EXPECTED: | |
4890 | /* Keep frame for reassembly later */ | |
4891 | l2cap_pass_to_tx(chan, control); | |
4892 | skb_queue_tail(&chan->srej_q, skb); | |
4893 | skb_in_use = 1; | |
4894 | BT_DBG("Queued %p (queue len %d)", skb, | |
4895 | skb_queue_len(&chan->srej_q)); | |
4896 | ||
4897 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4898 | break; | |
4899 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4900 | l2cap_seq_list_pop(&chan->srej_list); | |
4901 | ||
4902 | l2cap_pass_to_tx(chan, control); | |
4903 | skb_queue_tail(&chan->srej_q, skb); | |
4904 | skb_in_use = 1; | |
4905 | BT_DBG("Queued %p (queue len %d)", skb, | |
4906 | skb_queue_len(&chan->srej_q)); | |
4907 | ||
4908 | err = l2cap_rx_queued_iframes(chan); | |
4909 | if (err) | |
4910 | break; | |
4911 | ||
4912 | break; | |
4913 | case L2CAP_TXSEQ_UNEXPECTED: | |
4914 | /* Got a frame that can't be reassembled yet. | |
4915 | * Save it for later, and send SREJs to cover | |
4916 | * the missing frames. | |
4917 | */ | |
4918 | skb_queue_tail(&chan->srej_q, skb); | |
4919 | skb_in_use = 1; | |
4920 | BT_DBG("Queued %p (queue len %d)", skb, | |
4921 | skb_queue_len(&chan->srej_q)); | |
4922 | ||
4923 | l2cap_pass_to_tx(chan, control); | |
4924 | l2cap_send_srej(chan, control->txseq); | |
4925 | break; | |
4926 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4927 | /* This frame was requested with an SREJ, but | |
4928 | * some expected retransmitted frames are | |
4929 | * missing. Request retransmission of missing | |
4930 | * SREJ'd frames. | |
4931 | */ | |
4932 | skb_queue_tail(&chan->srej_q, skb); | |
4933 | skb_in_use = 1; | |
4934 | BT_DBG("Queued %p (queue len %d)", skb, | |
4935 | skb_queue_len(&chan->srej_q)); | |
4936 | ||
4937 | l2cap_pass_to_tx(chan, control); | |
4938 | l2cap_send_srej_list(chan, control->txseq); | |
4939 | break; | |
4940 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4941 | /* We've already queued this frame. Drop this copy. */ | |
4942 | l2cap_pass_to_tx(chan, control); | |
4943 | break; | |
4944 | case L2CAP_TXSEQ_DUPLICATE: | |
4945 | /* Expecting a later sequence number, so this frame | |
4946 | * was already received. Ignore it completely. | |
4947 | */ | |
4948 | break; | |
4949 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4950 | break; | |
4951 | case L2CAP_TXSEQ_INVALID: | |
4952 | default: | |
4953 | l2cap_send_disconn_req(chan->conn, chan, | |
4954 | ECONNRESET); | |
4955 | break; | |
4956 | } | |
4957 | break; | |
4958 | case L2CAP_EV_RECV_RR: | |
4959 | l2cap_pass_to_tx(chan, control); | |
4960 | if (control->final) { | |
4961 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4962 | ||
4963 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4964 | &chan->conn_state)) { | |
4965 | control->final = 0; | |
4966 | l2cap_retransmit_all(chan, control); | |
4967 | } | |
4968 | ||
4969 | l2cap_ertm_send(chan); | |
4970 | } else if (control->poll) { | |
4971 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4972 | &chan->conn_state) && | |
4973 | chan->unacked_frames) { | |
4974 | __set_retrans_timer(chan); | |
4975 | } | |
4976 | ||
4977 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4978 | l2cap_send_srej_tail(chan); | |
4979 | } else { | |
4980 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4981 | &chan->conn_state) && | |
4982 | chan->unacked_frames) | |
4983 | __set_retrans_timer(chan); | |
4984 | ||
4985 | l2cap_send_ack(chan); | |
4986 | } | |
4987 | break; | |
4988 | case L2CAP_EV_RECV_RNR: | |
4989 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4990 | l2cap_pass_to_tx(chan, control); | |
4991 | if (control->poll) { | |
4992 | l2cap_send_srej_tail(chan); | |
4993 | } else { | |
4994 | struct l2cap_ctrl rr_control; | |
4995 | memset(&rr_control, 0, sizeof(rr_control)); | |
4996 | rr_control.sframe = 1; | |
4997 | rr_control.super = L2CAP_SUPER_RR; | |
4998 | rr_control.reqseq = chan->buffer_seq; | |
4999 | l2cap_send_sframe(chan, &rr_control); | |
5000 | } | |
5001 | ||
5002 | break; | |
5003 | case L2CAP_EV_RECV_REJ: | |
5004 | l2cap_handle_rej(chan, control); | |
5005 | break; | |
5006 | case L2CAP_EV_RECV_SREJ: | |
5007 | l2cap_handle_srej(chan, control); | |
5008 | break; | |
5009 | } | |
5010 | ||
5011 | if (skb && !skb_in_use) { | |
5012 | BT_DBG("Freeing %p", skb); | |
5013 | kfree_skb(skb); | |
5014 | } | |
5015 | ||
5016 | return err; | |
5017 | } | |
5018 | ||
5019 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5020 | { | |
5021 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5022 | u16 unacked; | |
5023 | ||
5024 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5025 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5026 | } | |
5027 | ||
cec8ab6e MM |
5028 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5029 | struct sk_buff *skb, u8 event) | |
218bb9df | 5030 | { |
d2a7ac5d MM |
5031 | int err = 0; |
5032 | ||
5033 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5034 | control, skb, event, chan->rx_state); | |
5035 | ||
5036 | if (__valid_reqseq(chan, control->reqseq)) { | |
5037 | switch (chan->rx_state) { | |
5038 | case L2CAP_RX_STATE_RECV: | |
5039 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5040 | break; | |
5041 | case L2CAP_RX_STATE_SREJ_SENT: | |
5042 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5043 | event); | |
5044 | break; | |
5045 | default: | |
5046 | /* shut it down */ | |
5047 | break; | |
5048 | } | |
5049 | } else { | |
5050 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5051 | control->reqseq, chan->next_tx_seq, | |
5052 | chan->expected_ack_seq); | |
5053 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5054 | } | |
5055 | ||
5056 | return err; | |
cec8ab6e MM |
5057 | } |
5058 | ||
5059 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5060 | struct sk_buff *skb) | |
5061 | { | |
4b51dae9 MM |
5062 | int err = 0; |
5063 | ||
5064 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5065 | chan->rx_state); | |
5066 | ||
5067 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5068 | L2CAP_TXSEQ_EXPECTED) { | |
5069 | l2cap_pass_to_tx(chan, control); | |
5070 | ||
5071 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5072 | __next_seq(chan, chan->buffer_seq)); | |
5073 | ||
5074 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5075 | ||
5076 | l2cap_reassemble_sdu(chan, skb, control); | |
5077 | } else { | |
5078 | if (chan->sdu) { | |
5079 | kfree_skb(chan->sdu); | |
5080 | chan->sdu = NULL; | |
5081 | } | |
5082 | chan->sdu_last_frag = NULL; | |
5083 | chan->sdu_len = 0; | |
5084 | ||
5085 | if (skb) { | |
5086 | BT_DBG("Freeing %p", skb); | |
5087 | kfree_skb(skb); | |
5088 | } | |
5089 | } | |
5090 | ||
5091 | chan->last_acked_seq = control->txseq; | |
5092 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5093 | ||
5094 | return err; | |
cec8ab6e MM |
5095 | } |
5096 | ||
5097 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5098 | { | |
5099 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5100 | u16 len; | |
5101 | u8 event; | |
218bb9df | 5102 | |
b76bbd66 MM |
5103 | __unpack_control(chan, skb); |
5104 | ||
218bb9df GP |
5105 | len = skb->len; |
5106 | ||
5107 | /* | |
5108 | * We can just drop the corrupted I-frame here. | |
5109 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5110 | * procedures and ask for retransmission. |
218bb9df | 5111 | */ |
47d1ec61 | 5112 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5113 | goto drop; |
5114 | ||
cec8ab6e | 5115 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5116 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5117 | |
47d1ec61 | 5118 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5119 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5120 | |
47d1ec61 | 5121 | if (len > chan->mps) { |
8c1d787b | 5122 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5123 | goto drop; |
5124 | } | |
5125 | ||
cec8ab6e MM |
5126 | if (!control->sframe) { |
5127 | int err; | |
218bb9df | 5128 | |
cec8ab6e MM |
5129 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5130 | control->sar, control->reqseq, control->final, | |
5131 | control->txseq); | |
218bb9df | 5132 | |
cec8ab6e MM |
5133 | /* Validate F-bit - F=0 always valid, F=1 only |
5134 | * valid in TX WAIT_F | |
5135 | */ | |
5136 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5137 | goto drop; |
cec8ab6e MM |
5138 | |
5139 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5140 | event = L2CAP_EV_RECV_IFRAME; | |
5141 | err = l2cap_rx(chan, control, skb, event); | |
5142 | } else { | |
5143 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5144 | } |
5145 | ||
cec8ab6e MM |
5146 | if (err) |
5147 | l2cap_send_disconn_req(chan->conn, chan, | |
5148 | ECONNRESET); | |
218bb9df | 5149 | } else { |
cec8ab6e MM |
5150 | const u8 rx_func_to_event[4] = { |
5151 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5152 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5153 | }; | |
5154 | ||
5155 | /* Only I-frames are expected in streaming mode */ | |
5156 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5157 | goto drop; | |
5158 | ||
5159 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5160 | control->reqseq, control->final, control->poll, | |
5161 | control->super); | |
5162 | ||
218bb9df GP |
5163 | if (len != 0) { |
5164 | BT_ERR("%d", len); | |
8c1d787b | 5165 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5166 | goto drop; |
5167 | } | |
5168 | ||
cec8ab6e MM |
5169 | /* Validate F and P bits */ |
5170 | if (control->final && (control->poll || | |
5171 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5172 | goto drop; | |
5173 | ||
5174 | event = rx_func_to_event[control->super]; | |
5175 | if (l2cap_rx(chan, control, skb, event)) | |
5176 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5177 | } |
5178 | ||
5179 | return 0; | |
5180 | ||
5181 | drop: | |
5182 | kfree_skb(skb); | |
5183 | return 0; | |
5184 | } | |
5185 | ||
1da177e4 LT |
5186 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
5187 | { | |
48454079 | 5188 | struct l2cap_chan *chan; |
1da177e4 | 5189 | |
baa7e1fa | 5190 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5191 | if (!chan) { |
1da177e4 | 5192 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 5193 | /* Drop packet and return */ |
3379013b | 5194 | kfree_skb(skb); |
6be36555 | 5195 | return 0; |
1da177e4 LT |
5196 | } |
5197 | ||
49208c9c | 5198 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5199 | |
89bc500e | 5200 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5201 | goto drop; |
5202 | ||
0c1bc5c6 | 5203 | switch (chan->mode) { |
1c2acffb GP |
5204 | case L2CAP_MODE_BASIC: |
5205 | /* If socket recv buffers overflows we drop data here | |
5206 | * which is *bad* because L2CAP has to be reliable. | |
5207 | * But we don't have any other choice. L2CAP doesn't | |
5208 | * provide flow control mechanism. */ | |
1da177e4 | 5209 | |
0c1bc5c6 | 5210 | if (chan->imtu < skb->len) |
1c2acffb | 5211 | goto drop; |
1da177e4 | 5212 | |
23070494 | 5213 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
5214 | goto done; |
5215 | break; | |
5216 | ||
5217 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5218 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5219 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5220 | goto done; |
5221 | ||
1c2acffb | 5222 | default: |
0c1bc5c6 | 5223 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5224 | break; |
5225 | } | |
1da177e4 LT |
5226 | |
5227 | drop: | |
5228 | kfree_skb(skb); | |
5229 | ||
5230 | done: | |
6be36555 | 5231 | l2cap_chan_unlock(chan); |
0139418c | 5232 | |
1da177e4 LT |
5233 | return 0; |
5234 | } | |
5235 | ||
8e036fc3 | 5236 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 5237 | { |
23691d75 | 5238 | struct l2cap_chan *chan; |
1da177e4 | 5239 | |
c2287681 | 5240 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5241 | if (!chan) |
1da177e4 LT |
5242 | goto drop; |
5243 | ||
5b4cedaa | 5244 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5245 | |
89bc500e | 5246 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5247 | goto drop; |
5248 | ||
e13e21dc | 5249 | if (chan->imtu < skb->len) |
1da177e4 LT |
5250 | goto drop; |
5251 | ||
23070494 | 5252 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 5253 | return 0; |
1da177e4 LT |
5254 | |
5255 | drop: | |
5256 | kfree_skb(skb); | |
5257 | ||
1da177e4 LT |
5258 | return 0; |
5259 | } | |
5260 | ||
d9b88702 AE |
5261 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5262 | struct sk_buff *skb) | |
9f69bda6 | 5263 | { |
23691d75 | 5264 | struct l2cap_chan *chan; |
9f69bda6 | 5265 | |
c2287681 | 5266 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5267 | if (!chan) |
9f69bda6 GP |
5268 | goto drop; |
5269 | ||
5b4cedaa | 5270 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5271 | |
89bc500e | 5272 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5273 | goto drop; |
5274 | ||
e13e21dc | 5275 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5276 | goto drop; |
5277 | ||
23070494 | 5278 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 5279 | return 0; |
9f69bda6 GP |
5280 | |
5281 | drop: | |
5282 | kfree_skb(skb); | |
5283 | ||
9f69bda6 GP |
5284 | return 0; |
5285 | } | |
5286 | ||
1da177e4 LT |
5287 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5288 | { | |
5289 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5290 | u16 cid, len; |
5291 | __le16 psm; | |
1da177e4 LT |
5292 | |
5293 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5294 | cid = __le16_to_cpu(lh->cid); | |
5295 | len = __le16_to_cpu(lh->len); | |
5296 | ||
1c2acffb GP |
5297 | if (len != skb->len) { |
5298 | kfree_skb(skb); | |
5299 | return; | |
5300 | } | |
5301 | ||
1da177e4 LT |
5302 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5303 | ||
5304 | switch (cid) { | |
3300d9a9 | 5305 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5306 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5307 | l2cap_sig_channel(conn, skb); |
5308 | break; | |
5309 | ||
8db4dc46 | 5310 | case L2CAP_CID_CONN_LESS: |
097db76c | 5311 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
5312 | skb_pull(skb, 2); |
5313 | l2cap_conless_channel(conn, psm, skb); | |
5314 | break; | |
5315 | ||
9f69bda6 GP |
5316 | case L2CAP_CID_LE_DATA: |
5317 | l2cap_att_channel(conn, cid, skb); | |
5318 | break; | |
5319 | ||
b501d6a1 AB |
5320 | case L2CAP_CID_SMP: |
5321 | if (smp_sig_channel(conn, skb)) | |
5322 | l2cap_conn_del(conn->hcon, EACCES); | |
5323 | break; | |
5324 | ||
1da177e4 LT |
5325 | default: |
5326 | l2cap_data_channel(conn, cid, skb); | |
5327 | break; | |
5328 | } | |
5329 | } | |
5330 | ||
5331 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5332 | ||
686ebf28 | 5333 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5334 | { |
5335 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5336 | struct l2cap_chan *c; |
1da177e4 | 5337 | |
1da177e4 LT |
5338 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5339 | ||
5340 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5341 | read_lock(&chan_list_lock); |
5342 | list_for_each_entry(c, &chan_list, global_l) { | |
5343 | struct sock *sk = c->sk; | |
4343478f | 5344 | |
89bc500e | 5345 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5346 | continue; |
5347 | ||
5348 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5349 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5350 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5351 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5352 | exact++; |
2af6b9d5 MH |
5353 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5354 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5355 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5356 | lm2 |= HCI_LM_MASTER; |
5357 | } | |
1da177e4 | 5358 | } |
23691d75 | 5359 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5360 | |
5361 | return exact ? lm1 : lm2; | |
5362 | } | |
5363 | ||
686ebf28 | 5364 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5365 | { |
0139418c MH |
5366 | struct l2cap_conn *conn; |
5367 | ||
1da177e4 LT |
5368 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5369 | ||
1da177e4 | 5370 | if (!status) { |
1da177e4 LT |
5371 | conn = l2cap_conn_add(hcon, status); |
5372 | if (conn) | |
5373 | l2cap_conn_ready(conn); | |
0139418c | 5374 | } else |
e175072f | 5375 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5376 | |
5377 | return 0; | |
5378 | } | |
5379 | ||
686ebf28 | 5380 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5381 | { |
5382 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5383 | ||
5384 | BT_DBG("hcon %p", hcon); | |
5385 | ||
686ebf28 | 5386 | if (!conn) |
9f5a0d7b | 5387 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5388 | return conn->disc_reason; |
5389 | } | |
5390 | ||
686ebf28 | 5391 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5392 | { |
5393 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5394 | ||
e175072f | 5395 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5396 | return 0; |
5397 | } | |
5398 | ||
4343478f | 5399 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5400 | { |
715ec005 | 5401 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5402 | return; |
5403 | ||
f62e4323 | 5404 | if (encrypt == 0x00) { |
4343478f | 5405 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5406 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5407 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5408 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5409 | } else { |
4343478f | 5410 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5411 | __clear_chan_timer(chan); |
f62e4323 MH |
5412 | } |
5413 | } | |
5414 | ||
686ebf28 | 5415 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5416 | { |
0139418c | 5417 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5418 | struct l2cap_chan *chan; |
1da177e4 | 5419 | |
0139418c | 5420 | if (!conn) |
1da177e4 | 5421 | return 0; |
0139418c | 5422 | |
1da177e4 LT |
5423 | BT_DBG("conn %p", conn); |
5424 | ||
160dc6ac | 5425 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5426 | if (!status && encrypt) |
5427 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5428 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5429 | } |
5430 | ||
3df91ea2 | 5431 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5432 | |
3df91ea2 | 5433 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5434 | l2cap_chan_lock(chan); |
1da177e4 | 5435 | |
f1cb9af5 VCG |
5436 | BT_DBG("chan->scid %d", chan->scid); |
5437 | ||
5438 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5439 | if (!status && encrypt) { | |
5440 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5441 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5442 | } |
5443 | ||
6be36555 | 5444 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5445 | continue; |
5446 | } | |
5447 | ||
c1360a1c | 5448 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5449 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5450 | continue; |
5451 | } | |
5452 | ||
89bc500e GP |
5453 | if (!status && (chan->state == BT_CONNECTED || |
5454 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5455 | struct sock *sk = chan->sk; |
5456 | ||
c5daa683 | 5457 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5458 | sk->sk_state_change(sk); |
5459 | ||
4343478f | 5460 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5461 | l2cap_chan_unlock(chan); |
9719f8af MH |
5462 | continue; |
5463 | } | |
5464 | ||
89bc500e | 5465 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5466 | if (!status) { |
9b27f350 | 5467 | l2cap_send_conn_req(chan); |
b1235d79 | 5468 | } else { |
ba13ccd9 | 5469 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5470 | } |
89bc500e | 5471 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5472 | struct sock *sk = chan->sk; |
b1235d79 | 5473 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5474 | __u16 res, stat; |
1da177e4 | 5475 | |
6be36555 AE |
5476 | lock_sock(sk); |
5477 | ||
b1235d79 | 5478 | if (!status) { |
c5daa683 GP |
5479 | if (test_bit(BT_SK_DEFER_SETUP, |
5480 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5481 | struct sock *parent = bt_sk(sk)->parent; |
5482 | res = L2CAP_CR_PEND; | |
5483 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5484 | if (parent) |
5485 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5486 | } else { |
0e587be7 | 5487 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5488 | res = L2CAP_CR_SUCCESS; |
5489 | stat = L2CAP_CS_NO_INFO; | |
5490 | } | |
b1235d79 | 5491 | } else { |
0e587be7 | 5492 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5493 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5494 | res = L2CAP_CR_SEC_BLOCK; |
5495 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5496 | } |
5497 | ||
6be36555 AE |
5498 | release_sock(sk); |
5499 | ||
fe4128e0 GP |
5500 | rsp.scid = cpu_to_le16(chan->dcid); |
5501 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5502 | rsp.result = cpu_to_le16(res); |
5503 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5504 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5505 | sizeof(rsp), &rsp); | |
2d369359 MM |
5506 | |
5507 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5508 | res == L2CAP_CR_SUCCESS) { | |
5509 | char buf[128]; | |
5510 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5511 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5512 | L2CAP_CONF_REQ, | |
5513 | l2cap_build_conf_req(chan, buf), | |
5514 | buf); | |
5515 | chan->num_conf_req++; | |
5516 | } | |
b1235d79 | 5517 | } |
1da177e4 | 5518 | |
6be36555 | 5519 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5520 | } |
5521 | ||
3df91ea2 | 5522 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5523 | |
1da177e4 LT |
5524 | return 0; |
5525 | } | |
5526 | ||
686ebf28 | 5527 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5528 | { |
5529 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5530 | ||
5a08ecce AE |
5531 | if (!conn) |
5532 | conn = l2cap_conn_add(hcon, 0); | |
5533 | ||
5534 | if (!conn) | |
1da177e4 LT |
5535 | goto drop; |
5536 | ||
5537 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5538 | ||
e702112f | 5539 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5540 | struct l2cap_hdr *hdr; |
5541 | int len; | |
5542 | ||
5543 | if (conn->rx_len) { | |
5544 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5545 | kfree_skb(conn->rx_skb); | |
5546 | conn->rx_skb = NULL; | |
5547 | conn->rx_len = 0; | |
5548 | l2cap_conn_unreliable(conn, ECOMM); | |
5549 | } | |
5550 | ||
aae7fe22 AE |
5551 | /* Start fragment always begin with Basic L2CAP header */ |
5552 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5553 | BT_ERR("Frame is too short (len %d)", skb->len); |
5554 | l2cap_conn_unreliable(conn, ECOMM); | |
5555 | goto drop; | |
5556 | } | |
5557 | ||
5558 | hdr = (struct l2cap_hdr *) skb->data; | |
5559 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5560 | ||
5561 | if (len == skb->len) { | |
5562 | /* Complete frame received */ | |
5563 | l2cap_recv_frame(conn, skb); | |
5564 | return 0; | |
5565 | } | |
5566 | ||
5567 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5568 | ||
5569 | if (skb->len > len) { | |
5570 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5571 | skb->len, len); | |
5572 | l2cap_conn_unreliable(conn, ECOMM); | |
5573 | goto drop; | |
5574 | } | |
5575 | ||
5576 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5577 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5578 | if (!conn->rx_skb) | |
1da177e4 LT |
5579 | goto drop; |
5580 | ||
d626f62b | 5581 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5582 | skb->len); |
1da177e4 LT |
5583 | conn->rx_len = len - skb->len; |
5584 | } else { | |
5585 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5586 | ||
5587 | if (!conn->rx_len) { | |
5588 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5589 | l2cap_conn_unreliable(conn, ECOMM); | |
5590 | goto drop; | |
5591 | } | |
5592 | ||
5593 | if (skb->len > conn->rx_len) { | |
5594 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5595 | skb->len, conn->rx_len); | |
5596 | kfree_skb(conn->rx_skb); | |
5597 | conn->rx_skb = NULL; | |
5598 | conn->rx_len = 0; | |
5599 | l2cap_conn_unreliable(conn, ECOMM); | |
5600 | goto drop; | |
5601 | } | |
5602 | ||
d626f62b | 5603 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5604 | skb->len); |
1da177e4 LT |
5605 | conn->rx_len -= skb->len; |
5606 | ||
5607 | if (!conn->rx_len) { | |
5608 | /* Complete frame received */ | |
5609 | l2cap_recv_frame(conn, conn->rx_skb); | |
5610 | conn->rx_skb = NULL; | |
5611 | } | |
5612 | } | |
5613 | ||
5614 | drop: | |
5615 | kfree_skb(skb); | |
5616 | return 0; | |
5617 | } | |
5618 | ||
aef7d97c | 5619 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5620 | { |
23691d75 | 5621 | struct l2cap_chan *c; |
1da177e4 | 5622 | |
333055f2 | 5623 | read_lock(&chan_list_lock); |
1da177e4 | 5624 | |
23691d75 GP |
5625 | list_for_each_entry(c, &chan_list, global_l) { |
5626 | struct sock *sk = c->sk; | |
101545f6 | 5627 | |
903d343e | 5628 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5629 | batostr(&bt_sk(sk)->src), |
5630 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5631 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5632 | c->scid, c->dcid, c->imtu, c->omtu, |
5633 | c->sec_level, c->mode); | |
61e1b4b7 | 5634 | } |
1da177e4 | 5635 | |
333055f2 | 5636 | read_unlock(&chan_list_lock); |
1da177e4 | 5637 | |
aef7d97c | 5638 | return 0; |
1da177e4 LT |
5639 | } |
5640 | ||
aef7d97c MH |
5641 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5642 | { | |
5643 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5644 | } | |
5645 | ||
5646 | static const struct file_operations l2cap_debugfs_fops = { | |
5647 | .open = l2cap_debugfs_open, | |
5648 | .read = seq_read, | |
5649 | .llseek = seq_lseek, | |
5650 | .release = single_release, | |
5651 | }; | |
5652 | ||
5653 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5654 | |
64274518 | 5655 | int __init l2cap_init(void) |
1da177e4 LT |
5656 | { |
5657 | int err; | |
be9d1227 | 5658 | |
bb58f747 | 5659 | err = l2cap_init_sockets(); |
1da177e4 LT |
5660 | if (err < 0) |
5661 | return err; | |
5662 | ||
aef7d97c MH |
5663 | if (bt_debugfs) { |
5664 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5665 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5666 | if (!l2cap_debugfs) | |
5667 | BT_ERR("Failed to create L2CAP debug file"); | |
5668 | } | |
1da177e4 | 5669 | |
1da177e4 | 5670 | return 0; |
1da177e4 LT |
5671 | } |
5672 | ||
64274518 | 5673 | void l2cap_exit(void) |
1da177e4 | 5674 | { |
aef7d97c | 5675 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5676 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5677 | } |
5678 | ||
d1c4a17d GP |
5679 | module_param(disable_ertm, bool, 0644); |
5680 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |