Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 39 | #include <net/bluetooth/smp.h> |
97e8e89d | 40 | #include <net/bluetooth/a2mp.h> |
1da177e4 | 41 | |
d1de6d46 | 42 | bool disable_ertm; |
f0709e03 | 43 | |
47ec1dcd | 44 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 45 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 46 | |
b5ad8b7f JB |
47 | static LIST_HEAD(chan_list); |
48 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 49 | |
1da177e4 LT |
50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
51 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
53 | void *data); | |
710f9b0a | 54 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 55 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 56 | struct l2cap_chan *chan, int err); |
1da177e4 | 57 | |
d660366d | 58 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
59 | struct sk_buff_head *skbs, u8 event); |
60 | ||
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
baa7e1fa | 63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 64 | { |
3df91ea2 | 65 | struct l2cap_chan *c; |
3d57dc68 | 66 | |
3df91ea2 AE |
67 | list_for_each_entry(c, &conn->chan_l, list) { |
68 | if (c->dcid == cid) | |
69 | return c; | |
0139418c | 70 | } |
3df91ea2 | 71 | return NULL; |
0139418c MH |
72 | } |
73 | ||
baa7e1fa | 74 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 75 | { |
3df91ea2 | 76 | struct l2cap_chan *c; |
3d57dc68 | 77 | |
3df91ea2 AE |
78 | list_for_each_entry(c, &conn->chan_l, list) { |
79 | if (c->scid == cid) | |
80 | return c; | |
0139418c | 81 | } |
3df91ea2 | 82 | return NULL; |
0139418c MH |
83 | } |
84 | ||
85 | /* Find channel with given SCID. | |
ef191ade | 86 | * Returns locked channel. */ |
baa7e1fa | 87 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 88 | { |
48454079 | 89 | struct l2cap_chan *c; |
baa7e1fa | 90 | |
3df91ea2 | 91 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 92 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
93 | if (c) |
94 | l2cap_chan_lock(c); | |
3df91ea2 AE |
95 | mutex_unlock(&conn->chan_lock); |
96 | ||
48454079 | 97 | return c; |
0139418c MH |
98 | } |
99 | ||
baa7e1fa | 100 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 101 | { |
3df91ea2 | 102 | struct l2cap_chan *c; |
3d57dc68 | 103 | |
3df91ea2 AE |
104 | list_for_each_entry(c, &conn->chan_l, list) { |
105 | if (c->ident == ident) | |
106 | return c; | |
0139418c | 107 | } |
3df91ea2 | 108 | return NULL; |
0139418c MH |
109 | } |
110 | ||
23691d75 | 111 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 112 | { |
23691d75 | 113 | struct l2cap_chan *c; |
9e4425ff | 114 | |
23691d75 GP |
115 | list_for_each_entry(c, &chan_list, global_l) { |
116 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 117 | return c; |
9e4425ff | 118 | } |
250938cb | 119 | return NULL; |
9e4425ff GP |
120 | } |
121 | ||
122 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
123 | { | |
73b2ec18 GP |
124 | int err; |
125 | ||
333055f2 | 126 | write_lock(&chan_list_lock); |
9e4425ff | 127 | |
23691d75 | 128 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
129 | err = -EADDRINUSE; |
130 | goto done; | |
9e4425ff GP |
131 | } |
132 | ||
73b2ec18 GP |
133 | if (psm) { |
134 | chan->psm = psm; | |
135 | chan->sport = psm; | |
136 | err = 0; | |
137 | } else { | |
138 | u16 p; | |
139 | ||
140 | err = -EINVAL; | |
141 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 142 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
143 | chan->psm = cpu_to_le16(p); |
144 | chan->sport = cpu_to_le16(p); | |
145 | err = 0; | |
146 | break; | |
147 | } | |
148 | } | |
9e4425ff | 149 | |
73b2ec18 | 150 | done: |
333055f2 | 151 | write_unlock(&chan_list_lock); |
73b2ec18 | 152 | return err; |
9e4425ff GP |
153 | } |
154 | ||
155 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
156 | { | |
333055f2 | 157 | write_lock(&chan_list_lock); |
9e4425ff GP |
158 | |
159 | chan->scid = scid; | |
160 | ||
333055f2 | 161 | write_unlock(&chan_list_lock); |
9e4425ff GP |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
baa7e1fa | 166 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 167 | { |
8db4dc46 | 168 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 169 | |
8db4dc46 | 170 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 171 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
172 | return cid; |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
0e587be7 | 178 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 179 | { |
42d2d87c | 180 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
181 | state_to_string(state)); |
182 | ||
89bc500e | 183 | chan->state = state; |
80b98027 | 184 | chan->ops->state_change(chan, state); |
89bc500e GP |
185 | } |
186 | ||
0e587be7 AE |
187 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
188 | { | |
189 | struct sock *sk = chan->sk; | |
190 | ||
191 | lock_sock(sk); | |
192 | __l2cap_state_change(chan, state); | |
193 | release_sock(sk); | |
194 | } | |
195 | ||
2e0052e4 AE |
196 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
197 | { | |
198 | struct sock *sk = chan->sk; | |
199 | ||
200 | sk->sk_err = err; | |
201 | } | |
202 | ||
203 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
204 | { | |
205 | struct sock *sk = chan->sk; | |
206 | ||
207 | lock_sock(sk); | |
208 | __l2cap_chan_set_err(chan, err); | |
209 | release_sock(sk); | |
210 | } | |
211 | ||
4239d16f MM |
212 | static void __set_retrans_timer(struct l2cap_chan *chan) |
213 | { | |
214 | if (!delayed_work_pending(&chan->monitor_timer) && | |
215 | chan->retrans_timeout) { | |
216 | l2cap_set_timer(chan, &chan->retrans_timer, | |
217 | msecs_to_jiffies(chan->retrans_timeout)); | |
218 | } | |
219 | } | |
220 | ||
221 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
222 | { | |
223 | __clear_retrans_timer(chan); | |
224 | if (chan->monitor_timeout) { | |
225 | l2cap_set_timer(chan, &chan->monitor_timer, | |
226 | msecs_to_jiffies(chan->monitor_timeout)); | |
227 | } | |
228 | } | |
229 | ||
608bcc6d MM |
230 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
231 | u16 seq) | |
232 | { | |
233 | struct sk_buff *skb; | |
234 | ||
235 | skb_queue_walk(head, skb) { | |
236 | if (bt_cb(skb)->control.txseq == seq) | |
237 | return skb; | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
3c588192 MM |
243 | /* ---- L2CAP sequence number lists ---- */ |
244 | ||
245 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
246 | * SREJ requests that are received and for frames that are to be | |
247 | * retransmitted. These seq_list functions implement a singly-linked | |
248 | * list in an array, where membership in the list can also be checked | |
249 | * in constant time. Items can also be added to the tail of the list | |
250 | * and removed from the head in constant time, without further memory | |
251 | * allocs or frees. | |
252 | */ | |
253 | ||
254 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
255 | { | |
256 | size_t alloc_size, i; | |
257 | ||
258 | /* Allocated size is a power of 2 to map sequence numbers | |
259 | * (which may be up to 14 bits) in to a smaller array that is | |
260 | * sized for the negotiated ERTM transmit windows. | |
261 | */ | |
262 | alloc_size = roundup_pow_of_two(size); | |
263 | ||
264 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
265 | if (!seq_list->list) | |
266 | return -ENOMEM; | |
267 | ||
268 | seq_list->mask = alloc_size - 1; | |
269 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
270 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
271 | for (i = 0; i < alloc_size; i++) | |
272 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
278 | { | |
279 | kfree(seq_list->list); | |
280 | } | |
281 | ||
282 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
283 | u16 seq) | |
284 | { | |
285 | /* Constant-time check for list membership */ | |
286 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
287 | } | |
288 | ||
289 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
290 | { | |
291 | u16 mask = seq_list->mask; | |
292 | ||
293 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
294 | /* In case someone tries to pop the head of an empty list */ | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } else if (seq_list->head == seq) { | |
297 | /* Head can be removed in constant time */ | |
298 | seq_list->head = seq_list->list[seq & mask]; | |
299 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
300 | ||
301 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
302 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
303 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
304 | } | |
305 | } else { | |
306 | /* Walk the list to find the sequence number */ | |
307 | u16 prev = seq_list->head; | |
308 | while (seq_list->list[prev & mask] != seq) { | |
309 | prev = seq_list->list[prev & mask]; | |
310 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
311 | return L2CAP_SEQ_LIST_CLEAR; | |
312 | } | |
313 | ||
314 | /* Unlink the number from the list and clear it */ | |
315 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
316 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
317 | if (seq_list->tail == seq) | |
318 | seq_list->tail = prev; | |
319 | } | |
320 | return seq; | |
321 | } | |
322 | ||
323 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | /* Remove the head in constant time */ | |
326 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
327 | } | |
328 | ||
329 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
330 | { | |
f522ae36 | 331 | u16 i; |
3c588192 | 332 | |
f522ae36 GP |
333 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
335 | ||
336 | for (i = 0; i <= seq_list->mask; i++) | |
337 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
338 | ||
339 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
340 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
341 | } |
342 | ||
343 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
344 | { | |
345 | u16 mask = seq_list->mask; | |
346 | ||
347 | /* All appends happen in constant time */ | |
348 | ||
f522ae36 GP |
349 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
350 | return; | |
3c588192 | 351 | |
f522ae36 GP |
352 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
353 | seq_list->head = seq; | |
354 | else | |
355 | seq_list->list[seq_list->tail & mask] = seq; | |
356 | ||
357 | seq_list->tail = seq; | |
358 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
359 | } |
360 | ||
721c4181 | 361 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 362 | { |
721c4181 GP |
363 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
364 | chan_timer.work); | |
3df91ea2 | 365 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
366 | int reason; |
367 | ||
e05dcc32 | 368 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 369 | |
3df91ea2 | 370 | mutex_lock(&conn->chan_lock); |
6be36555 | 371 | l2cap_chan_lock(chan); |
ab07801d | 372 | |
89bc500e | 373 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 374 | reason = ECONNREFUSED; |
89bc500e | 375 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
376 | chan->sec_level != BT_SECURITY_SDP) |
377 | reason = ECONNREFUSED; | |
378 | else | |
379 | reason = ETIMEDOUT; | |
380 | ||
0f852724 | 381 | l2cap_chan_close(chan, reason); |
ab07801d | 382 | |
6be36555 | 383 | l2cap_chan_unlock(chan); |
ab07801d | 384 | |
80b98027 | 385 | chan->ops->close(chan); |
3df91ea2 AE |
386 | mutex_unlock(&conn->chan_lock); |
387 | ||
371fd835 | 388 | l2cap_chan_put(chan); |
ab07801d GP |
389 | } |
390 | ||
eef1d9b6 | 391 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
392 | { |
393 | struct l2cap_chan *chan; | |
394 | ||
395 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
396 | if (!chan) | |
397 | return NULL; | |
398 | ||
c03b355e AE |
399 | mutex_init(&chan->lock); |
400 | ||
333055f2 | 401 | write_lock(&chan_list_lock); |
23691d75 | 402 | list_add(&chan->global_l, &chan_list); |
333055f2 | 403 | write_unlock(&chan_list_lock); |
23691d75 | 404 | |
721c4181 | 405 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 406 | |
89bc500e GP |
407 | chan->state = BT_OPEN; |
408 | ||
71ba0e56 GP |
409 | atomic_set(&chan->refcnt, 1); |
410 | ||
2827011f MM |
411 | /* This flag is cleared in l2cap_chan_ready() */ |
412 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
413 | ||
eef1d9b6 | 414 | BT_DBG("chan %p", chan); |
abc545b8 | 415 | |
48454079 GP |
416 | return chan; |
417 | } | |
418 | ||
23691d75 | 419 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 420 | { |
333055f2 | 421 | write_lock(&chan_list_lock); |
23691d75 | 422 | list_del(&chan->global_l); |
333055f2 | 423 | write_unlock(&chan_list_lock); |
23691d75 | 424 | |
371fd835 | 425 | l2cap_chan_put(chan); |
6ff5abbf GP |
426 | } |
427 | ||
bd4b1653 AE |
428 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
429 | { | |
430 | chan->fcs = L2CAP_FCS_CRC16; | |
431 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
432 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 434 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
435 | chan->sec_level = BT_SECURITY_LOW; |
436 | ||
437 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
438 | } | |
439 | ||
14a28491 | 440 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 441 | { |
af05b30b | 442 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 443 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 444 | |
9f5a0d7b | 445 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 446 | |
8c1d787b | 447 | chan->conn = conn; |
0139418c | 448 | |
5491120e AE |
449 | switch (chan->chan_type) { |
450 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
451 | if (conn->hcon->type == LE_LINK) { |
452 | /* LE connection */ | |
6fcb06a2 | 453 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
454 | chan->scid = L2CAP_CID_LE_DATA; |
455 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
456 | } else { |
457 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 458 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 459 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 460 | } |
5491120e AE |
461 | break; |
462 | ||
463 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 464 | /* Connectionless socket */ |
fe4128e0 GP |
465 | chan->scid = L2CAP_CID_CONN_LESS; |
466 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 467 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
468 | break; |
469 | ||
416fa752 AE |
470 | case L2CAP_CHAN_CONN_FIX_A2MP: |
471 | chan->scid = L2CAP_CID_A2MP; | |
472 | chan->dcid = L2CAP_CID_A2MP; | |
473 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
474 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
475 | break; | |
476 | ||
5491120e | 477 | default: |
0139418c | 478 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
479 | chan->scid = L2CAP_CID_SIGNALING; |
480 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 481 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
482 | } |
483 | ||
8f7975b1 AE |
484 | chan->local_id = L2CAP_BESTEFFORT_ID; |
485 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
486 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
487 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
488 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
489 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
490 | ||
371fd835 | 491 | l2cap_chan_hold(chan); |
baa7e1fa | 492 | |
3df91ea2 | 493 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
494 | } |
495 | ||
466f8004 | 496 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
497 | { |
498 | mutex_lock(&conn->chan_lock); | |
499 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 500 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
501 | } |
502 | ||
466f8004 | 503 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 504 | { |
8c1d787b | 505 | struct l2cap_conn *conn = chan->conn; |
0139418c | 506 | |
c9b66675 | 507 | __clear_chan_timer(chan); |
0139418c | 508 | |
49208c9c | 509 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 510 | |
8e87d142 | 511 | if (conn) { |
baa7e1fa | 512 | /* Delete from channel list */ |
3df91ea2 | 513 | list_del(&chan->list); |
3d57dc68 | 514 | |
371fd835 | 515 | l2cap_chan_put(chan); |
baa7e1fa | 516 | |
8c1d787b | 517 | chan->conn = NULL; |
3cabbfda AE |
518 | |
519 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
520 | hci_conn_put(conn->hcon); | |
0139418c MH |
521 | } |
522 | ||
c0df7f6e AE |
523 | if (chan->ops->teardown) |
524 | chan->ops->teardown(chan, err); | |
6be36555 | 525 | |
2827011f | 526 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 527 | return; |
2ead70b8 | 528 | |
ee556f66 GP |
529 | switch(chan->mode) { |
530 | case L2CAP_MODE_BASIC: | |
531 | break; | |
c13ffa62 | 532 | |
ee556f66 | 533 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
534 | __clear_retrans_timer(chan); |
535 | __clear_monitor_timer(chan); | |
536 | __clear_ack_timer(chan); | |
c13ffa62 | 537 | |
f1c6775b | 538 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 539 | |
3c588192 MM |
540 | l2cap_seq_list_free(&chan->srej_list); |
541 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
542 | |
543 | /* fall through */ | |
544 | ||
545 | case L2CAP_MODE_STREAMING: | |
546 | skb_queue_purge(&chan->tx_q); | |
547 | break; | |
c13ffa62 | 548 | } |
ee556f66 GP |
549 | |
550 | return; | |
0139418c MH |
551 | } |
552 | ||
0f852724 | 553 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
554 | { |
555 | struct l2cap_conn *conn = chan->conn; | |
556 | struct sock *sk = chan->sk; | |
557 | ||
e05dcc32 AE |
558 | BT_DBG("chan %p state %s sk %p", chan, |
559 | state_to_string(chan->state), sk); | |
4519de9a | 560 | |
89bc500e | 561 | switch (chan->state) { |
4519de9a | 562 | case BT_LISTEN: |
c0df7f6e AE |
563 | if (chan->ops->teardown) |
564 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
565 | break; |
566 | ||
567 | case BT_CONNECTED: | |
568 | case BT_CONFIG: | |
715ec005 | 569 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 570 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 571 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
572 | l2cap_send_disconn_req(conn, chan, reason); |
573 | } else | |
574 | l2cap_chan_del(chan, reason); | |
575 | break; | |
576 | ||
577 | case BT_CONNECT2: | |
715ec005 | 578 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
579 | conn->hcon->type == ACL_LINK) { |
580 | struct l2cap_conn_rsp rsp; | |
581 | __u16 result; | |
582 | ||
c5daa683 | 583 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
584 | result = L2CAP_CR_SEC_BLOCK; |
585 | else | |
586 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 587 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
588 | |
589 | rsp.scid = cpu_to_le16(chan->dcid); | |
590 | rsp.dcid = cpu_to_le16(chan->scid); | |
591 | rsp.result = cpu_to_le16(result); | |
ac73498c | 592 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
593 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
594 | sizeof(rsp), &rsp); | |
595 | } | |
596 | ||
597 | l2cap_chan_del(chan, reason); | |
598 | break; | |
599 | ||
600 | case BT_CONNECT: | |
601 | case BT_DISCONN: | |
602 | l2cap_chan_del(chan, reason); | |
603 | break; | |
604 | ||
605 | default: | |
c0df7f6e AE |
606 | if (chan->ops->teardown) |
607 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
608 | break; |
609 | } | |
610 | } | |
611 | ||
4343478f | 612 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 613 | { |
715ec005 | 614 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 615 | switch (chan->sec_level) { |
8556edd3 JH |
616 | case BT_SECURITY_HIGH: |
617 | return HCI_AT_DEDICATED_BONDING_MITM; | |
618 | case BT_SECURITY_MEDIUM: | |
619 | return HCI_AT_DEDICATED_BONDING; | |
620 | default: | |
621 | return HCI_AT_NO_BONDING; | |
622 | } | |
2983fd68 | 623 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
624 | if (chan->sec_level == BT_SECURITY_LOW) |
625 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 626 | |
4343478f | 627 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 628 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 629 | else |
8556edd3 | 630 | return HCI_AT_NO_BONDING; |
00ae4af9 | 631 | } else { |
4343478f | 632 | switch (chan->sec_level) { |
00ae4af9 | 633 | case BT_SECURITY_HIGH: |
8556edd3 | 634 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 635 | case BT_SECURITY_MEDIUM: |
8556edd3 | 636 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 637 | default: |
8556edd3 | 638 | return HCI_AT_NO_BONDING; |
00ae4af9 | 639 | } |
0684e5f9 | 640 | } |
8556edd3 JH |
641 | } |
642 | ||
643 | /* Service level security */ | |
d45fc423 | 644 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 645 | { |
8c1d787b | 646 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
647 | __u8 auth_type; |
648 | ||
4343478f | 649 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 650 | |
4343478f | 651 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
652 | } |
653 | ||
b5ad8b7f | 654 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
655 | { |
656 | u8 id; | |
657 | ||
658 | /* Get next available identificator. | |
659 | * 1 - 128 are used by kernel. | |
660 | * 129 - 199 are reserved. | |
661 | * 200 - 254 are used by utilities like l2ping, etc. | |
662 | */ | |
663 | ||
333055f2 | 664 | spin_lock(&conn->lock); |
4e8402a3 MH |
665 | |
666 | if (++conn->tx_ident > 128) | |
667 | conn->tx_ident = 1; | |
668 | ||
669 | id = conn->tx_ident; | |
670 | ||
333055f2 | 671 | spin_unlock(&conn->lock); |
4e8402a3 MH |
672 | |
673 | return id; | |
674 | } | |
675 | ||
4519de9a | 676 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
677 | { |
678 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 679 | u8 flags; |
4e8402a3 MH |
680 | |
681 | BT_DBG("code 0x%2.2x", code); | |
682 | ||
683 | if (!skb) | |
9a9c6a34 | 684 | return; |
4e8402a3 | 685 | |
e702112f AE |
686 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
687 | flags = ACL_START_NO_FLUSH; | |
688 | else | |
689 | flags = ACL_START; | |
690 | ||
14b12d0b | 691 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 692 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 693 | |
73d80deb LAD |
694 | hci_send_acl(conn->hchan, skb, flags); |
695 | } | |
696 | ||
697 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
698 | { | |
699 | struct hci_conn *hcon = chan->conn->hcon; | |
700 | u16 flags; | |
701 | ||
702 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
703 | skb->priority); | |
704 | ||
705 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
706 | lmp_no_flush_capable(hcon->hdev)) | |
707 | flags = ACL_START_NO_FLUSH; | |
708 | else | |
709 | flags = ACL_START; | |
14b12d0b | 710 | |
73d80deb LAD |
711 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
712 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
713 | } |
714 | ||
b76bbd66 MM |
715 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
716 | { | |
717 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
718 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
719 | ||
720 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
721 | /* S-Frame */ | |
722 | control->sframe = 1; | |
723 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
724 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
725 | ||
726 | control->sar = 0; | |
727 | control->txseq = 0; | |
728 | } else { | |
729 | /* I-Frame */ | |
730 | control->sframe = 0; | |
731 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
732 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
733 | ||
734 | control->poll = 0; | |
735 | control->super = 0; | |
736 | } | |
737 | } | |
738 | ||
b76bbd66 MM |
739 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
740 | { | |
741 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
742 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
743 | ||
744 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
745 | /* S-Frame */ | |
746 | control->sframe = 1; | |
747 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
748 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
749 | ||
750 | control->sar = 0; | |
751 | control->txseq = 0; | |
752 | } else { | |
753 | /* I-Frame */ | |
754 | control->sframe = 0; | |
755 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
756 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
757 | ||
758 | control->poll = 0; | |
759 | control->super = 0; | |
760 | } | |
761 | } | |
762 | ||
763 | static inline void __unpack_control(struct l2cap_chan *chan, | |
764 | struct sk_buff *skb) | |
765 | { | |
766 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
767 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
768 | &bt_cb(skb)->control); | |
cec8ab6e | 769 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
770 | } else { |
771 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
772 | &bt_cb(skb)->control); | |
cec8ab6e | 773 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
774 | } |
775 | } | |
776 | ||
b5c6aaed MM |
777 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
778 | { | |
779 | u32 packed; | |
780 | ||
781 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
782 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
783 | ||
784 | if (control->sframe) { | |
785 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
786 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
787 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
788 | } else { | |
789 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
790 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
791 | } | |
792 | ||
793 | return packed; | |
794 | } | |
795 | ||
796 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
797 | { | |
798 | u16 packed; | |
799 | ||
800 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
801 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
802 | ||
803 | if (control->sframe) { | |
804 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
805 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
806 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
807 | } else { | |
808 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
809 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
810 | } | |
811 | ||
812 | return packed; | |
813 | } | |
814 | ||
b76bbd66 MM |
815 | static inline void __pack_control(struct l2cap_chan *chan, |
816 | struct l2cap_ctrl *control, | |
817 | struct sk_buff *skb) | |
818 | { | |
819 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
820 | put_unaligned_le32(__pack_extended_control(control), | |
821 | skb->data + L2CAP_HDR_SIZE); | |
822 | } else { | |
823 | put_unaligned_le16(__pack_enhanced_control(control), | |
824 | skb->data + L2CAP_HDR_SIZE); | |
825 | } | |
826 | } | |
827 | ||
ba7aa64f GP |
828 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
829 | { | |
830 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
831 | return L2CAP_EXT_HDR_SIZE; | |
832 | else | |
833 | return L2CAP_ENH_HDR_SIZE; | |
834 | } | |
835 | ||
a67d7f6f MM |
836 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
837 | u32 control) | |
b5c6aaed MM |
838 | { |
839 | struct sk_buff *skb; | |
840 | struct l2cap_hdr *lh; | |
ba7aa64f | 841 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
842 | |
843 | if (chan->fcs == L2CAP_FCS_CRC16) | |
844 | hlen += L2CAP_FCS_SIZE; | |
845 | ||
a67d7f6f | 846 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 847 | |
b5c6aaed | 848 | if (!skb) |
a67d7f6f | 849 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
850 | |
851 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
852 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
853 | lh->cid = cpu_to_le16(chan->dcid); | |
854 | ||
a67d7f6f MM |
855 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
856 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
857 | else | |
858 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
859 | |
860 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 861 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
862 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
863 | } | |
864 | ||
865 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
866 | return skb; |
867 | } | |
868 | ||
869 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
870 | struct l2cap_ctrl *control) | |
871 | { | |
872 | struct sk_buff *skb; | |
873 | u32 control_field; | |
874 | ||
875 | BT_DBG("chan %p, control %p", chan, control); | |
876 | ||
877 | if (!control->sframe) | |
878 | return; | |
879 | ||
880 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
881 | !control->poll) | |
882 | control->final = 1; | |
883 | ||
884 | if (control->super == L2CAP_SUPER_RR) | |
885 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
886 | else if (control->super == L2CAP_SUPER_RNR) | |
887 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
888 | ||
889 | if (control->super != L2CAP_SUPER_SREJ) { | |
890 | chan->last_acked_seq = control->reqseq; | |
891 | __clear_ack_timer(chan); | |
892 | } | |
893 | ||
894 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
895 | control->final, control->poll, control->super); | |
896 | ||
897 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
898 | control_field = __pack_extended_control(control); | |
899 | else | |
900 | control_field = __pack_enhanced_control(control); | |
901 | ||
902 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
903 | if (!IS_ERR(skb)) | |
904 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
905 | } |
906 | ||
c9e3d5e0 | 907 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 908 | { |
c9e3d5e0 MM |
909 | struct l2cap_ctrl control; |
910 | ||
911 | BT_DBG("chan %p, poll %d", chan, poll); | |
912 | ||
913 | memset(&control, 0, sizeof(control)); | |
914 | control.sframe = 1; | |
915 | control.poll = poll; | |
916 | ||
917 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
918 | control.super = L2CAP_SUPER_RNR; | |
919 | else | |
920 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 921 | |
c9e3d5e0 MM |
922 | control.reqseq = chan->buffer_seq; |
923 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
924 | } |
925 | ||
b4450035 | 926 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 927 | { |
c1360a1c | 928 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
929 | } |
930 | ||
9b27f350 AE |
931 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
932 | { | |
933 | struct l2cap_conn *conn = chan->conn; | |
934 | struct l2cap_conn_req req; | |
935 | ||
936 | req.scid = cpu_to_le16(chan->scid); | |
937 | req.psm = chan->psm; | |
938 | ||
939 | chan->ident = l2cap_get_ident(conn); | |
940 | ||
941 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
942 | ||
943 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
944 | } | |
945 | ||
9f0caeb1 VCG |
946 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
947 | { | |
2827011f | 948 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
949 | chan->conf_state = 0; |
950 | __clear_chan_timer(chan); | |
951 | ||
54a59aa2 | 952 | chan->state = BT_CONNECTED; |
9f0caeb1 | 953 | |
fd83e2c2 | 954 | chan->ops->ready(chan); |
9f0caeb1 VCG |
955 | } |
956 | ||
fc7f8a7e | 957 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 958 | { |
8c1d787b | 959 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 960 | |
9f0caeb1 VCG |
961 | if (conn->hcon->type == LE_LINK) { |
962 | l2cap_chan_ready(chan); | |
963 | return; | |
964 | } | |
965 | ||
79d554a6 | 966 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
967 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
968 | return; | |
969 | ||
d45fc423 | 970 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
971 | __l2cap_no_conn_pending(chan)) |
972 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
973 | } else { |
974 | struct l2cap_info_req req; | |
ac73498c | 975 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
976 | |
977 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
978 | conn->info_ident = l2cap_get_ident(conn); | |
979 | ||
ba13ccd9 | 980 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
981 | |
982 | l2cap_send_cmd(conn, conn->info_ident, | |
983 | L2CAP_INFO_REQ, sizeof(req), &req); | |
984 | } | |
985 | } | |
986 | ||
cf6c2c0b GP |
987 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
988 | { | |
989 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 990 | if (!disable_ertm) |
cf6c2c0b GP |
991 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
992 | ||
993 | switch (mode) { | |
994 | case L2CAP_MODE_ERTM: | |
995 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
996 | case L2CAP_MODE_STREAMING: | |
997 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
998 | default: | |
999 | return 0x00; | |
1000 | } | |
1001 | } | |
1002 | ||
4519de9a | 1003 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1004 | { |
6be36555 | 1005 | struct sock *sk = chan->sk; |
22121fc9 GP |
1006 | struct l2cap_disconn_req req; |
1007 | ||
c13ffa62 GP |
1008 | if (!conn) |
1009 | return; | |
1010 | ||
0c1bc5c6 | 1011 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1012 | __clear_retrans_timer(chan); |
1013 | __clear_monitor_timer(chan); | |
1014 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1015 | } |
1016 | ||
416fa752 AE |
1017 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1018 | __l2cap_state_change(chan, BT_DISCONN); | |
1019 | return; | |
1020 | } | |
1021 | ||
fe4128e0 GP |
1022 | req.dcid = cpu_to_le16(chan->dcid); |
1023 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1024 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1025 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1026 | |
6be36555 | 1027 | lock_sock(sk); |
0e587be7 | 1028 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1029 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1030 | release_sock(sk); |
22121fc9 GP |
1031 | } |
1032 | ||
1da177e4 | 1033 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1034 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1035 | { | |
3df91ea2 | 1036 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1037 | |
1038 | BT_DBG("conn %p", conn); | |
1039 | ||
3df91ea2 | 1040 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1041 | |
3df91ea2 | 1042 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1043 | struct sock *sk = chan->sk; |
baa7e1fa | 1044 | |
6be36555 | 1045 | l2cap_chan_lock(chan); |
4e8402a3 | 1046 | |
715ec005 | 1047 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1048 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1049 | continue; |
1050 | } | |
1051 | ||
89bc500e | 1052 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1053 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1054 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1055 | l2cap_chan_unlock(chan); |
47731de7 GP |
1056 | continue; |
1057 | } | |
79d554a6 | 1058 | |
c1360a1c GP |
1059 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1060 | && test_bit(CONF_STATE2_DEVICE, | |
1061 | &chan->conf_state)) { | |
89bc500e | 1062 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1063 | l2cap_chan_unlock(chan); |
47731de7 | 1064 | continue; |
b1235d79 | 1065 | } |
47731de7 | 1066 | |
9b27f350 | 1067 | l2cap_send_conn_req(chan); |
47731de7 | 1068 | |
89bc500e | 1069 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1070 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1071 | char buf[128]; |
fe4128e0 GP |
1072 | rsp.scid = cpu_to_le16(chan->dcid); |
1073 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1074 | |
d45fc423 | 1075 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1076 | lock_sock(sk); |
c5daa683 GP |
1077 | if (test_bit(BT_SK_DEFER_SETUP, |
1078 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1079 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1080 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1081 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1082 | if (parent) |
1083 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1084 | |
1085 | } else { | |
0e587be7 | 1086 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1087 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1088 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1089 | } |
6be36555 | 1090 | release_sock(sk); |
79d554a6 | 1091 | } else { |
ac73498c AE |
1092 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1093 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1094 | } |
1095 | ||
fc7f8a7e GP |
1096 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1097 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1098 | |
c1360a1c | 1099 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1100 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1101 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1102 | continue; |
1103 | } | |
1104 | ||
c1360a1c | 1105 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1106 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1107 | l2cap_build_conf_req(chan, buf), buf); |
1108 | chan->num_conf_req++; | |
4e8402a3 MH |
1109 | } |
1110 | ||
6be36555 | 1111 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1112 | } |
1113 | ||
3df91ea2 | 1114 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1115 | } |
1116 | ||
c2287681 | 1117 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1118 | * Returns closest match, locked. |
1119 | */ | |
d9b88702 | 1120 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1121 | bdaddr_t *src, |
1122 | bdaddr_t *dst) | |
b62f328b | 1123 | { |
23691d75 | 1124 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1125 | |
23691d75 | 1126 | read_lock(&chan_list_lock); |
b62f328b | 1127 | |
23691d75 GP |
1128 | list_for_each_entry(c, &chan_list, global_l) { |
1129 | struct sock *sk = c->sk; | |
fe4128e0 | 1130 | |
89bc500e | 1131 | if (state && c->state != state) |
b62f328b VT |
1132 | continue; |
1133 | ||
23691d75 | 1134 | if (c->scid == cid) { |
c2287681 IY |
1135 | int src_match, dst_match; |
1136 | int src_any, dst_any; | |
1137 | ||
b62f328b | 1138 | /* Exact match. */ |
c2287681 IY |
1139 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1140 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1141 | if (src_match && dst_match) { | |
23691d75 GP |
1142 | read_unlock(&chan_list_lock); |
1143 | return c; | |
1144 | } | |
b62f328b VT |
1145 | |
1146 | /* Closest match */ | |
c2287681 IY |
1147 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1148 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1149 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1150 | (src_any && dst_any)) | |
23691d75 | 1151 | c1 = c; |
b62f328b VT |
1152 | } |
1153 | } | |
280f294f | 1154 | |
23691d75 | 1155 | read_unlock(&chan_list_lock); |
b62f328b | 1156 | |
23691d75 | 1157 | return c1; |
b62f328b VT |
1158 | } |
1159 | ||
1160 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1161 | { | |
c916fbe4 | 1162 | struct sock *parent, *sk; |
23691d75 | 1163 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1164 | |
1165 | BT_DBG(""); | |
1166 | ||
1167 | /* Check if we have socket listening on cid */ | |
23691d75 | 1168 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1169 | conn->src, conn->dst); |
23691d75 | 1170 | if (!pchan) |
b62f328b VT |
1171 | return; |
1172 | ||
23691d75 GP |
1173 | parent = pchan->sk; |
1174 | ||
aa2ac881 | 1175 | lock_sock(parent); |
62f3a2cf | 1176 | |
80b98027 | 1177 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1178 | if (!chan) |
b62f328b VT |
1179 | goto clean; |
1180 | ||
80808e43 | 1181 | sk = chan->sk; |
5d41ce1d | 1182 | |
b62f328b VT |
1183 | hci_conn_hold(conn->hcon); |
1184 | ||
b62f328b VT |
1185 | bacpy(&bt_sk(sk)->src, conn->src); |
1186 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1187 | ||
d1010240 GP |
1188 | bt_accept_enqueue(parent, sk); |
1189 | ||
3d57dc68 | 1190 | l2cap_chan_add(conn, chan); |
48454079 | 1191 | |
6754e0df | 1192 | l2cap_chan_ready(chan); |
b62f328b | 1193 | |
b62f328b | 1194 | clean: |
aa2ac881 | 1195 | release_sock(parent); |
b62f328b VT |
1196 | } |
1197 | ||
4e8402a3 MH |
1198 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1199 | { | |
48454079 | 1200 | struct l2cap_chan *chan; |
4e8402a3 | 1201 | |
79d554a6 | 1202 | BT_DBG("conn %p", conn); |
4e8402a3 | 1203 | |
b62f328b VT |
1204 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1205 | l2cap_le_conn_ready(conn); | |
1206 | ||
160dc6ac VCG |
1207 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1208 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1209 | ||
3df91ea2 | 1210 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1211 | |
3df91ea2 | 1212 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1213 | |
6be36555 | 1214 | l2cap_chan_lock(chan); |
4e8402a3 | 1215 | |
416fa752 AE |
1216 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1217 | l2cap_chan_unlock(chan); | |
1218 | continue; | |
1219 | } | |
1220 | ||
63128451 | 1221 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1222 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1223 | l2cap_chan_ready(chan); |
acd7d370 | 1224 | |
63128451 | 1225 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1226 | struct sock *sk = chan->sk; |
c9b66675 | 1227 | __clear_chan_timer(chan); |
6be36555 | 1228 | lock_sock(sk); |
0e587be7 | 1229 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1230 | sk->sk_state_change(sk); |
6be36555 | 1231 | release_sock(sk); |
b501d6a1 | 1232 | |
89bc500e | 1233 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1234 | l2cap_do_start(chan); |
4e8402a3 | 1235 | |
6be36555 | 1236 | l2cap_chan_unlock(chan); |
4e8402a3 | 1237 | } |
79d554a6 | 1238 | |
3df91ea2 | 1239 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1240 | } |
1241 | ||
1242 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1243 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1244 | { | |
48454079 | 1245 | struct l2cap_chan *chan; |
4e8402a3 MH |
1246 | |
1247 | BT_DBG("conn %p", conn); | |
1248 | ||
3df91ea2 | 1249 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1250 | |
3df91ea2 | 1251 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1252 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1253 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1254 | } |
1255 | ||
3df91ea2 | 1256 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1257 | } |
1258 | ||
f878fcad | 1259 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1260 | { |
f878fcad | 1261 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1262 | info_timer.work); |
4e8402a3 | 1263 | |
984947dc | 1264 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1265 | conn->info_ident = 0; |
984947dc | 1266 | |
4e8402a3 MH |
1267 | l2cap_conn_start(conn); |
1268 | } | |
1269 | ||
5d3de7df VCG |
1270 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1271 | { | |
1272 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1273 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1274 | |
1275 | if (!conn) | |
1276 | return; | |
1277 | ||
1278 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1279 | ||
1280 | kfree_skb(conn->rx_skb); | |
1281 | ||
3df91ea2 AE |
1282 | mutex_lock(&conn->chan_lock); |
1283 | ||
5d3de7df VCG |
1284 | /* Kill channels */ |
1285 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1286 | l2cap_chan_hold(chan); |
6be36555 AE |
1287 | l2cap_chan_lock(chan); |
1288 | ||
5d3de7df | 1289 | l2cap_chan_del(chan, err); |
6be36555 AE |
1290 | |
1291 | l2cap_chan_unlock(chan); | |
1292 | ||
80b98027 | 1293 | chan->ops->close(chan); |
61d6ef3e | 1294 | l2cap_chan_put(chan); |
5d3de7df VCG |
1295 | } |
1296 | ||
3df91ea2 AE |
1297 | mutex_unlock(&conn->chan_lock); |
1298 | ||
73d80deb LAD |
1299 | hci_chan_del(conn->hchan); |
1300 | ||
5d3de7df | 1301 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1302 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1303 | |
51a8efd7 | 1304 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1305 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1306 | smp_chan_destroy(conn); |
d26a2345 | 1307 | } |
5d3de7df VCG |
1308 | |
1309 | hcon->l2cap_data = NULL; | |
1310 | kfree(conn); | |
1311 | } | |
1312 | ||
6c9d42a1 | 1313 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1314 | { |
6c9d42a1 GP |
1315 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1316 | security_timer.work); | |
5d3de7df | 1317 | |
d06cc416 JH |
1318 | BT_DBG("conn %p", conn); |
1319 | ||
1320 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1321 | smp_chan_destroy(conn); | |
1322 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1323 | } | |
5d3de7df VCG |
1324 | } |
1325 | ||
1da177e4 LT |
1326 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1327 | { | |
0139418c | 1328 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1329 | struct hci_chan *hchan; |
1da177e4 | 1330 | |
0139418c | 1331 | if (conn || status) |
1da177e4 LT |
1332 | return conn; |
1333 | ||
73d80deb LAD |
1334 | hchan = hci_chan_create(hcon); |
1335 | if (!hchan) | |
1336 | return NULL; | |
1337 | ||
0139418c | 1338 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1339 | if (!conn) { |
1340 | hci_chan_del(hchan); | |
1da177e4 | 1341 | return NULL; |
73d80deb | 1342 | } |
1da177e4 LT |
1343 | |
1344 | hcon->l2cap_data = conn; | |
1345 | conn->hcon = hcon; | |
73d80deb | 1346 | conn->hchan = hchan; |
1da177e4 | 1347 | |
73d80deb | 1348 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1349 | |
acd7d370 VT |
1350 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1351 | conn->mtu = hcon->hdev->le_mtu; | |
1352 | else | |
1353 | conn->mtu = hcon->hdev->acl_mtu; | |
1354 | ||
1da177e4 LT |
1355 | conn->src = &hcon->hdev->bdaddr; |
1356 | conn->dst = &hcon->dst; | |
1357 | ||
4e8402a3 MH |
1358 | conn->feat_mask = 0; |
1359 | ||
1da177e4 | 1360 | spin_lock_init(&conn->lock); |
3df91ea2 | 1361 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1362 | |
1363 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1364 | |
5d3de7df | 1365 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1366 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1367 | else |
030013d8 | 1368 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1369 | |
9f5a0d7b | 1370 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1371 | |
1da177e4 LT |
1372 | return conn; |
1373 | } | |
1374 | ||
1da177e4 | 1375 | /* ---- Socket interface ---- */ |
1da177e4 | 1376 | |
c2287681 | 1377 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1378 | * Returns closest match. |
1379 | */ | |
c2287681 IY |
1380 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1381 | bdaddr_t *src, | |
1382 | bdaddr_t *dst) | |
1da177e4 | 1383 | { |
23691d75 | 1384 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1385 | |
23691d75 | 1386 | read_lock(&chan_list_lock); |
e0f0cb56 | 1387 | |
23691d75 GP |
1388 | list_for_each_entry(c, &chan_list, global_l) { |
1389 | struct sock *sk = c->sk; | |
fe4128e0 | 1390 | |
89bc500e | 1391 | if (state && c->state != state) |
1da177e4 LT |
1392 | continue; |
1393 | ||
23691d75 | 1394 | if (c->psm == psm) { |
c2287681 IY |
1395 | int src_match, dst_match; |
1396 | int src_any, dst_any; | |
1397 | ||
1da177e4 | 1398 | /* Exact match. */ |
c2287681 IY |
1399 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1400 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1401 | if (src_match && dst_match) { | |
a7567b20 | 1402 | read_unlock(&chan_list_lock); |
23691d75 GP |
1403 | return c; |
1404 | } | |
1da177e4 LT |
1405 | |
1406 | /* Closest match */ | |
c2287681 IY |
1407 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1408 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1409 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1410 | (src_any && dst_any)) | |
23691d75 | 1411 | c1 = c; |
1da177e4 LT |
1412 | } |
1413 | } | |
1da177e4 | 1414 | |
23691d75 | 1415 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1416 | |
23691d75 | 1417 | return c1; |
1da177e4 LT |
1418 | } |
1419 | ||
8e9f9892 AG |
1420 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1421 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1422 | { |
5d41ce1d | 1423 | struct sock *sk = chan->sk; |
1da177e4 | 1424 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1425 | struct l2cap_conn *conn; |
1426 | struct hci_conn *hcon; | |
1427 | struct hci_dev *hdev; | |
09ab6f4c | 1428 | __u8 auth_type; |
44d0e48e | 1429 | int err; |
1da177e4 | 1430 | |
8e9f9892 AG |
1431 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1432 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1433 | |
af05b30b GP |
1434 | hdev = hci_get_route(dst, src); |
1435 | if (!hdev) | |
1da177e4 LT |
1436 | return -EHOSTUNREACH; |
1437 | ||
09fd0de5 | 1438 | hci_dev_lock(hdev); |
1da177e4 | 1439 | |
6be36555 | 1440 | l2cap_chan_lock(chan); |
03a00194 GP |
1441 | |
1442 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1443 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1444 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1445 | err = -EINVAL; | |
1446 | goto done; | |
1447 | } | |
1448 | ||
1449 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1450 | err = -EINVAL; | |
1451 | goto done; | |
1452 | } | |
1453 | ||
1454 | switch (chan->mode) { | |
1455 | case L2CAP_MODE_BASIC: | |
1456 | break; | |
1457 | case L2CAP_MODE_ERTM: | |
1458 | case L2CAP_MODE_STREAMING: | |
1459 | if (!disable_ertm) | |
1460 | break; | |
1461 | /* fall through */ | |
1462 | default: | |
1463 | err = -ENOTSUPP; | |
1464 | goto done; | |
1465 | } | |
1466 | ||
0797e01d | 1467 | switch (chan->state) { |
03a00194 GP |
1468 | case BT_CONNECT: |
1469 | case BT_CONNECT2: | |
1470 | case BT_CONFIG: | |
1471 | /* Already connecting */ | |
1472 | err = 0; | |
1473 | goto done; | |
1474 | ||
1475 | case BT_CONNECTED: | |
1476 | /* Already connected */ | |
1477 | err = -EISCONN; | |
1478 | goto done; | |
1479 | ||
1480 | case BT_OPEN: | |
1481 | case BT_BOUND: | |
1482 | /* Can connect */ | |
1483 | break; | |
1484 | ||
1485 | default: | |
1486 | err = -EBADFD; | |
1487 | goto done; | |
1488 | } | |
1489 | ||
1490 | /* Set destination address and psm */ | |
0797e01d | 1491 | lock_sock(sk); |
9219b2a0 | 1492 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1493 | release_sock(sk); |
1494 | ||
03a00194 GP |
1495 | chan->psm = psm; |
1496 | chan->dcid = cid; | |
1da177e4 | 1497 | |
4343478f | 1498 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1499 | |
fe4128e0 | 1500 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1501 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1502 | chan->sec_level, auth_type); |
acd7d370 | 1503 | else |
8e9f9892 | 1504 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1505 | chan->sec_level, auth_type); |
acd7d370 | 1506 | |
30e76272 VT |
1507 | if (IS_ERR(hcon)) { |
1508 | err = PTR_ERR(hcon); | |
1da177e4 | 1509 | goto done; |
30e76272 | 1510 | } |
1da177e4 LT |
1511 | |
1512 | conn = l2cap_conn_add(hcon, 0); | |
1513 | if (!conn) { | |
1514 | hci_conn_put(hcon); | |
30e76272 | 1515 | err = -ENOMEM; |
1da177e4 LT |
1516 | goto done; |
1517 | } | |
1518 | ||
9f0caeb1 VCG |
1519 | if (hcon->type == LE_LINK) { |
1520 | err = 0; | |
1521 | ||
1522 | if (!list_empty(&conn->chan_l)) { | |
1523 | err = -EBUSY; | |
1524 | hci_conn_put(hcon); | |
1525 | } | |
1526 | ||
1527 | if (err) | |
1528 | goto done; | |
1529 | } | |
1530 | ||
1da177e4 LT |
1531 | /* Update source addr of the socket */ |
1532 | bacpy(src, conn->src); | |
1533 | ||
6be36555 | 1534 | l2cap_chan_unlock(chan); |
48454079 | 1535 | l2cap_chan_add(conn, chan); |
6be36555 | 1536 | l2cap_chan_lock(chan); |
48454079 | 1537 | |
6be36555 | 1538 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1539 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1540 | |
1541 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1542 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1543 | __clear_chan_timer(chan); |
d45fc423 | 1544 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1545 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1546 | } else |
fc7f8a7e | 1547 | l2cap_do_start(chan); |
1da177e4 LT |
1548 | } |
1549 | ||
30e76272 VT |
1550 | err = 0; |
1551 | ||
1da177e4 | 1552 | done: |
6be36555 | 1553 | l2cap_chan_unlock(chan); |
09fd0de5 | 1554 | hci_dev_unlock(hdev); |
1da177e4 LT |
1555 | hci_dev_put(hdev); |
1556 | return err; | |
1557 | } | |
1558 | ||
dcba0dba | 1559 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1560 | { |
8c1d787b | 1561 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1562 | DECLARE_WAITQUEUE(wait, current); |
1563 | int err = 0; | |
1564 | int timeo = HZ/5; | |
1565 | ||
2b0b05dd | 1566 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1567 | set_current_state(TASK_INTERRUPTIBLE); |
1568 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1569 | if (!timeo) |
1570 | timeo = HZ/5; | |
1571 | ||
1572 | if (signal_pending(current)) { | |
1573 | err = sock_intr_errno(timeo); | |
1574 | break; | |
1575 | } | |
1576 | ||
1577 | release_sock(sk); | |
1578 | timeo = schedule_timeout(timeo); | |
1579 | lock_sock(sk); | |
a71a0cf4 | 1580 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1581 | |
1582 | err = sock_error(sk); | |
1583 | if (err) | |
1584 | break; | |
1585 | } | |
1586 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1587 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1588 | return err; |
1589 | } | |
1590 | ||
721c4181 | 1591 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1592 | { |
721c4181 | 1593 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1594 | monitor_timer.work); |
e90bac06 | 1595 | |
525cd185 | 1596 | BT_DBG("chan %p", chan); |
0e98958d | 1597 | |
6be36555 AE |
1598 | l2cap_chan_lock(chan); |
1599 | ||
80909e04 | 1600 | if (!chan->conn) { |
6be36555 | 1601 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1602 | l2cap_chan_put(chan); |
e90bac06 GP |
1603 | return; |
1604 | } | |
1605 | ||
401bb1f7 | 1606 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1607 | |
6be36555 | 1608 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1609 | l2cap_chan_put(chan); |
e90bac06 GP |
1610 | } |
1611 | ||
721c4181 | 1612 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1613 | { |
721c4181 | 1614 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1615 | retrans_timer.work); |
e90bac06 | 1616 | |
49208c9c | 1617 | BT_DBG("chan %p", chan); |
0e98958d | 1618 | |
6be36555 AE |
1619 | l2cap_chan_lock(chan); |
1620 | ||
80909e04 MM |
1621 | if (!chan->conn) { |
1622 | l2cap_chan_unlock(chan); | |
1623 | l2cap_chan_put(chan); | |
1624 | return; | |
1625 | } | |
6be36555 | 1626 | |
401bb1f7 | 1627 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1628 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1629 | l2cap_chan_put(chan); |
e90bac06 GP |
1630 | } |
1631 | ||
d660366d GP |
1632 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1633 | struct sk_buff_head *skbs) | |
6840ed07 | 1634 | { |
ccbb84af | 1635 | struct sk_buff *skb; |
3733937d | 1636 | struct l2cap_ctrl *control; |
6840ed07 | 1637 | |
3733937d MM |
1638 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1639 | ||
3733937d MM |
1640 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1641 | ||
1642 | while (!skb_queue_empty(&chan->tx_q)) { | |
1643 | ||
1644 | skb = skb_dequeue(&chan->tx_q); | |
1645 | ||
1646 | bt_cb(skb)->control.retries = 1; | |
1647 | control = &bt_cb(skb)->control; | |
1648 | ||
1649 | control->reqseq = 0; | |
1650 | control->txseq = chan->next_tx_seq; | |
1651 | ||
1652 | __pack_control(chan, control, skb); | |
6840ed07 | 1653 | |
47d1ec61 | 1654 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1655 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1656 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1657 | } |
1658 | ||
4343478f | 1659 | l2cap_do_send(chan, skb); |
6840ed07 | 1660 | |
b4400672 | 1661 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1662 | |
836be934 | 1663 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1664 | chan->frames_sent++; |
6840ed07 | 1665 | } |
6840ed07 GP |
1666 | } |
1667 | ||
67c9e840 | 1668 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1669 | { |
1670 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1671 | struct l2cap_ctrl *control; |
1672 | int sent = 0; | |
1673 | ||
1674 | BT_DBG("chan %p", chan); | |
1c2acffb | 1675 | |
89bc500e | 1676 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1677 | return -ENOTCONN; |
e90bac06 | 1678 | |
94122bbe MM |
1679 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1680 | return 0; | |
1681 | ||
18a48e76 MM |
1682 | while (chan->tx_send_head && |
1683 | chan->unacked_frames < chan->remote_tx_win && | |
1684 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1685 | |
18a48e76 | 1686 | skb = chan->tx_send_head; |
e90bac06 | 1687 | |
18a48e76 MM |
1688 | bt_cb(skb)->control.retries = 1; |
1689 | control = &bt_cb(skb)->control; | |
95ffa978 | 1690 | |
e2ab4353 | 1691 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1692 | control->final = 1; |
e2ab4353 | 1693 | |
18a48e76 MM |
1694 | control->reqseq = chan->buffer_seq; |
1695 | chan->last_acked_seq = chan->buffer_seq; | |
1696 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1697 | |
18a48e76 | 1698 | __pack_control(chan, control, skb); |
e90bac06 | 1699 | |
47d1ec61 | 1700 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1701 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1702 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1703 | } |
1704 | ||
18a48e76 MM |
1705 | /* Clone after data has been modified. Data is assumed to be |
1706 | read-only (for locking purposes) on cloned sk_buffs. | |
1707 | */ | |
1708 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1709 | |
18a48e76 MM |
1710 | if (!tx_skb) |
1711 | break; | |
1c2acffb | 1712 | |
18a48e76 | 1713 | __set_retrans_timer(chan); |
836be934 AE |
1714 | |
1715 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1716 | chan->unacked_frames++; |
6a026610 | 1717 | chan->frames_sent++; |
18a48e76 | 1718 | sent++; |
1c2acffb | 1719 | |
58d35f87 GP |
1720 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1721 | chan->tx_send_head = NULL; | |
1c2acffb | 1722 | else |
58d35f87 | 1723 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1724 | |
1725 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1726 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1727 | } |
1728 | ||
b4400672 AE |
1729 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1730 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1731 | |
1732 | return sent; | |
9e917af1 GP |
1733 | } |
1734 | ||
e1fbd4c1 MM |
1735 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1736 | { | |
1737 | struct l2cap_ctrl control; | |
1738 | struct sk_buff *skb; | |
1739 | struct sk_buff *tx_skb; | |
1740 | u16 seq; | |
1741 | ||
1742 | BT_DBG("chan %p", chan); | |
1743 | ||
1744 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1745 | return; | |
1746 | ||
1747 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1748 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1749 | ||
1750 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1751 | if (!skb) { | |
1752 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1753 | seq); | |
1754 | continue; | |
1755 | } | |
1756 | ||
1757 | bt_cb(skb)->control.retries++; | |
1758 | control = bt_cb(skb)->control; | |
1759 | ||
1760 | if (chan->max_tx != 0 && | |
1761 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1762 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1763 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1764 | l2cap_seq_list_clear(&chan->retrans_list); | |
1765 | break; | |
1766 | } | |
1767 | ||
1768 | control.reqseq = chan->buffer_seq; | |
1769 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1770 | control.final = 1; | |
1771 | else | |
1772 | control.final = 0; | |
1773 | ||
1774 | if (skb_cloned(skb)) { | |
1775 | /* Cloned sk_buffs are read-only, so we need a | |
1776 | * writeable copy | |
1777 | */ | |
1778 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1779 | } else { | |
1780 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1781 | } | |
1782 | ||
1783 | if (!tx_skb) { | |
1784 | l2cap_seq_list_clear(&chan->retrans_list); | |
1785 | break; | |
1786 | } | |
1787 | ||
1788 | /* Update skb contents */ | |
1789 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1790 | put_unaligned_le32(__pack_extended_control(&control), | |
1791 | tx_skb->data + L2CAP_HDR_SIZE); | |
1792 | } else { | |
1793 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1794 | tx_skb->data + L2CAP_HDR_SIZE); | |
1795 | } | |
1796 | ||
1797 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1798 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1799 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1800 | L2CAP_FCS_SIZE)); | |
1801 | } | |
1802 | ||
1803 | l2cap_do_send(chan, tx_skb); | |
1804 | ||
1805 | BT_DBG("Resent txseq %d", control.txseq); | |
1806 | ||
1807 | chan->last_acked_seq = chan->buffer_seq; | |
1808 | } | |
1809 | } | |
1810 | ||
f80842a8 MM |
1811 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1812 | struct l2cap_ctrl *control) | |
1813 | { | |
1814 | BT_DBG("chan %p, control %p", chan, control); | |
1815 | ||
1816 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1817 | l2cap_ertm_resend(chan); | |
1818 | } | |
1819 | ||
d2a7ac5d MM |
1820 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1821 | struct l2cap_ctrl *control) | |
1822 | { | |
e1fbd4c1 MM |
1823 | struct sk_buff *skb; |
1824 | ||
1825 | BT_DBG("chan %p, control %p", chan, control); | |
1826 | ||
1827 | if (control->poll) | |
1828 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1829 | ||
1830 | l2cap_seq_list_clear(&chan->retrans_list); | |
1831 | ||
1832 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1833 | return; | |
1834 | ||
1835 | if (chan->unacked_frames) { | |
1836 | skb_queue_walk(&chan->tx_q, skb) { | |
1837 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1838 | skb == chan->tx_send_head) | |
1839 | break; | |
1840 | } | |
1841 | ||
1842 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1843 | if (skb == chan->tx_send_head) | |
1844 | break; | |
1845 | ||
1846 | l2cap_seq_list_append(&chan->retrans_list, | |
1847 | bt_cb(skb)->control.txseq); | |
1848 | } | |
1849 | ||
1850 | l2cap_ertm_resend(chan); | |
1851 | } | |
d2a7ac5d MM |
1852 | } |
1853 | ||
0a0aba42 | 1854 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1855 | { |
0a0aba42 MM |
1856 | struct l2cap_ctrl control; |
1857 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1858 | chan->last_acked_seq); | |
1859 | int threshold; | |
9e917af1 | 1860 | |
0a0aba42 MM |
1861 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1862 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1863 | |
0a0aba42 MM |
1864 | memset(&control, 0, sizeof(control)); |
1865 | control.sframe = 1; | |
dfc909be | 1866 | |
0a0aba42 MM |
1867 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1868 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1869 | __clear_ack_timer(chan); | |
1870 | control.super = L2CAP_SUPER_RNR; | |
1871 | control.reqseq = chan->buffer_seq; | |
1872 | l2cap_send_sframe(chan, &control); | |
1873 | } else { | |
1874 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1875 | l2cap_ertm_send(chan); | |
1876 | /* If any i-frames were sent, they included an ack */ | |
1877 | if (chan->buffer_seq == chan->last_acked_seq) | |
1878 | frames_to_ack = 0; | |
1879 | } | |
dfc909be | 1880 | |
c20f8e35 | 1881 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
1882 | * Calculate without mul or div |
1883 | */ | |
c20f8e35 | 1884 | threshold = chan->ack_win; |
0a0aba42 MM |
1885 | threshold += threshold << 1; |
1886 | threshold >>= 2; | |
1887 | ||
b4400672 | 1888 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1889 | threshold); |
1890 | ||
1891 | if (frames_to_ack >= threshold) { | |
1892 | __clear_ack_timer(chan); | |
1893 | control.super = L2CAP_SUPER_RR; | |
1894 | control.reqseq = chan->buffer_seq; | |
1895 | l2cap_send_sframe(chan, &control); | |
1896 | frames_to_ack = 0; | |
1897 | } | |
1c2acffb | 1898 | |
0a0aba42 MM |
1899 | if (frames_to_ack) |
1900 | __set_ack_timer(chan); | |
1901 | } | |
b17e73bb SJ |
1902 | } |
1903 | ||
04124681 GP |
1904 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1905 | struct msghdr *msg, int len, | |
1906 | int count, struct sk_buff *skb) | |
1c2acffb | 1907 | { |
0952a57a | 1908 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1909 | struct sk_buff **frag; |
90338947 | 1910 | int sent = 0; |
1da177e4 | 1911 | |
59203a21 | 1912 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1913 | return -EFAULT; |
1da177e4 LT |
1914 | |
1915 | sent += count; | |
1916 | len -= count; | |
1917 | ||
1918 | /* Continuation fragments (no L2CAP header) */ | |
1919 | frag = &skb_shinfo(skb)->frag_list; | |
1920 | while (len) { | |
fbe00700 GP |
1921 | struct sk_buff *tmp; |
1922 | ||
1da177e4 LT |
1923 | count = min_t(unsigned int, conn->mtu, len); |
1924 | ||
fbe00700 GP |
1925 | tmp = chan->ops->alloc_skb(chan, count, |
1926 | msg->msg_flags & MSG_DONTWAIT); | |
1927 | if (IS_ERR(tmp)) | |
1928 | return PTR_ERR(tmp); | |
1929 | ||
1930 | *frag = tmp; | |
2f7719ce | 1931 | |
1c2acffb GP |
1932 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1933 | return -EFAULT; | |
1da177e4 | 1934 | |
5e59b791 LAD |
1935 | (*frag)->priority = skb->priority; |
1936 | ||
1da177e4 LT |
1937 | sent += count; |
1938 | len -= count; | |
1939 | ||
2d0ed3d5 GP |
1940 | skb->len += (*frag)->len; |
1941 | skb->data_len += (*frag)->len; | |
1942 | ||
1da177e4 LT |
1943 | frag = &(*frag)->next; |
1944 | } | |
1da177e4 LT |
1945 | |
1946 | return sent; | |
1c2acffb | 1947 | } |
1da177e4 | 1948 | |
5e59b791 | 1949 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
1950 | struct msghdr *msg, size_t len, |
1951 | u32 priority) | |
1c2acffb | 1952 | { |
8c1d787b | 1953 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1954 | struct sk_buff *skb; |
03a51213 | 1955 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1956 | struct l2cap_hdr *lh; |
1957 | ||
b4400672 | 1958 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
1959 | |
1960 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1961 | |
1962 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1963 | msg->msg_flags & MSG_DONTWAIT); |
1964 | if (IS_ERR(skb)) | |
1965 | return skb; | |
1c2acffb | 1966 | |
5e59b791 LAD |
1967 | skb->priority = priority; |
1968 | ||
1c2acffb GP |
1969 | /* Create L2CAP header */ |
1970 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1971 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1972 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1973 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1974 | |
0952a57a | 1975 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1976 | if (unlikely(err < 0)) { |
1977 | kfree_skb(skb); | |
1978 | return ERR_PTR(err); | |
1979 | } | |
1980 | return skb; | |
1981 | } | |
1982 | ||
5e59b791 | 1983 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
1984 | struct msghdr *msg, size_t len, |
1985 | u32 priority) | |
1c2acffb | 1986 | { |
8c1d787b | 1987 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1988 | struct sk_buff *skb; |
f2ba7fae | 1989 | int err, count; |
1c2acffb GP |
1990 | struct l2cap_hdr *lh; |
1991 | ||
b4400672 | 1992 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 1993 | |
f2ba7fae | 1994 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1995 | |
f2ba7fae | 1996 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1997 | msg->msg_flags & MSG_DONTWAIT); |
1998 | if (IS_ERR(skb)) | |
1999 | return skb; | |
1c2acffb | 2000 | |
5e59b791 LAD |
2001 | skb->priority = priority; |
2002 | ||
1c2acffb GP |
2003 | /* Create L2CAP header */ |
2004 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2005 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2006 | lh->len = cpu_to_le16(len); |
1c2acffb | 2007 | |
0952a57a | 2008 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2009 | if (unlikely(err < 0)) { |
2010 | kfree_skb(skb); | |
2011 | return ERR_PTR(err); | |
2012 | } | |
2013 | return skb; | |
2014 | } | |
2015 | ||
ab0ff76d | 2016 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2017 | struct msghdr *msg, size_t len, |
2018 | u16 sdulen) | |
1c2acffb | 2019 | { |
8c1d787b | 2020 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2021 | struct sk_buff *skb; |
e4ca6d98 | 2022 | int err, count, hlen; |
1c2acffb GP |
2023 | struct l2cap_hdr *lh; |
2024 | ||
b4400672 | 2025 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2026 | |
0ee0d208 GP |
2027 | if (!conn) |
2028 | return ERR_PTR(-ENOTCONN); | |
2029 | ||
ba7aa64f | 2030 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2031 | |
c74e560c | 2032 | if (sdulen) |
03a51213 | 2033 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2034 | |
47d1ec61 | 2035 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2036 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2037 | |
1c2acffb | 2038 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2039 | |
2040 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2041 | msg->msg_flags & MSG_DONTWAIT); |
2042 | if (IS_ERR(skb)) | |
2043 | return skb; | |
1c2acffb GP |
2044 | |
2045 | /* Create L2CAP header */ | |
2046 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2047 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2048 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2049 | |
18a48e76 MM |
2050 | /* Control header is populated later */ |
2051 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2052 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2053 | else | |
2054 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2055 | |
c74e560c | 2056 | if (sdulen) |
03a51213 | 2057 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2058 | |
0952a57a | 2059 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2060 | if (unlikely(err < 0)) { |
2061 | kfree_skb(skb); | |
2062 | return ERR_PTR(err); | |
2063 | } | |
e90bac06 | 2064 | |
18a48e76 | 2065 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2066 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2067 | return skb; |
1da177e4 LT |
2068 | } |
2069 | ||
94122bbe MM |
2070 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2071 | struct sk_buff_head *seg_queue, | |
2072 | struct msghdr *msg, size_t len) | |
c74e560c | 2073 | { |
c74e560c | 2074 | struct sk_buff *skb; |
94122bbe MM |
2075 | u16 sdu_len; |
2076 | size_t pdu_len; | |
94122bbe | 2077 | u8 sar; |
c74e560c | 2078 | |
b4400672 | 2079 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2080 | |
94122bbe MM |
2081 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2082 | * so fragmented skbs are not used. The HCI layer's handling | |
2083 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2084 | */ | |
c74e560c | 2085 | |
94122bbe MM |
2086 | /* PDU size is derived from the HCI MTU */ |
2087 | pdu_len = chan->conn->mtu; | |
c74e560c | 2088 | |
94122bbe MM |
2089 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2090 | ||
2091 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2092 | if (chan->fcs) |
2093 | pdu_len -= L2CAP_FCS_SIZE; | |
2094 | ||
ba7aa64f | 2095 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2096 | |
2097 | /* Remote device may have requested smaller PDUs */ | |
2098 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2099 | ||
2100 | if (len <= pdu_len) { | |
2101 | sar = L2CAP_SAR_UNSEGMENTED; | |
2102 | sdu_len = 0; | |
2103 | pdu_len = len; | |
2104 | } else { | |
2105 | sar = L2CAP_SAR_START; | |
2106 | sdu_len = len; | |
2107 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2108 | } | |
2109 | ||
2110 | while (len > 0) { | |
2111 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2112 | |
c74e560c | 2113 | if (IS_ERR(skb)) { |
94122bbe | 2114 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2115 | return PTR_ERR(skb); |
2116 | } | |
2117 | ||
94122bbe MM |
2118 | bt_cb(skb)->control.sar = sar; |
2119 | __skb_queue_tail(seg_queue, skb); | |
2120 | ||
2121 | len -= pdu_len; | |
2122 | if (sdu_len) { | |
2123 | sdu_len = 0; | |
2124 | pdu_len += L2CAP_SDULEN_SIZE; | |
2125 | } | |
2126 | ||
2127 | if (len <= pdu_len) { | |
2128 | sar = L2CAP_SAR_END; | |
2129 | pdu_len = len; | |
2130 | } else { | |
2131 | sar = L2CAP_SAR_CONTINUE; | |
2132 | } | |
c74e560c | 2133 | } |
c74e560c | 2134 | |
f0f62799 | 2135 | return 0; |
c74e560c GP |
2136 | } |
2137 | ||
5e59b791 LAD |
2138 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2139 | u32 priority) | |
9a91a04a | 2140 | { |
9a91a04a | 2141 | struct sk_buff *skb; |
9a91a04a | 2142 | int err; |
94122bbe | 2143 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2144 | |
2145 | /* Connectionless channel */ | |
715ec005 | 2146 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2147 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2148 | if (IS_ERR(skb)) |
2149 | return PTR_ERR(skb); | |
2150 | ||
2151 | l2cap_do_send(chan, skb); | |
2152 | return len; | |
2153 | } | |
2154 | ||
2155 | switch (chan->mode) { | |
2156 | case L2CAP_MODE_BASIC: | |
2157 | /* Check outgoing MTU */ | |
2158 | if (len > chan->omtu) | |
2159 | return -EMSGSIZE; | |
2160 | ||
2161 | /* Create a basic PDU */ | |
5e59b791 | 2162 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2163 | if (IS_ERR(skb)) |
2164 | return PTR_ERR(skb); | |
2165 | ||
2166 | l2cap_do_send(chan, skb); | |
2167 | err = len; | |
2168 | break; | |
2169 | ||
2170 | case L2CAP_MODE_ERTM: | |
2171 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2172 | /* Check outgoing MTU */ |
2173 | if (len > chan->omtu) { | |
2174 | err = -EMSGSIZE; | |
2175 | break; | |
2176 | } | |
9a91a04a | 2177 | |
94122bbe | 2178 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2179 | |
94122bbe MM |
2180 | /* Do segmentation before calling in to the state machine, |
2181 | * since it's possible to block while waiting for memory | |
2182 | * allocation. | |
2183 | */ | |
2184 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2185 | |
94122bbe MM |
2186 | /* The channel could have been closed while segmenting, |
2187 | * check that it is still connected. | |
2188 | */ | |
2189 | if (chan->state != BT_CONNECTED) { | |
2190 | __skb_queue_purge(&seg_queue); | |
2191 | err = -ENOTCONN; | |
9a91a04a GP |
2192 | } |
2193 | ||
94122bbe | 2194 | if (err) |
9a91a04a | 2195 | break; |
9a91a04a | 2196 | |
3733937d | 2197 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2198 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2199 | else |
d660366d | 2200 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2201 | |
d660366d | 2202 | err = len; |
9a91a04a | 2203 | |
94122bbe MM |
2204 | /* If the skbs were not queued for sending, they'll still be in |
2205 | * seg_queue and need to be purged. | |
2206 | */ | |
2207 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2208 | break; |
2209 | ||
2210 | default: | |
2211 | BT_DBG("bad state %1.1x", chan->mode); | |
2212 | err = -EBADFD; | |
2213 | } | |
2214 | ||
2215 | return err; | |
2216 | } | |
2217 | ||
d2a7ac5d MM |
2218 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2219 | { | |
bed68bde MM |
2220 | struct l2cap_ctrl control; |
2221 | u16 seq; | |
2222 | ||
b4400672 | 2223 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2224 | |
2225 | memset(&control, 0, sizeof(control)); | |
2226 | control.sframe = 1; | |
2227 | control.super = L2CAP_SUPER_SREJ; | |
2228 | ||
2229 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2230 | seq = __next_seq(chan, seq)) { | |
2231 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2232 | control.reqseq = seq; | |
2233 | l2cap_send_sframe(chan, &control); | |
2234 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2239 | } |
2240 | ||
2241 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2242 | { | |
bed68bde MM |
2243 | struct l2cap_ctrl control; |
2244 | ||
2245 | BT_DBG("chan %p", chan); | |
2246 | ||
2247 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2248 | return; | |
2249 | ||
2250 | memset(&control, 0, sizeof(control)); | |
2251 | control.sframe = 1; | |
2252 | control.super = L2CAP_SUPER_SREJ; | |
2253 | control.reqseq = chan->srej_list.tail; | |
2254 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2255 | } |
2256 | ||
2257 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2258 | { | |
bed68bde MM |
2259 | struct l2cap_ctrl control; |
2260 | u16 initial_head; | |
2261 | u16 seq; | |
2262 | ||
b4400672 | 2263 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2264 | |
2265 | memset(&control, 0, sizeof(control)); | |
2266 | control.sframe = 1; | |
2267 | control.super = L2CAP_SUPER_SREJ; | |
2268 | ||
2269 | /* Capture initial list head to allow only one pass through the list. */ | |
2270 | initial_head = chan->srej_list.head; | |
2271 | ||
2272 | do { | |
2273 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2274 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2275 | break; | |
2276 | ||
2277 | control.reqseq = seq; | |
2278 | l2cap_send_sframe(chan, &control); | |
2279 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2280 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2281 | } |
2282 | ||
608bcc6d MM |
2283 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2284 | { | |
2285 | struct sk_buff *acked_skb; | |
2286 | u16 ackseq; | |
2287 | ||
b4400672 | 2288 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2289 | |
2290 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2291 | return; | |
2292 | ||
b4400672 | 2293 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2294 | chan->expected_ack_seq, chan->unacked_frames); |
2295 | ||
2296 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2297 | ackseq = __next_seq(chan, ackseq)) { | |
2298 | ||
2299 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2300 | if (acked_skb) { | |
2301 | skb_unlink(acked_skb, &chan->tx_q); | |
2302 | kfree_skb(acked_skb); | |
2303 | chan->unacked_frames--; | |
2304 | } | |
2305 | } | |
2306 | ||
2307 | chan->expected_ack_seq = reqseq; | |
2308 | ||
2309 | if (chan->unacked_frames == 0) | |
2310 | __clear_retrans_timer(chan); | |
2311 | ||
b4400672 | 2312 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2313 | } |
2314 | ||
2315 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2316 | { | |
2317 | BT_DBG("chan %p", chan); | |
2318 | ||
2319 | chan->expected_tx_seq = chan->buffer_seq; | |
2320 | l2cap_seq_list_clear(&chan->srej_list); | |
2321 | skb_queue_purge(&chan->srej_q); | |
2322 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2323 | } | |
2324 | ||
d660366d GP |
2325 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2326 | struct l2cap_ctrl *control, | |
2327 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2328 | { |
608bcc6d MM |
2329 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2330 | event); | |
2331 | ||
2332 | switch (event) { | |
2333 | case L2CAP_EV_DATA_REQUEST: | |
2334 | if (chan->tx_send_head == NULL) | |
2335 | chan->tx_send_head = skb_peek(skbs); | |
2336 | ||
2337 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2338 | l2cap_ertm_send(chan); | |
2339 | break; | |
2340 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2341 | BT_DBG("Enter LOCAL_BUSY"); | |
2342 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2343 | ||
2344 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2345 | /* The SREJ_SENT state must be aborted if we are to | |
2346 | * enter the LOCAL_BUSY state. | |
2347 | */ | |
2348 | l2cap_abort_rx_srej_sent(chan); | |
2349 | } | |
2350 | ||
2351 | l2cap_send_ack(chan); | |
2352 | ||
2353 | break; | |
2354 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2355 | BT_DBG("Exit LOCAL_BUSY"); | |
2356 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2357 | ||
2358 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2359 | struct l2cap_ctrl local_control; | |
2360 | ||
2361 | memset(&local_control, 0, sizeof(local_control)); | |
2362 | local_control.sframe = 1; | |
2363 | local_control.super = L2CAP_SUPER_RR; | |
2364 | local_control.poll = 1; | |
2365 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2366 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2367 | |
2368 | chan->retry_count = 1; | |
2369 | __set_monitor_timer(chan); | |
2370 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2371 | } | |
2372 | break; | |
2373 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2374 | l2cap_process_reqseq(chan, control->reqseq); | |
2375 | break; | |
2376 | case L2CAP_EV_EXPLICIT_POLL: | |
2377 | l2cap_send_rr_or_rnr(chan, 1); | |
2378 | chan->retry_count = 1; | |
2379 | __set_monitor_timer(chan); | |
2380 | __clear_ack_timer(chan); | |
2381 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2382 | break; | |
2383 | case L2CAP_EV_RETRANS_TO: | |
2384 | l2cap_send_rr_or_rnr(chan, 1); | |
2385 | chan->retry_count = 1; | |
2386 | __set_monitor_timer(chan); | |
2387 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2388 | break; | |
2389 | case L2CAP_EV_RECV_FBIT: | |
2390 | /* Nothing to process */ | |
2391 | break; | |
2392 | default: | |
2393 | break; | |
2394 | } | |
608bcc6d MM |
2395 | } |
2396 | ||
d660366d GP |
2397 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2398 | struct l2cap_ctrl *control, | |
2399 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2400 | { |
608bcc6d MM |
2401 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2402 | event); | |
2403 | ||
2404 | switch (event) { | |
2405 | case L2CAP_EV_DATA_REQUEST: | |
2406 | if (chan->tx_send_head == NULL) | |
2407 | chan->tx_send_head = skb_peek(skbs); | |
2408 | /* Queue data, but don't send. */ | |
2409 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2410 | break; | |
2411 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2412 | BT_DBG("Enter LOCAL_BUSY"); | |
2413 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2414 | ||
2415 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2416 | /* The SREJ_SENT state must be aborted if we are to | |
2417 | * enter the LOCAL_BUSY state. | |
2418 | */ | |
2419 | l2cap_abort_rx_srej_sent(chan); | |
2420 | } | |
2421 | ||
2422 | l2cap_send_ack(chan); | |
2423 | ||
2424 | break; | |
2425 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2426 | BT_DBG("Exit LOCAL_BUSY"); | |
2427 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2428 | ||
2429 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2430 | struct l2cap_ctrl local_control; | |
2431 | memset(&local_control, 0, sizeof(local_control)); | |
2432 | local_control.sframe = 1; | |
2433 | local_control.super = L2CAP_SUPER_RR; | |
2434 | local_control.poll = 1; | |
2435 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2436 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2437 | |
2438 | chan->retry_count = 1; | |
2439 | __set_monitor_timer(chan); | |
2440 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2441 | } | |
2442 | break; | |
2443 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2444 | l2cap_process_reqseq(chan, control->reqseq); | |
2445 | ||
2446 | /* Fall through */ | |
2447 | ||
2448 | case L2CAP_EV_RECV_FBIT: | |
2449 | if (control && control->final) { | |
2450 | __clear_monitor_timer(chan); | |
2451 | if (chan->unacked_frames > 0) | |
2452 | __set_retrans_timer(chan); | |
2453 | chan->retry_count = 0; | |
2454 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2455 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2456 | } | |
2457 | break; | |
2458 | case L2CAP_EV_EXPLICIT_POLL: | |
2459 | /* Ignore */ | |
2460 | break; | |
2461 | case L2CAP_EV_MONITOR_TO: | |
2462 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2463 | l2cap_send_rr_or_rnr(chan, 1); | |
2464 | __set_monitor_timer(chan); | |
2465 | chan->retry_count++; | |
2466 | } else { | |
2467 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2468 | } | |
2469 | break; | |
2470 | default: | |
2471 | break; | |
2472 | } | |
608bcc6d MM |
2473 | } |
2474 | ||
d660366d GP |
2475 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2476 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2477 | { |
608bcc6d MM |
2478 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2479 | chan, control, skbs, event, chan->tx_state); | |
2480 | ||
2481 | switch (chan->tx_state) { | |
2482 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2483 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2484 | break; |
2485 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2486 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2487 | break; |
2488 | default: | |
2489 | /* Ignore event */ | |
2490 | break; | |
2491 | } | |
608bcc6d MM |
2492 | } |
2493 | ||
4b51dae9 MM |
2494 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2495 | struct l2cap_ctrl *control) | |
2496 | { | |
2497 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2498 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2499 | } |
2500 | ||
f80842a8 MM |
2501 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2502 | struct l2cap_ctrl *control) | |
2503 | { | |
2504 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2505 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2506 | } |
2507 | ||
1da177e4 LT |
2508 | /* Copy frame to all raw sockets on that connection */ |
2509 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2510 | { | |
1da177e4 | 2511 | struct sk_buff *nskb; |
48454079 | 2512 | struct l2cap_chan *chan; |
1da177e4 LT |
2513 | |
2514 | BT_DBG("conn %p", conn); | |
2515 | ||
3df91ea2 | 2516 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2517 | |
3df91ea2 | 2518 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2519 | struct sock *sk = chan->sk; |
715ec005 | 2520 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2521 | continue; |
2522 | ||
2523 | /* Don't send frame to the socket it came from */ | |
2524 | if (skb->sk == sk) | |
2525 | continue; | |
af05b30b GP |
2526 | nskb = skb_clone(skb, GFP_ATOMIC); |
2527 | if (!nskb) | |
1da177e4 LT |
2528 | continue; |
2529 | ||
80b98027 | 2530 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2531 | kfree_skb(nskb); |
2532 | } | |
3d57dc68 | 2533 | |
3df91ea2 | 2534 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2535 | } |
2536 | ||
2537 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2538 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2539 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2540 | { |
2541 | struct sk_buff *skb, **frag; | |
2542 | struct l2cap_cmd_hdr *cmd; | |
2543 | struct l2cap_hdr *lh; | |
2544 | int len, count; | |
2545 | ||
b4400672 AE |
2546 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2547 | conn, code, ident, dlen); | |
1da177e4 LT |
2548 | |
2549 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2550 | count = min_t(unsigned int, conn->mtu, len); | |
2551 | ||
2552 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2553 | if (!skb) | |
2554 | return NULL; | |
2555 | ||
2556 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2557 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2558 | |
2559 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2560 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2561 | else |
ac73498c | 2562 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2563 | |
2564 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2565 | cmd->code = code; | |
2566 | cmd->ident = ident; | |
aca3192c | 2567 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2568 | |
2569 | if (dlen) { | |
2570 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2571 | memcpy(skb_put(skb, count), data, count); | |
2572 | data += count; | |
2573 | } | |
2574 | ||
2575 | len -= skb->len; | |
2576 | ||
2577 | /* Continuation fragments (no L2CAP header) */ | |
2578 | frag = &skb_shinfo(skb)->frag_list; | |
2579 | while (len) { | |
2580 | count = min_t(unsigned int, conn->mtu, len); | |
2581 | ||
2582 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2583 | if (!*frag) | |
2584 | goto fail; | |
2585 | ||
2586 | memcpy(skb_put(*frag, count), data, count); | |
2587 | ||
2588 | len -= count; | |
2589 | data += count; | |
2590 | ||
2591 | frag = &(*frag)->next; | |
2592 | } | |
2593 | ||
2594 | return skb; | |
2595 | ||
2596 | fail: | |
2597 | kfree_skb(skb); | |
2598 | return NULL; | |
2599 | } | |
2600 | ||
2601 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2602 | { | |
2603 | struct l2cap_conf_opt *opt = *ptr; | |
2604 | int len; | |
2605 | ||
2606 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2607 | *ptr += len; | |
2608 | ||
2609 | *type = opt->type; | |
2610 | *olen = opt->len; | |
2611 | ||
2612 | switch (opt->len) { | |
2613 | case 1: | |
2614 | *val = *((u8 *) opt->val); | |
2615 | break; | |
2616 | ||
2617 | case 2: | |
bfaaeb3e | 2618 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2619 | break; |
2620 | ||
2621 | case 4: | |
bfaaeb3e | 2622 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2623 | break; |
2624 | ||
2625 | default: | |
2626 | *val = (unsigned long) opt->val; | |
2627 | break; | |
2628 | } | |
2629 | ||
b4400672 | 2630 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2631 | return len; |
2632 | } | |
2633 | ||
1da177e4 LT |
2634 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2635 | { | |
2636 | struct l2cap_conf_opt *opt = *ptr; | |
2637 | ||
b4400672 | 2638 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2639 | |
2640 | opt->type = type; | |
2641 | opt->len = len; | |
2642 | ||
2643 | switch (len) { | |
2644 | case 1: | |
2645 | *((u8 *) opt->val) = val; | |
2646 | break; | |
2647 | ||
2648 | case 2: | |
4f8b691c | 2649 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2650 | break; |
2651 | ||
2652 | case 4: | |
4f8b691c | 2653 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2654 | break; |
2655 | ||
2656 | default: | |
2657 | memcpy(opt->val, (void *) val, len); | |
2658 | break; | |
2659 | } | |
2660 | ||
2661 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2662 | } | |
2663 | ||
f89cef09 AE |
2664 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2665 | { | |
2666 | struct l2cap_conf_efs efs; | |
2667 | ||
1ec918ce | 2668 | switch (chan->mode) { |
f89cef09 AE |
2669 | case L2CAP_MODE_ERTM: |
2670 | efs.id = chan->local_id; | |
2671 | efs.stype = chan->local_stype; | |
2672 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2673 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c AE |
2674 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2675 | efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2676 | break; |
2677 | ||
2678 | case L2CAP_MODE_STREAMING: | |
2679 | efs.id = 1; | |
2680 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2681 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2682 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2683 | efs.acc_lat = 0; | |
2684 | efs.flush_to = 0; | |
2685 | break; | |
2686 | ||
2687 | default: | |
2688 | return; | |
2689 | } | |
2690 | ||
2691 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2692 | (unsigned long) &efs); | |
2693 | } | |
2694 | ||
721c4181 | 2695 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2696 | { |
721c4181 | 2697 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2698 | ack_timer.work); |
2699 | u16 frames_to_ack; | |
c1b4f43b | 2700 | |
2fb9b3d4 GP |
2701 | BT_DBG("chan %p", chan); |
2702 | ||
6be36555 AE |
2703 | l2cap_chan_lock(chan); |
2704 | ||
0362520b MM |
2705 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2706 | chan->last_acked_seq); | |
6be36555 | 2707 | |
0362520b MM |
2708 | if (frames_to_ack) |
2709 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2710 | |
0362520b | 2711 | l2cap_chan_unlock(chan); |
09bfb2ee | 2712 | l2cap_chan_put(chan); |
c1b4f43b GP |
2713 | } |
2714 | ||
466f8004 | 2715 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2716 | { |
3c588192 MM |
2717 | int err; |
2718 | ||
105bdf9e MM |
2719 | chan->next_tx_seq = 0; |
2720 | chan->expected_tx_seq = 0; | |
42e5c802 | 2721 | chan->expected_ack_seq = 0; |
6a026610 | 2722 | chan->unacked_frames = 0; |
42e5c802 | 2723 | chan->buffer_seq = 0; |
6a026610 | 2724 | chan->frames_sent = 0; |
105bdf9e MM |
2725 | chan->last_acked_seq = 0; |
2726 | chan->sdu = NULL; | |
2727 | chan->sdu_last_frag = NULL; | |
2728 | chan->sdu_len = 0; | |
2729 | ||
d34c34fb MM |
2730 | skb_queue_head_init(&chan->tx_q); |
2731 | ||
105bdf9e MM |
2732 | if (chan->mode != L2CAP_MODE_ERTM) |
2733 | return 0; | |
2734 | ||
2735 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2736 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2737 | |
721c4181 GP |
2738 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2739 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2740 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2741 | |
f1c6775b | 2742 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2743 | |
3c588192 MM |
2744 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2745 | if (err < 0) | |
2746 | return err; | |
2747 | ||
9dc9affc MM |
2748 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2749 | if (err < 0) | |
2750 | l2cap_seq_list_free(&chan->srej_list); | |
2751 | ||
2752 | return err; | |
0565c1c2 GP |
2753 | } |
2754 | ||
f2fcfcd6 GP |
2755 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2756 | { | |
2757 | switch (mode) { | |
2758 | case L2CAP_MODE_STREAMING: | |
2759 | case L2CAP_MODE_ERTM: | |
2760 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2761 | return mode; | |
2762 | /* fall through */ | |
2763 | default: | |
2764 | return L2CAP_MODE_BASIC; | |
2765 | } | |
2766 | } | |
2767 | ||
6327eb98 AE |
2768 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2769 | { | |
2770 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2771 | } | |
2772 | ||
f89cef09 AE |
2773 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2774 | { | |
2775 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2776 | } | |
2777 | ||
6327eb98 AE |
2778 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2779 | { | |
2780 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2781 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2782 | /* use extended control field */ |
2783 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2784 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2785 | } else { | |
6327eb98 AE |
2786 | chan->tx_win = min_t(u16, chan->tx_win, |
2787 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2788 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2789 | } | |
c20f8e35 | 2790 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2791 | } |
2792 | ||
710f9b0a | 2793 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2794 | { |
1da177e4 | 2795 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2796 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2797 | void *ptr = req->data; |
c8f79162 | 2798 | u16 size; |
1da177e4 | 2799 | |
49208c9c | 2800 | BT_DBG("chan %p", chan); |
1da177e4 | 2801 | |
73ffa904 | 2802 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2803 | goto done; |
2804 | ||
0c1bc5c6 | 2805 | switch (chan->mode) { |
f2fcfcd6 GP |
2806 | case L2CAP_MODE_STREAMING: |
2807 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2808 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2809 | break; |
85eb53c6 | 2810 | |
f89cef09 AE |
2811 | if (__l2cap_efs_supported(chan)) |
2812 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2813 | ||
2ba13ed6 | 2814 | /* fall through */ |
f2fcfcd6 | 2815 | default: |
8c1d787b | 2816 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2817 | break; |
2818 | } | |
2819 | ||
2820 | done: | |
0c1bc5c6 GP |
2821 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2822 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2823 | |
0c1bc5c6 | 2824 | switch (chan->mode) { |
65c7c491 | 2825 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2826 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2827 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2828 | break; |
2829 | ||
62547752 GP |
2830 | rfc.mode = L2CAP_MODE_BASIC; |
2831 | rfc.txwin_size = 0; | |
2832 | rfc.max_transmit = 0; | |
2833 | rfc.retrans_timeout = 0; | |
2834 | rfc.monitor_timeout = 0; | |
2835 | rfc.max_pdu_size = 0; | |
2836 | ||
63406504 GP |
2837 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2838 | (unsigned long) &rfc); | |
65c7c491 MH |
2839 | break; |
2840 | ||
2841 | case L2CAP_MODE_ERTM: | |
2842 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2843 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2844 | rfc.retrans_timeout = 0; |
2845 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2846 | |
2847 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2848 | L2CAP_EXT_HDR_SIZE - | |
2849 | L2CAP_SDULEN_SIZE - | |
2850 | L2CAP_FCS_SIZE); | |
2851 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2852 | |
6327eb98 AE |
2853 | l2cap_txwin_setup(chan); |
2854 | ||
2855 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2856 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2857 | |
63406504 GP |
2858 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2859 | (unsigned long) &rfc); | |
2860 | ||
f89cef09 AE |
2861 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2862 | l2cap_add_opt_efs(&ptr, chan); | |
2863 | ||
8c1d787b | 2864 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2865 | break; |
2866 | ||
47d1ec61 | 2867 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2868 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2869 | chan->fcs = L2CAP_FCS_NONE; |
2870 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2871 | } |
6327eb98 AE |
2872 | |
2873 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2874 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2875 | chan->tx_win); | |
f2fcfcd6 GP |
2876 | break; |
2877 | ||
2878 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2879 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2880 | rfc.mode = L2CAP_MODE_STREAMING; |
2881 | rfc.txwin_size = 0; | |
2882 | rfc.max_transmit = 0; | |
2883 | rfc.retrans_timeout = 0; | |
2884 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2885 | |
2886 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2887 | L2CAP_EXT_HDR_SIZE - | |
2888 | L2CAP_SDULEN_SIZE - | |
2889 | L2CAP_FCS_SIZE); | |
2890 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2891 | |
63406504 GP |
2892 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2893 | (unsigned long) &rfc); | |
2894 | ||
f89cef09 AE |
2895 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2896 | l2cap_add_opt_efs(&ptr, chan); | |
2897 | ||
8c1d787b | 2898 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2899 | break; |
2900 | ||
47d1ec61 | 2901 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2902 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2903 | chan->fcs = L2CAP_FCS_NONE; |
2904 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2905 | } |
65c7c491 MH |
2906 | break; |
2907 | } | |
1da177e4 | 2908 | |
fe4128e0 | 2909 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2910 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2911 | |
2912 | return ptr - data; | |
2913 | } | |
2914 | ||
73ffa904 | 2915 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2916 | { |
5dee9e7c MH |
2917 | struct l2cap_conf_rsp *rsp = data; |
2918 | void *ptr = rsp->data; | |
73ffa904 GP |
2919 | void *req = chan->conf_req; |
2920 | int len = chan->conf_len; | |
5dee9e7c MH |
2921 | int type, hint, olen; |
2922 | unsigned long val; | |
6464f35f | 2923 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2924 | struct l2cap_conf_efs efs; |
2925 | u8 remote_efs = 0; | |
861d6882 | 2926 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2927 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2928 | u16 size; |
1da177e4 | 2929 | |
73ffa904 | 2930 | BT_DBG("chan %p", chan); |
820ae1b8 | 2931 | |
5dee9e7c MH |
2932 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2933 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2934 | |
589d2746 | 2935 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2936 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2937 | |
2938 | switch (type) { | |
2939 | case L2CAP_CONF_MTU: | |
861d6882 | 2940 | mtu = val; |
5dee9e7c MH |
2941 | break; |
2942 | ||
2943 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2944 | chan->flush_to = val; |
5dee9e7c MH |
2945 | break; |
2946 | ||
2947 | case L2CAP_CONF_QOS: | |
2948 | break; | |
2949 | ||
6464f35f MH |
2950 | case L2CAP_CONF_RFC: |
2951 | if (olen == sizeof(rfc)) | |
2952 | memcpy(&rfc, (void *) val, olen); | |
2953 | break; | |
2954 | ||
fcc203c3 GP |
2955 | case L2CAP_CONF_FCS: |
2956 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2957 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2958 | break; |
fcc203c3 | 2959 | |
42dceae2 AE |
2960 | case L2CAP_CONF_EFS: |
2961 | remote_efs = 1; | |
2962 | if (olen == sizeof(efs)) | |
2963 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2964 | break; |
2965 | ||
6327eb98 AE |
2966 | case L2CAP_CONF_EWS: |
2967 | if (!enable_hs) | |
2968 | return -ECONNREFUSED; | |
fcc203c3 | 2969 | |
6327eb98 AE |
2970 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2971 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2972 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2973 | chan->remote_tx_win = val; |
fcc203c3 GP |
2974 | break; |
2975 | ||
5dee9e7c MH |
2976 | default: |
2977 | if (hint) | |
2978 | break; | |
2979 | ||
2980 | result = L2CAP_CONF_UNKNOWN; | |
2981 | *((u8 *) ptr++) = type; | |
2982 | break; | |
2983 | } | |
2984 | } | |
2985 | ||
73ffa904 | 2986 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2987 | goto done; |
2988 | ||
0c1bc5c6 | 2989 | switch (chan->mode) { |
f2fcfcd6 GP |
2990 | case L2CAP_MODE_STREAMING: |
2991 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2992 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2993 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2994 | chan->conn->feat_mask); |
85eb53c6 GP |
2995 | break; |
2996 | } | |
2997 | ||
42dceae2 AE |
2998 | if (remote_efs) { |
2999 | if (__l2cap_efs_supported(chan)) | |
3000 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3001 | else | |
3002 | return -ECONNREFUSED; | |
3003 | } | |
3004 | ||
0c1bc5c6 | 3005 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3006 | return -ECONNREFUSED; |
742e519b | 3007 | |
f2fcfcd6 | 3008 | break; |
f2fcfcd6 GP |
3009 | } |
3010 | ||
3011 | done: | |
0c1bc5c6 | 3012 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3013 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3014 | rfc.mode = chan->mode; |
f2fcfcd6 | 3015 | |
73ffa904 | 3016 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3017 | return -ECONNREFUSED; |
3018 | ||
3019 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3020 | sizeof(rfc), (unsigned long) &rfc); | |
3021 | } | |
3022 | ||
5dee9e7c MH |
3023 | if (result == L2CAP_CONF_SUCCESS) { |
3024 | /* Configure output options and let the other side know | |
3025 | * which ones we don't like. */ | |
3026 | ||
f2fcfcd6 GP |
3027 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3028 | result = L2CAP_CONF_UNACCEPT; | |
3029 | else { | |
0c1bc5c6 | 3030 | chan->omtu = mtu; |
c1360a1c | 3031 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3032 | } |
0c1bc5c6 | 3033 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3034 | |
42dceae2 AE |
3035 | if (remote_efs) { |
3036 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3037 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3038 | efs.stype != chan->local_stype) { | |
3039 | ||
3040 | result = L2CAP_CONF_UNACCEPT; | |
3041 | ||
3042 | if (chan->num_conf_req >= 1) | |
3043 | return -ECONNREFUSED; | |
3044 | ||
3045 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3046 | sizeof(efs), |
42dceae2 | 3047 | (unsigned long) &efs); |
0e8b207e | 3048 | } else { |
3e6b3b95 | 3049 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3050 | result = L2CAP_CONF_PENDING; |
3051 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3052 | } |
3053 | } | |
3054 | ||
f2fcfcd6 GP |
3055 | switch (rfc.mode) { |
3056 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3057 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3058 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3059 | break; |
3060 | ||
3061 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3062 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3063 | chan->remote_tx_win = rfc.txwin_size; | |
3064 | else | |
3065 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3066 | |
2c03a7a4 | 3067 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3068 | |
c8f79162 AE |
3069 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3070 | chan->conn->mtu - | |
3071 | L2CAP_EXT_HDR_SIZE - | |
3072 | L2CAP_SDULEN_SIZE - | |
3073 | L2CAP_FCS_SIZE); | |
3074 | rfc.max_pdu_size = cpu_to_le16(size); | |
3075 | chan->remote_mps = size; | |
f2fcfcd6 | 3076 | |
10467e9e | 3077 | rfc.retrans_timeout = |
4fd21a88 | 3078 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3079 | rfc.monitor_timeout = |
4fd21a88 | 3080 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3081 | |
c1360a1c | 3082 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3083 | |
3084 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3085 | sizeof(rfc), (unsigned long) &rfc); | |
3086 | ||
42dceae2 AE |
3087 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3088 | chan->remote_id = efs.id; | |
3089 | chan->remote_stype = efs.stype; | |
3090 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3091 | chan->remote_flush_to = | |
3092 | le32_to_cpu(efs.flush_to); | |
3093 | chan->remote_acc_lat = | |
3094 | le32_to_cpu(efs.acc_lat); | |
3095 | chan->remote_sdu_itime = | |
3096 | le32_to_cpu(efs.sdu_itime); | |
3097 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3098 | sizeof(efs), (unsigned long) &efs); | |
3099 | } | |
f2fcfcd6 GP |
3100 | break; |
3101 | ||
3102 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3103 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3104 | chan->conn->mtu - | |
3105 | L2CAP_EXT_HDR_SIZE - | |
3106 | L2CAP_SDULEN_SIZE - | |
3107 | L2CAP_FCS_SIZE); | |
3108 | rfc.max_pdu_size = cpu_to_le16(size); | |
3109 | chan->remote_mps = size; | |
f2fcfcd6 | 3110 | |
c1360a1c | 3111 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3112 | |
3113 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3114 | sizeof(rfc), (unsigned long) &rfc); | |
3115 | ||
f2fcfcd6 GP |
3116 | break; |
3117 | ||
3118 | default: | |
5dee9e7c | 3119 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3120 | |
6464f35f | 3121 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3122 | rfc.mode = chan->mode; |
f2fcfcd6 | 3123 | } |
6464f35f | 3124 | |
f2fcfcd6 | 3125 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3126 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3127 | } |
fe4128e0 | 3128 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3129 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3130 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3131 | |
3132 | return ptr - data; | |
1da177e4 LT |
3133 | } |
3134 | ||
b4450035 | 3135 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3136 | { |
f2fcfcd6 GP |
3137 | struct l2cap_conf_req *req = data; |
3138 | void *ptr = req->data; | |
3139 | int type, olen; | |
3140 | unsigned long val; | |
36e999a8 | 3141 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3142 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3143 | |
fe4128e0 | 3144 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3145 | |
3146 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3147 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3148 | ||
3149 | switch (type) { | |
3150 | case L2CAP_CONF_MTU: | |
3151 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3152 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3153 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3154 | } else |
0c1bc5c6 GP |
3155 | chan->imtu = val; |
3156 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3157 | break; |
3158 | ||
3159 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3160 | chan->flush_to = val; |
f2fcfcd6 | 3161 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3162 | 2, chan->flush_to); |
f2fcfcd6 GP |
3163 | break; |
3164 | ||
3165 | case L2CAP_CONF_RFC: | |
3166 | if (olen == sizeof(rfc)) | |
3167 | memcpy(&rfc, (void *)val, olen); | |
3168 | ||
c1360a1c | 3169 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3170 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3171 | return -ECONNREFUSED; |
3172 | ||
47d1ec61 | 3173 | chan->fcs = 0; |
f2fcfcd6 GP |
3174 | |
3175 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3176 | sizeof(rfc), (unsigned long) &rfc); | |
3177 | break; | |
6327eb98 AE |
3178 | |
3179 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3180 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3181 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3182 | chan->tx_win); |
6327eb98 | 3183 | break; |
66af7aaf AE |
3184 | |
3185 | case L2CAP_CONF_EFS: | |
3186 | if (olen == sizeof(efs)) | |
3187 | memcpy(&efs, (void *)val, olen); | |
3188 | ||
3189 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3190 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3191 | efs.stype != chan->local_stype) | |
3192 | return -ECONNREFUSED; | |
3193 | ||
3194 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3195 | sizeof(efs), (unsigned long) &efs); | |
3196 | break; | |
f2fcfcd6 GP |
3197 | } |
3198 | } | |
3199 | ||
0c1bc5c6 | 3200 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3201 | return -ECONNREFUSED; |
3202 | ||
0c1bc5c6 | 3203 | chan->mode = rfc.mode; |
6c2ea7a8 | 3204 | |
0e8b207e | 3205 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3206 | switch (rfc.mode) { |
3207 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3208 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3209 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3210 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3211 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3212 | chan->ack_win = min_t(u16, chan->ack_win, | |
3213 | rfc.txwin_size); | |
66af7aaf AE |
3214 | |
3215 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3216 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3217 | chan->local_sdu_itime = | |
3218 | le32_to_cpu(efs.sdu_itime); | |
3219 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3220 | chan->local_flush_to = | |
3221 | le32_to_cpu(efs.flush_to); | |
3222 | } | |
f2fcfcd6 | 3223 | break; |
66af7aaf | 3224 | |
f2fcfcd6 | 3225 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3226 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3227 | } |
3228 | } | |
3229 | ||
fe4128e0 | 3230 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3231 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3232 | |
3233 | return ptr - data; | |
3234 | } | |
3235 | ||
fe4128e0 | 3236 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3237 | { |
3238 | struct l2cap_conf_rsp *rsp = data; | |
3239 | void *ptr = rsp->data; | |
1da177e4 | 3240 | |
fe4128e0 | 3241 | BT_DBG("chan %p", chan); |
1da177e4 | 3242 | |
fe4128e0 | 3243 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3244 | rsp->result = cpu_to_le16(result); |
aca3192c | 3245 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3246 | |
3247 | return ptr - data; | |
3248 | } | |
3249 | ||
8c1d787b | 3250 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3251 | { |
3252 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3253 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3254 | u8 buf[128]; |
3255 | ||
fe4128e0 GP |
3256 | rsp.scid = cpu_to_le16(chan->dcid); |
3257 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3258 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3259 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3260 | l2cap_send_cmd(conn, chan->ident, |
3261 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3262 | ||
c1360a1c | 3263 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3264 | return; |
3265 | ||
710f9b0a GP |
3266 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3267 | l2cap_build_conf_req(chan, buf), buf); | |
3268 | chan->num_conf_req++; | |
3269 | } | |
3270 | ||
47d1ec61 | 3271 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3272 | { |
7b1c0049 GP |
3273 | int type, olen; |
3274 | unsigned long val; | |
c20f8e35 MM |
3275 | /* Use sane default values in case a misbehaving remote device |
3276 | * did not send an RFC or extended window size option. | |
3277 | */ | |
3278 | u16 txwin_ext = chan->ack_win; | |
3279 | struct l2cap_conf_rfc rfc = { | |
3280 | .mode = chan->mode, | |
3281 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3282 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3283 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3284 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3285 | }; | |
7b1c0049 | 3286 | |
47d1ec61 | 3287 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3288 | |
0c1bc5c6 | 3289 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3290 | return; |
3291 | ||
3292 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3293 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3294 | ||
c20f8e35 MM |
3295 | switch (type) { |
3296 | case L2CAP_CONF_RFC: | |
3297 | if (olen == sizeof(rfc)) | |
3298 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3299 | break; |
c20f8e35 MM |
3300 | case L2CAP_CONF_EWS: |
3301 | txwin_ext = val; | |
3302 | break; | |
3303 | } | |
7b1c0049 GP |
3304 | } |
3305 | ||
7b1c0049 GP |
3306 | switch (rfc.mode) { |
3307 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3308 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3309 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3310 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3311 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3312 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3313 | else | |
3314 | chan->ack_win = min_t(u16, chan->ack_win, | |
3315 | rfc.txwin_size); | |
7b1c0049 GP |
3316 | break; |
3317 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3318 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3319 | } |
3320 | } | |
3321 | ||
4e8402a3 MH |
3322 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3323 | { | |
e2fd318e | 3324 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3325 | |
e2fd318e | 3326 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3327 | return 0; |
3328 | ||
3329 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3330 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3331 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3332 | |
3333 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3334 | conn->info_ident = 0; |
984947dc | 3335 | |
4e8402a3 MH |
3336 | l2cap_conn_start(conn); |
3337 | } | |
3338 | ||
3339 | return 0; | |
3340 | } | |
3341 | ||
1da177e4 LT |
3342 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3343 | { | |
1da177e4 LT |
3344 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3345 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3346 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3347 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3348 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3349 | |
3350 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3351 | __le16 psm = req->psm; |
1da177e4 | 3352 | |
097db76c | 3353 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3354 | |
3355 | /* Check if we have socket listening on psm */ | |
c2287681 | 3356 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3357 | if (!pchan) { |
1da177e4 LT |
3358 | result = L2CAP_CR_BAD_PSM; |
3359 | goto sendresp; | |
3360 | } | |
3361 | ||
23691d75 GP |
3362 | parent = pchan->sk; |
3363 | ||
3df91ea2 | 3364 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3365 | lock_sock(parent); |
e0f0cb56 | 3366 | |
e7c29cb1 | 3367 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3368 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3369 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3370 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3371 | result = L2CAP_CR_SEC_BLOCK; |
3372 | goto response; | |
3373 | } | |
3374 | ||
1da177e4 LT |
3375 | result = L2CAP_CR_NO_MEM; |
3376 | ||
2dfa1003 GP |
3377 | /* Check if we already have channel with that dcid */ |
3378 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3379 | goto response; | |
3380 | ||
80b98027 | 3381 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3382 | if (!chan) |
1da177e4 LT |
3383 | goto response; |
3384 | ||
80808e43 GP |
3385 | sk = chan->sk; |
3386 | ||
1da177e4 LT |
3387 | hci_conn_hold(conn->hcon); |
3388 | ||
1da177e4 LT |
3389 | bacpy(&bt_sk(sk)->src, conn->src); |
3390 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3391 | chan->psm = psm; |
3392 | chan->dcid = scid; | |
1da177e4 | 3393 | |
d1010240 GP |
3394 | bt_accept_enqueue(parent, sk); |
3395 | ||
6be36555 | 3396 | __l2cap_chan_add(conn, chan); |
48454079 | 3397 | |
fe4128e0 | 3398 | dcid = chan->scid; |
1da177e4 | 3399 | |
c9b66675 | 3400 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3401 | |
fc7f8a7e | 3402 | chan->ident = cmd->ident; |
1da177e4 | 3403 | |
984947dc | 3404 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3405 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3406 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3407 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3408 | result = L2CAP_CR_PEND; |
3409 | status = L2CAP_CS_AUTHOR_PEND; | |
3410 | parent->sk_data_ready(parent, 0); | |
3411 | } else { | |
0e587be7 | 3412 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3413 | result = L2CAP_CR_SUCCESS; |
3414 | status = L2CAP_CS_NO_INFO; | |
3415 | } | |
79d554a6 | 3416 | } else { |
0e587be7 | 3417 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3418 | result = L2CAP_CR_PEND; |
3419 | status = L2CAP_CS_AUTHEN_PEND; | |
3420 | } | |
3421 | } else { | |
0e587be7 | 3422 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3423 | result = L2CAP_CR_PEND; |
3424 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3425 | } |
3426 | ||
1da177e4 | 3427 | response: |
aa2ac881 | 3428 | release_sock(parent); |
3df91ea2 | 3429 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3430 | |
3431 | sendresp: | |
aca3192c YH |
3432 | rsp.scid = cpu_to_le16(scid); |
3433 | rsp.dcid = cpu_to_le16(dcid); | |
3434 | rsp.result = cpu_to_le16(result); | |
3435 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3436 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3437 | |
3438 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3439 | struct l2cap_info_req info; | |
ac73498c | 3440 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3441 | |
3442 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3443 | conn->info_ident = l2cap_get_ident(conn); | |
3444 | ||
ba13ccd9 | 3445 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3446 | |
3447 | l2cap_send_cmd(conn, conn->info_ident, | |
3448 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3449 | } | |
3450 | ||
c1360a1c | 3451 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3452 | result == L2CAP_CR_SUCCESS) { |
3453 | u8 buf[128]; | |
c1360a1c | 3454 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3455 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3456 | l2cap_build_conf_req(chan, buf), buf); |
3457 | chan->num_conf_req++; | |
e9aeb2dd GP |
3458 | } |
3459 | ||
1da177e4 LT |
3460 | return 0; |
3461 | } | |
3462 | ||
3463 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3464 | { | |
3465 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3466 | u16 scid, dcid, result, status; | |
48454079 | 3467 | struct l2cap_chan *chan; |
1da177e4 | 3468 | u8 req[128]; |
3df91ea2 | 3469 | int err; |
1da177e4 LT |
3470 | |
3471 | scid = __le16_to_cpu(rsp->scid); | |
3472 | dcid = __le16_to_cpu(rsp->dcid); | |
3473 | result = __le16_to_cpu(rsp->result); | |
3474 | status = __le16_to_cpu(rsp->status); | |
3475 | ||
1b009c98 AE |
3476 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3477 | dcid, scid, result, status); | |
1da177e4 | 3478 | |
3df91ea2 AE |
3479 | mutex_lock(&conn->chan_lock); |
3480 | ||
1da177e4 | 3481 | if (scid) { |
3df91ea2 AE |
3482 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3483 | if (!chan) { | |
3484 | err = -EFAULT; | |
3485 | goto unlock; | |
3486 | } | |
1da177e4 | 3487 | } else { |
3df91ea2 AE |
3488 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3489 | if (!chan) { | |
3490 | err = -EFAULT; | |
3491 | goto unlock; | |
3492 | } | |
1da177e4 LT |
3493 | } |
3494 | ||
3df91ea2 AE |
3495 | err = 0; |
3496 | ||
6be36555 | 3497 | l2cap_chan_lock(chan); |
48454079 | 3498 | |
1da177e4 LT |
3499 | switch (result) { |
3500 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3501 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3502 | chan->ident = 0; |
fe4128e0 | 3503 | chan->dcid = dcid; |
c1360a1c | 3504 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3505 | |
c1360a1c | 3506 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3507 | break; |
3508 | ||
1da177e4 | 3509 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3510 | l2cap_build_conf_req(chan, req), req); |
3511 | chan->num_conf_req++; | |
1da177e4 LT |
3512 | break; |
3513 | ||
3514 | case L2CAP_CR_PEND: | |
c1360a1c | 3515 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3516 | break; |
3517 | ||
3518 | default: | |
48454079 | 3519 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3520 | break; |
3521 | } | |
3522 | ||
6be36555 | 3523 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3524 | |
3525 | unlock: | |
3526 | mutex_unlock(&conn->chan_lock); | |
3527 | ||
3528 | return err; | |
1da177e4 LT |
3529 | } |
3530 | ||
47d1ec61 | 3531 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3532 | { |
3533 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3534 | * sides request it. | |
3535 | */ | |
0c1bc5c6 | 3536 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3537 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3538 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3539 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3540 | } |
3541 | ||
88219a0f | 3542 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3543 | { |
3544 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3545 | u16 dcid, flags; | |
3546 | u8 rsp[64]; | |
48454079 | 3547 | struct l2cap_chan *chan; |
3c588192 | 3548 | int len, err = 0; |
1da177e4 LT |
3549 | |
3550 | dcid = __le16_to_cpu(req->dcid); | |
3551 | flags = __le16_to_cpu(req->flags); | |
3552 | ||
3553 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3554 | ||
baa7e1fa | 3555 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3556 | if (!chan) |
1da177e4 LT |
3557 | return -ENOENT; |
3558 | ||
033b1142 | 3559 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3560 | struct l2cap_cmd_rej_cid rej; |
3561 | ||
ac73498c | 3562 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3563 | rej.scid = cpu_to_le16(chan->scid); |
3564 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3565 | |
df6bd743 GP |
3566 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3567 | sizeof(rej), &rej); | |
354f60a9 | 3568 | goto unlock; |
df6bd743 | 3569 | } |
354f60a9 | 3570 | |
5dee9e7c | 3571 | /* Reject if config buffer is too small. */ |
88219a0f | 3572 | len = cmd_len - sizeof(*req); |
7ac28817 | 3573 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3574 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3575 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3576 | L2CAP_CONF_REJECT, flags), rsp); |
3577 | goto unlock; | |
3578 | } | |
3579 | ||
3580 | /* Store config. */ | |
73ffa904 GP |
3581 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3582 | chan->conf_len += len; | |
1da177e4 | 3583 | |
59e54bd1 | 3584 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3585 | /* Incomplete config. Send empty response. */ |
3586 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3587 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3588 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3589 | goto unlock; |
3590 | } | |
3591 | ||
3592 | /* Complete config. */ | |
73ffa904 | 3593 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3594 | if (len < 0) { |
e92c8e70 | 3595 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3596 | goto unlock; |
f2fcfcd6 | 3597 | } |
1da177e4 | 3598 | |
5dee9e7c | 3599 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3600 | chan->num_conf_rsp++; |
5dee9e7c | 3601 | |
5dee9e7c | 3602 | /* Reset config buffer. */ |
73ffa904 | 3603 | chan->conf_len = 0; |
5dee9e7c | 3604 | |
c1360a1c | 3605 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3606 | goto unlock; |
3607 | ||
c1360a1c | 3608 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3609 | set_default_fcs(chan); |
fcc203c3 | 3610 | |
105bdf9e MM |
3611 | if (chan->mode == L2CAP_MODE_ERTM || |
3612 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3613 | err = l2cap_ertm_init(chan); |
3614 | ||
3615 | if (err < 0) | |
3616 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3617 | else | |
3618 | l2cap_chan_ready(chan); | |
0565c1c2 | 3619 | |
876d9484 MH |
3620 | goto unlock; |
3621 | } | |
3622 | ||
c1360a1c | 3623 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3624 | u8 buf[64]; |
1da177e4 | 3625 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3626 | l2cap_build_conf_req(chan, buf), buf); |
3627 | chan->num_conf_req++; | |
1da177e4 LT |
3628 | } |
3629 | ||
0e8b207e AE |
3630 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3631 | Conf Rsp PENDING in the code above */ | |
3632 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3633 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3634 | ||
3635 | /* check compatibility */ | |
3636 | ||
3637 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3638 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3639 | ||
3640 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3641 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3642 | L2CAP_CONF_SUCCESS, flags), rsp); |
0e8b207e AE |
3643 | } |
3644 | ||
1da177e4 | 3645 | unlock: |
6be36555 | 3646 | l2cap_chan_unlock(chan); |
3c588192 | 3647 | return err; |
1da177e4 LT |
3648 | } |
3649 | ||
3650 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3651 | { | |
3652 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3653 | u16 scid, flags, result; | |
48454079 | 3654 | struct l2cap_chan *chan; |
61386cba | 3655 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3656 | int err = 0; |
1da177e4 LT |
3657 | |
3658 | scid = __le16_to_cpu(rsp->scid); | |
3659 | flags = __le16_to_cpu(rsp->flags); | |
3660 | result = __le16_to_cpu(rsp->result); | |
3661 | ||
61386cba AE |
3662 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3663 | result, len); | |
1da177e4 | 3664 | |
baa7e1fa | 3665 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3666 | if (!chan) |
1da177e4 LT |
3667 | return 0; |
3668 | ||
3669 | switch (result) { | |
3670 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3671 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3672 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3673 | break; |
3674 | ||
0e8b207e AE |
3675 | case L2CAP_CONF_PENDING: |
3676 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3677 | ||
3678 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3679 | char buf[64]; | |
3680 | ||
3681 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3682 | buf, &result); | |
3683 | if (len < 0) { | |
3684 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3685 | goto done; | |
3686 | } | |
3687 | ||
3688 | /* check compatibility */ | |
3689 | ||
3690 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3691 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3692 | ||
3693 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3694 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3695 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3696 | } | |
3697 | goto done; | |
3698 | ||
1da177e4 | 3699 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3700 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3701 | char req[64]; |
3702 | ||
c2c77ec8 | 3703 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3704 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3705 | goto done; |
3706 | } | |
3707 | ||
f2fcfcd6 GP |
3708 | /* throw out any old stored conf requests */ |
3709 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3710 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3711 | req, &result); | |
f2fcfcd6 | 3712 | if (len < 0) { |
e92c8e70 | 3713 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3714 | goto done; |
3715 | } | |
3716 | ||
3717 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3718 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3719 | chan->num_conf_req++; |
f2fcfcd6 GP |
3720 | if (result != L2CAP_CONF_SUCCESS) |
3721 | goto done; | |
3722 | break; | |
1da177e4 LT |
3723 | } |
3724 | ||
8e87d142 | 3725 | default: |
6be36555 | 3726 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3727 | |
ba13ccd9 | 3728 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3729 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3730 | goto done; |
3731 | } | |
3732 | ||
59e54bd1 | 3733 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3734 | goto done; |
3735 | ||
c1360a1c | 3736 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3737 | |
c1360a1c | 3738 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3739 | set_default_fcs(chan); |
fcc203c3 | 3740 | |
105bdf9e MM |
3741 | if (chan->mode == L2CAP_MODE_ERTM || |
3742 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3743 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3744 | |
3c588192 MM |
3745 | if (err < 0) |
3746 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3747 | else | |
3748 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3749 | } |
3750 | ||
3751 | done: | |
6be36555 | 3752 | l2cap_chan_unlock(chan); |
3c588192 | 3753 | return err; |
1da177e4 LT |
3754 | } |
3755 | ||
3756 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3757 | { | |
3758 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3759 | struct l2cap_disconn_rsp rsp; | |
3760 | u16 dcid, scid; | |
48454079 | 3761 | struct l2cap_chan *chan; |
1da177e4 LT |
3762 | struct sock *sk; |
3763 | ||
3764 | scid = __le16_to_cpu(req->scid); | |
3765 | dcid = __le16_to_cpu(req->dcid); | |
3766 | ||
3767 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3768 | ||
3df91ea2 AE |
3769 | mutex_lock(&conn->chan_lock); |
3770 | ||
3771 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3772 | if (!chan) { | |
3773 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3774 | return 0; |
3df91ea2 | 3775 | } |
1da177e4 | 3776 | |
6be36555 AE |
3777 | l2cap_chan_lock(chan); |
3778 | ||
48454079 GP |
3779 | sk = chan->sk; |
3780 | ||
fe4128e0 GP |
3781 | rsp.dcid = cpu_to_le16(chan->scid); |
3782 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3783 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3784 | ||
6be36555 | 3785 | lock_sock(sk); |
1da177e4 | 3786 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3787 | release_sock(sk); |
1da177e4 | 3788 | |
61d6ef3e | 3789 | l2cap_chan_hold(chan); |
48454079 | 3790 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3791 | |
3792 | l2cap_chan_unlock(chan); | |
1da177e4 | 3793 | |
80b98027 | 3794 | chan->ops->close(chan); |
61d6ef3e | 3795 | l2cap_chan_put(chan); |
3df91ea2 AE |
3796 | |
3797 | mutex_unlock(&conn->chan_lock); | |
3798 | ||
1da177e4 LT |
3799 | return 0; |
3800 | } | |
3801 | ||
3802 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3803 | { | |
3804 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3805 | u16 dcid, scid; | |
48454079 | 3806 | struct l2cap_chan *chan; |
1da177e4 LT |
3807 | |
3808 | scid = __le16_to_cpu(rsp->scid); | |
3809 | dcid = __le16_to_cpu(rsp->dcid); | |
3810 | ||
3811 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3812 | ||
3df91ea2 AE |
3813 | mutex_lock(&conn->chan_lock); |
3814 | ||
3815 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3816 | if (!chan) { | |
3817 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3818 | return 0; |
3df91ea2 | 3819 | } |
1da177e4 | 3820 | |
6be36555 | 3821 | l2cap_chan_lock(chan); |
48454079 | 3822 | |
61d6ef3e | 3823 | l2cap_chan_hold(chan); |
48454079 | 3824 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3825 | |
3826 | l2cap_chan_unlock(chan); | |
1da177e4 | 3827 | |
80b98027 | 3828 | chan->ops->close(chan); |
61d6ef3e | 3829 | l2cap_chan_put(chan); |
3df91ea2 AE |
3830 | |
3831 | mutex_unlock(&conn->chan_lock); | |
3832 | ||
1da177e4 LT |
3833 | return 0; |
3834 | } | |
3835 | ||
3836 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3837 | { | |
3838 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3839 | u16 type; |
3840 | ||
3841 | type = __le16_to_cpu(req->type); | |
3842 | ||
3843 | BT_DBG("type 0x%4.4x", type); | |
3844 | ||
f0709e03 MH |
3845 | if (type == L2CAP_IT_FEAT_MASK) { |
3846 | u8 buf[8]; | |
44dd46de | 3847 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3848 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3849 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3850 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3851 | if (!disable_ertm) |
fcc203c3 GP |
3852 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3853 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3854 | if (enable_hs) |
6327eb98 AE |
3855 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3856 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3857 | |
1b7bf4ed | 3858 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3859 | l2cap_send_cmd(conn, cmd->ident, |
3860 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3861 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3862 | u8 buf[12]; | |
3863 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3864 | |
3865 | if (enable_hs) | |
3866 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3867 | else | |
3868 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3869 | ||
ac73498c AE |
3870 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3871 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3872 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3873 | l2cap_send_cmd(conn, cmd->ident, |
3874 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3875 | } else { |
3876 | struct l2cap_info_rsp rsp; | |
3877 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3878 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3879 | l2cap_send_cmd(conn, cmd->ident, |
3880 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3881 | } | |
1da177e4 LT |
3882 | |
3883 | return 0; | |
3884 | } | |
3885 | ||
3886 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3887 | { | |
3888 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3889 | u16 type, result; | |
3890 | ||
3891 | type = __le16_to_cpu(rsp->type); | |
3892 | result = __le16_to_cpu(rsp->result); | |
3893 | ||
3894 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3895 | ||
e90165be AE |
3896 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3897 | if (cmd->ident != conn->info_ident || | |
3898 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3899 | return 0; | |
3900 | ||
17cd3f37 | 3901 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3902 | |
adb08ede VT |
3903 | if (result != L2CAP_IR_SUCCESS) { |
3904 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3905 | conn->info_ident = 0; | |
3906 | ||
3907 | l2cap_conn_start(conn); | |
3908 | ||
3909 | return 0; | |
3910 | } | |
3911 | ||
978c93b9 AE |
3912 | switch (type) { |
3913 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3914 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3915 | |
47ec1dcd | 3916 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3917 | struct l2cap_info_req req; |
ac73498c | 3918 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3919 | |
3920 | conn->info_ident = l2cap_get_ident(conn); | |
3921 | ||
3922 | l2cap_send_cmd(conn, conn->info_ident, | |
3923 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3924 | } else { | |
3925 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3926 | conn->info_ident = 0; | |
3927 | ||
3928 | l2cap_conn_start(conn); | |
3929 | } | |
978c93b9 AE |
3930 | break; |
3931 | ||
3932 | case L2CAP_IT_FIXED_CHAN: | |
3933 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3934 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3935 | conn->info_ident = 0; |
984947dc MH |
3936 | |
3937 | l2cap_conn_start(conn); | |
978c93b9 | 3938 | break; |
984947dc | 3939 | } |
4e8402a3 | 3940 | |
1da177e4 LT |
3941 | return 0; |
3942 | } | |
3943 | ||
f94ff6ff MM |
3944 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3945 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3946 | void *data) | |
3947 | { | |
3948 | struct l2cap_create_chan_req *req = data; | |
3949 | struct l2cap_create_chan_rsp rsp; | |
3950 | u16 psm, scid; | |
3951 | ||
3952 | if (cmd_len != sizeof(*req)) | |
3953 | return -EPROTO; | |
3954 | ||
3955 | if (!enable_hs) | |
3956 | return -EINVAL; | |
3957 | ||
3958 | psm = le16_to_cpu(req->psm); | |
3959 | scid = le16_to_cpu(req->scid); | |
3960 | ||
ad0ac6ca | 3961 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff MM |
3962 | |
3963 | /* Placeholder: Always reject */ | |
3964 | rsp.dcid = 0; | |
3965 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3966 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3967 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3968 | |
3969 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3970 | sizeof(rsp), &rsp); | |
3971 | ||
3972 | return 0; | |
3973 | } | |
3974 | ||
3975 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3976 | struct l2cap_cmd_hdr *cmd, void *data) | |
3977 | { | |
3978 | BT_DBG("conn %p", conn); | |
3979 | ||
3980 | return l2cap_connect_rsp(conn, cmd, data); | |
3981 | } | |
3982 | ||
8d5a04a1 | 3983 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 3984 | u16 icid, u16 result) |
8d5a04a1 MM |
3985 | { |
3986 | struct l2cap_move_chan_rsp rsp; | |
3987 | ||
ad0ac6ca | 3988 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
3989 | |
3990 | rsp.icid = cpu_to_le16(icid); | |
3991 | rsp.result = cpu_to_le16(result); | |
3992 | ||
3993 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3994 | } | |
3995 | ||
3996 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
3997 | struct l2cap_chan *chan, |
3998 | u16 icid, u16 result) | |
8d5a04a1 MM |
3999 | { |
4000 | struct l2cap_move_chan_cfm cfm; | |
4001 | u8 ident; | |
4002 | ||
ad0ac6ca | 4003 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4004 | |
4005 | ident = l2cap_get_ident(conn); | |
4006 | if (chan) | |
4007 | chan->ident = ident; | |
4008 | ||
4009 | cfm.icid = cpu_to_le16(icid); | |
4010 | cfm.result = cpu_to_le16(result); | |
4011 | ||
4012 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4013 | } | |
4014 | ||
4015 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4016 | u16 icid) |
8d5a04a1 MM |
4017 | { |
4018 | struct l2cap_move_chan_cfm_rsp rsp; | |
4019 | ||
ad0ac6ca | 4020 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4021 | |
4022 | rsp.icid = cpu_to_le16(icid); | |
4023 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4024 | } | |
4025 | ||
4026 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4027 | struct l2cap_cmd_hdr *cmd, |
4028 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4029 | { |
4030 | struct l2cap_move_chan_req *req = data; | |
4031 | u16 icid = 0; | |
4032 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4033 | ||
4034 | if (cmd_len != sizeof(*req)) | |
4035 | return -EPROTO; | |
4036 | ||
4037 | icid = le16_to_cpu(req->icid); | |
4038 | ||
ad0ac6ca | 4039 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4040 | |
4041 | if (!enable_hs) | |
4042 | return -EINVAL; | |
4043 | ||
4044 | /* Placeholder: Always refuse */ | |
4045 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4046 | ||
4047 | return 0; | |
4048 | } | |
4049 | ||
4050 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4051 | struct l2cap_cmd_hdr *cmd, |
4052 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4053 | { |
4054 | struct l2cap_move_chan_rsp *rsp = data; | |
4055 | u16 icid, result; | |
4056 | ||
4057 | if (cmd_len != sizeof(*rsp)) | |
4058 | return -EPROTO; | |
4059 | ||
4060 | icid = le16_to_cpu(rsp->icid); | |
4061 | result = le16_to_cpu(rsp->result); | |
4062 | ||
ad0ac6ca | 4063 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4064 | |
4065 | /* Placeholder: Always unconfirmed */ | |
4066 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4067 | ||
4068 | return 0; | |
4069 | } | |
4070 | ||
4071 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4072 | struct l2cap_cmd_hdr *cmd, |
4073 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4074 | { |
4075 | struct l2cap_move_chan_cfm *cfm = data; | |
4076 | u16 icid, result; | |
4077 | ||
4078 | if (cmd_len != sizeof(*cfm)) | |
4079 | return -EPROTO; | |
4080 | ||
4081 | icid = le16_to_cpu(cfm->icid); | |
4082 | result = le16_to_cpu(cfm->result); | |
4083 | ||
ad0ac6ca | 4084 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4085 | |
4086 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4087 | ||
4088 | return 0; | |
4089 | } | |
4090 | ||
4091 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4092 | struct l2cap_cmd_hdr *cmd, |
4093 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4094 | { |
4095 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4096 | u16 icid; | |
4097 | ||
4098 | if (cmd_len != sizeof(*rsp)) | |
4099 | return -EPROTO; | |
4100 | ||
4101 | icid = le16_to_cpu(rsp->icid); | |
4102 | ||
ad0ac6ca | 4103 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4104 | |
4105 | return 0; | |
4106 | } | |
4107 | ||
e2174ca4 | 4108 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4109 | u16 to_multiplier) |
4110 | { | |
4111 | u16 max_latency; | |
4112 | ||
4113 | if (min > max || min < 6 || max > 3200) | |
4114 | return -EINVAL; | |
4115 | ||
4116 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4117 | return -EINVAL; | |
4118 | ||
4119 | if (max >= to_multiplier * 8) | |
4120 | return -EINVAL; | |
4121 | ||
4122 | max_latency = (to_multiplier * 8 / max) - 1; | |
4123 | if (latency > 499 || latency > max_latency) | |
4124 | return -EINVAL; | |
4125 | ||
4126 | return 0; | |
4127 | } | |
4128 | ||
4129 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4130 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4131 | { | |
4132 | struct hci_conn *hcon = conn->hcon; | |
4133 | struct l2cap_conn_param_update_req *req; | |
4134 | struct l2cap_conn_param_update_rsp rsp; | |
4135 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4136 | int err; |
de73115a CT |
4137 | |
4138 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4139 | return -EINVAL; | |
4140 | ||
4141 | cmd_len = __le16_to_cpu(cmd->len); | |
4142 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4143 | return -EPROTO; | |
4144 | ||
4145 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4146 | min = __le16_to_cpu(req->min); |
4147 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4148 | latency = __le16_to_cpu(req->latency); |
4149 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4150 | ||
4151 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4152 | min, max, latency, to_multiplier); | |
4153 | ||
4154 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4155 | |
4156 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4157 | if (err) | |
ac73498c | 4158 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4159 | else |
ac73498c | 4160 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4161 | |
4162 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4163 | sizeof(rsp), &rsp); | |
4164 | ||
2ce603eb CT |
4165 | if (!err) |
4166 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4167 | ||
de73115a CT |
4168 | return 0; |
4169 | } | |
4170 | ||
3300d9a9 CT |
4171 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4172 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4173 | { | |
4174 | int err = 0; | |
4175 | ||
4176 | switch (cmd->code) { | |
4177 | case L2CAP_COMMAND_REJ: | |
4178 | l2cap_command_rej(conn, cmd, data); | |
4179 | break; | |
4180 | ||
4181 | case L2CAP_CONN_REQ: | |
4182 | err = l2cap_connect_req(conn, cmd, data); | |
4183 | break; | |
4184 | ||
4185 | case L2CAP_CONN_RSP: | |
4186 | err = l2cap_connect_rsp(conn, cmd, data); | |
4187 | break; | |
4188 | ||
4189 | case L2CAP_CONF_REQ: | |
4190 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4191 | break; | |
4192 | ||
4193 | case L2CAP_CONF_RSP: | |
4194 | err = l2cap_config_rsp(conn, cmd, data); | |
4195 | break; | |
4196 | ||
4197 | case L2CAP_DISCONN_REQ: | |
4198 | err = l2cap_disconnect_req(conn, cmd, data); | |
4199 | break; | |
4200 | ||
4201 | case L2CAP_DISCONN_RSP: | |
4202 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4203 | break; | |
4204 | ||
4205 | case L2CAP_ECHO_REQ: | |
4206 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4207 | break; | |
4208 | ||
4209 | case L2CAP_ECHO_RSP: | |
4210 | break; | |
4211 | ||
4212 | case L2CAP_INFO_REQ: | |
4213 | err = l2cap_information_req(conn, cmd, data); | |
4214 | break; | |
4215 | ||
4216 | case L2CAP_INFO_RSP: | |
4217 | err = l2cap_information_rsp(conn, cmd, data); | |
4218 | break; | |
4219 | ||
f94ff6ff MM |
4220 | case L2CAP_CREATE_CHAN_REQ: |
4221 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4222 | break; | |
4223 | ||
4224 | case L2CAP_CREATE_CHAN_RSP: | |
4225 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4226 | break; | |
4227 | ||
8d5a04a1 MM |
4228 | case L2CAP_MOVE_CHAN_REQ: |
4229 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4230 | break; | |
4231 | ||
4232 | case L2CAP_MOVE_CHAN_RSP: | |
4233 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4234 | break; | |
4235 | ||
4236 | case L2CAP_MOVE_CHAN_CFM: | |
4237 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4238 | break; | |
4239 | ||
4240 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4241 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4242 | break; | |
4243 | ||
3300d9a9 CT |
4244 | default: |
4245 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4246 | err = -EINVAL; | |
4247 | break; | |
4248 | } | |
4249 | ||
4250 | return err; | |
4251 | } | |
4252 | ||
4253 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4254 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4255 | { | |
4256 | switch (cmd->code) { | |
4257 | case L2CAP_COMMAND_REJ: | |
4258 | return 0; | |
4259 | ||
4260 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4261 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4262 | |
4263 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4264 | return 0; | |
4265 | ||
4266 | default: | |
4267 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4268 | return -EINVAL; | |
4269 | } | |
4270 | } | |
4271 | ||
4272 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4273 | struct sk_buff *skb) | |
1da177e4 LT |
4274 | { |
4275 | u8 *data = skb->data; | |
4276 | int len = skb->len; | |
4277 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4278 | int err; |
1da177e4 LT |
4279 | |
4280 | l2cap_raw_recv(conn, skb); | |
4281 | ||
4282 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4283 | u16 cmd_len; |
1da177e4 LT |
4284 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4285 | data += L2CAP_CMD_HDR_SIZE; | |
4286 | len -= L2CAP_CMD_HDR_SIZE; | |
4287 | ||
88219a0f | 4288 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4289 | |
88219a0f | 4290 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4291 | |
88219a0f | 4292 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4293 | BT_DBG("corrupted command"); |
4294 | break; | |
4295 | } | |
4296 | ||
3300d9a9 CT |
4297 | if (conn->hcon->type == LE_LINK) |
4298 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4299 | else | |
4300 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4301 | |
4302 | if (err) { | |
e2fd318e | 4303 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4304 | |
4305 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4306 | |
4307 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4308 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4309 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4310 | } | |
4311 | ||
88219a0f AV |
4312 | data += cmd_len; |
4313 | len -= cmd_len; | |
1da177e4 LT |
4314 | } |
4315 | ||
4316 | kfree_skb(skb); | |
4317 | } | |
4318 | ||
47d1ec61 | 4319 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4320 | { |
4321 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4322 | int hdr_size; |
4323 | ||
4324 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4325 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4326 | else | |
4327 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4328 | |
47d1ec61 | 4329 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4330 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4331 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4332 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4333 | ||
4334 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4335 | return -EBADMSG; |
fcc203c3 GP |
4336 | } |
4337 | return 0; | |
4338 | } | |
4339 | ||
6ea00485 | 4340 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4341 | { |
e31f7633 | 4342 | struct l2cap_ctrl control; |
d5392c8f | 4343 | |
e31f7633 | 4344 | BT_DBG("chan %p", chan); |
d5392c8f | 4345 | |
e31f7633 MM |
4346 | memset(&control, 0, sizeof(control)); |
4347 | control.sframe = 1; | |
4348 | control.final = 1; | |
4349 | control.reqseq = chan->buffer_seq; | |
4350 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4351 | |
e2ab4353 | 4352 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4353 | control.super = L2CAP_SUPER_RNR; |
4354 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4355 | } |
4356 | ||
e31f7633 MM |
4357 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4358 | chan->unacked_frames > 0) | |
4359 | __set_retrans_timer(chan); | |
d5392c8f | 4360 | |
e31f7633 | 4361 | /* Send pending iframes */ |
525cd185 | 4362 | l2cap_ertm_send(chan); |
d5392c8f | 4363 | |
e2ab4353 | 4364 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4365 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4366 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4367 | * send it now. | |
4368 | */ | |
4369 | control.super = L2CAP_SUPER_RR; | |
4370 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4371 | } |
4372 | } | |
4373 | ||
84084a31 MM |
4374 | static void append_skb_frag(struct sk_buff *skb, |
4375 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4376 | { |
84084a31 MM |
4377 | /* skb->len reflects data in skb as well as all fragments |
4378 | * skb->data_len reflects only data in fragments | |
4379 | */ | |
4380 | if (!skb_has_frag_list(skb)) | |
4381 | skb_shinfo(skb)->frag_list = new_frag; | |
4382 | ||
4383 | new_frag->next = NULL; | |
4384 | ||
4385 | (*last_frag)->next = new_frag; | |
4386 | *last_frag = new_frag; | |
4387 | ||
4388 | skb->len += new_frag->len; | |
4389 | skb->data_len += new_frag->len; | |
4390 | skb->truesize += new_frag->truesize; | |
4391 | } | |
4392 | ||
4b51dae9 MM |
4393 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4394 | struct l2cap_ctrl *control) | |
84084a31 MM |
4395 | { |
4396 | int err = -EINVAL; | |
18778a63 | 4397 | |
4b51dae9 | 4398 | switch (control->sar) { |
7e0ef6ee | 4399 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4400 | if (chan->sdu) |
4401 | break; | |
18778a63 | 4402 | |
80b98027 | 4403 | err = chan->ops->recv(chan, skb); |
84084a31 | 4404 | break; |
18778a63 | 4405 | |
7e0ef6ee | 4406 | case L2CAP_SAR_START: |
84084a31 MM |
4407 | if (chan->sdu) |
4408 | break; | |
18778a63 | 4409 | |
6f61fd47 | 4410 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4411 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4412 | |
84084a31 MM |
4413 | if (chan->sdu_len > chan->imtu) { |
4414 | err = -EMSGSIZE; | |
4415 | break; | |
4416 | } | |
1890d36b | 4417 | |
84084a31 MM |
4418 | if (skb->len >= chan->sdu_len) |
4419 | break; | |
18778a63 | 4420 | |
84084a31 MM |
4421 | chan->sdu = skb; |
4422 | chan->sdu_last_frag = skb; | |
18778a63 | 4423 | |
84084a31 MM |
4424 | skb = NULL; |
4425 | err = 0; | |
18778a63 GP |
4426 | break; |
4427 | ||
7e0ef6ee | 4428 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4429 | if (!chan->sdu) |
84084a31 | 4430 | break; |
18778a63 | 4431 | |
84084a31 MM |
4432 | append_skb_frag(chan->sdu, skb, |
4433 | &chan->sdu_last_frag); | |
4434 | skb = NULL; | |
18778a63 | 4435 | |
84084a31 MM |
4436 | if (chan->sdu->len >= chan->sdu_len) |
4437 | break; | |
4178ba46 | 4438 | |
84084a31 | 4439 | err = 0; |
18778a63 GP |
4440 | break; |
4441 | ||
7e0ef6ee | 4442 | case L2CAP_SAR_END: |
6f61fd47 | 4443 | if (!chan->sdu) |
84084a31 | 4444 | break; |
18778a63 | 4445 | |
84084a31 MM |
4446 | append_skb_frag(chan->sdu, skb, |
4447 | &chan->sdu_last_frag); | |
4448 | skb = NULL; | |
4178ba46 | 4449 | |
84084a31 MM |
4450 | if (chan->sdu->len != chan->sdu_len) |
4451 | break; | |
18778a63 | 4452 | |
80b98027 | 4453 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4454 | |
84084a31 MM |
4455 | if (!err) { |
4456 | /* Reassembly complete */ | |
4457 | chan->sdu = NULL; | |
4458 | chan->sdu_last_frag = NULL; | |
4459 | chan->sdu_len = 0; | |
1890d36b | 4460 | } |
18778a63 GP |
4461 | break; |
4462 | } | |
4463 | ||
84084a31 MM |
4464 | if (err) { |
4465 | kfree_skb(skb); | |
4466 | kfree_skb(chan->sdu); | |
4467 | chan->sdu = NULL; | |
4468 | chan->sdu_last_frag = NULL; | |
4469 | chan->sdu_len = 0; | |
4470 | } | |
18778a63 | 4471 | |
84084a31 | 4472 | return err; |
18778a63 GP |
4473 | } |
4474 | ||
61aa4f5b | 4475 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4476 | { |
61aa4f5b | 4477 | u8 event; |
712132eb | 4478 | |
61aa4f5b MM |
4479 | if (chan->mode != L2CAP_MODE_ERTM) |
4480 | return; | |
712132eb | 4481 | |
61aa4f5b | 4482 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4483 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4484 | } |
4485 | ||
d2a7ac5d MM |
4486 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4487 | { | |
63838725 MM |
4488 | int err = 0; |
4489 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4490 | * until a gap is encountered. | |
4491 | */ | |
4492 | ||
4493 | BT_DBG("chan %p", chan); | |
4494 | ||
4495 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4496 | struct sk_buff *skb; | |
4497 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4498 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4499 | ||
4500 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4501 | ||
4502 | if (!skb) | |
4503 | break; | |
4504 | ||
4505 | skb_unlink(skb, &chan->srej_q); | |
4506 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4507 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4508 | if (err) | |
4509 | break; | |
4510 | } | |
4511 | ||
4512 | if (skb_queue_empty(&chan->srej_q)) { | |
4513 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4514 | l2cap_send_ack(chan); | |
4515 | } | |
4516 | ||
4517 | return err; | |
d2a7ac5d MM |
4518 | } |
4519 | ||
4520 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4521 | struct l2cap_ctrl *control) | |
4522 | { | |
f80842a8 MM |
4523 | struct sk_buff *skb; |
4524 | ||
4525 | BT_DBG("chan %p, control %p", chan, control); | |
4526 | ||
4527 | if (control->reqseq == chan->next_tx_seq) { | |
4528 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4529 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4530 | return; | |
4531 | } | |
4532 | ||
4533 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4534 | ||
4535 | if (skb == NULL) { | |
4536 | BT_DBG("Seq %d not available for retransmission", | |
4537 | control->reqseq); | |
4538 | return; | |
4539 | } | |
4540 | ||
4541 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4542 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4543 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4544 | return; | |
4545 | } | |
4546 | ||
4547 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4548 | ||
4549 | if (control->poll) { | |
4550 | l2cap_pass_to_tx(chan, control); | |
4551 | ||
4552 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4553 | l2cap_retransmit(chan, control); | |
4554 | l2cap_ertm_send(chan); | |
4555 | ||
4556 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4557 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4558 | chan->srej_save_reqseq = control->reqseq; | |
4559 | } | |
4560 | } else { | |
4561 | l2cap_pass_to_tx_fbit(chan, control); | |
4562 | ||
4563 | if (control->final) { | |
4564 | if (chan->srej_save_reqseq != control->reqseq || | |
4565 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4566 | &chan->conn_state)) | |
4567 | l2cap_retransmit(chan, control); | |
4568 | } else { | |
4569 | l2cap_retransmit(chan, control); | |
4570 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4571 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4572 | chan->srej_save_reqseq = control->reqseq; | |
4573 | } | |
4574 | } | |
4575 | } | |
d2a7ac5d MM |
4576 | } |
4577 | ||
4578 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4579 | struct l2cap_ctrl *control) | |
4580 | { | |
fcd289df MM |
4581 | struct sk_buff *skb; |
4582 | ||
4583 | BT_DBG("chan %p, control %p", chan, control); | |
4584 | ||
4585 | if (control->reqseq == chan->next_tx_seq) { | |
4586 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4587 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4588 | return; | |
4589 | } | |
4590 | ||
4591 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4592 | ||
4593 | if (chan->max_tx && skb && | |
4594 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4595 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4596 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4597 | return; | |
4598 | } | |
4599 | ||
4600 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4601 | ||
4602 | l2cap_pass_to_tx(chan, control); | |
4603 | ||
4604 | if (control->final) { | |
4605 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4606 | l2cap_retransmit_all(chan, control); | |
4607 | } else { | |
4608 | l2cap_retransmit_all(chan, control); | |
4609 | l2cap_ertm_send(chan); | |
4610 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4611 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4612 | } | |
d2a7ac5d MM |
4613 | } |
4614 | ||
4b51dae9 MM |
4615 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4616 | { | |
4617 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4618 | ||
4619 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4620 | chan->expected_tx_seq); | |
4621 | ||
4622 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4623 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4624 | chan->tx_win) { | |
4625 | /* See notes below regarding "double poll" and | |
4626 | * invalid packets. | |
4627 | */ | |
4628 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4629 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4630 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4631 | } else { | |
4632 | BT_DBG("Invalid - in window after SREJ sent"); | |
4633 | return L2CAP_TXSEQ_INVALID; | |
4634 | } | |
4635 | } | |
4636 | ||
4637 | if (chan->srej_list.head == txseq) { | |
4638 | BT_DBG("Expected SREJ"); | |
4639 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4640 | } | |
4641 | ||
4642 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4643 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4644 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4645 | } | |
4646 | ||
4647 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4648 | BT_DBG("Unexpected SREJ - not requested"); | |
4649 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4650 | } | |
4651 | } | |
4652 | ||
4653 | if (chan->expected_tx_seq == txseq) { | |
4654 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4655 | chan->tx_win) { | |
4656 | BT_DBG("Invalid - txseq outside tx window"); | |
4657 | return L2CAP_TXSEQ_INVALID; | |
4658 | } else { | |
4659 | BT_DBG("Expected"); | |
4660 | return L2CAP_TXSEQ_EXPECTED; | |
4661 | } | |
4662 | } | |
4663 | ||
4664 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4665 | __seq_offset(chan, chan->expected_tx_seq, | |
4666 | chan->last_acked_seq)){ | |
4667 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4668 | return L2CAP_TXSEQ_DUPLICATE; | |
4669 | } | |
4670 | ||
4671 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4672 | /* A source of invalid packets is a "double poll" condition, | |
4673 | * where delays cause us to send multiple poll packets. If | |
4674 | * the remote stack receives and processes both polls, | |
4675 | * sequence numbers can wrap around in such a way that a | |
4676 | * resent frame has a sequence number that looks like new data | |
4677 | * with a sequence gap. This would trigger an erroneous SREJ | |
4678 | * request. | |
4679 | * | |
4680 | * Fortunately, this is impossible with a tx window that's | |
4681 | * less than half of the maximum sequence number, which allows | |
4682 | * invalid frames to be safely ignored. | |
4683 | * | |
4684 | * With tx window sizes greater than half of the tx window | |
4685 | * maximum, the frame is invalid and cannot be ignored. This | |
4686 | * causes a disconnect. | |
4687 | */ | |
4688 | ||
4689 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4690 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4691 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4692 | } else { | |
4693 | BT_DBG("Invalid - txseq outside tx window"); | |
4694 | return L2CAP_TXSEQ_INVALID; | |
4695 | } | |
4696 | } else { | |
4697 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4698 | return L2CAP_TXSEQ_UNEXPECTED; | |
4699 | } | |
4700 | } | |
4701 | ||
d2a7ac5d MM |
4702 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4703 | struct l2cap_ctrl *control, | |
4704 | struct sk_buff *skb, u8 event) | |
4705 | { | |
4706 | int err = 0; | |
4707 | bool skb_in_use = 0; | |
4708 | ||
4709 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4710 | event); | |
4711 | ||
4712 | switch (event) { | |
4713 | case L2CAP_EV_RECV_IFRAME: | |
4714 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4715 | case L2CAP_TXSEQ_EXPECTED: | |
4716 | l2cap_pass_to_tx(chan, control); | |
4717 | ||
4718 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4719 | BT_DBG("Busy, discarding expected seq %d", | |
4720 | control->txseq); | |
4721 | break; | |
4722 | } | |
4723 | ||
4724 | chan->expected_tx_seq = __next_seq(chan, | |
4725 | control->txseq); | |
4726 | ||
4727 | chan->buffer_seq = chan->expected_tx_seq; | |
4728 | skb_in_use = 1; | |
4729 | ||
4730 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4731 | if (err) | |
4732 | break; | |
4733 | ||
4734 | if (control->final) { | |
4735 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4736 | &chan->conn_state)) { | |
4737 | control->final = 0; | |
4738 | l2cap_retransmit_all(chan, control); | |
4739 | l2cap_ertm_send(chan); | |
4740 | } | |
4741 | } | |
4742 | ||
4743 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4744 | l2cap_send_ack(chan); | |
4745 | break; | |
4746 | case L2CAP_TXSEQ_UNEXPECTED: | |
4747 | l2cap_pass_to_tx(chan, control); | |
4748 | ||
4749 | /* Can't issue SREJ frames in the local busy state. | |
4750 | * Drop this frame, it will be seen as missing | |
4751 | * when local busy is exited. | |
4752 | */ | |
4753 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4754 | BT_DBG("Busy, discarding unexpected seq %d", | |
4755 | control->txseq); | |
4756 | break; | |
4757 | } | |
4758 | ||
4759 | /* There was a gap in the sequence, so an SREJ | |
4760 | * must be sent for each missing frame. The | |
4761 | * current frame is stored for later use. | |
4762 | */ | |
4763 | skb_queue_tail(&chan->srej_q, skb); | |
4764 | skb_in_use = 1; | |
4765 | BT_DBG("Queued %p (queue len %d)", skb, | |
4766 | skb_queue_len(&chan->srej_q)); | |
4767 | ||
4768 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4769 | l2cap_seq_list_clear(&chan->srej_list); | |
4770 | l2cap_send_srej(chan, control->txseq); | |
4771 | ||
4772 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4773 | break; | |
4774 | case L2CAP_TXSEQ_DUPLICATE: | |
4775 | l2cap_pass_to_tx(chan, control); | |
4776 | break; | |
4777 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4778 | break; | |
4779 | case L2CAP_TXSEQ_INVALID: | |
4780 | default: | |
4781 | l2cap_send_disconn_req(chan->conn, chan, | |
4782 | ECONNRESET); | |
4783 | break; | |
4784 | } | |
4785 | break; | |
4786 | case L2CAP_EV_RECV_RR: | |
4787 | l2cap_pass_to_tx(chan, control); | |
4788 | if (control->final) { | |
4789 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4790 | ||
4791 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4792 | &chan->conn_state)) { | |
4793 | control->final = 0; | |
4794 | l2cap_retransmit_all(chan, control); | |
4795 | } | |
4796 | ||
4797 | l2cap_ertm_send(chan); | |
4798 | } else if (control->poll) { | |
4799 | l2cap_send_i_or_rr_or_rnr(chan); | |
4800 | } else { | |
4801 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4802 | &chan->conn_state) && | |
4803 | chan->unacked_frames) | |
4804 | __set_retrans_timer(chan); | |
4805 | ||
4806 | l2cap_ertm_send(chan); | |
4807 | } | |
4808 | break; | |
4809 | case L2CAP_EV_RECV_RNR: | |
4810 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4811 | l2cap_pass_to_tx(chan, control); | |
4812 | if (control && control->poll) { | |
4813 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4814 | l2cap_send_rr_or_rnr(chan, 0); | |
4815 | } | |
4816 | __clear_retrans_timer(chan); | |
4817 | l2cap_seq_list_clear(&chan->retrans_list); | |
4818 | break; | |
4819 | case L2CAP_EV_RECV_REJ: | |
4820 | l2cap_handle_rej(chan, control); | |
4821 | break; | |
4822 | case L2CAP_EV_RECV_SREJ: | |
4823 | l2cap_handle_srej(chan, control); | |
4824 | break; | |
4825 | default: | |
4826 | break; | |
4827 | } | |
4828 | ||
4829 | if (skb && !skb_in_use) { | |
4830 | BT_DBG("Freeing %p", skb); | |
4831 | kfree_skb(skb); | |
4832 | } | |
4833 | ||
4834 | return err; | |
4835 | } | |
4836 | ||
4837 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4838 | struct l2cap_ctrl *control, | |
4839 | struct sk_buff *skb, u8 event) | |
4840 | { | |
4841 | int err = 0; | |
4842 | u16 txseq = control->txseq; | |
4843 | bool skb_in_use = 0; | |
4844 | ||
4845 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4846 | event); | |
4847 | ||
4848 | switch (event) { | |
4849 | case L2CAP_EV_RECV_IFRAME: | |
4850 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4851 | case L2CAP_TXSEQ_EXPECTED: | |
4852 | /* Keep frame for reassembly later */ | |
4853 | l2cap_pass_to_tx(chan, control); | |
4854 | skb_queue_tail(&chan->srej_q, skb); | |
4855 | skb_in_use = 1; | |
4856 | BT_DBG("Queued %p (queue len %d)", skb, | |
4857 | skb_queue_len(&chan->srej_q)); | |
4858 | ||
4859 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4860 | break; | |
4861 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4862 | l2cap_seq_list_pop(&chan->srej_list); | |
4863 | ||
4864 | l2cap_pass_to_tx(chan, control); | |
4865 | skb_queue_tail(&chan->srej_q, skb); | |
4866 | skb_in_use = 1; | |
4867 | BT_DBG("Queued %p (queue len %d)", skb, | |
4868 | skb_queue_len(&chan->srej_q)); | |
4869 | ||
4870 | err = l2cap_rx_queued_iframes(chan); | |
4871 | if (err) | |
4872 | break; | |
4873 | ||
4874 | break; | |
4875 | case L2CAP_TXSEQ_UNEXPECTED: | |
4876 | /* Got a frame that can't be reassembled yet. | |
4877 | * Save it for later, and send SREJs to cover | |
4878 | * the missing frames. | |
4879 | */ | |
4880 | skb_queue_tail(&chan->srej_q, skb); | |
4881 | skb_in_use = 1; | |
4882 | BT_DBG("Queued %p (queue len %d)", skb, | |
4883 | skb_queue_len(&chan->srej_q)); | |
4884 | ||
4885 | l2cap_pass_to_tx(chan, control); | |
4886 | l2cap_send_srej(chan, control->txseq); | |
4887 | break; | |
4888 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4889 | /* This frame was requested with an SREJ, but | |
4890 | * some expected retransmitted frames are | |
4891 | * missing. Request retransmission of missing | |
4892 | * SREJ'd frames. | |
4893 | */ | |
4894 | skb_queue_tail(&chan->srej_q, skb); | |
4895 | skb_in_use = 1; | |
4896 | BT_DBG("Queued %p (queue len %d)", skb, | |
4897 | skb_queue_len(&chan->srej_q)); | |
4898 | ||
4899 | l2cap_pass_to_tx(chan, control); | |
4900 | l2cap_send_srej_list(chan, control->txseq); | |
4901 | break; | |
4902 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4903 | /* We've already queued this frame. Drop this copy. */ | |
4904 | l2cap_pass_to_tx(chan, control); | |
4905 | break; | |
4906 | case L2CAP_TXSEQ_DUPLICATE: | |
4907 | /* Expecting a later sequence number, so this frame | |
4908 | * was already received. Ignore it completely. | |
4909 | */ | |
4910 | break; | |
4911 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4912 | break; | |
4913 | case L2CAP_TXSEQ_INVALID: | |
4914 | default: | |
4915 | l2cap_send_disconn_req(chan->conn, chan, | |
4916 | ECONNRESET); | |
4917 | break; | |
4918 | } | |
4919 | break; | |
4920 | case L2CAP_EV_RECV_RR: | |
4921 | l2cap_pass_to_tx(chan, control); | |
4922 | if (control->final) { | |
4923 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4924 | ||
4925 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4926 | &chan->conn_state)) { | |
4927 | control->final = 0; | |
4928 | l2cap_retransmit_all(chan, control); | |
4929 | } | |
4930 | ||
4931 | l2cap_ertm_send(chan); | |
4932 | } else if (control->poll) { | |
4933 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4934 | &chan->conn_state) && | |
4935 | chan->unacked_frames) { | |
4936 | __set_retrans_timer(chan); | |
4937 | } | |
4938 | ||
4939 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4940 | l2cap_send_srej_tail(chan); | |
4941 | } else { | |
4942 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4943 | &chan->conn_state) && | |
4944 | chan->unacked_frames) | |
4945 | __set_retrans_timer(chan); | |
4946 | ||
4947 | l2cap_send_ack(chan); | |
4948 | } | |
4949 | break; | |
4950 | case L2CAP_EV_RECV_RNR: | |
4951 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4952 | l2cap_pass_to_tx(chan, control); | |
4953 | if (control->poll) { | |
4954 | l2cap_send_srej_tail(chan); | |
4955 | } else { | |
4956 | struct l2cap_ctrl rr_control; | |
4957 | memset(&rr_control, 0, sizeof(rr_control)); | |
4958 | rr_control.sframe = 1; | |
4959 | rr_control.super = L2CAP_SUPER_RR; | |
4960 | rr_control.reqseq = chan->buffer_seq; | |
4961 | l2cap_send_sframe(chan, &rr_control); | |
4962 | } | |
4963 | ||
4964 | break; | |
4965 | case L2CAP_EV_RECV_REJ: | |
4966 | l2cap_handle_rej(chan, control); | |
4967 | break; | |
4968 | case L2CAP_EV_RECV_SREJ: | |
4969 | l2cap_handle_srej(chan, control); | |
4970 | break; | |
4971 | } | |
4972 | ||
4973 | if (skb && !skb_in_use) { | |
4974 | BT_DBG("Freeing %p", skb); | |
4975 | kfree_skb(skb); | |
4976 | } | |
4977 | ||
4978 | return err; | |
4979 | } | |
4980 | ||
4981 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
4982 | { | |
4983 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
4984 | u16 unacked; | |
4985 | ||
4986 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
4987 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
4988 | } | |
4989 | ||
cec8ab6e MM |
4990 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4991 | struct sk_buff *skb, u8 event) | |
218bb9df | 4992 | { |
d2a7ac5d MM |
4993 | int err = 0; |
4994 | ||
4995 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
4996 | control, skb, event, chan->rx_state); | |
4997 | ||
4998 | if (__valid_reqseq(chan, control->reqseq)) { | |
4999 | switch (chan->rx_state) { | |
5000 | case L2CAP_RX_STATE_RECV: | |
5001 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5002 | break; | |
5003 | case L2CAP_RX_STATE_SREJ_SENT: | |
5004 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5005 | event); | |
5006 | break; | |
5007 | default: | |
5008 | /* shut it down */ | |
5009 | break; | |
5010 | } | |
5011 | } else { | |
5012 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5013 | control->reqseq, chan->next_tx_seq, | |
5014 | chan->expected_ack_seq); | |
5015 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5016 | } | |
5017 | ||
5018 | return err; | |
cec8ab6e MM |
5019 | } |
5020 | ||
5021 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5022 | struct sk_buff *skb) | |
5023 | { | |
4b51dae9 MM |
5024 | int err = 0; |
5025 | ||
5026 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5027 | chan->rx_state); | |
5028 | ||
5029 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5030 | L2CAP_TXSEQ_EXPECTED) { | |
5031 | l2cap_pass_to_tx(chan, control); | |
5032 | ||
5033 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5034 | __next_seq(chan, chan->buffer_seq)); | |
5035 | ||
5036 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5037 | ||
5038 | l2cap_reassemble_sdu(chan, skb, control); | |
5039 | } else { | |
5040 | if (chan->sdu) { | |
5041 | kfree_skb(chan->sdu); | |
5042 | chan->sdu = NULL; | |
5043 | } | |
5044 | chan->sdu_last_frag = NULL; | |
5045 | chan->sdu_len = 0; | |
5046 | ||
5047 | if (skb) { | |
5048 | BT_DBG("Freeing %p", skb); | |
5049 | kfree_skb(skb); | |
5050 | } | |
5051 | } | |
5052 | ||
5053 | chan->last_acked_seq = control->txseq; | |
5054 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5055 | ||
5056 | return err; | |
cec8ab6e MM |
5057 | } |
5058 | ||
5059 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5060 | { | |
5061 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5062 | u16 len; | |
5063 | u8 event; | |
218bb9df | 5064 | |
b76bbd66 MM |
5065 | __unpack_control(chan, skb); |
5066 | ||
218bb9df GP |
5067 | len = skb->len; |
5068 | ||
5069 | /* | |
5070 | * We can just drop the corrupted I-frame here. | |
5071 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5072 | * procedures and ask for retransmission. |
218bb9df | 5073 | */ |
47d1ec61 | 5074 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5075 | goto drop; |
5076 | ||
cec8ab6e | 5077 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5078 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5079 | |
47d1ec61 | 5080 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5081 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5082 | |
47d1ec61 | 5083 | if (len > chan->mps) { |
8c1d787b | 5084 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5085 | goto drop; |
5086 | } | |
5087 | ||
cec8ab6e MM |
5088 | if (!control->sframe) { |
5089 | int err; | |
218bb9df | 5090 | |
cec8ab6e MM |
5091 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5092 | control->sar, control->reqseq, control->final, | |
5093 | control->txseq); | |
218bb9df | 5094 | |
cec8ab6e MM |
5095 | /* Validate F-bit - F=0 always valid, F=1 only |
5096 | * valid in TX WAIT_F | |
5097 | */ | |
5098 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5099 | goto drop; |
cec8ab6e MM |
5100 | |
5101 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5102 | event = L2CAP_EV_RECV_IFRAME; | |
5103 | err = l2cap_rx(chan, control, skb, event); | |
5104 | } else { | |
5105 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5106 | } |
5107 | ||
cec8ab6e MM |
5108 | if (err) |
5109 | l2cap_send_disconn_req(chan->conn, chan, | |
5110 | ECONNRESET); | |
218bb9df | 5111 | } else { |
cec8ab6e MM |
5112 | const u8 rx_func_to_event[4] = { |
5113 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5114 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5115 | }; | |
5116 | ||
5117 | /* Only I-frames are expected in streaming mode */ | |
5118 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5119 | goto drop; | |
5120 | ||
5121 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5122 | control->reqseq, control->final, control->poll, | |
5123 | control->super); | |
5124 | ||
218bb9df GP |
5125 | if (len != 0) { |
5126 | BT_ERR("%d", len); | |
8c1d787b | 5127 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5128 | goto drop; |
5129 | } | |
5130 | ||
cec8ab6e MM |
5131 | /* Validate F and P bits */ |
5132 | if (control->final && (control->poll || | |
5133 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5134 | goto drop; | |
5135 | ||
5136 | event = rx_func_to_event[control->super]; | |
5137 | if (l2cap_rx(chan, control, skb, event)) | |
5138 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5139 | } |
5140 | ||
5141 | return 0; | |
5142 | ||
5143 | drop: | |
5144 | kfree_skb(skb); | |
5145 | return 0; | |
5146 | } | |
5147 | ||
13ca56e0 AE |
5148 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5149 | struct sk_buff *skb) | |
1da177e4 | 5150 | { |
48454079 | 5151 | struct l2cap_chan *chan; |
1da177e4 | 5152 | |
baa7e1fa | 5153 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5154 | if (!chan) { |
97e8e89d AE |
5155 | if (cid == L2CAP_CID_A2MP) { |
5156 | chan = a2mp_channel_create(conn, skb); | |
5157 | if (!chan) { | |
5158 | kfree_skb(skb); | |
13ca56e0 | 5159 | return; |
97e8e89d AE |
5160 | } |
5161 | ||
5162 | l2cap_chan_lock(chan); | |
5163 | } else { | |
5164 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5165 | /* Drop packet and return */ | |
5166 | kfree_skb(skb); | |
13ca56e0 | 5167 | return; |
97e8e89d | 5168 | } |
1da177e4 LT |
5169 | } |
5170 | ||
49208c9c | 5171 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5172 | |
89bc500e | 5173 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5174 | goto drop; |
5175 | ||
0c1bc5c6 | 5176 | switch (chan->mode) { |
1c2acffb GP |
5177 | case L2CAP_MODE_BASIC: |
5178 | /* If socket recv buffers overflows we drop data here | |
5179 | * which is *bad* because L2CAP has to be reliable. | |
5180 | * But we don't have any other choice. L2CAP doesn't | |
5181 | * provide flow control mechanism. */ | |
1da177e4 | 5182 | |
0c1bc5c6 | 5183 | if (chan->imtu < skb->len) |
1c2acffb | 5184 | goto drop; |
1da177e4 | 5185 | |
80b98027 | 5186 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5187 | goto done; |
5188 | break; | |
5189 | ||
5190 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5191 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5192 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5193 | goto done; |
5194 | ||
1c2acffb | 5195 | default: |
0c1bc5c6 | 5196 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5197 | break; |
5198 | } | |
1da177e4 LT |
5199 | |
5200 | drop: | |
5201 | kfree_skb(skb); | |
5202 | ||
5203 | done: | |
6be36555 | 5204 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5205 | } |
5206 | ||
84104b24 AE |
5207 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5208 | struct sk_buff *skb) | |
1da177e4 | 5209 | { |
23691d75 | 5210 | struct l2cap_chan *chan; |
1da177e4 | 5211 | |
c2287681 | 5212 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5213 | if (!chan) |
1da177e4 LT |
5214 | goto drop; |
5215 | ||
5b4cedaa | 5216 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5217 | |
89bc500e | 5218 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5219 | goto drop; |
5220 | ||
e13e21dc | 5221 | if (chan->imtu < skb->len) |
1da177e4 LT |
5222 | goto drop; |
5223 | ||
80b98027 | 5224 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5225 | return; |
1da177e4 LT |
5226 | |
5227 | drop: | |
5228 | kfree_skb(skb); | |
1da177e4 LT |
5229 | } |
5230 | ||
6810fca7 AE |
5231 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5232 | struct sk_buff *skb) | |
9f69bda6 | 5233 | { |
23691d75 | 5234 | struct l2cap_chan *chan; |
9f69bda6 | 5235 | |
c2287681 | 5236 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5237 | if (!chan) |
9f69bda6 GP |
5238 | goto drop; |
5239 | ||
5b4cedaa | 5240 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5241 | |
89bc500e | 5242 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5243 | goto drop; |
5244 | ||
e13e21dc | 5245 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5246 | goto drop; |
5247 | ||
80b98027 | 5248 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5249 | return; |
9f69bda6 GP |
5250 | |
5251 | drop: | |
5252 | kfree_skb(skb); | |
9f69bda6 GP |
5253 | } |
5254 | ||
1da177e4 LT |
5255 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5256 | { | |
5257 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5258 | u16 cid, len; |
5259 | __le16 psm; | |
1da177e4 LT |
5260 | |
5261 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5262 | cid = __le16_to_cpu(lh->cid); | |
5263 | len = __le16_to_cpu(lh->len); | |
5264 | ||
1c2acffb GP |
5265 | if (len != skb->len) { |
5266 | kfree_skb(skb); | |
5267 | return; | |
5268 | } | |
5269 | ||
1da177e4 LT |
5270 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5271 | ||
5272 | switch (cid) { | |
3300d9a9 | 5273 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5274 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5275 | l2cap_sig_channel(conn, skb); |
5276 | break; | |
5277 | ||
8db4dc46 | 5278 | case L2CAP_CID_CONN_LESS: |
097db76c | 5279 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5280 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5281 | l2cap_conless_channel(conn, psm, skb); |
5282 | break; | |
5283 | ||
9f69bda6 GP |
5284 | case L2CAP_CID_LE_DATA: |
5285 | l2cap_att_channel(conn, cid, skb); | |
5286 | break; | |
5287 | ||
b501d6a1 AB |
5288 | case L2CAP_CID_SMP: |
5289 | if (smp_sig_channel(conn, skb)) | |
5290 | l2cap_conn_del(conn->hcon, EACCES); | |
5291 | break; | |
5292 | ||
1da177e4 LT |
5293 | default: |
5294 | l2cap_data_channel(conn, cid, skb); | |
5295 | break; | |
5296 | } | |
5297 | } | |
5298 | ||
5299 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5300 | ||
686ebf28 | 5301 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5302 | { |
5303 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5304 | struct l2cap_chan *c; |
1da177e4 | 5305 | |
1da177e4 LT |
5306 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5307 | ||
5308 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5309 | read_lock(&chan_list_lock); |
5310 | list_for_each_entry(c, &chan_list, global_l) { | |
5311 | struct sock *sk = c->sk; | |
4343478f | 5312 | |
89bc500e | 5313 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5314 | continue; |
5315 | ||
5316 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5317 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5318 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5319 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5320 | exact++; |
2af6b9d5 MH |
5321 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5322 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5323 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5324 | lm2 |= HCI_LM_MASTER; |
5325 | } | |
1da177e4 | 5326 | } |
23691d75 | 5327 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5328 | |
5329 | return exact ? lm1 : lm2; | |
5330 | } | |
5331 | ||
686ebf28 | 5332 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5333 | { |
0139418c MH |
5334 | struct l2cap_conn *conn; |
5335 | ||
1da177e4 LT |
5336 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5337 | ||
1da177e4 | 5338 | if (!status) { |
1da177e4 LT |
5339 | conn = l2cap_conn_add(hcon, status); |
5340 | if (conn) | |
5341 | l2cap_conn_ready(conn); | |
0139418c | 5342 | } else |
e175072f | 5343 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5344 | |
5345 | return 0; | |
5346 | } | |
5347 | ||
686ebf28 | 5348 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5349 | { |
5350 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5351 | ||
5352 | BT_DBG("hcon %p", hcon); | |
5353 | ||
686ebf28 | 5354 | if (!conn) |
9f5a0d7b | 5355 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5356 | return conn->disc_reason; |
5357 | } | |
5358 | ||
686ebf28 | 5359 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5360 | { |
5361 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5362 | ||
e175072f | 5363 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5364 | return 0; |
5365 | } | |
5366 | ||
4343478f | 5367 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5368 | { |
715ec005 | 5369 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5370 | return; |
5371 | ||
f62e4323 | 5372 | if (encrypt == 0x00) { |
4343478f | 5373 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5374 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5375 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5376 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5377 | } else { |
4343478f | 5378 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5379 | __clear_chan_timer(chan); |
f62e4323 MH |
5380 | } |
5381 | } | |
5382 | ||
686ebf28 | 5383 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5384 | { |
0139418c | 5385 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5386 | struct l2cap_chan *chan; |
1da177e4 | 5387 | |
0139418c | 5388 | if (!conn) |
1da177e4 | 5389 | return 0; |
0139418c | 5390 | |
89d8b407 | 5391 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 5392 | |
160dc6ac | 5393 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5394 | if (!status && encrypt) |
5395 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5396 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5397 | } |
5398 | ||
3df91ea2 | 5399 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5400 | |
3df91ea2 | 5401 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5402 | l2cap_chan_lock(chan); |
1da177e4 | 5403 | |
89d8b407 AE |
5404 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
5405 | state_to_string(chan->state)); | |
f1cb9af5 | 5406 | |
78eb2f98 AE |
5407 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
5408 | l2cap_chan_unlock(chan); | |
5409 | continue; | |
5410 | } | |
5411 | ||
f1cb9af5 VCG |
5412 | if (chan->scid == L2CAP_CID_LE_DATA) { |
5413 | if (!status && encrypt) { | |
5414 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5415 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5416 | } |
5417 | ||
6be36555 | 5418 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5419 | continue; |
5420 | } | |
5421 | ||
c1360a1c | 5422 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5423 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5424 | continue; |
5425 | } | |
5426 | ||
89bc500e GP |
5427 | if (!status && (chan->state == BT_CONNECTED || |
5428 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5429 | struct sock *sk = chan->sk; |
5430 | ||
c5daa683 | 5431 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5432 | sk->sk_state_change(sk); |
5433 | ||
4343478f | 5434 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5435 | l2cap_chan_unlock(chan); |
9719f8af MH |
5436 | continue; |
5437 | } | |
5438 | ||
89bc500e | 5439 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5440 | if (!status) { |
9b27f350 | 5441 | l2cap_send_conn_req(chan); |
b1235d79 | 5442 | } else { |
ba13ccd9 | 5443 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5444 | } |
89bc500e | 5445 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5446 | struct sock *sk = chan->sk; |
b1235d79 | 5447 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5448 | __u16 res, stat; |
1da177e4 | 5449 | |
6be36555 AE |
5450 | lock_sock(sk); |
5451 | ||
b1235d79 | 5452 | if (!status) { |
c5daa683 GP |
5453 | if (test_bit(BT_SK_DEFER_SETUP, |
5454 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5455 | struct sock *parent = bt_sk(sk)->parent; |
5456 | res = L2CAP_CR_PEND; | |
5457 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5458 | if (parent) |
5459 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5460 | } else { |
0e587be7 | 5461 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5462 | res = L2CAP_CR_SUCCESS; |
5463 | stat = L2CAP_CS_NO_INFO; | |
5464 | } | |
b1235d79 | 5465 | } else { |
0e587be7 | 5466 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5467 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5468 | res = L2CAP_CR_SEC_BLOCK; |
5469 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5470 | } |
5471 | ||
6be36555 AE |
5472 | release_sock(sk); |
5473 | ||
fe4128e0 GP |
5474 | rsp.scid = cpu_to_le16(chan->dcid); |
5475 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5476 | rsp.result = cpu_to_le16(res); |
5477 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5478 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5479 | sizeof(rsp), &rsp); | |
2d369359 MM |
5480 | |
5481 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5482 | res == L2CAP_CR_SUCCESS) { | |
5483 | char buf[128]; | |
5484 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5485 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5486 | L2CAP_CONF_REQ, | |
5487 | l2cap_build_conf_req(chan, buf), | |
5488 | buf); | |
5489 | chan->num_conf_req++; | |
5490 | } | |
b1235d79 | 5491 | } |
1da177e4 | 5492 | |
6be36555 | 5493 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5494 | } |
5495 | ||
3df91ea2 | 5496 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5497 | |
1da177e4 LT |
5498 | return 0; |
5499 | } | |
5500 | ||
686ebf28 | 5501 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5502 | { |
5503 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5504 | ||
5a08ecce AE |
5505 | if (!conn) |
5506 | conn = l2cap_conn_add(hcon, 0); | |
5507 | ||
5508 | if (!conn) | |
1da177e4 LT |
5509 | goto drop; |
5510 | ||
5511 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5512 | ||
e702112f | 5513 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5514 | struct l2cap_hdr *hdr; |
5515 | int len; | |
5516 | ||
5517 | if (conn->rx_len) { | |
5518 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5519 | kfree_skb(conn->rx_skb); | |
5520 | conn->rx_skb = NULL; | |
5521 | conn->rx_len = 0; | |
5522 | l2cap_conn_unreliable(conn, ECOMM); | |
5523 | } | |
5524 | ||
aae7fe22 AE |
5525 | /* Start fragment always begin with Basic L2CAP header */ |
5526 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5527 | BT_ERR("Frame is too short (len %d)", skb->len); |
5528 | l2cap_conn_unreliable(conn, ECOMM); | |
5529 | goto drop; | |
5530 | } | |
5531 | ||
5532 | hdr = (struct l2cap_hdr *) skb->data; | |
5533 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5534 | ||
5535 | if (len == skb->len) { | |
5536 | /* Complete frame received */ | |
5537 | l2cap_recv_frame(conn, skb); | |
5538 | return 0; | |
5539 | } | |
5540 | ||
5541 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5542 | ||
5543 | if (skb->len > len) { | |
5544 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5545 | skb->len, len); | |
5546 | l2cap_conn_unreliable(conn, ECOMM); | |
5547 | goto drop; | |
5548 | } | |
5549 | ||
5550 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5551 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5552 | if (!conn->rx_skb) | |
1da177e4 LT |
5553 | goto drop; |
5554 | ||
d626f62b | 5555 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5556 | skb->len); |
1da177e4 LT |
5557 | conn->rx_len = len - skb->len; |
5558 | } else { | |
5559 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5560 | ||
5561 | if (!conn->rx_len) { | |
5562 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5563 | l2cap_conn_unreliable(conn, ECOMM); | |
5564 | goto drop; | |
5565 | } | |
5566 | ||
5567 | if (skb->len > conn->rx_len) { | |
5568 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5569 | skb->len, conn->rx_len); | |
5570 | kfree_skb(conn->rx_skb); | |
5571 | conn->rx_skb = NULL; | |
5572 | conn->rx_len = 0; | |
5573 | l2cap_conn_unreliable(conn, ECOMM); | |
5574 | goto drop; | |
5575 | } | |
5576 | ||
d626f62b | 5577 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5578 | skb->len); |
1da177e4 LT |
5579 | conn->rx_len -= skb->len; |
5580 | ||
5581 | if (!conn->rx_len) { | |
5582 | /* Complete frame received */ | |
5583 | l2cap_recv_frame(conn, conn->rx_skb); | |
5584 | conn->rx_skb = NULL; | |
5585 | } | |
5586 | } | |
5587 | ||
5588 | drop: | |
5589 | kfree_skb(skb); | |
5590 | return 0; | |
5591 | } | |
5592 | ||
aef7d97c | 5593 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5594 | { |
23691d75 | 5595 | struct l2cap_chan *c; |
1da177e4 | 5596 | |
333055f2 | 5597 | read_lock(&chan_list_lock); |
1da177e4 | 5598 | |
23691d75 GP |
5599 | list_for_each_entry(c, &chan_list, global_l) { |
5600 | struct sock *sk = c->sk; | |
101545f6 | 5601 | |
903d343e | 5602 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5603 | batostr(&bt_sk(sk)->src), |
5604 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5605 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5606 | c->scid, c->dcid, c->imtu, c->omtu, |
5607 | c->sec_level, c->mode); | |
61e1b4b7 | 5608 | } |
1da177e4 | 5609 | |
333055f2 | 5610 | read_unlock(&chan_list_lock); |
1da177e4 | 5611 | |
aef7d97c | 5612 | return 0; |
1da177e4 LT |
5613 | } |
5614 | ||
aef7d97c MH |
5615 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5616 | { | |
5617 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5618 | } | |
5619 | ||
5620 | static const struct file_operations l2cap_debugfs_fops = { | |
5621 | .open = l2cap_debugfs_open, | |
5622 | .read = seq_read, | |
5623 | .llseek = seq_lseek, | |
5624 | .release = single_release, | |
5625 | }; | |
5626 | ||
5627 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5628 | |
64274518 | 5629 | int __init l2cap_init(void) |
1da177e4 LT |
5630 | { |
5631 | int err; | |
be9d1227 | 5632 | |
bb58f747 | 5633 | err = l2cap_init_sockets(); |
1da177e4 LT |
5634 | if (err < 0) |
5635 | return err; | |
5636 | ||
aef7d97c MH |
5637 | if (bt_debugfs) { |
5638 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5639 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5640 | if (!l2cap_debugfs) | |
5641 | BT_ERR("Failed to create L2CAP debug file"); | |
5642 | } | |
1da177e4 | 5643 | |
1da177e4 | 5644 | return 0; |
1da177e4 LT |
5645 | } |
5646 | ||
64274518 | 5647 | void l2cap_exit(void) |
1da177e4 | 5648 | { |
aef7d97c | 5649 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5650 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5651 | } |
5652 | ||
d1c4a17d GP |
5653 | module_param(disable_ertm, bool, 0644); |
5654 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |