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 LT |
50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
51 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
53 | void *data); | |
710f9b0a | 54 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 55 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 56 | struct l2cap_chan *chan, int err); |
1da177e4 | 57 | |
d660366d | 58 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
59 | struct sk_buff_head *skbs, u8 event); |
60 | ||
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
baa7e1fa | 63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 64 | { |
3df91ea2 | 65 | struct l2cap_chan *c; |
3d57dc68 | 66 | |
3df91ea2 AE |
67 | list_for_each_entry(c, &conn->chan_l, list) { |
68 | if (c->dcid == cid) | |
69 | return c; | |
0139418c | 70 | } |
3df91ea2 | 71 | return NULL; |
0139418c MH |
72 | } |
73 | ||
baa7e1fa | 74 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 75 | { |
3df91ea2 | 76 | struct l2cap_chan *c; |
3d57dc68 | 77 | |
3df91ea2 AE |
78 | list_for_each_entry(c, &conn->chan_l, list) { |
79 | if (c->scid == cid) | |
80 | return c; | |
0139418c | 81 | } |
3df91ea2 | 82 | return NULL; |
0139418c MH |
83 | } |
84 | ||
85 | /* Find channel with given SCID. | |
ef191ade | 86 | * Returns locked channel. */ |
baa7e1fa | 87 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 88 | { |
48454079 | 89 | struct l2cap_chan *c; |
baa7e1fa | 90 | |
3df91ea2 | 91 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 92 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
93 | if (c) |
94 | l2cap_chan_lock(c); | |
3df91ea2 AE |
95 | mutex_unlock(&conn->chan_lock); |
96 | ||
48454079 | 97 | return c; |
0139418c MH |
98 | } |
99 | ||
baa7e1fa | 100 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 101 | { |
3df91ea2 | 102 | struct l2cap_chan *c; |
3d57dc68 | 103 | |
3df91ea2 AE |
104 | list_for_each_entry(c, &conn->chan_l, list) { |
105 | if (c->ident == ident) | |
106 | return c; | |
0139418c | 107 | } |
3df91ea2 | 108 | return NULL; |
0139418c MH |
109 | } |
110 | ||
23691d75 | 111 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 112 | { |
23691d75 | 113 | struct l2cap_chan *c; |
9e4425ff | 114 | |
23691d75 GP |
115 | list_for_each_entry(c, &chan_list, global_l) { |
116 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 117 | return c; |
9e4425ff | 118 | } |
250938cb | 119 | return NULL; |
9e4425ff GP |
120 | } |
121 | ||
122 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
123 | { | |
73b2ec18 GP |
124 | int err; |
125 | ||
333055f2 | 126 | write_lock(&chan_list_lock); |
9e4425ff | 127 | |
23691d75 | 128 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
129 | err = -EADDRINUSE; |
130 | goto done; | |
9e4425ff GP |
131 | } |
132 | ||
73b2ec18 GP |
133 | if (psm) { |
134 | chan->psm = psm; | |
135 | chan->sport = psm; | |
136 | err = 0; | |
137 | } else { | |
138 | u16 p; | |
139 | ||
140 | err = -EINVAL; | |
141 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 142 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
143 | chan->psm = cpu_to_le16(p); |
144 | chan->sport = cpu_to_le16(p); | |
145 | err = 0; | |
146 | break; | |
147 | } | |
148 | } | |
9e4425ff | 149 | |
73b2ec18 | 150 | done: |
333055f2 | 151 | write_unlock(&chan_list_lock); |
73b2ec18 | 152 | return err; |
9e4425ff GP |
153 | } |
154 | ||
155 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
156 | { | |
333055f2 | 157 | write_lock(&chan_list_lock); |
9e4425ff GP |
158 | |
159 | chan->scid = scid; | |
160 | ||
333055f2 | 161 | write_unlock(&chan_list_lock); |
9e4425ff GP |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
baa7e1fa | 166 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 167 | { |
8db4dc46 | 168 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 169 | |
8db4dc46 | 170 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 171 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
172 | return cid; |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
0e587be7 | 178 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 179 | { |
42d2d87c | 180 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
181 | state_to_string(state)); |
182 | ||
89bc500e | 183 | chan->state = state; |
80b98027 | 184 | chan->ops->state_change(chan, state); |
89bc500e GP |
185 | } |
186 | ||
0e587be7 AE |
187 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
188 | { | |
189 | struct sock *sk = chan->sk; | |
190 | ||
191 | lock_sock(sk); | |
192 | __l2cap_state_change(chan, state); | |
193 | release_sock(sk); | |
194 | } | |
195 | ||
2e0052e4 AE |
196 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
197 | { | |
198 | struct sock *sk = chan->sk; | |
199 | ||
200 | sk->sk_err = err; | |
201 | } | |
202 | ||
203 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
204 | { | |
205 | struct sock *sk = chan->sk; | |
206 | ||
207 | lock_sock(sk); | |
208 | __l2cap_chan_set_err(chan, err); | |
209 | release_sock(sk); | |
210 | } | |
211 | ||
4239d16f MM |
212 | static void __set_retrans_timer(struct l2cap_chan *chan) |
213 | { | |
214 | if (!delayed_work_pending(&chan->monitor_timer) && | |
215 | chan->retrans_timeout) { | |
216 | l2cap_set_timer(chan, &chan->retrans_timer, | |
217 | msecs_to_jiffies(chan->retrans_timeout)); | |
218 | } | |
219 | } | |
220 | ||
221 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
222 | { | |
223 | __clear_retrans_timer(chan); | |
224 | if (chan->monitor_timeout) { | |
225 | l2cap_set_timer(chan, &chan->monitor_timer, | |
226 | msecs_to_jiffies(chan->monitor_timeout)); | |
227 | } | |
228 | } | |
229 | ||
608bcc6d MM |
230 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
231 | u16 seq) | |
232 | { | |
233 | struct sk_buff *skb; | |
234 | ||
235 | skb_queue_walk(head, skb) { | |
236 | if (bt_cb(skb)->control.txseq == seq) | |
237 | return skb; | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
3c588192 MM |
243 | /* ---- L2CAP sequence number lists ---- */ |
244 | ||
245 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
246 | * SREJ requests that are received and for frames that are to be | |
247 | * retransmitted. These seq_list functions implement a singly-linked | |
248 | * list in an array, where membership in the list can also be checked | |
249 | * in constant time. Items can also be added to the tail of the list | |
250 | * and removed from the head in constant time, without further memory | |
251 | * allocs or frees. | |
252 | */ | |
253 | ||
254 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
255 | { | |
256 | size_t alloc_size, i; | |
257 | ||
258 | /* Allocated size is a power of 2 to map sequence numbers | |
259 | * (which may be up to 14 bits) in to a smaller array that is | |
260 | * sized for the negotiated ERTM transmit windows. | |
261 | */ | |
262 | alloc_size = roundup_pow_of_two(size); | |
263 | ||
264 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
265 | if (!seq_list->list) | |
266 | return -ENOMEM; | |
267 | ||
268 | seq_list->mask = alloc_size - 1; | |
269 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
270 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
271 | for (i = 0; i < alloc_size; i++) | |
272 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
278 | { | |
279 | kfree(seq_list->list); | |
280 | } | |
281 | ||
282 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
283 | u16 seq) | |
284 | { | |
285 | /* Constant-time check for list membership */ | |
286 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
287 | } | |
288 | ||
289 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
290 | { | |
291 | u16 mask = seq_list->mask; | |
292 | ||
293 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
294 | /* In case someone tries to pop the head of an empty list */ | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } else if (seq_list->head == seq) { | |
297 | /* Head can be removed in constant time */ | |
298 | seq_list->head = seq_list->list[seq & mask]; | |
299 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
300 | ||
301 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
302 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
303 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
304 | } | |
305 | } else { | |
306 | /* Walk the list to find the sequence number */ | |
307 | u16 prev = seq_list->head; | |
308 | while (seq_list->list[prev & mask] != seq) { | |
309 | prev = seq_list->list[prev & mask]; | |
310 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
311 | return L2CAP_SEQ_LIST_CLEAR; | |
312 | } | |
313 | ||
314 | /* Unlink the number from the list and clear it */ | |
315 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
316 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
317 | if (seq_list->tail == seq) | |
318 | seq_list->tail = prev; | |
319 | } | |
320 | return seq; | |
321 | } | |
322 | ||
323 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | /* Remove the head in constant time */ | |
326 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
327 | } | |
328 | ||
329 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
330 | { | |
f522ae36 | 331 | u16 i; |
3c588192 | 332 | |
f522ae36 GP |
333 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
335 | ||
336 | for (i = 0; i <= seq_list->mask; i++) | |
337 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
338 | ||
339 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
340 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
341 | } |
342 | ||
343 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
344 | { | |
345 | u16 mask = seq_list->mask; | |
346 | ||
347 | /* All appends happen in constant time */ | |
348 | ||
f522ae36 GP |
349 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
350 | return; | |
3c588192 | 351 | |
f522ae36 GP |
352 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
353 | seq_list->head = seq; | |
354 | else | |
355 | seq_list->list[seq_list->tail & mask] = seq; | |
356 | ||
357 | seq_list->tail = seq; | |
358 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
359 | } |
360 | ||
721c4181 | 361 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 362 | { |
721c4181 GP |
363 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
364 | chan_timer.work); | |
3df91ea2 | 365 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
366 | int reason; |
367 | ||
e05dcc32 | 368 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 369 | |
3df91ea2 | 370 | mutex_lock(&conn->chan_lock); |
6be36555 | 371 | l2cap_chan_lock(chan); |
ab07801d | 372 | |
89bc500e | 373 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 374 | reason = ECONNREFUSED; |
89bc500e | 375 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
376 | chan->sec_level != BT_SECURITY_SDP) |
377 | reason = ECONNREFUSED; | |
378 | else | |
379 | reason = ETIMEDOUT; | |
380 | ||
0f852724 | 381 | l2cap_chan_close(chan, reason); |
ab07801d | 382 | |
6be36555 | 383 | l2cap_chan_unlock(chan); |
ab07801d | 384 | |
80b98027 | 385 | chan->ops->close(chan); |
3df91ea2 AE |
386 | mutex_unlock(&conn->chan_lock); |
387 | ||
371fd835 | 388 | l2cap_chan_put(chan); |
ab07801d GP |
389 | } |
390 | ||
eef1d9b6 | 391 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
392 | { |
393 | struct l2cap_chan *chan; | |
394 | ||
395 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
396 | if (!chan) | |
397 | return NULL; | |
398 | ||
c03b355e AE |
399 | mutex_init(&chan->lock); |
400 | ||
333055f2 | 401 | write_lock(&chan_list_lock); |
23691d75 | 402 | list_add(&chan->global_l, &chan_list); |
333055f2 | 403 | write_unlock(&chan_list_lock); |
23691d75 | 404 | |
721c4181 | 405 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 406 | |
89bc500e GP |
407 | chan->state = BT_OPEN; |
408 | ||
71ba0e56 GP |
409 | atomic_set(&chan->refcnt, 1); |
410 | ||
2827011f MM |
411 | /* This flag is cleared in l2cap_chan_ready() */ |
412 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
413 | ||
eef1d9b6 | 414 | BT_DBG("chan %p", chan); |
abc545b8 | 415 | |
48454079 GP |
416 | return chan; |
417 | } | |
418 | ||
23691d75 | 419 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 420 | { |
333055f2 | 421 | write_lock(&chan_list_lock); |
23691d75 | 422 | list_del(&chan->global_l); |
333055f2 | 423 | write_unlock(&chan_list_lock); |
23691d75 | 424 | |
371fd835 | 425 | l2cap_chan_put(chan); |
6ff5abbf GP |
426 | } |
427 | ||
bd4b1653 AE |
428 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
429 | { | |
430 | chan->fcs = L2CAP_FCS_CRC16; | |
431 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
432 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
434 | chan->sec_level = BT_SECURITY_LOW; | |
435 | ||
436 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
437 | } | |
438 | ||
14a28491 | 439 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 440 | { |
af05b30b | 441 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 442 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 443 | |
9f5a0d7b | 444 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 445 | |
8c1d787b | 446 | chan->conn = conn; |
0139418c | 447 | |
5491120e AE |
448 | switch (chan->chan_type) { |
449 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
450 | if (conn->hcon->type == LE_LINK) { |
451 | /* LE connection */ | |
0c1bc5c6 | 452 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
453 | chan->scid = L2CAP_CID_LE_DATA; |
454 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
455 | } else { |
456 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 457 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 458 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 459 | } |
5491120e AE |
460 | break; |
461 | ||
462 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 463 | /* Connectionless socket */ |
fe4128e0 GP |
464 | chan->scid = L2CAP_CID_CONN_LESS; |
465 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 466 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
467 | break; |
468 | ||
416fa752 AE |
469 | case L2CAP_CHAN_CONN_FIX_A2MP: |
470 | chan->scid = L2CAP_CID_A2MP; | |
471 | chan->dcid = L2CAP_CID_A2MP; | |
472 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
473 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
474 | break; | |
475 | ||
5491120e | 476 | default: |
0139418c | 477 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
478 | chan->scid = L2CAP_CID_SIGNALING; |
479 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 480 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
481 | } |
482 | ||
8f7975b1 AE |
483 | chan->local_id = L2CAP_BESTEFFORT_ID; |
484 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
485 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
486 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
487 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
488 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
489 | ||
371fd835 | 490 | l2cap_chan_hold(chan); |
baa7e1fa | 491 | |
3df91ea2 | 492 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
493 | } |
494 | ||
466f8004 | 495 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
496 | { |
497 | mutex_lock(&conn->chan_lock); | |
498 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 499 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
500 | } |
501 | ||
466f8004 | 502 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 503 | { |
8c1d787b | 504 | struct l2cap_conn *conn = chan->conn; |
0139418c | 505 | |
c9b66675 | 506 | __clear_chan_timer(chan); |
0139418c | 507 | |
49208c9c | 508 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 509 | |
8e87d142 | 510 | if (conn) { |
baa7e1fa | 511 | /* Delete from channel list */ |
3df91ea2 | 512 | list_del(&chan->list); |
3d57dc68 | 513 | |
371fd835 | 514 | l2cap_chan_put(chan); |
baa7e1fa | 515 | |
8c1d787b | 516 | chan->conn = NULL; |
3cabbfda AE |
517 | |
518 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
519 | hci_conn_put(conn->hcon); | |
0139418c MH |
520 | } |
521 | ||
c0df7f6e AE |
522 | if (chan->ops->teardown) |
523 | chan->ops->teardown(chan, err); | |
6be36555 | 524 | |
2827011f | 525 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 526 | return; |
2ead70b8 | 527 | |
ee556f66 GP |
528 | switch(chan->mode) { |
529 | case L2CAP_MODE_BASIC: | |
530 | break; | |
c13ffa62 | 531 | |
ee556f66 | 532 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
533 | __clear_retrans_timer(chan); |
534 | __clear_monitor_timer(chan); | |
535 | __clear_ack_timer(chan); | |
c13ffa62 | 536 | |
f1c6775b | 537 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 538 | |
3c588192 MM |
539 | l2cap_seq_list_free(&chan->srej_list); |
540 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
541 | |
542 | /* fall through */ | |
543 | ||
544 | case L2CAP_MODE_STREAMING: | |
545 | skb_queue_purge(&chan->tx_q); | |
546 | break; | |
c13ffa62 | 547 | } |
ee556f66 GP |
548 | |
549 | return; | |
0139418c MH |
550 | } |
551 | ||
0f852724 | 552 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
553 | { |
554 | struct l2cap_conn *conn = chan->conn; | |
555 | struct sock *sk = chan->sk; | |
556 | ||
e05dcc32 AE |
557 | BT_DBG("chan %p state %s sk %p", chan, |
558 | state_to_string(chan->state), sk); | |
4519de9a | 559 | |
89bc500e | 560 | switch (chan->state) { |
4519de9a | 561 | case BT_LISTEN: |
c0df7f6e AE |
562 | if (chan->ops->teardown) |
563 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
564 | break; |
565 | ||
566 | case BT_CONNECTED: | |
567 | case BT_CONFIG: | |
715ec005 | 568 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 569 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 570 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
571 | l2cap_send_disconn_req(conn, chan, reason); |
572 | } else | |
573 | l2cap_chan_del(chan, reason); | |
574 | break; | |
575 | ||
576 | case BT_CONNECT2: | |
715ec005 | 577 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
578 | conn->hcon->type == ACL_LINK) { |
579 | struct l2cap_conn_rsp rsp; | |
580 | __u16 result; | |
581 | ||
c5daa683 | 582 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
583 | result = L2CAP_CR_SEC_BLOCK; |
584 | else | |
585 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 586 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
587 | |
588 | rsp.scid = cpu_to_le16(chan->dcid); | |
589 | rsp.dcid = cpu_to_le16(chan->scid); | |
590 | rsp.result = cpu_to_le16(result); | |
ac73498c | 591 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
592 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
593 | sizeof(rsp), &rsp); | |
594 | } | |
595 | ||
596 | l2cap_chan_del(chan, reason); | |
597 | break; | |
598 | ||
599 | case BT_CONNECT: | |
600 | case BT_DISCONN: | |
601 | l2cap_chan_del(chan, reason); | |
602 | break; | |
603 | ||
604 | default: | |
c0df7f6e AE |
605 | if (chan->ops->teardown) |
606 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
607 | break; |
608 | } | |
609 | } | |
610 | ||
4343478f | 611 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 612 | { |
715ec005 | 613 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 614 | switch (chan->sec_level) { |
8556edd3 JH |
615 | case BT_SECURITY_HIGH: |
616 | return HCI_AT_DEDICATED_BONDING_MITM; | |
617 | case BT_SECURITY_MEDIUM: | |
618 | return HCI_AT_DEDICATED_BONDING; | |
619 | default: | |
620 | return HCI_AT_NO_BONDING; | |
621 | } | |
2983fd68 | 622 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
623 | if (chan->sec_level == BT_SECURITY_LOW) |
624 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 625 | |
4343478f | 626 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 627 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 628 | else |
8556edd3 | 629 | return HCI_AT_NO_BONDING; |
00ae4af9 | 630 | } else { |
4343478f | 631 | switch (chan->sec_level) { |
00ae4af9 | 632 | case BT_SECURITY_HIGH: |
8556edd3 | 633 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 634 | case BT_SECURITY_MEDIUM: |
8556edd3 | 635 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 636 | default: |
8556edd3 | 637 | return HCI_AT_NO_BONDING; |
00ae4af9 | 638 | } |
0684e5f9 | 639 | } |
8556edd3 JH |
640 | } |
641 | ||
642 | /* Service level security */ | |
d45fc423 | 643 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 644 | { |
8c1d787b | 645 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
646 | __u8 auth_type; |
647 | ||
4343478f | 648 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 649 | |
4343478f | 650 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
651 | } |
652 | ||
b5ad8b7f | 653 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
654 | { |
655 | u8 id; | |
656 | ||
657 | /* Get next available identificator. | |
658 | * 1 - 128 are used by kernel. | |
659 | * 129 - 199 are reserved. | |
660 | * 200 - 254 are used by utilities like l2ping, etc. | |
661 | */ | |
662 | ||
333055f2 | 663 | spin_lock(&conn->lock); |
4e8402a3 MH |
664 | |
665 | if (++conn->tx_ident > 128) | |
666 | conn->tx_ident = 1; | |
667 | ||
668 | id = conn->tx_ident; | |
669 | ||
333055f2 | 670 | spin_unlock(&conn->lock); |
4e8402a3 MH |
671 | |
672 | return id; | |
673 | } | |
674 | ||
4519de9a | 675 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
676 | { |
677 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 678 | u8 flags; |
4e8402a3 MH |
679 | |
680 | BT_DBG("code 0x%2.2x", code); | |
681 | ||
682 | if (!skb) | |
9a9c6a34 | 683 | return; |
4e8402a3 | 684 | |
e702112f AE |
685 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
686 | flags = ACL_START_NO_FLUSH; | |
687 | else | |
688 | flags = ACL_START; | |
689 | ||
14b12d0b | 690 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 691 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 692 | |
73d80deb LAD |
693 | hci_send_acl(conn->hchan, skb, flags); |
694 | } | |
695 | ||
696 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
697 | { | |
698 | struct hci_conn *hcon = chan->conn->hcon; | |
699 | u16 flags; | |
700 | ||
701 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
702 | skb->priority); | |
703 | ||
704 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
705 | lmp_no_flush_capable(hcon->hdev)) | |
706 | flags = ACL_START_NO_FLUSH; | |
707 | else | |
708 | flags = ACL_START; | |
14b12d0b | 709 | |
73d80deb LAD |
710 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
711 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
712 | } |
713 | ||
b76bbd66 MM |
714 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
715 | { | |
716 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
717 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
718 | ||
719 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
720 | /* S-Frame */ | |
721 | control->sframe = 1; | |
722 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
723 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
724 | ||
725 | control->sar = 0; | |
726 | control->txseq = 0; | |
727 | } else { | |
728 | /* I-Frame */ | |
729 | control->sframe = 0; | |
730 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
731 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
732 | ||
733 | control->poll = 0; | |
734 | control->super = 0; | |
735 | } | |
736 | } | |
737 | ||
b76bbd66 MM |
738 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
739 | { | |
740 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
741 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
742 | ||
743 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
744 | /* S-Frame */ | |
745 | control->sframe = 1; | |
746 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
747 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
748 | ||
749 | control->sar = 0; | |
750 | control->txseq = 0; | |
751 | } else { | |
752 | /* I-Frame */ | |
753 | control->sframe = 0; | |
754 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
755 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
756 | ||
757 | control->poll = 0; | |
758 | control->super = 0; | |
759 | } | |
760 | } | |
761 | ||
762 | static inline void __unpack_control(struct l2cap_chan *chan, | |
763 | struct sk_buff *skb) | |
764 | { | |
765 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
766 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
767 | &bt_cb(skb)->control); | |
cec8ab6e | 768 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
769 | } else { |
770 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
771 | &bt_cb(skb)->control); | |
cec8ab6e | 772 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
773 | } |
774 | } | |
775 | ||
b5c6aaed MM |
776 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
777 | { | |
778 | u32 packed; | |
779 | ||
780 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
781 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
782 | ||
783 | if (control->sframe) { | |
784 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
785 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
786 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
787 | } else { | |
788 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
789 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
790 | } | |
791 | ||
792 | return packed; | |
793 | } | |
794 | ||
795 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
796 | { | |
797 | u16 packed; | |
798 | ||
799 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
800 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
801 | ||
802 | if (control->sframe) { | |
803 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
804 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
805 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
806 | } else { | |
807 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
808 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
809 | } | |
810 | ||
811 | return packed; | |
812 | } | |
813 | ||
b76bbd66 MM |
814 | static inline void __pack_control(struct l2cap_chan *chan, |
815 | struct l2cap_ctrl *control, | |
816 | struct sk_buff *skb) | |
817 | { | |
818 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
819 | put_unaligned_le32(__pack_extended_control(control), | |
820 | skb->data + L2CAP_HDR_SIZE); | |
821 | } else { | |
822 | put_unaligned_le16(__pack_enhanced_control(control), | |
823 | skb->data + L2CAP_HDR_SIZE); | |
824 | } | |
825 | } | |
826 | ||
a67d7f6f MM |
827 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
828 | u32 control) | |
b5c6aaed MM |
829 | { |
830 | struct sk_buff *skb; | |
831 | struct l2cap_hdr *lh; | |
a67d7f6f | 832 | int hlen; |
b5c6aaed MM |
833 | |
834 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
835 | hlen = L2CAP_EXT_HDR_SIZE; | |
836 | else | |
837 | hlen = L2CAP_ENH_HDR_SIZE; | |
838 | ||
839 | if (chan->fcs == L2CAP_FCS_CRC16) | |
840 | hlen += L2CAP_FCS_SIZE; | |
841 | ||
a67d7f6f | 842 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 843 | |
b5c6aaed | 844 | if (!skb) |
a67d7f6f | 845 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
846 | |
847 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
848 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
849 | lh->cid = cpu_to_le16(chan->dcid); | |
850 | ||
a67d7f6f MM |
851 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
852 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
853 | else | |
854 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
855 | |
856 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 857 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
858 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
859 | } | |
860 | ||
861 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
862 | return skb; |
863 | } | |
864 | ||
865 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
866 | struct l2cap_ctrl *control) | |
867 | { | |
868 | struct sk_buff *skb; | |
869 | u32 control_field; | |
870 | ||
871 | BT_DBG("chan %p, control %p", chan, control); | |
872 | ||
873 | if (!control->sframe) | |
874 | return; | |
875 | ||
876 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
877 | !control->poll) | |
878 | control->final = 1; | |
879 | ||
880 | if (control->super == L2CAP_SUPER_RR) | |
881 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
882 | else if (control->super == L2CAP_SUPER_RNR) | |
883 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
884 | ||
885 | if (control->super != L2CAP_SUPER_SREJ) { | |
886 | chan->last_acked_seq = control->reqseq; | |
887 | __clear_ack_timer(chan); | |
888 | } | |
889 | ||
890 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
891 | control->final, control->poll, control->super); | |
892 | ||
893 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
894 | control_field = __pack_extended_control(control); | |
895 | else | |
896 | control_field = __pack_enhanced_control(control); | |
897 | ||
898 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
899 | if (!IS_ERR(skb)) | |
900 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
901 | } |
902 | ||
c9e3d5e0 | 903 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 904 | { |
c9e3d5e0 MM |
905 | struct l2cap_ctrl control; |
906 | ||
907 | BT_DBG("chan %p, poll %d", chan, poll); | |
908 | ||
909 | memset(&control, 0, sizeof(control)); | |
910 | control.sframe = 1; | |
911 | control.poll = poll; | |
912 | ||
913 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
914 | control.super = L2CAP_SUPER_RNR; | |
915 | else | |
916 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 917 | |
c9e3d5e0 MM |
918 | control.reqseq = chan->buffer_seq; |
919 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
920 | } |
921 | ||
b4450035 | 922 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 923 | { |
c1360a1c | 924 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
925 | } |
926 | ||
9b27f350 AE |
927 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
928 | { | |
929 | struct l2cap_conn *conn = chan->conn; | |
930 | struct l2cap_conn_req req; | |
931 | ||
932 | req.scid = cpu_to_le16(chan->scid); | |
933 | req.psm = chan->psm; | |
934 | ||
935 | chan->ident = l2cap_get_ident(conn); | |
936 | ||
937 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
938 | ||
939 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
940 | } | |
941 | ||
9f0caeb1 VCG |
942 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
943 | { | |
2827011f | 944 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
945 | chan->conf_state = 0; |
946 | __clear_chan_timer(chan); | |
947 | ||
54a59aa2 | 948 | chan->state = BT_CONNECTED; |
9f0caeb1 | 949 | |
fd83e2c2 | 950 | chan->ops->ready(chan); |
9f0caeb1 VCG |
951 | } |
952 | ||
fc7f8a7e | 953 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 954 | { |
8c1d787b | 955 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 956 | |
9f0caeb1 VCG |
957 | if (conn->hcon->type == LE_LINK) { |
958 | l2cap_chan_ready(chan); | |
959 | return; | |
960 | } | |
961 | ||
79d554a6 | 962 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
963 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
964 | return; | |
965 | ||
d45fc423 | 966 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
967 | __l2cap_no_conn_pending(chan)) |
968 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
969 | } else { |
970 | struct l2cap_info_req req; | |
ac73498c | 971 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
972 | |
973 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
974 | conn->info_ident = l2cap_get_ident(conn); | |
975 | ||
ba13ccd9 | 976 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
977 | |
978 | l2cap_send_cmd(conn, conn->info_ident, | |
979 | L2CAP_INFO_REQ, sizeof(req), &req); | |
980 | } | |
981 | } | |
982 | ||
cf6c2c0b GP |
983 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
984 | { | |
985 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 986 | if (!disable_ertm) |
cf6c2c0b GP |
987 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
988 | ||
989 | switch (mode) { | |
990 | case L2CAP_MODE_ERTM: | |
991 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
992 | case L2CAP_MODE_STREAMING: | |
993 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
994 | default: | |
995 | return 0x00; | |
996 | } | |
997 | } | |
998 | ||
4519de9a | 999 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1000 | { |
6be36555 | 1001 | struct sock *sk = chan->sk; |
22121fc9 GP |
1002 | struct l2cap_disconn_req req; |
1003 | ||
c13ffa62 GP |
1004 | if (!conn) |
1005 | return; | |
1006 | ||
0c1bc5c6 | 1007 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1008 | __clear_retrans_timer(chan); |
1009 | __clear_monitor_timer(chan); | |
1010 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1011 | } |
1012 | ||
416fa752 AE |
1013 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1014 | __l2cap_state_change(chan, BT_DISCONN); | |
1015 | return; | |
1016 | } | |
1017 | ||
fe4128e0 GP |
1018 | req.dcid = cpu_to_le16(chan->dcid); |
1019 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1020 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1021 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1022 | |
6be36555 | 1023 | lock_sock(sk); |
0e587be7 | 1024 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1025 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1026 | release_sock(sk); |
22121fc9 GP |
1027 | } |
1028 | ||
1da177e4 | 1029 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1030 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1031 | { | |
3df91ea2 | 1032 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1033 | |
1034 | BT_DBG("conn %p", conn); | |
1035 | ||
3df91ea2 | 1036 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1037 | |
3df91ea2 | 1038 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1039 | struct sock *sk = chan->sk; |
baa7e1fa | 1040 | |
6be36555 | 1041 | l2cap_chan_lock(chan); |
4e8402a3 | 1042 | |
715ec005 | 1043 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1044 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1045 | continue; |
1046 | } | |
1047 | ||
89bc500e | 1048 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1049 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1050 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1051 | l2cap_chan_unlock(chan); |
47731de7 GP |
1052 | continue; |
1053 | } | |
79d554a6 | 1054 | |
c1360a1c GP |
1055 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1056 | && test_bit(CONF_STATE2_DEVICE, | |
1057 | &chan->conf_state)) { | |
89bc500e | 1058 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1059 | l2cap_chan_unlock(chan); |
47731de7 | 1060 | continue; |
b1235d79 | 1061 | } |
47731de7 | 1062 | |
9b27f350 | 1063 | l2cap_send_conn_req(chan); |
47731de7 | 1064 | |
89bc500e | 1065 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1066 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1067 | char buf[128]; |
fe4128e0 GP |
1068 | rsp.scid = cpu_to_le16(chan->dcid); |
1069 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1070 | |
d45fc423 | 1071 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1072 | lock_sock(sk); |
c5daa683 GP |
1073 | if (test_bit(BT_SK_DEFER_SETUP, |
1074 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1075 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1076 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1077 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1078 | if (parent) |
1079 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1080 | |
1081 | } else { | |
0e587be7 | 1082 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1083 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1084 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1085 | } |
6be36555 | 1086 | release_sock(sk); |
79d554a6 | 1087 | } else { |
ac73498c AE |
1088 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1089 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1090 | } |
1091 | ||
fc7f8a7e GP |
1092 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1093 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1094 | |
c1360a1c | 1095 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1096 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1097 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1098 | continue; |
1099 | } | |
1100 | ||
c1360a1c | 1101 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1102 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1103 | l2cap_build_conf_req(chan, buf), buf); |
1104 | chan->num_conf_req++; | |
4e8402a3 MH |
1105 | } |
1106 | ||
6be36555 | 1107 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1108 | } |
1109 | ||
3df91ea2 | 1110 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1111 | } |
1112 | ||
c2287681 | 1113 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1114 | * Returns closest match, locked. |
1115 | */ | |
d9b88702 | 1116 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1117 | bdaddr_t *src, |
1118 | bdaddr_t *dst) | |
b62f328b | 1119 | { |
23691d75 | 1120 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1121 | |
23691d75 | 1122 | read_lock(&chan_list_lock); |
b62f328b | 1123 | |
23691d75 GP |
1124 | list_for_each_entry(c, &chan_list, global_l) { |
1125 | struct sock *sk = c->sk; | |
fe4128e0 | 1126 | |
89bc500e | 1127 | if (state && c->state != state) |
b62f328b VT |
1128 | continue; |
1129 | ||
23691d75 | 1130 | if (c->scid == cid) { |
c2287681 IY |
1131 | int src_match, dst_match; |
1132 | int src_any, dst_any; | |
1133 | ||
b62f328b | 1134 | /* Exact match. */ |
c2287681 IY |
1135 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1136 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1137 | if (src_match && dst_match) { | |
23691d75 GP |
1138 | read_unlock(&chan_list_lock); |
1139 | return c; | |
1140 | } | |
b62f328b VT |
1141 | |
1142 | /* Closest match */ | |
c2287681 IY |
1143 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1144 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1145 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1146 | (src_any && dst_any)) | |
23691d75 | 1147 | c1 = c; |
b62f328b VT |
1148 | } |
1149 | } | |
280f294f | 1150 | |
23691d75 | 1151 | read_unlock(&chan_list_lock); |
b62f328b | 1152 | |
23691d75 | 1153 | return c1; |
b62f328b VT |
1154 | } |
1155 | ||
1156 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1157 | { | |
c916fbe4 | 1158 | struct sock *parent, *sk; |
23691d75 | 1159 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1160 | |
1161 | BT_DBG(""); | |
1162 | ||
1163 | /* Check if we have socket listening on cid */ | |
23691d75 | 1164 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1165 | conn->src, conn->dst); |
23691d75 | 1166 | if (!pchan) |
b62f328b VT |
1167 | return; |
1168 | ||
23691d75 GP |
1169 | parent = pchan->sk; |
1170 | ||
aa2ac881 | 1171 | lock_sock(parent); |
62f3a2cf | 1172 | |
80b98027 | 1173 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1174 | if (!chan) |
b62f328b VT |
1175 | goto clean; |
1176 | ||
80808e43 | 1177 | sk = chan->sk; |
5d41ce1d | 1178 | |
b62f328b VT |
1179 | hci_conn_hold(conn->hcon); |
1180 | ||
b62f328b VT |
1181 | bacpy(&bt_sk(sk)->src, conn->src); |
1182 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1183 | ||
d1010240 GP |
1184 | bt_accept_enqueue(parent, sk); |
1185 | ||
3d57dc68 | 1186 | l2cap_chan_add(conn, chan); |
48454079 | 1187 | |
6754e0df | 1188 | l2cap_chan_ready(chan); |
b62f328b | 1189 | |
b62f328b | 1190 | clean: |
aa2ac881 | 1191 | release_sock(parent); |
b62f328b VT |
1192 | } |
1193 | ||
4e8402a3 MH |
1194 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1195 | { | |
48454079 | 1196 | struct l2cap_chan *chan; |
4e8402a3 | 1197 | |
79d554a6 | 1198 | BT_DBG("conn %p", conn); |
4e8402a3 | 1199 | |
b62f328b VT |
1200 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1201 | l2cap_le_conn_ready(conn); | |
1202 | ||
160dc6ac VCG |
1203 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1204 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1205 | ||
3df91ea2 | 1206 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1207 | |
3df91ea2 | 1208 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1209 | |
6be36555 | 1210 | l2cap_chan_lock(chan); |
4e8402a3 | 1211 | |
416fa752 AE |
1212 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1213 | l2cap_chan_unlock(chan); | |
1214 | continue; | |
1215 | } | |
1216 | ||
63128451 | 1217 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1218 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1219 | l2cap_chan_ready(chan); |
acd7d370 | 1220 | |
63128451 | 1221 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1222 | struct sock *sk = chan->sk; |
c9b66675 | 1223 | __clear_chan_timer(chan); |
6be36555 | 1224 | lock_sock(sk); |
0e587be7 | 1225 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1226 | sk->sk_state_change(sk); |
6be36555 | 1227 | release_sock(sk); |
b501d6a1 | 1228 | |
89bc500e | 1229 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1230 | l2cap_do_start(chan); |
4e8402a3 | 1231 | |
6be36555 | 1232 | l2cap_chan_unlock(chan); |
4e8402a3 | 1233 | } |
79d554a6 | 1234 | |
3df91ea2 | 1235 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1236 | } |
1237 | ||
1238 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1239 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1240 | { | |
48454079 | 1241 | struct l2cap_chan *chan; |
4e8402a3 MH |
1242 | |
1243 | BT_DBG("conn %p", conn); | |
1244 | ||
3df91ea2 | 1245 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1246 | |
3df91ea2 | 1247 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1248 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1249 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1250 | } |
1251 | ||
3df91ea2 | 1252 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1253 | } |
1254 | ||
f878fcad | 1255 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1256 | { |
f878fcad | 1257 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1258 | info_timer.work); |
4e8402a3 | 1259 | |
984947dc | 1260 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1261 | conn->info_ident = 0; |
984947dc | 1262 | |
4e8402a3 MH |
1263 | l2cap_conn_start(conn); |
1264 | } | |
1265 | ||
5d3de7df VCG |
1266 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1267 | { | |
1268 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1269 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1270 | |
1271 | if (!conn) | |
1272 | return; | |
1273 | ||
1274 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1275 | ||
1276 | kfree_skb(conn->rx_skb); | |
1277 | ||
3df91ea2 AE |
1278 | mutex_lock(&conn->chan_lock); |
1279 | ||
5d3de7df VCG |
1280 | /* Kill channels */ |
1281 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1282 | l2cap_chan_hold(chan); |
6be36555 AE |
1283 | l2cap_chan_lock(chan); |
1284 | ||
5d3de7df | 1285 | l2cap_chan_del(chan, err); |
6be36555 AE |
1286 | |
1287 | l2cap_chan_unlock(chan); | |
1288 | ||
80b98027 | 1289 | chan->ops->close(chan); |
61d6ef3e | 1290 | l2cap_chan_put(chan); |
5d3de7df VCG |
1291 | } |
1292 | ||
3df91ea2 AE |
1293 | mutex_unlock(&conn->chan_lock); |
1294 | ||
73d80deb LAD |
1295 | hci_chan_del(conn->hchan); |
1296 | ||
5d3de7df | 1297 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1298 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1299 | |
51a8efd7 | 1300 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1301 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1302 | smp_chan_destroy(conn); |
d26a2345 | 1303 | } |
5d3de7df VCG |
1304 | |
1305 | hcon->l2cap_data = NULL; | |
1306 | kfree(conn); | |
1307 | } | |
1308 | ||
6c9d42a1 | 1309 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1310 | { |
6c9d42a1 GP |
1311 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1312 | security_timer.work); | |
5d3de7df VCG |
1313 | |
1314 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1315 | } | |
1316 | ||
1da177e4 LT |
1317 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1318 | { | |
0139418c | 1319 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1320 | struct hci_chan *hchan; |
1da177e4 | 1321 | |
0139418c | 1322 | if (conn || status) |
1da177e4 LT |
1323 | return conn; |
1324 | ||
73d80deb LAD |
1325 | hchan = hci_chan_create(hcon); |
1326 | if (!hchan) | |
1327 | return NULL; | |
1328 | ||
0139418c | 1329 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1330 | if (!conn) { |
1331 | hci_chan_del(hchan); | |
1da177e4 | 1332 | return NULL; |
73d80deb | 1333 | } |
1da177e4 LT |
1334 | |
1335 | hcon->l2cap_data = conn; | |
1336 | conn->hcon = hcon; | |
73d80deb | 1337 | conn->hchan = hchan; |
1da177e4 | 1338 | |
73d80deb | 1339 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1340 | |
acd7d370 VT |
1341 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1342 | conn->mtu = hcon->hdev->le_mtu; | |
1343 | else | |
1344 | conn->mtu = hcon->hdev->acl_mtu; | |
1345 | ||
1da177e4 LT |
1346 | conn->src = &hcon->hdev->bdaddr; |
1347 | conn->dst = &hcon->dst; | |
1348 | ||
4e8402a3 MH |
1349 | conn->feat_mask = 0; |
1350 | ||
1da177e4 | 1351 | spin_lock_init(&conn->lock); |
3df91ea2 | 1352 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1353 | |
1354 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1355 | |
5d3de7df | 1356 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1357 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1358 | else |
030013d8 | 1359 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1360 | |
9f5a0d7b | 1361 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1362 | |
1da177e4 LT |
1363 | return conn; |
1364 | } | |
1365 | ||
1da177e4 | 1366 | /* ---- Socket interface ---- */ |
1da177e4 | 1367 | |
c2287681 | 1368 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1369 | * Returns closest match. |
1370 | */ | |
c2287681 IY |
1371 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1372 | bdaddr_t *src, | |
1373 | bdaddr_t *dst) | |
1da177e4 | 1374 | { |
23691d75 | 1375 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1376 | |
23691d75 | 1377 | read_lock(&chan_list_lock); |
e0f0cb56 | 1378 | |
23691d75 GP |
1379 | list_for_each_entry(c, &chan_list, global_l) { |
1380 | struct sock *sk = c->sk; | |
fe4128e0 | 1381 | |
89bc500e | 1382 | if (state && c->state != state) |
1da177e4 LT |
1383 | continue; |
1384 | ||
23691d75 | 1385 | if (c->psm == psm) { |
c2287681 IY |
1386 | int src_match, dst_match; |
1387 | int src_any, dst_any; | |
1388 | ||
1da177e4 | 1389 | /* Exact match. */ |
c2287681 IY |
1390 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1391 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1392 | if (src_match && dst_match) { | |
a7567b20 | 1393 | read_unlock(&chan_list_lock); |
23691d75 GP |
1394 | return c; |
1395 | } | |
1da177e4 LT |
1396 | |
1397 | /* Closest match */ | |
c2287681 IY |
1398 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1399 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1400 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1401 | (src_any && dst_any)) | |
23691d75 | 1402 | c1 = c; |
1da177e4 LT |
1403 | } |
1404 | } | |
1da177e4 | 1405 | |
23691d75 | 1406 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1407 | |
23691d75 | 1408 | return c1; |
1da177e4 LT |
1409 | } |
1410 | ||
8e9f9892 AG |
1411 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1412 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1413 | { |
5d41ce1d | 1414 | struct sock *sk = chan->sk; |
1da177e4 | 1415 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1416 | struct l2cap_conn *conn; |
1417 | struct hci_conn *hcon; | |
1418 | struct hci_dev *hdev; | |
09ab6f4c | 1419 | __u8 auth_type; |
44d0e48e | 1420 | int err; |
1da177e4 | 1421 | |
8e9f9892 AG |
1422 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1423 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1424 | |
af05b30b GP |
1425 | hdev = hci_get_route(dst, src); |
1426 | if (!hdev) | |
1da177e4 LT |
1427 | return -EHOSTUNREACH; |
1428 | ||
09fd0de5 | 1429 | hci_dev_lock(hdev); |
1da177e4 | 1430 | |
6be36555 | 1431 | l2cap_chan_lock(chan); |
03a00194 GP |
1432 | |
1433 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1434 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1435 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1436 | err = -EINVAL; | |
1437 | goto done; | |
1438 | } | |
1439 | ||
1440 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1441 | err = -EINVAL; | |
1442 | goto done; | |
1443 | } | |
1444 | ||
1445 | switch (chan->mode) { | |
1446 | case L2CAP_MODE_BASIC: | |
1447 | break; | |
1448 | case L2CAP_MODE_ERTM: | |
1449 | case L2CAP_MODE_STREAMING: | |
1450 | if (!disable_ertm) | |
1451 | break; | |
1452 | /* fall through */ | |
1453 | default: | |
1454 | err = -ENOTSUPP; | |
1455 | goto done; | |
1456 | } | |
1457 | ||
0797e01d | 1458 | switch (chan->state) { |
03a00194 GP |
1459 | case BT_CONNECT: |
1460 | case BT_CONNECT2: | |
1461 | case BT_CONFIG: | |
1462 | /* Already connecting */ | |
1463 | err = 0; | |
1464 | goto done; | |
1465 | ||
1466 | case BT_CONNECTED: | |
1467 | /* Already connected */ | |
1468 | err = -EISCONN; | |
1469 | goto done; | |
1470 | ||
1471 | case BT_OPEN: | |
1472 | case BT_BOUND: | |
1473 | /* Can connect */ | |
1474 | break; | |
1475 | ||
1476 | default: | |
1477 | err = -EBADFD; | |
1478 | goto done; | |
1479 | } | |
1480 | ||
1481 | /* Set destination address and psm */ | |
0797e01d | 1482 | lock_sock(sk); |
9219b2a0 | 1483 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1484 | release_sock(sk); |
1485 | ||
03a00194 GP |
1486 | chan->psm = psm; |
1487 | chan->dcid = cid; | |
1da177e4 | 1488 | |
4343478f | 1489 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1490 | |
fe4128e0 | 1491 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1492 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1493 | chan->sec_level, auth_type); |
acd7d370 | 1494 | else |
8e9f9892 | 1495 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1496 | chan->sec_level, auth_type); |
acd7d370 | 1497 | |
30e76272 VT |
1498 | if (IS_ERR(hcon)) { |
1499 | err = PTR_ERR(hcon); | |
1da177e4 | 1500 | goto done; |
30e76272 | 1501 | } |
1da177e4 LT |
1502 | |
1503 | conn = l2cap_conn_add(hcon, 0); | |
1504 | if (!conn) { | |
1505 | hci_conn_put(hcon); | |
30e76272 | 1506 | err = -ENOMEM; |
1da177e4 LT |
1507 | goto done; |
1508 | } | |
1509 | ||
9f0caeb1 VCG |
1510 | if (hcon->type == LE_LINK) { |
1511 | err = 0; | |
1512 | ||
1513 | if (!list_empty(&conn->chan_l)) { | |
1514 | err = -EBUSY; | |
1515 | hci_conn_put(hcon); | |
1516 | } | |
1517 | ||
1518 | if (err) | |
1519 | goto done; | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | /* Update source addr of the socket */ |
1523 | bacpy(src, conn->src); | |
1524 | ||
6be36555 | 1525 | l2cap_chan_unlock(chan); |
48454079 | 1526 | l2cap_chan_add(conn, chan); |
6be36555 | 1527 | l2cap_chan_lock(chan); |
48454079 | 1528 | |
6be36555 | 1529 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1530 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1531 | |
1532 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1533 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1534 | __clear_chan_timer(chan); |
d45fc423 | 1535 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1536 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1537 | } else |
fc7f8a7e | 1538 | l2cap_do_start(chan); |
1da177e4 LT |
1539 | } |
1540 | ||
30e76272 VT |
1541 | err = 0; |
1542 | ||
1da177e4 | 1543 | done: |
6be36555 | 1544 | l2cap_chan_unlock(chan); |
09fd0de5 | 1545 | hci_dev_unlock(hdev); |
1da177e4 LT |
1546 | hci_dev_put(hdev); |
1547 | return err; | |
1548 | } | |
1549 | ||
dcba0dba | 1550 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1551 | { |
8c1d787b | 1552 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1553 | DECLARE_WAITQUEUE(wait, current); |
1554 | int err = 0; | |
1555 | int timeo = HZ/5; | |
1556 | ||
2b0b05dd | 1557 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1558 | set_current_state(TASK_INTERRUPTIBLE); |
1559 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1560 | if (!timeo) |
1561 | timeo = HZ/5; | |
1562 | ||
1563 | if (signal_pending(current)) { | |
1564 | err = sock_intr_errno(timeo); | |
1565 | break; | |
1566 | } | |
1567 | ||
1568 | release_sock(sk); | |
1569 | timeo = schedule_timeout(timeo); | |
1570 | lock_sock(sk); | |
a71a0cf4 | 1571 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1572 | |
1573 | err = sock_error(sk); | |
1574 | if (err) | |
1575 | break; | |
1576 | } | |
1577 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1578 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1579 | return err; |
1580 | } | |
1581 | ||
721c4181 | 1582 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1583 | { |
721c4181 | 1584 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1585 | monitor_timer.work); |
e90bac06 | 1586 | |
525cd185 | 1587 | BT_DBG("chan %p", chan); |
0e98958d | 1588 | |
6be36555 AE |
1589 | l2cap_chan_lock(chan); |
1590 | ||
80909e04 | 1591 | if (!chan->conn) { |
6be36555 | 1592 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1593 | l2cap_chan_put(chan); |
e90bac06 GP |
1594 | return; |
1595 | } | |
1596 | ||
401bb1f7 | 1597 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1598 | |
6be36555 | 1599 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1600 | l2cap_chan_put(chan); |
e90bac06 GP |
1601 | } |
1602 | ||
721c4181 | 1603 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1604 | { |
721c4181 | 1605 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1606 | retrans_timer.work); |
e90bac06 | 1607 | |
49208c9c | 1608 | BT_DBG("chan %p", chan); |
0e98958d | 1609 | |
6be36555 AE |
1610 | l2cap_chan_lock(chan); |
1611 | ||
80909e04 MM |
1612 | if (!chan->conn) { |
1613 | l2cap_chan_unlock(chan); | |
1614 | l2cap_chan_put(chan); | |
1615 | return; | |
1616 | } | |
6be36555 | 1617 | |
401bb1f7 | 1618 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1619 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1620 | l2cap_chan_put(chan); |
e90bac06 GP |
1621 | } |
1622 | ||
d660366d GP |
1623 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1624 | struct sk_buff_head *skbs) | |
6840ed07 | 1625 | { |
ccbb84af | 1626 | struct sk_buff *skb; |
3733937d | 1627 | struct l2cap_ctrl *control; |
6840ed07 | 1628 | |
3733937d MM |
1629 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1630 | ||
3733937d MM |
1631 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1632 | ||
1633 | while (!skb_queue_empty(&chan->tx_q)) { | |
1634 | ||
1635 | skb = skb_dequeue(&chan->tx_q); | |
1636 | ||
1637 | bt_cb(skb)->control.retries = 1; | |
1638 | control = &bt_cb(skb)->control; | |
1639 | ||
1640 | control->reqseq = 0; | |
1641 | control->txseq = chan->next_tx_seq; | |
1642 | ||
1643 | __pack_control(chan, control, skb); | |
6840ed07 | 1644 | |
47d1ec61 | 1645 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1646 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1647 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1648 | } |
1649 | ||
4343478f | 1650 | l2cap_do_send(chan, skb); |
6840ed07 | 1651 | |
3733937d MM |
1652 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1653 | ||
836be934 | 1654 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1655 | chan->frames_sent++; |
6840ed07 | 1656 | } |
6840ed07 GP |
1657 | } |
1658 | ||
67c9e840 | 1659 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1660 | { |
1661 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1662 | struct l2cap_ctrl *control; |
1663 | int sent = 0; | |
1664 | ||
1665 | BT_DBG("chan %p", chan); | |
1c2acffb | 1666 | |
89bc500e | 1667 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1668 | return -ENOTCONN; |
e90bac06 | 1669 | |
94122bbe MM |
1670 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1671 | return 0; | |
1672 | ||
18a48e76 MM |
1673 | while (chan->tx_send_head && |
1674 | chan->unacked_frames < chan->remote_tx_win && | |
1675 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1676 | |
18a48e76 | 1677 | skb = chan->tx_send_head; |
e90bac06 | 1678 | |
18a48e76 MM |
1679 | bt_cb(skb)->control.retries = 1; |
1680 | control = &bt_cb(skb)->control; | |
95ffa978 | 1681 | |
e2ab4353 | 1682 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1683 | control->final = 1; |
e2ab4353 | 1684 | |
18a48e76 MM |
1685 | control->reqseq = chan->buffer_seq; |
1686 | chan->last_acked_seq = chan->buffer_seq; | |
1687 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1688 | |
18a48e76 | 1689 | __pack_control(chan, control, skb); |
e90bac06 | 1690 | |
47d1ec61 | 1691 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1692 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1693 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1694 | } |
1695 | ||
18a48e76 MM |
1696 | /* Clone after data has been modified. Data is assumed to be |
1697 | read-only (for locking purposes) on cloned sk_buffs. | |
1698 | */ | |
1699 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1700 | |
18a48e76 MM |
1701 | if (!tx_skb) |
1702 | break; | |
1c2acffb | 1703 | |
18a48e76 | 1704 | __set_retrans_timer(chan); |
836be934 AE |
1705 | |
1706 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1707 | chan->unacked_frames++; |
6a026610 | 1708 | chan->frames_sent++; |
18a48e76 | 1709 | sent++; |
1c2acffb | 1710 | |
58d35f87 GP |
1711 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1712 | chan->tx_send_head = NULL; | |
1c2acffb | 1713 | else |
58d35f87 | 1714 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1715 | |
1716 | l2cap_do_send(chan, tx_skb); | |
1717 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1718 | } |
1719 | ||
18a48e76 MM |
1720 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1721 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1722 | ||
1723 | return sent; | |
9e917af1 GP |
1724 | } |
1725 | ||
e1fbd4c1 MM |
1726 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1727 | { | |
1728 | struct l2cap_ctrl control; | |
1729 | struct sk_buff *skb; | |
1730 | struct sk_buff *tx_skb; | |
1731 | u16 seq; | |
1732 | ||
1733 | BT_DBG("chan %p", chan); | |
1734 | ||
1735 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1736 | return; | |
1737 | ||
1738 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1739 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1740 | ||
1741 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1742 | if (!skb) { | |
1743 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1744 | seq); | |
1745 | continue; | |
1746 | } | |
1747 | ||
1748 | bt_cb(skb)->control.retries++; | |
1749 | control = bt_cb(skb)->control; | |
1750 | ||
1751 | if (chan->max_tx != 0 && | |
1752 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1753 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1754 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1755 | l2cap_seq_list_clear(&chan->retrans_list); | |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | control.reqseq = chan->buffer_seq; | |
1760 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1761 | control.final = 1; | |
1762 | else | |
1763 | control.final = 0; | |
1764 | ||
1765 | if (skb_cloned(skb)) { | |
1766 | /* Cloned sk_buffs are read-only, so we need a | |
1767 | * writeable copy | |
1768 | */ | |
1769 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1770 | } else { | |
1771 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1772 | } | |
1773 | ||
1774 | if (!tx_skb) { | |
1775 | l2cap_seq_list_clear(&chan->retrans_list); | |
1776 | break; | |
1777 | } | |
1778 | ||
1779 | /* Update skb contents */ | |
1780 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1781 | put_unaligned_le32(__pack_extended_control(&control), | |
1782 | tx_skb->data + L2CAP_HDR_SIZE); | |
1783 | } else { | |
1784 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1785 | tx_skb->data + L2CAP_HDR_SIZE); | |
1786 | } | |
1787 | ||
1788 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1789 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1790 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1791 | L2CAP_FCS_SIZE)); | |
1792 | } | |
1793 | ||
1794 | l2cap_do_send(chan, tx_skb); | |
1795 | ||
1796 | BT_DBG("Resent txseq %d", control.txseq); | |
1797 | ||
1798 | chan->last_acked_seq = chan->buffer_seq; | |
1799 | } | |
1800 | } | |
1801 | ||
f80842a8 MM |
1802 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1803 | struct l2cap_ctrl *control) | |
1804 | { | |
1805 | BT_DBG("chan %p, control %p", chan, control); | |
1806 | ||
1807 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1808 | l2cap_ertm_resend(chan); | |
1809 | } | |
1810 | ||
d2a7ac5d MM |
1811 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1812 | struct l2cap_ctrl *control) | |
1813 | { | |
e1fbd4c1 MM |
1814 | struct sk_buff *skb; |
1815 | ||
1816 | BT_DBG("chan %p, control %p", chan, control); | |
1817 | ||
1818 | if (control->poll) | |
1819 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1820 | ||
1821 | l2cap_seq_list_clear(&chan->retrans_list); | |
1822 | ||
1823 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1824 | return; | |
1825 | ||
1826 | if (chan->unacked_frames) { | |
1827 | skb_queue_walk(&chan->tx_q, skb) { | |
1828 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1829 | skb == chan->tx_send_head) | |
1830 | break; | |
1831 | } | |
1832 | ||
1833 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1834 | if (skb == chan->tx_send_head) | |
1835 | break; | |
1836 | ||
1837 | l2cap_seq_list_append(&chan->retrans_list, | |
1838 | bt_cb(skb)->control.txseq); | |
1839 | } | |
1840 | ||
1841 | l2cap_ertm_resend(chan); | |
1842 | } | |
d2a7ac5d MM |
1843 | } |
1844 | ||
0a0aba42 | 1845 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1846 | { |
0a0aba42 MM |
1847 | struct l2cap_ctrl control; |
1848 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1849 | chan->last_acked_seq); | |
1850 | int threshold; | |
9e917af1 | 1851 | |
0a0aba42 MM |
1852 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1853 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1854 | |
0a0aba42 MM |
1855 | memset(&control, 0, sizeof(control)); |
1856 | control.sframe = 1; | |
dfc909be | 1857 | |
0a0aba42 MM |
1858 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1859 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1860 | __clear_ack_timer(chan); | |
1861 | control.super = L2CAP_SUPER_RNR; | |
1862 | control.reqseq = chan->buffer_seq; | |
1863 | l2cap_send_sframe(chan, &control); | |
1864 | } else { | |
1865 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1866 | l2cap_ertm_send(chan); | |
1867 | /* If any i-frames were sent, they included an ack */ | |
1868 | if (chan->buffer_seq == chan->last_acked_seq) | |
1869 | frames_to_ack = 0; | |
1870 | } | |
dfc909be | 1871 | |
0a0aba42 MM |
1872 | /* Ack now if the tx window is 3/4ths full. |
1873 | * Calculate without mul or div | |
1874 | */ | |
1875 | threshold = chan->tx_win; | |
1876 | threshold += threshold << 1; | |
1877 | threshold >>= 2; | |
1878 | ||
1879 | BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack, | |
1880 | threshold); | |
1881 | ||
1882 | if (frames_to_ack >= threshold) { | |
1883 | __clear_ack_timer(chan); | |
1884 | control.super = L2CAP_SUPER_RR; | |
1885 | control.reqseq = chan->buffer_seq; | |
1886 | l2cap_send_sframe(chan, &control); | |
1887 | frames_to_ack = 0; | |
1888 | } | |
1c2acffb | 1889 | |
0a0aba42 MM |
1890 | if (frames_to_ack) |
1891 | __set_ack_timer(chan); | |
1892 | } | |
b17e73bb SJ |
1893 | } |
1894 | ||
04124681 GP |
1895 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1896 | struct msghdr *msg, int len, | |
1897 | int count, struct sk_buff *skb) | |
1c2acffb | 1898 | { |
0952a57a | 1899 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1900 | struct sk_buff **frag; |
90338947 | 1901 | int sent = 0; |
1da177e4 | 1902 | |
59203a21 | 1903 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1904 | return -EFAULT; |
1da177e4 LT |
1905 | |
1906 | sent += count; | |
1907 | len -= count; | |
1908 | ||
1909 | /* Continuation fragments (no L2CAP header) */ | |
1910 | frag = &skb_shinfo(skb)->frag_list; | |
1911 | while (len) { | |
fbe00700 GP |
1912 | struct sk_buff *tmp; |
1913 | ||
1da177e4 LT |
1914 | count = min_t(unsigned int, conn->mtu, len); |
1915 | ||
fbe00700 GP |
1916 | tmp = chan->ops->alloc_skb(chan, count, |
1917 | msg->msg_flags & MSG_DONTWAIT); | |
1918 | if (IS_ERR(tmp)) | |
1919 | return PTR_ERR(tmp); | |
1920 | ||
1921 | *frag = tmp; | |
2f7719ce | 1922 | |
1c2acffb GP |
1923 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1924 | return -EFAULT; | |
1da177e4 | 1925 | |
5e59b791 LAD |
1926 | (*frag)->priority = skb->priority; |
1927 | ||
1da177e4 LT |
1928 | sent += count; |
1929 | len -= count; | |
1930 | ||
2d0ed3d5 GP |
1931 | skb->len += (*frag)->len; |
1932 | skb->data_len += (*frag)->len; | |
1933 | ||
1da177e4 LT |
1934 | frag = &(*frag)->next; |
1935 | } | |
1da177e4 LT |
1936 | |
1937 | return sent; | |
1c2acffb | 1938 | } |
1da177e4 | 1939 | |
5e59b791 LAD |
1940 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1941 | struct msghdr *msg, size_t len, | |
1942 | u32 priority) | |
1c2acffb | 1943 | { |
8c1d787b | 1944 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1945 | struct sk_buff *skb; |
03a51213 | 1946 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1947 | struct l2cap_hdr *lh; |
1948 | ||
6d5922b0 | 1949 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1950 | |
1951 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1952 | |
1953 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1954 | msg->msg_flags & MSG_DONTWAIT); |
1955 | if (IS_ERR(skb)) | |
1956 | return skb; | |
1c2acffb | 1957 | |
5e59b791 LAD |
1958 | skb->priority = priority; |
1959 | ||
1c2acffb GP |
1960 | /* Create L2CAP header */ |
1961 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1962 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1963 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1964 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1965 | |
0952a57a | 1966 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1967 | if (unlikely(err < 0)) { |
1968 | kfree_skb(skb); | |
1969 | return ERR_PTR(err); | |
1970 | } | |
1971 | return skb; | |
1972 | } | |
1973 | ||
5e59b791 LAD |
1974 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1975 | struct msghdr *msg, size_t len, | |
1976 | u32 priority) | |
1c2acffb | 1977 | { |
8c1d787b | 1978 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1979 | struct sk_buff *skb; |
f2ba7fae | 1980 | int err, count; |
1c2acffb GP |
1981 | struct l2cap_hdr *lh; |
1982 | ||
6d5922b0 | 1983 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1984 | |
f2ba7fae | 1985 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1986 | |
f2ba7fae | 1987 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1988 | msg->msg_flags & MSG_DONTWAIT); |
1989 | if (IS_ERR(skb)) | |
1990 | return skb; | |
1c2acffb | 1991 | |
5e59b791 LAD |
1992 | skb->priority = priority; |
1993 | ||
1c2acffb GP |
1994 | /* Create L2CAP header */ |
1995 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1996 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1997 | lh->len = cpu_to_le16(len); |
1c2acffb | 1998 | |
0952a57a | 1999 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2000 | if (unlikely(err < 0)) { |
2001 | kfree_skb(skb); | |
2002 | return ERR_PTR(err); | |
2003 | } | |
2004 | return skb; | |
2005 | } | |
2006 | ||
ab0ff76d LAD |
2007 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
2008 | struct msghdr *msg, size_t len, | |
94122bbe | 2009 | u16 sdulen) |
1c2acffb | 2010 | { |
8c1d787b | 2011 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2012 | struct sk_buff *skb; |
e4ca6d98 | 2013 | int err, count, hlen; |
1c2acffb GP |
2014 | struct l2cap_hdr *lh; |
2015 | ||
6d5922b0 | 2016 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2017 | |
0ee0d208 GP |
2018 | if (!conn) |
2019 | return ERR_PTR(-ENOTCONN); | |
2020 | ||
e4ca6d98 AE |
2021 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2022 | hlen = L2CAP_EXT_HDR_SIZE; | |
2023 | else | |
2024 | hlen = L2CAP_ENH_HDR_SIZE; | |
2025 | ||
c74e560c | 2026 | if (sdulen) |
03a51213 | 2027 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2028 | |
47d1ec61 | 2029 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2030 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2031 | |
1c2acffb | 2032 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2033 | |
2034 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2035 | msg->msg_flags & MSG_DONTWAIT); |
2036 | if (IS_ERR(skb)) | |
2037 | return skb; | |
1c2acffb GP |
2038 | |
2039 | /* Create L2CAP header */ | |
2040 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2041 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2042 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2043 | |
18a48e76 MM |
2044 | /* Control header is populated later */ |
2045 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2046 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2047 | else | |
2048 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2049 | |
c74e560c | 2050 | if (sdulen) |
03a51213 | 2051 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2052 | |
0952a57a | 2053 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2054 | if (unlikely(err < 0)) { |
2055 | kfree_skb(skb); | |
2056 | return ERR_PTR(err); | |
2057 | } | |
e90bac06 | 2058 | |
18a48e76 | 2059 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2060 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2061 | return skb; |
1da177e4 LT |
2062 | } |
2063 | ||
94122bbe MM |
2064 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2065 | struct sk_buff_head *seg_queue, | |
2066 | struct msghdr *msg, size_t len) | |
c74e560c | 2067 | { |
c74e560c | 2068 | struct sk_buff *skb; |
94122bbe MM |
2069 | u16 sdu_len; |
2070 | size_t pdu_len; | |
2071 | int err = 0; | |
2072 | u8 sar; | |
c74e560c | 2073 | |
94122bbe | 2074 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2075 | |
94122bbe MM |
2076 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2077 | * so fragmented skbs are not used. The HCI layer's handling | |
2078 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2079 | */ | |
c74e560c | 2080 | |
94122bbe MM |
2081 | /* PDU size is derived from the HCI MTU */ |
2082 | pdu_len = chan->conn->mtu; | |
c74e560c | 2083 | |
94122bbe MM |
2084 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2085 | ||
2086 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2087 | if (chan->fcs) |
2088 | pdu_len -= L2CAP_FCS_SIZE; | |
2089 | ||
2090 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2091 | pdu_len -= L2CAP_EXT_HDR_SIZE; | |
2092 | else | |
2093 | pdu_len -= L2CAP_ENH_HDR_SIZE; | |
94122bbe MM |
2094 | |
2095 | /* Remote device may have requested smaller PDUs */ | |
2096 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2097 | ||
2098 | if (len <= pdu_len) { | |
2099 | sar = L2CAP_SAR_UNSEGMENTED; | |
2100 | sdu_len = 0; | |
2101 | pdu_len = len; | |
2102 | } else { | |
2103 | sar = L2CAP_SAR_START; | |
2104 | sdu_len = len; | |
2105 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2106 | } | |
2107 | ||
2108 | while (len > 0) { | |
2109 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2110 | |
c74e560c | 2111 | if (IS_ERR(skb)) { |
94122bbe | 2112 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2113 | return PTR_ERR(skb); |
2114 | } | |
2115 | ||
94122bbe MM |
2116 | bt_cb(skb)->control.sar = sar; |
2117 | __skb_queue_tail(seg_queue, skb); | |
2118 | ||
2119 | len -= pdu_len; | |
2120 | if (sdu_len) { | |
2121 | sdu_len = 0; | |
2122 | pdu_len += L2CAP_SDULEN_SIZE; | |
2123 | } | |
2124 | ||
2125 | if (len <= pdu_len) { | |
2126 | sar = L2CAP_SAR_END; | |
2127 | pdu_len = len; | |
2128 | } else { | |
2129 | sar = L2CAP_SAR_CONTINUE; | |
2130 | } | |
c74e560c | 2131 | } |
c74e560c | 2132 | |
94122bbe | 2133 | return err; |
c74e560c GP |
2134 | } |
2135 | ||
5e59b791 LAD |
2136 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2137 | u32 priority) | |
9a91a04a | 2138 | { |
9a91a04a | 2139 | struct sk_buff *skb; |
9a91a04a | 2140 | int err; |
94122bbe | 2141 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2142 | |
2143 | /* Connectionless channel */ | |
715ec005 | 2144 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2145 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2146 | if (IS_ERR(skb)) |
2147 | return PTR_ERR(skb); | |
2148 | ||
2149 | l2cap_do_send(chan, skb); | |
2150 | return len; | |
2151 | } | |
2152 | ||
2153 | switch (chan->mode) { | |
2154 | case L2CAP_MODE_BASIC: | |
2155 | /* Check outgoing MTU */ | |
2156 | if (len > chan->omtu) | |
2157 | return -EMSGSIZE; | |
2158 | ||
2159 | /* Create a basic PDU */ | |
5e59b791 | 2160 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2161 | if (IS_ERR(skb)) |
2162 | return PTR_ERR(skb); | |
2163 | ||
2164 | l2cap_do_send(chan, skb); | |
2165 | err = len; | |
2166 | break; | |
2167 | ||
2168 | case L2CAP_MODE_ERTM: | |
2169 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2170 | /* Check outgoing MTU */ |
2171 | if (len > chan->omtu) { | |
2172 | err = -EMSGSIZE; | |
2173 | break; | |
2174 | } | |
9a91a04a | 2175 | |
94122bbe | 2176 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2177 | |
94122bbe MM |
2178 | /* Do segmentation before calling in to the state machine, |
2179 | * since it's possible to block while waiting for memory | |
2180 | * allocation. | |
2181 | */ | |
2182 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2183 | |
94122bbe MM |
2184 | /* The channel could have been closed while segmenting, |
2185 | * check that it is still connected. | |
2186 | */ | |
2187 | if (chan->state != BT_CONNECTED) { | |
2188 | __skb_queue_purge(&seg_queue); | |
2189 | err = -ENOTCONN; | |
9a91a04a GP |
2190 | } |
2191 | ||
94122bbe | 2192 | if (err) |
9a91a04a | 2193 | break; |
9a91a04a | 2194 | |
3733937d | 2195 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2196 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2197 | else |
d660366d | 2198 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2199 | |
d660366d | 2200 | err = len; |
9a91a04a | 2201 | |
94122bbe MM |
2202 | /* If the skbs were not queued for sending, they'll still be in |
2203 | * seg_queue and need to be purged. | |
2204 | */ | |
2205 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2206 | break; |
2207 | ||
2208 | default: | |
2209 | BT_DBG("bad state %1.1x", chan->mode); | |
2210 | err = -EBADFD; | |
2211 | } | |
2212 | ||
2213 | return err; | |
2214 | } | |
2215 | ||
d2a7ac5d MM |
2216 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2217 | { | |
bed68bde MM |
2218 | struct l2cap_ctrl control; |
2219 | u16 seq; | |
2220 | ||
2221 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2222 | ||
2223 | memset(&control, 0, sizeof(control)); | |
2224 | control.sframe = 1; | |
2225 | control.super = L2CAP_SUPER_SREJ; | |
2226 | ||
2227 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2228 | seq = __next_seq(chan, seq)) { | |
2229 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2230 | control.reqseq = seq; | |
2231 | l2cap_send_sframe(chan, &control); | |
2232 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2233 | } | |
2234 | } | |
2235 | ||
2236 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2237 | } |
2238 | ||
2239 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2240 | { | |
bed68bde MM |
2241 | struct l2cap_ctrl control; |
2242 | ||
2243 | BT_DBG("chan %p", chan); | |
2244 | ||
2245 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2246 | return; | |
2247 | ||
2248 | memset(&control, 0, sizeof(control)); | |
2249 | control.sframe = 1; | |
2250 | control.super = L2CAP_SUPER_SREJ; | |
2251 | control.reqseq = chan->srej_list.tail; | |
2252 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2253 | } |
2254 | ||
2255 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2256 | { | |
bed68bde MM |
2257 | struct l2cap_ctrl control; |
2258 | u16 initial_head; | |
2259 | u16 seq; | |
2260 | ||
2261 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2262 | ||
2263 | memset(&control, 0, sizeof(control)); | |
2264 | control.sframe = 1; | |
2265 | control.super = L2CAP_SUPER_SREJ; | |
2266 | ||
2267 | /* Capture initial list head to allow only one pass through the list. */ | |
2268 | initial_head = chan->srej_list.head; | |
2269 | ||
2270 | do { | |
2271 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2272 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2273 | break; | |
2274 | ||
2275 | control.reqseq = seq; | |
2276 | l2cap_send_sframe(chan, &control); | |
2277 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2278 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2279 | } |
2280 | ||
608bcc6d MM |
2281 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2282 | { | |
2283 | struct sk_buff *acked_skb; | |
2284 | u16 ackseq; | |
2285 | ||
2286 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2287 | ||
2288 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2289 | return; | |
2290 | ||
2291 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2292 | chan->expected_ack_seq, chan->unacked_frames); | |
2293 | ||
2294 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2295 | ackseq = __next_seq(chan, ackseq)) { | |
2296 | ||
2297 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2298 | if (acked_skb) { | |
2299 | skb_unlink(acked_skb, &chan->tx_q); | |
2300 | kfree_skb(acked_skb); | |
2301 | chan->unacked_frames--; | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | chan->expected_ack_seq = reqseq; | |
2306 | ||
2307 | if (chan->unacked_frames == 0) | |
2308 | __clear_retrans_timer(chan); | |
2309 | ||
2310 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2311 | } | |
2312 | ||
2313 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2314 | { | |
2315 | BT_DBG("chan %p", chan); | |
2316 | ||
2317 | chan->expected_tx_seq = chan->buffer_seq; | |
2318 | l2cap_seq_list_clear(&chan->srej_list); | |
2319 | skb_queue_purge(&chan->srej_q); | |
2320 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2321 | } | |
2322 | ||
d660366d GP |
2323 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2324 | struct l2cap_ctrl *control, | |
2325 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2326 | { |
608bcc6d MM |
2327 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2328 | event); | |
2329 | ||
2330 | switch (event) { | |
2331 | case L2CAP_EV_DATA_REQUEST: | |
2332 | if (chan->tx_send_head == NULL) | |
2333 | chan->tx_send_head = skb_peek(skbs); | |
2334 | ||
2335 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2336 | l2cap_ertm_send(chan); | |
2337 | break; | |
2338 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2339 | BT_DBG("Enter LOCAL_BUSY"); | |
2340 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2341 | ||
2342 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2343 | /* The SREJ_SENT state must be aborted if we are to | |
2344 | * enter the LOCAL_BUSY state. | |
2345 | */ | |
2346 | l2cap_abort_rx_srej_sent(chan); | |
2347 | } | |
2348 | ||
2349 | l2cap_send_ack(chan); | |
2350 | ||
2351 | break; | |
2352 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2353 | BT_DBG("Exit LOCAL_BUSY"); | |
2354 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2355 | ||
2356 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2357 | struct l2cap_ctrl local_control; | |
2358 | ||
2359 | memset(&local_control, 0, sizeof(local_control)); | |
2360 | local_control.sframe = 1; | |
2361 | local_control.super = L2CAP_SUPER_RR; | |
2362 | local_control.poll = 1; | |
2363 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2364 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2365 | |
2366 | chan->retry_count = 1; | |
2367 | __set_monitor_timer(chan); | |
2368 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2369 | } | |
2370 | break; | |
2371 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2372 | l2cap_process_reqseq(chan, control->reqseq); | |
2373 | break; | |
2374 | case L2CAP_EV_EXPLICIT_POLL: | |
2375 | l2cap_send_rr_or_rnr(chan, 1); | |
2376 | chan->retry_count = 1; | |
2377 | __set_monitor_timer(chan); | |
2378 | __clear_ack_timer(chan); | |
2379 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2380 | break; | |
2381 | case L2CAP_EV_RETRANS_TO: | |
2382 | l2cap_send_rr_or_rnr(chan, 1); | |
2383 | chan->retry_count = 1; | |
2384 | __set_monitor_timer(chan); | |
2385 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2386 | break; | |
2387 | case L2CAP_EV_RECV_FBIT: | |
2388 | /* Nothing to process */ | |
2389 | break; | |
2390 | default: | |
2391 | break; | |
2392 | } | |
608bcc6d MM |
2393 | } |
2394 | ||
d660366d GP |
2395 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2396 | struct l2cap_ctrl *control, | |
2397 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2398 | { |
608bcc6d MM |
2399 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2400 | event); | |
2401 | ||
2402 | switch (event) { | |
2403 | case L2CAP_EV_DATA_REQUEST: | |
2404 | if (chan->tx_send_head == NULL) | |
2405 | chan->tx_send_head = skb_peek(skbs); | |
2406 | /* Queue data, but don't send. */ | |
2407 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2408 | break; | |
2409 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2410 | BT_DBG("Enter LOCAL_BUSY"); | |
2411 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2412 | ||
2413 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2414 | /* The SREJ_SENT state must be aborted if we are to | |
2415 | * enter the LOCAL_BUSY state. | |
2416 | */ | |
2417 | l2cap_abort_rx_srej_sent(chan); | |
2418 | } | |
2419 | ||
2420 | l2cap_send_ack(chan); | |
2421 | ||
2422 | break; | |
2423 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2424 | BT_DBG("Exit LOCAL_BUSY"); | |
2425 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2426 | ||
2427 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2428 | struct l2cap_ctrl local_control; | |
2429 | memset(&local_control, 0, sizeof(local_control)); | |
2430 | local_control.sframe = 1; | |
2431 | local_control.super = L2CAP_SUPER_RR; | |
2432 | local_control.poll = 1; | |
2433 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2434 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2435 | |
2436 | chan->retry_count = 1; | |
2437 | __set_monitor_timer(chan); | |
2438 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2439 | } | |
2440 | break; | |
2441 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2442 | l2cap_process_reqseq(chan, control->reqseq); | |
2443 | ||
2444 | /* Fall through */ | |
2445 | ||
2446 | case L2CAP_EV_RECV_FBIT: | |
2447 | if (control && control->final) { | |
2448 | __clear_monitor_timer(chan); | |
2449 | if (chan->unacked_frames > 0) | |
2450 | __set_retrans_timer(chan); | |
2451 | chan->retry_count = 0; | |
2452 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2453 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2454 | } | |
2455 | break; | |
2456 | case L2CAP_EV_EXPLICIT_POLL: | |
2457 | /* Ignore */ | |
2458 | break; | |
2459 | case L2CAP_EV_MONITOR_TO: | |
2460 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2461 | l2cap_send_rr_or_rnr(chan, 1); | |
2462 | __set_monitor_timer(chan); | |
2463 | chan->retry_count++; | |
2464 | } else { | |
2465 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2466 | } | |
2467 | break; | |
2468 | default: | |
2469 | break; | |
2470 | } | |
608bcc6d MM |
2471 | } |
2472 | ||
d660366d GP |
2473 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2474 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2475 | { |
608bcc6d MM |
2476 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2477 | chan, control, skbs, event, chan->tx_state); | |
2478 | ||
2479 | switch (chan->tx_state) { | |
2480 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2481 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2482 | break; |
2483 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2484 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2485 | break; |
2486 | default: | |
2487 | /* Ignore event */ | |
2488 | break; | |
2489 | } | |
608bcc6d MM |
2490 | } |
2491 | ||
4b51dae9 MM |
2492 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2493 | struct l2cap_ctrl *control) | |
2494 | { | |
2495 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2496 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2497 | } |
2498 | ||
f80842a8 MM |
2499 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2500 | struct l2cap_ctrl *control) | |
2501 | { | |
2502 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2503 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2504 | } |
2505 | ||
1da177e4 LT |
2506 | /* Copy frame to all raw sockets on that connection */ |
2507 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2508 | { | |
1da177e4 | 2509 | struct sk_buff *nskb; |
48454079 | 2510 | struct l2cap_chan *chan; |
1da177e4 LT |
2511 | |
2512 | BT_DBG("conn %p", conn); | |
2513 | ||
3df91ea2 | 2514 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2515 | |
3df91ea2 | 2516 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2517 | struct sock *sk = chan->sk; |
715ec005 | 2518 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2519 | continue; |
2520 | ||
2521 | /* Don't send frame to the socket it came from */ | |
2522 | if (skb->sk == sk) | |
2523 | continue; | |
af05b30b GP |
2524 | nskb = skb_clone(skb, GFP_ATOMIC); |
2525 | if (!nskb) | |
1da177e4 LT |
2526 | continue; |
2527 | ||
80b98027 | 2528 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2529 | kfree_skb(nskb); |
2530 | } | |
3d57dc68 | 2531 | |
3df91ea2 | 2532 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2533 | } |
2534 | ||
2535 | /* ---- L2CAP signalling commands ---- */ | |
2536 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2537 | u8 code, u8 ident, u16 dlen, void *data) | |
2538 | { | |
2539 | struct sk_buff *skb, **frag; | |
2540 | struct l2cap_cmd_hdr *cmd; | |
2541 | struct l2cap_hdr *lh; | |
2542 | int len, count; | |
2543 | ||
af05b30b GP |
2544 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2545 | conn, code, ident, dlen); | |
1da177e4 LT |
2546 | |
2547 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2548 | count = min_t(unsigned int, conn->mtu, len); | |
2549 | ||
2550 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2551 | if (!skb) | |
2552 | return NULL; | |
2553 | ||
2554 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2555 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2556 | |
2557 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2558 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2559 | else |
ac73498c | 2560 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2561 | |
2562 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2563 | cmd->code = code; | |
2564 | cmd->ident = ident; | |
aca3192c | 2565 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2566 | |
2567 | if (dlen) { | |
2568 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2569 | memcpy(skb_put(skb, count), data, count); | |
2570 | data += count; | |
2571 | } | |
2572 | ||
2573 | len -= skb->len; | |
2574 | ||
2575 | /* Continuation fragments (no L2CAP header) */ | |
2576 | frag = &skb_shinfo(skb)->frag_list; | |
2577 | while (len) { | |
2578 | count = min_t(unsigned int, conn->mtu, len); | |
2579 | ||
2580 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2581 | if (!*frag) | |
2582 | goto fail; | |
2583 | ||
2584 | memcpy(skb_put(*frag, count), data, count); | |
2585 | ||
2586 | len -= count; | |
2587 | data += count; | |
2588 | ||
2589 | frag = &(*frag)->next; | |
2590 | } | |
2591 | ||
2592 | return skb; | |
2593 | ||
2594 | fail: | |
2595 | kfree_skb(skb); | |
2596 | return NULL; | |
2597 | } | |
2598 | ||
2599 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2600 | { | |
2601 | struct l2cap_conf_opt *opt = *ptr; | |
2602 | int len; | |
2603 | ||
2604 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2605 | *ptr += len; | |
2606 | ||
2607 | *type = opt->type; | |
2608 | *olen = opt->len; | |
2609 | ||
2610 | switch (opt->len) { | |
2611 | case 1: | |
2612 | *val = *((u8 *) opt->val); | |
2613 | break; | |
2614 | ||
2615 | case 2: | |
bfaaeb3e | 2616 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2617 | break; |
2618 | ||
2619 | case 4: | |
bfaaeb3e | 2620 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2621 | break; |
2622 | ||
2623 | default: | |
2624 | *val = (unsigned long) opt->val; | |
2625 | break; | |
2626 | } | |
2627 | ||
2628 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2629 | return len; | |
2630 | } | |
2631 | ||
1da177e4 LT |
2632 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2633 | { | |
2634 | struct l2cap_conf_opt *opt = *ptr; | |
2635 | ||
2636 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2637 | ||
2638 | opt->type = type; | |
2639 | opt->len = len; | |
2640 | ||
2641 | switch (len) { | |
2642 | case 1: | |
2643 | *((u8 *) opt->val) = val; | |
2644 | break; | |
2645 | ||
2646 | case 2: | |
4f8b691c | 2647 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2648 | break; |
2649 | ||
2650 | case 4: | |
4f8b691c | 2651 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2652 | break; |
2653 | ||
2654 | default: | |
2655 | memcpy(opt->val, (void *) val, len); | |
2656 | break; | |
2657 | } | |
2658 | ||
2659 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2660 | } | |
2661 | ||
f89cef09 AE |
2662 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2663 | { | |
2664 | struct l2cap_conf_efs efs; | |
2665 | ||
1ec918ce | 2666 | switch (chan->mode) { |
f89cef09 AE |
2667 | case L2CAP_MODE_ERTM: |
2668 | efs.id = chan->local_id; | |
2669 | efs.stype = chan->local_stype; | |
2670 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2671 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c AE |
2672 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2673 | efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2674 | break; |
2675 | ||
2676 | case L2CAP_MODE_STREAMING: | |
2677 | efs.id = 1; | |
2678 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2679 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2680 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2681 | efs.acc_lat = 0; | |
2682 | efs.flush_to = 0; | |
2683 | break; | |
2684 | ||
2685 | default: | |
2686 | return; | |
2687 | } | |
2688 | ||
2689 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2690 | (unsigned long) &efs); | |
2691 | } | |
2692 | ||
721c4181 | 2693 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2694 | { |
721c4181 | 2695 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2696 | ack_timer.work); |
2697 | u16 frames_to_ack; | |
c1b4f43b | 2698 | |
2fb9b3d4 GP |
2699 | BT_DBG("chan %p", chan); |
2700 | ||
6be36555 AE |
2701 | l2cap_chan_lock(chan); |
2702 | ||
0362520b MM |
2703 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2704 | chan->last_acked_seq); | |
6be36555 | 2705 | |
0362520b MM |
2706 | if (frames_to_ack) |
2707 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2708 | |
0362520b | 2709 | l2cap_chan_unlock(chan); |
09bfb2ee | 2710 | l2cap_chan_put(chan); |
c1b4f43b GP |
2711 | } |
2712 | ||
466f8004 | 2713 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2714 | { |
3c588192 MM |
2715 | int err; |
2716 | ||
105bdf9e MM |
2717 | chan->next_tx_seq = 0; |
2718 | chan->expected_tx_seq = 0; | |
42e5c802 | 2719 | chan->expected_ack_seq = 0; |
6a026610 | 2720 | chan->unacked_frames = 0; |
42e5c802 | 2721 | chan->buffer_seq = 0; |
6a026610 | 2722 | chan->frames_sent = 0; |
105bdf9e MM |
2723 | chan->last_acked_seq = 0; |
2724 | chan->sdu = NULL; | |
2725 | chan->sdu_last_frag = NULL; | |
2726 | chan->sdu_len = 0; | |
2727 | ||
d34c34fb MM |
2728 | skb_queue_head_init(&chan->tx_q); |
2729 | ||
105bdf9e MM |
2730 | if (chan->mode != L2CAP_MODE_ERTM) |
2731 | return 0; | |
2732 | ||
2733 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2734 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2735 | |
721c4181 GP |
2736 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2737 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2738 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2739 | |
f1c6775b | 2740 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2741 | |
3c588192 MM |
2742 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2743 | if (err < 0) | |
2744 | return err; | |
2745 | ||
9dc9affc MM |
2746 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2747 | if (err < 0) | |
2748 | l2cap_seq_list_free(&chan->srej_list); | |
2749 | ||
2750 | return err; | |
0565c1c2 GP |
2751 | } |
2752 | ||
f2fcfcd6 GP |
2753 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2754 | { | |
2755 | switch (mode) { | |
2756 | case L2CAP_MODE_STREAMING: | |
2757 | case L2CAP_MODE_ERTM: | |
2758 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2759 | return mode; | |
2760 | /* fall through */ | |
2761 | default: | |
2762 | return L2CAP_MODE_BASIC; | |
2763 | } | |
2764 | } | |
2765 | ||
6327eb98 AE |
2766 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2767 | { | |
2768 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2769 | } | |
2770 | ||
f89cef09 AE |
2771 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2772 | { | |
2773 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2774 | } | |
2775 | ||
6327eb98 AE |
2776 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2777 | { | |
2778 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2779 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2780 | /* use extended control field */ |
2781 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2782 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2783 | } else { | |
6327eb98 AE |
2784 | chan->tx_win = min_t(u16, chan->tx_win, |
2785 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2786 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2787 | } | |
6327eb98 AE |
2788 | } |
2789 | ||
710f9b0a | 2790 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2791 | { |
1da177e4 | 2792 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2793 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2794 | void *ptr = req->data; |
c8f79162 | 2795 | u16 size; |
1da177e4 | 2796 | |
49208c9c | 2797 | BT_DBG("chan %p", chan); |
1da177e4 | 2798 | |
73ffa904 | 2799 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2800 | goto done; |
2801 | ||
0c1bc5c6 | 2802 | switch (chan->mode) { |
f2fcfcd6 GP |
2803 | case L2CAP_MODE_STREAMING: |
2804 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2805 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2806 | break; |
85eb53c6 | 2807 | |
f89cef09 AE |
2808 | if (__l2cap_efs_supported(chan)) |
2809 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2810 | ||
2ba13ed6 | 2811 | /* fall through */ |
f2fcfcd6 | 2812 | default: |
8c1d787b | 2813 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2814 | break; |
2815 | } | |
2816 | ||
2817 | done: | |
0c1bc5c6 GP |
2818 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2819 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2820 | |
0c1bc5c6 | 2821 | switch (chan->mode) { |
65c7c491 | 2822 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2823 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2824 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2825 | break; |
2826 | ||
62547752 GP |
2827 | rfc.mode = L2CAP_MODE_BASIC; |
2828 | rfc.txwin_size = 0; | |
2829 | rfc.max_transmit = 0; | |
2830 | rfc.retrans_timeout = 0; | |
2831 | rfc.monitor_timeout = 0; | |
2832 | rfc.max_pdu_size = 0; | |
2833 | ||
63406504 GP |
2834 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2835 | (unsigned long) &rfc); | |
65c7c491 MH |
2836 | break; |
2837 | ||
2838 | case L2CAP_MODE_ERTM: | |
2839 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2840 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2841 | rfc.retrans_timeout = 0; |
2842 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2843 | |
2844 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2845 | L2CAP_EXT_HDR_SIZE - | |
2846 | L2CAP_SDULEN_SIZE - | |
2847 | L2CAP_FCS_SIZE); | |
2848 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2849 | |
6327eb98 AE |
2850 | l2cap_txwin_setup(chan); |
2851 | ||
2852 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2853 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2854 | |
63406504 GP |
2855 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2856 | (unsigned long) &rfc); | |
2857 | ||
f89cef09 AE |
2858 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2859 | l2cap_add_opt_efs(&ptr, chan); | |
2860 | ||
8c1d787b | 2861 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2862 | break; |
2863 | ||
47d1ec61 | 2864 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2865 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2866 | chan->fcs = L2CAP_FCS_NONE; |
2867 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2868 | } |
6327eb98 AE |
2869 | |
2870 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2871 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2872 | chan->tx_win); | |
f2fcfcd6 GP |
2873 | break; |
2874 | ||
2875 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2876 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2877 | rfc.mode = L2CAP_MODE_STREAMING; |
2878 | rfc.txwin_size = 0; | |
2879 | rfc.max_transmit = 0; | |
2880 | rfc.retrans_timeout = 0; | |
2881 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2882 | |
2883 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2884 | L2CAP_EXT_HDR_SIZE - | |
2885 | L2CAP_SDULEN_SIZE - | |
2886 | L2CAP_FCS_SIZE); | |
2887 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2888 | |
63406504 GP |
2889 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2890 | (unsigned long) &rfc); | |
2891 | ||
f89cef09 AE |
2892 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2893 | l2cap_add_opt_efs(&ptr, chan); | |
2894 | ||
8c1d787b | 2895 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2896 | break; |
2897 | ||
47d1ec61 | 2898 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2899 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2900 | chan->fcs = L2CAP_FCS_NONE; |
2901 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2902 | } |
65c7c491 MH |
2903 | break; |
2904 | } | |
1da177e4 | 2905 | |
fe4128e0 | 2906 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2907 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2908 | |
2909 | return ptr - data; | |
2910 | } | |
2911 | ||
73ffa904 | 2912 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2913 | { |
5dee9e7c MH |
2914 | struct l2cap_conf_rsp *rsp = data; |
2915 | void *ptr = rsp->data; | |
73ffa904 GP |
2916 | void *req = chan->conf_req; |
2917 | int len = chan->conf_len; | |
5dee9e7c MH |
2918 | int type, hint, olen; |
2919 | unsigned long val; | |
6464f35f | 2920 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2921 | struct l2cap_conf_efs efs; |
2922 | u8 remote_efs = 0; | |
861d6882 | 2923 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2924 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2925 | u16 size; |
1da177e4 | 2926 | |
73ffa904 | 2927 | BT_DBG("chan %p", chan); |
820ae1b8 | 2928 | |
5dee9e7c MH |
2929 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2930 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2931 | |
589d2746 | 2932 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2933 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2934 | |
2935 | switch (type) { | |
2936 | case L2CAP_CONF_MTU: | |
861d6882 | 2937 | mtu = val; |
5dee9e7c MH |
2938 | break; |
2939 | ||
2940 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2941 | chan->flush_to = val; |
5dee9e7c MH |
2942 | break; |
2943 | ||
2944 | case L2CAP_CONF_QOS: | |
2945 | break; | |
2946 | ||
6464f35f MH |
2947 | case L2CAP_CONF_RFC: |
2948 | if (olen == sizeof(rfc)) | |
2949 | memcpy(&rfc, (void *) val, olen); | |
2950 | break; | |
2951 | ||
fcc203c3 GP |
2952 | case L2CAP_CONF_FCS: |
2953 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2954 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2955 | break; |
fcc203c3 | 2956 | |
42dceae2 AE |
2957 | case L2CAP_CONF_EFS: |
2958 | remote_efs = 1; | |
2959 | if (olen == sizeof(efs)) | |
2960 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2961 | break; |
2962 | ||
6327eb98 AE |
2963 | case L2CAP_CONF_EWS: |
2964 | if (!enable_hs) | |
2965 | return -ECONNREFUSED; | |
fcc203c3 | 2966 | |
6327eb98 AE |
2967 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2968 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2969 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2970 | chan->remote_tx_win = val; |
fcc203c3 GP |
2971 | break; |
2972 | ||
5dee9e7c MH |
2973 | default: |
2974 | if (hint) | |
2975 | break; | |
2976 | ||
2977 | result = L2CAP_CONF_UNKNOWN; | |
2978 | *((u8 *) ptr++) = type; | |
2979 | break; | |
2980 | } | |
2981 | } | |
2982 | ||
73ffa904 | 2983 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2984 | goto done; |
2985 | ||
0c1bc5c6 | 2986 | switch (chan->mode) { |
f2fcfcd6 GP |
2987 | case L2CAP_MODE_STREAMING: |
2988 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2989 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2990 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2991 | chan->conn->feat_mask); |
85eb53c6 GP |
2992 | break; |
2993 | } | |
2994 | ||
42dceae2 AE |
2995 | if (remote_efs) { |
2996 | if (__l2cap_efs_supported(chan)) | |
2997 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2998 | else | |
2999 | return -ECONNREFUSED; | |
3000 | } | |
3001 | ||
0c1bc5c6 | 3002 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3003 | return -ECONNREFUSED; |
742e519b | 3004 | |
f2fcfcd6 | 3005 | break; |
f2fcfcd6 GP |
3006 | } |
3007 | ||
3008 | done: | |
0c1bc5c6 | 3009 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3010 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3011 | rfc.mode = chan->mode; |
f2fcfcd6 | 3012 | |
73ffa904 | 3013 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3014 | return -ECONNREFUSED; |
3015 | ||
3016 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3017 | sizeof(rfc), (unsigned long) &rfc); | |
3018 | } | |
3019 | ||
5dee9e7c MH |
3020 | if (result == L2CAP_CONF_SUCCESS) { |
3021 | /* Configure output options and let the other side know | |
3022 | * which ones we don't like. */ | |
3023 | ||
f2fcfcd6 GP |
3024 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3025 | result = L2CAP_CONF_UNACCEPT; | |
3026 | else { | |
0c1bc5c6 | 3027 | chan->omtu = mtu; |
c1360a1c | 3028 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3029 | } |
0c1bc5c6 | 3030 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3031 | |
42dceae2 AE |
3032 | if (remote_efs) { |
3033 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3034 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3035 | efs.stype != chan->local_stype) { | |
3036 | ||
3037 | result = L2CAP_CONF_UNACCEPT; | |
3038 | ||
3039 | if (chan->num_conf_req >= 1) | |
3040 | return -ECONNREFUSED; | |
3041 | ||
3042 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3043 | sizeof(efs), |
42dceae2 | 3044 | (unsigned long) &efs); |
0e8b207e | 3045 | } else { |
3e6b3b95 | 3046 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3047 | result = L2CAP_CONF_PENDING; |
3048 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3049 | } |
3050 | } | |
3051 | ||
f2fcfcd6 GP |
3052 | switch (rfc.mode) { |
3053 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3054 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3055 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3056 | break; |
3057 | ||
3058 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3059 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3060 | chan->remote_tx_win = rfc.txwin_size; | |
3061 | else | |
3062 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3063 | |
2c03a7a4 | 3064 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3065 | |
c8f79162 AE |
3066 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3067 | chan->conn->mtu - | |
3068 | L2CAP_EXT_HDR_SIZE - | |
3069 | L2CAP_SDULEN_SIZE - | |
3070 | L2CAP_FCS_SIZE); | |
3071 | rfc.max_pdu_size = cpu_to_le16(size); | |
3072 | chan->remote_mps = size; | |
f2fcfcd6 | 3073 | |
10467e9e | 3074 | rfc.retrans_timeout = |
4fd21a88 | 3075 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3076 | rfc.monitor_timeout = |
4fd21a88 | 3077 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3078 | |
c1360a1c | 3079 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3080 | |
3081 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3082 | sizeof(rfc), (unsigned long) &rfc); | |
3083 | ||
42dceae2 AE |
3084 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3085 | chan->remote_id = efs.id; | |
3086 | chan->remote_stype = efs.stype; | |
3087 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3088 | chan->remote_flush_to = | |
3089 | le32_to_cpu(efs.flush_to); | |
3090 | chan->remote_acc_lat = | |
3091 | le32_to_cpu(efs.acc_lat); | |
3092 | chan->remote_sdu_itime = | |
3093 | le32_to_cpu(efs.sdu_itime); | |
3094 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3095 | sizeof(efs), (unsigned long) &efs); | |
3096 | } | |
f2fcfcd6 GP |
3097 | break; |
3098 | ||
3099 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3100 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3101 | chan->conn->mtu - | |
3102 | L2CAP_EXT_HDR_SIZE - | |
3103 | L2CAP_SDULEN_SIZE - | |
3104 | L2CAP_FCS_SIZE); | |
3105 | rfc.max_pdu_size = cpu_to_le16(size); | |
3106 | chan->remote_mps = size; | |
f2fcfcd6 | 3107 | |
c1360a1c | 3108 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3109 | |
3110 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3111 | sizeof(rfc), (unsigned long) &rfc); | |
3112 | ||
f2fcfcd6 GP |
3113 | break; |
3114 | ||
3115 | default: | |
5dee9e7c | 3116 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3117 | |
6464f35f | 3118 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3119 | rfc.mode = chan->mode; |
f2fcfcd6 | 3120 | } |
6464f35f | 3121 | |
f2fcfcd6 | 3122 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3123 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3124 | } |
fe4128e0 | 3125 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3126 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3127 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3128 | |
3129 | return ptr - data; | |
1da177e4 LT |
3130 | } |
3131 | ||
b4450035 | 3132 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3133 | { |
f2fcfcd6 GP |
3134 | struct l2cap_conf_req *req = data; |
3135 | void *ptr = req->data; | |
3136 | int type, olen; | |
3137 | unsigned long val; | |
36e999a8 | 3138 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3139 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3140 | |
fe4128e0 | 3141 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3142 | |
3143 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3144 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3145 | ||
3146 | switch (type) { | |
3147 | case L2CAP_CONF_MTU: | |
3148 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3149 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3150 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3151 | } else |
0c1bc5c6 GP |
3152 | chan->imtu = val; |
3153 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3154 | break; |
3155 | ||
3156 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3157 | chan->flush_to = val; |
f2fcfcd6 | 3158 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3159 | 2, chan->flush_to); |
f2fcfcd6 GP |
3160 | break; |
3161 | ||
3162 | case L2CAP_CONF_RFC: | |
3163 | if (olen == sizeof(rfc)) | |
3164 | memcpy(&rfc, (void *)val, olen); | |
3165 | ||
c1360a1c | 3166 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3167 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3168 | return -ECONNREFUSED; |
3169 | ||
47d1ec61 | 3170 | chan->fcs = 0; |
f2fcfcd6 GP |
3171 | |
3172 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3173 | sizeof(rfc), (unsigned long) &rfc); | |
3174 | break; | |
6327eb98 AE |
3175 | |
3176 | case L2CAP_CONF_EWS: | |
3177 | chan->tx_win = min_t(u16, val, | |
3178 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3179 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3180 | chan->tx_win); | |
6327eb98 | 3181 | break; |
66af7aaf AE |
3182 | |
3183 | case L2CAP_CONF_EFS: | |
3184 | if (olen == sizeof(efs)) | |
3185 | memcpy(&efs, (void *)val, olen); | |
3186 | ||
3187 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3188 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3189 | efs.stype != chan->local_stype) | |
3190 | return -ECONNREFUSED; | |
3191 | ||
3192 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3193 | sizeof(efs), (unsigned long) &efs); | |
3194 | break; | |
f2fcfcd6 GP |
3195 | } |
3196 | } | |
3197 | ||
0c1bc5c6 | 3198 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3199 | return -ECONNREFUSED; |
3200 | ||
0c1bc5c6 | 3201 | chan->mode = rfc.mode; |
6c2ea7a8 | 3202 | |
0e8b207e | 3203 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3204 | switch (rfc.mode) { |
3205 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3206 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3207 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3208 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3209 | |
3210 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3211 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3212 | chan->local_sdu_itime = | |
3213 | le32_to_cpu(efs.sdu_itime); | |
3214 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3215 | chan->local_flush_to = | |
3216 | le32_to_cpu(efs.flush_to); | |
3217 | } | |
f2fcfcd6 | 3218 | break; |
66af7aaf | 3219 | |
f2fcfcd6 | 3220 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3221 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3222 | } |
3223 | } | |
3224 | ||
fe4128e0 | 3225 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3226 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3227 | |
3228 | return ptr - data; | |
3229 | } | |
3230 | ||
fe4128e0 | 3231 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3232 | { |
3233 | struct l2cap_conf_rsp *rsp = data; | |
3234 | void *ptr = rsp->data; | |
1da177e4 | 3235 | |
fe4128e0 | 3236 | BT_DBG("chan %p", chan); |
1da177e4 | 3237 | |
fe4128e0 | 3238 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3239 | rsp->result = cpu_to_le16(result); |
aca3192c | 3240 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3241 | |
3242 | return ptr - data; | |
3243 | } | |
3244 | ||
8c1d787b | 3245 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3246 | { |
3247 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3248 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3249 | u8 buf[128]; |
3250 | ||
fe4128e0 GP |
3251 | rsp.scid = cpu_to_le16(chan->dcid); |
3252 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3253 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3254 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3255 | l2cap_send_cmd(conn, chan->ident, |
3256 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3257 | ||
c1360a1c | 3258 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3259 | return; |
3260 | ||
710f9b0a GP |
3261 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3262 | l2cap_build_conf_req(chan, buf), buf); | |
3263 | chan->num_conf_req++; | |
3264 | } | |
3265 | ||
47d1ec61 | 3266 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3267 | { |
7b1c0049 GP |
3268 | int type, olen; |
3269 | unsigned long val; | |
3270 | struct l2cap_conf_rfc rfc; | |
3271 | ||
47d1ec61 | 3272 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3273 | |
0c1bc5c6 | 3274 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3275 | return; |
3276 | ||
3277 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3278 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3279 | ||
3280 | switch (type) { | |
3281 | case L2CAP_CONF_RFC: | |
3282 | if (olen == sizeof(rfc)) | |
3283 | memcpy(&rfc, (void *)val, olen); | |
3284 | goto done; | |
3285 | } | |
3286 | } | |
3287 | ||
36e999a8 MM |
3288 | /* Use sane default values in case a misbehaving remote device |
3289 | * did not send an RFC option. | |
3290 | */ | |
3291 | rfc.mode = chan->mode; | |
ac73498c AE |
3292 | rfc.retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3293 | rfc.monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36e999a8 MM |
3294 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); |
3295 | ||
3296 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3297 | ||
7b1c0049 GP |
3298 | done: |
3299 | switch (rfc.mode) { | |
3300 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3301 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3302 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3303 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3304 | break; |
3305 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3306 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3307 | } |
3308 | } | |
3309 | ||
4e8402a3 MH |
3310 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3311 | { | |
e2fd318e | 3312 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3313 | |
e2fd318e | 3314 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3315 | return 0; |
3316 | ||
3317 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3318 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3319 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3320 | |
3321 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3322 | conn->info_ident = 0; |
984947dc | 3323 | |
4e8402a3 MH |
3324 | l2cap_conn_start(conn); |
3325 | } | |
3326 | ||
3327 | return 0; | |
3328 | } | |
3329 | ||
1da177e4 LT |
3330 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3331 | { | |
1da177e4 LT |
3332 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3333 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3334 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3335 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3336 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3337 | |
3338 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3339 | __le16 psm = req->psm; |
1da177e4 | 3340 | |
097db76c | 3341 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3342 | |
3343 | /* Check if we have socket listening on psm */ | |
c2287681 | 3344 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3345 | if (!pchan) { |
1da177e4 LT |
3346 | result = L2CAP_CR_BAD_PSM; |
3347 | goto sendresp; | |
3348 | } | |
3349 | ||
23691d75 GP |
3350 | parent = pchan->sk; |
3351 | ||
3df91ea2 | 3352 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3353 | lock_sock(parent); |
e0f0cb56 | 3354 | |
e7c29cb1 | 3355 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3356 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3357 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3358 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3359 | result = L2CAP_CR_SEC_BLOCK; |
3360 | goto response; | |
3361 | } | |
3362 | ||
1da177e4 LT |
3363 | result = L2CAP_CR_NO_MEM; |
3364 | ||
2dfa1003 GP |
3365 | /* Check if we already have channel with that dcid */ |
3366 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3367 | goto response; | |
3368 | ||
80b98027 | 3369 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3370 | if (!chan) |
1da177e4 LT |
3371 | goto response; |
3372 | ||
80808e43 GP |
3373 | sk = chan->sk; |
3374 | ||
1da177e4 LT |
3375 | hci_conn_hold(conn->hcon); |
3376 | ||
1da177e4 LT |
3377 | bacpy(&bt_sk(sk)->src, conn->src); |
3378 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3379 | chan->psm = psm; |
3380 | chan->dcid = scid; | |
1da177e4 | 3381 | |
d1010240 GP |
3382 | bt_accept_enqueue(parent, sk); |
3383 | ||
6be36555 | 3384 | __l2cap_chan_add(conn, chan); |
48454079 | 3385 | |
fe4128e0 | 3386 | dcid = chan->scid; |
1da177e4 | 3387 | |
c9b66675 | 3388 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3389 | |
fc7f8a7e | 3390 | chan->ident = cmd->ident; |
1da177e4 | 3391 | |
984947dc | 3392 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3393 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3394 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3395 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3396 | result = L2CAP_CR_PEND; |
3397 | status = L2CAP_CS_AUTHOR_PEND; | |
3398 | parent->sk_data_ready(parent, 0); | |
3399 | } else { | |
0e587be7 | 3400 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3401 | result = L2CAP_CR_SUCCESS; |
3402 | status = L2CAP_CS_NO_INFO; | |
3403 | } | |
79d554a6 | 3404 | } else { |
0e587be7 | 3405 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3406 | result = L2CAP_CR_PEND; |
3407 | status = L2CAP_CS_AUTHEN_PEND; | |
3408 | } | |
3409 | } else { | |
0e587be7 | 3410 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3411 | result = L2CAP_CR_PEND; |
3412 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3413 | } |
3414 | ||
1da177e4 | 3415 | response: |
aa2ac881 | 3416 | release_sock(parent); |
3df91ea2 | 3417 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3418 | |
3419 | sendresp: | |
aca3192c YH |
3420 | rsp.scid = cpu_to_le16(scid); |
3421 | rsp.dcid = cpu_to_le16(dcid); | |
3422 | rsp.result = cpu_to_le16(result); | |
3423 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3424 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3425 | |
3426 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3427 | struct l2cap_info_req info; | |
ac73498c | 3428 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3429 | |
3430 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3431 | conn->info_ident = l2cap_get_ident(conn); | |
3432 | ||
ba13ccd9 | 3433 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3434 | |
3435 | l2cap_send_cmd(conn, conn->info_ident, | |
3436 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3437 | } | |
3438 | ||
c1360a1c | 3439 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3440 | result == L2CAP_CR_SUCCESS) { |
3441 | u8 buf[128]; | |
c1360a1c | 3442 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3443 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3444 | l2cap_build_conf_req(chan, buf), buf); |
3445 | chan->num_conf_req++; | |
e9aeb2dd GP |
3446 | } |
3447 | ||
1da177e4 LT |
3448 | return 0; |
3449 | } | |
3450 | ||
3451 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3452 | { | |
3453 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3454 | u16 scid, dcid, result, status; | |
48454079 | 3455 | struct l2cap_chan *chan; |
1da177e4 | 3456 | u8 req[128]; |
3df91ea2 | 3457 | int err; |
1da177e4 LT |
3458 | |
3459 | scid = __le16_to_cpu(rsp->scid); | |
3460 | dcid = __le16_to_cpu(rsp->dcid); | |
3461 | result = __le16_to_cpu(rsp->result); | |
3462 | status = __le16_to_cpu(rsp->status); | |
3463 | ||
1b009c98 AE |
3464 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3465 | dcid, scid, result, status); | |
1da177e4 | 3466 | |
3df91ea2 AE |
3467 | mutex_lock(&conn->chan_lock); |
3468 | ||
1da177e4 | 3469 | if (scid) { |
3df91ea2 AE |
3470 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3471 | if (!chan) { | |
3472 | err = -EFAULT; | |
3473 | goto unlock; | |
3474 | } | |
1da177e4 | 3475 | } else { |
3df91ea2 AE |
3476 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3477 | if (!chan) { | |
3478 | err = -EFAULT; | |
3479 | goto unlock; | |
3480 | } | |
1da177e4 LT |
3481 | } |
3482 | ||
3df91ea2 AE |
3483 | err = 0; |
3484 | ||
6be36555 | 3485 | l2cap_chan_lock(chan); |
48454079 | 3486 | |
1da177e4 LT |
3487 | switch (result) { |
3488 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3489 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3490 | chan->ident = 0; |
fe4128e0 | 3491 | chan->dcid = dcid; |
c1360a1c | 3492 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3493 | |
c1360a1c | 3494 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3495 | break; |
3496 | ||
1da177e4 | 3497 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3498 | l2cap_build_conf_req(chan, req), req); |
3499 | chan->num_conf_req++; | |
1da177e4 LT |
3500 | break; |
3501 | ||
3502 | case L2CAP_CR_PEND: | |
c1360a1c | 3503 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3504 | break; |
3505 | ||
3506 | default: | |
48454079 | 3507 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3508 | break; |
3509 | } | |
3510 | ||
6be36555 | 3511 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3512 | |
3513 | unlock: | |
3514 | mutex_unlock(&conn->chan_lock); | |
3515 | ||
3516 | return err; | |
1da177e4 LT |
3517 | } |
3518 | ||
47d1ec61 | 3519 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3520 | { |
3521 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3522 | * sides request it. | |
3523 | */ | |
0c1bc5c6 | 3524 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3525 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3526 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3527 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3528 | } |
3529 | ||
88219a0f | 3530 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3531 | { |
3532 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3533 | u16 dcid, flags; | |
3534 | u8 rsp[64]; | |
48454079 | 3535 | struct l2cap_chan *chan; |
3c588192 | 3536 | int len, err = 0; |
1da177e4 LT |
3537 | |
3538 | dcid = __le16_to_cpu(req->dcid); | |
3539 | flags = __le16_to_cpu(req->flags); | |
3540 | ||
3541 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3542 | ||
baa7e1fa | 3543 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3544 | if (!chan) |
1da177e4 LT |
3545 | return -ENOENT; |
3546 | ||
033b1142 | 3547 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3548 | struct l2cap_cmd_rej_cid rej; |
3549 | ||
ac73498c | 3550 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3551 | rej.scid = cpu_to_le16(chan->scid); |
3552 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3553 | |
df6bd743 GP |
3554 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3555 | sizeof(rej), &rej); | |
354f60a9 | 3556 | goto unlock; |
df6bd743 | 3557 | } |
354f60a9 | 3558 | |
5dee9e7c | 3559 | /* Reject if config buffer is too small. */ |
88219a0f | 3560 | len = cmd_len - sizeof(*req); |
7ac28817 | 3561 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3562 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3563 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3564 | L2CAP_CONF_REJECT, flags), rsp); |
3565 | goto unlock; | |
3566 | } | |
3567 | ||
3568 | /* Store config. */ | |
73ffa904 GP |
3569 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3570 | chan->conf_len += len; | |
1da177e4 | 3571 | |
59e54bd1 | 3572 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3573 | /* Incomplete config. Send empty response. */ |
3574 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3575 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3576 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3577 | goto unlock; |
3578 | } | |
3579 | ||
3580 | /* Complete config. */ | |
73ffa904 | 3581 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3582 | if (len < 0) { |
e92c8e70 | 3583 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3584 | goto unlock; |
f2fcfcd6 | 3585 | } |
1da177e4 | 3586 | |
5dee9e7c | 3587 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3588 | chan->num_conf_rsp++; |
5dee9e7c | 3589 | |
5dee9e7c | 3590 | /* Reset config buffer. */ |
73ffa904 | 3591 | chan->conf_len = 0; |
5dee9e7c | 3592 | |
c1360a1c | 3593 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3594 | goto unlock; |
3595 | ||
c1360a1c | 3596 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3597 | set_default_fcs(chan); |
fcc203c3 | 3598 | |
105bdf9e MM |
3599 | if (chan->mode == L2CAP_MODE_ERTM || |
3600 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3601 | err = l2cap_ertm_init(chan); |
3602 | ||
3603 | if (err < 0) | |
3604 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3605 | else | |
3606 | l2cap_chan_ready(chan); | |
0565c1c2 | 3607 | |
876d9484 MH |
3608 | goto unlock; |
3609 | } | |
3610 | ||
c1360a1c | 3611 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3612 | u8 buf[64]; |
1da177e4 | 3613 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3614 | l2cap_build_conf_req(chan, buf), buf); |
3615 | chan->num_conf_req++; | |
1da177e4 LT |
3616 | } |
3617 | ||
0e8b207e AE |
3618 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3619 | Conf Rsp PENDING in the code above */ | |
3620 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3621 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3622 | ||
3623 | /* check compatibility */ | |
3624 | ||
3625 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3626 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3627 | ||
3628 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3629 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3630 | L2CAP_CONF_SUCCESS, flags), rsp); |
0e8b207e AE |
3631 | } |
3632 | ||
1da177e4 | 3633 | unlock: |
6be36555 | 3634 | l2cap_chan_unlock(chan); |
3c588192 | 3635 | return err; |
1da177e4 LT |
3636 | } |
3637 | ||
3638 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3639 | { | |
3640 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3641 | u16 scid, flags, result; | |
48454079 | 3642 | struct l2cap_chan *chan; |
61386cba | 3643 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3644 | int err = 0; |
1da177e4 LT |
3645 | |
3646 | scid = __le16_to_cpu(rsp->scid); | |
3647 | flags = __le16_to_cpu(rsp->flags); | |
3648 | result = __le16_to_cpu(rsp->result); | |
3649 | ||
61386cba AE |
3650 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3651 | result, len); | |
1da177e4 | 3652 | |
baa7e1fa | 3653 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3654 | if (!chan) |
1da177e4 LT |
3655 | return 0; |
3656 | ||
3657 | switch (result) { | |
3658 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3659 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3660 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3661 | break; |
3662 | ||
0e8b207e AE |
3663 | case L2CAP_CONF_PENDING: |
3664 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3665 | ||
3666 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3667 | char buf[64]; | |
3668 | ||
3669 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3670 | buf, &result); | |
3671 | if (len < 0) { | |
3672 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3673 | goto done; | |
3674 | } | |
3675 | ||
3676 | /* check compatibility */ | |
3677 | ||
3678 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3679 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3680 | ||
3681 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3682 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3683 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3684 | } | |
3685 | goto done; | |
3686 | ||
1da177e4 | 3687 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3688 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3689 | char req[64]; |
3690 | ||
c2c77ec8 | 3691 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3692 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3693 | goto done; |
3694 | } | |
3695 | ||
f2fcfcd6 GP |
3696 | /* throw out any old stored conf requests */ |
3697 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3698 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3699 | req, &result); | |
f2fcfcd6 | 3700 | if (len < 0) { |
e92c8e70 | 3701 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3702 | goto done; |
3703 | } | |
3704 | ||
3705 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3706 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3707 | chan->num_conf_req++; |
f2fcfcd6 GP |
3708 | if (result != L2CAP_CONF_SUCCESS) |
3709 | goto done; | |
3710 | break; | |
1da177e4 LT |
3711 | } |
3712 | ||
8e87d142 | 3713 | default: |
6be36555 | 3714 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3715 | |
ba13ccd9 | 3716 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3717 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3718 | goto done; |
3719 | } | |
3720 | ||
59e54bd1 | 3721 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3722 | goto done; |
3723 | ||
c1360a1c | 3724 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3725 | |
c1360a1c | 3726 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3727 | set_default_fcs(chan); |
fcc203c3 | 3728 | |
105bdf9e MM |
3729 | if (chan->mode == L2CAP_MODE_ERTM || |
3730 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3731 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3732 | |
3c588192 MM |
3733 | if (err < 0) |
3734 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3735 | else | |
3736 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3737 | } |
3738 | ||
3739 | done: | |
6be36555 | 3740 | l2cap_chan_unlock(chan); |
3c588192 | 3741 | return err; |
1da177e4 LT |
3742 | } |
3743 | ||
3744 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3745 | { | |
3746 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3747 | struct l2cap_disconn_rsp rsp; | |
3748 | u16 dcid, scid; | |
48454079 | 3749 | struct l2cap_chan *chan; |
1da177e4 LT |
3750 | struct sock *sk; |
3751 | ||
3752 | scid = __le16_to_cpu(req->scid); | |
3753 | dcid = __le16_to_cpu(req->dcid); | |
3754 | ||
3755 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3756 | ||
3df91ea2 AE |
3757 | mutex_lock(&conn->chan_lock); |
3758 | ||
3759 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3760 | if (!chan) { | |
3761 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3762 | return 0; |
3df91ea2 | 3763 | } |
1da177e4 | 3764 | |
6be36555 AE |
3765 | l2cap_chan_lock(chan); |
3766 | ||
48454079 GP |
3767 | sk = chan->sk; |
3768 | ||
fe4128e0 GP |
3769 | rsp.dcid = cpu_to_le16(chan->scid); |
3770 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3771 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3772 | ||
6be36555 | 3773 | lock_sock(sk); |
1da177e4 | 3774 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3775 | release_sock(sk); |
1da177e4 | 3776 | |
61d6ef3e | 3777 | l2cap_chan_hold(chan); |
48454079 | 3778 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3779 | |
3780 | l2cap_chan_unlock(chan); | |
1da177e4 | 3781 | |
80b98027 | 3782 | chan->ops->close(chan); |
61d6ef3e | 3783 | l2cap_chan_put(chan); |
3df91ea2 AE |
3784 | |
3785 | mutex_unlock(&conn->chan_lock); | |
3786 | ||
1da177e4 LT |
3787 | return 0; |
3788 | } | |
3789 | ||
3790 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3791 | { | |
3792 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3793 | u16 dcid, scid; | |
48454079 | 3794 | struct l2cap_chan *chan; |
1da177e4 LT |
3795 | |
3796 | scid = __le16_to_cpu(rsp->scid); | |
3797 | dcid = __le16_to_cpu(rsp->dcid); | |
3798 | ||
3799 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3800 | ||
3df91ea2 AE |
3801 | mutex_lock(&conn->chan_lock); |
3802 | ||
3803 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3804 | if (!chan) { | |
3805 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3806 | return 0; |
3df91ea2 | 3807 | } |
1da177e4 | 3808 | |
6be36555 | 3809 | l2cap_chan_lock(chan); |
48454079 | 3810 | |
61d6ef3e | 3811 | l2cap_chan_hold(chan); |
48454079 | 3812 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3813 | |
3814 | l2cap_chan_unlock(chan); | |
1da177e4 | 3815 | |
80b98027 | 3816 | chan->ops->close(chan); |
61d6ef3e | 3817 | l2cap_chan_put(chan); |
3df91ea2 AE |
3818 | |
3819 | mutex_unlock(&conn->chan_lock); | |
3820 | ||
1da177e4 LT |
3821 | return 0; |
3822 | } | |
3823 | ||
3824 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3825 | { | |
3826 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3827 | u16 type; |
3828 | ||
3829 | type = __le16_to_cpu(req->type); | |
3830 | ||
3831 | BT_DBG("type 0x%4.4x", type); | |
3832 | ||
f0709e03 MH |
3833 | if (type == L2CAP_IT_FEAT_MASK) { |
3834 | u8 buf[8]; | |
44dd46de | 3835 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3836 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3837 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3838 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3839 | if (!disable_ertm) |
fcc203c3 GP |
3840 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3841 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3842 | if (enable_hs) |
6327eb98 AE |
3843 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3844 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3845 | |
1b7bf4ed | 3846 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3847 | l2cap_send_cmd(conn, cmd->ident, |
3848 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3849 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3850 | u8 buf[12]; | |
3851 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3852 | |
3853 | if (enable_hs) | |
3854 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3855 | else | |
3856 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3857 | ||
ac73498c AE |
3858 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3859 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3860 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3861 | l2cap_send_cmd(conn, cmd->ident, |
3862 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3863 | } else { |
3864 | struct l2cap_info_rsp rsp; | |
3865 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3866 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3867 | l2cap_send_cmd(conn, cmd->ident, |
3868 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3869 | } | |
1da177e4 LT |
3870 | |
3871 | return 0; | |
3872 | } | |
3873 | ||
3874 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3875 | { | |
3876 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3877 | u16 type, result; | |
3878 | ||
3879 | type = __le16_to_cpu(rsp->type); | |
3880 | result = __le16_to_cpu(rsp->result); | |
3881 | ||
3882 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3883 | ||
e90165be AE |
3884 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3885 | if (cmd->ident != conn->info_ident || | |
3886 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3887 | return 0; | |
3888 | ||
17cd3f37 | 3889 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3890 | |
adb08ede VT |
3891 | if (result != L2CAP_IR_SUCCESS) { |
3892 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3893 | conn->info_ident = 0; | |
3894 | ||
3895 | l2cap_conn_start(conn); | |
3896 | ||
3897 | return 0; | |
3898 | } | |
3899 | ||
978c93b9 AE |
3900 | switch (type) { |
3901 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3902 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3903 | |
47ec1dcd | 3904 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3905 | struct l2cap_info_req req; |
ac73498c | 3906 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3907 | |
3908 | conn->info_ident = l2cap_get_ident(conn); | |
3909 | ||
3910 | l2cap_send_cmd(conn, conn->info_ident, | |
3911 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3912 | } else { | |
3913 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3914 | conn->info_ident = 0; | |
3915 | ||
3916 | l2cap_conn_start(conn); | |
3917 | } | |
978c93b9 AE |
3918 | break; |
3919 | ||
3920 | case L2CAP_IT_FIXED_CHAN: | |
3921 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3922 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3923 | conn->info_ident = 0; |
984947dc MH |
3924 | |
3925 | l2cap_conn_start(conn); | |
978c93b9 | 3926 | break; |
984947dc | 3927 | } |
4e8402a3 | 3928 | |
1da177e4 LT |
3929 | return 0; |
3930 | } | |
3931 | ||
f94ff6ff MM |
3932 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3933 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3934 | void *data) | |
3935 | { | |
3936 | struct l2cap_create_chan_req *req = data; | |
3937 | struct l2cap_create_chan_rsp rsp; | |
3938 | u16 psm, scid; | |
3939 | ||
3940 | if (cmd_len != sizeof(*req)) | |
3941 | return -EPROTO; | |
3942 | ||
3943 | if (!enable_hs) | |
3944 | return -EINVAL; | |
3945 | ||
3946 | psm = le16_to_cpu(req->psm); | |
3947 | scid = le16_to_cpu(req->scid); | |
3948 | ||
3949 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3950 | ||
3951 | /* Placeholder: Always reject */ | |
3952 | rsp.dcid = 0; | |
3953 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3954 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3955 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3956 | |
3957 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3958 | sizeof(rsp), &rsp); | |
3959 | ||
3960 | return 0; | |
3961 | } | |
3962 | ||
3963 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3964 | struct l2cap_cmd_hdr *cmd, void *data) | |
3965 | { | |
3966 | BT_DBG("conn %p", conn); | |
3967 | ||
3968 | return l2cap_connect_rsp(conn, cmd, data); | |
3969 | } | |
3970 | ||
8d5a04a1 MM |
3971 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3972 | u16 icid, u16 result) | |
3973 | { | |
3974 | struct l2cap_move_chan_rsp rsp; | |
3975 | ||
3976 | BT_DBG("icid %d, result %d", icid, result); | |
3977 | ||
3978 | rsp.icid = cpu_to_le16(icid); | |
3979 | rsp.result = cpu_to_le16(result); | |
3980 | ||
3981 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3982 | } | |
3983 | ||
3984 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3985 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3986 | { | |
3987 | struct l2cap_move_chan_cfm cfm; | |
3988 | u8 ident; | |
3989 | ||
3990 | BT_DBG("icid %d, result %d", icid, result); | |
3991 | ||
3992 | ident = l2cap_get_ident(conn); | |
3993 | if (chan) | |
3994 | chan->ident = ident; | |
3995 | ||
3996 | cfm.icid = cpu_to_le16(icid); | |
3997 | cfm.result = cpu_to_le16(result); | |
3998 | ||
3999 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4000 | } | |
4001 | ||
4002 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
4003 | u16 icid) | |
4004 | { | |
4005 | struct l2cap_move_chan_cfm_rsp rsp; | |
4006 | ||
4007 | BT_DBG("icid %d", icid); | |
4008 | ||
4009 | rsp.icid = cpu_to_le16(icid); | |
4010 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4011 | } | |
4012 | ||
4013 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
4014 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4015 | { | |
4016 | struct l2cap_move_chan_req *req = data; | |
4017 | u16 icid = 0; | |
4018 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4019 | ||
4020 | if (cmd_len != sizeof(*req)) | |
4021 | return -EPROTO; | |
4022 | ||
4023 | icid = le16_to_cpu(req->icid); | |
4024 | ||
4025 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
4026 | ||
4027 | if (!enable_hs) | |
4028 | return -EINVAL; | |
4029 | ||
4030 | /* Placeholder: Always refuse */ | |
4031 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4032 | ||
4033 | return 0; | |
4034 | } | |
4035 | ||
4036 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
4037 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4038 | { | |
4039 | struct l2cap_move_chan_rsp *rsp = data; | |
4040 | u16 icid, result; | |
4041 | ||
4042 | if (cmd_len != sizeof(*rsp)) | |
4043 | return -EPROTO; | |
4044 | ||
4045 | icid = le16_to_cpu(rsp->icid); | |
4046 | result = le16_to_cpu(rsp->result); | |
4047 | ||
4048 | BT_DBG("icid %d, result %d", icid, result); | |
4049 | ||
4050 | /* Placeholder: Always unconfirmed */ | |
4051 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4052 | ||
4053 | return 0; | |
4054 | } | |
4055 | ||
4056 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
4057 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4058 | { | |
4059 | struct l2cap_move_chan_cfm *cfm = data; | |
4060 | u16 icid, result; | |
4061 | ||
4062 | if (cmd_len != sizeof(*cfm)) | |
4063 | return -EPROTO; | |
4064 | ||
4065 | icid = le16_to_cpu(cfm->icid); | |
4066 | result = le16_to_cpu(cfm->result); | |
4067 | ||
4068 | BT_DBG("icid %d, result %d", icid, result); | |
4069 | ||
4070 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4071 | ||
4072 | return 0; | |
4073 | } | |
4074 | ||
4075 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
4076 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4077 | { | |
4078 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4079 | u16 icid; | |
4080 | ||
4081 | if (cmd_len != sizeof(*rsp)) | |
4082 | return -EPROTO; | |
4083 | ||
4084 | icid = le16_to_cpu(rsp->icid); | |
4085 | ||
4086 | BT_DBG("icid %d", icid); | |
4087 | ||
4088 | return 0; | |
4089 | } | |
4090 | ||
e2174ca4 | 4091 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4092 | u16 to_multiplier) |
4093 | { | |
4094 | u16 max_latency; | |
4095 | ||
4096 | if (min > max || min < 6 || max > 3200) | |
4097 | return -EINVAL; | |
4098 | ||
4099 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4100 | return -EINVAL; | |
4101 | ||
4102 | if (max >= to_multiplier * 8) | |
4103 | return -EINVAL; | |
4104 | ||
4105 | max_latency = (to_multiplier * 8 / max) - 1; | |
4106 | if (latency > 499 || latency > max_latency) | |
4107 | return -EINVAL; | |
4108 | ||
4109 | return 0; | |
4110 | } | |
4111 | ||
4112 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4113 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4114 | { | |
4115 | struct hci_conn *hcon = conn->hcon; | |
4116 | struct l2cap_conn_param_update_req *req; | |
4117 | struct l2cap_conn_param_update_rsp rsp; | |
4118 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4119 | int err; |
de73115a CT |
4120 | |
4121 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4122 | return -EINVAL; | |
4123 | ||
4124 | cmd_len = __le16_to_cpu(cmd->len); | |
4125 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4126 | return -EPROTO; | |
4127 | ||
4128 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4129 | min = __le16_to_cpu(req->min); |
4130 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4131 | latency = __le16_to_cpu(req->latency); |
4132 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4133 | ||
4134 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4135 | min, max, latency, to_multiplier); | |
4136 | ||
4137 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4138 | |
4139 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4140 | if (err) | |
ac73498c | 4141 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4142 | else |
ac73498c | 4143 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4144 | |
4145 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4146 | sizeof(rsp), &rsp); | |
4147 | ||
2ce603eb CT |
4148 | if (!err) |
4149 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4150 | ||
de73115a CT |
4151 | return 0; |
4152 | } | |
4153 | ||
3300d9a9 CT |
4154 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4155 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4156 | { | |
4157 | int err = 0; | |
4158 | ||
4159 | switch (cmd->code) { | |
4160 | case L2CAP_COMMAND_REJ: | |
4161 | l2cap_command_rej(conn, cmd, data); | |
4162 | break; | |
4163 | ||
4164 | case L2CAP_CONN_REQ: | |
4165 | err = l2cap_connect_req(conn, cmd, data); | |
4166 | break; | |
4167 | ||
4168 | case L2CAP_CONN_RSP: | |
4169 | err = l2cap_connect_rsp(conn, cmd, data); | |
4170 | break; | |
4171 | ||
4172 | case L2CAP_CONF_REQ: | |
4173 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4174 | break; | |
4175 | ||
4176 | case L2CAP_CONF_RSP: | |
4177 | err = l2cap_config_rsp(conn, cmd, data); | |
4178 | break; | |
4179 | ||
4180 | case L2CAP_DISCONN_REQ: | |
4181 | err = l2cap_disconnect_req(conn, cmd, data); | |
4182 | break; | |
4183 | ||
4184 | case L2CAP_DISCONN_RSP: | |
4185 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4186 | break; | |
4187 | ||
4188 | case L2CAP_ECHO_REQ: | |
4189 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4190 | break; | |
4191 | ||
4192 | case L2CAP_ECHO_RSP: | |
4193 | break; | |
4194 | ||
4195 | case L2CAP_INFO_REQ: | |
4196 | err = l2cap_information_req(conn, cmd, data); | |
4197 | break; | |
4198 | ||
4199 | case L2CAP_INFO_RSP: | |
4200 | err = l2cap_information_rsp(conn, cmd, data); | |
4201 | break; | |
4202 | ||
f94ff6ff MM |
4203 | case L2CAP_CREATE_CHAN_REQ: |
4204 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4205 | break; | |
4206 | ||
4207 | case L2CAP_CREATE_CHAN_RSP: | |
4208 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4209 | break; | |
4210 | ||
8d5a04a1 MM |
4211 | case L2CAP_MOVE_CHAN_REQ: |
4212 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4213 | break; | |
4214 | ||
4215 | case L2CAP_MOVE_CHAN_RSP: | |
4216 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4217 | break; | |
4218 | ||
4219 | case L2CAP_MOVE_CHAN_CFM: | |
4220 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4221 | break; | |
4222 | ||
4223 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4224 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4225 | break; | |
4226 | ||
3300d9a9 CT |
4227 | default: |
4228 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4229 | err = -EINVAL; | |
4230 | break; | |
4231 | } | |
4232 | ||
4233 | return err; | |
4234 | } | |
4235 | ||
4236 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4237 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4238 | { | |
4239 | switch (cmd->code) { | |
4240 | case L2CAP_COMMAND_REJ: | |
4241 | return 0; | |
4242 | ||
4243 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4244 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4245 | |
4246 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4247 | return 0; | |
4248 | ||
4249 | default: | |
4250 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4251 | return -EINVAL; | |
4252 | } | |
4253 | } | |
4254 | ||
4255 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4256 | struct sk_buff *skb) | |
1da177e4 LT |
4257 | { |
4258 | u8 *data = skb->data; | |
4259 | int len = skb->len; | |
4260 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4261 | int err; |
1da177e4 LT |
4262 | |
4263 | l2cap_raw_recv(conn, skb); | |
4264 | ||
4265 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4266 | u16 cmd_len; |
1da177e4 LT |
4267 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4268 | data += L2CAP_CMD_HDR_SIZE; | |
4269 | len -= L2CAP_CMD_HDR_SIZE; | |
4270 | ||
88219a0f | 4271 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4272 | |
88219a0f | 4273 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4274 | |
88219a0f | 4275 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4276 | BT_DBG("corrupted command"); |
4277 | break; | |
4278 | } | |
4279 | ||
3300d9a9 CT |
4280 | if (conn->hcon->type == LE_LINK) |
4281 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4282 | else | |
4283 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4284 | |
4285 | if (err) { | |
e2fd318e | 4286 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4287 | |
4288 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4289 | |
4290 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4291 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4292 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4293 | } | |
4294 | ||
88219a0f AV |
4295 | data += cmd_len; |
4296 | len -= cmd_len; | |
1da177e4 LT |
4297 | } |
4298 | ||
4299 | kfree_skb(skb); | |
4300 | } | |
4301 | ||
47d1ec61 | 4302 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4303 | { |
4304 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4305 | int hdr_size; |
4306 | ||
4307 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4308 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4309 | else | |
4310 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4311 | |
47d1ec61 | 4312 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4313 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4314 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4315 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4316 | ||
4317 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4318 | return -EBADMSG; |
fcc203c3 GP |
4319 | } |
4320 | return 0; | |
4321 | } | |
4322 | ||
6ea00485 | 4323 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4324 | { |
e31f7633 | 4325 | struct l2cap_ctrl control; |
d5392c8f | 4326 | |
e31f7633 | 4327 | BT_DBG("chan %p", chan); |
d5392c8f | 4328 | |
e31f7633 MM |
4329 | memset(&control, 0, sizeof(control)); |
4330 | control.sframe = 1; | |
4331 | control.final = 1; | |
4332 | control.reqseq = chan->buffer_seq; | |
4333 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4334 | |
e2ab4353 | 4335 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4336 | control.super = L2CAP_SUPER_RNR; |
4337 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4338 | } |
4339 | ||
e31f7633 MM |
4340 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4341 | chan->unacked_frames > 0) | |
4342 | __set_retrans_timer(chan); | |
d5392c8f | 4343 | |
e31f7633 | 4344 | /* Send pending iframes */ |
525cd185 | 4345 | l2cap_ertm_send(chan); |
d5392c8f | 4346 | |
e2ab4353 | 4347 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4348 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4349 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4350 | * send it now. | |
4351 | */ | |
4352 | control.super = L2CAP_SUPER_RR; | |
4353 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4354 | } |
4355 | } | |
4356 | ||
84084a31 MM |
4357 | static void append_skb_frag(struct sk_buff *skb, |
4358 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4359 | { |
84084a31 MM |
4360 | /* skb->len reflects data in skb as well as all fragments |
4361 | * skb->data_len reflects only data in fragments | |
4362 | */ | |
4363 | if (!skb_has_frag_list(skb)) | |
4364 | skb_shinfo(skb)->frag_list = new_frag; | |
4365 | ||
4366 | new_frag->next = NULL; | |
4367 | ||
4368 | (*last_frag)->next = new_frag; | |
4369 | *last_frag = new_frag; | |
4370 | ||
4371 | skb->len += new_frag->len; | |
4372 | skb->data_len += new_frag->len; | |
4373 | skb->truesize += new_frag->truesize; | |
4374 | } | |
4375 | ||
4b51dae9 MM |
4376 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4377 | struct l2cap_ctrl *control) | |
84084a31 MM |
4378 | { |
4379 | int err = -EINVAL; | |
18778a63 | 4380 | |
4b51dae9 | 4381 | switch (control->sar) { |
7e0ef6ee | 4382 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4383 | if (chan->sdu) |
4384 | break; | |
18778a63 | 4385 | |
80b98027 | 4386 | err = chan->ops->recv(chan, skb); |
84084a31 | 4387 | break; |
18778a63 | 4388 | |
7e0ef6ee | 4389 | case L2CAP_SAR_START: |
84084a31 MM |
4390 | if (chan->sdu) |
4391 | break; | |
18778a63 | 4392 | |
6f61fd47 | 4393 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4394 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4395 | |
84084a31 MM |
4396 | if (chan->sdu_len > chan->imtu) { |
4397 | err = -EMSGSIZE; | |
4398 | break; | |
4399 | } | |
1890d36b | 4400 | |
84084a31 MM |
4401 | if (skb->len >= chan->sdu_len) |
4402 | break; | |
18778a63 | 4403 | |
84084a31 MM |
4404 | chan->sdu = skb; |
4405 | chan->sdu_last_frag = skb; | |
18778a63 | 4406 | |
84084a31 MM |
4407 | skb = NULL; |
4408 | err = 0; | |
18778a63 GP |
4409 | break; |
4410 | ||
7e0ef6ee | 4411 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4412 | if (!chan->sdu) |
84084a31 | 4413 | break; |
18778a63 | 4414 | |
84084a31 MM |
4415 | append_skb_frag(chan->sdu, skb, |
4416 | &chan->sdu_last_frag); | |
4417 | skb = NULL; | |
18778a63 | 4418 | |
84084a31 MM |
4419 | if (chan->sdu->len >= chan->sdu_len) |
4420 | break; | |
4178ba46 | 4421 | |
84084a31 | 4422 | err = 0; |
18778a63 GP |
4423 | break; |
4424 | ||
7e0ef6ee | 4425 | case L2CAP_SAR_END: |
6f61fd47 | 4426 | if (!chan->sdu) |
84084a31 | 4427 | break; |
18778a63 | 4428 | |
84084a31 MM |
4429 | append_skb_frag(chan->sdu, skb, |
4430 | &chan->sdu_last_frag); | |
4431 | skb = NULL; | |
4178ba46 | 4432 | |
84084a31 MM |
4433 | if (chan->sdu->len != chan->sdu_len) |
4434 | break; | |
18778a63 | 4435 | |
80b98027 | 4436 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4437 | |
84084a31 MM |
4438 | if (!err) { |
4439 | /* Reassembly complete */ | |
4440 | chan->sdu = NULL; | |
4441 | chan->sdu_last_frag = NULL; | |
4442 | chan->sdu_len = 0; | |
1890d36b | 4443 | } |
18778a63 GP |
4444 | break; |
4445 | } | |
4446 | ||
84084a31 MM |
4447 | if (err) { |
4448 | kfree_skb(skb); | |
4449 | kfree_skb(chan->sdu); | |
4450 | chan->sdu = NULL; | |
4451 | chan->sdu_last_frag = NULL; | |
4452 | chan->sdu_len = 0; | |
4453 | } | |
18778a63 | 4454 | |
84084a31 | 4455 | return err; |
18778a63 GP |
4456 | } |
4457 | ||
61aa4f5b | 4458 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4459 | { |
61aa4f5b | 4460 | u8 event; |
712132eb | 4461 | |
61aa4f5b MM |
4462 | if (chan->mode != L2CAP_MODE_ERTM) |
4463 | return; | |
712132eb | 4464 | |
61aa4f5b | 4465 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4466 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4467 | } |
4468 | ||
d2a7ac5d MM |
4469 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4470 | { | |
63838725 MM |
4471 | int err = 0; |
4472 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4473 | * until a gap is encountered. | |
4474 | */ | |
4475 | ||
4476 | BT_DBG("chan %p", chan); | |
4477 | ||
4478 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4479 | struct sk_buff *skb; | |
4480 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4481 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4482 | ||
4483 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4484 | ||
4485 | if (!skb) | |
4486 | break; | |
4487 | ||
4488 | skb_unlink(skb, &chan->srej_q); | |
4489 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4490 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4491 | if (err) | |
4492 | break; | |
4493 | } | |
4494 | ||
4495 | if (skb_queue_empty(&chan->srej_q)) { | |
4496 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4497 | l2cap_send_ack(chan); | |
4498 | } | |
4499 | ||
4500 | return err; | |
d2a7ac5d MM |
4501 | } |
4502 | ||
4503 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4504 | struct l2cap_ctrl *control) | |
4505 | { | |
f80842a8 MM |
4506 | struct sk_buff *skb; |
4507 | ||
4508 | BT_DBG("chan %p, control %p", chan, control); | |
4509 | ||
4510 | if (control->reqseq == chan->next_tx_seq) { | |
4511 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4512 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4513 | return; | |
4514 | } | |
4515 | ||
4516 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4517 | ||
4518 | if (skb == NULL) { | |
4519 | BT_DBG("Seq %d not available for retransmission", | |
4520 | control->reqseq); | |
4521 | return; | |
4522 | } | |
4523 | ||
4524 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4525 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4526 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4527 | return; | |
4528 | } | |
4529 | ||
4530 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4531 | ||
4532 | if (control->poll) { | |
4533 | l2cap_pass_to_tx(chan, control); | |
4534 | ||
4535 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4536 | l2cap_retransmit(chan, control); | |
4537 | l2cap_ertm_send(chan); | |
4538 | ||
4539 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4540 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4541 | chan->srej_save_reqseq = control->reqseq; | |
4542 | } | |
4543 | } else { | |
4544 | l2cap_pass_to_tx_fbit(chan, control); | |
4545 | ||
4546 | if (control->final) { | |
4547 | if (chan->srej_save_reqseq != control->reqseq || | |
4548 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4549 | &chan->conn_state)) | |
4550 | l2cap_retransmit(chan, control); | |
4551 | } else { | |
4552 | l2cap_retransmit(chan, control); | |
4553 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4554 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4555 | chan->srej_save_reqseq = control->reqseq; | |
4556 | } | |
4557 | } | |
4558 | } | |
d2a7ac5d MM |
4559 | } |
4560 | ||
4561 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4562 | struct l2cap_ctrl *control) | |
4563 | { | |
fcd289df MM |
4564 | struct sk_buff *skb; |
4565 | ||
4566 | BT_DBG("chan %p, control %p", chan, control); | |
4567 | ||
4568 | if (control->reqseq == chan->next_tx_seq) { | |
4569 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4570 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4571 | return; | |
4572 | } | |
4573 | ||
4574 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4575 | ||
4576 | if (chan->max_tx && skb && | |
4577 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4578 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4579 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4580 | return; | |
4581 | } | |
4582 | ||
4583 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4584 | ||
4585 | l2cap_pass_to_tx(chan, control); | |
4586 | ||
4587 | if (control->final) { | |
4588 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4589 | l2cap_retransmit_all(chan, control); | |
4590 | } else { | |
4591 | l2cap_retransmit_all(chan, control); | |
4592 | l2cap_ertm_send(chan); | |
4593 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4594 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4595 | } | |
d2a7ac5d MM |
4596 | } |
4597 | ||
4b51dae9 MM |
4598 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4599 | { | |
4600 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4601 | ||
4602 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4603 | chan->expected_tx_seq); | |
4604 | ||
4605 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4606 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4607 | chan->tx_win) { | |
4608 | /* See notes below regarding "double poll" and | |
4609 | * invalid packets. | |
4610 | */ | |
4611 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4612 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4613 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4614 | } else { | |
4615 | BT_DBG("Invalid - in window after SREJ sent"); | |
4616 | return L2CAP_TXSEQ_INVALID; | |
4617 | } | |
4618 | } | |
4619 | ||
4620 | if (chan->srej_list.head == txseq) { | |
4621 | BT_DBG("Expected SREJ"); | |
4622 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4623 | } | |
4624 | ||
4625 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4626 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4627 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4628 | } | |
4629 | ||
4630 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4631 | BT_DBG("Unexpected SREJ - not requested"); | |
4632 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4633 | } | |
4634 | } | |
4635 | ||
4636 | if (chan->expected_tx_seq == txseq) { | |
4637 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4638 | chan->tx_win) { | |
4639 | BT_DBG("Invalid - txseq outside tx window"); | |
4640 | return L2CAP_TXSEQ_INVALID; | |
4641 | } else { | |
4642 | BT_DBG("Expected"); | |
4643 | return L2CAP_TXSEQ_EXPECTED; | |
4644 | } | |
4645 | } | |
4646 | ||
4647 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4648 | __seq_offset(chan, chan->expected_tx_seq, | |
4649 | chan->last_acked_seq)){ | |
4650 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4651 | return L2CAP_TXSEQ_DUPLICATE; | |
4652 | } | |
4653 | ||
4654 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4655 | /* A source of invalid packets is a "double poll" condition, | |
4656 | * where delays cause us to send multiple poll packets. If | |
4657 | * the remote stack receives and processes both polls, | |
4658 | * sequence numbers can wrap around in such a way that a | |
4659 | * resent frame has a sequence number that looks like new data | |
4660 | * with a sequence gap. This would trigger an erroneous SREJ | |
4661 | * request. | |
4662 | * | |
4663 | * Fortunately, this is impossible with a tx window that's | |
4664 | * less than half of the maximum sequence number, which allows | |
4665 | * invalid frames to be safely ignored. | |
4666 | * | |
4667 | * With tx window sizes greater than half of the tx window | |
4668 | * maximum, the frame is invalid and cannot be ignored. This | |
4669 | * causes a disconnect. | |
4670 | */ | |
4671 | ||
4672 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4673 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4674 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4675 | } else { | |
4676 | BT_DBG("Invalid - txseq outside tx window"); | |
4677 | return L2CAP_TXSEQ_INVALID; | |
4678 | } | |
4679 | } else { | |
4680 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4681 | return L2CAP_TXSEQ_UNEXPECTED; | |
4682 | } | |
4683 | } | |
4684 | ||
d2a7ac5d MM |
4685 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4686 | struct l2cap_ctrl *control, | |
4687 | struct sk_buff *skb, u8 event) | |
4688 | { | |
4689 | int err = 0; | |
4690 | bool skb_in_use = 0; | |
4691 | ||
4692 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4693 | event); | |
4694 | ||
4695 | switch (event) { | |
4696 | case L2CAP_EV_RECV_IFRAME: | |
4697 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4698 | case L2CAP_TXSEQ_EXPECTED: | |
4699 | l2cap_pass_to_tx(chan, control); | |
4700 | ||
4701 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4702 | BT_DBG("Busy, discarding expected seq %d", | |
4703 | control->txseq); | |
4704 | break; | |
4705 | } | |
4706 | ||
4707 | chan->expected_tx_seq = __next_seq(chan, | |
4708 | control->txseq); | |
4709 | ||
4710 | chan->buffer_seq = chan->expected_tx_seq; | |
4711 | skb_in_use = 1; | |
4712 | ||
4713 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4714 | if (err) | |
4715 | break; | |
4716 | ||
4717 | if (control->final) { | |
4718 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4719 | &chan->conn_state)) { | |
4720 | control->final = 0; | |
4721 | l2cap_retransmit_all(chan, control); | |
4722 | l2cap_ertm_send(chan); | |
4723 | } | |
4724 | } | |
4725 | ||
4726 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4727 | l2cap_send_ack(chan); | |
4728 | break; | |
4729 | case L2CAP_TXSEQ_UNEXPECTED: | |
4730 | l2cap_pass_to_tx(chan, control); | |
4731 | ||
4732 | /* Can't issue SREJ frames in the local busy state. | |
4733 | * Drop this frame, it will be seen as missing | |
4734 | * when local busy is exited. | |
4735 | */ | |
4736 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4737 | BT_DBG("Busy, discarding unexpected seq %d", | |
4738 | control->txseq); | |
4739 | break; | |
4740 | } | |
4741 | ||
4742 | /* There was a gap in the sequence, so an SREJ | |
4743 | * must be sent for each missing frame. The | |
4744 | * current frame is stored for later use. | |
4745 | */ | |
4746 | skb_queue_tail(&chan->srej_q, skb); | |
4747 | skb_in_use = 1; | |
4748 | BT_DBG("Queued %p (queue len %d)", skb, | |
4749 | skb_queue_len(&chan->srej_q)); | |
4750 | ||
4751 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4752 | l2cap_seq_list_clear(&chan->srej_list); | |
4753 | l2cap_send_srej(chan, control->txseq); | |
4754 | ||
4755 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4756 | break; | |
4757 | case L2CAP_TXSEQ_DUPLICATE: | |
4758 | l2cap_pass_to_tx(chan, control); | |
4759 | break; | |
4760 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4761 | break; | |
4762 | case L2CAP_TXSEQ_INVALID: | |
4763 | default: | |
4764 | l2cap_send_disconn_req(chan->conn, chan, | |
4765 | ECONNRESET); | |
4766 | break; | |
4767 | } | |
4768 | break; | |
4769 | case L2CAP_EV_RECV_RR: | |
4770 | l2cap_pass_to_tx(chan, control); | |
4771 | if (control->final) { | |
4772 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4773 | ||
4774 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4775 | &chan->conn_state)) { | |
4776 | control->final = 0; | |
4777 | l2cap_retransmit_all(chan, control); | |
4778 | } | |
4779 | ||
4780 | l2cap_ertm_send(chan); | |
4781 | } else if (control->poll) { | |
4782 | l2cap_send_i_or_rr_or_rnr(chan); | |
4783 | } else { | |
4784 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4785 | &chan->conn_state) && | |
4786 | chan->unacked_frames) | |
4787 | __set_retrans_timer(chan); | |
4788 | ||
4789 | l2cap_ertm_send(chan); | |
4790 | } | |
4791 | break; | |
4792 | case L2CAP_EV_RECV_RNR: | |
4793 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4794 | l2cap_pass_to_tx(chan, control); | |
4795 | if (control && control->poll) { | |
4796 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4797 | l2cap_send_rr_or_rnr(chan, 0); | |
4798 | } | |
4799 | __clear_retrans_timer(chan); | |
4800 | l2cap_seq_list_clear(&chan->retrans_list); | |
4801 | break; | |
4802 | case L2CAP_EV_RECV_REJ: | |
4803 | l2cap_handle_rej(chan, control); | |
4804 | break; | |
4805 | case L2CAP_EV_RECV_SREJ: | |
4806 | l2cap_handle_srej(chan, control); | |
4807 | break; | |
4808 | default: | |
4809 | break; | |
4810 | } | |
4811 | ||
4812 | if (skb && !skb_in_use) { | |
4813 | BT_DBG("Freeing %p", skb); | |
4814 | kfree_skb(skb); | |
4815 | } | |
4816 | ||
4817 | return err; | |
4818 | } | |
4819 | ||
4820 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4821 | struct l2cap_ctrl *control, | |
4822 | struct sk_buff *skb, u8 event) | |
4823 | { | |
4824 | int err = 0; | |
4825 | u16 txseq = control->txseq; | |
4826 | bool skb_in_use = 0; | |
4827 | ||
4828 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4829 | event); | |
4830 | ||
4831 | switch (event) { | |
4832 | case L2CAP_EV_RECV_IFRAME: | |
4833 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4834 | case L2CAP_TXSEQ_EXPECTED: | |
4835 | /* Keep frame for reassembly later */ | |
4836 | l2cap_pass_to_tx(chan, control); | |
4837 | skb_queue_tail(&chan->srej_q, skb); | |
4838 | skb_in_use = 1; | |
4839 | BT_DBG("Queued %p (queue len %d)", skb, | |
4840 | skb_queue_len(&chan->srej_q)); | |
4841 | ||
4842 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4843 | break; | |
4844 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4845 | l2cap_seq_list_pop(&chan->srej_list); | |
4846 | ||
4847 | l2cap_pass_to_tx(chan, control); | |
4848 | skb_queue_tail(&chan->srej_q, skb); | |
4849 | skb_in_use = 1; | |
4850 | BT_DBG("Queued %p (queue len %d)", skb, | |
4851 | skb_queue_len(&chan->srej_q)); | |
4852 | ||
4853 | err = l2cap_rx_queued_iframes(chan); | |
4854 | if (err) | |
4855 | break; | |
4856 | ||
4857 | break; | |
4858 | case L2CAP_TXSEQ_UNEXPECTED: | |
4859 | /* Got a frame that can't be reassembled yet. | |
4860 | * Save it for later, and send SREJs to cover | |
4861 | * the missing frames. | |
4862 | */ | |
4863 | skb_queue_tail(&chan->srej_q, skb); | |
4864 | skb_in_use = 1; | |
4865 | BT_DBG("Queued %p (queue len %d)", skb, | |
4866 | skb_queue_len(&chan->srej_q)); | |
4867 | ||
4868 | l2cap_pass_to_tx(chan, control); | |
4869 | l2cap_send_srej(chan, control->txseq); | |
4870 | break; | |
4871 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4872 | /* This frame was requested with an SREJ, but | |
4873 | * some expected retransmitted frames are | |
4874 | * missing. Request retransmission of missing | |
4875 | * SREJ'd frames. | |
4876 | */ | |
4877 | skb_queue_tail(&chan->srej_q, skb); | |
4878 | skb_in_use = 1; | |
4879 | BT_DBG("Queued %p (queue len %d)", skb, | |
4880 | skb_queue_len(&chan->srej_q)); | |
4881 | ||
4882 | l2cap_pass_to_tx(chan, control); | |
4883 | l2cap_send_srej_list(chan, control->txseq); | |
4884 | break; | |
4885 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4886 | /* We've already queued this frame. Drop this copy. */ | |
4887 | l2cap_pass_to_tx(chan, control); | |
4888 | break; | |
4889 | case L2CAP_TXSEQ_DUPLICATE: | |
4890 | /* Expecting a later sequence number, so this frame | |
4891 | * was already received. Ignore it completely. | |
4892 | */ | |
4893 | break; | |
4894 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4895 | break; | |
4896 | case L2CAP_TXSEQ_INVALID: | |
4897 | default: | |
4898 | l2cap_send_disconn_req(chan->conn, chan, | |
4899 | ECONNRESET); | |
4900 | break; | |
4901 | } | |
4902 | break; | |
4903 | case L2CAP_EV_RECV_RR: | |
4904 | l2cap_pass_to_tx(chan, control); | |
4905 | if (control->final) { | |
4906 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4907 | ||
4908 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4909 | &chan->conn_state)) { | |
4910 | control->final = 0; | |
4911 | l2cap_retransmit_all(chan, control); | |
4912 | } | |
4913 | ||
4914 | l2cap_ertm_send(chan); | |
4915 | } else if (control->poll) { | |
4916 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4917 | &chan->conn_state) && | |
4918 | chan->unacked_frames) { | |
4919 | __set_retrans_timer(chan); | |
4920 | } | |
4921 | ||
4922 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4923 | l2cap_send_srej_tail(chan); | |
4924 | } else { | |
4925 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4926 | &chan->conn_state) && | |
4927 | chan->unacked_frames) | |
4928 | __set_retrans_timer(chan); | |
4929 | ||
4930 | l2cap_send_ack(chan); | |
4931 | } | |
4932 | break; | |
4933 | case L2CAP_EV_RECV_RNR: | |
4934 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4935 | l2cap_pass_to_tx(chan, control); | |
4936 | if (control->poll) { | |
4937 | l2cap_send_srej_tail(chan); | |
4938 | } else { | |
4939 | struct l2cap_ctrl rr_control; | |
4940 | memset(&rr_control, 0, sizeof(rr_control)); | |
4941 | rr_control.sframe = 1; | |
4942 | rr_control.super = L2CAP_SUPER_RR; | |
4943 | rr_control.reqseq = chan->buffer_seq; | |
4944 | l2cap_send_sframe(chan, &rr_control); | |
4945 | } | |
4946 | ||
4947 | break; | |
4948 | case L2CAP_EV_RECV_REJ: | |
4949 | l2cap_handle_rej(chan, control); | |
4950 | break; | |
4951 | case L2CAP_EV_RECV_SREJ: | |
4952 | l2cap_handle_srej(chan, control); | |
4953 | break; | |
4954 | } | |
4955 | ||
4956 | if (skb && !skb_in_use) { | |
4957 | BT_DBG("Freeing %p", skb); | |
4958 | kfree_skb(skb); | |
4959 | } | |
4960 | ||
4961 | return err; | |
4962 | } | |
4963 | ||
4964 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
4965 | { | |
4966 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
4967 | u16 unacked; | |
4968 | ||
4969 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
4970 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
4971 | } | |
4972 | ||
cec8ab6e MM |
4973 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4974 | struct sk_buff *skb, u8 event) | |
218bb9df | 4975 | { |
d2a7ac5d MM |
4976 | int err = 0; |
4977 | ||
4978 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
4979 | control, skb, event, chan->rx_state); | |
4980 | ||
4981 | if (__valid_reqseq(chan, control->reqseq)) { | |
4982 | switch (chan->rx_state) { | |
4983 | case L2CAP_RX_STATE_RECV: | |
4984 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
4985 | break; | |
4986 | case L2CAP_RX_STATE_SREJ_SENT: | |
4987 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
4988 | event); | |
4989 | break; | |
4990 | default: | |
4991 | /* shut it down */ | |
4992 | break; | |
4993 | } | |
4994 | } else { | |
4995 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
4996 | control->reqseq, chan->next_tx_seq, | |
4997 | chan->expected_ack_seq); | |
4998 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4999 | } | |
5000 | ||
5001 | return err; | |
cec8ab6e MM |
5002 | } |
5003 | ||
5004 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5005 | struct sk_buff *skb) | |
5006 | { | |
4b51dae9 MM |
5007 | int err = 0; |
5008 | ||
5009 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5010 | chan->rx_state); | |
5011 | ||
5012 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5013 | L2CAP_TXSEQ_EXPECTED) { | |
5014 | l2cap_pass_to_tx(chan, control); | |
5015 | ||
5016 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5017 | __next_seq(chan, chan->buffer_seq)); | |
5018 | ||
5019 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5020 | ||
5021 | l2cap_reassemble_sdu(chan, skb, control); | |
5022 | } else { | |
5023 | if (chan->sdu) { | |
5024 | kfree_skb(chan->sdu); | |
5025 | chan->sdu = NULL; | |
5026 | } | |
5027 | chan->sdu_last_frag = NULL; | |
5028 | chan->sdu_len = 0; | |
5029 | ||
5030 | if (skb) { | |
5031 | BT_DBG("Freeing %p", skb); | |
5032 | kfree_skb(skb); | |
5033 | } | |
5034 | } | |
5035 | ||
5036 | chan->last_acked_seq = control->txseq; | |
5037 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5038 | ||
5039 | return err; | |
cec8ab6e MM |
5040 | } |
5041 | ||
5042 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5043 | { | |
5044 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5045 | u16 len; | |
5046 | u8 event; | |
218bb9df | 5047 | |
b76bbd66 MM |
5048 | __unpack_control(chan, skb); |
5049 | ||
218bb9df GP |
5050 | len = skb->len; |
5051 | ||
5052 | /* | |
5053 | * We can just drop the corrupted I-frame here. | |
5054 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5055 | * procedures and ask for retransmission. |
218bb9df | 5056 | */ |
47d1ec61 | 5057 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5058 | goto drop; |
5059 | ||
cec8ab6e | 5060 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5061 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5062 | |
47d1ec61 | 5063 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5064 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5065 | |
47d1ec61 | 5066 | if (len > chan->mps) { |
8c1d787b | 5067 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5068 | goto drop; |
5069 | } | |
5070 | ||
cec8ab6e MM |
5071 | if (!control->sframe) { |
5072 | int err; | |
218bb9df | 5073 | |
cec8ab6e MM |
5074 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5075 | control->sar, control->reqseq, control->final, | |
5076 | control->txseq); | |
218bb9df | 5077 | |
cec8ab6e MM |
5078 | /* Validate F-bit - F=0 always valid, F=1 only |
5079 | * valid in TX WAIT_F | |
5080 | */ | |
5081 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5082 | goto drop; |
cec8ab6e MM |
5083 | |
5084 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5085 | event = L2CAP_EV_RECV_IFRAME; | |
5086 | err = l2cap_rx(chan, control, skb, event); | |
5087 | } else { | |
5088 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5089 | } |
5090 | ||
cec8ab6e MM |
5091 | if (err) |
5092 | l2cap_send_disconn_req(chan->conn, chan, | |
5093 | ECONNRESET); | |
218bb9df | 5094 | } else { |
cec8ab6e MM |
5095 | const u8 rx_func_to_event[4] = { |
5096 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5097 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5098 | }; | |
5099 | ||
5100 | /* Only I-frames are expected in streaming mode */ | |
5101 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5102 | goto drop; | |
5103 | ||
5104 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5105 | control->reqseq, control->final, control->poll, | |
5106 | control->super); | |
5107 | ||
218bb9df GP |
5108 | if (len != 0) { |
5109 | BT_ERR("%d", len); | |
8c1d787b | 5110 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5111 | goto drop; |
5112 | } | |
5113 | ||
cec8ab6e MM |
5114 | /* Validate F and P bits */ |
5115 | if (control->final && (control->poll || | |
5116 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5117 | goto drop; | |
5118 | ||
5119 | event = rx_func_to_event[control->super]; | |
5120 | if (l2cap_rx(chan, control, skb, event)) | |
5121 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5122 | } |
5123 | ||
5124 | return 0; | |
5125 | ||
5126 | drop: | |
5127 | kfree_skb(skb); | |
5128 | return 0; | |
5129 | } | |
5130 | ||
13ca56e0 AE |
5131 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5132 | struct sk_buff *skb) | |
1da177e4 | 5133 | { |
48454079 | 5134 | struct l2cap_chan *chan; |
1da177e4 | 5135 | |
baa7e1fa | 5136 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5137 | if (!chan) { |
97e8e89d AE |
5138 | if (cid == L2CAP_CID_A2MP) { |
5139 | chan = a2mp_channel_create(conn, skb); | |
5140 | if (!chan) { | |
5141 | kfree_skb(skb); | |
13ca56e0 | 5142 | return; |
97e8e89d AE |
5143 | } |
5144 | ||
5145 | l2cap_chan_lock(chan); | |
5146 | } else { | |
5147 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5148 | /* Drop packet and return */ | |
5149 | kfree_skb(skb); | |
13ca56e0 | 5150 | return; |
97e8e89d | 5151 | } |
1da177e4 LT |
5152 | } |
5153 | ||
49208c9c | 5154 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5155 | |
89bc500e | 5156 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5157 | goto drop; |
5158 | ||
0c1bc5c6 | 5159 | switch (chan->mode) { |
1c2acffb GP |
5160 | case L2CAP_MODE_BASIC: |
5161 | /* If socket recv buffers overflows we drop data here | |
5162 | * which is *bad* because L2CAP has to be reliable. | |
5163 | * But we don't have any other choice. L2CAP doesn't | |
5164 | * provide flow control mechanism. */ | |
1da177e4 | 5165 | |
0c1bc5c6 | 5166 | if (chan->imtu < skb->len) |
1c2acffb | 5167 | goto drop; |
1da177e4 | 5168 | |
80b98027 | 5169 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5170 | goto done; |
5171 | break; | |
5172 | ||
5173 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5174 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5175 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5176 | goto done; |
5177 | ||
1c2acffb | 5178 | default: |
0c1bc5c6 | 5179 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5180 | break; |
5181 | } | |
1da177e4 LT |
5182 | |
5183 | drop: | |
5184 | kfree_skb(skb); | |
5185 | ||
5186 | done: | |
6be36555 | 5187 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5188 | } |
5189 | ||
84104b24 AE |
5190 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5191 | struct sk_buff *skb) | |
1da177e4 | 5192 | { |
23691d75 | 5193 | struct l2cap_chan *chan; |
1da177e4 | 5194 | |
c2287681 | 5195 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5196 | if (!chan) |
1da177e4 LT |
5197 | goto drop; |
5198 | ||
5b4cedaa | 5199 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5200 | |
89bc500e | 5201 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5202 | goto drop; |
5203 | ||
e13e21dc | 5204 | if (chan->imtu < skb->len) |
1da177e4 LT |
5205 | goto drop; |
5206 | ||
80b98027 | 5207 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5208 | return; |
1da177e4 LT |
5209 | |
5210 | drop: | |
5211 | kfree_skb(skb); | |
1da177e4 LT |
5212 | } |
5213 | ||
6810fca7 AE |
5214 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5215 | struct sk_buff *skb) | |
9f69bda6 | 5216 | { |
23691d75 | 5217 | struct l2cap_chan *chan; |
9f69bda6 | 5218 | |
c2287681 | 5219 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5220 | if (!chan) |
9f69bda6 GP |
5221 | goto drop; |
5222 | ||
5b4cedaa | 5223 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5224 | |
89bc500e | 5225 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5226 | goto drop; |
5227 | ||
e13e21dc | 5228 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5229 | goto drop; |
5230 | ||
80b98027 | 5231 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5232 | return; |
9f69bda6 GP |
5233 | |
5234 | drop: | |
5235 | kfree_skb(skb); | |
9f69bda6 GP |
5236 | } |
5237 | ||
1da177e4 LT |
5238 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5239 | { | |
5240 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5241 | u16 cid, len; |
5242 | __le16 psm; | |
1da177e4 LT |
5243 | |
5244 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5245 | cid = __le16_to_cpu(lh->cid); | |
5246 | len = __le16_to_cpu(lh->len); | |
5247 | ||
1c2acffb GP |
5248 | if (len != skb->len) { |
5249 | kfree_skb(skb); | |
5250 | return; | |
5251 | } | |
5252 | ||
1da177e4 LT |
5253 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5254 | ||
5255 | switch (cid) { | |
3300d9a9 | 5256 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5257 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5258 | l2cap_sig_channel(conn, skb); |
5259 | break; | |
5260 | ||
8db4dc46 | 5261 | case L2CAP_CID_CONN_LESS: |
097db76c | 5262 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5263 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5264 | l2cap_conless_channel(conn, psm, skb); |
5265 | break; | |
5266 | ||
9f69bda6 GP |
5267 | case L2CAP_CID_LE_DATA: |
5268 | l2cap_att_channel(conn, cid, skb); | |
5269 | break; | |
5270 | ||
b501d6a1 AB |
5271 | case L2CAP_CID_SMP: |
5272 | if (smp_sig_channel(conn, skb)) | |
5273 | l2cap_conn_del(conn->hcon, EACCES); | |
5274 | break; | |
5275 | ||
1da177e4 LT |
5276 | default: |
5277 | l2cap_data_channel(conn, cid, skb); | |
5278 | break; | |
5279 | } | |
5280 | } | |
5281 | ||
5282 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5283 | ||
686ebf28 | 5284 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5285 | { |
5286 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5287 | struct l2cap_chan *c; |
1da177e4 | 5288 | |
1da177e4 LT |
5289 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5290 | ||
5291 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5292 | read_lock(&chan_list_lock); |
5293 | list_for_each_entry(c, &chan_list, global_l) { | |
5294 | struct sock *sk = c->sk; | |
4343478f | 5295 | |
89bc500e | 5296 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5297 | continue; |
5298 | ||
5299 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5300 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5301 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5302 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5303 | exact++; |
2af6b9d5 MH |
5304 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5305 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5306 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5307 | lm2 |= HCI_LM_MASTER; |
5308 | } | |
1da177e4 | 5309 | } |
23691d75 | 5310 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5311 | |
5312 | return exact ? lm1 : lm2; | |
5313 | } | |
5314 | ||
686ebf28 | 5315 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5316 | { |
0139418c MH |
5317 | struct l2cap_conn *conn; |
5318 | ||
1da177e4 LT |
5319 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5320 | ||
1da177e4 | 5321 | if (!status) { |
1da177e4 LT |
5322 | conn = l2cap_conn_add(hcon, status); |
5323 | if (conn) | |
5324 | l2cap_conn_ready(conn); | |
0139418c | 5325 | } else |
e175072f | 5326 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5327 | |
5328 | return 0; | |
5329 | } | |
5330 | ||
686ebf28 | 5331 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5332 | { |
5333 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5334 | ||
5335 | BT_DBG("hcon %p", hcon); | |
5336 | ||
686ebf28 | 5337 | if (!conn) |
9f5a0d7b | 5338 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5339 | return conn->disc_reason; |
5340 | } | |
5341 | ||
686ebf28 | 5342 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5343 | { |
5344 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5345 | ||
e175072f | 5346 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5347 | return 0; |
5348 | } | |
5349 | ||
4343478f | 5350 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5351 | { |
715ec005 | 5352 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5353 | return; |
5354 | ||
f62e4323 | 5355 | if (encrypt == 0x00) { |
4343478f | 5356 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5357 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5358 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5359 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5360 | } else { |
4343478f | 5361 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5362 | __clear_chan_timer(chan); |
f62e4323 MH |
5363 | } |
5364 | } | |
5365 | ||
686ebf28 | 5366 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5367 | { |
0139418c | 5368 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5369 | struct l2cap_chan *chan; |
1da177e4 | 5370 | |
0139418c | 5371 | if (!conn) |
1da177e4 | 5372 | return 0; |
0139418c | 5373 | |
1da177e4 LT |
5374 | BT_DBG("conn %p", conn); |
5375 | ||
160dc6ac | 5376 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5377 | if (!status && encrypt) |
5378 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5379 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5380 | } |
5381 | ||
3df91ea2 | 5382 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5383 | |
3df91ea2 | 5384 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5385 | l2cap_chan_lock(chan); |
1da177e4 | 5386 | |
f1cb9af5 VCG |
5387 | BT_DBG("chan->scid %d", chan->scid); |
5388 | ||
5389 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5390 | if (!status && encrypt) { | |
5391 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5392 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5393 | } |
5394 | ||
6be36555 | 5395 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5396 | continue; |
5397 | } | |
5398 | ||
c1360a1c | 5399 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5400 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5401 | continue; |
5402 | } | |
5403 | ||
89bc500e GP |
5404 | if (!status && (chan->state == BT_CONNECTED || |
5405 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5406 | struct sock *sk = chan->sk; |
5407 | ||
c5daa683 | 5408 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5409 | sk->sk_state_change(sk); |
5410 | ||
4343478f | 5411 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5412 | l2cap_chan_unlock(chan); |
9719f8af MH |
5413 | continue; |
5414 | } | |
5415 | ||
89bc500e | 5416 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5417 | if (!status) { |
9b27f350 | 5418 | l2cap_send_conn_req(chan); |
b1235d79 | 5419 | } else { |
ba13ccd9 | 5420 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5421 | } |
89bc500e | 5422 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5423 | struct sock *sk = chan->sk; |
b1235d79 | 5424 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5425 | __u16 res, stat; |
1da177e4 | 5426 | |
6be36555 AE |
5427 | lock_sock(sk); |
5428 | ||
b1235d79 | 5429 | if (!status) { |
c5daa683 GP |
5430 | if (test_bit(BT_SK_DEFER_SETUP, |
5431 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5432 | struct sock *parent = bt_sk(sk)->parent; |
5433 | res = L2CAP_CR_PEND; | |
5434 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5435 | if (parent) |
5436 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5437 | } else { |
0e587be7 | 5438 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5439 | res = L2CAP_CR_SUCCESS; |
5440 | stat = L2CAP_CS_NO_INFO; | |
5441 | } | |
b1235d79 | 5442 | } else { |
0e587be7 | 5443 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5444 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5445 | res = L2CAP_CR_SEC_BLOCK; |
5446 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5447 | } |
5448 | ||
6be36555 AE |
5449 | release_sock(sk); |
5450 | ||
fe4128e0 GP |
5451 | rsp.scid = cpu_to_le16(chan->dcid); |
5452 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5453 | rsp.result = cpu_to_le16(res); |
5454 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5455 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5456 | sizeof(rsp), &rsp); | |
2d369359 MM |
5457 | |
5458 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5459 | res == L2CAP_CR_SUCCESS) { | |
5460 | char buf[128]; | |
5461 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5462 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5463 | L2CAP_CONF_REQ, | |
5464 | l2cap_build_conf_req(chan, buf), | |
5465 | buf); | |
5466 | chan->num_conf_req++; | |
5467 | } | |
b1235d79 | 5468 | } |
1da177e4 | 5469 | |
6be36555 | 5470 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5471 | } |
5472 | ||
3df91ea2 | 5473 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5474 | |
1da177e4 LT |
5475 | return 0; |
5476 | } | |
5477 | ||
686ebf28 | 5478 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5479 | { |
5480 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5481 | ||
5a08ecce AE |
5482 | if (!conn) |
5483 | conn = l2cap_conn_add(hcon, 0); | |
5484 | ||
5485 | if (!conn) | |
1da177e4 LT |
5486 | goto drop; |
5487 | ||
5488 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5489 | ||
e702112f | 5490 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5491 | struct l2cap_hdr *hdr; |
5492 | int len; | |
5493 | ||
5494 | if (conn->rx_len) { | |
5495 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5496 | kfree_skb(conn->rx_skb); | |
5497 | conn->rx_skb = NULL; | |
5498 | conn->rx_len = 0; | |
5499 | l2cap_conn_unreliable(conn, ECOMM); | |
5500 | } | |
5501 | ||
aae7fe22 AE |
5502 | /* Start fragment always begin with Basic L2CAP header */ |
5503 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5504 | BT_ERR("Frame is too short (len %d)", skb->len); |
5505 | l2cap_conn_unreliable(conn, ECOMM); | |
5506 | goto drop; | |
5507 | } | |
5508 | ||
5509 | hdr = (struct l2cap_hdr *) skb->data; | |
5510 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5511 | ||
5512 | if (len == skb->len) { | |
5513 | /* Complete frame received */ | |
5514 | l2cap_recv_frame(conn, skb); | |
5515 | return 0; | |
5516 | } | |
5517 | ||
5518 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5519 | ||
5520 | if (skb->len > len) { | |
5521 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5522 | skb->len, len); | |
5523 | l2cap_conn_unreliable(conn, ECOMM); | |
5524 | goto drop; | |
5525 | } | |
5526 | ||
5527 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5528 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5529 | if (!conn->rx_skb) | |
1da177e4 LT |
5530 | goto drop; |
5531 | ||
d626f62b | 5532 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5533 | skb->len); |
1da177e4 LT |
5534 | conn->rx_len = len - skb->len; |
5535 | } else { | |
5536 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5537 | ||
5538 | if (!conn->rx_len) { | |
5539 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5540 | l2cap_conn_unreliable(conn, ECOMM); | |
5541 | goto drop; | |
5542 | } | |
5543 | ||
5544 | if (skb->len > conn->rx_len) { | |
5545 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5546 | skb->len, conn->rx_len); | |
5547 | kfree_skb(conn->rx_skb); | |
5548 | conn->rx_skb = NULL; | |
5549 | conn->rx_len = 0; | |
5550 | l2cap_conn_unreliable(conn, ECOMM); | |
5551 | goto drop; | |
5552 | } | |
5553 | ||
d626f62b | 5554 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5555 | skb->len); |
1da177e4 LT |
5556 | conn->rx_len -= skb->len; |
5557 | ||
5558 | if (!conn->rx_len) { | |
5559 | /* Complete frame received */ | |
5560 | l2cap_recv_frame(conn, conn->rx_skb); | |
5561 | conn->rx_skb = NULL; | |
5562 | } | |
5563 | } | |
5564 | ||
5565 | drop: | |
5566 | kfree_skb(skb); | |
5567 | return 0; | |
5568 | } | |
5569 | ||
aef7d97c | 5570 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5571 | { |
23691d75 | 5572 | struct l2cap_chan *c; |
1da177e4 | 5573 | |
333055f2 | 5574 | read_lock(&chan_list_lock); |
1da177e4 | 5575 | |
23691d75 GP |
5576 | list_for_each_entry(c, &chan_list, global_l) { |
5577 | struct sock *sk = c->sk; | |
101545f6 | 5578 | |
903d343e | 5579 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5580 | batostr(&bt_sk(sk)->src), |
5581 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5582 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5583 | c->scid, c->dcid, c->imtu, c->omtu, |
5584 | c->sec_level, c->mode); | |
61e1b4b7 | 5585 | } |
1da177e4 | 5586 | |
333055f2 | 5587 | read_unlock(&chan_list_lock); |
1da177e4 | 5588 | |
aef7d97c | 5589 | return 0; |
1da177e4 LT |
5590 | } |
5591 | ||
aef7d97c MH |
5592 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5593 | { | |
5594 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5595 | } | |
5596 | ||
5597 | static const struct file_operations l2cap_debugfs_fops = { | |
5598 | .open = l2cap_debugfs_open, | |
5599 | .read = seq_read, | |
5600 | .llseek = seq_lseek, | |
5601 | .release = single_release, | |
5602 | }; | |
5603 | ||
5604 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5605 | |
64274518 | 5606 | int __init l2cap_init(void) |
1da177e4 LT |
5607 | { |
5608 | int err; | |
be9d1227 | 5609 | |
bb58f747 | 5610 | err = l2cap_init_sockets(); |
1da177e4 LT |
5611 | if (err < 0) |
5612 | return err; | |
5613 | ||
aef7d97c MH |
5614 | if (bt_debugfs) { |
5615 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5616 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5617 | if (!l2cap_debugfs) | |
5618 | BT_ERR("Failed to create L2CAP debug file"); | |
5619 | } | |
1da177e4 | 5620 | |
1da177e4 | 5621 | return 0; |
1da177e4 LT |
5622 | } |
5623 | ||
64274518 | 5624 | void l2cap_exit(void) |
1da177e4 | 5625 | { |
aef7d97c | 5626 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5627 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5628 | } |
5629 | ||
d1c4a17d GP |
5630 | module_param(disable_ertm, bool, 0644); |
5631 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |