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> |
97e8e89d | 40 | #include <net/bluetooth/a2mp.h> |
5ce66b59 | 41 | #include <net/bluetooth/amp.h> |
1da177e4 | 42 | |
d1de6d46 | 43 | bool disable_ertm; |
f0709e03 | 44 | |
47ec1dcd | 45 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 46 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 47 | |
b5ad8b7f JB |
48 | static LIST_HEAD(chan_list); |
49 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 50 | |
1da177e4 | 51 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 52 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 53 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 54 | void *data); |
710f9b0a | 55 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 56 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 57 | |
d660366d | 58 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 59 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 60 | |
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
2d792818 GP |
63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
64 | u16 cid) | |
0139418c | 65 | { |
3df91ea2 | 66 | struct l2cap_chan *c; |
3d57dc68 | 67 | |
3df91ea2 AE |
68 | list_for_each_entry(c, &conn->chan_l, list) { |
69 | if (c->dcid == cid) | |
70 | return c; | |
0139418c | 71 | } |
3df91ea2 | 72 | return NULL; |
0139418c MH |
73 | } |
74 | ||
2d792818 GP |
75 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
76 | u16 cid) | |
0139418c | 77 | { |
3df91ea2 | 78 | struct l2cap_chan *c; |
3d57dc68 | 79 | |
3df91ea2 AE |
80 | list_for_each_entry(c, &conn->chan_l, list) { |
81 | if (c->scid == cid) | |
82 | return c; | |
0139418c | 83 | } |
3df91ea2 | 84 | return NULL; |
0139418c MH |
85 | } |
86 | ||
87 | /* Find channel with given SCID. | |
ef191ade | 88 | * Returns locked channel. */ |
2d792818 GP |
89 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
90 | u16 cid) | |
0139418c | 91 | { |
48454079 | 92 | struct l2cap_chan *c; |
baa7e1fa | 93 | |
3df91ea2 | 94 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 95 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
96 | if (c) |
97 | l2cap_chan_lock(c); | |
3df91ea2 AE |
98 | mutex_unlock(&conn->chan_lock); |
99 | ||
48454079 | 100 | return c; |
0139418c MH |
101 | } |
102 | ||
b1a130b7 MM |
103 | /* Find channel with given DCID. |
104 | * Returns locked channel. | |
105 | */ | |
106 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
107 | u16 cid) | |
108 | { | |
109 | struct l2cap_chan *c; | |
110 | ||
111 | mutex_lock(&conn->chan_lock); | |
112 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
113 | if (c) | |
114 | l2cap_chan_lock(c); | |
115 | mutex_unlock(&conn->chan_lock); | |
116 | ||
117 | return c; | |
118 | } | |
119 | ||
2d792818 GP |
120 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
121 | u8 ident) | |
0139418c | 122 | { |
3df91ea2 | 123 | struct l2cap_chan *c; |
3d57dc68 | 124 | |
3df91ea2 AE |
125 | list_for_each_entry(c, &conn->chan_l, list) { |
126 | if (c->ident == ident) | |
127 | return c; | |
0139418c | 128 | } |
3df91ea2 | 129 | return NULL; |
0139418c MH |
130 | } |
131 | ||
5b155ef9 MM |
132 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
133 | u8 ident) | |
134 | { | |
135 | struct l2cap_chan *c; | |
136 | ||
137 | mutex_lock(&conn->chan_lock); | |
138 | c = __l2cap_get_chan_by_ident(conn, ident); | |
139 | if (c) | |
140 | l2cap_chan_lock(c); | |
141 | mutex_unlock(&conn->chan_lock); | |
142 | ||
143 | return c; | |
144 | } | |
145 | ||
23691d75 | 146 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 147 | { |
23691d75 | 148 | struct l2cap_chan *c; |
9e4425ff | 149 | |
23691d75 GP |
150 | list_for_each_entry(c, &chan_list, global_l) { |
151 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 152 | return c; |
9e4425ff | 153 | } |
250938cb | 154 | return NULL; |
9e4425ff GP |
155 | } |
156 | ||
157 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
158 | { | |
73b2ec18 GP |
159 | int err; |
160 | ||
333055f2 | 161 | write_lock(&chan_list_lock); |
9e4425ff | 162 | |
23691d75 | 163 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
164 | err = -EADDRINUSE; |
165 | goto done; | |
9e4425ff GP |
166 | } |
167 | ||
73b2ec18 GP |
168 | if (psm) { |
169 | chan->psm = psm; | |
170 | chan->sport = psm; | |
171 | err = 0; | |
172 | } else { | |
173 | u16 p; | |
174 | ||
175 | err = -EINVAL; | |
176 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 177 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
178 | chan->psm = cpu_to_le16(p); |
179 | chan->sport = cpu_to_le16(p); | |
180 | err = 0; | |
181 | break; | |
182 | } | |
183 | } | |
9e4425ff | 184 | |
73b2ec18 | 185 | done: |
333055f2 | 186 | write_unlock(&chan_list_lock); |
73b2ec18 | 187 | return err; |
9e4425ff GP |
188 | } |
189 | ||
190 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
191 | { | |
333055f2 | 192 | write_lock(&chan_list_lock); |
9e4425ff GP |
193 | |
194 | chan->scid = scid; | |
195 | ||
333055f2 | 196 | write_unlock(&chan_list_lock); |
9e4425ff GP |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
baa7e1fa | 201 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 202 | { |
8db4dc46 | 203 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 204 | |
8db4dc46 | 205 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 206 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
207 | return cid; |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
0e587be7 | 213 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 214 | { |
42d2d87c | 215 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 216 | state_to_string(state)); |
badaaa00 | 217 | |
89bc500e | 218 | chan->state = state; |
80b98027 | 219 | chan->ops->state_change(chan, state); |
89bc500e GP |
220 | } |
221 | ||
0e587be7 AE |
222 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
223 | { | |
224 | struct sock *sk = chan->sk; | |
225 | ||
226 | lock_sock(sk); | |
227 | __l2cap_state_change(chan, state); | |
228 | release_sock(sk); | |
229 | } | |
230 | ||
2e0052e4 AE |
231 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
232 | { | |
233 | struct sock *sk = chan->sk; | |
234 | ||
235 | sk->sk_err = err; | |
236 | } | |
237 | ||
238 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
239 | { | |
240 | struct sock *sk = chan->sk; | |
241 | ||
242 | lock_sock(sk); | |
243 | __l2cap_chan_set_err(chan, err); | |
244 | release_sock(sk); | |
245 | } | |
246 | ||
4239d16f MM |
247 | static void __set_retrans_timer(struct l2cap_chan *chan) |
248 | { | |
249 | if (!delayed_work_pending(&chan->monitor_timer) && | |
250 | chan->retrans_timeout) { | |
251 | l2cap_set_timer(chan, &chan->retrans_timer, | |
252 | msecs_to_jiffies(chan->retrans_timeout)); | |
253 | } | |
254 | } | |
255 | ||
256 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
257 | { | |
258 | __clear_retrans_timer(chan); | |
259 | if (chan->monitor_timeout) { | |
260 | l2cap_set_timer(chan, &chan->monitor_timer, | |
261 | msecs_to_jiffies(chan->monitor_timeout)); | |
262 | } | |
263 | } | |
264 | ||
608bcc6d MM |
265 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
266 | u16 seq) | |
267 | { | |
268 | struct sk_buff *skb; | |
269 | ||
270 | skb_queue_walk(head, skb) { | |
271 | if (bt_cb(skb)->control.txseq == seq) | |
272 | return skb; | |
273 | } | |
274 | ||
275 | return NULL; | |
276 | } | |
277 | ||
3c588192 MM |
278 | /* ---- L2CAP sequence number lists ---- */ |
279 | ||
280 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
281 | * SREJ requests that are received and for frames that are to be | |
282 | * retransmitted. These seq_list functions implement a singly-linked | |
283 | * list in an array, where membership in the list can also be checked | |
284 | * in constant time. Items can also be added to the tail of the list | |
285 | * and removed from the head in constant time, without further memory | |
286 | * allocs or frees. | |
287 | */ | |
288 | ||
289 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
290 | { | |
291 | size_t alloc_size, i; | |
292 | ||
293 | /* Allocated size is a power of 2 to map sequence numbers | |
294 | * (which may be up to 14 bits) in to a smaller array that is | |
295 | * sized for the negotiated ERTM transmit windows. | |
296 | */ | |
297 | alloc_size = roundup_pow_of_two(size); | |
298 | ||
299 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
300 | if (!seq_list->list) | |
301 | return -ENOMEM; | |
302 | ||
303 | seq_list->mask = alloc_size - 1; | |
304 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
305 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
306 | for (i = 0; i < alloc_size; i++) | |
307 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
313 | { | |
314 | kfree(seq_list->list); | |
315 | } | |
316 | ||
317 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
318 | u16 seq) | |
319 | { | |
320 | /* Constant-time check for list membership */ | |
321 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
322 | } | |
323 | ||
324 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
325 | { | |
326 | u16 mask = seq_list->mask; | |
327 | ||
328 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
329 | /* In case someone tries to pop the head of an empty list */ | |
330 | return L2CAP_SEQ_LIST_CLEAR; | |
331 | } else if (seq_list->head == seq) { | |
332 | /* Head can be removed in constant time */ | |
333 | seq_list->head = seq_list->list[seq & mask]; | |
334 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
335 | ||
336 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
337 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
338 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
339 | } | |
340 | } else { | |
341 | /* Walk the list to find the sequence number */ | |
342 | u16 prev = seq_list->head; | |
343 | while (seq_list->list[prev & mask] != seq) { | |
344 | prev = seq_list->list[prev & mask]; | |
345 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
346 | return L2CAP_SEQ_LIST_CLEAR; | |
347 | } | |
348 | ||
349 | /* Unlink the number from the list and clear it */ | |
350 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
351 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
352 | if (seq_list->tail == seq) | |
353 | seq_list->tail = prev; | |
354 | } | |
355 | return seq; | |
356 | } | |
357 | ||
358 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
359 | { | |
360 | /* Remove the head in constant time */ | |
361 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
362 | } | |
363 | ||
364 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
365 | { | |
f522ae36 | 366 | u16 i; |
3c588192 | 367 | |
f522ae36 GP |
368 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
369 | return; | |
370 | ||
371 | for (i = 0; i <= seq_list->mask; i++) | |
372 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
373 | ||
374 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
375 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
376 | } |
377 | ||
378 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
379 | { | |
380 | u16 mask = seq_list->mask; | |
381 | ||
382 | /* All appends happen in constant time */ | |
383 | ||
f522ae36 GP |
384 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
385 | return; | |
3c588192 | 386 | |
f522ae36 GP |
387 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
388 | seq_list->head = seq; | |
389 | else | |
390 | seq_list->list[seq_list->tail & mask] = seq; | |
391 | ||
392 | seq_list->tail = seq; | |
393 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
394 | } |
395 | ||
721c4181 | 396 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 397 | { |
721c4181 | 398 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 399 | chan_timer.work); |
3df91ea2 | 400 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
401 | int reason; |
402 | ||
e05dcc32 | 403 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 404 | |
3df91ea2 | 405 | mutex_lock(&conn->chan_lock); |
6be36555 | 406 | l2cap_chan_lock(chan); |
ab07801d | 407 | |
89bc500e | 408 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 409 | reason = ECONNREFUSED; |
89bc500e | 410 | else if (chan->state == BT_CONNECT && |
2d792818 | 411 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
412 | reason = ECONNREFUSED; |
413 | else | |
414 | reason = ETIMEDOUT; | |
415 | ||
0f852724 | 416 | l2cap_chan_close(chan, reason); |
ab07801d | 417 | |
6be36555 | 418 | l2cap_chan_unlock(chan); |
ab07801d | 419 | |
80b98027 | 420 | chan->ops->close(chan); |
3df91ea2 AE |
421 | mutex_unlock(&conn->chan_lock); |
422 | ||
371fd835 | 423 | l2cap_chan_put(chan); |
ab07801d GP |
424 | } |
425 | ||
eef1d9b6 | 426 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
427 | { |
428 | struct l2cap_chan *chan; | |
429 | ||
430 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
431 | if (!chan) | |
432 | return NULL; | |
433 | ||
c03b355e AE |
434 | mutex_init(&chan->lock); |
435 | ||
333055f2 | 436 | write_lock(&chan_list_lock); |
23691d75 | 437 | list_add(&chan->global_l, &chan_list); |
333055f2 | 438 | write_unlock(&chan_list_lock); |
23691d75 | 439 | |
721c4181 | 440 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 441 | |
89bc500e GP |
442 | chan->state = BT_OPEN; |
443 | ||
144ad330 | 444 | kref_init(&chan->kref); |
71ba0e56 | 445 | |
2827011f MM |
446 | /* This flag is cleared in l2cap_chan_ready() */ |
447 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
448 | ||
eef1d9b6 | 449 | BT_DBG("chan %p", chan); |
abc545b8 | 450 | |
48454079 GP |
451 | return chan; |
452 | } | |
453 | ||
144ad330 | 454 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 455 | { |
144ad330 SS |
456 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
457 | ||
4af66c69 JK |
458 | BT_DBG("chan %p", chan); |
459 | ||
333055f2 | 460 | write_lock(&chan_list_lock); |
23691d75 | 461 | list_del(&chan->global_l); |
333055f2 | 462 | write_unlock(&chan_list_lock); |
23691d75 | 463 | |
4af66c69 | 464 | kfree(chan); |
6ff5abbf GP |
465 | } |
466 | ||
30648372 JK |
467 | void l2cap_chan_hold(struct l2cap_chan *c) |
468 | { | |
144ad330 | 469 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 470 | |
144ad330 | 471 | kref_get(&c->kref); |
30648372 JK |
472 | } |
473 | ||
474 | void l2cap_chan_put(struct l2cap_chan *c) | |
475 | { | |
144ad330 | 476 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 477 | |
144ad330 | 478 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
479 | } |
480 | ||
bd4b1653 AE |
481 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
482 | { | |
483 | chan->fcs = L2CAP_FCS_CRC16; | |
484 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
485 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
486 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 487 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
488 | chan->sec_level = BT_SECURITY_LOW; |
489 | ||
490 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
491 | } | |
492 | ||
93c3e8f5 | 493 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 494 | { |
af05b30b | 495 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 496 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 497 | |
9f5a0d7b | 498 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 499 | |
8c1d787b | 500 | chan->conn = conn; |
0139418c | 501 | |
5491120e AE |
502 | switch (chan->chan_type) { |
503 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
504 | if (conn->hcon->type == LE_LINK) { |
505 | /* LE connection */ | |
6fcb06a2 | 506 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
507 | chan->scid = L2CAP_CID_LE_DATA; |
508 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
509 | } else { |
510 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 511 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 512 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 513 | } |
5491120e AE |
514 | break; |
515 | ||
516 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 517 | /* Connectionless socket */ |
fe4128e0 GP |
518 | chan->scid = L2CAP_CID_CONN_LESS; |
519 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 520 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
521 | break; |
522 | ||
416fa752 AE |
523 | case L2CAP_CHAN_CONN_FIX_A2MP: |
524 | chan->scid = L2CAP_CID_A2MP; | |
525 | chan->dcid = L2CAP_CID_A2MP; | |
526 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
527 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
528 | break; | |
529 | ||
5491120e | 530 | default: |
0139418c | 531 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
532 | chan->scid = L2CAP_CID_SIGNALING; |
533 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 534 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
535 | } |
536 | ||
8f7975b1 AE |
537 | chan->local_id = L2CAP_BESTEFFORT_ID; |
538 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
539 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
540 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
541 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 542 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 543 | |
371fd835 | 544 | l2cap_chan_hold(chan); |
baa7e1fa | 545 | |
3df91ea2 | 546 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
547 | } |
548 | ||
466f8004 | 549 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
550 | { |
551 | mutex_lock(&conn->chan_lock); | |
552 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 553 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
554 | } |
555 | ||
466f8004 | 556 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 557 | { |
8c1d787b | 558 | struct l2cap_conn *conn = chan->conn; |
0139418c | 559 | |
c9b66675 | 560 | __clear_chan_timer(chan); |
0139418c | 561 | |
49208c9c | 562 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 563 | |
8e87d142 | 564 | if (conn) { |
56f60984 | 565 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 566 | /* Delete from channel list */ |
3df91ea2 | 567 | list_del(&chan->list); |
3d57dc68 | 568 | |
371fd835 | 569 | l2cap_chan_put(chan); |
baa7e1fa | 570 | |
8c1d787b | 571 | chan->conn = NULL; |
3cabbfda AE |
572 | |
573 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
76a68ba0 | 574 | hci_conn_drop(conn->hcon); |
56f60984 AE |
575 | |
576 | if (mgr && mgr->bredr_chan == chan) | |
577 | mgr->bredr_chan = NULL; | |
0139418c MH |
578 | } |
579 | ||
419e08c1 AE |
580 | if (chan->hs_hchan) { |
581 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
582 | ||
583 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
584 | amp_disconnect_logical_link(hs_hchan); | |
585 | } | |
586 | ||
b699ec0d | 587 | chan->ops->teardown(chan, err); |
6be36555 | 588 | |
2827011f | 589 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 590 | return; |
2ead70b8 | 591 | |
ee556f66 GP |
592 | switch(chan->mode) { |
593 | case L2CAP_MODE_BASIC: | |
594 | break; | |
c13ffa62 | 595 | |
ee556f66 | 596 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
597 | __clear_retrans_timer(chan); |
598 | __clear_monitor_timer(chan); | |
599 | __clear_ack_timer(chan); | |
c13ffa62 | 600 | |
f1c6775b | 601 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 602 | |
3c588192 MM |
603 | l2cap_seq_list_free(&chan->srej_list); |
604 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
605 | |
606 | /* fall through */ | |
607 | ||
608 | case L2CAP_MODE_STREAMING: | |
609 | skb_queue_purge(&chan->tx_q); | |
610 | break; | |
c13ffa62 | 611 | } |
ee556f66 GP |
612 | |
613 | return; | |
0139418c MH |
614 | } |
615 | ||
0f852724 | 616 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
617 | { |
618 | struct l2cap_conn *conn = chan->conn; | |
619 | struct sock *sk = chan->sk; | |
620 | ||
2d792818 GP |
621 | BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
622 | sk); | |
4519de9a | 623 | |
89bc500e | 624 | switch (chan->state) { |
4519de9a | 625 | case BT_LISTEN: |
b699ec0d | 626 | chan->ops->teardown(chan, 0); |
4519de9a GP |
627 | break; |
628 | ||
629 | case BT_CONNECTED: | |
630 | case BT_CONFIG: | |
715ec005 | 631 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 632 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 633 | __set_chan_timer(chan, sk->sk_sndtimeo); |
5e4e3972 | 634 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
635 | } else |
636 | l2cap_chan_del(chan, reason); | |
637 | break; | |
638 | ||
639 | case BT_CONNECT2: | |
715ec005 | 640 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 641 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
642 | struct l2cap_conn_rsp rsp; |
643 | __u16 result; | |
644 | ||
c5daa683 | 645 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
646 | result = L2CAP_CR_SEC_BLOCK; |
647 | else | |
648 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 649 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
650 | |
651 | rsp.scid = cpu_to_le16(chan->dcid); | |
652 | rsp.dcid = cpu_to_le16(chan->scid); | |
653 | rsp.result = cpu_to_le16(result); | |
ac73498c | 654 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 655 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 656 | sizeof(rsp), &rsp); |
4519de9a GP |
657 | } |
658 | ||
659 | l2cap_chan_del(chan, reason); | |
660 | break; | |
661 | ||
662 | case BT_CONNECT: | |
663 | case BT_DISCONN: | |
664 | l2cap_chan_del(chan, reason); | |
665 | break; | |
666 | ||
667 | default: | |
b699ec0d | 668 | chan->ops->teardown(chan, 0); |
4519de9a GP |
669 | break; |
670 | } | |
671 | } | |
672 | ||
4343478f | 673 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 674 | { |
715ec005 | 675 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 676 | switch (chan->sec_level) { |
8556edd3 JH |
677 | case BT_SECURITY_HIGH: |
678 | return HCI_AT_DEDICATED_BONDING_MITM; | |
679 | case BT_SECURITY_MEDIUM: | |
680 | return HCI_AT_DEDICATED_BONDING; | |
681 | default: | |
682 | return HCI_AT_NO_BONDING; | |
683 | } | |
2983fd68 | 684 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
685 | if (chan->sec_level == BT_SECURITY_LOW) |
686 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 687 | |
4343478f | 688 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 689 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 690 | else |
8556edd3 | 691 | return HCI_AT_NO_BONDING; |
00ae4af9 | 692 | } else { |
4343478f | 693 | switch (chan->sec_level) { |
00ae4af9 | 694 | case BT_SECURITY_HIGH: |
8556edd3 | 695 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 696 | case BT_SECURITY_MEDIUM: |
8556edd3 | 697 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 698 | default: |
8556edd3 | 699 | return HCI_AT_NO_BONDING; |
00ae4af9 | 700 | } |
0684e5f9 | 701 | } |
8556edd3 JH |
702 | } |
703 | ||
704 | /* Service level security */ | |
d45fc423 | 705 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 706 | { |
8c1d787b | 707 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
708 | __u8 auth_type; |
709 | ||
4343478f | 710 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 711 | |
4343478f | 712 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
713 | } |
714 | ||
b5ad8b7f | 715 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
716 | { |
717 | u8 id; | |
718 | ||
719 | /* Get next available identificator. | |
720 | * 1 - 128 are used by kernel. | |
721 | * 129 - 199 are reserved. | |
722 | * 200 - 254 are used by utilities like l2ping, etc. | |
723 | */ | |
724 | ||
333055f2 | 725 | spin_lock(&conn->lock); |
4e8402a3 MH |
726 | |
727 | if (++conn->tx_ident > 128) | |
728 | conn->tx_ident = 1; | |
729 | ||
730 | id = conn->tx_ident; | |
731 | ||
333055f2 | 732 | spin_unlock(&conn->lock); |
4e8402a3 MH |
733 | |
734 | return id; | |
735 | } | |
736 | ||
2d792818 GP |
737 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
738 | void *data) | |
4e8402a3 MH |
739 | { |
740 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 741 | u8 flags; |
4e8402a3 MH |
742 | |
743 | BT_DBG("code 0x%2.2x", code); | |
744 | ||
745 | if (!skb) | |
9a9c6a34 | 746 | return; |
4e8402a3 | 747 | |
e702112f AE |
748 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
749 | flags = ACL_START_NO_FLUSH; | |
750 | else | |
751 | flags = ACL_START; | |
752 | ||
14b12d0b | 753 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 754 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 755 | |
73d80deb LAD |
756 | hci_send_acl(conn->hchan, skb, flags); |
757 | } | |
758 | ||
02b0fbb9 MM |
759 | static bool __chan_is_moving(struct l2cap_chan *chan) |
760 | { | |
761 | return chan->move_state != L2CAP_MOVE_STABLE && | |
762 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
763 | } | |
764 | ||
73d80deb LAD |
765 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
766 | { | |
767 | struct hci_conn *hcon = chan->conn->hcon; | |
768 | u16 flags; | |
769 | ||
770 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 771 | skb->priority); |
73d80deb | 772 | |
d5f8a75d MM |
773 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
774 | if (chan->hs_hchan) | |
775 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
776 | else | |
777 | kfree_skb(skb); | |
778 | ||
779 | return; | |
780 | } | |
781 | ||
73d80deb | 782 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 783 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
784 | flags = ACL_START_NO_FLUSH; |
785 | else | |
786 | flags = ACL_START; | |
14b12d0b | 787 | |
73d80deb LAD |
788 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
789 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
790 | } |
791 | ||
b76bbd66 MM |
792 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
793 | { | |
794 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
795 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
796 | ||
797 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
798 | /* S-Frame */ | |
799 | control->sframe = 1; | |
800 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
801 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
802 | ||
803 | control->sar = 0; | |
804 | control->txseq = 0; | |
805 | } else { | |
806 | /* I-Frame */ | |
807 | control->sframe = 0; | |
808 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
809 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
810 | ||
811 | control->poll = 0; | |
812 | control->super = 0; | |
813 | } | |
814 | } | |
815 | ||
b76bbd66 MM |
816 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
817 | { | |
818 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
819 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
820 | ||
821 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
822 | /* S-Frame */ | |
823 | control->sframe = 1; | |
824 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
825 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
826 | ||
827 | control->sar = 0; | |
828 | control->txseq = 0; | |
829 | } else { | |
830 | /* I-Frame */ | |
831 | control->sframe = 0; | |
832 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
833 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
834 | ||
835 | control->poll = 0; | |
836 | control->super = 0; | |
837 | } | |
838 | } | |
839 | ||
840 | static inline void __unpack_control(struct l2cap_chan *chan, | |
841 | struct sk_buff *skb) | |
842 | { | |
843 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
844 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
845 | &bt_cb(skb)->control); | |
cec8ab6e | 846 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
847 | } else { |
848 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
849 | &bt_cb(skb)->control); | |
cec8ab6e | 850 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
851 | } |
852 | } | |
853 | ||
b5c6aaed MM |
854 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
855 | { | |
856 | u32 packed; | |
857 | ||
858 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
859 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
860 | ||
861 | if (control->sframe) { | |
862 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
863 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
864 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
865 | } else { | |
866 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
867 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
868 | } | |
869 | ||
870 | return packed; | |
871 | } | |
872 | ||
873 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
874 | { | |
875 | u16 packed; | |
876 | ||
877 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
878 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
879 | ||
880 | if (control->sframe) { | |
881 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
882 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
883 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
884 | } else { | |
885 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
886 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
887 | } | |
888 | ||
889 | return packed; | |
890 | } | |
891 | ||
b76bbd66 MM |
892 | static inline void __pack_control(struct l2cap_chan *chan, |
893 | struct l2cap_ctrl *control, | |
894 | struct sk_buff *skb) | |
895 | { | |
896 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
897 | put_unaligned_le32(__pack_extended_control(control), | |
898 | skb->data + L2CAP_HDR_SIZE); | |
899 | } else { | |
900 | put_unaligned_le16(__pack_enhanced_control(control), | |
901 | skb->data + L2CAP_HDR_SIZE); | |
902 | } | |
903 | } | |
904 | ||
ba7aa64f GP |
905 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
906 | { | |
907 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
908 | return L2CAP_EXT_HDR_SIZE; | |
909 | else | |
910 | return L2CAP_ENH_HDR_SIZE; | |
911 | } | |
912 | ||
a67d7f6f MM |
913 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
914 | u32 control) | |
b5c6aaed MM |
915 | { |
916 | struct sk_buff *skb; | |
917 | struct l2cap_hdr *lh; | |
ba7aa64f | 918 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
919 | |
920 | if (chan->fcs == L2CAP_FCS_CRC16) | |
921 | hlen += L2CAP_FCS_SIZE; | |
922 | ||
a67d7f6f | 923 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 924 | |
b5c6aaed | 925 | if (!skb) |
a67d7f6f | 926 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
927 | |
928 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
929 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
930 | lh->cid = cpu_to_le16(chan->dcid); | |
931 | ||
a67d7f6f MM |
932 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
933 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
934 | else | |
935 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
936 | |
937 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 938 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
939 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
940 | } | |
941 | ||
942 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
943 | return skb; |
944 | } | |
945 | ||
946 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
947 | struct l2cap_ctrl *control) | |
948 | { | |
949 | struct sk_buff *skb; | |
950 | u32 control_field; | |
951 | ||
952 | BT_DBG("chan %p, control %p", chan, control); | |
953 | ||
954 | if (!control->sframe) | |
955 | return; | |
956 | ||
b99e13ad MM |
957 | if (__chan_is_moving(chan)) |
958 | return; | |
959 | ||
a67d7f6f MM |
960 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
961 | !control->poll) | |
962 | control->final = 1; | |
963 | ||
964 | if (control->super == L2CAP_SUPER_RR) | |
965 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
966 | else if (control->super == L2CAP_SUPER_RNR) | |
967 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
968 | ||
969 | if (control->super != L2CAP_SUPER_SREJ) { | |
970 | chan->last_acked_seq = control->reqseq; | |
971 | __clear_ack_timer(chan); | |
972 | } | |
973 | ||
974 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
975 | control->final, control->poll, control->super); | |
976 | ||
977 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
978 | control_field = __pack_extended_control(control); | |
979 | else | |
980 | control_field = __pack_enhanced_control(control); | |
981 | ||
982 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
983 | if (!IS_ERR(skb)) | |
984 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
985 | } |
986 | ||
c9e3d5e0 | 987 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 988 | { |
c9e3d5e0 MM |
989 | struct l2cap_ctrl control; |
990 | ||
991 | BT_DBG("chan %p, poll %d", chan, poll); | |
992 | ||
993 | memset(&control, 0, sizeof(control)); | |
994 | control.sframe = 1; | |
995 | control.poll = poll; | |
996 | ||
997 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
998 | control.super = L2CAP_SUPER_RNR; | |
999 | else | |
1000 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1001 | |
c9e3d5e0 MM |
1002 | control.reqseq = chan->buffer_seq; |
1003 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1004 | } |
1005 | ||
b4450035 | 1006 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1007 | { |
c1360a1c | 1008 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1009 | } |
1010 | ||
93c3e8f5 AE |
1011 | static bool __amp_capable(struct l2cap_chan *chan) |
1012 | { | |
1013 | struct l2cap_conn *conn = chan->conn; | |
1014 | ||
1015 | if (enable_hs && | |
5d05416e | 1016 | hci_amp_capable() && |
93c3e8f5 AE |
1017 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && |
1018 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
1019 | return true; | |
1020 | else | |
1021 | return false; | |
1022 | } | |
1023 | ||
5ce66b59 AE |
1024 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1025 | { | |
1026 | /* Check EFS parameters */ | |
1027 | return true; | |
1028 | } | |
1029 | ||
2766be48 | 1030 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1031 | { |
1032 | struct l2cap_conn *conn = chan->conn; | |
1033 | struct l2cap_conn_req req; | |
1034 | ||
1035 | req.scid = cpu_to_le16(chan->scid); | |
1036 | req.psm = chan->psm; | |
1037 | ||
1038 | chan->ident = l2cap_get_ident(conn); | |
1039 | ||
1040 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1041 | ||
1042 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1043 | } | |
1044 | ||
8eb200bd MM |
1045 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1046 | { | |
1047 | struct l2cap_create_chan_req req; | |
1048 | req.scid = cpu_to_le16(chan->scid); | |
1049 | req.psm = chan->psm; | |
1050 | req.amp_id = amp_id; | |
1051 | ||
1052 | chan->ident = l2cap_get_ident(chan->conn); | |
1053 | ||
1054 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1055 | sizeof(req), &req); | |
1056 | } | |
1057 | ||
02b0fbb9 MM |
1058 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1059 | { | |
1060 | struct sk_buff *skb; | |
1061 | ||
1062 | BT_DBG("chan %p", chan); | |
1063 | ||
1064 | if (chan->mode != L2CAP_MODE_ERTM) | |
1065 | return; | |
1066 | ||
1067 | __clear_retrans_timer(chan); | |
1068 | __clear_monitor_timer(chan); | |
1069 | __clear_ack_timer(chan); | |
1070 | ||
1071 | chan->retry_count = 0; | |
1072 | skb_queue_walk(&chan->tx_q, skb) { | |
1073 | if (bt_cb(skb)->control.retries) | |
1074 | bt_cb(skb)->control.retries = 1; | |
1075 | else | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | chan->expected_tx_seq = chan->buffer_seq; | |
1080 | ||
1081 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1082 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1083 | l2cap_seq_list_clear(&chan->retrans_list); | |
1084 | l2cap_seq_list_clear(&chan->srej_list); | |
1085 | skb_queue_purge(&chan->srej_q); | |
1086 | ||
1087 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1088 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1089 | ||
1090 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1091 | } | |
1092 | ||
5f3847a4 MM |
1093 | static void l2cap_move_done(struct l2cap_chan *chan) |
1094 | { | |
1095 | u8 move_role = chan->move_role; | |
1096 | BT_DBG("chan %p", chan); | |
1097 | ||
1098 | chan->move_state = L2CAP_MOVE_STABLE; | |
1099 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1100 | ||
1101 | if (chan->mode != L2CAP_MODE_ERTM) | |
1102 | return; | |
1103 | ||
1104 | switch (move_role) { | |
1105 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1106 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1107 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1108 | break; | |
1109 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1110 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1111 | break; | |
1112 | } | |
1113 | } | |
1114 | ||
9f0caeb1 VCG |
1115 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1116 | { | |
2827011f | 1117 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1118 | chan->conf_state = 0; |
1119 | __clear_chan_timer(chan); | |
1120 | ||
54a59aa2 | 1121 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1122 | |
fd83e2c2 | 1123 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1124 | } |
1125 | ||
93c3e8f5 AE |
1126 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1127 | { | |
1128 | if (__amp_capable(chan)) { | |
1129 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1130 | a2mp_discover_amp(chan); | |
1131 | } else { | |
1132 | l2cap_send_conn_req(chan); | |
1133 | } | |
1134 | } | |
1135 | ||
fc7f8a7e | 1136 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1137 | { |
8c1d787b | 1138 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1139 | |
9f0caeb1 VCG |
1140 | if (conn->hcon->type == LE_LINK) { |
1141 | l2cap_chan_ready(chan); | |
1142 | return; | |
1143 | } | |
1144 | ||
79d554a6 | 1145 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1146 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1147 | return; | |
1148 | ||
d45fc423 | 1149 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1150 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1151 | l2cap_start_connection(chan); |
1152 | } | |
79d554a6 MH |
1153 | } else { |
1154 | struct l2cap_info_req req; | |
ac73498c | 1155 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1156 | |
1157 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1158 | conn->info_ident = l2cap_get_ident(conn); | |
1159 | ||
ba13ccd9 | 1160 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1161 | |
2d792818 GP |
1162 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1163 | sizeof(req), &req); | |
79d554a6 MH |
1164 | } |
1165 | } | |
1166 | ||
cf6c2c0b GP |
1167 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1168 | { | |
1169 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1170 | if (!disable_ertm) |
cf6c2c0b GP |
1171 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1172 | ||
1173 | switch (mode) { | |
1174 | case L2CAP_MODE_ERTM: | |
1175 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1176 | case L2CAP_MODE_STREAMING: | |
1177 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1178 | default: | |
1179 | return 0x00; | |
1180 | } | |
1181 | } | |
1182 | ||
5e4e3972 | 1183 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1184 | { |
6be36555 | 1185 | struct sock *sk = chan->sk; |
5e4e3972 | 1186 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1187 | struct l2cap_disconn_req req; |
1188 | ||
c13ffa62 GP |
1189 | if (!conn) |
1190 | return; | |
1191 | ||
aad3d0e3 | 1192 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1193 | __clear_retrans_timer(chan); |
1194 | __clear_monitor_timer(chan); | |
1195 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1196 | } |
1197 | ||
416fa752 | 1198 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1199 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1200 | return; |
1201 | } | |
1202 | ||
fe4128e0 GP |
1203 | req.dcid = cpu_to_le16(chan->dcid); |
1204 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1205 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1206 | sizeof(req), &req); | |
c13ffa62 | 1207 | |
6be36555 | 1208 | lock_sock(sk); |
0e587be7 | 1209 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1210 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1211 | release_sock(sk); |
22121fc9 GP |
1212 | } |
1213 | ||
1da177e4 | 1214 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1215 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1216 | { | |
3df91ea2 | 1217 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1218 | |
1219 | BT_DBG("conn %p", conn); | |
1220 | ||
3df91ea2 | 1221 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1222 | |
3df91ea2 | 1223 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1224 | struct sock *sk = chan->sk; |
baa7e1fa | 1225 | |
6be36555 | 1226 | l2cap_chan_lock(chan); |
4e8402a3 | 1227 | |
715ec005 | 1228 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1229 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1230 | continue; |
1231 | } | |
1232 | ||
89bc500e | 1233 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1234 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1235 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1236 | l2cap_chan_unlock(chan); |
47731de7 GP |
1237 | continue; |
1238 | } | |
79d554a6 | 1239 | |
c1360a1c | 1240 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1241 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1242 | &chan->conf_state)) { |
89bc500e | 1243 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1244 | l2cap_chan_unlock(chan); |
47731de7 | 1245 | continue; |
b1235d79 | 1246 | } |
47731de7 | 1247 | |
93c3e8f5 | 1248 | l2cap_start_connection(chan); |
47731de7 | 1249 | |
89bc500e | 1250 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1251 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1252 | char buf[128]; |
fe4128e0 GP |
1253 | rsp.scid = cpu_to_le16(chan->dcid); |
1254 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1255 | |
d45fc423 | 1256 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1257 | lock_sock(sk); |
c5daa683 GP |
1258 | if (test_bit(BT_SK_DEFER_SETUP, |
1259 | &bt_sk(sk)->flags)) { | |
ac73498c AE |
1260 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1261 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1262 | chan->ops->defer(chan); |
f66dc81f MH |
1263 | |
1264 | } else { | |
0e587be7 | 1265 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1266 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1267 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1268 | } |
6be36555 | 1269 | release_sock(sk); |
79d554a6 | 1270 | } else { |
ac73498c AE |
1271 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1272 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1273 | } |
1274 | ||
fc7f8a7e | 1275 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1276 | sizeof(rsp), &rsp); |
e9aeb2dd | 1277 | |
c1360a1c | 1278 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1279 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1280 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1281 | continue; |
1282 | } | |
1283 | ||
c1360a1c | 1284 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1285 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1286 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1287 | chan->num_conf_req++; |
4e8402a3 MH |
1288 | } |
1289 | ||
6be36555 | 1290 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1291 | } |
1292 | ||
3df91ea2 | 1293 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1294 | } |
1295 | ||
c2287681 | 1296 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1297 | * Returns closest match, locked. |
1298 | */ | |
d9b88702 | 1299 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1300 | bdaddr_t *src, |
1301 | bdaddr_t *dst) | |
b62f328b | 1302 | { |
23691d75 | 1303 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1304 | |
23691d75 | 1305 | read_lock(&chan_list_lock); |
b62f328b | 1306 | |
23691d75 GP |
1307 | list_for_each_entry(c, &chan_list, global_l) { |
1308 | struct sock *sk = c->sk; | |
fe4128e0 | 1309 | |
89bc500e | 1310 | if (state && c->state != state) |
b62f328b VT |
1311 | continue; |
1312 | ||
23691d75 | 1313 | if (c->scid == cid) { |
c2287681 IY |
1314 | int src_match, dst_match; |
1315 | int src_any, dst_any; | |
1316 | ||
b62f328b | 1317 | /* Exact match. */ |
c2287681 IY |
1318 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1319 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1320 | if (src_match && dst_match) { | |
23691d75 GP |
1321 | read_unlock(&chan_list_lock); |
1322 | return c; | |
1323 | } | |
b62f328b VT |
1324 | |
1325 | /* Closest match */ | |
c2287681 IY |
1326 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1327 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1328 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1329 | (src_any && dst_any)) | |
23691d75 | 1330 | c1 = c; |
b62f328b VT |
1331 | } |
1332 | } | |
280f294f | 1333 | |
23691d75 | 1334 | read_unlock(&chan_list_lock); |
b62f328b | 1335 | |
23691d75 | 1336 | return c1; |
b62f328b VT |
1337 | } |
1338 | ||
1339 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1340 | { | |
c916fbe4 | 1341 | struct sock *parent, *sk; |
23691d75 | 1342 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1343 | |
1344 | BT_DBG(""); | |
1345 | ||
1346 | /* Check if we have socket listening on cid */ | |
23691d75 | 1347 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1348 | conn->src, conn->dst); |
23691d75 | 1349 | if (!pchan) |
b62f328b VT |
1350 | return; |
1351 | ||
23691d75 GP |
1352 | parent = pchan->sk; |
1353 | ||
aa2ac881 | 1354 | lock_sock(parent); |
62f3a2cf | 1355 | |
80b98027 | 1356 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1357 | if (!chan) |
b62f328b VT |
1358 | goto clean; |
1359 | ||
80808e43 | 1360 | sk = chan->sk; |
5d41ce1d | 1361 | |
b62f328b | 1362 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1363 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1364 | |
b62f328b VT |
1365 | bacpy(&bt_sk(sk)->src, conn->src); |
1366 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1367 | ||
3d57dc68 | 1368 | l2cap_chan_add(conn, chan); |
48454079 | 1369 | |
6754e0df | 1370 | l2cap_chan_ready(chan); |
b62f328b | 1371 | |
b62f328b | 1372 | clean: |
aa2ac881 | 1373 | release_sock(parent); |
b62f328b VT |
1374 | } |
1375 | ||
4e8402a3 MH |
1376 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1377 | { | |
48454079 | 1378 | struct l2cap_chan *chan; |
cc110922 | 1379 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1380 | |
79d554a6 | 1381 | BT_DBG("conn %p", conn); |
4e8402a3 | 1382 | |
cc110922 | 1383 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1384 | l2cap_le_conn_ready(conn); |
1385 | ||
cc110922 VCG |
1386 | if (hcon->out && hcon->type == LE_LINK) |
1387 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1388 | |
3df91ea2 | 1389 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1390 | |
3df91ea2 | 1391 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1392 | |
6be36555 | 1393 | l2cap_chan_lock(chan); |
4e8402a3 | 1394 | |
416fa752 AE |
1395 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1396 | l2cap_chan_unlock(chan); | |
1397 | continue; | |
1398 | } | |
1399 | ||
cc110922 VCG |
1400 | if (hcon->type == LE_LINK) { |
1401 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1402 | l2cap_chan_ready(chan); |
acd7d370 | 1403 | |
63128451 | 1404 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1405 | struct sock *sk = chan->sk; |
c9b66675 | 1406 | __clear_chan_timer(chan); |
6be36555 | 1407 | lock_sock(sk); |
0e587be7 | 1408 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1409 | sk->sk_state_change(sk); |
6be36555 | 1410 | release_sock(sk); |
b501d6a1 | 1411 | |
89bc500e | 1412 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1413 | l2cap_do_start(chan); |
4e8402a3 | 1414 | |
6be36555 | 1415 | l2cap_chan_unlock(chan); |
4e8402a3 | 1416 | } |
79d554a6 | 1417 | |
3df91ea2 | 1418 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1419 | } |
1420 | ||
1421 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1422 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1423 | { | |
48454079 | 1424 | struct l2cap_chan *chan; |
4e8402a3 MH |
1425 | |
1426 | BT_DBG("conn %p", conn); | |
1427 | ||
3df91ea2 | 1428 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1429 | |
3df91ea2 | 1430 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1431 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1432 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1433 | } |
1434 | ||
3df91ea2 | 1435 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1436 | } |
1437 | ||
f878fcad | 1438 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1439 | { |
f878fcad | 1440 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1441 | info_timer.work); |
4e8402a3 | 1442 | |
984947dc | 1443 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1444 | conn->info_ident = 0; |
984947dc | 1445 | |
4e8402a3 MH |
1446 | l2cap_conn_start(conn); |
1447 | } | |
1448 | ||
2c8e1411 DH |
1449 | /* |
1450 | * l2cap_user | |
1451 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1452 | * callback is called during registration. The ->remove callback is called | |
1453 | * during unregistration. | |
1454 | * An l2cap_user object can either be explicitly unregistered or when the | |
1455 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1456 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1457 | * External modules must own a reference to the l2cap_conn object if they intend | |
1458 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1459 | * any time if they don't. | |
1460 | */ | |
1461 | ||
1462 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1463 | { | |
1464 | struct hci_dev *hdev = conn->hcon->hdev; | |
1465 | int ret; | |
1466 | ||
1467 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1468 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1469 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1470 | * relies on the parent hci_conn object to be locked. This itself relies | |
1471 | * on the hci_dev object to be locked. So we must lock the hci device | |
1472 | * here, too. */ | |
1473 | ||
1474 | hci_dev_lock(hdev); | |
1475 | ||
1476 | if (user->list.next || user->list.prev) { | |
1477 | ret = -EINVAL; | |
1478 | goto out_unlock; | |
1479 | } | |
1480 | ||
1481 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1482 | if (!conn->hchan) { | |
1483 | ret = -ENODEV; | |
1484 | goto out_unlock; | |
1485 | } | |
1486 | ||
1487 | ret = user->probe(conn, user); | |
1488 | if (ret) | |
1489 | goto out_unlock; | |
1490 | ||
1491 | list_add(&user->list, &conn->users); | |
1492 | ret = 0; | |
1493 | ||
1494 | out_unlock: | |
1495 | hci_dev_unlock(hdev); | |
1496 | return ret; | |
1497 | } | |
1498 | EXPORT_SYMBOL(l2cap_register_user); | |
1499 | ||
1500 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1501 | { | |
1502 | struct hci_dev *hdev = conn->hcon->hdev; | |
1503 | ||
1504 | hci_dev_lock(hdev); | |
1505 | ||
1506 | if (!user->list.next || !user->list.prev) | |
1507 | goto out_unlock; | |
1508 | ||
1509 | list_del(&user->list); | |
1510 | user->list.next = NULL; | |
1511 | user->list.prev = NULL; | |
1512 | user->remove(conn, user); | |
1513 | ||
1514 | out_unlock: | |
1515 | hci_dev_unlock(hdev); | |
1516 | } | |
1517 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1518 | ||
1519 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1520 | { | |
1521 | struct l2cap_user *user; | |
1522 | ||
1523 | while (!list_empty(&conn->users)) { | |
1524 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1525 | list_del(&user->list); | |
1526 | user->list.next = NULL; | |
1527 | user->list.prev = NULL; | |
1528 | user->remove(conn, user); | |
1529 | } | |
1530 | } | |
1531 | ||
5d3de7df VCG |
1532 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1533 | { | |
1534 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1535 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1536 | |
1537 | if (!conn) | |
1538 | return; | |
1539 | ||
1540 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1541 | ||
1542 | kfree_skb(conn->rx_skb); | |
1543 | ||
2c8e1411 DH |
1544 | l2cap_unregister_all_users(conn); |
1545 | ||
3df91ea2 AE |
1546 | mutex_lock(&conn->chan_lock); |
1547 | ||
5d3de7df VCG |
1548 | /* Kill channels */ |
1549 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1550 | l2cap_chan_hold(chan); |
6be36555 AE |
1551 | l2cap_chan_lock(chan); |
1552 | ||
5d3de7df | 1553 | l2cap_chan_del(chan, err); |
6be36555 AE |
1554 | |
1555 | l2cap_chan_unlock(chan); | |
1556 | ||
80b98027 | 1557 | chan->ops->close(chan); |
61d6ef3e | 1558 | l2cap_chan_put(chan); |
5d3de7df VCG |
1559 | } |
1560 | ||
3df91ea2 AE |
1561 | mutex_unlock(&conn->chan_lock); |
1562 | ||
73d80deb LAD |
1563 | hci_chan_del(conn->hchan); |
1564 | ||
5d3de7df | 1565 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1566 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1567 | |
51a8efd7 | 1568 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1569 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1570 | smp_chan_destroy(conn); |
d26a2345 | 1571 | } |
5d3de7df VCG |
1572 | |
1573 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1574 | conn->hchan = NULL; |
1575 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1576 | } |
1577 | ||
6c9d42a1 | 1578 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1579 | { |
6c9d42a1 | 1580 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1581 | security_timer.work); |
5d3de7df | 1582 | |
d06cc416 JH |
1583 | BT_DBG("conn %p", conn); |
1584 | ||
1585 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1586 | smp_chan_destroy(conn); | |
1587 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1588 | } | |
5d3de7df VCG |
1589 | } |
1590 | ||
baf43251 | 1591 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
1da177e4 | 1592 | { |
0139418c | 1593 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1594 | struct hci_chan *hchan; |
1da177e4 | 1595 | |
baf43251 | 1596 | if (conn) |
1da177e4 LT |
1597 | return conn; |
1598 | ||
73d80deb LAD |
1599 | hchan = hci_chan_create(hcon); |
1600 | if (!hchan) | |
1601 | return NULL; | |
1602 | ||
8bcde1f2 | 1603 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1604 | if (!conn) { |
1605 | hci_chan_del(hchan); | |
1da177e4 | 1606 | return NULL; |
73d80deb | 1607 | } |
1da177e4 | 1608 | |
9c903e37 | 1609 | kref_init(&conn->ref); |
1da177e4 LT |
1610 | hcon->l2cap_data = conn; |
1611 | conn->hcon = hcon; | |
9c903e37 | 1612 | hci_conn_get(conn->hcon); |
73d80deb | 1613 | conn->hchan = hchan; |
1da177e4 | 1614 | |
73d80deb | 1615 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1616 | |
dcc042d5 | 1617 | switch (hcon->type) { |
dcc042d5 AE |
1618 | case LE_LINK: |
1619 | if (hcon->hdev->le_mtu) { | |
1620 | conn->mtu = hcon->hdev->le_mtu; | |
1621 | break; | |
1622 | } | |
1623 | /* fall through */ | |
dcc042d5 | 1624 | default: |
acd7d370 | 1625 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1626 | break; |
1627 | } | |
acd7d370 | 1628 | |
1da177e4 LT |
1629 | conn->src = &hcon->hdev->bdaddr; |
1630 | conn->dst = &hcon->dst; | |
1631 | ||
4e8402a3 MH |
1632 | conn->feat_mask = 0; |
1633 | ||
1da177e4 | 1634 | spin_lock_init(&conn->lock); |
3df91ea2 | 1635 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1636 | |
1637 | INIT_LIST_HEAD(&conn->chan_l); | |
2c8e1411 | 1638 | INIT_LIST_HEAD(&conn->users); |
1da177e4 | 1639 | |
5d3de7df | 1640 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1641 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1642 | else |
030013d8 | 1643 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1644 | |
9f5a0d7b | 1645 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1646 | |
1da177e4 LT |
1647 | return conn; |
1648 | } | |
1649 | ||
9c903e37 DH |
1650 | static void l2cap_conn_free(struct kref *ref) |
1651 | { | |
1652 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1653 | ||
1654 | hci_conn_put(conn->hcon); | |
1655 | kfree(conn); | |
1656 | } | |
1657 | ||
1658 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1659 | { | |
1660 | kref_get(&conn->ref); | |
1661 | } | |
1662 | EXPORT_SYMBOL(l2cap_conn_get); | |
1663 | ||
1664 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1665 | { | |
1666 | kref_put(&conn->ref, l2cap_conn_free); | |
1667 | } | |
1668 | EXPORT_SYMBOL(l2cap_conn_put); | |
1669 | ||
1da177e4 | 1670 | /* ---- Socket interface ---- */ |
1da177e4 | 1671 | |
c2287681 | 1672 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1673 | * Returns closest match. |
1674 | */ | |
c2287681 IY |
1675 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1676 | bdaddr_t *src, | |
1677 | bdaddr_t *dst) | |
1da177e4 | 1678 | { |
23691d75 | 1679 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1680 | |
23691d75 | 1681 | read_lock(&chan_list_lock); |
e0f0cb56 | 1682 | |
23691d75 GP |
1683 | list_for_each_entry(c, &chan_list, global_l) { |
1684 | struct sock *sk = c->sk; | |
fe4128e0 | 1685 | |
89bc500e | 1686 | if (state && c->state != state) |
1da177e4 LT |
1687 | continue; |
1688 | ||
23691d75 | 1689 | if (c->psm == psm) { |
c2287681 IY |
1690 | int src_match, dst_match; |
1691 | int src_any, dst_any; | |
1692 | ||
1da177e4 | 1693 | /* Exact match. */ |
c2287681 IY |
1694 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1695 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1696 | if (src_match && dst_match) { | |
a7567b20 | 1697 | read_unlock(&chan_list_lock); |
23691d75 GP |
1698 | return c; |
1699 | } | |
1da177e4 LT |
1700 | |
1701 | /* Closest match */ | |
c2287681 IY |
1702 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1703 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1704 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1705 | (src_any && dst_any)) | |
23691d75 | 1706 | c1 = c; |
1da177e4 LT |
1707 | } |
1708 | } | |
1da177e4 | 1709 | |
23691d75 | 1710 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1711 | |
23691d75 | 1712 | return c1; |
1da177e4 LT |
1713 | } |
1714 | ||
8e9f9892 AG |
1715 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1716 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1717 | { |
5d41ce1d | 1718 | struct sock *sk = chan->sk; |
1da177e4 | 1719 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1720 | struct l2cap_conn *conn; |
1721 | struct hci_conn *hcon; | |
1722 | struct hci_dev *hdev; | |
09ab6f4c | 1723 | __u8 auth_type; |
44d0e48e | 1724 | int err; |
1da177e4 | 1725 | |
6ed93dc6 | 1726 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1727 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1728 | |
af05b30b GP |
1729 | hdev = hci_get_route(dst, src); |
1730 | if (!hdev) | |
1da177e4 LT |
1731 | return -EHOSTUNREACH; |
1732 | ||
09fd0de5 | 1733 | hci_dev_lock(hdev); |
1da177e4 | 1734 | |
6be36555 | 1735 | l2cap_chan_lock(chan); |
03a00194 GP |
1736 | |
1737 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1738 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1739 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1740 | err = -EINVAL; |
1741 | goto done; | |
1742 | } | |
1743 | ||
1744 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1745 | err = -EINVAL; | |
1746 | goto done; | |
1747 | } | |
1748 | ||
1749 | switch (chan->mode) { | |
1750 | case L2CAP_MODE_BASIC: | |
1751 | break; | |
1752 | case L2CAP_MODE_ERTM: | |
1753 | case L2CAP_MODE_STREAMING: | |
1754 | if (!disable_ertm) | |
1755 | break; | |
1756 | /* fall through */ | |
1757 | default: | |
1758 | err = -ENOTSUPP; | |
1759 | goto done; | |
1760 | } | |
1761 | ||
0797e01d | 1762 | switch (chan->state) { |
03a00194 GP |
1763 | case BT_CONNECT: |
1764 | case BT_CONNECT2: | |
1765 | case BT_CONFIG: | |
1766 | /* Already connecting */ | |
1767 | err = 0; | |
1768 | goto done; | |
1769 | ||
1770 | case BT_CONNECTED: | |
1771 | /* Already connected */ | |
1772 | err = -EISCONN; | |
1773 | goto done; | |
1774 | ||
1775 | case BT_OPEN: | |
1776 | case BT_BOUND: | |
1777 | /* Can connect */ | |
1778 | break; | |
1779 | ||
1780 | default: | |
1781 | err = -EBADFD; | |
1782 | goto done; | |
1783 | } | |
1784 | ||
1785 | /* Set destination address and psm */ | |
0797e01d | 1786 | lock_sock(sk); |
9219b2a0 | 1787 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1788 | release_sock(sk); |
1789 | ||
03a00194 GP |
1790 | chan->psm = psm; |
1791 | chan->dcid = cid; | |
1da177e4 | 1792 | |
4343478f | 1793 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1794 | |
fe4128e0 | 1795 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1796 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1797 | chan->sec_level, auth_type); |
acd7d370 | 1798 | else |
8e9f9892 | 1799 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1800 | chan->sec_level, auth_type); |
acd7d370 | 1801 | |
30e76272 VT |
1802 | if (IS_ERR(hcon)) { |
1803 | err = PTR_ERR(hcon); | |
1da177e4 | 1804 | goto done; |
30e76272 | 1805 | } |
1da177e4 | 1806 | |
baf43251 | 1807 | conn = l2cap_conn_add(hcon); |
1da177e4 | 1808 | if (!conn) { |
76a68ba0 | 1809 | hci_conn_drop(hcon); |
30e76272 | 1810 | err = -ENOMEM; |
1da177e4 LT |
1811 | goto done; |
1812 | } | |
1813 | ||
9f0caeb1 VCG |
1814 | if (hcon->type == LE_LINK) { |
1815 | err = 0; | |
1816 | ||
1817 | if (!list_empty(&conn->chan_l)) { | |
1818 | err = -EBUSY; | |
76a68ba0 | 1819 | hci_conn_drop(hcon); |
9f0caeb1 VCG |
1820 | } |
1821 | ||
1822 | if (err) | |
1823 | goto done; | |
1824 | } | |
1825 | ||
1da177e4 LT |
1826 | /* Update source addr of the socket */ |
1827 | bacpy(src, conn->src); | |
1828 | ||
6be36555 | 1829 | l2cap_chan_unlock(chan); |
48454079 | 1830 | l2cap_chan_add(conn, chan); |
6be36555 | 1831 | l2cap_chan_lock(chan); |
48454079 | 1832 | |
6be36555 | 1833 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1834 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1835 | |
1836 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1837 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1838 | __clear_chan_timer(chan); |
d45fc423 | 1839 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1840 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1841 | } else |
fc7f8a7e | 1842 | l2cap_do_start(chan); |
1da177e4 LT |
1843 | } |
1844 | ||
30e76272 VT |
1845 | err = 0; |
1846 | ||
1da177e4 | 1847 | done: |
6be36555 | 1848 | l2cap_chan_unlock(chan); |
09fd0de5 | 1849 | hci_dev_unlock(hdev); |
1da177e4 LT |
1850 | hci_dev_put(hdev); |
1851 | return err; | |
1852 | } | |
1853 | ||
dcba0dba | 1854 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1855 | { |
8c1d787b | 1856 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1857 | DECLARE_WAITQUEUE(wait, current); |
1858 | int err = 0; | |
1859 | int timeo = HZ/5; | |
1860 | ||
2b0b05dd | 1861 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1862 | set_current_state(TASK_INTERRUPTIBLE); |
1863 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1864 | if (!timeo) |
1865 | timeo = HZ/5; | |
1866 | ||
1867 | if (signal_pending(current)) { | |
1868 | err = sock_intr_errno(timeo); | |
1869 | break; | |
1870 | } | |
1871 | ||
1872 | release_sock(sk); | |
1873 | timeo = schedule_timeout(timeo); | |
1874 | lock_sock(sk); | |
a71a0cf4 | 1875 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1876 | |
1877 | err = sock_error(sk); | |
1878 | if (err) | |
1879 | break; | |
1880 | } | |
1881 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1882 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1883 | return err; |
1884 | } | |
1885 | ||
721c4181 | 1886 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1887 | { |
721c4181 | 1888 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1889 | monitor_timer.work); |
e90bac06 | 1890 | |
525cd185 | 1891 | BT_DBG("chan %p", chan); |
0e98958d | 1892 | |
6be36555 AE |
1893 | l2cap_chan_lock(chan); |
1894 | ||
80909e04 | 1895 | if (!chan->conn) { |
6be36555 | 1896 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1897 | l2cap_chan_put(chan); |
e90bac06 GP |
1898 | return; |
1899 | } | |
1900 | ||
401bb1f7 | 1901 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1902 | |
6be36555 | 1903 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1904 | l2cap_chan_put(chan); |
e90bac06 GP |
1905 | } |
1906 | ||
721c4181 | 1907 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1908 | { |
721c4181 | 1909 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1910 | retrans_timer.work); |
e90bac06 | 1911 | |
49208c9c | 1912 | BT_DBG("chan %p", chan); |
0e98958d | 1913 | |
6be36555 AE |
1914 | l2cap_chan_lock(chan); |
1915 | ||
80909e04 MM |
1916 | if (!chan->conn) { |
1917 | l2cap_chan_unlock(chan); | |
1918 | l2cap_chan_put(chan); | |
1919 | return; | |
1920 | } | |
6be36555 | 1921 | |
401bb1f7 | 1922 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1923 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1924 | l2cap_chan_put(chan); |
e90bac06 GP |
1925 | } |
1926 | ||
d660366d GP |
1927 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1928 | struct sk_buff_head *skbs) | |
6840ed07 | 1929 | { |
ccbb84af | 1930 | struct sk_buff *skb; |
3733937d | 1931 | struct l2cap_ctrl *control; |
6840ed07 | 1932 | |
3733937d MM |
1933 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1934 | ||
b99e13ad MM |
1935 | if (__chan_is_moving(chan)) |
1936 | return; | |
1937 | ||
3733937d MM |
1938 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1939 | ||
1940 | while (!skb_queue_empty(&chan->tx_q)) { | |
1941 | ||
1942 | skb = skb_dequeue(&chan->tx_q); | |
1943 | ||
1944 | bt_cb(skb)->control.retries = 1; | |
1945 | control = &bt_cb(skb)->control; | |
1946 | ||
1947 | control->reqseq = 0; | |
1948 | control->txseq = chan->next_tx_seq; | |
1949 | ||
1950 | __pack_control(chan, control, skb); | |
6840ed07 | 1951 | |
47d1ec61 | 1952 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1953 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1954 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1955 | } |
1956 | ||
4343478f | 1957 | l2cap_do_send(chan, skb); |
6840ed07 | 1958 | |
b4400672 | 1959 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1960 | |
836be934 | 1961 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1962 | chan->frames_sent++; |
6840ed07 | 1963 | } |
6840ed07 GP |
1964 | } |
1965 | ||
67c9e840 | 1966 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1967 | { |
1968 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1969 | struct l2cap_ctrl *control; |
1970 | int sent = 0; | |
1971 | ||
1972 | BT_DBG("chan %p", chan); | |
1c2acffb | 1973 | |
89bc500e | 1974 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1975 | return -ENOTCONN; |
e90bac06 | 1976 | |
94122bbe MM |
1977 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1978 | return 0; | |
1979 | ||
b99e13ad MM |
1980 | if (__chan_is_moving(chan)) |
1981 | return 0; | |
1982 | ||
18a48e76 MM |
1983 | while (chan->tx_send_head && |
1984 | chan->unacked_frames < chan->remote_tx_win && | |
1985 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1986 | |
18a48e76 | 1987 | skb = chan->tx_send_head; |
e90bac06 | 1988 | |
18a48e76 MM |
1989 | bt_cb(skb)->control.retries = 1; |
1990 | control = &bt_cb(skb)->control; | |
95ffa978 | 1991 | |
e2ab4353 | 1992 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1993 | control->final = 1; |
e2ab4353 | 1994 | |
18a48e76 MM |
1995 | control->reqseq = chan->buffer_seq; |
1996 | chan->last_acked_seq = chan->buffer_seq; | |
1997 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1998 | |
18a48e76 | 1999 | __pack_control(chan, control, skb); |
e90bac06 | 2000 | |
47d1ec61 | 2001 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
2002 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
2003 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
2004 | } |
2005 | ||
18a48e76 MM |
2006 | /* Clone after data has been modified. Data is assumed to be |
2007 | read-only (for locking purposes) on cloned sk_buffs. | |
2008 | */ | |
2009 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 2010 | |
18a48e76 MM |
2011 | if (!tx_skb) |
2012 | break; | |
1c2acffb | 2013 | |
18a48e76 | 2014 | __set_retrans_timer(chan); |
836be934 AE |
2015 | |
2016 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 2017 | chan->unacked_frames++; |
6a026610 | 2018 | chan->frames_sent++; |
18a48e76 | 2019 | sent++; |
1c2acffb | 2020 | |
58d35f87 GP |
2021 | if (skb_queue_is_last(&chan->tx_q, skb)) |
2022 | chan->tx_send_head = NULL; | |
1c2acffb | 2023 | else |
58d35f87 | 2024 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
2025 | |
2026 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 2027 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
2028 | } |
2029 | ||
b4400672 AE |
2030 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
2031 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
2032 | |
2033 | return sent; | |
9e917af1 GP |
2034 | } |
2035 | ||
e1fbd4c1 MM |
2036 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
2037 | { | |
2038 | struct l2cap_ctrl control; | |
2039 | struct sk_buff *skb; | |
2040 | struct sk_buff *tx_skb; | |
2041 | u16 seq; | |
2042 | ||
2043 | BT_DBG("chan %p", chan); | |
2044 | ||
2045 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2046 | return; | |
2047 | ||
b99e13ad MM |
2048 | if (__chan_is_moving(chan)) |
2049 | return; | |
2050 | ||
e1fbd4c1 MM |
2051 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
2052 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
2053 | ||
2054 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
2055 | if (!skb) { | |
2056 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 2057 | seq); |
e1fbd4c1 MM |
2058 | continue; |
2059 | } | |
2060 | ||
2061 | bt_cb(skb)->control.retries++; | |
2062 | control = bt_cb(skb)->control; | |
2063 | ||
2064 | if (chan->max_tx != 0 && | |
2065 | bt_cb(skb)->control.retries > chan->max_tx) { | |
2066 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 2067 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
2068 | l2cap_seq_list_clear(&chan->retrans_list); |
2069 | break; | |
2070 | } | |
2071 | ||
2072 | control.reqseq = chan->buffer_seq; | |
2073 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
2074 | control.final = 1; | |
2075 | else | |
2076 | control.final = 0; | |
2077 | ||
2078 | if (skb_cloned(skb)) { | |
2079 | /* Cloned sk_buffs are read-only, so we need a | |
2080 | * writeable copy | |
2081 | */ | |
8bcde1f2 | 2082 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 2083 | } else { |
8bcde1f2 | 2084 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
2085 | } |
2086 | ||
2087 | if (!tx_skb) { | |
2088 | l2cap_seq_list_clear(&chan->retrans_list); | |
2089 | break; | |
2090 | } | |
2091 | ||
2092 | /* Update skb contents */ | |
2093 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
2094 | put_unaligned_le32(__pack_extended_control(&control), | |
2095 | tx_skb->data + L2CAP_HDR_SIZE); | |
2096 | } else { | |
2097 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2098 | tx_skb->data + L2CAP_HDR_SIZE); | |
2099 | } | |
2100 | ||
2101 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
2102 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
2103 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
2104 | L2CAP_FCS_SIZE)); | |
2105 | } | |
2106 | ||
2107 | l2cap_do_send(chan, tx_skb); | |
2108 | ||
2109 | BT_DBG("Resent txseq %d", control.txseq); | |
2110 | ||
2111 | chan->last_acked_seq = chan->buffer_seq; | |
2112 | } | |
2113 | } | |
2114 | ||
f80842a8 MM |
2115 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2116 | struct l2cap_ctrl *control) | |
2117 | { | |
2118 | BT_DBG("chan %p, control %p", chan, control); | |
2119 | ||
2120 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2121 | l2cap_ertm_resend(chan); | |
2122 | } | |
2123 | ||
d2a7ac5d MM |
2124 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2125 | struct l2cap_ctrl *control) | |
2126 | { | |
e1fbd4c1 MM |
2127 | struct sk_buff *skb; |
2128 | ||
2129 | BT_DBG("chan %p, control %p", chan, control); | |
2130 | ||
2131 | if (control->poll) | |
2132 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2133 | ||
2134 | l2cap_seq_list_clear(&chan->retrans_list); | |
2135 | ||
2136 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2137 | return; | |
2138 | ||
2139 | if (chan->unacked_frames) { | |
2140 | skb_queue_walk(&chan->tx_q, skb) { | |
2141 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2142 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2143 | break; |
2144 | } | |
2145 | ||
2146 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2147 | if (skb == chan->tx_send_head) | |
2148 | break; | |
2149 | ||
2150 | l2cap_seq_list_append(&chan->retrans_list, | |
2151 | bt_cb(skb)->control.txseq); | |
2152 | } | |
2153 | ||
2154 | l2cap_ertm_resend(chan); | |
2155 | } | |
d2a7ac5d MM |
2156 | } |
2157 | ||
0a0aba42 | 2158 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2159 | { |
0a0aba42 MM |
2160 | struct l2cap_ctrl control; |
2161 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2162 | chan->last_acked_seq); | |
2163 | int threshold; | |
9e917af1 | 2164 | |
0a0aba42 MM |
2165 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2166 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2167 | |
0a0aba42 MM |
2168 | memset(&control, 0, sizeof(control)); |
2169 | control.sframe = 1; | |
dfc909be | 2170 | |
0a0aba42 MM |
2171 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2172 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2173 | __clear_ack_timer(chan); | |
2174 | control.super = L2CAP_SUPER_RNR; | |
2175 | control.reqseq = chan->buffer_seq; | |
2176 | l2cap_send_sframe(chan, &control); | |
2177 | } else { | |
2178 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2179 | l2cap_ertm_send(chan); | |
2180 | /* If any i-frames were sent, they included an ack */ | |
2181 | if (chan->buffer_seq == chan->last_acked_seq) | |
2182 | frames_to_ack = 0; | |
2183 | } | |
dfc909be | 2184 | |
c20f8e35 | 2185 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2186 | * Calculate without mul or div |
2187 | */ | |
c20f8e35 | 2188 | threshold = chan->ack_win; |
0a0aba42 MM |
2189 | threshold += threshold << 1; |
2190 | threshold >>= 2; | |
2191 | ||
b4400672 | 2192 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2193 | threshold); |
2194 | ||
2195 | if (frames_to_ack >= threshold) { | |
2196 | __clear_ack_timer(chan); | |
2197 | control.super = L2CAP_SUPER_RR; | |
2198 | control.reqseq = chan->buffer_seq; | |
2199 | l2cap_send_sframe(chan, &control); | |
2200 | frames_to_ack = 0; | |
2201 | } | |
1c2acffb | 2202 | |
0a0aba42 MM |
2203 | if (frames_to_ack) |
2204 | __set_ack_timer(chan); | |
2205 | } | |
b17e73bb SJ |
2206 | } |
2207 | ||
04124681 GP |
2208 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2209 | struct msghdr *msg, int len, | |
2210 | int count, struct sk_buff *skb) | |
1c2acffb | 2211 | { |
0952a57a | 2212 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2213 | struct sk_buff **frag; |
90338947 | 2214 | int sent = 0; |
1da177e4 | 2215 | |
59203a21 | 2216 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 2217 | return -EFAULT; |
1da177e4 LT |
2218 | |
2219 | sent += count; | |
2220 | len -= count; | |
2221 | ||
2222 | /* Continuation fragments (no L2CAP header) */ | |
2223 | frag = &skb_shinfo(skb)->frag_list; | |
2224 | while (len) { | |
fbe00700 GP |
2225 | struct sk_buff *tmp; |
2226 | ||
1da177e4 LT |
2227 | count = min_t(unsigned int, conn->mtu, len); |
2228 | ||
fbe00700 GP |
2229 | tmp = chan->ops->alloc_skb(chan, count, |
2230 | msg->msg_flags & MSG_DONTWAIT); | |
2231 | if (IS_ERR(tmp)) | |
2232 | return PTR_ERR(tmp); | |
2233 | ||
2234 | *frag = tmp; | |
2f7719ce | 2235 | |
1c2acffb GP |
2236 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
2237 | return -EFAULT; | |
1da177e4 | 2238 | |
5e59b791 LAD |
2239 | (*frag)->priority = skb->priority; |
2240 | ||
1da177e4 LT |
2241 | sent += count; |
2242 | len -= count; | |
2243 | ||
2d0ed3d5 GP |
2244 | skb->len += (*frag)->len; |
2245 | skb->data_len += (*frag)->len; | |
2246 | ||
1da177e4 LT |
2247 | frag = &(*frag)->next; |
2248 | } | |
1da177e4 LT |
2249 | |
2250 | return sent; | |
1c2acffb | 2251 | } |
1da177e4 | 2252 | |
5e59b791 | 2253 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2254 | struct msghdr *msg, size_t len, |
2255 | u32 priority) | |
1c2acffb | 2256 | { |
8c1d787b | 2257 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2258 | struct sk_buff *skb; |
03a51213 | 2259 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2260 | struct l2cap_hdr *lh; |
2261 | ||
b4400672 | 2262 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2263 | |
2264 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2265 | |
2266 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2267 | msg->msg_flags & MSG_DONTWAIT); |
2268 | if (IS_ERR(skb)) | |
2269 | return skb; | |
1c2acffb | 2270 | |
5e59b791 LAD |
2271 | skb->priority = priority; |
2272 | ||
1c2acffb GP |
2273 | /* Create L2CAP header */ |
2274 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2275 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2276 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2277 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2278 | |
0952a57a | 2279 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2280 | if (unlikely(err < 0)) { |
2281 | kfree_skb(skb); | |
2282 | return ERR_PTR(err); | |
2283 | } | |
2284 | return skb; | |
2285 | } | |
2286 | ||
5e59b791 | 2287 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2288 | struct msghdr *msg, size_t len, |
2289 | u32 priority) | |
1c2acffb | 2290 | { |
8c1d787b | 2291 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2292 | struct sk_buff *skb; |
f2ba7fae | 2293 | int err, count; |
1c2acffb GP |
2294 | struct l2cap_hdr *lh; |
2295 | ||
b4400672 | 2296 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2297 | |
f2ba7fae | 2298 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2299 | |
f2ba7fae | 2300 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2301 | msg->msg_flags & MSG_DONTWAIT); |
2302 | if (IS_ERR(skb)) | |
2303 | return skb; | |
1c2acffb | 2304 | |
5e59b791 LAD |
2305 | skb->priority = priority; |
2306 | ||
1c2acffb GP |
2307 | /* Create L2CAP header */ |
2308 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2309 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2310 | lh->len = cpu_to_le16(len); |
1c2acffb | 2311 | |
0952a57a | 2312 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2313 | if (unlikely(err < 0)) { |
2314 | kfree_skb(skb); | |
2315 | return ERR_PTR(err); | |
2316 | } | |
2317 | return skb; | |
2318 | } | |
2319 | ||
ab0ff76d | 2320 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2321 | struct msghdr *msg, size_t len, |
2322 | u16 sdulen) | |
1c2acffb | 2323 | { |
8c1d787b | 2324 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2325 | struct sk_buff *skb; |
e4ca6d98 | 2326 | int err, count, hlen; |
1c2acffb GP |
2327 | struct l2cap_hdr *lh; |
2328 | ||
b4400672 | 2329 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2330 | |
0ee0d208 GP |
2331 | if (!conn) |
2332 | return ERR_PTR(-ENOTCONN); | |
2333 | ||
ba7aa64f | 2334 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2335 | |
c74e560c | 2336 | if (sdulen) |
03a51213 | 2337 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2338 | |
47d1ec61 | 2339 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2340 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2341 | |
1c2acffb | 2342 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2343 | |
2344 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2345 | msg->msg_flags & MSG_DONTWAIT); |
2346 | if (IS_ERR(skb)) | |
2347 | return skb; | |
1c2acffb GP |
2348 | |
2349 | /* Create L2CAP header */ | |
2350 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2351 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2352 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2353 | |
18a48e76 MM |
2354 | /* Control header is populated later */ |
2355 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2356 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2357 | else | |
2358 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2359 | |
c74e560c | 2360 | if (sdulen) |
03a51213 | 2361 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2362 | |
0952a57a | 2363 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2364 | if (unlikely(err < 0)) { |
2365 | kfree_skb(skb); | |
2366 | return ERR_PTR(err); | |
2367 | } | |
e90bac06 | 2368 | |
18a48e76 | 2369 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2370 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2371 | return skb; |
1da177e4 LT |
2372 | } |
2373 | ||
94122bbe MM |
2374 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2375 | struct sk_buff_head *seg_queue, | |
2376 | struct msghdr *msg, size_t len) | |
c74e560c | 2377 | { |
c74e560c | 2378 | struct sk_buff *skb; |
94122bbe MM |
2379 | u16 sdu_len; |
2380 | size_t pdu_len; | |
94122bbe | 2381 | u8 sar; |
c74e560c | 2382 | |
b4400672 | 2383 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2384 | |
94122bbe MM |
2385 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2386 | * so fragmented skbs are not used. The HCI layer's handling | |
2387 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2388 | */ | |
c74e560c | 2389 | |
94122bbe MM |
2390 | /* PDU size is derived from the HCI MTU */ |
2391 | pdu_len = chan->conn->mtu; | |
c74e560c | 2392 | |
a549574d MM |
2393 | /* Constrain PDU size for BR/EDR connections */ |
2394 | if (!chan->hs_hcon) | |
2395 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2396 | |
2397 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2398 | if (chan->fcs) |
2399 | pdu_len -= L2CAP_FCS_SIZE; | |
2400 | ||
ba7aa64f | 2401 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2402 | |
2403 | /* Remote device may have requested smaller PDUs */ | |
2404 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2405 | ||
2406 | if (len <= pdu_len) { | |
2407 | sar = L2CAP_SAR_UNSEGMENTED; | |
2408 | sdu_len = 0; | |
2409 | pdu_len = len; | |
2410 | } else { | |
2411 | sar = L2CAP_SAR_START; | |
2412 | sdu_len = len; | |
2413 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2414 | } | |
2415 | ||
2416 | while (len > 0) { | |
2417 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2418 | |
c74e560c | 2419 | if (IS_ERR(skb)) { |
94122bbe | 2420 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2421 | return PTR_ERR(skb); |
2422 | } | |
2423 | ||
94122bbe MM |
2424 | bt_cb(skb)->control.sar = sar; |
2425 | __skb_queue_tail(seg_queue, skb); | |
2426 | ||
2427 | len -= pdu_len; | |
2428 | if (sdu_len) { | |
2429 | sdu_len = 0; | |
2430 | pdu_len += L2CAP_SDULEN_SIZE; | |
2431 | } | |
2432 | ||
2433 | if (len <= pdu_len) { | |
2434 | sar = L2CAP_SAR_END; | |
2435 | pdu_len = len; | |
2436 | } else { | |
2437 | sar = L2CAP_SAR_CONTINUE; | |
2438 | } | |
c74e560c | 2439 | } |
c74e560c | 2440 | |
f0f62799 | 2441 | return 0; |
c74e560c GP |
2442 | } |
2443 | ||
5e59b791 | 2444 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2445 | u32 priority) |
9a91a04a | 2446 | { |
9a91a04a | 2447 | struct sk_buff *skb; |
9a91a04a | 2448 | int err; |
94122bbe | 2449 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2450 | |
2451 | /* Connectionless channel */ | |
715ec005 | 2452 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2453 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2454 | if (IS_ERR(skb)) |
2455 | return PTR_ERR(skb); | |
2456 | ||
2457 | l2cap_do_send(chan, skb); | |
2458 | return len; | |
2459 | } | |
2460 | ||
2461 | switch (chan->mode) { | |
2462 | case L2CAP_MODE_BASIC: | |
2463 | /* Check outgoing MTU */ | |
2464 | if (len > chan->omtu) | |
2465 | return -EMSGSIZE; | |
2466 | ||
2467 | /* Create a basic PDU */ | |
5e59b791 | 2468 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2469 | if (IS_ERR(skb)) |
2470 | return PTR_ERR(skb); | |
2471 | ||
2472 | l2cap_do_send(chan, skb); | |
2473 | err = len; | |
2474 | break; | |
2475 | ||
2476 | case L2CAP_MODE_ERTM: | |
2477 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2478 | /* Check outgoing MTU */ |
2479 | if (len > chan->omtu) { | |
2480 | err = -EMSGSIZE; | |
2481 | break; | |
2482 | } | |
9a91a04a | 2483 | |
94122bbe | 2484 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2485 | |
94122bbe MM |
2486 | /* Do segmentation before calling in to the state machine, |
2487 | * since it's possible to block while waiting for memory | |
2488 | * allocation. | |
2489 | */ | |
2490 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2491 | |
94122bbe MM |
2492 | /* The channel could have been closed while segmenting, |
2493 | * check that it is still connected. | |
2494 | */ | |
2495 | if (chan->state != BT_CONNECTED) { | |
2496 | __skb_queue_purge(&seg_queue); | |
2497 | err = -ENOTCONN; | |
9a91a04a GP |
2498 | } |
2499 | ||
94122bbe | 2500 | if (err) |
9a91a04a | 2501 | break; |
9a91a04a | 2502 | |
3733937d | 2503 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2504 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2505 | else |
d660366d | 2506 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2507 | |
d660366d | 2508 | err = len; |
9a91a04a | 2509 | |
94122bbe MM |
2510 | /* If the skbs were not queued for sending, they'll still be in |
2511 | * seg_queue and need to be purged. | |
2512 | */ | |
2513 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2514 | break; |
2515 | ||
2516 | default: | |
2517 | BT_DBG("bad state %1.1x", chan->mode); | |
2518 | err = -EBADFD; | |
2519 | } | |
2520 | ||
2521 | return err; | |
2522 | } | |
2523 | ||
d2a7ac5d MM |
2524 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2525 | { | |
bed68bde MM |
2526 | struct l2cap_ctrl control; |
2527 | u16 seq; | |
2528 | ||
b4400672 | 2529 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2530 | |
2531 | memset(&control, 0, sizeof(control)); | |
2532 | control.sframe = 1; | |
2533 | control.super = L2CAP_SUPER_SREJ; | |
2534 | ||
2535 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2536 | seq = __next_seq(chan, seq)) { | |
2537 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2538 | control.reqseq = seq; | |
2539 | l2cap_send_sframe(chan, &control); | |
2540 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2541 | } | |
2542 | } | |
2543 | ||
2544 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2545 | } |
2546 | ||
2547 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2548 | { | |
bed68bde MM |
2549 | struct l2cap_ctrl control; |
2550 | ||
2551 | BT_DBG("chan %p", chan); | |
2552 | ||
2553 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2554 | return; | |
2555 | ||
2556 | memset(&control, 0, sizeof(control)); | |
2557 | control.sframe = 1; | |
2558 | control.super = L2CAP_SUPER_SREJ; | |
2559 | control.reqseq = chan->srej_list.tail; | |
2560 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2561 | } |
2562 | ||
2563 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2564 | { | |
bed68bde MM |
2565 | struct l2cap_ctrl control; |
2566 | u16 initial_head; | |
2567 | u16 seq; | |
2568 | ||
b4400672 | 2569 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2570 | |
2571 | memset(&control, 0, sizeof(control)); | |
2572 | control.sframe = 1; | |
2573 | control.super = L2CAP_SUPER_SREJ; | |
2574 | ||
2575 | /* Capture initial list head to allow only one pass through the list. */ | |
2576 | initial_head = chan->srej_list.head; | |
2577 | ||
2578 | do { | |
2579 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2580 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2581 | break; | |
2582 | ||
2583 | control.reqseq = seq; | |
2584 | l2cap_send_sframe(chan, &control); | |
2585 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2586 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2587 | } |
2588 | ||
608bcc6d MM |
2589 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2590 | { | |
2591 | struct sk_buff *acked_skb; | |
2592 | u16 ackseq; | |
2593 | ||
b4400672 | 2594 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2595 | |
2596 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2597 | return; | |
2598 | ||
b4400672 | 2599 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2600 | chan->expected_ack_seq, chan->unacked_frames); |
2601 | ||
2602 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2603 | ackseq = __next_seq(chan, ackseq)) { | |
2604 | ||
2605 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2606 | if (acked_skb) { | |
2607 | skb_unlink(acked_skb, &chan->tx_q); | |
2608 | kfree_skb(acked_skb); | |
2609 | chan->unacked_frames--; | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | chan->expected_ack_seq = reqseq; | |
2614 | ||
2615 | if (chan->unacked_frames == 0) | |
2616 | __clear_retrans_timer(chan); | |
2617 | ||
b4400672 | 2618 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2619 | } |
2620 | ||
2621 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2622 | { | |
2623 | BT_DBG("chan %p", chan); | |
2624 | ||
2625 | chan->expected_tx_seq = chan->buffer_seq; | |
2626 | l2cap_seq_list_clear(&chan->srej_list); | |
2627 | skb_queue_purge(&chan->srej_q); | |
2628 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2629 | } | |
2630 | ||
d660366d GP |
2631 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2632 | struct l2cap_ctrl *control, | |
2633 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2634 | { |
608bcc6d MM |
2635 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2636 | event); | |
2637 | ||
2638 | switch (event) { | |
2639 | case L2CAP_EV_DATA_REQUEST: | |
2640 | if (chan->tx_send_head == NULL) | |
2641 | chan->tx_send_head = skb_peek(skbs); | |
2642 | ||
2643 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2644 | l2cap_ertm_send(chan); | |
2645 | break; | |
2646 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2647 | BT_DBG("Enter LOCAL_BUSY"); | |
2648 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2649 | ||
2650 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2651 | /* The SREJ_SENT state must be aborted if we are to | |
2652 | * enter the LOCAL_BUSY state. | |
2653 | */ | |
2654 | l2cap_abort_rx_srej_sent(chan); | |
2655 | } | |
2656 | ||
2657 | l2cap_send_ack(chan); | |
2658 | ||
2659 | break; | |
2660 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2661 | BT_DBG("Exit LOCAL_BUSY"); | |
2662 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2663 | ||
2664 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2665 | struct l2cap_ctrl local_control; | |
2666 | ||
2667 | memset(&local_control, 0, sizeof(local_control)); | |
2668 | local_control.sframe = 1; | |
2669 | local_control.super = L2CAP_SUPER_RR; | |
2670 | local_control.poll = 1; | |
2671 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2672 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2673 | |
2674 | chan->retry_count = 1; | |
2675 | __set_monitor_timer(chan); | |
2676 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2677 | } | |
2678 | break; | |
2679 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2680 | l2cap_process_reqseq(chan, control->reqseq); | |
2681 | break; | |
2682 | case L2CAP_EV_EXPLICIT_POLL: | |
2683 | l2cap_send_rr_or_rnr(chan, 1); | |
2684 | chan->retry_count = 1; | |
2685 | __set_monitor_timer(chan); | |
2686 | __clear_ack_timer(chan); | |
2687 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2688 | break; | |
2689 | case L2CAP_EV_RETRANS_TO: | |
2690 | l2cap_send_rr_or_rnr(chan, 1); | |
2691 | chan->retry_count = 1; | |
2692 | __set_monitor_timer(chan); | |
2693 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2694 | break; | |
2695 | case L2CAP_EV_RECV_FBIT: | |
2696 | /* Nothing to process */ | |
2697 | break; | |
2698 | default: | |
2699 | break; | |
2700 | } | |
608bcc6d MM |
2701 | } |
2702 | ||
d660366d GP |
2703 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2704 | struct l2cap_ctrl *control, | |
2705 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2706 | { |
608bcc6d MM |
2707 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2708 | event); | |
2709 | ||
2710 | switch (event) { | |
2711 | case L2CAP_EV_DATA_REQUEST: | |
2712 | if (chan->tx_send_head == NULL) | |
2713 | chan->tx_send_head = skb_peek(skbs); | |
2714 | /* Queue data, but don't send. */ | |
2715 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2716 | break; | |
2717 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2718 | BT_DBG("Enter LOCAL_BUSY"); | |
2719 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2720 | ||
2721 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2722 | /* The SREJ_SENT state must be aborted if we are to | |
2723 | * enter the LOCAL_BUSY state. | |
2724 | */ | |
2725 | l2cap_abort_rx_srej_sent(chan); | |
2726 | } | |
2727 | ||
2728 | l2cap_send_ack(chan); | |
2729 | ||
2730 | break; | |
2731 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2732 | BT_DBG("Exit LOCAL_BUSY"); | |
2733 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2734 | ||
2735 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2736 | struct l2cap_ctrl local_control; | |
2737 | memset(&local_control, 0, sizeof(local_control)); | |
2738 | local_control.sframe = 1; | |
2739 | local_control.super = L2CAP_SUPER_RR; | |
2740 | local_control.poll = 1; | |
2741 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2742 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2743 | |
2744 | chan->retry_count = 1; | |
2745 | __set_monitor_timer(chan); | |
2746 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2747 | } | |
2748 | break; | |
2749 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2750 | l2cap_process_reqseq(chan, control->reqseq); | |
2751 | ||
2752 | /* Fall through */ | |
2753 | ||
2754 | case L2CAP_EV_RECV_FBIT: | |
2755 | if (control && control->final) { | |
2756 | __clear_monitor_timer(chan); | |
2757 | if (chan->unacked_frames > 0) | |
2758 | __set_retrans_timer(chan); | |
2759 | chan->retry_count = 0; | |
2760 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2761 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2762 | } | |
2763 | break; | |
2764 | case L2CAP_EV_EXPLICIT_POLL: | |
2765 | /* Ignore */ | |
2766 | break; | |
2767 | case L2CAP_EV_MONITOR_TO: | |
2768 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2769 | l2cap_send_rr_or_rnr(chan, 1); | |
2770 | __set_monitor_timer(chan); | |
2771 | chan->retry_count++; | |
2772 | } else { | |
5e4e3972 | 2773 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2774 | } |
2775 | break; | |
2776 | default: | |
2777 | break; | |
2778 | } | |
608bcc6d MM |
2779 | } |
2780 | ||
d660366d GP |
2781 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2782 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2783 | { |
608bcc6d MM |
2784 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2785 | chan, control, skbs, event, chan->tx_state); | |
2786 | ||
2787 | switch (chan->tx_state) { | |
2788 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2789 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2790 | break; |
2791 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2792 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2793 | break; |
2794 | default: | |
2795 | /* Ignore event */ | |
2796 | break; | |
2797 | } | |
608bcc6d MM |
2798 | } |
2799 | ||
4b51dae9 MM |
2800 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2801 | struct l2cap_ctrl *control) | |
2802 | { | |
2803 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2804 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2805 | } |
2806 | ||
f80842a8 MM |
2807 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2808 | struct l2cap_ctrl *control) | |
2809 | { | |
2810 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2811 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2812 | } |
2813 | ||
1da177e4 LT |
2814 | /* Copy frame to all raw sockets on that connection */ |
2815 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2816 | { | |
1da177e4 | 2817 | struct sk_buff *nskb; |
48454079 | 2818 | struct l2cap_chan *chan; |
1da177e4 LT |
2819 | |
2820 | BT_DBG("conn %p", conn); | |
2821 | ||
3df91ea2 | 2822 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2823 | |
3df91ea2 | 2824 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2825 | struct sock *sk = chan->sk; |
715ec005 | 2826 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2827 | continue; |
2828 | ||
2829 | /* Don't send frame to the socket it came from */ | |
2830 | if (skb->sk == sk) | |
2831 | continue; | |
8bcde1f2 | 2832 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2833 | if (!nskb) |
1da177e4 LT |
2834 | continue; |
2835 | ||
80b98027 | 2836 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2837 | kfree_skb(nskb); |
2838 | } | |
3d57dc68 | 2839 | |
3df91ea2 | 2840 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2841 | } |
2842 | ||
2843 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2844 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2845 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2846 | { |
2847 | struct sk_buff *skb, **frag; | |
2848 | struct l2cap_cmd_hdr *cmd; | |
2849 | struct l2cap_hdr *lh; | |
2850 | int len, count; | |
2851 | ||
b4400672 AE |
2852 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2853 | conn, code, ident, dlen); | |
1da177e4 | 2854 | |
300b962e AL |
2855 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2856 | return NULL; | |
2857 | ||
1da177e4 LT |
2858 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2859 | count = min_t(unsigned int, conn->mtu, len); | |
2860 | ||
8bcde1f2 | 2861 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2862 | if (!skb) |
2863 | return NULL; | |
2864 | ||
2865 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2866 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2867 | |
2868 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2869 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2870 | else |
ac73498c | 2871 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2872 | |
2873 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2874 | cmd->code = code; | |
2875 | cmd->ident = ident; | |
aca3192c | 2876 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2877 | |
2878 | if (dlen) { | |
2879 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2880 | memcpy(skb_put(skb, count), data, count); | |
2881 | data += count; | |
2882 | } | |
2883 | ||
2884 | len -= skb->len; | |
2885 | ||
2886 | /* Continuation fragments (no L2CAP header) */ | |
2887 | frag = &skb_shinfo(skb)->frag_list; | |
2888 | while (len) { | |
2889 | count = min_t(unsigned int, conn->mtu, len); | |
2890 | ||
8bcde1f2 | 2891 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2892 | if (!*frag) |
2893 | goto fail; | |
2894 | ||
2895 | memcpy(skb_put(*frag, count), data, count); | |
2896 | ||
2897 | len -= count; | |
2898 | data += count; | |
2899 | ||
2900 | frag = &(*frag)->next; | |
2901 | } | |
2902 | ||
2903 | return skb; | |
2904 | ||
2905 | fail: | |
2906 | kfree_skb(skb); | |
2907 | return NULL; | |
2908 | } | |
2909 | ||
2d792818 GP |
2910 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2911 | unsigned long *val) | |
1da177e4 LT |
2912 | { |
2913 | struct l2cap_conf_opt *opt = *ptr; | |
2914 | int len; | |
2915 | ||
2916 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2917 | *ptr += len; | |
2918 | ||
2919 | *type = opt->type; | |
2920 | *olen = opt->len; | |
2921 | ||
2922 | switch (opt->len) { | |
2923 | case 1: | |
2924 | *val = *((u8 *) opt->val); | |
2925 | break; | |
2926 | ||
2927 | case 2: | |
bfaaeb3e | 2928 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2929 | break; |
2930 | ||
2931 | case 4: | |
bfaaeb3e | 2932 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2933 | break; |
2934 | ||
2935 | default: | |
2936 | *val = (unsigned long) opt->val; | |
2937 | break; | |
2938 | } | |
2939 | ||
b4400672 | 2940 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2941 | return len; |
2942 | } | |
2943 | ||
1da177e4 LT |
2944 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2945 | { | |
2946 | struct l2cap_conf_opt *opt = *ptr; | |
2947 | ||
b4400672 | 2948 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2949 | |
2950 | opt->type = type; | |
2951 | opt->len = len; | |
2952 | ||
2953 | switch (len) { | |
2954 | case 1: | |
2955 | *((u8 *) opt->val) = val; | |
2956 | break; | |
2957 | ||
2958 | case 2: | |
4f8b691c | 2959 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2960 | break; |
2961 | ||
2962 | case 4: | |
4f8b691c | 2963 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2964 | break; |
2965 | ||
2966 | default: | |
2967 | memcpy(opt->val, (void *) val, len); | |
2968 | break; | |
2969 | } | |
2970 | ||
2971 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2972 | } | |
2973 | ||
f89cef09 AE |
2974 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2975 | { | |
2976 | struct l2cap_conf_efs efs; | |
2977 | ||
1ec918ce | 2978 | switch (chan->mode) { |
f89cef09 AE |
2979 | case L2CAP_MODE_ERTM: |
2980 | efs.id = chan->local_id; | |
2981 | efs.stype = chan->local_stype; | |
2982 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2983 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2984 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2985 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2986 | break; |
2987 | ||
2988 | case L2CAP_MODE_STREAMING: | |
2989 | efs.id = 1; | |
2990 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2991 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2992 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2993 | efs.acc_lat = 0; | |
2994 | efs.flush_to = 0; | |
2995 | break; | |
2996 | ||
2997 | default: | |
2998 | return; | |
2999 | } | |
3000 | ||
3001 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3002 | (unsigned long) &efs); |
f89cef09 AE |
3003 | } |
3004 | ||
721c4181 | 3005 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3006 | { |
721c4181 | 3007 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3008 | ack_timer.work); |
3009 | u16 frames_to_ack; | |
c1b4f43b | 3010 | |
2fb9b3d4 GP |
3011 | BT_DBG("chan %p", chan); |
3012 | ||
6be36555 AE |
3013 | l2cap_chan_lock(chan); |
3014 | ||
0362520b MM |
3015 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3016 | chan->last_acked_seq); | |
6be36555 | 3017 | |
0362520b MM |
3018 | if (frames_to_ack) |
3019 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3020 | |
0362520b | 3021 | l2cap_chan_unlock(chan); |
09bfb2ee | 3022 | l2cap_chan_put(chan); |
c1b4f43b GP |
3023 | } |
3024 | ||
466f8004 | 3025 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3026 | { |
3c588192 MM |
3027 | int err; |
3028 | ||
105bdf9e MM |
3029 | chan->next_tx_seq = 0; |
3030 | chan->expected_tx_seq = 0; | |
42e5c802 | 3031 | chan->expected_ack_seq = 0; |
6a026610 | 3032 | chan->unacked_frames = 0; |
42e5c802 | 3033 | chan->buffer_seq = 0; |
6a026610 | 3034 | chan->frames_sent = 0; |
105bdf9e MM |
3035 | chan->last_acked_seq = 0; |
3036 | chan->sdu = NULL; | |
3037 | chan->sdu_last_frag = NULL; | |
3038 | chan->sdu_len = 0; | |
3039 | ||
d34c34fb MM |
3040 | skb_queue_head_init(&chan->tx_q); |
3041 | ||
08333283 MM |
3042 | chan->local_amp_id = 0; |
3043 | chan->move_id = 0; | |
3044 | chan->move_state = L2CAP_MOVE_STABLE; | |
3045 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3046 | ||
105bdf9e MM |
3047 | if (chan->mode != L2CAP_MODE_ERTM) |
3048 | return 0; | |
3049 | ||
3050 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3051 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3052 | |
721c4181 GP |
3053 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3054 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3055 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3056 | |
f1c6775b | 3057 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3058 | |
3c588192 MM |
3059 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3060 | if (err < 0) | |
3061 | return err; | |
3062 | ||
9dc9affc MM |
3063 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3064 | if (err < 0) | |
3065 | l2cap_seq_list_free(&chan->srej_list); | |
3066 | ||
3067 | return err; | |
0565c1c2 GP |
3068 | } |
3069 | ||
f2fcfcd6 GP |
3070 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3071 | { | |
3072 | switch (mode) { | |
3073 | case L2CAP_MODE_STREAMING: | |
3074 | case L2CAP_MODE_ERTM: | |
3075 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3076 | return mode; | |
3077 | /* fall through */ | |
3078 | default: | |
3079 | return L2CAP_MODE_BASIC; | |
3080 | } | |
3081 | } | |
3082 | ||
6327eb98 AE |
3083 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
3084 | { | |
3085 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
3086 | } | |
3087 | ||
f89cef09 AE |
3088 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
3089 | { | |
3090 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
3091 | } | |
3092 | ||
36c86c85 MM |
3093 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3094 | struct l2cap_conf_rfc *rfc) | |
3095 | { | |
3096 | if (chan->local_amp_id && chan->hs_hcon) { | |
3097 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; | |
3098 | ||
3099 | /* Class 1 devices have must have ERTM timeouts | |
3100 | * exceeding the Link Supervision Timeout. The | |
3101 | * default Link Supervision Timeout for AMP | |
3102 | * controllers is 10 seconds. | |
3103 | * | |
3104 | * Class 1 devices use 0xffffffff for their | |
3105 | * best-effort flush timeout, so the clamping logic | |
3106 | * will result in a timeout that meets the above | |
3107 | * requirement. ERTM timeouts are 16-bit values, so | |
3108 | * the maximum timeout is 65.535 seconds. | |
3109 | */ | |
3110 | ||
3111 | /* Convert timeout to milliseconds and round */ | |
3112 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3113 | ||
3114 | /* This is the recommended formula for class 2 devices | |
3115 | * that start ERTM timers when packets are sent to the | |
3116 | * controller. | |
3117 | */ | |
3118 | ertm_to = 3 * ertm_to + 500; | |
3119 | ||
3120 | if (ertm_to > 0xffff) | |
3121 | ertm_to = 0xffff; | |
3122 | ||
3123 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3124 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3125 | } else { | |
3126 | rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3127 | rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3128 | } | |
3129 | } | |
3130 | ||
6327eb98 AE |
3131 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3132 | { | |
3133 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
2d792818 | 3134 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
3135 | /* use extended control field */ |
3136 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3137 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3138 | } else { | |
6327eb98 | 3139 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3140 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3141 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3142 | } | |
c20f8e35 | 3143 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3144 | } |
3145 | ||
710f9b0a | 3146 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3147 | { |
1da177e4 | 3148 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3149 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3150 | void *ptr = req->data; |
c8f79162 | 3151 | u16 size; |
1da177e4 | 3152 | |
49208c9c | 3153 | BT_DBG("chan %p", chan); |
1da177e4 | 3154 | |
73ffa904 | 3155 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3156 | goto done; |
3157 | ||
0c1bc5c6 | 3158 | switch (chan->mode) { |
f2fcfcd6 GP |
3159 | case L2CAP_MODE_STREAMING: |
3160 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3161 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3162 | break; |
85eb53c6 | 3163 | |
f89cef09 AE |
3164 | if (__l2cap_efs_supported(chan)) |
3165 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3166 | ||
2ba13ed6 | 3167 | /* fall through */ |
f2fcfcd6 | 3168 | default: |
8c1d787b | 3169 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3170 | break; |
3171 | } | |
3172 | ||
3173 | done: | |
0c1bc5c6 GP |
3174 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3175 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3176 | |
0c1bc5c6 | 3177 | switch (chan->mode) { |
65c7c491 | 3178 | case L2CAP_MODE_BASIC: |
8c1d787b | 3179 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3180 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3181 | break; |
3182 | ||
62547752 GP |
3183 | rfc.mode = L2CAP_MODE_BASIC; |
3184 | rfc.txwin_size = 0; | |
3185 | rfc.max_transmit = 0; | |
3186 | rfc.retrans_timeout = 0; | |
3187 | rfc.monitor_timeout = 0; | |
3188 | rfc.max_pdu_size = 0; | |
3189 | ||
63406504 | 3190 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3191 | (unsigned long) &rfc); |
65c7c491 MH |
3192 | break; |
3193 | ||
3194 | case L2CAP_MODE_ERTM: | |
3195 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3196 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3197 | |
3198 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3199 | |
3200 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3201 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3202 | L2CAP_FCS_SIZE); | |
c8f79162 | 3203 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3204 | |
6327eb98 AE |
3205 | l2cap_txwin_setup(chan); |
3206 | ||
3207 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3208 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3209 | |
63406504 | 3210 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3211 | (unsigned long) &rfc); |
63406504 | 3212 | |
f89cef09 AE |
3213 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3214 | l2cap_add_opt_efs(&ptr, chan); | |
3215 | ||
6327eb98 AE |
3216 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3217 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3218 | chan->tx_win); |
60918918 AE |
3219 | |
3220 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3221 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3222 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3223 | chan->fcs = L2CAP_FCS_NONE; |
3224 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3225 | chan->fcs); | |
3226 | } | |
f2fcfcd6 GP |
3227 | break; |
3228 | ||
3229 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3230 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3231 | rfc.mode = L2CAP_MODE_STREAMING; |
3232 | rfc.txwin_size = 0; | |
3233 | rfc.max_transmit = 0; | |
3234 | rfc.retrans_timeout = 0; | |
3235 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3236 | |
3237 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3238 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3239 | L2CAP_FCS_SIZE); | |
c8f79162 | 3240 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3241 | |
63406504 | 3242 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3243 | (unsigned long) &rfc); |
63406504 | 3244 | |
f89cef09 AE |
3245 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3246 | l2cap_add_opt_efs(&ptr, chan); | |
3247 | ||
60918918 AE |
3248 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3249 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3250 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3251 | chan->fcs = L2CAP_FCS_NONE; |
3252 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3253 | chan->fcs); | |
3254 | } | |
65c7c491 MH |
3255 | break; |
3256 | } | |
1da177e4 | 3257 | |
fe4128e0 | 3258 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3259 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
3260 | |
3261 | return ptr - data; | |
3262 | } | |
3263 | ||
73ffa904 | 3264 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3265 | { |
5dee9e7c MH |
3266 | struct l2cap_conf_rsp *rsp = data; |
3267 | void *ptr = rsp->data; | |
73ffa904 GP |
3268 | void *req = chan->conf_req; |
3269 | int len = chan->conf_len; | |
5dee9e7c MH |
3270 | int type, hint, olen; |
3271 | unsigned long val; | |
6464f35f | 3272 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3273 | struct l2cap_conf_efs efs; |
3274 | u8 remote_efs = 0; | |
861d6882 | 3275 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3276 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3277 | u16 size; |
1da177e4 | 3278 | |
73ffa904 | 3279 | BT_DBG("chan %p", chan); |
820ae1b8 | 3280 | |
5dee9e7c MH |
3281 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3282 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3283 | |
589d2746 | 3284 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3285 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3286 | |
3287 | switch (type) { | |
3288 | case L2CAP_CONF_MTU: | |
861d6882 | 3289 | mtu = val; |
5dee9e7c MH |
3290 | break; |
3291 | ||
3292 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3293 | chan->flush_to = val; |
5dee9e7c MH |
3294 | break; |
3295 | ||
3296 | case L2CAP_CONF_QOS: | |
3297 | break; | |
3298 | ||
6464f35f MH |
3299 | case L2CAP_CONF_RFC: |
3300 | if (olen == sizeof(rfc)) | |
3301 | memcpy(&rfc, (void *) val, olen); | |
3302 | break; | |
3303 | ||
fcc203c3 GP |
3304 | case L2CAP_CONF_FCS: |
3305 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3306 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3307 | break; |
fcc203c3 | 3308 | |
42dceae2 AE |
3309 | case L2CAP_CONF_EFS: |
3310 | remote_efs = 1; | |
3311 | if (olen == sizeof(efs)) | |
3312 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3313 | break; |
3314 | ||
6327eb98 AE |
3315 | case L2CAP_CONF_EWS: |
3316 | if (!enable_hs) | |
3317 | return -ECONNREFUSED; | |
fcc203c3 | 3318 | |
6327eb98 AE |
3319 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3320 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3321 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3322 | chan->remote_tx_win = val; |
fcc203c3 GP |
3323 | break; |
3324 | ||
5dee9e7c MH |
3325 | default: |
3326 | if (hint) | |
3327 | break; | |
3328 | ||
3329 | result = L2CAP_CONF_UNKNOWN; | |
3330 | *((u8 *) ptr++) = type; | |
3331 | break; | |
3332 | } | |
3333 | } | |
3334 | ||
73ffa904 | 3335 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3336 | goto done; |
3337 | ||
0c1bc5c6 | 3338 | switch (chan->mode) { |
f2fcfcd6 GP |
3339 | case L2CAP_MODE_STREAMING: |
3340 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3341 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3342 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3343 | chan->conn->feat_mask); |
85eb53c6 GP |
3344 | break; |
3345 | } | |
3346 | ||
42dceae2 AE |
3347 | if (remote_efs) { |
3348 | if (__l2cap_efs_supported(chan)) | |
3349 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3350 | else | |
3351 | return -ECONNREFUSED; | |
3352 | } | |
3353 | ||
0c1bc5c6 | 3354 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3355 | return -ECONNREFUSED; |
742e519b | 3356 | |
f2fcfcd6 | 3357 | break; |
f2fcfcd6 GP |
3358 | } |
3359 | ||
3360 | done: | |
0c1bc5c6 | 3361 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3362 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3363 | rfc.mode = chan->mode; |
f2fcfcd6 | 3364 | |
73ffa904 | 3365 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3366 | return -ECONNREFUSED; |
3367 | ||
2d792818 GP |
3368 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3369 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3370 | } |
3371 | ||
5dee9e7c MH |
3372 | if (result == L2CAP_CONF_SUCCESS) { |
3373 | /* Configure output options and let the other side know | |
3374 | * which ones we don't like. */ | |
3375 | ||
f2fcfcd6 GP |
3376 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3377 | result = L2CAP_CONF_UNACCEPT; | |
3378 | else { | |
0c1bc5c6 | 3379 | chan->omtu = mtu; |
c1360a1c | 3380 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3381 | } |
0c1bc5c6 | 3382 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3383 | |
42dceae2 AE |
3384 | if (remote_efs) { |
3385 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3386 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3387 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3388 | |
3389 | result = L2CAP_CONF_UNACCEPT; | |
3390 | ||
3391 | if (chan->num_conf_req >= 1) | |
3392 | return -ECONNREFUSED; | |
3393 | ||
3394 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3395 | sizeof(efs), |
3396 | (unsigned long) &efs); | |
0e8b207e | 3397 | } else { |
3e6b3b95 | 3398 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3399 | result = L2CAP_CONF_PENDING; |
3400 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3401 | } |
3402 | } | |
3403 | ||
f2fcfcd6 GP |
3404 | switch (rfc.mode) { |
3405 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3406 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3407 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3408 | break; |
3409 | ||
3410 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3411 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3412 | chan->remote_tx_win = rfc.txwin_size; | |
3413 | else | |
3414 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3415 | |
2c03a7a4 | 3416 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3417 | |
c8f79162 | 3418 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3419 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3420 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3421 | rfc.max_pdu_size = cpu_to_le16(size); |
3422 | chan->remote_mps = size; | |
f2fcfcd6 | 3423 | |
36c86c85 | 3424 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3425 | |
c1360a1c | 3426 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3427 | |
3428 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3429 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3430 | |
42dceae2 AE |
3431 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3432 | chan->remote_id = efs.id; | |
3433 | chan->remote_stype = efs.stype; | |
3434 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3435 | chan->remote_flush_to = | |
2d792818 | 3436 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3437 | chan->remote_acc_lat = |
2d792818 | 3438 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3439 | chan->remote_sdu_itime = |
3440 | le32_to_cpu(efs.sdu_itime); | |
3441 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3442 | sizeof(efs), |
3443 | (unsigned long) &efs); | |
42dceae2 | 3444 | } |
f2fcfcd6 GP |
3445 | break; |
3446 | ||
3447 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3448 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3449 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3450 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3451 | rfc.max_pdu_size = cpu_to_le16(size); |
3452 | chan->remote_mps = size; | |
f2fcfcd6 | 3453 | |
c1360a1c | 3454 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3455 | |
2d792818 GP |
3456 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3457 | (unsigned long) &rfc); | |
68ae6639 | 3458 | |
f2fcfcd6 GP |
3459 | break; |
3460 | ||
3461 | default: | |
5dee9e7c | 3462 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3463 | |
6464f35f | 3464 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3465 | rfc.mode = chan->mode; |
f2fcfcd6 | 3466 | } |
6464f35f | 3467 | |
f2fcfcd6 | 3468 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3469 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3470 | } |
fe4128e0 | 3471 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3472 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3473 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3474 | |
3475 | return ptr - data; | |
1da177e4 LT |
3476 | } |
3477 | ||
2d792818 GP |
3478 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3479 | void *data, u16 *result) | |
f2fcfcd6 | 3480 | { |
f2fcfcd6 GP |
3481 | struct l2cap_conf_req *req = data; |
3482 | void *ptr = req->data; | |
3483 | int type, olen; | |
3484 | unsigned long val; | |
36e999a8 | 3485 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3486 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3487 | |
fe4128e0 | 3488 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3489 | |
3490 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3491 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3492 | ||
3493 | switch (type) { | |
3494 | case L2CAP_CONF_MTU: | |
3495 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3496 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3497 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3498 | } else |
0c1bc5c6 GP |
3499 | chan->imtu = val; |
3500 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3501 | break; |
3502 | ||
3503 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3504 | chan->flush_to = val; |
f2fcfcd6 | 3505 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3506 | 2, chan->flush_to); |
f2fcfcd6 GP |
3507 | break; |
3508 | ||
3509 | case L2CAP_CONF_RFC: | |
3510 | if (olen == sizeof(rfc)) | |
3511 | memcpy(&rfc, (void *)val, olen); | |
3512 | ||
c1360a1c | 3513 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3514 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3515 | return -ECONNREFUSED; |
3516 | ||
47d1ec61 | 3517 | chan->fcs = 0; |
f2fcfcd6 GP |
3518 | |
3519 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3520 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3521 | break; |
6327eb98 AE |
3522 | |
3523 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3524 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3525 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3526 | chan->tx_win); |
6327eb98 | 3527 | break; |
66af7aaf AE |
3528 | |
3529 | case L2CAP_CONF_EFS: | |
3530 | if (olen == sizeof(efs)) | |
3531 | memcpy(&efs, (void *)val, olen); | |
3532 | ||
3533 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3534 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3535 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3536 | return -ECONNREFUSED; |
3537 | ||
2d792818 GP |
3538 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3539 | (unsigned long) &efs); | |
66af7aaf | 3540 | break; |
cbabee78 AE |
3541 | |
3542 | case L2CAP_CONF_FCS: | |
3543 | if (*result == L2CAP_CONF_PENDING) | |
3544 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3545 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3546 | &chan->conf_state); |
3547 | break; | |
f2fcfcd6 GP |
3548 | } |
3549 | } | |
3550 | ||
0c1bc5c6 | 3551 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3552 | return -ECONNREFUSED; |
3553 | ||
0c1bc5c6 | 3554 | chan->mode = rfc.mode; |
6c2ea7a8 | 3555 | |
0e8b207e | 3556 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3557 | switch (rfc.mode) { |
3558 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3559 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3560 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3561 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3562 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3563 | chan->ack_win = min_t(u16, chan->ack_win, | |
3564 | rfc.txwin_size); | |
66af7aaf AE |
3565 | |
3566 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3567 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3568 | chan->local_sdu_itime = | |
2d792818 | 3569 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3570 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3571 | chan->local_flush_to = | |
2d792818 | 3572 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3573 | } |
f2fcfcd6 | 3574 | break; |
66af7aaf | 3575 | |
f2fcfcd6 | 3576 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3577 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3578 | } |
3579 | } | |
3580 | ||
fe4128e0 | 3581 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3582 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3583 | |
3584 | return ptr - data; | |
3585 | } | |
3586 | ||
2d792818 GP |
3587 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3588 | u16 result, u16 flags) | |
1da177e4 LT |
3589 | { |
3590 | struct l2cap_conf_rsp *rsp = data; | |
3591 | void *ptr = rsp->data; | |
1da177e4 | 3592 | |
fe4128e0 | 3593 | BT_DBG("chan %p", chan); |
1da177e4 | 3594 | |
fe4128e0 | 3595 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3596 | rsp->result = cpu_to_le16(result); |
aca3192c | 3597 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3598 | |
3599 | return ptr - data; | |
3600 | } | |
3601 | ||
8c1d787b | 3602 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3603 | { |
3604 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3605 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3606 | u8 buf[128]; |
439f34ac | 3607 | u8 rsp_code; |
710f9b0a | 3608 | |
fe4128e0 GP |
3609 | rsp.scid = cpu_to_le16(chan->dcid); |
3610 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3611 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3612 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3613 | |
3614 | if (chan->hs_hcon) | |
3615 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3616 | else | |
3617 | rsp_code = L2CAP_CONN_RSP; | |
3618 | ||
3619 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3620 | ||
3621 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3622 | |
c1360a1c | 3623 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3624 | return; |
3625 | ||
710f9b0a | 3626 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3627 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3628 | chan->num_conf_req++; |
3629 | } | |
3630 | ||
47d1ec61 | 3631 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3632 | { |
7b1c0049 GP |
3633 | int type, olen; |
3634 | unsigned long val; | |
c20f8e35 MM |
3635 | /* Use sane default values in case a misbehaving remote device |
3636 | * did not send an RFC or extended window size option. | |
3637 | */ | |
3638 | u16 txwin_ext = chan->ack_win; | |
3639 | struct l2cap_conf_rfc rfc = { | |
3640 | .mode = chan->mode, | |
3641 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3642 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3643 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3644 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3645 | }; | |
7b1c0049 | 3646 | |
47d1ec61 | 3647 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3648 | |
0c1bc5c6 | 3649 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3650 | return; |
3651 | ||
3652 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3653 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3654 | ||
c20f8e35 MM |
3655 | switch (type) { |
3656 | case L2CAP_CONF_RFC: | |
3657 | if (olen == sizeof(rfc)) | |
3658 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3659 | break; |
c20f8e35 MM |
3660 | case L2CAP_CONF_EWS: |
3661 | txwin_ext = val; | |
3662 | break; | |
3663 | } | |
7b1c0049 GP |
3664 | } |
3665 | ||
7b1c0049 GP |
3666 | switch (rfc.mode) { |
3667 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3668 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3669 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3670 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3671 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3672 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3673 | else | |
3674 | chan->ack_win = min_t(u16, chan->ack_win, | |
3675 | rfc.txwin_size); | |
7b1c0049 GP |
3676 | break; |
3677 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3678 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3679 | } |
3680 | } | |
3681 | ||
2d792818 | 3682 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3683 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3684 | u8 *data) | |
4e8402a3 | 3685 | { |
e2fd318e | 3686 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3687 | |
cb3b3152 JH |
3688 | if (cmd_len < sizeof(*rej)) |
3689 | return -EPROTO; | |
3690 | ||
e2fd318e | 3691 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3692 | return 0; |
3693 | ||
3694 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3695 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3696 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3697 | |
3698 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3699 | conn->info_ident = 0; |
984947dc | 3700 | |
4e8402a3 MH |
3701 | l2cap_conn_start(conn); |
3702 | } | |
3703 | ||
3704 | return 0; | |
3705 | } | |
3706 | ||
1700915f MM |
3707 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3708 | struct l2cap_cmd_hdr *cmd, | |
3709 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3710 | { |
1da177e4 LT |
3711 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3712 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3713 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3714 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3715 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3716 | |
3717 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3718 | __le16 psm = req->psm; |
1da177e4 | 3719 | |
097db76c | 3720 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3721 | |
3722 | /* Check if we have socket listening on psm */ | |
c2287681 | 3723 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3724 | if (!pchan) { |
1da177e4 LT |
3725 | result = L2CAP_CR_BAD_PSM; |
3726 | goto sendresp; | |
3727 | } | |
3728 | ||
23691d75 GP |
3729 | parent = pchan->sk; |
3730 | ||
3df91ea2 | 3731 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3732 | lock_sock(parent); |
e0f0cb56 | 3733 | |
e7c29cb1 | 3734 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3735 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3736 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3737 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3738 | result = L2CAP_CR_SEC_BLOCK; |
3739 | goto response; | |
3740 | } | |
3741 | ||
1da177e4 LT |
3742 | result = L2CAP_CR_NO_MEM; |
3743 | ||
2dfa1003 GP |
3744 | /* Check if we already have channel with that dcid */ |
3745 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3746 | goto response; | |
3747 | ||
80b98027 | 3748 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3749 | if (!chan) |
1da177e4 LT |
3750 | goto response; |
3751 | ||
80808e43 GP |
3752 | sk = chan->sk; |
3753 | ||
1da177e4 LT |
3754 | hci_conn_hold(conn->hcon); |
3755 | ||
1da177e4 LT |
3756 | bacpy(&bt_sk(sk)->src, conn->src); |
3757 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3758 | chan->psm = psm; |
3759 | chan->dcid = scid; | |
1700915f | 3760 | chan->local_amp_id = amp_id; |
1da177e4 | 3761 | |
6be36555 | 3762 | __l2cap_chan_add(conn, chan); |
48454079 | 3763 | |
fe4128e0 | 3764 | dcid = chan->scid; |
1da177e4 | 3765 | |
c9b66675 | 3766 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3767 | |
fc7f8a7e | 3768 | chan->ident = cmd->ident; |
1da177e4 | 3769 | |
984947dc | 3770 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3771 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3772 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3773 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3774 | result = L2CAP_CR_PEND; |
3775 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3776 | chan->ops->defer(chan); |
f66dc81f | 3777 | } else { |
1700915f MM |
3778 | /* Force pending result for AMP controllers. |
3779 | * The connection will succeed after the | |
3780 | * physical link is up. | |
3781 | */ | |
3782 | if (amp_id) { | |
3783 | __l2cap_state_change(chan, BT_CONNECT2); | |
3784 | result = L2CAP_CR_PEND; | |
3785 | } else { | |
3786 | __l2cap_state_change(chan, BT_CONFIG); | |
3787 | result = L2CAP_CR_SUCCESS; | |
3788 | } | |
f66dc81f MH |
3789 | status = L2CAP_CS_NO_INFO; |
3790 | } | |
79d554a6 | 3791 | } else { |
0e587be7 | 3792 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3793 | result = L2CAP_CR_PEND; |
3794 | status = L2CAP_CS_AUTHEN_PEND; | |
3795 | } | |
3796 | } else { | |
0e587be7 | 3797 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3798 | result = L2CAP_CR_PEND; |
3799 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3800 | } |
3801 | ||
1da177e4 | 3802 | response: |
aa2ac881 | 3803 | release_sock(parent); |
3df91ea2 | 3804 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3805 | |
3806 | sendresp: | |
aca3192c YH |
3807 | rsp.scid = cpu_to_le16(scid); |
3808 | rsp.dcid = cpu_to_le16(dcid); | |
3809 | rsp.result = cpu_to_le16(result); | |
3810 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3811 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3812 | |
3813 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3814 | struct l2cap_info_req info; | |
ac73498c | 3815 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3816 | |
3817 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3818 | conn->info_ident = l2cap_get_ident(conn); | |
3819 | ||
ba13ccd9 | 3820 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3821 | |
2d792818 GP |
3822 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3823 | sizeof(info), &info); | |
79d554a6 MH |
3824 | } |
3825 | ||
c1360a1c | 3826 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3827 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3828 | u8 buf[128]; |
c1360a1c | 3829 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3830 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3831 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3832 | chan->num_conf_req++; |
e9aeb2dd | 3833 | } |
1700915f MM |
3834 | |
3835 | return chan; | |
4c89b6aa | 3836 | } |
e9aeb2dd | 3837 | |
4c89b6aa | 3838 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3839 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3840 | { |
7b064eda JK |
3841 | struct hci_dev *hdev = conn->hcon->hdev; |
3842 | struct hci_conn *hcon = conn->hcon; | |
3843 | ||
cb3b3152 JH |
3844 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3845 | return -EPROTO; | |
3846 | ||
7b064eda JK |
3847 | hci_dev_lock(hdev); |
3848 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3849 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3850 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3851 | hcon->dst_type, 0, NULL, 0, | |
3852 | hcon->dev_class); | |
3853 | hci_dev_unlock(hdev); | |
3854 | ||
300229f9 | 3855 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3856 | return 0; |
3857 | } | |
3858 | ||
5909cf30 | 3859 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3860 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3861 | u8 *data) | |
1da177e4 LT |
3862 | { |
3863 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3864 | u16 scid, dcid, result, status; | |
48454079 | 3865 | struct l2cap_chan *chan; |
1da177e4 | 3866 | u8 req[128]; |
3df91ea2 | 3867 | int err; |
1da177e4 | 3868 | |
cb3b3152 JH |
3869 | if (cmd_len < sizeof(*rsp)) |
3870 | return -EPROTO; | |
3871 | ||
1da177e4 LT |
3872 | scid = __le16_to_cpu(rsp->scid); |
3873 | dcid = __le16_to_cpu(rsp->dcid); | |
3874 | result = __le16_to_cpu(rsp->result); | |
3875 | status = __le16_to_cpu(rsp->status); | |
3876 | ||
1b009c98 | 3877 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3878 | dcid, scid, result, status); |
1da177e4 | 3879 | |
3df91ea2 AE |
3880 | mutex_lock(&conn->chan_lock); |
3881 | ||
1da177e4 | 3882 | if (scid) { |
3df91ea2 AE |
3883 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3884 | if (!chan) { | |
3885 | err = -EFAULT; | |
3886 | goto unlock; | |
3887 | } | |
1da177e4 | 3888 | } else { |
3df91ea2 AE |
3889 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3890 | if (!chan) { | |
3891 | err = -EFAULT; | |
3892 | goto unlock; | |
3893 | } | |
1da177e4 LT |
3894 | } |
3895 | ||
3df91ea2 AE |
3896 | err = 0; |
3897 | ||
6be36555 | 3898 | l2cap_chan_lock(chan); |
48454079 | 3899 | |
1da177e4 LT |
3900 | switch (result) { |
3901 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3902 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3903 | chan->ident = 0; |
fe4128e0 | 3904 | chan->dcid = dcid; |
c1360a1c | 3905 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3906 | |
c1360a1c | 3907 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3908 | break; |
3909 | ||
1da177e4 | 3910 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3911 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3912 | chan->num_conf_req++; |
1da177e4 LT |
3913 | break; |
3914 | ||
3915 | case L2CAP_CR_PEND: | |
c1360a1c | 3916 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3917 | break; |
3918 | ||
3919 | default: | |
48454079 | 3920 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3921 | break; |
3922 | } | |
3923 | ||
6be36555 | 3924 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3925 | |
3926 | unlock: | |
3927 | mutex_unlock(&conn->chan_lock); | |
3928 | ||
3929 | return err; | |
1da177e4 LT |
3930 | } |
3931 | ||
47d1ec61 | 3932 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3933 | { |
3934 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3935 | * sides request it. | |
3936 | */ | |
0c1bc5c6 | 3937 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3938 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3939 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3940 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3941 | } |
3942 | ||
29d8a590 AE |
3943 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3944 | u8 ident, u16 flags) | |
3945 | { | |
3946 | struct l2cap_conn *conn = chan->conn; | |
3947 | ||
3948 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3949 | flags); | |
3950 | ||
3951 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3952 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3953 | ||
3954 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3955 | l2cap_build_conf_rsp(chan, data, | |
3956 | L2CAP_CONF_SUCCESS, flags), data); | |
3957 | } | |
3958 | ||
2d792818 GP |
3959 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3960 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3961 | u8 *data) | |
1da177e4 LT |
3962 | { |
3963 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3964 | u16 dcid, flags; | |
3965 | u8 rsp[64]; | |
48454079 | 3966 | struct l2cap_chan *chan; |
3c588192 | 3967 | int len, err = 0; |
1da177e4 | 3968 | |
cb3b3152 JH |
3969 | if (cmd_len < sizeof(*req)) |
3970 | return -EPROTO; | |
3971 | ||
1da177e4 LT |
3972 | dcid = __le16_to_cpu(req->dcid); |
3973 | flags = __le16_to_cpu(req->flags); | |
3974 | ||
3975 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3976 | ||
baa7e1fa | 3977 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3978 | if (!chan) |
1da177e4 LT |
3979 | return -ENOENT; |
3980 | ||
033b1142 | 3981 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3982 | struct l2cap_cmd_rej_cid rej; |
3983 | ||
ac73498c | 3984 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3985 | rej.scid = cpu_to_le16(chan->scid); |
3986 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3987 | |
df6bd743 | 3988 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2d792818 | 3989 | sizeof(rej), &rej); |
354f60a9 | 3990 | goto unlock; |
df6bd743 | 3991 | } |
354f60a9 | 3992 | |
5dee9e7c | 3993 | /* Reject if config buffer is too small. */ |
88219a0f | 3994 | len = cmd_len - sizeof(*req); |
cb3b3152 | 3995 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3996 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
3997 | l2cap_build_conf_rsp(chan, rsp, |
3998 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
3999 | goto unlock; |
4000 | } | |
4001 | ||
4002 | /* Store config. */ | |
73ffa904 GP |
4003 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4004 | chan->conf_len += len; | |
1da177e4 | 4005 | |
59e54bd1 | 4006 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4007 | /* Incomplete config. Send empty response. */ |
4008 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4009 | l2cap_build_conf_rsp(chan, rsp, |
4010 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4011 | goto unlock; |
4012 | } | |
4013 | ||
4014 | /* Complete config. */ | |
73ffa904 | 4015 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4016 | if (len < 0) { |
5e4e3972 | 4017 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4018 | goto unlock; |
f2fcfcd6 | 4019 | } |
1da177e4 | 4020 | |
1500109b | 4021 | chan->ident = cmd->ident; |
5dee9e7c | 4022 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4023 | chan->num_conf_rsp++; |
5dee9e7c | 4024 | |
5dee9e7c | 4025 | /* Reset config buffer. */ |
73ffa904 | 4026 | chan->conf_len = 0; |
5dee9e7c | 4027 | |
c1360a1c | 4028 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4029 | goto unlock; |
4030 | ||
c1360a1c | 4031 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4032 | set_default_fcs(chan); |
fcc203c3 | 4033 | |
105bdf9e MM |
4034 | if (chan->mode == L2CAP_MODE_ERTM || |
4035 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4036 | err = l2cap_ertm_init(chan); |
4037 | ||
4038 | if (err < 0) | |
5e4e3972 | 4039 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4040 | else |
4041 | l2cap_chan_ready(chan); | |
0565c1c2 | 4042 | |
876d9484 MH |
4043 | goto unlock; |
4044 | } | |
4045 | ||
c1360a1c | 4046 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4047 | u8 buf[64]; |
1da177e4 | 4048 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4049 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4050 | chan->num_conf_req++; |
1da177e4 LT |
4051 | } |
4052 | ||
0e8b207e AE |
4053 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4054 | Conf Rsp PENDING in the code above */ | |
4055 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4056 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4057 | |
4058 | /* check compatibility */ | |
4059 | ||
79de886d | 4060 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4061 | if (!chan->hs_hcon) |
79de886d AE |
4062 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4063 | else | |
4064 | chan->ident = cmd->ident; | |
0e8b207e AE |
4065 | } |
4066 | ||
1da177e4 | 4067 | unlock: |
6be36555 | 4068 | l2cap_chan_unlock(chan); |
3c588192 | 4069 | return err; |
1da177e4 LT |
4070 | } |
4071 | ||
2d792818 | 4072 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4073 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4074 | u8 *data) | |
1da177e4 LT |
4075 | { |
4076 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4077 | u16 scid, flags, result; | |
48454079 | 4078 | struct l2cap_chan *chan; |
cb3b3152 | 4079 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4080 | int err = 0; |
1da177e4 | 4081 | |
cb3b3152 JH |
4082 | if (cmd_len < sizeof(*rsp)) |
4083 | return -EPROTO; | |
4084 | ||
1da177e4 LT |
4085 | scid = __le16_to_cpu(rsp->scid); |
4086 | flags = __le16_to_cpu(rsp->flags); | |
4087 | result = __le16_to_cpu(rsp->result); | |
4088 | ||
61386cba AE |
4089 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4090 | result, len); | |
1da177e4 | 4091 | |
baa7e1fa | 4092 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4093 | if (!chan) |
1da177e4 LT |
4094 | return 0; |
4095 | ||
4096 | switch (result) { | |
4097 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4098 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4099 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4100 | break; |
4101 | ||
0e8b207e AE |
4102 | case L2CAP_CONF_PENDING: |
4103 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4104 | ||
4105 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4106 | char buf[64]; | |
4107 | ||
4108 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4109 | buf, &result); |
0e8b207e | 4110 | if (len < 0) { |
5e4e3972 | 4111 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4112 | goto done; |
4113 | } | |
4114 | ||
f351bc72 | 4115 | if (!chan->hs_hcon) { |
79de886d AE |
4116 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4117 | 0); | |
5ce66b59 AE |
4118 | } else { |
4119 | if (l2cap_check_efs(chan)) { | |
4120 | amp_create_logical_link(chan); | |
4121 | chan->ident = cmd->ident; | |
4122 | } | |
4123 | } | |
0e8b207e AE |
4124 | } |
4125 | goto done; | |
4126 | ||
1da177e4 | 4127 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4128 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4129 | char req[64]; |
4130 | ||
c2c77ec8 | 4131 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4132 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4133 | goto done; |
4134 | } | |
4135 | ||
f2fcfcd6 GP |
4136 | /* throw out any old stored conf requests */ |
4137 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4138 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4139 | req, &result); |
f2fcfcd6 | 4140 | if (len < 0) { |
5e4e3972 | 4141 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4142 | goto done; |
4143 | } | |
4144 | ||
4145 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4146 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4147 | chan->num_conf_req++; |
f2fcfcd6 GP |
4148 | if (result != L2CAP_CONF_SUCCESS) |
4149 | goto done; | |
4150 | break; | |
1da177e4 LT |
4151 | } |
4152 | ||
8e87d142 | 4153 | default: |
6be36555 | 4154 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4155 | |
ba13ccd9 | 4156 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4157 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4158 | goto done; |
4159 | } | |
4160 | ||
59e54bd1 | 4161 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4162 | goto done; |
4163 | ||
c1360a1c | 4164 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4165 | |
c1360a1c | 4166 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4167 | set_default_fcs(chan); |
fcc203c3 | 4168 | |
105bdf9e MM |
4169 | if (chan->mode == L2CAP_MODE_ERTM || |
4170 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4171 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4172 | |
3c588192 | 4173 | if (err < 0) |
5e4e3972 | 4174 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4175 | else |
4176 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4177 | } |
4178 | ||
4179 | done: | |
6be36555 | 4180 | l2cap_chan_unlock(chan); |
3c588192 | 4181 | return err; |
1da177e4 LT |
4182 | } |
4183 | ||
2d792818 | 4184 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4185 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4186 | u8 *data) | |
1da177e4 LT |
4187 | { |
4188 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4189 | struct l2cap_disconn_rsp rsp; | |
4190 | u16 dcid, scid; | |
48454079 | 4191 | struct l2cap_chan *chan; |
1da177e4 LT |
4192 | struct sock *sk; |
4193 | ||
cb3b3152 JH |
4194 | if (cmd_len != sizeof(*req)) |
4195 | return -EPROTO; | |
4196 | ||
1da177e4 LT |
4197 | scid = __le16_to_cpu(req->scid); |
4198 | dcid = __le16_to_cpu(req->dcid); | |
4199 | ||
4200 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4201 | ||
3df91ea2 AE |
4202 | mutex_lock(&conn->chan_lock); |
4203 | ||
4204 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4205 | if (!chan) { | |
4206 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4207 | return 0; |
3df91ea2 | 4208 | } |
1da177e4 | 4209 | |
6be36555 AE |
4210 | l2cap_chan_lock(chan); |
4211 | ||
48454079 GP |
4212 | sk = chan->sk; |
4213 | ||
fe4128e0 GP |
4214 | rsp.dcid = cpu_to_le16(chan->scid); |
4215 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4216 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4217 | ||
6be36555 | 4218 | lock_sock(sk); |
1da177e4 | 4219 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 4220 | release_sock(sk); |
1da177e4 | 4221 | |
61d6ef3e | 4222 | l2cap_chan_hold(chan); |
48454079 | 4223 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4224 | |
4225 | l2cap_chan_unlock(chan); | |
1da177e4 | 4226 | |
80b98027 | 4227 | chan->ops->close(chan); |
61d6ef3e | 4228 | l2cap_chan_put(chan); |
3df91ea2 AE |
4229 | |
4230 | mutex_unlock(&conn->chan_lock); | |
4231 | ||
1da177e4 LT |
4232 | return 0; |
4233 | } | |
4234 | ||
2d792818 | 4235 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4236 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4237 | u8 *data) | |
1da177e4 LT |
4238 | { |
4239 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4240 | u16 dcid, scid; | |
48454079 | 4241 | struct l2cap_chan *chan; |
1da177e4 | 4242 | |
cb3b3152 JH |
4243 | if (cmd_len != sizeof(*rsp)) |
4244 | return -EPROTO; | |
4245 | ||
1da177e4 LT |
4246 | scid = __le16_to_cpu(rsp->scid); |
4247 | dcid = __le16_to_cpu(rsp->dcid); | |
4248 | ||
4249 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4250 | ||
3df91ea2 AE |
4251 | mutex_lock(&conn->chan_lock); |
4252 | ||
4253 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4254 | if (!chan) { | |
4255 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4256 | return 0; |
3df91ea2 | 4257 | } |
1da177e4 | 4258 | |
6be36555 | 4259 | l2cap_chan_lock(chan); |
48454079 | 4260 | |
61d6ef3e | 4261 | l2cap_chan_hold(chan); |
48454079 | 4262 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4263 | |
4264 | l2cap_chan_unlock(chan); | |
1da177e4 | 4265 | |
80b98027 | 4266 | chan->ops->close(chan); |
61d6ef3e | 4267 | l2cap_chan_put(chan); |
3df91ea2 AE |
4268 | |
4269 | mutex_unlock(&conn->chan_lock); | |
4270 | ||
1da177e4 LT |
4271 | return 0; |
4272 | } | |
4273 | ||
2d792818 | 4274 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4275 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4276 | u8 *data) | |
1da177e4 LT |
4277 | { |
4278 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4279 | u16 type; |
4280 | ||
cb3b3152 JH |
4281 | if (cmd_len != sizeof(*req)) |
4282 | return -EPROTO; | |
4283 | ||
1da177e4 LT |
4284 | type = __le16_to_cpu(req->type); |
4285 | ||
4286 | BT_DBG("type 0x%4.4x", type); | |
4287 | ||
f0709e03 MH |
4288 | if (type == L2CAP_IT_FEAT_MASK) { |
4289 | u8 buf[8]; | |
44dd46de | 4290 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4291 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
4292 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4293 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4294 | if (!disable_ertm) |
fcc203c3 | 4295 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4296 | | L2CAP_FEAT_FCS; |
a5fd6f30 | 4297 | if (enable_hs) |
6327eb98 | 4298 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4299 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4300 | |
1b7bf4ed | 4301 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4302 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4303 | buf); | |
e1027a7c MH |
4304 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4305 | u8 buf[12]; | |
4306 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
4307 | |
4308 | if (enable_hs) | |
4309 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
4310 | else | |
4311 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4312 | ||
ac73498c AE |
4313 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4314 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4315 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4316 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4317 | buf); | |
f0709e03 MH |
4318 | } else { |
4319 | struct l2cap_info_rsp rsp; | |
4320 | rsp.type = cpu_to_le16(type); | |
ac73498c | 4321 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4322 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4323 | &rsp); | |
f0709e03 | 4324 | } |
1da177e4 LT |
4325 | |
4326 | return 0; | |
4327 | } | |
4328 | ||
2d792818 | 4329 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4330 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4331 | u8 *data) | |
1da177e4 LT |
4332 | { |
4333 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4334 | u16 type, result; | |
4335 | ||
cb3b3152 JH |
4336 | if (cmd_len != sizeof(*rsp)) |
4337 | return -EPROTO; | |
4338 | ||
1da177e4 LT |
4339 | type = __le16_to_cpu(rsp->type); |
4340 | result = __le16_to_cpu(rsp->result); | |
4341 | ||
4342 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4343 | ||
e90165be AE |
4344 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4345 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4346 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4347 | return 0; |
4348 | ||
17cd3f37 | 4349 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4350 | |
adb08ede VT |
4351 | if (result != L2CAP_IR_SUCCESS) { |
4352 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4353 | conn->info_ident = 0; | |
4354 | ||
4355 | l2cap_conn_start(conn); | |
4356 | ||
4357 | return 0; | |
4358 | } | |
4359 | ||
978c93b9 AE |
4360 | switch (type) { |
4361 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4362 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4363 | |
47ec1dcd | 4364 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4365 | struct l2cap_info_req req; |
ac73498c | 4366 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4367 | |
4368 | conn->info_ident = l2cap_get_ident(conn); | |
4369 | ||
4370 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4371 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4372 | } else { |
4373 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4374 | conn->info_ident = 0; | |
4375 | ||
4376 | l2cap_conn_start(conn); | |
4377 | } | |
978c93b9 AE |
4378 | break; |
4379 | ||
4380 | case L2CAP_IT_FIXED_CHAN: | |
4381 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4382 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4383 | conn->info_ident = 0; |
984947dc MH |
4384 | |
4385 | l2cap_conn_start(conn); | |
978c93b9 | 4386 | break; |
984947dc | 4387 | } |
4e8402a3 | 4388 | |
1da177e4 LT |
4389 | return 0; |
4390 | } | |
4391 | ||
1700915f MM |
4392 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4393 | struct l2cap_cmd_hdr *cmd, | |
4394 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4395 | { |
4396 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4397 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4398 | struct l2cap_chan *chan; |
6e1df6a6 | 4399 | struct hci_dev *hdev; |
f94ff6ff MM |
4400 | u16 psm, scid; |
4401 | ||
4402 | if (cmd_len != sizeof(*req)) | |
4403 | return -EPROTO; | |
4404 | ||
4405 | if (!enable_hs) | |
4406 | return -EINVAL; | |
4407 | ||
4408 | psm = le16_to_cpu(req->psm); | |
4409 | scid = le16_to_cpu(req->scid); | |
4410 | ||
ad0ac6ca | 4411 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4412 | |
6e1df6a6 AE |
4413 | /* For controller id 0 make BR/EDR connection */ |
4414 | if (req->amp_id == HCI_BREDR_ID) { | |
4415 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, | |
4416 | req->amp_id); | |
4417 | return 0; | |
4418 | } | |
1700915f | 4419 | |
6e1df6a6 AE |
4420 | /* Validate AMP controller id */ |
4421 | hdev = hci_dev_get(req->amp_id); | |
4422 | if (!hdev) | |
4423 | goto error; | |
1700915f | 4424 | |
6e1df6a6 AE |
4425 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4426 | hci_dev_put(hdev); | |
4427 | goto error; | |
4428 | } | |
1700915f | 4429 | |
6e1df6a6 AE |
4430 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4431 | req->amp_id); | |
4432 | if (chan) { | |
4433 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4434 | struct hci_conn *hs_hcon; | |
1700915f | 4435 | |
6e1df6a6 AE |
4436 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst); |
4437 | if (!hs_hcon) { | |
4438 | hci_dev_put(hdev); | |
4439 | return -EFAULT; | |
1700915f MM |
4440 | } |
4441 | ||
6e1df6a6 AE |
4442 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4443 | ||
6e1df6a6 AE |
4444 | mgr->bredr_chan = chan; |
4445 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4446 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4447 | conn->mtu = hdev->block_mtu; |
1700915f | 4448 | } |
f94ff6ff | 4449 | |
6e1df6a6 | 4450 | hci_dev_put(hdev); |
f94ff6ff MM |
4451 | |
4452 | return 0; | |
6e1df6a6 AE |
4453 | |
4454 | error: | |
4455 | rsp.dcid = 0; | |
4456 | rsp.scid = cpu_to_le16(scid); | |
4457 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4458 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4459 | ||
4460 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4461 | sizeof(rsp), &rsp); | |
4462 | ||
4463 | return -EFAULT; | |
f94ff6ff MM |
4464 | } |
4465 | ||
8eb200bd MM |
4466 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4467 | { | |
4468 | struct l2cap_move_chan_req req; | |
4469 | u8 ident; | |
4470 | ||
4471 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4472 | ||
4473 | ident = l2cap_get_ident(chan->conn); | |
4474 | chan->ident = ident; | |
4475 | ||
4476 | req.icid = cpu_to_le16(chan->scid); | |
4477 | req.dest_amp_id = dest_amp_id; | |
4478 | ||
4479 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4480 | &req); | |
4481 | ||
4482 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4483 | } | |
4484 | ||
1500109b | 4485 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4486 | { |
4487 | struct l2cap_move_chan_rsp rsp; | |
4488 | ||
1500109b | 4489 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4490 | |
1500109b | 4491 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4492 | rsp.result = cpu_to_le16(result); |
4493 | ||
1500109b MM |
4494 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4495 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4496 | } |
4497 | ||
5b155ef9 | 4498 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4499 | { |
4500 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4501 | |
5b155ef9 | 4502 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4503 | |
5b155ef9 | 4504 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4505 | |
5b155ef9 | 4506 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4507 | cfm.result = cpu_to_le16(result); |
4508 | ||
5b155ef9 MM |
4509 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4510 | sizeof(cfm), &cfm); | |
4511 | ||
4512 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4513 | } | |
4514 | ||
4515 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4516 | { | |
4517 | struct l2cap_move_chan_cfm cfm; | |
4518 | ||
4519 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4520 | ||
4521 | cfm.icid = cpu_to_le16(icid); | |
4522 | cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); | |
4523 | ||
4524 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4525 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4526 | } |
4527 | ||
4528 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4529 | u16 icid) |
8d5a04a1 MM |
4530 | { |
4531 | struct l2cap_move_chan_cfm_rsp rsp; | |
4532 | ||
ad0ac6ca | 4533 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4534 | |
4535 | rsp.icid = cpu_to_le16(icid); | |
4536 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4537 | } | |
4538 | ||
5f3847a4 MM |
4539 | static void __release_logical_link(struct l2cap_chan *chan) |
4540 | { | |
4541 | chan->hs_hchan = NULL; | |
4542 | chan->hs_hcon = NULL; | |
4543 | ||
4544 | /* Placeholder - release the logical link */ | |
4545 | } | |
4546 | ||
1500109b MM |
4547 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4548 | { | |
4549 | /* Logical link setup failed */ | |
4550 | if (chan->state != BT_CONNECTED) { | |
4551 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4552 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4553 | return; |
4554 | } | |
4555 | ||
4556 | switch (chan->move_role) { | |
4557 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4558 | l2cap_move_done(chan); | |
4559 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4560 | break; | |
4561 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4562 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4563 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4564 | /* Remote has only sent pending or | |
4565 | * success responses, clean up | |
4566 | */ | |
4567 | l2cap_move_done(chan); | |
4568 | } | |
4569 | ||
4570 | /* Other amp move states imply that the move | |
4571 | * has already aborted | |
4572 | */ | |
4573 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4574 | break; | |
4575 | } | |
4576 | } | |
4577 | ||
4578 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4579 | struct hci_chan *hchan) | |
4580 | { | |
4581 | struct l2cap_conf_rsp rsp; | |
1500109b | 4582 | |
336178a3 | 4583 | chan->hs_hchan = hchan; |
1500109b MM |
4584 | chan->hs_hcon->l2cap_data = chan->conn; |
4585 | ||
35ba9561 | 4586 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4587 | |
4588 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4589 | int err; |
1500109b MM |
4590 | |
4591 | set_default_fcs(chan); | |
4592 | ||
4593 | err = l2cap_ertm_init(chan); | |
4594 | if (err < 0) | |
5e4e3972 | 4595 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4596 | else |
4597 | l2cap_chan_ready(chan); | |
4598 | } | |
4599 | } | |
4600 | ||
4601 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4602 | struct hci_chan *hchan) | |
4603 | { | |
4604 | chan->hs_hcon = hchan->conn; | |
4605 | chan->hs_hcon->l2cap_data = chan->conn; | |
4606 | ||
4607 | BT_DBG("move_state %d", chan->move_state); | |
4608 | ||
4609 | switch (chan->move_state) { | |
4610 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4611 | /* Move confirm will be sent after a success | |
4612 | * response is received | |
4613 | */ | |
4614 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4615 | break; | |
4616 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4617 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4618 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4619 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4620 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4621 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4622 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4623 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4624 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4625 | } | |
4626 | break; | |
4627 | default: | |
4628 | /* Move was not in expected state, free the channel */ | |
4629 | __release_logical_link(chan); | |
4630 | ||
4631 | chan->move_state = L2CAP_MOVE_STABLE; | |
4632 | } | |
4633 | } | |
4634 | ||
4635 | /* Call with chan locked */ | |
27695fb4 AE |
4636 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4637 | u8 status) | |
5b155ef9 | 4638 | { |
1500109b MM |
4639 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4640 | ||
4641 | if (status) { | |
4642 | l2cap_logical_fail(chan); | |
4643 | __release_logical_link(chan); | |
4644 | return; | |
4645 | } | |
4646 | ||
4647 | if (chan->state != BT_CONNECTED) { | |
4648 | /* Ignore logical link if channel is on BR/EDR */ | |
4649 | if (chan->local_amp_id) | |
4650 | l2cap_logical_finish_create(chan, hchan); | |
4651 | } else { | |
4652 | l2cap_logical_finish_move(chan, hchan); | |
4653 | } | |
5b155ef9 MM |
4654 | } |
4655 | ||
3f7a56c4 MM |
4656 | void l2cap_move_start(struct l2cap_chan *chan) |
4657 | { | |
4658 | BT_DBG("chan %p", chan); | |
4659 | ||
4660 | if (chan->local_amp_id == HCI_BREDR_ID) { | |
4661 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) | |
4662 | return; | |
4663 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4664 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4665 | /* Placeholder - start physical link setup */ | |
4666 | } else { | |
4667 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4668 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4669 | chan->move_id = 0; | |
4670 | l2cap_move_setup(chan); | |
4671 | l2cap_send_move_chan_req(chan, 0); | |
4672 | } | |
4673 | } | |
4674 | ||
8eb200bd MM |
4675 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4676 | u8 local_amp_id, u8 remote_amp_id) | |
4677 | { | |
62748ca1 AE |
4678 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4679 | local_amp_id, remote_amp_id); | |
4680 | ||
12d6cc60 AE |
4681 | chan->fcs = L2CAP_FCS_NONE; |
4682 | ||
62748ca1 AE |
4683 | /* Outgoing channel on AMP */ |
4684 | if (chan->state == BT_CONNECT) { | |
4685 | if (result == L2CAP_CR_SUCCESS) { | |
4686 | chan->local_amp_id = local_amp_id; | |
4687 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4688 | } else { | |
4689 | /* Revert to BR/EDR connect */ | |
4690 | l2cap_send_conn_req(chan); | |
4691 | } | |
4692 | ||
4693 | return; | |
4694 | } | |
4695 | ||
4696 | /* Incoming channel on AMP */ | |
4697 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4698 | struct l2cap_conn_rsp rsp; |
4699 | char buf[128]; | |
4700 | rsp.scid = cpu_to_le16(chan->dcid); | |
4701 | rsp.dcid = cpu_to_le16(chan->scid); | |
4702 | ||
8eb200bd MM |
4703 | if (result == L2CAP_CR_SUCCESS) { |
4704 | /* Send successful response */ | |
62cd50e2 AE |
4705 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
4706 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4707 | } else { |
4708 | /* Send negative response */ | |
62cd50e2 AE |
4709 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4710 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4711 | } |
4712 | ||
4713 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4714 | sizeof(rsp), &rsp); | |
4715 | ||
4716 | if (result == L2CAP_CR_SUCCESS) { | |
4717 | __l2cap_state_change(chan, BT_CONFIG); | |
4718 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
4719 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4720 | L2CAP_CONF_REQ, | |
4721 | l2cap_build_conf_req(chan, buf), buf); | |
4722 | chan->num_conf_req++; | |
4723 | } | |
8eb200bd MM |
4724 | } |
4725 | } | |
4726 | ||
4727 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4728 | u8 remote_amp_id) | |
4729 | { | |
4730 | l2cap_move_setup(chan); | |
4731 | chan->move_id = local_amp_id; | |
4732 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4733 | ||
4734 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4735 | } | |
4736 | ||
4737 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4738 | { | |
4739 | struct hci_chan *hchan = NULL; | |
4740 | ||
4741 | /* Placeholder - get hci_chan for logical link */ | |
4742 | ||
4743 | if (hchan) { | |
4744 | if (hchan->state == BT_CONNECTED) { | |
4745 | /* Logical link is ready to go */ | |
4746 | chan->hs_hcon = hchan->conn; | |
4747 | chan->hs_hcon->l2cap_data = chan->conn; | |
4748 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4749 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4750 | ||
4751 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4752 | } else { | |
4753 | /* Wait for logical link to be ready */ | |
4754 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4755 | } | |
4756 | } else { | |
4757 | /* Logical link not available */ | |
4758 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4759 | } | |
4760 | } | |
4761 | ||
4762 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4763 | { | |
4764 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4765 | u8 rsp_result; | |
4766 | if (result == -EINVAL) | |
4767 | rsp_result = L2CAP_MR_BAD_ID; | |
4768 | else | |
4769 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4770 | ||
4771 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4772 | } | |
4773 | ||
4774 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4775 | chan->move_state = L2CAP_MOVE_STABLE; | |
4776 | ||
4777 | /* Restart data transmission */ | |
4778 | l2cap_ertm_send(chan); | |
4779 | } | |
4780 | ||
a514b17f AE |
4781 | /* Invoke with locked chan */ |
4782 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4783 | { |
770bfefa | 4784 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4785 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4786 | |
8eb200bd MM |
4787 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4788 | chan, result, local_amp_id, remote_amp_id); | |
4789 | ||
8eb200bd MM |
4790 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4791 | l2cap_chan_unlock(chan); | |
4792 | return; | |
4793 | } | |
4794 | ||
4795 | if (chan->state != BT_CONNECTED) { | |
4796 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4797 | } else if (result != L2CAP_MR_SUCCESS) { | |
4798 | l2cap_do_move_cancel(chan, result); | |
4799 | } else { | |
4800 | switch (chan->move_role) { | |
4801 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4802 | l2cap_do_move_initiate(chan, local_amp_id, | |
4803 | remote_amp_id); | |
4804 | break; | |
4805 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4806 | l2cap_do_move_respond(chan, result); | |
4807 | break; | |
4808 | default: | |
4809 | l2cap_do_move_cancel(chan, result); | |
4810 | break; | |
4811 | } | |
4812 | } | |
8eb200bd MM |
4813 | } |
4814 | ||
8d5a04a1 | 4815 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4816 | struct l2cap_cmd_hdr *cmd, |
4817 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4818 | { |
4819 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4820 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4821 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4822 | u16 icid = 0; |
4823 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4824 | ||
4825 | if (cmd_len != sizeof(*req)) | |
4826 | return -EPROTO; | |
4827 | ||
4828 | icid = le16_to_cpu(req->icid); | |
4829 | ||
ad0ac6ca | 4830 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4831 | |
4832 | if (!enable_hs) | |
4833 | return -EINVAL; | |
4834 | ||
02b0fbb9 MM |
4835 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4836 | if (!chan) { | |
1500109b MM |
4837 | rsp.icid = cpu_to_le16(icid); |
4838 | rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); | |
4839 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, | |
4840 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4841 | return 0; |
4842 | } | |
4843 | ||
1500109b MM |
4844 | chan->ident = cmd->ident; |
4845 | ||
02b0fbb9 MM |
4846 | if (chan->scid < L2CAP_CID_DYN_START || |
4847 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4848 | (chan->mode != L2CAP_MODE_ERTM && | |
4849 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4850 | result = L2CAP_MR_NOT_ALLOWED; | |
4851 | goto send_move_response; | |
4852 | } | |
4853 | ||
4854 | if (chan->local_amp_id == req->dest_amp_id) { | |
4855 | result = L2CAP_MR_SAME_ID; | |
4856 | goto send_move_response; | |
4857 | } | |
4858 | ||
4859 | if (req->dest_amp_id) { | |
4860 | struct hci_dev *hdev; | |
4861 | hdev = hci_dev_get(req->dest_amp_id); | |
4862 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4863 | !test_bit(HCI_UP, &hdev->flags)) { | |
4864 | if (hdev) | |
4865 | hci_dev_put(hdev); | |
4866 | ||
4867 | result = L2CAP_MR_BAD_ID; | |
4868 | goto send_move_response; | |
4869 | } | |
4870 | hci_dev_put(hdev); | |
4871 | } | |
4872 | ||
4873 | /* Detect a move collision. Only send a collision response | |
4874 | * if this side has "lost", otherwise proceed with the move. | |
4875 | * The winner has the larger bd_addr. | |
4876 | */ | |
4877 | if ((__chan_is_moving(chan) || | |
4878 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
4879 | bacmp(conn->src, conn->dst) > 0) { | |
4880 | result = L2CAP_MR_COLLISION; | |
4881 | goto send_move_response; | |
4882 | } | |
4883 | ||
02b0fbb9 MM |
4884 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4885 | l2cap_move_setup(chan); | |
4886 | chan->move_id = req->dest_amp_id; | |
4887 | icid = chan->dcid; | |
4888 | ||
4889 | if (!req->dest_amp_id) { | |
4890 | /* Moving to BR/EDR */ | |
4891 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4892 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4893 | result = L2CAP_MR_PEND; | |
4894 | } else { | |
4895 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4896 | result = L2CAP_MR_SUCCESS; | |
4897 | } | |
4898 | } else { | |
4899 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4900 | /* Placeholder - uncomment when amp functions are available */ | |
4901 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4902 | result = L2CAP_MR_PEND; | |
4903 | } | |
4904 | ||
4905 | send_move_response: | |
1500109b | 4906 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4907 | |
02b0fbb9 MM |
4908 | l2cap_chan_unlock(chan); |
4909 | ||
8d5a04a1 MM |
4910 | return 0; |
4911 | } | |
4912 | ||
5b155ef9 MM |
4913 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4914 | { | |
4915 | struct l2cap_chan *chan; | |
4916 | struct hci_chan *hchan = NULL; | |
4917 | ||
4918 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4919 | if (!chan) { | |
4920 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4921 | return; | |
4922 | } | |
4923 | ||
4924 | __clear_chan_timer(chan); | |
4925 | if (result == L2CAP_MR_PEND) | |
4926 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4927 | ||
4928 | switch (chan->move_state) { | |
4929 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4930 | /* Move confirm will be sent when logical link | |
4931 | * is complete. | |
4932 | */ | |
4933 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4934 | break; | |
4935 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4936 | if (result == L2CAP_MR_PEND) { | |
4937 | break; | |
4938 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4939 | &chan->conn_state)) { | |
4940 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4941 | } else { | |
4942 | /* Logical link is up or moving to BR/EDR, | |
4943 | * proceed with move | |
4944 | */ | |
4945 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4946 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4947 | } | |
4948 | break; | |
4949 | case L2CAP_MOVE_WAIT_RSP: | |
4950 | /* Moving to AMP */ | |
4951 | if (result == L2CAP_MR_SUCCESS) { | |
4952 | /* Remote is ready, send confirm immediately | |
4953 | * after logical link is ready | |
4954 | */ | |
4955 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4956 | } else { | |
4957 | /* Both logical link and move success | |
4958 | * are required to confirm | |
4959 | */ | |
4960 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
4961 | } | |
4962 | ||
4963 | /* Placeholder - get hci_chan for logical link */ | |
4964 | if (!hchan) { | |
4965 | /* Logical link not available */ | |
4966 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4967 | break; | |
4968 | } | |
4969 | ||
4970 | /* If the logical link is not yet connected, do not | |
4971 | * send confirmation. | |
4972 | */ | |
4973 | if (hchan->state != BT_CONNECTED) | |
4974 | break; | |
4975 | ||
4976 | /* Logical link is already ready to go */ | |
4977 | ||
4978 | chan->hs_hcon = hchan->conn; | |
4979 | chan->hs_hcon->l2cap_data = chan->conn; | |
4980 | ||
4981 | if (result == L2CAP_MR_SUCCESS) { | |
4982 | /* Can confirm now */ | |
4983 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4984 | } else { | |
4985 | /* Now only need move success | |
4986 | * to confirm | |
4987 | */ | |
4988 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4989 | } | |
4990 | ||
4991 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4992 | break; | |
4993 | default: | |
4994 | /* Any other amp move state means the move failed. */ | |
4995 | chan->move_id = chan->local_amp_id; | |
4996 | l2cap_move_done(chan); | |
4997 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4998 | } | |
4999 | ||
5000 | l2cap_chan_unlock(chan); | |
5001 | } | |
5002 | ||
5003 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5004 | u16 result) | |
5005 | { | |
5006 | struct l2cap_chan *chan; | |
5007 | ||
5008 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5009 | if (!chan) { | |
5010 | /* Could not locate channel, icid is best guess */ | |
5011 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5012 | return; | |
5013 | } | |
5014 | ||
5015 | __clear_chan_timer(chan); | |
5016 | ||
5017 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5018 | if (result == L2CAP_MR_COLLISION) { | |
5019 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5020 | } else { | |
5021 | /* Cleanup - cancel move */ | |
5022 | chan->move_id = chan->local_amp_id; | |
5023 | l2cap_move_done(chan); | |
5024 | } | |
5025 | } | |
5026 | ||
5027 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5028 | ||
5029 | l2cap_chan_unlock(chan); | |
5030 | } | |
5031 | ||
5032 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5033 | struct l2cap_cmd_hdr *cmd, | |
5034 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5035 | { |
5036 | struct l2cap_move_chan_rsp *rsp = data; | |
5037 | u16 icid, result; | |
5038 | ||
5039 | if (cmd_len != sizeof(*rsp)) | |
5040 | return -EPROTO; | |
5041 | ||
5042 | icid = le16_to_cpu(rsp->icid); | |
5043 | result = le16_to_cpu(rsp->result); | |
5044 | ||
ad0ac6ca | 5045 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5046 | |
5b155ef9 MM |
5047 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5048 | l2cap_move_continue(conn, icid, result); | |
5049 | else | |
5050 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5051 | |
5052 | return 0; | |
5053 | } | |
5054 | ||
5f3847a4 MM |
5055 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5056 | struct l2cap_cmd_hdr *cmd, | |
5057 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5058 | { |
5059 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5060 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5061 | u16 icid, result; |
5062 | ||
5063 | if (cmd_len != sizeof(*cfm)) | |
5064 | return -EPROTO; | |
5065 | ||
5066 | icid = le16_to_cpu(cfm->icid); | |
5067 | result = le16_to_cpu(cfm->result); | |
5068 | ||
ad0ac6ca | 5069 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5070 | |
5f3847a4 MM |
5071 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5072 | if (!chan) { | |
5073 | /* Spec requires a response even if the icid was not found */ | |
5074 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5075 | return 0; | |
5076 | } | |
5077 | ||
5078 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5079 | if (result == L2CAP_MC_CONFIRMED) { | |
5080 | chan->local_amp_id = chan->move_id; | |
5081 | if (!chan->local_amp_id) | |
5082 | __release_logical_link(chan); | |
5083 | } else { | |
5084 | chan->move_id = chan->local_amp_id; | |
5085 | } | |
5086 | ||
5087 | l2cap_move_done(chan); | |
5088 | } | |
5089 | ||
8d5a04a1 MM |
5090 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5091 | ||
5f3847a4 MM |
5092 | l2cap_chan_unlock(chan); |
5093 | ||
8d5a04a1 MM |
5094 | return 0; |
5095 | } | |
5096 | ||
5097 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5098 | struct l2cap_cmd_hdr *cmd, |
5099 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5100 | { |
5101 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5102 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5103 | u16 icid; |
5104 | ||
5105 | if (cmd_len != sizeof(*rsp)) | |
5106 | return -EPROTO; | |
5107 | ||
5108 | icid = le16_to_cpu(rsp->icid); | |
5109 | ||
ad0ac6ca | 5110 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5111 | |
3fd71a0a MM |
5112 | chan = l2cap_get_chan_by_scid(conn, icid); |
5113 | if (!chan) | |
5114 | return 0; | |
5115 | ||
5116 | __clear_chan_timer(chan); | |
5117 | ||
5118 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5119 | chan->local_amp_id = chan->move_id; | |
5120 | ||
5121 | if (!chan->local_amp_id && chan->hs_hchan) | |
5122 | __release_logical_link(chan); | |
5123 | ||
5124 | l2cap_move_done(chan); | |
5125 | } | |
5126 | ||
5127 | l2cap_chan_unlock(chan); | |
5128 | ||
8d5a04a1 MM |
5129 | return 0; |
5130 | } | |
5131 | ||
e2174ca4 | 5132 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 5133 | u16 to_multiplier) |
de73115a CT |
5134 | { |
5135 | u16 max_latency; | |
5136 | ||
5137 | if (min > max || min < 6 || max > 3200) | |
5138 | return -EINVAL; | |
5139 | ||
5140 | if (to_multiplier < 10 || to_multiplier > 3200) | |
5141 | return -EINVAL; | |
5142 | ||
5143 | if (max >= to_multiplier * 8) | |
5144 | return -EINVAL; | |
5145 | ||
5146 | max_latency = (to_multiplier * 8 / max) - 1; | |
5147 | if (latency > 499 || latency > max_latency) | |
5148 | return -EINVAL; | |
5149 | ||
5150 | return 0; | |
5151 | } | |
5152 | ||
5153 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
5154 | struct l2cap_cmd_hdr *cmd, |
5155 | u8 *data) | |
de73115a CT |
5156 | { |
5157 | struct hci_conn *hcon = conn->hcon; | |
5158 | struct l2cap_conn_param_update_req *req; | |
5159 | struct l2cap_conn_param_update_rsp rsp; | |
5160 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 5161 | int err; |
de73115a CT |
5162 | |
5163 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
5164 | return -EINVAL; | |
5165 | ||
5166 | cmd_len = __le16_to_cpu(cmd->len); | |
5167 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
5168 | return -EPROTO; | |
5169 | ||
5170 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5171 | min = __le16_to_cpu(req->min); |
5172 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5173 | latency = __le16_to_cpu(req->latency); |
5174 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5175 | ||
5176 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5177 | min, max, latency, to_multiplier); |
de73115a CT |
5178 | |
5179 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
5180 | |
5181 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
5182 | if (err) | |
ac73498c | 5183 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5184 | else |
ac73498c | 5185 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5186 | |
5187 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5188 | sizeof(rsp), &rsp); |
de73115a | 5189 | |
2ce603eb CT |
5190 | if (!err) |
5191 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
5192 | ||
de73115a CT |
5193 | return 0; |
5194 | } | |
5195 | ||
3300d9a9 | 5196 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5197 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5198 | u8 *data) | |
3300d9a9 CT |
5199 | { |
5200 | int err = 0; | |
5201 | ||
5202 | switch (cmd->code) { | |
5203 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5204 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5205 | break; |
5206 | ||
5207 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5208 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5209 | break; |
5210 | ||
5211 | case L2CAP_CONN_RSP: | |
f5a2598d | 5212 | case L2CAP_CREATE_CHAN_RSP: |
cb3b3152 | 5213 | err = l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5214 | break; |
5215 | ||
5216 | case L2CAP_CONF_REQ: | |
5217 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5218 | break; | |
5219 | ||
5220 | case L2CAP_CONF_RSP: | |
cb3b3152 | 5221 | err = l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5222 | break; |
5223 | ||
5224 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5225 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5226 | break; |
5227 | ||
5228 | case L2CAP_DISCONN_RSP: | |
cb3b3152 | 5229 | err = l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5230 | break; |
5231 | ||
5232 | case L2CAP_ECHO_REQ: | |
5233 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5234 | break; | |
5235 | ||
5236 | case L2CAP_ECHO_RSP: | |
5237 | break; | |
5238 | ||
5239 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5240 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5241 | break; |
5242 | ||
5243 | case L2CAP_INFO_RSP: | |
cb3b3152 | 5244 | err = l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5245 | break; |
5246 | ||
f94ff6ff MM |
5247 | case L2CAP_CREATE_CHAN_REQ: |
5248 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5249 | break; | |
5250 | ||
8d5a04a1 MM |
5251 | case L2CAP_MOVE_CHAN_REQ: |
5252 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5253 | break; | |
5254 | ||
5255 | case L2CAP_MOVE_CHAN_RSP: | |
5256 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
5257 | break; | |
5258 | ||
5259 | case L2CAP_MOVE_CHAN_CFM: | |
5260 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5261 | break; | |
5262 | ||
5263 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
5264 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
5265 | break; | |
5266 | ||
3300d9a9 CT |
5267 | default: |
5268 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5269 | err = -EINVAL; | |
5270 | break; | |
5271 | } | |
5272 | ||
5273 | return err; | |
5274 | } | |
5275 | ||
5276 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 5277 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
5278 | { |
5279 | switch (cmd->code) { | |
5280 | case L2CAP_COMMAND_REJ: | |
5281 | return 0; | |
5282 | ||
5283 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 5284 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
5285 | |
5286 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
5287 | return 0; | |
5288 | ||
5289 | default: | |
5290 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
5291 | return -EINVAL; | |
5292 | } | |
5293 | } | |
5294 | ||
c5623556 JH |
5295 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5296 | struct sk_buff *skb) | |
5297 | { | |
5298 | u8 *data = skb->data; | |
5299 | int len = skb->len; | |
5300 | struct l2cap_cmd_hdr cmd; | |
5301 | int err; | |
5302 | ||
5303 | l2cap_raw_recv(conn, skb); | |
5304 | ||
5305 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
5306 | u16 cmd_len; | |
5307 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); | |
5308 | data += L2CAP_CMD_HDR_SIZE; | |
5309 | len -= L2CAP_CMD_HDR_SIZE; | |
5310 | ||
5311 | cmd_len = le16_to_cpu(cmd.len); | |
5312 | ||
5313 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, | |
5314 | cmd.ident); | |
5315 | ||
5316 | if (cmd_len > len || !cmd.ident) { | |
5317 | BT_DBG("corrupted command"); | |
5318 | break; | |
5319 | } | |
5320 | ||
5321 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
5322 | if (err) { | |
5323 | struct l2cap_cmd_rej_unk rej; | |
5324 | ||
5325 | BT_ERR("Wrong link type (%d)", err); | |
5326 | ||
5327 | /* FIXME: Map err to a valid reason */ | |
5328 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); | |
5329 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, | |
5330 | sizeof(rej), &rej); | |
5331 | } | |
5332 | ||
5333 | data += cmd_len; | |
5334 | len -= cmd_len; | |
5335 | } | |
5336 | ||
5337 | kfree_skb(skb); | |
5338 | } | |
5339 | ||
3300d9a9 | 5340 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5341 | struct sk_buff *skb) |
1da177e4 LT |
5342 | { |
5343 | u8 *data = skb->data; | |
5344 | int len = skb->len; | |
5345 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5346 | int err; |
1da177e4 LT |
5347 | |
5348 | l2cap_raw_recv(conn, skb); | |
5349 | ||
5350 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 5351 | u16 cmd_len; |
1da177e4 LT |
5352 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5353 | data += L2CAP_CMD_HDR_SIZE; | |
5354 | len -= L2CAP_CMD_HDR_SIZE; | |
5355 | ||
88219a0f | 5356 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5357 | |
2d792818 GP |
5358 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5359 | cmd.ident); | |
1da177e4 | 5360 | |
88219a0f | 5361 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5362 | BT_DBG("corrupted command"); |
5363 | break; | |
5364 | } | |
5365 | ||
c5623556 | 5366 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5367 | if (err) { |
e2fd318e | 5368 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5369 | |
5370 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
5371 | |
5372 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 5373 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5374 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5375 | sizeof(rej), &rej); | |
1da177e4 LT |
5376 | } |
5377 | ||
88219a0f AV |
5378 | data += cmd_len; |
5379 | len -= cmd_len; | |
1da177e4 LT |
5380 | } |
5381 | ||
5382 | kfree_skb(skb); | |
5383 | } | |
5384 | ||
47d1ec61 | 5385 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5386 | { |
5387 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5388 | int hdr_size; |
5389 | ||
5390 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5391 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5392 | else | |
5393 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5394 | |
47d1ec61 | 5395 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5396 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5397 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5398 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5399 | ||
5400 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5401 | return -EBADMSG; |
fcc203c3 GP |
5402 | } |
5403 | return 0; | |
5404 | } | |
5405 | ||
6ea00485 | 5406 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5407 | { |
e31f7633 | 5408 | struct l2cap_ctrl control; |
d5392c8f | 5409 | |
e31f7633 | 5410 | BT_DBG("chan %p", chan); |
d5392c8f | 5411 | |
e31f7633 MM |
5412 | memset(&control, 0, sizeof(control)); |
5413 | control.sframe = 1; | |
5414 | control.final = 1; | |
5415 | control.reqseq = chan->buffer_seq; | |
5416 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5417 | |
e2ab4353 | 5418 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5419 | control.super = L2CAP_SUPER_RNR; |
5420 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5421 | } |
5422 | ||
e31f7633 MM |
5423 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5424 | chan->unacked_frames > 0) | |
5425 | __set_retrans_timer(chan); | |
d5392c8f | 5426 | |
e31f7633 | 5427 | /* Send pending iframes */ |
525cd185 | 5428 | l2cap_ertm_send(chan); |
d5392c8f | 5429 | |
e2ab4353 | 5430 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5431 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5432 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5433 | * send it now. | |
5434 | */ | |
5435 | control.super = L2CAP_SUPER_RR; | |
5436 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5437 | } |
5438 | } | |
5439 | ||
2d792818 GP |
5440 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5441 | struct sk_buff **last_frag) | |
18778a63 | 5442 | { |
84084a31 MM |
5443 | /* skb->len reflects data in skb as well as all fragments |
5444 | * skb->data_len reflects only data in fragments | |
5445 | */ | |
5446 | if (!skb_has_frag_list(skb)) | |
5447 | skb_shinfo(skb)->frag_list = new_frag; | |
5448 | ||
5449 | new_frag->next = NULL; | |
5450 | ||
5451 | (*last_frag)->next = new_frag; | |
5452 | *last_frag = new_frag; | |
5453 | ||
5454 | skb->len += new_frag->len; | |
5455 | skb->data_len += new_frag->len; | |
5456 | skb->truesize += new_frag->truesize; | |
5457 | } | |
5458 | ||
4b51dae9 MM |
5459 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5460 | struct l2cap_ctrl *control) | |
84084a31 MM |
5461 | { |
5462 | int err = -EINVAL; | |
18778a63 | 5463 | |
4b51dae9 | 5464 | switch (control->sar) { |
7e0ef6ee | 5465 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5466 | if (chan->sdu) |
5467 | break; | |
18778a63 | 5468 | |
80b98027 | 5469 | err = chan->ops->recv(chan, skb); |
84084a31 | 5470 | break; |
18778a63 | 5471 | |
7e0ef6ee | 5472 | case L2CAP_SAR_START: |
84084a31 MM |
5473 | if (chan->sdu) |
5474 | break; | |
18778a63 | 5475 | |
6f61fd47 | 5476 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5477 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5478 | |
84084a31 MM |
5479 | if (chan->sdu_len > chan->imtu) { |
5480 | err = -EMSGSIZE; | |
5481 | break; | |
5482 | } | |
1890d36b | 5483 | |
84084a31 MM |
5484 | if (skb->len >= chan->sdu_len) |
5485 | break; | |
18778a63 | 5486 | |
84084a31 MM |
5487 | chan->sdu = skb; |
5488 | chan->sdu_last_frag = skb; | |
18778a63 | 5489 | |
84084a31 MM |
5490 | skb = NULL; |
5491 | err = 0; | |
18778a63 GP |
5492 | break; |
5493 | ||
7e0ef6ee | 5494 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5495 | if (!chan->sdu) |
84084a31 | 5496 | break; |
18778a63 | 5497 | |
84084a31 MM |
5498 | append_skb_frag(chan->sdu, skb, |
5499 | &chan->sdu_last_frag); | |
5500 | skb = NULL; | |
18778a63 | 5501 | |
84084a31 MM |
5502 | if (chan->sdu->len >= chan->sdu_len) |
5503 | break; | |
4178ba46 | 5504 | |
84084a31 | 5505 | err = 0; |
18778a63 GP |
5506 | break; |
5507 | ||
7e0ef6ee | 5508 | case L2CAP_SAR_END: |
6f61fd47 | 5509 | if (!chan->sdu) |
84084a31 | 5510 | break; |
18778a63 | 5511 | |
84084a31 MM |
5512 | append_skb_frag(chan->sdu, skb, |
5513 | &chan->sdu_last_frag); | |
5514 | skb = NULL; | |
4178ba46 | 5515 | |
84084a31 MM |
5516 | if (chan->sdu->len != chan->sdu_len) |
5517 | break; | |
18778a63 | 5518 | |
80b98027 | 5519 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5520 | |
84084a31 MM |
5521 | if (!err) { |
5522 | /* Reassembly complete */ | |
5523 | chan->sdu = NULL; | |
5524 | chan->sdu_last_frag = NULL; | |
5525 | chan->sdu_len = 0; | |
1890d36b | 5526 | } |
18778a63 GP |
5527 | break; |
5528 | } | |
5529 | ||
84084a31 MM |
5530 | if (err) { |
5531 | kfree_skb(skb); | |
5532 | kfree_skb(chan->sdu); | |
5533 | chan->sdu = NULL; | |
5534 | chan->sdu_last_frag = NULL; | |
5535 | chan->sdu_len = 0; | |
5536 | } | |
18778a63 | 5537 | |
84084a31 | 5538 | return err; |
18778a63 GP |
5539 | } |
5540 | ||
32b32735 MM |
5541 | static int l2cap_resegment(struct l2cap_chan *chan) |
5542 | { | |
5543 | /* Placeholder */ | |
5544 | return 0; | |
5545 | } | |
5546 | ||
61aa4f5b | 5547 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5548 | { |
61aa4f5b | 5549 | u8 event; |
712132eb | 5550 | |
61aa4f5b MM |
5551 | if (chan->mode != L2CAP_MODE_ERTM) |
5552 | return; | |
712132eb | 5553 | |
61aa4f5b | 5554 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5555 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5556 | } |
5557 | ||
d2a7ac5d MM |
5558 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5559 | { | |
63838725 MM |
5560 | int err = 0; |
5561 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5562 | * until a gap is encountered. | |
5563 | */ | |
5564 | ||
5565 | BT_DBG("chan %p", chan); | |
5566 | ||
5567 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5568 | struct sk_buff *skb; | |
5569 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5570 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5571 | ||
5572 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5573 | ||
5574 | if (!skb) | |
5575 | break; | |
5576 | ||
5577 | skb_unlink(skb, &chan->srej_q); | |
5578 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5579 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5580 | if (err) | |
5581 | break; | |
5582 | } | |
5583 | ||
5584 | if (skb_queue_empty(&chan->srej_q)) { | |
5585 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5586 | l2cap_send_ack(chan); | |
5587 | } | |
5588 | ||
5589 | return err; | |
d2a7ac5d MM |
5590 | } |
5591 | ||
5592 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5593 | struct l2cap_ctrl *control) | |
5594 | { | |
f80842a8 MM |
5595 | struct sk_buff *skb; |
5596 | ||
5597 | BT_DBG("chan %p, control %p", chan, control); | |
5598 | ||
5599 | if (control->reqseq == chan->next_tx_seq) { | |
5600 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5601 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5602 | return; |
5603 | } | |
5604 | ||
5605 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5606 | ||
5607 | if (skb == NULL) { | |
5608 | BT_DBG("Seq %d not available for retransmission", | |
5609 | control->reqseq); | |
5610 | return; | |
5611 | } | |
5612 | ||
5613 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5614 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5615 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5616 | return; |
5617 | } | |
5618 | ||
5619 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5620 | ||
5621 | if (control->poll) { | |
5622 | l2cap_pass_to_tx(chan, control); | |
5623 | ||
5624 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5625 | l2cap_retransmit(chan, control); | |
5626 | l2cap_ertm_send(chan); | |
5627 | ||
5628 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5629 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5630 | chan->srej_save_reqseq = control->reqseq; | |
5631 | } | |
5632 | } else { | |
5633 | l2cap_pass_to_tx_fbit(chan, control); | |
5634 | ||
5635 | if (control->final) { | |
5636 | if (chan->srej_save_reqseq != control->reqseq || | |
5637 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5638 | &chan->conn_state)) | |
5639 | l2cap_retransmit(chan, control); | |
5640 | } else { | |
5641 | l2cap_retransmit(chan, control); | |
5642 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5643 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5644 | chan->srej_save_reqseq = control->reqseq; | |
5645 | } | |
5646 | } | |
5647 | } | |
d2a7ac5d MM |
5648 | } |
5649 | ||
5650 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5651 | struct l2cap_ctrl *control) | |
5652 | { | |
fcd289df MM |
5653 | struct sk_buff *skb; |
5654 | ||
5655 | BT_DBG("chan %p, control %p", chan, control); | |
5656 | ||
5657 | if (control->reqseq == chan->next_tx_seq) { | |
5658 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5659 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5660 | return; |
5661 | } | |
5662 | ||
5663 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5664 | ||
5665 | if (chan->max_tx && skb && | |
5666 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5667 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5668 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5669 | return; |
5670 | } | |
5671 | ||
5672 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5673 | ||
5674 | l2cap_pass_to_tx(chan, control); | |
5675 | ||
5676 | if (control->final) { | |
5677 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5678 | l2cap_retransmit_all(chan, control); | |
5679 | } else { | |
5680 | l2cap_retransmit_all(chan, control); | |
5681 | l2cap_ertm_send(chan); | |
5682 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5683 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5684 | } | |
d2a7ac5d MM |
5685 | } |
5686 | ||
4b51dae9 MM |
5687 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5688 | { | |
5689 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5690 | ||
5691 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5692 | chan->expected_tx_seq); | |
5693 | ||
5694 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5695 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5696 | chan->tx_win) { |
4b51dae9 MM |
5697 | /* See notes below regarding "double poll" and |
5698 | * invalid packets. | |
5699 | */ | |
5700 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5701 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5702 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5703 | } else { | |
5704 | BT_DBG("Invalid - in window after SREJ sent"); | |
5705 | return L2CAP_TXSEQ_INVALID; | |
5706 | } | |
5707 | } | |
5708 | ||
5709 | if (chan->srej_list.head == txseq) { | |
5710 | BT_DBG("Expected SREJ"); | |
5711 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
5712 | } | |
5713 | ||
5714 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
5715 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
5716 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
5717 | } | |
5718 | ||
5719 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
5720 | BT_DBG("Unexpected SREJ - not requested"); | |
5721 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
5722 | } | |
5723 | } | |
5724 | ||
5725 | if (chan->expected_tx_seq == txseq) { | |
5726 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
5727 | chan->tx_win) { | |
5728 | BT_DBG("Invalid - txseq outside tx window"); | |
5729 | return L2CAP_TXSEQ_INVALID; | |
5730 | } else { | |
5731 | BT_DBG("Expected"); | |
5732 | return L2CAP_TXSEQ_EXPECTED; | |
5733 | } | |
5734 | } | |
5735 | ||
5736 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 5737 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
5738 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
5739 | return L2CAP_TXSEQ_DUPLICATE; | |
5740 | } | |
5741 | ||
5742 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
5743 | /* A source of invalid packets is a "double poll" condition, | |
5744 | * where delays cause us to send multiple poll packets. If | |
5745 | * the remote stack receives and processes both polls, | |
5746 | * sequence numbers can wrap around in such a way that a | |
5747 | * resent frame has a sequence number that looks like new data | |
5748 | * with a sequence gap. This would trigger an erroneous SREJ | |
5749 | * request. | |
5750 | * | |
5751 | * Fortunately, this is impossible with a tx window that's | |
5752 | * less than half of the maximum sequence number, which allows | |
5753 | * invalid frames to be safely ignored. | |
5754 | * | |
5755 | * With tx window sizes greater than half of the tx window | |
5756 | * maximum, the frame is invalid and cannot be ignored. This | |
5757 | * causes a disconnect. | |
5758 | */ | |
5759 | ||
5760 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5761 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
5762 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5763 | } else { | |
5764 | BT_DBG("Invalid - txseq outside tx window"); | |
5765 | return L2CAP_TXSEQ_INVALID; | |
5766 | } | |
5767 | } else { | |
5768 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
5769 | return L2CAP_TXSEQ_UNEXPECTED; | |
5770 | } | |
5771 | } | |
5772 | ||
d2a7ac5d MM |
5773 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
5774 | struct l2cap_ctrl *control, | |
5775 | struct sk_buff *skb, u8 event) | |
5776 | { | |
5777 | int err = 0; | |
5778 | bool skb_in_use = 0; | |
5779 | ||
5780 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5781 | event); | |
5782 | ||
5783 | switch (event) { | |
5784 | case L2CAP_EV_RECV_IFRAME: | |
5785 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
5786 | case L2CAP_TXSEQ_EXPECTED: | |
5787 | l2cap_pass_to_tx(chan, control); | |
5788 | ||
5789 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5790 | BT_DBG("Busy, discarding expected seq %d", | |
5791 | control->txseq); | |
5792 | break; | |
5793 | } | |
5794 | ||
5795 | chan->expected_tx_seq = __next_seq(chan, | |
5796 | control->txseq); | |
5797 | ||
5798 | chan->buffer_seq = chan->expected_tx_seq; | |
5799 | skb_in_use = 1; | |
5800 | ||
5801 | err = l2cap_reassemble_sdu(chan, skb, control); | |
5802 | if (err) | |
5803 | break; | |
5804 | ||
5805 | if (control->final) { | |
5806 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5807 | &chan->conn_state)) { | |
5808 | control->final = 0; | |
5809 | l2cap_retransmit_all(chan, control); | |
5810 | l2cap_ertm_send(chan); | |
5811 | } | |
5812 | } | |
5813 | ||
5814 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
5815 | l2cap_send_ack(chan); | |
5816 | break; | |
5817 | case L2CAP_TXSEQ_UNEXPECTED: | |
5818 | l2cap_pass_to_tx(chan, control); | |
5819 | ||
5820 | /* Can't issue SREJ frames in the local busy state. | |
5821 | * Drop this frame, it will be seen as missing | |
5822 | * when local busy is exited. | |
5823 | */ | |
5824 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5825 | BT_DBG("Busy, discarding unexpected seq %d", | |
5826 | control->txseq); | |
5827 | break; | |
5828 | } | |
5829 | ||
5830 | /* There was a gap in the sequence, so an SREJ | |
5831 | * must be sent for each missing frame. The | |
5832 | * current frame is stored for later use. | |
5833 | */ | |
5834 | skb_queue_tail(&chan->srej_q, skb); | |
5835 | skb_in_use = 1; | |
5836 | BT_DBG("Queued %p (queue len %d)", skb, | |
5837 | skb_queue_len(&chan->srej_q)); | |
5838 | ||
5839 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5840 | l2cap_seq_list_clear(&chan->srej_list); | |
5841 | l2cap_send_srej(chan, control->txseq); | |
5842 | ||
5843 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
5844 | break; | |
5845 | case L2CAP_TXSEQ_DUPLICATE: | |
5846 | l2cap_pass_to_tx(chan, control); | |
5847 | break; | |
5848 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5849 | break; | |
5850 | case L2CAP_TXSEQ_INVALID: | |
5851 | default: | |
5e4e3972 | 5852 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
5853 | break; |
5854 | } | |
5855 | break; | |
5856 | case L2CAP_EV_RECV_RR: | |
5857 | l2cap_pass_to_tx(chan, control); | |
5858 | if (control->final) { | |
5859 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5860 | ||
e6a3ee6e MM |
5861 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
5862 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
5863 | control->final = 0; |
5864 | l2cap_retransmit_all(chan, control); | |
5865 | } | |
5866 | ||
5867 | l2cap_ertm_send(chan); | |
5868 | } else if (control->poll) { | |
5869 | l2cap_send_i_or_rr_or_rnr(chan); | |
5870 | } else { | |
5871 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5872 | &chan->conn_state) && | |
5873 | chan->unacked_frames) | |
5874 | __set_retrans_timer(chan); | |
5875 | ||
5876 | l2cap_ertm_send(chan); | |
5877 | } | |
5878 | break; | |
5879 | case L2CAP_EV_RECV_RNR: | |
5880 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5881 | l2cap_pass_to_tx(chan, control); | |
5882 | if (control && control->poll) { | |
5883 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5884 | l2cap_send_rr_or_rnr(chan, 0); | |
5885 | } | |
5886 | __clear_retrans_timer(chan); | |
5887 | l2cap_seq_list_clear(&chan->retrans_list); | |
5888 | break; | |
5889 | case L2CAP_EV_RECV_REJ: | |
5890 | l2cap_handle_rej(chan, control); | |
5891 | break; | |
5892 | case L2CAP_EV_RECV_SREJ: | |
5893 | l2cap_handle_srej(chan, control); | |
5894 | break; | |
5895 | default: | |
5896 | break; | |
5897 | } | |
5898 | ||
5899 | if (skb && !skb_in_use) { | |
5900 | BT_DBG("Freeing %p", skb); | |
5901 | kfree_skb(skb); | |
5902 | } | |
5903 | ||
5904 | return err; | |
5905 | } | |
5906 | ||
5907 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
5908 | struct l2cap_ctrl *control, | |
5909 | struct sk_buff *skb, u8 event) | |
5910 | { | |
5911 | int err = 0; | |
5912 | u16 txseq = control->txseq; | |
5913 | bool skb_in_use = 0; | |
5914 | ||
5915 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5916 | event); | |
5917 | ||
5918 | switch (event) { | |
5919 | case L2CAP_EV_RECV_IFRAME: | |
5920 | switch (l2cap_classify_txseq(chan, txseq)) { | |
5921 | case L2CAP_TXSEQ_EXPECTED: | |
5922 | /* Keep frame for reassembly later */ | |
5923 | l2cap_pass_to_tx(chan, control); | |
5924 | skb_queue_tail(&chan->srej_q, skb); | |
5925 | skb_in_use = 1; | |
5926 | BT_DBG("Queued %p (queue len %d)", skb, | |
5927 | skb_queue_len(&chan->srej_q)); | |
5928 | ||
5929 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
5930 | break; | |
5931 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
5932 | l2cap_seq_list_pop(&chan->srej_list); | |
5933 | ||
5934 | l2cap_pass_to_tx(chan, control); | |
5935 | skb_queue_tail(&chan->srej_q, skb); | |
5936 | skb_in_use = 1; | |
5937 | BT_DBG("Queued %p (queue len %d)", skb, | |
5938 | skb_queue_len(&chan->srej_q)); | |
5939 | ||
5940 | err = l2cap_rx_queued_iframes(chan); | |
5941 | if (err) | |
5942 | break; | |
5943 | ||
5944 | break; | |
5945 | case L2CAP_TXSEQ_UNEXPECTED: | |
5946 | /* Got a frame that can't be reassembled yet. | |
5947 | * Save it for later, and send SREJs to cover | |
5948 | * the missing frames. | |
5949 | */ | |
5950 | skb_queue_tail(&chan->srej_q, skb); | |
5951 | skb_in_use = 1; | |
5952 | BT_DBG("Queued %p (queue len %d)", skb, | |
5953 | skb_queue_len(&chan->srej_q)); | |
5954 | ||
5955 | l2cap_pass_to_tx(chan, control); | |
5956 | l2cap_send_srej(chan, control->txseq); | |
5957 | break; | |
5958 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
5959 | /* This frame was requested with an SREJ, but | |
5960 | * some expected retransmitted frames are | |
5961 | * missing. Request retransmission of missing | |
5962 | * SREJ'd frames. | |
5963 | */ | |
5964 | skb_queue_tail(&chan->srej_q, skb); | |
5965 | skb_in_use = 1; | |
5966 | BT_DBG("Queued %p (queue len %d)", skb, | |
5967 | skb_queue_len(&chan->srej_q)); | |
5968 | ||
5969 | l2cap_pass_to_tx(chan, control); | |
5970 | l2cap_send_srej_list(chan, control->txseq); | |
5971 | break; | |
5972 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
5973 | /* We've already queued this frame. Drop this copy. */ | |
5974 | l2cap_pass_to_tx(chan, control); | |
5975 | break; | |
5976 | case L2CAP_TXSEQ_DUPLICATE: | |
5977 | /* Expecting a later sequence number, so this frame | |
5978 | * was already received. Ignore it completely. | |
5979 | */ | |
5980 | break; | |
5981 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5982 | break; | |
5983 | case L2CAP_TXSEQ_INVALID: | |
5984 | default: | |
5e4e3972 | 5985 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
5986 | break; |
5987 | } | |
5988 | break; | |
5989 | case L2CAP_EV_RECV_RR: | |
5990 | l2cap_pass_to_tx(chan, control); | |
5991 | if (control->final) { | |
5992 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5993 | ||
5994 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5995 | &chan->conn_state)) { | |
5996 | control->final = 0; | |
5997 | l2cap_retransmit_all(chan, control); | |
5998 | } | |
5999 | ||
6000 | l2cap_ertm_send(chan); | |
6001 | } else if (control->poll) { | |
6002 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6003 | &chan->conn_state) && | |
6004 | chan->unacked_frames) { | |
6005 | __set_retrans_timer(chan); | |
6006 | } | |
6007 | ||
6008 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6009 | l2cap_send_srej_tail(chan); | |
6010 | } else { | |
6011 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6012 | &chan->conn_state) && | |
6013 | chan->unacked_frames) | |
6014 | __set_retrans_timer(chan); | |
6015 | ||
6016 | l2cap_send_ack(chan); | |
6017 | } | |
6018 | break; | |
6019 | case L2CAP_EV_RECV_RNR: | |
6020 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6021 | l2cap_pass_to_tx(chan, control); | |
6022 | if (control->poll) { | |
6023 | l2cap_send_srej_tail(chan); | |
6024 | } else { | |
6025 | struct l2cap_ctrl rr_control; | |
6026 | memset(&rr_control, 0, sizeof(rr_control)); | |
6027 | rr_control.sframe = 1; | |
6028 | rr_control.super = L2CAP_SUPER_RR; | |
6029 | rr_control.reqseq = chan->buffer_seq; | |
6030 | l2cap_send_sframe(chan, &rr_control); | |
6031 | } | |
6032 | ||
6033 | break; | |
6034 | case L2CAP_EV_RECV_REJ: | |
6035 | l2cap_handle_rej(chan, control); | |
6036 | break; | |
6037 | case L2CAP_EV_RECV_SREJ: | |
6038 | l2cap_handle_srej(chan, control); | |
6039 | break; | |
6040 | } | |
6041 | ||
6042 | if (skb && !skb_in_use) { | |
6043 | BT_DBG("Freeing %p", skb); | |
6044 | kfree_skb(skb); | |
6045 | } | |
6046 | ||
6047 | return err; | |
6048 | } | |
6049 | ||
32b32735 MM |
6050 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6051 | { | |
6052 | BT_DBG("chan %p", chan); | |
6053 | ||
6054 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6055 | ||
6056 | if (chan->hs_hcon) | |
6057 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6058 | else | |
6059 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6060 | ||
6061 | return l2cap_resegment(chan); | |
6062 | } | |
6063 | ||
6064 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6065 | struct l2cap_ctrl *control, | |
6066 | struct sk_buff *skb, u8 event) | |
6067 | { | |
6068 | int err; | |
6069 | ||
6070 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6071 | event); | |
6072 | ||
6073 | if (!control->poll) | |
6074 | return -EPROTO; | |
6075 | ||
6076 | l2cap_process_reqseq(chan, control->reqseq); | |
6077 | ||
6078 | if (!skb_queue_empty(&chan->tx_q)) | |
6079 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6080 | else | |
6081 | chan->tx_send_head = NULL; | |
6082 | ||
6083 | /* Rewind next_tx_seq to the point expected | |
6084 | * by the receiver. | |
6085 | */ | |
6086 | chan->next_tx_seq = control->reqseq; | |
6087 | chan->unacked_frames = 0; | |
6088 | ||
6089 | err = l2cap_finish_move(chan); | |
6090 | if (err) | |
6091 | return err; | |
6092 | ||
6093 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6094 | l2cap_send_i_or_rr_or_rnr(chan); | |
6095 | ||
6096 | if (event == L2CAP_EV_RECV_IFRAME) | |
6097 | return -EPROTO; | |
6098 | ||
6099 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6100 | } | |
6101 | ||
6102 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6103 | struct l2cap_ctrl *control, | |
6104 | struct sk_buff *skb, u8 event) | |
6105 | { | |
6106 | int err; | |
6107 | ||
6108 | if (!control->final) | |
6109 | return -EPROTO; | |
6110 | ||
6111 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6112 | ||
6113 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6114 | l2cap_process_reqseq(chan, control->reqseq); | |
6115 | ||
6116 | if (!skb_queue_empty(&chan->tx_q)) | |
6117 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6118 | else | |
6119 | chan->tx_send_head = NULL; | |
6120 | ||
6121 | /* Rewind next_tx_seq to the point expected | |
6122 | * by the receiver. | |
6123 | */ | |
6124 | chan->next_tx_seq = control->reqseq; | |
6125 | chan->unacked_frames = 0; | |
6126 | ||
6127 | if (chan->hs_hcon) | |
6128 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6129 | else | |
6130 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6131 | ||
6132 | err = l2cap_resegment(chan); | |
6133 | ||
6134 | if (!err) | |
6135 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6136 | ||
6137 | return err; | |
6138 | } | |
6139 | ||
d2a7ac5d MM |
6140 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6141 | { | |
6142 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6143 | u16 unacked; | |
6144 | ||
6145 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6146 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6147 | } | |
6148 | ||
cec8ab6e MM |
6149 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6150 | struct sk_buff *skb, u8 event) | |
218bb9df | 6151 | { |
d2a7ac5d MM |
6152 | int err = 0; |
6153 | ||
6154 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6155 | control, skb, event, chan->rx_state); | |
6156 | ||
6157 | if (__valid_reqseq(chan, control->reqseq)) { | |
6158 | switch (chan->rx_state) { | |
6159 | case L2CAP_RX_STATE_RECV: | |
6160 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6161 | break; | |
6162 | case L2CAP_RX_STATE_SREJ_SENT: | |
6163 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6164 | event); | |
6165 | break; | |
32b32735 MM |
6166 | case L2CAP_RX_STATE_WAIT_P: |
6167 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6168 | break; | |
6169 | case L2CAP_RX_STATE_WAIT_F: | |
6170 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6171 | break; | |
d2a7ac5d MM |
6172 | default: |
6173 | /* shut it down */ | |
6174 | break; | |
6175 | } | |
6176 | } else { | |
6177 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6178 | control->reqseq, chan->next_tx_seq, | |
6179 | chan->expected_ack_seq); | |
5e4e3972 | 6180 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6181 | } |
6182 | ||
6183 | return err; | |
cec8ab6e MM |
6184 | } |
6185 | ||
6186 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6187 | struct sk_buff *skb) | |
6188 | { | |
4b51dae9 MM |
6189 | int err = 0; |
6190 | ||
6191 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6192 | chan->rx_state); | |
6193 | ||
6194 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6195 | L2CAP_TXSEQ_EXPECTED) { | |
6196 | l2cap_pass_to_tx(chan, control); | |
6197 | ||
6198 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6199 | __next_seq(chan, chan->buffer_seq)); | |
6200 | ||
6201 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6202 | ||
6203 | l2cap_reassemble_sdu(chan, skb, control); | |
6204 | } else { | |
6205 | if (chan->sdu) { | |
6206 | kfree_skb(chan->sdu); | |
6207 | chan->sdu = NULL; | |
6208 | } | |
6209 | chan->sdu_last_frag = NULL; | |
6210 | chan->sdu_len = 0; | |
6211 | ||
6212 | if (skb) { | |
6213 | BT_DBG("Freeing %p", skb); | |
6214 | kfree_skb(skb); | |
6215 | } | |
6216 | } | |
6217 | ||
6218 | chan->last_acked_seq = control->txseq; | |
6219 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6220 | ||
6221 | return err; | |
cec8ab6e MM |
6222 | } |
6223 | ||
6224 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6225 | { | |
6226 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6227 | u16 len; | |
6228 | u8 event; | |
218bb9df | 6229 | |
b76bbd66 MM |
6230 | __unpack_control(chan, skb); |
6231 | ||
218bb9df GP |
6232 | len = skb->len; |
6233 | ||
6234 | /* | |
6235 | * We can just drop the corrupted I-frame here. | |
6236 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6237 | * procedures and ask for retransmission. |
218bb9df | 6238 | */ |
47d1ec61 | 6239 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6240 | goto drop; |
6241 | ||
cec8ab6e | 6242 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6243 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6244 | |
47d1ec61 | 6245 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6246 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6247 | |
47d1ec61 | 6248 | if (len > chan->mps) { |
5e4e3972 | 6249 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6250 | goto drop; |
6251 | } | |
6252 | ||
cec8ab6e MM |
6253 | if (!control->sframe) { |
6254 | int err; | |
218bb9df | 6255 | |
cec8ab6e MM |
6256 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6257 | control->sar, control->reqseq, control->final, | |
6258 | control->txseq); | |
218bb9df | 6259 | |
cec8ab6e MM |
6260 | /* Validate F-bit - F=0 always valid, F=1 only |
6261 | * valid in TX WAIT_F | |
6262 | */ | |
6263 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6264 | goto drop; |
cec8ab6e MM |
6265 | |
6266 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6267 | event = L2CAP_EV_RECV_IFRAME; | |
6268 | err = l2cap_rx(chan, control, skb, event); | |
6269 | } else { | |
6270 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6271 | } |
6272 | ||
cec8ab6e | 6273 | if (err) |
5e4e3972 | 6274 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6275 | } else { |
cec8ab6e MM |
6276 | const u8 rx_func_to_event[4] = { |
6277 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6278 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6279 | }; | |
6280 | ||
6281 | /* Only I-frames are expected in streaming mode */ | |
6282 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6283 | goto drop; | |
6284 | ||
6285 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6286 | control->reqseq, control->final, control->poll, | |
6287 | control->super); | |
6288 | ||
218bb9df | 6289 | if (len != 0) { |
1bb166e6 | 6290 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6291 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6292 | goto drop; |
6293 | } | |
6294 | ||
cec8ab6e MM |
6295 | /* Validate F and P bits */ |
6296 | if (control->final && (control->poll || | |
6297 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6298 | goto drop; | |
6299 | ||
6300 | event = rx_func_to_event[control->super]; | |
6301 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6302 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6303 | } |
6304 | ||
6305 | return 0; | |
6306 | ||
6307 | drop: | |
6308 | kfree_skb(skb); | |
6309 | return 0; | |
6310 | } | |
6311 | ||
13ca56e0 AE |
6312 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6313 | struct sk_buff *skb) | |
1da177e4 | 6314 | { |
48454079 | 6315 | struct l2cap_chan *chan; |
1da177e4 | 6316 | |
baa7e1fa | 6317 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6318 | if (!chan) { |
97e8e89d AE |
6319 | if (cid == L2CAP_CID_A2MP) { |
6320 | chan = a2mp_channel_create(conn, skb); | |
6321 | if (!chan) { | |
6322 | kfree_skb(skb); | |
13ca56e0 | 6323 | return; |
97e8e89d AE |
6324 | } |
6325 | ||
6326 | l2cap_chan_lock(chan); | |
6327 | } else { | |
6328 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6329 | /* Drop packet and return */ | |
6330 | kfree_skb(skb); | |
13ca56e0 | 6331 | return; |
97e8e89d | 6332 | } |
1da177e4 LT |
6333 | } |
6334 | ||
49208c9c | 6335 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6336 | |
89bc500e | 6337 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6338 | goto drop; |
6339 | ||
0c1bc5c6 | 6340 | switch (chan->mode) { |
1c2acffb GP |
6341 | case L2CAP_MODE_BASIC: |
6342 | /* If socket recv buffers overflows we drop data here | |
6343 | * which is *bad* because L2CAP has to be reliable. | |
6344 | * But we don't have any other choice. L2CAP doesn't | |
6345 | * provide flow control mechanism. */ | |
1da177e4 | 6346 | |
0c1bc5c6 | 6347 | if (chan->imtu < skb->len) |
1c2acffb | 6348 | goto drop; |
1da177e4 | 6349 | |
80b98027 | 6350 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6351 | goto done; |
6352 | break; | |
6353 | ||
6354 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6355 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6356 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6357 | goto done; |
6358 | ||
1c2acffb | 6359 | default: |
0c1bc5c6 | 6360 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6361 | break; |
6362 | } | |
1da177e4 LT |
6363 | |
6364 | drop: | |
6365 | kfree_skb(skb); | |
6366 | ||
6367 | done: | |
6be36555 | 6368 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6369 | } |
6370 | ||
84104b24 AE |
6371 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6372 | struct sk_buff *skb) | |
1da177e4 | 6373 | { |
23691d75 | 6374 | struct l2cap_chan *chan; |
1da177e4 | 6375 | |
c2287681 | 6376 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 6377 | if (!chan) |
1da177e4 LT |
6378 | goto drop; |
6379 | ||
5b4cedaa | 6380 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6381 | |
89bc500e | 6382 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6383 | goto drop; |
6384 | ||
e13e21dc | 6385 | if (chan->imtu < skb->len) |
1da177e4 LT |
6386 | goto drop; |
6387 | ||
80b98027 | 6388 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6389 | return; |
1da177e4 LT |
6390 | |
6391 | drop: | |
6392 | kfree_skb(skb); | |
1da177e4 LT |
6393 | } |
6394 | ||
72f78356 | 6395 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6396 | struct sk_buff *skb) |
9f69bda6 | 6397 | { |
23691d75 | 6398 | struct l2cap_chan *chan; |
9f69bda6 | 6399 | |
72f78356 MH |
6400 | chan = l2cap_global_chan_by_scid(0, L2CAP_CID_LE_DATA, |
6401 | conn->src, conn->dst); | |
23691d75 | 6402 | if (!chan) |
9f69bda6 GP |
6403 | goto drop; |
6404 | ||
5b4cedaa | 6405 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6406 | |
89bc500e | 6407 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
6408 | goto drop; |
6409 | ||
e13e21dc | 6410 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6411 | goto drop; |
6412 | ||
80b98027 | 6413 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6414 | return; |
9f69bda6 GP |
6415 | |
6416 | drop: | |
6417 | kfree_skb(skb); | |
9f69bda6 GP |
6418 | } |
6419 | ||
1da177e4 LT |
6420 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6421 | { | |
6422 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
6423 | u16 cid, len; |
6424 | __le16 psm; | |
1da177e4 LT |
6425 | |
6426 | skb_pull(skb, L2CAP_HDR_SIZE); | |
6427 | cid = __le16_to_cpu(lh->cid); | |
6428 | len = __le16_to_cpu(lh->len); | |
6429 | ||
1c2acffb GP |
6430 | if (len != skb->len) { |
6431 | kfree_skb(skb); | |
6432 | return; | |
6433 | } | |
6434 | ||
1da177e4 LT |
6435 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6436 | ||
6437 | switch (cid) { | |
3300d9a9 | 6438 | case L2CAP_CID_LE_SIGNALING: |
c5623556 JH |
6439 | l2cap_le_sig_channel(conn, skb); |
6440 | break; | |
8db4dc46 | 6441 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6442 | l2cap_sig_channel(conn, skb); |
6443 | break; | |
6444 | ||
8db4dc46 | 6445 | case L2CAP_CID_CONN_LESS: |
097db76c | 6446 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6447 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6448 | l2cap_conless_channel(conn, psm, skb); |
6449 | break; | |
6450 | ||
9f69bda6 | 6451 | case L2CAP_CID_LE_DATA: |
72f78356 | 6452 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6453 | break; |
6454 | ||
b501d6a1 AB |
6455 | case L2CAP_CID_SMP: |
6456 | if (smp_sig_channel(conn, skb)) | |
6457 | l2cap_conn_del(conn->hcon, EACCES); | |
6458 | break; | |
6459 | ||
1da177e4 LT |
6460 | default: |
6461 | l2cap_data_channel(conn, cid, skb); | |
6462 | break; | |
6463 | } | |
6464 | } | |
6465 | ||
6466 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
6467 | ||
686ebf28 | 6468 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
6469 | { |
6470 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 6471 | struct l2cap_chan *c; |
1da177e4 | 6472 | |
6ed93dc6 | 6473 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
6474 | |
6475 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
6476 | read_lock(&chan_list_lock); |
6477 | list_for_each_entry(c, &chan_list, global_l) { | |
6478 | struct sock *sk = c->sk; | |
4343478f | 6479 | |
89bc500e | 6480 | if (c->state != BT_LISTEN) |
1da177e4 LT |
6481 | continue; |
6482 | ||
6483 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 6484 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 6485 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 6486 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 6487 | exact++; |
2af6b9d5 MH |
6488 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
6489 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 6490 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
6491 | lm2 |= HCI_LM_MASTER; |
6492 | } | |
1da177e4 | 6493 | } |
23691d75 | 6494 | read_unlock(&chan_list_lock); |
1da177e4 LT |
6495 | |
6496 | return exact ? lm1 : lm2; | |
6497 | } | |
6498 | ||
9e664631 | 6499 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 6500 | { |
0139418c MH |
6501 | struct l2cap_conn *conn; |
6502 | ||
6ed93dc6 | 6503 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 6504 | |
1da177e4 | 6505 | if (!status) { |
baf43251 | 6506 | conn = l2cap_conn_add(hcon); |
1da177e4 LT |
6507 | if (conn) |
6508 | l2cap_conn_ready(conn); | |
ba6fc317 | 6509 | } else { |
e175072f | 6510 | l2cap_conn_del(hcon, bt_to_errno(status)); |
ba6fc317 | 6511 | } |
1da177e4 LT |
6512 | } |
6513 | ||
686ebf28 | 6514 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
6515 | { |
6516 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6517 | ||
6518 | BT_DBG("hcon %p", hcon); | |
6519 | ||
686ebf28 | 6520 | if (!conn) |
9f5a0d7b | 6521 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
6522 | return conn->disc_reason; |
6523 | } | |
6524 | ||
9e664631 | 6525 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
6526 | { |
6527 | BT_DBG("hcon %p reason %d", hcon, reason); | |
6528 | ||
e175072f | 6529 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
6530 | } |
6531 | ||
4343478f | 6532 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 6533 | { |
715ec005 | 6534 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
6535 | return; |
6536 | ||
f62e4323 | 6537 | if (encrypt == 0x00) { |
4343478f | 6538 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 6539 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 6540 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 6541 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 6542 | } else { |
4343478f | 6543 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 6544 | __clear_chan_timer(chan); |
f62e4323 MH |
6545 | } |
6546 | } | |
6547 | ||
686ebf28 | 6548 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 6549 | { |
0139418c | 6550 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 6551 | struct l2cap_chan *chan; |
1da177e4 | 6552 | |
0139418c | 6553 | if (!conn) |
1da177e4 | 6554 | return 0; |
0139418c | 6555 | |
89d8b407 | 6556 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 6557 | |
160dc6ac | 6558 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
6559 | if (!status && encrypt) |
6560 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 6561 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
6562 | } |
6563 | ||
3df91ea2 | 6564 | mutex_lock(&conn->chan_lock); |
1da177e4 | 6565 | |
3df91ea2 | 6566 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 6567 | l2cap_chan_lock(chan); |
1da177e4 | 6568 | |
89d8b407 AE |
6569 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
6570 | state_to_string(chan->state)); | |
f1cb9af5 | 6571 | |
78eb2f98 AE |
6572 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
6573 | l2cap_chan_unlock(chan); | |
6574 | continue; | |
6575 | } | |
6576 | ||
f1cb9af5 VCG |
6577 | if (chan->scid == L2CAP_CID_LE_DATA) { |
6578 | if (!status && encrypt) { | |
6579 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 6580 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
6581 | } |
6582 | ||
6be36555 | 6583 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
6584 | continue; |
6585 | } | |
6586 | ||
96eff46e | 6587 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 6588 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
6589 | continue; |
6590 | } | |
6591 | ||
89bc500e | 6592 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 6593 | chan->state == BT_CONFIG)) { |
a7d7723a GP |
6594 | struct sock *sk = chan->sk; |
6595 | ||
c5daa683 | 6596 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
6597 | sk->sk_state_change(sk); |
6598 | ||
4343478f | 6599 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 6600 | l2cap_chan_unlock(chan); |
9719f8af MH |
6601 | continue; |
6602 | } | |
6603 | ||
89bc500e | 6604 | if (chan->state == BT_CONNECT) { |
b1235d79 | 6605 | if (!status) { |
93c3e8f5 | 6606 | l2cap_start_connection(chan); |
b1235d79 | 6607 | } else { |
ba13ccd9 | 6608 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 6609 | } |
89bc500e | 6610 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 6611 | struct sock *sk = chan->sk; |
b1235d79 | 6612 | struct l2cap_conn_rsp rsp; |
df3c3931 | 6613 | __u16 res, stat; |
1da177e4 | 6614 | |
6be36555 AE |
6615 | lock_sock(sk); |
6616 | ||
b1235d79 | 6617 | if (!status) { |
c5daa683 GP |
6618 | if (test_bit(BT_SK_DEFER_SETUP, |
6619 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
6620 | res = L2CAP_CR_PEND; |
6621 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 6622 | chan->ops->defer(chan); |
df3c3931 | 6623 | } else { |
0e587be7 | 6624 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
6625 | res = L2CAP_CR_SUCCESS; |
6626 | stat = L2CAP_CS_NO_INFO; | |
6627 | } | |
b1235d79 | 6628 | } else { |
0e587be7 | 6629 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 6630 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
6631 | res = L2CAP_CR_SEC_BLOCK; |
6632 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
6633 | } |
6634 | ||
6be36555 AE |
6635 | release_sock(sk); |
6636 | ||
fe4128e0 GP |
6637 | rsp.scid = cpu_to_le16(chan->dcid); |
6638 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
6639 | rsp.result = cpu_to_le16(res); |
6640 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 6641 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 6642 | sizeof(rsp), &rsp); |
2d369359 MM |
6643 | |
6644 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
6645 | res == L2CAP_CR_SUCCESS) { | |
6646 | char buf[128]; | |
6647 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
6648 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
6649 | L2CAP_CONF_REQ, | |
6650 | l2cap_build_conf_req(chan, buf), | |
6651 | buf); | |
6652 | chan->num_conf_req++; | |
6653 | } | |
b1235d79 | 6654 | } |
1da177e4 | 6655 | |
6be36555 | 6656 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6657 | } |
6658 | ||
3df91ea2 | 6659 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 6660 | |
1da177e4 LT |
6661 | return 0; |
6662 | } | |
6663 | ||
686ebf28 | 6664 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
6665 | { |
6666 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
6667 | struct l2cap_hdr *hdr; |
6668 | int len; | |
1da177e4 | 6669 | |
1d13a254 AE |
6670 | /* For AMP controller do not create l2cap conn */ |
6671 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
6672 | goto drop; | |
1da177e4 | 6673 | |
5a08ecce | 6674 | if (!conn) |
baf43251 | 6675 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
6676 | |
6677 | if (!conn) | |
1da177e4 LT |
6678 | goto drop; |
6679 | ||
6680 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
6681 | ||
d73a0988 AE |
6682 | switch (flags) { |
6683 | case ACL_START: | |
6684 | case ACL_START_NO_FLUSH: | |
6685 | case ACL_COMPLETE: | |
1da177e4 LT |
6686 | if (conn->rx_len) { |
6687 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
6688 | kfree_skb(conn->rx_skb); | |
6689 | conn->rx_skb = NULL; | |
6690 | conn->rx_len = 0; | |
6691 | l2cap_conn_unreliable(conn, ECOMM); | |
6692 | } | |
6693 | ||
aae7fe22 AE |
6694 | /* Start fragment always begin with Basic L2CAP header */ |
6695 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
6696 | BT_ERR("Frame is too short (len %d)", skb->len); |
6697 | l2cap_conn_unreliable(conn, ECOMM); | |
6698 | goto drop; | |
6699 | } | |
6700 | ||
6701 | hdr = (struct l2cap_hdr *) skb->data; | |
6702 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
6703 | ||
6704 | if (len == skb->len) { | |
6705 | /* Complete frame received */ | |
6706 | l2cap_recv_frame(conn, skb); | |
6707 | return 0; | |
6708 | } | |
6709 | ||
6710 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
6711 | ||
6712 | if (skb->len > len) { | |
6713 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 6714 | skb->len, len); |
1da177e4 LT |
6715 | l2cap_conn_unreliable(conn, ECOMM); |
6716 | goto drop; | |
6717 | } | |
6718 | ||
6719 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 6720 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 6721 | if (!conn->rx_skb) |
1da177e4 LT |
6722 | goto drop; |
6723 | ||
d626f62b | 6724 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6725 | skb->len); |
1da177e4 | 6726 | conn->rx_len = len - skb->len; |
d73a0988 AE |
6727 | break; |
6728 | ||
6729 | case ACL_CONT: | |
1da177e4 LT |
6730 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
6731 | ||
6732 | if (!conn->rx_len) { | |
6733 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
6734 | l2cap_conn_unreliable(conn, ECOMM); | |
6735 | goto drop; | |
6736 | } | |
6737 | ||
6738 | if (skb->len > conn->rx_len) { | |
6739 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 6740 | skb->len, conn->rx_len); |
1da177e4 LT |
6741 | kfree_skb(conn->rx_skb); |
6742 | conn->rx_skb = NULL; | |
6743 | conn->rx_len = 0; | |
6744 | l2cap_conn_unreliable(conn, ECOMM); | |
6745 | goto drop; | |
6746 | } | |
6747 | ||
d626f62b | 6748 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6749 | skb->len); |
1da177e4 LT |
6750 | conn->rx_len -= skb->len; |
6751 | ||
6752 | if (!conn->rx_len) { | |
6753 | /* Complete frame received */ | |
6754 | l2cap_recv_frame(conn, conn->rx_skb); | |
6755 | conn->rx_skb = NULL; | |
6756 | } | |
d73a0988 | 6757 | break; |
1da177e4 LT |
6758 | } |
6759 | ||
6760 | drop: | |
6761 | kfree_skb(skb); | |
6762 | return 0; | |
6763 | } | |
6764 | ||
aef7d97c | 6765 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 6766 | { |
23691d75 | 6767 | struct l2cap_chan *c; |
1da177e4 | 6768 | |
333055f2 | 6769 | read_lock(&chan_list_lock); |
1da177e4 | 6770 | |
23691d75 GP |
6771 | list_for_each_entry(c, &chan_list, global_l) { |
6772 | struct sock *sk = c->sk; | |
101545f6 | 6773 | |
fcb73338 AE |
6774 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
6775 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
6776 | c->state, __le16_to_cpu(c->psm), | |
6777 | c->scid, c->dcid, c->imtu, c->omtu, | |
6778 | c->sec_level, c->mode); | |
61e1b4b7 | 6779 | } |
1da177e4 | 6780 | |
333055f2 | 6781 | read_unlock(&chan_list_lock); |
1da177e4 | 6782 | |
aef7d97c | 6783 | return 0; |
1da177e4 LT |
6784 | } |
6785 | ||
aef7d97c MH |
6786 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
6787 | { | |
6788 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
6789 | } | |
6790 | ||
6791 | static const struct file_operations l2cap_debugfs_fops = { | |
6792 | .open = l2cap_debugfs_open, | |
6793 | .read = seq_read, | |
6794 | .llseek = seq_lseek, | |
6795 | .release = single_release, | |
6796 | }; | |
6797 | ||
6798 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 6799 | |
64274518 | 6800 | int __init l2cap_init(void) |
1da177e4 LT |
6801 | { |
6802 | int err; | |
be9d1227 | 6803 | |
bb58f747 | 6804 | err = l2cap_init_sockets(); |
1da177e4 LT |
6805 | if (err < 0) |
6806 | return err; | |
6807 | ||
aef7d97c | 6808 | if (bt_debugfs) { |
2d792818 GP |
6809 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
6810 | NULL, &l2cap_debugfs_fops); | |
aef7d97c MH |
6811 | if (!l2cap_debugfs) |
6812 | BT_ERR("Failed to create L2CAP debug file"); | |
6813 | } | |
1da177e4 | 6814 | |
1da177e4 | 6815 | return 0; |
1da177e4 LT |
6816 | } |
6817 | ||
64274518 | 6818 | void l2cap_exit(void) |
1da177e4 | 6819 | { |
aef7d97c | 6820 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 6821 | l2cap_cleanup_sockets(); |
1da177e4 LT |
6822 | } |
6823 | ||
d1c4a17d GP |
6824 | module_param(disable_ertm, bool, 0644); |
6825 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |