Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 39 | #include <net/bluetooth/smp.h> |
1da177e4 | 40 | |
d1de6d46 | 41 | bool disable_ertm; |
f0709e03 | 42 | |
47ec1dcd | 43 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 44 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 45 | |
b5ad8b7f JB |
46 | static LIST_HEAD(chan_list); |
47 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 48 | |
1da177e4 LT |
49 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
50 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
51 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
52 | void *data); | |
710f9b0a | 53 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 54 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 55 | struct l2cap_chan *chan, int err); |
1da177e4 | 56 | |
d660366d | 57 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
58 | struct sk_buff_head *skbs, u8 event); |
59 | ||
0139418c | 60 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 61 | |
baa7e1fa | 62 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 63 | { |
3df91ea2 | 64 | struct l2cap_chan *c; |
3d57dc68 | 65 | |
3df91ea2 AE |
66 | list_for_each_entry(c, &conn->chan_l, list) { |
67 | if (c->dcid == cid) | |
68 | return c; | |
0139418c | 69 | } |
3df91ea2 | 70 | return NULL; |
0139418c MH |
71 | } |
72 | ||
baa7e1fa | 73 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 74 | { |
3df91ea2 | 75 | struct l2cap_chan *c; |
3d57dc68 | 76 | |
3df91ea2 AE |
77 | list_for_each_entry(c, &conn->chan_l, list) { |
78 | if (c->scid == cid) | |
79 | return c; | |
0139418c | 80 | } |
3df91ea2 | 81 | return NULL; |
0139418c MH |
82 | } |
83 | ||
84 | /* Find channel with given SCID. | |
ef191ade | 85 | * Returns locked channel. */ |
baa7e1fa | 86 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 87 | { |
48454079 | 88 | struct l2cap_chan *c; |
baa7e1fa | 89 | |
3df91ea2 | 90 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 91 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
92 | if (c) |
93 | l2cap_chan_lock(c); | |
3df91ea2 AE |
94 | mutex_unlock(&conn->chan_lock); |
95 | ||
48454079 | 96 | return c; |
0139418c MH |
97 | } |
98 | ||
baa7e1fa | 99 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 100 | { |
3df91ea2 | 101 | struct l2cap_chan *c; |
3d57dc68 | 102 | |
3df91ea2 AE |
103 | list_for_each_entry(c, &conn->chan_l, list) { |
104 | if (c->ident == ident) | |
105 | return c; | |
0139418c | 106 | } |
3df91ea2 | 107 | return NULL; |
0139418c MH |
108 | } |
109 | ||
23691d75 | 110 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 111 | { |
23691d75 | 112 | struct l2cap_chan *c; |
9e4425ff | 113 | |
23691d75 GP |
114 | list_for_each_entry(c, &chan_list, global_l) { |
115 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 116 | return c; |
9e4425ff | 117 | } |
250938cb | 118 | return NULL; |
9e4425ff GP |
119 | } |
120 | ||
121 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
122 | { | |
73b2ec18 GP |
123 | int err; |
124 | ||
333055f2 | 125 | write_lock(&chan_list_lock); |
9e4425ff | 126 | |
23691d75 | 127 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
128 | err = -EADDRINUSE; |
129 | goto done; | |
9e4425ff GP |
130 | } |
131 | ||
73b2ec18 GP |
132 | if (psm) { |
133 | chan->psm = psm; | |
134 | chan->sport = psm; | |
135 | err = 0; | |
136 | } else { | |
137 | u16 p; | |
138 | ||
139 | err = -EINVAL; | |
140 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 141 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
142 | chan->psm = cpu_to_le16(p); |
143 | chan->sport = cpu_to_le16(p); | |
144 | err = 0; | |
145 | break; | |
146 | } | |
147 | } | |
9e4425ff | 148 | |
73b2ec18 | 149 | done: |
333055f2 | 150 | write_unlock(&chan_list_lock); |
73b2ec18 | 151 | return err; |
9e4425ff GP |
152 | } |
153 | ||
154 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
155 | { | |
333055f2 | 156 | write_lock(&chan_list_lock); |
9e4425ff GP |
157 | |
158 | chan->scid = scid; | |
159 | ||
333055f2 | 160 | write_unlock(&chan_list_lock); |
9e4425ff GP |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
baa7e1fa | 165 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 166 | { |
8db4dc46 | 167 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 168 | |
8db4dc46 | 169 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 170 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
171 | return cid; |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
0e587be7 | 177 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 178 | { |
42d2d87c | 179 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
180 | state_to_string(state)); |
181 | ||
89bc500e | 182 | chan->state = state; |
80b98027 | 183 | chan->ops->state_change(chan, state); |
89bc500e GP |
184 | } |
185 | ||
0e587be7 AE |
186 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
187 | { | |
188 | struct sock *sk = chan->sk; | |
189 | ||
190 | lock_sock(sk); | |
191 | __l2cap_state_change(chan, state); | |
192 | release_sock(sk); | |
193 | } | |
194 | ||
2e0052e4 AE |
195 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
196 | { | |
197 | struct sock *sk = chan->sk; | |
198 | ||
199 | sk->sk_err = err; | |
200 | } | |
201 | ||
202 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
203 | { | |
204 | struct sock *sk = chan->sk; | |
205 | ||
206 | lock_sock(sk); | |
207 | __l2cap_chan_set_err(chan, err); | |
208 | release_sock(sk); | |
209 | } | |
210 | ||
4239d16f MM |
211 | static void __set_retrans_timer(struct l2cap_chan *chan) |
212 | { | |
213 | if (!delayed_work_pending(&chan->monitor_timer) && | |
214 | chan->retrans_timeout) { | |
215 | l2cap_set_timer(chan, &chan->retrans_timer, | |
216 | msecs_to_jiffies(chan->retrans_timeout)); | |
217 | } | |
218 | } | |
219 | ||
220 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
221 | { | |
222 | __clear_retrans_timer(chan); | |
223 | if (chan->monitor_timeout) { | |
224 | l2cap_set_timer(chan, &chan->monitor_timer, | |
225 | msecs_to_jiffies(chan->monitor_timeout)); | |
226 | } | |
227 | } | |
228 | ||
608bcc6d MM |
229 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
230 | u16 seq) | |
231 | { | |
232 | struct sk_buff *skb; | |
233 | ||
234 | skb_queue_walk(head, skb) { | |
235 | if (bt_cb(skb)->control.txseq == seq) | |
236 | return skb; | |
237 | } | |
238 | ||
239 | return NULL; | |
240 | } | |
241 | ||
3c588192 MM |
242 | /* ---- L2CAP sequence number lists ---- */ |
243 | ||
244 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
245 | * SREJ requests that are received and for frames that are to be | |
246 | * retransmitted. These seq_list functions implement a singly-linked | |
247 | * list in an array, where membership in the list can also be checked | |
248 | * in constant time. Items can also be added to the tail of the list | |
249 | * and removed from the head in constant time, without further memory | |
250 | * allocs or frees. | |
251 | */ | |
252 | ||
253 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
254 | { | |
255 | size_t alloc_size, i; | |
256 | ||
257 | /* Allocated size is a power of 2 to map sequence numbers | |
258 | * (which may be up to 14 bits) in to a smaller array that is | |
259 | * sized for the negotiated ERTM transmit windows. | |
260 | */ | |
261 | alloc_size = roundup_pow_of_two(size); | |
262 | ||
263 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
264 | if (!seq_list->list) | |
265 | return -ENOMEM; | |
266 | ||
267 | seq_list->mask = alloc_size - 1; | |
268 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
269 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
270 | for (i = 0; i < alloc_size; i++) | |
271 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
277 | { | |
278 | kfree(seq_list->list); | |
279 | } | |
280 | ||
281 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
282 | u16 seq) | |
283 | { | |
284 | /* Constant-time check for list membership */ | |
285 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
286 | } | |
287 | ||
288 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
289 | { | |
290 | u16 mask = seq_list->mask; | |
291 | ||
292 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
293 | /* In case someone tries to pop the head of an empty list */ | |
294 | return L2CAP_SEQ_LIST_CLEAR; | |
295 | } else if (seq_list->head == seq) { | |
296 | /* Head can be removed in constant time */ | |
297 | seq_list->head = seq_list->list[seq & mask]; | |
298 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
299 | ||
300 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
301 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
302 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
303 | } | |
304 | } else { | |
305 | /* Walk the list to find the sequence number */ | |
306 | u16 prev = seq_list->head; | |
307 | while (seq_list->list[prev & mask] != seq) { | |
308 | prev = seq_list->list[prev & mask]; | |
309 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
310 | return L2CAP_SEQ_LIST_CLEAR; | |
311 | } | |
312 | ||
313 | /* Unlink the number from the list and clear it */ | |
314 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
315 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
316 | if (seq_list->tail == seq) | |
317 | seq_list->tail = prev; | |
318 | } | |
319 | return seq; | |
320 | } | |
321 | ||
322 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
323 | { | |
324 | /* Remove the head in constant time */ | |
325 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
326 | } | |
327 | ||
328 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
329 | { | |
f522ae36 | 330 | u16 i; |
3c588192 | 331 | |
f522ae36 GP |
332 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
333 | return; | |
334 | ||
335 | for (i = 0; i <= seq_list->mask; i++) | |
336 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
337 | ||
338 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
339 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
340 | } |
341 | ||
342 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
343 | { | |
344 | u16 mask = seq_list->mask; | |
345 | ||
346 | /* All appends happen in constant time */ | |
347 | ||
f522ae36 GP |
348 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
349 | return; | |
3c588192 | 350 | |
f522ae36 GP |
351 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
352 | seq_list->head = seq; | |
353 | else | |
354 | seq_list->list[seq_list->tail & mask] = seq; | |
355 | ||
356 | seq_list->tail = seq; | |
357 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
358 | } |
359 | ||
721c4181 | 360 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 361 | { |
721c4181 GP |
362 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
363 | chan_timer.work); | |
3df91ea2 | 364 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
365 | int reason; |
366 | ||
e05dcc32 | 367 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 368 | |
3df91ea2 | 369 | mutex_lock(&conn->chan_lock); |
6be36555 | 370 | l2cap_chan_lock(chan); |
ab07801d | 371 | |
89bc500e | 372 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 373 | reason = ECONNREFUSED; |
89bc500e | 374 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
375 | chan->sec_level != BT_SECURITY_SDP) |
376 | reason = ECONNREFUSED; | |
377 | else | |
378 | reason = ETIMEDOUT; | |
379 | ||
0f852724 | 380 | l2cap_chan_close(chan, reason); |
ab07801d | 381 | |
6be36555 | 382 | l2cap_chan_unlock(chan); |
ab07801d | 383 | |
80b98027 | 384 | chan->ops->close(chan); |
3df91ea2 AE |
385 | mutex_unlock(&conn->chan_lock); |
386 | ||
371fd835 | 387 | l2cap_chan_put(chan); |
ab07801d GP |
388 | } |
389 | ||
eef1d9b6 | 390 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
391 | { |
392 | struct l2cap_chan *chan; | |
393 | ||
394 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
395 | if (!chan) | |
396 | return NULL; | |
397 | ||
c03b355e AE |
398 | mutex_init(&chan->lock); |
399 | ||
333055f2 | 400 | write_lock(&chan_list_lock); |
23691d75 | 401 | list_add(&chan->global_l, &chan_list); |
333055f2 | 402 | write_unlock(&chan_list_lock); |
23691d75 | 403 | |
721c4181 | 404 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 405 | |
89bc500e GP |
406 | chan->state = BT_OPEN; |
407 | ||
71ba0e56 GP |
408 | atomic_set(&chan->refcnt, 1); |
409 | ||
2827011f MM |
410 | /* This flag is cleared in l2cap_chan_ready() */ |
411 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
412 | ||
eef1d9b6 | 413 | BT_DBG("chan %p", chan); |
abc545b8 | 414 | |
48454079 GP |
415 | return chan; |
416 | } | |
417 | ||
23691d75 | 418 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 419 | { |
333055f2 | 420 | write_lock(&chan_list_lock); |
23691d75 | 421 | list_del(&chan->global_l); |
333055f2 | 422 | write_unlock(&chan_list_lock); |
23691d75 | 423 | |
371fd835 | 424 | l2cap_chan_put(chan); |
6ff5abbf GP |
425 | } |
426 | ||
bd4b1653 AE |
427 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
428 | { | |
429 | chan->fcs = L2CAP_FCS_CRC16; | |
430 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
431 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
432 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->sec_level = BT_SECURITY_LOW; | |
434 | ||
435 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
436 | } | |
437 | ||
14a28491 | 438 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 439 | { |
af05b30b | 440 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 441 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 442 | |
9f5a0d7b | 443 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 444 | |
8c1d787b | 445 | chan->conn = conn; |
0139418c | 446 | |
5491120e AE |
447 | switch (chan->chan_type) { |
448 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
449 | if (conn->hcon->type == LE_LINK) { |
450 | /* LE connection */ | |
0c1bc5c6 | 451 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
452 | chan->scid = L2CAP_CID_LE_DATA; |
453 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
454 | } else { |
455 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 456 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 457 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 458 | } |
5491120e AE |
459 | break; |
460 | ||
461 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 462 | /* Connectionless socket */ |
fe4128e0 GP |
463 | chan->scid = L2CAP_CID_CONN_LESS; |
464 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 465 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
466 | break; |
467 | ||
416fa752 AE |
468 | case L2CAP_CHAN_CONN_FIX_A2MP: |
469 | chan->scid = L2CAP_CID_A2MP; | |
470 | chan->dcid = L2CAP_CID_A2MP; | |
471 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
472 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
473 | break; | |
474 | ||
5491120e | 475 | default: |
0139418c | 476 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
477 | chan->scid = L2CAP_CID_SIGNALING; |
478 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 479 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
480 | } |
481 | ||
8f7975b1 AE |
482 | chan->local_id = L2CAP_BESTEFFORT_ID; |
483 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
484 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
485 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
486 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
487 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
488 | ||
371fd835 | 489 | l2cap_chan_hold(chan); |
baa7e1fa | 490 | |
3df91ea2 | 491 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
492 | } |
493 | ||
466f8004 | 494 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
495 | { |
496 | mutex_lock(&conn->chan_lock); | |
497 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 498 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
499 | } |
500 | ||
466f8004 | 501 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 502 | { |
8c1d787b | 503 | struct l2cap_conn *conn = chan->conn; |
0139418c | 504 | |
c9b66675 | 505 | __clear_chan_timer(chan); |
0139418c | 506 | |
49208c9c | 507 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 508 | |
8e87d142 | 509 | if (conn) { |
baa7e1fa | 510 | /* Delete from channel list */ |
3df91ea2 | 511 | list_del(&chan->list); |
3d57dc68 | 512 | |
371fd835 | 513 | l2cap_chan_put(chan); |
baa7e1fa | 514 | |
8c1d787b | 515 | chan->conn = NULL; |
0139418c MH |
516 | hci_conn_put(conn->hcon); |
517 | } | |
518 | ||
c0df7f6e AE |
519 | if (chan->ops->teardown) |
520 | chan->ops->teardown(chan, err); | |
6be36555 | 521 | |
2827011f | 522 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 523 | return; |
2ead70b8 | 524 | |
ee556f66 GP |
525 | switch(chan->mode) { |
526 | case L2CAP_MODE_BASIC: | |
527 | break; | |
c13ffa62 | 528 | |
ee556f66 | 529 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
530 | __clear_retrans_timer(chan); |
531 | __clear_monitor_timer(chan); | |
532 | __clear_ack_timer(chan); | |
c13ffa62 | 533 | |
f1c6775b | 534 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 535 | |
3c588192 MM |
536 | l2cap_seq_list_free(&chan->srej_list); |
537 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
538 | |
539 | /* fall through */ | |
540 | ||
541 | case L2CAP_MODE_STREAMING: | |
542 | skb_queue_purge(&chan->tx_q); | |
543 | break; | |
c13ffa62 | 544 | } |
ee556f66 GP |
545 | |
546 | return; | |
0139418c MH |
547 | } |
548 | ||
0f852724 | 549 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
550 | { |
551 | struct l2cap_conn *conn = chan->conn; | |
552 | struct sock *sk = chan->sk; | |
553 | ||
e05dcc32 AE |
554 | BT_DBG("chan %p state %s sk %p", chan, |
555 | state_to_string(chan->state), sk); | |
4519de9a | 556 | |
89bc500e | 557 | switch (chan->state) { |
4519de9a | 558 | case BT_LISTEN: |
c0df7f6e AE |
559 | if (chan->ops->teardown) |
560 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
561 | break; |
562 | ||
563 | case BT_CONNECTED: | |
564 | case BT_CONFIG: | |
715ec005 | 565 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 566 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 567 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
568 | l2cap_send_disconn_req(conn, chan, reason); |
569 | } else | |
570 | l2cap_chan_del(chan, reason); | |
571 | break; | |
572 | ||
573 | case BT_CONNECT2: | |
715ec005 | 574 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
575 | conn->hcon->type == ACL_LINK) { |
576 | struct l2cap_conn_rsp rsp; | |
577 | __u16 result; | |
578 | ||
c5daa683 | 579 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
580 | result = L2CAP_CR_SEC_BLOCK; |
581 | else | |
582 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 583 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
584 | |
585 | rsp.scid = cpu_to_le16(chan->dcid); | |
586 | rsp.dcid = cpu_to_le16(chan->scid); | |
587 | rsp.result = cpu_to_le16(result); | |
ac73498c | 588 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
589 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
590 | sizeof(rsp), &rsp); | |
591 | } | |
592 | ||
593 | l2cap_chan_del(chan, reason); | |
594 | break; | |
595 | ||
596 | case BT_CONNECT: | |
597 | case BT_DISCONN: | |
598 | l2cap_chan_del(chan, reason); | |
599 | break; | |
600 | ||
601 | default: | |
c0df7f6e AE |
602 | if (chan->ops->teardown) |
603 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
604 | break; |
605 | } | |
606 | } | |
607 | ||
4343478f | 608 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 609 | { |
715ec005 | 610 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 611 | switch (chan->sec_level) { |
8556edd3 JH |
612 | case BT_SECURITY_HIGH: |
613 | return HCI_AT_DEDICATED_BONDING_MITM; | |
614 | case BT_SECURITY_MEDIUM: | |
615 | return HCI_AT_DEDICATED_BONDING; | |
616 | default: | |
617 | return HCI_AT_NO_BONDING; | |
618 | } | |
2983fd68 | 619 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
620 | if (chan->sec_level == BT_SECURITY_LOW) |
621 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 622 | |
4343478f | 623 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 624 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 625 | else |
8556edd3 | 626 | return HCI_AT_NO_BONDING; |
00ae4af9 | 627 | } else { |
4343478f | 628 | switch (chan->sec_level) { |
00ae4af9 | 629 | case BT_SECURITY_HIGH: |
8556edd3 | 630 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 631 | case BT_SECURITY_MEDIUM: |
8556edd3 | 632 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 633 | default: |
8556edd3 | 634 | return HCI_AT_NO_BONDING; |
00ae4af9 | 635 | } |
0684e5f9 | 636 | } |
8556edd3 JH |
637 | } |
638 | ||
639 | /* Service level security */ | |
d45fc423 | 640 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 641 | { |
8c1d787b | 642 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
643 | __u8 auth_type; |
644 | ||
4343478f | 645 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 646 | |
4343478f | 647 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
648 | } |
649 | ||
b5ad8b7f | 650 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
651 | { |
652 | u8 id; | |
653 | ||
654 | /* Get next available identificator. | |
655 | * 1 - 128 are used by kernel. | |
656 | * 129 - 199 are reserved. | |
657 | * 200 - 254 are used by utilities like l2ping, etc. | |
658 | */ | |
659 | ||
333055f2 | 660 | spin_lock(&conn->lock); |
4e8402a3 MH |
661 | |
662 | if (++conn->tx_ident > 128) | |
663 | conn->tx_ident = 1; | |
664 | ||
665 | id = conn->tx_ident; | |
666 | ||
333055f2 | 667 | spin_unlock(&conn->lock); |
4e8402a3 MH |
668 | |
669 | return id; | |
670 | } | |
671 | ||
4519de9a | 672 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
673 | { |
674 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 675 | u8 flags; |
4e8402a3 MH |
676 | |
677 | BT_DBG("code 0x%2.2x", code); | |
678 | ||
679 | if (!skb) | |
9a9c6a34 | 680 | return; |
4e8402a3 | 681 | |
e702112f AE |
682 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
683 | flags = ACL_START_NO_FLUSH; | |
684 | else | |
685 | flags = ACL_START; | |
686 | ||
14b12d0b | 687 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 688 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 689 | |
73d80deb LAD |
690 | hci_send_acl(conn->hchan, skb, flags); |
691 | } | |
692 | ||
693 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
694 | { | |
695 | struct hci_conn *hcon = chan->conn->hcon; | |
696 | u16 flags; | |
697 | ||
698 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
699 | skb->priority); | |
700 | ||
701 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
702 | lmp_no_flush_capable(hcon->hdev)) | |
703 | flags = ACL_START_NO_FLUSH; | |
704 | else | |
705 | flags = ACL_START; | |
14b12d0b | 706 | |
73d80deb LAD |
707 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
708 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
709 | } |
710 | ||
b76bbd66 MM |
711 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
712 | { | |
713 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
714 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
715 | ||
716 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
717 | /* S-Frame */ | |
718 | control->sframe = 1; | |
719 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
720 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
721 | ||
722 | control->sar = 0; | |
723 | control->txseq = 0; | |
724 | } else { | |
725 | /* I-Frame */ | |
726 | control->sframe = 0; | |
727 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
728 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
729 | ||
730 | control->poll = 0; | |
731 | control->super = 0; | |
732 | } | |
733 | } | |
734 | ||
b76bbd66 MM |
735 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
736 | { | |
737 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
738 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
739 | ||
740 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
741 | /* S-Frame */ | |
742 | control->sframe = 1; | |
743 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
744 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
745 | ||
746 | control->sar = 0; | |
747 | control->txseq = 0; | |
748 | } else { | |
749 | /* I-Frame */ | |
750 | control->sframe = 0; | |
751 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
752 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
753 | ||
754 | control->poll = 0; | |
755 | control->super = 0; | |
756 | } | |
757 | } | |
758 | ||
759 | static inline void __unpack_control(struct l2cap_chan *chan, | |
760 | struct sk_buff *skb) | |
761 | { | |
762 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
763 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
764 | &bt_cb(skb)->control); | |
cec8ab6e | 765 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
766 | } else { |
767 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
768 | &bt_cb(skb)->control); | |
cec8ab6e | 769 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
770 | } |
771 | } | |
772 | ||
b5c6aaed MM |
773 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
774 | { | |
775 | u32 packed; | |
776 | ||
777 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
778 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
779 | ||
780 | if (control->sframe) { | |
781 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
782 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
783 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
784 | } else { | |
785 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
786 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
787 | } | |
788 | ||
789 | return packed; | |
790 | } | |
791 | ||
792 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
793 | { | |
794 | u16 packed; | |
795 | ||
796 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
797 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
798 | ||
799 | if (control->sframe) { | |
800 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
801 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
802 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
803 | } else { | |
804 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
805 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
806 | } | |
807 | ||
808 | return packed; | |
809 | } | |
810 | ||
b76bbd66 MM |
811 | static inline void __pack_control(struct l2cap_chan *chan, |
812 | struct l2cap_ctrl *control, | |
813 | struct sk_buff *skb) | |
814 | { | |
815 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
816 | put_unaligned_le32(__pack_extended_control(control), | |
817 | skb->data + L2CAP_HDR_SIZE); | |
818 | } else { | |
819 | put_unaligned_le16(__pack_enhanced_control(control), | |
820 | skb->data + L2CAP_HDR_SIZE); | |
821 | } | |
822 | } | |
823 | ||
a67d7f6f MM |
824 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
825 | u32 control) | |
b5c6aaed MM |
826 | { |
827 | struct sk_buff *skb; | |
828 | struct l2cap_hdr *lh; | |
a67d7f6f | 829 | int hlen; |
b5c6aaed MM |
830 | |
831 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
832 | hlen = L2CAP_EXT_HDR_SIZE; | |
833 | else | |
834 | hlen = L2CAP_ENH_HDR_SIZE; | |
835 | ||
836 | if (chan->fcs == L2CAP_FCS_CRC16) | |
837 | hlen += L2CAP_FCS_SIZE; | |
838 | ||
a67d7f6f | 839 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 840 | |
b5c6aaed | 841 | if (!skb) |
a67d7f6f | 842 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
843 | |
844 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
845 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
846 | lh->cid = cpu_to_le16(chan->dcid); | |
847 | ||
a67d7f6f MM |
848 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
849 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
850 | else | |
851 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
852 | |
853 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 854 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
855 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
856 | } | |
857 | ||
858 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
859 | return skb; |
860 | } | |
861 | ||
862 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
863 | struct l2cap_ctrl *control) | |
864 | { | |
865 | struct sk_buff *skb; | |
866 | u32 control_field; | |
867 | ||
868 | BT_DBG("chan %p, control %p", chan, control); | |
869 | ||
870 | if (!control->sframe) | |
871 | return; | |
872 | ||
873 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
874 | !control->poll) | |
875 | control->final = 1; | |
876 | ||
877 | if (control->super == L2CAP_SUPER_RR) | |
878 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
879 | else if (control->super == L2CAP_SUPER_RNR) | |
880 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
881 | ||
882 | if (control->super != L2CAP_SUPER_SREJ) { | |
883 | chan->last_acked_seq = control->reqseq; | |
884 | __clear_ack_timer(chan); | |
885 | } | |
886 | ||
887 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
888 | control->final, control->poll, control->super); | |
889 | ||
890 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
891 | control_field = __pack_extended_control(control); | |
892 | else | |
893 | control_field = __pack_enhanced_control(control); | |
894 | ||
895 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
896 | if (!IS_ERR(skb)) | |
897 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
898 | } |
899 | ||
c9e3d5e0 | 900 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 901 | { |
c9e3d5e0 MM |
902 | struct l2cap_ctrl control; |
903 | ||
904 | BT_DBG("chan %p, poll %d", chan, poll); | |
905 | ||
906 | memset(&control, 0, sizeof(control)); | |
907 | control.sframe = 1; | |
908 | control.poll = poll; | |
909 | ||
910 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
911 | control.super = L2CAP_SUPER_RNR; | |
912 | else | |
913 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 914 | |
c9e3d5e0 MM |
915 | control.reqseq = chan->buffer_seq; |
916 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
917 | } |
918 | ||
b4450035 | 919 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 920 | { |
c1360a1c | 921 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
922 | } |
923 | ||
9b27f350 AE |
924 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
925 | { | |
926 | struct l2cap_conn *conn = chan->conn; | |
927 | struct l2cap_conn_req req; | |
928 | ||
929 | req.scid = cpu_to_le16(chan->scid); | |
930 | req.psm = chan->psm; | |
931 | ||
932 | chan->ident = l2cap_get_ident(conn); | |
933 | ||
934 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
935 | ||
936 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
937 | } | |
938 | ||
9f0caeb1 VCG |
939 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
940 | { | |
2827011f | 941 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
942 | chan->conf_state = 0; |
943 | __clear_chan_timer(chan); | |
944 | ||
54a59aa2 | 945 | chan->state = BT_CONNECTED; |
9f0caeb1 | 946 | |
54a59aa2 AE |
947 | if (chan->ops->ready) |
948 | chan->ops->ready(chan); | |
9f0caeb1 VCG |
949 | } |
950 | ||
fc7f8a7e | 951 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 952 | { |
8c1d787b | 953 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 954 | |
9f0caeb1 VCG |
955 | if (conn->hcon->type == LE_LINK) { |
956 | l2cap_chan_ready(chan); | |
957 | return; | |
958 | } | |
959 | ||
79d554a6 | 960 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
961 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
962 | return; | |
963 | ||
d45fc423 | 964 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
965 | __l2cap_no_conn_pending(chan)) |
966 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
967 | } else { |
968 | struct l2cap_info_req req; | |
ac73498c | 969 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
970 | |
971 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
972 | conn->info_ident = l2cap_get_ident(conn); | |
973 | ||
ba13ccd9 | 974 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
975 | |
976 | l2cap_send_cmd(conn, conn->info_ident, | |
977 | L2CAP_INFO_REQ, sizeof(req), &req); | |
978 | } | |
979 | } | |
980 | ||
cf6c2c0b GP |
981 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
982 | { | |
983 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 984 | if (!disable_ertm) |
cf6c2c0b GP |
985 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
986 | ||
987 | switch (mode) { | |
988 | case L2CAP_MODE_ERTM: | |
989 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
990 | case L2CAP_MODE_STREAMING: | |
991 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
992 | default: | |
993 | return 0x00; | |
994 | } | |
995 | } | |
996 | ||
4519de9a | 997 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 998 | { |
6be36555 | 999 | struct sock *sk = chan->sk; |
22121fc9 GP |
1000 | struct l2cap_disconn_req req; |
1001 | ||
c13ffa62 GP |
1002 | if (!conn) |
1003 | return; | |
1004 | ||
0c1bc5c6 | 1005 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1006 | __clear_retrans_timer(chan); |
1007 | __clear_monitor_timer(chan); | |
1008 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1009 | } |
1010 | ||
416fa752 AE |
1011 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1012 | __l2cap_state_change(chan, BT_DISCONN); | |
1013 | return; | |
1014 | } | |
1015 | ||
fe4128e0 GP |
1016 | req.dcid = cpu_to_le16(chan->dcid); |
1017 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1018 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1019 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1020 | |
6be36555 | 1021 | lock_sock(sk); |
0e587be7 | 1022 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1023 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1024 | release_sock(sk); |
22121fc9 GP |
1025 | } |
1026 | ||
1da177e4 | 1027 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1028 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1029 | { | |
3df91ea2 | 1030 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1031 | |
1032 | BT_DBG("conn %p", conn); | |
1033 | ||
3df91ea2 | 1034 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1035 | |
3df91ea2 | 1036 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1037 | struct sock *sk = chan->sk; |
baa7e1fa | 1038 | |
6be36555 | 1039 | l2cap_chan_lock(chan); |
4e8402a3 | 1040 | |
715ec005 | 1041 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1042 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1043 | continue; |
1044 | } | |
1045 | ||
89bc500e | 1046 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1047 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1048 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1049 | l2cap_chan_unlock(chan); |
47731de7 GP |
1050 | continue; |
1051 | } | |
79d554a6 | 1052 | |
c1360a1c GP |
1053 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1054 | && test_bit(CONF_STATE2_DEVICE, | |
1055 | &chan->conf_state)) { | |
89bc500e | 1056 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1057 | l2cap_chan_unlock(chan); |
47731de7 | 1058 | continue; |
b1235d79 | 1059 | } |
47731de7 | 1060 | |
9b27f350 | 1061 | l2cap_send_conn_req(chan); |
47731de7 | 1062 | |
89bc500e | 1063 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1064 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1065 | char buf[128]; |
fe4128e0 GP |
1066 | rsp.scid = cpu_to_le16(chan->dcid); |
1067 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1068 | |
d45fc423 | 1069 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1070 | lock_sock(sk); |
c5daa683 GP |
1071 | if (test_bit(BT_SK_DEFER_SETUP, |
1072 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1073 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1074 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1075 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1076 | if (parent) |
1077 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1078 | |
1079 | } else { | |
0e587be7 | 1080 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1081 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1082 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1083 | } |
6be36555 | 1084 | release_sock(sk); |
79d554a6 | 1085 | } else { |
ac73498c AE |
1086 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1087 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1088 | } |
1089 | ||
fc7f8a7e GP |
1090 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1091 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1092 | |
c1360a1c | 1093 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1094 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1095 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1096 | continue; |
1097 | } | |
1098 | ||
c1360a1c | 1099 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1100 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1101 | l2cap_build_conf_req(chan, buf), buf); |
1102 | chan->num_conf_req++; | |
4e8402a3 MH |
1103 | } |
1104 | ||
6be36555 | 1105 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1106 | } |
1107 | ||
3df91ea2 | 1108 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1109 | } |
1110 | ||
c2287681 | 1111 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1112 | * Returns closest match, locked. |
1113 | */ | |
d9b88702 | 1114 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1115 | bdaddr_t *src, |
1116 | bdaddr_t *dst) | |
b62f328b | 1117 | { |
23691d75 | 1118 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1119 | |
23691d75 | 1120 | read_lock(&chan_list_lock); |
b62f328b | 1121 | |
23691d75 GP |
1122 | list_for_each_entry(c, &chan_list, global_l) { |
1123 | struct sock *sk = c->sk; | |
fe4128e0 | 1124 | |
89bc500e | 1125 | if (state && c->state != state) |
b62f328b VT |
1126 | continue; |
1127 | ||
23691d75 | 1128 | if (c->scid == cid) { |
c2287681 IY |
1129 | int src_match, dst_match; |
1130 | int src_any, dst_any; | |
1131 | ||
b62f328b | 1132 | /* Exact match. */ |
c2287681 IY |
1133 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1134 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1135 | if (src_match && dst_match) { | |
23691d75 GP |
1136 | read_unlock(&chan_list_lock); |
1137 | return c; | |
1138 | } | |
b62f328b VT |
1139 | |
1140 | /* Closest match */ | |
c2287681 IY |
1141 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1142 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1143 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1144 | (src_any && dst_any)) | |
23691d75 | 1145 | c1 = c; |
b62f328b VT |
1146 | } |
1147 | } | |
280f294f | 1148 | |
23691d75 | 1149 | read_unlock(&chan_list_lock); |
b62f328b | 1150 | |
23691d75 | 1151 | return c1; |
b62f328b VT |
1152 | } |
1153 | ||
1154 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1155 | { | |
c916fbe4 | 1156 | struct sock *parent, *sk; |
23691d75 | 1157 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1158 | |
1159 | BT_DBG(""); | |
1160 | ||
1161 | /* Check if we have socket listening on cid */ | |
23691d75 | 1162 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1163 | conn->src, conn->dst); |
23691d75 | 1164 | if (!pchan) |
b62f328b VT |
1165 | return; |
1166 | ||
23691d75 GP |
1167 | parent = pchan->sk; |
1168 | ||
aa2ac881 | 1169 | lock_sock(parent); |
62f3a2cf | 1170 | |
80b98027 | 1171 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1172 | if (!chan) |
b62f328b VT |
1173 | goto clean; |
1174 | ||
80808e43 | 1175 | sk = chan->sk; |
5d41ce1d | 1176 | |
b62f328b VT |
1177 | hci_conn_hold(conn->hcon); |
1178 | ||
b62f328b VT |
1179 | bacpy(&bt_sk(sk)->src, conn->src); |
1180 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1181 | ||
d1010240 GP |
1182 | bt_accept_enqueue(parent, sk); |
1183 | ||
3d57dc68 | 1184 | l2cap_chan_add(conn, chan); |
48454079 | 1185 | |
6754e0df | 1186 | l2cap_chan_ready(chan); |
b62f328b | 1187 | |
b62f328b | 1188 | clean: |
aa2ac881 | 1189 | release_sock(parent); |
b62f328b VT |
1190 | } |
1191 | ||
4e8402a3 MH |
1192 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1193 | { | |
48454079 | 1194 | struct l2cap_chan *chan; |
4e8402a3 | 1195 | |
79d554a6 | 1196 | BT_DBG("conn %p", conn); |
4e8402a3 | 1197 | |
b62f328b VT |
1198 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1199 | l2cap_le_conn_ready(conn); | |
1200 | ||
160dc6ac VCG |
1201 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1202 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1203 | ||
3df91ea2 | 1204 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1205 | |
3df91ea2 | 1206 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1207 | |
6be36555 | 1208 | l2cap_chan_lock(chan); |
4e8402a3 | 1209 | |
416fa752 AE |
1210 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1211 | l2cap_chan_unlock(chan); | |
1212 | continue; | |
1213 | } | |
1214 | ||
63128451 | 1215 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1216 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1217 | l2cap_chan_ready(chan); |
acd7d370 | 1218 | |
63128451 | 1219 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1220 | struct sock *sk = chan->sk; |
c9b66675 | 1221 | __clear_chan_timer(chan); |
6be36555 | 1222 | lock_sock(sk); |
0e587be7 | 1223 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1224 | sk->sk_state_change(sk); |
6be36555 | 1225 | release_sock(sk); |
b501d6a1 | 1226 | |
89bc500e | 1227 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1228 | l2cap_do_start(chan); |
4e8402a3 | 1229 | |
6be36555 | 1230 | l2cap_chan_unlock(chan); |
4e8402a3 | 1231 | } |
79d554a6 | 1232 | |
3df91ea2 | 1233 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1234 | } |
1235 | ||
1236 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1237 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1238 | { | |
48454079 | 1239 | struct l2cap_chan *chan; |
4e8402a3 MH |
1240 | |
1241 | BT_DBG("conn %p", conn); | |
1242 | ||
3df91ea2 | 1243 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1244 | |
3df91ea2 | 1245 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1246 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1247 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1248 | } |
1249 | ||
3df91ea2 | 1250 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1251 | } |
1252 | ||
f878fcad | 1253 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1254 | { |
f878fcad | 1255 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1256 | info_timer.work); |
4e8402a3 | 1257 | |
984947dc | 1258 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1259 | conn->info_ident = 0; |
984947dc | 1260 | |
4e8402a3 MH |
1261 | l2cap_conn_start(conn); |
1262 | } | |
1263 | ||
5d3de7df VCG |
1264 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1265 | { | |
1266 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1267 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1268 | |
1269 | if (!conn) | |
1270 | return; | |
1271 | ||
1272 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1273 | ||
1274 | kfree_skb(conn->rx_skb); | |
1275 | ||
3df91ea2 AE |
1276 | mutex_lock(&conn->chan_lock); |
1277 | ||
5d3de7df VCG |
1278 | /* Kill channels */ |
1279 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1280 | l2cap_chan_hold(chan); |
6be36555 AE |
1281 | l2cap_chan_lock(chan); |
1282 | ||
5d3de7df | 1283 | l2cap_chan_del(chan, err); |
6be36555 AE |
1284 | |
1285 | l2cap_chan_unlock(chan); | |
1286 | ||
80b98027 | 1287 | chan->ops->close(chan); |
61d6ef3e | 1288 | l2cap_chan_put(chan); |
5d3de7df VCG |
1289 | } |
1290 | ||
3df91ea2 AE |
1291 | mutex_unlock(&conn->chan_lock); |
1292 | ||
73d80deb LAD |
1293 | hci_chan_del(conn->hchan); |
1294 | ||
5d3de7df | 1295 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1296 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1297 | |
51a8efd7 | 1298 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1299 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1300 | smp_chan_destroy(conn); |
d26a2345 | 1301 | } |
5d3de7df VCG |
1302 | |
1303 | hcon->l2cap_data = NULL; | |
1304 | kfree(conn); | |
1305 | } | |
1306 | ||
6c9d42a1 | 1307 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1308 | { |
6c9d42a1 GP |
1309 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1310 | security_timer.work); | |
5d3de7df VCG |
1311 | |
1312 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1313 | } | |
1314 | ||
1da177e4 LT |
1315 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1316 | { | |
0139418c | 1317 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1318 | struct hci_chan *hchan; |
1da177e4 | 1319 | |
0139418c | 1320 | if (conn || status) |
1da177e4 LT |
1321 | return conn; |
1322 | ||
73d80deb LAD |
1323 | hchan = hci_chan_create(hcon); |
1324 | if (!hchan) | |
1325 | return NULL; | |
1326 | ||
0139418c | 1327 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1328 | if (!conn) { |
1329 | hci_chan_del(hchan); | |
1da177e4 | 1330 | return NULL; |
73d80deb | 1331 | } |
1da177e4 LT |
1332 | |
1333 | hcon->l2cap_data = conn; | |
1334 | conn->hcon = hcon; | |
73d80deb | 1335 | conn->hchan = hchan; |
1da177e4 | 1336 | |
73d80deb | 1337 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1338 | |
acd7d370 VT |
1339 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1340 | conn->mtu = hcon->hdev->le_mtu; | |
1341 | else | |
1342 | conn->mtu = hcon->hdev->acl_mtu; | |
1343 | ||
1da177e4 LT |
1344 | conn->src = &hcon->hdev->bdaddr; |
1345 | conn->dst = &hcon->dst; | |
1346 | ||
4e8402a3 MH |
1347 | conn->feat_mask = 0; |
1348 | ||
1da177e4 | 1349 | spin_lock_init(&conn->lock); |
3df91ea2 | 1350 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1351 | |
1352 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1353 | |
5d3de7df | 1354 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1355 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1356 | else |
030013d8 | 1357 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1358 | |
9f5a0d7b | 1359 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1360 | |
1da177e4 LT |
1361 | return conn; |
1362 | } | |
1363 | ||
1da177e4 | 1364 | /* ---- Socket interface ---- */ |
1da177e4 | 1365 | |
c2287681 | 1366 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1367 | * Returns closest match. |
1368 | */ | |
c2287681 IY |
1369 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1370 | bdaddr_t *src, | |
1371 | bdaddr_t *dst) | |
1da177e4 | 1372 | { |
23691d75 | 1373 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1374 | |
23691d75 | 1375 | read_lock(&chan_list_lock); |
e0f0cb56 | 1376 | |
23691d75 GP |
1377 | list_for_each_entry(c, &chan_list, global_l) { |
1378 | struct sock *sk = c->sk; | |
fe4128e0 | 1379 | |
89bc500e | 1380 | if (state && c->state != state) |
1da177e4 LT |
1381 | continue; |
1382 | ||
23691d75 | 1383 | if (c->psm == psm) { |
c2287681 IY |
1384 | int src_match, dst_match; |
1385 | int src_any, dst_any; | |
1386 | ||
1da177e4 | 1387 | /* Exact match. */ |
c2287681 IY |
1388 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1389 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1390 | if (src_match && dst_match) { | |
a7567b20 | 1391 | read_unlock(&chan_list_lock); |
23691d75 GP |
1392 | return c; |
1393 | } | |
1da177e4 LT |
1394 | |
1395 | /* Closest match */ | |
c2287681 IY |
1396 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1397 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1398 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1399 | (src_any && dst_any)) | |
23691d75 | 1400 | c1 = c; |
1da177e4 LT |
1401 | } |
1402 | } | |
1da177e4 | 1403 | |
23691d75 | 1404 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1405 | |
23691d75 | 1406 | return c1; |
1da177e4 LT |
1407 | } |
1408 | ||
8e9f9892 AG |
1409 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1410 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1411 | { |
5d41ce1d | 1412 | struct sock *sk = chan->sk; |
1da177e4 | 1413 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1414 | struct l2cap_conn *conn; |
1415 | struct hci_conn *hcon; | |
1416 | struct hci_dev *hdev; | |
09ab6f4c | 1417 | __u8 auth_type; |
44d0e48e | 1418 | int err; |
1da177e4 | 1419 | |
8e9f9892 AG |
1420 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1421 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1422 | |
af05b30b GP |
1423 | hdev = hci_get_route(dst, src); |
1424 | if (!hdev) | |
1da177e4 LT |
1425 | return -EHOSTUNREACH; |
1426 | ||
09fd0de5 | 1427 | hci_dev_lock(hdev); |
1da177e4 | 1428 | |
6be36555 | 1429 | l2cap_chan_lock(chan); |
03a00194 GP |
1430 | |
1431 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1432 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1433 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1434 | err = -EINVAL; | |
1435 | goto done; | |
1436 | } | |
1437 | ||
1438 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1439 | err = -EINVAL; | |
1440 | goto done; | |
1441 | } | |
1442 | ||
1443 | switch (chan->mode) { | |
1444 | case L2CAP_MODE_BASIC: | |
1445 | break; | |
1446 | case L2CAP_MODE_ERTM: | |
1447 | case L2CAP_MODE_STREAMING: | |
1448 | if (!disable_ertm) | |
1449 | break; | |
1450 | /* fall through */ | |
1451 | default: | |
1452 | err = -ENOTSUPP; | |
1453 | goto done; | |
1454 | } | |
1455 | ||
0797e01d | 1456 | switch (chan->state) { |
03a00194 GP |
1457 | case BT_CONNECT: |
1458 | case BT_CONNECT2: | |
1459 | case BT_CONFIG: | |
1460 | /* Already connecting */ | |
1461 | err = 0; | |
1462 | goto done; | |
1463 | ||
1464 | case BT_CONNECTED: | |
1465 | /* Already connected */ | |
1466 | err = -EISCONN; | |
1467 | goto done; | |
1468 | ||
1469 | case BT_OPEN: | |
1470 | case BT_BOUND: | |
1471 | /* Can connect */ | |
1472 | break; | |
1473 | ||
1474 | default: | |
1475 | err = -EBADFD; | |
1476 | goto done; | |
1477 | } | |
1478 | ||
1479 | /* Set destination address and psm */ | |
0797e01d | 1480 | lock_sock(sk); |
9219b2a0 | 1481 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1482 | release_sock(sk); |
1483 | ||
03a00194 GP |
1484 | chan->psm = psm; |
1485 | chan->dcid = cid; | |
1da177e4 | 1486 | |
4343478f | 1487 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1488 | |
fe4128e0 | 1489 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1490 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1491 | chan->sec_level, auth_type); |
acd7d370 | 1492 | else |
8e9f9892 | 1493 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1494 | chan->sec_level, auth_type); |
acd7d370 | 1495 | |
30e76272 VT |
1496 | if (IS_ERR(hcon)) { |
1497 | err = PTR_ERR(hcon); | |
1da177e4 | 1498 | goto done; |
30e76272 | 1499 | } |
1da177e4 LT |
1500 | |
1501 | conn = l2cap_conn_add(hcon, 0); | |
1502 | if (!conn) { | |
1503 | hci_conn_put(hcon); | |
30e76272 | 1504 | err = -ENOMEM; |
1da177e4 LT |
1505 | goto done; |
1506 | } | |
1507 | ||
9f0caeb1 VCG |
1508 | if (hcon->type == LE_LINK) { |
1509 | err = 0; | |
1510 | ||
1511 | if (!list_empty(&conn->chan_l)) { | |
1512 | err = -EBUSY; | |
1513 | hci_conn_put(hcon); | |
1514 | } | |
1515 | ||
1516 | if (err) | |
1517 | goto done; | |
1518 | } | |
1519 | ||
1da177e4 LT |
1520 | /* Update source addr of the socket */ |
1521 | bacpy(src, conn->src); | |
1522 | ||
6be36555 | 1523 | l2cap_chan_unlock(chan); |
48454079 | 1524 | l2cap_chan_add(conn, chan); |
6be36555 | 1525 | l2cap_chan_lock(chan); |
48454079 | 1526 | |
6be36555 | 1527 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1528 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1529 | |
1530 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1531 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1532 | __clear_chan_timer(chan); |
d45fc423 | 1533 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1534 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1535 | } else |
fc7f8a7e | 1536 | l2cap_do_start(chan); |
1da177e4 LT |
1537 | } |
1538 | ||
30e76272 VT |
1539 | err = 0; |
1540 | ||
1da177e4 | 1541 | done: |
6be36555 | 1542 | l2cap_chan_unlock(chan); |
09fd0de5 | 1543 | hci_dev_unlock(hdev); |
1da177e4 LT |
1544 | hci_dev_put(hdev); |
1545 | return err; | |
1546 | } | |
1547 | ||
dcba0dba | 1548 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1549 | { |
8c1d787b | 1550 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1551 | DECLARE_WAITQUEUE(wait, current); |
1552 | int err = 0; | |
1553 | int timeo = HZ/5; | |
1554 | ||
2b0b05dd | 1555 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1556 | set_current_state(TASK_INTERRUPTIBLE); |
1557 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1558 | if (!timeo) |
1559 | timeo = HZ/5; | |
1560 | ||
1561 | if (signal_pending(current)) { | |
1562 | err = sock_intr_errno(timeo); | |
1563 | break; | |
1564 | } | |
1565 | ||
1566 | release_sock(sk); | |
1567 | timeo = schedule_timeout(timeo); | |
1568 | lock_sock(sk); | |
a71a0cf4 | 1569 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1570 | |
1571 | err = sock_error(sk); | |
1572 | if (err) | |
1573 | break; | |
1574 | } | |
1575 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1576 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1577 | return err; |
1578 | } | |
1579 | ||
721c4181 | 1580 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1581 | { |
721c4181 | 1582 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1583 | monitor_timer.work); |
e90bac06 | 1584 | |
525cd185 | 1585 | BT_DBG("chan %p", chan); |
0e98958d | 1586 | |
6be36555 AE |
1587 | l2cap_chan_lock(chan); |
1588 | ||
80909e04 | 1589 | if (!chan->conn) { |
6be36555 | 1590 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1591 | l2cap_chan_put(chan); |
e90bac06 GP |
1592 | return; |
1593 | } | |
1594 | ||
401bb1f7 | 1595 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1596 | |
6be36555 | 1597 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1598 | l2cap_chan_put(chan); |
e90bac06 GP |
1599 | } |
1600 | ||
721c4181 | 1601 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1602 | { |
721c4181 | 1603 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1604 | retrans_timer.work); |
e90bac06 | 1605 | |
49208c9c | 1606 | BT_DBG("chan %p", chan); |
0e98958d | 1607 | |
6be36555 AE |
1608 | l2cap_chan_lock(chan); |
1609 | ||
80909e04 MM |
1610 | if (!chan->conn) { |
1611 | l2cap_chan_unlock(chan); | |
1612 | l2cap_chan_put(chan); | |
1613 | return; | |
1614 | } | |
6be36555 | 1615 | |
401bb1f7 | 1616 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1617 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1618 | l2cap_chan_put(chan); |
e90bac06 GP |
1619 | } |
1620 | ||
d660366d GP |
1621 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1622 | struct sk_buff_head *skbs) | |
6840ed07 | 1623 | { |
ccbb84af | 1624 | struct sk_buff *skb; |
3733937d | 1625 | struct l2cap_ctrl *control; |
6840ed07 | 1626 | |
3733937d MM |
1627 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1628 | ||
3733937d MM |
1629 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1630 | ||
1631 | while (!skb_queue_empty(&chan->tx_q)) { | |
1632 | ||
1633 | skb = skb_dequeue(&chan->tx_q); | |
1634 | ||
1635 | bt_cb(skb)->control.retries = 1; | |
1636 | control = &bt_cb(skb)->control; | |
1637 | ||
1638 | control->reqseq = 0; | |
1639 | control->txseq = chan->next_tx_seq; | |
1640 | ||
1641 | __pack_control(chan, control, skb); | |
6840ed07 | 1642 | |
47d1ec61 | 1643 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1644 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1645 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1646 | } |
1647 | ||
4343478f | 1648 | l2cap_do_send(chan, skb); |
6840ed07 | 1649 | |
3733937d MM |
1650 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1651 | ||
836be934 | 1652 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1653 | chan->frames_sent++; |
6840ed07 | 1654 | } |
6840ed07 GP |
1655 | } |
1656 | ||
67c9e840 | 1657 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1658 | { |
1659 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1660 | struct l2cap_ctrl *control; |
1661 | int sent = 0; | |
1662 | ||
1663 | BT_DBG("chan %p", chan); | |
1c2acffb | 1664 | |
89bc500e | 1665 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1666 | return -ENOTCONN; |
e90bac06 | 1667 | |
94122bbe MM |
1668 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1669 | return 0; | |
1670 | ||
18a48e76 MM |
1671 | while (chan->tx_send_head && |
1672 | chan->unacked_frames < chan->remote_tx_win && | |
1673 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1674 | |
18a48e76 | 1675 | skb = chan->tx_send_head; |
e90bac06 | 1676 | |
18a48e76 MM |
1677 | bt_cb(skb)->control.retries = 1; |
1678 | control = &bt_cb(skb)->control; | |
95ffa978 | 1679 | |
e2ab4353 | 1680 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1681 | control->final = 1; |
e2ab4353 | 1682 | |
18a48e76 MM |
1683 | control->reqseq = chan->buffer_seq; |
1684 | chan->last_acked_seq = chan->buffer_seq; | |
1685 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1686 | |
18a48e76 | 1687 | __pack_control(chan, control, skb); |
e90bac06 | 1688 | |
47d1ec61 | 1689 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1690 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1691 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1692 | } |
1693 | ||
18a48e76 MM |
1694 | /* Clone after data has been modified. Data is assumed to be |
1695 | read-only (for locking purposes) on cloned sk_buffs. | |
1696 | */ | |
1697 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1698 | |
18a48e76 MM |
1699 | if (!tx_skb) |
1700 | break; | |
1c2acffb | 1701 | |
18a48e76 | 1702 | __set_retrans_timer(chan); |
836be934 AE |
1703 | |
1704 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1705 | chan->unacked_frames++; |
6a026610 | 1706 | chan->frames_sent++; |
18a48e76 | 1707 | sent++; |
1c2acffb | 1708 | |
58d35f87 GP |
1709 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1710 | chan->tx_send_head = NULL; | |
1c2acffb | 1711 | else |
58d35f87 | 1712 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1713 | |
1714 | l2cap_do_send(chan, tx_skb); | |
1715 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1716 | } |
1717 | ||
18a48e76 MM |
1718 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1719 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1720 | ||
1721 | return sent; | |
9e917af1 GP |
1722 | } |
1723 | ||
e1fbd4c1 MM |
1724 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1725 | { | |
1726 | struct l2cap_ctrl control; | |
1727 | struct sk_buff *skb; | |
1728 | struct sk_buff *tx_skb; | |
1729 | u16 seq; | |
1730 | ||
1731 | BT_DBG("chan %p", chan); | |
1732 | ||
1733 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1734 | return; | |
1735 | ||
1736 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1737 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1738 | ||
1739 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1740 | if (!skb) { | |
1741 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1742 | seq); | |
1743 | continue; | |
1744 | } | |
1745 | ||
1746 | bt_cb(skb)->control.retries++; | |
1747 | control = bt_cb(skb)->control; | |
1748 | ||
1749 | if (chan->max_tx != 0 && | |
1750 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1751 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1752 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1753 | l2cap_seq_list_clear(&chan->retrans_list); | |
1754 | break; | |
1755 | } | |
1756 | ||
1757 | control.reqseq = chan->buffer_seq; | |
1758 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1759 | control.final = 1; | |
1760 | else | |
1761 | control.final = 0; | |
1762 | ||
1763 | if (skb_cloned(skb)) { | |
1764 | /* Cloned sk_buffs are read-only, so we need a | |
1765 | * writeable copy | |
1766 | */ | |
1767 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1768 | } else { | |
1769 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1770 | } | |
1771 | ||
1772 | if (!tx_skb) { | |
1773 | l2cap_seq_list_clear(&chan->retrans_list); | |
1774 | break; | |
1775 | } | |
1776 | ||
1777 | /* Update skb contents */ | |
1778 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1779 | put_unaligned_le32(__pack_extended_control(&control), | |
1780 | tx_skb->data + L2CAP_HDR_SIZE); | |
1781 | } else { | |
1782 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1783 | tx_skb->data + L2CAP_HDR_SIZE); | |
1784 | } | |
1785 | ||
1786 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1787 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1788 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1789 | L2CAP_FCS_SIZE)); | |
1790 | } | |
1791 | ||
1792 | l2cap_do_send(chan, tx_skb); | |
1793 | ||
1794 | BT_DBG("Resent txseq %d", control.txseq); | |
1795 | ||
1796 | chan->last_acked_seq = chan->buffer_seq; | |
1797 | } | |
1798 | } | |
1799 | ||
f80842a8 MM |
1800 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1801 | struct l2cap_ctrl *control) | |
1802 | { | |
1803 | BT_DBG("chan %p, control %p", chan, control); | |
1804 | ||
1805 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1806 | l2cap_ertm_resend(chan); | |
1807 | } | |
1808 | ||
d2a7ac5d MM |
1809 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1810 | struct l2cap_ctrl *control) | |
1811 | { | |
e1fbd4c1 MM |
1812 | struct sk_buff *skb; |
1813 | ||
1814 | BT_DBG("chan %p, control %p", chan, control); | |
1815 | ||
1816 | if (control->poll) | |
1817 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1818 | ||
1819 | l2cap_seq_list_clear(&chan->retrans_list); | |
1820 | ||
1821 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1822 | return; | |
1823 | ||
1824 | if (chan->unacked_frames) { | |
1825 | skb_queue_walk(&chan->tx_q, skb) { | |
1826 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1827 | skb == chan->tx_send_head) | |
1828 | break; | |
1829 | } | |
1830 | ||
1831 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1832 | if (skb == chan->tx_send_head) | |
1833 | break; | |
1834 | ||
1835 | l2cap_seq_list_append(&chan->retrans_list, | |
1836 | bt_cb(skb)->control.txseq); | |
1837 | } | |
1838 | ||
1839 | l2cap_ertm_resend(chan); | |
1840 | } | |
d2a7ac5d MM |
1841 | } |
1842 | ||
0a0aba42 | 1843 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1844 | { |
0a0aba42 MM |
1845 | struct l2cap_ctrl control; |
1846 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1847 | chan->last_acked_seq); | |
1848 | int threshold; | |
9e917af1 | 1849 | |
0a0aba42 MM |
1850 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1851 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1852 | |
0a0aba42 MM |
1853 | memset(&control, 0, sizeof(control)); |
1854 | control.sframe = 1; | |
dfc909be | 1855 | |
0a0aba42 MM |
1856 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1857 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1858 | __clear_ack_timer(chan); | |
1859 | control.super = L2CAP_SUPER_RNR; | |
1860 | control.reqseq = chan->buffer_seq; | |
1861 | l2cap_send_sframe(chan, &control); | |
1862 | } else { | |
1863 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1864 | l2cap_ertm_send(chan); | |
1865 | /* If any i-frames were sent, they included an ack */ | |
1866 | if (chan->buffer_seq == chan->last_acked_seq) | |
1867 | frames_to_ack = 0; | |
1868 | } | |
dfc909be | 1869 | |
0a0aba42 MM |
1870 | /* Ack now if the tx window is 3/4ths full. |
1871 | * Calculate without mul or div | |
1872 | */ | |
1873 | threshold = chan->tx_win; | |
1874 | threshold += threshold << 1; | |
1875 | threshold >>= 2; | |
1876 | ||
1877 | BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack, | |
1878 | threshold); | |
1879 | ||
1880 | if (frames_to_ack >= threshold) { | |
1881 | __clear_ack_timer(chan); | |
1882 | control.super = L2CAP_SUPER_RR; | |
1883 | control.reqseq = chan->buffer_seq; | |
1884 | l2cap_send_sframe(chan, &control); | |
1885 | frames_to_ack = 0; | |
1886 | } | |
1c2acffb | 1887 | |
0a0aba42 MM |
1888 | if (frames_to_ack) |
1889 | __set_ack_timer(chan); | |
1890 | } | |
b17e73bb SJ |
1891 | } |
1892 | ||
04124681 GP |
1893 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1894 | struct msghdr *msg, int len, | |
1895 | int count, struct sk_buff *skb) | |
1c2acffb | 1896 | { |
0952a57a | 1897 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1898 | struct sk_buff **frag; |
90338947 | 1899 | int sent = 0; |
1da177e4 | 1900 | |
59203a21 | 1901 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1902 | return -EFAULT; |
1da177e4 LT |
1903 | |
1904 | sent += count; | |
1905 | len -= count; | |
1906 | ||
1907 | /* Continuation fragments (no L2CAP header) */ | |
1908 | frag = &skb_shinfo(skb)->frag_list; | |
1909 | while (len) { | |
fbe00700 GP |
1910 | struct sk_buff *tmp; |
1911 | ||
1da177e4 LT |
1912 | count = min_t(unsigned int, conn->mtu, len); |
1913 | ||
fbe00700 GP |
1914 | tmp = chan->ops->alloc_skb(chan, count, |
1915 | msg->msg_flags & MSG_DONTWAIT); | |
1916 | if (IS_ERR(tmp)) | |
1917 | return PTR_ERR(tmp); | |
1918 | ||
1919 | *frag = tmp; | |
2f7719ce | 1920 | |
1c2acffb GP |
1921 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1922 | return -EFAULT; | |
1da177e4 | 1923 | |
5e59b791 LAD |
1924 | (*frag)->priority = skb->priority; |
1925 | ||
1da177e4 LT |
1926 | sent += count; |
1927 | len -= count; | |
1928 | ||
2d0ed3d5 GP |
1929 | skb->len += (*frag)->len; |
1930 | skb->data_len += (*frag)->len; | |
1931 | ||
1da177e4 LT |
1932 | frag = &(*frag)->next; |
1933 | } | |
1da177e4 LT |
1934 | |
1935 | return sent; | |
1c2acffb | 1936 | } |
1da177e4 | 1937 | |
5e59b791 LAD |
1938 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1939 | struct msghdr *msg, size_t len, | |
1940 | u32 priority) | |
1c2acffb | 1941 | { |
8c1d787b | 1942 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1943 | struct sk_buff *skb; |
03a51213 | 1944 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1945 | struct l2cap_hdr *lh; |
1946 | ||
6d5922b0 | 1947 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1948 | |
1949 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1950 | |
1951 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1952 | msg->msg_flags & MSG_DONTWAIT); |
1953 | if (IS_ERR(skb)) | |
1954 | return skb; | |
1c2acffb | 1955 | |
5e59b791 LAD |
1956 | skb->priority = priority; |
1957 | ||
1c2acffb GP |
1958 | /* Create L2CAP header */ |
1959 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1960 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1961 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1962 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1963 | |
0952a57a | 1964 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1965 | if (unlikely(err < 0)) { |
1966 | kfree_skb(skb); | |
1967 | return ERR_PTR(err); | |
1968 | } | |
1969 | return skb; | |
1970 | } | |
1971 | ||
5e59b791 LAD |
1972 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1973 | struct msghdr *msg, size_t len, | |
1974 | u32 priority) | |
1c2acffb | 1975 | { |
8c1d787b | 1976 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1977 | struct sk_buff *skb; |
f2ba7fae | 1978 | int err, count; |
1c2acffb GP |
1979 | struct l2cap_hdr *lh; |
1980 | ||
6d5922b0 | 1981 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1982 | |
f2ba7fae | 1983 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1984 | |
f2ba7fae | 1985 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1986 | msg->msg_flags & MSG_DONTWAIT); |
1987 | if (IS_ERR(skb)) | |
1988 | return skb; | |
1c2acffb | 1989 | |
5e59b791 LAD |
1990 | skb->priority = priority; |
1991 | ||
1c2acffb GP |
1992 | /* Create L2CAP header */ |
1993 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1994 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1995 | lh->len = cpu_to_le16(len); |
1c2acffb | 1996 | |
0952a57a | 1997 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1998 | if (unlikely(err < 0)) { |
1999 | kfree_skb(skb); | |
2000 | return ERR_PTR(err); | |
2001 | } | |
2002 | return skb; | |
2003 | } | |
2004 | ||
ab0ff76d LAD |
2005 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
2006 | struct msghdr *msg, size_t len, | |
94122bbe | 2007 | u16 sdulen) |
1c2acffb | 2008 | { |
8c1d787b | 2009 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2010 | struct sk_buff *skb; |
e4ca6d98 | 2011 | int err, count, hlen; |
1c2acffb GP |
2012 | struct l2cap_hdr *lh; |
2013 | ||
6d5922b0 | 2014 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2015 | |
0ee0d208 GP |
2016 | if (!conn) |
2017 | return ERR_PTR(-ENOTCONN); | |
2018 | ||
e4ca6d98 AE |
2019 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2020 | hlen = L2CAP_EXT_HDR_SIZE; | |
2021 | else | |
2022 | hlen = L2CAP_ENH_HDR_SIZE; | |
2023 | ||
c74e560c | 2024 | if (sdulen) |
03a51213 | 2025 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2026 | |
47d1ec61 | 2027 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2028 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2029 | |
1c2acffb | 2030 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2031 | |
2032 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2033 | msg->msg_flags & MSG_DONTWAIT); |
2034 | if (IS_ERR(skb)) | |
2035 | return skb; | |
1c2acffb GP |
2036 | |
2037 | /* Create L2CAP header */ | |
2038 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2039 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2040 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2041 | |
18a48e76 MM |
2042 | /* Control header is populated later */ |
2043 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2044 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2045 | else | |
2046 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2047 | |
c74e560c | 2048 | if (sdulen) |
03a51213 | 2049 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2050 | |
0952a57a | 2051 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2052 | if (unlikely(err < 0)) { |
2053 | kfree_skb(skb); | |
2054 | return ERR_PTR(err); | |
2055 | } | |
e90bac06 | 2056 | |
18a48e76 | 2057 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2058 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2059 | return skb; |
1da177e4 LT |
2060 | } |
2061 | ||
94122bbe MM |
2062 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2063 | struct sk_buff_head *seg_queue, | |
2064 | struct msghdr *msg, size_t len) | |
c74e560c | 2065 | { |
c74e560c | 2066 | struct sk_buff *skb; |
94122bbe MM |
2067 | u16 sdu_len; |
2068 | size_t pdu_len; | |
2069 | int err = 0; | |
2070 | u8 sar; | |
c74e560c | 2071 | |
94122bbe | 2072 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2073 | |
94122bbe MM |
2074 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2075 | * so fragmented skbs are not used. The HCI layer's handling | |
2076 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2077 | */ | |
c74e560c | 2078 | |
94122bbe MM |
2079 | /* PDU size is derived from the HCI MTU */ |
2080 | pdu_len = chan->conn->mtu; | |
c74e560c | 2081 | |
94122bbe MM |
2082 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2083 | ||
2084 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2085 | if (chan->fcs) |
2086 | pdu_len -= L2CAP_FCS_SIZE; | |
2087 | ||
2088 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2089 | pdu_len -= L2CAP_EXT_HDR_SIZE; | |
2090 | else | |
2091 | pdu_len -= L2CAP_ENH_HDR_SIZE; | |
94122bbe MM |
2092 | |
2093 | /* Remote device may have requested smaller PDUs */ | |
2094 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2095 | ||
2096 | if (len <= pdu_len) { | |
2097 | sar = L2CAP_SAR_UNSEGMENTED; | |
2098 | sdu_len = 0; | |
2099 | pdu_len = len; | |
2100 | } else { | |
2101 | sar = L2CAP_SAR_START; | |
2102 | sdu_len = len; | |
2103 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2104 | } | |
2105 | ||
2106 | while (len > 0) { | |
2107 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2108 | |
c74e560c | 2109 | if (IS_ERR(skb)) { |
94122bbe | 2110 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2111 | return PTR_ERR(skb); |
2112 | } | |
2113 | ||
94122bbe MM |
2114 | bt_cb(skb)->control.sar = sar; |
2115 | __skb_queue_tail(seg_queue, skb); | |
2116 | ||
2117 | len -= pdu_len; | |
2118 | if (sdu_len) { | |
2119 | sdu_len = 0; | |
2120 | pdu_len += L2CAP_SDULEN_SIZE; | |
2121 | } | |
2122 | ||
2123 | if (len <= pdu_len) { | |
2124 | sar = L2CAP_SAR_END; | |
2125 | pdu_len = len; | |
2126 | } else { | |
2127 | sar = L2CAP_SAR_CONTINUE; | |
2128 | } | |
c74e560c | 2129 | } |
c74e560c | 2130 | |
94122bbe | 2131 | return err; |
c74e560c GP |
2132 | } |
2133 | ||
5e59b791 LAD |
2134 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2135 | u32 priority) | |
9a91a04a | 2136 | { |
9a91a04a | 2137 | struct sk_buff *skb; |
9a91a04a | 2138 | int err; |
94122bbe | 2139 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2140 | |
2141 | /* Connectionless channel */ | |
715ec005 | 2142 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2143 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2144 | if (IS_ERR(skb)) |
2145 | return PTR_ERR(skb); | |
2146 | ||
2147 | l2cap_do_send(chan, skb); | |
2148 | return len; | |
2149 | } | |
2150 | ||
2151 | switch (chan->mode) { | |
2152 | case L2CAP_MODE_BASIC: | |
2153 | /* Check outgoing MTU */ | |
2154 | if (len > chan->omtu) | |
2155 | return -EMSGSIZE; | |
2156 | ||
2157 | /* Create a basic PDU */ | |
5e59b791 | 2158 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2159 | if (IS_ERR(skb)) |
2160 | return PTR_ERR(skb); | |
2161 | ||
2162 | l2cap_do_send(chan, skb); | |
2163 | err = len; | |
2164 | break; | |
2165 | ||
2166 | case L2CAP_MODE_ERTM: | |
2167 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2168 | /* Check outgoing MTU */ |
2169 | if (len > chan->omtu) { | |
2170 | err = -EMSGSIZE; | |
2171 | break; | |
2172 | } | |
9a91a04a | 2173 | |
94122bbe | 2174 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2175 | |
94122bbe MM |
2176 | /* Do segmentation before calling in to the state machine, |
2177 | * since it's possible to block while waiting for memory | |
2178 | * allocation. | |
2179 | */ | |
2180 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2181 | |
94122bbe MM |
2182 | /* The channel could have been closed while segmenting, |
2183 | * check that it is still connected. | |
2184 | */ | |
2185 | if (chan->state != BT_CONNECTED) { | |
2186 | __skb_queue_purge(&seg_queue); | |
2187 | err = -ENOTCONN; | |
9a91a04a GP |
2188 | } |
2189 | ||
94122bbe | 2190 | if (err) |
9a91a04a | 2191 | break; |
9a91a04a | 2192 | |
3733937d | 2193 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2194 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2195 | else |
d660366d | 2196 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2197 | |
d660366d | 2198 | err = len; |
9a91a04a | 2199 | |
94122bbe MM |
2200 | /* If the skbs were not queued for sending, they'll still be in |
2201 | * seg_queue and need to be purged. | |
2202 | */ | |
2203 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2204 | break; |
2205 | ||
2206 | default: | |
2207 | BT_DBG("bad state %1.1x", chan->mode); | |
2208 | err = -EBADFD; | |
2209 | } | |
2210 | ||
2211 | return err; | |
2212 | } | |
2213 | ||
d2a7ac5d MM |
2214 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2215 | { | |
bed68bde MM |
2216 | struct l2cap_ctrl control; |
2217 | u16 seq; | |
2218 | ||
2219 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2220 | ||
2221 | memset(&control, 0, sizeof(control)); | |
2222 | control.sframe = 1; | |
2223 | control.super = L2CAP_SUPER_SREJ; | |
2224 | ||
2225 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2226 | seq = __next_seq(chan, seq)) { | |
2227 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2228 | control.reqseq = seq; | |
2229 | l2cap_send_sframe(chan, &control); | |
2230 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2235 | } |
2236 | ||
2237 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2238 | { | |
bed68bde MM |
2239 | struct l2cap_ctrl control; |
2240 | ||
2241 | BT_DBG("chan %p", chan); | |
2242 | ||
2243 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2244 | return; | |
2245 | ||
2246 | memset(&control, 0, sizeof(control)); | |
2247 | control.sframe = 1; | |
2248 | control.super = L2CAP_SUPER_SREJ; | |
2249 | control.reqseq = chan->srej_list.tail; | |
2250 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2251 | } |
2252 | ||
2253 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2254 | { | |
bed68bde MM |
2255 | struct l2cap_ctrl control; |
2256 | u16 initial_head; | |
2257 | u16 seq; | |
2258 | ||
2259 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
2260 | ||
2261 | memset(&control, 0, sizeof(control)); | |
2262 | control.sframe = 1; | |
2263 | control.super = L2CAP_SUPER_SREJ; | |
2264 | ||
2265 | /* Capture initial list head to allow only one pass through the list. */ | |
2266 | initial_head = chan->srej_list.head; | |
2267 | ||
2268 | do { | |
2269 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2270 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2271 | break; | |
2272 | ||
2273 | control.reqseq = seq; | |
2274 | l2cap_send_sframe(chan, &control); | |
2275 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2276 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2277 | } |
2278 | ||
608bcc6d MM |
2279 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2280 | { | |
2281 | struct sk_buff *acked_skb; | |
2282 | u16 ackseq; | |
2283 | ||
2284 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2285 | ||
2286 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2287 | return; | |
2288 | ||
2289 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2290 | chan->expected_ack_seq, chan->unacked_frames); | |
2291 | ||
2292 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2293 | ackseq = __next_seq(chan, ackseq)) { | |
2294 | ||
2295 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2296 | if (acked_skb) { | |
2297 | skb_unlink(acked_skb, &chan->tx_q); | |
2298 | kfree_skb(acked_skb); | |
2299 | chan->unacked_frames--; | |
2300 | } | |
2301 | } | |
2302 | ||
2303 | chan->expected_ack_seq = reqseq; | |
2304 | ||
2305 | if (chan->unacked_frames == 0) | |
2306 | __clear_retrans_timer(chan); | |
2307 | ||
2308 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2309 | } | |
2310 | ||
2311 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2312 | { | |
2313 | BT_DBG("chan %p", chan); | |
2314 | ||
2315 | chan->expected_tx_seq = chan->buffer_seq; | |
2316 | l2cap_seq_list_clear(&chan->srej_list); | |
2317 | skb_queue_purge(&chan->srej_q); | |
2318 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2319 | } | |
2320 | ||
d660366d GP |
2321 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2322 | struct l2cap_ctrl *control, | |
2323 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2324 | { |
608bcc6d MM |
2325 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2326 | event); | |
2327 | ||
2328 | switch (event) { | |
2329 | case L2CAP_EV_DATA_REQUEST: | |
2330 | if (chan->tx_send_head == NULL) | |
2331 | chan->tx_send_head = skb_peek(skbs); | |
2332 | ||
2333 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2334 | l2cap_ertm_send(chan); | |
2335 | break; | |
2336 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2337 | BT_DBG("Enter LOCAL_BUSY"); | |
2338 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2339 | ||
2340 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2341 | /* The SREJ_SENT state must be aborted if we are to | |
2342 | * enter the LOCAL_BUSY state. | |
2343 | */ | |
2344 | l2cap_abort_rx_srej_sent(chan); | |
2345 | } | |
2346 | ||
2347 | l2cap_send_ack(chan); | |
2348 | ||
2349 | break; | |
2350 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2351 | BT_DBG("Exit LOCAL_BUSY"); | |
2352 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2353 | ||
2354 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2355 | struct l2cap_ctrl local_control; | |
2356 | ||
2357 | memset(&local_control, 0, sizeof(local_control)); | |
2358 | local_control.sframe = 1; | |
2359 | local_control.super = L2CAP_SUPER_RR; | |
2360 | local_control.poll = 1; | |
2361 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2362 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2363 | |
2364 | chan->retry_count = 1; | |
2365 | __set_monitor_timer(chan); | |
2366 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2367 | } | |
2368 | break; | |
2369 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2370 | l2cap_process_reqseq(chan, control->reqseq); | |
2371 | break; | |
2372 | case L2CAP_EV_EXPLICIT_POLL: | |
2373 | l2cap_send_rr_or_rnr(chan, 1); | |
2374 | chan->retry_count = 1; | |
2375 | __set_monitor_timer(chan); | |
2376 | __clear_ack_timer(chan); | |
2377 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2378 | break; | |
2379 | case L2CAP_EV_RETRANS_TO: | |
2380 | l2cap_send_rr_or_rnr(chan, 1); | |
2381 | chan->retry_count = 1; | |
2382 | __set_monitor_timer(chan); | |
2383 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2384 | break; | |
2385 | case L2CAP_EV_RECV_FBIT: | |
2386 | /* Nothing to process */ | |
2387 | break; | |
2388 | default: | |
2389 | break; | |
2390 | } | |
608bcc6d MM |
2391 | } |
2392 | ||
d660366d GP |
2393 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2394 | struct l2cap_ctrl *control, | |
2395 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2396 | { |
608bcc6d MM |
2397 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2398 | event); | |
2399 | ||
2400 | switch (event) { | |
2401 | case L2CAP_EV_DATA_REQUEST: | |
2402 | if (chan->tx_send_head == NULL) | |
2403 | chan->tx_send_head = skb_peek(skbs); | |
2404 | /* Queue data, but don't send. */ | |
2405 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2406 | break; | |
2407 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2408 | BT_DBG("Enter LOCAL_BUSY"); | |
2409 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2410 | ||
2411 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2412 | /* The SREJ_SENT state must be aborted if we are to | |
2413 | * enter the LOCAL_BUSY state. | |
2414 | */ | |
2415 | l2cap_abort_rx_srej_sent(chan); | |
2416 | } | |
2417 | ||
2418 | l2cap_send_ack(chan); | |
2419 | ||
2420 | break; | |
2421 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2422 | BT_DBG("Exit LOCAL_BUSY"); | |
2423 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2424 | ||
2425 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2426 | struct l2cap_ctrl local_control; | |
2427 | memset(&local_control, 0, sizeof(local_control)); | |
2428 | local_control.sframe = 1; | |
2429 | local_control.super = L2CAP_SUPER_RR; | |
2430 | local_control.poll = 1; | |
2431 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2432 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2433 | |
2434 | chan->retry_count = 1; | |
2435 | __set_monitor_timer(chan); | |
2436 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2437 | } | |
2438 | break; | |
2439 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2440 | l2cap_process_reqseq(chan, control->reqseq); | |
2441 | ||
2442 | /* Fall through */ | |
2443 | ||
2444 | case L2CAP_EV_RECV_FBIT: | |
2445 | if (control && control->final) { | |
2446 | __clear_monitor_timer(chan); | |
2447 | if (chan->unacked_frames > 0) | |
2448 | __set_retrans_timer(chan); | |
2449 | chan->retry_count = 0; | |
2450 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2451 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2452 | } | |
2453 | break; | |
2454 | case L2CAP_EV_EXPLICIT_POLL: | |
2455 | /* Ignore */ | |
2456 | break; | |
2457 | case L2CAP_EV_MONITOR_TO: | |
2458 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2459 | l2cap_send_rr_or_rnr(chan, 1); | |
2460 | __set_monitor_timer(chan); | |
2461 | chan->retry_count++; | |
2462 | } else { | |
2463 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2464 | } | |
2465 | break; | |
2466 | default: | |
2467 | break; | |
2468 | } | |
608bcc6d MM |
2469 | } |
2470 | ||
d660366d GP |
2471 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2472 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2473 | { |
608bcc6d MM |
2474 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2475 | chan, control, skbs, event, chan->tx_state); | |
2476 | ||
2477 | switch (chan->tx_state) { | |
2478 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2479 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2480 | break; |
2481 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2482 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2483 | break; |
2484 | default: | |
2485 | /* Ignore event */ | |
2486 | break; | |
2487 | } | |
608bcc6d MM |
2488 | } |
2489 | ||
4b51dae9 MM |
2490 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2491 | struct l2cap_ctrl *control) | |
2492 | { | |
2493 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2494 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2495 | } |
2496 | ||
f80842a8 MM |
2497 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2498 | struct l2cap_ctrl *control) | |
2499 | { | |
2500 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2501 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2502 | } |
2503 | ||
1da177e4 LT |
2504 | /* Copy frame to all raw sockets on that connection */ |
2505 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2506 | { | |
1da177e4 | 2507 | struct sk_buff *nskb; |
48454079 | 2508 | struct l2cap_chan *chan; |
1da177e4 LT |
2509 | |
2510 | BT_DBG("conn %p", conn); | |
2511 | ||
3df91ea2 | 2512 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2513 | |
3df91ea2 | 2514 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2515 | struct sock *sk = chan->sk; |
715ec005 | 2516 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2517 | continue; |
2518 | ||
2519 | /* Don't send frame to the socket it came from */ | |
2520 | if (skb->sk == sk) | |
2521 | continue; | |
af05b30b GP |
2522 | nskb = skb_clone(skb, GFP_ATOMIC); |
2523 | if (!nskb) | |
1da177e4 LT |
2524 | continue; |
2525 | ||
80b98027 | 2526 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2527 | kfree_skb(nskb); |
2528 | } | |
3d57dc68 | 2529 | |
3df91ea2 | 2530 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2531 | } |
2532 | ||
2533 | /* ---- L2CAP signalling commands ---- */ | |
2534 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2535 | u8 code, u8 ident, u16 dlen, void *data) | |
2536 | { | |
2537 | struct sk_buff *skb, **frag; | |
2538 | struct l2cap_cmd_hdr *cmd; | |
2539 | struct l2cap_hdr *lh; | |
2540 | int len, count; | |
2541 | ||
af05b30b GP |
2542 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2543 | conn, code, ident, dlen); | |
1da177e4 LT |
2544 | |
2545 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2546 | count = min_t(unsigned int, conn->mtu, len); | |
2547 | ||
2548 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2549 | if (!skb) | |
2550 | return NULL; | |
2551 | ||
2552 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2553 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2554 | |
2555 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2556 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2557 | else |
ac73498c | 2558 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2559 | |
2560 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2561 | cmd->code = code; | |
2562 | cmd->ident = ident; | |
aca3192c | 2563 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2564 | |
2565 | if (dlen) { | |
2566 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2567 | memcpy(skb_put(skb, count), data, count); | |
2568 | data += count; | |
2569 | } | |
2570 | ||
2571 | len -= skb->len; | |
2572 | ||
2573 | /* Continuation fragments (no L2CAP header) */ | |
2574 | frag = &skb_shinfo(skb)->frag_list; | |
2575 | while (len) { | |
2576 | count = min_t(unsigned int, conn->mtu, len); | |
2577 | ||
2578 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2579 | if (!*frag) | |
2580 | goto fail; | |
2581 | ||
2582 | memcpy(skb_put(*frag, count), data, count); | |
2583 | ||
2584 | len -= count; | |
2585 | data += count; | |
2586 | ||
2587 | frag = &(*frag)->next; | |
2588 | } | |
2589 | ||
2590 | return skb; | |
2591 | ||
2592 | fail: | |
2593 | kfree_skb(skb); | |
2594 | return NULL; | |
2595 | } | |
2596 | ||
2597 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2598 | { | |
2599 | struct l2cap_conf_opt *opt = *ptr; | |
2600 | int len; | |
2601 | ||
2602 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2603 | *ptr += len; | |
2604 | ||
2605 | *type = opt->type; | |
2606 | *olen = opt->len; | |
2607 | ||
2608 | switch (opt->len) { | |
2609 | case 1: | |
2610 | *val = *((u8 *) opt->val); | |
2611 | break; | |
2612 | ||
2613 | case 2: | |
bfaaeb3e | 2614 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2615 | break; |
2616 | ||
2617 | case 4: | |
bfaaeb3e | 2618 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2619 | break; |
2620 | ||
2621 | default: | |
2622 | *val = (unsigned long) opt->val; | |
2623 | break; | |
2624 | } | |
2625 | ||
2626 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2627 | return len; | |
2628 | } | |
2629 | ||
1da177e4 LT |
2630 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2631 | { | |
2632 | struct l2cap_conf_opt *opt = *ptr; | |
2633 | ||
2634 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2635 | ||
2636 | opt->type = type; | |
2637 | opt->len = len; | |
2638 | ||
2639 | switch (len) { | |
2640 | case 1: | |
2641 | *((u8 *) opt->val) = val; | |
2642 | break; | |
2643 | ||
2644 | case 2: | |
4f8b691c | 2645 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2646 | break; |
2647 | ||
2648 | case 4: | |
4f8b691c | 2649 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2650 | break; |
2651 | ||
2652 | default: | |
2653 | memcpy(opt->val, (void *) val, len); | |
2654 | break; | |
2655 | } | |
2656 | ||
2657 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2658 | } | |
2659 | ||
f89cef09 AE |
2660 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2661 | { | |
2662 | struct l2cap_conf_efs efs; | |
2663 | ||
1ec918ce | 2664 | switch (chan->mode) { |
f89cef09 AE |
2665 | case L2CAP_MODE_ERTM: |
2666 | efs.id = chan->local_id; | |
2667 | efs.stype = chan->local_stype; | |
2668 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2669 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c AE |
2670 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2671 | efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2672 | break; |
2673 | ||
2674 | case L2CAP_MODE_STREAMING: | |
2675 | efs.id = 1; | |
2676 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2677 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2678 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2679 | efs.acc_lat = 0; | |
2680 | efs.flush_to = 0; | |
2681 | break; | |
2682 | ||
2683 | default: | |
2684 | return; | |
2685 | } | |
2686 | ||
2687 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2688 | (unsigned long) &efs); | |
2689 | } | |
2690 | ||
721c4181 | 2691 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2692 | { |
721c4181 | 2693 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2694 | ack_timer.work); |
2695 | u16 frames_to_ack; | |
c1b4f43b | 2696 | |
2fb9b3d4 GP |
2697 | BT_DBG("chan %p", chan); |
2698 | ||
6be36555 AE |
2699 | l2cap_chan_lock(chan); |
2700 | ||
0362520b MM |
2701 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2702 | chan->last_acked_seq); | |
6be36555 | 2703 | |
0362520b MM |
2704 | if (frames_to_ack) |
2705 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2706 | |
0362520b | 2707 | l2cap_chan_unlock(chan); |
09bfb2ee | 2708 | l2cap_chan_put(chan); |
c1b4f43b GP |
2709 | } |
2710 | ||
466f8004 | 2711 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2712 | { |
3c588192 MM |
2713 | int err; |
2714 | ||
105bdf9e MM |
2715 | chan->next_tx_seq = 0; |
2716 | chan->expected_tx_seq = 0; | |
42e5c802 | 2717 | chan->expected_ack_seq = 0; |
6a026610 | 2718 | chan->unacked_frames = 0; |
42e5c802 | 2719 | chan->buffer_seq = 0; |
6a026610 | 2720 | chan->frames_sent = 0; |
105bdf9e MM |
2721 | chan->last_acked_seq = 0; |
2722 | chan->sdu = NULL; | |
2723 | chan->sdu_last_frag = NULL; | |
2724 | chan->sdu_len = 0; | |
2725 | ||
d34c34fb MM |
2726 | skb_queue_head_init(&chan->tx_q); |
2727 | ||
105bdf9e MM |
2728 | if (chan->mode != L2CAP_MODE_ERTM) |
2729 | return 0; | |
2730 | ||
2731 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2732 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2733 | |
721c4181 GP |
2734 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2735 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2736 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2737 | |
f1c6775b | 2738 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2739 | |
3c588192 MM |
2740 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2741 | if (err < 0) | |
2742 | return err; | |
2743 | ||
9dc9affc MM |
2744 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2745 | if (err < 0) | |
2746 | l2cap_seq_list_free(&chan->srej_list); | |
2747 | ||
2748 | return err; | |
0565c1c2 GP |
2749 | } |
2750 | ||
f2fcfcd6 GP |
2751 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2752 | { | |
2753 | switch (mode) { | |
2754 | case L2CAP_MODE_STREAMING: | |
2755 | case L2CAP_MODE_ERTM: | |
2756 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2757 | return mode; | |
2758 | /* fall through */ | |
2759 | default: | |
2760 | return L2CAP_MODE_BASIC; | |
2761 | } | |
2762 | } | |
2763 | ||
6327eb98 AE |
2764 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2765 | { | |
2766 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2767 | } | |
2768 | ||
f89cef09 AE |
2769 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2770 | { | |
2771 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2772 | } | |
2773 | ||
6327eb98 AE |
2774 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2775 | { | |
2776 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2777 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2778 | /* use extended control field */ |
2779 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2780 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2781 | } else { | |
6327eb98 AE |
2782 | chan->tx_win = min_t(u16, chan->tx_win, |
2783 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2784 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2785 | } | |
6327eb98 AE |
2786 | } |
2787 | ||
710f9b0a | 2788 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2789 | { |
1da177e4 | 2790 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2791 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2792 | void *ptr = req->data; |
c8f79162 | 2793 | u16 size; |
1da177e4 | 2794 | |
49208c9c | 2795 | BT_DBG("chan %p", chan); |
1da177e4 | 2796 | |
73ffa904 | 2797 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2798 | goto done; |
2799 | ||
0c1bc5c6 | 2800 | switch (chan->mode) { |
f2fcfcd6 GP |
2801 | case L2CAP_MODE_STREAMING: |
2802 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2803 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2804 | break; |
85eb53c6 | 2805 | |
f89cef09 AE |
2806 | if (__l2cap_efs_supported(chan)) |
2807 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2808 | ||
2ba13ed6 | 2809 | /* fall through */ |
f2fcfcd6 | 2810 | default: |
8c1d787b | 2811 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2812 | break; |
2813 | } | |
2814 | ||
2815 | done: | |
0c1bc5c6 GP |
2816 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2817 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2818 | |
0c1bc5c6 | 2819 | switch (chan->mode) { |
65c7c491 | 2820 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2821 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2822 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2823 | break; |
2824 | ||
62547752 GP |
2825 | rfc.mode = L2CAP_MODE_BASIC; |
2826 | rfc.txwin_size = 0; | |
2827 | rfc.max_transmit = 0; | |
2828 | rfc.retrans_timeout = 0; | |
2829 | rfc.monitor_timeout = 0; | |
2830 | rfc.max_pdu_size = 0; | |
2831 | ||
63406504 GP |
2832 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2833 | (unsigned long) &rfc); | |
65c7c491 MH |
2834 | break; |
2835 | ||
2836 | case L2CAP_MODE_ERTM: | |
2837 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2838 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2839 | rfc.retrans_timeout = 0; |
2840 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2841 | |
2842 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2843 | L2CAP_EXT_HDR_SIZE - | |
2844 | L2CAP_SDULEN_SIZE - | |
2845 | L2CAP_FCS_SIZE); | |
2846 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2847 | |
6327eb98 AE |
2848 | l2cap_txwin_setup(chan); |
2849 | ||
2850 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2851 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2852 | |
63406504 GP |
2853 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2854 | (unsigned long) &rfc); | |
2855 | ||
f89cef09 AE |
2856 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2857 | l2cap_add_opt_efs(&ptr, chan); | |
2858 | ||
8c1d787b | 2859 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2860 | break; |
2861 | ||
47d1ec61 | 2862 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2863 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2864 | chan->fcs = L2CAP_FCS_NONE; |
2865 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2866 | } |
6327eb98 AE |
2867 | |
2868 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2869 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2870 | chan->tx_win); | |
f2fcfcd6 GP |
2871 | break; |
2872 | ||
2873 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2874 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2875 | rfc.mode = L2CAP_MODE_STREAMING; |
2876 | rfc.txwin_size = 0; | |
2877 | rfc.max_transmit = 0; | |
2878 | rfc.retrans_timeout = 0; | |
2879 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2880 | |
2881 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2882 | L2CAP_EXT_HDR_SIZE - | |
2883 | L2CAP_SDULEN_SIZE - | |
2884 | L2CAP_FCS_SIZE); | |
2885 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2886 | |
63406504 GP |
2887 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2888 | (unsigned long) &rfc); | |
2889 | ||
f89cef09 AE |
2890 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2891 | l2cap_add_opt_efs(&ptr, chan); | |
2892 | ||
8c1d787b | 2893 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2894 | break; |
2895 | ||
47d1ec61 | 2896 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2897 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2898 | chan->fcs = L2CAP_FCS_NONE; |
2899 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2900 | } |
65c7c491 MH |
2901 | break; |
2902 | } | |
1da177e4 | 2903 | |
fe4128e0 | 2904 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2905 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2906 | |
2907 | return ptr - data; | |
2908 | } | |
2909 | ||
73ffa904 | 2910 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2911 | { |
5dee9e7c MH |
2912 | struct l2cap_conf_rsp *rsp = data; |
2913 | void *ptr = rsp->data; | |
73ffa904 GP |
2914 | void *req = chan->conf_req; |
2915 | int len = chan->conf_len; | |
5dee9e7c MH |
2916 | int type, hint, olen; |
2917 | unsigned long val; | |
6464f35f | 2918 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2919 | struct l2cap_conf_efs efs; |
2920 | u8 remote_efs = 0; | |
861d6882 | 2921 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2922 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2923 | u16 size; |
1da177e4 | 2924 | |
73ffa904 | 2925 | BT_DBG("chan %p", chan); |
820ae1b8 | 2926 | |
5dee9e7c MH |
2927 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2928 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2929 | |
589d2746 | 2930 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2931 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2932 | |
2933 | switch (type) { | |
2934 | case L2CAP_CONF_MTU: | |
861d6882 | 2935 | mtu = val; |
5dee9e7c MH |
2936 | break; |
2937 | ||
2938 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2939 | chan->flush_to = val; |
5dee9e7c MH |
2940 | break; |
2941 | ||
2942 | case L2CAP_CONF_QOS: | |
2943 | break; | |
2944 | ||
6464f35f MH |
2945 | case L2CAP_CONF_RFC: |
2946 | if (olen == sizeof(rfc)) | |
2947 | memcpy(&rfc, (void *) val, olen); | |
2948 | break; | |
2949 | ||
fcc203c3 GP |
2950 | case L2CAP_CONF_FCS: |
2951 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2952 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2953 | break; |
fcc203c3 | 2954 | |
42dceae2 AE |
2955 | case L2CAP_CONF_EFS: |
2956 | remote_efs = 1; | |
2957 | if (olen == sizeof(efs)) | |
2958 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2959 | break; |
2960 | ||
6327eb98 AE |
2961 | case L2CAP_CONF_EWS: |
2962 | if (!enable_hs) | |
2963 | return -ECONNREFUSED; | |
fcc203c3 | 2964 | |
6327eb98 AE |
2965 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2966 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2967 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2968 | chan->remote_tx_win = val; |
fcc203c3 GP |
2969 | break; |
2970 | ||
5dee9e7c MH |
2971 | default: |
2972 | if (hint) | |
2973 | break; | |
2974 | ||
2975 | result = L2CAP_CONF_UNKNOWN; | |
2976 | *((u8 *) ptr++) = type; | |
2977 | break; | |
2978 | } | |
2979 | } | |
2980 | ||
73ffa904 | 2981 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2982 | goto done; |
2983 | ||
0c1bc5c6 | 2984 | switch (chan->mode) { |
f2fcfcd6 GP |
2985 | case L2CAP_MODE_STREAMING: |
2986 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2987 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2988 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2989 | chan->conn->feat_mask); |
85eb53c6 GP |
2990 | break; |
2991 | } | |
2992 | ||
42dceae2 AE |
2993 | if (remote_efs) { |
2994 | if (__l2cap_efs_supported(chan)) | |
2995 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2996 | else | |
2997 | return -ECONNREFUSED; | |
2998 | } | |
2999 | ||
0c1bc5c6 | 3000 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3001 | return -ECONNREFUSED; |
742e519b | 3002 | |
f2fcfcd6 | 3003 | break; |
f2fcfcd6 GP |
3004 | } |
3005 | ||
3006 | done: | |
0c1bc5c6 | 3007 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3008 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3009 | rfc.mode = chan->mode; |
f2fcfcd6 | 3010 | |
73ffa904 | 3011 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3012 | return -ECONNREFUSED; |
3013 | ||
3014 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3015 | sizeof(rfc), (unsigned long) &rfc); | |
3016 | } | |
3017 | ||
5dee9e7c MH |
3018 | if (result == L2CAP_CONF_SUCCESS) { |
3019 | /* Configure output options and let the other side know | |
3020 | * which ones we don't like. */ | |
3021 | ||
f2fcfcd6 GP |
3022 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3023 | result = L2CAP_CONF_UNACCEPT; | |
3024 | else { | |
0c1bc5c6 | 3025 | chan->omtu = mtu; |
c1360a1c | 3026 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3027 | } |
0c1bc5c6 | 3028 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3029 | |
42dceae2 AE |
3030 | if (remote_efs) { |
3031 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3032 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3033 | efs.stype != chan->local_stype) { | |
3034 | ||
3035 | result = L2CAP_CONF_UNACCEPT; | |
3036 | ||
3037 | if (chan->num_conf_req >= 1) | |
3038 | return -ECONNREFUSED; | |
3039 | ||
3040 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3041 | sizeof(efs), |
42dceae2 | 3042 | (unsigned long) &efs); |
0e8b207e | 3043 | } else { |
3e6b3b95 | 3044 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3045 | result = L2CAP_CONF_PENDING; |
3046 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3047 | } |
3048 | } | |
3049 | ||
f2fcfcd6 GP |
3050 | switch (rfc.mode) { |
3051 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3052 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3053 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3054 | break; |
3055 | ||
3056 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3057 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3058 | chan->remote_tx_win = rfc.txwin_size; | |
3059 | else | |
3060 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3061 | |
2c03a7a4 | 3062 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3063 | |
c8f79162 AE |
3064 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3065 | chan->conn->mtu - | |
3066 | L2CAP_EXT_HDR_SIZE - | |
3067 | L2CAP_SDULEN_SIZE - | |
3068 | L2CAP_FCS_SIZE); | |
3069 | rfc.max_pdu_size = cpu_to_le16(size); | |
3070 | chan->remote_mps = size; | |
f2fcfcd6 | 3071 | |
10467e9e | 3072 | rfc.retrans_timeout = |
4fd21a88 | 3073 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3074 | rfc.monitor_timeout = |
4fd21a88 | 3075 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3076 | |
c1360a1c | 3077 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3078 | |
3079 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3080 | sizeof(rfc), (unsigned long) &rfc); | |
3081 | ||
42dceae2 AE |
3082 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3083 | chan->remote_id = efs.id; | |
3084 | chan->remote_stype = efs.stype; | |
3085 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3086 | chan->remote_flush_to = | |
3087 | le32_to_cpu(efs.flush_to); | |
3088 | chan->remote_acc_lat = | |
3089 | le32_to_cpu(efs.acc_lat); | |
3090 | chan->remote_sdu_itime = | |
3091 | le32_to_cpu(efs.sdu_itime); | |
3092 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3093 | sizeof(efs), (unsigned long) &efs); | |
3094 | } | |
f2fcfcd6 GP |
3095 | break; |
3096 | ||
3097 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3098 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3099 | chan->conn->mtu - | |
3100 | L2CAP_EXT_HDR_SIZE - | |
3101 | L2CAP_SDULEN_SIZE - | |
3102 | L2CAP_FCS_SIZE); | |
3103 | rfc.max_pdu_size = cpu_to_le16(size); | |
3104 | chan->remote_mps = size; | |
f2fcfcd6 | 3105 | |
c1360a1c | 3106 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3107 | |
3108 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3109 | sizeof(rfc), (unsigned long) &rfc); | |
3110 | ||
f2fcfcd6 GP |
3111 | break; |
3112 | ||
3113 | default: | |
5dee9e7c | 3114 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3115 | |
6464f35f | 3116 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3117 | rfc.mode = chan->mode; |
f2fcfcd6 | 3118 | } |
6464f35f | 3119 | |
f2fcfcd6 | 3120 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3121 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3122 | } |
fe4128e0 | 3123 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3124 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3125 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3126 | |
3127 | return ptr - data; | |
1da177e4 LT |
3128 | } |
3129 | ||
b4450035 | 3130 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3131 | { |
f2fcfcd6 GP |
3132 | struct l2cap_conf_req *req = data; |
3133 | void *ptr = req->data; | |
3134 | int type, olen; | |
3135 | unsigned long val; | |
36e999a8 | 3136 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3137 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3138 | |
fe4128e0 | 3139 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3140 | |
3141 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3142 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3143 | ||
3144 | switch (type) { | |
3145 | case L2CAP_CONF_MTU: | |
3146 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3147 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3148 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3149 | } else |
0c1bc5c6 GP |
3150 | chan->imtu = val; |
3151 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3152 | break; |
3153 | ||
3154 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3155 | chan->flush_to = val; |
f2fcfcd6 | 3156 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3157 | 2, chan->flush_to); |
f2fcfcd6 GP |
3158 | break; |
3159 | ||
3160 | case L2CAP_CONF_RFC: | |
3161 | if (olen == sizeof(rfc)) | |
3162 | memcpy(&rfc, (void *)val, olen); | |
3163 | ||
c1360a1c | 3164 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3165 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3166 | return -ECONNREFUSED; |
3167 | ||
47d1ec61 | 3168 | chan->fcs = 0; |
f2fcfcd6 GP |
3169 | |
3170 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3171 | sizeof(rfc), (unsigned long) &rfc); | |
3172 | break; | |
6327eb98 AE |
3173 | |
3174 | case L2CAP_CONF_EWS: | |
3175 | chan->tx_win = min_t(u16, val, | |
3176 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3177 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3178 | chan->tx_win); | |
6327eb98 | 3179 | break; |
66af7aaf AE |
3180 | |
3181 | case L2CAP_CONF_EFS: | |
3182 | if (olen == sizeof(efs)) | |
3183 | memcpy(&efs, (void *)val, olen); | |
3184 | ||
3185 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3186 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3187 | efs.stype != chan->local_stype) | |
3188 | return -ECONNREFUSED; | |
3189 | ||
3190 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3191 | sizeof(efs), (unsigned long) &efs); | |
3192 | break; | |
f2fcfcd6 GP |
3193 | } |
3194 | } | |
3195 | ||
0c1bc5c6 | 3196 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3197 | return -ECONNREFUSED; |
3198 | ||
0c1bc5c6 | 3199 | chan->mode = rfc.mode; |
6c2ea7a8 | 3200 | |
0e8b207e | 3201 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3202 | switch (rfc.mode) { |
3203 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3204 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3205 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3206 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3207 | |
3208 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3209 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3210 | chan->local_sdu_itime = | |
3211 | le32_to_cpu(efs.sdu_itime); | |
3212 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3213 | chan->local_flush_to = | |
3214 | le32_to_cpu(efs.flush_to); | |
3215 | } | |
f2fcfcd6 | 3216 | break; |
66af7aaf | 3217 | |
f2fcfcd6 | 3218 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3219 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3220 | } |
3221 | } | |
3222 | ||
fe4128e0 | 3223 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3224 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3225 | |
3226 | return ptr - data; | |
3227 | } | |
3228 | ||
fe4128e0 | 3229 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3230 | { |
3231 | struct l2cap_conf_rsp *rsp = data; | |
3232 | void *ptr = rsp->data; | |
1da177e4 | 3233 | |
fe4128e0 | 3234 | BT_DBG("chan %p", chan); |
1da177e4 | 3235 | |
fe4128e0 | 3236 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3237 | rsp->result = cpu_to_le16(result); |
aca3192c | 3238 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3239 | |
3240 | return ptr - data; | |
3241 | } | |
3242 | ||
8c1d787b | 3243 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3244 | { |
3245 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3246 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3247 | u8 buf[128]; |
3248 | ||
fe4128e0 GP |
3249 | rsp.scid = cpu_to_le16(chan->dcid); |
3250 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3251 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3252 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3253 | l2cap_send_cmd(conn, chan->ident, |
3254 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3255 | ||
c1360a1c | 3256 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3257 | return; |
3258 | ||
710f9b0a GP |
3259 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3260 | l2cap_build_conf_req(chan, buf), buf); | |
3261 | chan->num_conf_req++; | |
3262 | } | |
3263 | ||
47d1ec61 | 3264 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3265 | { |
7b1c0049 GP |
3266 | int type, olen; |
3267 | unsigned long val; | |
3268 | struct l2cap_conf_rfc rfc; | |
3269 | ||
47d1ec61 | 3270 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3271 | |
0c1bc5c6 | 3272 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3273 | return; |
3274 | ||
3275 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3276 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3277 | ||
3278 | switch (type) { | |
3279 | case L2CAP_CONF_RFC: | |
3280 | if (olen == sizeof(rfc)) | |
3281 | memcpy(&rfc, (void *)val, olen); | |
3282 | goto done; | |
3283 | } | |
3284 | } | |
3285 | ||
36e999a8 MM |
3286 | /* Use sane default values in case a misbehaving remote device |
3287 | * did not send an RFC option. | |
3288 | */ | |
3289 | rfc.mode = chan->mode; | |
ac73498c AE |
3290 | rfc.retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3291 | rfc.monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36e999a8 MM |
3292 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); |
3293 | ||
3294 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3295 | ||
7b1c0049 GP |
3296 | done: |
3297 | switch (rfc.mode) { | |
3298 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3299 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3300 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3301 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3302 | break; |
3303 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3304 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3305 | } |
3306 | } | |
3307 | ||
4e8402a3 MH |
3308 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3309 | { | |
e2fd318e | 3310 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3311 | |
e2fd318e | 3312 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3313 | return 0; |
3314 | ||
3315 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3316 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3317 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3318 | |
3319 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3320 | conn->info_ident = 0; |
984947dc | 3321 | |
4e8402a3 MH |
3322 | l2cap_conn_start(conn); |
3323 | } | |
3324 | ||
3325 | return 0; | |
3326 | } | |
3327 | ||
1da177e4 LT |
3328 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3329 | { | |
1da177e4 LT |
3330 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3331 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3332 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3333 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3334 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3335 | |
3336 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3337 | __le16 psm = req->psm; |
1da177e4 | 3338 | |
097db76c | 3339 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3340 | |
3341 | /* Check if we have socket listening on psm */ | |
c2287681 | 3342 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3343 | if (!pchan) { |
1da177e4 LT |
3344 | result = L2CAP_CR_BAD_PSM; |
3345 | goto sendresp; | |
3346 | } | |
3347 | ||
23691d75 GP |
3348 | parent = pchan->sk; |
3349 | ||
3df91ea2 | 3350 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3351 | lock_sock(parent); |
e0f0cb56 | 3352 | |
e7c29cb1 | 3353 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3354 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3355 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3356 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3357 | result = L2CAP_CR_SEC_BLOCK; |
3358 | goto response; | |
3359 | } | |
3360 | ||
1da177e4 LT |
3361 | result = L2CAP_CR_NO_MEM; |
3362 | ||
2dfa1003 GP |
3363 | /* Check if we already have channel with that dcid */ |
3364 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3365 | goto response; | |
3366 | ||
80b98027 | 3367 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3368 | if (!chan) |
1da177e4 LT |
3369 | goto response; |
3370 | ||
80808e43 GP |
3371 | sk = chan->sk; |
3372 | ||
1da177e4 LT |
3373 | hci_conn_hold(conn->hcon); |
3374 | ||
1da177e4 LT |
3375 | bacpy(&bt_sk(sk)->src, conn->src); |
3376 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3377 | chan->psm = psm; |
3378 | chan->dcid = scid; | |
1da177e4 | 3379 | |
d1010240 GP |
3380 | bt_accept_enqueue(parent, sk); |
3381 | ||
6be36555 | 3382 | __l2cap_chan_add(conn, chan); |
48454079 | 3383 | |
fe4128e0 | 3384 | dcid = chan->scid; |
1da177e4 | 3385 | |
c9b66675 | 3386 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3387 | |
fc7f8a7e | 3388 | chan->ident = cmd->ident; |
1da177e4 | 3389 | |
984947dc | 3390 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3391 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3392 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3393 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3394 | result = L2CAP_CR_PEND; |
3395 | status = L2CAP_CS_AUTHOR_PEND; | |
3396 | parent->sk_data_ready(parent, 0); | |
3397 | } else { | |
0e587be7 | 3398 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3399 | result = L2CAP_CR_SUCCESS; |
3400 | status = L2CAP_CS_NO_INFO; | |
3401 | } | |
79d554a6 | 3402 | } else { |
0e587be7 | 3403 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3404 | result = L2CAP_CR_PEND; |
3405 | status = L2CAP_CS_AUTHEN_PEND; | |
3406 | } | |
3407 | } else { | |
0e587be7 | 3408 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3409 | result = L2CAP_CR_PEND; |
3410 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3411 | } |
3412 | ||
1da177e4 | 3413 | response: |
aa2ac881 | 3414 | release_sock(parent); |
3df91ea2 | 3415 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3416 | |
3417 | sendresp: | |
aca3192c YH |
3418 | rsp.scid = cpu_to_le16(scid); |
3419 | rsp.dcid = cpu_to_le16(dcid); | |
3420 | rsp.result = cpu_to_le16(result); | |
3421 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3422 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3423 | |
3424 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3425 | struct l2cap_info_req info; | |
ac73498c | 3426 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3427 | |
3428 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3429 | conn->info_ident = l2cap_get_ident(conn); | |
3430 | ||
ba13ccd9 | 3431 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3432 | |
3433 | l2cap_send_cmd(conn, conn->info_ident, | |
3434 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3435 | } | |
3436 | ||
c1360a1c | 3437 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3438 | result == L2CAP_CR_SUCCESS) { |
3439 | u8 buf[128]; | |
c1360a1c | 3440 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3441 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3442 | l2cap_build_conf_req(chan, buf), buf); |
3443 | chan->num_conf_req++; | |
e9aeb2dd GP |
3444 | } |
3445 | ||
1da177e4 LT |
3446 | return 0; |
3447 | } | |
3448 | ||
3449 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3450 | { | |
3451 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3452 | u16 scid, dcid, result, status; | |
48454079 | 3453 | struct l2cap_chan *chan; |
1da177e4 | 3454 | u8 req[128]; |
3df91ea2 | 3455 | int err; |
1da177e4 LT |
3456 | |
3457 | scid = __le16_to_cpu(rsp->scid); | |
3458 | dcid = __le16_to_cpu(rsp->dcid); | |
3459 | result = __le16_to_cpu(rsp->result); | |
3460 | status = __le16_to_cpu(rsp->status); | |
3461 | ||
1b009c98 AE |
3462 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3463 | dcid, scid, result, status); | |
1da177e4 | 3464 | |
3df91ea2 AE |
3465 | mutex_lock(&conn->chan_lock); |
3466 | ||
1da177e4 | 3467 | if (scid) { |
3df91ea2 AE |
3468 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3469 | if (!chan) { | |
3470 | err = -EFAULT; | |
3471 | goto unlock; | |
3472 | } | |
1da177e4 | 3473 | } else { |
3df91ea2 AE |
3474 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3475 | if (!chan) { | |
3476 | err = -EFAULT; | |
3477 | goto unlock; | |
3478 | } | |
1da177e4 LT |
3479 | } |
3480 | ||
3df91ea2 AE |
3481 | err = 0; |
3482 | ||
6be36555 | 3483 | l2cap_chan_lock(chan); |
48454079 | 3484 | |
1da177e4 LT |
3485 | switch (result) { |
3486 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3487 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3488 | chan->ident = 0; |
fe4128e0 | 3489 | chan->dcid = dcid; |
c1360a1c | 3490 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3491 | |
c1360a1c | 3492 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3493 | break; |
3494 | ||
1da177e4 | 3495 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3496 | l2cap_build_conf_req(chan, req), req); |
3497 | chan->num_conf_req++; | |
1da177e4 LT |
3498 | break; |
3499 | ||
3500 | case L2CAP_CR_PEND: | |
c1360a1c | 3501 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3502 | break; |
3503 | ||
3504 | default: | |
48454079 | 3505 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3506 | break; |
3507 | } | |
3508 | ||
6be36555 | 3509 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3510 | |
3511 | unlock: | |
3512 | mutex_unlock(&conn->chan_lock); | |
3513 | ||
3514 | return err; | |
1da177e4 LT |
3515 | } |
3516 | ||
47d1ec61 | 3517 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3518 | { |
3519 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3520 | * sides request it. | |
3521 | */ | |
0c1bc5c6 | 3522 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3523 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3524 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3525 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3526 | } |
3527 | ||
88219a0f | 3528 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3529 | { |
3530 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3531 | u16 dcid, flags; | |
3532 | u8 rsp[64]; | |
48454079 | 3533 | struct l2cap_chan *chan; |
3c588192 | 3534 | int len, err = 0; |
1da177e4 LT |
3535 | |
3536 | dcid = __le16_to_cpu(req->dcid); | |
3537 | flags = __le16_to_cpu(req->flags); | |
3538 | ||
3539 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3540 | ||
baa7e1fa | 3541 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3542 | if (!chan) |
1da177e4 LT |
3543 | return -ENOENT; |
3544 | ||
033b1142 | 3545 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3546 | struct l2cap_cmd_rej_cid rej; |
3547 | ||
ac73498c | 3548 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3549 | rej.scid = cpu_to_le16(chan->scid); |
3550 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3551 | |
df6bd743 GP |
3552 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3553 | sizeof(rej), &rej); | |
354f60a9 | 3554 | goto unlock; |
df6bd743 | 3555 | } |
354f60a9 | 3556 | |
5dee9e7c | 3557 | /* Reject if config buffer is too small. */ |
88219a0f | 3558 | len = cmd_len - sizeof(*req); |
7ac28817 | 3559 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3560 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3561 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3562 | L2CAP_CONF_REJECT, flags), rsp); |
3563 | goto unlock; | |
3564 | } | |
3565 | ||
3566 | /* Store config. */ | |
73ffa904 GP |
3567 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3568 | chan->conf_len += len; | |
1da177e4 | 3569 | |
59e54bd1 | 3570 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3571 | /* Incomplete config. Send empty response. */ |
3572 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3573 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3574 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3575 | goto unlock; |
3576 | } | |
3577 | ||
3578 | /* Complete config. */ | |
73ffa904 | 3579 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3580 | if (len < 0) { |
e92c8e70 | 3581 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3582 | goto unlock; |
f2fcfcd6 | 3583 | } |
1da177e4 | 3584 | |
5dee9e7c | 3585 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3586 | chan->num_conf_rsp++; |
5dee9e7c | 3587 | |
5dee9e7c | 3588 | /* Reset config buffer. */ |
73ffa904 | 3589 | chan->conf_len = 0; |
5dee9e7c | 3590 | |
c1360a1c | 3591 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3592 | goto unlock; |
3593 | ||
c1360a1c | 3594 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3595 | set_default_fcs(chan); |
fcc203c3 | 3596 | |
105bdf9e MM |
3597 | if (chan->mode == L2CAP_MODE_ERTM || |
3598 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3599 | err = l2cap_ertm_init(chan); |
3600 | ||
3601 | if (err < 0) | |
3602 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3603 | else | |
3604 | l2cap_chan_ready(chan); | |
0565c1c2 | 3605 | |
876d9484 MH |
3606 | goto unlock; |
3607 | } | |
3608 | ||
c1360a1c | 3609 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3610 | u8 buf[64]; |
1da177e4 | 3611 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3612 | l2cap_build_conf_req(chan, buf), buf); |
3613 | chan->num_conf_req++; | |
1da177e4 LT |
3614 | } |
3615 | ||
0e8b207e AE |
3616 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3617 | Conf Rsp PENDING in the code above */ | |
3618 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3619 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3620 | ||
3621 | /* check compatibility */ | |
3622 | ||
3623 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3624 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3625 | ||
3626 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3627 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3628 | L2CAP_CONF_SUCCESS, flags), rsp); |
0e8b207e AE |
3629 | } |
3630 | ||
1da177e4 | 3631 | unlock: |
6be36555 | 3632 | l2cap_chan_unlock(chan); |
3c588192 | 3633 | return err; |
1da177e4 LT |
3634 | } |
3635 | ||
3636 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3637 | { | |
3638 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3639 | u16 scid, flags, result; | |
48454079 | 3640 | struct l2cap_chan *chan; |
61386cba | 3641 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3642 | int err = 0; |
1da177e4 LT |
3643 | |
3644 | scid = __le16_to_cpu(rsp->scid); | |
3645 | flags = __le16_to_cpu(rsp->flags); | |
3646 | result = __le16_to_cpu(rsp->result); | |
3647 | ||
61386cba AE |
3648 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3649 | result, len); | |
1da177e4 | 3650 | |
baa7e1fa | 3651 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3652 | if (!chan) |
1da177e4 LT |
3653 | return 0; |
3654 | ||
3655 | switch (result) { | |
3656 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3657 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3658 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3659 | break; |
3660 | ||
0e8b207e AE |
3661 | case L2CAP_CONF_PENDING: |
3662 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3663 | ||
3664 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3665 | char buf[64]; | |
3666 | ||
3667 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3668 | buf, &result); | |
3669 | if (len < 0) { | |
3670 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3671 | goto done; | |
3672 | } | |
3673 | ||
3674 | /* check compatibility */ | |
3675 | ||
3676 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3677 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3678 | ||
3679 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3680 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3681 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3682 | } | |
3683 | goto done; | |
3684 | ||
1da177e4 | 3685 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3686 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3687 | char req[64]; |
3688 | ||
c2c77ec8 | 3689 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3690 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3691 | goto done; |
3692 | } | |
3693 | ||
f2fcfcd6 GP |
3694 | /* throw out any old stored conf requests */ |
3695 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3696 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3697 | req, &result); | |
f2fcfcd6 | 3698 | if (len < 0) { |
e92c8e70 | 3699 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3700 | goto done; |
3701 | } | |
3702 | ||
3703 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3704 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3705 | chan->num_conf_req++; |
f2fcfcd6 GP |
3706 | if (result != L2CAP_CONF_SUCCESS) |
3707 | goto done; | |
3708 | break; | |
1da177e4 LT |
3709 | } |
3710 | ||
8e87d142 | 3711 | default: |
6be36555 | 3712 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3713 | |
ba13ccd9 | 3714 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3715 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3716 | goto done; |
3717 | } | |
3718 | ||
59e54bd1 | 3719 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3720 | goto done; |
3721 | ||
c1360a1c | 3722 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3723 | |
c1360a1c | 3724 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3725 | set_default_fcs(chan); |
fcc203c3 | 3726 | |
105bdf9e MM |
3727 | if (chan->mode == L2CAP_MODE_ERTM || |
3728 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3729 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3730 | |
3c588192 MM |
3731 | if (err < 0) |
3732 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3733 | else | |
3734 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3735 | } |
3736 | ||
3737 | done: | |
6be36555 | 3738 | l2cap_chan_unlock(chan); |
3c588192 | 3739 | return err; |
1da177e4 LT |
3740 | } |
3741 | ||
3742 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3743 | { | |
3744 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3745 | struct l2cap_disconn_rsp rsp; | |
3746 | u16 dcid, scid; | |
48454079 | 3747 | struct l2cap_chan *chan; |
1da177e4 LT |
3748 | struct sock *sk; |
3749 | ||
3750 | scid = __le16_to_cpu(req->scid); | |
3751 | dcid = __le16_to_cpu(req->dcid); | |
3752 | ||
3753 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3754 | ||
3df91ea2 AE |
3755 | mutex_lock(&conn->chan_lock); |
3756 | ||
3757 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3758 | if (!chan) { | |
3759 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3760 | return 0; |
3df91ea2 | 3761 | } |
1da177e4 | 3762 | |
6be36555 AE |
3763 | l2cap_chan_lock(chan); |
3764 | ||
48454079 GP |
3765 | sk = chan->sk; |
3766 | ||
fe4128e0 GP |
3767 | rsp.dcid = cpu_to_le16(chan->scid); |
3768 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3769 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3770 | ||
6be36555 | 3771 | lock_sock(sk); |
1da177e4 | 3772 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3773 | release_sock(sk); |
1da177e4 | 3774 | |
61d6ef3e | 3775 | l2cap_chan_hold(chan); |
48454079 | 3776 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3777 | |
3778 | l2cap_chan_unlock(chan); | |
1da177e4 | 3779 | |
80b98027 | 3780 | chan->ops->close(chan); |
61d6ef3e | 3781 | l2cap_chan_put(chan); |
3df91ea2 AE |
3782 | |
3783 | mutex_unlock(&conn->chan_lock); | |
3784 | ||
1da177e4 LT |
3785 | return 0; |
3786 | } | |
3787 | ||
3788 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3789 | { | |
3790 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3791 | u16 dcid, scid; | |
48454079 | 3792 | struct l2cap_chan *chan; |
1da177e4 LT |
3793 | |
3794 | scid = __le16_to_cpu(rsp->scid); | |
3795 | dcid = __le16_to_cpu(rsp->dcid); | |
3796 | ||
3797 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3798 | ||
3df91ea2 AE |
3799 | mutex_lock(&conn->chan_lock); |
3800 | ||
3801 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3802 | if (!chan) { | |
3803 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3804 | return 0; |
3df91ea2 | 3805 | } |
1da177e4 | 3806 | |
6be36555 | 3807 | l2cap_chan_lock(chan); |
48454079 | 3808 | |
61d6ef3e | 3809 | l2cap_chan_hold(chan); |
48454079 | 3810 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3811 | |
3812 | l2cap_chan_unlock(chan); | |
1da177e4 | 3813 | |
80b98027 | 3814 | chan->ops->close(chan); |
61d6ef3e | 3815 | l2cap_chan_put(chan); |
3df91ea2 AE |
3816 | |
3817 | mutex_unlock(&conn->chan_lock); | |
3818 | ||
1da177e4 LT |
3819 | return 0; |
3820 | } | |
3821 | ||
3822 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3823 | { | |
3824 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3825 | u16 type; |
3826 | ||
3827 | type = __le16_to_cpu(req->type); | |
3828 | ||
3829 | BT_DBG("type 0x%4.4x", type); | |
3830 | ||
f0709e03 MH |
3831 | if (type == L2CAP_IT_FEAT_MASK) { |
3832 | u8 buf[8]; | |
44dd46de | 3833 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3834 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3835 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3836 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3837 | if (!disable_ertm) |
fcc203c3 GP |
3838 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3839 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3840 | if (enable_hs) |
6327eb98 AE |
3841 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3842 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3843 | |
1b7bf4ed | 3844 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3845 | l2cap_send_cmd(conn, cmd->ident, |
3846 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3847 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3848 | u8 buf[12]; | |
3849 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3850 | |
3851 | if (enable_hs) | |
3852 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3853 | else | |
3854 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3855 | ||
ac73498c AE |
3856 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3857 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3858 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3859 | l2cap_send_cmd(conn, cmd->ident, |
3860 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3861 | } else { |
3862 | struct l2cap_info_rsp rsp; | |
3863 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3864 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3865 | l2cap_send_cmd(conn, cmd->ident, |
3866 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3867 | } | |
1da177e4 LT |
3868 | |
3869 | return 0; | |
3870 | } | |
3871 | ||
3872 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3873 | { | |
3874 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3875 | u16 type, result; | |
3876 | ||
3877 | type = __le16_to_cpu(rsp->type); | |
3878 | result = __le16_to_cpu(rsp->result); | |
3879 | ||
3880 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3881 | ||
e90165be AE |
3882 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3883 | if (cmd->ident != conn->info_ident || | |
3884 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3885 | return 0; | |
3886 | ||
17cd3f37 | 3887 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3888 | |
adb08ede VT |
3889 | if (result != L2CAP_IR_SUCCESS) { |
3890 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3891 | conn->info_ident = 0; | |
3892 | ||
3893 | l2cap_conn_start(conn); | |
3894 | ||
3895 | return 0; | |
3896 | } | |
3897 | ||
978c93b9 AE |
3898 | switch (type) { |
3899 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3900 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3901 | |
47ec1dcd | 3902 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3903 | struct l2cap_info_req req; |
ac73498c | 3904 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3905 | |
3906 | conn->info_ident = l2cap_get_ident(conn); | |
3907 | ||
3908 | l2cap_send_cmd(conn, conn->info_ident, | |
3909 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3910 | } else { | |
3911 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3912 | conn->info_ident = 0; | |
3913 | ||
3914 | l2cap_conn_start(conn); | |
3915 | } | |
978c93b9 AE |
3916 | break; |
3917 | ||
3918 | case L2CAP_IT_FIXED_CHAN: | |
3919 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3920 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3921 | conn->info_ident = 0; |
984947dc MH |
3922 | |
3923 | l2cap_conn_start(conn); | |
978c93b9 | 3924 | break; |
984947dc | 3925 | } |
4e8402a3 | 3926 | |
1da177e4 LT |
3927 | return 0; |
3928 | } | |
3929 | ||
f94ff6ff MM |
3930 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3931 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3932 | void *data) | |
3933 | { | |
3934 | struct l2cap_create_chan_req *req = data; | |
3935 | struct l2cap_create_chan_rsp rsp; | |
3936 | u16 psm, scid; | |
3937 | ||
3938 | if (cmd_len != sizeof(*req)) | |
3939 | return -EPROTO; | |
3940 | ||
3941 | if (!enable_hs) | |
3942 | return -EINVAL; | |
3943 | ||
3944 | psm = le16_to_cpu(req->psm); | |
3945 | scid = le16_to_cpu(req->scid); | |
3946 | ||
3947 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3948 | ||
3949 | /* Placeholder: Always reject */ | |
3950 | rsp.dcid = 0; | |
3951 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3952 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3953 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3954 | |
3955 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3956 | sizeof(rsp), &rsp); | |
3957 | ||
3958 | return 0; | |
3959 | } | |
3960 | ||
3961 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3962 | struct l2cap_cmd_hdr *cmd, void *data) | |
3963 | { | |
3964 | BT_DBG("conn %p", conn); | |
3965 | ||
3966 | return l2cap_connect_rsp(conn, cmd, data); | |
3967 | } | |
3968 | ||
8d5a04a1 MM |
3969 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3970 | u16 icid, u16 result) | |
3971 | { | |
3972 | struct l2cap_move_chan_rsp rsp; | |
3973 | ||
3974 | BT_DBG("icid %d, result %d", icid, result); | |
3975 | ||
3976 | rsp.icid = cpu_to_le16(icid); | |
3977 | rsp.result = cpu_to_le16(result); | |
3978 | ||
3979 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3980 | } | |
3981 | ||
3982 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3983 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3984 | { | |
3985 | struct l2cap_move_chan_cfm cfm; | |
3986 | u8 ident; | |
3987 | ||
3988 | BT_DBG("icid %d, result %d", icid, result); | |
3989 | ||
3990 | ident = l2cap_get_ident(conn); | |
3991 | if (chan) | |
3992 | chan->ident = ident; | |
3993 | ||
3994 | cfm.icid = cpu_to_le16(icid); | |
3995 | cfm.result = cpu_to_le16(result); | |
3996 | ||
3997 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3998 | } | |
3999 | ||
4000 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
4001 | u16 icid) | |
4002 | { | |
4003 | struct l2cap_move_chan_cfm_rsp rsp; | |
4004 | ||
4005 | BT_DBG("icid %d", icid); | |
4006 | ||
4007 | rsp.icid = cpu_to_le16(icid); | |
4008 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4009 | } | |
4010 | ||
4011 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
4012 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4013 | { | |
4014 | struct l2cap_move_chan_req *req = data; | |
4015 | u16 icid = 0; | |
4016 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4017 | ||
4018 | if (cmd_len != sizeof(*req)) | |
4019 | return -EPROTO; | |
4020 | ||
4021 | icid = le16_to_cpu(req->icid); | |
4022 | ||
4023 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
4024 | ||
4025 | if (!enable_hs) | |
4026 | return -EINVAL; | |
4027 | ||
4028 | /* Placeholder: Always refuse */ | |
4029 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4030 | ||
4031 | return 0; | |
4032 | } | |
4033 | ||
4034 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
4035 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4036 | { | |
4037 | struct l2cap_move_chan_rsp *rsp = data; | |
4038 | u16 icid, result; | |
4039 | ||
4040 | if (cmd_len != sizeof(*rsp)) | |
4041 | return -EPROTO; | |
4042 | ||
4043 | icid = le16_to_cpu(rsp->icid); | |
4044 | result = le16_to_cpu(rsp->result); | |
4045 | ||
4046 | BT_DBG("icid %d, result %d", icid, result); | |
4047 | ||
4048 | /* Placeholder: Always unconfirmed */ | |
4049 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4050 | ||
4051 | return 0; | |
4052 | } | |
4053 | ||
4054 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
4055 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4056 | { | |
4057 | struct l2cap_move_chan_cfm *cfm = data; | |
4058 | u16 icid, result; | |
4059 | ||
4060 | if (cmd_len != sizeof(*cfm)) | |
4061 | return -EPROTO; | |
4062 | ||
4063 | icid = le16_to_cpu(cfm->icid); | |
4064 | result = le16_to_cpu(cfm->result); | |
4065 | ||
4066 | BT_DBG("icid %d, result %d", icid, result); | |
4067 | ||
4068 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4069 | ||
4070 | return 0; | |
4071 | } | |
4072 | ||
4073 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
4074 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4075 | { | |
4076 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4077 | u16 icid; | |
4078 | ||
4079 | if (cmd_len != sizeof(*rsp)) | |
4080 | return -EPROTO; | |
4081 | ||
4082 | icid = le16_to_cpu(rsp->icid); | |
4083 | ||
4084 | BT_DBG("icid %d", icid); | |
4085 | ||
4086 | return 0; | |
4087 | } | |
4088 | ||
e2174ca4 | 4089 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4090 | u16 to_multiplier) |
4091 | { | |
4092 | u16 max_latency; | |
4093 | ||
4094 | if (min > max || min < 6 || max > 3200) | |
4095 | return -EINVAL; | |
4096 | ||
4097 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4098 | return -EINVAL; | |
4099 | ||
4100 | if (max >= to_multiplier * 8) | |
4101 | return -EINVAL; | |
4102 | ||
4103 | max_latency = (to_multiplier * 8 / max) - 1; | |
4104 | if (latency > 499 || latency > max_latency) | |
4105 | return -EINVAL; | |
4106 | ||
4107 | return 0; | |
4108 | } | |
4109 | ||
4110 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4111 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4112 | { | |
4113 | struct hci_conn *hcon = conn->hcon; | |
4114 | struct l2cap_conn_param_update_req *req; | |
4115 | struct l2cap_conn_param_update_rsp rsp; | |
4116 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4117 | int err; |
de73115a CT |
4118 | |
4119 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4120 | return -EINVAL; | |
4121 | ||
4122 | cmd_len = __le16_to_cpu(cmd->len); | |
4123 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4124 | return -EPROTO; | |
4125 | ||
4126 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4127 | min = __le16_to_cpu(req->min); |
4128 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4129 | latency = __le16_to_cpu(req->latency); |
4130 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4131 | ||
4132 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4133 | min, max, latency, to_multiplier); | |
4134 | ||
4135 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4136 | |
4137 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4138 | if (err) | |
ac73498c | 4139 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4140 | else |
ac73498c | 4141 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4142 | |
4143 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4144 | sizeof(rsp), &rsp); | |
4145 | ||
2ce603eb CT |
4146 | if (!err) |
4147 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4148 | ||
de73115a CT |
4149 | return 0; |
4150 | } | |
4151 | ||
3300d9a9 CT |
4152 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4153 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4154 | { | |
4155 | int err = 0; | |
4156 | ||
4157 | switch (cmd->code) { | |
4158 | case L2CAP_COMMAND_REJ: | |
4159 | l2cap_command_rej(conn, cmd, data); | |
4160 | break; | |
4161 | ||
4162 | case L2CAP_CONN_REQ: | |
4163 | err = l2cap_connect_req(conn, cmd, data); | |
4164 | break; | |
4165 | ||
4166 | case L2CAP_CONN_RSP: | |
4167 | err = l2cap_connect_rsp(conn, cmd, data); | |
4168 | break; | |
4169 | ||
4170 | case L2CAP_CONF_REQ: | |
4171 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4172 | break; | |
4173 | ||
4174 | case L2CAP_CONF_RSP: | |
4175 | err = l2cap_config_rsp(conn, cmd, data); | |
4176 | break; | |
4177 | ||
4178 | case L2CAP_DISCONN_REQ: | |
4179 | err = l2cap_disconnect_req(conn, cmd, data); | |
4180 | break; | |
4181 | ||
4182 | case L2CAP_DISCONN_RSP: | |
4183 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4184 | break; | |
4185 | ||
4186 | case L2CAP_ECHO_REQ: | |
4187 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4188 | break; | |
4189 | ||
4190 | case L2CAP_ECHO_RSP: | |
4191 | break; | |
4192 | ||
4193 | case L2CAP_INFO_REQ: | |
4194 | err = l2cap_information_req(conn, cmd, data); | |
4195 | break; | |
4196 | ||
4197 | case L2CAP_INFO_RSP: | |
4198 | err = l2cap_information_rsp(conn, cmd, data); | |
4199 | break; | |
4200 | ||
f94ff6ff MM |
4201 | case L2CAP_CREATE_CHAN_REQ: |
4202 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4203 | break; | |
4204 | ||
4205 | case L2CAP_CREATE_CHAN_RSP: | |
4206 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4207 | break; | |
4208 | ||
8d5a04a1 MM |
4209 | case L2CAP_MOVE_CHAN_REQ: |
4210 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4211 | break; | |
4212 | ||
4213 | case L2CAP_MOVE_CHAN_RSP: | |
4214 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4215 | break; | |
4216 | ||
4217 | case L2CAP_MOVE_CHAN_CFM: | |
4218 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4219 | break; | |
4220 | ||
4221 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4222 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4223 | break; | |
4224 | ||
3300d9a9 CT |
4225 | default: |
4226 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4227 | err = -EINVAL; | |
4228 | break; | |
4229 | } | |
4230 | ||
4231 | return err; | |
4232 | } | |
4233 | ||
4234 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4235 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4236 | { | |
4237 | switch (cmd->code) { | |
4238 | case L2CAP_COMMAND_REJ: | |
4239 | return 0; | |
4240 | ||
4241 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4242 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4243 | |
4244 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4245 | return 0; | |
4246 | ||
4247 | default: | |
4248 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4249 | return -EINVAL; | |
4250 | } | |
4251 | } | |
4252 | ||
4253 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4254 | struct sk_buff *skb) | |
1da177e4 LT |
4255 | { |
4256 | u8 *data = skb->data; | |
4257 | int len = skb->len; | |
4258 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4259 | int err; |
1da177e4 LT |
4260 | |
4261 | l2cap_raw_recv(conn, skb); | |
4262 | ||
4263 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4264 | u16 cmd_len; |
1da177e4 LT |
4265 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4266 | data += L2CAP_CMD_HDR_SIZE; | |
4267 | len -= L2CAP_CMD_HDR_SIZE; | |
4268 | ||
88219a0f | 4269 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4270 | |
88219a0f | 4271 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4272 | |
88219a0f | 4273 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4274 | BT_DBG("corrupted command"); |
4275 | break; | |
4276 | } | |
4277 | ||
3300d9a9 CT |
4278 | if (conn->hcon->type == LE_LINK) |
4279 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4280 | else | |
4281 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4282 | |
4283 | if (err) { | |
e2fd318e | 4284 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4285 | |
4286 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4287 | |
4288 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4289 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4290 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4291 | } | |
4292 | ||
88219a0f AV |
4293 | data += cmd_len; |
4294 | len -= cmd_len; | |
1da177e4 LT |
4295 | } |
4296 | ||
4297 | kfree_skb(skb); | |
4298 | } | |
4299 | ||
47d1ec61 | 4300 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4301 | { |
4302 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4303 | int hdr_size; |
4304 | ||
4305 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4306 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4307 | else | |
4308 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4309 | |
47d1ec61 | 4310 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4311 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4312 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4313 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4314 | ||
4315 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4316 | return -EBADMSG; |
fcc203c3 GP |
4317 | } |
4318 | return 0; | |
4319 | } | |
4320 | ||
6ea00485 | 4321 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4322 | { |
e31f7633 | 4323 | struct l2cap_ctrl control; |
d5392c8f | 4324 | |
e31f7633 | 4325 | BT_DBG("chan %p", chan); |
d5392c8f | 4326 | |
e31f7633 MM |
4327 | memset(&control, 0, sizeof(control)); |
4328 | control.sframe = 1; | |
4329 | control.final = 1; | |
4330 | control.reqseq = chan->buffer_seq; | |
4331 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4332 | |
e2ab4353 | 4333 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4334 | control.super = L2CAP_SUPER_RNR; |
4335 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4336 | } |
4337 | ||
e31f7633 MM |
4338 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4339 | chan->unacked_frames > 0) | |
4340 | __set_retrans_timer(chan); | |
d5392c8f | 4341 | |
e31f7633 | 4342 | /* Send pending iframes */ |
525cd185 | 4343 | l2cap_ertm_send(chan); |
d5392c8f | 4344 | |
e2ab4353 | 4345 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4346 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4347 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4348 | * send it now. | |
4349 | */ | |
4350 | control.super = L2CAP_SUPER_RR; | |
4351 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4352 | } |
4353 | } | |
4354 | ||
84084a31 MM |
4355 | static void append_skb_frag(struct sk_buff *skb, |
4356 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4357 | { |
84084a31 MM |
4358 | /* skb->len reflects data in skb as well as all fragments |
4359 | * skb->data_len reflects only data in fragments | |
4360 | */ | |
4361 | if (!skb_has_frag_list(skb)) | |
4362 | skb_shinfo(skb)->frag_list = new_frag; | |
4363 | ||
4364 | new_frag->next = NULL; | |
4365 | ||
4366 | (*last_frag)->next = new_frag; | |
4367 | *last_frag = new_frag; | |
4368 | ||
4369 | skb->len += new_frag->len; | |
4370 | skb->data_len += new_frag->len; | |
4371 | skb->truesize += new_frag->truesize; | |
4372 | } | |
4373 | ||
4b51dae9 MM |
4374 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4375 | struct l2cap_ctrl *control) | |
84084a31 MM |
4376 | { |
4377 | int err = -EINVAL; | |
18778a63 | 4378 | |
4b51dae9 | 4379 | switch (control->sar) { |
7e0ef6ee | 4380 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4381 | if (chan->sdu) |
4382 | break; | |
18778a63 | 4383 | |
80b98027 | 4384 | err = chan->ops->recv(chan, skb); |
84084a31 | 4385 | break; |
18778a63 | 4386 | |
7e0ef6ee | 4387 | case L2CAP_SAR_START: |
84084a31 MM |
4388 | if (chan->sdu) |
4389 | break; | |
18778a63 | 4390 | |
6f61fd47 | 4391 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4392 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4393 | |
84084a31 MM |
4394 | if (chan->sdu_len > chan->imtu) { |
4395 | err = -EMSGSIZE; | |
4396 | break; | |
4397 | } | |
1890d36b | 4398 | |
84084a31 MM |
4399 | if (skb->len >= chan->sdu_len) |
4400 | break; | |
18778a63 | 4401 | |
84084a31 MM |
4402 | chan->sdu = skb; |
4403 | chan->sdu_last_frag = skb; | |
18778a63 | 4404 | |
84084a31 MM |
4405 | skb = NULL; |
4406 | err = 0; | |
18778a63 GP |
4407 | break; |
4408 | ||
7e0ef6ee | 4409 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4410 | if (!chan->sdu) |
84084a31 | 4411 | break; |
18778a63 | 4412 | |
84084a31 MM |
4413 | append_skb_frag(chan->sdu, skb, |
4414 | &chan->sdu_last_frag); | |
4415 | skb = NULL; | |
18778a63 | 4416 | |
84084a31 MM |
4417 | if (chan->sdu->len >= chan->sdu_len) |
4418 | break; | |
4178ba46 | 4419 | |
84084a31 | 4420 | err = 0; |
18778a63 GP |
4421 | break; |
4422 | ||
7e0ef6ee | 4423 | case L2CAP_SAR_END: |
6f61fd47 | 4424 | if (!chan->sdu) |
84084a31 | 4425 | break; |
18778a63 | 4426 | |
84084a31 MM |
4427 | append_skb_frag(chan->sdu, skb, |
4428 | &chan->sdu_last_frag); | |
4429 | skb = NULL; | |
4178ba46 | 4430 | |
84084a31 MM |
4431 | if (chan->sdu->len != chan->sdu_len) |
4432 | break; | |
18778a63 | 4433 | |
80b98027 | 4434 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4435 | |
84084a31 MM |
4436 | if (!err) { |
4437 | /* Reassembly complete */ | |
4438 | chan->sdu = NULL; | |
4439 | chan->sdu_last_frag = NULL; | |
4440 | chan->sdu_len = 0; | |
1890d36b | 4441 | } |
18778a63 GP |
4442 | break; |
4443 | } | |
4444 | ||
84084a31 MM |
4445 | if (err) { |
4446 | kfree_skb(skb); | |
4447 | kfree_skb(chan->sdu); | |
4448 | chan->sdu = NULL; | |
4449 | chan->sdu_last_frag = NULL; | |
4450 | chan->sdu_len = 0; | |
4451 | } | |
18778a63 | 4452 | |
84084a31 | 4453 | return err; |
18778a63 GP |
4454 | } |
4455 | ||
61aa4f5b | 4456 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4457 | { |
61aa4f5b | 4458 | u8 event; |
712132eb | 4459 | |
61aa4f5b MM |
4460 | if (chan->mode != L2CAP_MODE_ERTM) |
4461 | return; | |
712132eb | 4462 | |
61aa4f5b | 4463 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4464 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4465 | } |
4466 | ||
d2a7ac5d MM |
4467 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4468 | { | |
63838725 MM |
4469 | int err = 0; |
4470 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4471 | * until a gap is encountered. | |
4472 | */ | |
4473 | ||
4474 | BT_DBG("chan %p", chan); | |
4475 | ||
4476 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4477 | struct sk_buff *skb; | |
4478 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4479 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4480 | ||
4481 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4482 | ||
4483 | if (!skb) | |
4484 | break; | |
4485 | ||
4486 | skb_unlink(skb, &chan->srej_q); | |
4487 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4488 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4489 | if (err) | |
4490 | break; | |
4491 | } | |
4492 | ||
4493 | if (skb_queue_empty(&chan->srej_q)) { | |
4494 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4495 | l2cap_send_ack(chan); | |
4496 | } | |
4497 | ||
4498 | return err; | |
d2a7ac5d MM |
4499 | } |
4500 | ||
4501 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4502 | struct l2cap_ctrl *control) | |
4503 | { | |
f80842a8 MM |
4504 | struct sk_buff *skb; |
4505 | ||
4506 | BT_DBG("chan %p, control %p", chan, control); | |
4507 | ||
4508 | if (control->reqseq == chan->next_tx_seq) { | |
4509 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4510 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4511 | return; | |
4512 | } | |
4513 | ||
4514 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4515 | ||
4516 | if (skb == NULL) { | |
4517 | BT_DBG("Seq %d not available for retransmission", | |
4518 | control->reqseq); | |
4519 | return; | |
4520 | } | |
4521 | ||
4522 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4523 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4524 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4525 | return; | |
4526 | } | |
4527 | ||
4528 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4529 | ||
4530 | if (control->poll) { | |
4531 | l2cap_pass_to_tx(chan, control); | |
4532 | ||
4533 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4534 | l2cap_retransmit(chan, control); | |
4535 | l2cap_ertm_send(chan); | |
4536 | ||
4537 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4538 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4539 | chan->srej_save_reqseq = control->reqseq; | |
4540 | } | |
4541 | } else { | |
4542 | l2cap_pass_to_tx_fbit(chan, control); | |
4543 | ||
4544 | if (control->final) { | |
4545 | if (chan->srej_save_reqseq != control->reqseq || | |
4546 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4547 | &chan->conn_state)) | |
4548 | l2cap_retransmit(chan, control); | |
4549 | } else { | |
4550 | l2cap_retransmit(chan, control); | |
4551 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4552 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4553 | chan->srej_save_reqseq = control->reqseq; | |
4554 | } | |
4555 | } | |
4556 | } | |
d2a7ac5d MM |
4557 | } |
4558 | ||
4559 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4560 | struct l2cap_ctrl *control) | |
4561 | { | |
fcd289df MM |
4562 | struct sk_buff *skb; |
4563 | ||
4564 | BT_DBG("chan %p, control %p", chan, control); | |
4565 | ||
4566 | if (control->reqseq == chan->next_tx_seq) { | |
4567 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4568 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4569 | return; | |
4570 | } | |
4571 | ||
4572 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4573 | ||
4574 | if (chan->max_tx && skb && | |
4575 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4576 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4577 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4578 | return; | |
4579 | } | |
4580 | ||
4581 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4582 | ||
4583 | l2cap_pass_to_tx(chan, control); | |
4584 | ||
4585 | if (control->final) { | |
4586 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4587 | l2cap_retransmit_all(chan, control); | |
4588 | } else { | |
4589 | l2cap_retransmit_all(chan, control); | |
4590 | l2cap_ertm_send(chan); | |
4591 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4592 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4593 | } | |
d2a7ac5d MM |
4594 | } |
4595 | ||
4b51dae9 MM |
4596 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4597 | { | |
4598 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4599 | ||
4600 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4601 | chan->expected_tx_seq); | |
4602 | ||
4603 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4604 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4605 | chan->tx_win) { | |
4606 | /* See notes below regarding "double poll" and | |
4607 | * invalid packets. | |
4608 | */ | |
4609 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4610 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4611 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4612 | } else { | |
4613 | BT_DBG("Invalid - in window after SREJ sent"); | |
4614 | return L2CAP_TXSEQ_INVALID; | |
4615 | } | |
4616 | } | |
4617 | ||
4618 | if (chan->srej_list.head == txseq) { | |
4619 | BT_DBG("Expected SREJ"); | |
4620 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4621 | } | |
4622 | ||
4623 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4624 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4625 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4626 | } | |
4627 | ||
4628 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4629 | BT_DBG("Unexpected SREJ - not requested"); | |
4630 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4631 | } | |
4632 | } | |
4633 | ||
4634 | if (chan->expected_tx_seq == txseq) { | |
4635 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4636 | chan->tx_win) { | |
4637 | BT_DBG("Invalid - txseq outside tx window"); | |
4638 | return L2CAP_TXSEQ_INVALID; | |
4639 | } else { | |
4640 | BT_DBG("Expected"); | |
4641 | return L2CAP_TXSEQ_EXPECTED; | |
4642 | } | |
4643 | } | |
4644 | ||
4645 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4646 | __seq_offset(chan, chan->expected_tx_seq, | |
4647 | chan->last_acked_seq)){ | |
4648 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4649 | return L2CAP_TXSEQ_DUPLICATE; | |
4650 | } | |
4651 | ||
4652 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4653 | /* A source of invalid packets is a "double poll" condition, | |
4654 | * where delays cause us to send multiple poll packets. If | |
4655 | * the remote stack receives and processes both polls, | |
4656 | * sequence numbers can wrap around in such a way that a | |
4657 | * resent frame has a sequence number that looks like new data | |
4658 | * with a sequence gap. This would trigger an erroneous SREJ | |
4659 | * request. | |
4660 | * | |
4661 | * Fortunately, this is impossible with a tx window that's | |
4662 | * less than half of the maximum sequence number, which allows | |
4663 | * invalid frames to be safely ignored. | |
4664 | * | |
4665 | * With tx window sizes greater than half of the tx window | |
4666 | * maximum, the frame is invalid and cannot be ignored. This | |
4667 | * causes a disconnect. | |
4668 | */ | |
4669 | ||
4670 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4671 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4672 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4673 | } else { | |
4674 | BT_DBG("Invalid - txseq outside tx window"); | |
4675 | return L2CAP_TXSEQ_INVALID; | |
4676 | } | |
4677 | } else { | |
4678 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4679 | return L2CAP_TXSEQ_UNEXPECTED; | |
4680 | } | |
4681 | } | |
4682 | ||
d2a7ac5d MM |
4683 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4684 | struct l2cap_ctrl *control, | |
4685 | struct sk_buff *skb, u8 event) | |
4686 | { | |
4687 | int err = 0; | |
4688 | bool skb_in_use = 0; | |
4689 | ||
4690 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4691 | event); | |
4692 | ||
4693 | switch (event) { | |
4694 | case L2CAP_EV_RECV_IFRAME: | |
4695 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4696 | case L2CAP_TXSEQ_EXPECTED: | |
4697 | l2cap_pass_to_tx(chan, control); | |
4698 | ||
4699 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4700 | BT_DBG("Busy, discarding expected seq %d", | |
4701 | control->txseq); | |
4702 | break; | |
4703 | } | |
4704 | ||
4705 | chan->expected_tx_seq = __next_seq(chan, | |
4706 | control->txseq); | |
4707 | ||
4708 | chan->buffer_seq = chan->expected_tx_seq; | |
4709 | skb_in_use = 1; | |
4710 | ||
4711 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4712 | if (err) | |
4713 | break; | |
4714 | ||
4715 | if (control->final) { | |
4716 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4717 | &chan->conn_state)) { | |
4718 | control->final = 0; | |
4719 | l2cap_retransmit_all(chan, control); | |
4720 | l2cap_ertm_send(chan); | |
4721 | } | |
4722 | } | |
4723 | ||
4724 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4725 | l2cap_send_ack(chan); | |
4726 | break; | |
4727 | case L2CAP_TXSEQ_UNEXPECTED: | |
4728 | l2cap_pass_to_tx(chan, control); | |
4729 | ||
4730 | /* Can't issue SREJ frames in the local busy state. | |
4731 | * Drop this frame, it will be seen as missing | |
4732 | * when local busy is exited. | |
4733 | */ | |
4734 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4735 | BT_DBG("Busy, discarding unexpected seq %d", | |
4736 | control->txseq); | |
4737 | break; | |
4738 | } | |
4739 | ||
4740 | /* There was a gap in the sequence, so an SREJ | |
4741 | * must be sent for each missing frame. The | |
4742 | * current frame is stored for later use. | |
4743 | */ | |
4744 | skb_queue_tail(&chan->srej_q, skb); | |
4745 | skb_in_use = 1; | |
4746 | BT_DBG("Queued %p (queue len %d)", skb, | |
4747 | skb_queue_len(&chan->srej_q)); | |
4748 | ||
4749 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4750 | l2cap_seq_list_clear(&chan->srej_list); | |
4751 | l2cap_send_srej(chan, control->txseq); | |
4752 | ||
4753 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4754 | break; | |
4755 | case L2CAP_TXSEQ_DUPLICATE: | |
4756 | l2cap_pass_to_tx(chan, control); | |
4757 | break; | |
4758 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4759 | break; | |
4760 | case L2CAP_TXSEQ_INVALID: | |
4761 | default: | |
4762 | l2cap_send_disconn_req(chan->conn, chan, | |
4763 | ECONNRESET); | |
4764 | break; | |
4765 | } | |
4766 | break; | |
4767 | case L2CAP_EV_RECV_RR: | |
4768 | l2cap_pass_to_tx(chan, control); | |
4769 | if (control->final) { | |
4770 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4771 | ||
4772 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4773 | &chan->conn_state)) { | |
4774 | control->final = 0; | |
4775 | l2cap_retransmit_all(chan, control); | |
4776 | } | |
4777 | ||
4778 | l2cap_ertm_send(chan); | |
4779 | } else if (control->poll) { | |
4780 | l2cap_send_i_or_rr_or_rnr(chan); | |
4781 | } else { | |
4782 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4783 | &chan->conn_state) && | |
4784 | chan->unacked_frames) | |
4785 | __set_retrans_timer(chan); | |
4786 | ||
4787 | l2cap_ertm_send(chan); | |
4788 | } | |
4789 | break; | |
4790 | case L2CAP_EV_RECV_RNR: | |
4791 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4792 | l2cap_pass_to_tx(chan, control); | |
4793 | if (control && control->poll) { | |
4794 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4795 | l2cap_send_rr_or_rnr(chan, 0); | |
4796 | } | |
4797 | __clear_retrans_timer(chan); | |
4798 | l2cap_seq_list_clear(&chan->retrans_list); | |
4799 | break; | |
4800 | case L2CAP_EV_RECV_REJ: | |
4801 | l2cap_handle_rej(chan, control); | |
4802 | break; | |
4803 | case L2CAP_EV_RECV_SREJ: | |
4804 | l2cap_handle_srej(chan, control); | |
4805 | break; | |
4806 | default: | |
4807 | break; | |
4808 | } | |
4809 | ||
4810 | if (skb && !skb_in_use) { | |
4811 | BT_DBG("Freeing %p", skb); | |
4812 | kfree_skb(skb); | |
4813 | } | |
4814 | ||
4815 | return err; | |
4816 | } | |
4817 | ||
4818 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4819 | struct l2cap_ctrl *control, | |
4820 | struct sk_buff *skb, u8 event) | |
4821 | { | |
4822 | int err = 0; | |
4823 | u16 txseq = control->txseq; | |
4824 | bool skb_in_use = 0; | |
4825 | ||
4826 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4827 | event); | |
4828 | ||
4829 | switch (event) { | |
4830 | case L2CAP_EV_RECV_IFRAME: | |
4831 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4832 | case L2CAP_TXSEQ_EXPECTED: | |
4833 | /* Keep frame for reassembly later */ | |
4834 | l2cap_pass_to_tx(chan, control); | |
4835 | skb_queue_tail(&chan->srej_q, skb); | |
4836 | skb_in_use = 1; | |
4837 | BT_DBG("Queued %p (queue len %d)", skb, | |
4838 | skb_queue_len(&chan->srej_q)); | |
4839 | ||
4840 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4841 | break; | |
4842 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4843 | l2cap_seq_list_pop(&chan->srej_list); | |
4844 | ||
4845 | l2cap_pass_to_tx(chan, control); | |
4846 | skb_queue_tail(&chan->srej_q, skb); | |
4847 | skb_in_use = 1; | |
4848 | BT_DBG("Queued %p (queue len %d)", skb, | |
4849 | skb_queue_len(&chan->srej_q)); | |
4850 | ||
4851 | err = l2cap_rx_queued_iframes(chan); | |
4852 | if (err) | |
4853 | break; | |
4854 | ||
4855 | break; | |
4856 | case L2CAP_TXSEQ_UNEXPECTED: | |
4857 | /* Got a frame that can't be reassembled yet. | |
4858 | * Save it for later, and send SREJs to cover | |
4859 | * the missing frames. | |
4860 | */ | |
4861 | skb_queue_tail(&chan->srej_q, skb); | |
4862 | skb_in_use = 1; | |
4863 | BT_DBG("Queued %p (queue len %d)", skb, | |
4864 | skb_queue_len(&chan->srej_q)); | |
4865 | ||
4866 | l2cap_pass_to_tx(chan, control); | |
4867 | l2cap_send_srej(chan, control->txseq); | |
4868 | break; | |
4869 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4870 | /* This frame was requested with an SREJ, but | |
4871 | * some expected retransmitted frames are | |
4872 | * missing. Request retransmission of missing | |
4873 | * SREJ'd frames. | |
4874 | */ | |
4875 | skb_queue_tail(&chan->srej_q, skb); | |
4876 | skb_in_use = 1; | |
4877 | BT_DBG("Queued %p (queue len %d)", skb, | |
4878 | skb_queue_len(&chan->srej_q)); | |
4879 | ||
4880 | l2cap_pass_to_tx(chan, control); | |
4881 | l2cap_send_srej_list(chan, control->txseq); | |
4882 | break; | |
4883 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4884 | /* We've already queued this frame. Drop this copy. */ | |
4885 | l2cap_pass_to_tx(chan, control); | |
4886 | break; | |
4887 | case L2CAP_TXSEQ_DUPLICATE: | |
4888 | /* Expecting a later sequence number, so this frame | |
4889 | * was already received. Ignore it completely. | |
4890 | */ | |
4891 | break; | |
4892 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4893 | break; | |
4894 | case L2CAP_TXSEQ_INVALID: | |
4895 | default: | |
4896 | l2cap_send_disconn_req(chan->conn, chan, | |
4897 | ECONNRESET); | |
4898 | break; | |
4899 | } | |
4900 | break; | |
4901 | case L2CAP_EV_RECV_RR: | |
4902 | l2cap_pass_to_tx(chan, control); | |
4903 | if (control->final) { | |
4904 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4905 | ||
4906 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4907 | &chan->conn_state)) { | |
4908 | control->final = 0; | |
4909 | l2cap_retransmit_all(chan, control); | |
4910 | } | |
4911 | ||
4912 | l2cap_ertm_send(chan); | |
4913 | } else if (control->poll) { | |
4914 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4915 | &chan->conn_state) && | |
4916 | chan->unacked_frames) { | |
4917 | __set_retrans_timer(chan); | |
4918 | } | |
4919 | ||
4920 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4921 | l2cap_send_srej_tail(chan); | |
4922 | } else { | |
4923 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4924 | &chan->conn_state) && | |
4925 | chan->unacked_frames) | |
4926 | __set_retrans_timer(chan); | |
4927 | ||
4928 | l2cap_send_ack(chan); | |
4929 | } | |
4930 | break; | |
4931 | case L2CAP_EV_RECV_RNR: | |
4932 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4933 | l2cap_pass_to_tx(chan, control); | |
4934 | if (control->poll) { | |
4935 | l2cap_send_srej_tail(chan); | |
4936 | } else { | |
4937 | struct l2cap_ctrl rr_control; | |
4938 | memset(&rr_control, 0, sizeof(rr_control)); | |
4939 | rr_control.sframe = 1; | |
4940 | rr_control.super = L2CAP_SUPER_RR; | |
4941 | rr_control.reqseq = chan->buffer_seq; | |
4942 | l2cap_send_sframe(chan, &rr_control); | |
4943 | } | |
4944 | ||
4945 | break; | |
4946 | case L2CAP_EV_RECV_REJ: | |
4947 | l2cap_handle_rej(chan, control); | |
4948 | break; | |
4949 | case L2CAP_EV_RECV_SREJ: | |
4950 | l2cap_handle_srej(chan, control); | |
4951 | break; | |
4952 | } | |
4953 | ||
4954 | if (skb && !skb_in_use) { | |
4955 | BT_DBG("Freeing %p", skb); | |
4956 | kfree_skb(skb); | |
4957 | } | |
4958 | ||
4959 | return err; | |
4960 | } | |
4961 | ||
4962 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
4963 | { | |
4964 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
4965 | u16 unacked; | |
4966 | ||
4967 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
4968 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
4969 | } | |
4970 | ||
cec8ab6e MM |
4971 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4972 | struct sk_buff *skb, u8 event) | |
218bb9df | 4973 | { |
d2a7ac5d MM |
4974 | int err = 0; |
4975 | ||
4976 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
4977 | control, skb, event, chan->rx_state); | |
4978 | ||
4979 | if (__valid_reqseq(chan, control->reqseq)) { | |
4980 | switch (chan->rx_state) { | |
4981 | case L2CAP_RX_STATE_RECV: | |
4982 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
4983 | break; | |
4984 | case L2CAP_RX_STATE_SREJ_SENT: | |
4985 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
4986 | event); | |
4987 | break; | |
4988 | default: | |
4989 | /* shut it down */ | |
4990 | break; | |
4991 | } | |
4992 | } else { | |
4993 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
4994 | control->reqseq, chan->next_tx_seq, | |
4995 | chan->expected_ack_seq); | |
4996 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4997 | } | |
4998 | ||
4999 | return err; | |
cec8ab6e MM |
5000 | } |
5001 | ||
5002 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5003 | struct sk_buff *skb) | |
5004 | { | |
4b51dae9 MM |
5005 | int err = 0; |
5006 | ||
5007 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5008 | chan->rx_state); | |
5009 | ||
5010 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5011 | L2CAP_TXSEQ_EXPECTED) { | |
5012 | l2cap_pass_to_tx(chan, control); | |
5013 | ||
5014 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5015 | __next_seq(chan, chan->buffer_seq)); | |
5016 | ||
5017 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5018 | ||
5019 | l2cap_reassemble_sdu(chan, skb, control); | |
5020 | } else { | |
5021 | if (chan->sdu) { | |
5022 | kfree_skb(chan->sdu); | |
5023 | chan->sdu = NULL; | |
5024 | } | |
5025 | chan->sdu_last_frag = NULL; | |
5026 | chan->sdu_len = 0; | |
5027 | ||
5028 | if (skb) { | |
5029 | BT_DBG("Freeing %p", skb); | |
5030 | kfree_skb(skb); | |
5031 | } | |
5032 | } | |
5033 | ||
5034 | chan->last_acked_seq = control->txseq; | |
5035 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5036 | ||
5037 | return err; | |
cec8ab6e MM |
5038 | } |
5039 | ||
5040 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5041 | { | |
5042 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5043 | u16 len; | |
5044 | u8 event; | |
218bb9df | 5045 | |
b76bbd66 MM |
5046 | __unpack_control(chan, skb); |
5047 | ||
218bb9df GP |
5048 | len = skb->len; |
5049 | ||
5050 | /* | |
5051 | * We can just drop the corrupted I-frame here. | |
5052 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5053 | * procedures and ask for retransmission. |
218bb9df | 5054 | */ |
47d1ec61 | 5055 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5056 | goto drop; |
5057 | ||
cec8ab6e | 5058 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5059 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5060 | |
47d1ec61 | 5061 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5062 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5063 | |
47d1ec61 | 5064 | if (len > chan->mps) { |
8c1d787b | 5065 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5066 | goto drop; |
5067 | } | |
5068 | ||
cec8ab6e MM |
5069 | if (!control->sframe) { |
5070 | int err; | |
218bb9df | 5071 | |
cec8ab6e MM |
5072 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5073 | control->sar, control->reqseq, control->final, | |
5074 | control->txseq); | |
218bb9df | 5075 | |
cec8ab6e MM |
5076 | /* Validate F-bit - F=0 always valid, F=1 only |
5077 | * valid in TX WAIT_F | |
5078 | */ | |
5079 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5080 | goto drop; |
cec8ab6e MM |
5081 | |
5082 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5083 | event = L2CAP_EV_RECV_IFRAME; | |
5084 | err = l2cap_rx(chan, control, skb, event); | |
5085 | } else { | |
5086 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5087 | } |
5088 | ||
cec8ab6e MM |
5089 | if (err) |
5090 | l2cap_send_disconn_req(chan->conn, chan, | |
5091 | ECONNRESET); | |
218bb9df | 5092 | } else { |
cec8ab6e MM |
5093 | const u8 rx_func_to_event[4] = { |
5094 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5095 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5096 | }; | |
5097 | ||
5098 | /* Only I-frames are expected in streaming mode */ | |
5099 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5100 | goto drop; | |
5101 | ||
5102 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5103 | control->reqseq, control->final, control->poll, | |
5104 | control->super); | |
5105 | ||
218bb9df GP |
5106 | if (len != 0) { |
5107 | BT_ERR("%d", len); | |
8c1d787b | 5108 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5109 | goto drop; |
5110 | } | |
5111 | ||
cec8ab6e MM |
5112 | /* Validate F and P bits */ |
5113 | if (control->final && (control->poll || | |
5114 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5115 | goto drop; | |
5116 | ||
5117 | event = rx_func_to_event[control->super]; | |
5118 | if (l2cap_rx(chan, control, skb, event)) | |
5119 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5120 | } |
5121 | ||
5122 | return 0; | |
5123 | ||
5124 | drop: | |
5125 | kfree_skb(skb); | |
5126 | return 0; | |
5127 | } | |
5128 | ||
1da177e4 LT |
5129 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
5130 | { | |
48454079 | 5131 | struct l2cap_chan *chan; |
1da177e4 | 5132 | |
baa7e1fa | 5133 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5134 | if (!chan) { |
1da177e4 | 5135 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 5136 | /* Drop packet and return */ |
3379013b | 5137 | kfree_skb(skb); |
6be36555 | 5138 | return 0; |
1da177e4 LT |
5139 | } |
5140 | ||
49208c9c | 5141 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5142 | |
89bc500e | 5143 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5144 | goto drop; |
5145 | ||
0c1bc5c6 | 5146 | switch (chan->mode) { |
1c2acffb GP |
5147 | case L2CAP_MODE_BASIC: |
5148 | /* If socket recv buffers overflows we drop data here | |
5149 | * which is *bad* because L2CAP has to be reliable. | |
5150 | * But we don't have any other choice. L2CAP doesn't | |
5151 | * provide flow control mechanism. */ | |
1da177e4 | 5152 | |
0c1bc5c6 | 5153 | if (chan->imtu < skb->len) |
1c2acffb | 5154 | goto drop; |
1da177e4 | 5155 | |
80b98027 | 5156 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5157 | goto done; |
5158 | break; | |
5159 | ||
5160 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5161 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5162 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5163 | goto done; |
5164 | ||
1c2acffb | 5165 | default: |
0c1bc5c6 | 5166 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5167 | break; |
5168 | } | |
1da177e4 LT |
5169 | |
5170 | drop: | |
5171 | kfree_skb(skb); | |
5172 | ||
5173 | done: | |
6be36555 | 5174 | l2cap_chan_unlock(chan); |
0139418c | 5175 | |
1da177e4 LT |
5176 | return 0; |
5177 | } | |
5178 | ||
8e036fc3 | 5179 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 5180 | { |
23691d75 | 5181 | struct l2cap_chan *chan; |
1da177e4 | 5182 | |
c2287681 | 5183 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5184 | if (!chan) |
1da177e4 LT |
5185 | goto drop; |
5186 | ||
5b4cedaa | 5187 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5188 | |
89bc500e | 5189 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5190 | goto drop; |
5191 | ||
e13e21dc | 5192 | if (chan->imtu < skb->len) |
1da177e4 LT |
5193 | goto drop; |
5194 | ||
80b98027 | 5195 | if (!chan->ops->recv(chan, skb)) |
5b4cedaa | 5196 | return 0; |
1da177e4 LT |
5197 | |
5198 | drop: | |
5199 | kfree_skb(skb); | |
5200 | ||
1da177e4 LT |
5201 | return 0; |
5202 | } | |
5203 | ||
d9b88702 AE |
5204 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5205 | struct sk_buff *skb) | |
9f69bda6 | 5206 | { |
23691d75 | 5207 | struct l2cap_chan *chan; |
9f69bda6 | 5208 | |
c2287681 | 5209 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5210 | if (!chan) |
9f69bda6 GP |
5211 | goto drop; |
5212 | ||
5b4cedaa | 5213 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5214 | |
89bc500e | 5215 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5216 | goto drop; |
5217 | ||
e13e21dc | 5218 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5219 | goto drop; |
5220 | ||
80b98027 | 5221 | if (!chan->ops->recv(chan, skb)) |
5b4cedaa | 5222 | return 0; |
9f69bda6 GP |
5223 | |
5224 | drop: | |
5225 | kfree_skb(skb); | |
5226 | ||
9f69bda6 GP |
5227 | return 0; |
5228 | } | |
5229 | ||
1da177e4 LT |
5230 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5231 | { | |
5232 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5233 | u16 cid, len; |
5234 | __le16 psm; | |
1da177e4 LT |
5235 | |
5236 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5237 | cid = __le16_to_cpu(lh->cid); | |
5238 | len = __le16_to_cpu(lh->len); | |
5239 | ||
1c2acffb GP |
5240 | if (len != skb->len) { |
5241 | kfree_skb(skb); | |
5242 | return; | |
5243 | } | |
5244 | ||
1da177e4 LT |
5245 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5246 | ||
5247 | switch (cid) { | |
3300d9a9 | 5248 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5249 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5250 | l2cap_sig_channel(conn, skb); |
5251 | break; | |
5252 | ||
8db4dc46 | 5253 | case L2CAP_CID_CONN_LESS: |
097db76c | 5254 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5255 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5256 | l2cap_conless_channel(conn, psm, skb); |
5257 | break; | |
5258 | ||
9f69bda6 GP |
5259 | case L2CAP_CID_LE_DATA: |
5260 | l2cap_att_channel(conn, cid, skb); | |
5261 | break; | |
5262 | ||
b501d6a1 AB |
5263 | case L2CAP_CID_SMP: |
5264 | if (smp_sig_channel(conn, skb)) | |
5265 | l2cap_conn_del(conn->hcon, EACCES); | |
5266 | break; | |
5267 | ||
1da177e4 LT |
5268 | default: |
5269 | l2cap_data_channel(conn, cid, skb); | |
5270 | break; | |
5271 | } | |
5272 | } | |
5273 | ||
5274 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5275 | ||
686ebf28 | 5276 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5277 | { |
5278 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5279 | struct l2cap_chan *c; |
1da177e4 | 5280 | |
1da177e4 LT |
5281 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5282 | ||
5283 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5284 | read_lock(&chan_list_lock); |
5285 | list_for_each_entry(c, &chan_list, global_l) { | |
5286 | struct sock *sk = c->sk; | |
4343478f | 5287 | |
89bc500e | 5288 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5289 | continue; |
5290 | ||
5291 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5292 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5293 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5294 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5295 | exact++; |
2af6b9d5 MH |
5296 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5297 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5298 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5299 | lm2 |= HCI_LM_MASTER; |
5300 | } | |
1da177e4 | 5301 | } |
23691d75 | 5302 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5303 | |
5304 | return exact ? lm1 : lm2; | |
5305 | } | |
5306 | ||
686ebf28 | 5307 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5308 | { |
0139418c MH |
5309 | struct l2cap_conn *conn; |
5310 | ||
1da177e4 LT |
5311 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5312 | ||
1da177e4 | 5313 | if (!status) { |
1da177e4 LT |
5314 | conn = l2cap_conn_add(hcon, status); |
5315 | if (conn) | |
5316 | l2cap_conn_ready(conn); | |
0139418c | 5317 | } else |
e175072f | 5318 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5319 | |
5320 | return 0; | |
5321 | } | |
5322 | ||
686ebf28 | 5323 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5324 | { |
5325 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5326 | ||
5327 | BT_DBG("hcon %p", hcon); | |
5328 | ||
686ebf28 | 5329 | if (!conn) |
9f5a0d7b | 5330 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5331 | return conn->disc_reason; |
5332 | } | |
5333 | ||
686ebf28 | 5334 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5335 | { |
5336 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5337 | ||
e175072f | 5338 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5339 | return 0; |
5340 | } | |
5341 | ||
4343478f | 5342 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5343 | { |
715ec005 | 5344 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5345 | return; |
5346 | ||
f62e4323 | 5347 | if (encrypt == 0x00) { |
4343478f | 5348 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5349 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5350 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5351 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5352 | } else { |
4343478f | 5353 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5354 | __clear_chan_timer(chan); |
f62e4323 MH |
5355 | } |
5356 | } | |
5357 | ||
686ebf28 | 5358 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5359 | { |
0139418c | 5360 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5361 | struct l2cap_chan *chan; |
1da177e4 | 5362 | |
0139418c | 5363 | if (!conn) |
1da177e4 | 5364 | return 0; |
0139418c | 5365 | |
1da177e4 LT |
5366 | BT_DBG("conn %p", conn); |
5367 | ||
160dc6ac | 5368 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5369 | if (!status && encrypt) |
5370 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5371 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5372 | } |
5373 | ||
3df91ea2 | 5374 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5375 | |
3df91ea2 | 5376 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5377 | l2cap_chan_lock(chan); |
1da177e4 | 5378 | |
f1cb9af5 VCG |
5379 | BT_DBG("chan->scid %d", chan->scid); |
5380 | ||
5381 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5382 | if (!status && encrypt) { | |
5383 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5384 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5385 | } |
5386 | ||
6be36555 | 5387 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5388 | continue; |
5389 | } | |
5390 | ||
c1360a1c | 5391 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5392 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5393 | continue; |
5394 | } | |
5395 | ||
89bc500e GP |
5396 | if (!status && (chan->state == BT_CONNECTED || |
5397 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5398 | struct sock *sk = chan->sk; |
5399 | ||
c5daa683 | 5400 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5401 | sk->sk_state_change(sk); |
5402 | ||
4343478f | 5403 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5404 | l2cap_chan_unlock(chan); |
9719f8af MH |
5405 | continue; |
5406 | } | |
5407 | ||
89bc500e | 5408 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5409 | if (!status) { |
9b27f350 | 5410 | l2cap_send_conn_req(chan); |
b1235d79 | 5411 | } else { |
ba13ccd9 | 5412 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5413 | } |
89bc500e | 5414 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5415 | struct sock *sk = chan->sk; |
b1235d79 | 5416 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5417 | __u16 res, stat; |
1da177e4 | 5418 | |
6be36555 AE |
5419 | lock_sock(sk); |
5420 | ||
b1235d79 | 5421 | if (!status) { |
c5daa683 GP |
5422 | if (test_bit(BT_SK_DEFER_SETUP, |
5423 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5424 | struct sock *parent = bt_sk(sk)->parent; |
5425 | res = L2CAP_CR_PEND; | |
5426 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5427 | if (parent) |
5428 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5429 | } else { |
0e587be7 | 5430 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5431 | res = L2CAP_CR_SUCCESS; |
5432 | stat = L2CAP_CS_NO_INFO; | |
5433 | } | |
b1235d79 | 5434 | } else { |
0e587be7 | 5435 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5436 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5437 | res = L2CAP_CR_SEC_BLOCK; |
5438 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5439 | } |
5440 | ||
6be36555 AE |
5441 | release_sock(sk); |
5442 | ||
fe4128e0 GP |
5443 | rsp.scid = cpu_to_le16(chan->dcid); |
5444 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5445 | rsp.result = cpu_to_le16(res); |
5446 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5447 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5448 | sizeof(rsp), &rsp); | |
2d369359 MM |
5449 | |
5450 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5451 | res == L2CAP_CR_SUCCESS) { | |
5452 | char buf[128]; | |
5453 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5454 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5455 | L2CAP_CONF_REQ, | |
5456 | l2cap_build_conf_req(chan, buf), | |
5457 | buf); | |
5458 | chan->num_conf_req++; | |
5459 | } | |
b1235d79 | 5460 | } |
1da177e4 | 5461 | |
6be36555 | 5462 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5463 | } |
5464 | ||
3df91ea2 | 5465 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5466 | |
1da177e4 LT |
5467 | return 0; |
5468 | } | |
5469 | ||
686ebf28 | 5470 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5471 | { |
5472 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5473 | ||
5a08ecce AE |
5474 | if (!conn) |
5475 | conn = l2cap_conn_add(hcon, 0); | |
5476 | ||
5477 | if (!conn) | |
1da177e4 LT |
5478 | goto drop; |
5479 | ||
5480 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5481 | ||
e702112f | 5482 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5483 | struct l2cap_hdr *hdr; |
5484 | int len; | |
5485 | ||
5486 | if (conn->rx_len) { | |
5487 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5488 | kfree_skb(conn->rx_skb); | |
5489 | conn->rx_skb = NULL; | |
5490 | conn->rx_len = 0; | |
5491 | l2cap_conn_unreliable(conn, ECOMM); | |
5492 | } | |
5493 | ||
aae7fe22 AE |
5494 | /* Start fragment always begin with Basic L2CAP header */ |
5495 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5496 | BT_ERR("Frame is too short (len %d)", skb->len); |
5497 | l2cap_conn_unreliable(conn, ECOMM); | |
5498 | goto drop; | |
5499 | } | |
5500 | ||
5501 | hdr = (struct l2cap_hdr *) skb->data; | |
5502 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5503 | ||
5504 | if (len == skb->len) { | |
5505 | /* Complete frame received */ | |
5506 | l2cap_recv_frame(conn, skb); | |
5507 | return 0; | |
5508 | } | |
5509 | ||
5510 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5511 | ||
5512 | if (skb->len > len) { | |
5513 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5514 | skb->len, len); | |
5515 | l2cap_conn_unreliable(conn, ECOMM); | |
5516 | goto drop; | |
5517 | } | |
5518 | ||
5519 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5520 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5521 | if (!conn->rx_skb) | |
1da177e4 LT |
5522 | goto drop; |
5523 | ||
d626f62b | 5524 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5525 | skb->len); |
1da177e4 LT |
5526 | conn->rx_len = len - skb->len; |
5527 | } else { | |
5528 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5529 | ||
5530 | if (!conn->rx_len) { | |
5531 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5532 | l2cap_conn_unreliable(conn, ECOMM); | |
5533 | goto drop; | |
5534 | } | |
5535 | ||
5536 | if (skb->len > conn->rx_len) { | |
5537 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5538 | skb->len, conn->rx_len); | |
5539 | kfree_skb(conn->rx_skb); | |
5540 | conn->rx_skb = NULL; | |
5541 | conn->rx_len = 0; | |
5542 | l2cap_conn_unreliable(conn, ECOMM); | |
5543 | goto drop; | |
5544 | } | |
5545 | ||
d626f62b | 5546 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5547 | skb->len); |
1da177e4 LT |
5548 | conn->rx_len -= skb->len; |
5549 | ||
5550 | if (!conn->rx_len) { | |
5551 | /* Complete frame received */ | |
5552 | l2cap_recv_frame(conn, conn->rx_skb); | |
5553 | conn->rx_skb = NULL; | |
5554 | } | |
5555 | } | |
5556 | ||
5557 | drop: | |
5558 | kfree_skb(skb); | |
5559 | return 0; | |
5560 | } | |
5561 | ||
aef7d97c | 5562 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5563 | { |
23691d75 | 5564 | struct l2cap_chan *c; |
1da177e4 | 5565 | |
333055f2 | 5566 | read_lock(&chan_list_lock); |
1da177e4 | 5567 | |
23691d75 GP |
5568 | list_for_each_entry(c, &chan_list, global_l) { |
5569 | struct sock *sk = c->sk; | |
101545f6 | 5570 | |
903d343e | 5571 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5572 | batostr(&bt_sk(sk)->src), |
5573 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5574 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5575 | c->scid, c->dcid, c->imtu, c->omtu, |
5576 | c->sec_level, c->mode); | |
61e1b4b7 | 5577 | } |
1da177e4 | 5578 | |
333055f2 | 5579 | read_unlock(&chan_list_lock); |
1da177e4 | 5580 | |
aef7d97c | 5581 | return 0; |
1da177e4 LT |
5582 | } |
5583 | ||
aef7d97c MH |
5584 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5585 | { | |
5586 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5587 | } | |
5588 | ||
5589 | static const struct file_operations l2cap_debugfs_fops = { | |
5590 | .open = l2cap_debugfs_open, | |
5591 | .read = seq_read, | |
5592 | .llseek = seq_lseek, | |
5593 | .release = single_release, | |
5594 | }; | |
5595 | ||
5596 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5597 | |
64274518 | 5598 | int __init l2cap_init(void) |
1da177e4 LT |
5599 | { |
5600 | int err; | |
be9d1227 | 5601 | |
bb58f747 | 5602 | err = l2cap_init_sockets(); |
1da177e4 LT |
5603 | if (err < 0) |
5604 | return err; | |
5605 | ||
aef7d97c MH |
5606 | if (bt_debugfs) { |
5607 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5608 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5609 | if (!l2cap_debugfs) | |
5610 | BT_ERR("Failed to create L2CAP debug file"); | |
5611 | } | |
1da177e4 | 5612 | |
1da177e4 | 5613 | return 0; |
1da177e4 LT |
5614 | } |
5615 | ||
64274518 | 5616 | void l2cap_exit(void) |
1da177e4 | 5617 | { |
aef7d97c | 5618 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5619 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5620 | } |
5621 | ||
d1c4a17d GP |
5622 | module_param(disable_ertm, bool, 0644); |
5623 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |