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> |
1da177e4 | 41 | |
d1de6d46 | 42 | bool disable_ertm; |
f0709e03 | 43 | |
47ec1dcd | 44 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 45 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 46 | |
b5ad8b7f JB |
47 | static LIST_HEAD(chan_list); |
48 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 49 | |
1da177e4 LT |
50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
51 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
53 | void *data); | |
710f9b0a | 54 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 55 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 56 | struct l2cap_chan *chan, int err); |
1da177e4 | 57 | |
d660366d | 58 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
59 | struct sk_buff_head *skbs, u8 event); |
60 | ||
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
baa7e1fa | 63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 64 | { |
3df91ea2 | 65 | struct l2cap_chan *c; |
3d57dc68 | 66 | |
3df91ea2 AE |
67 | list_for_each_entry(c, &conn->chan_l, list) { |
68 | if (c->dcid == cid) | |
69 | return c; | |
0139418c | 70 | } |
3df91ea2 | 71 | return NULL; |
0139418c MH |
72 | } |
73 | ||
baa7e1fa | 74 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 75 | { |
3df91ea2 | 76 | struct l2cap_chan *c; |
3d57dc68 | 77 | |
3df91ea2 AE |
78 | list_for_each_entry(c, &conn->chan_l, list) { |
79 | if (c->scid == cid) | |
80 | return c; | |
0139418c | 81 | } |
3df91ea2 | 82 | return NULL; |
0139418c MH |
83 | } |
84 | ||
85 | /* Find channel with given SCID. | |
ef191ade | 86 | * Returns locked channel. */ |
baa7e1fa | 87 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 88 | { |
48454079 | 89 | struct l2cap_chan *c; |
baa7e1fa | 90 | |
3df91ea2 | 91 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 92 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
93 | if (c) |
94 | l2cap_chan_lock(c); | |
3df91ea2 AE |
95 | mutex_unlock(&conn->chan_lock); |
96 | ||
48454079 | 97 | return c; |
0139418c MH |
98 | } |
99 | ||
baa7e1fa | 100 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 101 | { |
3df91ea2 | 102 | struct l2cap_chan *c; |
3d57dc68 | 103 | |
3df91ea2 AE |
104 | list_for_each_entry(c, &conn->chan_l, list) { |
105 | if (c->ident == ident) | |
106 | return c; | |
0139418c | 107 | } |
3df91ea2 | 108 | return NULL; |
0139418c MH |
109 | } |
110 | ||
23691d75 | 111 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 112 | { |
23691d75 | 113 | struct l2cap_chan *c; |
9e4425ff | 114 | |
23691d75 GP |
115 | list_for_each_entry(c, &chan_list, global_l) { |
116 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 117 | return c; |
9e4425ff | 118 | } |
250938cb | 119 | return NULL; |
9e4425ff GP |
120 | } |
121 | ||
122 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
123 | { | |
73b2ec18 GP |
124 | int err; |
125 | ||
333055f2 | 126 | write_lock(&chan_list_lock); |
9e4425ff | 127 | |
23691d75 | 128 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
129 | err = -EADDRINUSE; |
130 | goto done; | |
9e4425ff GP |
131 | } |
132 | ||
73b2ec18 GP |
133 | if (psm) { |
134 | chan->psm = psm; | |
135 | chan->sport = psm; | |
136 | err = 0; | |
137 | } else { | |
138 | u16 p; | |
139 | ||
140 | err = -EINVAL; | |
141 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 142 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
143 | chan->psm = cpu_to_le16(p); |
144 | chan->sport = cpu_to_le16(p); | |
145 | err = 0; | |
146 | break; | |
147 | } | |
148 | } | |
9e4425ff | 149 | |
73b2ec18 | 150 | done: |
333055f2 | 151 | write_unlock(&chan_list_lock); |
73b2ec18 | 152 | return err; |
9e4425ff GP |
153 | } |
154 | ||
155 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
156 | { | |
333055f2 | 157 | write_lock(&chan_list_lock); |
9e4425ff GP |
158 | |
159 | chan->scid = scid; | |
160 | ||
333055f2 | 161 | write_unlock(&chan_list_lock); |
9e4425ff GP |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
baa7e1fa | 166 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 167 | { |
8db4dc46 | 168 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 169 | |
8db4dc46 | 170 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 171 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
172 | return cid; |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
0e587be7 | 178 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 179 | { |
42d2d87c | 180 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
181 | state_to_string(state)); |
182 | ||
89bc500e | 183 | chan->state = state; |
80b98027 | 184 | chan->ops->state_change(chan, state); |
89bc500e GP |
185 | } |
186 | ||
0e587be7 AE |
187 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
188 | { | |
189 | struct sock *sk = chan->sk; | |
190 | ||
191 | lock_sock(sk); | |
192 | __l2cap_state_change(chan, state); | |
193 | release_sock(sk); | |
194 | } | |
195 | ||
2e0052e4 AE |
196 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
197 | { | |
198 | struct sock *sk = chan->sk; | |
199 | ||
200 | sk->sk_err = err; | |
201 | } | |
202 | ||
203 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
204 | { | |
205 | struct sock *sk = chan->sk; | |
206 | ||
207 | lock_sock(sk); | |
208 | __l2cap_chan_set_err(chan, err); | |
209 | release_sock(sk); | |
210 | } | |
211 | ||
4239d16f MM |
212 | static void __set_retrans_timer(struct l2cap_chan *chan) |
213 | { | |
214 | if (!delayed_work_pending(&chan->monitor_timer) && | |
215 | chan->retrans_timeout) { | |
216 | l2cap_set_timer(chan, &chan->retrans_timer, | |
217 | msecs_to_jiffies(chan->retrans_timeout)); | |
218 | } | |
219 | } | |
220 | ||
221 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
222 | { | |
223 | __clear_retrans_timer(chan); | |
224 | if (chan->monitor_timeout) { | |
225 | l2cap_set_timer(chan, &chan->monitor_timer, | |
226 | msecs_to_jiffies(chan->monitor_timeout)); | |
227 | } | |
228 | } | |
229 | ||
608bcc6d MM |
230 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
231 | u16 seq) | |
232 | { | |
233 | struct sk_buff *skb; | |
234 | ||
235 | skb_queue_walk(head, skb) { | |
236 | if (bt_cb(skb)->control.txseq == seq) | |
237 | return skb; | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
3c588192 MM |
243 | /* ---- L2CAP sequence number lists ---- */ |
244 | ||
245 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
246 | * SREJ requests that are received and for frames that are to be | |
247 | * retransmitted. These seq_list functions implement a singly-linked | |
248 | * list in an array, where membership in the list can also be checked | |
249 | * in constant time. Items can also be added to the tail of the list | |
250 | * and removed from the head in constant time, without further memory | |
251 | * allocs or frees. | |
252 | */ | |
253 | ||
254 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
255 | { | |
256 | size_t alloc_size, i; | |
257 | ||
258 | /* Allocated size is a power of 2 to map sequence numbers | |
259 | * (which may be up to 14 bits) in to a smaller array that is | |
260 | * sized for the negotiated ERTM transmit windows. | |
261 | */ | |
262 | alloc_size = roundup_pow_of_two(size); | |
263 | ||
264 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
265 | if (!seq_list->list) | |
266 | return -ENOMEM; | |
267 | ||
268 | seq_list->mask = alloc_size - 1; | |
269 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
270 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
271 | for (i = 0; i < alloc_size; i++) | |
272 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
278 | { | |
279 | kfree(seq_list->list); | |
280 | } | |
281 | ||
282 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
283 | u16 seq) | |
284 | { | |
285 | /* Constant-time check for list membership */ | |
286 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
287 | } | |
288 | ||
289 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
290 | { | |
291 | u16 mask = seq_list->mask; | |
292 | ||
293 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
294 | /* In case someone tries to pop the head of an empty list */ | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } else if (seq_list->head == seq) { | |
297 | /* Head can be removed in constant time */ | |
298 | seq_list->head = seq_list->list[seq & mask]; | |
299 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
300 | ||
301 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
302 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
303 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
304 | } | |
305 | } else { | |
306 | /* Walk the list to find the sequence number */ | |
307 | u16 prev = seq_list->head; | |
308 | while (seq_list->list[prev & mask] != seq) { | |
309 | prev = seq_list->list[prev & mask]; | |
310 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
311 | return L2CAP_SEQ_LIST_CLEAR; | |
312 | } | |
313 | ||
314 | /* Unlink the number from the list and clear it */ | |
315 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
316 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
317 | if (seq_list->tail == seq) | |
318 | seq_list->tail = prev; | |
319 | } | |
320 | return seq; | |
321 | } | |
322 | ||
323 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | /* Remove the head in constant time */ | |
326 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
327 | } | |
328 | ||
329 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
330 | { | |
f522ae36 | 331 | u16 i; |
3c588192 | 332 | |
f522ae36 GP |
333 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
335 | ||
336 | for (i = 0; i <= seq_list->mask; i++) | |
337 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
338 | ||
339 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
340 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
341 | } |
342 | ||
343 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
344 | { | |
345 | u16 mask = seq_list->mask; | |
346 | ||
347 | /* All appends happen in constant time */ | |
348 | ||
f522ae36 GP |
349 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
350 | return; | |
3c588192 | 351 | |
f522ae36 GP |
352 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
353 | seq_list->head = seq; | |
354 | else | |
355 | seq_list->list[seq_list->tail & mask] = seq; | |
356 | ||
357 | seq_list->tail = seq; | |
358 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
359 | } |
360 | ||
721c4181 | 361 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 362 | { |
721c4181 GP |
363 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
364 | chan_timer.work); | |
3df91ea2 | 365 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
366 | int reason; |
367 | ||
e05dcc32 | 368 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 369 | |
3df91ea2 | 370 | mutex_lock(&conn->chan_lock); |
6be36555 | 371 | l2cap_chan_lock(chan); |
ab07801d | 372 | |
89bc500e | 373 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 374 | reason = ECONNREFUSED; |
89bc500e | 375 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
376 | chan->sec_level != BT_SECURITY_SDP) |
377 | reason = ECONNREFUSED; | |
378 | else | |
379 | reason = ETIMEDOUT; | |
380 | ||
0f852724 | 381 | l2cap_chan_close(chan, reason); |
ab07801d | 382 | |
6be36555 | 383 | l2cap_chan_unlock(chan); |
ab07801d | 384 | |
80b98027 | 385 | chan->ops->close(chan); |
3df91ea2 AE |
386 | mutex_unlock(&conn->chan_lock); |
387 | ||
371fd835 | 388 | l2cap_chan_put(chan); |
ab07801d GP |
389 | } |
390 | ||
eef1d9b6 | 391 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
392 | { |
393 | struct l2cap_chan *chan; | |
394 | ||
395 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
396 | if (!chan) | |
397 | return NULL; | |
398 | ||
c03b355e AE |
399 | mutex_init(&chan->lock); |
400 | ||
333055f2 | 401 | write_lock(&chan_list_lock); |
23691d75 | 402 | list_add(&chan->global_l, &chan_list); |
333055f2 | 403 | write_unlock(&chan_list_lock); |
23691d75 | 404 | |
721c4181 | 405 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 406 | |
89bc500e GP |
407 | chan->state = BT_OPEN; |
408 | ||
144ad330 | 409 | kref_init(&chan->kref); |
71ba0e56 | 410 | |
2827011f MM |
411 | /* This flag is cleared in l2cap_chan_ready() */ |
412 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
413 | ||
eef1d9b6 | 414 | BT_DBG("chan %p", chan); |
abc545b8 | 415 | |
48454079 GP |
416 | return chan; |
417 | } | |
418 | ||
144ad330 | 419 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 420 | { |
144ad330 SS |
421 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
422 | ||
4af66c69 JK |
423 | BT_DBG("chan %p", chan); |
424 | ||
333055f2 | 425 | write_lock(&chan_list_lock); |
23691d75 | 426 | list_del(&chan->global_l); |
333055f2 | 427 | write_unlock(&chan_list_lock); |
23691d75 | 428 | |
4af66c69 | 429 | kfree(chan); |
6ff5abbf GP |
430 | } |
431 | ||
30648372 JK |
432 | void l2cap_chan_hold(struct l2cap_chan *c) |
433 | { | |
144ad330 | 434 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 435 | |
144ad330 | 436 | kref_get(&c->kref); |
30648372 JK |
437 | } |
438 | ||
439 | void l2cap_chan_put(struct l2cap_chan *c) | |
440 | { | |
144ad330 | 441 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 442 | |
144ad330 | 443 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
444 | } |
445 | ||
bd4b1653 AE |
446 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
447 | { | |
448 | chan->fcs = L2CAP_FCS_CRC16; | |
449 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
450 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
451 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 452 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
453 | chan->sec_level = BT_SECURITY_LOW; |
454 | ||
455 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
456 | } | |
457 | ||
93c3e8f5 | 458 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 459 | { |
af05b30b | 460 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 461 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 462 | |
9f5a0d7b | 463 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 464 | |
8c1d787b | 465 | chan->conn = conn; |
0139418c | 466 | |
5491120e AE |
467 | switch (chan->chan_type) { |
468 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
469 | if (conn->hcon->type == LE_LINK) { |
470 | /* LE connection */ | |
6fcb06a2 | 471 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
472 | chan->scid = L2CAP_CID_LE_DATA; |
473 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
474 | } else { |
475 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 476 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 477 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 478 | } |
5491120e AE |
479 | break; |
480 | ||
481 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 482 | /* Connectionless socket */ |
fe4128e0 GP |
483 | chan->scid = L2CAP_CID_CONN_LESS; |
484 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 485 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
486 | break; |
487 | ||
416fa752 AE |
488 | case L2CAP_CHAN_CONN_FIX_A2MP: |
489 | chan->scid = L2CAP_CID_A2MP; | |
490 | chan->dcid = L2CAP_CID_A2MP; | |
491 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
492 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
493 | break; | |
494 | ||
5491120e | 495 | default: |
0139418c | 496 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
497 | chan->scid = L2CAP_CID_SIGNALING; |
498 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 499 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
500 | } |
501 | ||
8f7975b1 AE |
502 | chan->local_id = L2CAP_BESTEFFORT_ID; |
503 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
504 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
505 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
506 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 507 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 508 | |
371fd835 | 509 | l2cap_chan_hold(chan); |
baa7e1fa | 510 | |
3df91ea2 | 511 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
512 | } |
513 | ||
466f8004 | 514 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
515 | { |
516 | mutex_lock(&conn->chan_lock); | |
517 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 518 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
519 | } |
520 | ||
466f8004 | 521 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 522 | { |
8c1d787b | 523 | struct l2cap_conn *conn = chan->conn; |
0139418c | 524 | |
c9b66675 | 525 | __clear_chan_timer(chan); |
0139418c | 526 | |
49208c9c | 527 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 528 | |
8e87d142 | 529 | if (conn) { |
baa7e1fa | 530 | /* Delete from channel list */ |
3df91ea2 | 531 | list_del(&chan->list); |
3d57dc68 | 532 | |
371fd835 | 533 | l2cap_chan_put(chan); |
baa7e1fa | 534 | |
8c1d787b | 535 | chan->conn = NULL; |
3cabbfda AE |
536 | |
537 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
538 | hci_conn_put(conn->hcon); | |
0139418c MH |
539 | } |
540 | ||
c0df7f6e AE |
541 | if (chan->ops->teardown) |
542 | chan->ops->teardown(chan, err); | |
6be36555 | 543 | |
2827011f | 544 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 545 | return; |
2ead70b8 | 546 | |
ee556f66 GP |
547 | switch(chan->mode) { |
548 | case L2CAP_MODE_BASIC: | |
549 | break; | |
c13ffa62 | 550 | |
ee556f66 | 551 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
552 | __clear_retrans_timer(chan); |
553 | __clear_monitor_timer(chan); | |
554 | __clear_ack_timer(chan); | |
c13ffa62 | 555 | |
f1c6775b | 556 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 557 | |
3c588192 MM |
558 | l2cap_seq_list_free(&chan->srej_list); |
559 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
560 | |
561 | /* fall through */ | |
562 | ||
563 | case L2CAP_MODE_STREAMING: | |
564 | skb_queue_purge(&chan->tx_q); | |
565 | break; | |
c13ffa62 | 566 | } |
ee556f66 GP |
567 | |
568 | return; | |
0139418c MH |
569 | } |
570 | ||
0f852724 | 571 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
572 | { |
573 | struct l2cap_conn *conn = chan->conn; | |
574 | struct sock *sk = chan->sk; | |
575 | ||
e05dcc32 AE |
576 | BT_DBG("chan %p state %s sk %p", chan, |
577 | state_to_string(chan->state), sk); | |
4519de9a | 578 | |
89bc500e | 579 | switch (chan->state) { |
4519de9a | 580 | case BT_LISTEN: |
c0df7f6e AE |
581 | if (chan->ops->teardown) |
582 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
583 | break; |
584 | ||
585 | case BT_CONNECTED: | |
586 | case BT_CONFIG: | |
715ec005 | 587 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 588 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 589 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
590 | l2cap_send_disconn_req(conn, chan, reason); |
591 | } else | |
592 | l2cap_chan_del(chan, reason); | |
593 | break; | |
594 | ||
595 | case BT_CONNECT2: | |
715ec005 | 596 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
597 | conn->hcon->type == ACL_LINK) { |
598 | struct l2cap_conn_rsp rsp; | |
599 | __u16 result; | |
600 | ||
c5daa683 | 601 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
602 | result = L2CAP_CR_SEC_BLOCK; |
603 | else | |
604 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 605 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
606 | |
607 | rsp.scid = cpu_to_le16(chan->dcid); | |
608 | rsp.dcid = cpu_to_le16(chan->scid); | |
609 | rsp.result = cpu_to_le16(result); | |
ac73498c | 610 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
611 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
612 | sizeof(rsp), &rsp); | |
613 | } | |
614 | ||
615 | l2cap_chan_del(chan, reason); | |
616 | break; | |
617 | ||
618 | case BT_CONNECT: | |
619 | case BT_DISCONN: | |
620 | l2cap_chan_del(chan, reason); | |
621 | break; | |
622 | ||
623 | default: | |
c0df7f6e AE |
624 | if (chan->ops->teardown) |
625 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
626 | break; |
627 | } | |
628 | } | |
629 | ||
4343478f | 630 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 631 | { |
715ec005 | 632 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 633 | switch (chan->sec_level) { |
8556edd3 JH |
634 | case BT_SECURITY_HIGH: |
635 | return HCI_AT_DEDICATED_BONDING_MITM; | |
636 | case BT_SECURITY_MEDIUM: | |
637 | return HCI_AT_DEDICATED_BONDING; | |
638 | default: | |
639 | return HCI_AT_NO_BONDING; | |
640 | } | |
2983fd68 | 641 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
642 | if (chan->sec_level == BT_SECURITY_LOW) |
643 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 644 | |
4343478f | 645 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 646 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 647 | else |
8556edd3 | 648 | return HCI_AT_NO_BONDING; |
00ae4af9 | 649 | } else { |
4343478f | 650 | switch (chan->sec_level) { |
00ae4af9 | 651 | case BT_SECURITY_HIGH: |
8556edd3 | 652 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 653 | case BT_SECURITY_MEDIUM: |
8556edd3 | 654 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 655 | default: |
8556edd3 | 656 | return HCI_AT_NO_BONDING; |
00ae4af9 | 657 | } |
0684e5f9 | 658 | } |
8556edd3 JH |
659 | } |
660 | ||
661 | /* Service level security */ | |
d45fc423 | 662 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 663 | { |
8c1d787b | 664 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
665 | __u8 auth_type; |
666 | ||
4343478f | 667 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 668 | |
4343478f | 669 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
670 | } |
671 | ||
b5ad8b7f | 672 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
673 | { |
674 | u8 id; | |
675 | ||
676 | /* Get next available identificator. | |
677 | * 1 - 128 are used by kernel. | |
678 | * 129 - 199 are reserved. | |
679 | * 200 - 254 are used by utilities like l2ping, etc. | |
680 | */ | |
681 | ||
333055f2 | 682 | spin_lock(&conn->lock); |
4e8402a3 MH |
683 | |
684 | if (++conn->tx_ident > 128) | |
685 | conn->tx_ident = 1; | |
686 | ||
687 | id = conn->tx_ident; | |
688 | ||
333055f2 | 689 | spin_unlock(&conn->lock); |
4e8402a3 MH |
690 | |
691 | return id; | |
692 | } | |
693 | ||
4519de9a | 694 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
695 | { |
696 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 697 | u8 flags; |
4e8402a3 MH |
698 | |
699 | BT_DBG("code 0x%2.2x", code); | |
700 | ||
701 | if (!skb) | |
9a9c6a34 | 702 | return; |
4e8402a3 | 703 | |
e702112f AE |
704 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
705 | flags = ACL_START_NO_FLUSH; | |
706 | else | |
707 | flags = ACL_START; | |
708 | ||
14b12d0b | 709 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 710 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 711 | |
73d80deb LAD |
712 | hci_send_acl(conn->hchan, skb, flags); |
713 | } | |
714 | ||
715 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
716 | { | |
717 | struct hci_conn *hcon = chan->conn->hcon; | |
718 | u16 flags; | |
719 | ||
720 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
721 | skb->priority); | |
722 | ||
723 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
724 | lmp_no_flush_capable(hcon->hdev)) | |
725 | flags = ACL_START_NO_FLUSH; | |
726 | else | |
727 | flags = ACL_START; | |
14b12d0b | 728 | |
73d80deb LAD |
729 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
730 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
731 | } |
732 | ||
b76bbd66 MM |
733 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
734 | { | |
735 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
736 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
737 | ||
738 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
739 | /* S-Frame */ | |
740 | control->sframe = 1; | |
741 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
742 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
743 | ||
744 | control->sar = 0; | |
745 | control->txseq = 0; | |
746 | } else { | |
747 | /* I-Frame */ | |
748 | control->sframe = 0; | |
749 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
750 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
751 | ||
752 | control->poll = 0; | |
753 | control->super = 0; | |
754 | } | |
755 | } | |
756 | ||
b76bbd66 MM |
757 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
758 | { | |
759 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
760 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
761 | ||
762 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
763 | /* S-Frame */ | |
764 | control->sframe = 1; | |
765 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
766 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
767 | ||
768 | control->sar = 0; | |
769 | control->txseq = 0; | |
770 | } else { | |
771 | /* I-Frame */ | |
772 | control->sframe = 0; | |
773 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
774 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
775 | ||
776 | control->poll = 0; | |
777 | control->super = 0; | |
778 | } | |
779 | } | |
780 | ||
781 | static inline void __unpack_control(struct l2cap_chan *chan, | |
782 | struct sk_buff *skb) | |
783 | { | |
784 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
785 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
786 | &bt_cb(skb)->control); | |
cec8ab6e | 787 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
788 | } else { |
789 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
790 | &bt_cb(skb)->control); | |
cec8ab6e | 791 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
792 | } |
793 | } | |
794 | ||
b5c6aaed MM |
795 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
796 | { | |
797 | u32 packed; | |
798 | ||
799 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
800 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
801 | ||
802 | if (control->sframe) { | |
803 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
804 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
805 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
806 | } else { | |
807 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
808 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
809 | } | |
810 | ||
811 | return packed; | |
812 | } | |
813 | ||
814 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
815 | { | |
816 | u16 packed; | |
817 | ||
818 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
819 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
820 | ||
821 | if (control->sframe) { | |
822 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
823 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
824 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
825 | } else { | |
826 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
827 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
828 | } | |
829 | ||
830 | return packed; | |
831 | } | |
832 | ||
b76bbd66 MM |
833 | static inline void __pack_control(struct l2cap_chan *chan, |
834 | struct l2cap_ctrl *control, | |
835 | struct sk_buff *skb) | |
836 | { | |
837 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
838 | put_unaligned_le32(__pack_extended_control(control), | |
839 | skb->data + L2CAP_HDR_SIZE); | |
840 | } else { | |
841 | put_unaligned_le16(__pack_enhanced_control(control), | |
842 | skb->data + L2CAP_HDR_SIZE); | |
843 | } | |
844 | } | |
845 | ||
ba7aa64f GP |
846 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
847 | { | |
848 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
849 | return L2CAP_EXT_HDR_SIZE; | |
850 | else | |
851 | return L2CAP_ENH_HDR_SIZE; | |
852 | } | |
853 | ||
a67d7f6f MM |
854 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
855 | u32 control) | |
b5c6aaed MM |
856 | { |
857 | struct sk_buff *skb; | |
858 | struct l2cap_hdr *lh; | |
ba7aa64f | 859 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
860 | |
861 | if (chan->fcs == L2CAP_FCS_CRC16) | |
862 | hlen += L2CAP_FCS_SIZE; | |
863 | ||
a67d7f6f | 864 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 865 | |
b5c6aaed | 866 | if (!skb) |
a67d7f6f | 867 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
868 | |
869 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
870 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
871 | lh->cid = cpu_to_le16(chan->dcid); | |
872 | ||
a67d7f6f MM |
873 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
874 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
875 | else | |
876 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
877 | |
878 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 879 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
880 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
881 | } | |
882 | ||
883 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
884 | return skb; |
885 | } | |
886 | ||
887 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
888 | struct l2cap_ctrl *control) | |
889 | { | |
890 | struct sk_buff *skb; | |
891 | u32 control_field; | |
892 | ||
893 | BT_DBG("chan %p, control %p", chan, control); | |
894 | ||
895 | if (!control->sframe) | |
896 | return; | |
897 | ||
898 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
899 | !control->poll) | |
900 | control->final = 1; | |
901 | ||
902 | if (control->super == L2CAP_SUPER_RR) | |
903 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
904 | else if (control->super == L2CAP_SUPER_RNR) | |
905 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
906 | ||
907 | if (control->super != L2CAP_SUPER_SREJ) { | |
908 | chan->last_acked_seq = control->reqseq; | |
909 | __clear_ack_timer(chan); | |
910 | } | |
911 | ||
912 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
913 | control->final, control->poll, control->super); | |
914 | ||
915 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
916 | control_field = __pack_extended_control(control); | |
917 | else | |
918 | control_field = __pack_enhanced_control(control); | |
919 | ||
920 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
921 | if (!IS_ERR(skb)) | |
922 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
923 | } |
924 | ||
c9e3d5e0 | 925 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 926 | { |
c9e3d5e0 MM |
927 | struct l2cap_ctrl control; |
928 | ||
929 | BT_DBG("chan %p, poll %d", chan, poll); | |
930 | ||
931 | memset(&control, 0, sizeof(control)); | |
932 | control.sframe = 1; | |
933 | control.poll = poll; | |
934 | ||
935 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
936 | control.super = L2CAP_SUPER_RNR; | |
937 | else | |
938 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 939 | |
c9e3d5e0 MM |
940 | control.reqseq = chan->buffer_seq; |
941 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
942 | } |
943 | ||
b4450035 | 944 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 945 | { |
c1360a1c | 946 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
947 | } |
948 | ||
93c3e8f5 AE |
949 | static bool __amp_capable(struct l2cap_chan *chan) |
950 | { | |
951 | struct l2cap_conn *conn = chan->conn; | |
952 | ||
953 | if (enable_hs && | |
954 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && | |
955 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
956 | return true; | |
957 | else | |
958 | return false; | |
959 | } | |
960 | ||
2766be48 | 961 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
962 | { |
963 | struct l2cap_conn *conn = chan->conn; | |
964 | struct l2cap_conn_req req; | |
965 | ||
966 | req.scid = cpu_to_le16(chan->scid); | |
967 | req.psm = chan->psm; | |
968 | ||
969 | chan->ident = l2cap_get_ident(conn); | |
970 | ||
971 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
972 | ||
973 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
974 | } | |
975 | ||
9f0caeb1 VCG |
976 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
977 | { | |
2827011f | 978 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
979 | chan->conf_state = 0; |
980 | __clear_chan_timer(chan); | |
981 | ||
54a59aa2 | 982 | chan->state = BT_CONNECTED; |
9f0caeb1 | 983 | |
fd83e2c2 | 984 | chan->ops->ready(chan); |
9f0caeb1 VCG |
985 | } |
986 | ||
93c3e8f5 AE |
987 | static void l2cap_start_connection(struct l2cap_chan *chan) |
988 | { | |
989 | if (__amp_capable(chan)) { | |
990 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
991 | a2mp_discover_amp(chan); | |
992 | } else { | |
993 | l2cap_send_conn_req(chan); | |
994 | } | |
995 | } | |
996 | ||
fc7f8a7e | 997 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 998 | { |
8c1d787b | 999 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1000 | |
9f0caeb1 VCG |
1001 | if (conn->hcon->type == LE_LINK) { |
1002 | l2cap_chan_ready(chan); | |
1003 | return; | |
1004 | } | |
1005 | ||
79d554a6 | 1006 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1007 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1008 | return; | |
1009 | ||
d45fc423 | 1010 | if (l2cap_chan_check_security(chan) && |
93c3e8f5 AE |
1011 | __l2cap_no_conn_pending(chan)) { |
1012 | l2cap_start_connection(chan); | |
1013 | } | |
79d554a6 MH |
1014 | } else { |
1015 | struct l2cap_info_req req; | |
ac73498c | 1016 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1017 | |
1018 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1019 | conn->info_ident = l2cap_get_ident(conn); | |
1020 | ||
ba13ccd9 | 1021 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
1022 | |
1023 | l2cap_send_cmd(conn, conn->info_ident, | |
1024 | L2CAP_INFO_REQ, sizeof(req), &req); | |
1025 | } | |
1026 | } | |
1027 | ||
cf6c2c0b GP |
1028 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1029 | { | |
1030 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1031 | if (!disable_ertm) |
cf6c2c0b GP |
1032 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1033 | ||
1034 | switch (mode) { | |
1035 | case L2CAP_MODE_ERTM: | |
1036 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1037 | case L2CAP_MODE_STREAMING: | |
1038 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1039 | default: | |
1040 | return 0x00; | |
1041 | } | |
1042 | } | |
1043 | ||
4519de9a | 1044 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1045 | { |
6be36555 | 1046 | struct sock *sk = chan->sk; |
22121fc9 GP |
1047 | struct l2cap_disconn_req req; |
1048 | ||
c13ffa62 GP |
1049 | if (!conn) |
1050 | return; | |
1051 | ||
0c1bc5c6 | 1052 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1053 | __clear_retrans_timer(chan); |
1054 | __clear_monitor_timer(chan); | |
1055 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1056 | } |
1057 | ||
416fa752 AE |
1058 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1059 | __l2cap_state_change(chan, BT_DISCONN); | |
1060 | return; | |
1061 | } | |
1062 | ||
fe4128e0 GP |
1063 | req.dcid = cpu_to_le16(chan->dcid); |
1064 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1065 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1066 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1067 | |
6be36555 | 1068 | lock_sock(sk); |
0e587be7 | 1069 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1070 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1071 | release_sock(sk); |
22121fc9 GP |
1072 | } |
1073 | ||
1da177e4 | 1074 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1075 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1076 | { | |
3df91ea2 | 1077 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1078 | |
1079 | BT_DBG("conn %p", conn); | |
1080 | ||
3df91ea2 | 1081 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1082 | |
3df91ea2 | 1083 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1084 | struct sock *sk = chan->sk; |
baa7e1fa | 1085 | |
6be36555 | 1086 | l2cap_chan_lock(chan); |
4e8402a3 | 1087 | |
715ec005 | 1088 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1089 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1090 | continue; |
1091 | } | |
1092 | ||
89bc500e | 1093 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1094 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1095 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1096 | l2cap_chan_unlock(chan); |
47731de7 GP |
1097 | continue; |
1098 | } | |
79d554a6 | 1099 | |
c1360a1c GP |
1100 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1101 | && test_bit(CONF_STATE2_DEVICE, | |
1102 | &chan->conf_state)) { | |
89bc500e | 1103 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1104 | l2cap_chan_unlock(chan); |
47731de7 | 1105 | continue; |
b1235d79 | 1106 | } |
47731de7 | 1107 | |
93c3e8f5 | 1108 | l2cap_start_connection(chan); |
47731de7 | 1109 | |
89bc500e | 1110 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1111 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1112 | char buf[128]; |
fe4128e0 GP |
1113 | rsp.scid = cpu_to_le16(chan->dcid); |
1114 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1115 | |
d45fc423 | 1116 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1117 | lock_sock(sk); |
c5daa683 GP |
1118 | if (test_bit(BT_SK_DEFER_SETUP, |
1119 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1120 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1121 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1122 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1123 | if (parent) |
1124 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1125 | |
1126 | } else { | |
0e587be7 | 1127 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1128 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1129 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1130 | } |
6be36555 | 1131 | release_sock(sk); |
79d554a6 | 1132 | } else { |
ac73498c AE |
1133 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1134 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1135 | } |
1136 | ||
fc7f8a7e GP |
1137 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1138 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1139 | |
c1360a1c | 1140 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1141 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1142 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1143 | continue; |
1144 | } | |
1145 | ||
c1360a1c | 1146 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1147 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1148 | l2cap_build_conf_req(chan, buf), buf); |
1149 | chan->num_conf_req++; | |
4e8402a3 MH |
1150 | } |
1151 | ||
6be36555 | 1152 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1153 | } |
1154 | ||
3df91ea2 | 1155 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1156 | } |
1157 | ||
c2287681 | 1158 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1159 | * Returns closest match, locked. |
1160 | */ | |
d9b88702 | 1161 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1162 | bdaddr_t *src, |
1163 | bdaddr_t *dst) | |
b62f328b | 1164 | { |
23691d75 | 1165 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1166 | |
23691d75 | 1167 | read_lock(&chan_list_lock); |
b62f328b | 1168 | |
23691d75 GP |
1169 | list_for_each_entry(c, &chan_list, global_l) { |
1170 | struct sock *sk = c->sk; | |
fe4128e0 | 1171 | |
89bc500e | 1172 | if (state && c->state != state) |
b62f328b VT |
1173 | continue; |
1174 | ||
23691d75 | 1175 | if (c->scid == cid) { |
c2287681 IY |
1176 | int src_match, dst_match; |
1177 | int src_any, dst_any; | |
1178 | ||
b62f328b | 1179 | /* Exact match. */ |
c2287681 IY |
1180 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1181 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1182 | if (src_match && dst_match) { | |
23691d75 GP |
1183 | read_unlock(&chan_list_lock); |
1184 | return c; | |
1185 | } | |
b62f328b VT |
1186 | |
1187 | /* Closest match */ | |
c2287681 IY |
1188 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1189 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1190 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1191 | (src_any && dst_any)) | |
23691d75 | 1192 | c1 = c; |
b62f328b VT |
1193 | } |
1194 | } | |
280f294f | 1195 | |
23691d75 | 1196 | read_unlock(&chan_list_lock); |
b62f328b | 1197 | |
23691d75 | 1198 | return c1; |
b62f328b VT |
1199 | } |
1200 | ||
1201 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1202 | { | |
c916fbe4 | 1203 | struct sock *parent, *sk; |
23691d75 | 1204 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1205 | |
1206 | BT_DBG(""); | |
1207 | ||
1208 | /* Check if we have socket listening on cid */ | |
23691d75 | 1209 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1210 | conn->src, conn->dst); |
23691d75 | 1211 | if (!pchan) |
b62f328b VT |
1212 | return; |
1213 | ||
23691d75 GP |
1214 | parent = pchan->sk; |
1215 | ||
aa2ac881 | 1216 | lock_sock(parent); |
62f3a2cf | 1217 | |
80b98027 | 1218 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1219 | if (!chan) |
b62f328b VT |
1220 | goto clean; |
1221 | ||
80808e43 | 1222 | sk = chan->sk; |
5d41ce1d | 1223 | |
b62f328b | 1224 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1225 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1226 | |
b62f328b VT |
1227 | bacpy(&bt_sk(sk)->src, conn->src); |
1228 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1229 | ||
d1010240 GP |
1230 | bt_accept_enqueue(parent, sk); |
1231 | ||
3d57dc68 | 1232 | l2cap_chan_add(conn, chan); |
48454079 | 1233 | |
6754e0df | 1234 | l2cap_chan_ready(chan); |
b62f328b | 1235 | |
b62f328b | 1236 | clean: |
aa2ac881 | 1237 | release_sock(parent); |
b62f328b VT |
1238 | } |
1239 | ||
4e8402a3 MH |
1240 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1241 | { | |
48454079 | 1242 | struct l2cap_chan *chan; |
cc110922 | 1243 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1244 | |
79d554a6 | 1245 | BT_DBG("conn %p", conn); |
4e8402a3 | 1246 | |
cc110922 | 1247 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1248 | l2cap_le_conn_ready(conn); |
1249 | ||
cc110922 VCG |
1250 | if (hcon->out && hcon->type == LE_LINK) |
1251 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1252 | |
3df91ea2 | 1253 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1254 | |
3df91ea2 | 1255 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1256 | |
6be36555 | 1257 | l2cap_chan_lock(chan); |
4e8402a3 | 1258 | |
416fa752 AE |
1259 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1260 | l2cap_chan_unlock(chan); | |
1261 | continue; | |
1262 | } | |
1263 | ||
cc110922 VCG |
1264 | if (hcon->type == LE_LINK) { |
1265 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1266 | l2cap_chan_ready(chan); |
acd7d370 | 1267 | |
63128451 | 1268 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1269 | struct sock *sk = chan->sk; |
c9b66675 | 1270 | __clear_chan_timer(chan); |
6be36555 | 1271 | lock_sock(sk); |
0e587be7 | 1272 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1273 | sk->sk_state_change(sk); |
6be36555 | 1274 | release_sock(sk); |
b501d6a1 | 1275 | |
89bc500e | 1276 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1277 | l2cap_do_start(chan); |
4e8402a3 | 1278 | |
6be36555 | 1279 | l2cap_chan_unlock(chan); |
4e8402a3 | 1280 | } |
79d554a6 | 1281 | |
3df91ea2 | 1282 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1283 | } |
1284 | ||
1285 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1286 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1287 | { | |
48454079 | 1288 | struct l2cap_chan *chan; |
4e8402a3 MH |
1289 | |
1290 | BT_DBG("conn %p", conn); | |
1291 | ||
3df91ea2 | 1292 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1293 | |
3df91ea2 | 1294 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1295 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1296 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1297 | } |
1298 | ||
3df91ea2 | 1299 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1300 | } |
1301 | ||
f878fcad | 1302 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1303 | { |
f878fcad | 1304 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1305 | info_timer.work); |
4e8402a3 | 1306 | |
984947dc | 1307 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1308 | conn->info_ident = 0; |
984947dc | 1309 | |
4e8402a3 MH |
1310 | l2cap_conn_start(conn); |
1311 | } | |
1312 | ||
5d3de7df VCG |
1313 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1314 | { | |
1315 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1316 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1317 | |
1318 | if (!conn) | |
1319 | return; | |
1320 | ||
1321 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1322 | ||
1323 | kfree_skb(conn->rx_skb); | |
1324 | ||
3df91ea2 AE |
1325 | mutex_lock(&conn->chan_lock); |
1326 | ||
5d3de7df VCG |
1327 | /* Kill channels */ |
1328 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1329 | l2cap_chan_hold(chan); |
6be36555 AE |
1330 | l2cap_chan_lock(chan); |
1331 | ||
5d3de7df | 1332 | l2cap_chan_del(chan, err); |
6be36555 AE |
1333 | |
1334 | l2cap_chan_unlock(chan); | |
1335 | ||
80b98027 | 1336 | chan->ops->close(chan); |
61d6ef3e | 1337 | l2cap_chan_put(chan); |
5d3de7df VCG |
1338 | } |
1339 | ||
3df91ea2 AE |
1340 | mutex_unlock(&conn->chan_lock); |
1341 | ||
73d80deb LAD |
1342 | hci_chan_del(conn->hchan); |
1343 | ||
5d3de7df | 1344 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1345 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1346 | |
51a8efd7 | 1347 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1348 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1349 | smp_chan_destroy(conn); |
d26a2345 | 1350 | } |
5d3de7df VCG |
1351 | |
1352 | hcon->l2cap_data = NULL; | |
1353 | kfree(conn); | |
1354 | } | |
1355 | ||
6c9d42a1 | 1356 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1357 | { |
6c9d42a1 GP |
1358 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1359 | security_timer.work); | |
5d3de7df | 1360 | |
d06cc416 JH |
1361 | BT_DBG("conn %p", conn); |
1362 | ||
1363 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1364 | smp_chan_destroy(conn); | |
1365 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1366 | } | |
5d3de7df VCG |
1367 | } |
1368 | ||
1da177e4 LT |
1369 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1370 | { | |
0139418c | 1371 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1372 | struct hci_chan *hchan; |
1da177e4 | 1373 | |
0139418c | 1374 | if (conn || status) |
1da177e4 LT |
1375 | return conn; |
1376 | ||
73d80deb LAD |
1377 | hchan = hci_chan_create(hcon); |
1378 | if (!hchan) | |
1379 | return NULL; | |
1380 | ||
0139418c | 1381 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1382 | if (!conn) { |
1383 | hci_chan_del(hchan); | |
1da177e4 | 1384 | return NULL; |
73d80deb | 1385 | } |
1da177e4 LT |
1386 | |
1387 | hcon->l2cap_data = conn; | |
1388 | conn->hcon = hcon; | |
73d80deb | 1389 | conn->hchan = hchan; |
1da177e4 | 1390 | |
73d80deb | 1391 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1392 | |
dcc042d5 AE |
1393 | switch (hcon->type) { |
1394 | case AMP_LINK: | |
1395 | conn->mtu = hcon->hdev->block_mtu; | |
1396 | break; | |
1397 | ||
1398 | case LE_LINK: | |
1399 | if (hcon->hdev->le_mtu) { | |
1400 | conn->mtu = hcon->hdev->le_mtu; | |
1401 | break; | |
1402 | } | |
1403 | /* fall through */ | |
1404 | ||
1405 | default: | |
acd7d370 | 1406 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1407 | break; |
1408 | } | |
acd7d370 | 1409 | |
1da177e4 LT |
1410 | conn->src = &hcon->hdev->bdaddr; |
1411 | conn->dst = &hcon->dst; | |
1412 | ||
4e8402a3 MH |
1413 | conn->feat_mask = 0; |
1414 | ||
1da177e4 | 1415 | spin_lock_init(&conn->lock); |
3df91ea2 | 1416 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1417 | |
1418 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1419 | |
5d3de7df | 1420 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1421 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1422 | else |
030013d8 | 1423 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1424 | |
9f5a0d7b | 1425 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1426 | |
1da177e4 LT |
1427 | return conn; |
1428 | } | |
1429 | ||
1da177e4 | 1430 | /* ---- Socket interface ---- */ |
1da177e4 | 1431 | |
c2287681 | 1432 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1433 | * Returns closest match. |
1434 | */ | |
c2287681 IY |
1435 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1436 | bdaddr_t *src, | |
1437 | bdaddr_t *dst) | |
1da177e4 | 1438 | { |
23691d75 | 1439 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1440 | |
23691d75 | 1441 | read_lock(&chan_list_lock); |
e0f0cb56 | 1442 | |
23691d75 GP |
1443 | list_for_each_entry(c, &chan_list, global_l) { |
1444 | struct sock *sk = c->sk; | |
fe4128e0 | 1445 | |
89bc500e | 1446 | if (state && c->state != state) |
1da177e4 LT |
1447 | continue; |
1448 | ||
23691d75 | 1449 | if (c->psm == psm) { |
c2287681 IY |
1450 | int src_match, dst_match; |
1451 | int src_any, dst_any; | |
1452 | ||
1da177e4 | 1453 | /* Exact match. */ |
c2287681 IY |
1454 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1455 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1456 | if (src_match && dst_match) { | |
a7567b20 | 1457 | read_unlock(&chan_list_lock); |
23691d75 GP |
1458 | return c; |
1459 | } | |
1da177e4 LT |
1460 | |
1461 | /* Closest match */ | |
c2287681 IY |
1462 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1463 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1464 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1465 | (src_any && dst_any)) | |
23691d75 | 1466 | c1 = c; |
1da177e4 LT |
1467 | } |
1468 | } | |
1da177e4 | 1469 | |
23691d75 | 1470 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1471 | |
23691d75 | 1472 | return c1; |
1da177e4 LT |
1473 | } |
1474 | ||
8e9f9892 AG |
1475 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1476 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1477 | { |
5d41ce1d | 1478 | struct sock *sk = chan->sk; |
1da177e4 | 1479 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1480 | struct l2cap_conn *conn; |
1481 | struct hci_conn *hcon; | |
1482 | struct hci_dev *hdev; | |
09ab6f4c | 1483 | __u8 auth_type; |
44d0e48e | 1484 | int err; |
1da177e4 | 1485 | |
6ed93dc6 | 1486 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1487 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1488 | |
af05b30b GP |
1489 | hdev = hci_get_route(dst, src); |
1490 | if (!hdev) | |
1da177e4 LT |
1491 | return -EHOSTUNREACH; |
1492 | ||
09fd0de5 | 1493 | hci_dev_lock(hdev); |
1da177e4 | 1494 | |
6be36555 | 1495 | l2cap_chan_lock(chan); |
03a00194 GP |
1496 | |
1497 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1498 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1499 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1500 | err = -EINVAL; | |
1501 | goto done; | |
1502 | } | |
1503 | ||
1504 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1505 | err = -EINVAL; | |
1506 | goto done; | |
1507 | } | |
1508 | ||
1509 | switch (chan->mode) { | |
1510 | case L2CAP_MODE_BASIC: | |
1511 | break; | |
1512 | case L2CAP_MODE_ERTM: | |
1513 | case L2CAP_MODE_STREAMING: | |
1514 | if (!disable_ertm) | |
1515 | break; | |
1516 | /* fall through */ | |
1517 | default: | |
1518 | err = -ENOTSUPP; | |
1519 | goto done; | |
1520 | } | |
1521 | ||
0797e01d | 1522 | switch (chan->state) { |
03a00194 GP |
1523 | case BT_CONNECT: |
1524 | case BT_CONNECT2: | |
1525 | case BT_CONFIG: | |
1526 | /* Already connecting */ | |
1527 | err = 0; | |
1528 | goto done; | |
1529 | ||
1530 | case BT_CONNECTED: | |
1531 | /* Already connected */ | |
1532 | err = -EISCONN; | |
1533 | goto done; | |
1534 | ||
1535 | case BT_OPEN: | |
1536 | case BT_BOUND: | |
1537 | /* Can connect */ | |
1538 | break; | |
1539 | ||
1540 | default: | |
1541 | err = -EBADFD; | |
1542 | goto done; | |
1543 | } | |
1544 | ||
1545 | /* Set destination address and psm */ | |
0797e01d | 1546 | lock_sock(sk); |
9219b2a0 | 1547 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1548 | release_sock(sk); |
1549 | ||
03a00194 GP |
1550 | chan->psm = psm; |
1551 | chan->dcid = cid; | |
1da177e4 | 1552 | |
4343478f | 1553 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1554 | |
fe4128e0 | 1555 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1556 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1557 | chan->sec_level, auth_type); |
acd7d370 | 1558 | else |
8e9f9892 | 1559 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1560 | chan->sec_level, auth_type); |
acd7d370 | 1561 | |
30e76272 VT |
1562 | if (IS_ERR(hcon)) { |
1563 | err = PTR_ERR(hcon); | |
1da177e4 | 1564 | goto done; |
30e76272 | 1565 | } |
1da177e4 LT |
1566 | |
1567 | conn = l2cap_conn_add(hcon, 0); | |
1568 | if (!conn) { | |
1569 | hci_conn_put(hcon); | |
30e76272 | 1570 | err = -ENOMEM; |
1da177e4 LT |
1571 | goto done; |
1572 | } | |
1573 | ||
9f0caeb1 VCG |
1574 | if (hcon->type == LE_LINK) { |
1575 | err = 0; | |
1576 | ||
1577 | if (!list_empty(&conn->chan_l)) { | |
1578 | err = -EBUSY; | |
1579 | hci_conn_put(hcon); | |
1580 | } | |
1581 | ||
1582 | if (err) | |
1583 | goto done; | |
1584 | } | |
1585 | ||
1da177e4 LT |
1586 | /* Update source addr of the socket */ |
1587 | bacpy(src, conn->src); | |
1588 | ||
6be36555 | 1589 | l2cap_chan_unlock(chan); |
48454079 | 1590 | l2cap_chan_add(conn, chan); |
6be36555 | 1591 | l2cap_chan_lock(chan); |
48454079 | 1592 | |
6be36555 | 1593 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1594 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1595 | |
1596 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1597 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1598 | __clear_chan_timer(chan); |
d45fc423 | 1599 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1600 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1601 | } else |
fc7f8a7e | 1602 | l2cap_do_start(chan); |
1da177e4 LT |
1603 | } |
1604 | ||
30e76272 VT |
1605 | err = 0; |
1606 | ||
1da177e4 | 1607 | done: |
6be36555 | 1608 | l2cap_chan_unlock(chan); |
09fd0de5 | 1609 | hci_dev_unlock(hdev); |
1da177e4 LT |
1610 | hci_dev_put(hdev); |
1611 | return err; | |
1612 | } | |
1613 | ||
dcba0dba | 1614 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1615 | { |
8c1d787b | 1616 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1617 | DECLARE_WAITQUEUE(wait, current); |
1618 | int err = 0; | |
1619 | int timeo = HZ/5; | |
1620 | ||
2b0b05dd | 1621 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1622 | set_current_state(TASK_INTERRUPTIBLE); |
1623 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1624 | if (!timeo) |
1625 | timeo = HZ/5; | |
1626 | ||
1627 | if (signal_pending(current)) { | |
1628 | err = sock_intr_errno(timeo); | |
1629 | break; | |
1630 | } | |
1631 | ||
1632 | release_sock(sk); | |
1633 | timeo = schedule_timeout(timeo); | |
1634 | lock_sock(sk); | |
a71a0cf4 | 1635 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1636 | |
1637 | err = sock_error(sk); | |
1638 | if (err) | |
1639 | break; | |
1640 | } | |
1641 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1642 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1643 | return err; |
1644 | } | |
1645 | ||
721c4181 | 1646 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1647 | { |
721c4181 | 1648 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1649 | monitor_timer.work); |
e90bac06 | 1650 | |
525cd185 | 1651 | BT_DBG("chan %p", chan); |
0e98958d | 1652 | |
6be36555 AE |
1653 | l2cap_chan_lock(chan); |
1654 | ||
80909e04 | 1655 | if (!chan->conn) { |
6be36555 | 1656 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1657 | l2cap_chan_put(chan); |
e90bac06 GP |
1658 | return; |
1659 | } | |
1660 | ||
401bb1f7 | 1661 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1662 | |
6be36555 | 1663 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1664 | l2cap_chan_put(chan); |
e90bac06 GP |
1665 | } |
1666 | ||
721c4181 | 1667 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1668 | { |
721c4181 | 1669 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1670 | retrans_timer.work); |
e90bac06 | 1671 | |
49208c9c | 1672 | BT_DBG("chan %p", chan); |
0e98958d | 1673 | |
6be36555 AE |
1674 | l2cap_chan_lock(chan); |
1675 | ||
80909e04 MM |
1676 | if (!chan->conn) { |
1677 | l2cap_chan_unlock(chan); | |
1678 | l2cap_chan_put(chan); | |
1679 | return; | |
1680 | } | |
6be36555 | 1681 | |
401bb1f7 | 1682 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1683 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1684 | l2cap_chan_put(chan); |
e90bac06 GP |
1685 | } |
1686 | ||
d660366d GP |
1687 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1688 | struct sk_buff_head *skbs) | |
6840ed07 | 1689 | { |
ccbb84af | 1690 | struct sk_buff *skb; |
3733937d | 1691 | struct l2cap_ctrl *control; |
6840ed07 | 1692 | |
3733937d MM |
1693 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1694 | ||
3733937d MM |
1695 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1696 | ||
1697 | while (!skb_queue_empty(&chan->tx_q)) { | |
1698 | ||
1699 | skb = skb_dequeue(&chan->tx_q); | |
1700 | ||
1701 | bt_cb(skb)->control.retries = 1; | |
1702 | control = &bt_cb(skb)->control; | |
1703 | ||
1704 | control->reqseq = 0; | |
1705 | control->txseq = chan->next_tx_seq; | |
1706 | ||
1707 | __pack_control(chan, control, skb); | |
6840ed07 | 1708 | |
47d1ec61 | 1709 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1710 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1711 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1712 | } |
1713 | ||
4343478f | 1714 | l2cap_do_send(chan, skb); |
6840ed07 | 1715 | |
b4400672 | 1716 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1717 | |
836be934 | 1718 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1719 | chan->frames_sent++; |
6840ed07 | 1720 | } |
6840ed07 GP |
1721 | } |
1722 | ||
67c9e840 | 1723 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1724 | { |
1725 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1726 | struct l2cap_ctrl *control; |
1727 | int sent = 0; | |
1728 | ||
1729 | BT_DBG("chan %p", chan); | |
1c2acffb | 1730 | |
89bc500e | 1731 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1732 | return -ENOTCONN; |
e90bac06 | 1733 | |
94122bbe MM |
1734 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1735 | return 0; | |
1736 | ||
18a48e76 MM |
1737 | while (chan->tx_send_head && |
1738 | chan->unacked_frames < chan->remote_tx_win && | |
1739 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1740 | |
18a48e76 | 1741 | skb = chan->tx_send_head; |
e90bac06 | 1742 | |
18a48e76 MM |
1743 | bt_cb(skb)->control.retries = 1; |
1744 | control = &bt_cb(skb)->control; | |
95ffa978 | 1745 | |
e2ab4353 | 1746 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1747 | control->final = 1; |
e2ab4353 | 1748 | |
18a48e76 MM |
1749 | control->reqseq = chan->buffer_seq; |
1750 | chan->last_acked_seq = chan->buffer_seq; | |
1751 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1752 | |
18a48e76 | 1753 | __pack_control(chan, control, skb); |
e90bac06 | 1754 | |
47d1ec61 | 1755 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1756 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1757 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1758 | } |
1759 | ||
18a48e76 MM |
1760 | /* Clone after data has been modified. Data is assumed to be |
1761 | read-only (for locking purposes) on cloned sk_buffs. | |
1762 | */ | |
1763 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1764 | |
18a48e76 MM |
1765 | if (!tx_skb) |
1766 | break; | |
1c2acffb | 1767 | |
18a48e76 | 1768 | __set_retrans_timer(chan); |
836be934 AE |
1769 | |
1770 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1771 | chan->unacked_frames++; |
6a026610 | 1772 | chan->frames_sent++; |
18a48e76 | 1773 | sent++; |
1c2acffb | 1774 | |
58d35f87 GP |
1775 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1776 | chan->tx_send_head = NULL; | |
1c2acffb | 1777 | else |
58d35f87 | 1778 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1779 | |
1780 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1781 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1782 | } |
1783 | ||
b4400672 AE |
1784 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1785 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1786 | |
1787 | return sent; | |
9e917af1 GP |
1788 | } |
1789 | ||
e1fbd4c1 MM |
1790 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1791 | { | |
1792 | struct l2cap_ctrl control; | |
1793 | struct sk_buff *skb; | |
1794 | struct sk_buff *tx_skb; | |
1795 | u16 seq; | |
1796 | ||
1797 | BT_DBG("chan %p", chan); | |
1798 | ||
1799 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1800 | return; | |
1801 | ||
1802 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1803 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1804 | ||
1805 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1806 | if (!skb) { | |
1807 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1808 | seq); | |
1809 | continue; | |
1810 | } | |
1811 | ||
1812 | bt_cb(skb)->control.retries++; | |
1813 | control = bt_cb(skb)->control; | |
1814 | ||
1815 | if (chan->max_tx != 0 && | |
1816 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1817 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1818 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1819 | l2cap_seq_list_clear(&chan->retrans_list); | |
1820 | break; | |
1821 | } | |
1822 | ||
1823 | control.reqseq = chan->buffer_seq; | |
1824 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1825 | control.final = 1; | |
1826 | else | |
1827 | control.final = 0; | |
1828 | ||
1829 | if (skb_cloned(skb)) { | |
1830 | /* Cloned sk_buffs are read-only, so we need a | |
1831 | * writeable copy | |
1832 | */ | |
1833 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1834 | } else { | |
1835 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1836 | } | |
1837 | ||
1838 | if (!tx_skb) { | |
1839 | l2cap_seq_list_clear(&chan->retrans_list); | |
1840 | break; | |
1841 | } | |
1842 | ||
1843 | /* Update skb contents */ | |
1844 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1845 | put_unaligned_le32(__pack_extended_control(&control), | |
1846 | tx_skb->data + L2CAP_HDR_SIZE); | |
1847 | } else { | |
1848 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1849 | tx_skb->data + L2CAP_HDR_SIZE); | |
1850 | } | |
1851 | ||
1852 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1853 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1854 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1855 | L2CAP_FCS_SIZE)); | |
1856 | } | |
1857 | ||
1858 | l2cap_do_send(chan, tx_skb); | |
1859 | ||
1860 | BT_DBG("Resent txseq %d", control.txseq); | |
1861 | ||
1862 | chan->last_acked_seq = chan->buffer_seq; | |
1863 | } | |
1864 | } | |
1865 | ||
f80842a8 MM |
1866 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1867 | struct l2cap_ctrl *control) | |
1868 | { | |
1869 | BT_DBG("chan %p, control %p", chan, control); | |
1870 | ||
1871 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1872 | l2cap_ertm_resend(chan); | |
1873 | } | |
1874 | ||
d2a7ac5d MM |
1875 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1876 | struct l2cap_ctrl *control) | |
1877 | { | |
e1fbd4c1 MM |
1878 | struct sk_buff *skb; |
1879 | ||
1880 | BT_DBG("chan %p, control %p", chan, control); | |
1881 | ||
1882 | if (control->poll) | |
1883 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1884 | ||
1885 | l2cap_seq_list_clear(&chan->retrans_list); | |
1886 | ||
1887 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1888 | return; | |
1889 | ||
1890 | if (chan->unacked_frames) { | |
1891 | skb_queue_walk(&chan->tx_q, skb) { | |
1892 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1893 | skb == chan->tx_send_head) | |
1894 | break; | |
1895 | } | |
1896 | ||
1897 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1898 | if (skb == chan->tx_send_head) | |
1899 | break; | |
1900 | ||
1901 | l2cap_seq_list_append(&chan->retrans_list, | |
1902 | bt_cb(skb)->control.txseq); | |
1903 | } | |
1904 | ||
1905 | l2cap_ertm_resend(chan); | |
1906 | } | |
d2a7ac5d MM |
1907 | } |
1908 | ||
0a0aba42 | 1909 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1910 | { |
0a0aba42 MM |
1911 | struct l2cap_ctrl control; |
1912 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1913 | chan->last_acked_seq); | |
1914 | int threshold; | |
9e917af1 | 1915 | |
0a0aba42 MM |
1916 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1917 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1918 | |
0a0aba42 MM |
1919 | memset(&control, 0, sizeof(control)); |
1920 | control.sframe = 1; | |
dfc909be | 1921 | |
0a0aba42 MM |
1922 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1923 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1924 | __clear_ack_timer(chan); | |
1925 | control.super = L2CAP_SUPER_RNR; | |
1926 | control.reqseq = chan->buffer_seq; | |
1927 | l2cap_send_sframe(chan, &control); | |
1928 | } else { | |
1929 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1930 | l2cap_ertm_send(chan); | |
1931 | /* If any i-frames were sent, they included an ack */ | |
1932 | if (chan->buffer_seq == chan->last_acked_seq) | |
1933 | frames_to_ack = 0; | |
1934 | } | |
dfc909be | 1935 | |
c20f8e35 | 1936 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
1937 | * Calculate without mul or div |
1938 | */ | |
c20f8e35 | 1939 | threshold = chan->ack_win; |
0a0aba42 MM |
1940 | threshold += threshold << 1; |
1941 | threshold >>= 2; | |
1942 | ||
b4400672 | 1943 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1944 | threshold); |
1945 | ||
1946 | if (frames_to_ack >= threshold) { | |
1947 | __clear_ack_timer(chan); | |
1948 | control.super = L2CAP_SUPER_RR; | |
1949 | control.reqseq = chan->buffer_seq; | |
1950 | l2cap_send_sframe(chan, &control); | |
1951 | frames_to_ack = 0; | |
1952 | } | |
1c2acffb | 1953 | |
0a0aba42 MM |
1954 | if (frames_to_ack) |
1955 | __set_ack_timer(chan); | |
1956 | } | |
b17e73bb SJ |
1957 | } |
1958 | ||
04124681 GP |
1959 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1960 | struct msghdr *msg, int len, | |
1961 | int count, struct sk_buff *skb) | |
1c2acffb | 1962 | { |
0952a57a | 1963 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1964 | struct sk_buff **frag; |
90338947 | 1965 | int sent = 0; |
1da177e4 | 1966 | |
59203a21 | 1967 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1968 | return -EFAULT; |
1da177e4 LT |
1969 | |
1970 | sent += count; | |
1971 | len -= count; | |
1972 | ||
1973 | /* Continuation fragments (no L2CAP header) */ | |
1974 | frag = &skb_shinfo(skb)->frag_list; | |
1975 | while (len) { | |
fbe00700 GP |
1976 | struct sk_buff *tmp; |
1977 | ||
1da177e4 LT |
1978 | count = min_t(unsigned int, conn->mtu, len); |
1979 | ||
fbe00700 GP |
1980 | tmp = chan->ops->alloc_skb(chan, count, |
1981 | msg->msg_flags & MSG_DONTWAIT); | |
1982 | if (IS_ERR(tmp)) | |
1983 | return PTR_ERR(tmp); | |
1984 | ||
1985 | *frag = tmp; | |
2f7719ce | 1986 | |
1c2acffb GP |
1987 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1988 | return -EFAULT; | |
1da177e4 | 1989 | |
5e59b791 LAD |
1990 | (*frag)->priority = skb->priority; |
1991 | ||
1da177e4 LT |
1992 | sent += count; |
1993 | len -= count; | |
1994 | ||
2d0ed3d5 GP |
1995 | skb->len += (*frag)->len; |
1996 | skb->data_len += (*frag)->len; | |
1997 | ||
1da177e4 LT |
1998 | frag = &(*frag)->next; |
1999 | } | |
1da177e4 LT |
2000 | |
2001 | return sent; | |
1c2acffb | 2002 | } |
1da177e4 | 2003 | |
5e59b791 | 2004 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2005 | struct msghdr *msg, size_t len, |
2006 | u32 priority) | |
1c2acffb | 2007 | { |
8c1d787b | 2008 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2009 | struct sk_buff *skb; |
03a51213 | 2010 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2011 | struct l2cap_hdr *lh; |
2012 | ||
b4400672 | 2013 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2014 | |
2015 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2016 | |
2017 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2018 | msg->msg_flags & MSG_DONTWAIT); |
2019 | if (IS_ERR(skb)) | |
2020 | return skb; | |
1c2acffb | 2021 | |
5e59b791 LAD |
2022 | skb->priority = priority; |
2023 | ||
1c2acffb GP |
2024 | /* Create L2CAP header */ |
2025 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2026 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2027 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2028 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2029 | |
0952a57a | 2030 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2031 | if (unlikely(err < 0)) { |
2032 | kfree_skb(skb); | |
2033 | return ERR_PTR(err); | |
2034 | } | |
2035 | return skb; | |
2036 | } | |
2037 | ||
5e59b791 | 2038 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2039 | struct msghdr *msg, size_t len, |
2040 | u32 priority) | |
1c2acffb | 2041 | { |
8c1d787b | 2042 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2043 | struct sk_buff *skb; |
f2ba7fae | 2044 | int err, count; |
1c2acffb GP |
2045 | struct l2cap_hdr *lh; |
2046 | ||
b4400672 | 2047 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2048 | |
f2ba7fae | 2049 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2050 | |
f2ba7fae | 2051 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2052 | msg->msg_flags & MSG_DONTWAIT); |
2053 | if (IS_ERR(skb)) | |
2054 | return skb; | |
1c2acffb | 2055 | |
5e59b791 LAD |
2056 | skb->priority = priority; |
2057 | ||
1c2acffb GP |
2058 | /* Create L2CAP header */ |
2059 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2060 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2061 | lh->len = cpu_to_le16(len); |
1c2acffb | 2062 | |
0952a57a | 2063 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2064 | if (unlikely(err < 0)) { |
2065 | kfree_skb(skb); | |
2066 | return ERR_PTR(err); | |
2067 | } | |
2068 | return skb; | |
2069 | } | |
2070 | ||
ab0ff76d | 2071 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2072 | struct msghdr *msg, size_t len, |
2073 | u16 sdulen) | |
1c2acffb | 2074 | { |
8c1d787b | 2075 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2076 | struct sk_buff *skb; |
e4ca6d98 | 2077 | int err, count, hlen; |
1c2acffb GP |
2078 | struct l2cap_hdr *lh; |
2079 | ||
b4400672 | 2080 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2081 | |
0ee0d208 GP |
2082 | if (!conn) |
2083 | return ERR_PTR(-ENOTCONN); | |
2084 | ||
ba7aa64f | 2085 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2086 | |
c74e560c | 2087 | if (sdulen) |
03a51213 | 2088 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2089 | |
47d1ec61 | 2090 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2091 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2092 | |
1c2acffb | 2093 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2094 | |
2095 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2096 | msg->msg_flags & MSG_DONTWAIT); |
2097 | if (IS_ERR(skb)) | |
2098 | return skb; | |
1c2acffb GP |
2099 | |
2100 | /* Create L2CAP header */ | |
2101 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2102 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2103 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2104 | |
18a48e76 MM |
2105 | /* Control header is populated later */ |
2106 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2107 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2108 | else | |
2109 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2110 | |
c74e560c | 2111 | if (sdulen) |
03a51213 | 2112 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2113 | |
0952a57a | 2114 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2115 | if (unlikely(err < 0)) { |
2116 | kfree_skb(skb); | |
2117 | return ERR_PTR(err); | |
2118 | } | |
e90bac06 | 2119 | |
18a48e76 | 2120 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2121 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2122 | return skb; |
1da177e4 LT |
2123 | } |
2124 | ||
94122bbe MM |
2125 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2126 | struct sk_buff_head *seg_queue, | |
2127 | struct msghdr *msg, size_t len) | |
c74e560c | 2128 | { |
c74e560c | 2129 | struct sk_buff *skb; |
94122bbe MM |
2130 | u16 sdu_len; |
2131 | size_t pdu_len; | |
94122bbe | 2132 | u8 sar; |
c74e560c | 2133 | |
b4400672 | 2134 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2135 | |
94122bbe MM |
2136 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2137 | * so fragmented skbs are not used. The HCI layer's handling | |
2138 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2139 | */ | |
c74e560c | 2140 | |
94122bbe MM |
2141 | /* PDU size is derived from the HCI MTU */ |
2142 | pdu_len = chan->conn->mtu; | |
c74e560c | 2143 | |
94122bbe MM |
2144 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2145 | ||
2146 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2147 | if (chan->fcs) |
2148 | pdu_len -= L2CAP_FCS_SIZE; | |
2149 | ||
ba7aa64f | 2150 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2151 | |
2152 | /* Remote device may have requested smaller PDUs */ | |
2153 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2154 | ||
2155 | if (len <= pdu_len) { | |
2156 | sar = L2CAP_SAR_UNSEGMENTED; | |
2157 | sdu_len = 0; | |
2158 | pdu_len = len; | |
2159 | } else { | |
2160 | sar = L2CAP_SAR_START; | |
2161 | sdu_len = len; | |
2162 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2163 | } | |
2164 | ||
2165 | while (len > 0) { | |
2166 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2167 | |
c74e560c | 2168 | if (IS_ERR(skb)) { |
94122bbe | 2169 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2170 | return PTR_ERR(skb); |
2171 | } | |
2172 | ||
94122bbe MM |
2173 | bt_cb(skb)->control.sar = sar; |
2174 | __skb_queue_tail(seg_queue, skb); | |
2175 | ||
2176 | len -= pdu_len; | |
2177 | if (sdu_len) { | |
2178 | sdu_len = 0; | |
2179 | pdu_len += L2CAP_SDULEN_SIZE; | |
2180 | } | |
2181 | ||
2182 | if (len <= pdu_len) { | |
2183 | sar = L2CAP_SAR_END; | |
2184 | pdu_len = len; | |
2185 | } else { | |
2186 | sar = L2CAP_SAR_CONTINUE; | |
2187 | } | |
c74e560c | 2188 | } |
c74e560c | 2189 | |
f0f62799 | 2190 | return 0; |
c74e560c GP |
2191 | } |
2192 | ||
5e59b791 LAD |
2193 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2194 | u32 priority) | |
9a91a04a | 2195 | { |
9a91a04a | 2196 | struct sk_buff *skb; |
9a91a04a | 2197 | int err; |
94122bbe | 2198 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2199 | |
2200 | /* Connectionless channel */ | |
715ec005 | 2201 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2202 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2203 | if (IS_ERR(skb)) |
2204 | return PTR_ERR(skb); | |
2205 | ||
2206 | l2cap_do_send(chan, skb); | |
2207 | return len; | |
2208 | } | |
2209 | ||
2210 | switch (chan->mode) { | |
2211 | case L2CAP_MODE_BASIC: | |
2212 | /* Check outgoing MTU */ | |
2213 | if (len > chan->omtu) | |
2214 | return -EMSGSIZE; | |
2215 | ||
2216 | /* Create a basic PDU */ | |
5e59b791 | 2217 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2218 | if (IS_ERR(skb)) |
2219 | return PTR_ERR(skb); | |
2220 | ||
2221 | l2cap_do_send(chan, skb); | |
2222 | err = len; | |
2223 | break; | |
2224 | ||
2225 | case L2CAP_MODE_ERTM: | |
2226 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2227 | /* Check outgoing MTU */ |
2228 | if (len > chan->omtu) { | |
2229 | err = -EMSGSIZE; | |
2230 | break; | |
2231 | } | |
9a91a04a | 2232 | |
94122bbe | 2233 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2234 | |
94122bbe MM |
2235 | /* Do segmentation before calling in to the state machine, |
2236 | * since it's possible to block while waiting for memory | |
2237 | * allocation. | |
2238 | */ | |
2239 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2240 | |
94122bbe MM |
2241 | /* The channel could have been closed while segmenting, |
2242 | * check that it is still connected. | |
2243 | */ | |
2244 | if (chan->state != BT_CONNECTED) { | |
2245 | __skb_queue_purge(&seg_queue); | |
2246 | err = -ENOTCONN; | |
9a91a04a GP |
2247 | } |
2248 | ||
94122bbe | 2249 | if (err) |
9a91a04a | 2250 | break; |
9a91a04a | 2251 | |
3733937d | 2252 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2253 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2254 | else |
d660366d | 2255 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2256 | |
d660366d | 2257 | err = len; |
9a91a04a | 2258 | |
94122bbe MM |
2259 | /* If the skbs were not queued for sending, they'll still be in |
2260 | * seg_queue and need to be purged. | |
2261 | */ | |
2262 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2263 | break; |
2264 | ||
2265 | default: | |
2266 | BT_DBG("bad state %1.1x", chan->mode); | |
2267 | err = -EBADFD; | |
2268 | } | |
2269 | ||
2270 | return err; | |
2271 | } | |
2272 | ||
d2a7ac5d MM |
2273 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2274 | { | |
bed68bde MM |
2275 | struct l2cap_ctrl control; |
2276 | u16 seq; | |
2277 | ||
b4400672 | 2278 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2279 | |
2280 | memset(&control, 0, sizeof(control)); | |
2281 | control.sframe = 1; | |
2282 | control.super = L2CAP_SUPER_SREJ; | |
2283 | ||
2284 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2285 | seq = __next_seq(chan, seq)) { | |
2286 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2287 | control.reqseq = seq; | |
2288 | l2cap_send_sframe(chan, &control); | |
2289 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2294 | } |
2295 | ||
2296 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2297 | { | |
bed68bde MM |
2298 | struct l2cap_ctrl control; |
2299 | ||
2300 | BT_DBG("chan %p", chan); | |
2301 | ||
2302 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2303 | return; | |
2304 | ||
2305 | memset(&control, 0, sizeof(control)); | |
2306 | control.sframe = 1; | |
2307 | control.super = L2CAP_SUPER_SREJ; | |
2308 | control.reqseq = chan->srej_list.tail; | |
2309 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2310 | } |
2311 | ||
2312 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2313 | { | |
bed68bde MM |
2314 | struct l2cap_ctrl control; |
2315 | u16 initial_head; | |
2316 | u16 seq; | |
2317 | ||
b4400672 | 2318 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2319 | |
2320 | memset(&control, 0, sizeof(control)); | |
2321 | control.sframe = 1; | |
2322 | control.super = L2CAP_SUPER_SREJ; | |
2323 | ||
2324 | /* Capture initial list head to allow only one pass through the list. */ | |
2325 | initial_head = chan->srej_list.head; | |
2326 | ||
2327 | do { | |
2328 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2329 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2330 | break; | |
2331 | ||
2332 | control.reqseq = seq; | |
2333 | l2cap_send_sframe(chan, &control); | |
2334 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2335 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2336 | } |
2337 | ||
608bcc6d MM |
2338 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2339 | { | |
2340 | struct sk_buff *acked_skb; | |
2341 | u16 ackseq; | |
2342 | ||
b4400672 | 2343 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2344 | |
2345 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2346 | return; | |
2347 | ||
b4400672 | 2348 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2349 | chan->expected_ack_seq, chan->unacked_frames); |
2350 | ||
2351 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2352 | ackseq = __next_seq(chan, ackseq)) { | |
2353 | ||
2354 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2355 | if (acked_skb) { | |
2356 | skb_unlink(acked_skb, &chan->tx_q); | |
2357 | kfree_skb(acked_skb); | |
2358 | chan->unacked_frames--; | |
2359 | } | |
2360 | } | |
2361 | ||
2362 | chan->expected_ack_seq = reqseq; | |
2363 | ||
2364 | if (chan->unacked_frames == 0) | |
2365 | __clear_retrans_timer(chan); | |
2366 | ||
b4400672 | 2367 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2368 | } |
2369 | ||
2370 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2371 | { | |
2372 | BT_DBG("chan %p", chan); | |
2373 | ||
2374 | chan->expected_tx_seq = chan->buffer_seq; | |
2375 | l2cap_seq_list_clear(&chan->srej_list); | |
2376 | skb_queue_purge(&chan->srej_q); | |
2377 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2378 | } | |
2379 | ||
d660366d GP |
2380 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2381 | struct l2cap_ctrl *control, | |
2382 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2383 | { |
608bcc6d MM |
2384 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2385 | event); | |
2386 | ||
2387 | switch (event) { | |
2388 | case L2CAP_EV_DATA_REQUEST: | |
2389 | if (chan->tx_send_head == NULL) | |
2390 | chan->tx_send_head = skb_peek(skbs); | |
2391 | ||
2392 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2393 | l2cap_ertm_send(chan); | |
2394 | break; | |
2395 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2396 | BT_DBG("Enter LOCAL_BUSY"); | |
2397 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2398 | ||
2399 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2400 | /* The SREJ_SENT state must be aborted if we are to | |
2401 | * enter the LOCAL_BUSY state. | |
2402 | */ | |
2403 | l2cap_abort_rx_srej_sent(chan); | |
2404 | } | |
2405 | ||
2406 | l2cap_send_ack(chan); | |
2407 | ||
2408 | break; | |
2409 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2410 | BT_DBG("Exit LOCAL_BUSY"); | |
2411 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2412 | ||
2413 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2414 | struct l2cap_ctrl local_control; | |
2415 | ||
2416 | memset(&local_control, 0, sizeof(local_control)); | |
2417 | local_control.sframe = 1; | |
2418 | local_control.super = L2CAP_SUPER_RR; | |
2419 | local_control.poll = 1; | |
2420 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2421 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2422 | |
2423 | chan->retry_count = 1; | |
2424 | __set_monitor_timer(chan); | |
2425 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2426 | } | |
2427 | break; | |
2428 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2429 | l2cap_process_reqseq(chan, control->reqseq); | |
2430 | break; | |
2431 | case L2CAP_EV_EXPLICIT_POLL: | |
2432 | l2cap_send_rr_or_rnr(chan, 1); | |
2433 | chan->retry_count = 1; | |
2434 | __set_monitor_timer(chan); | |
2435 | __clear_ack_timer(chan); | |
2436 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2437 | break; | |
2438 | case L2CAP_EV_RETRANS_TO: | |
2439 | l2cap_send_rr_or_rnr(chan, 1); | |
2440 | chan->retry_count = 1; | |
2441 | __set_monitor_timer(chan); | |
2442 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2443 | break; | |
2444 | case L2CAP_EV_RECV_FBIT: | |
2445 | /* Nothing to process */ | |
2446 | break; | |
2447 | default: | |
2448 | break; | |
2449 | } | |
608bcc6d MM |
2450 | } |
2451 | ||
d660366d GP |
2452 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2453 | struct l2cap_ctrl *control, | |
2454 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2455 | { |
608bcc6d MM |
2456 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2457 | event); | |
2458 | ||
2459 | switch (event) { | |
2460 | case L2CAP_EV_DATA_REQUEST: | |
2461 | if (chan->tx_send_head == NULL) | |
2462 | chan->tx_send_head = skb_peek(skbs); | |
2463 | /* Queue data, but don't send. */ | |
2464 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2465 | break; | |
2466 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2467 | BT_DBG("Enter LOCAL_BUSY"); | |
2468 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2469 | ||
2470 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2471 | /* The SREJ_SENT state must be aborted if we are to | |
2472 | * enter the LOCAL_BUSY state. | |
2473 | */ | |
2474 | l2cap_abort_rx_srej_sent(chan); | |
2475 | } | |
2476 | ||
2477 | l2cap_send_ack(chan); | |
2478 | ||
2479 | break; | |
2480 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2481 | BT_DBG("Exit LOCAL_BUSY"); | |
2482 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2483 | ||
2484 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2485 | struct l2cap_ctrl local_control; | |
2486 | memset(&local_control, 0, sizeof(local_control)); | |
2487 | local_control.sframe = 1; | |
2488 | local_control.super = L2CAP_SUPER_RR; | |
2489 | local_control.poll = 1; | |
2490 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2491 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2492 | |
2493 | chan->retry_count = 1; | |
2494 | __set_monitor_timer(chan); | |
2495 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2496 | } | |
2497 | break; | |
2498 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2499 | l2cap_process_reqseq(chan, control->reqseq); | |
2500 | ||
2501 | /* Fall through */ | |
2502 | ||
2503 | case L2CAP_EV_RECV_FBIT: | |
2504 | if (control && control->final) { | |
2505 | __clear_monitor_timer(chan); | |
2506 | if (chan->unacked_frames > 0) | |
2507 | __set_retrans_timer(chan); | |
2508 | chan->retry_count = 0; | |
2509 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2510 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2511 | } | |
2512 | break; | |
2513 | case L2CAP_EV_EXPLICIT_POLL: | |
2514 | /* Ignore */ | |
2515 | break; | |
2516 | case L2CAP_EV_MONITOR_TO: | |
2517 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2518 | l2cap_send_rr_or_rnr(chan, 1); | |
2519 | __set_monitor_timer(chan); | |
2520 | chan->retry_count++; | |
2521 | } else { | |
2522 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2523 | } | |
2524 | break; | |
2525 | default: | |
2526 | break; | |
2527 | } | |
608bcc6d MM |
2528 | } |
2529 | ||
d660366d GP |
2530 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2531 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2532 | { |
608bcc6d MM |
2533 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2534 | chan, control, skbs, event, chan->tx_state); | |
2535 | ||
2536 | switch (chan->tx_state) { | |
2537 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2538 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2539 | break; |
2540 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2541 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2542 | break; |
2543 | default: | |
2544 | /* Ignore event */ | |
2545 | break; | |
2546 | } | |
608bcc6d MM |
2547 | } |
2548 | ||
4b51dae9 MM |
2549 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2550 | struct l2cap_ctrl *control) | |
2551 | { | |
2552 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2553 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2554 | } |
2555 | ||
f80842a8 MM |
2556 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2557 | struct l2cap_ctrl *control) | |
2558 | { | |
2559 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2560 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2561 | } |
2562 | ||
1da177e4 LT |
2563 | /* Copy frame to all raw sockets on that connection */ |
2564 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2565 | { | |
1da177e4 | 2566 | struct sk_buff *nskb; |
48454079 | 2567 | struct l2cap_chan *chan; |
1da177e4 LT |
2568 | |
2569 | BT_DBG("conn %p", conn); | |
2570 | ||
3df91ea2 | 2571 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2572 | |
3df91ea2 | 2573 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2574 | struct sock *sk = chan->sk; |
715ec005 | 2575 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2576 | continue; |
2577 | ||
2578 | /* Don't send frame to the socket it came from */ | |
2579 | if (skb->sk == sk) | |
2580 | continue; | |
af05b30b GP |
2581 | nskb = skb_clone(skb, GFP_ATOMIC); |
2582 | if (!nskb) | |
1da177e4 LT |
2583 | continue; |
2584 | ||
80b98027 | 2585 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2586 | kfree_skb(nskb); |
2587 | } | |
3d57dc68 | 2588 | |
3df91ea2 | 2589 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2590 | } |
2591 | ||
2592 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2593 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2594 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2595 | { |
2596 | struct sk_buff *skb, **frag; | |
2597 | struct l2cap_cmd_hdr *cmd; | |
2598 | struct l2cap_hdr *lh; | |
2599 | int len, count; | |
2600 | ||
b4400672 AE |
2601 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2602 | conn, code, ident, dlen); | |
1da177e4 LT |
2603 | |
2604 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2605 | count = min_t(unsigned int, conn->mtu, len); | |
2606 | ||
2607 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2608 | if (!skb) | |
2609 | return NULL; | |
2610 | ||
2611 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2612 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2613 | |
2614 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2615 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2616 | else |
ac73498c | 2617 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2618 | |
2619 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2620 | cmd->code = code; | |
2621 | cmd->ident = ident; | |
aca3192c | 2622 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2623 | |
2624 | if (dlen) { | |
2625 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2626 | memcpy(skb_put(skb, count), data, count); | |
2627 | data += count; | |
2628 | } | |
2629 | ||
2630 | len -= skb->len; | |
2631 | ||
2632 | /* Continuation fragments (no L2CAP header) */ | |
2633 | frag = &skb_shinfo(skb)->frag_list; | |
2634 | while (len) { | |
2635 | count = min_t(unsigned int, conn->mtu, len); | |
2636 | ||
2637 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2638 | if (!*frag) | |
2639 | goto fail; | |
2640 | ||
2641 | memcpy(skb_put(*frag, count), data, count); | |
2642 | ||
2643 | len -= count; | |
2644 | data += count; | |
2645 | ||
2646 | frag = &(*frag)->next; | |
2647 | } | |
2648 | ||
2649 | return skb; | |
2650 | ||
2651 | fail: | |
2652 | kfree_skb(skb); | |
2653 | return NULL; | |
2654 | } | |
2655 | ||
2656 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2657 | { | |
2658 | struct l2cap_conf_opt *opt = *ptr; | |
2659 | int len; | |
2660 | ||
2661 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2662 | *ptr += len; | |
2663 | ||
2664 | *type = opt->type; | |
2665 | *olen = opt->len; | |
2666 | ||
2667 | switch (opt->len) { | |
2668 | case 1: | |
2669 | *val = *((u8 *) opt->val); | |
2670 | break; | |
2671 | ||
2672 | case 2: | |
bfaaeb3e | 2673 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2674 | break; |
2675 | ||
2676 | case 4: | |
bfaaeb3e | 2677 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2678 | break; |
2679 | ||
2680 | default: | |
2681 | *val = (unsigned long) opt->val; | |
2682 | break; | |
2683 | } | |
2684 | ||
b4400672 | 2685 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2686 | return len; |
2687 | } | |
2688 | ||
1da177e4 LT |
2689 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2690 | { | |
2691 | struct l2cap_conf_opt *opt = *ptr; | |
2692 | ||
b4400672 | 2693 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2694 | |
2695 | opt->type = type; | |
2696 | opt->len = len; | |
2697 | ||
2698 | switch (len) { | |
2699 | case 1: | |
2700 | *((u8 *) opt->val) = val; | |
2701 | break; | |
2702 | ||
2703 | case 2: | |
4f8b691c | 2704 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2705 | break; |
2706 | ||
2707 | case 4: | |
4f8b691c | 2708 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2709 | break; |
2710 | ||
2711 | default: | |
2712 | memcpy(opt->val, (void *) val, len); | |
2713 | break; | |
2714 | } | |
2715 | ||
2716 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2717 | } | |
2718 | ||
f89cef09 AE |
2719 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2720 | { | |
2721 | struct l2cap_conf_efs efs; | |
2722 | ||
1ec918ce | 2723 | switch (chan->mode) { |
f89cef09 AE |
2724 | case L2CAP_MODE_ERTM: |
2725 | efs.id = chan->local_id; | |
2726 | efs.stype = chan->local_stype; | |
2727 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2728 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2729 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2730 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2731 | break; |
2732 | ||
2733 | case L2CAP_MODE_STREAMING: | |
2734 | efs.id = 1; | |
2735 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2736 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2737 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2738 | efs.acc_lat = 0; | |
2739 | efs.flush_to = 0; | |
2740 | break; | |
2741 | ||
2742 | default: | |
2743 | return; | |
2744 | } | |
2745 | ||
2746 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2747 | (unsigned long) &efs); |
f89cef09 AE |
2748 | } |
2749 | ||
721c4181 | 2750 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2751 | { |
721c4181 | 2752 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2753 | ack_timer.work); |
2754 | u16 frames_to_ack; | |
c1b4f43b | 2755 | |
2fb9b3d4 GP |
2756 | BT_DBG("chan %p", chan); |
2757 | ||
6be36555 AE |
2758 | l2cap_chan_lock(chan); |
2759 | ||
0362520b MM |
2760 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2761 | chan->last_acked_seq); | |
6be36555 | 2762 | |
0362520b MM |
2763 | if (frames_to_ack) |
2764 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2765 | |
0362520b | 2766 | l2cap_chan_unlock(chan); |
09bfb2ee | 2767 | l2cap_chan_put(chan); |
c1b4f43b GP |
2768 | } |
2769 | ||
466f8004 | 2770 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2771 | { |
3c588192 MM |
2772 | int err; |
2773 | ||
105bdf9e MM |
2774 | chan->next_tx_seq = 0; |
2775 | chan->expected_tx_seq = 0; | |
42e5c802 | 2776 | chan->expected_ack_seq = 0; |
6a026610 | 2777 | chan->unacked_frames = 0; |
42e5c802 | 2778 | chan->buffer_seq = 0; |
6a026610 | 2779 | chan->frames_sent = 0; |
105bdf9e MM |
2780 | chan->last_acked_seq = 0; |
2781 | chan->sdu = NULL; | |
2782 | chan->sdu_last_frag = NULL; | |
2783 | chan->sdu_len = 0; | |
2784 | ||
d34c34fb MM |
2785 | skb_queue_head_init(&chan->tx_q); |
2786 | ||
105bdf9e MM |
2787 | if (chan->mode != L2CAP_MODE_ERTM) |
2788 | return 0; | |
2789 | ||
2790 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2791 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2792 | |
721c4181 GP |
2793 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2794 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2795 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2796 | |
f1c6775b | 2797 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2798 | |
3c588192 MM |
2799 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2800 | if (err < 0) | |
2801 | return err; | |
2802 | ||
9dc9affc MM |
2803 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2804 | if (err < 0) | |
2805 | l2cap_seq_list_free(&chan->srej_list); | |
2806 | ||
2807 | return err; | |
0565c1c2 GP |
2808 | } |
2809 | ||
f2fcfcd6 GP |
2810 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2811 | { | |
2812 | switch (mode) { | |
2813 | case L2CAP_MODE_STREAMING: | |
2814 | case L2CAP_MODE_ERTM: | |
2815 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2816 | return mode; | |
2817 | /* fall through */ | |
2818 | default: | |
2819 | return L2CAP_MODE_BASIC; | |
2820 | } | |
2821 | } | |
2822 | ||
6327eb98 AE |
2823 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2824 | { | |
2825 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2826 | } | |
2827 | ||
f89cef09 AE |
2828 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2829 | { | |
2830 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2831 | } | |
2832 | ||
6327eb98 AE |
2833 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2834 | { | |
2835 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2836 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2837 | /* use extended control field */ |
2838 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2839 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2840 | } else { | |
6327eb98 AE |
2841 | chan->tx_win = min_t(u16, chan->tx_win, |
2842 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2843 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2844 | } | |
c20f8e35 | 2845 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2846 | } |
2847 | ||
710f9b0a | 2848 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2849 | { |
1da177e4 | 2850 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2851 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2852 | void *ptr = req->data; |
c8f79162 | 2853 | u16 size; |
1da177e4 | 2854 | |
49208c9c | 2855 | BT_DBG("chan %p", chan); |
1da177e4 | 2856 | |
73ffa904 | 2857 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2858 | goto done; |
2859 | ||
0c1bc5c6 | 2860 | switch (chan->mode) { |
f2fcfcd6 GP |
2861 | case L2CAP_MODE_STREAMING: |
2862 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2863 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2864 | break; |
85eb53c6 | 2865 | |
f89cef09 AE |
2866 | if (__l2cap_efs_supported(chan)) |
2867 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2868 | ||
2ba13ed6 | 2869 | /* fall through */ |
f2fcfcd6 | 2870 | default: |
8c1d787b | 2871 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2872 | break; |
2873 | } | |
2874 | ||
2875 | done: | |
0c1bc5c6 GP |
2876 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2877 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2878 | |
0c1bc5c6 | 2879 | switch (chan->mode) { |
65c7c491 | 2880 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2881 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2882 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2883 | break; |
2884 | ||
62547752 GP |
2885 | rfc.mode = L2CAP_MODE_BASIC; |
2886 | rfc.txwin_size = 0; | |
2887 | rfc.max_transmit = 0; | |
2888 | rfc.retrans_timeout = 0; | |
2889 | rfc.monitor_timeout = 0; | |
2890 | rfc.max_pdu_size = 0; | |
2891 | ||
63406504 GP |
2892 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2893 | (unsigned long) &rfc); | |
65c7c491 MH |
2894 | break; |
2895 | ||
2896 | case L2CAP_MODE_ERTM: | |
2897 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2898 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2899 | rfc.retrans_timeout = 0; |
2900 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2901 | |
2902 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2903 | L2CAP_EXT_HDR_SIZE - | |
2904 | L2CAP_SDULEN_SIZE - | |
2905 | L2CAP_FCS_SIZE); | |
2906 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2907 | |
6327eb98 AE |
2908 | l2cap_txwin_setup(chan); |
2909 | ||
2910 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2911 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2912 | |
63406504 GP |
2913 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2914 | (unsigned long) &rfc); | |
2915 | ||
f89cef09 AE |
2916 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2917 | l2cap_add_opt_efs(&ptr, chan); | |
2918 | ||
8c1d787b | 2919 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2920 | break; |
2921 | ||
47d1ec61 | 2922 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2923 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2924 | chan->fcs = L2CAP_FCS_NONE; |
2925 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2926 | } |
6327eb98 AE |
2927 | |
2928 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2929 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2930 | chan->tx_win); | |
f2fcfcd6 GP |
2931 | break; |
2932 | ||
2933 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2934 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2935 | rfc.mode = L2CAP_MODE_STREAMING; |
2936 | rfc.txwin_size = 0; | |
2937 | rfc.max_transmit = 0; | |
2938 | rfc.retrans_timeout = 0; | |
2939 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2940 | |
2941 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2942 | L2CAP_EXT_HDR_SIZE - | |
2943 | L2CAP_SDULEN_SIZE - | |
2944 | L2CAP_FCS_SIZE); | |
2945 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2946 | |
63406504 GP |
2947 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2948 | (unsigned long) &rfc); | |
2949 | ||
f89cef09 AE |
2950 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2951 | l2cap_add_opt_efs(&ptr, chan); | |
2952 | ||
8c1d787b | 2953 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2954 | break; |
2955 | ||
47d1ec61 | 2956 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2957 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2958 | chan->fcs = L2CAP_FCS_NONE; |
2959 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2960 | } |
65c7c491 MH |
2961 | break; |
2962 | } | |
1da177e4 | 2963 | |
fe4128e0 | 2964 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2965 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2966 | |
2967 | return ptr - data; | |
2968 | } | |
2969 | ||
73ffa904 | 2970 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2971 | { |
5dee9e7c MH |
2972 | struct l2cap_conf_rsp *rsp = data; |
2973 | void *ptr = rsp->data; | |
73ffa904 GP |
2974 | void *req = chan->conf_req; |
2975 | int len = chan->conf_len; | |
5dee9e7c MH |
2976 | int type, hint, olen; |
2977 | unsigned long val; | |
6464f35f | 2978 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2979 | struct l2cap_conf_efs efs; |
2980 | u8 remote_efs = 0; | |
861d6882 | 2981 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2982 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2983 | u16 size; |
1da177e4 | 2984 | |
73ffa904 | 2985 | BT_DBG("chan %p", chan); |
820ae1b8 | 2986 | |
5dee9e7c MH |
2987 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2988 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2989 | |
589d2746 | 2990 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2991 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2992 | |
2993 | switch (type) { | |
2994 | case L2CAP_CONF_MTU: | |
861d6882 | 2995 | mtu = val; |
5dee9e7c MH |
2996 | break; |
2997 | ||
2998 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2999 | chan->flush_to = val; |
5dee9e7c MH |
3000 | break; |
3001 | ||
3002 | case L2CAP_CONF_QOS: | |
3003 | break; | |
3004 | ||
6464f35f MH |
3005 | case L2CAP_CONF_RFC: |
3006 | if (olen == sizeof(rfc)) | |
3007 | memcpy(&rfc, (void *) val, olen); | |
3008 | break; | |
3009 | ||
fcc203c3 GP |
3010 | case L2CAP_CONF_FCS: |
3011 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3012 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3013 | break; |
fcc203c3 | 3014 | |
42dceae2 AE |
3015 | case L2CAP_CONF_EFS: |
3016 | remote_efs = 1; | |
3017 | if (olen == sizeof(efs)) | |
3018 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3019 | break; |
3020 | ||
6327eb98 AE |
3021 | case L2CAP_CONF_EWS: |
3022 | if (!enable_hs) | |
3023 | return -ECONNREFUSED; | |
fcc203c3 | 3024 | |
6327eb98 AE |
3025 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3026 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3027 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3028 | chan->remote_tx_win = val; |
fcc203c3 GP |
3029 | break; |
3030 | ||
5dee9e7c MH |
3031 | default: |
3032 | if (hint) | |
3033 | break; | |
3034 | ||
3035 | result = L2CAP_CONF_UNKNOWN; | |
3036 | *((u8 *) ptr++) = type; | |
3037 | break; | |
3038 | } | |
3039 | } | |
3040 | ||
73ffa904 | 3041 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3042 | goto done; |
3043 | ||
0c1bc5c6 | 3044 | switch (chan->mode) { |
f2fcfcd6 GP |
3045 | case L2CAP_MODE_STREAMING: |
3046 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3047 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3048 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 3049 | chan->conn->feat_mask); |
85eb53c6 GP |
3050 | break; |
3051 | } | |
3052 | ||
42dceae2 AE |
3053 | if (remote_efs) { |
3054 | if (__l2cap_efs_supported(chan)) | |
3055 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3056 | else | |
3057 | return -ECONNREFUSED; | |
3058 | } | |
3059 | ||
0c1bc5c6 | 3060 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3061 | return -ECONNREFUSED; |
742e519b | 3062 | |
f2fcfcd6 | 3063 | break; |
f2fcfcd6 GP |
3064 | } |
3065 | ||
3066 | done: | |
0c1bc5c6 | 3067 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3068 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3069 | rfc.mode = chan->mode; |
f2fcfcd6 | 3070 | |
73ffa904 | 3071 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3072 | return -ECONNREFUSED; |
3073 | ||
3074 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3075 | sizeof(rfc), (unsigned long) &rfc); | |
3076 | } | |
3077 | ||
5dee9e7c MH |
3078 | if (result == L2CAP_CONF_SUCCESS) { |
3079 | /* Configure output options and let the other side know | |
3080 | * which ones we don't like. */ | |
3081 | ||
f2fcfcd6 GP |
3082 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3083 | result = L2CAP_CONF_UNACCEPT; | |
3084 | else { | |
0c1bc5c6 | 3085 | chan->omtu = mtu; |
c1360a1c | 3086 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3087 | } |
0c1bc5c6 | 3088 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3089 | |
42dceae2 AE |
3090 | if (remote_efs) { |
3091 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3092 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3093 | efs.stype != chan->local_stype) { | |
3094 | ||
3095 | result = L2CAP_CONF_UNACCEPT; | |
3096 | ||
3097 | if (chan->num_conf_req >= 1) | |
3098 | return -ECONNREFUSED; | |
3099 | ||
3100 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3101 | sizeof(efs), |
42dceae2 | 3102 | (unsigned long) &efs); |
0e8b207e | 3103 | } else { |
3e6b3b95 | 3104 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3105 | result = L2CAP_CONF_PENDING; |
3106 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3107 | } |
3108 | } | |
3109 | ||
f2fcfcd6 GP |
3110 | switch (rfc.mode) { |
3111 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3112 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3113 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3114 | break; |
3115 | ||
3116 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3117 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3118 | chan->remote_tx_win = rfc.txwin_size; | |
3119 | else | |
3120 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3121 | |
2c03a7a4 | 3122 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3123 | |
c8f79162 AE |
3124 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3125 | chan->conn->mtu - | |
3126 | L2CAP_EXT_HDR_SIZE - | |
3127 | L2CAP_SDULEN_SIZE - | |
3128 | L2CAP_FCS_SIZE); | |
3129 | rfc.max_pdu_size = cpu_to_le16(size); | |
3130 | chan->remote_mps = size; | |
f2fcfcd6 | 3131 | |
10467e9e | 3132 | rfc.retrans_timeout = |
4fd21a88 | 3133 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3134 | rfc.monitor_timeout = |
4fd21a88 | 3135 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3136 | |
c1360a1c | 3137 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3138 | |
3139 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3140 | sizeof(rfc), (unsigned long) &rfc); | |
3141 | ||
42dceae2 AE |
3142 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3143 | chan->remote_id = efs.id; | |
3144 | chan->remote_stype = efs.stype; | |
3145 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3146 | chan->remote_flush_to = | |
3147 | le32_to_cpu(efs.flush_to); | |
3148 | chan->remote_acc_lat = | |
3149 | le32_to_cpu(efs.acc_lat); | |
3150 | chan->remote_sdu_itime = | |
3151 | le32_to_cpu(efs.sdu_itime); | |
3152 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3153 | sizeof(efs), (unsigned long) &efs); | |
3154 | } | |
f2fcfcd6 GP |
3155 | break; |
3156 | ||
3157 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3158 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3159 | chan->conn->mtu - | |
3160 | L2CAP_EXT_HDR_SIZE - | |
3161 | L2CAP_SDULEN_SIZE - | |
3162 | L2CAP_FCS_SIZE); | |
3163 | rfc.max_pdu_size = cpu_to_le16(size); | |
3164 | chan->remote_mps = size; | |
f2fcfcd6 | 3165 | |
c1360a1c | 3166 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3167 | |
3168 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3169 | sizeof(rfc), (unsigned long) &rfc); | |
3170 | ||
f2fcfcd6 GP |
3171 | break; |
3172 | ||
3173 | default: | |
5dee9e7c | 3174 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3175 | |
6464f35f | 3176 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3177 | rfc.mode = chan->mode; |
f2fcfcd6 | 3178 | } |
6464f35f | 3179 | |
f2fcfcd6 | 3180 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3181 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3182 | } |
fe4128e0 | 3183 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3184 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3185 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3186 | |
3187 | return ptr - data; | |
1da177e4 LT |
3188 | } |
3189 | ||
b4450035 | 3190 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3191 | { |
f2fcfcd6 GP |
3192 | struct l2cap_conf_req *req = data; |
3193 | void *ptr = req->data; | |
3194 | int type, olen; | |
3195 | unsigned long val; | |
36e999a8 | 3196 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3197 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3198 | |
fe4128e0 | 3199 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3200 | |
3201 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3202 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3203 | ||
3204 | switch (type) { | |
3205 | case L2CAP_CONF_MTU: | |
3206 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3207 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3208 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3209 | } else |
0c1bc5c6 GP |
3210 | chan->imtu = val; |
3211 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3212 | break; |
3213 | ||
3214 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3215 | chan->flush_to = val; |
f2fcfcd6 | 3216 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3217 | 2, chan->flush_to); |
f2fcfcd6 GP |
3218 | break; |
3219 | ||
3220 | case L2CAP_CONF_RFC: | |
3221 | if (olen == sizeof(rfc)) | |
3222 | memcpy(&rfc, (void *)val, olen); | |
3223 | ||
c1360a1c | 3224 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3225 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3226 | return -ECONNREFUSED; |
3227 | ||
47d1ec61 | 3228 | chan->fcs = 0; |
f2fcfcd6 GP |
3229 | |
3230 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3231 | sizeof(rfc), (unsigned long) &rfc); | |
3232 | break; | |
6327eb98 AE |
3233 | |
3234 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3235 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3236 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3237 | chan->tx_win); |
6327eb98 | 3238 | break; |
66af7aaf AE |
3239 | |
3240 | case L2CAP_CONF_EFS: | |
3241 | if (olen == sizeof(efs)) | |
3242 | memcpy(&efs, (void *)val, olen); | |
3243 | ||
3244 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3245 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3246 | efs.stype != chan->local_stype) | |
3247 | return -ECONNREFUSED; | |
3248 | ||
3249 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3250 | sizeof(efs), (unsigned long) &efs); | |
3251 | break; | |
f2fcfcd6 GP |
3252 | } |
3253 | } | |
3254 | ||
0c1bc5c6 | 3255 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3256 | return -ECONNREFUSED; |
3257 | ||
0c1bc5c6 | 3258 | chan->mode = rfc.mode; |
6c2ea7a8 | 3259 | |
0e8b207e | 3260 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3261 | switch (rfc.mode) { |
3262 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3263 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3264 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3265 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3266 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3267 | chan->ack_win = min_t(u16, chan->ack_win, | |
3268 | rfc.txwin_size); | |
66af7aaf AE |
3269 | |
3270 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3271 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3272 | chan->local_sdu_itime = | |
3273 | le32_to_cpu(efs.sdu_itime); | |
3274 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3275 | chan->local_flush_to = | |
3276 | le32_to_cpu(efs.flush_to); | |
3277 | } | |
f2fcfcd6 | 3278 | break; |
66af7aaf | 3279 | |
f2fcfcd6 | 3280 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3281 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3282 | } |
3283 | } | |
3284 | ||
fe4128e0 | 3285 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3286 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3287 | |
3288 | return ptr - data; | |
3289 | } | |
3290 | ||
fe4128e0 | 3291 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3292 | { |
3293 | struct l2cap_conf_rsp *rsp = data; | |
3294 | void *ptr = rsp->data; | |
1da177e4 | 3295 | |
fe4128e0 | 3296 | BT_DBG("chan %p", chan); |
1da177e4 | 3297 | |
fe4128e0 | 3298 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3299 | rsp->result = cpu_to_le16(result); |
aca3192c | 3300 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3301 | |
3302 | return ptr - data; | |
3303 | } | |
3304 | ||
8c1d787b | 3305 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3306 | { |
3307 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3308 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3309 | u8 buf[128]; |
3310 | ||
fe4128e0 GP |
3311 | rsp.scid = cpu_to_le16(chan->dcid); |
3312 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3313 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3314 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3315 | l2cap_send_cmd(conn, chan->ident, |
3316 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3317 | ||
c1360a1c | 3318 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3319 | return; |
3320 | ||
710f9b0a GP |
3321 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3322 | l2cap_build_conf_req(chan, buf), buf); | |
3323 | chan->num_conf_req++; | |
3324 | } | |
3325 | ||
47d1ec61 | 3326 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3327 | { |
7b1c0049 GP |
3328 | int type, olen; |
3329 | unsigned long val; | |
c20f8e35 MM |
3330 | /* Use sane default values in case a misbehaving remote device |
3331 | * did not send an RFC or extended window size option. | |
3332 | */ | |
3333 | u16 txwin_ext = chan->ack_win; | |
3334 | struct l2cap_conf_rfc rfc = { | |
3335 | .mode = chan->mode, | |
3336 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3337 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3338 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3339 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3340 | }; | |
7b1c0049 | 3341 | |
47d1ec61 | 3342 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3343 | |
0c1bc5c6 | 3344 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3345 | return; |
3346 | ||
3347 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3348 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3349 | ||
c20f8e35 MM |
3350 | switch (type) { |
3351 | case L2CAP_CONF_RFC: | |
3352 | if (olen == sizeof(rfc)) | |
3353 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3354 | break; |
c20f8e35 MM |
3355 | case L2CAP_CONF_EWS: |
3356 | txwin_ext = val; | |
3357 | break; | |
3358 | } | |
7b1c0049 GP |
3359 | } |
3360 | ||
7b1c0049 GP |
3361 | switch (rfc.mode) { |
3362 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3363 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3364 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3365 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3366 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3367 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3368 | else | |
3369 | chan->ack_win = min_t(u16, chan->ack_win, | |
3370 | rfc.txwin_size); | |
7b1c0049 GP |
3371 | break; |
3372 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3373 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3374 | } |
3375 | } | |
3376 | ||
4e8402a3 MH |
3377 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3378 | { | |
e2fd318e | 3379 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3380 | |
e2fd318e | 3381 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3382 | return 0; |
3383 | ||
3384 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3385 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3386 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3387 | |
3388 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3389 | conn->info_ident = 0; |
984947dc | 3390 | |
4e8402a3 MH |
3391 | l2cap_conn_start(conn); |
3392 | } | |
3393 | ||
3394 | return 0; | |
3395 | } | |
3396 | ||
4c89b6aa MM |
3397 | static void __l2cap_connect(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, |
3398 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3399 | { |
1da177e4 LT |
3400 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3401 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3402 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3403 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3404 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3405 | |
3406 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3407 | __le16 psm = req->psm; |
1da177e4 | 3408 | |
097db76c | 3409 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3410 | |
3411 | /* Check if we have socket listening on psm */ | |
c2287681 | 3412 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3413 | if (!pchan) { |
1da177e4 LT |
3414 | result = L2CAP_CR_BAD_PSM; |
3415 | goto sendresp; | |
3416 | } | |
3417 | ||
23691d75 GP |
3418 | parent = pchan->sk; |
3419 | ||
3df91ea2 | 3420 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3421 | lock_sock(parent); |
e0f0cb56 | 3422 | |
e7c29cb1 | 3423 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3424 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3425 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3426 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3427 | result = L2CAP_CR_SEC_BLOCK; |
3428 | goto response; | |
3429 | } | |
3430 | ||
1da177e4 LT |
3431 | result = L2CAP_CR_NO_MEM; |
3432 | ||
2dfa1003 GP |
3433 | /* Check if we already have channel with that dcid */ |
3434 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3435 | goto response; | |
3436 | ||
80b98027 | 3437 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3438 | if (!chan) |
1da177e4 LT |
3439 | goto response; |
3440 | ||
80808e43 GP |
3441 | sk = chan->sk; |
3442 | ||
1da177e4 LT |
3443 | hci_conn_hold(conn->hcon); |
3444 | ||
1da177e4 LT |
3445 | bacpy(&bt_sk(sk)->src, conn->src); |
3446 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3447 | chan->psm = psm; |
3448 | chan->dcid = scid; | |
1da177e4 | 3449 | |
d1010240 GP |
3450 | bt_accept_enqueue(parent, sk); |
3451 | ||
6be36555 | 3452 | __l2cap_chan_add(conn, chan); |
48454079 | 3453 | |
fe4128e0 | 3454 | dcid = chan->scid; |
1da177e4 | 3455 | |
c9b66675 | 3456 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3457 | |
fc7f8a7e | 3458 | chan->ident = cmd->ident; |
1da177e4 | 3459 | |
984947dc | 3460 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3461 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3462 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3463 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3464 | result = L2CAP_CR_PEND; |
3465 | status = L2CAP_CS_AUTHOR_PEND; | |
3466 | parent->sk_data_ready(parent, 0); | |
3467 | } else { | |
0e587be7 | 3468 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3469 | result = L2CAP_CR_SUCCESS; |
3470 | status = L2CAP_CS_NO_INFO; | |
3471 | } | |
79d554a6 | 3472 | } else { |
0e587be7 | 3473 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3474 | result = L2CAP_CR_PEND; |
3475 | status = L2CAP_CS_AUTHEN_PEND; | |
3476 | } | |
3477 | } else { | |
0e587be7 | 3478 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3479 | result = L2CAP_CR_PEND; |
3480 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3481 | } |
3482 | ||
1da177e4 | 3483 | response: |
aa2ac881 | 3484 | release_sock(parent); |
3df91ea2 | 3485 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3486 | |
3487 | sendresp: | |
aca3192c YH |
3488 | rsp.scid = cpu_to_le16(scid); |
3489 | rsp.dcid = cpu_to_le16(dcid); | |
3490 | rsp.result = cpu_to_le16(result); | |
3491 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3492 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3493 | |
3494 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3495 | struct l2cap_info_req info; | |
ac73498c | 3496 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3497 | |
3498 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3499 | conn->info_ident = l2cap_get_ident(conn); | |
3500 | ||
ba13ccd9 | 3501 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3502 | |
3503 | l2cap_send_cmd(conn, conn->info_ident, | |
3504 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3505 | } | |
3506 | ||
c1360a1c | 3507 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3508 | result == L2CAP_CR_SUCCESS) { |
3509 | u8 buf[128]; | |
c1360a1c | 3510 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3511 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3512 | l2cap_build_conf_req(chan, buf), buf); |
3513 | chan->num_conf_req++; | |
e9aeb2dd | 3514 | } |
4c89b6aa | 3515 | } |
e9aeb2dd | 3516 | |
4c89b6aa MM |
3517 | static int l2cap_connect_req(struct l2cap_conn *conn, |
3518 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3519 | { | |
3520 | __l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); | |
1da177e4 LT |
3521 | return 0; |
3522 | } | |
3523 | ||
3524 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3525 | { | |
3526 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3527 | u16 scid, dcid, result, status; | |
48454079 | 3528 | struct l2cap_chan *chan; |
1da177e4 | 3529 | u8 req[128]; |
3df91ea2 | 3530 | int err; |
1da177e4 LT |
3531 | |
3532 | scid = __le16_to_cpu(rsp->scid); | |
3533 | dcid = __le16_to_cpu(rsp->dcid); | |
3534 | result = __le16_to_cpu(rsp->result); | |
3535 | status = __le16_to_cpu(rsp->status); | |
3536 | ||
1b009c98 AE |
3537 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3538 | dcid, scid, result, status); | |
1da177e4 | 3539 | |
3df91ea2 AE |
3540 | mutex_lock(&conn->chan_lock); |
3541 | ||
1da177e4 | 3542 | if (scid) { |
3df91ea2 AE |
3543 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3544 | if (!chan) { | |
3545 | err = -EFAULT; | |
3546 | goto unlock; | |
3547 | } | |
1da177e4 | 3548 | } else { |
3df91ea2 AE |
3549 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3550 | if (!chan) { | |
3551 | err = -EFAULT; | |
3552 | goto unlock; | |
3553 | } | |
1da177e4 LT |
3554 | } |
3555 | ||
3df91ea2 AE |
3556 | err = 0; |
3557 | ||
6be36555 | 3558 | l2cap_chan_lock(chan); |
48454079 | 3559 | |
1da177e4 LT |
3560 | switch (result) { |
3561 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3562 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3563 | chan->ident = 0; |
fe4128e0 | 3564 | chan->dcid = dcid; |
c1360a1c | 3565 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3566 | |
c1360a1c | 3567 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3568 | break; |
3569 | ||
1da177e4 | 3570 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3571 | l2cap_build_conf_req(chan, req), req); |
3572 | chan->num_conf_req++; | |
1da177e4 LT |
3573 | break; |
3574 | ||
3575 | case L2CAP_CR_PEND: | |
c1360a1c | 3576 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3577 | break; |
3578 | ||
3579 | default: | |
48454079 | 3580 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3581 | break; |
3582 | } | |
3583 | ||
6be36555 | 3584 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3585 | |
3586 | unlock: | |
3587 | mutex_unlock(&conn->chan_lock); | |
3588 | ||
3589 | return err; | |
1da177e4 LT |
3590 | } |
3591 | ||
47d1ec61 | 3592 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3593 | { |
3594 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3595 | * sides request it. | |
3596 | */ | |
0c1bc5c6 | 3597 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3598 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3599 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3600 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3601 | } |
3602 | ||
29d8a590 AE |
3603 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3604 | u8 ident, u16 flags) | |
3605 | { | |
3606 | struct l2cap_conn *conn = chan->conn; | |
3607 | ||
3608 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3609 | flags); | |
3610 | ||
3611 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3612 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3613 | ||
3614 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3615 | l2cap_build_conf_rsp(chan, data, | |
3616 | L2CAP_CONF_SUCCESS, flags), data); | |
3617 | } | |
3618 | ||
88219a0f | 3619 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3620 | { |
3621 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3622 | u16 dcid, flags; | |
3623 | u8 rsp[64]; | |
48454079 | 3624 | struct l2cap_chan *chan; |
3c588192 | 3625 | int len, err = 0; |
1da177e4 LT |
3626 | |
3627 | dcid = __le16_to_cpu(req->dcid); | |
3628 | flags = __le16_to_cpu(req->flags); | |
3629 | ||
3630 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3631 | ||
baa7e1fa | 3632 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3633 | if (!chan) |
1da177e4 LT |
3634 | return -ENOENT; |
3635 | ||
033b1142 | 3636 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3637 | struct l2cap_cmd_rej_cid rej; |
3638 | ||
ac73498c | 3639 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3640 | rej.scid = cpu_to_le16(chan->scid); |
3641 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3642 | |
df6bd743 GP |
3643 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3644 | sizeof(rej), &rej); | |
354f60a9 | 3645 | goto unlock; |
df6bd743 | 3646 | } |
354f60a9 | 3647 | |
5dee9e7c | 3648 | /* Reject if config buffer is too small. */ |
88219a0f | 3649 | len = cmd_len - sizeof(*req); |
7ac28817 | 3650 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3651 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3652 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3653 | L2CAP_CONF_REJECT, flags), rsp); |
3654 | goto unlock; | |
3655 | } | |
3656 | ||
3657 | /* Store config. */ | |
73ffa904 GP |
3658 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3659 | chan->conf_len += len; | |
1da177e4 | 3660 | |
59e54bd1 | 3661 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3662 | /* Incomplete config. Send empty response. */ |
3663 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3664 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3665 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3666 | goto unlock; |
3667 | } | |
3668 | ||
3669 | /* Complete config. */ | |
73ffa904 | 3670 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3671 | if (len < 0) { |
e92c8e70 | 3672 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3673 | goto unlock; |
f2fcfcd6 | 3674 | } |
1da177e4 | 3675 | |
5dee9e7c | 3676 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3677 | chan->num_conf_rsp++; |
5dee9e7c | 3678 | |
5dee9e7c | 3679 | /* Reset config buffer. */ |
73ffa904 | 3680 | chan->conf_len = 0; |
5dee9e7c | 3681 | |
c1360a1c | 3682 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3683 | goto unlock; |
3684 | ||
c1360a1c | 3685 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3686 | set_default_fcs(chan); |
fcc203c3 | 3687 | |
105bdf9e MM |
3688 | if (chan->mode == L2CAP_MODE_ERTM || |
3689 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3690 | err = l2cap_ertm_init(chan); |
3691 | ||
3692 | if (err < 0) | |
3693 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3694 | else | |
3695 | l2cap_chan_ready(chan); | |
0565c1c2 | 3696 | |
876d9484 MH |
3697 | goto unlock; |
3698 | } | |
3699 | ||
c1360a1c | 3700 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3701 | u8 buf[64]; |
1da177e4 | 3702 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3703 | l2cap_build_conf_req(chan, buf), buf); |
3704 | chan->num_conf_req++; | |
1da177e4 LT |
3705 | } |
3706 | ||
0e8b207e AE |
3707 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3708 | Conf Rsp PENDING in the code above */ | |
3709 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 3710 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
3711 | |
3712 | /* check compatibility */ | |
3713 | ||
29d8a590 | 3714 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
0e8b207e AE |
3715 | } |
3716 | ||
1da177e4 | 3717 | unlock: |
6be36555 | 3718 | l2cap_chan_unlock(chan); |
3c588192 | 3719 | return err; |
1da177e4 LT |
3720 | } |
3721 | ||
3722 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3723 | { | |
3724 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3725 | u16 scid, flags, result; | |
48454079 | 3726 | struct l2cap_chan *chan; |
61386cba | 3727 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3728 | int err = 0; |
1da177e4 LT |
3729 | |
3730 | scid = __le16_to_cpu(rsp->scid); | |
3731 | flags = __le16_to_cpu(rsp->flags); | |
3732 | result = __le16_to_cpu(rsp->result); | |
3733 | ||
61386cba AE |
3734 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3735 | result, len); | |
1da177e4 | 3736 | |
baa7e1fa | 3737 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3738 | if (!chan) |
1da177e4 LT |
3739 | return 0; |
3740 | ||
3741 | switch (result) { | |
3742 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3743 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3744 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3745 | break; |
3746 | ||
0e8b207e AE |
3747 | case L2CAP_CONF_PENDING: |
3748 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3749 | ||
3750 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3751 | char buf[64]; | |
3752 | ||
3753 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3754 | buf, &result); | |
3755 | if (len < 0) { | |
3756 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3757 | goto done; | |
3758 | } | |
3759 | ||
3760 | /* check compatibility */ | |
3761 | ||
29d8a590 | 3762 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 0); |
0e8b207e AE |
3763 | } |
3764 | goto done; | |
3765 | ||
1da177e4 | 3766 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3767 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3768 | char req[64]; |
3769 | ||
c2c77ec8 | 3770 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3771 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3772 | goto done; |
3773 | } | |
3774 | ||
f2fcfcd6 GP |
3775 | /* throw out any old stored conf requests */ |
3776 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3777 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3778 | req, &result); | |
f2fcfcd6 | 3779 | if (len < 0) { |
e92c8e70 | 3780 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3781 | goto done; |
3782 | } | |
3783 | ||
3784 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3785 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3786 | chan->num_conf_req++; |
f2fcfcd6 GP |
3787 | if (result != L2CAP_CONF_SUCCESS) |
3788 | goto done; | |
3789 | break; | |
1da177e4 LT |
3790 | } |
3791 | ||
8e87d142 | 3792 | default: |
6be36555 | 3793 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3794 | |
ba13ccd9 | 3795 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3796 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3797 | goto done; |
3798 | } | |
3799 | ||
59e54bd1 | 3800 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3801 | goto done; |
3802 | ||
c1360a1c | 3803 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3804 | |
c1360a1c | 3805 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3806 | set_default_fcs(chan); |
fcc203c3 | 3807 | |
105bdf9e MM |
3808 | if (chan->mode == L2CAP_MODE_ERTM || |
3809 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3810 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3811 | |
3c588192 MM |
3812 | if (err < 0) |
3813 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3814 | else | |
3815 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3816 | } |
3817 | ||
3818 | done: | |
6be36555 | 3819 | l2cap_chan_unlock(chan); |
3c588192 | 3820 | return err; |
1da177e4 LT |
3821 | } |
3822 | ||
3823 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3824 | { | |
3825 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3826 | struct l2cap_disconn_rsp rsp; | |
3827 | u16 dcid, scid; | |
48454079 | 3828 | struct l2cap_chan *chan; |
1da177e4 LT |
3829 | struct sock *sk; |
3830 | ||
3831 | scid = __le16_to_cpu(req->scid); | |
3832 | dcid = __le16_to_cpu(req->dcid); | |
3833 | ||
3834 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3835 | ||
3df91ea2 AE |
3836 | mutex_lock(&conn->chan_lock); |
3837 | ||
3838 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3839 | if (!chan) { | |
3840 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3841 | return 0; |
3df91ea2 | 3842 | } |
1da177e4 | 3843 | |
6be36555 AE |
3844 | l2cap_chan_lock(chan); |
3845 | ||
48454079 GP |
3846 | sk = chan->sk; |
3847 | ||
fe4128e0 GP |
3848 | rsp.dcid = cpu_to_le16(chan->scid); |
3849 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3850 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3851 | ||
6be36555 | 3852 | lock_sock(sk); |
1da177e4 | 3853 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3854 | release_sock(sk); |
1da177e4 | 3855 | |
61d6ef3e | 3856 | l2cap_chan_hold(chan); |
48454079 | 3857 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3858 | |
3859 | l2cap_chan_unlock(chan); | |
1da177e4 | 3860 | |
80b98027 | 3861 | chan->ops->close(chan); |
61d6ef3e | 3862 | l2cap_chan_put(chan); |
3df91ea2 AE |
3863 | |
3864 | mutex_unlock(&conn->chan_lock); | |
3865 | ||
1da177e4 LT |
3866 | return 0; |
3867 | } | |
3868 | ||
3869 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3870 | { | |
3871 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3872 | u16 dcid, scid; | |
48454079 | 3873 | struct l2cap_chan *chan; |
1da177e4 LT |
3874 | |
3875 | scid = __le16_to_cpu(rsp->scid); | |
3876 | dcid = __le16_to_cpu(rsp->dcid); | |
3877 | ||
3878 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3879 | ||
3df91ea2 AE |
3880 | mutex_lock(&conn->chan_lock); |
3881 | ||
3882 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3883 | if (!chan) { | |
3884 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3885 | return 0; |
3df91ea2 | 3886 | } |
1da177e4 | 3887 | |
6be36555 | 3888 | l2cap_chan_lock(chan); |
48454079 | 3889 | |
61d6ef3e | 3890 | l2cap_chan_hold(chan); |
48454079 | 3891 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3892 | |
3893 | l2cap_chan_unlock(chan); | |
1da177e4 | 3894 | |
80b98027 | 3895 | chan->ops->close(chan); |
61d6ef3e | 3896 | l2cap_chan_put(chan); |
3df91ea2 AE |
3897 | |
3898 | mutex_unlock(&conn->chan_lock); | |
3899 | ||
1da177e4 LT |
3900 | return 0; |
3901 | } | |
3902 | ||
3903 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3904 | { | |
3905 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3906 | u16 type; |
3907 | ||
3908 | type = __le16_to_cpu(req->type); | |
3909 | ||
3910 | BT_DBG("type 0x%4.4x", type); | |
3911 | ||
f0709e03 MH |
3912 | if (type == L2CAP_IT_FEAT_MASK) { |
3913 | u8 buf[8]; | |
44dd46de | 3914 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3915 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3916 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3917 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3918 | if (!disable_ertm) |
fcc203c3 GP |
3919 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3920 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3921 | if (enable_hs) |
6327eb98 AE |
3922 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3923 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3924 | |
1b7bf4ed | 3925 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3926 | l2cap_send_cmd(conn, cmd->ident, |
3927 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3928 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3929 | u8 buf[12]; | |
3930 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3931 | |
3932 | if (enable_hs) | |
3933 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3934 | else | |
3935 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3936 | ||
ac73498c AE |
3937 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3938 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3939 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3940 | l2cap_send_cmd(conn, cmd->ident, |
3941 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3942 | } else { |
3943 | struct l2cap_info_rsp rsp; | |
3944 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3945 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3946 | l2cap_send_cmd(conn, cmd->ident, |
3947 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3948 | } | |
1da177e4 LT |
3949 | |
3950 | return 0; | |
3951 | } | |
3952 | ||
3953 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3954 | { | |
3955 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3956 | u16 type, result; | |
3957 | ||
3958 | type = __le16_to_cpu(rsp->type); | |
3959 | result = __le16_to_cpu(rsp->result); | |
3960 | ||
3961 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3962 | ||
e90165be AE |
3963 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3964 | if (cmd->ident != conn->info_ident || | |
3965 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3966 | return 0; | |
3967 | ||
17cd3f37 | 3968 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3969 | |
adb08ede VT |
3970 | if (result != L2CAP_IR_SUCCESS) { |
3971 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3972 | conn->info_ident = 0; | |
3973 | ||
3974 | l2cap_conn_start(conn); | |
3975 | ||
3976 | return 0; | |
3977 | } | |
3978 | ||
978c93b9 AE |
3979 | switch (type) { |
3980 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3981 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3982 | |
47ec1dcd | 3983 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3984 | struct l2cap_info_req req; |
ac73498c | 3985 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3986 | |
3987 | conn->info_ident = l2cap_get_ident(conn); | |
3988 | ||
3989 | l2cap_send_cmd(conn, conn->info_ident, | |
3990 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3991 | } else { | |
3992 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3993 | conn->info_ident = 0; | |
3994 | ||
3995 | l2cap_conn_start(conn); | |
3996 | } | |
978c93b9 AE |
3997 | break; |
3998 | ||
3999 | case L2CAP_IT_FIXED_CHAN: | |
4000 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4001 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4002 | conn->info_ident = 0; |
984947dc MH |
4003 | |
4004 | l2cap_conn_start(conn); | |
978c93b9 | 4005 | break; |
984947dc | 4006 | } |
4e8402a3 | 4007 | |
1da177e4 LT |
4008 | return 0; |
4009 | } | |
4010 | ||
f94ff6ff MM |
4011 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
4012 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4013 | void *data) | |
4014 | { | |
4015 | struct l2cap_create_chan_req *req = data; | |
4016 | struct l2cap_create_chan_rsp rsp; | |
4017 | u16 psm, scid; | |
4018 | ||
4019 | if (cmd_len != sizeof(*req)) | |
4020 | return -EPROTO; | |
4021 | ||
4022 | if (!enable_hs) | |
4023 | return -EINVAL; | |
4024 | ||
4025 | psm = le16_to_cpu(req->psm); | |
4026 | scid = le16_to_cpu(req->scid); | |
4027 | ||
ad0ac6ca | 4028 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff MM |
4029 | |
4030 | /* Placeholder: Always reject */ | |
4031 | rsp.dcid = 0; | |
4032 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
4033 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4034 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
4035 | |
4036 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4037 | sizeof(rsp), &rsp); | |
4038 | ||
4039 | return 0; | |
4040 | } | |
4041 | ||
8d5a04a1 | 4042 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 4043 | u16 icid, u16 result) |
8d5a04a1 MM |
4044 | { |
4045 | struct l2cap_move_chan_rsp rsp; | |
4046 | ||
ad0ac6ca | 4047 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4048 | |
4049 | rsp.icid = cpu_to_le16(icid); | |
4050 | rsp.result = cpu_to_le16(result); | |
4051 | ||
4052 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4053 | } | |
4054 | ||
4055 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4056 | struct l2cap_chan *chan, |
4057 | u16 icid, u16 result) | |
8d5a04a1 MM |
4058 | { |
4059 | struct l2cap_move_chan_cfm cfm; | |
4060 | u8 ident; | |
4061 | ||
ad0ac6ca | 4062 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4063 | |
4064 | ident = l2cap_get_ident(conn); | |
4065 | if (chan) | |
4066 | chan->ident = ident; | |
4067 | ||
4068 | cfm.icid = cpu_to_le16(icid); | |
4069 | cfm.result = cpu_to_le16(result); | |
4070 | ||
4071 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4072 | } | |
4073 | ||
4074 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4075 | u16 icid) |
8d5a04a1 MM |
4076 | { |
4077 | struct l2cap_move_chan_cfm_rsp rsp; | |
4078 | ||
ad0ac6ca | 4079 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4080 | |
4081 | rsp.icid = cpu_to_le16(icid); | |
4082 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4083 | } | |
4084 | ||
4085 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4086 | struct l2cap_cmd_hdr *cmd, |
4087 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4088 | { |
4089 | struct l2cap_move_chan_req *req = data; | |
4090 | u16 icid = 0; | |
4091 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4092 | ||
4093 | if (cmd_len != sizeof(*req)) | |
4094 | return -EPROTO; | |
4095 | ||
4096 | icid = le16_to_cpu(req->icid); | |
4097 | ||
ad0ac6ca | 4098 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4099 | |
4100 | if (!enable_hs) | |
4101 | return -EINVAL; | |
4102 | ||
4103 | /* Placeholder: Always refuse */ | |
4104 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4105 | ||
4106 | return 0; | |
4107 | } | |
4108 | ||
4109 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4110 | struct l2cap_cmd_hdr *cmd, |
4111 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4112 | { |
4113 | struct l2cap_move_chan_rsp *rsp = data; | |
4114 | u16 icid, result; | |
4115 | ||
4116 | if (cmd_len != sizeof(*rsp)) | |
4117 | return -EPROTO; | |
4118 | ||
4119 | icid = le16_to_cpu(rsp->icid); | |
4120 | result = le16_to_cpu(rsp->result); | |
4121 | ||
ad0ac6ca | 4122 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4123 | |
4124 | /* Placeholder: Always unconfirmed */ | |
4125 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4126 | ||
4127 | return 0; | |
4128 | } | |
4129 | ||
4130 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4131 | struct l2cap_cmd_hdr *cmd, |
4132 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4133 | { |
4134 | struct l2cap_move_chan_cfm *cfm = data; | |
4135 | u16 icid, result; | |
4136 | ||
4137 | if (cmd_len != sizeof(*cfm)) | |
4138 | return -EPROTO; | |
4139 | ||
4140 | icid = le16_to_cpu(cfm->icid); | |
4141 | result = le16_to_cpu(cfm->result); | |
4142 | ||
ad0ac6ca | 4143 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4144 | |
4145 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4146 | ||
4147 | return 0; | |
4148 | } | |
4149 | ||
4150 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4151 | struct l2cap_cmd_hdr *cmd, |
4152 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4153 | { |
4154 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4155 | u16 icid; | |
4156 | ||
4157 | if (cmd_len != sizeof(*rsp)) | |
4158 | return -EPROTO; | |
4159 | ||
4160 | icid = le16_to_cpu(rsp->icid); | |
4161 | ||
ad0ac6ca | 4162 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4163 | |
4164 | return 0; | |
4165 | } | |
4166 | ||
e2174ca4 | 4167 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4168 | u16 to_multiplier) |
4169 | { | |
4170 | u16 max_latency; | |
4171 | ||
4172 | if (min > max || min < 6 || max > 3200) | |
4173 | return -EINVAL; | |
4174 | ||
4175 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4176 | return -EINVAL; | |
4177 | ||
4178 | if (max >= to_multiplier * 8) | |
4179 | return -EINVAL; | |
4180 | ||
4181 | max_latency = (to_multiplier * 8 / max) - 1; | |
4182 | if (latency > 499 || latency > max_latency) | |
4183 | return -EINVAL; | |
4184 | ||
4185 | return 0; | |
4186 | } | |
4187 | ||
4188 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4189 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4190 | { | |
4191 | struct hci_conn *hcon = conn->hcon; | |
4192 | struct l2cap_conn_param_update_req *req; | |
4193 | struct l2cap_conn_param_update_rsp rsp; | |
4194 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4195 | int err; |
de73115a CT |
4196 | |
4197 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4198 | return -EINVAL; | |
4199 | ||
4200 | cmd_len = __le16_to_cpu(cmd->len); | |
4201 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4202 | return -EPROTO; | |
4203 | ||
4204 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4205 | min = __le16_to_cpu(req->min); |
4206 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4207 | latency = __le16_to_cpu(req->latency); |
4208 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4209 | ||
4210 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4211 | min, max, latency, to_multiplier); | |
4212 | ||
4213 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4214 | |
4215 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4216 | if (err) | |
ac73498c | 4217 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4218 | else |
ac73498c | 4219 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4220 | |
4221 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4222 | sizeof(rsp), &rsp); | |
4223 | ||
2ce603eb CT |
4224 | if (!err) |
4225 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4226 | ||
de73115a CT |
4227 | return 0; |
4228 | } | |
4229 | ||
3300d9a9 CT |
4230 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4231 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4232 | { | |
4233 | int err = 0; | |
4234 | ||
4235 | switch (cmd->code) { | |
4236 | case L2CAP_COMMAND_REJ: | |
4237 | l2cap_command_rej(conn, cmd, data); | |
4238 | break; | |
4239 | ||
4240 | case L2CAP_CONN_REQ: | |
4241 | err = l2cap_connect_req(conn, cmd, data); | |
4242 | break; | |
4243 | ||
4244 | case L2CAP_CONN_RSP: | |
f5a2598d | 4245 | case L2CAP_CREATE_CHAN_RSP: |
3300d9a9 CT |
4246 | err = l2cap_connect_rsp(conn, cmd, data); |
4247 | break; | |
4248 | ||
4249 | case L2CAP_CONF_REQ: | |
4250 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4251 | break; | |
4252 | ||
4253 | case L2CAP_CONF_RSP: | |
4254 | err = l2cap_config_rsp(conn, cmd, data); | |
4255 | break; | |
4256 | ||
4257 | case L2CAP_DISCONN_REQ: | |
4258 | err = l2cap_disconnect_req(conn, cmd, data); | |
4259 | break; | |
4260 | ||
4261 | case L2CAP_DISCONN_RSP: | |
4262 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4263 | break; | |
4264 | ||
4265 | case L2CAP_ECHO_REQ: | |
4266 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4267 | break; | |
4268 | ||
4269 | case L2CAP_ECHO_RSP: | |
4270 | break; | |
4271 | ||
4272 | case L2CAP_INFO_REQ: | |
4273 | err = l2cap_information_req(conn, cmd, data); | |
4274 | break; | |
4275 | ||
4276 | case L2CAP_INFO_RSP: | |
4277 | err = l2cap_information_rsp(conn, cmd, data); | |
4278 | break; | |
4279 | ||
f94ff6ff MM |
4280 | case L2CAP_CREATE_CHAN_REQ: |
4281 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4282 | break; | |
4283 | ||
8d5a04a1 MM |
4284 | case L2CAP_MOVE_CHAN_REQ: |
4285 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4286 | break; | |
4287 | ||
4288 | case L2CAP_MOVE_CHAN_RSP: | |
4289 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4290 | break; | |
4291 | ||
4292 | case L2CAP_MOVE_CHAN_CFM: | |
4293 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4294 | break; | |
4295 | ||
4296 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4297 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4298 | break; | |
4299 | ||
3300d9a9 CT |
4300 | default: |
4301 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4302 | err = -EINVAL; | |
4303 | break; | |
4304 | } | |
4305 | ||
4306 | return err; | |
4307 | } | |
4308 | ||
4309 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4310 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4311 | { | |
4312 | switch (cmd->code) { | |
4313 | case L2CAP_COMMAND_REJ: | |
4314 | return 0; | |
4315 | ||
4316 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4317 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4318 | |
4319 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4320 | return 0; | |
4321 | ||
4322 | default: | |
4323 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4324 | return -EINVAL; | |
4325 | } | |
4326 | } | |
4327 | ||
4328 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4329 | struct sk_buff *skb) | |
1da177e4 LT |
4330 | { |
4331 | u8 *data = skb->data; | |
4332 | int len = skb->len; | |
4333 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4334 | int err; |
1da177e4 LT |
4335 | |
4336 | l2cap_raw_recv(conn, skb); | |
4337 | ||
4338 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4339 | u16 cmd_len; |
1da177e4 LT |
4340 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4341 | data += L2CAP_CMD_HDR_SIZE; | |
4342 | len -= L2CAP_CMD_HDR_SIZE; | |
4343 | ||
88219a0f | 4344 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4345 | |
88219a0f | 4346 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4347 | |
88219a0f | 4348 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4349 | BT_DBG("corrupted command"); |
4350 | break; | |
4351 | } | |
4352 | ||
3300d9a9 CT |
4353 | if (conn->hcon->type == LE_LINK) |
4354 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4355 | else | |
4356 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4357 | |
4358 | if (err) { | |
e2fd318e | 4359 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4360 | |
4361 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4362 | |
4363 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4364 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4365 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4366 | } | |
4367 | ||
88219a0f AV |
4368 | data += cmd_len; |
4369 | len -= cmd_len; | |
1da177e4 LT |
4370 | } |
4371 | ||
4372 | kfree_skb(skb); | |
4373 | } | |
4374 | ||
47d1ec61 | 4375 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4376 | { |
4377 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4378 | int hdr_size; |
4379 | ||
4380 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4381 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4382 | else | |
4383 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4384 | |
47d1ec61 | 4385 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4386 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4387 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4388 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4389 | ||
4390 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4391 | return -EBADMSG; |
fcc203c3 GP |
4392 | } |
4393 | return 0; | |
4394 | } | |
4395 | ||
6ea00485 | 4396 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4397 | { |
e31f7633 | 4398 | struct l2cap_ctrl control; |
d5392c8f | 4399 | |
e31f7633 | 4400 | BT_DBG("chan %p", chan); |
d5392c8f | 4401 | |
e31f7633 MM |
4402 | memset(&control, 0, sizeof(control)); |
4403 | control.sframe = 1; | |
4404 | control.final = 1; | |
4405 | control.reqseq = chan->buffer_seq; | |
4406 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4407 | |
e2ab4353 | 4408 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4409 | control.super = L2CAP_SUPER_RNR; |
4410 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4411 | } |
4412 | ||
e31f7633 MM |
4413 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4414 | chan->unacked_frames > 0) | |
4415 | __set_retrans_timer(chan); | |
d5392c8f | 4416 | |
e31f7633 | 4417 | /* Send pending iframes */ |
525cd185 | 4418 | l2cap_ertm_send(chan); |
d5392c8f | 4419 | |
e2ab4353 | 4420 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4421 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4422 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4423 | * send it now. | |
4424 | */ | |
4425 | control.super = L2CAP_SUPER_RR; | |
4426 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4427 | } |
4428 | } | |
4429 | ||
84084a31 MM |
4430 | static void append_skb_frag(struct sk_buff *skb, |
4431 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4432 | { |
84084a31 MM |
4433 | /* skb->len reflects data in skb as well as all fragments |
4434 | * skb->data_len reflects only data in fragments | |
4435 | */ | |
4436 | if (!skb_has_frag_list(skb)) | |
4437 | skb_shinfo(skb)->frag_list = new_frag; | |
4438 | ||
4439 | new_frag->next = NULL; | |
4440 | ||
4441 | (*last_frag)->next = new_frag; | |
4442 | *last_frag = new_frag; | |
4443 | ||
4444 | skb->len += new_frag->len; | |
4445 | skb->data_len += new_frag->len; | |
4446 | skb->truesize += new_frag->truesize; | |
4447 | } | |
4448 | ||
4b51dae9 MM |
4449 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4450 | struct l2cap_ctrl *control) | |
84084a31 MM |
4451 | { |
4452 | int err = -EINVAL; | |
18778a63 | 4453 | |
4b51dae9 | 4454 | switch (control->sar) { |
7e0ef6ee | 4455 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4456 | if (chan->sdu) |
4457 | break; | |
18778a63 | 4458 | |
80b98027 | 4459 | err = chan->ops->recv(chan, skb); |
84084a31 | 4460 | break; |
18778a63 | 4461 | |
7e0ef6ee | 4462 | case L2CAP_SAR_START: |
84084a31 MM |
4463 | if (chan->sdu) |
4464 | break; | |
18778a63 | 4465 | |
6f61fd47 | 4466 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4467 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4468 | |
84084a31 MM |
4469 | if (chan->sdu_len > chan->imtu) { |
4470 | err = -EMSGSIZE; | |
4471 | break; | |
4472 | } | |
1890d36b | 4473 | |
84084a31 MM |
4474 | if (skb->len >= chan->sdu_len) |
4475 | break; | |
18778a63 | 4476 | |
84084a31 MM |
4477 | chan->sdu = skb; |
4478 | chan->sdu_last_frag = skb; | |
18778a63 | 4479 | |
84084a31 MM |
4480 | skb = NULL; |
4481 | err = 0; | |
18778a63 GP |
4482 | break; |
4483 | ||
7e0ef6ee | 4484 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4485 | if (!chan->sdu) |
84084a31 | 4486 | break; |
18778a63 | 4487 | |
84084a31 MM |
4488 | append_skb_frag(chan->sdu, skb, |
4489 | &chan->sdu_last_frag); | |
4490 | skb = NULL; | |
18778a63 | 4491 | |
84084a31 MM |
4492 | if (chan->sdu->len >= chan->sdu_len) |
4493 | break; | |
4178ba46 | 4494 | |
84084a31 | 4495 | err = 0; |
18778a63 GP |
4496 | break; |
4497 | ||
7e0ef6ee | 4498 | case L2CAP_SAR_END: |
6f61fd47 | 4499 | if (!chan->sdu) |
84084a31 | 4500 | break; |
18778a63 | 4501 | |
84084a31 MM |
4502 | append_skb_frag(chan->sdu, skb, |
4503 | &chan->sdu_last_frag); | |
4504 | skb = NULL; | |
4178ba46 | 4505 | |
84084a31 MM |
4506 | if (chan->sdu->len != chan->sdu_len) |
4507 | break; | |
18778a63 | 4508 | |
80b98027 | 4509 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4510 | |
84084a31 MM |
4511 | if (!err) { |
4512 | /* Reassembly complete */ | |
4513 | chan->sdu = NULL; | |
4514 | chan->sdu_last_frag = NULL; | |
4515 | chan->sdu_len = 0; | |
1890d36b | 4516 | } |
18778a63 GP |
4517 | break; |
4518 | } | |
4519 | ||
84084a31 MM |
4520 | if (err) { |
4521 | kfree_skb(skb); | |
4522 | kfree_skb(chan->sdu); | |
4523 | chan->sdu = NULL; | |
4524 | chan->sdu_last_frag = NULL; | |
4525 | chan->sdu_len = 0; | |
4526 | } | |
18778a63 | 4527 | |
84084a31 | 4528 | return err; |
18778a63 GP |
4529 | } |
4530 | ||
61aa4f5b | 4531 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4532 | { |
61aa4f5b | 4533 | u8 event; |
712132eb | 4534 | |
61aa4f5b MM |
4535 | if (chan->mode != L2CAP_MODE_ERTM) |
4536 | return; | |
712132eb | 4537 | |
61aa4f5b | 4538 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4539 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4540 | } |
4541 | ||
d2a7ac5d MM |
4542 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4543 | { | |
63838725 MM |
4544 | int err = 0; |
4545 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4546 | * until a gap is encountered. | |
4547 | */ | |
4548 | ||
4549 | BT_DBG("chan %p", chan); | |
4550 | ||
4551 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4552 | struct sk_buff *skb; | |
4553 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4554 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4555 | ||
4556 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4557 | ||
4558 | if (!skb) | |
4559 | break; | |
4560 | ||
4561 | skb_unlink(skb, &chan->srej_q); | |
4562 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4563 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4564 | if (err) | |
4565 | break; | |
4566 | } | |
4567 | ||
4568 | if (skb_queue_empty(&chan->srej_q)) { | |
4569 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4570 | l2cap_send_ack(chan); | |
4571 | } | |
4572 | ||
4573 | return err; | |
d2a7ac5d MM |
4574 | } |
4575 | ||
4576 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4577 | struct l2cap_ctrl *control) | |
4578 | { | |
f80842a8 MM |
4579 | struct sk_buff *skb; |
4580 | ||
4581 | BT_DBG("chan %p, control %p", chan, control); | |
4582 | ||
4583 | if (control->reqseq == chan->next_tx_seq) { | |
4584 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4585 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4586 | return; | |
4587 | } | |
4588 | ||
4589 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4590 | ||
4591 | if (skb == NULL) { | |
4592 | BT_DBG("Seq %d not available for retransmission", | |
4593 | control->reqseq); | |
4594 | return; | |
4595 | } | |
4596 | ||
4597 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4598 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4599 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4600 | return; | |
4601 | } | |
4602 | ||
4603 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4604 | ||
4605 | if (control->poll) { | |
4606 | l2cap_pass_to_tx(chan, control); | |
4607 | ||
4608 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4609 | l2cap_retransmit(chan, control); | |
4610 | l2cap_ertm_send(chan); | |
4611 | ||
4612 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4613 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4614 | chan->srej_save_reqseq = control->reqseq; | |
4615 | } | |
4616 | } else { | |
4617 | l2cap_pass_to_tx_fbit(chan, control); | |
4618 | ||
4619 | if (control->final) { | |
4620 | if (chan->srej_save_reqseq != control->reqseq || | |
4621 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4622 | &chan->conn_state)) | |
4623 | l2cap_retransmit(chan, control); | |
4624 | } else { | |
4625 | l2cap_retransmit(chan, control); | |
4626 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4627 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4628 | chan->srej_save_reqseq = control->reqseq; | |
4629 | } | |
4630 | } | |
4631 | } | |
d2a7ac5d MM |
4632 | } |
4633 | ||
4634 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4635 | struct l2cap_ctrl *control) | |
4636 | { | |
fcd289df MM |
4637 | struct sk_buff *skb; |
4638 | ||
4639 | BT_DBG("chan %p, control %p", chan, control); | |
4640 | ||
4641 | if (control->reqseq == chan->next_tx_seq) { | |
4642 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4643 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4644 | return; | |
4645 | } | |
4646 | ||
4647 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4648 | ||
4649 | if (chan->max_tx && skb && | |
4650 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4651 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4652 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4653 | return; | |
4654 | } | |
4655 | ||
4656 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4657 | ||
4658 | l2cap_pass_to_tx(chan, control); | |
4659 | ||
4660 | if (control->final) { | |
4661 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4662 | l2cap_retransmit_all(chan, control); | |
4663 | } else { | |
4664 | l2cap_retransmit_all(chan, control); | |
4665 | l2cap_ertm_send(chan); | |
4666 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4667 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4668 | } | |
d2a7ac5d MM |
4669 | } |
4670 | ||
4b51dae9 MM |
4671 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4672 | { | |
4673 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4674 | ||
4675 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4676 | chan->expected_tx_seq); | |
4677 | ||
4678 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4679 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4680 | chan->tx_win) { | |
4681 | /* See notes below regarding "double poll" and | |
4682 | * invalid packets. | |
4683 | */ | |
4684 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4685 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4686 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4687 | } else { | |
4688 | BT_DBG("Invalid - in window after SREJ sent"); | |
4689 | return L2CAP_TXSEQ_INVALID; | |
4690 | } | |
4691 | } | |
4692 | ||
4693 | if (chan->srej_list.head == txseq) { | |
4694 | BT_DBG("Expected SREJ"); | |
4695 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4696 | } | |
4697 | ||
4698 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4699 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4700 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4701 | } | |
4702 | ||
4703 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4704 | BT_DBG("Unexpected SREJ - not requested"); | |
4705 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4706 | } | |
4707 | } | |
4708 | ||
4709 | if (chan->expected_tx_seq == txseq) { | |
4710 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4711 | chan->tx_win) { | |
4712 | BT_DBG("Invalid - txseq outside tx window"); | |
4713 | return L2CAP_TXSEQ_INVALID; | |
4714 | } else { | |
4715 | BT_DBG("Expected"); | |
4716 | return L2CAP_TXSEQ_EXPECTED; | |
4717 | } | |
4718 | } | |
4719 | ||
4720 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4721 | __seq_offset(chan, chan->expected_tx_seq, | |
4722 | chan->last_acked_seq)){ | |
4723 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4724 | return L2CAP_TXSEQ_DUPLICATE; | |
4725 | } | |
4726 | ||
4727 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4728 | /* A source of invalid packets is a "double poll" condition, | |
4729 | * where delays cause us to send multiple poll packets. If | |
4730 | * the remote stack receives and processes both polls, | |
4731 | * sequence numbers can wrap around in such a way that a | |
4732 | * resent frame has a sequence number that looks like new data | |
4733 | * with a sequence gap. This would trigger an erroneous SREJ | |
4734 | * request. | |
4735 | * | |
4736 | * Fortunately, this is impossible with a tx window that's | |
4737 | * less than half of the maximum sequence number, which allows | |
4738 | * invalid frames to be safely ignored. | |
4739 | * | |
4740 | * With tx window sizes greater than half of the tx window | |
4741 | * maximum, the frame is invalid and cannot be ignored. This | |
4742 | * causes a disconnect. | |
4743 | */ | |
4744 | ||
4745 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4746 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4747 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4748 | } else { | |
4749 | BT_DBG("Invalid - txseq outside tx window"); | |
4750 | return L2CAP_TXSEQ_INVALID; | |
4751 | } | |
4752 | } else { | |
4753 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4754 | return L2CAP_TXSEQ_UNEXPECTED; | |
4755 | } | |
4756 | } | |
4757 | ||
d2a7ac5d MM |
4758 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4759 | struct l2cap_ctrl *control, | |
4760 | struct sk_buff *skb, u8 event) | |
4761 | { | |
4762 | int err = 0; | |
4763 | bool skb_in_use = 0; | |
4764 | ||
4765 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4766 | event); | |
4767 | ||
4768 | switch (event) { | |
4769 | case L2CAP_EV_RECV_IFRAME: | |
4770 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4771 | case L2CAP_TXSEQ_EXPECTED: | |
4772 | l2cap_pass_to_tx(chan, control); | |
4773 | ||
4774 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4775 | BT_DBG("Busy, discarding expected seq %d", | |
4776 | control->txseq); | |
4777 | break; | |
4778 | } | |
4779 | ||
4780 | chan->expected_tx_seq = __next_seq(chan, | |
4781 | control->txseq); | |
4782 | ||
4783 | chan->buffer_seq = chan->expected_tx_seq; | |
4784 | skb_in_use = 1; | |
4785 | ||
4786 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4787 | if (err) | |
4788 | break; | |
4789 | ||
4790 | if (control->final) { | |
4791 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4792 | &chan->conn_state)) { | |
4793 | control->final = 0; | |
4794 | l2cap_retransmit_all(chan, control); | |
4795 | l2cap_ertm_send(chan); | |
4796 | } | |
4797 | } | |
4798 | ||
4799 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4800 | l2cap_send_ack(chan); | |
4801 | break; | |
4802 | case L2CAP_TXSEQ_UNEXPECTED: | |
4803 | l2cap_pass_to_tx(chan, control); | |
4804 | ||
4805 | /* Can't issue SREJ frames in the local busy state. | |
4806 | * Drop this frame, it will be seen as missing | |
4807 | * when local busy is exited. | |
4808 | */ | |
4809 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4810 | BT_DBG("Busy, discarding unexpected seq %d", | |
4811 | control->txseq); | |
4812 | break; | |
4813 | } | |
4814 | ||
4815 | /* There was a gap in the sequence, so an SREJ | |
4816 | * must be sent for each missing frame. The | |
4817 | * current frame is stored for later use. | |
4818 | */ | |
4819 | skb_queue_tail(&chan->srej_q, skb); | |
4820 | skb_in_use = 1; | |
4821 | BT_DBG("Queued %p (queue len %d)", skb, | |
4822 | skb_queue_len(&chan->srej_q)); | |
4823 | ||
4824 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4825 | l2cap_seq_list_clear(&chan->srej_list); | |
4826 | l2cap_send_srej(chan, control->txseq); | |
4827 | ||
4828 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4829 | break; | |
4830 | case L2CAP_TXSEQ_DUPLICATE: | |
4831 | l2cap_pass_to_tx(chan, control); | |
4832 | break; | |
4833 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4834 | break; | |
4835 | case L2CAP_TXSEQ_INVALID: | |
4836 | default: | |
4837 | l2cap_send_disconn_req(chan->conn, chan, | |
4838 | ECONNRESET); | |
4839 | break; | |
4840 | } | |
4841 | break; | |
4842 | case L2CAP_EV_RECV_RR: | |
4843 | l2cap_pass_to_tx(chan, control); | |
4844 | if (control->final) { | |
4845 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4846 | ||
4847 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4848 | &chan->conn_state)) { | |
4849 | control->final = 0; | |
4850 | l2cap_retransmit_all(chan, control); | |
4851 | } | |
4852 | ||
4853 | l2cap_ertm_send(chan); | |
4854 | } else if (control->poll) { | |
4855 | l2cap_send_i_or_rr_or_rnr(chan); | |
4856 | } else { | |
4857 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4858 | &chan->conn_state) && | |
4859 | chan->unacked_frames) | |
4860 | __set_retrans_timer(chan); | |
4861 | ||
4862 | l2cap_ertm_send(chan); | |
4863 | } | |
4864 | break; | |
4865 | case L2CAP_EV_RECV_RNR: | |
4866 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4867 | l2cap_pass_to_tx(chan, control); | |
4868 | if (control && control->poll) { | |
4869 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4870 | l2cap_send_rr_or_rnr(chan, 0); | |
4871 | } | |
4872 | __clear_retrans_timer(chan); | |
4873 | l2cap_seq_list_clear(&chan->retrans_list); | |
4874 | break; | |
4875 | case L2CAP_EV_RECV_REJ: | |
4876 | l2cap_handle_rej(chan, control); | |
4877 | break; | |
4878 | case L2CAP_EV_RECV_SREJ: | |
4879 | l2cap_handle_srej(chan, control); | |
4880 | break; | |
4881 | default: | |
4882 | break; | |
4883 | } | |
4884 | ||
4885 | if (skb && !skb_in_use) { | |
4886 | BT_DBG("Freeing %p", skb); | |
4887 | kfree_skb(skb); | |
4888 | } | |
4889 | ||
4890 | return err; | |
4891 | } | |
4892 | ||
4893 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4894 | struct l2cap_ctrl *control, | |
4895 | struct sk_buff *skb, u8 event) | |
4896 | { | |
4897 | int err = 0; | |
4898 | u16 txseq = control->txseq; | |
4899 | bool skb_in_use = 0; | |
4900 | ||
4901 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4902 | event); | |
4903 | ||
4904 | switch (event) { | |
4905 | case L2CAP_EV_RECV_IFRAME: | |
4906 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4907 | case L2CAP_TXSEQ_EXPECTED: | |
4908 | /* Keep frame for reassembly later */ | |
4909 | l2cap_pass_to_tx(chan, control); | |
4910 | skb_queue_tail(&chan->srej_q, skb); | |
4911 | skb_in_use = 1; | |
4912 | BT_DBG("Queued %p (queue len %d)", skb, | |
4913 | skb_queue_len(&chan->srej_q)); | |
4914 | ||
4915 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4916 | break; | |
4917 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4918 | l2cap_seq_list_pop(&chan->srej_list); | |
4919 | ||
4920 | l2cap_pass_to_tx(chan, control); | |
4921 | skb_queue_tail(&chan->srej_q, skb); | |
4922 | skb_in_use = 1; | |
4923 | BT_DBG("Queued %p (queue len %d)", skb, | |
4924 | skb_queue_len(&chan->srej_q)); | |
4925 | ||
4926 | err = l2cap_rx_queued_iframes(chan); | |
4927 | if (err) | |
4928 | break; | |
4929 | ||
4930 | break; | |
4931 | case L2CAP_TXSEQ_UNEXPECTED: | |
4932 | /* Got a frame that can't be reassembled yet. | |
4933 | * Save it for later, and send SREJs to cover | |
4934 | * the missing frames. | |
4935 | */ | |
4936 | skb_queue_tail(&chan->srej_q, skb); | |
4937 | skb_in_use = 1; | |
4938 | BT_DBG("Queued %p (queue len %d)", skb, | |
4939 | skb_queue_len(&chan->srej_q)); | |
4940 | ||
4941 | l2cap_pass_to_tx(chan, control); | |
4942 | l2cap_send_srej(chan, control->txseq); | |
4943 | break; | |
4944 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4945 | /* This frame was requested with an SREJ, but | |
4946 | * some expected retransmitted frames are | |
4947 | * missing. Request retransmission of missing | |
4948 | * SREJ'd frames. | |
4949 | */ | |
4950 | skb_queue_tail(&chan->srej_q, skb); | |
4951 | skb_in_use = 1; | |
4952 | BT_DBG("Queued %p (queue len %d)", skb, | |
4953 | skb_queue_len(&chan->srej_q)); | |
4954 | ||
4955 | l2cap_pass_to_tx(chan, control); | |
4956 | l2cap_send_srej_list(chan, control->txseq); | |
4957 | break; | |
4958 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4959 | /* We've already queued this frame. Drop this copy. */ | |
4960 | l2cap_pass_to_tx(chan, control); | |
4961 | break; | |
4962 | case L2CAP_TXSEQ_DUPLICATE: | |
4963 | /* Expecting a later sequence number, so this frame | |
4964 | * was already received. Ignore it completely. | |
4965 | */ | |
4966 | break; | |
4967 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4968 | break; | |
4969 | case L2CAP_TXSEQ_INVALID: | |
4970 | default: | |
4971 | l2cap_send_disconn_req(chan->conn, chan, | |
4972 | ECONNRESET); | |
4973 | break; | |
4974 | } | |
4975 | break; | |
4976 | case L2CAP_EV_RECV_RR: | |
4977 | l2cap_pass_to_tx(chan, control); | |
4978 | if (control->final) { | |
4979 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4980 | ||
4981 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4982 | &chan->conn_state)) { | |
4983 | control->final = 0; | |
4984 | l2cap_retransmit_all(chan, control); | |
4985 | } | |
4986 | ||
4987 | l2cap_ertm_send(chan); | |
4988 | } else if (control->poll) { | |
4989 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4990 | &chan->conn_state) && | |
4991 | chan->unacked_frames) { | |
4992 | __set_retrans_timer(chan); | |
4993 | } | |
4994 | ||
4995 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4996 | l2cap_send_srej_tail(chan); | |
4997 | } else { | |
4998 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4999 | &chan->conn_state) && | |
5000 | chan->unacked_frames) | |
5001 | __set_retrans_timer(chan); | |
5002 | ||
5003 | l2cap_send_ack(chan); | |
5004 | } | |
5005 | break; | |
5006 | case L2CAP_EV_RECV_RNR: | |
5007 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5008 | l2cap_pass_to_tx(chan, control); | |
5009 | if (control->poll) { | |
5010 | l2cap_send_srej_tail(chan); | |
5011 | } else { | |
5012 | struct l2cap_ctrl rr_control; | |
5013 | memset(&rr_control, 0, sizeof(rr_control)); | |
5014 | rr_control.sframe = 1; | |
5015 | rr_control.super = L2CAP_SUPER_RR; | |
5016 | rr_control.reqseq = chan->buffer_seq; | |
5017 | l2cap_send_sframe(chan, &rr_control); | |
5018 | } | |
5019 | ||
5020 | break; | |
5021 | case L2CAP_EV_RECV_REJ: | |
5022 | l2cap_handle_rej(chan, control); | |
5023 | break; | |
5024 | case L2CAP_EV_RECV_SREJ: | |
5025 | l2cap_handle_srej(chan, control); | |
5026 | break; | |
5027 | } | |
5028 | ||
5029 | if (skb && !skb_in_use) { | |
5030 | BT_DBG("Freeing %p", skb); | |
5031 | kfree_skb(skb); | |
5032 | } | |
5033 | ||
5034 | return err; | |
5035 | } | |
5036 | ||
5037 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5038 | { | |
5039 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5040 | u16 unacked; | |
5041 | ||
5042 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5043 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5044 | } | |
5045 | ||
cec8ab6e MM |
5046 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5047 | struct sk_buff *skb, u8 event) | |
218bb9df | 5048 | { |
d2a7ac5d MM |
5049 | int err = 0; |
5050 | ||
5051 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5052 | control, skb, event, chan->rx_state); | |
5053 | ||
5054 | if (__valid_reqseq(chan, control->reqseq)) { | |
5055 | switch (chan->rx_state) { | |
5056 | case L2CAP_RX_STATE_RECV: | |
5057 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5058 | break; | |
5059 | case L2CAP_RX_STATE_SREJ_SENT: | |
5060 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5061 | event); | |
5062 | break; | |
5063 | default: | |
5064 | /* shut it down */ | |
5065 | break; | |
5066 | } | |
5067 | } else { | |
5068 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5069 | control->reqseq, chan->next_tx_seq, | |
5070 | chan->expected_ack_seq); | |
5071 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5072 | } | |
5073 | ||
5074 | return err; | |
cec8ab6e MM |
5075 | } |
5076 | ||
5077 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5078 | struct sk_buff *skb) | |
5079 | { | |
4b51dae9 MM |
5080 | int err = 0; |
5081 | ||
5082 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5083 | chan->rx_state); | |
5084 | ||
5085 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5086 | L2CAP_TXSEQ_EXPECTED) { | |
5087 | l2cap_pass_to_tx(chan, control); | |
5088 | ||
5089 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5090 | __next_seq(chan, chan->buffer_seq)); | |
5091 | ||
5092 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5093 | ||
5094 | l2cap_reassemble_sdu(chan, skb, control); | |
5095 | } else { | |
5096 | if (chan->sdu) { | |
5097 | kfree_skb(chan->sdu); | |
5098 | chan->sdu = NULL; | |
5099 | } | |
5100 | chan->sdu_last_frag = NULL; | |
5101 | chan->sdu_len = 0; | |
5102 | ||
5103 | if (skb) { | |
5104 | BT_DBG("Freeing %p", skb); | |
5105 | kfree_skb(skb); | |
5106 | } | |
5107 | } | |
5108 | ||
5109 | chan->last_acked_seq = control->txseq; | |
5110 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5111 | ||
5112 | return err; | |
cec8ab6e MM |
5113 | } |
5114 | ||
5115 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5116 | { | |
5117 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5118 | u16 len; | |
5119 | u8 event; | |
218bb9df | 5120 | |
b76bbd66 MM |
5121 | __unpack_control(chan, skb); |
5122 | ||
218bb9df GP |
5123 | len = skb->len; |
5124 | ||
5125 | /* | |
5126 | * We can just drop the corrupted I-frame here. | |
5127 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5128 | * procedures and ask for retransmission. |
218bb9df | 5129 | */ |
47d1ec61 | 5130 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5131 | goto drop; |
5132 | ||
cec8ab6e | 5133 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5134 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5135 | |
47d1ec61 | 5136 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5137 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5138 | |
47d1ec61 | 5139 | if (len > chan->mps) { |
8c1d787b | 5140 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5141 | goto drop; |
5142 | } | |
5143 | ||
cec8ab6e MM |
5144 | if (!control->sframe) { |
5145 | int err; | |
218bb9df | 5146 | |
cec8ab6e MM |
5147 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5148 | control->sar, control->reqseq, control->final, | |
5149 | control->txseq); | |
218bb9df | 5150 | |
cec8ab6e MM |
5151 | /* Validate F-bit - F=0 always valid, F=1 only |
5152 | * valid in TX WAIT_F | |
5153 | */ | |
5154 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5155 | goto drop; |
cec8ab6e MM |
5156 | |
5157 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5158 | event = L2CAP_EV_RECV_IFRAME; | |
5159 | err = l2cap_rx(chan, control, skb, event); | |
5160 | } else { | |
5161 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5162 | } |
5163 | ||
cec8ab6e MM |
5164 | if (err) |
5165 | l2cap_send_disconn_req(chan->conn, chan, | |
5166 | ECONNRESET); | |
218bb9df | 5167 | } else { |
cec8ab6e MM |
5168 | const u8 rx_func_to_event[4] = { |
5169 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5170 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5171 | }; | |
5172 | ||
5173 | /* Only I-frames are expected in streaming mode */ | |
5174 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5175 | goto drop; | |
5176 | ||
5177 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5178 | control->reqseq, control->final, control->poll, | |
5179 | control->super); | |
5180 | ||
218bb9df GP |
5181 | if (len != 0) { |
5182 | BT_ERR("%d", len); | |
8c1d787b | 5183 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5184 | goto drop; |
5185 | } | |
5186 | ||
cec8ab6e MM |
5187 | /* Validate F and P bits */ |
5188 | if (control->final && (control->poll || | |
5189 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5190 | goto drop; | |
5191 | ||
5192 | event = rx_func_to_event[control->super]; | |
5193 | if (l2cap_rx(chan, control, skb, event)) | |
5194 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5195 | } |
5196 | ||
5197 | return 0; | |
5198 | ||
5199 | drop: | |
5200 | kfree_skb(skb); | |
5201 | return 0; | |
5202 | } | |
5203 | ||
13ca56e0 AE |
5204 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5205 | struct sk_buff *skb) | |
1da177e4 | 5206 | { |
48454079 | 5207 | struct l2cap_chan *chan; |
1da177e4 | 5208 | |
baa7e1fa | 5209 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5210 | if (!chan) { |
97e8e89d AE |
5211 | if (cid == L2CAP_CID_A2MP) { |
5212 | chan = a2mp_channel_create(conn, skb); | |
5213 | if (!chan) { | |
5214 | kfree_skb(skb); | |
13ca56e0 | 5215 | return; |
97e8e89d AE |
5216 | } |
5217 | ||
5218 | l2cap_chan_lock(chan); | |
5219 | } else { | |
5220 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5221 | /* Drop packet and return */ | |
5222 | kfree_skb(skb); | |
13ca56e0 | 5223 | return; |
97e8e89d | 5224 | } |
1da177e4 LT |
5225 | } |
5226 | ||
49208c9c | 5227 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5228 | |
89bc500e | 5229 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5230 | goto drop; |
5231 | ||
0c1bc5c6 | 5232 | switch (chan->mode) { |
1c2acffb GP |
5233 | case L2CAP_MODE_BASIC: |
5234 | /* If socket recv buffers overflows we drop data here | |
5235 | * which is *bad* because L2CAP has to be reliable. | |
5236 | * But we don't have any other choice. L2CAP doesn't | |
5237 | * provide flow control mechanism. */ | |
1da177e4 | 5238 | |
0c1bc5c6 | 5239 | if (chan->imtu < skb->len) |
1c2acffb | 5240 | goto drop; |
1da177e4 | 5241 | |
80b98027 | 5242 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5243 | goto done; |
5244 | break; | |
5245 | ||
5246 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5247 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5248 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5249 | goto done; |
5250 | ||
1c2acffb | 5251 | default: |
0c1bc5c6 | 5252 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5253 | break; |
5254 | } | |
1da177e4 LT |
5255 | |
5256 | drop: | |
5257 | kfree_skb(skb); | |
5258 | ||
5259 | done: | |
6be36555 | 5260 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5261 | } |
5262 | ||
84104b24 AE |
5263 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5264 | struct sk_buff *skb) | |
1da177e4 | 5265 | { |
23691d75 | 5266 | struct l2cap_chan *chan; |
1da177e4 | 5267 | |
c2287681 | 5268 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5269 | if (!chan) |
1da177e4 LT |
5270 | goto drop; |
5271 | ||
5b4cedaa | 5272 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5273 | |
89bc500e | 5274 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5275 | goto drop; |
5276 | ||
e13e21dc | 5277 | if (chan->imtu < skb->len) |
1da177e4 LT |
5278 | goto drop; |
5279 | ||
80b98027 | 5280 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5281 | return; |
1da177e4 LT |
5282 | |
5283 | drop: | |
5284 | kfree_skb(skb); | |
1da177e4 LT |
5285 | } |
5286 | ||
6810fca7 AE |
5287 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5288 | struct sk_buff *skb) | |
9f69bda6 | 5289 | { |
23691d75 | 5290 | struct l2cap_chan *chan; |
9f69bda6 | 5291 | |
c2287681 | 5292 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5293 | if (!chan) |
9f69bda6 GP |
5294 | goto drop; |
5295 | ||
5b4cedaa | 5296 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5297 | |
89bc500e | 5298 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5299 | goto drop; |
5300 | ||
e13e21dc | 5301 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5302 | goto drop; |
5303 | ||
80b98027 | 5304 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5305 | return; |
9f69bda6 GP |
5306 | |
5307 | drop: | |
5308 | kfree_skb(skb); | |
9f69bda6 GP |
5309 | } |
5310 | ||
1da177e4 LT |
5311 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5312 | { | |
5313 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5314 | u16 cid, len; |
5315 | __le16 psm; | |
1da177e4 LT |
5316 | |
5317 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5318 | cid = __le16_to_cpu(lh->cid); | |
5319 | len = __le16_to_cpu(lh->len); | |
5320 | ||
1c2acffb GP |
5321 | if (len != skb->len) { |
5322 | kfree_skb(skb); | |
5323 | return; | |
5324 | } | |
5325 | ||
1da177e4 LT |
5326 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5327 | ||
5328 | switch (cid) { | |
3300d9a9 | 5329 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5330 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5331 | l2cap_sig_channel(conn, skb); |
5332 | break; | |
5333 | ||
8db4dc46 | 5334 | case L2CAP_CID_CONN_LESS: |
097db76c | 5335 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5336 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5337 | l2cap_conless_channel(conn, psm, skb); |
5338 | break; | |
5339 | ||
9f69bda6 GP |
5340 | case L2CAP_CID_LE_DATA: |
5341 | l2cap_att_channel(conn, cid, skb); | |
5342 | break; | |
5343 | ||
b501d6a1 AB |
5344 | case L2CAP_CID_SMP: |
5345 | if (smp_sig_channel(conn, skb)) | |
5346 | l2cap_conn_del(conn->hcon, EACCES); | |
5347 | break; | |
5348 | ||
1da177e4 LT |
5349 | default: |
5350 | l2cap_data_channel(conn, cid, skb); | |
5351 | break; | |
5352 | } | |
5353 | } | |
5354 | ||
5355 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5356 | ||
686ebf28 | 5357 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5358 | { |
5359 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5360 | struct l2cap_chan *c; |
1da177e4 | 5361 | |
6ed93dc6 | 5362 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
5363 | |
5364 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5365 | read_lock(&chan_list_lock); |
5366 | list_for_each_entry(c, &chan_list, global_l) { | |
5367 | struct sock *sk = c->sk; | |
4343478f | 5368 | |
89bc500e | 5369 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5370 | continue; |
5371 | ||
5372 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5373 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5374 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5375 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5376 | exact++; |
2af6b9d5 MH |
5377 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5378 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5379 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5380 | lm2 |= HCI_LM_MASTER; |
5381 | } | |
1da177e4 | 5382 | } |
23691d75 | 5383 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5384 | |
5385 | return exact ? lm1 : lm2; | |
5386 | } | |
5387 | ||
9e664631 | 5388 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5389 | { |
0139418c MH |
5390 | struct l2cap_conn *conn; |
5391 | ||
6ed93dc6 | 5392 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 5393 | |
1da177e4 | 5394 | if (!status) { |
1da177e4 LT |
5395 | conn = l2cap_conn_add(hcon, status); |
5396 | if (conn) | |
5397 | l2cap_conn_ready(conn); | |
0139418c | 5398 | } else |
e175072f | 5399 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 | 5400 | |
1da177e4 LT |
5401 | } |
5402 | ||
686ebf28 | 5403 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5404 | { |
5405 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5406 | ||
5407 | BT_DBG("hcon %p", hcon); | |
5408 | ||
686ebf28 | 5409 | if (!conn) |
9f5a0d7b | 5410 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5411 | return conn->disc_reason; |
5412 | } | |
5413 | ||
9e664631 | 5414 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5415 | { |
5416 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5417 | ||
e175072f | 5418 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5419 | } |
5420 | ||
4343478f | 5421 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5422 | { |
715ec005 | 5423 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5424 | return; |
5425 | ||
f62e4323 | 5426 | if (encrypt == 0x00) { |
4343478f | 5427 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5428 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5429 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5430 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5431 | } else { |
4343478f | 5432 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5433 | __clear_chan_timer(chan); |
f62e4323 MH |
5434 | } |
5435 | } | |
5436 | ||
686ebf28 | 5437 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5438 | { |
0139418c | 5439 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5440 | struct l2cap_chan *chan; |
1da177e4 | 5441 | |
0139418c | 5442 | if (!conn) |
1da177e4 | 5443 | return 0; |
0139418c | 5444 | |
89d8b407 | 5445 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 5446 | |
160dc6ac | 5447 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5448 | if (!status && encrypt) |
5449 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5450 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5451 | } |
5452 | ||
3df91ea2 | 5453 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5454 | |
3df91ea2 | 5455 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5456 | l2cap_chan_lock(chan); |
1da177e4 | 5457 | |
89d8b407 AE |
5458 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
5459 | state_to_string(chan->state)); | |
f1cb9af5 | 5460 | |
78eb2f98 AE |
5461 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
5462 | l2cap_chan_unlock(chan); | |
5463 | continue; | |
5464 | } | |
5465 | ||
f1cb9af5 VCG |
5466 | if (chan->scid == L2CAP_CID_LE_DATA) { |
5467 | if (!status && encrypt) { | |
5468 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5469 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5470 | } |
5471 | ||
6be36555 | 5472 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5473 | continue; |
5474 | } | |
5475 | ||
c1360a1c | 5476 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5477 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5478 | continue; |
5479 | } | |
5480 | ||
89bc500e GP |
5481 | if (!status && (chan->state == BT_CONNECTED || |
5482 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5483 | struct sock *sk = chan->sk; |
5484 | ||
c5daa683 | 5485 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5486 | sk->sk_state_change(sk); |
5487 | ||
4343478f | 5488 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5489 | l2cap_chan_unlock(chan); |
9719f8af MH |
5490 | continue; |
5491 | } | |
5492 | ||
89bc500e | 5493 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5494 | if (!status) { |
93c3e8f5 | 5495 | l2cap_start_connection(chan); |
b1235d79 | 5496 | } else { |
ba13ccd9 | 5497 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5498 | } |
89bc500e | 5499 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5500 | struct sock *sk = chan->sk; |
b1235d79 | 5501 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5502 | __u16 res, stat; |
1da177e4 | 5503 | |
6be36555 AE |
5504 | lock_sock(sk); |
5505 | ||
b1235d79 | 5506 | if (!status) { |
c5daa683 GP |
5507 | if (test_bit(BT_SK_DEFER_SETUP, |
5508 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5509 | struct sock *parent = bt_sk(sk)->parent; |
5510 | res = L2CAP_CR_PEND; | |
5511 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5512 | if (parent) |
5513 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5514 | } else { |
0e587be7 | 5515 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5516 | res = L2CAP_CR_SUCCESS; |
5517 | stat = L2CAP_CS_NO_INFO; | |
5518 | } | |
b1235d79 | 5519 | } else { |
0e587be7 | 5520 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5521 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5522 | res = L2CAP_CR_SEC_BLOCK; |
5523 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5524 | } |
5525 | ||
6be36555 AE |
5526 | release_sock(sk); |
5527 | ||
fe4128e0 GP |
5528 | rsp.scid = cpu_to_le16(chan->dcid); |
5529 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5530 | rsp.result = cpu_to_le16(res); |
5531 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5532 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5533 | sizeof(rsp), &rsp); | |
2d369359 MM |
5534 | |
5535 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5536 | res == L2CAP_CR_SUCCESS) { | |
5537 | char buf[128]; | |
5538 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5539 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5540 | L2CAP_CONF_REQ, | |
5541 | l2cap_build_conf_req(chan, buf), | |
5542 | buf); | |
5543 | chan->num_conf_req++; | |
5544 | } | |
b1235d79 | 5545 | } |
1da177e4 | 5546 | |
6be36555 | 5547 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5548 | } |
5549 | ||
3df91ea2 | 5550 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5551 | |
1da177e4 LT |
5552 | return 0; |
5553 | } | |
5554 | ||
686ebf28 | 5555 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5556 | { |
5557 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5558 | ||
5a08ecce AE |
5559 | if (!conn) |
5560 | conn = l2cap_conn_add(hcon, 0); | |
5561 | ||
5562 | if (!conn) | |
1da177e4 LT |
5563 | goto drop; |
5564 | ||
5565 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5566 | ||
e702112f | 5567 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5568 | struct l2cap_hdr *hdr; |
5569 | int len; | |
5570 | ||
5571 | if (conn->rx_len) { | |
5572 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5573 | kfree_skb(conn->rx_skb); | |
5574 | conn->rx_skb = NULL; | |
5575 | conn->rx_len = 0; | |
5576 | l2cap_conn_unreliable(conn, ECOMM); | |
5577 | } | |
5578 | ||
aae7fe22 AE |
5579 | /* Start fragment always begin with Basic L2CAP header */ |
5580 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5581 | BT_ERR("Frame is too short (len %d)", skb->len); |
5582 | l2cap_conn_unreliable(conn, ECOMM); | |
5583 | goto drop; | |
5584 | } | |
5585 | ||
5586 | hdr = (struct l2cap_hdr *) skb->data; | |
5587 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5588 | ||
5589 | if (len == skb->len) { | |
5590 | /* Complete frame received */ | |
5591 | l2cap_recv_frame(conn, skb); | |
5592 | return 0; | |
5593 | } | |
5594 | ||
5595 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5596 | ||
5597 | if (skb->len > len) { | |
5598 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5599 | skb->len, len); | |
5600 | l2cap_conn_unreliable(conn, ECOMM); | |
5601 | goto drop; | |
5602 | } | |
5603 | ||
5604 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5605 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5606 | if (!conn->rx_skb) | |
1da177e4 LT |
5607 | goto drop; |
5608 | ||
d626f62b | 5609 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5610 | skb->len); |
1da177e4 LT |
5611 | conn->rx_len = len - skb->len; |
5612 | } else { | |
5613 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5614 | ||
5615 | if (!conn->rx_len) { | |
5616 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5617 | l2cap_conn_unreliable(conn, ECOMM); | |
5618 | goto drop; | |
5619 | } | |
5620 | ||
5621 | if (skb->len > conn->rx_len) { | |
5622 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5623 | skb->len, conn->rx_len); | |
5624 | kfree_skb(conn->rx_skb); | |
5625 | conn->rx_skb = NULL; | |
5626 | conn->rx_len = 0; | |
5627 | l2cap_conn_unreliable(conn, ECOMM); | |
5628 | goto drop; | |
5629 | } | |
5630 | ||
d626f62b | 5631 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5632 | skb->len); |
1da177e4 LT |
5633 | conn->rx_len -= skb->len; |
5634 | ||
5635 | if (!conn->rx_len) { | |
5636 | /* Complete frame received */ | |
5637 | l2cap_recv_frame(conn, conn->rx_skb); | |
5638 | conn->rx_skb = NULL; | |
5639 | } | |
5640 | } | |
5641 | ||
5642 | drop: | |
5643 | kfree_skb(skb); | |
5644 | return 0; | |
5645 | } | |
5646 | ||
aef7d97c | 5647 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5648 | { |
23691d75 | 5649 | struct l2cap_chan *c; |
1da177e4 | 5650 | |
333055f2 | 5651 | read_lock(&chan_list_lock); |
1da177e4 | 5652 | |
23691d75 GP |
5653 | list_for_each_entry(c, &chan_list, global_l) { |
5654 | struct sock *sk = c->sk; | |
101545f6 | 5655 | |
fcb73338 AE |
5656 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
5657 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
5658 | c->state, __le16_to_cpu(c->psm), | |
5659 | c->scid, c->dcid, c->imtu, c->omtu, | |
5660 | c->sec_level, c->mode); | |
61e1b4b7 | 5661 | } |
1da177e4 | 5662 | |
333055f2 | 5663 | read_unlock(&chan_list_lock); |
1da177e4 | 5664 | |
aef7d97c | 5665 | return 0; |
1da177e4 LT |
5666 | } |
5667 | ||
aef7d97c MH |
5668 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5669 | { | |
5670 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5671 | } | |
5672 | ||
5673 | static const struct file_operations l2cap_debugfs_fops = { | |
5674 | .open = l2cap_debugfs_open, | |
5675 | .read = seq_read, | |
5676 | .llseek = seq_lseek, | |
5677 | .release = single_release, | |
5678 | }; | |
5679 | ||
5680 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5681 | |
64274518 | 5682 | int __init l2cap_init(void) |
1da177e4 LT |
5683 | { |
5684 | int err; | |
be9d1227 | 5685 | |
bb58f747 | 5686 | err = l2cap_init_sockets(); |
1da177e4 LT |
5687 | if (err < 0) |
5688 | return err; | |
5689 | ||
aef7d97c MH |
5690 | if (bt_debugfs) { |
5691 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5692 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5693 | if (!l2cap_debugfs) | |
5694 | BT_ERR("Failed to create L2CAP debug file"); | |
5695 | } | |
1da177e4 | 5696 | |
1da177e4 | 5697 | return 0; |
1da177e4 LT |
5698 | } |
5699 | ||
64274518 | 5700 | void l2cap_exit(void) |
1da177e4 | 5701 | { |
aef7d97c | 5702 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5703 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5704 | } |
5705 | ||
d1c4a17d GP |
5706 | module_param(disable_ertm, bool, 0644); |
5707 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |