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) { |
56f60984 | 534 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 535 | /* Delete from channel list */ |
3df91ea2 | 536 | list_del(&chan->list); |
3d57dc68 | 537 | |
371fd835 | 538 | l2cap_chan_put(chan); |
baa7e1fa | 539 | |
8c1d787b | 540 | chan->conn = NULL; |
3cabbfda AE |
541 | |
542 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
543 | hci_conn_put(conn->hcon); | |
56f60984 AE |
544 | |
545 | if (mgr && mgr->bredr_chan == chan) | |
546 | mgr->bredr_chan = NULL; | |
0139418c MH |
547 | } |
548 | ||
b699ec0d | 549 | chan->ops->teardown(chan, err); |
6be36555 | 550 | |
2827011f | 551 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 552 | return; |
2ead70b8 | 553 | |
ee556f66 GP |
554 | switch(chan->mode) { |
555 | case L2CAP_MODE_BASIC: | |
556 | break; | |
c13ffa62 | 557 | |
ee556f66 | 558 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
559 | __clear_retrans_timer(chan); |
560 | __clear_monitor_timer(chan); | |
561 | __clear_ack_timer(chan); | |
c13ffa62 | 562 | |
f1c6775b | 563 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 564 | |
3c588192 MM |
565 | l2cap_seq_list_free(&chan->srej_list); |
566 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
567 | |
568 | /* fall through */ | |
569 | ||
570 | case L2CAP_MODE_STREAMING: | |
571 | skb_queue_purge(&chan->tx_q); | |
572 | break; | |
c13ffa62 | 573 | } |
ee556f66 GP |
574 | |
575 | return; | |
0139418c MH |
576 | } |
577 | ||
0f852724 | 578 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
579 | { |
580 | struct l2cap_conn *conn = chan->conn; | |
581 | struct sock *sk = chan->sk; | |
582 | ||
2d792818 GP |
583 | BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
584 | sk); | |
4519de9a | 585 | |
89bc500e | 586 | switch (chan->state) { |
4519de9a | 587 | case BT_LISTEN: |
b699ec0d | 588 | chan->ops->teardown(chan, 0); |
4519de9a GP |
589 | break; |
590 | ||
591 | case BT_CONNECTED: | |
592 | case BT_CONFIG: | |
715ec005 | 593 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 594 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 595 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
596 | l2cap_send_disconn_req(conn, chan, reason); |
597 | } else | |
598 | l2cap_chan_del(chan, reason); | |
599 | break; | |
600 | ||
601 | case BT_CONNECT2: | |
715ec005 | 602 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 603 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
604 | struct l2cap_conn_rsp rsp; |
605 | __u16 result; | |
606 | ||
c5daa683 | 607 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
608 | result = L2CAP_CR_SEC_BLOCK; |
609 | else | |
610 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 611 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
612 | |
613 | rsp.scid = cpu_to_le16(chan->dcid); | |
614 | rsp.dcid = cpu_to_le16(chan->scid); | |
615 | rsp.result = cpu_to_le16(result); | |
ac73498c | 616 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 617 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 618 | sizeof(rsp), &rsp); |
4519de9a GP |
619 | } |
620 | ||
621 | l2cap_chan_del(chan, reason); | |
622 | break; | |
623 | ||
624 | case BT_CONNECT: | |
625 | case BT_DISCONN: | |
626 | l2cap_chan_del(chan, reason); | |
627 | break; | |
628 | ||
629 | default: | |
b699ec0d | 630 | chan->ops->teardown(chan, 0); |
4519de9a GP |
631 | break; |
632 | } | |
633 | } | |
634 | ||
4343478f | 635 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 636 | { |
715ec005 | 637 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 638 | switch (chan->sec_level) { |
8556edd3 JH |
639 | case BT_SECURITY_HIGH: |
640 | return HCI_AT_DEDICATED_BONDING_MITM; | |
641 | case BT_SECURITY_MEDIUM: | |
642 | return HCI_AT_DEDICATED_BONDING; | |
643 | default: | |
644 | return HCI_AT_NO_BONDING; | |
645 | } | |
2983fd68 | 646 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
647 | if (chan->sec_level == BT_SECURITY_LOW) |
648 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 649 | |
4343478f | 650 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 651 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 652 | else |
8556edd3 | 653 | return HCI_AT_NO_BONDING; |
00ae4af9 | 654 | } else { |
4343478f | 655 | switch (chan->sec_level) { |
00ae4af9 | 656 | case BT_SECURITY_HIGH: |
8556edd3 | 657 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 658 | case BT_SECURITY_MEDIUM: |
8556edd3 | 659 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 660 | default: |
8556edd3 | 661 | return HCI_AT_NO_BONDING; |
00ae4af9 | 662 | } |
0684e5f9 | 663 | } |
8556edd3 JH |
664 | } |
665 | ||
666 | /* Service level security */ | |
d45fc423 | 667 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 668 | { |
8c1d787b | 669 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
670 | __u8 auth_type; |
671 | ||
4343478f | 672 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 673 | |
4343478f | 674 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
675 | } |
676 | ||
b5ad8b7f | 677 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
678 | { |
679 | u8 id; | |
680 | ||
681 | /* Get next available identificator. | |
682 | * 1 - 128 are used by kernel. | |
683 | * 129 - 199 are reserved. | |
684 | * 200 - 254 are used by utilities like l2ping, etc. | |
685 | */ | |
686 | ||
333055f2 | 687 | spin_lock(&conn->lock); |
4e8402a3 MH |
688 | |
689 | if (++conn->tx_ident > 128) | |
690 | conn->tx_ident = 1; | |
691 | ||
692 | id = conn->tx_ident; | |
693 | ||
333055f2 | 694 | spin_unlock(&conn->lock); |
4e8402a3 MH |
695 | |
696 | return id; | |
697 | } | |
698 | ||
2d792818 GP |
699 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
700 | void *data) | |
4e8402a3 MH |
701 | { |
702 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 703 | u8 flags; |
4e8402a3 MH |
704 | |
705 | BT_DBG("code 0x%2.2x", code); | |
706 | ||
707 | if (!skb) | |
9a9c6a34 | 708 | return; |
4e8402a3 | 709 | |
e702112f AE |
710 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
711 | flags = ACL_START_NO_FLUSH; | |
712 | else | |
713 | flags = ACL_START; | |
714 | ||
14b12d0b | 715 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 716 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 717 | |
73d80deb LAD |
718 | hci_send_acl(conn->hchan, skb, flags); |
719 | } | |
720 | ||
721 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
722 | { | |
723 | struct hci_conn *hcon = chan->conn->hcon; | |
724 | u16 flags; | |
725 | ||
726 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 727 | skb->priority); |
73d80deb LAD |
728 | |
729 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
2d792818 | 730 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
731 | flags = ACL_START_NO_FLUSH; |
732 | else | |
733 | flags = ACL_START; | |
14b12d0b | 734 | |
73d80deb LAD |
735 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
736 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
737 | } |
738 | ||
b76bbd66 MM |
739 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
740 | { | |
741 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
742 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
743 | ||
744 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
745 | /* S-Frame */ | |
746 | control->sframe = 1; | |
747 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
748 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
749 | ||
750 | control->sar = 0; | |
751 | control->txseq = 0; | |
752 | } else { | |
753 | /* I-Frame */ | |
754 | control->sframe = 0; | |
755 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
756 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
757 | ||
758 | control->poll = 0; | |
759 | control->super = 0; | |
760 | } | |
761 | } | |
762 | ||
b76bbd66 MM |
763 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
764 | { | |
765 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
766 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
767 | ||
768 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
769 | /* S-Frame */ | |
770 | control->sframe = 1; | |
771 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
772 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
773 | ||
774 | control->sar = 0; | |
775 | control->txseq = 0; | |
776 | } else { | |
777 | /* I-Frame */ | |
778 | control->sframe = 0; | |
779 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
780 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
781 | ||
782 | control->poll = 0; | |
783 | control->super = 0; | |
784 | } | |
785 | } | |
786 | ||
787 | static inline void __unpack_control(struct l2cap_chan *chan, | |
788 | struct sk_buff *skb) | |
789 | { | |
790 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
791 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
792 | &bt_cb(skb)->control); | |
cec8ab6e | 793 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
794 | } else { |
795 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
796 | &bt_cb(skb)->control); | |
cec8ab6e | 797 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
798 | } |
799 | } | |
800 | ||
b5c6aaed MM |
801 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
802 | { | |
803 | u32 packed; | |
804 | ||
805 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
806 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
807 | ||
808 | if (control->sframe) { | |
809 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
810 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
811 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
812 | } else { | |
813 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
814 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
815 | } | |
816 | ||
817 | return packed; | |
818 | } | |
819 | ||
820 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
821 | { | |
822 | u16 packed; | |
823 | ||
824 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
825 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
826 | ||
827 | if (control->sframe) { | |
828 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
829 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
830 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
831 | } else { | |
832 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
833 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
834 | } | |
835 | ||
836 | return packed; | |
837 | } | |
838 | ||
b76bbd66 MM |
839 | static inline void __pack_control(struct l2cap_chan *chan, |
840 | struct l2cap_ctrl *control, | |
841 | struct sk_buff *skb) | |
842 | { | |
843 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
844 | put_unaligned_le32(__pack_extended_control(control), | |
845 | skb->data + L2CAP_HDR_SIZE); | |
846 | } else { | |
847 | put_unaligned_le16(__pack_enhanced_control(control), | |
848 | skb->data + L2CAP_HDR_SIZE); | |
849 | } | |
850 | } | |
851 | ||
ba7aa64f GP |
852 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
853 | { | |
854 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
855 | return L2CAP_EXT_HDR_SIZE; | |
856 | else | |
857 | return L2CAP_ENH_HDR_SIZE; | |
858 | } | |
859 | ||
a67d7f6f MM |
860 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
861 | u32 control) | |
b5c6aaed MM |
862 | { |
863 | struct sk_buff *skb; | |
864 | struct l2cap_hdr *lh; | |
ba7aa64f | 865 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
866 | |
867 | if (chan->fcs == L2CAP_FCS_CRC16) | |
868 | hlen += L2CAP_FCS_SIZE; | |
869 | ||
a67d7f6f | 870 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 871 | |
b5c6aaed | 872 | if (!skb) |
a67d7f6f | 873 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
874 | |
875 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
876 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
877 | lh->cid = cpu_to_le16(chan->dcid); | |
878 | ||
a67d7f6f MM |
879 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
880 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
881 | else | |
882 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
883 | |
884 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 885 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
886 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
887 | } | |
888 | ||
889 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
890 | return skb; |
891 | } | |
892 | ||
893 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
894 | struct l2cap_ctrl *control) | |
895 | { | |
896 | struct sk_buff *skb; | |
897 | u32 control_field; | |
898 | ||
899 | BT_DBG("chan %p, control %p", chan, control); | |
900 | ||
901 | if (!control->sframe) | |
902 | return; | |
903 | ||
904 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
905 | !control->poll) | |
906 | control->final = 1; | |
907 | ||
908 | if (control->super == L2CAP_SUPER_RR) | |
909 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
910 | else if (control->super == L2CAP_SUPER_RNR) | |
911 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
912 | ||
913 | if (control->super != L2CAP_SUPER_SREJ) { | |
914 | chan->last_acked_seq = control->reqseq; | |
915 | __clear_ack_timer(chan); | |
916 | } | |
917 | ||
918 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
919 | control->final, control->poll, control->super); | |
920 | ||
921 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
922 | control_field = __pack_extended_control(control); | |
923 | else | |
924 | control_field = __pack_enhanced_control(control); | |
925 | ||
926 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
927 | if (!IS_ERR(skb)) | |
928 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
929 | } |
930 | ||
c9e3d5e0 | 931 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 932 | { |
c9e3d5e0 MM |
933 | struct l2cap_ctrl control; |
934 | ||
935 | BT_DBG("chan %p, poll %d", chan, poll); | |
936 | ||
937 | memset(&control, 0, sizeof(control)); | |
938 | control.sframe = 1; | |
939 | control.poll = poll; | |
940 | ||
941 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
942 | control.super = L2CAP_SUPER_RNR; | |
943 | else | |
944 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 945 | |
c9e3d5e0 MM |
946 | control.reqseq = chan->buffer_seq; |
947 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
948 | } |
949 | ||
b4450035 | 950 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 951 | { |
c1360a1c | 952 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
953 | } |
954 | ||
93c3e8f5 AE |
955 | static bool __amp_capable(struct l2cap_chan *chan) |
956 | { | |
957 | struct l2cap_conn *conn = chan->conn; | |
958 | ||
959 | if (enable_hs && | |
960 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && | |
961 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
962 | return true; | |
963 | else | |
964 | return false; | |
965 | } | |
966 | ||
2766be48 | 967 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
968 | { |
969 | struct l2cap_conn *conn = chan->conn; | |
970 | struct l2cap_conn_req req; | |
971 | ||
972 | req.scid = cpu_to_le16(chan->scid); | |
973 | req.psm = chan->psm; | |
974 | ||
975 | chan->ident = l2cap_get_ident(conn); | |
976 | ||
977 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
978 | ||
979 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
980 | } | |
981 | ||
9f0caeb1 VCG |
982 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
983 | { | |
2827011f | 984 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
985 | chan->conf_state = 0; |
986 | __clear_chan_timer(chan); | |
987 | ||
54a59aa2 | 988 | chan->state = BT_CONNECTED; |
9f0caeb1 | 989 | |
fd83e2c2 | 990 | chan->ops->ready(chan); |
9f0caeb1 VCG |
991 | } |
992 | ||
93c3e8f5 AE |
993 | static void l2cap_start_connection(struct l2cap_chan *chan) |
994 | { | |
995 | if (__amp_capable(chan)) { | |
996 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
997 | a2mp_discover_amp(chan); | |
998 | } else { | |
999 | l2cap_send_conn_req(chan); | |
1000 | } | |
1001 | } | |
1002 | ||
fc7f8a7e | 1003 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1004 | { |
8c1d787b | 1005 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1006 | |
9f0caeb1 VCG |
1007 | if (conn->hcon->type == LE_LINK) { |
1008 | l2cap_chan_ready(chan); | |
1009 | return; | |
1010 | } | |
1011 | ||
79d554a6 | 1012 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1013 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1014 | return; | |
1015 | ||
d45fc423 | 1016 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1017 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1018 | l2cap_start_connection(chan); |
1019 | } | |
79d554a6 MH |
1020 | } else { |
1021 | struct l2cap_info_req req; | |
ac73498c | 1022 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1023 | |
1024 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1025 | conn->info_ident = l2cap_get_ident(conn); | |
1026 | ||
ba13ccd9 | 1027 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1028 | |
2d792818 GP |
1029 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1030 | sizeof(req), &req); | |
79d554a6 MH |
1031 | } |
1032 | } | |
1033 | ||
cf6c2c0b GP |
1034 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1035 | { | |
1036 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1037 | if (!disable_ertm) |
cf6c2c0b GP |
1038 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1039 | ||
1040 | switch (mode) { | |
1041 | case L2CAP_MODE_ERTM: | |
1042 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1043 | case L2CAP_MODE_STREAMING: | |
1044 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1045 | default: | |
1046 | return 0x00; | |
1047 | } | |
1048 | } | |
1049 | ||
2d792818 GP |
1050 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
1051 | struct l2cap_chan *chan, int err) | |
22121fc9 | 1052 | { |
6be36555 | 1053 | struct sock *sk = chan->sk; |
22121fc9 GP |
1054 | struct l2cap_disconn_req req; |
1055 | ||
c13ffa62 GP |
1056 | if (!conn) |
1057 | return; | |
1058 | ||
aad3d0e3 | 1059 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1060 | __clear_retrans_timer(chan); |
1061 | __clear_monitor_timer(chan); | |
1062 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1063 | } |
1064 | ||
416fa752 | 1065 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1066 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1067 | return; |
1068 | } | |
1069 | ||
fe4128e0 GP |
1070 | req.dcid = cpu_to_le16(chan->dcid); |
1071 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1072 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1073 | sizeof(req), &req); | |
c13ffa62 | 1074 | |
6be36555 | 1075 | lock_sock(sk); |
0e587be7 | 1076 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1077 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1078 | release_sock(sk); |
22121fc9 GP |
1079 | } |
1080 | ||
1da177e4 | 1081 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1082 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1083 | { | |
3df91ea2 | 1084 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1085 | |
1086 | BT_DBG("conn %p", conn); | |
1087 | ||
3df91ea2 | 1088 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1089 | |
3df91ea2 | 1090 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1091 | struct sock *sk = chan->sk; |
baa7e1fa | 1092 | |
6be36555 | 1093 | l2cap_chan_lock(chan); |
4e8402a3 | 1094 | |
715ec005 | 1095 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1096 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1097 | continue; |
1098 | } | |
1099 | ||
89bc500e | 1100 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1101 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1102 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1103 | l2cap_chan_unlock(chan); |
47731de7 GP |
1104 | continue; |
1105 | } | |
79d554a6 | 1106 | |
c1360a1c | 1107 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1108 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1109 | &chan->conf_state)) { |
89bc500e | 1110 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1111 | l2cap_chan_unlock(chan); |
47731de7 | 1112 | continue; |
b1235d79 | 1113 | } |
47731de7 | 1114 | |
93c3e8f5 | 1115 | l2cap_start_connection(chan); |
47731de7 | 1116 | |
89bc500e | 1117 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1118 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1119 | char buf[128]; |
fe4128e0 GP |
1120 | rsp.scid = cpu_to_le16(chan->dcid); |
1121 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1122 | |
d45fc423 | 1123 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1124 | lock_sock(sk); |
c5daa683 GP |
1125 | if (test_bit(BT_SK_DEFER_SETUP, |
1126 | &bt_sk(sk)->flags)) { | |
ac73498c AE |
1127 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1128 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1129 | chan->ops->defer(chan); |
f66dc81f MH |
1130 | |
1131 | } else { | |
0e587be7 | 1132 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1133 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1134 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1135 | } |
6be36555 | 1136 | release_sock(sk); |
79d554a6 | 1137 | } else { |
ac73498c AE |
1138 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1139 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1140 | } |
1141 | ||
fc7f8a7e | 1142 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1143 | sizeof(rsp), &rsp); |
e9aeb2dd | 1144 | |
c1360a1c | 1145 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1146 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1147 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1148 | continue; |
1149 | } | |
1150 | ||
c1360a1c | 1151 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1152 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1153 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1154 | chan->num_conf_req++; |
4e8402a3 MH |
1155 | } |
1156 | ||
6be36555 | 1157 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1158 | } |
1159 | ||
3df91ea2 | 1160 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1161 | } |
1162 | ||
c2287681 | 1163 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1164 | * Returns closest match, locked. |
1165 | */ | |
d9b88702 | 1166 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1167 | bdaddr_t *src, |
1168 | bdaddr_t *dst) | |
b62f328b | 1169 | { |
23691d75 | 1170 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1171 | |
23691d75 | 1172 | read_lock(&chan_list_lock); |
b62f328b | 1173 | |
23691d75 GP |
1174 | list_for_each_entry(c, &chan_list, global_l) { |
1175 | struct sock *sk = c->sk; | |
fe4128e0 | 1176 | |
89bc500e | 1177 | if (state && c->state != state) |
b62f328b VT |
1178 | continue; |
1179 | ||
23691d75 | 1180 | if (c->scid == cid) { |
c2287681 IY |
1181 | int src_match, dst_match; |
1182 | int src_any, dst_any; | |
1183 | ||
b62f328b | 1184 | /* Exact match. */ |
c2287681 IY |
1185 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1186 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1187 | if (src_match && dst_match) { | |
23691d75 GP |
1188 | read_unlock(&chan_list_lock); |
1189 | return c; | |
1190 | } | |
b62f328b VT |
1191 | |
1192 | /* Closest match */ | |
c2287681 IY |
1193 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1194 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1195 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1196 | (src_any && dst_any)) | |
23691d75 | 1197 | c1 = c; |
b62f328b VT |
1198 | } |
1199 | } | |
280f294f | 1200 | |
23691d75 | 1201 | read_unlock(&chan_list_lock); |
b62f328b | 1202 | |
23691d75 | 1203 | return c1; |
b62f328b VT |
1204 | } |
1205 | ||
1206 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1207 | { | |
c916fbe4 | 1208 | struct sock *parent, *sk; |
23691d75 | 1209 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1210 | |
1211 | BT_DBG(""); | |
1212 | ||
1213 | /* Check if we have socket listening on cid */ | |
23691d75 | 1214 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1215 | conn->src, conn->dst); |
23691d75 | 1216 | if (!pchan) |
b62f328b VT |
1217 | return; |
1218 | ||
23691d75 GP |
1219 | parent = pchan->sk; |
1220 | ||
aa2ac881 | 1221 | lock_sock(parent); |
62f3a2cf | 1222 | |
80b98027 | 1223 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1224 | if (!chan) |
b62f328b VT |
1225 | goto clean; |
1226 | ||
80808e43 | 1227 | sk = chan->sk; |
5d41ce1d | 1228 | |
b62f328b | 1229 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1230 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1231 | |
b62f328b VT |
1232 | bacpy(&bt_sk(sk)->src, conn->src); |
1233 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1234 | ||
3d57dc68 | 1235 | l2cap_chan_add(conn, chan); |
48454079 | 1236 | |
6754e0df | 1237 | l2cap_chan_ready(chan); |
b62f328b | 1238 | |
b62f328b | 1239 | clean: |
aa2ac881 | 1240 | release_sock(parent); |
b62f328b VT |
1241 | } |
1242 | ||
4e8402a3 MH |
1243 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1244 | { | |
48454079 | 1245 | struct l2cap_chan *chan; |
cc110922 | 1246 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1247 | |
79d554a6 | 1248 | BT_DBG("conn %p", conn); |
4e8402a3 | 1249 | |
cc110922 | 1250 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1251 | l2cap_le_conn_ready(conn); |
1252 | ||
cc110922 VCG |
1253 | if (hcon->out && hcon->type == LE_LINK) |
1254 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1255 | |
3df91ea2 | 1256 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1257 | |
3df91ea2 | 1258 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1259 | |
6be36555 | 1260 | l2cap_chan_lock(chan); |
4e8402a3 | 1261 | |
416fa752 AE |
1262 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1263 | l2cap_chan_unlock(chan); | |
1264 | continue; | |
1265 | } | |
1266 | ||
cc110922 VCG |
1267 | if (hcon->type == LE_LINK) { |
1268 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1269 | l2cap_chan_ready(chan); |
acd7d370 | 1270 | |
63128451 | 1271 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1272 | struct sock *sk = chan->sk; |
c9b66675 | 1273 | __clear_chan_timer(chan); |
6be36555 | 1274 | lock_sock(sk); |
0e587be7 | 1275 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1276 | sk->sk_state_change(sk); |
6be36555 | 1277 | release_sock(sk); |
b501d6a1 | 1278 | |
89bc500e | 1279 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1280 | l2cap_do_start(chan); |
4e8402a3 | 1281 | |
6be36555 | 1282 | l2cap_chan_unlock(chan); |
4e8402a3 | 1283 | } |
79d554a6 | 1284 | |
3df91ea2 | 1285 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1286 | } |
1287 | ||
1288 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1289 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1290 | { | |
48454079 | 1291 | struct l2cap_chan *chan; |
4e8402a3 MH |
1292 | |
1293 | BT_DBG("conn %p", conn); | |
1294 | ||
3df91ea2 | 1295 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1296 | |
3df91ea2 | 1297 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1298 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1299 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1300 | } |
1301 | ||
3df91ea2 | 1302 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1303 | } |
1304 | ||
f878fcad | 1305 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1306 | { |
f878fcad | 1307 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1308 | info_timer.work); |
4e8402a3 | 1309 | |
984947dc | 1310 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1311 | conn->info_ident = 0; |
984947dc | 1312 | |
4e8402a3 MH |
1313 | l2cap_conn_start(conn); |
1314 | } | |
1315 | ||
5d3de7df VCG |
1316 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1317 | { | |
1318 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1319 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1320 | |
1321 | if (!conn) | |
1322 | return; | |
1323 | ||
1324 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1325 | ||
1326 | kfree_skb(conn->rx_skb); | |
1327 | ||
3df91ea2 AE |
1328 | mutex_lock(&conn->chan_lock); |
1329 | ||
5d3de7df VCG |
1330 | /* Kill channels */ |
1331 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1332 | l2cap_chan_hold(chan); |
6be36555 AE |
1333 | l2cap_chan_lock(chan); |
1334 | ||
5d3de7df | 1335 | l2cap_chan_del(chan, err); |
6be36555 AE |
1336 | |
1337 | l2cap_chan_unlock(chan); | |
1338 | ||
80b98027 | 1339 | chan->ops->close(chan); |
61d6ef3e | 1340 | l2cap_chan_put(chan); |
5d3de7df VCG |
1341 | } |
1342 | ||
3df91ea2 AE |
1343 | mutex_unlock(&conn->chan_lock); |
1344 | ||
73d80deb LAD |
1345 | hci_chan_del(conn->hchan); |
1346 | ||
5d3de7df | 1347 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1348 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1349 | |
51a8efd7 | 1350 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1351 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1352 | smp_chan_destroy(conn); |
d26a2345 | 1353 | } |
5d3de7df VCG |
1354 | |
1355 | hcon->l2cap_data = NULL; | |
1356 | kfree(conn); | |
1357 | } | |
1358 | ||
6c9d42a1 | 1359 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1360 | { |
6c9d42a1 | 1361 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1362 | security_timer.work); |
5d3de7df | 1363 | |
d06cc416 JH |
1364 | BT_DBG("conn %p", conn); |
1365 | ||
1366 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1367 | smp_chan_destroy(conn); | |
1368 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1369 | } | |
5d3de7df VCG |
1370 | } |
1371 | ||
1da177e4 LT |
1372 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1373 | { | |
0139418c | 1374 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1375 | struct hci_chan *hchan; |
1da177e4 | 1376 | |
0139418c | 1377 | if (conn || status) |
1da177e4 LT |
1378 | return conn; |
1379 | ||
73d80deb LAD |
1380 | hchan = hci_chan_create(hcon); |
1381 | if (!hchan) | |
1382 | return NULL; | |
1383 | ||
8bcde1f2 | 1384 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1385 | if (!conn) { |
1386 | hci_chan_del(hchan); | |
1da177e4 | 1387 | return NULL; |
73d80deb | 1388 | } |
1da177e4 LT |
1389 | |
1390 | hcon->l2cap_data = conn; | |
1391 | conn->hcon = hcon; | |
73d80deb | 1392 | conn->hchan = hchan; |
1da177e4 | 1393 | |
73d80deb | 1394 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1395 | |
dcc042d5 AE |
1396 | switch (hcon->type) { |
1397 | case AMP_LINK: | |
1398 | conn->mtu = hcon->hdev->block_mtu; | |
1399 | break; | |
1400 | ||
1401 | case LE_LINK: | |
1402 | if (hcon->hdev->le_mtu) { | |
1403 | conn->mtu = hcon->hdev->le_mtu; | |
1404 | break; | |
1405 | } | |
1406 | /* fall through */ | |
1407 | ||
1408 | default: | |
acd7d370 | 1409 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1410 | break; |
1411 | } | |
acd7d370 | 1412 | |
1da177e4 LT |
1413 | conn->src = &hcon->hdev->bdaddr; |
1414 | conn->dst = &hcon->dst; | |
1415 | ||
4e8402a3 MH |
1416 | conn->feat_mask = 0; |
1417 | ||
1da177e4 | 1418 | spin_lock_init(&conn->lock); |
3df91ea2 | 1419 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1420 | |
1421 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1422 | |
5d3de7df | 1423 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1424 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1425 | else |
030013d8 | 1426 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1427 | |
9f5a0d7b | 1428 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1429 | |
1da177e4 LT |
1430 | return conn; |
1431 | } | |
1432 | ||
1da177e4 | 1433 | /* ---- Socket interface ---- */ |
1da177e4 | 1434 | |
c2287681 | 1435 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1436 | * Returns closest match. |
1437 | */ | |
c2287681 IY |
1438 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1439 | bdaddr_t *src, | |
1440 | bdaddr_t *dst) | |
1da177e4 | 1441 | { |
23691d75 | 1442 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1443 | |
23691d75 | 1444 | read_lock(&chan_list_lock); |
e0f0cb56 | 1445 | |
23691d75 GP |
1446 | list_for_each_entry(c, &chan_list, global_l) { |
1447 | struct sock *sk = c->sk; | |
fe4128e0 | 1448 | |
89bc500e | 1449 | if (state && c->state != state) |
1da177e4 LT |
1450 | continue; |
1451 | ||
23691d75 | 1452 | if (c->psm == psm) { |
c2287681 IY |
1453 | int src_match, dst_match; |
1454 | int src_any, dst_any; | |
1455 | ||
1da177e4 | 1456 | /* Exact match. */ |
c2287681 IY |
1457 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1458 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1459 | if (src_match && dst_match) { | |
a7567b20 | 1460 | read_unlock(&chan_list_lock); |
23691d75 GP |
1461 | return c; |
1462 | } | |
1da177e4 LT |
1463 | |
1464 | /* Closest match */ | |
c2287681 IY |
1465 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1466 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1467 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1468 | (src_any && dst_any)) | |
23691d75 | 1469 | c1 = c; |
1da177e4 LT |
1470 | } |
1471 | } | |
1da177e4 | 1472 | |
23691d75 | 1473 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1474 | |
23691d75 | 1475 | return c1; |
1da177e4 LT |
1476 | } |
1477 | ||
8e9f9892 AG |
1478 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1479 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1480 | { |
5d41ce1d | 1481 | struct sock *sk = chan->sk; |
1da177e4 | 1482 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1483 | struct l2cap_conn *conn; |
1484 | struct hci_conn *hcon; | |
1485 | struct hci_dev *hdev; | |
09ab6f4c | 1486 | __u8 auth_type; |
44d0e48e | 1487 | int err; |
1da177e4 | 1488 | |
6ed93dc6 | 1489 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1490 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1491 | |
af05b30b GP |
1492 | hdev = hci_get_route(dst, src); |
1493 | if (!hdev) | |
1da177e4 LT |
1494 | return -EHOSTUNREACH; |
1495 | ||
09fd0de5 | 1496 | hci_dev_lock(hdev); |
1da177e4 | 1497 | |
6be36555 | 1498 | l2cap_chan_lock(chan); |
03a00194 GP |
1499 | |
1500 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1501 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1502 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1503 | err = -EINVAL; |
1504 | goto done; | |
1505 | } | |
1506 | ||
1507 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1508 | err = -EINVAL; | |
1509 | goto done; | |
1510 | } | |
1511 | ||
1512 | switch (chan->mode) { | |
1513 | case L2CAP_MODE_BASIC: | |
1514 | break; | |
1515 | case L2CAP_MODE_ERTM: | |
1516 | case L2CAP_MODE_STREAMING: | |
1517 | if (!disable_ertm) | |
1518 | break; | |
1519 | /* fall through */ | |
1520 | default: | |
1521 | err = -ENOTSUPP; | |
1522 | goto done; | |
1523 | } | |
1524 | ||
0797e01d | 1525 | switch (chan->state) { |
03a00194 GP |
1526 | case BT_CONNECT: |
1527 | case BT_CONNECT2: | |
1528 | case BT_CONFIG: | |
1529 | /* Already connecting */ | |
1530 | err = 0; | |
1531 | goto done; | |
1532 | ||
1533 | case BT_CONNECTED: | |
1534 | /* Already connected */ | |
1535 | err = -EISCONN; | |
1536 | goto done; | |
1537 | ||
1538 | case BT_OPEN: | |
1539 | case BT_BOUND: | |
1540 | /* Can connect */ | |
1541 | break; | |
1542 | ||
1543 | default: | |
1544 | err = -EBADFD; | |
1545 | goto done; | |
1546 | } | |
1547 | ||
1548 | /* Set destination address and psm */ | |
0797e01d | 1549 | lock_sock(sk); |
9219b2a0 | 1550 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1551 | release_sock(sk); |
1552 | ||
03a00194 GP |
1553 | chan->psm = psm; |
1554 | chan->dcid = cid; | |
1da177e4 | 1555 | |
4343478f | 1556 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1557 | |
fe4128e0 | 1558 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1559 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1560 | chan->sec_level, auth_type); |
acd7d370 | 1561 | else |
8e9f9892 | 1562 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1563 | chan->sec_level, auth_type); |
acd7d370 | 1564 | |
30e76272 VT |
1565 | if (IS_ERR(hcon)) { |
1566 | err = PTR_ERR(hcon); | |
1da177e4 | 1567 | goto done; |
30e76272 | 1568 | } |
1da177e4 LT |
1569 | |
1570 | conn = l2cap_conn_add(hcon, 0); | |
1571 | if (!conn) { | |
1572 | hci_conn_put(hcon); | |
30e76272 | 1573 | err = -ENOMEM; |
1da177e4 LT |
1574 | goto done; |
1575 | } | |
1576 | ||
9f0caeb1 VCG |
1577 | if (hcon->type == LE_LINK) { |
1578 | err = 0; | |
1579 | ||
1580 | if (!list_empty(&conn->chan_l)) { | |
1581 | err = -EBUSY; | |
1582 | hci_conn_put(hcon); | |
1583 | } | |
1584 | ||
1585 | if (err) | |
1586 | goto done; | |
1587 | } | |
1588 | ||
1da177e4 LT |
1589 | /* Update source addr of the socket */ |
1590 | bacpy(src, conn->src); | |
1591 | ||
6be36555 | 1592 | l2cap_chan_unlock(chan); |
48454079 | 1593 | l2cap_chan_add(conn, chan); |
6be36555 | 1594 | l2cap_chan_lock(chan); |
48454079 | 1595 | |
6be36555 | 1596 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1597 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1598 | |
1599 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1600 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1601 | __clear_chan_timer(chan); |
d45fc423 | 1602 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1603 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1604 | } else |
fc7f8a7e | 1605 | l2cap_do_start(chan); |
1da177e4 LT |
1606 | } |
1607 | ||
30e76272 VT |
1608 | err = 0; |
1609 | ||
1da177e4 | 1610 | done: |
6be36555 | 1611 | l2cap_chan_unlock(chan); |
09fd0de5 | 1612 | hci_dev_unlock(hdev); |
1da177e4 LT |
1613 | hci_dev_put(hdev); |
1614 | return err; | |
1615 | } | |
1616 | ||
dcba0dba | 1617 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1618 | { |
8c1d787b | 1619 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1620 | DECLARE_WAITQUEUE(wait, current); |
1621 | int err = 0; | |
1622 | int timeo = HZ/5; | |
1623 | ||
2b0b05dd | 1624 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1625 | set_current_state(TASK_INTERRUPTIBLE); |
1626 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1627 | if (!timeo) |
1628 | timeo = HZ/5; | |
1629 | ||
1630 | if (signal_pending(current)) { | |
1631 | err = sock_intr_errno(timeo); | |
1632 | break; | |
1633 | } | |
1634 | ||
1635 | release_sock(sk); | |
1636 | timeo = schedule_timeout(timeo); | |
1637 | lock_sock(sk); | |
a71a0cf4 | 1638 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1639 | |
1640 | err = sock_error(sk); | |
1641 | if (err) | |
1642 | break; | |
1643 | } | |
1644 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1645 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1646 | return err; |
1647 | } | |
1648 | ||
721c4181 | 1649 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1650 | { |
721c4181 | 1651 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1652 | monitor_timer.work); |
e90bac06 | 1653 | |
525cd185 | 1654 | BT_DBG("chan %p", chan); |
0e98958d | 1655 | |
6be36555 AE |
1656 | l2cap_chan_lock(chan); |
1657 | ||
80909e04 | 1658 | if (!chan->conn) { |
6be36555 | 1659 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1660 | l2cap_chan_put(chan); |
e90bac06 GP |
1661 | return; |
1662 | } | |
1663 | ||
401bb1f7 | 1664 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1665 | |
6be36555 | 1666 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1667 | l2cap_chan_put(chan); |
e90bac06 GP |
1668 | } |
1669 | ||
721c4181 | 1670 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1671 | { |
721c4181 | 1672 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1673 | retrans_timer.work); |
e90bac06 | 1674 | |
49208c9c | 1675 | BT_DBG("chan %p", chan); |
0e98958d | 1676 | |
6be36555 AE |
1677 | l2cap_chan_lock(chan); |
1678 | ||
80909e04 MM |
1679 | if (!chan->conn) { |
1680 | l2cap_chan_unlock(chan); | |
1681 | l2cap_chan_put(chan); | |
1682 | return; | |
1683 | } | |
6be36555 | 1684 | |
401bb1f7 | 1685 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1686 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1687 | l2cap_chan_put(chan); |
e90bac06 GP |
1688 | } |
1689 | ||
d660366d GP |
1690 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1691 | struct sk_buff_head *skbs) | |
6840ed07 | 1692 | { |
ccbb84af | 1693 | struct sk_buff *skb; |
3733937d | 1694 | struct l2cap_ctrl *control; |
6840ed07 | 1695 | |
3733937d MM |
1696 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1697 | ||
3733937d MM |
1698 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1699 | ||
1700 | while (!skb_queue_empty(&chan->tx_q)) { | |
1701 | ||
1702 | skb = skb_dequeue(&chan->tx_q); | |
1703 | ||
1704 | bt_cb(skb)->control.retries = 1; | |
1705 | control = &bt_cb(skb)->control; | |
1706 | ||
1707 | control->reqseq = 0; | |
1708 | control->txseq = chan->next_tx_seq; | |
1709 | ||
1710 | __pack_control(chan, control, skb); | |
6840ed07 | 1711 | |
47d1ec61 | 1712 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1713 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1714 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1715 | } |
1716 | ||
4343478f | 1717 | l2cap_do_send(chan, skb); |
6840ed07 | 1718 | |
b4400672 | 1719 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1720 | |
836be934 | 1721 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1722 | chan->frames_sent++; |
6840ed07 | 1723 | } |
6840ed07 GP |
1724 | } |
1725 | ||
67c9e840 | 1726 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1727 | { |
1728 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1729 | struct l2cap_ctrl *control; |
1730 | int sent = 0; | |
1731 | ||
1732 | BT_DBG("chan %p", chan); | |
1c2acffb | 1733 | |
89bc500e | 1734 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1735 | return -ENOTCONN; |
e90bac06 | 1736 | |
94122bbe MM |
1737 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1738 | return 0; | |
1739 | ||
18a48e76 MM |
1740 | while (chan->tx_send_head && |
1741 | chan->unacked_frames < chan->remote_tx_win && | |
1742 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1743 | |
18a48e76 | 1744 | skb = chan->tx_send_head; |
e90bac06 | 1745 | |
18a48e76 MM |
1746 | bt_cb(skb)->control.retries = 1; |
1747 | control = &bt_cb(skb)->control; | |
95ffa978 | 1748 | |
e2ab4353 | 1749 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1750 | control->final = 1; |
e2ab4353 | 1751 | |
18a48e76 MM |
1752 | control->reqseq = chan->buffer_seq; |
1753 | chan->last_acked_seq = chan->buffer_seq; | |
1754 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1755 | |
18a48e76 | 1756 | __pack_control(chan, control, skb); |
e90bac06 | 1757 | |
47d1ec61 | 1758 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1759 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1760 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1761 | } |
1762 | ||
18a48e76 MM |
1763 | /* Clone after data has been modified. Data is assumed to be |
1764 | read-only (for locking purposes) on cloned sk_buffs. | |
1765 | */ | |
1766 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1767 | |
18a48e76 MM |
1768 | if (!tx_skb) |
1769 | break; | |
1c2acffb | 1770 | |
18a48e76 | 1771 | __set_retrans_timer(chan); |
836be934 AE |
1772 | |
1773 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1774 | chan->unacked_frames++; |
6a026610 | 1775 | chan->frames_sent++; |
18a48e76 | 1776 | sent++; |
1c2acffb | 1777 | |
58d35f87 GP |
1778 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1779 | chan->tx_send_head = NULL; | |
1c2acffb | 1780 | else |
58d35f87 | 1781 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1782 | |
1783 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1784 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1785 | } |
1786 | ||
b4400672 AE |
1787 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1788 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1789 | |
1790 | return sent; | |
9e917af1 GP |
1791 | } |
1792 | ||
e1fbd4c1 MM |
1793 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1794 | { | |
1795 | struct l2cap_ctrl control; | |
1796 | struct sk_buff *skb; | |
1797 | struct sk_buff *tx_skb; | |
1798 | u16 seq; | |
1799 | ||
1800 | BT_DBG("chan %p", chan); | |
1801 | ||
1802 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1803 | return; | |
1804 | ||
1805 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1806 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1807 | ||
1808 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1809 | if (!skb) { | |
1810 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1811 | seq); |
e1fbd4c1 MM |
1812 | continue; |
1813 | } | |
1814 | ||
1815 | bt_cb(skb)->control.retries++; | |
1816 | control = bt_cb(skb)->control; | |
1817 | ||
1818 | if (chan->max_tx != 0 && | |
1819 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1820 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1821 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1822 | l2cap_seq_list_clear(&chan->retrans_list); | |
1823 | break; | |
1824 | } | |
1825 | ||
1826 | control.reqseq = chan->buffer_seq; | |
1827 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1828 | control.final = 1; | |
1829 | else | |
1830 | control.final = 0; | |
1831 | ||
1832 | if (skb_cloned(skb)) { | |
1833 | /* Cloned sk_buffs are read-only, so we need a | |
1834 | * writeable copy | |
1835 | */ | |
8bcde1f2 | 1836 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1837 | } else { |
8bcde1f2 | 1838 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1839 | } |
1840 | ||
1841 | if (!tx_skb) { | |
1842 | l2cap_seq_list_clear(&chan->retrans_list); | |
1843 | break; | |
1844 | } | |
1845 | ||
1846 | /* Update skb contents */ | |
1847 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1848 | put_unaligned_le32(__pack_extended_control(&control), | |
1849 | tx_skb->data + L2CAP_HDR_SIZE); | |
1850 | } else { | |
1851 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1852 | tx_skb->data + L2CAP_HDR_SIZE); | |
1853 | } | |
1854 | ||
1855 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1856 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1857 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1858 | L2CAP_FCS_SIZE)); | |
1859 | } | |
1860 | ||
1861 | l2cap_do_send(chan, tx_skb); | |
1862 | ||
1863 | BT_DBG("Resent txseq %d", control.txseq); | |
1864 | ||
1865 | chan->last_acked_seq = chan->buffer_seq; | |
1866 | } | |
1867 | } | |
1868 | ||
f80842a8 MM |
1869 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1870 | struct l2cap_ctrl *control) | |
1871 | { | |
1872 | BT_DBG("chan %p, control %p", chan, control); | |
1873 | ||
1874 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1875 | l2cap_ertm_resend(chan); | |
1876 | } | |
1877 | ||
d2a7ac5d MM |
1878 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1879 | struct l2cap_ctrl *control) | |
1880 | { | |
e1fbd4c1 MM |
1881 | struct sk_buff *skb; |
1882 | ||
1883 | BT_DBG("chan %p, control %p", chan, control); | |
1884 | ||
1885 | if (control->poll) | |
1886 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1887 | ||
1888 | l2cap_seq_list_clear(&chan->retrans_list); | |
1889 | ||
1890 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1891 | return; | |
1892 | ||
1893 | if (chan->unacked_frames) { | |
1894 | skb_queue_walk(&chan->tx_q, skb) { | |
1895 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 1896 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
1897 | break; |
1898 | } | |
1899 | ||
1900 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1901 | if (skb == chan->tx_send_head) | |
1902 | break; | |
1903 | ||
1904 | l2cap_seq_list_append(&chan->retrans_list, | |
1905 | bt_cb(skb)->control.txseq); | |
1906 | } | |
1907 | ||
1908 | l2cap_ertm_resend(chan); | |
1909 | } | |
d2a7ac5d MM |
1910 | } |
1911 | ||
0a0aba42 | 1912 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1913 | { |
0a0aba42 MM |
1914 | struct l2cap_ctrl control; |
1915 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1916 | chan->last_acked_seq); | |
1917 | int threshold; | |
9e917af1 | 1918 | |
0a0aba42 MM |
1919 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1920 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1921 | |
0a0aba42 MM |
1922 | memset(&control, 0, sizeof(control)); |
1923 | control.sframe = 1; | |
dfc909be | 1924 | |
0a0aba42 MM |
1925 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1926 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1927 | __clear_ack_timer(chan); | |
1928 | control.super = L2CAP_SUPER_RNR; | |
1929 | control.reqseq = chan->buffer_seq; | |
1930 | l2cap_send_sframe(chan, &control); | |
1931 | } else { | |
1932 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1933 | l2cap_ertm_send(chan); | |
1934 | /* If any i-frames were sent, they included an ack */ | |
1935 | if (chan->buffer_seq == chan->last_acked_seq) | |
1936 | frames_to_ack = 0; | |
1937 | } | |
dfc909be | 1938 | |
c20f8e35 | 1939 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
1940 | * Calculate without mul or div |
1941 | */ | |
c20f8e35 | 1942 | threshold = chan->ack_win; |
0a0aba42 MM |
1943 | threshold += threshold << 1; |
1944 | threshold >>= 2; | |
1945 | ||
b4400672 | 1946 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1947 | threshold); |
1948 | ||
1949 | if (frames_to_ack >= threshold) { | |
1950 | __clear_ack_timer(chan); | |
1951 | control.super = L2CAP_SUPER_RR; | |
1952 | control.reqseq = chan->buffer_seq; | |
1953 | l2cap_send_sframe(chan, &control); | |
1954 | frames_to_ack = 0; | |
1955 | } | |
1c2acffb | 1956 | |
0a0aba42 MM |
1957 | if (frames_to_ack) |
1958 | __set_ack_timer(chan); | |
1959 | } | |
b17e73bb SJ |
1960 | } |
1961 | ||
04124681 GP |
1962 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1963 | struct msghdr *msg, int len, | |
1964 | int count, struct sk_buff *skb) | |
1c2acffb | 1965 | { |
0952a57a | 1966 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1967 | struct sk_buff **frag; |
90338947 | 1968 | int sent = 0; |
1da177e4 | 1969 | |
59203a21 | 1970 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1971 | return -EFAULT; |
1da177e4 LT |
1972 | |
1973 | sent += count; | |
1974 | len -= count; | |
1975 | ||
1976 | /* Continuation fragments (no L2CAP header) */ | |
1977 | frag = &skb_shinfo(skb)->frag_list; | |
1978 | while (len) { | |
fbe00700 GP |
1979 | struct sk_buff *tmp; |
1980 | ||
1da177e4 LT |
1981 | count = min_t(unsigned int, conn->mtu, len); |
1982 | ||
fbe00700 GP |
1983 | tmp = chan->ops->alloc_skb(chan, count, |
1984 | msg->msg_flags & MSG_DONTWAIT); | |
1985 | if (IS_ERR(tmp)) | |
1986 | return PTR_ERR(tmp); | |
1987 | ||
1988 | *frag = tmp; | |
2f7719ce | 1989 | |
1c2acffb GP |
1990 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1991 | return -EFAULT; | |
1da177e4 | 1992 | |
5e59b791 LAD |
1993 | (*frag)->priority = skb->priority; |
1994 | ||
1da177e4 LT |
1995 | sent += count; |
1996 | len -= count; | |
1997 | ||
2d0ed3d5 GP |
1998 | skb->len += (*frag)->len; |
1999 | skb->data_len += (*frag)->len; | |
2000 | ||
1da177e4 LT |
2001 | frag = &(*frag)->next; |
2002 | } | |
1da177e4 LT |
2003 | |
2004 | return sent; | |
1c2acffb | 2005 | } |
1da177e4 | 2006 | |
5e59b791 | 2007 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2008 | struct msghdr *msg, size_t len, |
2009 | u32 priority) | |
1c2acffb | 2010 | { |
8c1d787b | 2011 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2012 | struct sk_buff *skb; |
03a51213 | 2013 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2014 | struct l2cap_hdr *lh; |
2015 | ||
b4400672 | 2016 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2017 | |
2018 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2019 | |
2020 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2021 | msg->msg_flags & MSG_DONTWAIT); |
2022 | if (IS_ERR(skb)) | |
2023 | return skb; | |
1c2acffb | 2024 | |
5e59b791 LAD |
2025 | skb->priority = priority; |
2026 | ||
1c2acffb GP |
2027 | /* Create L2CAP header */ |
2028 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2029 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2030 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2031 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2032 | |
0952a57a | 2033 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2034 | if (unlikely(err < 0)) { |
2035 | kfree_skb(skb); | |
2036 | return ERR_PTR(err); | |
2037 | } | |
2038 | return skb; | |
2039 | } | |
2040 | ||
5e59b791 | 2041 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2042 | struct msghdr *msg, size_t len, |
2043 | u32 priority) | |
1c2acffb | 2044 | { |
8c1d787b | 2045 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2046 | struct sk_buff *skb; |
f2ba7fae | 2047 | int err, count; |
1c2acffb GP |
2048 | struct l2cap_hdr *lh; |
2049 | ||
b4400672 | 2050 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2051 | |
f2ba7fae | 2052 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2053 | |
f2ba7fae | 2054 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2055 | msg->msg_flags & MSG_DONTWAIT); |
2056 | if (IS_ERR(skb)) | |
2057 | return skb; | |
1c2acffb | 2058 | |
5e59b791 LAD |
2059 | skb->priority = priority; |
2060 | ||
1c2acffb GP |
2061 | /* Create L2CAP header */ |
2062 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2063 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2064 | lh->len = cpu_to_le16(len); |
1c2acffb | 2065 | |
0952a57a | 2066 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2067 | if (unlikely(err < 0)) { |
2068 | kfree_skb(skb); | |
2069 | return ERR_PTR(err); | |
2070 | } | |
2071 | return skb; | |
2072 | } | |
2073 | ||
ab0ff76d | 2074 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2075 | struct msghdr *msg, size_t len, |
2076 | u16 sdulen) | |
1c2acffb | 2077 | { |
8c1d787b | 2078 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2079 | struct sk_buff *skb; |
e4ca6d98 | 2080 | int err, count, hlen; |
1c2acffb GP |
2081 | struct l2cap_hdr *lh; |
2082 | ||
b4400672 | 2083 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2084 | |
0ee0d208 GP |
2085 | if (!conn) |
2086 | return ERR_PTR(-ENOTCONN); | |
2087 | ||
ba7aa64f | 2088 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2089 | |
c74e560c | 2090 | if (sdulen) |
03a51213 | 2091 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2092 | |
47d1ec61 | 2093 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2094 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2095 | |
1c2acffb | 2096 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2097 | |
2098 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2099 | msg->msg_flags & MSG_DONTWAIT); |
2100 | if (IS_ERR(skb)) | |
2101 | return skb; | |
1c2acffb GP |
2102 | |
2103 | /* Create L2CAP header */ | |
2104 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2105 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2106 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2107 | |
18a48e76 MM |
2108 | /* Control header is populated later */ |
2109 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2110 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2111 | else | |
2112 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2113 | |
c74e560c | 2114 | if (sdulen) |
03a51213 | 2115 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2116 | |
0952a57a | 2117 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2118 | if (unlikely(err < 0)) { |
2119 | kfree_skb(skb); | |
2120 | return ERR_PTR(err); | |
2121 | } | |
e90bac06 | 2122 | |
18a48e76 | 2123 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2124 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2125 | return skb; |
1da177e4 LT |
2126 | } |
2127 | ||
94122bbe MM |
2128 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2129 | struct sk_buff_head *seg_queue, | |
2130 | struct msghdr *msg, size_t len) | |
c74e560c | 2131 | { |
c74e560c | 2132 | struct sk_buff *skb; |
94122bbe MM |
2133 | u16 sdu_len; |
2134 | size_t pdu_len; | |
94122bbe | 2135 | u8 sar; |
c74e560c | 2136 | |
b4400672 | 2137 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2138 | |
94122bbe MM |
2139 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2140 | * so fragmented skbs are not used. The HCI layer's handling | |
2141 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2142 | */ | |
c74e560c | 2143 | |
94122bbe MM |
2144 | /* PDU size is derived from the HCI MTU */ |
2145 | pdu_len = chan->conn->mtu; | |
c74e560c | 2146 | |
94122bbe MM |
2147 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2148 | ||
2149 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2150 | if (chan->fcs) |
2151 | pdu_len -= L2CAP_FCS_SIZE; | |
2152 | ||
ba7aa64f | 2153 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2154 | |
2155 | /* Remote device may have requested smaller PDUs */ | |
2156 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2157 | ||
2158 | if (len <= pdu_len) { | |
2159 | sar = L2CAP_SAR_UNSEGMENTED; | |
2160 | sdu_len = 0; | |
2161 | pdu_len = len; | |
2162 | } else { | |
2163 | sar = L2CAP_SAR_START; | |
2164 | sdu_len = len; | |
2165 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2166 | } | |
2167 | ||
2168 | while (len > 0) { | |
2169 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2170 | |
c74e560c | 2171 | if (IS_ERR(skb)) { |
94122bbe | 2172 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2173 | return PTR_ERR(skb); |
2174 | } | |
2175 | ||
94122bbe MM |
2176 | bt_cb(skb)->control.sar = sar; |
2177 | __skb_queue_tail(seg_queue, skb); | |
2178 | ||
2179 | len -= pdu_len; | |
2180 | if (sdu_len) { | |
2181 | sdu_len = 0; | |
2182 | pdu_len += L2CAP_SDULEN_SIZE; | |
2183 | } | |
2184 | ||
2185 | if (len <= pdu_len) { | |
2186 | sar = L2CAP_SAR_END; | |
2187 | pdu_len = len; | |
2188 | } else { | |
2189 | sar = L2CAP_SAR_CONTINUE; | |
2190 | } | |
c74e560c | 2191 | } |
c74e560c | 2192 | |
f0f62799 | 2193 | return 0; |
c74e560c GP |
2194 | } |
2195 | ||
5e59b791 | 2196 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2197 | u32 priority) |
9a91a04a | 2198 | { |
9a91a04a | 2199 | struct sk_buff *skb; |
9a91a04a | 2200 | int err; |
94122bbe | 2201 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2202 | |
2203 | /* Connectionless channel */ | |
715ec005 | 2204 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2205 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2206 | if (IS_ERR(skb)) |
2207 | return PTR_ERR(skb); | |
2208 | ||
2209 | l2cap_do_send(chan, skb); | |
2210 | return len; | |
2211 | } | |
2212 | ||
2213 | switch (chan->mode) { | |
2214 | case L2CAP_MODE_BASIC: | |
2215 | /* Check outgoing MTU */ | |
2216 | if (len > chan->omtu) | |
2217 | return -EMSGSIZE; | |
2218 | ||
2219 | /* Create a basic PDU */ | |
5e59b791 | 2220 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2221 | if (IS_ERR(skb)) |
2222 | return PTR_ERR(skb); | |
2223 | ||
2224 | l2cap_do_send(chan, skb); | |
2225 | err = len; | |
2226 | break; | |
2227 | ||
2228 | case L2CAP_MODE_ERTM: | |
2229 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2230 | /* Check outgoing MTU */ |
2231 | if (len > chan->omtu) { | |
2232 | err = -EMSGSIZE; | |
2233 | break; | |
2234 | } | |
9a91a04a | 2235 | |
94122bbe | 2236 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2237 | |
94122bbe MM |
2238 | /* Do segmentation before calling in to the state machine, |
2239 | * since it's possible to block while waiting for memory | |
2240 | * allocation. | |
2241 | */ | |
2242 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2243 | |
94122bbe MM |
2244 | /* The channel could have been closed while segmenting, |
2245 | * check that it is still connected. | |
2246 | */ | |
2247 | if (chan->state != BT_CONNECTED) { | |
2248 | __skb_queue_purge(&seg_queue); | |
2249 | err = -ENOTCONN; | |
9a91a04a GP |
2250 | } |
2251 | ||
94122bbe | 2252 | if (err) |
9a91a04a | 2253 | break; |
9a91a04a | 2254 | |
3733937d | 2255 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2256 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2257 | else |
d660366d | 2258 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2259 | |
d660366d | 2260 | err = len; |
9a91a04a | 2261 | |
94122bbe MM |
2262 | /* If the skbs were not queued for sending, they'll still be in |
2263 | * seg_queue and need to be purged. | |
2264 | */ | |
2265 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2266 | break; |
2267 | ||
2268 | default: | |
2269 | BT_DBG("bad state %1.1x", chan->mode); | |
2270 | err = -EBADFD; | |
2271 | } | |
2272 | ||
2273 | return err; | |
2274 | } | |
2275 | ||
d2a7ac5d MM |
2276 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2277 | { | |
bed68bde MM |
2278 | struct l2cap_ctrl control; |
2279 | u16 seq; | |
2280 | ||
b4400672 | 2281 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2282 | |
2283 | memset(&control, 0, sizeof(control)); | |
2284 | control.sframe = 1; | |
2285 | control.super = L2CAP_SUPER_SREJ; | |
2286 | ||
2287 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2288 | seq = __next_seq(chan, seq)) { | |
2289 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2290 | control.reqseq = seq; | |
2291 | l2cap_send_sframe(chan, &control); | |
2292 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2297 | } |
2298 | ||
2299 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2300 | { | |
bed68bde MM |
2301 | struct l2cap_ctrl control; |
2302 | ||
2303 | BT_DBG("chan %p", chan); | |
2304 | ||
2305 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2306 | return; | |
2307 | ||
2308 | memset(&control, 0, sizeof(control)); | |
2309 | control.sframe = 1; | |
2310 | control.super = L2CAP_SUPER_SREJ; | |
2311 | control.reqseq = chan->srej_list.tail; | |
2312 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2313 | } |
2314 | ||
2315 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2316 | { | |
bed68bde MM |
2317 | struct l2cap_ctrl control; |
2318 | u16 initial_head; | |
2319 | u16 seq; | |
2320 | ||
b4400672 | 2321 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2322 | |
2323 | memset(&control, 0, sizeof(control)); | |
2324 | control.sframe = 1; | |
2325 | control.super = L2CAP_SUPER_SREJ; | |
2326 | ||
2327 | /* Capture initial list head to allow only one pass through the list. */ | |
2328 | initial_head = chan->srej_list.head; | |
2329 | ||
2330 | do { | |
2331 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2332 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2333 | break; | |
2334 | ||
2335 | control.reqseq = seq; | |
2336 | l2cap_send_sframe(chan, &control); | |
2337 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2338 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2339 | } |
2340 | ||
608bcc6d MM |
2341 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2342 | { | |
2343 | struct sk_buff *acked_skb; | |
2344 | u16 ackseq; | |
2345 | ||
b4400672 | 2346 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2347 | |
2348 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2349 | return; | |
2350 | ||
b4400672 | 2351 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2352 | chan->expected_ack_seq, chan->unacked_frames); |
2353 | ||
2354 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2355 | ackseq = __next_seq(chan, ackseq)) { | |
2356 | ||
2357 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2358 | if (acked_skb) { | |
2359 | skb_unlink(acked_skb, &chan->tx_q); | |
2360 | kfree_skb(acked_skb); | |
2361 | chan->unacked_frames--; | |
2362 | } | |
2363 | } | |
2364 | ||
2365 | chan->expected_ack_seq = reqseq; | |
2366 | ||
2367 | if (chan->unacked_frames == 0) | |
2368 | __clear_retrans_timer(chan); | |
2369 | ||
b4400672 | 2370 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2371 | } |
2372 | ||
2373 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2374 | { | |
2375 | BT_DBG("chan %p", chan); | |
2376 | ||
2377 | chan->expected_tx_seq = chan->buffer_seq; | |
2378 | l2cap_seq_list_clear(&chan->srej_list); | |
2379 | skb_queue_purge(&chan->srej_q); | |
2380 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2381 | } | |
2382 | ||
d660366d GP |
2383 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2384 | struct l2cap_ctrl *control, | |
2385 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2386 | { |
608bcc6d MM |
2387 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2388 | event); | |
2389 | ||
2390 | switch (event) { | |
2391 | case L2CAP_EV_DATA_REQUEST: | |
2392 | if (chan->tx_send_head == NULL) | |
2393 | chan->tx_send_head = skb_peek(skbs); | |
2394 | ||
2395 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2396 | l2cap_ertm_send(chan); | |
2397 | break; | |
2398 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2399 | BT_DBG("Enter LOCAL_BUSY"); | |
2400 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2401 | ||
2402 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2403 | /* The SREJ_SENT state must be aborted if we are to | |
2404 | * enter the LOCAL_BUSY state. | |
2405 | */ | |
2406 | l2cap_abort_rx_srej_sent(chan); | |
2407 | } | |
2408 | ||
2409 | l2cap_send_ack(chan); | |
2410 | ||
2411 | break; | |
2412 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2413 | BT_DBG("Exit LOCAL_BUSY"); | |
2414 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2415 | ||
2416 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2417 | struct l2cap_ctrl local_control; | |
2418 | ||
2419 | memset(&local_control, 0, sizeof(local_control)); | |
2420 | local_control.sframe = 1; | |
2421 | local_control.super = L2CAP_SUPER_RR; | |
2422 | local_control.poll = 1; | |
2423 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2424 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2425 | |
2426 | chan->retry_count = 1; | |
2427 | __set_monitor_timer(chan); | |
2428 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2429 | } | |
2430 | break; | |
2431 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2432 | l2cap_process_reqseq(chan, control->reqseq); | |
2433 | break; | |
2434 | case L2CAP_EV_EXPLICIT_POLL: | |
2435 | l2cap_send_rr_or_rnr(chan, 1); | |
2436 | chan->retry_count = 1; | |
2437 | __set_monitor_timer(chan); | |
2438 | __clear_ack_timer(chan); | |
2439 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2440 | break; | |
2441 | case L2CAP_EV_RETRANS_TO: | |
2442 | l2cap_send_rr_or_rnr(chan, 1); | |
2443 | chan->retry_count = 1; | |
2444 | __set_monitor_timer(chan); | |
2445 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2446 | break; | |
2447 | case L2CAP_EV_RECV_FBIT: | |
2448 | /* Nothing to process */ | |
2449 | break; | |
2450 | default: | |
2451 | break; | |
2452 | } | |
608bcc6d MM |
2453 | } |
2454 | ||
d660366d GP |
2455 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2456 | struct l2cap_ctrl *control, | |
2457 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2458 | { |
608bcc6d MM |
2459 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2460 | event); | |
2461 | ||
2462 | switch (event) { | |
2463 | case L2CAP_EV_DATA_REQUEST: | |
2464 | if (chan->tx_send_head == NULL) | |
2465 | chan->tx_send_head = skb_peek(skbs); | |
2466 | /* Queue data, but don't send. */ | |
2467 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2468 | break; | |
2469 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2470 | BT_DBG("Enter LOCAL_BUSY"); | |
2471 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2472 | ||
2473 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2474 | /* The SREJ_SENT state must be aborted if we are to | |
2475 | * enter the LOCAL_BUSY state. | |
2476 | */ | |
2477 | l2cap_abort_rx_srej_sent(chan); | |
2478 | } | |
2479 | ||
2480 | l2cap_send_ack(chan); | |
2481 | ||
2482 | break; | |
2483 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2484 | BT_DBG("Exit LOCAL_BUSY"); | |
2485 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2486 | ||
2487 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2488 | struct l2cap_ctrl local_control; | |
2489 | memset(&local_control, 0, sizeof(local_control)); | |
2490 | local_control.sframe = 1; | |
2491 | local_control.super = L2CAP_SUPER_RR; | |
2492 | local_control.poll = 1; | |
2493 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2494 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2495 | |
2496 | chan->retry_count = 1; | |
2497 | __set_monitor_timer(chan); | |
2498 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2499 | } | |
2500 | break; | |
2501 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2502 | l2cap_process_reqseq(chan, control->reqseq); | |
2503 | ||
2504 | /* Fall through */ | |
2505 | ||
2506 | case L2CAP_EV_RECV_FBIT: | |
2507 | if (control && control->final) { | |
2508 | __clear_monitor_timer(chan); | |
2509 | if (chan->unacked_frames > 0) | |
2510 | __set_retrans_timer(chan); | |
2511 | chan->retry_count = 0; | |
2512 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2513 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2514 | } | |
2515 | break; | |
2516 | case L2CAP_EV_EXPLICIT_POLL: | |
2517 | /* Ignore */ | |
2518 | break; | |
2519 | case L2CAP_EV_MONITOR_TO: | |
2520 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2521 | l2cap_send_rr_or_rnr(chan, 1); | |
2522 | __set_monitor_timer(chan); | |
2523 | chan->retry_count++; | |
2524 | } else { | |
2525 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2526 | } | |
2527 | break; | |
2528 | default: | |
2529 | break; | |
2530 | } | |
608bcc6d MM |
2531 | } |
2532 | ||
d660366d GP |
2533 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2534 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2535 | { |
608bcc6d MM |
2536 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2537 | chan, control, skbs, event, chan->tx_state); | |
2538 | ||
2539 | switch (chan->tx_state) { | |
2540 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2541 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2542 | break; |
2543 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2544 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2545 | break; |
2546 | default: | |
2547 | /* Ignore event */ | |
2548 | break; | |
2549 | } | |
608bcc6d MM |
2550 | } |
2551 | ||
4b51dae9 MM |
2552 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2553 | struct l2cap_ctrl *control) | |
2554 | { | |
2555 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2556 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2557 | } |
2558 | ||
f80842a8 MM |
2559 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2560 | struct l2cap_ctrl *control) | |
2561 | { | |
2562 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2563 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2564 | } |
2565 | ||
1da177e4 LT |
2566 | /* Copy frame to all raw sockets on that connection */ |
2567 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2568 | { | |
1da177e4 | 2569 | struct sk_buff *nskb; |
48454079 | 2570 | struct l2cap_chan *chan; |
1da177e4 LT |
2571 | |
2572 | BT_DBG("conn %p", conn); | |
2573 | ||
3df91ea2 | 2574 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2575 | |
3df91ea2 | 2576 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2577 | struct sock *sk = chan->sk; |
715ec005 | 2578 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2579 | continue; |
2580 | ||
2581 | /* Don't send frame to the socket it came from */ | |
2582 | if (skb->sk == sk) | |
2583 | continue; | |
8bcde1f2 | 2584 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2585 | if (!nskb) |
1da177e4 LT |
2586 | continue; |
2587 | ||
80b98027 | 2588 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2589 | kfree_skb(nskb); |
2590 | } | |
3d57dc68 | 2591 | |
3df91ea2 | 2592 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2593 | } |
2594 | ||
2595 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2596 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2597 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2598 | { |
2599 | struct sk_buff *skb, **frag; | |
2600 | struct l2cap_cmd_hdr *cmd; | |
2601 | struct l2cap_hdr *lh; | |
2602 | int len, count; | |
2603 | ||
b4400672 AE |
2604 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2605 | conn, code, ident, dlen); | |
1da177e4 LT |
2606 | |
2607 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2608 | count = min_t(unsigned int, conn->mtu, len); | |
2609 | ||
8bcde1f2 | 2610 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2611 | if (!skb) |
2612 | return NULL; | |
2613 | ||
2614 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2615 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2616 | |
2617 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2618 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2619 | else |
ac73498c | 2620 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2621 | |
2622 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2623 | cmd->code = code; | |
2624 | cmd->ident = ident; | |
aca3192c | 2625 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2626 | |
2627 | if (dlen) { | |
2628 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2629 | memcpy(skb_put(skb, count), data, count); | |
2630 | data += count; | |
2631 | } | |
2632 | ||
2633 | len -= skb->len; | |
2634 | ||
2635 | /* Continuation fragments (no L2CAP header) */ | |
2636 | frag = &skb_shinfo(skb)->frag_list; | |
2637 | while (len) { | |
2638 | count = min_t(unsigned int, conn->mtu, len); | |
2639 | ||
8bcde1f2 | 2640 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2641 | if (!*frag) |
2642 | goto fail; | |
2643 | ||
2644 | memcpy(skb_put(*frag, count), data, count); | |
2645 | ||
2646 | len -= count; | |
2647 | data += count; | |
2648 | ||
2649 | frag = &(*frag)->next; | |
2650 | } | |
2651 | ||
2652 | return skb; | |
2653 | ||
2654 | fail: | |
2655 | kfree_skb(skb); | |
2656 | return NULL; | |
2657 | } | |
2658 | ||
2d792818 GP |
2659 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2660 | unsigned long *val) | |
1da177e4 LT |
2661 | { |
2662 | struct l2cap_conf_opt *opt = *ptr; | |
2663 | int len; | |
2664 | ||
2665 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2666 | *ptr += len; | |
2667 | ||
2668 | *type = opt->type; | |
2669 | *olen = opt->len; | |
2670 | ||
2671 | switch (opt->len) { | |
2672 | case 1: | |
2673 | *val = *((u8 *) opt->val); | |
2674 | break; | |
2675 | ||
2676 | case 2: | |
bfaaeb3e | 2677 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2678 | break; |
2679 | ||
2680 | case 4: | |
bfaaeb3e | 2681 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2682 | break; |
2683 | ||
2684 | default: | |
2685 | *val = (unsigned long) opt->val; | |
2686 | break; | |
2687 | } | |
2688 | ||
b4400672 | 2689 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2690 | return len; |
2691 | } | |
2692 | ||
1da177e4 LT |
2693 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2694 | { | |
2695 | struct l2cap_conf_opt *opt = *ptr; | |
2696 | ||
b4400672 | 2697 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2698 | |
2699 | opt->type = type; | |
2700 | opt->len = len; | |
2701 | ||
2702 | switch (len) { | |
2703 | case 1: | |
2704 | *((u8 *) opt->val) = val; | |
2705 | break; | |
2706 | ||
2707 | case 2: | |
4f8b691c | 2708 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2709 | break; |
2710 | ||
2711 | case 4: | |
4f8b691c | 2712 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2713 | break; |
2714 | ||
2715 | default: | |
2716 | memcpy(opt->val, (void *) val, len); | |
2717 | break; | |
2718 | } | |
2719 | ||
2720 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2721 | } | |
2722 | ||
f89cef09 AE |
2723 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2724 | { | |
2725 | struct l2cap_conf_efs efs; | |
2726 | ||
1ec918ce | 2727 | switch (chan->mode) { |
f89cef09 AE |
2728 | case L2CAP_MODE_ERTM: |
2729 | efs.id = chan->local_id; | |
2730 | efs.stype = chan->local_stype; | |
2731 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2732 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2733 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2734 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2735 | break; |
2736 | ||
2737 | case L2CAP_MODE_STREAMING: | |
2738 | efs.id = 1; | |
2739 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2740 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2741 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2742 | efs.acc_lat = 0; | |
2743 | efs.flush_to = 0; | |
2744 | break; | |
2745 | ||
2746 | default: | |
2747 | return; | |
2748 | } | |
2749 | ||
2750 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2751 | (unsigned long) &efs); |
f89cef09 AE |
2752 | } |
2753 | ||
721c4181 | 2754 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2755 | { |
721c4181 | 2756 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2757 | ack_timer.work); |
2758 | u16 frames_to_ack; | |
c1b4f43b | 2759 | |
2fb9b3d4 GP |
2760 | BT_DBG("chan %p", chan); |
2761 | ||
6be36555 AE |
2762 | l2cap_chan_lock(chan); |
2763 | ||
0362520b MM |
2764 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2765 | chan->last_acked_seq); | |
6be36555 | 2766 | |
0362520b MM |
2767 | if (frames_to_ack) |
2768 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2769 | |
0362520b | 2770 | l2cap_chan_unlock(chan); |
09bfb2ee | 2771 | l2cap_chan_put(chan); |
c1b4f43b GP |
2772 | } |
2773 | ||
466f8004 | 2774 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2775 | { |
3c588192 MM |
2776 | int err; |
2777 | ||
105bdf9e MM |
2778 | chan->next_tx_seq = 0; |
2779 | chan->expected_tx_seq = 0; | |
42e5c802 | 2780 | chan->expected_ack_seq = 0; |
6a026610 | 2781 | chan->unacked_frames = 0; |
42e5c802 | 2782 | chan->buffer_seq = 0; |
6a026610 | 2783 | chan->frames_sent = 0; |
105bdf9e MM |
2784 | chan->last_acked_seq = 0; |
2785 | chan->sdu = NULL; | |
2786 | chan->sdu_last_frag = NULL; | |
2787 | chan->sdu_len = 0; | |
2788 | ||
d34c34fb MM |
2789 | skb_queue_head_init(&chan->tx_q); |
2790 | ||
08333283 MM |
2791 | chan->local_amp_id = 0; |
2792 | chan->move_id = 0; | |
2793 | chan->move_state = L2CAP_MOVE_STABLE; | |
2794 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
2795 | ||
105bdf9e MM |
2796 | if (chan->mode != L2CAP_MODE_ERTM) |
2797 | return 0; | |
2798 | ||
2799 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2800 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2801 | |
721c4181 GP |
2802 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2803 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2804 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2805 | |
f1c6775b | 2806 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2807 | |
3c588192 MM |
2808 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2809 | if (err < 0) | |
2810 | return err; | |
2811 | ||
9dc9affc MM |
2812 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2813 | if (err < 0) | |
2814 | l2cap_seq_list_free(&chan->srej_list); | |
2815 | ||
2816 | return err; | |
0565c1c2 GP |
2817 | } |
2818 | ||
f2fcfcd6 GP |
2819 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2820 | { | |
2821 | switch (mode) { | |
2822 | case L2CAP_MODE_STREAMING: | |
2823 | case L2CAP_MODE_ERTM: | |
2824 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2825 | return mode; | |
2826 | /* fall through */ | |
2827 | default: | |
2828 | return L2CAP_MODE_BASIC; | |
2829 | } | |
2830 | } | |
2831 | ||
6327eb98 AE |
2832 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2833 | { | |
2834 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2835 | } | |
2836 | ||
f89cef09 AE |
2837 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2838 | { | |
2839 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2840 | } | |
2841 | ||
6327eb98 AE |
2842 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2843 | { | |
2844 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
2d792818 | 2845 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2846 | /* use extended control field */ |
2847 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2848 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2849 | } else { | |
6327eb98 | 2850 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 2851 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
2852 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2853 | } | |
c20f8e35 | 2854 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2855 | } |
2856 | ||
710f9b0a | 2857 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2858 | { |
1da177e4 | 2859 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2860 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2861 | void *ptr = req->data; |
c8f79162 | 2862 | u16 size; |
1da177e4 | 2863 | |
49208c9c | 2864 | BT_DBG("chan %p", chan); |
1da177e4 | 2865 | |
73ffa904 | 2866 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2867 | goto done; |
2868 | ||
0c1bc5c6 | 2869 | switch (chan->mode) { |
f2fcfcd6 GP |
2870 | case L2CAP_MODE_STREAMING: |
2871 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2872 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2873 | break; |
85eb53c6 | 2874 | |
f89cef09 AE |
2875 | if (__l2cap_efs_supported(chan)) |
2876 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2877 | ||
2ba13ed6 | 2878 | /* fall through */ |
f2fcfcd6 | 2879 | default: |
8c1d787b | 2880 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2881 | break; |
2882 | } | |
2883 | ||
2884 | done: | |
0c1bc5c6 GP |
2885 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2886 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2887 | |
0c1bc5c6 | 2888 | switch (chan->mode) { |
65c7c491 | 2889 | case L2CAP_MODE_BASIC: |
8c1d787b | 2890 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 2891 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
2892 | break; |
2893 | ||
62547752 GP |
2894 | rfc.mode = L2CAP_MODE_BASIC; |
2895 | rfc.txwin_size = 0; | |
2896 | rfc.max_transmit = 0; | |
2897 | rfc.retrans_timeout = 0; | |
2898 | rfc.monitor_timeout = 0; | |
2899 | rfc.max_pdu_size = 0; | |
2900 | ||
63406504 | 2901 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2902 | (unsigned long) &rfc); |
65c7c491 MH |
2903 | break; |
2904 | ||
2905 | case L2CAP_MODE_ERTM: | |
2906 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2907 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2908 | rfc.retrans_timeout = 0; |
2909 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2910 | |
2911 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2912 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2913 | L2CAP_FCS_SIZE); | |
c8f79162 | 2914 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 2915 | |
6327eb98 AE |
2916 | l2cap_txwin_setup(chan); |
2917 | ||
2918 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 2919 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 2920 | |
63406504 | 2921 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2922 | (unsigned long) &rfc); |
63406504 | 2923 | |
f89cef09 AE |
2924 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2925 | l2cap_add_opt_efs(&ptr, chan); | |
2926 | ||
8c1d787b | 2927 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2928 | break; |
2929 | ||
47d1ec61 | 2930 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2931 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2932 | chan->fcs = L2CAP_FCS_NONE; |
2933 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2934 | } |
6327eb98 AE |
2935 | |
2936 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2937 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 2938 | chan->tx_win); |
f2fcfcd6 GP |
2939 | break; |
2940 | ||
2941 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2942 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2943 | rfc.mode = L2CAP_MODE_STREAMING; |
2944 | rfc.txwin_size = 0; | |
2945 | rfc.max_transmit = 0; | |
2946 | rfc.retrans_timeout = 0; | |
2947 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2948 | |
2949 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
2950 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
2951 | L2CAP_FCS_SIZE); | |
c8f79162 | 2952 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 2953 | |
63406504 | 2954 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 2955 | (unsigned long) &rfc); |
63406504 | 2956 | |
f89cef09 AE |
2957 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2958 | l2cap_add_opt_efs(&ptr, chan); | |
2959 | ||
8c1d787b | 2960 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2961 | break; |
2962 | ||
47d1ec61 | 2963 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 2964 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2965 | chan->fcs = L2CAP_FCS_NONE; |
2966 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2967 | } |
65c7c491 MH |
2968 | break; |
2969 | } | |
1da177e4 | 2970 | |
fe4128e0 | 2971 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2972 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2973 | |
2974 | return ptr - data; | |
2975 | } | |
2976 | ||
73ffa904 | 2977 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2978 | { |
5dee9e7c MH |
2979 | struct l2cap_conf_rsp *rsp = data; |
2980 | void *ptr = rsp->data; | |
73ffa904 GP |
2981 | void *req = chan->conf_req; |
2982 | int len = chan->conf_len; | |
5dee9e7c MH |
2983 | int type, hint, olen; |
2984 | unsigned long val; | |
6464f35f | 2985 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2986 | struct l2cap_conf_efs efs; |
2987 | u8 remote_efs = 0; | |
861d6882 | 2988 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2989 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2990 | u16 size; |
1da177e4 | 2991 | |
73ffa904 | 2992 | BT_DBG("chan %p", chan); |
820ae1b8 | 2993 | |
5dee9e7c MH |
2994 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2995 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2996 | |
589d2746 | 2997 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2998 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2999 | |
3000 | switch (type) { | |
3001 | case L2CAP_CONF_MTU: | |
861d6882 | 3002 | mtu = val; |
5dee9e7c MH |
3003 | break; |
3004 | ||
3005 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3006 | chan->flush_to = val; |
5dee9e7c MH |
3007 | break; |
3008 | ||
3009 | case L2CAP_CONF_QOS: | |
3010 | break; | |
3011 | ||
6464f35f MH |
3012 | case L2CAP_CONF_RFC: |
3013 | if (olen == sizeof(rfc)) | |
3014 | memcpy(&rfc, (void *) val, olen); | |
3015 | break; | |
3016 | ||
fcc203c3 GP |
3017 | case L2CAP_CONF_FCS: |
3018 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3019 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3020 | break; |
fcc203c3 | 3021 | |
42dceae2 AE |
3022 | case L2CAP_CONF_EFS: |
3023 | remote_efs = 1; | |
3024 | if (olen == sizeof(efs)) | |
3025 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3026 | break; |
3027 | ||
6327eb98 AE |
3028 | case L2CAP_CONF_EWS: |
3029 | if (!enable_hs) | |
3030 | return -ECONNREFUSED; | |
fcc203c3 | 3031 | |
6327eb98 AE |
3032 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3033 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3034 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3035 | chan->remote_tx_win = val; |
fcc203c3 GP |
3036 | break; |
3037 | ||
5dee9e7c MH |
3038 | default: |
3039 | if (hint) | |
3040 | break; | |
3041 | ||
3042 | result = L2CAP_CONF_UNKNOWN; | |
3043 | *((u8 *) ptr++) = type; | |
3044 | break; | |
3045 | } | |
3046 | } | |
3047 | ||
73ffa904 | 3048 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3049 | goto done; |
3050 | ||
0c1bc5c6 | 3051 | switch (chan->mode) { |
f2fcfcd6 GP |
3052 | case L2CAP_MODE_STREAMING: |
3053 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3054 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3055 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3056 | chan->conn->feat_mask); |
85eb53c6 GP |
3057 | break; |
3058 | } | |
3059 | ||
42dceae2 AE |
3060 | if (remote_efs) { |
3061 | if (__l2cap_efs_supported(chan)) | |
3062 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3063 | else | |
3064 | return -ECONNREFUSED; | |
3065 | } | |
3066 | ||
0c1bc5c6 | 3067 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3068 | return -ECONNREFUSED; |
742e519b | 3069 | |
f2fcfcd6 | 3070 | break; |
f2fcfcd6 GP |
3071 | } |
3072 | ||
3073 | done: | |
0c1bc5c6 | 3074 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3075 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3076 | rfc.mode = chan->mode; |
f2fcfcd6 | 3077 | |
73ffa904 | 3078 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3079 | return -ECONNREFUSED; |
3080 | ||
2d792818 GP |
3081 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3082 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3083 | } |
3084 | ||
5dee9e7c MH |
3085 | if (result == L2CAP_CONF_SUCCESS) { |
3086 | /* Configure output options and let the other side know | |
3087 | * which ones we don't like. */ | |
3088 | ||
f2fcfcd6 GP |
3089 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3090 | result = L2CAP_CONF_UNACCEPT; | |
3091 | else { | |
0c1bc5c6 | 3092 | chan->omtu = mtu; |
c1360a1c | 3093 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3094 | } |
0c1bc5c6 | 3095 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3096 | |
42dceae2 AE |
3097 | if (remote_efs) { |
3098 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3099 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3100 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3101 | |
3102 | result = L2CAP_CONF_UNACCEPT; | |
3103 | ||
3104 | if (chan->num_conf_req >= 1) | |
3105 | return -ECONNREFUSED; | |
3106 | ||
3107 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3108 | sizeof(efs), |
3109 | (unsigned long) &efs); | |
0e8b207e | 3110 | } else { |
3e6b3b95 | 3111 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3112 | result = L2CAP_CONF_PENDING; |
3113 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3114 | } |
3115 | } | |
3116 | ||
f2fcfcd6 GP |
3117 | switch (rfc.mode) { |
3118 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3119 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3120 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3121 | break; |
3122 | ||
3123 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3124 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3125 | chan->remote_tx_win = rfc.txwin_size; | |
3126 | else | |
3127 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3128 | |
2c03a7a4 | 3129 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3130 | |
c8f79162 | 3131 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3132 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3133 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3134 | rfc.max_pdu_size = cpu_to_le16(size); |
3135 | chan->remote_mps = size; | |
f2fcfcd6 | 3136 | |
10467e9e | 3137 | rfc.retrans_timeout = |
4fd21a88 | 3138 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3139 | rfc.monitor_timeout = |
4fd21a88 | 3140 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3141 | |
c1360a1c | 3142 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3143 | |
3144 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3145 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3146 | |
42dceae2 AE |
3147 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3148 | chan->remote_id = efs.id; | |
3149 | chan->remote_stype = efs.stype; | |
3150 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3151 | chan->remote_flush_to = | |
2d792818 | 3152 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3153 | chan->remote_acc_lat = |
2d792818 | 3154 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3155 | chan->remote_sdu_itime = |
3156 | le32_to_cpu(efs.sdu_itime); | |
3157 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3158 | sizeof(efs), |
3159 | (unsigned long) &efs); | |
42dceae2 | 3160 | } |
f2fcfcd6 GP |
3161 | break; |
3162 | ||
3163 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3164 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3165 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3166 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3167 | rfc.max_pdu_size = cpu_to_le16(size); |
3168 | chan->remote_mps = size; | |
f2fcfcd6 | 3169 | |
c1360a1c | 3170 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3171 | |
2d792818 GP |
3172 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3173 | (unsigned long) &rfc); | |
68ae6639 | 3174 | |
f2fcfcd6 GP |
3175 | break; |
3176 | ||
3177 | default: | |
5dee9e7c | 3178 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3179 | |
6464f35f | 3180 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3181 | rfc.mode = chan->mode; |
f2fcfcd6 | 3182 | } |
6464f35f | 3183 | |
f2fcfcd6 | 3184 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3185 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3186 | } |
fe4128e0 | 3187 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3188 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3189 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3190 | |
3191 | return ptr - data; | |
1da177e4 LT |
3192 | } |
3193 | ||
2d792818 GP |
3194 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3195 | void *data, u16 *result) | |
f2fcfcd6 | 3196 | { |
f2fcfcd6 GP |
3197 | struct l2cap_conf_req *req = data; |
3198 | void *ptr = req->data; | |
3199 | int type, olen; | |
3200 | unsigned long val; | |
36e999a8 | 3201 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3202 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3203 | |
fe4128e0 | 3204 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3205 | |
3206 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3207 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3208 | ||
3209 | switch (type) { | |
3210 | case L2CAP_CONF_MTU: | |
3211 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3212 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3213 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3214 | } else |
0c1bc5c6 GP |
3215 | chan->imtu = val; |
3216 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3217 | break; |
3218 | ||
3219 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3220 | chan->flush_to = val; |
f2fcfcd6 | 3221 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3222 | 2, chan->flush_to); |
f2fcfcd6 GP |
3223 | break; |
3224 | ||
3225 | case L2CAP_CONF_RFC: | |
3226 | if (olen == sizeof(rfc)) | |
3227 | memcpy(&rfc, (void *)val, olen); | |
3228 | ||
c1360a1c | 3229 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3230 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3231 | return -ECONNREFUSED; |
3232 | ||
47d1ec61 | 3233 | chan->fcs = 0; |
f2fcfcd6 GP |
3234 | |
3235 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3236 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3237 | break; |
6327eb98 AE |
3238 | |
3239 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3240 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3241 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3242 | chan->tx_win); |
6327eb98 | 3243 | break; |
66af7aaf AE |
3244 | |
3245 | case L2CAP_CONF_EFS: | |
3246 | if (olen == sizeof(efs)) | |
3247 | memcpy(&efs, (void *)val, olen); | |
3248 | ||
3249 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3250 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3251 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3252 | return -ECONNREFUSED; |
3253 | ||
2d792818 GP |
3254 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3255 | (unsigned long) &efs); | |
66af7aaf | 3256 | break; |
f2fcfcd6 GP |
3257 | } |
3258 | } | |
3259 | ||
0c1bc5c6 | 3260 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3261 | return -ECONNREFUSED; |
3262 | ||
0c1bc5c6 | 3263 | chan->mode = rfc.mode; |
6c2ea7a8 | 3264 | |
0e8b207e | 3265 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3266 | switch (rfc.mode) { |
3267 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3268 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3269 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3270 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3271 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3272 | chan->ack_win = min_t(u16, chan->ack_win, | |
3273 | rfc.txwin_size); | |
66af7aaf AE |
3274 | |
3275 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3276 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3277 | chan->local_sdu_itime = | |
2d792818 | 3278 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3279 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3280 | chan->local_flush_to = | |
2d792818 | 3281 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3282 | } |
f2fcfcd6 | 3283 | break; |
66af7aaf | 3284 | |
f2fcfcd6 | 3285 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3286 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3287 | } |
3288 | } | |
3289 | ||
fe4128e0 | 3290 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3291 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3292 | |
3293 | return ptr - data; | |
3294 | } | |
3295 | ||
2d792818 GP |
3296 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3297 | u16 result, u16 flags) | |
1da177e4 LT |
3298 | { |
3299 | struct l2cap_conf_rsp *rsp = data; | |
3300 | void *ptr = rsp->data; | |
1da177e4 | 3301 | |
fe4128e0 | 3302 | BT_DBG("chan %p", chan); |
1da177e4 | 3303 | |
fe4128e0 | 3304 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3305 | rsp->result = cpu_to_le16(result); |
aca3192c | 3306 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3307 | |
3308 | return ptr - data; | |
3309 | } | |
3310 | ||
8c1d787b | 3311 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3312 | { |
3313 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3314 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3315 | u8 buf[128]; |
3316 | ||
fe4128e0 GP |
3317 | rsp.scid = cpu_to_le16(chan->dcid); |
3318 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3319 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3320 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
2d792818 | 3321 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
710f9b0a | 3322 | |
c1360a1c | 3323 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3324 | return; |
3325 | ||
710f9b0a | 3326 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3327 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3328 | chan->num_conf_req++; |
3329 | } | |
3330 | ||
47d1ec61 | 3331 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3332 | { |
7b1c0049 GP |
3333 | int type, olen; |
3334 | unsigned long val; | |
c20f8e35 MM |
3335 | /* Use sane default values in case a misbehaving remote device |
3336 | * did not send an RFC or extended window size option. | |
3337 | */ | |
3338 | u16 txwin_ext = chan->ack_win; | |
3339 | struct l2cap_conf_rfc rfc = { | |
3340 | .mode = chan->mode, | |
3341 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3342 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3343 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3344 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3345 | }; | |
7b1c0049 | 3346 | |
47d1ec61 | 3347 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3348 | |
0c1bc5c6 | 3349 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3350 | return; |
3351 | ||
3352 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3353 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3354 | ||
c20f8e35 MM |
3355 | switch (type) { |
3356 | case L2CAP_CONF_RFC: | |
3357 | if (olen == sizeof(rfc)) | |
3358 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3359 | break; |
c20f8e35 MM |
3360 | case L2CAP_CONF_EWS: |
3361 | txwin_ext = val; | |
3362 | break; | |
3363 | } | |
7b1c0049 GP |
3364 | } |
3365 | ||
7b1c0049 GP |
3366 | switch (rfc.mode) { |
3367 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3368 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3369 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3370 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3371 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3372 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3373 | else | |
3374 | chan->ack_win = min_t(u16, chan->ack_win, | |
3375 | rfc.txwin_size); | |
7b1c0049 GP |
3376 | break; |
3377 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3378 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3379 | } |
3380 | } | |
3381 | ||
2d792818 GP |
3382 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
3383 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4e8402a3 | 3384 | { |
e2fd318e | 3385 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3386 | |
e2fd318e | 3387 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3388 | return 0; |
3389 | ||
3390 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3391 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3392 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3393 | |
3394 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3395 | conn->info_ident = 0; |
984947dc | 3396 | |
4e8402a3 MH |
3397 | l2cap_conn_start(conn); |
3398 | } | |
3399 | ||
3400 | return 0; | |
3401 | } | |
3402 | ||
1700915f MM |
3403 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3404 | struct l2cap_cmd_hdr *cmd, | |
3405 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3406 | { |
1da177e4 LT |
3407 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3408 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3409 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3410 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3411 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3412 | |
3413 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3414 | __le16 psm = req->psm; |
1da177e4 | 3415 | |
097db76c | 3416 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3417 | |
3418 | /* Check if we have socket listening on psm */ | |
c2287681 | 3419 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3420 | if (!pchan) { |
1da177e4 LT |
3421 | result = L2CAP_CR_BAD_PSM; |
3422 | goto sendresp; | |
3423 | } | |
3424 | ||
23691d75 GP |
3425 | parent = pchan->sk; |
3426 | ||
3df91ea2 | 3427 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3428 | lock_sock(parent); |
e0f0cb56 | 3429 | |
e7c29cb1 | 3430 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3431 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3432 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3433 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3434 | result = L2CAP_CR_SEC_BLOCK; |
3435 | goto response; | |
3436 | } | |
3437 | ||
1da177e4 LT |
3438 | result = L2CAP_CR_NO_MEM; |
3439 | ||
2dfa1003 GP |
3440 | /* Check if we already have channel with that dcid */ |
3441 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3442 | goto response; | |
3443 | ||
80b98027 | 3444 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3445 | if (!chan) |
1da177e4 LT |
3446 | goto response; |
3447 | ||
80808e43 GP |
3448 | sk = chan->sk; |
3449 | ||
1da177e4 LT |
3450 | hci_conn_hold(conn->hcon); |
3451 | ||
1da177e4 LT |
3452 | bacpy(&bt_sk(sk)->src, conn->src); |
3453 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3454 | chan->psm = psm; |
3455 | chan->dcid = scid; | |
1700915f | 3456 | chan->local_amp_id = amp_id; |
1da177e4 | 3457 | |
6be36555 | 3458 | __l2cap_chan_add(conn, chan); |
48454079 | 3459 | |
fe4128e0 | 3460 | dcid = chan->scid; |
1da177e4 | 3461 | |
c9b66675 | 3462 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3463 | |
fc7f8a7e | 3464 | chan->ident = cmd->ident; |
1da177e4 | 3465 | |
984947dc | 3466 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3467 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3468 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3469 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3470 | result = L2CAP_CR_PEND; |
3471 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3472 | chan->ops->defer(chan); |
f66dc81f | 3473 | } else { |
1700915f MM |
3474 | /* Force pending result for AMP controllers. |
3475 | * The connection will succeed after the | |
3476 | * physical link is up. | |
3477 | */ | |
3478 | if (amp_id) { | |
3479 | __l2cap_state_change(chan, BT_CONNECT2); | |
3480 | result = L2CAP_CR_PEND; | |
3481 | } else { | |
3482 | __l2cap_state_change(chan, BT_CONFIG); | |
3483 | result = L2CAP_CR_SUCCESS; | |
3484 | } | |
f66dc81f MH |
3485 | status = L2CAP_CS_NO_INFO; |
3486 | } | |
79d554a6 | 3487 | } else { |
0e587be7 | 3488 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3489 | result = L2CAP_CR_PEND; |
3490 | status = L2CAP_CS_AUTHEN_PEND; | |
3491 | } | |
3492 | } else { | |
0e587be7 | 3493 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3494 | result = L2CAP_CR_PEND; |
3495 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3496 | } |
3497 | ||
1da177e4 | 3498 | response: |
aa2ac881 | 3499 | release_sock(parent); |
3df91ea2 | 3500 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3501 | |
3502 | sendresp: | |
aca3192c YH |
3503 | rsp.scid = cpu_to_le16(scid); |
3504 | rsp.dcid = cpu_to_le16(dcid); | |
3505 | rsp.result = cpu_to_le16(result); | |
3506 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3507 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3508 | |
3509 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3510 | struct l2cap_info_req info; | |
ac73498c | 3511 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3512 | |
3513 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3514 | conn->info_ident = l2cap_get_ident(conn); | |
3515 | ||
ba13ccd9 | 3516 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3517 | |
2d792818 GP |
3518 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3519 | sizeof(info), &info); | |
79d554a6 MH |
3520 | } |
3521 | ||
c1360a1c | 3522 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3523 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3524 | u8 buf[128]; |
c1360a1c | 3525 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3526 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3527 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3528 | chan->num_conf_req++; |
e9aeb2dd | 3529 | } |
1700915f MM |
3530 | |
3531 | return chan; | |
4c89b6aa | 3532 | } |
e9aeb2dd | 3533 | |
4c89b6aa MM |
3534 | static int l2cap_connect_req(struct l2cap_conn *conn, |
3535 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3536 | { | |
300229f9 | 3537 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3538 | return 0; |
3539 | } | |
3540 | ||
5909cf30 | 3541 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
2d792818 | 3542 | struct l2cap_cmd_hdr *cmd, u8 *data) |
1da177e4 LT |
3543 | { |
3544 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3545 | u16 scid, dcid, result, status; | |
48454079 | 3546 | struct l2cap_chan *chan; |
1da177e4 | 3547 | u8 req[128]; |
3df91ea2 | 3548 | int err; |
1da177e4 LT |
3549 | |
3550 | scid = __le16_to_cpu(rsp->scid); | |
3551 | dcid = __le16_to_cpu(rsp->dcid); | |
3552 | result = __le16_to_cpu(rsp->result); | |
3553 | status = __le16_to_cpu(rsp->status); | |
3554 | ||
1b009c98 | 3555 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3556 | dcid, scid, result, status); |
1da177e4 | 3557 | |
3df91ea2 AE |
3558 | mutex_lock(&conn->chan_lock); |
3559 | ||
1da177e4 | 3560 | if (scid) { |
3df91ea2 AE |
3561 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3562 | if (!chan) { | |
3563 | err = -EFAULT; | |
3564 | goto unlock; | |
3565 | } | |
1da177e4 | 3566 | } else { |
3df91ea2 AE |
3567 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3568 | if (!chan) { | |
3569 | err = -EFAULT; | |
3570 | goto unlock; | |
3571 | } | |
1da177e4 LT |
3572 | } |
3573 | ||
3df91ea2 AE |
3574 | err = 0; |
3575 | ||
6be36555 | 3576 | l2cap_chan_lock(chan); |
48454079 | 3577 | |
1da177e4 LT |
3578 | switch (result) { |
3579 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3580 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3581 | chan->ident = 0; |
fe4128e0 | 3582 | chan->dcid = dcid; |
c1360a1c | 3583 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3584 | |
c1360a1c | 3585 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3586 | break; |
3587 | ||
1da177e4 | 3588 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3589 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3590 | chan->num_conf_req++; |
1da177e4 LT |
3591 | break; |
3592 | ||
3593 | case L2CAP_CR_PEND: | |
c1360a1c | 3594 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3595 | break; |
3596 | ||
3597 | default: | |
48454079 | 3598 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3599 | break; |
3600 | } | |
3601 | ||
6be36555 | 3602 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3603 | |
3604 | unlock: | |
3605 | mutex_unlock(&conn->chan_lock); | |
3606 | ||
3607 | return err; | |
1da177e4 LT |
3608 | } |
3609 | ||
47d1ec61 | 3610 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3611 | { |
3612 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3613 | * sides request it. | |
3614 | */ | |
0c1bc5c6 | 3615 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3616 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3617 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3618 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3619 | } |
3620 | ||
29d8a590 AE |
3621 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3622 | u8 ident, u16 flags) | |
3623 | { | |
3624 | struct l2cap_conn *conn = chan->conn; | |
3625 | ||
3626 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3627 | flags); | |
3628 | ||
3629 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3630 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3631 | ||
3632 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3633 | l2cap_build_conf_rsp(chan, data, | |
3634 | L2CAP_CONF_SUCCESS, flags), data); | |
3635 | } | |
3636 | ||
2d792818 GP |
3637 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3638 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3639 | u8 *data) | |
1da177e4 LT |
3640 | { |
3641 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3642 | u16 dcid, flags; | |
3643 | u8 rsp[64]; | |
48454079 | 3644 | struct l2cap_chan *chan; |
3c588192 | 3645 | int len, err = 0; |
1da177e4 LT |
3646 | |
3647 | dcid = __le16_to_cpu(req->dcid); | |
3648 | flags = __le16_to_cpu(req->flags); | |
3649 | ||
3650 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3651 | ||
baa7e1fa | 3652 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3653 | if (!chan) |
1da177e4 LT |
3654 | return -ENOENT; |
3655 | ||
033b1142 | 3656 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3657 | struct l2cap_cmd_rej_cid rej; |
3658 | ||
ac73498c | 3659 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3660 | rej.scid = cpu_to_le16(chan->scid); |
3661 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3662 | |
df6bd743 | 3663 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2d792818 | 3664 | sizeof(rej), &rej); |
354f60a9 | 3665 | goto unlock; |
df6bd743 | 3666 | } |
354f60a9 | 3667 | |
5dee9e7c | 3668 | /* Reject if config buffer is too small. */ |
88219a0f | 3669 | len = cmd_len - sizeof(*req); |
7ac28817 | 3670 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3671 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
3672 | l2cap_build_conf_rsp(chan, rsp, |
3673 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
3674 | goto unlock; |
3675 | } | |
3676 | ||
3677 | /* Store config. */ | |
73ffa904 GP |
3678 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3679 | chan->conf_len += len; | |
1da177e4 | 3680 | |
59e54bd1 | 3681 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3682 | /* Incomplete config. Send empty response. */ |
3683 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
3684 | l2cap_build_conf_rsp(chan, rsp, |
3685 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
3686 | goto unlock; |
3687 | } | |
3688 | ||
3689 | /* Complete config. */ | |
73ffa904 | 3690 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3691 | if (len < 0) { |
e92c8e70 | 3692 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3693 | goto unlock; |
f2fcfcd6 | 3694 | } |
1da177e4 | 3695 | |
5dee9e7c | 3696 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3697 | chan->num_conf_rsp++; |
5dee9e7c | 3698 | |
5dee9e7c | 3699 | /* Reset config buffer. */ |
73ffa904 | 3700 | chan->conf_len = 0; |
5dee9e7c | 3701 | |
c1360a1c | 3702 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3703 | goto unlock; |
3704 | ||
c1360a1c | 3705 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3706 | set_default_fcs(chan); |
fcc203c3 | 3707 | |
105bdf9e MM |
3708 | if (chan->mode == L2CAP_MODE_ERTM || |
3709 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3710 | err = l2cap_ertm_init(chan); |
3711 | ||
3712 | if (err < 0) | |
3713 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3714 | else | |
3715 | l2cap_chan_ready(chan); | |
0565c1c2 | 3716 | |
876d9484 MH |
3717 | goto unlock; |
3718 | } | |
3719 | ||
c1360a1c | 3720 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3721 | u8 buf[64]; |
1da177e4 | 3722 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3723 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3724 | chan->num_conf_req++; |
1da177e4 LT |
3725 | } |
3726 | ||
0e8b207e AE |
3727 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3728 | Conf Rsp PENDING in the code above */ | |
3729 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 3730 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
3731 | |
3732 | /* check compatibility */ | |
3733 | ||
79de886d AE |
3734 | /* Send rsp for BR/EDR channel */ |
3735 | if (!chan->ctrl_id) | |
3736 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); | |
3737 | else | |
3738 | chan->ident = cmd->ident; | |
0e8b207e AE |
3739 | } |
3740 | ||
1da177e4 | 3741 | unlock: |
6be36555 | 3742 | l2cap_chan_unlock(chan); |
3c588192 | 3743 | return err; |
1da177e4 LT |
3744 | } |
3745 | ||
2d792818 GP |
3746 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
3747 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3748 | { |
3749 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3750 | u16 scid, flags, result; | |
48454079 | 3751 | struct l2cap_chan *chan; |
61386cba | 3752 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3753 | int err = 0; |
1da177e4 LT |
3754 | |
3755 | scid = __le16_to_cpu(rsp->scid); | |
3756 | flags = __le16_to_cpu(rsp->flags); | |
3757 | result = __le16_to_cpu(rsp->result); | |
3758 | ||
61386cba AE |
3759 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3760 | result, len); | |
1da177e4 | 3761 | |
baa7e1fa | 3762 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3763 | if (!chan) |
1da177e4 LT |
3764 | return 0; |
3765 | ||
3766 | switch (result) { | |
3767 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3768 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3769 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3770 | break; |
3771 | ||
0e8b207e AE |
3772 | case L2CAP_CONF_PENDING: |
3773 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3774 | ||
3775 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3776 | char buf[64]; | |
3777 | ||
3778 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 3779 | buf, &result); |
0e8b207e AE |
3780 | if (len < 0) { |
3781 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3782 | goto done; | |
3783 | } | |
3784 | ||
3785 | /* check compatibility */ | |
3786 | ||
79de886d AE |
3787 | if (!chan->ctrl_id) |
3788 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, | |
3789 | 0); | |
3790 | else | |
3791 | chan->ident = cmd->ident; | |
0e8b207e AE |
3792 | } |
3793 | goto done; | |
3794 | ||
1da177e4 | 3795 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3796 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3797 | char req[64]; |
3798 | ||
c2c77ec8 | 3799 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3800 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3801 | goto done; |
3802 | } | |
3803 | ||
f2fcfcd6 GP |
3804 | /* throw out any old stored conf requests */ |
3805 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 3806 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 3807 | req, &result); |
f2fcfcd6 | 3808 | if (len < 0) { |
e92c8e70 | 3809 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3810 | goto done; |
3811 | } | |
3812 | ||
3813 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 3814 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 3815 | chan->num_conf_req++; |
f2fcfcd6 GP |
3816 | if (result != L2CAP_CONF_SUCCESS) |
3817 | goto done; | |
3818 | break; | |
1da177e4 LT |
3819 | } |
3820 | ||
8e87d142 | 3821 | default: |
6be36555 | 3822 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3823 | |
ba13ccd9 | 3824 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3825 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3826 | goto done; |
3827 | } | |
3828 | ||
59e54bd1 | 3829 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3830 | goto done; |
3831 | ||
c1360a1c | 3832 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3833 | |
c1360a1c | 3834 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3835 | set_default_fcs(chan); |
fcc203c3 | 3836 | |
105bdf9e MM |
3837 | if (chan->mode == L2CAP_MODE_ERTM || |
3838 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3839 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3840 | |
3c588192 MM |
3841 | if (err < 0) |
3842 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3843 | else | |
3844 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3845 | } |
3846 | ||
3847 | done: | |
6be36555 | 3848 | l2cap_chan_unlock(chan); |
3c588192 | 3849 | return err; |
1da177e4 LT |
3850 | } |
3851 | ||
2d792818 GP |
3852 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
3853 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3854 | { |
3855 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3856 | struct l2cap_disconn_rsp rsp; | |
3857 | u16 dcid, scid; | |
48454079 | 3858 | struct l2cap_chan *chan; |
1da177e4 LT |
3859 | struct sock *sk; |
3860 | ||
3861 | scid = __le16_to_cpu(req->scid); | |
3862 | dcid = __le16_to_cpu(req->dcid); | |
3863 | ||
3864 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3865 | ||
3df91ea2 AE |
3866 | mutex_lock(&conn->chan_lock); |
3867 | ||
3868 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3869 | if (!chan) { | |
3870 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3871 | return 0; |
3df91ea2 | 3872 | } |
1da177e4 | 3873 | |
6be36555 AE |
3874 | l2cap_chan_lock(chan); |
3875 | ||
48454079 GP |
3876 | sk = chan->sk; |
3877 | ||
fe4128e0 GP |
3878 | rsp.dcid = cpu_to_le16(chan->scid); |
3879 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3880 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3881 | ||
6be36555 | 3882 | lock_sock(sk); |
1da177e4 | 3883 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3884 | release_sock(sk); |
1da177e4 | 3885 | |
61d6ef3e | 3886 | l2cap_chan_hold(chan); |
48454079 | 3887 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3888 | |
3889 | l2cap_chan_unlock(chan); | |
1da177e4 | 3890 | |
80b98027 | 3891 | chan->ops->close(chan); |
61d6ef3e | 3892 | l2cap_chan_put(chan); |
3df91ea2 AE |
3893 | |
3894 | mutex_unlock(&conn->chan_lock); | |
3895 | ||
1da177e4 LT |
3896 | return 0; |
3897 | } | |
3898 | ||
2d792818 GP |
3899 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
3900 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3901 | { |
3902 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3903 | u16 dcid, scid; | |
48454079 | 3904 | struct l2cap_chan *chan; |
1da177e4 LT |
3905 | |
3906 | scid = __le16_to_cpu(rsp->scid); | |
3907 | dcid = __le16_to_cpu(rsp->dcid); | |
3908 | ||
3909 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3910 | ||
3df91ea2 AE |
3911 | mutex_lock(&conn->chan_lock); |
3912 | ||
3913 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3914 | if (!chan) { | |
3915 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3916 | return 0; |
3df91ea2 | 3917 | } |
1da177e4 | 3918 | |
6be36555 | 3919 | l2cap_chan_lock(chan); |
48454079 | 3920 | |
61d6ef3e | 3921 | l2cap_chan_hold(chan); |
48454079 | 3922 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3923 | |
3924 | l2cap_chan_unlock(chan); | |
1da177e4 | 3925 | |
80b98027 | 3926 | chan->ops->close(chan); |
61d6ef3e | 3927 | l2cap_chan_put(chan); |
3df91ea2 AE |
3928 | |
3929 | mutex_unlock(&conn->chan_lock); | |
3930 | ||
1da177e4 LT |
3931 | return 0; |
3932 | } | |
3933 | ||
2d792818 GP |
3934 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
3935 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3936 | { |
3937 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3938 | u16 type; |
3939 | ||
3940 | type = __le16_to_cpu(req->type); | |
3941 | ||
3942 | BT_DBG("type 0x%4.4x", type); | |
3943 | ||
f0709e03 MH |
3944 | if (type == L2CAP_IT_FEAT_MASK) { |
3945 | u8 buf[8]; | |
44dd46de | 3946 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3947 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3948 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3949 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3950 | if (!disable_ertm) |
fcc203c3 | 3951 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 3952 | | L2CAP_FEAT_FCS; |
a5fd6f30 | 3953 | if (enable_hs) |
6327eb98 | 3954 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 3955 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 3956 | |
1b7bf4ed | 3957 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
3958 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3959 | buf); | |
e1027a7c MH |
3960 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3961 | u8 buf[12]; | |
3962 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3963 | |
3964 | if (enable_hs) | |
3965 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3966 | else | |
3967 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3968 | ||
ac73498c AE |
3969 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3970 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3971 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
3972 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
3973 | buf); | |
f0709e03 MH |
3974 | } else { |
3975 | struct l2cap_info_rsp rsp; | |
3976 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3977 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
3978 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
3979 | &rsp); | |
f0709e03 | 3980 | } |
1da177e4 LT |
3981 | |
3982 | return 0; | |
3983 | } | |
3984 | ||
2d792818 GP |
3985 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
3986 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3987 | { |
3988 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3989 | u16 type, result; | |
3990 | ||
3991 | type = __le16_to_cpu(rsp->type); | |
3992 | result = __le16_to_cpu(rsp->result); | |
3993 | ||
3994 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3995 | ||
e90165be AE |
3996 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3997 | if (cmd->ident != conn->info_ident || | |
2d792818 | 3998 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
3999 | return 0; |
4000 | ||
17cd3f37 | 4001 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4002 | |
adb08ede VT |
4003 | if (result != L2CAP_IR_SUCCESS) { |
4004 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4005 | conn->info_ident = 0; | |
4006 | ||
4007 | l2cap_conn_start(conn); | |
4008 | ||
4009 | return 0; | |
4010 | } | |
4011 | ||
978c93b9 AE |
4012 | switch (type) { |
4013 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4014 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4015 | |
47ec1dcd | 4016 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4017 | struct l2cap_info_req req; |
ac73498c | 4018 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4019 | |
4020 | conn->info_ident = l2cap_get_ident(conn); | |
4021 | ||
4022 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4023 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4024 | } else { |
4025 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4026 | conn->info_ident = 0; | |
4027 | ||
4028 | l2cap_conn_start(conn); | |
4029 | } | |
978c93b9 AE |
4030 | break; |
4031 | ||
4032 | case L2CAP_IT_FIXED_CHAN: | |
4033 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4034 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4035 | conn->info_ident = 0; |
984947dc MH |
4036 | |
4037 | l2cap_conn_start(conn); | |
978c93b9 | 4038 | break; |
984947dc | 4039 | } |
4e8402a3 | 4040 | |
1da177e4 LT |
4041 | return 0; |
4042 | } | |
4043 | ||
1700915f MM |
4044 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4045 | struct l2cap_cmd_hdr *cmd, | |
4046 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4047 | { |
4048 | struct l2cap_create_chan_req *req = data; | |
1700915f | 4049 | struct l2cap_chan *chan; |
f94ff6ff MM |
4050 | u16 psm, scid; |
4051 | ||
4052 | if (cmd_len != sizeof(*req)) | |
4053 | return -EPROTO; | |
4054 | ||
4055 | if (!enable_hs) | |
4056 | return -EINVAL; | |
4057 | ||
4058 | psm = le16_to_cpu(req->psm); | |
4059 | scid = le16_to_cpu(req->scid); | |
4060 | ||
ad0ac6ca | 4061 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4062 | |
1700915f MM |
4063 | if (req->amp_id) { |
4064 | struct hci_dev *hdev; | |
4065 | ||
4066 | /* Validate AMP controller id */ | |
4067 | hdev = hci_dev_get(req->amp_id); | |
4068 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4069 | !test_bit(HCI_UP, &hdev->flags)) { | |
4070 | struct l2cap_create_chan_rsp rsp; | |
4071 | ||
4072 | rsp.dcid = 0; | |
4073 | rsp.scid = cpu_to_le16(scid); | |
4074 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4075 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4076 | ||
4077 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4078 | sizeof(rsp), &rsp); | |
4079 | ||
4080 | if (hdev) | |
4081 | hci_dev_put(hdev); | |
4082 | ||
4083 | return 0; | |
4084 | } | |
4085 | ||
4086 | hci_dev_put(hdev); | |
4087 | } | |
f94ff6ff | 4088 | |
1700915f MM |
4089 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4090 | req->amp_id); | |
f94ff6ff MM |
4091 | |
4092 | return 0; | |
4093 | } | |
4094 | ||
8d5a04a1 | 4095 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 4096 | u16 icid, u16 result) |
8d5a04a1 MM |
4097 | { |
4098 | struct l2cap_move_chan_rsp rsp; | |
4099 | ||
ad0ac6ca | 4100 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4101 | |
4102 | rsp.icid = cpu_to_le16(icid); | |
4103 | rsp.result = cpu_to_le16(result); | |
4104 | ||
4105 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
4106 | } | |
4107 | ||
4108 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4109 | struct l2cap_chan *chan, |
4110 | u16 icid, u16 result) | |
8d5a04a1 MM |
4111 | { |
4112 | struct l2cap_move_chan_cfm cfm; | |
4113 | u8 ident; | |
4114 | ||
ad0ac6ca | 4115 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4116 | |
4117 | ident = l2cap_get_ident(conn); | |
4118 | if (chan) | |
4119 | chan->ident = ident; | |
4120 | ||
4121 | cfm.icid = cpu_to_le16(icid); | |
4122 | cfm.result = cpu_to_le16(result); | |
4123 | ||
4124 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4125 | } | |
4126 | ||
4127 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4128 | u16 icid) |
8d5a04a1 MM |
4129 | { |
4130 | struct l2cap_move_chan_cfm_rsp rsp; | |
4131 | ||
ad0ac6ca | 4132 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4133 | |
4134 | rsp.icid = cpu_to_le16(icid); | |
4135 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4136 | } | |
4137 | ||
4138 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4139 | struct l2cap_cmd_hdr *cmd, |
4140 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4141 | { |
4142 | struct l2cap_move_chan_req *req = data; | |
4143 | u16 icid = 0; | |
4144 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4145 | ||
4146 | if (cmd_len != sizeof(*req)) | |
4147 | return -EPROTO; | |
4148 | ||
4149 | icid = le16_to_cpu(req->icid); | |
4150 | ||
ad0ac6ca | 4151 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4152 | |
4153 | if (!enable_hs) | |
4154 | return -EINVAL; | |
4155 | ||
4156 | /* Placeholder: Always refuse */ | |
4157 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4158 | ||
4159 | return 0; | |
4160 | } | |
4161 | ||
4162 | static inline int l2cap_move_channel_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_rsp *rsp = data; | |
4167 | u16 icid, result; | |
4168 | ||
4169 | if (cmd_len != sizeof(*rsp)) | |
4170 | return -EPROTO; | |
4171 | ||
4172 | icid = le16_to_cpu(rsp->icid); | |
4173 | result = le16_to_cpu(rsp->result); | |
4174 | ||
ad0ac6ca | 4175 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4176 | |
4177 | /* Placeholder: Always unconfirmed */ | |
4178 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4179 | ||
4180 | return 0; | |
4181 | } | |
4182 | ||
4183 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4184 | struct l2cap_cmd_hdr *cmd, |
4185 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4186 | { |
4187 | struct l2cap_move_chan_cfm *cfm = data; | |
4188 | u16 icid, result; | |
4189 | ||
4190 | if (cmd_len != sizeof(*cfm)) | |
4191 | return -EPROTO; | |
4192 | ||
4193 | icid = le16_to_cpu(cfm->icid); | |
4194 | result = le16_to_cpu(cfm->result); | |
4195 | ||
ad0ac6ca | 4196 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4197 | |
4198 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4199 | ||
4200 | return 0; | |
4201 | } | |
4202 | ||
4203 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4204 | struct l2cap_cmd_hdr *cmd, |
4205 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4206 | { |
4207 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4208 | u16 icid; | |
4209 | ||
4210 | if (cmd_len != sizeof(*rsp)) | |
4211 | return -EPROTO; | |
4212 | ||
4213 | icid = le16_to_cpu(rsp->icid); | |
4214 | ||
ad0ac6ca | 4215 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4216 | |
4217 | return 0; | |
4218 | } | |
4219 | ||
e2174ca4 | 4220 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 4221 | u16 to_multiplier) |
de73115a CT |
4222 | { |
4223 | u16 max_latency; | |
4224 | ||
4225 | if (min > max || min < 6 || max > 3200) | |
4226 | return -EINVAL; | |
4227 | ||
4228 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4229 | return -EINVAL; | |
4230 | ||
4231 | if (max >= to_multiplier * 8) | |
4232 | return -EINVAL; | |
4233 | ||
4234 | max_latency = (to_multiplier * 8 / max) - 1; | |
4235 | if (latency > 499 || latency > max_latency) | |
4236 | return -EINVAL; | |
4237 | ||
4238 | return 0; | |
4239 | } | |
4240 | ||
4241 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
4242 | struct l2cap_cmd_hdr *cmd, |
4243 | u8 *data) | |
de73115a CT |
4244 | { |
4245 | struct hci_conn *hcon = conn->hcon; | |
4246 | struct l2cap_conn_param_update_req *req; | |
4247 | struct l2cap_conn_param_update_rsp rsp; | |
4248 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4249 | int err; |
de73115a CT |
4250 | |
4251 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4252 | return -EINVAL; | |
4253 | ||
4254 | cmd_len = __le16_to_cpu(cmd->len); | |
4255 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4256 | return -EPROTO; | |
4257 | ||
4258 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4259 | min = __le16_to_cpu(req->min); |
4260 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4261 | latency = __le16_to_cpu(req->latency); |
4262 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4263 | ||
4264 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 4265 | min, max, latency, to_multiplier); |
de73115a CT |
4266 | |
4267 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4268 | |
4269 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4270 | if (err) | |
ac73498c | 4271 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4272 | else |
ac73498c | 4273 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4274 | |
4275 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 4276 | sizeof(rsp), &rsp); |
de73115a | 4277 | |
2ce603eb CT |
4278 | if (!err) |
4279 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4280 | ||
de73115a CT |
4281 | return 0; |
4282 | } | |
4283 | ||
3300d9a9 | 4284 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
4285 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4286 | u8 *data) | |
3300d9a9 CT |
4287 | { |
4288 | int err = 0; | |
4289 | ||
4290 | switch (cmd->code) { | |
4291 | case L2CAP_COMMAND_REJ: | |
4292 | l2cap_command_rej(conn, cmd, data); | |
4293 | break; | |
4294 | ||
4295 | case L2CAP_CONN_REQ: | |
4296 | err = l2cap_connect_req(conn, cmd, data); | |
4297 | break; | |
4298 | ||
4299 | case L2CAP_CONN_RSP: | |
f5a2598d | 4300 | case L2CAP_CREATE_CHAN_RSP: |
5909cf30 | 4301 | err = l2cap_connect_create_rsp(conn, cmd, data); |
3300d9a9 CT |
4302 | break; |
4303 | ||
4304 | case L2CAP_CONF_REQ: | |
4305 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4306 | break; | |
4307 | ||
4308 | case L2CAP_CONF_RSP: | |
4309 | err = l2cap_config_rsp(conn, cmd, data); | |
4310 | break; | |
4311 | ||
4312 | case L2CAP_DISCONN_REQ: | |
4313 | err = l2cap_disconnect_req(conn, cmd, data); | |
4314 | break; | |
4315 | ||
4316 | case L2CAP_DISCONN_RSP: | |
4317 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4318 | break; | |
4319 | ||
4320 | case L2CAP_ECHO_REQ: | |
4321 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4322 | break; | |
4323 | ||
4324 | case L2CAP_ECHO_RSP: | |
4325 | break; | |
4326 | ||
4327 | case L2CAP_INFO_REQ: | |
4328 | err = l2cap_information_req(conn, cmd, data); | |
4329 | break; | |
4330 | ||
4331 | case L2CAP_INFO_RSP: | |
4332 | err = l2cap_information_rsp(conn, cmd, data); | |
4333 | break; | |
4334 | ||
f94ff6ff MM |
4335 | case L2CAP_CREATE_CHAN_REQ: |
4336 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4337 | break; | |
4338 | ||
8d5a04a1 MM |
4339 | case L2CAP_MOVE_CHAN_REQ: |
4340 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4341 | break; | |
4342 | ||
4343 | case L2CAP_MOVE_CHAN_RSP: | |
4344 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4345 | break; | |
4346 | ||
4347 | case L2CAP_MOVE_CHAN_CFM: | |
4348 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4349 | break; | |
4350 | ||
4351 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4352 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4353 | break; | |
4354 | ||
3300d9a9 CT |
4355 | default: |
4356 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4357 | err = -EINVAL; | |
4358 | break; | |
4359 | } | |
4360 | ||
4361 | return err; | |
4362 | } | |
4363 | ||
4364 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 4365 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
4366 | { |
4367 | switch (cmd->code) { | |
4368 | case L2CAP_COMMAND_REJ: | |
4369 | return 0; | |
4370 | ||
4371 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4372 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4373 | |
4374 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4375 | return 0; | |
4376 | ||
4377 | default: | |
4378 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4379 | return -EINVAL; | |
4380 | } | |
4381 | } | |
4382 | ||
4383 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2d792818 | 4384 | struct sk_buff *skb) |
1da177e4 LT |
4385 | { |
4386 | u8 *data = skb->data; | |
4387 | int len = skb->len; | |
4388 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4389 | int err; |
1da177e4 LT |
4390 | |
4391 | l2cap_raw_recv(conn, skb); | |
4392 | ||
4393 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4394 | u16 cmd_len; |
1da177e4 LT |
4395 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4396 | data += L2CAP_CMD_HDR_SIZE; | |
4397 | len -= L2CAP_CMD_HDR_SIZE; | |
4398 | ||
88219a0f | 4399 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4400 | |
2d792818 GP |
4401 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
4402 | cmd.ident); | |
1da177e4 | 4403 | |
88219a0f | 4404 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4405 | BT_DBG("corrupted command"); |
4406 | break; | |
4407 | } | |
4408 | ||
3300d9a9 CT |
4409 | if (conn->hcon->type == LE_LINK) |
4410 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4411 | else | |
4412 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4413 | |
4414 | if (err) { | |
e2fd318e | 4415 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4416 | |
4417 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4418 | |
4419 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4420 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
4421 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
4422 | sizeof(rej), &rej); | |
1da177e4 LT |
4423 | } |
4424 | ||
88219a0f AV |
4425 | data += cmd_len; |
4426 | len -= cmd_len; | |
1da177e4 LT |
4427 | } |
4428 | ||
4429 | kfree_skb(skb); | |
4430 | } | |
4431 | ||
47d1ec61 | 4432 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4433 | { |
4434 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4435 | int hdr_size; |
4436 | ||
4437 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4438 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4439 | else | |
4440 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4441 | |
47d1ec61 | 4442 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4443 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4444 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4445 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4446 | ||
4447 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4448 | return -EBADMSG; |
fcc203c3 GP |
4449 | } |
4450 | return 0; | |
4451 | } | |
4452 | ||
6ea00485 | 4453 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4454 | { |
e31f7633 | 4455 | struct l2cap_ctrl control; |
d5392c8f | 4456 | |
e31f7633 | 4457 | BT_DBG("chan %p", chan); |
d5392c8f | 4458 | |
e31f7633 MM |
4459 | memset(&control, 0, sizeof(control)); |
4460 | control.sframe = 1; | |
4461 | control.final = 1; | |
4462 | control.reqseq = chan->buffer_seq; | |
4463 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4464 | |
e2ab4353 | 4465 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4466 | control.super = L2CAP_SUPER_RNR; |
4467 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4468 | } |
4469 | ||
e31f7633 MM |
4470 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4471 | chan->unacked_frames > 0) | |
4472 | __set_retrans_timer(chan); | |
d5392c8f | 4473 | |
e31f7633 | 4474 | /* Send pending iframes */ |
525cd185 | 4475 | l2cap_ertm_send(chan); |
d5392c8f | 4476 | |
e2ab4353 | 4477 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4478 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4479 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4480 | * send it now. | |
4481 | */ | |
4482 | control.super = L2CAP_SUPER_RR; | |
4483 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4484 | } |
4485 | } | |
4486 | ||
2d792818 GP |
4487 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
4488 | struct sk_buff **last_frag) | |
18778a63 | 4489 | { |
84084a31 MM |
4490 | /* skb->len reflects data in skb as well as all fragments |
4491 | * skb->data_len reflects only data in fragments | |
4492 | */ | |
4493 | if (!skb_has_frag_list(skb)) | |
4494 | skb_shinfo(skb)->frag_list = new_frag; | |
4495 | ||
4496 | new_frag->next = NULL; | |
4497 | ||
4498 | (*last_frag)->next = new_frag; | |
4499 | *last_frag = new_frag; | |
4500 | ||
4501 | skb->len += new_frag->len; | |
4502 | skb->data_len += new_frag->len; | |
4503 | skb->truesize += new_frag->truesize; | |
4504 | } | |
4505 | ||
4b51dae9 MM |
4506 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4507 | struct l2cap_ctrl *control) | |
84084a31 MM |
4508 | { |
4509 | int err = -EINVAL; | |
18778a63 | 4510 | |
4b51dae9 | 4511 | switch (control->sar) { |
7e0ef6ee | 4512 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4513 | if (chan->sdu) |
4514 | break; | |
18778a63 | 4515 | |
80b98027 | 4516 | err = chan->ops->recv(chan, skb); |
84084a31 | 4517 | break; |
18778a63 | 4518 | |
7e0ef6ee | 4519 | case L2CAP_SAR_START: |
84084a31 MM |
4520 | if (chan->sdu) |
4521 | break; | |
18778a63 | 4522 | |
6f61fd47 | 4523 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4524 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4525 | |
84084a31 MM |
4526 | if (chan->sdu_len > chan->imtu) { |
4527 | err = -EMSGSIZE; | |
4528 | break; | |
4529 | } | |
1890d36b | 4530 | |
84084a31 MM |
4531 | if (skb->len >= chan->sdu_len) |
4532 | break; | |
18778a63 | 4533 | |
84084a31 MM |
4534 | chan->sdu = skb; |
4535 | chan->sdu_last_frag = skb; | |
18778a63 | 4536 | |
84084a31 MM |
4537 | skb = NULL; |
4538 | err = 0; | |
18778a63 GP |
4539 | break; |
4540 | ||
7e0ef6ee | 4541 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4542 | if (!chan->sdu) |
84084a31 | 4543 | break; |
18778a63 | 4544 | |
84084a31 MM |
4545 | append_skb_frag(chan->sdu, skb, |
4546 | &chan->sdu_last_frag); | |
4547 | skb = NULL; | |
18778a63 | 4548 | |
84084a31 MM |
4549 | if (chan->sdu->len >= chan->sdu_len) |
4550 | break; | |
4178ba46 | 4551 | |
84084a31 | 4552 | err = 0; |
18778a63 GP |
4553 | break; |
4554 | ||
7e0ef6ee | 4555 | case L2CAP_SAR_END: |
6f61fd47 | 4556 | if (!chan->sdu) |
84084a31 | 4557 | break; |
18778a63 | 4558 | |
84084a31 MM |
4559 | append_skb_frag(chan->sdu, skb, |
4560 | &chan->sdu_last_frag); | |
4561 | skb = NULL; | |
4178ba46 | 4562 | |
84084a31 MM |
4563 | if (chan->sdu->len != chan->sdu_len) |
4564 | break; | |
18778a63 | 4565 | |
80b98027 | 4566 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4567 | |
84084a31 MM |
4568 | if (!err) { |
4569 | /* Reassembly complete */ | |
4570 | chan->sdu = NULL; | |
4571 | chan->sdu_last_frag = NULL; | |
4572 | chan->sdu_len = 0; | |
1890d36b | 4573 | } |
18778a63 GP |
4574 | break; |
4575 | } | |
4576 | ||
84084a31 MM |
4577 | if (err) { |
4578 | kfree_skb(skb); | |
4579 | kfree_skb(chan->sdu); | |
4580 | chan->sdu = NULL; | |
4581 | chan->sdu_last_frag = NULL; | |
4582 | chan->sdu_len = 0; | |
4583 | } | |
18778a63 | 4584 | |
84084a31 | 4585 | return err; |
18778a63 GP |
4586 | } |
4587 | ||
61aa4f5b | 4588 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4589 | { |
61aa4f5b | 4590 | u8 event; |
712132eb | 4591 | |
61aa4f5b MM |
4592 | if (chan->mode != L2CAP_MODE_ERTM) |
4593 | return; | |
712132eb | 4594 | |
61aa4f5b | 4595 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4596 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4597 | } |
4598 | ||
d2a7ac5d MM |
4599 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4600 | { | |
63838725 MM |
4601 | int err = 0; |
4602 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4603 | * until a gap is encountered. | |
4604 | */ | |
4605 | ||
4606 | BT_DBG("chan %p", chan); | |
4607 | ||
4608 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4609 | struct sk_buff *skb; | |
4610 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4611 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4612 | ||
4613 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4614 | ||
4615 | if (!skb) | |
4616 | break; | |
4617 | ||
4618 | skb_unlink(skb, &chan->srej_q); | |
4619 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4620 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4621 | if (err) | |
4622 | break; | |
4623 | } | |
4624 | ||
4625 | if (skb_queue_empty(&chan->srej_q)) { | |
4626 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4627 | l2cap_send_ack(chan); | |
4628 | } | |
4629 | ||
4630 | return err; | |
d2a7ac5d MM |
4631 | } |
4632 | ||
4633 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4634 | struct l2cap_ctrl *control) | |
4635 | { | |
f80842a8 MM |
4636 | struct sk_buff *skb; |
4637 | ||
4638 | BT_DBG("chan %p, control %p", chan, control); | |
4639 | ||
4640 | if (control->reqseq == chan->next_tx_seq) { | |
4641 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4642 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4643 | return; | |
4644 | } | |
4645 | ||
4646 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4647 | ||
4648 | if (skb == NULL) { | |
4649 | BT_DBG("Seq %d not available for retransmission", | |
4650 | control->reqseq); | |
4651 | return; | |
4652 | } | |
4653 | ||
4654 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4655 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4656 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4657 | return; | |
4658 | } | |
4659 | ||
4660 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4661 | ||
4662 | if (control->poll) { | |
4663 | l2cap_pass_to_tx(chan, control); | |
4664 | ||
4665 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4666 | l2cap_retransmit(chan, control); | |
4667 | l2cap_ertm_send(chan); | |
4668 | ||
4669 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4670 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4671 | chan->srej_save_reqseq = control->reqseq; | |
4672 | } | |
4673 | } else { | |
4674 | l2cap_pass_to_tx_fbit(chan, control); | |
4675 | ||
4676 | if (control->final) { | |
4677 | if (chan->srej_save_reqseq != control->reqseq || | |
4678 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4679 | &chan->conn_state)) | |
4680 | l2cap_retransmit(chan, control); | |
4681 | } else { | |
4682 | l2cap_retransmit(chan, control); | |
4683 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4684 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4685 | chan->srej_save_reqseq = control->reqseq; | |
4686 | } | |
4687 | } | |
4688 | } | |
d2a7ac5d MM |
4689 | } |
4690 | ||
4691 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4692 | struct l2cap_ctrl *control) | |
4693 | { | |
fcd289df MM |
4694 | struct sk_buff *skb; |
4695 | ||
4696 | BT_DBG("chan %p, control %p", chan, control); | |
4697 | ||
4698 | if (control->reqseq == chan->next_tx_seq) { | |
4699 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4700 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4701 | return; | |
4702 | } | |
4703 | ||
4704 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4705 | ||
4706 | if (chan->max_tx && skb && | |
4707 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4708 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4709 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4710 | return; | |
4711 | } | |
4712 | ||
4713 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4714 | ||
4715 | l2cap_pass_to_tx(chan, control); | |
4716 | ||
4717 | if (control->final) { | |
4718 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4719 | l2cap_retransmit_all(chan, control); | |
4720 | } else { | |
4721 | l2cap_retransmit_all(chan, control); | |
4722 | l2cap_ertm_send(chan); | |
4723 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4724 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4725 | } | |
d2a7ac5d MM |
4726 | } |
4727 | ||
4b51dae9 MM |
4728 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4729 | { | |
4730 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4731 | ||
4732 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4733 | chan->expected_tx_seq); | |
4734 | ||
4735 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4736 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 4737 | chan->tx_win) { |
4b51dae9 MM |
4738 | /* See notes below regarding "double poll" and |
4739 | * invalid packets. | |
4740 | */ | |
4741 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4742 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4743 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4744 | } else { | |
4745 | BT_DBG("Invalid - in window after SREJ sent"); | |
4746 | return L2CAP_TXSEQ_INVALID; | |
4747 | } | |
4748 | } | |
4749 | ||
4750 | if (chan->srej_list.head == txseq) { | |
4751 | BT_DBG("Expected SREJ"); | |
4752 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4753 | } | |
4754 | ||
4755 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4756 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4757 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4758 | } | |
4759 | ||
4760 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4761 | BT_DBG("Unexpected SREJ - not requested"); | |
4762 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4763 | } | |
4764 | } | |
4765 | ||
4766 | if (chan->expected_tx_seq == txseq) { | |
4767 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4768 | chan->tx_win) { | |
4769 | BT_DBG("Invalid - txseq outside tx window"); | |
4770 | return L2CAP_TXSEQ_INVALID; | |
4771 | } else { | |
4772 | BT_DBG("Expected"); | |
4773 | return L2CAP_TXSEQ_EXPECTED; | |
4774 | } | |
4775 | } | |
4776 | ||
4777 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 4778 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
4779 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
4780 | return L2CAP_TXSEQ_DUPLICATE; | |
4781 | } | |
4782 | ||
4783 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4784 | /* A source of invalid packets is a "double poll" condition, | |
4785 | * where delays cause us to send multiple poll packets. If | |
4786 | * the remote stack receives and processes both polls, | |
4787 | * sequence numbers can wrap around in such a way that a | |
4788 | * resent frame has a sequence number that looks like new data | |
4789 | * with a sequence gap. This would trigger an erroneous SREJ | |
4790 | * request. | |
4791 | * | |
4792 | * Fortunately, this is impossible with a tx window that's | |
4793 | * less than half of the maximum sequence number, which allows | |
4794 | * invalid frames to be safely ignored. | |
4795 | * | |
4796 | * With tx window sizes greater than half of the tx window | |
4797 | * maximum, the frame is invalid and cannot be ignored. This | |
4798 | * causes a disconnect. | |
4799 | */ | |
4800 | ||
4801 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4802 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4803 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4804 | } else { | |
4805 | BT_DBG("Invalid - txseq outside tx window"); | |
4806 | return L2CAP_TXSEQ_INVALID; | |
4807 | } | |
4808 | } else { | |
4809 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4810 | return L2CAP_TXSEQ_UNEXPECTED; | |
4811 | } | |
4812 | } | |
4813 | ||
d2a7ac5d MM |
4814 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4815 | struct l2cap_ctrl *control, | |
4816 | struct sk_buff *skb, u8 event) | |
4817 | { | |
4818 | int err = 0; | |
4819 | bool skb_in_use = 0; | |
4820 | ||
4821 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4822 | event); | |
4823 | ||
4824 | switch (event) { | |
4825 | case L2CAP_EV_RECV_IFRAME: | |
4826 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4827 | case L2CAP_TXSEQ_EXPECTED: | |
4828 | l2cap_pass_to_tx(chan, control); | |
4829 | ||
4830 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4831 | BT_DBG("Busy, discarding expected seq %d", | |
4832 | control->txseq); | |
4833 | break; | |
4834 | } | |
4835 | ||
4836 | chan->expected_tx_seq = __next_seq(chan, | |
4837 | control->txseq); | |
4838 | ||
4839 | chan->buffer_seq = chan->expected_tx_seq; | |
4840 | skb_in_use = 1; | |
4841 | ||
4842 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4843 | if (err) | |
4844 | break; | |
4845 | ||
4846 | if (control->final) { | |
4847 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4848 | &chan->conn_state)) { | |
4849 | control->final = 0; | |
4850 | l2cap_retransmit_all(chan, control); | |
4851 | l2cap_ertm_send(chan); | |
4852 | } | |
4853 | } | |
4854 | ||
4855 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4856 | l2cap_send_ack(chan); | |
4857 | break; | |
4858 | case L2CAP_TXSEQ_UNEXPECTED: | |
4859 | l2cap_pass_to_tx(chan, control); | |
4860 | ||
4861 | /* Can't issue SREJ frames in the local busy state. | |
4862 | * Drop this frame, it will be seen as missing | |
4863 | * when local busy is exited. | |
4864 | */ | |
4865 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4866 | BT_DBG("Busy, discarding unexpected seq %d", | |
4867 | control->txseq); | |
4868 | break; | |
4869 | } | |
4870 | ||
4871 | /* There was a gap in the sequence, so an SREJ | |
4872 | * must be sent for each missing frame. The | |
4873 | * current frame is stored for later use. | |
4874 | */ | |
4875 | skb_queue_tail(&chan->srej_q, skb); | |
4876 | skb_in_use = 1; | |
4877 | BT_DBG("Queued %p (queue len %d)", skb, | |
4878 | skb_queue_len(&chan->srej_q)); | |
4879 | ||
4880 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4881 | l2cap_seq_list_clear(&chan->srej_list); | |
4882 | l2cap_send_srej(chan, control->txseq); | |
4883 | ||
4884 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4885 | break; | |
4886 | case L2CAP_TXSEQ_DUPLICATE: | |
4887 | l2cap_pass_to_tx(chan, control); | |
4888 | break; | |
4889 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4890 | break; | |
4891 | case L2CAP_TXSEQ_INVALID: | |
4892 | default: | |
4893 | l2cap_send_disconn_req(chan->conn, chan, | |
4894 | ECONNRESET); | |
4895 | break; | |
4896 | } | |
4897 | break; | |
4898 | case L2CAP_EV_RECV_RR: | |
4899 | l2cap_pass_to_tx(chan, control); | |
4900 | if (control->final) { | |
4901 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4902 | ||
4903 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4904 | &chan->conn_state)) { | |
4905 | control->final = 0; | |
4906 | l2cap_retransmit_all(chan, control); | |
4907 | } | |
4908 | ||
4909 | l2cap_ertm_send(chan); | |
4910 | } else if (control->poll) { | |
4911 | l2cap_send_i_or_rr_or_rnr(chan); | |
4912 | } else { | |
4913 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4914 | &chan->conn_state) && | |
4915 | chan->unacked_frames) | |
4916 | __set_retrans_timer(chan); | |
4917 | ||
4918 | l2cap_ertm_send(chan); | |
4919 | } | |
4920 | break; | |
4921 | case L2CAP_EV_RECV_RNR: | |
4922 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4923 | l2cap_pass_to_tx(chan, control); | |
4924 | if (control && control->poll) { | |
4925 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4926 | l2cap_send_rr_or_rnr(chan, 0); | |
4927 | } | |
4928 | __clear_retrans_timer(chan); | |
4929 | l2cap_seq_list_clear(&chan->retrans_list); | |
4930 | break; | |
4931 | case L2CAP_EV_RECV_REJ: | |
4932 | l2cap_handle_rej(chan, control); | |
4933 | break; | |
4934 | case L2CAP_EV_RECV_SREJ: | |
4935 | l2cap_handle_srej(chan, control); | |
4936 | break; | |
4937 | default: | |
4938 | break; | |
4939 | } | |
4940 | ||
4941 | if (skb && !skb_in_use) { | |
4942 | BT_DBG("Freeing %p", skb); | |
4943 | kfree_skb(skb); | |
4944 | } | |
4945 | ||
4946 | return err; | |
4947 | } | |
4948 | ||
4949 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4950 | struct l2cap_ctrl *control, | |
4951 | struct sk_buff *skb, u8 event) | |
4952 | { | |
4953 | int err = 0; | |
4954 | u16 txseq = control->txseq; | |
4955 | bool skb_in_use = 0; | |
4956 | ||
4957 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4958 | event); | |
4959 | ||
4960 | switch (event) { | |
4961 | case L2CAP_EV_RECV_IFRAME: | |
4962 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4963 | case L2CAP_TXSEQ_EXPECTED: | |
4964 | /* Keep frame for reassembly later */ | |
4965 | l2cap_pass_to_tx(chan, control); | |
4966 | skb_queue_tail(&chan->srej_q, skb); | |
4967 | skb_in_use = 1; | |
4968 | BT_DBG("Queued %p (queue len %d)", skb, | |
4969 | skb_queue_len(&chan->srej_q)); | |
4970 | ||
4971 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4972 | break; | |
4973 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4974 | l2cap_seq_list_pop(&chan->srej_list); | |
4975 | ||
4976 | l2cap_pass_to_tx(chan, control); | |
4977 | skb_queue_tail(&chan->srej_q, skb); | |
4978 | skb_in_use = 1; | |
4979 | BT_DBG("Queued %p (queue len %d)", skb, | |
4980 | skb_queue_len(&chan->srej_q)); | |
4981 | ||
4982 | err = l2cap_rx_queued_iframes(chan); | |
4983 | if (err) | |
4984 | break; | |
4985 | ||
4986 | break; | |
4987 | case L2CAP_TXSEQ_UNEXPECTED: | |
4988 | /* Got a frame that can't be reassembled yet. | |
4989 | * Save it for later, and send SREJs to cover | |
4990 | * the missing frames. | |
4991 | */ | |
4992 | skb_queue_tail(&chan->srej_q, skb); | |
4993 | skb_in_use = 1; | |
4994 | BT_DBG("Queued %p (queue len %d)", skb, | |
4995 | skb_queue_len(&chan->srej_q)); | |
4996 | ||
4997 | l2cap_pass_to_tx(chan, control); | |
4998 | l2cap_send_srej(chan, control->txseq); | |
4999 | break; | |
5000 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
5001 | /* This frame was requested with an SREJ, but | |
5002 | * some expected retransmitted frames are | |
5003 | * missing. Request retransmission of missing | |
5004 | * SREJ'd frames. | |
5005 | */ | |
5006 | skb_queue_tail(&chan->srej_q, skb); | |
5007 | skb_in_use = 1; | |
5008 | BT_DBG("Queued %p (queue len %d)", skb, | |
5009 | skb_queue_len(&chan->srej_q)); | |
5010 | ||
5011 | l2cap_pass_to_tx(chan, control); | |
5012 | l2cap_send_srej_list(chan, control->txseq); | |
5013 | break; | |
5014 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
5015 | /* We've already queued this frame. Drop this copy. */ | |
5016 | l2cap_pass_to_tx(chan, control); | |
5017 | break; | |
5018 | case L2CAP_TXSEQ_DUPLICATE: | |
5019 | /* Expecting a later sequence number, so this frame | |
5020 | * was already received. Ignore it completely. | |
5021 | */ | |
5022 | break; | |
5023 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5024 | break; | |
5025 | case L2CAP_TXSEQ_INVALID: | |
5026 | default: | |
5027 | l2cap_send_disconn_req(chan->conn, chan, | |
5028 | ECONNRESET); | |
5029 | break; | |
5030 | } | |
5031 | break; | |
5032 | case L2CAP_EV_RECV_RR: | |
5033 | l2cap_pass_to_tx(chan, control); | |
5034 | if (control->final) { | |
5035 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5036 | ||
5037 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5038 | &chan->conn_state)) { | |
5039 | control->final = 0; | |
5040 | l2cap_retransmit_all(chan, control); | |
5041 | } | |
5042 | ||
5043 | l2cap_ertm_send(chan); | |
5044 | } else if (control->poll) { | |
5045 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5046 | &chan->conn_state) && | |
5047 | chan->unacked_frames) { | |
5048 | __set_retrans_timer(chan); | |
5049 | } | |
5050 | ||
5051 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5052 | l2cap_send_srej_tail(chan); | |
5053 | } else { | |
5054 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5055 | &chan->conn_state) && | |
5056 | chan->unacked_frames) | |
5057 | __set_retrans_timer(chan); | |
5058 | ||
5059 | l2cap_send_ack(chan); | |
5060 | } | |
5061 | break; | |
5062 | case L2CAP_EV_RECV_RNR: | |
5063 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5064 | l2cap_pass_to_tx(chan, control); | |
5065 | if (control->poll) { | |
5066 | l2cap_send_srej_tail(chan); | |
5067 | } else { | |
5068 | struct l2cap_ctrl rr_control; | |
5069 | memset(&rr_control, 0, sizeof(rr_control)); | |
5070 | rr_control.sframe = 1; | |
5071 | rr_control.super = L2CAP_SUPER_RR; | |
5072 | rr_control.reqseq = chan->buffer_seq; | |
5073 | l2cap_send_sframe(chan, &rr_control); | |
5074 | } | |
5075 | ||
5076 | break; | |
5077 | case L2CAP_EV_RECV_REJ: | |
5078 | l2cap_handle_rej(chan, control); | |
5079 | break; | |
5080 | case L2CAP_EV_RECV_SREJ: | |
5081 | l2cap_handle_srej(chan, control); | |
5082 | break; | |
5083 | } | |
5084 | ||
5085 | if (skb && !skb_in_use) { | |
5086 | BT_DBG("Freeing %p", skb); | |
5087 | kfree_skb(skb); | |
5088 | } | |
5089 | ||
5090 | return err; | |
5091 | } | |
5092 | ||
5093 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
5094 | { | |
5095 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5096 | u16 unacked; | |
5097 | ||
5098 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5099 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5100 | } | |
5101 | ||
cec8ab6e MM |
5102 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5103 | struct sk_buff *skb, u8 event) | |
218bb9df | 5104 | { |
d2a7ac5d MM |
5105 | int err = 0; |
5106 | ||
5107 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5108 | control, skb, event, chan->rx_state); | |
5109 | ||
5110 | if (__valid_reqseq(chan, control->reqseq)) { | |
5111 | switch (chan->rx_state) { | |
5112 | case L2CAP_RX_STATE_RECV: | |
5113 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5114 | break; | |
5115 | case L2CAP_RX_STATE_SREJ_SENT: | |
5116 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5117 | event); | |
5118 | break; | |
5119 | default: | |
5120 | /* shut it down */ | |
5121 | break; | |
5122 | } | |
5123 | } else { | |
5124 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5125 | control->reqseq, chan->next_tx_seq, | |
5126 | chan->expected_ack_seq); | |
5127 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5128 | } | |
5129 | ||
5130 | return err; | |
cec8ab6e MM |
5131 | } |
5132 | ||
5133 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5134 | struct sk_buff *skb) | |
5135 | { | |
4b51dae9 MM |
5136 | int err = 0; |
5137 | ||
5138 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5139 | chan->rx_state); | |
5140 | ||
5141 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5142 | L2CAP_TXSEQ_EXPECTED) { | |
5143 | l2cap_pass_to_tx(chan, control); | |
5144 | ||
5145 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5146 | __next_seq(chan, chan->buffer_seq)); | |
5147 | ||
5148 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5149 | ||
5150 | l2cap_reassemble_sdu(chan, skb, control); | |
5151 | } else { | |
5152 | if (chan->sdu) { | |
5153 | kfree_skb(chan->sdu); | |
5154 | chan->sdu = NULL; | |
5155 | } | |
5156 | chan->sdu_last_frag = NULL; | |
5157 | chan->sdu_len = 0; | |
5158 | ||
5159 | if (skb) { | |
5160 | BT_DBG("Freeing %p", skb); | |
5161 | kfree_skb(skb); | |
5162 | } | |
5163 | } | |
5164 | ||
5165 | chan->last_acked_seq = control->txseq; | |
5166 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5167 | ||
5168 | return err; | |
cec8ab6e MM |
5169 | } |
5170 | ||
5171 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5172 | { | |
5173 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5174 | u16 len; | |
5175 | u8 event; | |
218bb9df | 5176 | |
b76bbd66 MM |
5177 | __unpack_control(chan, skb); |
5178 | ||
218bb9df GP |
5179 | len = skb->len; |
5180 | ||
5181 | /* | |
5182 | * We can just drop the corrupted I-frame here. | |
5183 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5184 | * procedures and ask for retransmission. |
218bb9df | 5185 | */ |
47d1ec61 | 5186 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5187 | goto drop; |
5188 | ||
cec8ab6e | 5189 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5190 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5191 | |
47d1ec61 | 5192 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5193 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5194 | |
47d1ec61 | 5195 | if (len > chan->mps) { |
8c1d787b | 5196 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5197 | goto drop; |
5198 | } | |
5199 | ||
cec8ab6e MM |
5200 | if (!control->sframe) { |
5201 | int err; | |
218bb9df | 5202 | |
cec8ab6e MM |
5203 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5204 | control->sar, control->reqseq, control->final, | |
5205 | control->txseq); | |
218bb9df | 5206 | |
cec8ab6e MM |
5207 | /* Validate F-bit - F=0 always valid, F=1 only |
5208 | * valid in TX WAIT_F | |
5209 | */ | |
5210 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5211 | goto drop; |
cec8ab6e MM |
5212 | |
5213 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5214 | event = L2CAP_EV_RECV_IFRAME; | |
5215 | err = l2cap_rx(chan, control, skb, event); | |
5216 | } else { | |
5217 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5218 | } |
5219 | ||
cec8ab6e MM |
5220 | if (err) |
5221 | l2cap_send_disconn_req(chan->conn, chan, | |
5222 | ECONNRESET); | |
218bb9df | 5223 | } else { |
cec8ab6e MM |
5224 | const u8 rx_func_to_event[4] = { |
5225 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5226 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5227 | }; | |
5228 | ||
5229 | /* Only I-frames are expected in streaming mode */ | |
5230 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5231 | goto drop; | |
5232 | ||
5233 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5234 | control->reqseq, control->final, control->poll, | |
5235 | control->super); | |
5236 | ||
218bb9df GP |
5237 | if (len != 0) { |
5238 | BT_ERR("%d", len); | |
8c1d787b | 5239 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5240 | goto drop; |
5241 | } | |
5242 | ||
cec8ab6e MM |
5243 | /* Validate F and P bits */ |
5244 | if (control->final && (control->poll || | |
5245 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5246 | goto drop; | |
5247 | ||
5248 | event = rx_func_to_event[control->super]; | |
5249 | if (l2cap_rx(chan, control, skb, event)) | |
5250 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5251 | } |
5252 | ||
5253 | return 0; | |
5254 | ||
5255 | drop: | |
5256 | kfree_skb(skb); | |
5257 | return 0; | |
5258 | } | |
5259 | ||
13ca56e0 AE |
5260 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5261 | struct sk_buff *skb) | |
1da177e4 | 5262 | { |
48454079 | 5263 | struct l2cap_chan *chan; |
1da177e4 | 5264 | |
baa7e1fa | 5265 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5266 | if (!chan) { |
97e8e89d AE |
5267 | if (cid == L2CAP_CID_A2MP) { |
5268 | chan = a2mp_channel_create(conn, skb); | |
5269 | if (!chan) { | |
5270 | kfree_skb(skb); | |
13ca56e0 | 5271 | return; |
97e8e89d AE |
5272 | } |
5273 | ||
5274 | l2cap_chan_lock(chan); | |
5275 | } else { | |
5276 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5277 | /* Drop packet and return */ | |
5278 | kfree_skb(skb); | |
13ca56e0 | 5279 | return; |
97e8e89d | 5280 | } |
1da177e4 LT |
5281 | } |
5282 | ||
49208c9c | 5283 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5284 | |
89bc500e | 5285 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5286 | goto drop; |
5287 | ||
0c1bc5c6 | 5288 | switch (chan->mode) { |
1c2acffb GP |
5289 | case L2CAP_MODE_BASIC: |
5290 | /* If socket recv buffers overflows we drop data here | |
5291 | * which is *bad* because L2CAP has to be reliable. | |
5292 | * But we don't have any other choice. L2CAP doesn't | |
5293 | * provide flow control mechanism. */ | |
1da177e4 | 5294 | |
0c1bc5c6 | 5295 | if (chan->imtu < skb->len) |
1c2acffb | 5296 | goto drop; |
1da177e4 | 5297 | |
80b98027 | 5298 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5299 | goto done; |
5300 | break; | |
5301 | ||
5302 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5303 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5304 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5305 | goto done; |
5306 | ||
1c2acffb | 5307 | default: |
0c1bc5c6 | 5308 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5309 | break; |
5310 | } | |
1da177e4 LT |
5311 | |
5312 | drop: | |
5313 | kfree_skb(skb); | |
5314 | ||
5315 | done: | |
6be36555 | 5316 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5317 | } |
5318 | ||
84104b24 AE |
5319 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5320 | struct sk_buff *skb) | |
1da177e4 | 5321 | { |
23691d75 | 5322 | struct l2cap_chan *chan; |
1da177e4 | 5323 | |
c2287681 | 5324 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5325 | if (!chan) |
1da177e4 LT |
5326 | goto drop; |
5327 | ||
5b4cedaa | 5328 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5329 | |
89bc500e | 5330 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5331 | goto drop; |
5332 | ||
e13e21dc | 5333 | if (chan->imtu < skb->len) |
1da177e4 LT |
5334 | goto drop; |
5335 | ||
80b98027 | 5336 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5337 | return; |
1da177e4 LT |
5338 | |
5339 | drop: | |
5340 | kfree_skb(skb); | |
1da177e4 LT |
5341 | } |
5342 | ||
6810fca7 AE |
5343 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5344 | struct sk_buff *skb) | |
9f69bda6 | 5345 | { |
23691d75 | 5346 | struct l2cap_chan *chan; |
9f69bda6 | 5347 | |
c2287681 | 5348 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5349 | if (!chan) |
9f69bda6 GP |
5350 | goto drop; |
5351 | ||
5b4cedaa | 5352 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5353 | |
89bc500e | 5354 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5355 | goto drop; |
5356 | ||
e13e21dc | 5357 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5358 | goto drop; |
5359 | ||
80b98027 | 5360 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5361 | return; |
9f69bda6 GP |
5362 | |
5363 | drop: | |
5364 | kfree_skb(skb); | |
9f69bda6 GP |
5365 | } |
5366 | ||
1da177e4 LT |
5367 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5368 | { | |
5369 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5370 | u16 cid, len; |
5371 | __le16 psm; | |
1da177e4 LT |
5372 | |
5373 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5374 | cid = __le16_to_cpu(lh->cid); | |
5375 | len = __le16_to_cpu(lh->len); | |
5376 | ||
1c2acffb GP |
5377 | if (len != skb->len) { |
5378 | kfree_skb(skb); | |
5379 | return; | |
5380 | } | |
5381 | ||
1da177e4 LT |
5382 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5383 | ||
5384 | switch (cid) { | |
3300d9a9 | 5385 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5386 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5387 | l2cap_sig_channel(conn, skb); |
5388 | break; | |
5389 | ||
8db4dc46 | 5390 | case L2CAP_CID_CONN_LESS: |
097db76c | 5391 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5392 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5393 | l2cap_conless_channel(conn, psm, skb); |
5394 | break; | |
5395 | ||
9f69bda6 GP |
5396 | case L2CAP_CID_LE_DATA: |
5397 | l2cap_att_channel(conn, cid, skb); | |
5398 | break; | |
5399 | ||
b501d6a1 AB |
5400 | case L2CAP_CID_SMP: |
5401 | if (smp_sig_channel(conn, skb)) | |
5402 | l2cap_conn_del(conn->hcon, EACCES); | |
5403 | break; | |
5404 | ||
1da177e4 LT |
5405 | default: |
5406 | l2cap_data_channel(conn, cid, skb); | |
5407 | break; | |
5408 | } | |
5409 | } | |
5410 | ||
5411 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5412 | ||
686ebf28 | 5413 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5414 | { |
5415 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5416 | struct l2cap_chan *c; |
1da177e4 | 5417 | |
6ed93dc6 | 5418 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
5419 | |
5420 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5421 | read_lock(&chan_list_lock); |
5422 | list_for_each_entry(c, &chan_list, global_l) { | |
5423 | struct sock *sk = c->sk; | |
4343478f | 5424 | |
89bc500e | 5425 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5426 | continue; |
5427 | ||
5428 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5429 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5430 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5431 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5432 | exact++; |
2af6b9d5 MH |
5433 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5434 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5435 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5436 | lm2 |= HCI_LM_MASTER; |
5437 | } | |
1da177e4 | 5438 | } |
23691d75 | 5439 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5440 | |
5441 | return exact ? lm1 : lm2; | |
5442 | } | |
5443 | ||
9e664631 | 5444 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5445 | { |
0139418c MH |
5446 | struct l2cap_conn *conn; |
5447 | ||
6ed93dc6 | 5448 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 5449 | |
1da177e4 | 5450 | if (!status) { |
1da177e4 LT |
5451 | conn = l2cap_conn_add(hcon, status); |
5452 | if (conn) | |
5453 | l2cap_conn_ready(conn); | |
0139418c | 5454 | } else |
e175072f | 5455 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 | 5456 | |
1da177e4 LT |
5457 | } |
5458 | ||
686ebf28 | 5459 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5460 | { |
5461 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5462 | ||
5463 | BT_DBG("hcon %p", hcon); | |
5464 | ||
686ebf28 | 5465 | if (!conn) |
9f5a0d7b | 5466 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5467 | return conn->disc_reason; |
5468 | } | |
5469 | ||
9e664631 | 5470 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5471 | { |
5472 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5473 | ||
e175072f | 5474 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5475 | } |
5476 | ||
4343478f | 5477 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5478 | { |
715ec005 | 5479 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5480 | return; |
5481 | ||
f62e4323 | 5482 | if (encrypt == 0x00) { |
4343478f | 5483 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5484 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5485 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5486 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5487 | } else { |
4343478f | 5488 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5489 | __clear_chan_timer(chan); |
f62e4323 MH |
5490 | } |
5491 | } | |
5492 | ||
686ebf28 | 5493 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5494 | { |
0139418c | 5495 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5496 | struct l2cap_chan *chan; |
1da177e4 | 5497 | |
0139418c | 5498 | if (!conn) |
1da177e4 | 5499 | return 0; |
0139418c | 5500 | |
89d8b407 | 5501 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 5502 | |
160dc6ac | 5503 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5504 | if (!status && encrypt) |
5505 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5506 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5507 | } |
5508 | ||
3df91ea2 | 5509 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5510 | |
3df91ea2 | 5511 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5512 | l2cap_chan_lock(chan); |
1da177e4 | 5513 | |
89d8b407 AE |
5514 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
5515 | state_to_string(chan->state)); | |
f1cb9af5 | 5516 | |
78eb2f98 AE |
5517 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
5518 | l2cap_chan_unlock(chan); | |
5519 | continue; | |
5520 | } | |
5521 | ||
f1cb9af5 VCG |
5522 | if (chan->scid == L2CAP_CID_LE_DATA) { |
5523 | if (!status && encrypt) { | |
5524 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5525 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5526 | } |
5527 | ||
6be36555 | 5528 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5529 | continue; |
5530 | } | |
5531 | ||
c1360a1c | 5532 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5533 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5534 | continue; |
5535 | } | |
5536 | ||
89bc500e | 5537 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 5538 | chan->state == BT_CONFIG)) { |
a7d7723a GP |
5539 | struct sock *sk = chan->sk; |
5540 | ||
c5daa683 | 5541 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5542 | sk->sk_state_change(sk); |
5543 | ||
4343478f | 5544 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5545 | l2cap_chan_unlock(chan); |
9719f8af MH |
5546 | continue; |
5547 | } | |
5548 | ||
89bc500e | 5549 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5550 | if (!status) { |
93c3e8f5 | 5551 | l2cap_start_connection(chan); |
b1235d79 | 5552 | } else { |
ba13ccd9 | 5553 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5554 | } |
89bc500e | 5555 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5556 | struct sock *sk = chan->sk; |
b1235d79 | 5557 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5558 | __u16 res, stat; |
1da177e4 | 5559 | |
6be36555 AE |
5560 | lock_sock(sk); |
5561 | ||
b1235d79 | 5562 | if (!status) { |
c5daa683 GP |
5563 | if (test_bit(BT_SK_DEFER_SETUP, |
5564 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5565 | res = L2CAP_CR_PEND; |
5566 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 5567 | chan->ops->defer(chan); |
df3c3931 | 5568 | } else { |
0e587be7 | 5569 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5570 | res = L2CAP_CR_SUCCESS; |
5571 | stat = L2CAP_CS_NO_INFO; | |
5572 | } | |
b1235d79 | 5573 | } else { |
0e587be7 | 5574 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5575 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5576 | res = L2CAP_CR_SEC_BLOCK; |
5577 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5578 | } |
5579 | ||
6be36555 AE |
5580 | release_sock(sk); |
5581 | ||
fe4128e0 GP |
5582 | rsp.scid = cpu_to_le16(chan->dcid); |
5583 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5584 | rsp.result = cpu_to_le16(res); |
5585 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 5586 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 5587 | sizeof(rsp), &rsp); |
2d369359 MM |
5588 | |
5589 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5590 | res == L2CAP_CR_SUCCESS) { | |
5591 | char buf[128]; | |
5592 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5593 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5594 | L2CAP_CONF_REQ, | |
5595 | l2cap_build_conf_req(chan, buf), | |
5596 | buf); | |
5597 | chan->num_conf_req++; | |
5598 | } | |
b1235d79 | 5599 | } |
1da177e4 | 5600 | |
6be36555 | 5601 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5602 | } |
5603 | ||
3df91ea2 | 5604 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5605 | |
1da177e4 LT |
5606 | return 0; |
5607 | } | |
5608 | ||
686ebf28 | 5609 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5610 | { |
5611 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
5612 | struct l2cap_hdr *hdr; |
5613 | int len; | |
1da177e4 | 5614 | |
1d13a254 AE |
5615 | /* For AMP controller do not create l2cap conn */ |
5616 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
5617 | goto drop; | |
1da177e4 | 5618 | |
5a08ecce AE |
5619 | if (!conn) |
5620 | conn = l2cap_conn_add(hcon, 0); | |
5621 | ||
5622 | if (!conn) | |
1da177e4 LT |
5623 | goto drop; |
5624 | ||
5625 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5626 | ||
d73a0988 AE |
5627 | switch (flags) { |
5628 | case ACL_START: | |
5629 | case ACL_START_NO_FLUSH: | |
5630 | case ACL_COMPLETE: | |
1da177e4 LT |
5631 | if (conn->rx_len) { |
5632 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5633 | kfree_skb(conn->rx_skb); | |
5634 | conn->rx_skb = NULL; | |
5635 | conn->rx_len = 0; | |
5636 | l2cap_conn_unreliable(conn, ECOMM); | |
5637 | } | |
5638 | ||
aae7fe22 AE |
5639 | /* Start fragment always begin with Basic L2CAP header */ |
5640 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5641 | BT_ERR("Frame is too short (len %d)", skb->len); |
5642 | l2cap_conn_unreliable(conn, ECOMM); | |
5643 | goto drop; | |
5644 | } | |
5645 | ||
5646 | hdr = (struct l2cap_hdr *) skb->data; | |
5647 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5648 | ||
5649 | if (len == skb->len) { | |
5650 | /* Complete frame received */ | |
5651 | l2cap_recv_frame(conn, skb); | |
5652 | return 0; | |
5653 | } | |
5654 | ||
5655 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5656 | ||
5657 | if (skb->len > len) { | |
5658 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 5659 | skb->len, len); |
1da177e4 LT |
5660 | l2cap_conn_unreliable(conn, ECOMM); |
5661 | goto drop; | |
5662 | } | |
5663 | ||
5664 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 5665 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 5666 | if (!conn->rx_skb) |
1da177e4 LT |
5667 | goto drop; |
5668 | ||
d626f62b | 5669 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5670 | skb->len); |
1da177e4 | 5671 | conn->rx_len = len - skb->len; |
d73a0988 AE |
5672 | break; |
5673 | ||
5674 | case ACL_CONT: | |
1da177e4 LT |
5675 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
5676 | ||
5677 | if (!conn->rx_len) { | |
5678 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5679 | l2cap_conn_unreliable(conn, ECOMM); | |
5680 | goto drop; | |
5681 | } | |
5682 | ||
5683 | if (skb->len > conn->rx_len) { | |
5684 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 5685 | skb->len, conn->rx_len); |
1da177e4 LT |
5686 | kfree_skb(conn->rx_skb); |
5687 | conn->rx_skb = NULL; | |
5688 | conn->rx_len = 0; | |
5689 | l2cap_conn_unreliable(conn, ECOMM); | |
5690 | goto drop; | |
5691 | } | |
5692 | ||
d626f62b | 5693 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 5694 | skb->len); |
1da177e4 LT |
5695 | conn->rx_len -= skb->len; |
5696 | ||
5697 | if (!conn->rx_len) { | |
5698 | /* Complete frame received */ | |
5699 | l2cap_recv_frame(conn, conn->rx_skb); | |
5700 | conn->rx_skb = NULL; | |
5701 | } | |
d73a0988 | 5702 | break; |
1da177e4 LT |
5703 | } |
5704 | ||
5705 | drop: | |
5706 | kfree_skb(skb); | |
5707 | return 0; | |
5708 | } | |
5709 | ||
aef7d97c | 5710 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5711 | { |
23691d75 | 5712 | struct l2cap_chan *c; |
1da177e4 | 5713 | |
333055f2 | 5714 | read_lock(&chan_list_lock); |
1da177e4 | 5715 | |
23691d75 GP |
5716 | list_for_each_entry(c, &chan_list, global_l) { |
5717 | struct sock *sk = c->sk; | |
101545f6 | 5718 | |
fcb73338 AE |
5719 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
5720 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
5721 | c->state, __le16_to_cpu(c->psm), | |
5722 | c->scid, c->dcid, c->imtu, c->omtu, | |
5723 | c->sec_level, c->mode); | |
61e1b4b7 | 5724 | } |
1da177e4 | 5725 | |
333055f2 | 5726 | read_unlock(&chan_list_lock); |
1da177e4 | 5727 | |
aef7d97c | 5728 | return 0; |
1da177e4 LT |
5729 | } |
5730 | ||
aef7d97c MH |
5731 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5732 | { | |
5733 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5734 | } | |
5735 | ||
5736 | static const struct file_operations l2cap_debugfs_fops = { | |
5737 | .open = l2cap_debugfs_open, | |
5738 | .read = seq_read, | |
5739 | .llseek = seq_lseek, | |
5740 | .release = single_release, | |
5741 | }; | |
5742 | ||
5743 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5744 | |
64274518 | 5745 | int __init l2cap_init(void) |
1da177e4 LT |
5746 | { |
5747 | int err; | |
be9d1227 | 5748 | |
bb58f747 | 5749 | err = l2cap_init_sockets(); |
1da177e4 LT |
5750 | if (err < 0) |
5751 | return err; | |
5752 | ||
aef7d97c | 5753 | if (bt_debugfs) { |
2d792818 GP |
5754 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
5755 | NULL, &l2cap_debugfs_fops); | |
aef7d97c MH |
5756 | if (!l2cap_debugfs) |
5757 | BT_ERR("Failed to create L2CAP debug file"); | |
5758 | } | |
1da177e4 | 5759 | |
1da177e4 | 5760 | return 0; |
1da177e4 LT |
5761 | } |
5762 | ||
64274518 | 5763 | void l2cap_exit(void) |
1da177e4 | 5764 | { |
aef7d97c | 5765 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5766 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5767 | } |
5768 | ||
d1c4a17d GP |
5769 | module_param(disable_ertm, bool, 0644); |
5770 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |