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 | ||
b699ec0d | 545 | chan->ops->teardown(chan, err); |
6be36555 | 546 | |
2827011f | 547 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 548 | return; |
2ead70b8 | 549 | |
ee556f66 GP |
550 | switch(chan->mode) { |
551 | case L2CAP_MODE_BASIC: | |
552 | break; | |
c13ffa62 | 553 | |
ee556f66 | 554 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
555 | __clear_retrans_timer(chan); |
556 | __clear_monitor_timer(chan); | |
557 | __clear_ack_timer(chan); | |
c13ffa62 | 558 | |
f1c6775b | 559 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 560 | |
3c588192 MM |
561 | l2cap_seq_list_free(&chan->srej_list); |
562 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
563 | |
564 | /* fall through */ | |
565 | ||
566 | case L2CAP_MODE_STREAMING: | |
567 | skb_queue_purge(&chan->tx_q); | |
568 | break; | |
c13ffa62 | 569 | } |
ee556f66 GP |
570 | |
571 | return; | |
0139418c MH |
572 | } |
573 | ||
0f852724 | 574 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
575 | { |
576 | struct l2cap_conn *conn = chan->conn; | |
577 | struct sock *sk = chan->sk; | |
578 | ||
2d792818 GP |
579 | BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
580 | sk); | |
4519de9a | 581 | |
89bc500e | 582 | switch (chan->state) { |
4519de9a | 583 | case BT_LISTEN: |
b699ec0d | 584 | chan->ops->teardown(chan, 0); |
4519de9a GP |
585 | break; |
586 | ||
587 | case BT_CONNECTED: | |
588 | case BT_CONFIG: | |
715ec005 | 589 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 590 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 591 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
592 | l2cap_send_disconn_req(conn, chan, reason); |
593 | } else | |
594 | l2cap_chan_del(chan, reason); | |
595 | break; | |
596 | ||
597 | case BT_CONNECT2: | |
715ec005 | 598 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 599 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
600 | struct l2cap_conn_rsp rsp; |
601 | __u16 result; | |
602 | ||
c5daa683 | 603 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
604 | result = L2CAP_CR_SEC_BLOCK; |
605 | else | |
606 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 607 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
608 | |
609 | rsp.scid = cpu_to_le16(chan->dcid); | |
610 | rsp.dcid = cpu_to_le16(chan->scid); | |
611 | rsp.result = cpu_to_le16(result); | |
ac73498c | 612 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 613 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 614 | sizeof(rsp), &rsp); |
4519de9a GP |
615 | } |
616 | ||
617 | l2cap_chan_del(chan, reason); | |
618 | break; | |
619 | ||
620 | case BT_CONNECT: | |
621 | case BT_DISCONN: | |
622 | l2cap_chan_del(chan, reason); | |
623 | break; | |
624 | ||
625 | default: | |
b699ec0d | 626 | chan->ops->teardown(chan, 0); |
4519de9a GP |
627 | break; |
628 | } | |
629 | } | |
630 | ||
4343478f | 631 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 632 | { |
715ec005 | 633 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 634 | switch (chan->sec_level) { |
8556edd3 JH |
635 | case BT_SECURITY_HIGH: |
636 | return HCI_AT_DEDICATED_BONDING_MITM; | |
637 | case BT_SECURITY_MEDIUM: | |
638 | return HCI_AT_DEDICATED_BONDING; | |
639 | default: | |
640 | return HCI_AT_NO_BONDING; | |
641 | } | |
2983fd68 | 642 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
643 | if (chan->sec_level == BT_SECURITY_LOW) |
644 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 645 | |
4343478f | 646 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 647 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 648 | else |
8556edd3 | 649 | return HCI_AT_NO_BONDING; |
00ae4af9 | 650 | } else { |
4343478f | 651 | switch (chan->sec_level) { |
00ae4af9 | 652 | case BT_SECURITY_HIGH: |
8556edd3 | 653 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 654 | case BT_SECURITY_MEDIUM: |
8556edd3 | 655 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 656 | default: |
8556edd3 | 657 | return HCI_AT_NO_BONDING; |
00ae4af9 | 658 | } |
0684e5f9 | 659 | } |
8556edd3 JH |
660 | } |
661 | ||
662 | /* Service level security */ | |
d45fc423 | 663 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 664 | { |
8c1d787b | 665 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
666 | __u8 auth_type; |
667 | ||
4343478f | 668 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 669 | |
4343478f | 670 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
671 | } |
672 | ||
b5ad8b7f | 673 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
674 | { |
675 | u8 id; | |
676 | ||
677 | /* Get next available identificator. | |
678 | * 1 - 128 are used by kernel. | |
679 | * 129 - 199 are reserved. | |
680 | * 200 - 254 are used by utilities like l2ping, etc. | |
681 | */ | |
682 | ||
333055f2 | 683 | spin_lock(&conn->lock); |
4e8402a3 MH |
684 | |
685 | if (++conn->tx_ident > 128) | |
686 | conn->tx_ident = 1; | |
687 | ||
688 | id = conn->tx_ident; | |
689 | ||
333055f2 | 690 | spin_unlock(&conn->lock); |
4e8402a3 MH |
691 | |
692 | return id; | |
693 | } | |
694 | ||
2d792818 GP |
695 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
696 | void *data) | |
4e8402a3 MH |
697 | { |
698 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 699 | u8 flags; |
4e8402a3 MH |
700 | |
701 | BT_DBG("code 0x%2.2x", code); | |
702 | ||
703 | if (!skb) | |
9a9c6a34 | 704 | return; |
4e8402a3 | 705 | |
e702112f AE |
706 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
707 | flags = ACL_START_NO_FLUSH; | |
708 | else | |
709 | flags = ACL_START; | |
710 | ||
14b12d0b | 711 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 712 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 713 | |
73d80deb LAD |
714 | hci_send_acl(conn->hchan, skb, flags); |
715 | } | |
716 | ||
717 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
718 | { | |
719 | struct hci_conn *hcon = chan->conn->hcon; | |
720 | u16 flags; | |
721 | ||
722 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 723 | skb->priority); |
73d80deb LAD |
724 | |
725 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
2d792818 | 726 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
727 | flags = ACL_START_NO_FLUSH; |
728 | else | |
729 | flags = ACL_START; | |
14b12d0b | 730 | |
73d80deb LAD |
731 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
732 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
733 | } |
734 | ||
b76bbd66 MM |
735 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
736 | { | |
737 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
738 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
739 | ||
740 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
741 | /* S-Frame */ | |
742 | control->sframe = 1; | |
743 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
744 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
745 | ||
746 | control->sar = 0; | |
747 | control->txseq = 0; | |
748 | } else { | |
749 | /* I-Frame */ | |
750 | control->sframe = 0; | |
751 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
752 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
753 | ||
754 | control->poll = 0; | |
755 | control->super = 0; | |
756 | } | |
757 | } | |
758 | ||
b76bbd66 MM |
759 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
760 | { | |
761 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
762 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
763 | ||
764 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
765 | /* S-Frame */ | |
766 | control->sframe = 1; | |
767 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
768 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
769 | ||
770 | control->sar = 0; | |
771 | control->txseq = 0; | |
772 | } else { | |
773 | /* I-Frame */ | |
774 | control->sframe = 0; | |
775 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
776 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
777 | ||
778 | control->poll = 0; | |
779 | control->super = 0; | |
780 | } | |
781 | } | |
782 | ||
783 | static inline void __unpack_control(struct l2cap_chan *chan, | |
784 | struct sk_buff *skb) | |
785 | { | |
786 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
787 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
788 | &bt_cb(skb)->control); | |
cec8ab6e | 789 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
790 | } else { |
791 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
792 | &bt_cb(skb)->control); | |
cec8ab6e | 793 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
794 | } |
795 | } | |
796 | ||
b5c6aaed MM |
797 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
798 | { | |
799 | u32 packed; | |
800 | ||
801 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
802 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
803 | ||
804 | if (control->sframe) { | |
805 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
806 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
807 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
808 | } else { | |
809 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
810 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
811 | } | |
812 | ||
813 | return packed; | |
814 | } | |
815 | ||
816 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
817 | { | |
818 | u16 packed; | |
819 | ||
820 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
821 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
822 | ||
823 | if (control->sframe) { | |
824 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
825 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
826 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
827 | } else { | |
828 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
829 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
830 | } | |
831 | ||
832 | return packed; | |
833 | } | |
834 | ||
b76bbd66 MM |
835 | static inline void __pack_control(struct l2cap_chan *chan, |
836 | struct l2cap_ctrl *control, | |
837 | struct sk_buff *skb) | |
838 | { | |
839 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
840 | put_unaligned_le32(__pack_extended_control(control), | |
841 | skb->data + L2CAP_HDR_SIZE); | |
842 | } else { | |
843 | put_unaligned_le16(__pack_enhanced_control(control), | |
844 | skb->data + L2CAP_HDR_SIZE); | |
845 | } | |
846 | } | |
847 | ||
ba7aa64f GP |
848 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
849 | { | |
850 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
851 | return L2CAP_EXT_HDR_SIZE; | |
852 | else | |
853 | return L2CAP_ENH_HDR_SIZE; | |
854 | } | |
855 | ||
a67d7f6f MM |
856 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
857 | u32 control) | |
b5c6aaed MM |
858 | { |
859 | struct sk_buff *skb; | |
860 | struct l2cap_hdr *lh; | |
ba7aa64f | 861 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
862 | |
863 | if (chan->fcs == L2CAP_FCS_CRC16) | |
864 | hlen += L2CAP_FCS_SIZE; | |
865 | ||
a67d7f6f | 866 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 867 | |
b5c6aaed | 868 | if (!skb) |
a67d7f6f | 869 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
870 | |
871 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
872 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
873 | lh->cid = cpu_to_le16(chan->dcid); | |
874 | ||
a67d7f6f MM |
875 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
876 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
877 | else | |
878 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
879 | |
880 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 881 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
882 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
883 | } | |
884 | ||
885 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
886 | return skb; |
887 | } | |
888 | ||
889 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
890 | struct l2cap_ctrl *control) | |
891 | { | |
892 | struct sk_buff *skb; | |
893 | u32 control_field; | |
894 | ||
895 | BT_DBG("chan %p, control %p", chan, control); | |
896 | ||
897 | if (!control->sframe) | |
898 | return; | |
899 | ||
900 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
901 | !control->poll) | |
902 | control->final = 1; | |
903 | ||
904 | if (control->super == L2CAP_SUPER_RR) | |
905 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
906 | else if (control->super == L2CAP_SUPER_RNR) | |
907 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
908 | ||
909 | if (control->super != L2CAP_SUPER_SREJ) { | |
910 | chan->last_acked_seq = control->reqseq; | |
911 | __clear_ack_timer(chan); | |
912 | } | |
913 | ||
914 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
915 | control->final, control->poll, control->super); | |
916 | ||
917 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
918 | control_field = __pack_extended_control(control); | |
919 | else | |
920 | control_field = __pack_enhanced_control(control); | |
921 | ||
922 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
923 | if (!IS_ERR(skb)) | |
924 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
925 | } |
926 | ||
c9e3d5e0 | 927 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 928 | { |
c9e3d5e0 MM |
929 | struct l2cap_ctrl control; |
930 | ||
931 | BT_DBG("chan %p, poll %d", chan, poll); | |
932 | ||
933 | memset(&control, 0, sizeof(control)); | |
934 | control.sframe = 1; | |
935 | control.poll = poll; | |
936 | ||
937 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
938 | control.super = L2CAP_SUPER_RNR; | |
939 | else | |
940 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 941 | |
c9e3d5e0 MM |
942 | control.reqseq = chan->buffer_seq; |
943 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
944 | } |
945 | ||
b4450035 | 946 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 947 | { |
c1360a1c | 948 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
949 | } |
950 | ||
93c3e8f5 AE |
951 | static bool __amp_capable(struct l2cap_chan *chan) |
952 | { | |
953 | struct l2cap_conn *conn = chan->conn; | |
954 | ||
955 | if (enable_hs && | |
956 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && | |
957 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
958 | return true; | |
959 | else | |
960 | return false; | |
961 | } | |
962 | ||
2766be48 | 963 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
964 | { |
965 | struct l2cap_conn *conn = chan->conn; | |
966 | struct l2cap_conn_req req; | |
967 | ||
968 | req.scid = cpu_to_le16(chan->scid); | |
969 | req.psm = chan->psm; | |
970 | ||
971 | chan->ident = l2cap_get_ident(conn); | |
972 | ||
973 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
974 | ||
975 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
976 | } | |
977 | ||
9f0caeb1 VCG |
978 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
979 | { | |
2827011f | 980 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
981 | chan->conf_state = 0; |
982 | __clear_chan_timer(chan); | |
983 | ||
54a59aa2 | 984 | chan->state = BT_CONNECTED; |
9f0caeb1 | 985 | |
fd83e2c2 | 986 | chan->ops->ready(chan); |
9f0caeb1 VCG |
987 | } |
988 | ||
93c3e8f5 AE |
989 | static void l2cap_start_connection(struct l2cap_chan *chan) |
990 | { | |
991 | if (__amp_capable(chan)) { | |
992 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
993 | a2mp_discover_amp(chan); | |
994 | } else { | |
995 | l2cap_send_conn_req(chan); | |
996 | } | |
997 | } | |
998 | ||
fc7f8a7e | 999 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1000 | { |
8c1d787b | 1001 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1002 | |
9f0caeb1 VCG |
1003 | if (conn->hcon->type == LE_LINK) { |
1004 | l2cap_chan_ready(chan); | |
1005 | return; | |
1006 | } | |
1007 | ||
79d554a6 | 1008 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1009 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1010 | return; | |
1011 | ||
d45fc423 | 1012 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1013 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1014 | l2cap_start_connection(chan); |
1015 | } | |
79d554a6 MH |
1016 | } else { |
1017 | struct l2cap_info_req req; | |
ac73498c | 1018 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1019 | |
1020 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1021 | conn->info_ident = l2cap_get_ident(conn); | |
1022 | ||
ba13ccd9 | 1023 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1024 | |
2d792818 GP |
1025 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1026 | sizeof(req), &req); | |
79d554a6 MH |
1027 | } |
1028 | } | |
1029 | ||
cf6c2c0b GP |
1030 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1031 | { | |
1032 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1033 | if (!disable_ertm) |
cf6c2c0b GP |
1034 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1035 | ||
1036 | switch (mode) { | |
1037 | case L2CAP_MODE_ERTM: | |
1038 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1039 | case L2CAP_MODE_STREAMING: | |
1040 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1041 | default: | |
1042 | return 0x00; | |
1043 | } | |
1044 | } | |
1045 | ||
2d792818 GP |
1046 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
1047 | struct l2cap_chan *chan, int err) | |
22121fc9 | 1048 | { |
6be36555 | 1049 | struct sock *sk = chan->sk; |
22121fc9 GP |
1050 | struct l2cap_disconn_req req; |
1051 | ||
c13ffa62 GP |
1052 | if (!conn) |
1053 | return; | |
1054 | ||
0c1bc5c6 | 1055 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1056 | __clear_retrans_timer(chan); |
1057 | __clear_monitor_timer(chan); | |
1058 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1059 | } |
1060 | ||
416fa752 | 1061 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1062 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1063 | return; |
1064 | } | |
1065 | ||
fe4128e0 GP |
1066 | req.dcid = cpu_to_le16(chan->dcid); |
1067 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1068 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1069 | sizeof(req), &req); | |
c13ffa62 | 1070 | |
6be36555 | 1071 | lock_sock(sk); |
0e587be7 | 1072 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1073 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1074 | release_sock(sk); |
22121fc9 GP |
1075 | } |
1076 | ||
1da177e4 | 1077 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1078 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1079 | { | |
3df91ea2 | 1080 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1081 | |
1082 | BT_DBG("conn %p", conn); | |
1083 | ||
3df91ea2 | 1084 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1085 | |
3df91ea2 | 1086 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1087 | struct sock *sk = chan->sk; |
baa7e1fa | 1088 | |
6be36555 | 1089 | l2cap_chan_lock(chan); |
4e8402a3 | 1090 | |
715ec005 | 1091 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1092 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1093 | continue; |
1094 | } | |
1095 | ||
89bc500e | 1096 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1097 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1098 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1099 | l2cap_chan_unlock(chan); |
47731de7 GP |
1100 | continue; |
1101 | } | |
79d554a6 | 1102 | |
c1360a1c | 1103 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1104 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1105 | &chan->conf_state)) { |
89bc500e | 1106 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1107 | l2cap_chan_unlock(chan); |
47731de7 | 1108 | continue; |
b1235d79 | 1109 | } |
47731de7 | 1110 | |
93c3e8f5 | 1111 | l2cap_start_connection(chan); |
47731de7 | 1112 | |
89bc500e | 1113 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1114 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1115 | char buf[128]; |
fe4128e0 GP |
1116 | rsp.scid = cpu_to_le16(chan->dcid); |
1117 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1118 | |
d45fc423 | 1119 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1120 | lock_sock(sk); |
c5daa683 GP |
1121 | if (test_bit(BT_SK_DEFER_SETUP, |
1122 | &bt_sk(sk)->flags)) { | |
ac73498c AE |
1123 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1124 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1125 | chan->ops->defer(chan); |
f66dc81f MH |
1126 | |
1127 | } else { | |
0e587be7 | 1128 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1129 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1130 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1131 | } |
6be36555 | 1132 | release_sock(sk); |
79d554a6 | 1133 | } else { |
ac73498c AE |
1134 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1135 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1136 | } |
1137 | ||
fc7f8a7e | 1138 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1139 | sizeof(rsp), &rsp); |
e9aeb2dd | 1140 | |
c1360a1c | 1141 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1142 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1143 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1144 | continue; |
1145 | } | |
1146 | ||
c1360a1c | 1147 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1148 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1149 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1150 | chan->num_conf_req++; |
4e8402a3 MH |
1151 | } |
1152 | ||
6be36555 | 1153 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1154 | } |
1155 | ||
3df91ea2 | 1156 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1157 | } |
1158 | ||
c2287681 | 1159 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1160 | * Returns closest match, locked. |
1161 | */ | |
d9b88702 | 1162 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1163 | bdaddr_t *src, |
1164 | bdaddr_t *dst) | |
b62f328b | 1165 | { |
23691d75 | 1166 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1167 | |
23691d75 | 1168 | read_lock(&chan_list_lock); |
b62f328b | 1169 | |
23691d75 GP |
1170 | list_for_each_entry(c, &chan_list, global_l) { |
1171 | struct sock *sk = c->sk; | |
fe4128e0 | 1172 | |
89bc500e | 1173 | if (state && c->state != state) |
b62f328b VT |
1174 | continue; |
1175 | ||
23691d75 | 1176 | if (c->scid == cid) { |
c2287681 IY |
1177 | int src_match, dst_match; |
1178 | int src_any, dst_any; | |
1179 | ||
b62f328b | 1180 | /* Exact match. */ |
c2287681 IY |
1181 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1182 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1183 | if (src_match && dst_match) { | |
23691d75 GP |
1184 | read_unlock(&chan_list_lock); |
1185 | return c; | |
1186 | } | |
b62f328b VT |
1187 | |
1188 | /* Closest match */ | |
c2287681 IY |
1189 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1190 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1191 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1192 | (src_any && dst_any)) | |
23691d75 | 1193 | c1 = c; |
b62f328b VT |
1194 | } |
1195 | } | |
280f294f | 1196 | |
23691d75 | 1197 | read_unlock(&chan_list_lock); |
b62f328b | 1198 | |
23691d75 | 1199 | return c1; |
b62f328b VT |
1200 | } |
1201 | ||
1202 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1203 | { | |
c916fbe4 | 1204 | struct sock *parent, *sk; |
23691d75 | 1205 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1206 | |
1207 | BT_DBG(""); | |
1208 | ||
1209 | /* Check if we have socket listening on cid */ | |
23691d75 | 1210 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1211 | conn->src, conn->dst); |
23691d75 | 1212 | if (!pchan) |
b62f328b VT |
1213 | return; |
1214 | ||
23691d75 GP |
1215 | parent = pchan->sk; |
1216 | ||
aa2ac881 | 1217 | lock_sock(parent); |
62f3a2cf | 1218 | |
80b98027 | 1219 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1220 | if (!chan) |
b62f328b VT |
1221 | goto clean; |
1222 | ||
80808e43 | 1223 | sk = chan->sk; |
5d41ce1d | 1224 | |
b62f328b | 1225 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1226 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1227 | |
b62f328b VT |
1228 | bacpy(&bt_sk(sk)->src, conn->src); |
1229 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1230 | ||
3d57dc68 | 1231 | l2cap_chan_add(conn, chan); |
48454079 | 1232 | |
6754e0df | 1233 | l2cap_chan_ready(chan); |
b62f328b | 1234 | |
b62f328b | 1235 | clean: |
aa2ac881 | 1236 | release_sock(parent); |
b62f328b VT |
1237 | } |
1238 | ||
4e8402a3 MH |
1239 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1240 | { | |
48454079 | 1241 | struct l2cap_chan *chan; |
cc110922 | 1242 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1243 | |
79d554a6 | 1244 | BT_DBG("conn %p", conn); |
4e8402a3 | 1245 | |
cc110922 | 1246 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1247 | l2cap_le_conn_ready(conn); |
1248 | ||
cc110922 VCG |
1249 | if (hcon->out && hcon->type == LE_LINK) |
1250 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1251 | |
3df91ea2 | 1252 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1253 | |
3df91ea2 | 1254 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1255 | |
6be36555 | 1256 | l2cap_chan_lock(chan); |
4e8402a3 | 1257 | |
416fa752 AE |
1258 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1259 | l2cap_chan_unlock(chan); | |
1260 | continue; | |
1261 | } | |
1262 | ||
cc110922 VCG |
1263 | if (hcon->type == LE_LINK) { |
1264 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1265 | l2cap_chan_ready(chan); |
acd7d370 | 1266 | |
63128451 | 1267 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1268 | struct sock *sk = chan->sk; |
c9b66675 | 1269 | __clear_chan_timer(chan); |
6be36555 | 1270 | lock_sock(sk); |
0e587be7 | 1271 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1272 | sk->sk_state_change(sk); |
6be36555 | 1273 | release_sock(sk); |
b501d6a1 | 1274 | |
89bc500e | 1275 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1276 | l2cap_do_start(chan); |
4e8402a3 | 1277 | |
6be36555 | 1278 | l2cap_chan_unlock(chan); |
4e8402a3 | 1279 | } |
79d554a6 | 1280 | |
3df91ea2 | 1281 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1282 | } |
1283 | ||
1284 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1285 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1286 | { | |
48454079 | 1287 | struct l2cap_chan *chan; |
4e8402a3 MH |
1288 | |
1289 | BT_DBG("conn %p", conn); | |
1290 | ||
3df91ea2 | 1291 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1292 | |
3df91ea2 | 1293 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1294 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1295 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1296 | } |
1297 | ||
3df91ea2 | 1298 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1299 | } |
1300 | ||
f878fcad | 1301 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1302 | { |
f878fcad | 1303 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1304 | info_timer.work); |
4e8402a3 | 1305 | |
984947dc | 1306 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1307 | conn->info_ident = 0; |
984947dc | 1308 | |
4e8402a3 MH |
1309 | l2cap_conn_start(conn); |
1310 | } | |
1311 | ||
5d3de7df VCG |
1312 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1313 | { | |
1314 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1315 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1316 | |
1317 | if (!conn) | |
1318 | return; | |
1319 | ||
1320 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1321 | ||
1322 | kfree_skb(conn->rx_skb); | |
1323 | ||
3df91ea2 AE |
1324 | mutex_lock(&conn->chan_lock); |
1325 | ||
5d3de7df VCG |
1326 | /* Kill channels */ |
1327 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1328 | l2cap_chan_hold(chan); |
6be36555 AE |
1329 | l2cap_chan_lock(chan); |
1330 | ||
5d3de7df | 1331 | l2cap_chan_del(chan, err); |
6be36555 AE |
1332 | |
1333 | l2cap_chan_unlock(chan); | |
1334 | ||
80b98027 | 1335 | chan->ops->close(chan); |
61d6ef3e | 1336 | l2cap_chan_put(chan); |
5d3de7df VCG |
1337 | } |
1338 | ||
3df91ea2 AE |
1339 | mutex_unlock(&conn->chan_lock); |
1340 | ||
73d80deb LAD |
1341 | hci_chan_del(conn->hchan); |
1342 | ||
5d3de7df | 1343 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1344 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1345 | |
51a8efd7 | 1346 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1347 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1348 | smp_chan_destroy(conn); |
d26a2345 | 1349 | } |
5d3de7df VCG |
1350 | |
1351 | hcon->l2cap_data = NULL; | |
1352 | kfree(conn); | |
1353 | } | |
1354 | ||
6c9d42a1 | 1355 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1356 | { |
6c9d42a1 | 1357 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1358 | security_timer.work); |
5d3de7df | 1359 | |
d06cc416 JH |
1360 | BT_DBG("conn %p", conn); |
1361 | ||
1362 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1363 | smp_chan_destroy(conn); | |
1364 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1365 | } | |
5d3de7df VCG |
1366 | } |
1367 | ||
1da177e4 LT |
1368 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1369 | { | |
0139418c | 1370 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1371 | struct hci_chan *hchan; |
1da177e4 | 1372 | |
0139418c | 1373 | if (conn || status) |
1da177e4 LT |
1374 | return conn; |
1375 | ||
73d80deb LAD |
1376 | hchan = hci_chan_create(hcon); |
1377 | if (!hchan) | |
1378 | return NULL; | |
1379 | ||
8bcde1f2 | 1380 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1381 | if (!conn) { |
1382 | hci_chan_del(hchan); | |
1da177e4 | 1383 | return NULL; |
73d80deb | 1384 | } |
1da177e4 LT |
1385 | |
1386 | hcon->l2cap_data = conn; | |
1387 | conn->hcon = hcon; | |
73d80deb | 1388 | conn->hchan = hchan; |
1da177e4 | 1389 | |
73d80deb | 1390 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1391 | |
dcc042d5 AE |
1392 | switch (hcon->type) { |
1393 | case AMP_LINK: | |
1394 | conn->mtu = hcon->hdev->block_mtu; | |
1395 | break; | |
1396 | ||
1397 | case LE_LINK: | |
1398 | if (hcon->hdev->le_mtu) { | |
1399 | conn->mtu = hcon->hdev->le_mtu; | |
1400 | break; | |
1401 | } | |
1402 | /* fall through */ | |
1403 | ||
1404 | default: | |
acd7d370 | 1405 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1406 | break; |
1407 | } | |
acd7d370 | 1408 | |
1da177e4 LT |
1409 | conn->src = &hcon->hdev->bdaddr; |
1410 | conn->dst = &hcon->dst; | |
1411 | ||
4e8402a3 MH |
1412 | conn->feat_mask = 0; |
1413 | ||
1da177e4 | 1414 | spin_lock_init(&conn->lock); |
3df91ea2 | 1415 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1416 | |
1417 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1418 | |
5d3de7df | 1419 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1420 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1421 | else |
030013d8 | 1422 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1423 | |
9f5a0d7b | 1424 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1425 | |
1da177e4 LT |
1426 | return conn; |
1427 | } | |
1428 | ||
1da177e4 | 1429 | /* ---- Socket interface ---- */ |
1da177e4 | 1430 | |
c2287681 | 1431 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1432 | * Returns closest match. |
1433 | */ | |
c2287681 IY |
1434 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1435 | bdaddr_t *src, | |
1436 | bdaddr_t *dst) | |
1da177e4 | 1437 | { |
23691d75 | 1438 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1439 | |
23691d75 | 1440 | read_lock(&chan_list_lock); |
e0f0cb56 | 1441 | |
23691d75 GP |
1442 | list_for_each_entry(c, &chan_list, global_l) { |
1443 | struct sock *sk = c->sk; | |
fe4128e0 | 1444 | |
89bc500e | 1445 | if (state && c->state != state) |
1da177e4 LT |
1446 | continue; |
1447 | ||
23691d75 | 1448 | if (c->psm == psm) { |
c2287681 IY |
1449 | int src_match, dst_match; |
1450 | int src_any, dst_any; | |
1451 | ||
1da177e4 | 1452 | /* Exact match. */ |
c2287681 IY |
1453 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1454 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1455 | if (src_match && dst_match) { | |
a7567b20 | 1456 | read_unlock(&chan_list_lock); |
23691d75 GP |
1457 | return c; |
1458 | } | |
1da177e4 LT |
1459 | |
1460 | /* Closest match */ | |
c2287681 IY |
1461 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1462 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1463 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1464 | (src_any && dst_any)) | |
23691d75 | 1465 | c1 = c; |
1da177e4 LT |
1466 | } |
1467 | } | |
1da177e4 | 1468 | |
23691d75 | 1469 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1470 | |
23691d75 | 1471 | return c1; |
1da177e4 LT |
1472 | } |
1473 | ||
8e9f9892 AG |
1474 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1475 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1476 | { |
5d41ce1d | 1477 | struct sock *sk = chan->sk; |
1da177e4 | 1478 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1479 | struct l2cap_conn *conn; |
1480 | struct hci_conn *hcon; | |
1481 | struct hci_dev *hdev; | |
09ab6f4c | 1482 | __u8 auth_type; |
44d0e48e | 1483 | int err; |
1da177e4 | 1484 | |
6ed93dc6 | 1485 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1486 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1487 | |
af05b30b GP |
1488 | hdev = hci_get_route(dst, src); |
1489 | if (!hdev) | |
1da177e4 LT |
1490 | return -EHOSTUNREACH; |
1491 | ||
09fd0de5 | 1492 | hci_dev_lock(hdev); |
1da177e4 | 1493 | |
6be36555 | 1494 | l2cap_chan_lock(chan); |
03a00194 GP |
1495 | |
1496 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1497 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1498 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1499 | err = -EINVAL; |
1500 | goto done; | |
1501 | } | |
1502 | ||
1503 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1504 | err = -EINVAL; | |
1505 | goto done; | |
1506 | } | |
1507 | ||
1508 | switch (chan->mode) { | |
1509 | case L2CAP_MODE_BASIC: | |
1510 | break; | |
1511 | case L2CAP_MODE_ERTM: | |
1512 | case L2CAP_MODE_STREAMING: | |
1513 | if (!disable_ertm) | |
1514 | break; | |
1515 | /* fall through */ | |
1516 | default: | |
1517 | err = -ENOTSUPP; | |
1518 | goto done; | |
1519 | } | |
1520 | ||
0797e01d | 1521 | switch (chan->state) { |
03a00194 GP |
1522 | case BT_CONNECT: |
1523 | case BT_CONNECT2: | |
1524 | case BT_CONFIG: | |
1525 | /* Already connecting */ | |
1526 | err = 0; | |
1527 | goto done; | |
1528 | ||
1529 | case BT_CONNECTED: | |
1530 | /* Already connected */ | |
1531 | err = -EISCONN; | |
1532 | goto done; | |
1533 | ||
1534 | case BT_OPEN: | |
1535 | case BT_BOUND: | |
1536 | /* Can connect */ | |
1537 | break; | |
1538 | ||
1539 | default: | |
1540 | err = -EBADFD; | |
1541 | goto done; | |
1542 | } | |
1543 | ||
1544 | /* Set destination address and psm */ | |
0797e01d | 1545 | lock_sock(sk); |
9219b2a0 | 1546 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1547 | release_sock(sk); |
1548 | ||
03a00194 GP |
1549 | chan->psm = psm; |
1550 | chan->dcid = cid; | |
1da177e4 | 1551 | |
4343478f | 1552 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1553 | |
fe4128e0 | 1554 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1555 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1556 | chan->sec_level, auth_type); |
acd7d370 | 1557 | else |
8e9f9892 | 1558 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1559 | chan->sec_level, auth_type); |
acd7d370 | 1560 | |
30e76272 VT |
1561 | if (IS_ERR(hcon)) { |
1562 | err = PTR_ERR(hcon); | |
1da177e4 | 1563 | goto done; |
30e76272 | 1564 | } |
1da177e4 LT |
1565 | |
1566 | conn = l2cap_conn_add(hcon, 0); | |
1567 | if (!conn) { | |
1568 | hci_conn_put(hcon); | |
30e76272 | 1569 | err = -ENOMEM; |
1da177e4 LT |
1570 | goto done; |
1571 | } | |
1572 | ||
9f0caeb1 VCG |
1573 | if (hcon->type == LE_LINK) { |
1574 | err = 0; | |
1575 | ||
1576 | if (!list_empty(&conn->chan_l)) { | |
1577 | err = -EBUSY; | |
1578 | hci_conn_put(hcon); | |
1579 | } | |
1580 | ||
1581 | if (err) | |
1582 | goto done; | |
1583 | } | |
1584 | ||
1da177e4 LT |
1585 | /* Update source addr of the socket */ |
1586 | bacpy(src, conn->src); | |
1587 | ||
6be36555 | 1588 | l2cap_chan_unlock(chan); |
48454079 | 1589 | l2cap_chan_add(conn, chan); |
6be36555 | 1590 | l2cap_chan_lock(chan); |
48454079 | 1591 | |
6be36555 | 1592 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1593 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1594 | |
1595 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1596 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1597 | __clear_chan_timer(chan); |
d45fc423 | 1598 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1599 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1600 | } else |
fc7f8a7e | 1601 | l2cap_do_start(chan); |
1da177e4 LT |
1602 | } |
1603 | ||
30e76272 VT |
1604 | err = 0; |
1605 | ||
1da177e4 | 1606 | done: |
6be36555 | 1607 | l2cap_chan_unlock(chan); |
09fd0de5 | 1608 | hci_dev_unlock(hdev); |
1da177e4 LT |
1609 | hci_dev_put(hdev); |
1610 | return err; | |
1611 | } | |
1612 | ||
dcba0dba | 1613 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1614 | { |
8c1d787b | 1615 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1616 | DECLARE_WAITQUEUE(wait, current); |
1617 | int err = 0; | |
1618 | int timeo = HZ/5; | |
1619 | ||
2b0b05dd | 1620 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1621 | set_current_state(TASK_INTERRUPTIBLE); |
1622 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1623 | if (!timeo) |
1624 | timeo = HZ/5; | |
1625 | ||
1626 | if (signal_pending(current)) { | |
1627 | err = sock_intr_errno(timeo); | |
1628 | break; | |
1629 | } | |
1630 | ||
1631 | release_sock(sk); | |
1632 | timeo = schedule_timeout(timeo); | |
1633 | lock_sock(sk); | |
a71a0cf4 | 1634 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1635 | |
1636 | err = sock_error(sk); | |
1637 | if (err) | |
1638 | break; | |
1639 | } | |
1640 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1641 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1642 | return err; |
1643 | } | |
1644 | ||
721c4181 | 1645 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1646 | { |
721c4181 | 1647 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1648 | monitor_timer.work); |
e90bac06 | 1649 | |
525cd185 | 1650 | BT_DBG("chan %p", chan); |
0e98958d | 1651 | |
6be36555 AE |
1652 | l2cap_chan_lock(chan); |
1653 | ||
80909e04 | 1654 | if (!chan->conn) { |
6be36555 | 1655 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1656 | l2cap_chan_put(chan); |
e90bac06 GP |
1657 | return; |
1658 | } | |
1659 | ||
401bb1f7 | 1660 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1661 | |
6be36555 | 1662 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1663 | l2cap_chan_put(chan); |
e90bac06 GP |
1664 | } |
1665 | ||
721c4181 | 1666 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1667 | { |
721c4181 | 1668 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1669 | retrans_timer.work); |
e90bac06 | 1670 | |
49208c9c | 1671 | BT_DBG("chan %p", chan); |
0e98958d | 1672 | |
6be36555 AE |
1673 | l2cap_chan_lock(chan); |
1674 | ||
80909e04 MM |
1675 | if (!chan->conn) { |
1676 | l2cap_chan_unlock(chan); | |
1677 | l2cap_chan_put(chan); | |
1678 | return; | |
1679 | } | |
6be36555 | 1680 | |
401bb1f7 | 1681 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1682 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1683 | l2cap_chan_put(chan); |
e90bac06 GP |
1684 | } |
1685 | ||
d660366d GP |
1686 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1687 | struct sk_buff_head *skbs) | |
6840ed07 | 1688 | { |
ccbb84af | 1689 | struct sk_buff *skb; |
3733937d | 1690 | struct l2cap_ctrl *control; |
6840ed07 | 1691 | |
3733937d MM |
1692 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1693 | ||
3733937d MM |
1694 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1695 | ||
1696 | while (!skb_queue_empty(&chan->tx_q)) { | |
1697 | ||
1698 | skb = skb_dequeue(&chan->tx_q); | |
1699 | ||
1700 | bt_cb(skb)->control.retries = 1; | |
1701 | control = &bt_cb(skb)->control; | |
1702 | ||
1703 | control->reqseq = 0; | |
1704 | control->txseq = chan->next_tx_seq; | |
1705 | ||
1706 | __pack_control(chan, control, skb); | |
6840ed07 | 1707 | |
47d1ec61 | 1708 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1709 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1710 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1711 | } |
1712 | ||
4343478f | 1713 | l2cap_do_send(chan, skb); |
6840ed07 | 1714 | |
b4400672 | 1715 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1716 | |
836be934 | 1717 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1718 | chan->frames_sent++; |
6840ed07 | 1719 | } |
6840ed07 GP |
1720 | } |
1721 | ||
67c9e840 | 1722 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1723 | { |
1724 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1725 | struct l2cap_ctrl *control; |
1726 | int sent = 0; | |
1727 | ||
1728 | BT_DBG("chan %p", chan); | |
1c2acffb | 1729 | |
89bc500e | 1730 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1731 | return -ENOTCONN; |
e90bac06 | 1732 | |
94122bbe MM |
1733 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1734 | return 0; | |
1735 | ||
18a48e76 MM |
1736 | while (chan->tx_send_head && |
1737 | chan->unacked_frames < chan->remote_tx_win && | |
1738 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1739 | |
18a48e76 | 1740 | skb = chan->tx_send_head; |
e90bac06 | 1741 | |
18a48e76 MM |
1742 | bt_cb(skb)->control.retries = 1; |
1743 | control = &bt_cb(skb)->control; | |
95ffa978 | 1744 | |
e2ab4353 | 1745 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1746 | control->final = 1; |
e2ab4353 | 1747 | |
18a48e76 MM |
1748 | control->reqseq = chan->buffer_seq; |
1749 | chan->last_acked_seq = chan->buffer_seq; | |
1750 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1751 | |
18a48e76 | 1752 | __pack_control(chan, control, skb); |
e90bac06 | 1753 | |
47d1ec61 | 1754 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1755 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1756 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1757 | } |
1758 | ||
18a48e76 MM |
1759 | /* Clone after data has been modified. Data is assumed to be |
1760 | read-only (for locking purposes) on cloned sk_buffs. | |
1761 | */ | |
1762 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1763 | |
18a48e76 MM |
1764 | if (!tx_skb) |
1765 | break; | |
1c2acffb | 1766 | |
18a48e76 | 1767 | __set_retrans_timer(chan); |
836be934 AE |
1768 | |
1769 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1770 | chan->unacked_frames++; |
6a026610 | 1771 | chan->frames_sent++; |
18a48e76 | 1772 | sent++; |
1c2acffb | 1773 | |
58d35f87 GP |
1774 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1775 | chan->tx_send_head = NULL; | |
1c2acffb | 1776 | else |
58d35f87 | 1777 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1778 | |
1779 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1780 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1781 | } |
1782 | ||
b4400672 AE |
1783 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1784 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1785 | |
1786 | return sent; | |
9e917af1 GP |
1787 | } |
1788 | ||
e1fbd4c1 MM |
1789 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1790 | { | |
1791 | struct l2cap_ctrl control; | |
1792 | struct sk_buff *skb; | |
1793 | struct sk_buff *tx_skb; | |
1794 | u16 seq; | |
1795 | ||
1796 | BT_DBG("chan %p", chan); | |
1797 | ||
1798 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1799 | return; | |
1800 | ||
1801 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1802 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1803 | ||
1804 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1805 | if (!skb) { | |
1806 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1807 | seq); |
e1fbd4c1 MM |
1808 | continue; |
1809 | } | |
1810 | ||
1811 | bt_cb(skb)->control.retries++; | |
1812 | control = bt_cb(skb)->control; | |
1813 | ||
1814 | if (chan->max_tx != 0 && | |
1815 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1816 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1817 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1818 | l2cap_seq_list_clear(&chan->retrans_list); | |
1819 | break; | |
1820 | } | |
1821 | ||
1822 | control.reqseq = chan->buffer_seq; | |
1823 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1824 | control.final = 1; | |
1825 | else | |
1826 | control.final = 0; | |
1827 | ||
1828 | if (skb_cloned(skb)) { | |
1829 | /* Cloned sk_buffs are read-only, so we need a | |
1830 | * writeable copy | |
1831 | */ | |
8bcde1f2 | 1832 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1833 | } else { |
8bcde1f2 | 1834 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1835 | } |
1836 | ||
1837 | if (!tx_skb) { | |
1838 | l2cap_seq_list_clear(&chan->retrans_list); | |
1839 | break; | |
1840 | } | |
1841 | ||
1842 | /* Update skb contents */ | |
1843 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1844 | put_unaligned_le32(__pack_extended_control(&control), | |
1845 | tx_skb->data + L2CAP_HDR_SIZE); | |
1846 | } else { | |
1847 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1848 | tx_skb->data + L2CAP_HDR_SIZE); | |
1849 | } | |
1850 | ||
1851 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1852 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1853 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1854 | L2CAP_FCS_SIZE)); | |
1855 | } | |
1856 | ||
1857 | l2cap_do_send(chan, tx_skb); | |
1858 | ||
1859 | BT_DBG("Resent txseq %d", control.txseq); | |
1860 | ||
1861 | chan->last_acked_seq = chan->buffer_seq; | |
1862 | } | |
1863 | } | |
1864 | ||
f80842a8 MM |
1865 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1866 | struct l2cap_ctrl *control) | |
1867 | { | |
1868 | BT_DBG("chan %p, control %p", chan, control); | |
1869 | ||
1870 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1871 | l2cap_ertm_resend(chan); | |
1872 | } | |
1873 | ||
d2a7ac5d MM |
1874 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1875 | struct l2cap_ctrl *control) | |
1876 | { | |
e1fbd4c1 MM |
1877 | struct sk_buff *skb; |
1878 | ||
1879 | BT_DBG("chan %p, control %p", chan, control); | |
1880 | ||
1881 | if (control->poll) | |
1882 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1883 | ||
1884 | l2cap_seq_list_clear(&chan->retrans_list); | |
1885 | ||
1886 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1887 | return; | |
1888 | ||
1889 | if (chan->unacked_frames) { | |
1890 | skb_queue_walk(&chan->tx_q, skb) { | |
1891 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 1892 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
1893 | break; |
1894 | } | |
1895 | ||
1896 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1897 | if (skb == chan->tx_send_head) | |
1898 | break; | |
1899 | ||
1900 | l2cap_seq_list_append(&chan->retrans_list, | |
1901 | bt_cb(skb)->control.txseq); | |
1902 | } | |
1903 | ||
1904 | l2cap_ertm_resend(chan); | |
1905 | } | |
d2a7ac5d MM |
1906 | } |
1907 | ||
0a0aba42 | 1908 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1909 | { |
0a0aba42 MM |
1910 | struct l2cap_ctrl control; |
1911 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1912 | chan->last_acked_seq); | |
1913 | int threshold; | |
9e917af1 | 1914 | |
0a0aba42 MM |
1915 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1916 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1917 | |
0a0aba42 MM |
1918 | memset(&control, 0, sizeof(control)); |
1919 | control.sframe = 1; | |
dfc909be | 1920 | |
0a0aba42 MM |
1921 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1922 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1923 | __clear_ack_timer(chan); | |
1924 | control.super = L2CAP_SUPER_RNR; | |
1925 | control.reqseq = chan->buffer_seq; | |
1926 | l2cap_send_sframe(chan, &control); | |
1927 | } else { | |
1928 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1929 | l2cap_ertm_send(chan); | |
1930 | /* If any i-frames were sent, they included an ack */ | |
1931 | if (chan->buffer_seq == chan->last_acked_seq) | |
1932 | frames_to_ack = 0; | |
1933 | } | |
dfc909be | 1934 | |
c20f8e35 | 1935 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
1936 | * Calculate without mul or div |
1937 | */ | |
c20f8e35 | 1938 | threshold = chan->ack_win; |
0a0aba42 MM |
1939 | threshold += threshold << 1; |
1940 | threshold >>= 2; | |
1941 | ||
b4400672 | 1942 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1943 | threshold); |
1944 | ||
1945 | if (frames_to_ack >= threshold) { | |
1946 | __clear_ack_timer(chan); | |
1947 | control.super = L2CAP_SUPER_RR; | |
1948 | control.reqseq = chan->buffer_seq; | |
1949 | l2cap_send_sframe(chan, &control); | |
1950 | frames_to_ack = 0; | |
1951 | } | |
1c2acffb | 1952 | |
0a0aba42 MM |
1953 | if (frames_to_ack) |
1954 | __set_ack_timer(chan); | |
1955 | } | |
b17e73bb SJ |
1956 | } |
1957 | ||
04124681 GP |
1958 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1959 | struct msghdr *msg, int len, | |
1960 | int count, struct sk_buff *skb) | |
1c2acffb | 1961 | { |
0952a57a | 1962 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1963 | struct sk_buff **frag; |
90338947 | 1964 | int sent = 0; |
1da177e4 | 1965 | |
59203a21 | 1966 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1967 | return -EFAULT; |
1da177e4 LT |
1968 | |
1969 | sent += count; | |
1970 | len -= count; | |
1971 | ||
1972 | /* Continuation fragments (no L2CAP header) */ | |
1973 | frag = &skb_shinfo(skb)->frag_list; | |
1974 | while (len) { | |
fbe00700 GP |
1975 | struct sk_buff *tmp; |
1976 | ||
1da177e4 LT |
1977 | count = min_t(unsigned int, conn->mtu, len); |
1978 | ||
fbe00700 GP |
1979 | tmp = chan->ops->alloc_skb(chan, count, |
1980 | msg->msg_flags & MSG_DONTWAIT); | |
1981 | if (IS_ERR(tmp)) | |
1982 | return PTR_ERR(tmp); | |
1983 | ||
1984 | *frag = tmp; | |
2f7719ce | 1985 | |
1c2acffb GP |
1986 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1987 | return -EFAULT; | |
1da177e4 | 1988 | |
5e59b791 LAD |
1989 | (*frag)->priority = skb->priority; |
1990 | ||
1da177e4 LT |
1991 | sent += count; |
1992 | len -= count; | |
1993 | ||
2d0ed3d5 GP |
1994 | skb->len += (*frag)->len; |
1995 | skb->data_len += (*frag)->len; | |
1996 | ||
1da177e4 LT |
1997 | frag = &(*frag)->next; |
1998 | } | |
1da177e4 LT |
1999 | |
2000 | return sent; | |
1c2acffb | 2001 | } |
1da177e4 | 2002 | |
5e59b791 | 2003 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2004 | struct msghdr *msg, size_t len, |
2005 | u32 priority) | |
1c2acffb | 2006 | { |
8c1d787b | 2007 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2008 | struct sk_buff *skb; |
03a51213 | 2009 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2010 | struct l2cap_hdr *lh; |
2011 | ||
b4400672 | 2012 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2013 | |
2014 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2015 | |
2016 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2017 | msg->msg_flags & MSG_DONTWAIT); |
2018 | if (IS_ERR(skb)) | |
2019 | return skb; | |
1c2acffb | 2020 | |
5e59b791 LAD |
2021 | skb->priority = priority; |
2022 | ||
1c2acffb GP |
2023 | /* Create L2CAP header */ |
2024 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2025 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2026 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2027 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2028 | |
0952a57a | 2029 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2030 | if (unlikely(err < 0)) { |
2031 | kfree_skb(skb); | |
2032 | return ERR_PTR(err); | |
2033 | } | |
2034 | return skb; | |
2035 | } | |
2036 | ||
5e59b791 | 2037 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2038 | struct msghdr *msg, size_t len, |
2039 | u32 priority) | |
1c2acffb | 2040 | { |
8c1d787b | 2041 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2042 | struct sk_buff *skb; |
f2ba7fae | 2043 | int err, count; |
1c2acffb GP |
2044 | struct l2cap_hdr *lh; |
2045 | ||
b4400672 | 2046 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2047 | |
f2ba7fae | 2048 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2049 | |
f2ba7fae | 2050 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2051 | msg->msg_flags & MSG_DONTWAIT); |
2052 | if (IS_ERR(skb)) | |
2053 | return skb; | |
1c2acffb | 2054 | |
5e59b791 LAD |
2055 | skb->priority = priority; |
2056 | ||
1c2acffb GP |
2057 | /* Create L2CAP header */ |
2058 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2059 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2060 | lh->len = cpu_to_le16(len); |
1c2acffb | 2061 | |
0952a57a | 2062 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2063 | if (unlikely(err < 0)) { |
2064 | kfree_skb(skb); | |
2065 | return ERR_PTR(err); | |
2066 | } | |
2067 | return skb; | |
2068 | } | |
2069 | ||
ab0ff76d | 2070 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2071 | struct msghdr *msg, size_t len, |
2072 | u16 sdulen) | |
1c2acffb | 2073 | { |
8c1d787b | 2074 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2075 | struct sk_buff *skb; |
e4ca6d98 | 2076 | int err, count, hlen; |
1c2acffb GP |
2077 | struct l2cap_hdr *lh; |
2078 | ||
b4400672 | 2079 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2080 | |
0ee0d208 GP |
2081 | if (!conn) |
2082 | return ERR_PTR(-ENOTCONN); | |
2083 | ||
ba7aa64f | 2084 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2085 | |
c74e560c | 2086 | if (sdulen) |
03a51213 | 2087 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2088 | |
47d1ec61 | 2089 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2090 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2091 | |
1c2acffb | 2092 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2093 | |
2094 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2095 | msg->msg_flags & MSG_DONTWAIT); |
2096 | if (IS_ERR(skb)) | |
2097 | return skb; | |
1c2acffb GP |
2098 | |
2099 | /* Create L2CAP header */ | |
2100 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2101 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2102 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2103 | |
18a48e76 MM |
2104 | /* Control header is populated later */ |
2105 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2106 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2107 | else | |
2108 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2109 | |
c74e560c | 2110 | if (sdulen) |
03a51213 | 2111 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2112 | |
0952a57a | 2113 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2114 | if (unlikely(err < 0)) { |
2115 | kfree_skb(skb); | |
2116 | return ERR_PTR(err); | |
2117 | } | |
e90bac06 | 2118 | |
18a48e76 | 2119 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2120 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2121 | return skb; |
1da177e4 LT |
2122 | } |
2123 | ||
94122bbe MM |
2124 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2125 | struct sk_buff_head *seg_queue, | |
2126 | struct msghdr *msg, size_t len) | |
c74e560c | 2127 | { |
c74e560c | 2128 | struct sk_buff *skb; |
94122bbe MM |
2129 | u16 sdu_len; |
2130 | size_t pdu_len; | |
94122bbe | 2131 | u8 sar; |
c74e560c | 2132 | |
b4400672 | 2133 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2134 | |
94122bbe MM |
2135 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2136 | * so fragmented skbs are not used. The HCI layer's handling | |
2137 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2138 | */ | |
c74e560c | 2139 | |
94122bbe MM |
2140 | /* PDU size is derived from the HCI MTU */ |
2141 | pdu_len = chan->conn->mtu; | |
c74e560c | 2142 | |
94122bbe MM |
2143 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2144 | ||
2145 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2146 | if (chan->fcs) |
2147 | pdu_len -= L2CAP_FCS_SIZE; | |
2148 | ||
ba7aa64f | 2149 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2150 | |
2151 | /* Remote device may have requested smaller PDUs */ | |
2152 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2153 | ||
2154 | if (len <= pdu_len) { | |
2155 | sar = L2CAP_SAR_UNSEGMENTED; | |
2156 | sdu_len = 0; | |
2157 | pdu_len = len; | |
2158 | } else { | |
2159 | sar = L2CAP_SAR_START; | |
2160 | sdu_len = len; | |
2161 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2162 | } | |
2163 | ||
2164 | while (len > 0) { | |
2165 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2166 | |
c74e560c | 2167 | if (IS_ERR(skb)) { |
94122bbe | 2168 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2169 | return PTR_ERR(skb); |
2170 | } | |
2171 | ||
94122bbe MM |
2172 | bt_cb(skb)->control.sar = sar; |
2173 | __skb_queue_tail(seg_queue, skb); | |
2174 | ||
2175 | len -= pdu_len; | |
2176 | if (sdu_len) { | |
2177 | sdu_len = 0; | |
2178 | pdu_len += L2CAP_SDULEN_SIZE; | |
2179 | } | |
2180 | ||
2181 | if (len <= pdu_len) { | |
2182 | sar = L2CAP_SAR_END; | |
2183 | pdu_len = len; | |
2184 | } else { | |
2185 | sar = L2CAP_SAR_CONTINUE; | |
2186 | } | |
c74e560c | 2187 | } |
c74e560c | 2188 | |
f0f62799 | 2189 | return 0; |
c74e560c GP |
2190 | } |
2191 | ||
5e59b791 | 2192 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2193 | u32 priority) |
9a91a04a | 2194 | { |
9a91a04a | 2195 | struct sk_buff *skb; |
9a91a04a | 2196 | int err; |
94122bbe | 2197 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2198 | |
2199 | /* Connectionless channel */ | |
715ec005 | 2200 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2201 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2202 | if (IS_ERR(skb)) |
2203 | return PTR_ERR(skb); | |
2204 | ||
2205 | l2cap_do_send(chan, skb); | |
2206 | return len; | |
2207 | } | |
2208 | ||
2209 | switch (chan->mode) { | |
2210 | case L2CAP_MODE_BASIC: | |
2211 | /* Check outgoing MTU */ | |
2212 | if (len > chan->omtu) | |
2213 | return -EMSGSIZE; | |
2214 | ||
2215 | /* Create a basic PDU */ | |
5e59b791 | 2216 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2217 | if (IS_ERR(skb)) |
2218 | return PTR_ERR(skb); | |
2219 | ||
2220 | l2cap_do_send(chan, skb); | |
2221 | err = len; | |
2222 | break; | |
2223 | ||
2224 | case L2CAP_MODE_ERTM: | |
2225 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2226 | /* Check outgoing MTU */ |
2227 | if (len > chan->omtu) { | |
2228 | err = -EMSGSIZE; | |
2229 | break; | |
2230 | } | |
9a91a04a | 2231 | |
94122bbe | 2232 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2233 | |
94122bbe MM |
2234 | /* Do segmentation before calling in to the state machine, |
2235 | * since it's possible to block while waiting for memory | |
2236 | * allocation. | |
2237 | */ | |
2238 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2239 | |
94122bbe MM |
2240 | /* The channel could have been closed while segmenting, |
2241 | * check that it is still connected. | |
2242 | */ | |
2243 | if (chan->state != BT_CONNECTED) { | |
2244 | __skb_queue_purge(&seg_queue); | |
2245 | err = -ENOTCONN; | |
9a91a04a GP |
2246 | } |
2247 | ||
94122bbe | 2248 | if (err) |
9a91a04a | 2249 | break; |
9a91a04a | 2250 | |
3733937d | 2251 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2252 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2253 | else |
d660366d | 2254 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2255 | |
d660366d | 2256 | err = len; |
9a91a04a | 2257 | |
94122bbe MM |
2258 | /* If the skbs were not queued for sending, they'll still be in |
2259 | * seg_queue and need to be purged. | |
2260 | */ | |
2261 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2262 | break; |
2263 | ||
2264 | default: | |
2265 | BT_DBG("bad state %1.1x", chan->mode); | |
2266 | err = -EBADFD; | |
2267 | } | |
2268 | ||
2269 | return err; | |
2270 | } | |
2271 | ||
d2a7ac5d MM |
2272 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2273 | { | |
bed68bde MM |
2274 | struct l2cap_ctrl control; |
2275 | u16 seq; | |
2276 | ||
b4400672 | 2277 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2278 | |
2279 | memset(&control, 0, sizeof(control)); | |
2280 | control.sframe = 1; | |
2281 | control.super = L2CAP_SUPER_SREJ; | |
2282 | ||
2283 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2284 | seq = __next_seq(chan, seq)) { | |
2285 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2286 | control.reqseq = seq; | |
2287 | l2cap_send_sframe(chan, &control); | |
2288 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2289 | } | |
2290 | } | |
2291 | ||
2292 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2293 | } |
2294 | ||
2295 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2296 | { | |
bed68bde MM |
2297 | struct l2cap_ctrl control; |
2298 | ||
2299 | BT_DBG("chan %p", chan); | |
2300 | ||
2301 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2302 | return; | |
2303 | ||
2304 | memset(&control, 0, sizeof(control)); | |
2305 | control.sframe = 1; | |
2306 | control.super = L2CAP_SUPER_SREJ; | |
2307 | control.reqseq = chan->srej_list.tail; | |
2308 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2309 | } |
2310 | ||
2311 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2312 | { | |
bed68bde MM |
2313 | struct l2cap_ctrl control; |
2314 | u16 initial_head; | |
2315 | u16 seq; | |
2316 | ||
b4400672 | 2317 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2318 | |
2319 | memset(&control, 0, sizeof(control)); | |
2320 | control.sframe = 1; | |
2321 | control.super = L2CAP_SUPER_SREJ; | |
2322 | ||
2323 | /* Capture initial list head to allow only one pass through the list. */ | |
2324 | initial_head = chan->srej_list.head; | |
2325 | ||
2326 | do { | |
2327 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2328 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2329 | break; | |
2330 | ||
2331 | control.reqseq = seq; | |
2332 | l2cap_send_sframe(chan, &control); | |
2333 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2334 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2335 | } |
2336 | ||
608bcc6d MM |
2337 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2338 | { | |
2339 | struct sk_buff *acked_skb; | |
2340 | u16 ackseq; | |
2341 | ||
b4400672 | 2342 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2343 | |
2344 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2345 | return; | |
2346 | ||
b4400672 | 2347 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2348 | chan->expected_ack_seq, chan->unacked_frames); |
2349 | ||
2350 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2351 | ackseq = __next_seq(chan, ackseq)) { | |
2352 | ||
2353 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2354 | if (acked_skb) { | |
2355 | skb_unlink(acked_skb, &chan->tx_q); | |
2356 | kfree_skb(acked_skb); | |
2357 | chan->unacked_frames--; | |
2358 | } | |
2359 | } | |
2360 | ||
2361 | chan->expected_ack_seq = reqseq; | |
2362 | ||
2363 | if (chan->unacked_frames == 0) | |
2364 | __clear_retrans_timer(chan); | |
2365 | ||
b4400672 | 2366 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2367 | } |
2368 | ||
2369 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2370 | { | |
2371 | BT_DBG("chan %p", chan); | |
2372 | ||
2373 | chan->expected_tx_seq = chan->buffer_seq; | |
2374 | l2cap_seq_list_clear(&chan->srej_list); | |
2375 | skb_queue_purge(&chan->srej_q); | |
2376 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2377 | } | |
2378 | ||
d660366d GP |
2379 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2380 | struct l2cap_ctrl *control, | |
2381 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2382 | { |
608bcc6d MM |
2383 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2384 | event); | |
2385 | ||
2386 | switch (event) { | |
2387 | case L2CAP_EV_DATA_REQUEST: | |
2388 | if (chan->tx_send_head == NULL) | |
2389 | chan->tx_send_head = skb_peek(skbs); | |
2390 | ||
2391 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2392 | l2cap_ertm_send(chan); | |
2393 | break; | |
2394 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2395 | BT_DBG("Enter LOCAL_BUSY"); | |
2396 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2397 | ||
2398 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2399 | /* The SREJ_SENT state must be aborted if we are to | |
2400 | * enter the LOCAL_BUSY state. | |
2401 | */ | |
2402 | l2cap_abort_rx_srej_sent(chan); | |
2403 | } | |
2404 | ||
2405 | l2cap_send_ack(chan); | |
2406 | ||
2407 | break; | |
2408 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2409 | BT_DBG("Exit LOCAL_BUSY"); | |
2410 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2411 | ||
2412 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2413 | struct l2cap_ctrl local_control; | |
2414 | ||
2415 | memset(&local_control, 0, sizeof(local_control)); | |
2416 | local_control.sframe = 1; | |
2417 | local_control.super = L2CAP_SUPER_RR; | |
2418 | local_control.poll = 1; | |
2419 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2420 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2421 | |
2422 | chan->retry_count = 1; | |
2423 | __set_monitor_timer(chan); | |
2424 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2425 | } | |
2426 | break; | |
2427 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2428 | l2cap_process_reqseq(chan, control->reqseq); | |
2429 | break; | |
2430 | case L2CAP_EV_EXPLICIT_POLL: | |
2431 | l2cap_send_rr_or_rnr(chan, 1); | |
2432 | chan->retry_count = 1; | |
2433 | __set_monitor_timer(chan); | |
2434 | __clear_ack_timer(chan); | |
2435 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2436 | break; | |
2437 | case L2CAP_EV_RETRANS_TO: | |
2438 | l2cap_send_rr_or_rnr(chan, 1); | |
2439 | chan->retry_count = 1; | |
2440 | __set_monitor_timer(chan); | |
2441 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2442 | break; | |
2443 | case L2CAP_EV_RECV_FBIT: | |
2444 | /* Nothing to process */ | |
2445 | break; | |
2446 | default: | |
2447 | break; | |
2448 | } | |
608bcc6d MM |
2449 | } |
2450 | ||
d660366d GP |
2451 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2452 | struct l2cap_ctrl *control, | |
2453 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2454 | { |
608bcc6d MM |
2455 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2456 | event); | |
2457 | ||
2458 | switch (event) { | |
2459 | case L2CAP_EV_DATA_REQUEST: | |
2460 | if (chan->tx_send_head == NULL) | |
2461 | chan->tx_send_head = skb_peek(skbs); | |
2462 | /* Queue data, but don't send. */ | |
2463 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2464 | break; | |
2465 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2466 | BT_DBG("Enter LOCAL_BUSY"); | |
2467 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2468 | ||
2469 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2470 | /* The SREJ_SENT state must be aborted if we are to | |
2471 | * enter the LOCAL_BUSY state. | |
2472 | */ | |
2473 | l2cap_abort_rx_srej_sent(chan); | |
2474 | } | |
2475 | ||
2476 | l2cap_send_ack(chan); | |
2477 | ||
2478 | break; | |
2479 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2480 | BT_DBG("Exit LOCAL_BUSY"); | |
2481 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2482 | ||
2483 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2484 | struct l2cap_ctrl local_control; | |
2485 | memset(&local_control, 0, sizeof(local_control)); | |
2486 | local_control.sframe = 1; | |
2487 | local_control.super = L2CAP_SUPER_RR; | |
2488 | local_control.poll = 1; | |
2489 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2490 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2491 | |
2492 | chan->retry_count = 1; | |
2493 | __set_monitor_timer(chan); | |
2494 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2495 | } | |
2496 | break; | |
2497 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2498 | l2cap_process_reqseq(chan, control->reqseq); | |
2499 | ||
2500 | /* Fall through */ | |
2501 | ||
2502 | case L2CAP_EV_RECV_FBIT: | |
2503 | if (control && control->final) { | |
2504 | __clear_monitor_timer(chan); | |
2505 | if (chan->unacked_frames > 0) | |
2506 | __set_retrans_timer(chan); | |
2507 | chan->retry_count = 0; | |
2508 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2509 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2510 | } | |
2511 | break; | |
2512 | case L2CAP_EV_EXPLICIT_POLL: | |
2513 | /* Ignore */ | |
2514 | break; | |
2515 | case L2CAP_EV_MONITOR_TO: | |
2516 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2517 | l2cap_send_rr_or_rnr(chan, 1); | |
2518 | __set_monitor_timer(chan); | |
2519 | chan->retry_count++; | |
2520 | } else { | |
2521 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2522 | } | |
2523 | break; | |
2524 | default: | |
2525 | break; | |
2526 | } | |
608bcc6d MM |
2527 | } |
2528 | ||
d660366d GP |
2529 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2530 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2531 | { |
608bcc6d MM |
2532 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2533 | chan, control, skbs, event, chan->tx_state); | |
2534 | ||
2535 | switch (chan->tx_state) { | |
2536 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2537 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2538 | break; |
2539 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2540 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2541 | break; |
2542 | default: | |
2543 | /* Ignore event */ | |
2544 | break; | |
2545 | } | |
608bcc6d MM |
2546 | } |
2547 | ||
4b51dae9 MM |
2548 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2549 | struct l2cap_ctrl *control) | |
2550 | { | |
2551 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2552 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2553 | } |
2554 | ||
f80842a8 MM |
2555 | static void l2cap_pass_to_tx_fbit(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_FBIT); |
f80842a8 MM |
2560 | } |
2561 | ||
1da177e4 LT |
2562 | /* Copy frame to all raw sockets on that connection */ |
2563 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2564 | { | |
1da177e4 | 2565 | struct sk_buff *nskb; |
48454079 | 2566 | struct l2cap_chan *chan; |
1da177e4 LT |
2567 | |
2568 | BT_DBG("conn %p", conn); | |
2569 | ||
3df91ea2 | 2570 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2571 | |
3df91ea2 | 2572 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2573 | struct sock *sk = chan->sk; |
715ec005 | 2574 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2575 | continue; |
2576 | ||
2577 | /* Don't send frame to the socket it came from */ | |
2578 | if (skb->sk == sk) | |
2579 | continue; | |
8bcde1f2 | 2580 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2581 | if (!nskb) |
1da177e4 LT |
2582 | continue; |
2583 | ||
80b98027 | 2584 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2585 | kfree_skb(nskb); |
2586 | } | |
3d57dc68 | 2587 | |
3df91ea2 | 2588 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2589 | } |
2590 | ||
2591 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2592 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2593 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2594 | { |
2595 | struct sk_buff *skb, **frag; | |
2596 | struct l2cap_cmd_hdr *cmd; | |
2597 | struct l2cap_hdr *lh; | |
2598 | int len, count; | |
2599 | ||
b4400672 AE |
2600 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2601 | conn, code, ident, dlen); | |
1da177e4 LT |
2602 | |
2603 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2604 | count = min_t(unsigned int, conn->mtu, len); | |
2605 | ||
8bcde1f2 | 2606 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2607 | if (!skb) |
2608 | return NULL; | |
2609 | ||
2610 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2611 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2612 | |
2613 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2614 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2615 | else |
ac73498c | 2616 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2617 | |
2618 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2619 | cmd->code = code; | |
2620 | cmd->ident = ident; | |
aca3192c | 2621 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2622 | |
2623 | if (dlen) { | |
2624 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2625 | memcpy(skb_put(skb, count), data, count); | |
2626 | data += count; | |
2627 | } | |
2628 | ||
2629 | len -= skb->len; | |
2630 | ||
2631 | /* Continuation fragments (no L2CAP header) */ | |
2632 | frag = &skb_shinfo(skb)->frag_list; | |
2633 | while (len) { | |
2634 | count = min_t(unsigned int, conn->mtu, len); | |
2635 | ||
8bcde1f2 | 2636 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2637 | if (!*frag) |
2638 | goto fail; | |
2639 | ||
2640 | memcpy(skb_put(*frag, count), data, count); | |
2641 | ||
2642 | len -= count; | |
2643 | data += count; | |
2644 | ||
2645 | frag = &(*frag)->next; | |
2646 | } | |
2647 | ||
2648 | return skb; | |
2649 | ||
2650 | fail: | |
2651 | kfree_skb(skb); | |
2652 | return NULL; | |
2653 | } | |
2654 | ||
2d792818 GP |
2655 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2656 | unsigned long *val) | |
1da177e4 LT |
2657 | { |
2658 | struct l2cap_conf_opt *opt = *ptr; | |
2659 | int len; | |
2660 | ||
2661 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2662 | *ptr += len; | |
2663 | ||
2664 | *type = opt->type; | |
2665 | *olen = opt->len; | |
2666 | ||
2667 | switch (opt->len) { | |
2668 | case 1: | |
2669 | *val = *((u8 *) opt->val); | |
2670 | break; | |
2671 | ||
2672 | case 2: | |
bfaaeb3e | 2673 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2674 | break; |
2675 | ||
2676 | case 4: | |
bfaaeb3e | 2677 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2678 | break; |
2679 | ||
2680 | default: | |
2681 | *val = (unsigned long) opt->val; | |
2682 | break; | |
2683 | } | |
2684 | ||
b4400672 | 2685 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2686 | return len; |
2687 | } | |
2688 | ||
1da177e4 LT |
2689 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2690 | { | |
2691 | struct l2cap_conf_opt *opt = *ptr; | |
2692 | ||
b4400672 | 2693 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2694 | |
2695 | opt->type = type; | |
2696 | opt->len = len; | |
2697 | ||
2698 | switch (len) { | |
2699 | case 1: | |
2700 | *((u8 *) opt->val) = val; | |
2701 | break; | |
2702 | ||
2703 | case 2: | |
4f8b691c | 2704 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2705 | break; |
2706 | ||
2707 | case 4: | |
4f8b691c | 2708 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2709 | break; |
2710 | ||
2711 | default: | |
2712 | memcpy(opt->val, (void *) val, len); | |
2713 | break; | |
2714 | } | |
2715 | ||
2716 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2717 | } | |
2718 | ||
f89cef09 AE |
2719 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2720 | { | |
2721 | struct l2cap_conf_efs efs; | |
2722 | ||
1ec918ce | 2723 | switch (chan->mode) { |
f89cef09 AE |
2724 | case L2CAP_MODE_ERTM: |
2725 | efs.id = chan->local_id; | |
2726 | efs.stype = chan->local_stype; | |
2727 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2728 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2729 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2730 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2731 | break; |
2732 | ||
2733 | case L2CAP_MODE_STREAMING: | |
2734 | efs.id = 1; | |
2735 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2736 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2737 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2738 | efs.acc_lat = 0; | |
2739 | efs.flush_to = 0; | |
2740 | break; | |
2741 | ||
2742 | default: | |
2743 | return; | |
2744 | } | |
2745 | ||
2746 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2747 | (unsigned long) &efs); |
f89cef09 AE |
2748 | } |
2749 | ||
721c4181 | 2750 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2751 | { |
721c4181 | 2752 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2753 | ack_timer.work); |
2754 | u16 frames_to_ack; | |
c1b4f43b | 2755 | |
2fb9b3d4 GP |
2756 | BT_DBG("chan %p", chan); |
2757 | ||
6be36555 AE |
2758 | l2cap_chan_lock(chan); |
2759 | ||
0362520b MM |
2760 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2761 | chan->last_acked_seq); | |
6be36555 | 2762 | |
0362520b MM |
2763 | if (frames_to_ack) |
2764 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2765 | |
0362520b | 2766 | l2cap_chan_unlock(chan); |
09bfb2ee | 2767 | l2cap_chan_put(chan); |
c1b4f43b GP |
2768 | } |
2769 | ||
466f8004 | 2770 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2771 | { |
3c588192 MM |
2772 | int err; |
2773 | ||
105bdf9e MM |
2774 | chan->next_tx_seq = 0; |
2775 | chan->expected_tx_seq = 0; | |
42e5c802 | 2776 | chan->expected_ack_seq = 0; |
6a026610 | 2777 | chan->unacked_frames = 0; |
42e5c802 | 2778 | chan->buffer_seq = 0; |
6a026610 | 2779 | chan->frames_sent = 0; |
105bdf9e MM |
2780 | chan->last_acked_seq = 0; |
2781 | chan->sdu = NULL; | |
2782 | chan->sdu_last_frag = NULL; | |
2783 | chan->sdu_len = 0; | |
2784 | ||
d34c34fb MM |
2785 | skb_queue_head_init(&chan->tx_q); |
2786 | ||
105bdf9e MM |
2787 | if (chan->mode != L2CAP_MODE_ERTM) |
2788 | return 0; | |
2789 | ||
2790 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2791 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2792 | |
721c4181 GP |
2793 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2794 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2795 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2796 | |
f1c6775b | 2797 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2798 | |
3c588192 MM |
2799 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2800 | if (err < 0) | |
2801 | return err; | |
2802 | ||
9dc9affc MM |
2803 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2804 | if (err < 0) | |
2805 | l2cap_seq_list_free(&chan->srej_list); | |
2806 | ||
2807 | return err; | |
0565c1c2 GP |
2808 | } |
2809 | ||
f2fcfcd6 GP |
2810 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2811 | { | |
2812 | switch (mode) { | |
2813 | case L2CAP_MODE_STREAMING: | |
2814 | case L2CAP_MODE_ERTM: | |
2815 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2816 | return mode; | |
2817 | /* fall through */ | |
2818 | default: | |
2819 | return L2CAP_MODE_BASIC; | |
2820 | } | |
2821 | } | |
2822 | ||
6327eb98 AE |
2823 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2824 | { | |
2825 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2826 | } | |
2827 | ||
f89cef09 AE |
2828 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2829 | { | |
2830 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2831 | } | |
2832 | ||
6327eb98 AE |
2833 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2834 | { | |
2835 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
2d792818 | 2836 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2837 | /* use extended control field */ |
2838 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2839 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2840 | } else { | |
6327eb98 | 2841 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 2842 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
2843 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2844 | } | |
c20f8e35 | 2845 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2846 | } |
2847 | ||
710f9b0a | 2848 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2849 | { |
1da177e4 | 2850 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2851 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2852 | void *ptr = req->data; |
c8f79162 | 2853 | u16 size; |
1da177e4 | 2854 | |
49208c9c | 2855 | BT_DBG("chan %p", chan); |
1da177e4 | 2856 | |
73ffa904 | 2857 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2858 | goto done; |
2859 | ||
0c1bc5c6 | 2860 | switch (chan->mode) { |
f2fcfcd6 GP |
2861 | case L2CAP_MODE_STREAMING: |
2862 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2863 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2864 | break; |
85eb53c6 | 2865 | |
f89cef09 AE |
2866 | if (__l2cap_efs_supported(chan)) |
2867 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2868 | ||
2ba13ed6 | 2869 | /* fall through */ |
f2fcfcd6 | 2870 | default: |
8c1d787b | 2871 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2872 | break; |
2873 | } | |
2874 | ||
2875 | done: | |
0c1bc5c6 GP |
2876 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2877 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2878 | |
0c1bc5c6 | 2879 | switch (chan->mode) { |
65c7c491 | 2880 | case L2CAP_MODE_BASIC: |
8c1d787b | 2881 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 2882 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
2883 | break; |
2884 | ||
62547752 GP |
2885 | rfc.mode = L2CAP_MODE_BASIC; |
2886 | rfc.txwin_size = 0; | |
2887 | rfc.max_transmit = 0; | |
2888 | rfc.retrans_timeout = 0; | |
2889 | rfc.monitor_timeout = 0; | |
2890 | rfc.max_pdu_size = 0; | |
2891 | ||
63406504 | 2892 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2893 | (unsigned long) &rfc); |
65c7c491 MH |
2894 | break; |
2895 | ||
2896 | case L2CAP_MODE_ERTM: | |
2897 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2898 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2899 | rfc.retrans_timeout = 0; |
2900 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2901 | |
2902 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2903 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2904 | L2CAP_FCS_SIZE); | |
c8f79162 | 2905 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 2906 | |
6327eb98 AE |
2907 | l2cap_txwin_setup(chan); |
2908 | ||
2909 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 2910 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 2911 | |
63406504 | 2912 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2913 | (unsigned long) &rfc); |
63406504 | 2914 | |
f89cef09 AE |
2915 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2916 | l2cap_add_opt_efs(&ptr, chan); | |
2917 | ||
8c1d787b | 2918 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2919 | break; |
2920 | ||
47d1ec61 | 2921 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2922 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2923 | chan->fcs = L2CAP_FCS_NONE; |
2924 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2925 | } |
6327eb98 AE |
2926 | |
2927 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2928 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 2929 | chan->tx_win); |
f2fcfcd6 GP |
2930 | break; |
2931 | ||
2932 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2933 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2934 | rfc.mode = L2CAP_MODE_STREAMING; |
2935 | rfc.txwin_size = 0; | |
2936 | rfc.max_transmit = 0; | |
2937 | rfc.retrans_timeout = 0; | |
2938 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2939 | |
2940 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2941 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2942 | L2CAP_FCS_SIZE); | |
c8f79162 | 2943 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 2944 | |
63406504 | 2945 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2946 | (unsigned long) &rfc); |
63406504 | 2947 | |
f89cef09 AE |
2948 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2949 | l2cap_add_opt_efs(&ptr, chan); | |
2950 | ||
8c1d787b | 2951 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2952 | break; |
2953 | ||
47d1ec61 | 2954 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2955 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2956 | chan->fcs = L2CAP_FCS_NONE; |
2957 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2958 | } |
65c7c491 MH |
2959 | break; |
2960 | } | |
1da177e4 | 2961 | |
fe4128e0 | 2962 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2963 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2964 | |
2965 | return ptr - data; | |
2966 | } | |
2967 | ||
73ffa904 | 2968 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2969 | { |
5dee9e7c MH |
2970 | struct l2cap_conf_rsp *rsp = data; |
2971 | void *ptr = rsp->data; | |
73ffa904 GP |
2972 | void *req = chan->conf_req; |
2973 | int len = chan->conf_len; | |
5dee9e7c MH |
2974 | int type, hint, olen; |
2975 | unsigned long val; | |
6464f35f | 2976 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2977 | struct l2cap_conf_efs efs; |
2978 | u8 remote_efs = 0; | |
861d6882 | 2979 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2980 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2981 | u16 size; |
1da177e4 | 2982 | |
73ffa904 | 2983 | BT_DBG("chan %p", chan); |
820ae1b8 | 2984 | |
5dee9e7c MH |
2985 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2986 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2987 | |
589d2746 | 2988 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2989 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2990 | |
2991 | switch (type) { | |
2992 | case L2CAP_CONF_MTU: | |
861d6882 | 2993 | mtu = val; |
5dee9e7c MH |
2994 | break; |
2995 | ||
2996 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2997 | chan->flush_to = val; |
5dee9e7c MH |
2998 | break; |
2999 | ||
3000 | case L2CAP_CONF_QOS: | |
3001 | break; | |
3002 | ||
6464f35f MH |
3003 | case L2CAP_CONF_RFC: |
3004 | if (olen == sizeof(rfc)) | |
3005 | memcpy(&rfc, (void *) val, olen); | |
3006 | break; | |
3007 | ||
fcc203c3 GP |
3008 | case L2CAP_CONF_FCS: |
3009 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3010 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3011 | break; |
fcc203c3 | 3012 | |
42dceae2 AE |
3013 | case L2CAP_CONF_EFS: |
3014 | remote_efs = 1; | |
3015 | if (olen == sizeof(efs)) | |
3016 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3017 | break; |
3018 | ||
6327eb98 AE |
3019 | case L2CAP_CONF_EWS: |
3020 | if (!enable_hs) | |
3021 | return -ECONNREFUSED; | |
fcc203c3 | 3022 | |
6327eb98 AE |
3023 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3024 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3025 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3026 | chan->remote_tx_win = val; |
fcc203c3 GP |
3027 | break; |
3028 | ||
5dee9e7c MH |
3029 | default: |
3030 | if (hint) | |
3031 | break; | |
3032 | ||
3033 | result = L2CAP_CONF_UNKNOWN; | |
3034 | *((u8 *) ptr++) = type; | |
3035 | break; | |
3036 | } | |
3037 | } | |
3038 | ||
73ffa904 | 3039 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3040 | goto done; |
3041 | ||
0c1bc5c6 | 3042 | switch (chan->mode) { |
f2fcfcd6 GP |
3043 | case L2CAP_MODE_STREAMING: |
3044 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3045 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3046 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3047 | chan->conn->feat_mask); |
85eb53c6 GP |
3048 | break; |
3049 | } | |
3050 | ||
42dceae2 AE |
3051 | if (remote_efs) { |
3052 | if (__l2cap_efs_supported(chan)) | |
3053 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3054 | else | |
3055 | return -ECONNREFUSED; | |
3056 | } | |
3057 | ||
0c1bc5c6 | 3058 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3059 | return -ECONNREFUSED; |
742e519b | 3060 | |
f2fcfcd6 | 3061 | break; |
f2fcfcd6 GP |
3062 | } |
3063 | ||
3064 | done: | |
0c1bc5c6 | 3065 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3066 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3067 | rfc.mode = chan->mode; |
f2fcfcd6 | 3068 | |
73ffa904 | 3069 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3070 | return -ECONNREFUSED; |
3071 | ||
2d792818 GP |
3072 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3073 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3074 | } |
3075 | ||
5dee9e7c MH |
3076 | if (result == L2CAP_CONF_SUCCESS) { |
3077 | /* Configure output options and let the other side know | |
3078 | * which ones we don't like. */ | |
3079 | ||
f2fcfcd6 GP |
3080 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3081 | result = L2CAP_CONF_UNACCEPT; | |
3082 | else { | |
0c1bc5c6 | 3083 | chan->omtu = mtu; |
c1360a1c | 3084 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3085 | } |
0c1bc5c6 | 3086 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3087 | |
42dceae2 AE |
3088 | if (remote_efs) { |
3089 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3090 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3091 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3092 | |
3093 | result = L2CAP_CONF_UNACCEPT; | |
3094 | ||
3095 | if (chan->num_conf_req >= 1) | |
3096 | return -ECONNREFUSED; | |
3097 | ||
3098 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3099 | sizeof(efs), |
3100 | (unsigned long) &efs); | |
0e8b207e | 3101 | } else { |
3e6b3b95 | 3102 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3103 | result = L2CAP_CONF_PENDING; |
3104 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3105 | } |
3106 | } | |
3107 | ||
f2fcfcd6 GP |
3108 | switch (rfc.mode) { |
3109 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3110 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3111 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3112 | break; |
3113 | ||
3114 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3115 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3116 | chan->remote_tx_win = rfc.txwin_size; | |
3117 | else | |
3118 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3119 | |
2c03a7a4 | 3120 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3121 | |
c8f79162 | 3122 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3123 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3124 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3125 | rfc.max_pdu_size = cpu_to_le16(size); |
3126 | chan->remote_mps = size; | |
f2fcfcd6 | 3127 | |
10467e9e | 3128 | rfc.retrans_timeout = |
4fd21a88 | 3129 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3130 | rfc.monitor_timeout = |
4fd21a88 | 3131 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3132 | |
c1360a1c | 3133 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3134 | |
3135 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3136 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3137 | |
42dceae2 AE |
3138 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3139 | chan->remote_id = efs.id; | |
3140 | chan->remote_stype = efs.stype; | |
3141 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3142 | chan->remote_flush_to = | |
2d792818 | 3143 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3144 | chan->remote_acc_lat = |
2d792818 | 3145 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3146 | chan->remote_sdu_itime = |
3147 | le32_to_cpu(efs.sdu_itime); | |
3148 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3149 | sizeof(efs), |
3150 | (unsigned long) &efs); | |
42dceae2 | 3151 | } |
f2fcfcd6 GP |
3152 | break; |
3153 | ||
3154 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3155 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3156 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3157 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3158 | rfc.max_pdu_size = cpu_to_le16(size); |
3159 | chan->remote_mps = size; | |
f2fcfcd6 | 3160 | |
c1360a1c | 3161 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3162 | |
2d792818 GP |
3163 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3164 | (unsigned long) &rfc); | |
68ae6639 | 3165 | |
f2fcfcd6 GP |
3166 | break; |
3167 | ||
3168 | default: | |
5dee9e7c | 3169 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3170 | |
6464f35f | 3171 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3172 | rfc.mode = chan->mode; |
f2fcfcd6 | 3173 | } |
6464f35f | 3174 | |
f2fcfcd6 | 3175 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3176 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3177 | } |
fe4128e0 | 3178 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3179 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3180 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3181 | |
3182 | return ptr - data; | |
1da177e4 LT |
3183 | } |
3184 | ||
2d792818 GP |
3185 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3186 | void *data, u16 *result) | |
f2fcfcd6 | 3187 | { |
f2fcfcd6 GP |
3188 | struct l2cap_conf_req *req = data; |
3189 | void *ptr = req->data; | |
3190 | int type, olen; | |
3191 | unsigned long val; | |
36e999a8 | 3192 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3193 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3194 | |
fe4128e0 | 3195 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3196 | |
3197 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3198 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3199 | ||
3200 | switch (type) { | |
3201 | case L2CAP_CONF_MTU: | |
3202 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3203 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3204 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3205 | } else |
0c1bc5c6 GP |
3206 | chan->imtu = val; |
3207 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3208 | break; |
3209 | ||
3210 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3211 | chan->flush_to = val; |
f2fcfcd6 | 3212 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3213 | 2, chan->flush_to); |
f2fcfcd6 GP |
3214 | break; |
3215 | ||
3216 | case L2CAP_CONF_RFC: | |
3217 | if (olen == sizeof(rfc)) | |
3218 | memcpy(&rfc, (void *)val, olen); | |
3219 | ||
c1360a1c | 3220 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3221 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3222 | return -ECONNREFUSED; |
3223 | ||
47d1ec61 | 3224 | chan->fcs = 0; |
f2fcfcd6 GP |
3225 | |
3226 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3227 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3228 | break; |
6327eb98 AE |
3229 | |
3230 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3231 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3232 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3233 | chan->tx_win); |
6327eb98 | 3234 | break; |
66af7aaf AE |
3235 | |
3236 | case L2CAP_CONF_EFS: | |
3237 | if (olen == sizeof(efs)) | |
3238 | memcpy(&efs, (void *)val, olen); | |
3239 | ||
3240 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3241 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3242 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3243 | return -ECONNREFUSED; |
3244 | ||
2d792818 GP |
3245 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3246 | (unsigned long) &efs); | |
66af7aaf | 3247 | break; |
f2fcfcd6 GP |
3248 | } |
3249 | } | |
3250 | ||
0c1bc5c6 | 3251 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3252 | return -ECONNREFUSED; |
3253 | ||
0c1bc5c6 | 3254 | chan->mode = rfc.mode; |
6c2ea7a8 | 3255 | |
0e8b207e | 3256 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3257 | switch (rfc.mode) { |
3258 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3259 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3260 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3261 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3262 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3263 | chan->ack_win = min_t(u16, chan->ack_win, | |
3264 | rfc.txwin_size); | |
66af7aaf AE |
3265 | |
3266 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3267 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3268 | chan->local_sdu_itime = | |
2d792818 | 3269 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3270 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3271 | chan->local_flush_to = | |
2d792818 | 3272 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3273 | } |
f2fcfcd6 | 3274 | break; |
66af7aaf | 3275 | |
f2fcfcd6 | 3276 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3277 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3278 | } |
3279 | } | |
3280 | ||
fe4128e0 | 3281 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3282 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3283 | |
3284 | return ptr - data; | |
3285 | } | |
3286 | ||
2d792818 GP |
3287 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3288 | u16 result, u16 flags) | |
1da177e4 LT |
3289 | { |
3290 | struct l2cap_conf_rsp *rsp = data; | |
3291 | void *ptr = rsp->data; | |
1da177e4 | 3292 | |
fe4128e0 | 3293 | BT_DBG("chan %p", chan); |
1da177e4 | 3294 | |
fe4128e0 | 3295 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3296 | rsp->result = cpu_to_le16(result); |
aca3192c | 3297 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3298 | |
3299 | return ptr - data; | |
3300 | } | |
3301 | ||
8c1d787b | 3302 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3303 | { |
3304 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3305 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3306 | u8 buf[128]; |
3307 | ||
fe4128e0 GP |
3308 | rsp.scid = cpu_to_le16(chan->dcid); |
3309 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3310 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3311 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
2d792818 | 3312 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
710f9b0a | 3313 | |
c1360a1c | 3314 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3315 | return; |
3316 | ||
710f9b0a | 3317 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3318 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3319 | chan->num_conf_req++; |
3320 | } | |
3321 | ||
47d1ec61 | 3322 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3323 | { |
7b1c0049 GP |
3324 | int type, olen; |
3325 | unsigned long val; | |
c20f8e35 MM |
3326 | /* Use sane default values in case a misbehaving remote device |
3327 | * did not send an RFC or extended window size option. | |
3328 | */ | |
3329 | u16 txwin_ext = chan->ack_win; | |
3330 | struct l2cap_conf_rfc rfc = { | |
3331 | .mode = chan->mode, | |
3332 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3333 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3334 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3335 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3336 | }; | |
7b1c0049 | 3337 | |
47d1ec61 | 3338 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3339 | |
0c1bc5c6 | 3340 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3341 | return; |
3342 | ||
3343 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3344 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3345 | ||
c20f8e35 MM |
3346 | switch (type) { |
3347 | case L2CAP_CONF_RFC: | |
3348 | if (olen == sizeof(rfc)) | |
3349 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3350 | break; |
c20f8e35 MM |
3351 | case L2CAP_CONF_EWS: |
3352 | txwin_ext = val; | |
3353 | break; | |
3354 | } | |
7b1c0049 GP |
3355 | } |
3356 | ||
7b1c0049 GP |
3357 | switch (rfc.mode) { |
3358 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3359 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3360 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3361 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3362 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3363 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3364 | else | |
3365 | chan->ack_win = min_t(u16, chan->ack_win, | |
3366 | rfc.txwin_size); | |
7b1c0049 GP |
3367 | break; |
3368 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3369 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3370 | } |
3371 | } | |
3372 | ||
2d792818 GP |
3373 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
3374 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4e8402a3 | 3375 | { |
e2fd318e | 3376 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3377 | |
e2fd318e | 3378 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3379 | return 0; |
3380 | ||
3381 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3382 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3383 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3384 | |
3385 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3386 | conn->info_ident = 0; |
984947dc | 3387 | |
4e8402a3 MH |
3388 | l2cap_conn_start(conn); |
3389 | } | |
3390 | ||
3391 | return 0; | |
3392 | } | |
3393 | ||
300229f9 GP |
3394 | static void l2cap_connect(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, |
3395 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3396 | { |
1da177e4 LT |
3397 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3398 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3399 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3400 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3401 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3402 | |
3403 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3404 | __le16 psm = req->psm; |
1da177e4 | 3405 | |
097db76c | 3406 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3407 | |
3408 | /* Check if we have socket listening on psm */ | |
c2287681 | 3409 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3410 | if (!pchan) { |
1da177e4 LT |
3411 | result = L2CAP_CR_BAD_PSM; |
3412 | goto sendresp; | |
3413 | } | |
3414 | ||
23691d75 GP |
3415 | parent = pchan->sk; |
3416 | ||
3df91ea2 | 3417 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3418 | lock_sock(parent); |
e0f0cb56 | 3419 | |
e7c29cb1 | 3420 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3421 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3422 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3423 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3424 | result = L2CAP_CR_SEC_BLOCK; |
3425 | goto response; | |
3426 | } | |
3427 | ||
1da177e4 LT |
3428 | result = L2CAP_CR_NO_MEM; |
3429 | ||
2dfa1003 GP |
3430 | /* Check if we already have channel with that dcid */ |
3431 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3432 | goto response; | |
3433 | ||
80b98027 | 3434 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3435 | if (!chan) |
1da177e4 LT |
3436 | goto response; |
3437 | ||
80808e43 GP |
3438 | sk = chan->sk; |
3439 | ||
1da177e4 LT |
3440 | hci_conn_hold(conn->hcon); |
3441 | ||
1da177e4 LT |
3442 | bacpy(&bt_sk(sk)->src, conn->src); |
3443 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3444 | chan->psm = psm; |
3445 | chan->dcid = scid; | |
1da177e4 | 3446 | |
6be36555 | 3447 | __l2cap_chan_add(conn, chan); |
48454079 | 3448 | |
fe4128e0 | 3449 | dcid = chan->scid; |
1da177e4 | 3450 | |
c9b66675 | 3451 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3452 | |
fc7f8a7e | 3453 | chan->ident = cmd->ident; |
1da177e4 | 3454 | |
984947dc | 3455 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3456 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3457 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3458 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3459 | result = L2CAP_CR_PEND; |
3460 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3461 | chan->ops->defer(chan); |
f66dc81f | 3462 | } else { |
0e587be7 | 3463 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3464 | result = L2CAP_CR_SUCCESS; |
3465 | status = L2CAP_CS_NO_INFO; | |
3466 | } | |
79d554a6 | 3467 | } else { |
0e587be7 | 3468 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3469 | result = L2CAP_CR_PEND; |
3470 | status = L2CAP_CS_AUTHEN_PEND; | |
3471 | } | |
3472 | } else { | |
0e587be7 | 3473 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3474 | result = L2CAP_CR_PEND; |
3475 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3476 | } |
3477 | ||
1da177e4 | 3478 | response: |
aa2ac881 | 3479 | release_sock(parent); |
3df91ea2 | 3480 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3481 | |
3482 | sendresp: | |
aca3192c YH |
3483 | rsp.scid = cpu_to_le16(scid); |
3484 | rsp.dcid = cpu_to_le16(dcid); | |
3485 | rsp.result = cpu_to_le16(result); | |
3486 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3487 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3488 | |
3489 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3490 | struct l2cap_info_req info; | |
ac73498c | 3491 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3492 | |
3493 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3494 | conn->info_ident = l2cap_get_ident(conn); | |
3495 | ||
ba13ccd9 | 3496 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3497 | |
2d792818 GP |
3498 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3499 | sizeof(info), &info); | |
79d554a6 MH |
3500 | } |
3501 | ||
c1360a1c | 3502 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3503 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3504 | u8 buf[128]; |
c1360a1c | 3505 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3506 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3507 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3508 | chan->num_conf_req++; |
e9aeb2dd | 3509 | } |
4c89b6aa | 3510 | } |
e9aeb2dd | 3511 | |
4c89b6aa MM |
3512 | static int l2cap_connect_req(struct l2cap_conn *conn, |
3513 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3514 | { | |
300229f9 | 3515 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3516 | return 0; |
3517 | } | |
3518 | ||
2d792818 GP |
3519 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, |
3520 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3521 | { |
3522 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3523 | u16 scid, dcid, result, status; | |
48454079 | 3524 | struct l2cap_chan *chan; |
1da177e4 | 3525 | u8 req[128]; |
3df91ea2 | 3526 | int err; |
1da177e4 LT |
3527 | |
3528 | scid = __le16_to_cpu(rsp->scid); | |
3529 | dcid = __le16_to_cpu(rsp->dcid); | |
3530 | result = __le16_to_cpu(rsp->result); | |
3531 | status = __le16_to_cpu(rsp->status); | |
3532 | ||
1b009c98 | 3533 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3534 | dcid, scid, result, status); |
1da177e4 | 3535 | |
3df91ea2 AE |
3536 | mutex_lock(&conn->chan_lock); |
3537 | ||
1da177e4 | 3538 | if (scid) { |
3df91ea2 AE |
3539 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3540 | if (!chan) { | |
3541 | err = -EFAULT; | |
3542 | goto unlock; | |
3543 | } | |
1da177e4 | 3544 | } else { |
3df91ea2 AE |
3545 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3546 | if (!chan) { | |
3547 | err = -EFAULT; | |
3548 | goto unlock; | |
3549 | } | |
1da177e4 LT |
3550 | } |
3551 | ||
3df91ea2 AE |
3552 | err = 0; |
3553 | ||
6be36555 | 3554 | l2cap_chan_lock(chan); |
48454079 | 3555 | |
1da177e4 LT |
3556 | switch (result) { |
3557 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3558 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3559 | chan->ident = 0; |
fe4128e0 | 3560 | chan->dcid = dcid; |
c1360a1c | 3561 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3562 | |
c1360a1c | 3563 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3564 | break; |
3565 | ||
1da177e4 | 3566 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3567 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3568 | chan->num_conf_req++; |
1da177e4 LT |
3569 | break; |
3570 | ||
3571 | case L2CAP_CR_PEND: | |
c1360a1c | 3572 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3573 | break; |
3574 | ||
3575 | default: | |
48454079 | 3576 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3577 | break; |
3578 | } | |
3579 | ||
6be36555 | 3580 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3581 | |
3582 | unlock: | |
3583 | mutex_unlock(&conn->chan_lock); | |
3584 | ||
3585 | return err; | |
1da177e4 LT |
3586 | } |
3587 | ||
47d1ec61 | 3588 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3589 | { |
3590 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3591 | * sides request it. | |
3592 | */ | |
0c1bc5c6 | 3593 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3594 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3595 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3596 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3597 | } |
3598 | ||
29d8a590 AE |
3599 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3600 | u8 ident, u16 flags) | |
3601 | { | |
3602 | struct l2cap_conn *conn = chan->conn; | |
3603 | ||
3604 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3605 | flags); | |
3606 | ||
3607 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3608 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3609 | ||
3610 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3611 | l2cap_build_conf_rsp(chan, data, | |
3612 | L2CAP_CONF_SUCCESS, flags), data); | |
3613 | } | |
3614 | ||
2d792818 GP |
3615 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3616 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3617 | u8 *data) | |
1da177e4 LT |
3618 | { |
3619 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3620 | u16 dcid, flags; | |
3621 | u8 rsp[64]; | |
48454079 | 3622 | struct l2cap_chan *chan; |
3c588192 | 3623 | int len, err = 0; |
1da177e4 LT |
3624 | |
3625 | dcid = __le16_to_cpu(req->dcid); | |
3626 | flags = __le16_to_cpu(req->flags); | |
3627 | ||
3628 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3629 | ||
baa7e1fa | 3630 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3631 | if (!chan) |
1da177e4 LT |
3632 | return -ENOENT; |
3633 | ||
033b1142 | 3634 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3635 | struct l2cap_cmd_rej_cid rej; |
3636 | ||
ac73498c | 3637 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3638 | rej.scid = cpu_to_le16(chan->scid); |
3639 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3640 | |
df6bd743 | 3641 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2d792818 | 3642 | sizeof(rej), &rej); |
354f60a9 | 3643 | goto unlock; |
df6bd743 | 3644 | } |
354f60a9 | 3645 | |
5dee9e7c | 3646 | /* Reject if config buffer is too small. */ |
88219a0f | 3647 | len = cmd_len - sizeof(*req); |
7ac28817 | 3648 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3649 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
3650 | l2cap_build_conf_rsp(chan, rsp, |
3651 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
3652 | goto unlock; |
3653 | } | |
3654 | ||
3655 | /* Store config. */ | |
73ffa904 GP |
3656 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3657 | chan->conf_len += len; | |
1da177e4 | 3658 | |
59e54bd1 | 3659 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3660 | /* Incomplete config. Send empty response. */ |
3661 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
3662 | l2cap_build_conf_rsp(chan, rsp, |
3663 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
3664 | goto unlock; |
3665 | } | |
3666 | ||
3667 | /* Complete config. */ | |
73ffa904 | 3668 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3669 | if (len < 0) { |
e92c8e70 | 3670 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3671 | goto unlock; |
f2fcfcd6 | 3672 | } |
1da177e4 | 3673 | |
5dee9e7c | 3674 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3675 | chan->num_conf_rsp++; |
5dee9e7c | 3676 | |
5dee9e7c | 3677 | /* Reset config buffer. */ |
73ffa904 | 3678 | chan->conf_len = 0; |
5dee9e7c | 3679 | |
c1360a1c | 3680 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3681 | goto unlock; |
3682 | ||
c1360a1c | 3683 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3684 | set_default_fcs(chan); |
fcc203c3 | 3685 | |
105bdf9e MM |
3686 | if (chan->mode == L2CAP_MODE_ERTM || |
3687 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3688 | err = l2cap_ertm_init(chan); |
3689 | ||
3690 | if (err < 0) | |
3691 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3692 | else | |
3693 | l2cap_chan_ready(chan); | |
0565c1c2 | 3694 | |
876d9484 MH |
3695 | goto unlock; |
3696 | } | |
3697 | ||
c1360a1c | 3698 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3699 | u8 buf[64]; |
1da177e4 | 3700 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3701 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3702 | chan->num_conf_req++; |
1da177e4 LT |
3703 | } |
3704 | ||
0e8b207e AE |
3705 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3706 | Conf Rsp PENDING in the code above */ | |
3707 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 3708 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
3709 | |
3710 | /* check compatibility */ | |
3711 | ||
29d8a590 | 3712 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
0e8b207e AE |
3713 | } |
3714 | ||
1da177e4 | 3715 | unlock: |
6be36555 | 3716 | l2cap_chan_unlock(chan); |
3c588192 | 3717 | return err; |
1da177e4 LT |
3718 | } |
3719 | ||
2d792818 GP |
3720 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
3721 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3722 | { |
3723 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3724 | u16 scid, flags, result; | |
48454079 | 3725 | struct l2cap_chan *chan; |
61386cba | 3726 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3727 | int err = 0; |
1da177e4 LT |
3728 | |
3729 | scid = __le16_to_cpu(rsp->scid); | |
3730 | flags = __le16_to_cpu(rsp->flags); | |
3731 | result = __le16_to_cpu(rsp->result); | |
3732 | ||
61386cba AE |
3733 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3734 | result, len); | |
1da177e4 | 3735 | |
baa7e1fa | 3736 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3737 | if (!chan) |
1da177e4 LT |
3738 | return 0; |
3739 | ||
3740 | switch (result) { | |
3741 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3742 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3743 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3744 | break; |
3745 | ||
0e8b207e AE |
3746 | case L2CAP_CONF_PENDING: |
3747 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3748 | ||
3749 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3750 | char buf[64]; | |
3751 | ||
3752 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 3753 | buf, &result); |
0e8b207e AE |
3754 | if (len < 0) { |
3755 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3756 | goto done; | |
3757 | } | |
3758 | ||
3759 | /* check compatibility */ | |
3760 | ||
29d8a590 | 3761 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, 0); |
0e8b207e AE |
3762 | } |
3763 | goto done; | |
3764 | ||
1da177e4 | 3765 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3766 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3767 | char req[64]; |
3768 | ||
c2c77ec8 | 3769 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3770 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3771 | goto done; |
3772 | } | |
3773 | ||
f2fcfcd6 GP |
3774 | /* throw out any old stored conf requests */ |
3775 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 3776 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 3777 | req, &result); |
f2fcfcd6 | 3778 | if (len < 0) { |
e92c8e70 | 3779 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3780 | goto done; |
3781 | } | |
3782 | ||
3783 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 3784 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 3785 | chan->num_conf_req++; |
f2fcfcd6 GP |
3786 | if (result != L2CAP_CONF_SUCCESS) |
3787 | goto done; | |
3788 | break; | |
1da177e4 LT |
3789 | } |
3790 | ||
8e87d142 | 3791 | default: |
6be36555 | 3792 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3793 | |
ba13ccd9 | 3794 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3795 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3796 | goto done; |
3797 | } | |
3798 | ||
59e54bd1 | 3799 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3800 | goto done; |
3801 | ||
c1360a1c | 3802 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3803 | |
c1360a1c | 3804 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3805 | set_default_fcs(chan); |
fcc203c3 | 3806 | |
105bdf9e MM |
3807 | if (chan->mode == L2CAP_MODE_ERTM || |
3808 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3809 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3810 | |
3c588192 MM |
3811 | if (err < 0) |
3812 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3813 | else | |
3814 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3815 | } |
3816 | ||
3817 | done: | |
6be36555 | 3818 | l2cap_chan_unlock(chan); |
3c588192 | 3819 | return err; |
1da177e4 LT |
3820 | } |
3821 | ||
2d792818 GP |
3822 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
3823 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3824 | { |
3825 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3826 | struct l2cap_disconn_rsp rsp; | |
3827 | u16 dcid, scid; | |
48454079 | 3828 | struct l2cap_chan *chan; |
1da177e4 LT |
3829 | struct sock *sk; |
3830 | ||
3831 | scid = __le16_to_cpu(req->scid); | |
3832 | dcid = __le16_to_cpu(req->dcid); | |
3833 | ||
3834 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3835 | ||
3df91ea2 AE |
3836 | mutex_lock(&conn->chan_lock); |
3837 | ||
3838 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3839 | if (!chan) { | |
3840 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3841 | return 0; |
3df91ea2 | 3842 | } |
1da177e4 | 3843 | |
6be36555 AE |
3844 | l2cap_chan_lock(chan); |
3845 | ||
48454079 GP |
3846 | sk = chan->sk; |
3847 | ||
fe4128e0 GP |
3848 | rsp.dcid = cpu_to_le16(chan->scid); |
3849 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3850 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3851 | ||
6be36555 | 3852 | lock_sock(sk); |
1da177e4 | 3853 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3854 | release_sock(sk); |
1da177e4 | 3855 | |
61d6ef3e | 3856 | l2cap_chan_hold(chan); |
48454079 | 3857 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3858 | |
3859 | l2cap_chan_unlock(chan); | |
1da177e4 | 3860 | |
80b98027 | 3861 | chan->ops->close(chan); |
61d6ef3e | 3862 | l2cap_chan_put(chan); |
3df91ea2 AE |
3863 | |
3864 | mutex_unlock(&conn->chan_lock); | |
3865 | ||
1da177e4 LT |
3866 | return 0; |
3867 | } | |
3868 | ||
2d792818 GP |
3869 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
3870 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3871 | { |
3872 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3873 | u16 dcid, scid; | |
48454079 | 3874 | struct l2cap_chan *chan; |
1da177e4 LT |
3875 | |
3876 | scid = __le16_to_cpu(rsp->scid); | |
3877 | dcid = __le16_to_cpu(rsp->dcid); | |
3878 | ||
3879 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3880 | ||
3df91ea2 AE |
3881 | mutex_lock(&conn->chan_lock); |
3882 | ||
3883 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3884 | if (!chan) { | |
3885 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3886 | return 0; |
3df91ea2 | 3887 | } |
1da177e4 | 3888 | |
6be36555 | 3889 | l2cap_chan_lock(chan); |
48454079 | 3890 | |
61d6ef3e | 3891 | l2cap_chan_hold(chan); |
48454079 | 3892 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3893 | |
3894 | l2cap_chan_unlock(chan); | |
1da177e4 | 3895 | |
80b98027 | 3896 | chan->ops->close(chan); |
61d6ef3e | 3897 | l2cap_chan_put(chan); |
3df91ea2 AE |
3898 | |
3899 | mutex_unlock(&conn->chan_lock); | |
3900 | ||
1da177e4 LT |
3901 | return 0; |
3902 | } | |
3903 | ||
2d792818 GP |
3904 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
3905 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3906 | { |
3907 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3908 | u16 type; |
3909 | ||
3910 | type = __le16_to_cpu(req->type); | |
3911 | ||
3912 | BT_DBG("type 0x%4.4x", type); | |
3913 | ||
f0709e03 MH |
3914 | if (type == L2CAP_IT_FEAT_MASK) { |
3915 | u8 buf[8]; | |
44dd46de | 3916 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3917 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3918 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3919 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3920 | if (!disable_ertm) |
fcc203c3 | 3921 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 3922 | | L2CAP_FEAT_FCS; |
a5fd6f30 | 3923 | if (enable_hs) |
6327eb98 | 3924 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 3925 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 3926 | |
1b7bf4ed | 3927 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
3928 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3929 | buf); | |
e1027a7c MH |
3930 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3931 | u8 buf[12]; | |
3932 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3933 | |
3934 | if (enable_hs) | |
3935 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3936 | else | |
3937 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3938 | ||
ac73498c AE |
3939 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3940 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3941 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
3942 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3943 | buf); | |
f0709e03 MH |
3944 | } else { |
3945 | struct l2cap_info_rsp rsp; | |
3946 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3947 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
3948 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
3949 | &rsp); | |
f0709e03 | 3950 | } |
1da177e4 LT |
3951 | |
3952 | return 0; | |
3953 | } | |
3954 | ||
2d792818 GP |
3955 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
3956 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3957 | { |
3958 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3959 | u16 type, result; | |
3960 | ||
3961 | type = __le16_to_cpu(rsp->type); | |
3962 | result = __le16_to_cpu(rsp->result); | |
3963 | ||
3964 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3965 | ||
e90165be AE |
3966 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3967 | if (cmd->ident != conn->info_ident || | |
2d792818 | 3968 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
3969 | return 0; |
3970 | ||
17cd3f37 | 3971 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3972 | |
adb08ede VT |
3973 | if (result != L2CAP_IR_SUCCESS) { |
3974 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3975 | conn->info_ident = 0; | |
3976 | ||
3977 | l2cap_conn_start(conn); | |
3978 | ||
3979 | return 0; | |
3980 | } | |
3981 | ||
978c93b9 AE |
3982 | switch (type) { |
3983 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3984 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3985 | |
47ec1dcd | 3986 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3987 | struct l2cap_info_req req; |
ac73498c | 3988 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3989 | |
3990 | conn->info_ident = l2cap_get_ident(conn); | |
3991 | ||
3992 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 3993 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
3994 | } else { |
3995 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3996 | conn->info_ident = 0; | |
3997 | ||
3998 | l2cap_conn_start(conn); | |
3999 | } | |
978c93b9 AE |
4000 | break; |
4001 | ||
4002 | case L2CAP_IT_FIXED_CHAN: | |
4003 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4004 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4005 | conn->info_ident = 0; |
984947dc MH |
4006 | |
4007 | l2cap_conn_start(conn); | |
978c93b9 | 4008 | break; |
984947dc | 4009 | } |
4e8402a3 | 4010 | |
1da177e4 LT |
4011 | return 0; |
4012 | } | |
4013 | ||
f94ff6ff | 4014 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
2d792818 GP |
4015 | struct l2cap_cmd_hdr *cmd, |
4016 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4017 | { |
4018 | struct l2cap_create_chan_req *req = data; | |
4019 | struct l2cap_create_chan_rsp rsp; | |
4020 | u16 psm, scid; | |
4021 | ||
4022 | if (cmd_len != sizeof(*req)) | |
4023 | return -EPROTO; | |
4024 | ||
4025 | if (!enable_hs) | |
4026 | return -EINVAL; | |
4027 | ||
4028 | psm = le16_to_cpu(req->psm); | |
4029 | scid = le16_to_cpu(req->scid); | |
4030 | ||
ad0ac6ca | 4031 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff MM |
4032 | |
4033 | /* Placeholder: Always reject */ | |
4034 | rsp.dcid = 0; | |
4035 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
4036 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4037 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
4038 | |
4039 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4040 | sizeof(rsp), &rsp); | |
4041 | ||
4042 | return 0; | |
4043 | } | |
4044 | ||
2d792818 GP |
4045 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, |
4046 | struct l2cap_cmd_hdr *cmd, | |
4047 | void *data) | |
4048 | { | |
4049 | BT_DBG("conn %p", conn); | |
4050 | ||
4051 | return l2cap_connect_rsp(conn, cmd, data); | |
4052 | } | |
4053 | ||
8d5a04a1 | 4054 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 4055 | u16 icid, u16 result) |
8d5a04a1 MM |
4056 | { |
4057 | struct l2cap_move_chan_rsp rsp; | |
4058 | ||
ad0ac6ca | 4059 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4060 | |
4061 | rsp.icid = cpu_to_le16(icid); | |
4062 | rsp.result = cpu_to_le16(result); | |
4063 | ||
4064 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4065 | } | |
4066 | ||
4067 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4068 | struct l2cap_chan *chan, |
4069 | u16 icid, u16 result) | |
8d5a04a1 MM |
4070 | { |
4071 | struct l2cap_move_chan_cfm cfm; | |
4072 | u8 ident; | |
4073 | ||
ad0ac6ca | 4074 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4075 | |
4076 | ident = l2cap_get_ident(conn); | |
4077 | if (chan) | |
4078 | chan->ident = ident; | |
4079 | ||
4080 | cfm.icid = cpu_to_le16(icid); | |
4081 | cfm.result = cpu_to_le16(result); | |
4082 | ||
4083 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4084 | } | |
4085 | ||
4086 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4087 | u16 icid) |
8d5a04a1 MM |
4088 | { |
4089 | struct l2cap_move_chan_cfm_rsp rsp; | |
4090 | ||
ad0ac6ca | 4091 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4092 | |
4093 | rsp.icid = cpu_to_le16(icid); | |
4094 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4095 | } | |
4096 | ||
4097 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4098 | struct l2cap_cmd_hdr *cmd, |
4099 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4100 | { |
4101 | struct l2cap_move_chan_req *req = data; | |
4102 | u16 icid = 0; | |
4103 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4104 | ||
4105 | if (cmd_len != sizeof(*req)) | |
4106 | return -EPROTO; | |
4107 | ||
4108 | icid = le16_to_cpu(req->icid); | |
4109 | ||
ad0ac6ca | 4110 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4111 | |
4112 | if (!enable_hs) | |
4113 | return -EINVAL; | |
4114 | ||
4115 | /* Placeholder: Always refuse */ | |
4116 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4117 | ||
4118 | return 0; | |
4119 | } | |
4120 | ||
4121 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4122 | struct l2cap_cmd_hdr *cmd, |
4123 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4124 | { |
4125 | struct l2cap_move_chan_rsp *rsp = data; | |
4126 | u16 icid, result; | |
4127 | ||
4128 | if (cmd_len != sizeof(*rsp)) | |
4129 | return -EPROTO; | |
4130 | ||
4131 | icid = le16_to_cpu(rsp->icid); | |
4132 | result = le16_to_cpu(rsp->result); | |
4133 | ||
ad0ac6ca | 4134 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4135 | |
4136 | /* Placeholder: Always unconfirmed */ | |
4137 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4138 | ||
4139 | return 0; | |
4140 | } | |
4141 | ||
4142 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4143 | struct l2cap_cmd_hdr *cmd, |
4144 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4145 | { |
4146 | struct l2cap_move_chan_cfm *cfm = data; | |
4147 | u16 icid, result; | |
4148 | ||
4149 | if (cmd_len != sizeof(*cfm)) | |
4150 | return -EPROTO; | |
4151 | ||
4152 | icid = le16_to_cpu(cfm->icid); | |
4153 | result = le16_to_cpu(cfm->result); | |
4154 | ||
ad0ac6ca | 4155 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4156 | |
4157 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4158 | ||
4159 | return 0; | |
4160 | } | |
4161 | ||
4162 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4163 | struct l2cap_cmd_hdr *cmd, |
4164 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4165 | { |
4166 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4167 | u16 icid; | |
4168 | ||
4169 | if (cmd_len != sizeof(*rsp)) | |
4170 | return -EPROTO; | |
4171 | ||
4172 | icid = le16_to_cpu(rsp->icid); | |
4173 | ||
ad0ac6ca | 4174 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4175 | |
4176 | return 0; | |
4177 | } | |
4178 | ||
e2174ca4 | 4179 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 4180 | u16 to_multiplier) |
de73115a CT |
4181 | { |
4182 | u16 max_latency; | |
4183 | ||
4184 | if (min > max || min < 6 || max > 3200) | |
4185 | return -EINVAL; | |
4186 | ||
4187 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4188 | return -EINVAL; | |
4189 | ||
4190 | if (max >= to_multiplier * 8) | |
4191 | return -EINVAL; | |
4192 | ||
4193 | max_latency = (to_multiplier * 8 / max) - 1; | |
4194 | if (latency > 499 || latency > max_latency) | |
4195 | return -EINVAL; | |
4196 | ||
4197 | return 0; | |
4198 | } | |
4199 | ||
4200 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
4201 | struct l2cap_cmd_hdr *cmd, |
4202 | u8 *data) | |
de73115a CT |
4203 | { |
4204 | struct hci_conn *hcon = conn->hcon; | |
4205 | struct l2cap_conn_param_update_req *req; | |
4206 | struct l2cap_conn_param_update_rsp rsp; | |
4207 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4208 | int err; |
de73115a CT |
4209 | |
4210 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4211 | return -EINVAL; | |
4212 | ||
4213 | cmd_len = __le16_to_cpu(cmd->len); | |
4214 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4215 | return -EPROTO; | |
4216 | ||
4217 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4218 | min = __le16_to_cpu(req->min); |
4219 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4220 | latency = __le16_to_cpu(req->latency); |
4221 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4222 | ||
4223 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 4224 | min, max, latency, to_multiplier); |
de73115a CT |
4225 | |
4226 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4227 | |
4228 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4229 | if (err) | |
ac73498c | 4230 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4231 | else |
ac73498c | 4232 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4233 | |
4234 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 4235 | sizeof(rsp), &rsp); |
de73115a | 4236 | |
2ce603eb CT |
4237 | if (!err) |
4238 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4239 | ||
de73115a CT |
4240 | return 0; |
4241 | } | |
4242 | ||
3300d9a9 | 4243 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
4244 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4245 | u8 *data) | |
3300d9a9 CT |
4246 | { |
4247 | int err = 0; | |
4248 | ||
4249 | switch (cmd->code) { | |
4250 | case L2CAP_COMMAND_REJ: | |
4251 | l2cap_command_rej(conn, cmd, data); | |
4252 | break; | |
4253 | ||
4254 | case L2CAP_CONN_REQ: | |
4255 | err = l2cap_connect_req(conn, cmd, data); | |
4256 | break; | |
4257 | ||
4258 | case L2CAP_CONN_RSP: | |
f5a2598d | 4259 | case L2CAP_CREATE_CHAN_RSP: |
3300d9a9 CT |
4260 | err = l2cap_connect_rsp(conn, cmd, data); |
4261 | break; | |
4262 | ||
4263 | case L2CAP_CONF_REQ: | |
4264 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4265 | break; | |
4266 | ||
4267 | case L2CAP_CONF_RSP: | |
4268 | err = l2cap_config_rsp(conn, cmd, data); | |
4269 | break; | |
4270 | ||
4271 | case L2CAP_DISCONN_REQ: | |
4272 | err = l2cap_disconnect_req(conn, cmd, data); | |
4273 | break; | |
4274 | ||
4275 | case L2CAP_DISCONN_RSP: | |
4276 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4277 | break; | |
4278 | ||
4279 | case L2CAP_ECHO_REQ: | |
4280 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4281 | break; | |
4282 | ||
4283 | case L2CAP_ECHO_RSP: | |
4284 | break; | |
4285 | ||
4286 | case L2CAP_INFO_REQ: | |
4287 | err = l2cap_information_req(conn, cmd, data); | |
4288 | break; | |
4289 | ||
4290 | case L2CAP_INFO_RSP: | |
4291 | err = l2cap_information_rsp(conn, cmd, data); | |
4292 | break; | |
4293 | ||
f94ff6ff MM |
4294 | case L2CAP_CREATE_CHAN_REQ: |
4295 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4296 | break; | |
4297 | ||
8d5a04a1 MM |
4298 | case L2CAP_MOVE_CHAN_REQ: |
4299 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4300 | break; | |
4301 | ||
4302 | case L2CAP_MOVE_CHAN_RSP: | |
4303 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4304 | break; | |
4305 | ||
4306 | case L2CAP_MOVE_CHAN_CFM: | |
4307 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4308 | break; | |
4309 | ||
4310 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4311 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4312 | break; | |
4313 | ||
3300d9a9 CT |
4314 | default: |
4315 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4316 | err = -EINVAL; | |
4317 | break; | |
4318 | } | |
4319 | ||
4320 | return err; | |
4321 | } | |
4322 | ||
4323 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 4324 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
4325 | { |
4326 | switch (cmd->code) { | |
4327 | case L2CAP_COMMAND_REJ: | |
4328 | return 0; | |
4329 | ||
4330 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4331 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4332 | |
4333 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4334 | return 0; | |
4335 | ||
4336 | default: | |
4337 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4338 | return -EINVAL; | |
4339 | } | |
4340 | } | |
4341 | ||
4342 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2d792818 | 4343 | struct sk_buff *skb) |
1da177e4 LT |
4344 | { |
4345 | u8 *data = skb->data; | |
4346 | int len = skb->len; | |
4347 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4348 | int err; |
1da177e4 LT |
4349 | |
4350 | l2cap_raw_recv(conn, skb); | |
4351 | ||
4352 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4353 | u16 cmd_len; |
1da177e4 LT |
4354 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4355 | data += L2CAP_CMD_HDR_SIZE; | |
4356 | len -= L2CAP_CMD_HDR_SIZE; | |
4357 | ||
88219a0f | 4358 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4359 | |
2d792818 GP |
4360 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
4361 | cmd.ident); | |
1da177e4 | 4362 | |
88219a0f | 4363 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4364 | BT_DBG("corrupted command"); |
4365 | break; | |
4366 | } | |
4367 | ||
3300d9a9 CT |
4368 | if (conn->hcon->type == LE_LINK) |
4369 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4370 | else | |
4371 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4372 | |
4373 | if (err) { | |
e2fd318e | 4374 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4375 | |
4376 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4377 | |
4378 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4379 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
4380 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
4381 | sizeof(rej), &rej); | |
1da177e4 LT |
4382 | } |
4383 | ||
88219a0f AV |
4384 | data += cmd_len; |
4385 | len -= cmd_len; | |
1da177e4 LT |
4386 | } |
4387 | ||
4388 | kfree_skb(skb); | |
4389 | } | |
4390 | ||
47d1ec61 | 4391 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4392 | { |
4393 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4394 | int hdr_size; |
4395 | ||
4396 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4397 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4398 | else | |
4399 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4400 | |
47d1ec61 | 4401 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4402 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4403 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4404 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4405 | ||
4406 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4407 | return -EBADMSG; |
fcc203c3 GP |
4408 | } |
4409 | return 0; | |
4410 | } | |
4411 | ||
6ea00485 | 4412 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4413 | { |
e31f7633 | 4414 | struct l2cap_ctrl control; |
d5392c8f | 4415 | |
e31f7633 | 4416 | BT_DBG("chan %p", chan); |
d5392c8f | 4417 | |
e31f7633 MM |
4418 | memset(&control, 0, sizeof(control)); |
4419 | control.sframe = 1; | |
4420 | control.final = 1; | |
4421 | control.reqseq = chan->buffer_seq; | |
4422 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4423 | |
e2ab4353 | 4424 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4425 | control.super = L2CAP_SUPER_RNR; |
4426 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4427 | } |
4428 | ||
e31f7633 MM |
4429 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4430 | chan->unacked_frames > 0) | |
4431 | __set_retrans_timer(chan); | |
d5392c8f | 4432 | |
e31f7633 | 4433 | /* Send pending iframes */ |
525cd185 | 4434 | l2cap_ertm_send(chan); |
d5392c8f | 4435 | |
e2ab4353 | 4436 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4437 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4438 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4439 | * send it now. | |
4440 | */ | |
4441 | control.super = L2CAP_SUPER_RR; | |
4442 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4443 | } |
4444 | } | |
4445 | ||
2d792818 GP |
4446 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
4447 | struct sk_buff **last_frag) | |
18778a63 | 4448 | { |
84084a31 MM |
4449 | /* skb->len reflects data in skb as well as all fragments |
4450 | * skb->data_len reflects only data in fragments | |
4451 | */ | |
4452 | if (!skb_has_frag_list(skb)) | |
4453 | skb_shinfo(skb)->frag_list = new_frag; | |
4454 | ||
4455 | new_frag->next = NULL; | |
4456 | ||
4457 | (*last_frag)->next = new_frag; | |
4458 | *last_frag = new_frag; | |
4459 | ||
4460 | skb->len += new_frag->len; | |
4461 | skb->data_len += new_frag->len; | |
4462 | skb->truesize += new_frag->truesize; | |
4463 | } | |
4464 | ||
4b51dae9 MM |
4465 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4466 | struct l2cap_ctrl *control) | |
84084a31 MM |
4467 | { |
4468 | int err = -EINVAL; | |
18778a63 | 4469 | |
4b51dae9 | 4470 | switch (control->sar) { |
7e0ef6ee | 4471 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4472 | if (chan->sdu) |
4473 | break; | |
18778a63 | 4474 | |
80b98027 | 4475 | err = chan->ops->recv(chan, skb); |
84084a31 | 4476 | break; |
18778a63 | 4477 | |
7e0ef6ee | 4478 | case L2CAP_SAR_START: |
84084a31 MM |
4479 | if (chan->sdu) |
4480 | break; | |
18778a63 | 4481 | |
6f61fd47 | 4482 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4483 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4484 | |
84084a31 MM |
4485 | if (chan->sdu_len > chan->imtu) { |
4486 | err = -EMSGSIZE; | |
4487 | break; | |
4488 | } | |
1890d36b | 4489 | |
84084a31 MM |
4490 | if (skb->len >= chan->sdu_len) |
4491 | break; | |
18778a63 | 4492 | |
84084a31 MM |
4493 | chan->sdu = skb; |
4494 | chan->sdu_last_frag = skb; | |
18778a63 | 4495 | |
84084a31 MM |
4496 | skb = NULL; |
4497 | err = 0; | |
18778a63 GP |
4498 | break; |
4499 | ||
7e0ef6ee | 4500 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4501 | if (!chan->sdu) |
84084a31 | 4502 | break; |
18778a63 | 4503 | |
84084a31 MM |
4504 | append_skb_frag(chan->sdu, skb, |
4505 | &chan->sdu_last_frag); | |
4506 | skb = NULL; | |
18778a63 | 4507 | |
84084a31 MM |
4508 | if (chan->sdu->len >= chan->sdu_len) |
4509 | break; | |
4178ba46 | 4510 | |
84084a31 | 4511 | err = 0; |
18778a63 GP |
4512 | break; |
4513 | ||
7e0ef6ee | 4514 | case L2CAP_SAR_END: |
6f61fd47 | 4515 | if (!chan->sdu) |
84084a31 | 4516 | break; |
18778a63 | 4517 | |
84084a31 MM |
4518 | append_skb_frag(chan->sdu, skb, |
4519 | &chan->sdu_last_frag); | |
4520 | skb = NULL; | |
4178ba46 | 4521 | |
84084a31 MM |
4522 | if (chan->sdu->len != chan->sdu_len) |
4523 | break; | |
18778a63 | 4524 | |
80b98027 | 4525 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4526 | |
84084a31 MM |
4527 | if (!err) { |
4528 | /* Reassembly complete */ | |
4529 | chan->sdu = NULL; | |
4530 | chan->sdu_last_frag = NULL; | |
4531 | chan->sdu_len = 0; | |
1890d36b | 4532 | } |
18778a63 GP |
4533 | break; |
4534 | } | |
4535 | ||
84084a31 MM |
4536 | if (err) { |
4537 | kfree_skb(skb); | |
4538 | kfree_skb(chan->sdu); | |
4539 | chan->sdu = NULL; | |
4540 | chan->sdu_last_frag = NULL; | |
4541 | chan->sdu_len = 0; | |
4542 | } | |
18778a63 | 4543 | |
84084a31 | 4544 | return err; |
18778a63 GP |
4545 | } |
4546 | ||
61aa4f5b | 4547 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4548 | { |
61aa4f5b | 4549 | u8 event; |
712132eb | 4550 | |
61aa4f5b MM |
4551 | if (chan->mode != L2CAP_MODE_ERTM) |
4552 | return; | |
712132eb | 4553 | |
61aa4f5b | 4554 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4555 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4556 | } |
4557 | ||
d2a7ac5d MM |
4558 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4559 | { | |
63838725 MM |
4560 | int err = 0; |
4561 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4562 | * until a gap is encountered. | |
4563 | */ | |
4564 | ||
4565 | BT_DBG("chan %p", chan); | |
4566 | ||
4567 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4568 | struct sk_buff *skb; | |
4569 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4570 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4571 | ||
4572 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4573 | ||
4574 | if (!skb) | |
4575 | break; | |
4576 | ||
4577 | skb_unlink(skb, &chan->srej_q); | |
4578 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4579 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4580 | if (err) | |
4581 | break; | |
4582 | } | |
4583 | ||
4584 | if (skb_queue_empty(&chan->srej_q)) { | |
4585 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4586 | l2cap_send_ack(chan); | |
4587 | } | |
4588 | ||
4589 | return err; | |
d2a7ac5d MM |
4590 | } |
4591 | ||
4592 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4593 | struct l2cap_ctrl *control) | |
4594 | { | |
f80842a8 MM |
4595 | struct sk_buff *skb; |
4596 | ||
4597 | BT_DBG("chan %p, control %p", chan, control); | |
4598 | ||
4599 | if (control->reqseq == chan->next_tx_seq) { | |
4600 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4601 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4602 | return; | |
4603 | } | |
4604 | ||
4605 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4606 | ||
4607 | if (skb == NULL) { | |
4608 | BT_DBG("Seq %d not available for retransmission", | |
4609 | control->reqseq); | |
4610 | return; | |
4611 | } | |
4612 | ||
4613 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4614 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4615 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4616 | return; | |
4617 | } | |
4618 | ||
4619 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4620 | ||
4621 | if (control->poll) { | |
4622 | l2cap_pass_to_tx(chan, control); | |
4623 | ||
4624 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4625 | l2cap_retransmit(chan, control); | |
4626 | l2cap_ertm_send(chan); | |
4627 | ||
4628 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4629 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4630 | chan->srej_save_reqseq = control->reqseq; | |
4631 | } | |
4632 | } else { | |
4633 | l2cap_pass_to_tx_fbit(chan, control); | |
4634 | ||
4635 | if (control->final) { | |
4636 | if (chan->srej_save_reqseq != control->reqseq || | |
4637 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4638 | &chan->conn_state)) | |
4639 | l2cap_retransmit(chan, control); | |
4640 | } else { | |
4641 | l2cap_retransmit(chan, control); | |
4642 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4643 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4644 | chan->srej_save_reqseq = control->reqseq; | |
4645 | } | |
4646 | } | |
4647 | } | |
d2a7ac5d MM |
4648 | } |
4649 | ||
4650 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4651 | struct l2cap_ctrl *control) | |
4652 | { | |
fcd289df MM |
4653 | struct sk_buff *skb; |
4654 | ||
4655 | BT_DBG("chan %p, control %p", chan, control); | |
4656 | ||
4657 | if (control->reqseq == chan->next_tx_seq) { | |
4658 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4659 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4660 | return; | |
4661 | } | |
4662 | ||
4663 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4664 | ||
4665 | if (chan->max_tx && skb && | |
4666 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4667 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4668 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4669 | return; | |
4670 | } | |
4671 | ||
4672 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4673 | ||
4674 | l2cap_pass_to_tx(chan, control); | |
4675 | ||
4676 | if (control->final) { | |
4677 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4678 | l2cap_retransmit_all(chan, control); | |
4679 | } else { | |
4680 | l2cap_retransmit_all(chan, control); | |
4681 | l2cap_ertm_send(chan); | |
4682 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4683 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4684 | } | |
d2a7ac5d MM |
4685 | } |
4686 | ||
4b51dae9 MM |
4687 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4688 | { | |
4689 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4690 | ||
4691 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4692 | chan->expected_tx_seq); | |
4693 | ||
4694 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4695 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 4696 | chan->tx_win) { |
4b51dae9 MM |
4697 | /* See notes below regarding "double poll" and |
4698 | * invalid packets. | |
4699 | */ | |
4700 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4701 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4702 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4703 | } else { | |
4704 | BT_DBG("Invalid - in window after SREJ sent"); | |
4705 | return L2CAP_TXSEQ_INVALID; | |
4706 | } | |
4707 | } | |
4708 | ||
4709 | if (chan->srej_list.head == txseq) { | |
4710 | BT_DBG("Expected SREJ"); | |
4711 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4712 | } | |
4713 | ||
4714 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4715 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4716 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4717 | } | |
4718 | ||
4719 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4720 | BT_DBG("Unexpected SREJ - not requested"); | |
4721 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4722 | } | |
4723 | } | |
4724 | ||
4725 | if (chan->expected_tx_seq == txseq) { | |
4726 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4727 | chan->tx_win) { | |
4728 | BT_DBG("Invalid - txseq outside tx window"); | |
4729 | return L2CAP_TXSEQ_INVALID; | |
4730 | } else { | |
4731 | BT_DBG("Expected"); | |
4732 | return L2CAP_TXSEQ_EXPECTED; | |
4733 | } | |
4734 | } | |
4735 | ||
4736 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 4737 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
4738 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
4739 | return L2CAP_TXSEQ_DUPLICATE; | |
4740 | } | |
4741 | ||
4742 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4743 | /* A source of invalid packets is a "double poll" condition, | |
4744 | * where delays cause us to send multiple poll packets. If | |
4745 | * the remote stack receives and processes both polls, | |
4746 | * sequence numbers can wrap around in such a way that a | |
4747 | * resent frame has a sequence number that looks like new data | |
4748 | * with a sequence gap. This would trigger an erroneous SREJ | |
4749 | * request. | |
4750 | * | |
4751 | * Fortunately, this is impossible with a tx window that's | |
4752 | * less than half of the maximum sequence number, which allows | |
4753 | * invalid frames to be safely ignored. | |
4754 | * | |
4755 | * With tx window sizes greater than half of the tx window | |
4756 | * maximum, the frame is invalid and cannot be ignored. This | |
4757 | * causes a disconnect. | |
4758 | */ | |
4759 | ||
4760 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4761 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4762 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4763 | } else { | |
4764 | BT_DBG("Invalid - txseq outside tx window"); | |
4765 | return L2CAP_TXSEQ_INVALID; | |
4766 | } | |
4767 | } else { | |
4768 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4769 | return L2CAP_TXSEQ_UNEXPECTED; | |
4770 | } | |
4771 | } | |
4772 | ||
d2a7ac5d MM |
4773 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4774 | struct l2cap_ctrl *control, | |
4775 | struct sk_buff *skb, u8 event) | |
4776 | { | |
4777 | int err = 0; | |
4778 | bool skb_in_use = 0; | |
4779 | ||
4780 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4781 | event); | |
4782 | ||
4783 | switch (event) { | |
4784 | case L2CAP_EV_RECV_IFRAME: | |
4785 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4786 | case L2CAP_TXSEQ_EXPECTED: | |
4787 | l2cap_pass_to_tx(chan, control); | |
4788 | ||
4789 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4790 | BT_DBG("Busy, discarding expected seq %d", | |
4791 | control->txseq); | |
4792 | break; | |
4793 | } | |
4794 | ||
4795 | chan->expected_tx_seq = __next_seq(chan, | |
4796 | control->txseq); | |
4797 | ||
4798 | chan->buffer_seq = chan->expected_tx_seq; | |
4799 | skb_in_use = 1; | |
4800 | ||
4801 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4802 | if (err) | |
4803 | break; | |
4804 | ||
4805 | if (control->final) { | |
4806 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4807 | &chan->conn_state)) { | |
4808 | control->final = 0; | |
4809 | l2cap_retransmit_all(chan, control); | |
4810 | l2cap_ertm_send(chan); | |
4811 | } | |
4812 | } | |
4813 | ||
4814 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4815 | l2cap_send_ack(chan); | |
4816 | break; | |
4817 | case L2CAP_TXSEQ_UNEXPECTED: | |
4818 | l2cap_pass_to_tx(chan, control); | |
4819 | ||
4820 | /* Can't issue SREJ frames in the local busy state. | |
4821 | * Drop this frame, it will be seen as missing | |
4822 | * when local busy is exited. | |
4823 | */ | |
4824 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4825 | BT_DBG("Busy, discarding unexpected seq %d", | |
4826 | control->txseq); | |
4827 | break; | |
4828 | } | |
4829 | ||
4830 | /* There was a gap in the sequence, so an SREJ | |
4831 | * must be sent for each missing frame. The | |
4832 | * current frame is stored for later use. | |
4833 | */ | |
4834 | skb_queue_tail(&chan->srej_q, skb); | |
4835 | skb_in_use = 1; | |
4836 | BT_DBG("Queued %p (queue len %d)", skb, | |
4837 | skb_queue_len(&chan->srej_q)); | |
4838 | ||
4839 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4840 | l2cap_seq_list_clear(&chan->srej_list); | |
4841 | l2cap_send_srej(chan, control->txseq); | |
4842 | ||
4843 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4844 | break; | |
4845 | case L2CAP_TXSEQ_DUPLICATE: | |
4846 | l2cap_pass_to_tx(chan, control); | |
4847 | break; | |
4848 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4849 | break; | |
4850 | case L2CAP_TXSEQ_INVALID: | |
4851 | default: | |
4852 | l2cap_send_disconn_req(chan->conn, chan, | |
4853 | ECONNRESET); | |
4854 | break; | |
4855 | } | |
4856 | break; | |
4857 | case L2CAP_EV_RECV_RR: | |
4858 | l2cap_pass_to_tx(chan, control); | |
4859 | if (control->final) { | |
4860 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4861 | ||
4862 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4863 | &chan->conn_state)) { | |
4864 | control->final = 0; | |
4865 | l2cap_retransmit_all(chan, control); | |
4866 | } | |
4867 | ||
4868 | l2cap_ertm_send(chan); | |
4869 | } else if (control->poll) { | |
4870 | l2cap_send_i_or_rr_or_rnr(chan); | |
4871 | } else { | |
4872 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4873 | &chan->conn_state) && | |
4874 | chan->unacked_frames) | |
4875 | __set_retrans_timer(chan); | |
4876 | ||
4877 | l2cap_ertm_send(chan); | |
4878 | } | |
4879 | break; | |
4880 | case L2CAP_EV_RECV_RNR: | |
4881 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4882 | l2cap_pass_to_tx(chan, control); | |
4883 | if (control && control->poll) { | |
4884 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4885 | l2cap_send_rr_or_rnr(chan, 0); | |
4886 | } | |
4887 | __clear_retrans_timer(chan); | |
4888 | l2cap_seq_list_clear(&chan->retrans_list); | |
4889 | break; | |
4890 | case L2CAP_EV_RECV_REJ: | |
4891 | l2cap_handle_rej(chan, control); | |
4892 | break; | |
4893 | case L2CAP_EV_RECV_SREJ: | |
4894 | l2cap_handle_srej(chan, control); | |
4895 | break; | |
4896 | default: | |
4897 | break; | |
4898 | } | |
4899 | ||
4900 | if (skb && !skb_in_use) { | |
4901 | BT_DBG("Freeing %p", skb); | |
4902 | kfree_skb(skb); | |
4903 | } | |
4904 | ||
4905 | return err; | |
4906 | } | |
4907 | ||
4908 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4909 | struct l2cap_ctrl *control, | |
4910 | struct sk_buff *skb, u8 event) | |
4911 | { | |
4912 | int err = 0; | |
4913 | u16 txseq = control->txseq; | |
4914 | bool skb_in_use = 0; | |
4915 | ||
4916 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4917 | event); | |
4918 | ||
4919 | switch (event) { | |
4920 | case L2CAP_EV_RECV_IFRAME: | |
4921 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4922 | case L2CAP_TXSEQ_EXPECTED: | |
4923 | /* Keep frame for reassembly later */ | |
4924 | l2cap_pass_to_tx(chan, control); | |
4925 | skb_queue_tail(&chan->srej_q, skb); | |
4926 | skb_in_use = 1; | |
4927 | BT_DBG("Queued %p (queue len %d)", skb, | |
4928 | skb_queue_len(&chan->srej_q)); | |
4929 | ||
4930 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4931 | break; | |
4932 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4933 | l2cap_seq_list_pop(&chan->srej_list); | |
4934 | ||
4935 | l2cap_pass_to_tx(chan, control); | |
4936 | skb_queue_tail(&chan->srej_q, skb); | |
4937 | skb_in_use = 1; | |
4938 | BT_DBG("Queued %p (queue len %d)", skb, | |
4939 | skb_queue_len(&chan->srej_q)); | |
4940 | ||
4941 | err = l2cap_rx_queued_iframes(chan); | |
4942 | if (err) | |
4943 | break; | |
4944 | ||
4945 | break; | |
4946 | case L2CAP_TXSEQ_UNEXPECTED: | |
4947 | /* Got a frame that can't be reassembled yet. | |
4948 | * Save it for later, and send SREJs to cover | |
4949 | * the missing frames. | |
4950 | */ | |
4951 | skb_queue_tail(&chan->srej_q, skb); | |
4952 | skb_in_use = 1; | |
4953 | BT_DBG("Queued %p (queue len %d)", skb, | |
4954 | skb_queue_len(&chan->srej_q)); | |
4955 | ||
4956 | l2cap_pass_to_tx(chan, control); | |
4957 | l2cap_send_srej(chan, control->txseq); | |
4958 | break; | |
4959 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4960 | /* This frame was requested with an SREJ, but | |
4961 | * some expected retransmitted frames are | |
4962 | * missing. Request retransmission of missing | |
4963 | * SREJ'd frames. | |
4964 | */ | |
4965 | skb_queue_tail(&chan->srej_q, skb); | |
4966 | skb_in_use = 1; | |
4967 | BT_DBG("Queued %p (queue len %d)", skb, | |
4968 | skb_queue_len(&chan->srej_q)); | |
4969 | ||
4970 | l2cap_pass_to_tx(chan, control); | |
4971 | l2cap_send_srej_list(chan, control->txseq); | |
4972 | break; | |
4973 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4974 | /* We've already queued this frame. Drop this copy. */ | |
4975 | l2cap_pass_to_tx(chan, control); | |
4976 | break; | |
4977 | case L2CAP_TXSEQ_DUPLICATE: | |
4978 | /* Expecting a later sequence number, so this frame | |
4979 | * was already received. Ignore it completely. | |
4980 | */ | |
4981 | break; | |
4982 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4983 | break; | |
4984 | case L2CAP_TXSEQ_INVALID: | |
4985 | default: | |
4986 | l2cap_send_disconn_req(chan->conn, chan, | |
4987 | ECONNRESET); | |
4988 | break; | |
4989 | } | |
4990 | break; | |
4991 | case L2CAP_EV_RECV_RR: | |
4992 | l2cap_pass_to_tx(chan, control); | |
4993 | if (control->final) { | |
4994 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4995 | ||
4996 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4997 | &chan->conn_state)) { | |
4998 | control->final = 0; | |
4999 | l2cap_retransmit_all(chan, control); | |
5000 | } | |
5001 | ||
5002 | l2cap_ertm_send(chan); | |
5003 | } else if (control->poll) { | |
5004 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5005 | &chan->conn_state) && | |
5006 | chan->unacked_frames) { | |
5007 | __set_retrans_timer(chan); | |
5008 | } | |
5009 | ||
5010 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5011 | l2cap_send_srej_tail(chan); | |
5012 | } else { | |
5013 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5014 | &chan->conn_state) && | |
5015 | chan->unacked_frames) | |
5016 | __set_retrans_timer(chan); | |
5017 | ||
5018 | l2cap_send_ack(chan); | |
5019 | } | |
5020 | break; | |
5021 | case L2CAP_EV_RECV_RNR: | |
5022 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5023 | l2cap_pass_to_tx(chan, control); | |
5024 | if (control->poll) { | |
5025 | l2cap_send_srej_tail(chan); | |
5026 | } else { | |
5027 | struct l2cap_ctrl rr_control; | |
5028 | memset(&rr_control, 0, sizeof(rr_control)); | |
5029 | rr_control.sframe = 1; | |
5030 | rr_control.super = L2CAP_SUPER_RR; | |
5031 | rr_control.reqseq = chan->buffer_seq; | |
5032 | l2cap_send_sframe(chan, &rr_control); | |
5033 | } | |
5034 | ||
5035 | break; | |
5036 | case L2CAP_EV_RECV_REJ: | |
5037 | l2cap_handle_rej(chan, control); | |
5038 | break; | |
5039 | case L2CAP_EV_RECV_SREJ: | |
5040 | l2cap_handle_srej(chan, control); | |
5041 | break; | |
5042 | } | |
5043 | ||
5044 | if (skb && !skb_in_use) { | |
5045 | BT_DBG("Freeing %p", skb); | |
5046 | kfree_skb(skb); | |
5047 | } | |
5048 | ||
5049 | return err; | |
5050 | } | |
5051 | ||
5052 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5053 | { | |
5054 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5055 | u16 unacked; | |
5056 | ||
5057 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5058 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5059 | } | |
5060 | ||
cec8ab6e MM |
5061 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5062 | struct sk_buff *skb, u8 event) | |
218bb9df | 5063 | { |
d2a7ac5d MM |
5064 | int err = 0; |
5065 | ||
5066 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5067 | control, skb, event, chan->rx_state); | |
5068 | ||
5069 | if (__valid_reqseq(chan, control->reqseq)) { | |
5070 | switch (chan->rx_state) { | |
5071 | case L2CAP_RX_STATE_RECV: | |
5072 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5073 | break; | |
5074 | case L2CAP_RX_STATE_SREJ_SENT: | |
5075 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5076 | event); | |
5077 | break; | |
5078 | default: | |
5079 | /* shut it down */ | |
5080 | break; | |
5081 | } | |
5082 | } else { | |
5083 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5084 | control->reqseq, chan->next_tx_seq, | |
5085 | chan->expected_ack_seq); | |
5086 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5087 | } | |
5088 | ||
5089 | return err; | |
cec8ab6e MM |
5090 | } |
5091 | ||
5092 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5093 | struct sk_buff *skb) | |
5094 | { | |
4b51dae9 MM |
5095 | int err = 0; |
5096 | ||
5097 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5098 | chan->rx_state); | |
5099 | ||
5100 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5101 | L2CAP_TXSEQ_EXPECTED) { | |
5102 | l2cap_pass_to_tx(chan, control); | |
5103 | ||
5104 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5105 | __next_seq(chan, chan->buffer_seq)); | |
5106 | ||
5107 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5108 | ||
5109 | l2cap_reassemble_sdu(chan, skb, control); | |
5110 | } else { | |
5111 | if (chan->sdu) { | |
5112 | kfree_skb(chan->sdu); | |
5113 | chan->sdu = NULL; | |
5114 | } | |
5115 | chan->sdu_last_frag = NULL; | |
5116 | chan->sdu_len = 0; | |
5117 | ||
5118 | if (skb) { | |
5119 | BT_DBG("Freeing %p", skb); | |
5120 | kfree_skb(skb); | |
5121 | } | |
5122 | } | |
5123 | ||
5124 | chan->last_acked_seq = control->txseq; | |
5125 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5126 | ||
5127 | return err; | |
cec8ab6e MM |
5128 | } |
5129 | ||
5130 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5131 | { | |
5132 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5133 | u16 len; | |
5134 | u8 event; | |
218bb9df | 5135 | |
b76bbd66 MM |
5136 | __unpack_control(chan, skb); |
5137 | ||
218bb9df GP |
5138 | len = skb->len; |
5139 | ||
5140 | /* | |
5141 | * We can just drop the corrupted I-frame here. | |
5142 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5143 | * procedures and ask for retransmission. |
218bb9df | 5144 | */ |
47d1ec61 | 5145 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5146 | goto drop; |
5147 | ||
cec8ab6e | 5148 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5149 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5150 | |
47d1ec61 | 5151 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5152 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5153 | |
47d1ec61 | 5154 | if (len > chan->mps) { |
8c1d787b | 5155 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5156 | goto drop; |
5157 | } | |
5158 | ||
cec8ab6e MM |
5159 | if (!control->sframe) { |
5160 | int err; | |
218bb9df | 5161 | |
cec8ab6e MM |
5162 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5163 | control->sar, control->reqseq, control->final, | |
5164 | control->txseq); | |
218bb9df | 5165 | |
cec8ab6e MM |
5166 | /* Validate F-bit - F=0 always valid, F=1 only |
5167 | * valid in TX WAIT_F | |
5168 | */ | |
5169 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5170 | goto drop; |
cec8ab6e MM |
5171 | |
5172 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5173 | event = L2CAP_EV_RECV_IFRAME; | |
5174 | err = l2cap_rx(chan, control, skb, event); | |
5175 | } else { | |
5176 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5177 | } |
5178 | ||
cec8ab6e MM |
5179 | if (err) |
5180 | l2cap_send_disconn_req(chan->conn, chan, | |
5181 | ECONNRESET); | |
218bb9df | 5182 | } else { |
cec8ab6e MM |
5183 | const u8 rx_func_to_event[4] = { |
5184 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5185 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5186 | }; | |
5187 | ||
5188 | /* Only I-frames are expected in streaming mode */ | |
5189 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5190 | goto drop; | |
5191 | ||
5192 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5193 | control->reqseq, control->final, control->poll, | |
5194 | control->super); | |
5195 | ||
218bb9df GP |
5196 | if (len != 0) { |
5197 | BT_ERR("%d", len); | |
8c1d787b | 5198 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5199 | goto drop; |
5200 | } | |
5201 | ||
cec8ab6e MM |
5202 | /* Validate F and P bits */ |
5203 | if (control->final && (control->poll || | |
5204 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5205 | goto drop; | |
5206 | ||
5207 | event = rx_func_to_event[control->super]; | |
5208 | if (l2cap_rx(chan, control, skb, event)) | |
5209 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5210 | } |
5211 | ||
5212 | return 0; | |
5213 | ||
5214 | drop: | |
5215 | kfree_skb(skb); | |
5216 | return 0; | |
5217 | } | |
5218 | ||
13ca56e0 AE |
5219 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5220 | struct sk_buff *skb) | |
1da177e4 | 5221 | { |
48454079 | 5222 | struct l2cap_chan *chan; |
1da177e4 | 5223 | |
baa7e1fa | 5224 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5225 | if (!chan) { |
97e8e89d AE |
5226 | if (cid == L2CAP_CID_A2MP) { |
5227 | chan = a2mp_channel_create(conn, skb); | |
5228 | if (!chan) { | |
5229 | kfree_skb(skb); | |
13ca56e0 | 5230 | return; |
97e8e89d AE |
5231 | } |
5232 | ||
5233 | l2cap_chan_lock(chan); | |
5234 | } else { | |
5235 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5236 | /* Drop packet and return */ | |
5237 | kfree_skb(skb); | |
13ca56e0 | 5238 | return; |
97e8e89d | 5239 | } |
1da177e4 LT |
5240 | } |
5241 | ||
49208c9c | 5242 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5243 | |
89bc500e | 5244 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5245 | goto drop; |
5246 | ||
0c1bc5c6 | 5247 | switch (chan->mode) { |
1c2acffb GP |
5248 | case L2CAP_MODE_BASIC: |
5249 | /* If socket recv buffers overflows we drop data here | |
5250 | * which is *bad* because L2CAP has to be reliable. | |
5251 | * But we don't have any other choice. L2CAP doesn't | |
5252 | * provide flow control mechanism. */ | |
1da177e4 | 5253 | |
0c1bc5c6 | 5254 | if (chan->imtu < skb->len) |
1c2acffb | 5255 | goto drop; |
1da177e4 | 5256 | |
80b98027 | 5257 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5258 | goto done; |
5259 | break; | |
5260 | ||
5261 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5262 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5263 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5264 | goto done; |
5265 | ||
1c2acffb | 5266 | default: |
0c1bc5c6 | 5267 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5268 | break; |
5269 | } | |
1da177e4 LT |
5270 | |
5271 | drop: | |
5272 | kfree_skb(skb); | |
5273 | ||
5274 | done: | |
6be36555 | 5275 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5276 | } |
5277 | ||
84104b24 AE |
5278 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5279 | struct sk_buff *skb) | |
1da177e4 | 5280 | { |
23691d75 | 5281 | struct l2cap_chan *chan; |
1da177e4 | 5282 | |
c2287681 | 5283 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5284 | if (!chan) |
1da177e4 LT |
5285 | goto drop; |
5286 | ||
5b4cedaa | 5287 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5288 | |
89bc500e | 5289 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5290 | goto drop; |
5291 | ||
e13e21dc | 5292 | if (chan->imtu < skb->len) |
1da177e4 LT |
5293 | goto drop; |
5294 | ||
80b98027 | 5295 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5296 | return; |
1da177e4 LT |
5297 | |
5298 | drop: | |
5299 | kfree_skb(skb); | |
1da177e4 LT |
5300 | } |
5301 | ||
6810fca7 AE |
5302 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5303 | struct sk_buff *skb) | |
9f69bda6 | 5304 | { |
23691d75 | 5305 | struct l2cap_chan *chan; |
9f69bda6 | 5306 | |
c2287681 | 5307 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5308 | if (!chan) |
9f69bda6 GP |
5309 | goto drop; |
5310 | ||
5b4cedaa | 5311 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5312 | |
89bc500e | 5313 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5314 | goto drop; |
5315 | ||
e13e21dc | 5316 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5317 | goto drop; |
5318 | ||
80b98027 | 5319 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5320 | return; |
9f69bda6 GP |
5321 | |
5322 | drop: | |
5323 | kfree_skb(skb); | |
9f69bda6 GP |
5324 | } |
5325 | ||
1da177e4 LT |
5326 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5327 | { | |
5328 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5329 | u16 cid, len; |
5330 | __le16 psm; | |
1da177e4 LT |
5331 | |
5332 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5333 | cid = __le16_to_cpu(lh->cid); | |
5334 | len = __le16_to_cpu(lh->len); | |
5335 | ||
1c2acffb GP |
5336 | if (len != skb->len) { |
5337 | kfree_skb(skb); | |
5338 | return; | |
5339 | } | |
5340 | ||
1da177e4 LT |
5341 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5342 | ||
5343 | switch (cid) { | |
3300d9a9 | 5344 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5345 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5346 | l2cap_sig_channel(conn, skb); |
5347 | break; | |
5348 | ||
8db4dc46 | 5349 | case L2CAP_CID_CONN_LESS: |
097db76c | 5350 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5351 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5352 | l2cap_conless_channel(conn, psm, skb); |
5353 | break; | |
5354 | ||
9f69bda6 GP |
5355 | case L2CAP_CID_LE_DATA: |
5356 | l2cap_att_channel(conn, cid, skb); | |
5357 | break; | |
5358 | ||
b501d6a1 AB |
5359 | case L2CAP_CID_SMP: |
5360 | if (smp_sig_channel(conn, skb)) | |
5361 | l2cap_conn_del(conn->hcon, EACCES); | |
5362 | break; | |
5363 | ||
1da177e4 LT |
5364 | default: |
5365 | l2cap_data_channel(conn, cid, skb); | |
5366 | break; | |
5367 | } | |
5368 | } | |
5369 | ||
5370 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5371 | ||
686ebf28 | 5372 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5373 | { |
5374 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5375 | struct l2cap_chan *c; |
1da177e4 | 5376 | |
6ed93dc6 | 5377 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
5378 | |
5379 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5380 | read_lock(&chan_list_lock); |
5381 | list_for_each_entry(c, &chan_list, global_l) { | |
5382 | struct sock *sk = c->sk; | |
4343478f | 5383 | |
89bc500e | 5384 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5385 | continue; |
5386 | ||
5387 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5388 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5389 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5390 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5391 | exact++; |
2af6b9d5 MH |
5392 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5393 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5394 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5395 | lm2 |= HCI_LM_MASTER; |
5396 | } | |
1da177e4 | 5397 | } |
23691d75 | 5398 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5399 | |
5400 | return exact ? lm1 : lm2; | |
5401 | } | |
5402 | ||
9e664631 | 5403 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5404 | { |
0139418c MH |
5405 | struct l2cap_conn *conn; |
5406 | ||
6ed93dc6 | 5407 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 5408 | |
1da177e4 | 5409 | if (!status) { |
1da177e4 LT |
5410 | conn = l2cap_conn_add(hcon, status); |
5411 | if (conn) | |
5412 | l2cap_conn_ready(conn); | |
0139418c | 5413 | } else |
e175072f | 5414 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 | 5415 | |
1da177e4 LT |
5416 | } |
5417 | ||
686ebf28 | 5418 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5419 | { |
5420 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5421 | ||
5422 | BT_DBG("hcon %p", hcon); | |
5423 | ||
686ebf28 | 5424 | if (!conn) |
9f5a0d7b | 5425 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5426 | return conn->disc_reason; |
5427 | } | |
5428 | ||
9e664631 | 5429 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5430 | { |
5431 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5432 | ||
e175072f | 5433 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5434 | } |
5435 | ||
4343478f | 5436 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5437 | { |
715ec005 | 5438 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5439 | return; |
5440 | ||
f62e4323 | 5441 | if (encrypt == 0x00) { |
4343478f | 5442 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5443 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5444 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5445 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5446 | } else { |
4343478f | 5447 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5448 | __clear_chan_timer(chan); |
f62e4323 MH |
5449 | } |
5450 | } | |
5451 | ||
686ebf28 | 5452 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5453 | { |
0139418c | 5454 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5455 | struct l2cap_chan *chan; |
1da177e4 | 5456 | |
0139418c | 5457 | if (!conn) |
1da177e4 | 5458 | return 0; |
0139418c | 5459 | |
89d8b407 | 5460 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 5461 | |
160dc6ac | 5462 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5463 | if (!status && encrypt) |
5464 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5465 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5466 | } |
5467 | ||
3df91ea2 | 5468 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5469 | |
3df91ea2 | 5470 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5471 | l2cap_chan_lock(chan); |
1da177e4 | 5472 | |
89d8b407 AE |
5473 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
5474 | state_to_string(chan->state)); | |
f1cb9af5 | 5475 | |
78eb2f98 AE |
5476 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
5477 | l2cap_chan_unlock(chan); | |
5478 | continue; | |
5479 | } | |
5480 | ||
f1cb9af5 VCG |
5481 | if (chan->scid == L2CAP_CID_LE_DATA) { |
5482 | if (!status && encrypt) { | |
5483 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5484 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5485 | } |
5486 | ||
6be36555 | 5487 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5488 | continue; |
5489 | } | |
5490 | ||
c1360a1c | 5491 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5492 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5493 | continue; |
5494 | } | |
5495 | ||
89bc500e | 5496 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 5497 | chan->state == BT_CONFIG)) { |
a7d7723a GP |
5498 | struct sock *sk = chan->sk; |
5499 | ||
c5daa683 | 5500 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5501 | sk->sk_state_change(sk); |
5502 | ||
4343478f | 5503 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5504 | l2cap_chan_unlock(chan); |
9719f8af MH |
5505 | continue; |
5506 | } | |
5507 | ||
89bc500e | 5508 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5509 | if (!status) { |
93c3e8f5 | 5510 | l2cap_start_connection(chan); |
b1235d79 | 5511 | } else { |
ba13ccd9 | 5512 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5513 | } |
89bc500e | 5514 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5515 | struct sock *sk = chan->sk; |
b1235d79 | 5516 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5517 | __u16 res, stat; |
1da177e4 | 5518 | |
6be36555 AE |
5519 | lock_sock(sk); |
5520 | ||
b1235d79 | 5521 | if (!status) { |
c5daa683 GP |
5522 | if (test_bit(BT_SK_DEFER_SETUP, |
5523 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5524 | res = L2CAP_CR_PEND; |
5525 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 5526 | chan->ops->defer(chan); |
df3c3931 | 5527 | } else { |
0e587be7 | 5528 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5529 | res = L2CAP_CR_SUCCESS; |
5530 | stat = L2CAP_CS_NO_INFO; | |
5531 | } | |
b1235d79 | 5532 | } else { |
0e587be7 | 5533 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5534 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5535 | res = L2CAP_CR_SEC_BLOCK; |
5536 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5537 | } |
5538 | ||
6be36555 AE |
5539 | release_sock(sk); |
5540 | ||
fe4128e0 GP |
5541 | rsp.scid = cpu_to_le16(chan->dcid); |
5542 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5543 | rsp.result = cpu_to_le16(res); |
5544 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 5545 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 5546 | sizeof(rsp), &rsp); |
2d369359 MM |
5547 | |
5548 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5549 | res == L2CAP_CR_SUCCESS) { | |
5550 | char buf[128]; | |
5551 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5552 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5553 | L2CAP_CONF_REQ, | |
5554 | l2cap_build_conf_req(chan, buf), | |
5555 | buf); | |
5556 | chan->num_conf_req++; | |
5557 | } | |
b1235d79 | 5558 | } |
1da177e4 | 5559 | |
6be36555 | 5560 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5561 | } |
5562 | ||
3df91ea2 | 5563 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5564 | |
1da177e4 LT |
5565 | return 0; |
5566 | } | |
5567 | ||
686ebf28 | 5568 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5569 | { |
5570 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
5571 | struct l2cap_hdr *hdr; |
5572 | int len; | |
1da177e4 | 5573 | |
5a08ecce AE |
5574 | if (!conn) |
5575 | conn = l2cap_conn_add(hcon, 0); | |
5576 | ||
5577 | if (!conn) | |
1da177e4 LT |
5578 | goto drop; |
5579 | ||
5580 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5581 | ||
d73a0988 AE |
5582 | switch (flags) { |
5583 | case ACL_START: | |
5584 | case ACL_START_NO_FLUSH: | |
5585 | case ACL_COMPLETE: | |
1da177e4 LT |
5586 | if (conn->rx_len) { |
5587 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5588 | kfree_skb(conn->rx_skb); | |
5589 | conn->rx_skb = NULL; | |
5590 | conn->rx_len = 0; | |
5591 | l2cap_conn_unreliable(conn, ECOMM); | |
5592 | } | |
5593 | ||
aae7fe22 AE |
5594 | /* Start fragment always begin with Basic L2CAP header */ |
5595 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5596 | BT_ERR("Frame is too short (len %d)", skb->len); |
5597 | l2cap_conn_unreliable(conn, ECOMM); | |
5598 | goto drop; | |
5599 | } | |
5600 | ||
5601 | hdr = (struct l2cap_hdr *) skb->data; | |
5602 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5603 | ||
5604 | if (len == skb->len) { | |
5605 | /* Complete frame received */ | |
5606 | l2cap_recv_frame(conn, skb); | |
5607 | return 0; | |
5608 | } | |
5609 | ||
5610 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5611 | ||
5612 | if (skb->len > len) { | |
5613 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 5614 | skb->len, len); |
1da177e4 LT |
5615 | l2cap_conn_unreliable(conn, ECOMM); |
5616 | goto drop; | |
5617 | } | |
5618 | ||
5619 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 5620 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 5621 | if (!conn->rx_skb) |
1da177e4 LT |
5622 | goto drop; |
5623 | ||
d626f62b | 5624 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5625 | skb->len); |
1da177e4 | 5626 | conn->rx_len = len - skb->len; |
d73a0988 AE |
5627 | break; |
5628 | ||
5629 | case ACL_CONT: | |
1da177e4 LT |
5630 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
5631 | ||
5632 | if (!conn->rx_len) { | |
5633 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5634 | l2cap_conn_unreliable(conn, ECOMM); | |
5635 | goto drop; | |
5636 | } | |
5637 | ||
5638 | if (skb->len > conn->rx_len) { | |
5639 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 5640 | skb->len, conn->rx_len); |
1da177e4 LT |
5641 | kfree_skb(conn->rx_skb); |
5642 | conn->rx_skb = NULL; | |
5643 | conn->rx_len = 0; | |
5644 | l2cap_conn_unreliable(conn, ECOMM); | |
5645 | goto drop; | |
5646 | } | |
5647 | ||
d626f62b | 5648 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5649 | skb->len); |
1da177e4 LT |
5650 | conn->rx_len -= skb->len; |
5651 | ||
5652 | if (!conn->rx_len) { | |
5653 | /* Complete frame received */ | |
5654 | l2cap_recv_frame(conn, conn->rx_skb); | |
5655 | conn->rx_skb = NULL; | |
5656 | } | |
d73a0988 | 5657 | break; |
1da177e4 LT |
5658 | } |
5659 | ||
5660 | drop: | |
5661 | kfree_skb(skb); | |
5662 | return 0; | |
5663 | } | |
5664 | ||
aef7d97c | 5665 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5666 | { |
23691d75 | 5667 | struct l2cap_chan *c; |
1da177e4 | 5668 | |
333055f2 | 5669 | read_lock(&chan_list_lock); |
1da177e4 | 5670 | |
23691d75 GP |
5671 | list_for_each_entry(c, &chan_list, global_l) { |
5672 | struct sock *sk = c->sk; | |
101545f6 | 5673 | |
fcb73338 AE |
5674 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
5675 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
5676 | c->state, __le16_to_cpu(c->psm), | |
5677 | c->scid, c->dcid, c->imtu, c->omtu, | |
5678 | c->sec_level, c->mode); | |
61e1b4b7 | 5679 | } |
1da177e4 | 5680 | |
333055f2 | 5681 | read_unlock(&chan_list_lock); |
1da177e4 | 5682 | |
aef7d97c | 5683 | return 0; |
1da177e4 LT |
5684 | } |
5685 | ||
aef7d97c MH |
5686 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5687 | { | |
5688 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5689 | } | |
5690 | ||
5691 | static const struct file_operations l2cap_debugfs_fops = { | |
5692 | .open = l2cap_debugfs_open, | |
5693 | .read = seq_read, | |
5694 | .llseek = seq_lseek, | |
5695 | .release = single_release, | |
5696 | }; | |
5697 | ||
5698 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5699 | |
64274518 | 5700 | int __init l2cap_init(void) |
1da177e4 LT |
5701 | { |
5702 | int err; | |
be9d1227 | 5703 | |
bb58f747 | 5704 | err = l2cap_init_sockets(); |
1da177e4 LT |
5705 | if (err < 0) |
5706 | return err; | |
5707 | ||
aef7d97c | 5708 | if (bt_debugfs) { |
2d792818 GP |
5709 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
5710 | NULL, &l2cap_debugfs_fops); | |
aef7d97c MH |
5711 | if (!l2cap_debugfs) |
5712 | BT_ERR("Failed to create L2CAP debug file"); | |
5713 | } | |
1da177e4 | 5714 | |
1da177e4 | 5715 | return 0; |
1da177e4 LT |
5716 | } |
5717 | ||
64274518 | 5718 | void l2cap_exit(void) |
1da177e4 | 5719 | { |
aef7d97c | 5720 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5721 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5722 | } |
5723 | ||
d1c4a17d GP |
5724 | module_param(disable_ertm, bool, 0644); |
5725 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |