Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
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 | 50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 51 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 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, |
2d792818 | 59 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 60 | |
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
2d792818 GP |
63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
64 | u16 cid) | |
0139418c | 65 | { |
3df91ea2 | 66 | struct l2cap_chan *c; |
3d57dc68 | 67 | |
3df91ea2 AE |
68 | list_for_each_entry(c, &conn->chan_l, list) { |
69 | if (c->dcid == cid) | |
70 | return c; | |
0139418c | 71 | } |
3df91ea2 | 72 | return NULL; |
0139418c MH |
73 | } |
74 | ||
2d792818 GP |
75 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
76 | u16 cid) | |
0139418c | 77 | { |
3df91ea2 | 78 | struct l2cap_chan *c; |
3d57dc68 | 79 | |
3df91ea2 AE |
80 | list_for_each_entry(c, &conn->chan_l, list) { |
81 | if (c->scid == cid) | |
82 | return c; | |
0139418c | 83 | } |
3df91ea2 | 84 | return NULL; |
0139418c MH |
85 | } |
86 | ||
87 | /* Find channel with given SCID. | |
ef191ade | 88 | * Returns locked channel. */ |
2d792818 GP |
89 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
90 | u16 cid) | |
0139418c | 91 | { |
48454079 | 92 | struct l2cap_chan *c; |
baa7e1fa | 93 | |
3df91ea2 | 94 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 95 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
96 | if (c) |
97 | l2cap_chan_lock(c); | |
3df91ea2 AE |
98 | mutex_unlock(&conn->chan_lock); |
99 | ||
48454079 | 100 | return c; |
0139418c MH |
101 | } |
102 | ||
2d792818 GP |
103 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
104 | u8 ident) | |
0139418c | 105 | { |
3df91ea2 | 106 | struct l2cap_chan *c; |
3d57dc68 | 107 | |
3df91ea2 AE |
108 | list_for_each_entry(c, &conn->chan_l, list) { |
109 | if (c->ident == ident) | |
110 | return c; | |
0139418c | 111 | } |
3df91ea2 | 112 | return NULL; |
0139418c MH |
113 | } |
114 | ||
23691d75 | 115 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 116 | { |
23691d75 | 117 | struct l2cap_chan *c; |
9e4425ff | 118 | |
23691d75 GP |
119 | list_for_each_entry(c, &chan_list, global_l) { |
120 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 121 | return c; |
9e4425ff | 122 | } |
250938cb | 123 | return NULL; |
9e4425ff GP |
124 | } |
125 | ||
126 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
127 | { | |
73b2ec18 GP |
128 | int err; |
129 | ||
333055f2 | 130 | write_lock(&chan_list_lock); |
9e4425ff | 131 | |
23691d75 | 132 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
133 | err = -EADDRINUSE; |
134 | goto done; | |
9e4425ff GP |
135 | } |
136 | ||
73b2ec18 GP |
137 | if (psm) { |
138 | chan->psm = psm; | |
139 | chan->sport = psm; | |
140 | err = 0; | |
141 | } else { | |
142 | u16 p; | |
143 | ||
144 | err = -EINVAL; | |
145 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 146 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
147 | chan->psm = cpu_to_le16(p); |
148 | chan->sport = cpu_to_le16(p); | |
149 | err = 0; | |
150 | break; | |
151 | } | |
152 | } | |
9e4425ff | 153 | |
73b2ec18 | 154 | done: |
333055f2 | 155 | write_unlock(&chan_list_lock); |
73b2ec18 | 156 | return err; |
9e4425ff GP |
157 | } |
158 | ||
159 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
160 | { | |
333055f2 | 161 | write_lock(&chan_list_lock); |
9e4425ff GP |
162 | |
163 | chan->scid = scid; | |
164 | ||
333055f2 | 165 | write_unlock(&chan_list_lock); |
9e4425ff GP |
166 | |
167 | return 0; | |
168 | } | |
169 | ||
baa7e1fa | 170 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 171 | { |
8db4dc46 | 172 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 173 | |
8db4dc46 | 174 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 175 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
176 | return cid; |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
0e587be7 | 182 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 183 | { |
42d2d87c | 184 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 185 | state_to_string(state)); |
badaaa00 | 186 | |
89bc500e | 187 | chan->state = state; |
80b98027 | 188 | chan->ops->state_change(chan, state); |
89bc500e GP |
189 | } |
190 | ||
0e587be7 AE |
191 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
192 | { | |
193 | struct sock *sk = chan->sk; | |
194 | ||
195 | lock_sock(sk); | |
196 | __l2cap_state_change(chan, state); | |
197 | release_sock(sk); | |
198 | } | |
199 | ||
2e0052e4 AE |
200 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
201 | { | |
202 | struct sock *sk = chan->sk; | |
203 | ||
204 | sk->sk_err = err; | |
205 | } | |
206 | ||
207 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
208 | { | |
209 | struct sock *sk = chan->sk; | |
210 | ||
211 | lock_sock(sk); | |
212 | __l2cap_chan_set_err(chan, err); | |
213 | release_sock(sk); | |
214 | } | |
215 | ||
4239d16f MM |
216 | static void __set_retrans_timer(struct l2cap_chan *chan) |
217 | { | |
218 | if (!delayed_work_pending(&chan->monitor_timer) && | |
219 | chan->retrans_timeout) { | |
220 | l2cap_set_timer(chan, &chan->retrans_timer, | |
221 | msecs_to_jiffies(chan->retrans_timeout)); | |
222 | } | |
223 | } | |
224 | ||
225 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
226 | { | |
227 | __clear_retrans_timer(chan); | |
228 | if (chan->monitor_timeout) { | |
229 | l2cap_set_timer(chan, &chan->monitor_timer, | |
230 | msecs_to_jiffies(chan->monitor_timeout)); | |
231 | } | |
232 | } | |
233 | ||
608bcc6d MM |
234 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
235 | u16 seq) | |
236 | { | |
237 | struct sk_buff *skb; | |
238 | ||
239 | skb_queue_walk(head, skb) { | |
240 | if (bt_cb(skb)->control.txseq == seq) | |
241 | return skb; | |
242 | } | |
243 | ||
244 | return NULL; | |
245 | } | |
246 | ||
3c588192 MM |
247 | /* ---- L2CAP sequence number lists ---- */ |
248 | ||
249 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
250 | * SREJ requests that are received and for frames that are to be | |
251 | * retransmitted. These seq_list functions implement a singly-linked | |
252 | * list in an array, where membership in the list can also be checked | |
253 | * in constant time. Items can also be added to the tail of the list | |
254 | * and removed from the head in constant time, without further memory | |
255 | * allocs or frees. | |
256 | */ | |
257 | ||
258 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
259 | { | |
260 | size_t alloc_size, i; | |
261 | ||
262 | /* Allocated size is a power of 2 to map sequence numbers | |
263 | * (which may be up to 14 bits) in to a smaller array that is | |
264 | * sized for the negotiated ERTM transmit windows. | |
265 | */ | |
266 | alloc_size = roundup_pow_of_two(size); | |
267 | ||
268 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
269 | if (!seq_list->list) | |
270 | return -ENOMEM; | |
271 | ||
272 | seq_list->mask = alloc_size - 1; | |
273 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
274 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
275 | for (i = 0; i < alloc_size; i++) | |
276 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
282 | { | |
283 | kfree(seq_list->list); | |
284 | } | |
285 | ||
286 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
287 | u16 seq) | |
288 | { | |
289 | /* Constant-time check for list membership */ | |
290 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
291 | } | |
292 | ||
293 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
294 | { | |
295 | u16 mask = seq_list->mask; | |
296 | ||
297 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
298 | /* In case someone tries to pop the head of an empty list */ | |
299 | return L2CAP_SEQ_LIST_CLEAR; | |
300 | } else if (seq_list->head == seq) { | |
301 | /* Head can be removed in constant time */ | |
302 | seq_list->head = seq_list->list[seq & mask]; | |
303 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
304 | ||
305 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
306 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
307 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
308 | } | |
309 | } else { | |
310 | /* Walk the list to find the sequence number */ | |
311 | u16 prev = seq_list->head; | |
312 | while (seq_list->list[prev & mask] != seq) { | |
313 | prev = seq_list->list[prev & mask]; | |
314 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
315 | return L2CAP_SEQ_LIST_CLEAR; | |
316 | } | |
317 | ||
318 | /* Unlink the number from the list and clear it */ | |
319 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
320 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
321 | if (seq_list->tail == seq) | |
322 | seq_list->tail = prev; | |
323 | } | |
324 | return seq; | |
325 | } | |
326 | ||
327 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
328 | { | |
329 | /* Remove the head in constant time */ | |
330 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
331 | } | |
332 | ||
333 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
334 | { | |
f522ae36 | 335 | u16 i; |
3c588192 | 336 | |
f522ae36 GP |
337 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
338 | return; | |
339 | ||
340 | for (i = 0; i <= seq_list->mask; i++) | |
341 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
342 | ||
343 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
344 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
345 | } |
346 | ||
347 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
348 | { | |
349 | u16 mask = seq_list->mask; | |
350 | ||
351 | /* All appends happen in constant time */ | |
352 | ||
f522ae36 GP |
353 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
354 | return; | |
3c588192 | 355 | |
f522ae36 GP |
356 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
357 | seq_list->head = seq; | |
358 | else | |
359 | seq_list->list[seq_list->tail & mask] = seq; | |
360 | ||
361 | seq_list->tail = seq; | |
362 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
363 | } |
364 | ||
721c4181 | 365 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 366 | { |
721c4181 | 367 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 368 | chan_timer.work); |
3df91ea2 | 369 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
370 | int reason; |
371 | ||
e05dcc32 | 372 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 373 | |
3df91ea2 | 374 | mutex_lock(&conn->chan_lock); |
6be36555 | 375 | l2cap_chan_lock(chan); |
ab07801d | 376 | |
89bc500e | 377 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 378 | reason = ECONNREFUSED; |
89bc500e | 379 | else if (chan->state == BT_CONNECT && |
2d792818 | 380 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
381 | reason = ECONNREFUSED; |
382 | else | |
383 | reason = ETIMEDOUT; | |
384 | ||
0f852724 | 385 | l2cap_chan_close(chan, reason); |
ab07801d | 386 | |
6be36555 | 387 | l2cap_chan_unlock(chan); |
ab07801d | 388 | |
80b98027 | 389 | chan->ops->close(chan); |
3df91ea2 AE |
390 | mutex_unlock(&conn->chan_lock); |
391 | ||
371fd835 | 392 | l2cap_chan_put(chan); |
ab07801d GP |
393 | } |
394 | ||
eef1d9b6 | 395 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
396 | { |
397 | struct l2cap_chan *chan; | |
398 | ||
399 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
400 | if (!chan) | |
401 | return NULL; | |
402 | ||
c03b355e AE |
403 | mutex_init(&chan->lock); |
404 | ||
333055f2 | 405 | write_lock(&chan_list_lock); |
23691d75 | 406 | list_add(&chan->global_l, &chan_list); |
333055f2 | 407 | write_unlock(&chan_list_lock); |
23691d75 | 408 | |
721c4181 | 409 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 410 | |
89bc500e GP |
411 | chan->state = BT_OPEN; |
412 | ||
144ad330 | 413 | kref_init(&chan->kref); |
71ba0e56 | 414 | |
2827011f MM |
415 | /* This flag is cleared in l2cap_chan_ready() */ |
416 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
417 | ||
eef1d9b6 | 418 | BT_DBG("chan %p", chan); |
abc545b8 | 419 | |
48454079 GP |
420 | return chan; |
421 | } | |
422 | ||
144ad330 | 423 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 424 | { |
144ad330 SS |
425 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
426 | ||
4af66c69 JK |
427 | BT_DBG("chan %p", chan); |
428 | ||
333055f2 | 429 | write_lock(&chan_list_lock); |
23691d75 | 430 | list_del(&chan->global_l); |
333055f2 | 431 | write_unlock(&chan_list_lock); |
23691d75 | 432 | |
4af66c69 | 433 | kfree(chan); |
6ff5abbf GP |
434 | } |
435 | ||
30648372 JK |
436 | void l2cap_chan_hold(struct l2cap_chan *c) |
437 | { | |
144ad330 | 438 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 439 | |
144ad330 | 440 | kref_get(&c->kref); |
30648372 JK |
441 | } |
442 | ||
443 | void l2cap_chan_put(struct l2cap_chan *c) | |
444 | { | |
144ad330 | 445 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 446 | |
144ad330 | 447 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
448 | } |
449 | ||
bd4b1653 AE |
450 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
451 | { | |
452 | chan->fcs = L2CAP_FCS_CRC16; | |
453 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
454 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
455 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 456 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
457 | chan->sec_level = BT_SECURITY_LOW; |
458 | ||
459 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
460 | } | |
461 | ||
93c3e8f5 | 462 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 463 | { |
af05b30b | 464 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 465 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 466 | |
9f5a0d7b | 467 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 468 | |
8c1d787b | 469 | chan->conn = conn; |
0139418c | 470 | |
5491120e AE |
471 | switch (chan->chan_type) { |
472 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
473 | if (conn->hcon->type == LE_LINK) { |
474 | /* LE connection */ | |
6fcb06a2 | 475 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
476 | chan->scid = L2CAP_CID_LE_DATA; |
477 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
478 | } else { |
479 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 480 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 481 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 482 | } |
5491120e AE |
483 | break; |
484 | ||
485 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 486 | /* Connectionless socket */ |
fe4128e0 GP |
487 | chan->scid = L2CAP_CID_CONN_LESS; |
488 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 489 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
490 | break; |
491 | ||
416fa752 AE |
492 | case L2CAP_CHAN_CONN_FIX_A2MP: |
493 | chan->scid = L2CAP_CID_A2MP; | |
494 | chan->dcid = L2CAP_CID_A2MP; | |
495 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
496 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
497 | break; | |
498 | ||
5491120e | 499 | default: |
0139418c | 500 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
501 | chan->scid = L2CAP_CID_SIGNALING; |
502 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 503 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
504 | } |
505 | ||
8f7975b1 AE |
506 | chan->local_id = L2CAP_BESTEFFORT_ID; |
507 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
508 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
509 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
510 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 511 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 512 | |
371fd835 | 513 | l2cap_chan_hold(chan); |
baa7e1fa | 514 | |
3df91ea2 | 515 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
516 | } |
517 | ||
466f8004 | 518 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
519 | { |
520 | mutex_lock(&conn->chan_lock); | |
521 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 522 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
523 | } |
524 | ||
466f8004 | 525 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 526 | { |
8c1d787b | 527 | struct l2cap_conn *conn = chan->conn; |
0139418c | 528 | |
c9b66675 | 529 | __clear_chan_timer(chan); |
0139418c | 530 | |
49208c9c | 531 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 532 | |
8e87d142 | 533 | if (conn) { |
baa7e1fa | 534 | /* Delete from channel list */ |
3df91ea2 | 535 | list_del(&chan->list); |
3d57dc68 | 536 | |
371fd835 | 537 | l2cap_chan_put(chan); |
baa7e1fa | 538 | |
8c1d787b | 539 | chan->conn = NULL; |
3cabbfda AE |
540 | |
541 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
542 | hci_conn_put(conn->hcon); | |
0139418c MH |
543 | } |
544 | ||
c0df7f6e AE |
545 | if (chan->ops->teardown) |
546 | chan->ops->teardown(chan, err); | |
6be36555 | 547 | |
2827011f | 548 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 549 | return; |
2ead70b8 | 550 | |
ee556f66 GP |
551 | switch(chan->mode) { |
552 | case L2CAP_MODE_BASIC: | |
553 | break; | |
c13ffa62 | 554 | |
ee556f66 | 555 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
556 | __clear_retrans_timer(chan); |
557 | __clear_monitor_timer(chan); | |
558 | __clear_ack_timer(chan); | |
c13ffa62 | 559 | |
f1c6775b | 560 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 561 | |
3c588192 MM |
562 | l2cap_seq_list_free(&chan->srej_list); |
563 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
564 | |
565 | /* fall through */ | |
566 | ||
567 | case L2CAP_MODE_STREAMING: | |
568 | skb_queue_purge(&chan->tx_q); | |
569 | break; | |
c13ffa62 | 570 | } |
ee556f66 GP |
571 | |
572 | return; | |
0139418c MH |
573 | } |
574 | ||
0f852724 | 575 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
576 | { |
577 | struct l2cap_conn *conn = chan->conn; | |
578 | struct sock *sk = chan->sk; | |
579 | ||
2d792818 GP |
580 | BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
581 | sk); | |
4519de9a | 582 | |
89bc500e | 583 | switch (chan->state) { |
4519de9a | 584 | case BT_LISTEN: |
c0df7f6e AE |
585 | if (chan->ops->teardown) |
586 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
587 | break; |
588 | ||
589 | case BT_CONNECTED: | |
590 | case BT_CONFIG: | |
715ec005 | 591 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 592 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 593 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
594 | l2cap_send_disconn_req(conn, chan, reason); |
595 | } else | |
596 | l2cap_chan_del(chan, reason); | |
597 | break; | |
598 | ||
599 | case BT_CONNECT2: | |
715ec005 | 600 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 601 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
602 | struct l2cap_conn_rsp rsp; |
603 | __u16 result; | |
604 | ||
c5daa683 | 605 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
606 | result = L2CAP_CR_SEC_BLOCK; |
607 | else | |
608 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 609 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
610 | |
611 | rsp.scid = cpu_to_le16(chan->dcid); | |
612 | rsp.dcid = cpu_to_le16(chan->scid); | |
613 | rsp.result = cpu_to_le16(result); | |
ac73498c | 614 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 615 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 616 | sizeof(rsp), &rsp); |
4519de9a GP |
617 | } |
618 | ||
619 | l2cap_chan_del(chan, reason); | |
620 | break; | |
621 | ||
622 | case BT_CONNECT: | |
623 | case BT_DISCONN: | |
624 | l2cap_chan_del(chan, reason); | |
625 | break; | |
626 | ||
627 | default: | |
c0df7f6e AE |
628 | if (chan->ops->teardown) |
629 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
630 | break; |
631 | } | |
632 | } | |
633 | ||
4343478f | 634 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 635 | { |
715ec005 | 636 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 637 | switch (chan->sec_level) { |
8556edd3 JH |
638 | case BT_SECURITY_HIGH: |
639 | return HCI_AT_DEDICATED_BONDING_MITM; | |
640 | case BT_SECURITY_MEDIUM: | |
641 | return HCI_AT_DEDICATED_BONDING; | |
642 | default: | |
643 | return HCI_AT_NO_BONDING; | |
644 | } | |
2983fd68 | 645 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
646 | if (chan->sec_level == BT_SECURITY_LOW) |
647 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 648 | |
4343478f | 649 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 650 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 651 | else |
8556edd3 | 652 | return HCI_AT_NO_BONDING; |
00ae4af9 | 653 | } else { |
4343478f | 654 | switch (chan->sec_level) { |
00ae4af9 | 655 | case BT_SECURITY_HIGH: |
8556edd3 | 656 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 657 | case BT_SECURITY_MEDIUM: |
8556edd3 | 658 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 659 | default: |
8556edd3 | 660 | return HCI_AT_NO_BONDING; |
00ae4af9 | 661 | } |
0684e5f9 | 662 | } |
8556edd3 JH |
663 | } |
664 | ||
665 | /* Service level security */ | |
d45fc423 | 666 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 667 | { |
8c1d787b | 668 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
669 | __u8 auth_type; |
670 | ||
4343478f | 671 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 672 | |
4343478f | 673 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
674 | } |
675 | ||
b5ad8b7f | 676 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
677 | { |
678 | u8 id; | |
679 | ||
680 | /* Get next available identificator. | |
681 | * 1 - 128 are used by kernel. | |
682 | * 129 - 199 are reserved. | |
683 | * 200 - 254 are used by utilities like l2ping, etc. | |
684 | */ | |
685 | ||
333055f2 | 686 | spin_lock(&conn->lock); |
4e8402a3 MH |
687 | |
688 | if (++conn->tx_ident > 128) | |
689 | conn->tx_ident = 1; | |
690 | ||
691 | id = conn->tx_ident; | |
692 | ||
333055f2 | 693 | spin_unlock(&conn->lock); |
4e8402a3 MH |
694 | |
695 | return id; | |
696 | } | |
697 | ||
2d792818 GP |
698 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
699 | void *data) | |
4e8402a3 MH |
700 | { |
701 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 702 | u8 flags; |
4e8402a3 MH |
703 | |
704 | BT_DBG("code 0x%2.2x", code); | |
705 | ||
706 | if (!skb) | |
9a9c6a34 | 707 | return; |
4e8402a3 | 708 | |
e702112f AE |
709 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
710 | flags = ACL_START_NO_FLUSH; | |
711 | else | |
712 | flags = ACL_START; | |
713 | ||
14b12d0b | 714 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 715 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 716 | |
73d80deb LAD |
717 | hci_send_acl(conn->hchan, skb, flags); |
718 | } | |
719 | ||
720 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
721 | { | |
722 | struct hci_conn *hcon = chan->conn->hcon; | |
723 | u16 flags; | |
724 | ||
725 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 726 | skb->priority); |
73d80deb LAD |
727 | |
728 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
2d792818 | 729 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
730 | flags = ACL_START_NO_FLUSH; |
731 | else | |
732 | flags = ACL_START; | |
14b12d0b | 733 | |
73d80deb LAD |
734 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
735 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
736 | } |
737 | ||
b76bbd66 MM |
738 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
739 | { | |
740 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
741 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
742 | ||
743 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
744 | /* S-Frame */ | |
745 | control->sframe = 1; | |
746 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
747 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
748 | ||
749 | control->sar = 0; | |
750 | control->txseq = 0; | |
751 | } else { | |
752 | /* I-Frame */ | |
753 | control->sframe = 0; | |
754 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
755 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
756 | ||
757 | control->poll = 0; | |
758 | control->super = 0; | |
759 | } | |
760 | } | |
761 | ||
b76bbd66 MM |
762 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
763 | { | |
764 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
765 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
766 | ||
767 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
768 | /* S-Frame */ | |
769 | control->sframe = 1; | |
770 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
771 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
772 | ||
773 | control->sar = 0; | |
774 | control->txseq = 0; | |
775 | } else { | |
776 | /* I-Frame */ | |
777 | control->sframe = 0; | |
778 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
779 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
780 | ||
781 | control->poll = 0; | |
782 | control->super = 0; | |
783 | } | |
784 | } | |
785 | ||
786 | static inline void __unpack_control(struct l2cap_chan *chan, | |
787 | struct sk_buff *skb) | |
788 | { | |
789 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
790 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
791 | &bt_cb(skb)->control); | |
cec8ab6e | 792 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
793 | } else { |
794 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
795 | &bt_cb(skb)->control); | |
cec8ab6e | 796 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
797 | } |
798 | } | |
799 | ||
b5c6aaed MM |
800 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
801 | { | |
802 | u32 packed; | |
803 | ||
804 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
805 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
806 | ||
807 | if (control->sframe) { | |
808 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
809 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
810 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
811 | } else { | |
812 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
813 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
814 | } | |
815 | ||
816 | return packed; | |
817 | } | |
818 | ||
819 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
820 | { | |
821 | u16 packed; | |
822 | ||
823 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
824 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
825 | ||
826 | if (control->sframe) { | |
827 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
828 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
829 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
830 | } else { | |
831 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
832 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
833 | } | |
834 | ||
835 | return packed; | |
836 | } | |
837 | ||
b76bbd66 MM |
838 | static inline void __pack_control(struct l2cap_chan *chan, |
839 | struct l2cap_ctrl *control, | |
840 | struct sk_buff *skb) | |
841 | { | |
842 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
843 | put_unaligned_le32(__pack_extended_control(control), | |
844 | skb->data + L2CAP_HDR_SIZE); | |
845 | } else { | |
846 | put_unaligned_le16(__pack_enhanced_control(control), | |
847 | skb->data + L2CAP_HDR_SIZE); | |
848 | } | |
849 | } | |
850 | ||
ba7aa64f GP |
851 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
852 | { | |
853 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
854 | return L2CAP_EXT_HDR_SIZE; | |
855 | else | |
856 | return L2CAP_ENH_HDR_SIZE; | |
857 | } | |
858 | ||
a67d7f6f MM |
859 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
860 | u32 control) | |
b5c6aaed MM |
861 | { |
862 | struct sk_buff *skb; | |
863 | struct l2cap_hdr *lh; | |
ba7aa64f | 864 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
865 | |
866 | if (chan->fcs == L2CAP_FCS_CRC16) | |
867 | hlen += L2CAP_FCS_SIZE; | |
868 | ||
a67d7f6f | 869 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 870 | |
b5c6aaed | 871 | if (!skb) |
a67d7f6f | 872 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
873 | |
874 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
875 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
876 | lh->cid = cpu_to_le16(chan->dcid); | |
877 | ||
a67d7f6f MM |
878 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
879 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
880 | else | |
881 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
882 | |
883 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 884 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
885 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
886 | } | |
887 | ||
888 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
889 | return skb; |
890 | } | |
891 | ||
892 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
893 | struct l2cap_ctrl *control) | |
894 | { | |
895 | struct sk_buff *skb; | |
896 | u32 control_field; | |
897 | ||
898 | BT_DBG("chan %p, control %p", chan, control); | |
899 | ||
900 | if (!control->sframe) | |
901 | return; | |
902 | ||
903 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
904 | !control->poll) | |
905 | control->final = 1; | |
906 | ||
907 | if (control->super == L2CAP_SUPER_RR) | |
908 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
909 | else if (control->super == L2CAP_SUPER_RNR) | |
910 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
911 | ||
912 | if (control->super != L2CAP_SUPER_SREJ) { | |
913 | chan->last_acked_seq = control->reqseq; | |
914 | __clear_ack_timer(chan); | |
915 | } | |
916 | ||
917 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
918 | control->final, control->poll, control->super); | |
919 | ||
920 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
921 | control_field = __pack_extended_control(control); | |
922 | else | |
923 | control_field = __pack_enhanced_control(control); | |
924 | ||
925 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
926 | if (!IS_ERR(skb)) | |
927 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
928 | } |
929 | ||
c9e3d5e0 | 930 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 931 | { |
c9e3d5e0 MM |
932 | struct l2cap_ctrl control; |
933 | ||
934 | BT_DBG("chan %p, poll %d", chan, poll); | |
935 | ||
936 | memset(&control, 0, sizeof(control)); | |
937 | control.sframe = 1; | |
938 | control.poll = poll; | |
939 | ||
940 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
941 | control.super = L2CAP_SUPER_RNR; | |
942 | else | |
943 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 944 | |
c9e3d5e0 MM |
945 | control.reqseq = chan->buffer_seq; |
946 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
947 | } |
948 | ||
b4450035 | 949 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 950 | { |
c1360a1c | 951 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
952 | } |
953 | ||
93c3e8f5 AE |
954 | static bool __amp_capable(struct l2cap_chan *chan) |
955 | { | |
956 | struct l2cap_conn *conn = chan->conn; | |
957 | ||
958 | if (enable_hs && | |
959 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && | |
960 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
961 | return true; | |
962 | else | |
963 | return false; | |
964 | } | |
965 | ||
2766be48 | 966 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
967 | { |
968 | struct l2cap_conn *conn = chan->conn; | |
969 | struct l2cap_conn_req req; | |
970 | ||
971 | req.scid = cpu_to_le16(chan->scid); | |
972 | req.psm = chan->psm; | |
973 | ||
974 | chan->ident = l2cap_get_ident(conn); | |
975 | ||
976 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
977 | ||
978 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
979 | } | |
980 | ||
9f0caeb1 VCG |
981 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
982 | { | |
2827011f | 983 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
984 | chan->conf_state = 0; |
985 | __clear_chan_timer(chan); | |
986 | ||
54a59aa2 | 987 | chan->state = BT_CONNECTED; |
9f0caeb1 | 988 | |
fd83e2c2 | 989 | chan->ops->ready(chan); |
9f0caeb1 VCG |
990 | } |
991 | ||
93c3e8f5 AE |
992 | static void l2cap_start_connection(struct l2cap_chan *chan) |
993 | { | |
994 | if (__amp_capable(chan)) { | |
995 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
996 | a2mp_discover_amp(chan); | |
997 | } else { | |
998 | l2cap_send_conn_req(chan); | |
999 | } | |
1000 | } | |
1001 | ||
fc7f8a7e | 1002 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1003 | { |
8c1d787b | 1004 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1005 | |
9f0caeb1 VCG |
1006 | if (conn->hcon->type == LE_LINK) { |
1007 | l2cap_chan_ready(chan); | |
1008 | return; | |
1009 | } | |
1010 | ||
79d554a6 | 1011 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1012 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1013 | return; | |
1014 | ||
d45fc423 | 1015 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1016 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1017 | l2cap_start_connection(chan); |
1018 | } | |
79d554a6 MH |
1019 | } else { |
1020 | struct l2cap_info_req req; | |
ac73498c | 1021 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1022 | |
1023 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1024 | conn->info_ident = l2cap_get_ident(conn); | |
1025 | ||
ba13ccd9 | 1026 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1027 | |
2d792818 GP |
1028 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1029 | sizeof(req), &req); | |
79d554a6 MH |
1030 | } |
1031 | } | |
1032 | ||
cf6c2c0b GP |
1033 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1034 | { | |
1035 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1036 | if (!disable_ertm) |
cf6c2c0b GP |
1037 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1038 | ||
1039 | switch (mode) { | |
1040 | case L2CAP_MODE_ERTM: | |
1041 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1042 | case L2CAP_MODE_STREAMING: | |
1043 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1044 | default: | |
1045 | return 0x00; | |
1046 | } | |
1047 | } | |
1048 | ||
2d792818 GP |
1049 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
1050 | struct l2cap_chan *chan, int err) | |
22121fc9 | 1051 | { |
6be36555 | 1052 | struct sock *sk = chan->sk; |
22121fc9 GP |
1053 | struct l2cap_disconn_req req; |
1054 | ||
c13ffa62 GP |
1055 | if (!conn) |
1056 | return; | |
1057 | ||
0c1bc5c6 | 1058 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1059 | __clear_retrans_timer(chan); |
1060 | __clear_monitor_timer(chan); | |
1061 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1062 | } |
1063 | ||
416fa752 | 1064 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1065 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1066 | return; |
1067 | } | |
1068 | ||
fe4128e0 GP |
1069 | req.dcid = cpu_to_le16(chan->dcid); |
1070 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1071 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1072 | sizeof(req), &req); | |
c13ffa62 | 1073 | |
6be36555 | 1074 | lock_sock(sk); |
0e587be7 | 1075 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1076 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1077 | release_sock(sk); |
22121fc9 GP |
1078 | } |
1079 | ||
1da177e4 | 1080 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1081 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1082 | { | |
3df91ea2 | 1083 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1084 | |
1085 | BT_DBG("conn %p", conn); | |
1086 | ||
3df91ea2 | 1087 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1088 | |
3df91ea2 | 1089 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1090 | struct sock *sk = chan->sk; |
baa7e1fa | 1091 | |
6be36555 | 1092 | l2cap_chan_lock(chan); |
4e8402a3 | 1093 | |
715ec005 | 1094 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1095 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1096 | continue; |
1097 | } | |
1098 | ||
89bc500e | 1099 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1100 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1101 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1102 | l2cap_chan_unlock(chan); |
47731de7 GP |
1103 | continue; |
1104 | } | |
79d554a6 | 1105 | |
c1360a1c | 1106 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1107 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1108 | &chan->conf_state)) { |
89bc500e | 1109 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1110 | l2cap_chan_unlock(chan); |
47731de7 | 1111 | continue; |
b1235d79 | 1112 | } |
47731de7 | 1113 | |
93c3e8f5 | 1114 | l2cap_start_connection(chan); |
47731de7 | 1115 | |
89bc500e | 1116 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1117 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1118 | char buf[128]; |
fe4128e0 GP |
1119 | rsp.scid = cpu_to_le16(chan->dcid); |
1120 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1121 | |
d45fc423 | 1122 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1123 | lock_sock(sk); |
c5daa683 GP |
1124 | if (test_bit(BT_SK_DEFER_SETUP, |
1125 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1126 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1127 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1128 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1129 | if (parent) |
1130 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1131 | |
1132 | } else { | |
0e587be7 | 1133 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1134 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1135 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1136 | } |
6be36555 | 1137 | release_sock(sk); |
79d554a6 | 1138 | } else { |
ac73498c AE |
1139 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1140 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1141 | } |
1142 | ||
fc7f8a7e | 1143 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1144 | sizeof(rsp), &rsp); |
e9aeb2dd | 1145 | |
c1360a1c | 1146 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1147 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1148 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1149 | continue; |
1150 | } | |
1151 | ||
c1360a1c | 1152 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1153 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1154 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1155 | chan->num_conf_req++; |
4e8402a3 MH |
1156 | } |
1157 | ||
6be36555 | 1158 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1159 | } |
1160 | ||
3df91ea2 | 1161 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1162 | } |
1163 | ||
c2287681 | 1164 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1165 | * Returns closest match, locked. |
1166 | */ | |
d9b88702 | 1167 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1168 | bdaddr_t *src, |
1169 | bdaddr_t *dst) | |
b62f328b | 1170 | { |
23691d75 | 1171 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1172 | |
23691d75 | 1173 | read_lock(&chan_list_lock); |
b62f328b | 1174 | |
23691d75 GP |
1175 | list_for_each_entry(c, &chan_list, global_l) { |
1176 | struct sock *sk = c->sk; | |
fe4128e0 | 1177 | |
89bc500e | 1178 | if (state && c->state != state) |
b62f328b VT |
1179 | continue; |
1180 | ||
23691d75 | 1181 | if (c->scid == cid) { |
c2287681 IY |
1182 | int src_match, dst_match; |
1183 | int src_any, dst_any; | |
1184 | ||
b62f328b | 1185 | /* Exact match. */ |
c2287681 IY |
1186 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1187 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1188 | if (src_match && dst_match) { | |
23691d75 GP |
1189 | read_unlock(&chan_list_lock); |
1190 | return c; | |
1191 | } | |
b62f328b VT |
1192 | |
1193 | /* Closest match */ | |
c2287681 IY |
1194 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1195 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1196 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1197 | (src_any && dst_any)) | |
23691d75 | 1198 | c1 = c; |
b62f328b VT |
1199 | } |
1200 | } | |
280f294f | 1201 | |
23691d75 | 1202 | read_unlock(&chan_list_lock); |
b62f328b | 1203 | |
23691d75 | 1204 | return c1; |
b62f328b VT |
1205 | } |
1206 | ||
1207 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1208 | { | |
c916fbe4 | 1209 | struct sock *parent, *sk; |
23691d75 | 1210 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1211 | |
1212 | BT_DBG(""); | |
1213 | ||
1214 | /* Check if we have socket listening on cid */ | |
23691d75 | 1215 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1216 | conn->src, conn->dst); |
23691d75 | 1217 | if (!pchan) |
b62f328b VT |
1218 | return; |
1219 | ||
23691d75 GP |
1220 | parent = pchan->sk; |
1221 | ||
aa2ac881 | 1222 | lock_sock(parent); |
62f3a2cf | 1223 | |
80b98027 | 1224 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1225 | if (!chan) |
b62f328b VT |
1226 | goto clean; |
1227 | ||
80808e43 | 1228 | sk = chan->sk; |
5d41ce1d | 1229 | |
b62f328b | 1230 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1231 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1232 | |
b62f328b VT |
1233 | bacpy(&bt_sk(sk)->src, conn->src); |
1234 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1235 | ||
d1010240 GP |
1236 | bt_accept_enqueue(parent, sk); |
1237 | ||
3d57dc68 | 1238 | l2cap_chan_add(conn, chan); |
48454079 | 1239 | |
6754e0df | 1240 | l2cap_chan_ready(chan); |
b62f328b | 1241 | |
b62f328b | 1242 | clean: |
aa2ac881 | 1243 | release_sock(parent); |
b62f328b VT |
1244 | } |
1245 | ||
4e8402a3 MH |
1246 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1247 | { | |
48454079 | 1248 | struct l2cap_chan *chan; |
cc110922 | 1249 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1250 | |
79d554a6 | 1251 | BT_DBG("conn %p", conn); |
4e8402a3 | 1252 | |
cc110922 | 1253 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1254 | l2cap_le_conn_ready(conn); |
1255 | ||
cc110922 VCG |
1256 | if (hcon->out && hcon->type == LE_LINK) |
1257 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1258 | |
3df91ea2 | 1259 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1260 | |
3df91ea2 | 1261 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1262 | |
6be36555 | 1263 | l2cap_chan_lock(chan); |
4e8402a3 | 1264 | |
416fa752 AE |
1265 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1266 | l2cap_chan_unlock(chan); | |
1267 | continue; | |
1268 | } | |
1269 | ||
cc110922 VCG |
1270 | if (hcon->type == LE_LINK) { |
1271 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1272 | l2cap_chan_ready(chan); |
acd7d370 | 1273 | |
63128451 | 1274 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1275 | struct sock *sk = chan->sk; |
c9b66675 | 1276 | __clear_chan_timer(chan); |
6be36555 | 1277 | lock_sock(sk); |
0e587be7 | 1278 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1279 | sk->sk_state_change(sk); |
6be36555 | 1280 | release_sock(sk); |
b501d6a1 | 1281 | |
89bc500e | 1282 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1283 | l2cap_do_start(chan); |
4e8402a3 | 1284 | |
6be36555 | 1285 | l2cap_chan_unlock(chan); |
4e8402a3 | 1286 | } |
79d554a6 | 1287 | |
3df91ea2 | 1288 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1289 | } |
1290 | ||
1291 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1292 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1293 | { | |
48454079 | 1294 | struct l2cap_chan *chan; |
4e8402a3 MH |
1295 | |
1296 | BT_DBG("conn %p", conn); | |
1297 | ||
3df91ea2 | 1298 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1299 | |
3df91ea2 | 1300 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1301 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1302 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1303 | } |
1304 | ||
3df91ea2 | 1305 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1306 | } |
1307 | ||
f878fcad | 1308 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1309 | { |
f878fcad | 1310 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1311 | info_timer.work); |
4e8402a3 | 1312 | |
984947dc | 1313 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1314 | conn->info_ident = 0; |
984947dc | 1315 | |
4e8402a3 MH |
1316 | l2cap_conn_start(conn); |
1317 | } | |
1318 | ||
5d3de7df VCG |
1319 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1320 | { | |
1321 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1322 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1323 | |
1324 | if (!conn) | |
1325 | return; | |
1326 | ||
1327 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1328 | ||
1329 | kfree_skb(conn->rx_skb); | |
1330 | ||
3df91ea2 AE |
1331 | mutex_lock(&conn->chan_lock); |
1332 | ||
5d3de7df VCG |
1333 | /* Kill channels */ |
1334 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1335 | l2cap_chan_hold(chan); |
6be36555 AE |
1336 | l2cap_chan_lock(chan); |
1337 | ||
5d3de7df | 1338 | l2cap_chan_del(chan, err); |
6be36555 AE |
1339 | |
1340 | l2cap_chan_unlock(chan); | |
1341 | ||
80b98027 | 1342 | chan->ops->close(chan); |
61d6ef3e | 1343 | l2cap_chan_put(chan); |
5d3de7df VCG |
1344 | } |
1345 | ||
3df91ea2 AE |
1346 | mutex_unlock(&conn->chan_lock); |
1347 | ||
73d80deb LAD |
1348 | hci_chan_del(conn->hchan); |
1349 | ||
5d3de7df | 1350 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1351 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1352 | |
51a8efd7 | 1353 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1354 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1355 | smp_chan_destroy(conn); |
d26a2345 | 1356 | } |
5d3de7df VCG |
1357 | |
1358 | hcon->l2cap_data = NULL; | |
1359 | kfree(conn); | |
1360 | } | |
1361 | ||
6c9d42a1 | 1362 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1363 | { |
6c9d42a1 | 1364 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1365 | security_timer.work); |
5d3de7df | 1366 | |
d06cc416 JH |
1367 | BT_DBG("conn %p", conn); |
1368 | ||
1369 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1370 | smp_chan_destroy(conn); | |
1371 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1372 | } | |
5d3de7df VCG |
1373 | } |
1374 | ||
1da177e4 LT |
1375 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1376 | { | |
0139418c | 1377 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1378 | struct hci_chan *hchan; |
1da177e4 | 1379 | |
0139418c | 1380 | if (conn || status) |
1da177e4 LT |
1381 | return conn; |
1382 | ||
73d80deb LAD |
1383 | hchan = hci_chan_create(hcon); |
1384 | if (!hchan) | |
1385 | return NULL; | |
1386 | ||
8bcde1f2 | 1387 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1388 | if (!conn) { |
1389 | hci_chan_del(hchan); | |
1da177e4 | 1390 | return NULL; |
73d80deb | 1391 | } |
1da177e4 LT |
1392 | |
1393 | hcon->l2cap_data = conn; | |
1394 | conn->hcon = hcon; | |
73d80deb | 1395 | conn->hchan = hchan; |
1da177e4 | 1396 | |
73d80deb | 1397 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1398 | |
dcc042d5 AE |
1399 | switch (hcon->type) { |
1400 | case AMP_LINK: | |
1401 | conn->mtu = hcon->hdev->block_mtu; | |
1402 | break; | |
1403 | ||
1404 | case LE_LINK: | |
1405 | if (hcon->hdev->le_mtu) { | |
1406 | conn->mtu = hcon->hdev->le_mtu; | |
1407 | break; | |
1408 | } | |
1409 | /* fall through */ | |
1410 | ||
1411 | default: | |
acd7d370 | 1412 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1413 | break; |
1414 | } | |
acd7d370 | 1415 | |
1da177e4 LT |
1416 | conn->src = &hcon->hdev->bdaddr; |
1417 | conn->dst = &hcon->dst; | |
1418 | ||
4e8402a3 MH |
1419 | conn->feat_mask = 0; |
1420 | ||
1da177e4 | 1421 | spin_lock_init(&conn->lock); |
3df91ea2 | 1422 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1423 | |
1424 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1425 | |
5d3de7df | 1426 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1427 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1428 | else |
030013d8 | 1429 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1430 | |
9f5a0d7b | 1431 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1432 | |
1da177e4 LT |
1433 | return conn; |
1434 | } | |
1435 | ||
1da177e4 | 1436 | /* ---- Socket interface ---- */ |
1da177e4 | 1437 | |
c2287681 | 1438 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1439 | * Returns closest match. |
1440 | */ | |
c2287681 IY |
1441 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1442 | bdaddr_t *src, | |
1443 | bdaddr_t *dst) | |
1da177e4 | 1444 | { |
23691d75 | 1445 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1446 | |
23691d75 | 1447 | read_lock(&chan_list_lock); |
e0f0cb56 | 1448 | |
23691d75 GP |
1449 | list_for_each_entry(c, &chan_list, global_l) { |
1450 | struct sock *sk = c->sk; | |
fe4128e0 | 1451 | |
89bc500e | 1452 | if (state && c->state != state) |
1da177e4 LT |
1453 | continue; |
1454 | ||
23691d75 | 1455 | if (c->psm == psm) { |
c2287681 IY |
1456 | int src_match, dst_match; |
1457 | int src_any, dst_any; | |
1458 | ||
1da177e4 | 1459 | /* Exact match. */ |
c2287681 IY |
1460 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1461 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1462 | if (src_match && dst_match) { | |
a7567b20 | 1463 | read_unlock(&chan_list_lock); |
23691d75 GP |
1464 | return c; |
1465 | } | |
1da177e4 LT |
1466 | |
1467 | /* Closest match */ | |
c2287681 IY |
1468 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1469 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1470 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1471 | (src_any && dst_any)) | |
23691d75 | 1472 | c1 = c; |
1da177e4 LT |
1473 | } |
1474 | } | |
1da177e4 | 1475 | |
23691d75 | 1476 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1477 | |
23691d75 | 1478 | return c1; |
1da177e4 LT |
1479 | } |
1480 | ||
8e9f9892 AG |
1481 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1482 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1483 | { |
5d41ce1d | 1484 | struct sock *sk = chan->sk; |
1da177e4 | 1485 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1486 | struct l2cap_conn *conn; |
1487 | struct hci_conn *hcon; | |
1488 | struct hci_dev *hdev; | |
09ab6f4c | 1489 | __u8 auth_type; |
44d0e48e | 1490 | int err; |
1da177e4 | 1491 | |
6ed93dc6 | 1492 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1493 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1494 | |
af05b30b GP |
1495 | hdev = hci_get_route(dst, src); |
1496 | if (!hdev) | |
1da177e4 LT |
1497 | return -EHOSTUNREACH; |
1498 | ||
09fd0de5 | 1499 | hci_dev_lock(hdev); |
1da177e4 | 1500 | |
6be36555 | 1501 | l2cap_chan_lock(chan); |
03a00194 GP |
1502 | |
1503 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1504 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1505 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1506 | err = -EINVAL; |
1507 | goto done; | |
1508 | } | |
1509 | ||
1510 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1511 | err = -EINVAL; | |
1512 | goto done; | |
1513 | } | |
1514 | ||
1515 | switch (chan->mode) { | |
1516 | case L2CAP_MODE_BASIC: | |
1517 | break; | |
1518 | case L2CAP_MODE_ERTM: | |
1519 | case L2CAP_MODE_STREAMING: | |
1520 | if (!disable_ertm) | |
1521 | break; | |
1522 | /* fall through */ | |
1523 | default: | |
1524 | err = -ENOTSUPP; | |
1525 | goto done; | |
1526 | } | |
1527 | ||
0797e01d | 1528 | switch (chan->state) { |
03a00194 GP |
1529 | case BT_CONNECT: |
1530 | case BT_CONNECT2: | |
1531 | case BT_CONFIG: | |
1532 | /* Already connecting */ | |
1533 | err = 0; | |
1534 | goto done; | |
1535 | ||
1536 | case BT_CONNECTED: | |
1537 | /* Already connected */ | |
1538 | err = -EISCONN; | |
1539 | goto done; | |
1540 | ||
1541 | case BT_OPEN: | |
1542 | case BT_BOUND: | |
1543 | /* Can connect */ | |
1544 | break; | |
1545 | ||
1546 | default: | |
1547 | err = -EBADFD; | |
1548 | goto done; | |
1549 | } | |
1550 | ||
1551 | /* Set destination address and psm */ | |
0797e01d | 1552 | lock_sock(sk); |
9219b2a0 | 1553 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1554 | release_sock(sk); |
1555 | ||
03a00194 GP |
1556 | chan->psm = psm; |
1557 | chan->dcid = cid; | |
1da177e4 | 1558 | |
4343478f | 1559 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1560 | |
fe4128e0 | 1561 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1562 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1563 | chan->sec_level, auth_type); |
acd7d370 | 1564 | else |
8e9f9892 | 1565 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1566 | chan->sec_level, auth_type); |
acd7d370 | 1567 | |
30e76272 VT |
1568 | if (IS_ERR(hcon)) { |
1569 | err = PTR_ERR(hcon); | |
1da177e4 | 1570 | goto done; |
30e76272 | 1571 | } |
1da177e4 LT |
1572 | |
1573 | conn = l2cap_conn_add(hcon, 0); | |
1574 | if (!conn) { | |
1575 | hci_conn_put(hcon); | |
30e76272 | 1576 | err = -ENOMEM; |
1da177e4 LT |
1577 | goto done; |
1578 | } | |
1579 | ||
9f0caeb1 VCG |
1580 | if (hcon->type == LE_LINK) { |
1581 | err = 0; | |
1582 | ||
1583 | if (!list_empty(&conn->chan_l)) { | |
1584 | err = -EBUSY; | |
1585 | hci_conn_put(hcon); | |
1586 | } | |
1587 | ||
1588 | if (err) | |
1589 | goto done; | |
1590 | } | |
1591 | ||
1da177e4 LT |
1592 | /* Update source addr of the socket */ |
1593 | bacpy(src, conn->src); | |
1594 | ||
6be36555 | 1595 | l2cap_chan_unlock(chan); |
48454079 | 1596 | l2cap_chan_add(conn, chan); |
6be36555 | 1597 | l2cap_chan_lock(chan); |
48454079 | 1598 | |
6be36555 | 1599 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1600 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1601 | |
1602 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1603 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1604 | __clear_chan_timer(chan); |
d45fc423 | 1605 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1606 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1607 | } else |
fc7f8a7e | 1608 | l2cap_do_start(chan); |
1da177e4 LT |
1609 | } |
1610 | ||
30e76272 VT |
1611 | err = 0; |
1612 | ||
1da177e4 | 1613 | done: |
6be36555 | 1614 | l2cap_chan_unlock(chan); |
09fd0de5 | 1615 | hci_dev_unlock(hdev); |
1da177e4 LT |
1616 | hci_dev_put(hdev); |
1617 | return err; | |
1618 | } | |
1619 | ||
dcba0dba | 1620 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1621 | { |
8c1d787b | 1622 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1623 | DECLARE_WAITQUEUE(wait, current); |
1624 | int err = 0; | |
1625 | int timeo = HZ/5; | |
1626 | ||
2b0b05dd | 1627 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1628 | set_current_state(TASK_INTERRUPTIBLE); |
1629 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1630 | if (!timeo) |
1631 | timeo = HZ/5; | |
1632 | ||
1633 | if (signal_pending(current)) { | |
1634 | err = sock_intr_errno(timeo); | |
1635 | break; | |
1636 | } | |
1637 | ||
1638 | release_sock(sk); | |
1639 | timeo = schedule_timeout(timeo); | |
1640 | lock_sock(sk); | |
a71a0cf4 | 1641 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1642 | |
1643 | err = sock_error(sk); | |
1644 | if (err) | |
1645 | break; | |
1646 | } | |
1647 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1648 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1649 | return err; |
1650 | } | |
1651 | ||
721c4181 | 1652 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1653 | { |
721c4181 | 1654 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1655 | monitor_timer.work); |
e90bac06 | 1656 | |
525cd185 | 1657 | BT_DBG("chan %p", chan); |
0e98958d | 1658 | |
6be36555 AE |
1659 | l2cap_chan_lock(chan); |
1660 | ||
80909e04 | 1661 | if (!chan->conn) { |
6be36555 | 1662 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1663 | l2cap_chan_put(chan); |
e90bac06 GP |
1664 | return; |
1665 | } | |
1666 | ||
401bb1f7 | 1667 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1668 | |
6be36555 | 1669 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1670 | l2cap_chan_put(chan); |
e90bac06 GP |
1671 | } |
1672 | ||
721c4181 | 1673 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1674 | { |
721c4181 | 1675 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1676 | retrans_timer.work); |
e90bac06 | 1677 | |
49208c9c | 1678 | BT_DBG("chan %p", chan); |
0e98958d | 1679 | |
6be36555 AE |
1680 | l2cap_chan_lock(chan); |
1681 | ||
80909e04 MM |
1682 | if (!chan->conn) { |
1683 | l2cap_chan_unlock(chan); | |
1684 | l2cap_chan_put(chan); | |
1685 | return; | |
1686 | } | |
6be36555 | 1687 | |
401bb1f7 | 1688 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1689 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1690 | l2cap_chan_put(chan); |
e90bac06 GP |
1691 | } |
1692 | ||
d660366d GP |
1693 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1694 | struct sk_buff_head *skbs) | |
6840ed07 | 1695 | { |
ccbb84af | 1696 | struct sk_buff *skb; |
3733937d | 1697 | struct l2cap_ctrl *control; |
6840ed07 | 1698 | |
3733937d MM |
1699 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1700 | ||
3733937d MM |
1701 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1702 | ||
1703 | while (!skb_queue_empty(&chan->tx_q)) { | |
1704 | ||
1705 | skb = skb_dequeue(&chan->tx_q); | |
1706 | ||
1707 | bt_cb(skb)->control.retries = 1; | |
1708 | control = &bt_cb(skb)->control; | |
1709 | ||
1710 | control->reqseq = 0; | |
1711 | control->txseq = chan->next_tx_seq; | |
1712 | ||
1713 | __pack_control(chan, control, skb); | |
6840ed07 | 1714 | |
47d1ec61 | 1715 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1716 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1717 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1718 | } |
1719 | ||
4343478f | 1720 | l2cap_do_send(chan, skb); |
6840ed07 | 1721 | |
b4400672 | 1722 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1723 | |
836be934 | 1724 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1725 | chan->frames_sent++; |
6840ed07 | 1726 | } |
6840ed07 GP |
1727 | } |
1728 | ||
67c9e840 | 1729 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1730 | { |
1731 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1732 | struct l2cap_ctrl *control; |
1733 | int sent = 0; | |
1734 | ||
1735 | BT_DBG("chan %p", chan); | |
1c2acffb | 1736 | |
89bc500e | 1737 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1738 | return -ENOTCONN; |
e90bac06 | 1739 | |
94122bbe MM |
1740 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1741 | return 0; | |
1742 | ||
18a48e76 MM |
1743 | while (chan->tx_send_head && |
1744 | chan->unacked_frames < chan->remote_tx_win && | |
1745 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1746 | |
18a48e76 | 1747 | skb = chan->tx_send_head; |
e90bac06 | 1748 | |
18a48e76 MM |
1749 | bt_cb(skb)->control.retries = 1; |
1750 | control = &bt_cb(skb)->control; | |
95ffa978 | 1751 | |
e2ab4353 | 1752 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1753 | control->final = 1; |
e2ab4353 | 1754 | |
18a48e76 MM |
1755 | control->reqseq = chan->buffer_seq; |
1756 | chan->last_acked_seq = chan->buffer_seq; | |
1757 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1758 | |
18a48e76 | 1759 | __pack_control(chan, control, skb); |
e90bac06 | 1760 | |
47d1ec61 | 1761 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1762 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1763 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1764 | } |
1765 | ||
18a48e76 MM |
1766 | /* Clone after data has been modified. Data is assumed to be |
1767 | read-only (for locking purposes) on cloned sk_buffs. | |
1768 | */ | |
1769 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1770 | |
18a48e76 MM |
1771 | if (!tx_skb) |
1772 | break; | |
1c2acffb | 1773 | |
18a48e76 | 1774 | __set_retrans_timer(chan); |
836be934 AE |
1775 | |
1776 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1777 | chan->unacked_frames++; |
6a026610 | 1778 | chan->frames_sent++; |
18a48e76 | 1779 | sent++; |
1c2acffb | 1780 | |
58d35f87 GP |
1781 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1782 | chan->tx_send_head = NULL; | |
1c2acffb | 1783 | else |
58d35f87 | 1784 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1785 | |
1786 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1787 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1788 | } |
1789 | ||
b4400672 AE |
1790 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1791 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1792 | |
1793 | return sent; | |
9e917af1 GP |
1794 | } |
1795 | ||
e1fbd4c1 MM |
1796 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1797 | { | |
1798 | struct l2cap_ctrl control; | |
1799 | struct sk_buff *skb; | |
1800 | struct sk_buff *tx_skb; | |
1801 | u16 seq; | |
1802 | ||
1803 | BT_DBG("chan %p", chan); | |
1804 | ||
1805 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1806 | return; | |
1807 | ||
1808 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1809 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1810 | ||
1811 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1812 | if (!skb) { | |
1813 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1814 | seq); |
e1fbd4c1 MM |
1815 | continue; |
1816 | } | |
1817 | ||
1818 | bt_cb(skb)->control.retries++; | |
1819 | control = bt_cb(skb)->control; | |
1820 | ||
1821 | if (chan->max_tx != 0 && | |
1822 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1823 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1824 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1825 | l2cap_seq_list_clear(&chan->retrans_list); | |
1826 | break; | |
1827 | } | |
1828 | ||
1829 | control.reqseq = chan->buffer_seq; | |
1830 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1831 | control.final = 1; | |
1832 | else | |
1833 | control.final = 0; | |
1834 | ||
1835 | if (skb_cloned(skb)) { | |
1836 | /* Cloned sk_buffs are read-only, so we need a | |
1837 | * writeable copy | |
1838 | */ | |
8bcde1f2 | 1839 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1840 | } else { |
8bcde1f2 | 1841 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1842 | } |
1843 | ||
1844 | if (!tx_skb) { | |
1845 | l2cap_seq_list_clear(&chan->retrans_list); | |
1846 | break; | |
1847 | } | |
1848 | ||
1849 | /* Update skb contents */ | |
1850 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1851 | put_unaligned_le32(__pack_extended_control(&control), | |
1852 | tx_skb->data + L2CAP_HDR_SIZE); | |
1853 | } else { | |
1854 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1855 | tx_skb->data + L2CAP_HDR_SIZE); | |
1856 | } | |
1857 | ||
1858 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1859 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1860 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1861 | L2CAP_FCS_SIZE)); | |
1862 | } | |
1863 | ||
1864 | l2cap_do_send(chan, tx_skb); | |
1865 | ||
1866 | BT_DBG("Resent txseq %d", control.txseq); | |
1867 | ||
1868 | chan->last_acked_seq = chan->buffer_seq; | |
1869 | } | |
1870 | } | |
1871 | ||
f80842a8 MM |
1872 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1873 | struct l2cap_ctrl *control) | |
1874 | { | |
1875 | BT_DBG("chan %p, control %p", chan, control); | |
1876 | ||
1877 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1878 | l2cap_ertm_resend(chan); | |
1879 | } | |
1880 | ||
d2a7ac5d MM |
1881 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1882 | struct l2cap_ctrl *control) | |
1883 | { | |
e1fbd4c1 MM |
1884 | struct sk_buff *skb; |
1885 | ||
1886 | BT_DBG("chan %p, control %p", chan, control); | |
1887 | ||
1888 | if (control->poll) | |
1889 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1890 | ||
1891 | l2cap_seq_list_clear(&chan->retrans_list); | |
1892 | ||
1893 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1894 | return; | |
1895 | ||
1896 | if (chan->unacked_frames) { | |
1897 | skb_queue_walk(&chan->tx_q, skb) { | |
1898 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 1899 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
1900 | break; |
1901 | } | |
1902 | ||
1903 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1904 | if (skb == chan->tx_send_head) | |
1905 | break; | |
1906 | ||
1907 | l2cap_seq_list_append(&chan->retrans_list, | |
1908 | bt_cb(skb)->control.txseq); | |
1909 | } | |
1910 | ||
1911 | l2cap_ertm_resend(chan); | |
1912 | } | |
d2a7ac5d MM |
1913 | } |
1914 | ||
0a0aba42 | 1915 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1916 | { |
0a0aba42 MM |
1917 | struct l2cap_ctrl control; |
1918 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1919 | chan->last_acked_seq); | |
1920 | int threshold; | |
9e917af1 | 1921 | |
0a0aba42 MM |
1922 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1923 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1924 | |
0a0aba42 MM |
1925 | memset(&control, 0, sizeof(control)); |
1926 | control.sframe = 1; | |
dfc909be | 1927 | |
0a0aba42 MM |
1928 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1929 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1930 | __clear_ack_timer(chan); | |
1931 | control.super = L2CAP_SUPER_RNR; | |
1932 | control.reqseq = chan->buffer_seq; | |
1933 | l2cap_send_sframe(chan, &control); | |
1934 | } else { | |
1935 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1936 | l2cap_ertm_send(chan); | |
1937 | /* If any i-frames were sent, they included an ack */ | |
1938 | if (chan->buffer_seq == chan->last_acked_seq) | |
1939 | frames_to_ack = 0; | |
1940 | } | |
dfc909be | 1941 | |
c20f8e35 | 1942 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
1943 | * Calculate without mul or div |
1944 | */ | |
c20f8e35 | 1945 | threshold = chan->ack_win; |
0a0aba42 MM |
1946 | threshold += threshold << 1; |
1947 | threshold >>= 2; | |
1948 | ||
b4400672 | 1949 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1950 | threshold); |
1951 | ||
1952 | if (frames_to_ack >= threshold) { | |
1953 | __clear_ack_timer(chan); | |
1954 | control.super = L2CAP_SUPER_RR; | |
1955 | control.reqseq = chan->buffer_seq; | |
1956 | l2cap_send_sframe(chan, &control); | |
1957 | frames_to_ack = 0; | |
1958 | } | |
1c2acffb | 1959 | |
0a0aba42 MM |
1960 | if (frames_to_ack) |
1961 | __set_ack_timer(chan); | |
1962 | } | |
b17e73bb SJ |
1963 | } |
1964 | ||
04124681 GP |
1965 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1966 | struct msghdr *msg, int len, | |
1967 | int count, struct sk_buff *skb) | |
1c2acffb | 1968 | { |
0952a57a | 1969 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1970 | struct sk_buff **frag; |
90338947 | 1971 | int sent = 0; |
1da177e4 | 1972 | |
59203a21 | 1973 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1974 | return -EFAULT; |
1da177e4 LT |
1975 | |
1976 | sent += count; | |
1977 | len -= count; | |
1978 | ||
1979 | /* Continuation fragments (no L2CAP header) */ | |
1980 | frag = &skb_shinfo(skb)->frag_list; | |
1981 | while (len) { | |
fbe00700 GP |
1982 | struct sk_buff *tmp; |
1983 | ||
1da177e4 LT |
1984 | count = min_t(unsigned int, conn->mtu, len); |
1985 | ||
fbe00700 GP |
1986 | tmp = chan->ops->alloc_skb(chan, count, |
1987 | msg->msg_flags & MSG_DONTWAIT); | |
1988 | if (IS_ERR(tmp)) | |
1989 | return PTR_ERR(tmp); | |
1990 | ||
1991 | *frag = tmp; | |
2f7719ce | 1992 | |
1c2acffb GP |
1993 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1994 | return -EFAULT; | |
1da177e4 | 1995 | |
5e59b791 LAD |
1996 | (*frag)->priority = skb->priority; |
1997 | ||
1da177e4 LT |
1998 | sent += count; |
1999 | len -= count; | |
2000 | ||
2d0ed3d5 GP |
2001 | skb->len += (*frag)->len; |
2002 | skb->data_len += (*frag)->len; | |
2003 | ||
1da177e4 LT |
2004 | frag = &(*frag)->next; |
2005 | } | |
1da177e4 LT |
2006 | |
2007 | return sent; | |
1c2acffb | 2008 | } |
1da177e4 | 2009 | |
5e59b791 | 2010 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2011 | struct msghdr *msg, size_t len, |
2012 | u32 priority) | |
1c2acffb | 2013 | { |
8c1d787b | 2014 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2015 | struct sk_buff *skb; |
03a51213 | 2016 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2017 | struct l2cap_hdr *lh; |
2018 | ||
b4400672 | 2019 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2020 | |
2021 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2022 | |
2023 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2024 | msg->msg_flags & MSG_DONTWAIT); |
2025 | if (IS_ERR(skb)) | |
2026 | return skb; | |
1c2acffb | 2027 | |
5e59b791 LAD |
2028 | skb->priority = priority; |
2029 | ||
1c2acffb GP |
2030 | /* Create L2CAP header */ |
2031 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2032 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2033 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2034 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2035 | |
0952a57a | 2036 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2037 | if (unlikely(err < 0)) { |
2038 | kfree_skb(skb); | |
2039 | return ERR_PTR(err); | |
2040 | } | |
2041 | return skb; | |
2042 | } | |
2043 | ||
5e59b791 | 2044 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2045 | struct msghdr *msg, size_t len, |
2046 | u32 priority) | |
1c2acffb | 2047 | { |
8c1d787b | 2048 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2049 | struct sk_buff *skb; |
f2ba7fae | 2050 | int err, count; |
1c2acffb GP |
2051 | struct l2cap_hdr *lh; |
2052 | ||
b4400672 | 2053 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2054 | |
f2ba7fae | 2055 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2056 | |
f2ba7fae | 2057 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2058 | msg->msg_flags & MSG_DONTWAIT); |
2059 | if (IS_ERR(skb)) | |
2060 | return skb; | |
1c2acffb | 2061 | |
5e59b791 LAD |
2062 | skb->priority = priority; |
2063 | ||
1c2acffb GP |
2064 | /* Create L2CAP header */ |
2065 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2066 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2067 | lh->len = cpu_to_le16(len); |
1c2acffb | 2068 | |
0952a57a | 2069 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2070 | if (unlikely(err < 0)) { |
2071 | kfree_skb(skb); | |
2072 | return ERR_PTR(err); | |
2073 | } | |
2074 | return skb; | |
2075 | } | |
2076 | ||
ab0ff76d | 2077 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2078 | struct msghdr *msg, size_t len, |
2079 | u16 sdulen) | |
1c2acffb | 2080 | { |
8c1d787b | 2081 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2082 | struct sk_buff *skb; |
e4ca6d98 | 2083 | int err, count, hlen; |
1c2acffb GP |
2084 | struct l2cap_hdr *lh; |
2085 | ||
b4400672 | 2086 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2087 | |
0ee0d208 GP |
2088 | if (!conn) |
2089 | return ERR_PTR(-ENOTCONN); | |
2090 | ||
ba7aa64f | 2091 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2092 | |
c74e560c | 2093 | if (sdulen) |
03a51213 | 2094 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2095 | |
47d1ec61 | 2096 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2097 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2098 | |
1c2acffb | 2099 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2100 | |
2101 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2102 | msg->msg_flags & MSG_DONTWAIT); |
2103 | if (IS_ERR(skb)) | |
2104 | return skb; | |
1c2acffb GP |
2105 | |
2106 | /* Create L2CAP header */ | |
2107 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2108 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2109 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2110 | |
18a48e76 MM |
2111 | /* Control header is populated later */ |
2112 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2113 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2114 | else | |
2115 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2116 | |
c74e560c | 2117 | if (sdulen) |
03a51213 | 2118 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2119 | |
0952a57a | 2120 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2121 | if (unlikely(err < 0)) { |
2122 | kfree_skb(skb); | |
2123 | return ERR_PTR(err); | |
2124 | } | |
e90bac06 | 2125 | |
18a48e76 | 2126 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2127 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2128 | return skb; |
1da177e4 LT |
2129 | } |
2130 | ||
94122bbe MM |
2131 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2132 | struct sk_buff_head *seg_queue, | |
2133 | struct msghdr *msg, size_t len) | |
c74e560c | 2134 | { |
c74e560c | 2135 | struct sk_buff *skb; |
94122bbe MM |
2136 | u16 sdu_len; |
2137 | size_t pdu_len; | |
94122bbe | 2138 | u8 sar; |
c74e560c | 2139 | |
b4400672 | 2140 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2141 | |
94122bbe MM |
2142 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2143 | * so fragmented skbs are not used. The HCI layer's handling | |
2144 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2145 | */ | |
c74e560c | 2146 | |
94122bbe MM |
2147 | /* PDU size is derived from the HCI MTU */ |
2148 | pdu_len = chan->conn->mtu; | |
c74e560c | 2149 | |
94122bbe MM |
2150 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2151 | ||
2152 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2153 | if (chan->fcs) |
2154 | pdu_len -= L2CAP_FCS_SIZE; | |
2155 | ||
ba7aa64f | 2156 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2157 | |
2158 | /* Remote device may have requested smaller PDUs */ | |
2159 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2160 | ||
2161 | if (len <= pdu_len) { | |
2162 | sar = L2CAP_SAR_UNSEGMENTED; | |
2163 | sdu_len = 0; | |
2164 | pdu_len = len; | |
2165 | } else { | |
2166 | sar = L2CAP_SAR_START; | |
2167 | sdu_len = len; | |
2168 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2169 | } | |
2170 | ||
2171 | while (len > 0) { | |
2172 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2173 | |
c74e560c | 2174 | if (IS_ERR(skb)) { |
94122bbe | 2175 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2176 | return PTR_ERR(skb); |
2177 | } | |
2178 | ||
94122bbe MM |
2179 | bt_cb(skb)->control.sar = sar; |
2180 | __skb_queue_tail(seg_queue, skb); | |
2181 | ||
2182 | len -= pdu_len; | |
2183 | if (sdu_len) { | |
2184 | sdu_len = 0; | |
2185 | pdu_len += L2CAP_SDULEN_SIZE; | |
2186 | } | |
2187 | ||
2188 | if (len <= pdu_len) { | |
2189 | sar = L2CAP_SAR_END; | |
2190 | pdu_len = len; | |
2191 | } else { | |
2192 | sar = L2CAP_SAR_CONTINUE; | |
2193 | } | |
c74e560c | 2194 | } |
c74e560c | 2195 | |
f0f62799 | 2196 | return 0; |
c74e560c GP |
2197 | } |
2198 | ||
5e59b791 | 2199 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2200 | u32 priority) |
9a91a04a | 2201 | { |
9a91a04a | 2202 | struct sk_buff *skb; |
9a91a04a | 2203 | int err; |
94122bbe | 2204 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2205 | |
2206 | /* Connectionless channel */ | |
715ec005 | 2207 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2208 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2209 | if (IS_ERR(skb)) |
2210 | return PTR_ERR(skb); | |
2211 | ||
2212 | l2cap_do_send(chan, skb); | |
2213 | return len; | |
2214 | } | |
2215 | ||
2216 | switch (chan->mode) { | |
2217 | case L2CAP_MODE_BASIC: | |
2218 | /* Check outgoing MTU */ | |
2219 | if (len > chan->omtu) | |
2220 | return -EMSGSIZE; | |
2221 | ||
2222 | /* Create a basic PDU */ | |
5e59b791 | 2223 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2224 | if (IS_ERR(skb)) |
2225 | return PTR_ERR(skb); | |
2226 | ||
2227 | l2cap_do_send(chan, skb); | |
2228 | err = len; | |
2229 | break; | |
2230 | ||
2231 | case L2CAP_MODE_ERTM: | |
2232 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2233 | /* Check outgoing MTU */ |
2234 | if (len > chan->omtu) { | |
2235 | err = -EMSGSIZE; | |
2236 | break; | |
2237 | } | |
9a91a04a | 2238 | |
94122bbe | 2239 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2240 | |
94122bbe MM |
2241 | /* Do segmentation before calling in to the state machine, |
2242 | * since it's possible to block while waiting for memory | |
2243 | * allocation. | |
2244 | */ | |
2245 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2246 | |
94122bbe MM |
2247 | /* The channel could have been closed while segmenting, |
2248 | * check that it is still connected. | |
2249 | */ | |
2250 | if (chan->state != BT_CONNECTED) { | |
2251 | __skb_queue_purge(&seg_queue); | |
2252 | err = -ENOTCONN; | |
9a91a04a GP |
2253 | } |
2254 | ||
94122bbe | 2255 | if (err) |
9a91a04a | 2256 | break; |
9a91a04a | 2257 | |
3733937d | 2258 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2259 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2260 | else |
d660366d | 2261 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2262 | |
d660366d | 2263 | err = len; |
9a91a04a | 2264 | |
94122bbe MM |
2265 | /* If the skbs were not queued for sending, they'll still be in |
2266 | * seg_queue and need to be purged. | |
2267 | */ | |
2268 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2269 | break; |
2270 | ||
2271 | default: | |
2272 | BT_DBG("bad state %1.1x", chan->mode); | |
2273 | err = -EBADFD; | |
2274 | } | |
2275 | ||
2276 | return err; | |
2277 | } | |
2278 | ||
d2a7ac5d MM |
2279 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2280 | { | |
bed68bde MM |
2281 | struct l2cap_ctrl control; |
2282 | u16 seq; | |
2283 | ||
b4400672 | 2284 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2285 | |
2286 | memset(&control, 0, sizeof(control)); | |
2287 | control.sframe = 1; | |
2288 | control.super = L2CAP_SUPER_SREJ; | |
2289 | ||
2290 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2291 | seq = __next_seq(chan, seq)) { | |
2292 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2293 | control.reqseq = seq; | |
2294 | l2cap_send_sframe(chan, &control); | |
2295 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2300 | } |
2301 | ||
2302 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2303 | { | |
bed68bde MM |
2304 | struct l2cap_ctrl control; |
2305 | ||
2306 | BT_DBG("chan %p", chan); | |
2307 | ||
2308 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2309 | return; | |
2310 | ||
2311 | memset(&control, 0, sizeof(control)); | |
2312 | control.sframe = 1; | |
2313 | control.super = L2CAP_SUPER_SREJ; | |
2314 | control.reqseq = chan->srej_list.tail; | |
2315 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2316 | } |
2317 | ||
2318 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2319 | { | |
bed68bde MM |
2320 | struct l2cap_ctrl control; |
2321 | u16 initial_head; | |
2322 | u16 seq; | |
2323 | ||
b4400672 | 2324 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2325 | |
2326 | memset(&control, 0, sizeof(control)); | |
2327 | control.sframe = 1; | |
2328 | control.super = L2CAP_SUPER_SREJ; | |
2329 | ||
2330 | /* Capture initial list head to allow only one pass through the list. */ | |
2331 | initial_head = chan->srej_list.head; | |
2332 | ||
2333 | do { | |
2334 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2335 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2336 | break; | |
2337 | ||
2338 | control.reqseq = seq; | |
2339 | l2cap_send_sframe(chan, &control); | |
2340 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2341 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2342 | } |
2343 | ||
608bcc6d MM |
2344 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2345 | { | |
2346 | struct sk_buff *acked_skb; | |
2347 | u16 ackseq; | |
2348 | ||
b4400672 | 2349 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2350 | |
2351 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2352 | return; | |
2353 | ||
b4400672 | 2354 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2355 | chan->expected_ack_seq, chan->unacked_frames); |
2356 | ||
2357 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2358 | ackseq = __next_seq(chan, ackseq)) { | |
2359 | ||
2360 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2361 | if (acked_skb) { | |
2362 | skb_unlink(acked_skb, &chan->tx_q); | |
2363 | kfree_skb(acked_skb); | |
2364 | chan->unacked_frames--; | |
2365 | } | |
2366 | } | |
2367 | ||
2368 | chan->expected_ack_seq = reqseq; | |
2369 | ||
2370 | if (chan->unacked_frames == 0) | |
2371 | __clear_retrans_timer(chan); | |
2372 | ||
b4400672 | 2373 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2374 | } |
2375 | ||
2376 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2377 | { | |
2378 | BT_DBG("chan %p", chan); | |
2379 | ||
2380 | chan->expected_tx_seq = chan->buffer_seq; | |
2381 | l2cap_seq_list_clear(&chan->srej_list); | |
2382 | skb_queue_purge(&chan->srej_q); | |
2383 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2384 | } | |
2385 | ||
d660366d GP |
2386 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2387 | struct l2cap_ctrl *control, | |
2388 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2389 | { |
608bcc6d MM |
2390 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2391 | event); | |
2392 | ||
2393 | switch (event) { | |
2394 | case L2CAP_EV_DATA_REQUEST: | |
2395 | if (chan->tx_send_head == NULL) | |
2396 | chan->tx_send_head = skb_peek(skbs); | |
2397 | ||
2398 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2399 | l2cap_ertm_send(chan); | |
2400 | break; | |
2401 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2402 | BT_DBG("Enter LOCAL_BUSY"); | |
2403 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2404 | ||
2405 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2406 | /* The SREJ_SENT state must be aborted if we are to | |
2407 | * enter the LOCAL_BUSY state. | |
2408 | */ | |
2409 | l2cap_abort_rx_srej_sent(chan); | |
2410 | } | |
2411 | ||
2412 | l2cap_send_ack(chan); | |
2413 | ||
2414 | break; | |
2415 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2416 | BT_DBG("Exit LOCAL_BUSY"); | |
2417 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2418 | ||
2419 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2420 | struct l2cap_ctrl local_control; | |
2421 | ||
2422 | memset(&local_control, 0, sizeof(local_control)); | |
2423 | local_control.sframe = 1; | |
2424 | local_control.super = L2CAP_SUPER_RR; | |
2425 | local_control.poll = 1; | |
2426 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2427 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2428 | |
2429 | chan->retry_count = 1; | |
2430 | __set_monitor_timer(chan); | |
2431 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2432 | } | |
2433 | break; | |
2434 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2435 | l2cap_process_reqseq(chan, control->reqseq); | |
2436 | break; | |
2437 | case L2CAP_EV_EXPLICIT_POLL: | |
2438 | l2cap_send_rr_or_rnr(chan, 1); | |
2439 | chan->retry_count = 1; | |
2440 | __set_monitor_timer(chan); | |
2441 | __clear_ack_timer(chan); | |
2442 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2443 | break; | |
2444 | case L2CAP_EV_RETRANS_TO: | |
2445 | l2cap_send_rr_or_rnr(chan, 1); | |
2446 | chan->retry_count = 1; | |
2447 | __set_monitor_timer(chan); | |
2448 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2449 | break; | |
2450 | case L2CAP_EV_RECV_FBIT: | |
2451 | /* Nothing to process */ | |
2452 | break; | |
2453 | default: | |
2454 | break; | |
2455 | } | |
608bcc6d MM |
2456 | } |
2457 | ||
d660366d GP |
2458 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2459 | struct l2cap_ctrl *control, | |
2460 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2461 | { |
608bcc6d MM |
2462 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2463 | event); | |
2464 | ||
2465 | switch (event) { | |
2466 | case L2CAP_EV_DATA_REQUEST: | |
2467 | if (chan->tx_send_head == NULL) | |
2468 | chan->tx_send_head = skb_peek(skbs); | |
2469 | /* Queue data, but don't send. */ | |
2470 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2471 | break; | |
2472 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2473 | BT_DBG("Enter LOCAL_BUSY"); | |
2474 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2475 | ||
2476 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2477 | /* The SREJ_SENT state must be aborted if we are to | |
2478 | * enter the LOCAL_BUSY state. | |
2479 | */ | |
2480 | l2cap_abort_rx_srej_sent(chan); | |
2481 | } | |
2482 | ||
2483 | l2cap_send_ack(chan); | |
2484 | ||
2485 | break; | |
2486 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2487 | BT_DBG("Exit LOCAL_BUSY"); | |
2488 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2489 | ||
2490 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2491 | struct l2cap_ctrl local_control; | |
2492 | memset(&local_control, 0, sizeof(local_control)); | |
2493 | local_control.sframe = 1; | |
2494 | local_control.super = L2CAP_SUPER_RR; | |
2495 | local_control.poll = 1; | |
2496 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2497 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2498 | |
2499 | chan->retry_count = 1; | |
2500 | __set_monitor_timer(chan); | |
2501 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2502 | } | |
2503 | break; | |
2504 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2505 | l2cap_process_reqseq(chan, control->reqseq); | |
2506 | ||
2507 | /* Fall through */ | |
2508 | ||
2509 | case L2CAP_EV_RECV_FBIT: | |
2510 | if (control && control->final) { | |
2511 | __clear_monitor_timer(chan); | |
2512 | if (chan->unacked_frames > 0) | |
2513 | __set_retrans_timer(chan); | |
2514 | chan->retry_count = 0; | |
2515 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2516 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2517 | } | |
2518 | break; | |
2519 | case L2CAP_EV_EXPLICIT_POLL: | |
2520 | /* Ignore */ | |
2521 | break; | |
2522 | case L2CAP_EV_MONITOR_TO: | |
2523 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2524 | l2cap_send_rr_or_rnr(chan, 1); | |
2525 | __set_monitor_timer(chan); | |
2526 | chan->retry_count++; | |
2527 | } else { | |
2528 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2529 | } | |
2530 | break; | |
2531 | default: | |
2532 | break; | |
2533 | } | |
608bcc6d MM |
2534 | } |
2535 | ||
d660366d GP |
2536 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2537 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2538 | { |
608bcc6d MM |
2539 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2540 | chan, control, skbs, event, chan->tx_state); | |
2541 | ||
2542 | switch (chan->tx_state) { | |
2543 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2544 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2545 | break; |
2546 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2547 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2548 | break; |
2549 | default: | |
2550 | /* Ignore event */ | |
2551 | break; | |
2552 | } | |
608bcc6d MM |
2553 | } |
2554 | ||
4b51dae9 MM |
2555 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2556 | struct l2cap_ctrl *control) | |
2557 | { | |
2558 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2559 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2560 | } |
2561 | ||
f80842a8 MM |
2562 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2563 | struct l2cap_ctrl *control) | |
2564 | { | |
2565 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2566 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2567 | } |
2568 | ||
1da177e4 LT |
2569 | /* Copy frame to all raw sockets on that connection */ |
2570 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2571 | { | |
1da177e4 | 2572 | struct sk_buff *nskb; |
48454079 | 2573 | struct l2cap_chan *chan; |
1da177e4 LT |
2574 | |
2575 | BT_DBG("conn %p", conn); | |
2576 | ||
3df91ea2 | 2577 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2578 | |
3df91ea2 | 2579 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2580 | struct sock *sk = chan->sk; |
715ec005 | 2581 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2582 | continue; |
2583 | ||
2584 | /* Don't send frame to the socket it came from */ | |
2585 | if (skb->sk == sk) | |
2586 | continue; | |
8bcde1f2 | 2587 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2588 | if (!nskb) |
1da177e4 LT |
2589 | continue; |
2590 | ||
80b98027 | 2591 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2592 | kfree_skb(nskb); |
2593 | } | |
3d57dc68 | 2594 | |
3df91ea2 | 2595 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2596 | } |
2597 | ||
2598 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2599 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2600 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2601 | { |
2602 | struct sk_buff *skb, **frag; | |
2603 | struct l2cap_cmd_hdr *cmd; | |
2604 | struct l2cap_hdr *lh; | |
2605 | int len, count; | |
2606 | ||
b4400672 AE |
2607 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2608 | conn, code, ident, dlen); | |
1da177e4 LT |
2609 | |
2610 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2611 | count = min_t(unsigned int, conn->mtu, len); | |
2612 | ||
8bcde1f2 | 2613 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2614 | if (!skb) |
2615 | return NULL; | |
2616 | ||
2617 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2618 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2619 | |
2620 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2621 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2622 | else |
ac73498c | 2623 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2624 | |
2625 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2626 | cmd->code = code; | |
2627 | cmd->ident = ident; | |
aca3192c | 2628 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2629 | |
2630 | if (dlen) { | |
2631 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2632 | memcpy(skb_put(skb, count), data, count); | |
2633 | data += count; | |
2634 | } | |
2635 | ||
2636 | len -= skb->len; | |
2637 | ||
2638 | /* Continuation fragments (no L2CAP header) */ | |
2639 | frag = &skb_shinfo(skb)->frag_list; | |
2640 | while (len) { | |
2641 | count = min_t(unsigned int, conn->mtu, len); | |
2642 | ||
8bcde1f2 | 2643 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2644 | if (!*frag) |
2645 | goto fail; | |
2646 | ||
2647 | memcpy(skb_put(*frag, count), data, count); | |
2648 | ||
2649 | len -= count; | |
2650 | data += count; | |
2651 | ||
2652 | frag = &(*frag)->next; | |
2653 | } | |
2654 | ||
2655 | return skb; | |
2656 | ||
2657 | fail: | |
2658 | kfree_skb(skb); | |
2659 | return NULL; | |
2660 | } | |
2661 | ||
2d792818 GP |
2662 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2663 | unsigned long *val) | |
1da177e4 LT |
2664 | { |
2665 | struct l2cap_conf_opt *opt = *ptr; | |
2666 | int len; | |
2667 | ||
2668 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2669 | *ptr += len; | |
2670 | ||
2671 | *type = opt->type; | |
2672 | *olen = opt->len; | |
2673 | ||
2674 | switch (opt->len) { | |
2675 | case 1: | |
2676 | *val = *((u8 *) opt->val); | |
2677 | break; | |
2678 | ||
2679 | case 2: | |
bfaaeb3e | 2680 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2681 | break; |
2682 | ||
2683 | case 4: | |
bfaaeb3e | 2684 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2685 | break; |
2686 | ||
2687 | default: | |
2688 | *val = (unsigned long) opt->val; | |
2689 | break; | |
2690 | } | |
2691 | ||
b4400672 | 2692 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2693 | return len; |
2694 | } | |
2695 | ||
1da177e4 LT |
2696 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2697 | { | |
2698 | struct l2cap_conf_opt *opt = *ptr; | |
2699 | ||
b4400672 | 2700 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2701 | |
2702 | opt->type = type; | |
2703 | opt->len = len; | |
2704 | ||
2705 | switch (len) { | |
2706 | case 1: | |
2707 | *((u8 *) opt->val) = val; | |
2708 | break; | |
2709 | ||
2710 | case 2: | |
4f8b691c | 2711 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2712 | break; |
2713 | ||
2714 | case 4: | |
4f8b691c | 2715 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2716 | break; |
2717 | ||
2718 | default: | |
2719 | memcpy(opt->val, (void *) val, len); | |
2720 | break; | |
2721 | } | |
2722 | ||
2723 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2724 | } | |
2725 | ||
f89cef09 AE |
2726 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2727 | { | |
2728 | struct l2cap_conf_efs efs; | |
2729 | ||
1ec918ce | 2730 | switch (chan->mode) { |
f89cef09 AE |
2731 | case L2CAP_MODE_ERTM: |
2732 | efs.id = chan->local_id; | |
2733 | efs.stype = chan->local_stype; | |
2734 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2735 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2736 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2737 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2738 | break; |
2739 | ||
2740 | case L2CAP_MODE_STREAMING: | |
2741 | efs.id = 1; | |
2742 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2743 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2744 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2745 | efs.acc_lat = 0; | |
2746 | efs.flush_to = 0; | |
2747 | break; | |
2748 | ||
2749 | default: | |
2750 | return; | |
2751 | } | |
2752 | ||
2753 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2754 | (unsigned long) &efs); |
f89cef09 AE |
2755 | } |
2756 | ||
721c4181 | 2757 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2758 | { |
721c4181 | 2759 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2760 | ack_timer.work); |
2761 | u16 frames_to_ack; | |
c1b4f43b | 2762 | |
2fb9b3d4 GP |
2763 | BT_DBG("chan %p", chan); |
2764 | ||
6be36555 AE |
2765 | l2cap_chan_lock(chan); |
2766 | ||
0362520b MM |
2767 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2768 | chan->last_acked_seq); | |
6be36555 | 2769 | |
0362520b MM |
2770 | if (frames_to_ack) |
2771 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2772 | |
0362520b | 2773 | l2cap_chan_unlock(chan); |
09bfb2ee | 2774 | l2cap_chan_put(chan); |
c1b4f43b GP |
2775 | } |
2776 | ||
466f8004 | 2777 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2778 | { |
3c588192 MM |
2779 | int err; |
2780 | ||
105bdf9e MM |
2781 | chan->next_tx_seq = 0; |
2782 | chan->expected_tx_seq = 0; | |
42e5c802 | 2783 | chan->expected_ack_seq = 0; |
6a026610 | 2784 | chan->unacked_frames = 0; |
42e5c802 | 2785 | chan->buffer_seq = 0; |
6a026610 | 2786 | chan->frames_sent = 0; |
105bdf9e MM |
2787 | chan->last_acked_seq = 0; |
2788 | chan->sdu = NULL; | |
2789 | chan->sdu_last_frag = NULL; | |
2790 | chan->sdu_len = 0; | |
2791 | ||
d34c34fb MM |
2792 | skb_queue_head_init(&chan->tx_q); |
2793 | ||
105bdf9e MM |
2794 | if (chan->mode != L2CAP_MODE_ERTM) |
2795 | return 0; | |
2796 | ||
2797 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2798 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2799 | |
721c4181 GP |
2800 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2801 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2802 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2803 | |
f1c6775b | 2804 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2805 | |
3c588192 MM |
2806 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2807 | if (err < 0) | |
2808 | return err; | |
2809 | ||
9dc9affc MM |
2810 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2811 | if (err < 0) | |
2812 | l2cap_seq_list_free(&chan->srej_list); | |
2813 | ||
2814 | return err; | |
0565c1c2 GP |
2815 | } |
2816 | ||
f2fcfcd6 GP |
2817 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2818 | { | |
2819 | switch (mode) { | |
2820 | case L2CAP_MODE_STREAMING: | |
2821 | case L2CAP_MODE_ERTM: | |
2822 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2823 | return mode; | |
2824 | /* fall through */ | |
2825 | default: | |
2826 | return L2CAP_MODE_BASIC; | |
2827 | } | |
2828 | } | |
2829 | ||
6327eb98 AE |
2830 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2831 | { | |
2832 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2833 | } | |
2834 | ||
f89cef09 AE |
2835 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2836 | { | |
2837 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2838 | } | |
2839 | ||
6327eb98 AE |
2840 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2841 | { | |
2842 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
2d792818 | 2843 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2844 | /* use extended control field */ |
2845 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2846 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2847 | } else { | |
6327eb98 | 2848 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 2849 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
2850 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2851 | } | |
c20f8e35 | 2852 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2853 | } |
2854 | ||
710f9b0a | 2855 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2856 | { |
1da177e4 | 2857 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2858 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2859 | void *ptr = req->data; |
c8f79162 | 2860 | u16 size; |
1da177e4 | 2861 | |
49208c9c | 2862 | BT_DBG("chan %p", chan); |
1da177e4 | 2863 | |
73ffa904 | 2864 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2865 | goto done; |
2866 | ||
0c1bc5c6 | 2867 | switch (chan->mode) { |
f2fcfcd6 GP |
2868 | case L2CAP_MODE_STREAMING: |
2869 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2870 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2871 | break; |
85eb53c6 | 2872 | |
f89cef09 AE |
2873 | if (__l2cap_efs_supported(chan)) |
2874 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2875 | ||
2ba13ed6 | 2876 | /* fall through */ |
f2fcfcd6 | 2877 | default: |
8c1d787b | 2878 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2879 | break; |
2880 | } | |
2881 | ||
2882 | done: | |
0c1bc5c6 GP |
2883 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2884 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2885 | |
0c1bc5c6 | 2886 | switch (chan->mode) { |
65c7c491 | 2887 | case L2CAP_MODE_BASIC: |
8c1d787b | 2888 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 2889 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
2890 | break; |
2891 | ||
62547752 GP |
2892 | rfc.mode = L2CAP_MODE_BASIC; |
2893 | rfc.txwin_size = 0; | |
2894 | rfc.max_transmit = 0; | |
2895 | rfc.retrans_timeout = 0; | |
2896 | rfc.monitor_timeout = 0; | |
2897 | rfc.max_pdu_size = 0; | |
2898 | ||
63406504 | 2899 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2900 | (unsigned long) &rfc); |
65c7c491 MH |
2901 | break; |
2902 | ||
2903 | case L2CAP_MODE_ERTM: | |
2904 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2905 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2906 | rfc.retrans_timeout = 0; |
2907 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2908 | |
2909 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2910 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2911 | L2CAP_FCS_SIZE); | |
c8f79162 | 2912 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 2913 | |
6327eb98 AE |
2914 | l2cap_txwin_setup(chan); |
2915 | ||
2916 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 2917 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 2918 | |
63406504 | 2919 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2920 | (unsigned long) &rfc); |
63406504 | 2921 | |
f89cef09 AE |
2922 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2923 | l2cap_add_opt_efs(&ptr, chan); | |
2924 | ||
8c1d787b | 2925 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2926 | break; |
2927 | ||
47d1ec61 | 2928 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2929 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2930 | chan->fcs = L2CAP_FCS_NONE; |
2931 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2932 | } |
6327eb98 AE |
2933 | |
2934 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2935 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 2936 | chan->tx_win); |
f2fcfcd6 GP |
2937 | break; |
2938 | ||
2939 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2940 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2941 | rfc.mode = L2CAP_MODE_STREAMING; |
2942 | rfc.txwin_size = 0; | |
2943 | rfc.max_transmit = 0; | |
2944 | rfc.retrans_timeout = 0; | |
2945 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2946 | |
2947 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2948 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2949 | L2CAP_FCS_SIZE); | |
c8f79162 | 2950 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 2951 | |
63406504 | 2952 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2953 | (unsigned long) &rfc); |
63406504 | 2954 | |
f89cef09 AE |
2955 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2956 | l2cap_add_opt_efs(&ptr, chan); | |
2957 | ||
8c1d787b | 2958 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2959 | break; |
2960 | ||
47d1ec61 | 2961 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2962 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2963 | chan->fcs = L2CAP_FCS_NONE; |
2964 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2965 | } |
65c7c491 MH |
2966 | break; |
2967 | } | |
1da177e4 | 2968 | |
fe4128e0 | 2969 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2970 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2971 | |
2972 | return ptr - data; | |
2973 | } | |
2974 | ||
73ffa904 | 2975 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2976 | { |
5dee9e7c MH |
2977 | struct l2cap_conf_rsp *rsp = data; |
2978 | void *ptr = rsp->data; | |
73ffa904 GP |
2979 | void *req = chan->conf_req; |
2980 | int len = chan->conf_len; | |
5dee9e7c MH |
2981 | int type, hint, olen; |
2982 | unsigned long val; | |
6464f35f | 2983 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2984 | struct l2cap_conf_efs efs; |
2985 | u8 remote_efs = 0; | |
861d6882 | 2986 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2987 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2988 | u16 size; |
1da177e4 | 2989 | |
73ffa904 | 2990 | BT_DBG("chan %p", chan); |
820ae1b8 | 2991 | |
5dee9e7c MH |
2992 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2993 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2994 | |
589d2746 | 2995 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2996 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2997 | |
2998 | switch (type) { | |
2999 | case L2CAP_CONF_MTU: | |
861d6882 | 3000 | mtu = val; |
5dee9e7c MH |
3001 | break; |
3002 | ||
3003 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3004 | chan->flush_to = val; |
5dee9e7c MH |
3005 | break; |
3006 | ||
3007 | case L2CAP_CONF_QOS: | |
3008 | break; | |
3009 | ||
6464f35f MH |
3010 | case L2CAP_CONF_RFC: |
3011 | if (olen == sizeof(rfc)) | |
3012 | memcpy(&rfc, (void *) val, olen); | |
3013 | break; | |
3014 | ||
fcc203c3 GP |
3015 | case L2CAP_CONF_FCS: |
3016 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3017 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3018 | break; |
fcc203c3 | 3019 | |
42dceae2 AE |
3020 | case L2CAP_CONF_EFS: |
3021 | remote_efs = 1; | |
3022 | if (olen == sizeof(efs)) | |
3023 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3024 | break; |
3025 | ||
6327eb98 AE |
3026 | case L2CAP_CONF_EWS: |
3027 | if (!enable_hs) | |
3028 | return -ECONNREFUSED; | |
fcc203c3 | 3029 | |
6327eb98 AE |
3030 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3031 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3032 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3033 | chan->remote_tx_win = val; |
fcc203c3 GP |
3034 | break; |
3035 | ||
5dee9e7c MH |
3036 | default: |
3037 | if (hint) | |
3038 | break; | |
3039 | ||
3040 | result = L2CAP_CONF_UNKNOWN; | |
3041 | *((u8 *) ptr++) = type; | |
3042 | break; | |
3043 | } | |
3044 | } | |
3045 | ||
73ffa904 | 3046 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3047 | goto done; |
3048 | ||
0c1bc5c6 | 3049 | switch (chan->mode) { |
f2fcfcd6 GP |
3050 | case L2CAP_MODE_STREAMING: |
3051 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3052 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3053 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3054 | chan->conn->feat_mask); |
85eb53c6 GP |
3055 | break; |
3056 | } | |
3057 | ||
42dceae2 AE |
3058 | if (remote_efs) { |
3059 | if (__l2cap_efs_supported(chan)) | |
3060 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3061 | else | |
3062 | return -ECONNREFUSED; | |
3063 | } | |
3064 | ||
0c1bc5c6 | 3065 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3066 | return -ECONNREFUSED; |
742e519b | 3067 | |
f2fcfcd6 | 3068 | break; |
f2fcfcd6 GP |
3069 | } |
3070 | ||
3071 | done: | |
0c1bc5c6 | 3072 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3073 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3074 | rfc.mode = chan->mode; |
f2fcfcd6 | 3075 | |
73ffa904 | 3076 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3077 | return -ECONNREFUSED; |
3078 | ||
2d792818 GP |
3079 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3080 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3081 | } |
3082 | ||
5dee9e7c MH |
3083 | if (result == L2CAP_CONF_SUCCESS) { |
3084 | /* Configure output options and let the other side know | |
3085 | * which ones we don't like. */ | |
3086 | ||
f2fcfcd6 GP |
3087 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3088 | result = L2CAP_CONF_UNACCEPT; | |
3089 | else { | |
0c1bc5c6 | 3090 | chan->omtu = mtu; |
c1360a1c | 3091 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3092 | } |
0c1bc5c6 | 3093 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3094 | |
42dceae2 AE |
3095 | if (remote_efs) { |
3096 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3097 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3098 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3099 | |
3100 | result = L2CAP_CONF_UNACCEPT; | |
3101 | ||
3102 | if (chan->num_conf_req >= 1) | |
3103 | return -ECONNREFUSED; | |
3104 | ||
3105 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3106 | sizeof(efs), |
3107 | (unsigned long) &efs); | |
0e8b207e | 3108 | } else { |
3e6b3b95 | 3109 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3110 | result = L2CAP_CONF_PENDING; |
3111 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3112 | } |
3113 | } | |
3114 | ||
f2fcfcd6 GP |
3115 | switch (rfc.mode) { |
3116 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3117 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3118 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3119 | break; |
3120 | ||
3121 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3122 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3123 | chan->remote_tx_win = rfc.txwin_size; | |
3124 | else | |
3125 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3126 | |
2c03a7a4 | 3127 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3128 | |
c8f79162 | 3129 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3130 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3131 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3132 | rfc.max_pdu_size = cpu_to_le16(size); |
3133 | chan->remote_mps = size; | |
f2fcfcd6 | 3134 | |
10467e9e | 3135 | rfc.retrans_timeout = |
4fd21a88 | 3136 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3137 | rfc.monitor_timeout = |
4fd21a88 | 3138 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3139 | |
c1360a1c | 3140 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3141 | |
3142 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3143 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3144 | |
42dceae2 AE |
3145 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3146 | chan->remote_id = efs.id; | |
3147 | chan->remote_stype = efs.stype; | |
3148 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3149 | chan->remote_flush_to = | |
2d792818 | 3150 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3151 | chan->remote_acc_lat = |
2d792818 | 3152 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3153 | chan->remote_sdu_itime = |
3154 | le32_to_cpu(efs.sdu_itime); | |
3155 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3156 | sizeof(efs), |
3157 | (unsigned long) &efs); | |
42dceae2 | 3158 | } |
f2fcfcd6 GP |
3159 | break; |
3160 | ||
3161 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3162 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3163 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3164 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3165 | rfc.max_pdu_size = cpu_to_le16(size); |
3166 | chan->remote_mps = size; | |
f2fcfcd6 | 3167 | |
c1360a1c | 3168 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3169 | |
2d792818 GP |
3170 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3171 | (unsigned long) &rfc); | |
68ae6639 | 3172 | |
f2fcfcd6 GP |
3173 | break; |
3174 | ||
3175 | default: | |
5dee9e7c | 3176 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3177 | |
6464f35f | 3178 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3179 | rfc.mode = chan->mode; |
f2fcfcd6 | 3180 | } |
6464f35f | 3181 | |
f2fcfcd6 | 3182 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3183 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3184 | } |
fe4128e0 | 3185 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3186 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3187 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3188 | |
3189 | return ptr - data; | |
1da177e4 LT |
3190 | } |
3191 | ||
2d792818 GP |
3192 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3193 | void *data, u16 *result) | |
f2fcfcd6 | 3194 | { |
f2fcfcd6 GP |
3195 | struct l2cap_conf_req *req = data; |
3196 | void *ptr = req->data; | |
3197 | int type, olen; | |
3198 | unsigned long val; | |
36e999a8 | 3199 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3200 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3201 | |
fe4128e0 | 3202 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3203 | |
3204 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3205 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3206 | ||
3207 | switch (type) { | |
3208 | case L2CAP_CONF_MTU: | |
3209 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3210 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3211 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3212 | } else |
0c1bc5c6 GP |
3213 | chan->imtu = val; |
3214 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3215 | break; |
3216 | ||
3217 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3218 | chan->flush_to = val; |
f2fcfcd6 | 3219 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3220 | 2, chan->flush_to); |
f2fcfcd6 GP |
3221 | break; |
3222 | ||
3223 | case L2CAP_CONF_RFC: | |
3224 | if (olen == sizeof(rfc)) | |
3225 | memcpy(&rfc, (void *)val, olen); | |
3226 | ||
c1360a1c | 3227 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3228 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3229 | return -ECONNREFUSED; |
3230 | ||
47d1ec61 | 3231 | chan->fcs = 0; |
f2fcfcd6 GP |
3232 | |
3233 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3234 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3235 | break; |
6327eb98 AE |
3236 | |
3237 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3238 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3239 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3240 | chan->tx_win); |
6327eb98 | 3241 | break; |
66af7aaf AE |
3242 | |
3243 | case L2CAP_CONF_EFS: | |
3244 | if (olen == sizeof(efs)) | |
3245 | memcpy(&efs, (void *)val, olen); | |
3246 | ||
3247 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3248 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3249 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3250 | return -ECONNREFUSED; |
3251 | ||
2d792818 GP |
3252 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3253 | (unsigned long) &efs); | |
66af7aaf | 3254 | break; |
f2fcfcd6 GP |
3255 | } |
3256 | } | |
3257 | ||
0c1bc5c6 | 3258 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3259 | return -ECONNREFUSED; |
3260 | ||
0c1bc5c6 | 3261 | chan->mode = rfc.mode; |
6c2ea7a8 | 3262 | |
0e8b207e | 3263 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3264 | switch (rfc.mode) { |
3265 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3266 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3267 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3268 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3269 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3270 | chan->ack_win = min_t(u16, chan->ack_win, | |
3271 | rfc.txwin_size); | |
66af7aaf AE |
3272 | |
3273 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3274 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3275 | chan->local_sdu_itime = | |
2d792818 | 3276 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3277 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3278 | chan->local_flush_to = | |
2d792818 | 3279 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3280 | } |
f2fcfcd6 | 3281 | break; |
66af7aaf | 3282 | |
f2fcfcd6 | 3283 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3284 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3285 | } |
3286 | } | |
3287 | ||
fe4128e0 | 3288 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3289 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3290 | |
3291 | return ptr - data; | |
3292 | } | |
3293 | ||
2d792818 GP |
3294 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3295 | u16 result, u16 flags) | |
1da177e4 LT |
3296 | { |
3297 | struct l2cap_conf_rsp *rsp = data; | |
3298 | void *ptr = rsp->data; | |
1da177e4 | 3299 | |
fe4128e0 | 3300 | BT_DBG("chan %p", chan); |
1da177e4 | 3301 | |
fe4128e0 | 3302 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3303 | rsp->result = cpu_to_le16(result); |
aca3192c | 3304 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3305 | |
3306 | return ptr - data; | |
3307 | } | |
3308 | ||
8c1d787b | 3309 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3310 | { |
3311 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3312 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3313 | u8 buf[128]; |
3314 | ||
fe4128e0 GP |
3315 | rsp.scid = cpu_to_le16(chan->dcid); |
3316 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3317 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3318 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
2d792818 | 3319 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
710f9b0a | 3320 | |
c1360a1c | 3321 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3322 | return; |
3323 | ||
710f9b0a | 3324 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3325 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3326 | chan->num_conf_req++; |
3327 | } | |
3328 | ||
47d1ec61 | 3329 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3330 | { |
7b1c0049 GP |
3331 | int type, olen; |
3332 | unsigned long val; | |
c20f8e35 MM |
3333 | /* Use sane default values in case a misbehaving remote device |
3334 | * did not send an RFC or extended window size option. | |
3335 | */ | |
3336 | u16 txwin_ext = chan->ack_win; | |
3337 | struct l2cap_conf_rfc rfc = { | |
3338 | .mode = chan->mode, | |
3339 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3340 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3341 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3342 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3343 | }; | |
7b1c0049 | 3344 | |
47d1ec61 | 3345 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3346 | |
0c1bc5c6 | 3347 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3348 | return; |
3349 | ||
3350 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3351 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3352 | ||
c20f8e35 MM |
3353 | switch (type) { |
3354 | case L2CAP_CONF_RFC: | |
3355 | if (olen == sizeof(rfc)) | |
3356 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3357 | break; |
c20f8e35 MM |
3358 | case L2CAP_CONF_EWS: |
3359 | txwin_ext = val; | |
3360 | break; | |
3361 | } | |
7b1c0049 GP |
3362 | } |
3363 | ||
7b1c0049 GP |
3364 | switch (rfc.mode) { |
3365 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3366 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3367 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3368 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3369 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3370 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3371 | else | |
3372 | chan->ack_win = min_t(u16, chan->ack_win, | |
3373 | rfc.txwin_size); | |
7b1c0049 GP |
3374 | break; |
3375 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3376 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3377 | } |
3378 | } | |
3379 | ||
2d792818 GP |
3380 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
3381 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4e8402a3 | 3382 | { |
e2fd318e | 3383 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3384 | |
e2fd318e | 3385 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3386 | return 0; |
3387 | ||
3388 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3389 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3390 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3391 | |
3392 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3393 | conn->info_ident = 0; |
984947dc | 3394 | |
4e8402a3 MH |
3395 | l2cap_conn_start(conn); |
3396 | } | |
3397 | ||
3398 | return 0; | |
3399 | } | |
3400 | ||
4c89b6aa MM |
3401 | static void __l2cap_connect(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, |
3402 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3403 | { |
1da177e4 LT |
3404 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3405 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3406 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3407 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3408 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3409 | |
3410 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3411 | __le16 psm = req->psm; |
1da177e4 | 3412 | |
097db76c | 3413 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3414 | |
3415 | /* Check if we have socket listening on psm */ | |
c2287681 | 3416 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3417 | if (!pchan) { |
1da177e4 LT |
3418 | result = L2CAP_CR_BAD_PSM; |
3419 | goto sendresp; | |
3420 | } | |
3421 | ||
23691d75 GP |
3422 | parent = pchan->sk; |
3423 | ||
3df91ea2 | 3424 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3425 | lock_sock(parent); |
e0f0cb56 | 3426 | |
e7c29cb1 | 3427 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3428 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3429 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3430 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3431 | result = L2CAP_CR_SEC_BLOCK; |
3432 | goto response; | |
3433 | } | |
3434 | ||
1da177e4 LT |
3435 | result = L2CAP_CR_NO_MEM; |
3436 | ||
2dfa1003 GP |
3437 | /* Check if we already have channel with that dcid */ |
3438 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3439 | goto response; | |
3440 | ||
80b98027 | 3441 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3442 | if (!chan) |
1da177e4 LT |
3443 | goto response; |
3444 | ||
80808e43 GP |
3445 | sk = chan->sk; |
3446 | ||
1da177e4 LT |
3447 | hci_conn_hold(conn->hcon); |
3448 | ||
1da177e4 LT |
3449 | bacpy(&bt_sk(sk)->src, conn->src); |
3450 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3451 | chan->psm = psm; |
3452 | chan->dcid = scid; | |
1da177e4 | 3453 | |
d1010240 GP |
3454 | bt_accept_enqueue(parent, sk); |
3455 | ||
6be36555 | 3456 | __l2cap_chan_add(conn, chan); |
48454079 | 3457 | |
fe4128e0 | 3458 | dcid = chan->scid; |
1da177e4 | 3459 | |
c9b66675 | 3460 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3461 | |
fc7f8a7e | 3462 | chan->ident = cmd->ident; |
1da177e4 | 3463 | |
984947dc | 3464 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3465 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3466 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3467 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3468 | result = L2CAP_CR_PEND; |
3469 | status = L2CAP_CS_AUTHOR_PEND; | |
3470 | parent->sk_data_ready(parent, 0); | |
3471 | } else { | |
0e587be7 | 3472 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3473 | result = L2CAP_CR_SUCCESS; |
3474 | status = L2CAP_CS_NO_INFO; | |
3475 | } | |
79d554a6 | 3476 | } else { |
0e587be7 | 3477 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3478 | result = L2CAP_CR_PEND; |
3479 | status = L2CAP_CS_AUTHEN_PEND; | |
3480 | } | |
3481 | } else { | |
0e587be7 | 3482 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3483 | result = L2CAP_CR_PEND; |
3484 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3485 | } |
3486 | ||
1da177e4 | 3487 | response: |
aa2ac881 | 3488 | release_sock(parent); |
3df91ea2 | 3489 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3490 | |
3491 | sendresp: | |
aca3192c YH |
3492 | rsp.scid = cpu_to_le16(scid); |
3493 | rsp.dcid = cpu_to_le16(dcid); | |
3494 | rsp.result = cpu_to_le16(result); | |
3495 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3496 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3497 | |
3498 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3499 | struct l2cap_info_req info; | |
ac73498c | 3500 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3501 | |
3502 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3503 | conn->info_ident = l2cap_get_ident(conn); | |
3504 | ||
ba13ccd9 | 3505 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3506 | |
2d792818 GP |
3507 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3508 | sizeof(info), &info); | |
79d554a6 MH |
3509 | } |
3510 | ||
c1360a1c | 3511 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3512 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3513 | u8 buf[128]; |
c1360a1c | 3514 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3515 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3516 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3517 | chan->num_conf_req++; |
e9aeb2dd | 3518 | } |
4c89b6aa | 3519 | } |
e9aeb2dd | 3520 | |
4c89b6aa MM |
3521 | static int l2cap_connect_req(struct l2cap_conn *conn, |
3522 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3523 | { | |
3524 | __l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); | |
1da177e4 LT |
3525 | return 0; |
3526 | } | |
3527 | ||
2d792818 GP |
3528 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, |
3529 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3530 | { |
3531 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3532 | u16 scid, dcid, result, status; | |
48454079 | 3533 | struct l2cap_chan *chan; |
1da177e4 | 3534 | u8 req[128]; |
3df91ea2 | 3535 | int err; |
1da177e4 LT |
3536 | |
3537 | scid = __le16_to_cpu(rsp->scid); | |
3538 | dcid = __le16_to_cpu(rsp->dcid); | |
3539 | result = __le16_to_cpu(rsp->result); | |
3540 | status = __le16_to_cpu(rsp->status); | |
3541 | ||
1b009c98 | 3542 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3543 | dcid, scid, result, status); |
1da177e4 | 3544 | |
3df91ea2 AE |
3545 | mutex_lock(&conn->chan_lock); |
3546 | ||
1da177e4 | 3547 | if (scid) { |
3df91ea2 AE |
3548 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3549 | if (!chan) { | |
3550 | err = -EFAULT; | |
3551 | goto unlock; | |
3552 | } | |
1da177e4 | 3553 | } else { |
3df91ea2 AE |
3554 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3555 | if (!chan) { | |
3556 | err = -EFAULT; | |
3557 | goto unlock; | |
3558 | } | |
1da177e4 LT |
3559 | } |
3560 | ||
3df91ea2 AE |
3561 | err = 0; |
3562 | ||
6be36555 | 3563 | l2cap_chan_lock(chan); |
48454079 | 3564 | |
1da177e4 LT |
3565 | switch (result) { |
3566 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3567 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3568 | chan->ident = 0; |
fe4128e0 | 3569 | chan->dcid = dcid; |
c1360a1c | 3570 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3571 | |
c1360a1c | 3572 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3573 | break; |
3574 | ||
1da177e4 | 3575 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3576 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3577 | chan->num_conf_req++; |
1da177e4 LT |
3578 | break; |
3579 | ||
3580 | case L2CAP_CR_PEND: | |
c1360a1c | 3581 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3582 | break; |
3583 | ||
3584 | default: | |
48454079 | 3585 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3586 | break; |
3587 | } | |
3588 | ||
6be36555 | 3589 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3590 | |
3591 | unlock: | |
3592 | mutex_unlock(&conn->chan_lock); | |
3593 | ||
3594 | return err; | |
1da177e4 LT |
3595 | } |
3596 | ||
47d1ec61 | 3597 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3598 | { |
3599 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3600 | * sides request it. | |
3601 | */ | |
0c1bc5c6 | 3602 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3603 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3604 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3605 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3606 | } |
3607 | ||
29d8a590 AE |
3608 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3609 | u8 ident, u16 flags) | |
3610 | { | |
3611 | struct l2cap_conn *conn = chan->conn; | |
3612 | ||
3613 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3614 | flags); | |
3615 | ||
3616 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3617 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3618 | ||
3619 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3620 | l2cap_build_conf_rsp(chan, data, | |
3621 | L2CAP_CONF_SUCCESS, flags), data); | |
3622 | } | |
3623 | ||
2d792818 GP |
3624 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3625 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3626 | u8 *data) | |
1da177e4 LT |
3627 | { |
3628 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3629 | u16 dcid, flags; | |
3630 | u8 rsp[64]; | |
48454079 | 3631 | struct l2cap_chan *chan; |
3c588192 | 3632 | int len, err = 0; |
1da177e4 LT |
3633 | |
3634 | dcid = __le16_to_cpu(req->dcid); | |
3635 | flags = __le16_to_cpu(req->flags); | |
3636 | ||
3637 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3638 | ||
baa7e1fa | 3639 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3640 | if (!chan) |
1da177e4 LT |
3641 | return -ENOENT; |
3642 | ||
033b1142 | 3643 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3644 | struct l2cap_cmd_rej_cid rej; |
3645 | ||
ac73498c | 3646 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3647 | rej.scid = cpu_to_le16(chan->scid); |
3648 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3649 | |
df6bd743 | 3650 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2d792818 | 3651 | sizeof(rej), &rej); |
354f60a9 | 3652 | goto unlock; |
df6bd743 | 3653 | } |
354f60a9 | 3654 | |
5dee9e7c | 3655 | /* Reject if config buffer is too small. */ |
88219a0f | 3656 | len = cmd_len - sizeof(*req); |
7ac28817 | 3657 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3658 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
3659 | l2cap_build_conf_rsp(chan, rsp, |
3660 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
3661 | goto unlock; |
3662 | } | |
3663 | ||
3664 | /* Store config. */ | |
73ffa904 GP |
3665 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3666 | chan->conf_len += len; | |
1da177e4 | 3667 | |
59e54bd1 | 3668 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3669 | /* Incomplete config. Send empty response. */ |
3670 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
3671 | l2cap_build_conf_rsp(chan, rsp, |
3672 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
3673 | goto unlock; |
3674 | } | |
3675 | ||
3676 | /* Complete config. */ | |
73ffa904 | 3677 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3678 | if (len < 0) { |
e92c8e70 | 3679 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3680 | goto unlock; |
f2fcfcd6 | 3681 | } |
1da177e4 | 3682 | |
5dee9e7c | 3683 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3684 | chan->num_conf_rsp++; |
5dee9e7c | 3685 | |
5dee9e7c | 3686 | /* Reset config buffer. */ |
73ffa904 | 3687 | chan->conf_len = 0; |
5dee9e7c | 3688 | |
c1360a1c | 3689 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3690 | goto unlock; |
3691 | ||
c1360a1c | 3692 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3693 | set_default_fcs(chan); |
fcc203c3 | 3694 | |
105bdf9e MM |
3695 | if (chan->mode == L2CAP_MODE_ERTM || |
3696 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3697 | err = l2cap_ertm_init(chan); |
3698 | ||
3699 | if (err < 0) | |
3700 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3701 | else | |
3702 | l2cap_chan_ready(chan); | |
0565c1c2 | 3703 | |
876d9484 MH |
3704 | goto unlock; |
3705 | } | |
3706 | ||
c1360a1c | 3707 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3708 | u8 buf[64]; |
1da177e4 | 3709 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3710 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3711 | chan->num_conf_req++; |
1da177e4 LT |
3712 | } |
3713 | ||
0e8b207e AE |
3714 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3715 | Conf Rsp PENDING in the code above */ | |
3716 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 3717 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
3718 | |
3719 | /* check compatibility */ | |
3720 | ||
29d8a590 | 3721 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
0e8b207e AE |
3722 | } |
3723 | ||
1da177e4 | 3724 | unlock: |
6be36555 | 3725 | l2cap_chan_unlock(chan); |
3c588192 | 3726 | return err; |
1da177e4 LT |
3727 | } |
3728 | ||
2d792818 GP |
3729 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
3730 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3731 | { |
3732 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3733 | u16 scid, flags, result; | |
48454079 | 3734 | struct l2cap_chan *chan; |
61386cba | 3735 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3736 | int err = 0; |
1da177e4 LT |
3737 | |
3738 | scid = __le16_to_cpu(rsp->scid); | |
3739 | flags = __le16_to_cpu(rsp->flags); | |
3740 | result = __le16_to_cpu(rsp->result); | |
3741 | ||
61386cba AE |
3742 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3743 | result, len); | |
1da177e4 | 3744 | |
baa7e1fa | 3745 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3746 | if (!chan) |
1da177e4 LT |
3747 | return 0; |
3748 | ||
3749 | switch (result) { | |
3750 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3751 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3752 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3753 | break; |
3754 | ||
0e8b207e AE |
3755 | case L2CAP_CONF_PENDING: |
3756 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3757 | ||
3758 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3759 | char buf[64]; | |
3760 | ||
3761 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 3762 | buf, &result); |
0e8b207e AE |
3763 | if (len < 0) { |
3764 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3765 | goto done; | |
3766 | } | |
3767 | ||
3768 | /* check compatibility */ | |
3769 | ||
29d8a590 | 3770 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 0); |
0e8b207e AE |
3771 | } |
3772 | goto done; | |
3773 | ||
1da177e4 | 3774 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3775 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3776 | char req[64]; |
3777 | ||
c2c77ec8 | 3778 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3779 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3780 | goto done; |
3781 | } | |
3782 | ||
f2fcfcd6 GP |
3783 | /* throw out any old stored conf requests */ |
3784 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 3785 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 3786 | req, &result); |
f2fcfcd6 | 3787 | if (len < 0) { |
e92c8e70 | 3788 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3789 | goto done; |
3790 | } | |
3791 | ||
3792 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 3793 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 3794 | chan->num_conf_req++; |
f2fcfcd6 GP |
3795 | if (result != L2CAP_CONF_SUCCESS) |
3796 | goto done; | |
3797 | break; | |
1da177e4 LT |
3798 | } |
3799 | ||
8e87d142 | 3800 | default: |
6be36555 | 3801 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3802 | |
ba13ccd9 | 3803 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3804 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3805 | goto done; |
3806 | } | |
3807 | ||
59e54bd1 | 3808 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3809 | goto done; |
3810 | ||
c1360a1c | 3811 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3812 | |
c1360a1c | 3813 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3814 | set_default_fcs(chan); |
fcc203c3 | 3815 | |
105bdf9e MM |
3816 | if (chan->mode == L2CAP_MODE_ERTM || |
3817 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3818 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3819 | |
3c588192 MM |
3820 | if (err < 0) |
3821 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3822 | else | |
3823 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3824 | } |
3825 | ||
3826 | done: | |
6be36555 | 3827 | l2cap_chan_unlock(chan); |
3c588192 | 3828 | return err; |
1da177e4 LT |
3829 | } |
3830 | ||
2d792818 GP |
3831 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
3832 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3833 | { |
3834 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3835 | struct l2cap_disconn_rsp rsp; | |
3836 | u16 dcid, scid; | |
48454079 | 3837 | struct l2cap_chan *chan; |
1da177e4 LT |
3838 | struct sock *sk; |
3839 | ||
3840 | scid = __le16_to_cpu(req->scid); | |
3841 | dcid = __le16_to_cpu(req->dcid); | |
3842 | ||
3843 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3844 | ||
3df91ea2 AE |
3845 | mutex_lock(&conn->chan_lock); |
3846 | ||
3847 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3848 | if (!chan) { | |
3849 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3850 | return 0; |
3df91ea2 | 3851 | } |
1da177e4 | 3852 | |
6be36555 AE |
3853 | l2cap_chan_lock(chan); |
3854 | ||
48454079 GP |
3855 | sk = chan->sk; |
3856 | ||
fe4128e0 GP |
3857 | rsp.dcid = cpu_to_le16(chan->scid); |
3858 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3859 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3860 | ||
6be36555 | 3861 | lock_sock(sk); |
1da177e4 | 3862 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3863 | release_sock(sk); |
1da177e4 | 3864 | |
61d6ef3e | 3865 | l2cap_chan_hold(chan); |
48454079 | 3866 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3867 | |
3868 | l2cap_chan_unlock(chan); | |
1da177e4 | 3869 | |
80b98027 | 3870 | chan->ops->close(chan); |
61d6ef3e | 3871 | l2cap_chan_put(chan); |
3df91ea2 AE |
3872 | |
3873 | mutex_unlock(&conn->chan_lock); | |
3874 | ||
1da177e4 LT |
3875 | return 0; |
3876 | } | |
3877 | ||
2d792818 GP |
3878 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
3879 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3880 | { |
3881 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3882 | u16 dcid, scid; | |
48454079 | 3883 | struct l2cap_chan *chan; |
1da177e4 LT |
3884 | |
3885 | scid = __le16_to_cpu(rsp->scid); | |
3886 | dcid = __le16_to_cpu(rsp->dcid); | |
3887 | ||
3888 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3889 | ||
3df91ea2 AE |
3890 | mutex_lock(&conn->chan_lock); |
3891 | ||
3892 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3893 | if (!chan) { | |
3894 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3895 | return 0; |
3df91ea2 | 3896 | } |
1da177e4 | 3897 | |
6be36555 | 3898 | l2cap_chan_lock(chan); |
48454079 | 3899 | |
61d6ef3e | 3900 | l2cap_chan_hold(chan); |
48454079 | 3901 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3902 | |
3903 | l2cap_chan_unlock(chan); | |
1da177e4 | 3904 | |
80b98027 | 3905 | chan->ops->close(chan); |
61d6ef3e | 3906 | l2cap_chan_put(chan); |
3df91ea2 AE |
3907 | |
3908 | mutex_unlock(&conn->chan_lock); | |
3909 | ||
1da177e4 LT |
3910 | return 0; |
3911 | } | |
3912 | ||
2d792818 GP |
3913 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
3914 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3915 | { |
3916 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3917 | u16 type; |
3918 | ||
3919 | type = __le16_to_cpu(req->type); | |
3920 | ||
3921 | BT_DBG("type 0x%4.4x", type); | |
3922 | ||
f0709e03 MH |
3923 | if (type == L2CAP_IT_FEAT_MASK) { |
3924 | u8 buf[8]; | |
44dd46de | 3925 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3926 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3927 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3928 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3929 | if (!disable_ertm) |
fcc203c3 | 3930 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 3931 | | L2CAP_FEAT_FCS; |
a5fd6f30 | 3932 | if (enable_hs) |
6327eb98 | 3933 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 3934 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 3935 | |
1b7bf4ed | 3936 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
3937 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3938 | buf); | |
e1027a7c MH |
3939 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3940 | u8 buf[12]; | |
3941 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3942 | |
3943 | if (enable_hs) | |
3944 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3945 | else | |
3946 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3947 | ||
ac73498c AE |
3948 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3949 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3950 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
3951 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3952 | buf); | |
f0709e03 MH |
3953 | } else { |
3954 | struct l2cap_info_rsp rsp; | |
3955 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3956 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
3957 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
3958 | &rsp); | |
f0709e03 | 3959 | } |
1da177e4 LT |
3960 | |
3961 | return 0; | |
3962 | } | |
3963 | ||
2d792818 GP |
3964 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
3965 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3966 | { |
3967 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3968 | u16 type, result; | |
3969 | ||
3970 | type = __le16_to_cpu(rsp->type); | |
3971 | result = __le16_to_cpu(rsp->result); | |
3972 | ||
3973 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3974 | ||
e90165be AE |
3975 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3976 | if (cmd->ident != conn->info_ident || | |
2d792818 | 3977 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
3978 | return 0; |
3979 | ||
17cd3f37 | 3980 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3981 | |
adb08ede VT |
3982 | if (result != L2CAP_IR_SUCCESS) { |
3983 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3984 | conn->info_ident = 0; | |
3985 | ||
3986 | l2cap_conn_start(conn); | |
3987 | ||
3988 | return 0; | |
3989 | } | |
3990 | ||
978c93b9 AE |
3991 | switch (type) { |
3992 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3993 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3994 | |
47ec1dcd | 3995 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3996 | struct l2cap_info_req req; |
ac73498c | 3997 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3998 | |
3999 | conn->info_ident = l2cap_get_ident(conn); | |
4000 | ||
4001 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4002 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4003 | } else { |
4004 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4005 | conn->info_ident = 0; | |
4006 | ||
4007 | l2cap_conn_start(conn); | |
4008 | } | |
978c93b9 AE |
4009 | break; |
4010 | ||
4011 | case L2CAP_IT_FIXED_CHAN: | |
4012 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4013 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4014 | conn->info_ident = 0; |
984947dc MH |
4015 | |
4016 | l2cap_conn_start(conn); | |
978c93b9 | 4017 | break; |
984947dc | 4018 | } |
4e8402a3 | 4019 | |
1da177e4 LT |
4020 | return 0; |
4021 | } | |
4022 | ||
f94ff6ff | 4023 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
2d792818 GP |
4024 | struct l2cap_cmd_hdr *cmd, |
4025 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4026 | { |
4027 | struct l2cap_create_chan_req *req = data; | |
4028 | struct l2cap_create_chan_rsp rsp; | |
4029 | u16 psm, scid; | |
4030 | ||
4031 | if (cmd_len != sizeof(*req)) | |
4032 | return -EPROTO; | |
4033 | ||
4034 | if (!enable_hs) | |
4035 | return -EINVAL; | |
4036 | ||
4037 | psm = le16_to_cpu(req->psm); | |
4038 | scid = le16_to_cpu(req->scid); | |
4039 | ||
ad0ac6ca | 4040 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff MM |
4041 | |
4042 | /* Placeholder: Always reject */ | |
4043 | rsp.dcid = 0; | |
4044 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
4045 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4046 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
4047 | |
4048 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4049 | sizeof(rsp), &rsp); | |
4050 | ||
4051 | return 0; | |
4052 | } | |
4053 | ||
2d792818 GP |
4054 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, |
4055 | struct l2cap_cmd_hdr *cmd, | |
4056 | void *data) | |
4057 | { | |
4058 | BT_DBG("conn %p", conn); | |
4059 | ||
4060 | return l2cap_connect_rsp(conn, cmd, data); | |
4061 | } | |
4062 | ||
8d5a04a1 | 4063 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 4064 | u16 icid, u16 result) |
8d5a04a1 MM |
4065 | { |
4066 | struct l2cap_move_chan_rsp rsp; | |
4067 | ||
ad0ac6ca | 4068 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4069 | |
4070 | rsp.icid = cpu_to_le16(icid); | |
4071 | rsp.result = cpu_to_le16(result); | |
4072 | ||
4073 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4074 | } | |
4075 | ||
4076 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4077 | struct l2cap_chan *chan, |
4078 | u16 icid, u16 result) | |
8d5a04a1 MM |
4079 | { |
4080 | struct l2cap_move_chan_cfm cfm; | |
4081 | u8 ident; | |
4082 | ||
ad0ac6ca | 4083 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4084 | |
4085 | ident = l2cap_get_ident(conn); | |
4086 | if (chan) | |
4087 | chan->ident = ident; | |
4088 | ||
4089 | cfm.icid = cpu_to_le16(icid); | |
4090 | cfm.result = cpu_to_le16(result); | |
4091 | ||
4092 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4093 | } | |
4094 | ||
4095 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4096 | u16 icid) |
8d5a04a1 MM |
4097 | { |
4098 | struct l2cap_move_chan_cfm_rsp rsp; | |
4099 | ||
ad0ac6ca | 4100 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4101 | |
4102 | rsp.icid = cpu_to_le16(icid); | |
4103 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4104 | } | |
4105 | ||
4106 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4107 | struct l2cap_cmd_hdr *cmd, |
4108 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4109 | { |
4110 | struct l2cap_move_chan_req *req = data; | |
4111 | u16 icid = 0; | |
4112 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4113 | ||
4114 | if (cmd_len != sizeof(*req)) | |
4115 | return -EPROTO; | |
4116 | ||
4117 | icid = le16_to_cpu(req->icid); | |
4118 | ||
ad0ac6ca | 4119 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4120 | |
4121 | if (!enable_hs) | |
4122 | return -EINVAL; | |
4123 | ||
4124 | /* Placeholder: Always refuse */ | |
4125 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4126 | ||
4127 | return 0; | |
4128 | } | |
4129 | ||
4130 | static inline int l2cap_move_channel_rsp(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_rsp *rsp = data; | |
4135 | u16 icid, result; | |
4136 | ||
4137 | if (cmd_len != sizeof(*rsp)) | |
4138 | return -EPROTO; | |
4139 | ||
4140 | icid = le16_to_cpu(rsp->icid); | |
4141 | result = le16_to_cpu(rsp->result); | |
4142 | ||
ad0ac6ca | 4143 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4144 | |
4145 | /* Placeholder: Always unconfirmed */ | |
4146 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4147 | ||
4148 | return 0; | |
4149 | } | |
4150 | ||
4151 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4152 | struct l2cap_cmd_hdr *cmd, |
4153 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4154 | { |
4155 | struct l2cap_move_chan_cfm *cfm = data; | |
4156 | u16 icid, result; | |
4157 | ||
4158 | if (cmd_len != sizeof(*cfm)) | |
4159 | return -EPROTO; | |
4160 | ||
4161 | icid = le16_to_cpu(cfm->icid); | |
4162 | result = le16_to_cpu(cfm->result); | |
4163 | ||
ad0ac6ca | 4164 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4165 | |
4166 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4167 | ||
4168 | return 0; | |
4169 | } | |
4170 | ||
4171 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4172 | struct l2cap_cmd_hdr *cmd, |
4173 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4174 | { |
4175 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4176 | u16 icid; | |
4177 | ||
4178 | if (cmd_len != sizeof(*rsp)) | |
4179 | return -EPROTO; | |
4180 | ||
4181 | icid = le16_to_cpu(rsp->icid); | |
4182 | ||
ad0ac6ca | 4183 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4184 | |
4185 | return 0; | |
4186 | } | |
4187 | ||
e2174ca4 | 4188 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 4189 | u16 to_multiplier) |
de73115a CT |
4190 | { |
4191 | u16 max_latency; | |
4192 | ||
4193 | if (min > max || min < 6 || max > 3200) | |
4194 | return -EINVAL; | |
4195 | ||
4196 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4197 | return -EINVAL; | |
4198 | ||
4199 | if (max >= to_multiplier * 8) | |
4200 | return -EINVAL; | |
4201 | ||
4202 | max_latency = (to_multiplier * 8 / max) - 1; | |
4203 | if (latency > 499 || latency > max_latency) | |
4204 | return -EINVAL; | |
4205 | ||
4206 | return 0; | |
4207 | } | |
4208 | ||
4209 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
4210 | struct l2cap_cmd_hdr *cmd, |
4211 | u8 *data) | |
de73115a CT |
4212 | { |
4213 | struct hci_conn *hcon = conn->hcon; | |
4214 | struct l2cap_conn_param_update_req *req; | |
4215 | struct l2cap_conn_param_update_rsp rsp; | |
4216 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4217 | int err; |
de73115a CT |
4218 | |
4219 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4220 | return -EINVAL; | |
4221 | ||
4222 | cmd_len = __le16_to_cpu(cmd->len); | |
4223 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4224 | return -EPROTO; | |
4225 | ||
4226 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4227 | min = __le16_to_cpu(req->min); |
4228 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4229 | latency = __le16_to_cpu(req->latency); |
4230 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4231 | ||
4232 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 4233 | min, max, latency, to_multiplier); |
de73115a CT |
4234 | |
4235 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4236 | |
4237 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4238 | if (err) | |
ac73498c | 4239 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4240 | else |
ac73498c | 4241 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4242 | |
4243 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 4244 | sizeof(rsp), &rsp); |
de73115a | 4245 | |
2ce603eb CT |
4246 | if (!err) |
4247 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4248 | ||
de73115a CT |
4249 | return 0; |
4250 | } | |
4251 | ||
3300d9a9 | 4252 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
4253 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4254 | u8 *data) | |
3300d9a9 CT |
4255 | { |
4256 | int err = 0; | |
4257 | ||
4258 | switch (cmd->code) { | |
4259 | case L2CAP_COMMAND_REJ: | |
4260 | l2cap_command_rej(conn, cmd, data); | |
4261 | break; | |
4262 | ||
4263 | case L2CAP_CONN_REQ: | |
4264 | err = l2cap_connect_req(conn, cmd, data); | |
4265 | break; | |
4266 | ||
4267 | case L2CAP_CONN_RSP: | |
f5a2598d | 4268 | case L2CAP_CREATE_CHAN_RSP: |
3300d9a9 CT |
4269 | err = l2cap_connect_rsp(conn, cmd, data); |
4270 | break; | |
4271 | ||
4272 | case L2CAP_CONF_REQ: | |
4273 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4274 | break; | |
4275 | ||
4276 | case L2CAP_CONF_RSP: | |
4277 | err = l2cap_config_rsp(conn, cmd, data); | |
4278 | break; | |
4279 | ||
4280 | case L2CAP_DISCONN_REQ: | |
4281 | err = l2cap_disconnect_req(conn, cmd, data); | |
4282 | break; | |
4283 | ||
4284 | case L2CAP_DISCONN_RSP: | |
4285 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4286 | break; | |
4287 | ||
4288 | case L2CAP_ECHO_REQ: | |
4289 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4290 | break; | |
4291 | ||
4292 | case L2CAP_ECHO_RSP: | |
4293 | break; | |
4294 | ||
4295 | case L2CAP_INFO_REQ: | |
4296 | err = l2cap_information_req(conn, cmd, data); | |
4297 | break; | |
4298 | ||
4299 | case L2CAP_INFO_RSP: | |
4300 | err = l2cap_information_rsp(conn, cmd, data); | |
4301 | break; | |
4302 | ||
f94ff6ff MM |
4303 | case L2CAP_CREATE_CHAN_REQ: |
4304 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4305 | break; | |
4306 | ||
8d5a04a1 MM |
4307 | case L2CAP_MOVE_CHAN_REQ: |
4308 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4309 | break; | |
4310 | ||
4311 | case L2CAP_MOVE_CHAN_RSP: | |
4312 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4313 | break; | |
4314 | ||
4315 | case L2CAP_MOVE_CHAN_CFM: | |
4316 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4317 | break; | |
4318 | ||
4319 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4320 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4321 | break; | |
4322 | ||
3300d9a9 CT |
4323 | default: |
4324 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4325 | err = -EINVAL; | |
4326 | break; | |
4327 | } | |
4328 | ||
4329 | return err; | |
4330 | } | |
4331 | ||
4332 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 4333 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
4334 | { |
4335 | switch (cmd->code) { | |
4336 | case L2CAP_COMMAND_REJ: | |
4337 | return 0; | |
4338 | ||
4339 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4340 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4341 | |
4342 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4343 | return 0; | |
4344 | ||
4345 | default: | |
4346 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4347 | return -EINVAL; | |
4348 | } | |
4349 | } | |
4350 | ||
4351 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2d792818 | 4352 | struct sk_buff *skb) |
1da177e4 LT |
4353 | { |
4354 | u8 *data = skb->data; | |
4355 | int len = skb->len; | |
4356 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4357 | int err; |
1da177e4 LT |
4358 | |
4359 | l2cap_raw_recv(conn, skb); | |
4360 | ||
4361 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4362 | u16 cmd_len; |
1da177e4 LT |
4363 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4364 | data += L2CAP_CMD_HDR_SIZE; | |
4365 | len -= L2CAP_CMD_HDR_SIZE; | |
4366 | ||
88219a0f | 4367 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4368 | |
2d792818 GP |
4369 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
4370 | cmd.ident); | |
1da177e4 | 4371 | |
88219a0f | 4372 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4373 | BT_DBG("corrupted command"); |
4374 | break; | |
4375 | } | |
4376 | ||
3300d9a9 CT |
4377 | if (conn->hcon->type == LE_LINK) |
4378 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4379 | else | |
4380 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4381 | |
4382 | if (err) { | |
e2fd318e | 4383 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4384 | |
4385 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4386 | |
4387 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4388 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
4389 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
4390 | sizeof(rej), &rej); | |
1da177e4 LT |
4391 | } |
4392 | ||
88219a0f AV |
4393 | data += cmd_len; |
4394 | len -= cmd_len; | |
1da177e4 LT |
4395 | } |
4396 | ||
4397 | kfree_skb(skb); | |
4398 | } | |
4399 | ||
47d1ec61 | 4400 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4401 | { |
4402 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4403 | int hdr_size; |
4404 | ||
4405 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4406 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4407 | else | |
4408 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4409 | |
47d1ec61 | 4410 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4411 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4412 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4413 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4414 | ||
4415 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4416 | return -EBADMSG; |
fcc203c3 GP |
4417 | } |
4418 | return 0; | |
4419 | } | |
4420 | ||
6ea00485 | 4421 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4422 | { |
e31f7633 | 4423 | struct l2cap_ctrl control; |
d5392c8f | 4424 | |
e31f7633 | 4425 | BT_DBG("chan %p", chan); |
d5392c8f | 4426 | |
e31f7633 MM |
4427 | memset(&control, 0, sizeof(control)); |
4428 | control.sframe = 1; | |
4429 | control.final = 1; | |
4430 | control.reqseq = chan->buffer_seq; | |
4431 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4432 | |
e2ab4353 | 4433 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4434 | control.super = L2CAP_SUPER_RNR; |
4435 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4436 | } |
4437 | ||
e31f7633 MM |
4438 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4439 | chan->unacked_frames > 0) | |
4440 | __set_retrans_timer(chan); | |
d5392c8f | 4441 | |
e31f7633 | 4442 | /* Send pending iframes */ |
525cd185 | 4443 | l2cap_ertm_send(chan); |
d5392c8f | 4444 | |
e2ab4353 | 4445 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4446 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4447 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4448 | * send it now. | |
4449 | */ | |
4450 | control.super = L2CAP_SUPER_RR; | |
4451 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4452 | } |
4453 | } | |
4454 | ||
2d792818 GP |
4455 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
4456 | struct sk_buff **last_frag) | |
18778a63 | 4457 | { |
84084a31 MM |
4458 | /* skb->len reflects data in skb as well as all fragments |
4459 | * skb->data_len reflects only data in fragments | |
4460 | */ | |
4461 | if (!skb_has_frag_list(skb)) | |
4462 | skb_shinfo(skb)->frag_list = new_frag; | |
4463 | ||
4464 | new_frag->next = NULL; | |
4465 | ||
4466 | (*last_frag)->next = new_frag; | |
4467 | *last_frag = new_frag; | |
4468 | ||
4469 | skb->len += new_frag->len; | |
4470 | skb->data_len += new_frag->len; | |
4471 | skb->truesize += new_frag->truesize; | |
4472 | } | |
4473 | ||
4b51dae9 MM |
4474 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4475 | struct l2cap_ctrl *control) | |
84084a31 MM |
4476 | { |
4477 | int err = -EINVAL; | |
18778a63 | 4478 | |
4b51dae9 | 4479 | switch (control->sar) { |
7e0ef6ee | 4480 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4481 | if (chan->sdu) |
4482 | break; | |
18778a63 | 4483 | |
80b98027 | 4484 | err = chan->ops->recv(chan, skb); |
84084a31 | 4485 | break; |
18778a63 | 4486 | |
7e0ef6ee | 4487 | case L2CAP_SAR_START: |
84084a31 MM |
4488 | if (chan->sdu) |
4489 | break; | |
18778a63 | 4490 | |
6f61fd47 | 4491 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4492 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4493 | |
84084a31 MM |
4494 | if (chan->sdu_len > chan->imtu) { |
4495 | err = -EMSGSIZE; | |
4496 | break; | |
4497 | } | |
1890d36b | 4498 | |
84084a31 MM |
4499 | if (skb->len >= chan->sdu_len) |
4500 | break; | |
18778a63 | 4501 | |
84084a31 MM |
4502 | chan->sdu = skb; |
4503 | chan->sdu_last_frag = skb; | |
18778a63 | 4504 | |
84084a31 MM |
4505 | skb = NULL; |
4506 | err = 0; | |
18778a63 GP |
4507 | break; |
4508 | ||
7e0ef6ee | 4509 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4510 | if (!chan->sdu) |
84084a31 | 4511 | break; |
18778a63 | 4512 | |
84084a31 MM |
4513 | append_skb_frag(chan->sdu, skb, |
4514 | &chan->sdu_last_frag); | |
4515 | skb = NULL; | |
18778a63 | 4516 | |
84084a31 MM |
4517 | if (chan->sdu->len >= chan->sdu_len) |
4518 | break; | |
4178ba46 | 4519 | |
84084a31 | 4520 | err = 0; |
18778a63 GP |
4521 | break; |
4522 | ||
7e0ef6ee | 4523 | case L2CAP_SAR_END: |
6f61fd47 | 4524 | if (!chan->sdu) |
84084a31 | 4525 | break; |
18778a63 | 4526 | |
84084a31 MM |
4527 | append_skb_frag(chan->sdu, skb, |
4528 | &chan->sdu_last_frag); | |
4529 | skb = NULL; | |
4178ba46 | 4530 | |
84084a31 MM |
4531 | if (chan->sdu->len != chan->sdu_len) |
4532 | break; | |
18778a63 | 4533 | |
80b98027 | 4534 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4535 | |
84084a31 MM |
4536 | if (!err) { |
4537 | /* Reassembly complete */ | |
4538 | chan->sdu = NULL; | |
4539 | chan->sdu_last_frag = NULL; | |
4540 | chan->sdu_len = 0; | |
1890d36b | 4541 | } |
18778a63 GP |
4542 | break; |
4543 | } | |
4544 | ||
84084a31 MM |
4545 | if (err) { |
4546 | kfree_skb(skb); | |
4547 | kfree_skb(chan->sdu); | |
4548 | chan->sdu = NULL; | |
4549 | chan->sdu_last_frag = NULL; | |
4550 | chan->sdu_len = 0; | |
4551 | } | |
18778a63 | 4552 | |
84084a31 | 4553 | return err; |
18778a63 GP |
4554 | } |
4555 | ||
61aa4f5b | 4556 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4557 | { |
61aa4f5b | 4558 | u8 event; |
712132eb | 4559 | |
61aa4f5b MM |
4560 | if (chan->mode != L2CAP_MODE_ERTM) |
4561 | return; | |
712132eb | 4562 | |
61aa4f5b | 4563 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4564 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4565 | } |
4566 | ||
d2a7ac5d MM |
4567 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4568 | { | |
63838725 MM |
4569 | int err = 0; |
4570 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4571 | * until a gap is encountered. | |
4572 | */ | |
4573 | ||
4574 | BT_DBG("chan %p", chan); | |
4575 | ||
4576 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4577 | struct sk_buff *skb; | |
4578 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4579 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4580 | ||
4581 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4582 | ||
4583 | if (!skb) | |
4584 | break; | |
4585 | ||
4586 | skb_unlink(skb, &chan->srej_q); | |
4587 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4588 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4589 | if (err) | |
4590 | break; | |
4591 | } | |
4592 | ||
4593 | if (skb_queue_empty(&chan->srej_q)) { | |
4594 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4595 | l2cap_send_ack(chan); | |
4596 | } | |
4597 | ||
4598 | return err; | |
d2a7ac5d MM |
4599 | } |
4600 | ||
4601 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4602 | struct l2cap_ctrl *control) | |
4603 | { | |
f80842a8 MM |
4604 | struct sk_buff *skb; |
4605 | ||
4606 | BT_DBG("chan %p, control %p", chan, control); | |
4607 | ||
4608 | if (control->reqseq == chan->next_tx_seq) { | |
4609 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4610 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4611 | return; | |
4612 | } | |
4613 | ||
4614 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4615 | ||
4616 | if (skb == NULL) { | |
4617 | BT_DBG("Seq %d not available for retransmission", | |
4618 | control->reqseq); | |
4619 | return; | |
4620 | } | |
4621 | ||
4622 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4623 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4624 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4625 | return; | |
4626 | } | |
4627 | ||
4628 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4629 | ||
4630 | if (control->poll) { | |
4631 | l2cap_pass_to_tx(chan, control); | |
4632 | ||
4633 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4634 | l2cap_retransmit(chan, control); | |
4635 | l2cap_ertm_send(chan); | |
4636 | ||
4637 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4638 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4639 | chan->srej_save_reqseq = control->reqseq; | |
4640 | } | |
4641 | } else { | |
4642 | l2cap_pass_to_tx_fbit(chan, control); | |
4643 | ||
4644 | if (control->final) { | |
4645 | if (chan->srej_save_reqseq != control->reqseq || | |
4646 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4647 | &chan->conn_state)) | |
4648 | l2cap_retransmit(chan, control); | |
4649 | } else { | |
4650 | l2cap_retransmit(chan, control); | |
4651 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4652 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4653 | chan->srej_save_reqseq = control->reqseq; | |
4654 | } | |
4655 | } | |
4656 | } | |
d2a7ac5d MM |
4657 | } |
4658 | ||
4659 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4660 | struct l2cap_ctrl *control) | |
4661 | { | |
fcd289df MM |
4662 | struct sk_buff *skb; |
4663 | ||
4664 | BT_DBG("chan %p, control %p", chan, control); | |
4665 | ||
4666 | if (control->reqseq == chan->next_tx_seq) { | |
4667 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4668 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4669 | return; | |
4670 | } | |
4671 | ||
4672 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4673 | ||
4674 | if (chan->max_tx && skb && | |
4675 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4676 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4677 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4678 | return; | |
4679 | } | |
4680 | ||
4681 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4682 | ||
4683 | l2cap_pass_to_tx(chan, control); | |
4684 | ||
4685 | if (control->final) { | |
4686 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4687 | l2cap_retransmit_all(chan, control); | |
4688 | } else { | |
4689 | l2cap_retransmit_all(chan, control); | |
4690 | l2cap_ertm_send(chan); | |
4691 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4692 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4693 | } | |
d2a7ac5d MM |
4694 | } |
4695 | ||
4b51dae9 MM |
4696 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4697 | { | |
4698 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4699 | ||
4700 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4701 | chan->expected_tx_seq); | |
4702 | ||
4703 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4704 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 4705 | chan->tx_win) { |
4b51dae9 MM |
4706 | /* See notes below regarding "double poll" and |
4707 | * invalid packets. | |
4708 | */ | |
4709 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4710 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4711 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4712 | } else { | |
4713 | BT_DBG("Invalid - in window after SREJ sent"); | |
4714 | return L2CAP_TXSEQ_INVALID; | |
4715 | } | |
4716 | } | |
4717 | ||
4718 | if (chan->srej_list.head == txseq) { | |
4719 | BT_DBG("Expected SREJ"); | |
4720 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4721 | } | |
4722 | ||
4723 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4724 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4725 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4726 | } | |
4727 | ||
4728 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4729 | BT_DBG("Unexpected SREJ - not requested"); | |
4730 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4731 | } | |
4732 | } | |
4733 | ||
4734 | if (chan->expected_tx_seq == txseq) { | |
4735 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4736 | chan->tx_win) { | |
4737 | BT_DBG("Invalid - txseq outside tx window"); | |
4738 | return L2CAP_TXSEQ_INVALID; | |
4739 | } else { | |
4740 | BT_DBG("Expected"); | |
4741 | return L2CAP_TXSEQ_EXPECTED; | |
4742 | } | |
4743 | } | |
4744 | ||
4745 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 4746 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
4747 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
4748 | return L2CAP_TXSEQ_DUPLICATE; | |
4749 | } | |
4750 | ||
4751 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4752 | /* A source of invalid packets is a "double poll" condition, | |
4753 | * where delays cause us to send multiple poll packets. If | |
4754 | * the remote stack receives and processes both polls, | |
4755 | * sequence numbers can wrap around in such a way that a | |
4756 | * resent frame has a sequence number that looks like new data | |
4757 | * with a sequence gap. This would trigger an erroneous SREJ | |
4758 | * request. | |
4759 | * | |
4760 | * Fortunately, this is impossible with a tx window that's | |
4761 | * less than half of the maximum sequence number, which allows | |
4762 | * invalid frames to be safely ignored. | |
4763 | * | |
4764 | * With tx window sizes greater than half of the tx window | |
4765 | * maximum, the frame is invalid and cannot be ignored. This | |
4766 | * causes a disconnect. | |
4767 | */ | |
4768 | ||
4769 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4770 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4771 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4772 | } else { | |
4773 | BT_DBG("Invalid - txseq outside tx window"); | |
4774 | return L2CAP_TXSEQ_INVALID; | |
4775 | } | |
4776 | } else { | |
4777 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4778 | return L2CAP_TXSEQ_UNEXPECTED; | |
4779 | } | |
4780 | } | |
4781 | ||
d2a7ac5d MM |
4782 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4783 | struct l2cap_ctrl *control, | |
4784 | struct sk_buff *skb, u8 event) | |
4785 | { | |
4786 | int err = 0; | |
4787 | bool skb_in_use = 0; | |
4788 | ||
4789 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4790 | event); | |
4791 | ||
4792 | switch (event) { | |
4793 | case L2CAP_EV_RECV_IFRAME: | |
4794 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4795 | case L2CAP_TXSEQ_EXPECTED: | |
4796 | l2cap_pass_to_tx(chan, control); | |
4797 | ||
4798 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4799 | BT_DBG("Busy, discarding expected seq %d", | |
4800 | control->txseq); | |
4801 | break; | |
4802 | } | |
4803 | ||
4804 | chan->expected_tx_seq = __next_seq(chan, | |
4805 | control->txseq); | |
4806 | ||
4807 | chan->buffer_seq = chan->expected_tx_seq; | |
4808 | skb_in_use = 1; | |
4809 | ||
4810 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4811 | if (err) | |
4812 | break; | |
4813 | ||
4814 | if (control->final) { | |
4815 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4816 | &chan->conn_state)) { | |
4817 | control->final = 0; | |
4818 | l2cap_retransmit_all(chan, control); | |
4819 | l2cap_ertm_send(chan); | |
4820 | } | |
4821 | } | |
4822 | ||
4823 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4824 | l2cap_send_ack(chan); | |
4825 | break; | |
4826 | case L2CAP_TXSEQ_UNEXPECTED: | |
4827 | l2cap_pass_to_tx(chan, control); | |
4828 | ||
4829 | /* Can't issue SREJ frames in the local busy state. | |
4830 | * Drop this frame, it will be seen as missing | |
4831 | * when local busy is exited. | |
4832 | */ | |
4833 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4834 | BT_DBG("Busy, discarding unexpected seq %d", | |
4835 | control->txseq); | |
4836 | break; | |
4837 | } | |
4838 | ||
4839 | /* There was a gap in the sequence, so an SREJ | |
4840 | * must be sent for each missing frame. The | |
4841 | * current frame is stored for later use. | |
4842 | */ | |
4843 | skb_queue_tail(&chan->srej_q, skb); | |
4844 | skb_in_use = 1; | |
4845 | BT_DBG("Queued %p (queue len %d)", skb, | |
4846 | skb_queue_len(&chan->srej_q)); | |
4847 | ||
4848 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4849 | l2cap_seq_list_clear(&chan->srej_list); | |
4850 | l2cap_send_srej(chan, control->txseq); | |
4851 | ||
4852 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4853 | break; | |
4854 | case L2CAP_TXSEQ_DUPLICATE: | |
4855 | l2cap_pass_to_tx(chan, control); | |
4856 | break; | |
4857 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4858 | break; | |
4859 | case L2CAP_TXSEQ_INVALID: | |
4860 | default: | |
4861 | l2cap_send_disconn_req(chan->conn, chan, | |
4862 | ECONNRESET); | |
4863 | break; | |
4864 | } | |
4865 | break; | |
4866 | case L2CAP_EV_RECV_RR: | |
4867 | l2cap_pass_to_tx(chan, control); | |
4868 | if (control->final) { | |
4869 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4870 | ||
4871 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4872 | &chan->conn_state)) { | |
4873 | control->final = 0; | |
4874 | l2cap_retransmit_all(chan, control); | |
4875 | } | |
4876 | ||
4877 | l2cap_ertm_send(chan); | |
4878 | } else if (control->poll) { | |
4879 | l2cap_send_i_or_rr_or_rnr(chan); | |
4880 | } else { | |
4881 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4882 | &chan->conn_state) && | |
4883 | chan->unacked_frames) | |
4884 | __set_retrans_timer(chan); | |
4885 | ||
4886 | l2cap_ertm_send(chan); | |
4887 | } | |
4888 | break; | |
4889 | case L2CAP_EV_RECV_RNR: | |
4890 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4891 | l2cap_pass_to_tx(chan, control); | |
4892 | if (control && control->poll) { | |
4893 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4894 | l2cap_send_rr_or_rnr(chan, 0); | |
4895 | } | |
4896 | __clear_retrans_timer(chan); | |
4897 | l2cap_seq_list_clear(&chan->retrans_list); | |
4898 | break; | |
4899 | case L2CAP_EV_RECV_REJ: | |
4900 | l2cap_handle_rej(chan, control); | |
4901 | break; | |
4902 | case L2CAP_EV_RECV_SREJ: | |
4903 | l2cap_handle_srej(chan, control); | |
4904 | break; | |
4905 | default: | |
4906 | break; | |
4907 | } | |
4908 | ||
4909 | if (skb && !skb_in_use) { | |
4910 | BT_DBG("Freeing %p", skb); | |
4911 | kfree_skb(skb); | |
4912 | } | |
4913 | ||
4914 | return err; | |
4915 | } | |
4916 | ||
4917 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4918 | struct l2cap_ctrl *control, | |
4919 | struct sk_buff *skb, u8 event) | |
4920 | { | |
4921 | int err = 0; | |
4922 | u16 txseq = control->txseq; | |
4923 | bool skb_in_use = 0; | |
4924 | ||
4925 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4926 | event); | |
4927 | ||
4928 | switch (event) { | |
4929 | case L2CAP_EV_RECV_IFRAME: | |
4930 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4931 | case L2CAP_TXSEQ_EXPECTED: | |
4932 | /* Keep frame for reassembly later */ | |
4933 | l2cap_pass_to_tx(chan, control); | |
4934 | skb_queue_tail(&chan->srej_q, skb); | |
4935 | skb_in_use = 1; | |
4936 | BT_DBG("Queued %p (queue len %d)", skb, | |
4937 | skb_queue_len(&chan->srej_q)); | |
4938 | ||
4939 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4940 | break; | |
4941 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4942 | l2cap_seq_list_pop(&chan->srej_list); | |
4943 | ||
4944 | l2cap_pass_to_tx(chan, control); | |
4945 | skb_queue_tail(&chan->srej_q, skb); | |
4946 | skb_in_use = 1; | |
4947 | BT_DBG("Queued %p (queue len %d)", skb, | |
4948 | skb_queue_len(&chan->srej_q)); | |
4949 | ||
4950 | err = l2cap_rx_queued_iframes(chan); | |
4951 | if (err) | |
4952 | break; | |
4953 | ||
4954 | break; | |
4955 | case L2CAP_TXSEQ_UNEXPECTED: | |
4956 | /* Got a frame that can't be reassembled yet. | |
4957 | * Save it for later, and send SREJs to cover | |
4958 | * the missing frames. | |
4959 | */ | |
4960 | skb_queue_tail(&chan->srej_q, skb); | |
4961 | skb_in_use = 1; | |
4962 | BT_DBG("Queued %p (queue len %d)", skb, | |
4963 | skb_queue_len(&chan->srej_q)); | |
4964 | ||
4965 | l2cap_pass_to_tx(chan, control); | |
4966 | l2cap_send_srej(chan, control->txseq); | |
4967 | break; | |
4968 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4969 | /* This frame was requested with an SREJ, but | |
4970 | * some expected retransmitted frames are | |
4971 | * missing. Request retransmission of missing | |
4972 | * SREJ'd frames. | |
4973 | */ | |
4974 | skb_queue_tail(&chan->srej_q, skb); | |
4975 | skb_in_use = 1; | |
4976 | BT_DBG("Queued %p (queue len %d)", skb, | |
4977 | skb_queue_len(&chan->srej_q)); | |
4978 | ||
4979 | l2cap_pass_to_tx(chan, control); | |
4980 | l2cap_send_srej_list(chan, control->txseq); | |
4981 | break; | |
4982 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4983 | /* We've already queued this frame. Drop this copy. */ | |
4984 | l2cap_pass_to_tx(chan, control); | |
4985 | break; | |
4986 | case L2CAP_TXSEQ_DUPLICATE: | |
4987 | /* Expecting a later sequence number, so this frame | |
4988 | * was already received. Ignore it completely. | |
4989 | */ | |
4990 | break; | |
4991 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4992 | break; | |
4993 | case L2CAP_TXSEQ_INVALID: | |
4994 | default: | |
4995 | l2cap_send_disconn_req(chan->conn, chan, | |
4996 | ECONNRESET); | |
4997 | break; | |
4998 | } | |
4999 | break; | |
5000 | case L2CAP_EV_RECV_RR: | |
5001 | l2cap_pass_to_tx(chan, control); | |
5002 | if (control->final) { | |
5003 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5004 | ||
5005 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5006 | &chan->conn_state)) { | |
5007 | control->final = 0; | |
5008 | l2cap_retransmit_all(chan, control); | |
5009 | } | |
5010 | ||
5011 | l2cap_ertm_send(chan); | |
5012 | } else if (control->poll) { | |
5013 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5014 | &chan->conn_state) && | |
5015 | chan->unacked_frames) { | |
5016 | __set_retrans_timer(chan); | |
5017 | } | |
5018 | ||
5019 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5020 | l2cap_send_srej_tail(chan); | |
5021 | } else { | |
5022 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5023 | &chan->conn_state) && | |
5024 | chan->unacked_frames) | |
5025 | __set_retrans_timer(chan); | |
5026 | ||
5027 | l2cap_send_ack(chan); | |
5028 | } | |
5029 | break; | |
5030 | case L2CAP_EV_RECV_RNR: | |
5031 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5032 | l2cap_pass_to_tx(chan, control); | |
5033 | if (control->poll) { | |
5034 | l2cap_send_srej_tail(chan); | |
5035 | } else { | |
5036 | struct l2cap_ctrl rr_control; | |
5037 | memset(&rr_control, 0, sizeof(rr_control)); | |
5038 | rr_control.sframe = 1; | |
5039 | rr_control.super = L2CAP_SUPER_RR; | |
5040 | rr_control.reqseq = chan->buffer_seq; | |
5041 | l2cap_send_sframe(chan, &rr_control); | |
5042 | } | |
5043 | ||
5044 | break; | |
5045 | case L2CAP_EV_RECV_REJ: | |
5046 | l2cap_handle_rej(chan, control); | |
5047 | break; | |
5048 | case L2CAP_EV_RECV_SREJ: | |
5049 | l2cap_handle_srej(chan, control); | |
5050 | break; | |
5051 | } | |
5052 | ||
5053 | if (skb && !skb_in_use) { | |
5054 | BT_DBG("Freeing %p", skb); | |
5055 | kfree_skb(skb); | |
5056 | } | |
5057 | ||
5058 | return err; | |
5059 | } | |
5060 | ||
5061 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5062 | { | |
5063 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5064 | u16 unacked; | |
5065 | ||
5066 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5067 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5068 | } | |
5069 | ||
cec8ab6e MM |
5070 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5071 | struct sk_buff *skb, u8 event) | |
218bb9df | 5072 | { |
d2a7ac5d MM |
5073 | int err = 0; |
5074 | ||
5075 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5076 | control, skb, event, chan->rx_state); | |
5077 | ||
5078 | if (__valid_reqseq(chan, control->reqseq)) { | |
5079 | switch (chan->rx_state) { | |
5080 | case L2CAP_RX_STATE_RECV: | |
5081 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5082 | break; | |
5083 | case L2CAP_RX_STATE_SREJ_SENT: | |
5084 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5085 | event); | |
5086 | break; | |
5087 | default: | |
5088 | /* shut it down */ | |
5089 | break; | |
5090 | } | |
5091 | } else { | |
5092 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5093 | control->reqseq, chan->next_tx_seq, | |
5094 | chan->expected_ack_seq); | |
5095 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5096 | } | |
5097 | ||
5098 | return err; | |
cec8ab6e MM |
5099 | } |
5100 | ||
5101 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5102 | struct sk_buff *skb) | |
5103 | { | |
4b51dae9 MM |
5104 | int err = 0; |
5105 | ||
5106 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5107 | chan->rx_state); | |
5108 | ||
5109 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5110 | L2CAP_TXSEQ_EXPECTED) { | |
5111 | l2cap_pass_to_tx(chan, control); | |
5112 | ||
5113 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5114 | __next_seq(chan, chan->buffer_seq)); | |
5115 | ||
5116 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5117 | ||
5118 | l2cap_reassemble_sdu(chan, skb, control); | |
5119 | } else { | |
5120 | if (chan->sdu) { | |
5121 | kfree_skb(chan->sdu); | |
5122 | chan->sdu = NULL; | |
5123 | } | |
5124 | chan->sdu_last_frag = NULL; | |
5125 | chan->sdu_len = 0; | |
5126 | ||
5127 | if (skb) { | |
5128 | BT_DBG("Freeing %p", skb); | |
5129 | kfree_skb(skb); | |
5130 | } | |
5131 | } | |
5132 | ||
5133 | chan->last_acked_seq = control->txseq; | |
5134 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5135 | ||
5136 | return err; | |
cec8ab6e MM |
5137 | } |
5138 | ||
5139 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5140 | { | |
5141 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5142 | u16 len; | |
5143 | u8 event; | |
218bb9df | 5144 | |
b76bbd66 MM |
5145 | __unpack_control(chan, skb); |
5146 | ||
218bb9df GP |
5147 | len = skb->len; |
5148 | ||
5149 | /* | |
5150 | * We can just drop the corrupted I-frame here. | |
5151 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5152 | * procedures and ask for retransmission. |
218bb9df | 5153 | */ |
47d1ec61 | 5154 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5155 | goto drop; |
5156 | ||
cec8ab6e | 5157 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5158 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5159 | |
47d1ec61 | 5160 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5161 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5162 | |
47d1ec61 | 5163 | if (len > chan->mps) { |
8c1d787b | 5164 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5165 | goto drop; |
5166 | } | |
5167 | ||
cec8ab6e MM |
5168 | if (!control->sframe) { |
5169 | int err; | |
218bb9df | 5170 | |
cec8ab6e MM |
5171 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5172 | control->sar, control->reqseq, control->final, | |
5173 | control->txseq); | |
218bb9df | 5174 | |
cec8ab6e MM |
5175 | /* Validate F-bit - F=0 always valid, F=1 only |
5176 | * valid in TX WAIT_F | |
5177 | */ | |
5178 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5179 | goto drop; |
cec8ab6e MM |
5180 | |
5181 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5182 | event = L2CAP_EV_RECV_IFRAME; | |
5183 | err = l2cap_rx(chan, control, skb, event); | |
5184 | } else { | |
5185 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5186 | } |
5187 | ||
cec8ab6e MM |
5188 | if (err) |
5189 | l2cap_send_disconn_req(chan->conn, chan, | |
5190 | ECONNRESET); | |
218bb9df | 5191 | } else { |
cec8ab6e MM |
5192 | const u8 rx_func_to_event[4] = { |
5193 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5194 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5195 | }; | |
5196 | ||
5197 | /* Only I-frames are expected in streaming mode */ | |
5198 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5199 | goto drop; | |
5200 | ||
5201 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5202 | control->reqseq, control->final, control->poll, | |
5203 | control->super); | |
5204 | ||
218bb9df GP |
5205 | if (len != 0) { |
5206 | BT_ERR("%d", len); | |
8c1d787b | 5207 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5208 | goto drop; |
5209 | } | |
5210 | ||
cec8ab6e MM |
5211 | /* Validate F and P bits */ |
5212 | if (control->final && (control->poll || | |
5213 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5214 | goto drop; | |
5215 | ||
5216 | event = rx_func_to_event[control->super]; | |
5217 | if (l2cap_rx(chan, control, skb, event)) | |
5218 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5219 | } |
5220 | ||
5221 | return 0; | |
5222 | ||
5223 | drop: | |
5224 | kfree_skb(skb); | |
5225 | return 0; | |
5226 | } | |
5227 | ||
13ca56e0 AE |
5228 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5229 | struct sk_buff *skb) | |
1da177e4 | 5230 | { |
48454079 | 5231 | struct l2cap_chan *chan; |
1da177e4 | 5232 | |
baa7e1fa | 5233 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5234 | if (!chan) { |
97e8e89d AE |
5235 | if (cid == L2CAP_CID_A2MP) { |
5236 | chan = a2mp_channel_create(conn, skb); | |
5237 | if (!chan) { | |
5238 | kfree_skb(skb); | |
13ca56e0 | 5239 | return; |
97e8e89d AE |
5240 | } |
5241 | ||
5242 | l2cap_chan_lock(chan); | |
5243 | } else { | |
5244 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5245 | /* Drop packet and return */ | |
5246 | kfree_skb(skb); | |
13ca56e0 | 5247 | return; |
97e8e89d | 5248 | } |
1da177e4 LT |
5249 | } |
5250 | ||
49208c9c | 5251 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5252 | |
89bc500e | 5253 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5254 | goto drop; |
5255 | ||
0c1bc5c6 | 5256 | switch (chan->mode) { |
1c2acffb GP |
5257 | case L2CAP_MODE_BASIC: |
5258 | /* If socket recv buffers overflows we drop data here | |
5259 | * which is *bad* because L2CAP has to be reliable. | |
5260 | * But we don't have any other choice. L2CAP doesn't | |
5261 | * provide flow control mechanism. */ | |
1da177e4 | 5262 | |
0c1bc5c6 | 5263 | if (chan->imtu < skb->len) |
1c2acffb | 5264 | goto drop; |
1da177e4 | 5265 | |
80b98027 | 5266 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5267 | goto done; |
5268 | break; | |
5269 | ||
5270 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5271 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5272 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5273 | goto done; |
5274 | ||
1c2acffb | 5275 | default: |
0c1bc5c6 | 5276 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5277 | break; |
5278 | } | |
1da177e4 LT |
5279 | |
5280 | drop: | |
5281 | kfree_skb(skb); | |
5282 | ||
5283 | done: | |
6be36555 | 5284 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5285 | } |
5286 | ||
84104b24 AE |
5287 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5288 | struct sk_buff *skb) | |
1da177e4 | 5289 | { |
23691d75 | 5290 | struct l2cap_chan *chan; |
1da177e4 | 5291 | |
c2287681 | 5292 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5293 | if (!chan) |
1da177e4 LT |
5294 | goto drop; |
5295 | ||
5b4cedaa | 5296 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5297 | |
89bc500e | 5298 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5299 | goto drop; |
5300 | ||
e13e21dc | 5301 | if (chan->imtu < skb->len) |
1da177e4 LT |
5302 | goto drop; |
5303 | ||
80b98027 | 5304 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5305 | return; |
1da177e4 LT |
5306 | |
5307 | drop: | |
5308 | kfree_skb(skb); | |
1da177e4 LT |
5309 | } |
5310 | ||
6810fca7 AE |
5311 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5312 | struct sk_buff *skb) | |
9f69bda6 | 5313 | { |
23691d75 | 5314 | struct l2cap_chan *chan; |
9f69bda6 | 5315 | |
c2287681 | 5316 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5317 | if (!chan) |
9f69bda6 GP |
5318 | goto drop; |
5319 | ||
5b4cedaa | 5320 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5321 | |
89bc500e | 5322 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5323 | goto drop; |
5324 | ||
e13e21dc | 5325 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5326 | goto drop; |
5327 | ||
80b98027 | 5328 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5329 | return; |
9f69bda6 GP |
5330 | |
5331 | drop: | |
5332 | kfree_skb(skb); | |
9f69bda6 GP |
5333 | } |
5334 | ||
1da177e4 LT |
5335 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5336 | { | |
5337 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5338 | u16 cid, len; |
5339 | __le16 psm; | |
1da177e4 LT |
5340 | |
5341 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5342 | cid = __le16_to_cpu(lh->cid); | |
5343 | len = __le16_to_cpu(lh->len); | |
5344 | ||
1c2acffb GP |
5345 | if (len != skb->len) { |
5346 | kfree_skb(skb); | |
5347 | return; | |
5348 | } | |
5349 | ||
1da177e4 LT |
5350 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5351 | ||
5352 | switch (cid) { | |
3300d9a9 | 5353 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5354 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5355 | l2cap_sig_channel(conn, skb); |
5356 | break; | |
5357 | ||
8db4dc46 | 5358 | case L2CAP_CID_CONN_LESS: |
097db76c | 5359 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5360 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5361 | l2cap_conless_channel(conn, psm, skb); |
5362 | break; | |
5363 | ||
9f69bda6 GP |
5364 | case L2CAP_CID_LE_DATA: |
5365 | l2cap_att_channel(conn, cid, skb); | |
5366 | break; | |
5367 | ||
b501d6a1 AB |
5368 | case L2CAP_CID_SMP: |
5369 | if (smp_sig_channel(conn, skb)) | |
5370 | l2cap_conn_del(conn->hcon, EACCES); | |
5371 | break; | |
5372 | ||
1da177e4 LT |
5373 | default: |
5374 | l2cap_data_channel(conn, cid, skb); | |
5375 | break; | |
5376 | } | |
5377 | } | |
5378 | ||
5379 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5380 | ||
686ebf28 | 5381 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5382 | { |
5383 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5384 | struct l2cap_chan *c; |
1da177e4 | 5385 | |
6ed93dc6 | 5386 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
5387 | |
5388 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5389 | read_lock(&chan_list_lock); |
5390 | list_for_each_entry(c, &chan_list, global_l) { | |
5391 | struct sock *sk = c->sk; | |
4343478f | 5392 | |
89bc500e | 5393 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5394 | continue; |
5395 | ||
5396 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5397 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5398 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5399 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5400 | exact++; |
2af6b9d5 MH |
5401 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5402 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5403 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5404 | lm2 |= HCI_LM_MASTER; |
5405 | } | |
1da177e4 | 5406 | } |
23691d75 | 5407 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5408 | |
5409 | return exact ? lm1 : lm2; | |
5410 | } | |
5411 | ||
9e664631 | 5412 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5413 | { |
0139418c MH |
5414 | struct l2cap_conn *conn; |
5415 | ||
6ed93dc6 | 5416 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 5417 | |
1da177e4 | 5418 | if (!status) { |
1da177e4 LT |
5419 | conn = l2cap_conn_add(hcon, status); |
5420 | if (conn) | |
5421 | l2cap_conn_ready(conn); | |
0139418c | 5422 | } else |
e175072f | 5423 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 | 5424 | |
1da177e4 LT |
5425 | } |
5426 | ||
686ebf28 | 5427 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5428 | { |
5429 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5430 | ||
5431 | BT_DBG("hcon %p", hcon); | |
5432 | ||
686ebf28 | 5433 | if (!conn) |
9f5a0d7b | 5434 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5435 | return conn->disc_reason; |
5436 | } | |
5437 | ||
9e664631 | 5438 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5439 | { |
5440 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5441 | ||
e175072f | 5442 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5443 | } |
5444 | ||
4343478f | 5445 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5446 | { |
715ec005 | 5447 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5448 | return; |
5449 | ||
f62e4323 | 5450 | if (encrypt == 0x00) { |
4343478f | 5451 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5452 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5453 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5454 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5455 | } else { |
4343478f | 5456 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5457 | __clear_chan_timer(chan); |
f62e4323 MH |
5458 | } |
5459 | } | |
5460 | ||
686ebf28 | 5461 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5462 | { |
0139418c | 5463 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5464 | struct l2cap_chan *chan; |
1da177e4 | 5465 | |
0139418c | 5466 | if (!conn) |
1da177e4 | 5467 | return 0; |
0139418c | 5468 | |
89d8b407 | 5469 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 5470 | |
160dc6ac | 5471 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5472 | if (!status && encrypt) |
5473 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5474 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5475 | } |
5476 | ||
3df91ea2 | 5477 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5478 | |
3df91ea2 | 5479 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5480 | l2cap_chan_lock(chan); |
1da177e4 | 5481 | |
89d8b407 AE |
5482 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
5483 | state_to_string(chan->state)); | |
f1cb9af5 | 5484 | |
78eb2f98 AE |
5485 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
5486 | l2cap_chan_unlock(chan); | |
5487 | continue; | |
5488 | } | |
5489 | ||
f1cb9af5 VCG |
5490 | if (chan->scid == L2CAP_CID_LE_DATA) { |
5491 | if (!status && encrypt) { | |
5492 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5493 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5494 | } |
5495 | ||
6be36555 | 5496 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5497 | continue; |
5498 | } | |
5499 | ||
c1360a1c | 5500 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5501 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5502 | continue; |
5503 | } | |
5504 | ||
89bc500e | 5505 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 5506 | chan->state == BT_CONFIG)) { |
a7d7723a GP |
5507 | struct sock *sk = chan->sk; |
5508 | ||
c5daa683 | 5509 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5510 | sk->sk_state_change(sk); |
5511 | ||
4343478f | 5512 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5513 | l2cap_chan_unlock(chan); |
9719f8af MH |
5514 | continue; |
5515 | } | |
5516 | ||
89bc500e | 5517 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5518 | if (!status) { |
93c3e8f5 | 5519 | l2cap_start_connection(chan); |
b1235d79 | 5520 | } else { |
ba13ccd9 | 5521 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5522 | } |
89bc500e | 5523 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5524 | struct sock *sk = chan->sk; |
b1235d79 | 5525 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5526 | __u16 res, stat; |
1da177e4 | 5527 | |
6be36555 AE |
5528 | lock_sock(sk); |
5529 | ||
b1235d79 | 5530 | if (!status) { |
c5daa683 GP |
5531 | if (test_bit(BT_SK_DEFER_SETUP, |
5532 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5533 | struct sock *parent = bt_sk(sk)->parent; |
5534 | res = L2CAP_CR_PEND; | |
5535 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5536 | if (parent) |
5537 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5538 | } else { |
0e587be7 | 5539 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5540 | res = L2CAP_CR_SUCCESS; |
5541 | stat = L2CAP_CS_NO_INFO; | |
5542 | } | |
b1235d79 | 5543 | } else { |
0e587be7 | 5544 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5545 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5546 | res = L2CAP_CR_SEC_BLOCK; |
5547 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5548 | } |
5549 | ||
6be36555 AE |
5550 | release_sock(sk); |
5551 | ||
fe4128e0 GP |
5552 | rsp.scid = cpu_to_le16(chan->dcid); |
5553 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5554 | rsp.result = cpu_to_le16(res); |
5555 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 5556 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 5557 | sizeof(rsp), &rsp); |
2d369359 MM |
5558 | |
5559 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5560 | res == L2CAP_CR_SUCCESS) { | |
5561 | char buf[128]; | |
5562 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5563 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5564 | L2CAP_CONF_REQ, | |
5565 | l2cap_build_conf_req(chan, buf), | |
5566 | buf); | |
5567 | chan->num_conf_req++; | |
5568 | } | |
b1235d79 | 5569 | } |
1da177e4 | 5570 | |
6be36555 | 5571 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5572 | } |
5573 | ||
3df91ea2 | 5574 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5575 | |
1da177e4 LT |
5576 | return 0; |
5577 | } | |
5578 | ||
686ebf28 | 5579 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5580 | { |
5581 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5582 | ||
5a08ecce AE |
5583 | if (!conn) |
5584 | conn = l2cap_conn_add(hcon, 0); | |
5585 | ||
5586 | if (!conn) | |
1da177e4 LT |
5587 | goto drop; |
5588 | ||
5589 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5590 | ||
e702112f | 5591 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5592 | struct l2cap_hdr *hdr; |
5593 | int len; | |
5594 | ||
5595 | if (conn->rx_len) { | |
5596 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5597 | kfree_skb(conn->rx_skb); | |
5598 | conn->rx_skb = NULL; | |
5599 | conn->rx_len = 0; | |
5600 | l2cap_conn_unreliable(conn, ECOMM); | |
5601 | } | |
5602 | ||
aae7fe22 AE |
5603 | /* Start fragment always begin with Basic L2CAP header */ |
5604 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5605 | BT_ERR("Frame is too short (len %d)", skb->len); |
5606 | l2cap_conn_unreliable(conn, ECOMM); | |
5607 | goto drop; | |
5608 | } | |
5609 | ||
5610 | hdr = (struct l2cap_hdr *) skb->data; | |
5611 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5612 | ||
5613 | if (len == skb->len) { | |
5614 | /* Complete frame received */ | |
5615 | l2cap_recv_frame(conn, skb); | |
5616 | return 0; | |
5617 | } | |
5618 | ||
5619 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5620 | ||
5621 | if (skb->len > len) { | |
5622 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 5623 | skb->len, len); |
1da177e4 LT |
5624 | l2cap_conn_unreliable(conn, ECOMM); |
5625 | goto drop; | |
5626 | } | |
5627 | ||
5628 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 5629 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 5630 | if (!conn->rx_skb) |
1da177e4 LT |
5631 | goto drop; |
5632 | ||
d626f62b | 5633 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5634 | skb->len); |
1da177e4 LT |
5635 | conn->rx_len = len - skb->len; |
5636 | } else { | |
5637 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5638 | ||
5639 | if (!conn->rx_len) { | |
5640 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5641 | l2cap_conn_unreliable(conn, ECOMM); | |
5642 | goto drop; | |
5643 | } | |
5644 | ||
5645 | if (skb->len > conn->rx_len) { | |
5646 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 5647 | skb->len, conn->rx_len); |
1da177e4 LT |
5648 | kfree_skb(conn->rx_skb); |
5649 | conn->rx_skb = NULL; | |
5650 | conn->rx_len = 0; | |
5651 | l2cap_conn_unreliable(conn, ECOMM); | |
5652 | goto drop; | |
5653 | } | |
5654 | ||
d626f62b | 5655 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5656 | skb->len); |
1da177e4 LT |
5657 | conn->rx_len -= skb->len; |
5658 | ||
5659 | if (!conn->rx_len) { | |
5660 | /* Complete frame received */ | |
5661 | l2cap_recv_frame(conn, conn->rx_skb); | |
5662 | conn->rx_skb = NULL; | |
5663 | } | |
5664 | } | |
5665 | ||
5666 | drop: | |
5667 | kfree_skb(skb); | |
5668 | return 0; | |
5669 | } | |
5670 | ||
aef7d97c | 5671 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5672 | { |
23691d75 | 5673 | struct l2cap_chan *c; |
1da177e4 | 5674 | |
333055f2 | 5675 | read_lock(&chan_list_lock); |
1da177e4 | 5676 | |
23691d75 GP |
5677 | list_for_each_entry(c, &chan_list, global_l) { |
5678 | struct sock *sk = c->sk; | |
101545f6 | 5679 | |
fcb73338 AE |
5680 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
5681 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
5682 | c->state, __le16_to_cpu(c->psm), | |
5683 | c->scid, c->dcid, c->imtu, c->omtu, | |
5684 | c->sec_level, c->mode); | |
61e1b4b7 | 5685 | } |
1da177e4 | 5686 | |
333055f2 | 5687 | read_unlock(&chan_list_lock); |
1da177e4 | 5688 | |
aef7d97c | 5689 | return 0; |
1da177e4 LT |
5690 | } |
5691 | ||
aef7d97c MH |
5692 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5693 | { | |
5694 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5695 | } | |
5696 | ||
5697 | static const struct file_operations l2cap_debugfs_fops = { | |
5698 | .open = l2cap_debugfs_open, | |
5699 | .read = seq_read, | |
5700 | .llseek = seq_lseek, | |
5701 | .release = single_release, | |
5702 | }; | |
5703 | ||
5704 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5705 | |
64274518 | 5706 | int __init l2cap_init(void) |
1da177e4 LT |
5707 | { |
5708 | int err; | |
be9d1227 | 5709 | |
bb58f747 | 5710 | err = l2cap_init_sockets(); |
1da177e4 LT |
5711 | if (err < 0) |
5712 | return err; | |
5713 | ||
aef7d97c | 5714 | if (bt_debugfs) { |
2d792818 GP |
5715 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
5716 | NULL, &l2cap_debugfs_fops); | |
aef7d97c MH |
5717 | if (!l2cap_debugfs) |
5718 | BT_ERR("Failed to create L2CAP debug file"); | |
5719 | } | |
1da177e4 | 5720 | |
1da177e4 | 5721 | return 0; |
1da177e4 LT |
5722 | } |
5723 | ||
64274518 | 5724 | void l2cap_exit(void) |
1da177e4 | 5725 | { |
aef7d97c | 5726 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5727 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5728 | } |
5729 | ||
d1c4a17d GP |
5730 | module_param(disable_ertm, bool, 0644); |
5731 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |