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