Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/types.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/errno.h> |
36 | #include <linux/kernel.h> | |
1da177e4 LT |
37 | #include <linux/sched.h> |
38 | #include <linux/slab.h> | |
39 | #include <linux/poll.h> | |
40 | #include <linux/fcntl.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/interrupt.h> | |
43 | #include <linux/socket.h> | |
44 | #include <linux/skbuff.h> | |
1da177e4 | 45 | #include <linux/list.h> |
be9d1227 | 46 | #include <linux/device.h> |
aef7d97c MH |
47 | #include <linux/debugfs.h> |
48 | #include <linux/seq_file.h> | |
af05b30b | 49 | #include <linux/uaccess.h> |
fcc203c3 | 50 | #include <linux/crc16.h> |
1da177e4 LT |
51 | #include <net/sock.h> |
52 | ||
1da177e4 LT |
53 | #include <asm/unaligned.h> |
54 | ||
55 | #include <net/bluetooth/bluetooth.h> | |
56 | #include <net/bluetooth/hci_core.h> | |
57 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 58 | #include <net/bluetooth/smp.h> |
1da177e4 | 59 | |
eb939922 | 60 | bool disable_ertm; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 63 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 74 | struct l2cap_chan *chan, int err); |
1da177e4 | 75 | |
0139418c | 76 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 77 | |
baa7e1fa | 78 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 79 | { |
3df91ea2 | 80 | struct l2cap_chan *c; |
3d57dc68 | 81 | |
3df91ea2 AE |
82 | list_for_each_entry(c, &conn->chan_l, list) { |
83 | if (c->dcid == cid) | |
84 | return c; | |
0139418c | 85 | } |
3df91ea2 | 86 | return NULL; |
0139418c MH |
87 | } |
88 | ||
baa7e1fa | 89 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 90 | { |
3df91ea2 | 91 | struct l2cap_chan *c; |
3d57dc68 | 92 | |
3df91ea2 AE |
93 | list_for_each_entry(c, &conn->chan_l, list) { |
94 | if (c->scid == cid) | |
95 | return c; | |
0139418c | 96 | } |
3df91ea2 | 97 | return NULL; |
0139418c MH |
98 | } |
99 | ||
100 | /* Find channel with given SCID. | |
ef191ade | 101 | * Returns locked channel. */ |
baa7e1fa | 102 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 103 | { |
48454079 | 104 | struct l2cap_chan *c; |
baa7e1fa | 105 | |
3df91ea2 | 106 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 107 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
108 | if (c) |
109 | l2cap_chan_lock(c); | |
3df91ea2 AE |
110 | mutex_unlock(&conn->chan_lock); |
111 | ||
48454079 | 112 | return c; |
0139418c MH |
113 | } |
114 | ||
baa7e1fa | 115 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 116 | { |
3df91ea2 | 117 | struct l2cap_chan *c; |
3d57dc68 | 118 | |
3df91ea2 AE |
119 | list_for_each_entry(c, &conn->chan_l, list) { |
120 | if (c->ident == ident) | |
121 | return c; | |
0139418c | 122 | } |
3df91ea2 | 123 | return NULL; |
0139418c MH |
124 | } |
125 | ||
23691d75 | 126 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 127 | { |
23691d75 | 128 | struct l2cap_chan *c; |
9e4425ff | 129 | |
23691d75 GP |
130 | list_for_each_entry(c, &chan_list, global_l) { |
131 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 132 | return c; |
9e4425ff | 133 | } |
250938cb | 134 | return NULL; |
9e4425ff GP |
135 | } |
136 | ||
137 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
138 | { | |
73b2ec18 GP |
139 | int err; |
140 | ||
333055f2 | 141 | write_lock(&chan_list_lock); |
9e4425ff | 142 | |
23691d75 | 143 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
144 | err = -EADDRINUSE; |
145 | goto done; | |
9e4425ff GP |
146 | } |
147 | ||
73b2ec18 GP |
148 | if (psm) { |
149 | chan->psm = psm; | |
150 | chan->sport = psm; | |
151 | err = 0; | |
152 | } else { | |
153 | u16 p; | |
154 | ||
155 | err = -EINVAL; | |
156 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 157 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
158 | chan->psm = cpu_to_le16(p); |
159 | chan->sport = cpu_to_le16(p); | |
160 | err = 0; | |
161 | break; | |
162 | } | |
163 | } | |
9e4425ff | 164 | |
73b2ec18 | 165 | done: |
333055f2 | 166 | write_unlock(&chan_list_lock); |
73b2ec18 | 167 | return err; |
9e4425ff GP |
168 | } |
169 | ||
170 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
171 | { | |
333055f2 | 172 | write_lock(&chan_list_lock); |
9e4425ff GP |
173 | |
174 | chan->scid = scid; | |
175 | ||
333055f2 | 176 | write_unlock(&chan_list_lock); |
9e4425ff GP |
177 | |
178 | return 0; | |
179 | } | |
180 | ||
baa7e1fa | 181 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 182 | { |
8db4dc46 | 183 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 184 | |
8db4dc46 | 185 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 186 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
187 | return cid; |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
0e587be7 | 193 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 194 | { |
42d2d87c | 195 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
196 | state_to_string(state)); |
197 | ||
89bc500e GP |
198 | chan->state = state; |
199 | chan->ops->state_change(chan->data, state); | |
200 | } | |
201 | ||
0e587be7 AE |
202 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
203 | { | |
204 | struct sock *sk = chan->sk; | |
205 | ||
206 | lock_sock(sk); | |
207 | __l2cap_state_change(chan, state); | |
208 | release_sock(sk); | |
209 | } | |
210 | ||
2e0052e4 AE |
211 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
212 | { | |
213 | struct sock *sk = chan->sk; | |
214 | ||
215 | sk->sk_err = err; | |
216 | } | |
217 | ||
218 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
219 | { | |
220 | struct sock *sk = chan->sk; | |
221 | ||
222 | lock_sock(sk); | |
223 | __l2cap_chan_set_err(chan, err); | |
224 | release_sock(sk); | |
225 | } | |
226 | ||
3c588192 MM |
227 | /* ---- L2CAP sequence number lists ---- */ |
228 | ||
229 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
230 | * SREJ requests that are received and for frames that are to be | |
231 | * retransmitted. These seq_list functions implement a singly-linked | |
232 | * list in an array, where membership in the list can also be checked | |
233 | * in constant time. Items can also be added to the tail of the list | |
234 | * and removed from the head in constant time, without further memory | |
235 | * allocs or frees. | |
236 | */ | |
237 | ||
238 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
239 | { | |
240 | size_t alloc_size, i; | |
241 | ||
242 | /* Allocated size is a power of 2 to map sequence numbers | |
243 | * (which may be up to 14 bits) in to a smaller array that is | |
244 | * sized for the negotiated ERTM transmit windows. | |
245 | */ | |
246 | alloc_size = roundup_pow_of_two(size); | |
247 | ||
248 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
249 | if (!seq_list->list) | |
250 | return -ENOMEM; | |
251 | ||
252 | seq_list->mask = alloc_size - 1; | |
253 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
254 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
255 | for (i = 0; i < alloc_size; i++) | |
256 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
262 | { | |
263 | kfree(seq_list->list); | |
264 | } | |
265 | ||
266 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
267 | u16 seq) | |
268 | { | |
269 | /* Constant-time check for list membership */ | |
270 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
271 | } | |
272 | ||
273 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
274 | { | |
275 | u16 mask = seq_list->mask; | |
276 | ||
277 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
278 | /* In case someone tries to pop the head of an empty list */ | |
279 | return L2CAP_SEQ_LIST_CLEAR; | |
280 | } else if (seq_list->head == seq) { | |
281 | /* Head can be removed in constant time */ | |
282 | seq_list->head = seq_list->list[seq & mask]; | |
283 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
284 | ||
285 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
286 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
287 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
288 | } | |
289 | } else { | |
290 | /* Walk the list to find the sequence number */ | |
291 | u16 prev = seq_list->head; | |
292 | while (seq_list->list[prev & mask] != seq) { | |
293 | prev = seq_list->list[prev & mask]; | |
294 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } | |
297 | ||
298 | /* Unlink the number from the list and clear it */ | |
299 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
300 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
301 | if (seq_list->tail == seq) | |
302 | seq_list->tail = prev; | |
303 | } | |
304 | return seq; | |
305 | } | |
306 | ||
307 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
308 | { | |
309 | /* Remove the head in constant time */ | |
310 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
311 | } | |
312 | ||
313 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
314 | { | |
f522ae36 | 315 | u16 i; |
3c588192 | 316 | |
f522ae36 GP |
317 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
318 | return; | |
319 | ||
320 | for (i = 0; i <= seq_list->mask; i++) | |
321 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
322 | ||
323 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
324 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
325 | } |
326 | ||
327 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
328 | { | |
329 | u16 mask = seq_list->mask; | |
330 | ||
331 | /* All appends happen in constant time */ | |
332 | ||
f522ae36 GP |
333 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
3c588192 | 335 | |
f522ae36 GP |
336 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
337 | seq_list->head = seq; | |
338 | else | |
339 | seq_list->list[seq_list->tail & mask] = seq; | |
340 | ||
341 | seq_list->tail = seq; | |
342 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
343 | } |
344 | ||
721c4181 | 345 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 346 | { |
721c4181 GP |
347 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
348 | chan_timer.work); | |
3df91ea2 | 349 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
350 | int reason; |
351 | ||
e05dcc32 | 352 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 353 | |
3df91ea2 | 354 | mutex_lock(&conn->chan_lock); |
6be36555 | 355 | l2cap_chan_lock(chan); |
ab07801d | 356 | |
89bc500e | 357 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 358 | reason = ECONNREFUSED; |
89bc500e | 359 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
360 | chan->sec_level != BT_SECURITY_SDP) |
361 | reason = ECONNREFUSED; | |
362 | else | |
363 | reason = ETIMEDOUT; | |
364 | ||
0f852724 | 365 | l2cap_chan_close(chan, reason); |
ab07801d | 366 | |
6be36555 | 367 | l2cap_chan_unlock(chan); |
ab07801d | 368 | |
ba3bd0ee | 369 | chan->ops->close(chan->data); |
3df91ea2 AE |
370 | mutex_unlock(&conn->chan_lock); |
371 | ||
371fd835 | 372 | l2cap_chan_put(chan); |
ab07801d GP |
373 | } |
374 | ||
eef1d9b6 | 375 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
376 | { |
377 | struct l2cap_chan *chan; | |
378 | ||
379 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
380 | if (!chan) | |
381 | return NULL; | |
382 | ||
c03b355e AE |
383 | mutex_init(&chan->lock); |
384 | ||
333055f2 | 385 | write_lock(&chan_list_lock); |
23691d75 | 386 | list_add(&chan->global_l, &chan_list); |
333055f2 | 387 | write_unlock(&chan_list_lock); |
23691d75 | 388 | |
721c4181 | 389 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 390 | |
89bc500e GP |
391 | chan->state = BT_OPEN; |
392 | ||
71ba0e56 GP |
393 | atomic_set(&chan->refcnt, 1); |
394 | ||
2827011f MM |
395 | /* This flag is cleared in l2cap_chan_ready() */ |
396 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
397 | ||
eef1d9b6 | 398 | BT_DBG("chan %p", chan); |
abc545b8 | 399 | |
48454079 GP |
400 | return chan; |
401 | } | |
402 | ||
23691d75 | 403 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 404 | { |
333055f2 | 405 | write_lock(&chan_list_lock); |
23691d75 | 406 | list_del(&chan->global_l); |
333055f2 | 407 | write_unlock(&chan_list_lock); |
23691d75 | 408 | |
371fd835 | 409 | l2cap_chan_put(chan); |
6ff5abbf GP |
410 | } |
411 | ||
bd4b1653 AE |
412 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
413 | { | |
414 | chan->fcs = L2CAP_FCS_CRC16; | |
415 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
416 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
417 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
418 | chan->sec_level = BT_SECURITY_LOW; | |
419 | ||
420 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
421 | } | |
422 | ||
14a28491 | 423 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 424 | { |
af05b30b | 425 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 426 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 427 | |
9f5a0d7b | 428 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 429 | |
8c1d787b | 430 | chan->conn = conn; |
0139418c | 431 | |
5491120e AE |
432 | switch (chan->chan_type) { |
433 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
434 | if (conn->hcon->type == LE_LINK) { |
435 | /* LE connection */ | |
0c1bc5c6 | 436 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
437 | chan->scid = L2CAP_CID_LE_DATA; |
438 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
439 | } else { |
440 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 441 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 442 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 443 | } |
5491120e AE |
444 | break; |
445 | ||
446 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 447 | /* Connectionless socket */ |
fe4128e0 GP |
448 | chan->scid = L2CAP_CID_CONN_LESS; |
449 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 450 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
451 | break; |
452 | ||
453 | default: | |
0139418c | 454 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
455 | chan->scid = L2CAP_CID_SIGNALING; |
456 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 457 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
458 | } |
459 | ||
8f7975b1 AE |
460 | chan->local_id = L2CAP_BESTEFFORT_ID; |
461 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
462 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
463 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
464 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
465 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
466 | ||
371fd835 | 467 | l2cap_chan_hold(chan); |
baa7e1fa | 468 | |
3df91ea2 | 469 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
470 | } |
471 | ||
14a28491 | 472 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
473 | { |
474 | mutex_lock(&conn->chan_lock); | |
475 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 476 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
477 | } |
478 | ||
4519de9a | 479 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 480 | { |
48454079 | 481 | struct sock *sk = chan->sk; |
8c1d787b | 482 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
483 | struct sock *parent = bt_sk(sk)->parent; |
484 | ||
c9b66675 | 485 | __clear_chan_timer(chan); |
0139418c | 486 | |
49208c9c | 487 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 488 | |
8e87d142 | 489 | if (conn) { |
baa7e1fa | 490 | /* Delete from channel list */ |
3df91ea2 | 491 | list_del(&chan->list); |
3d57dc68 | 492 | |
371fd835 | 493 | l2cap_chan_put(chan); |
baa7e1fa | 494 | |
8c1d787b | 495 | chan->conn = NULL; |
0139418c MH |
496 | hci_conn_put(conn->hcon); |
497 | } | |
498 | ||
6be36555 AE |
499 | lock_sock(sk); |
500 | ||
0e587be7 | 501 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
502 | sock_set_flag(sk, SOCK_ZAPPED); |
503 | ||
504 | if (err) | |
2e0052e4 | 505 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
506 | |
507 | if (parent) { | |
508 | bt_accept_unlink(sk); | |
509 | parent->sk_data_ready(parent, 0); | |
510 | } else | |
511 | sk->sk_state_change(sk); | |
c13ffa62 | 512 | |
6be36555 AE |
513 | release_sock(sk); |
514 | ||
2827011f | 515 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 516 | return; |
2ead70b8 | 517 | |
58d35f87 | 518 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 519 | |
0c1bc5c6 | 520 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
521 | struct srej_list *l, *tmp; |
522 | ||
1a09bcb9 GP |
523 | __clear_retrans_timer(chan); |
524 | __clear_monitor_timer(chan); | |
525 | __clear_ack_timer(chan); | |
c13ffa62 | 526 | |
f1c6775b | 527 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 528 | |
3c588192 MM |
529 | l2cap_seq_list_free(&chan->srej_list); |
530 | l2cap_seq_list_free(&chan->retrans_list); | |
39d5a3ee | 531 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
532 | list_del(&l->list); |
533 | kfree(l); | |
534 | } | |
535 | } | |
0139418c MH |
536 | } |
537 | ||
4519de9a GP |
538 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
539 | { | |
540 | struct sock *sk; | |
541 | ||
542 | BT_DBG("parent %p", parent); | |
543 | ||
544 | /* Close not yet accepted channels */ | |
0f852724 | 545 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 546 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 547 | |
6be36555 | 548 | l2cap_chan_lock(chan); |
c9b66675 | 549 | __clear_chan_timer(chan); |
ba3bd0ee | 550 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 551 | l2cap_chan_unlock(chan); |
3df91ea2 | 552 | |
ba3bd0ee | 553 | chan->ops->close(chan->data); |
0f852724 | 554 | } |
4519de9a GP |
555 | } |
556 | ||
0f852724 | 557 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
558 | { |
559 | struct l2cap_conn *conn = chan->conn; | |
560 | struct sock *sk = chan->sk; | |
561 | ||
e05dcc32 AE |
562 | BT_DBG("chan %p state %s sk %p", chan, |
563 | state_to_string(chan->state), sk); | |
4519de9a | 564 | |
89bc500e | 565 | switch (chan->state) { |
4519de9a | 566 | case BT_LISTEN: |
6be36555 | 567 | lock_sock(sk); |
4519de9a | 568 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 569 | |
0e587be7 | 570 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 571 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 572 | release_sock(sk); |
4519de9a GP |
573 | break; |
574 | ||
575 | case BT_CONNECTED: | |
576 | case BT_CONFIG: | |
715ec005 | 577 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 578 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 579 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
580 | l2cap_send_disconn_req(conn, chan, reason); |
581 | } else | |
582 | l2cap_chan_del(chan, reason); | |
583 | break; | |
584 | ||
585 | case BT_CONNECT2: | |
715ec005 | 586 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
587 | conn->hcon->type == ACL_LINK) { |
588 | struct l2cap_conn_rsp rsp; | |
589 | __u16 result; | |
590 | ||
c5daa683 | 591 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
592 | result = L2CAP_CR_SEC_BLOCK; |
593 | else | |
594 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 595 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
596 | |
597 | rsp.scid = cpu_to_le16(chan->dcid); | |
598 | rsp.dcid = cpu_to_le16(chan->scid); | |
599 | rsp.result = cpu_to_le16(result); | |
600 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
601 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
602 | sizeof(rsp), &rsp); | |
603 | } | |
604 | ||
605 | l2cap_chan_del(chan, reason); | |
606 | break; | |
607 | ||
608 | case BT_CONNECT: | |
609 | case BT_DISCONN: | |
610 | l2cap_chan_del(chan, reason); | |
611 | break; | |
612 | ||
613 | default: | |
6be36555 | 614 | lock_sock(sk); |
4519de9a | 615 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 616 | release_sock(sk); |
4519de9a GP |
617 | break; |
618 | } | |
619 | } | |
620 | ||
4343478f | 621 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 622 | { |
715ec005 | 623 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 624 | switch (chan->sec_level) { |
8556edd3 JH |
625 | case BT_SECURITY_HIGH: |
626 | return HCI_AT_DEDICATED_BONDING_MITM; | |
627 | case BT_SECURITY_MEDIUM: | |
628 | return HCI_AT_DEDICATED_BONDING; | |
629 | default: | |
630 | return HCI_AT_NO_BONDING; | |
631 | } | |
fe4128e0 | 632 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
633 | if (chan->sec_level == BT_SECURITY_LOW) |
634 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 635 | |
4343478f | 636 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 637 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 638 | else |
8556edd3 | 639 | return HCI_AT_NO_BONDING; |
00ae4af9 | 640 | } else { |
4343478f | 641 | switch (chan->sec_level) { |
00ae4af9 | 642 | case BT_SECURITY_HIGH: |
8556edd3 | 643 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 644 | case BT_SECURITY_MEDIUM: |
8556edd3 | 645 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 646 | default: |
8556edd3 | 647 | return HCI_AT_NO_BONDING; |
00ae4af9 | 648 | } |
0684e5f9 | 649 | } |
8556edd3 JH |
650 | } |
651 | ||
652 | /* Service level security */ | |
d45fc423 | 653 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 654 | { |
8c1d787b | 655 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
656 | __u8 auth_type; |
657 | ||
4343478f | 658 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 659 | |
4343478f | 660 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
661 | } |
662 | ||
b5ad8b7f | 663 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
664 | { |
665 | u8 id; | |
666 | ||
667 | /* Get next available identificator. | |
668 | * 1 - 128 are used by kernel. | |
669 | * 129 - 199 are reserved. | |
670 | * 200 - 254 are used by utilities like l2ping, etc. | |
671 | */ | |
672 | ||
333055f2 | 673 | spin_lock(&conn->lock); |
4e8402a3 MH |
674 | |
675 | if (++conn->tx_ident > 128) | |
676 | conn->tx_ident = 1; | |
677 | ||
678 | id = conn->tx_ident; | |
679 | ||
333055f2 | 680 | spin_unlock(&conn->lock); |
4e8402a3 MH |
681 | |
682 | return id; | |
683 | } | |
684 | ||
4519de9a | 685 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
686 | { |
687 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 688 | u8 flags; |
4e8402a3 MH |
689 | |
690 | BT_DBG("code 0x%2.2x", code); | |
691 | ||
692 | if (!skb) | |
9a9c6a34 | 693 | return; |
4e8402a3 | 694 | |
e702112f AE |
695 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
696 | flags = ACL_START_NO_FLUSH; | |
697 | else | |
698 | flags = ACL_START; | |
699 | ||
14b12d0b | 700 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 701 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 702 | |
73d80deb LAD |
703 | hci_send_acl(conn->hchan, skb, flags); |
704 | } | |
705 | ||
706 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
707 | { | |
708 | struct hci_conn *hcon = chan->conn->hcon; | |
709 | u16 flags; | |
710 | ||
711 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
712 | skb->priority); | |
713 | ||
714 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
715 | lmp_no_flush_capable(hcon->hdev)) | |
716 | flags = ACL_START_NO_FLUSH; | |
717 | else | |
718 | flags = ACL_START; | |
14b12d0b | 719 | |
73d80deb LAD |
720 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
721 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
722 | } |
723 | ||
b76bbd66 MM |
724 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
725 | { | |
726 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
727 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
728 | ||
729 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
730 | /* S-Frame */ | |
731 | control->sframe = 1; | |
732 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
733 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
734 | ||
735 | control->sar = 0; | |
736 | control->txseq = 0; | |
737 | } else { | |
738 | /* I-Frame */ | |
739 | control->sframe = 0; | |
740 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
741 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
742 | ||
743 | control->poll = 0; | |
744 | control->super = 0; | |
745 | } | |
746 | } | |
747 | ||
b76bbd66 MM |
748 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
749 | { | |
750 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
751 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
752 | ||
753 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
754 | /* S-Frame */ | |
755 | control->sframe = 1; | |
756 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
757 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
758 | ||
759 | control->sar = 0; | |
760 | control->txseq = 0; | |
761 | } else { | |
762 | /* I-Frame */ | |
763 | control->sframe = 0; | |
764 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
765 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
766 | ||
767 | control->poll = 0; | |
768 | control->super = 0; | |
769 | } | |
770 | } | |
771 | ||
772 | static inline void __unpack_control(struct l2cap_chan *chan, | |
773 | struct sk_buff *skb) | |
774 | { | |
775 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
776 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
777 | &bt_cb(skb)->control); | |
778 | } else { | |
779 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
780 | &bt_cb(skb)->control); | |
781 | } | |
782 | } | |
783 | ||
b5c6aaed MM |
784 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
785 | { | |
786 | u32 packed; | |
787 | ||
788 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
789 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
790 | ||
791 | if (control->sframe) { | |
792 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
793 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
794 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
795 | } else { | |
796 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
797 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
798 | } | |
799 | ||
800 | return packed; | |
801 | } | |
802 | ||
803 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
804 | { | |
805 | u16 packed; | |
806 | ||
807 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
808 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
809 | ||
810 | if (control->sframe) { | |
811 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
812 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
813 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
814 | } else { | |
815 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
816 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
817 | } | |
818 | ||
819 | return packed; | |
820 | } | |
821 | ||
b76bbd66 MM |
822 | static inline void __pack_control(struct l2cap_chan *chan, |
823 | struct l2cap_ctrl *control, | |
824 | struct sk_buff *skb) | |
825 | { | |
826 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
827 | put_unaligned_le32(__pack_extended_control(control), | |
828 | skb->data + L2CAP_HDR_SIZE); | |
829 | } else { | |
830 | put_unaligned_le16(__pack_enhanced_control(control), | |
831 | skb->data + L2CAP_HDR_SIZE); | |
832 | } | |
833 | } | |
834 | ||
b5c6aaed MM |
835 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
836 | { | |
837 | struct sk_buff *skb; | |
838 | struct l2cap_hdr *lh; | |
839 | struct l2cap_conn *conn = chan->conn; | |
840 | int count, hlen; | |
841 | ||
842 | if (chan->state != BT_CONNECTED) | |
843 | return; | |
844 | ||
845 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
846 | hlen = L2CAP_EXT_HDR_SIZE; | |
847 | else | |
848 | hlen = L2CAP_ENH_HDR_SIZE; | |
849 | ||
850 | if (chan->fcs == L2CAP_FCS_CRC16) | |
851 | hlen += L2CAP_FCS_SIZE; | |
852 | ||
853 | BT_DBG("chan %p, control 0x%8.8x", chan, control); | |
854 | ||
855 | count = min_t(unsigned int, conn->mtu, hlen); | |
856 | ||
857 | control |= __set_sframe(chan); | |
858 | ||
859 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
860 | control |= __set_ctrl_final(chan); | |
861 | ||
862 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) | |
863 | control |= __set_ctrl_poll(chan); | |
864 | ||
865 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
866 | if (!skb) | |
867 | return; | |
868 | ||
869 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
870 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
871 | lh->cid = cpu_to_le16(chan->dcid); | |
872 | ||
873 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
874 | ||
875 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
876 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); | |
877 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
878 | } | |
879 | ||
880 | skb->priority = HCI_PRIO_MAX; | |
881 | l2cap_do_send(chan, skb); | |
882 | } | |
883 | ||
884 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) | |
885 | { | |
886 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
887 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); | |
888 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
889 | } else | |
890 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
891 | ||
892 | control |= __set_reqseq(chan, chan->buffer_seq); | |
893 | ||
894 | l2cap_send_sframe(chan, control); | |
895 | } | |
896 | ||
b4450035 | 897 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 898 | { |
c1360a1c | 899 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
900 | } |
901 | ||
9b27f350 AE |
902 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
903 | { | |
904 | struct l2cap_conn *conn = chan->conn; | |
905 | struct l2cap_conn_req req; | |
906 | ||
907 | req.scid = cpu_to_le16(chan->scid); | |
908 | req.psm = chan->psm; | |
909 | ||
910 | chan->ident = l2cap_get_ident(conn); | |
911 | ||
912 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
913 | ||
914 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
915 | } | |
916 | ||
9f0caeb1 VCG |
917 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
918 | { | |
919 | struct sock *sk = chan->sk; | |
920 | struct sock *parent; | |
921 | ||
922 | lock_sock(sk); | |
923 | ||
924 | parent = bt_sk(sk)->parent; | |
925 | ||
926 | BT_DBG("sk %p, parent %p", sk, parent); | |
927 | ||
2827011f | 928 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
929 | chan->conf_state = 0; |
930 | __clear_chan_timer(chan); | |
931 | ||
932 | __l2cap_state_change(chan, BT_CONNECTED); | |
933 | sk->sk_state_change(sk); | |
934 | ||
935 | if (parent) | |
936 | parent->sk_data_ready(parent, 0); | |
937 | ||
938 | release_sock(sk); | |
939 | } | |
940 | ||
fc7f8a7e | 941 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 942 | { |
8c1d787b | 943 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 944 | |
9f0caeb1 VCG |
945 | if (conn->hcon->type == LE_LINK) { |
946 | l2cap_chan_ready(chan); | |
947 | return; | |
948 | } | |
949 | ||
79d554a6 | 950 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
951 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
952 | return; | |
953 | ||
d45fc423 | 954 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
955 | __l2cap_no_conn_pending(chan)) |
956 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
957 | } else { |
958 | struct l2cap_info_req req; | |
959 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
960 | ||
961 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
962 | conn->info_ident = l2cap_get_ident(conn); | |
963 | ||
ba13ccd9 | 964 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
965 | |
966 | l2cap_send_cmd(conn, conn->info_ident, | |
967 | L2CAP_INFO_REQ, sizeof(req), &req); | |
968 | } | |
969 | } | |
970 | ||
cf6c2c0b GP |
971 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
972 | { | |
973 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 974 | if (!disable_ertm) |
cf6c2c0b GP |
975 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
976 | ||
977 | switch (mode) { | |
978 | case L2CAP_MODE_ERTM: | |
979 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
980 | case L2CAP_MODE_STREAMING: | |
981 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
982 | default: | |
983 | return 0x00; | |
984 | } | |
985 | } | |
986 | ||
4519de9a | 987 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 988 | { |
6be36555 | 989 | struct sock *sk = chan->sk; |
22121fc9 GP |
990 | struct l2cap_disconn_req req; |
991 | ||
c13ffa62 GP |
992 | if (!conn) |
993 | return; | |
994 | ||
0c1bc5c6 | 995 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
996 | __clear_retrans_timer(chan); |
997 | __clear_monitor_timer(chan); | |
998 | __clear_ack_timer(chan); | |
c13ffa62 GP |
999 | } |
1000 | ||
fe4128e0 GP |
1001 | req.dcid = cpu_to_le16(chan->dcid); |
1002 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1003 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1004 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1005 | |
6be36555 | 1006 | lock_sock(sk); |
0e587be7 | 1007 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1008 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1009 | release_sock(sk); |
22121fc9 GP |
1010 | } |
1011 | ||
1da177e4 | 1012 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1013 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1014 | { | |
3df91ea2 | 1015 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1016 | |
1017 | BT_DBG("conn %p", conn); | |
1018 | ||
3df91ea2 | 1019 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1020 | |
3df91ea2 | 1021 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1022 | struct sock *sk = chan->sk; |
baa7e1fa | 1023 | |
6be36555 | 1024 | l2cap_chan_lock(chan); |
4e8402a3 | 1025 | |
715ec005 | 1026 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1027 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1028 | continue; |
1029 | } | |
1030 | ||
89bc500e | 1031 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1032 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1033 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1034 | l2cap_chan_unlock(chan); |
47731de7 GP |
1035 | continue; |
1036 | } | |
79d554a6 | 1037 | |
c1360a1c GP |
1038 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1039 | && test_bit(CONF_STATE2_DEVICE, | |
1040 | &chan->conf_state)) { | |
89bc500e | 1041 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1042 | l2cap_chan_unlock(chan); |
47731de7 | 1043 | continue; |
b1235d79 | 1044 | } |
47731de7 | 1045 | |
9b27f350 | 1046 | l2cap_send_conn_req(chan); |
47731de7 | 1047 | |
89bc500e | 1048 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1049 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1050 | char buf[128]; |
fe4128e0 GP |
1051 | rsp.scid = cpu_to_le16(chan->dcid); |
1052 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1053 | |
d45fc423 | 1054 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1055 | lock_sock(sk); |
c5daa683 GP |
1056 | if (test_bit(BT_SK_DEFER_SETUP, |
1057 | &bt_sk(sk)->flags)) { | |
f66dc81f MH |
1058 | struct sock *parent = bt_sk(sk)->parent; |
1059 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1060 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1061 | if (parent) |
1062 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1063 | |
1064 | } else { | |
0e587be7 | 1065 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
1066 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1067 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1068 | } | |
6be36555 | 1069 | release_sock(sk); |
79d554a6 MH |
1070 | } else { |
1071 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1072 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
1073 | } | |
1074 | ||
fc7f8a7e GP |
1075 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1076 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1077 | |
c1360a1c | 1078 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1079 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1080 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1081 | continue; |
1082 | } | |
1083 | ||
c1360a1c | 1084 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1085 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1086 | l2cap_build_conf_req(chan, buf), buf); |
1087 | chan->num_conf_req++; | |
4e8402a3 MH |
1088 | } |
1089 | ||
6be36555 | 1090 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1091 | } |
1092 | ||
3df91ea2 | 1093 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1094 | } |
1095 | ||
c2287681 | 1096 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1097 | * Returns closest match, locked. |
1098 | */ | |
d9b88702 | 1099 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1100 | bdaddr_t *src, |
1101 | bdaddr_t *dst) | |
b62f328b | 1102 | { |
23691d75 | 1103 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1104 | |
23691d75 | 1105 | read_lock(&chan_list_lock); |
b62f328b | 1106 | |
23691d75 GP |
1107 | list_for_each_entry(c, &chan_list, global_l) { |
1108 | struct sock *sk = c->sk; | |
fe4128e0 | 1109 | |
89bc500e | 1110 | if (state && c->state != state) |
b62f328b VT |
1111 | continue; |
1112 | ||
23691d75 | 1113 | if (c->scid == cid) { |
c2287681 IY |
1114 | int src_match, dst_match; |
1115 | int src_any, dst_any; | |
1116 | ||
b62f328b | 1117 | /* Exact match. */ |
c2287681 IY |
1118 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1119 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1120 | if (src_match && dst_match) { | |
23691d75 GP |
1121 | read_unlock(&chan_list_lock); |
1122 | return c; | |
1123 | } | |
b62f328b VT |
1124 | |
1125 | /* Closest match */ | |
c2287681 IY |
1126 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1127 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1128 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1129 | (src_any && dst_any)) | |
23691d75 | 1130 | c1 = c; |
b62f328b VT |
1131 | } |
1132 | } | |
280f294f | 1133 | |
23691d75 | 1134 | read_unlock(&chan_list_lock); |
b62f328b | 1135 | |
23691d75 | 1136 | return c1; |
b62f328b VT |
1137 | } |
1138 | ||
1139 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1140 | { | |
c916fbe4 | 1141 | struct sock *parent, *sk; |
23691d75 | 1142 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1143 | |
1144 | BT_DBG(""); | |
1145 | ||
1146 | /* Check if we have socket listening on cid */ | |
23691d75 | 1147 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1148 | conn->src, conn->dst); |
23691d75 | 1149 | if (!pchan) |
b62f328b VT |
1150 | return; |
1151 | ||
23691d75 GP |
1152 | parent = pchan->sk; |
1153 | ||
aa2ac881 | 1154 | lock_sock(parent); |
62f3a2cf | 1155 | |
b62f328b VT |
1156 | /* Check for backlog size */ |
1157 | if (sk_acceptq_is_full(parent)) { | |
1158 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1159 | goto clean; | |
1160 | } | |
1161 | ||
80808e43 GP |
1162 | chan = pchan->ops->new_connection(pchan->data); |
1163 | if (!chan) | |
b62f328b VT |
1164 | goto clean; |
1165 | ||
80808e43 | 1166 | sk = chan->sk; |
5d41ce1d | 1167 | |
b62f328b VT |
1168 | hci_conn_hold(conn->hcon); |
1169 | ||
b62f328b VT |
1170 | bacpy(&bt_sk(sk)->src, conn->src); |
1171 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1172 | ||
d1010240 GP |
1173 | bt_accept_enqueue(parent, sk); |
1174 | ||
3d57dc68 | 1175 | l2cap_chan_add(conn, chan); |
48454079 | 1176 | |
c9b66675 | 1177 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1178 | |
0e587be7 | 1179 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1180 | parent->sk_data_ready(parent, 0); |
1181 | ||
b62f328b | 1182 | clean: |
aa2ac881 | 1183 | release_sock(parent); |
b62f328b VT |
1184 | } |
1185 | ||
4e8402a3 MH |
1186 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1187 | { | |
48454079 | 1188 | struct l2cap_chan *chan; |
4e8402a3 | 1189 | |
79d554a6 | 1190 | BT_DBG("conn %p", conn); |
4e8402a3 | 1191 | |
b62f328b VT |
1192 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1193 | l2cap_le_conn_ready(conn); | |
1194 | ||
160dc6ac VCG |
1195 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1196 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1197 | ||
3df91ea2 | 1198 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1199 | |
3df91ea2 | 1200 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1201 | |
6be36555 | 1202 | l2cap_chan_lock(chan); |
4e8402a3 | 1203 | |
63128451 | 1204 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1205 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1206 | l2cap_chan_ready(chan); |
acd7d370 | 1207 | |
63128451 | 1208 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1209 | struct sock *sk = chan->sk; |
c9b66675 | 1210 | __clear_chan_timer(chan); |
6be36555 | 1211 | lock_sock(sk); |
0e587be7 | 1212 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1213 | sk->sk_state_change(sk); |
6be36555 | 1214 | release_sock(sk); |
b501d6a1 | 1215 | |
89bc500e | 1216 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1217 | l2cap_do_start(chan); |
4e8402a3 | 1218 | |
6be36555 | 1219 | l2cap_chan_unlock(chan); |
4e8402a3 | 1220 | } |
79d554a6 | 1221 | |
3df91ea2 | 1222 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1223 | } |
1224 | ||
1225 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1226 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1227 | { | |
48454079 | 1228 | struct l2cap_chan *chan; |
4e8402a3 MH |
1229 | |
1230 | BT_DBG("conn %p", conn); | |
1231 | ||
3df91ea2 | 1232 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1233 | |
3df91ea2 | 1234 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1235 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1236 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1237 | } |
1238 | ||
3df91ea2 | 1239 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1240 | } |
1241 | ||
f878fcad | 1242 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1243 | { |
f878fcad | 1244 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1245 | info_timer.work); |
4e8402a3 | 1246 | |
984947dc | 1247 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1248 | conn->info_ident = 0; |
984947dc | 1249 | |
4e8402a3 MH |
1250 | l2cap_conn_start(conn); |
1251 | } | |
1252 | ||
5d3de7df VCG |
1253 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1254 | { | |
1255 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1256 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1257 | |
1258 | if (!conn) | |
1259 | return; | |
1260 | ||
1261 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1262 | ||
1263 | kfree_skb(conn->rx_skb); | |
1264 | ||
3df91ea2 AE |
1265 | mutex_lock(&conn->chan_lock); |
1266 | ||
5d3de7df VCG |
1267 | /* Kill channels */ |
1268 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1269 | l2cap_chan_hold(chan); |
6be36555 AE |
1270 | l2cap_chan_lock(chan); |
1271 | ||
5d3de7df | 1272 | l2cap_chan_del(chan, err); |
6be36555 AE |
1273 | |
1274 | l2cap_chan_unlock(chan); | |
1275 | ||
5d3de7df | 1276 | chan->ops->close(chan->data); |
61d6ef3e | 1277 | l2cap_chan_put(chan); |
5d3de7df VCG |
1278 | } |
1279 | ||
3df91ea2 AE |
1280 | mutex_unlock(&conn->chan_lock); |
1281 | ||
73d80deb LAD |
1282 | hci_chan_del(conn->hchan); |
1283 | ||
5d3de7df | 1284 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1285 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1286 | |
51a8efd7 | 1287 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1288 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1289 | smp_chan_destroy(conn); |
d26a2345 | 1290 | } |
5d3de7df VCG |
1291 | |
1292 | hcon->l2cap_data = NULL; | |
1293 | kfree(conn); | |
1294 | } | |
1295 | ||
6c9d42a1 | 1296 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1297 | { |
6c9d42a1 GP |
1298 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1299 | security_timer.work); | |
5d3de7df VCG |
1300 | |
1301 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1302 | } | |
1303 | ||
1da177e4 LT |
1304 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1305 | { | |
0139418c | 1306 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1307 | struct hci_chan *hchan; |
1da177e4 | 1308 | |
0139418c | 1309 | if (conn || status) |
1da177e4 LT |
1310 | return conn; |
1311 | ||
73d80deb LAD |
1312 | hchan = hci_chan_create(hcon); |
1313 | if (!hchan) | |
1314 | return NULL; | |
1315 | ||
0139418c | 1316 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1317 | if (!conn) { |
1318 | hci_chan_del(hchan); | |
1da177e4 | 1319 | return NULL; |
73d80deb | 1320 | } |
1da177e4 LT |
1321 | |
1322 | hcon->l2cap_data = conn; | |
1323 | conn->hcon = hcon; | |
73d80deb | 1324 | conn->hchan = hchan; |
1da177e4 | 1325 | |
73d80deb | 1326 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1327 | |
acd7d370 VT |
1328 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1329 | conn->mtu = hcon->hdev->le_mtu; | |
1330 | else | |
1331 | conn->mtu = hcon->hdev->acl_mtu; | |
1332 | ||
1da177e4 LT |
1333 | conn->src = &hcon->hdev->bdaddr; |
1334 | conn->dst = &hcon->dst; | |
1335 | ||
4e8402a3 MH |
1336 | conn->feat_mask = 0; |
1337 | ||
1da177e4 | 1338 | spin_lock_init(&conn->lock); |
3df91ea2 | 1339 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1340 | |
1341 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1342 | |
5d3de7df | 1343 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1344 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1345 | else |
030013d8 | 1346 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1347 | |
9f5a0d7b | 1348 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1349 | |
1da177e4 LT |
1350 | return conn; |
1351 | } | |
1352 | ||
1da177e4 | 1353 | /* ---- Socket interface ---- */ |
1da177e4 | 1354 | |
c2287681 | 1355 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1356 | * Returns closest match. |
1357 | */ | |
c2287681 IY |
1358 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1359 | bdaddr_t *src, | |
1360 | bdaddr_t *dst) | |
1da177e4 | 1361 | { |
23691d75 | 1362 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1363 | |
23691d75 | 1364 | read_lock(&chan_list_lock); |
e0f0cb56 | 1365 | |
23691d75 GP |
1366 | list_for_each_entry(c, &chan_list, global_l) { |
1367 | struct sock *sk = c->sk; | |
fe4128e0 | 1368 | |
89bc500e | 1369 | if (state && c->state != state) |
1da177e4 LT |
1370 | continue; |
1371 | ||
23691d75 | 1372 | if (c->psm == psm) { |
c2287681 IY |
1373 | int src_match, dst_match; |
1374 | int src_any, dst_any; | |
1375 | ||
1da177e4 | 1376 | /* Exact match. */ |
c2287681 IY |
1377 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1378 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1379 | if (src_match && dst_match) { | |
a7567b20 | 1380 | read_unlock(&chan_list_lock); |
23691d75 GP |
1381 | return c; |
1382 | } | |
1da177e4 LT |
1383 | |
1384 | /* Closest match */ | |
c2287681 IY |
1385 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1386 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1387 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1388 | (src_any && dst_any)) | |
23691d75 | 1389 | c1 = c; |
1da177e4 LT |
1390 | } |
1391 | } | |
1da177e4 | 1392 | |
23691d75 | 1393 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1394 | |
23691d75 | 1395 | return c1; |
1da177e4 LT |
1396 | } |
1397 | ||
8e9f9892 AG |
1398 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1399 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1400 | { |
5d41ce1d | 1401 | struct sock *sk = chan->sk; |
1da177e4 | 1402 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1403 | struct l2cap_conn *conn; |
1404 | struct hci_conn *hcon; | |
1405 | struct hci_dev *hdev; | |
09ab6f4c | 1406 | __u8 auth_type; |
44d0e48e | 1407 | int err; |
1da177e4 | 1408 | |
8e9f9892 AG |
1409 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1410 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1411 | |
af05b30b GP |
1412 | hdev = hci_get_route(dst, src); |
1413 | if (!hdev) | |
1da177e4 LT |
1414 | return -EHOSTUNREACH; |
1415 | ||
09fd0de5 | 1416 | hci_dev_lock(hdev); |
1da177e4 | 1417 | |
6be36555 | 1418 | l2cap_chan_lock(chan); |
03a00194 GP |
1419 | |
1420 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1421 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1422 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1423 | err = -EINVAL; | |
1424 | goto done; | |
1425 | } | |
1426 | ||
1427 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1428 | err = -EINVAL; | |
1429 | goto done; | |
1430 | } | |
1431 | ||
1432 | switch (chan->mode) { | |
1433 | case L2CAP_MODE_BASIC: | |
1434 | break; | |
1435 | case L2CAP_MODE_ERTM: | |
1436 | case L2CAP_MODE_STREAMING: | |
1437 | if (!disable_ertm) | |
1438 | break; | |
1439 | /* fall through */ | |
1440 | default: | |
1441 | err = -ENOTSUPP; | |
1442 | goto done; | |
1443 | } | |
1444 | ||
6be36555 AE |
1445 | lock_sock(sk); |
1446 | ||
03a00194 GP |
1447 | switch (sk->sk_state) { |
1448 | case BT_CONNECT: | |
1449 | case BT_CONNECT2: | |
1450 | case BT_CONFIG: | |
1451 | /* Already connecting */ | |
1452 | err = 0; | |
6be36555 | 1453 | release_sock(sk); |
03a00194 GP |
1454 | goto done; |
1455 | ||
1456 | case BT_CONNECTED: | |
1457 | /* Already connected */ | |
1458 | err = -EISCONN; | |
6be36555 | 1459 | release_sock(sk); |
03a00194 GP |
1460 | goto done; |
1461 | ||
1462 | case BT_OPEN: | |
1463 | case BT_BOUND: | |
1464 | /* Can connect */ | |
1465 | break; | |
1466 | ||
1467 | default: | |
1468 | err = -EBADFD; | |
6be36555 | 1469 | release_sock(sk); |
03a00194 GP |
1470 | goto done; |
1471 | } | |
1472 | ||
1473 | /* Set destination address and psm */ | |
9219b2a0 | 1474 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1475 | |
1476 | release_sock(sk); | |
1477 | ||
03a00194 GP |
1478 | chan->psm = psm; |
1479 | chan->dcid = cid; | |
1da177e4 | 1480 | |
4343478f | 1481 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1482 | |
fe4128e0 | 1483 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1484 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1485 | chan->sec_level, auth_type); |
acd7d370 | 1486 | else |
8e9f9892 | 1487 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1488 | chan->sec_level, auth_type); |
acd7d370 | 1489 | |
30e76272 VT |
1490 | if (IS_ERR(hcon)) { |
1491 | err = PTR_ERR(hcon); | |
1da177e4 | 1492 | goto done; |
30e76272 | 1493 | } |
1da177e4 LT |
1494 | |
1495 | conn = l2cap_conn_add(hcon, 0); | |
1496 | if (!conn) { | |
1497 | hci_conn_put(hcon); | |
30e76272 | 1498 | err = -ENOMEM; |
1da177e4 LT |
1499 | goto done; |
1500 | } | |
1501 | ||
9f0caeb1 VCG |
1502 | if (hcon->type == LE_LINK) { |
1503 | err = 0; | |
1504 | ||
1505 | if (!list_empty(&conn->chan_l)) { | |
1506 | err = -EBUSY; | |
1507 | hci_conn_put(hcon); | |
1508 | } | |
1509 | ||
1510 | if (err) | |
1511 | goto done; | |
1512 | } | |
1513 | ||
1da177e4 LT |
1514 | /* Update source addr of the socket */ |
1515 | bacpy(src, conn->src); | |
1516 | ||
6be36555 | 1517 | l2cap_chan_unlock(chan); |
48454079 | 1518 | l2cap_chan_add(conn, chan); |
6be36555 | 1519 | l2cap_chan_lock(chan); |
48454079 | 1520 | |
6be36555 | 1521 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1522 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1523 | |
1524 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1525 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1526 | __clear_chan_timer(chan); |
d45fc423 | 1527 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1528 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1529 | } else |
fc7f8a7e | 1530 | l2cap_do_start(chan); |
1da177e4 LT |
1531 | } |
1532 | ||
30e76272 VT |
1533 | err = 0; |
1534 | ||
1da177e4 | 1535 | done: |
6be36555 | 1536 | l2cap_chan_unlock(chan); |
09fd0de5 | 1537 | hci_dev_unlock(hdev); |
1da177e4 LT |
1538 | hci_dev_put(hdev); |
1539 | return err; | |
1540 | } | |
1541 | ||
dcba0dba | 1542 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1543 | { |
8c1d787b | 1544 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1545 | DECLARE_WAITQUEUE(wait, current); |
1546 | int err = 0; | |
1547 | int timeo = HZ/5; | |
1548 | ||
2b0b05dd | 1549 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1550 | set_current_state(TASK_INTERRUPTIBLE); |
1551 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1552 | if (!timeo) |
1553 | timeo = HZ/5; | |
1554 | ||
1555 | if (signal_pending(current)) { | |
1556 | err = sock_intr_errno(timeo); | |
1557 | break; | |
1558 | } | |
1559 | ||
1560 | release_sock(sk); | |
1561 | timeo = schedule_timeout(timeo); | |
1562 | lock_sock(sk); | |
a71a0cf4 | 1563 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1564 | |
1565 | err = sock_error(sk); | |
1566 | if (err) | |
1567 | break; | |
1568 | } | |
1569 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1570 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1571 | return err; |
1572 | } | |
1573 | ||
721c4181 | 1574 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1575 | { |
721c4181 GP |
1576 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1577 | monitor_timer.work); | |
e90bac06 | 1578 | |
525cd185 | 1579 | BT_DBG("chan %p", chan); |
0e98958d | 1580 | |
6be36555 AE |
1581 | l2cap_chan_lock(chan); |
1582 | ||
2c03a7a4 | 1583 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1584 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1585 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1586 | l2cap_chan_put(chan); |
e90bac06 GP |
1587 | return; |
1588 | } | |
1589 | ||
6a026610 | 1590 | chan->retry_count++; |
1a09bcb9 | 1591 | __set_monitor_timer(chan); |
e90bac06 | 1592 | |
525cd185 | 1593 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1594 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1595 | l2cap_chan_put(chan); |
e90bac06 GP |
1596 | } |
1597 | ||
721c4181 | 1598 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1599 | { |
721c4181 GP |
1600 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1601 | retrans_timer.work); | |
e90bac06 | 1602 | |
49208c9c | 1603 | BT_DBG("chan %p", chan); |
0e98958d | 1604 | |
6be36555 AE |
1605 | l2cap_chan_lock(chan); |
1606 | ||
6a026610 | 1607 | chan->retry_count = 1; |
1a09bcb9 | 1608 | __set_monitor_timer(chan); |
e90bac06 | 1609 | |
e2ab4353 | 1610 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1611 | |
525cd185 | 1612 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1613 | |
1614 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1615 | l2cap_chan_put(chan); |
e90bac06 GP |
1616 | } |
1617 | ||
42e5c802 | 1618 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1619 | { |
1c2acffb | 1620 | struct sk_buff *skb; |
1da177e4 | 1621 | |
58d35f87 | 1622 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1623 | chan->unacked_frames) { |
3ce3514f | 1624 | if (bt_cb(skb)->control.txseq == chan->expected_ack_seq) |
1c2acffb | 1625 | break; |
1da177e4 | 1626 | |
58d35f87 | 1627 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1628 | kfree_skb(skb); |
1da177e4 | 1629 | |
6a026610 | 1630 | chan->unacked_frames--; |
1c2acffb | 1631 | } |
1da177e4 | 1632 | |
6a026610 | 1633 | if (!chan->unacked_frames) |
1a09bcb9 | 1634 | __clear_retrans_timer(chan); |
1c2acffb | 1635 | } |
1da177e4 | 1636 | |
67c9e840 | 1637 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1638 | { |
ccbb84af | 1639 | struct sk_buff *skb; |
88843ab0 AE |
1640 | u32 control; |
1641 | u16 fcs; | |
6840ed07 | 1642 | |
58d35f87 | 1643 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1644 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1645 | control |= __set_txseq(chan, chan->next_tx_seq); |
94122bbe | 1646 | control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
88843ab0 | 1647 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1648 | |
47d1ec61 | 1649 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1650 | fcs = crc16(0, (u8 *)skb->data, |
1651 | skb->len - L2CAP_FCS_SIZE); | |
1652 | put_unaligned_le16(fcs, | |
1653 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1654 | } |
1655 | ||
4343478f | 1656 | l2cap_do_send(chan, skb); |
6840ed07 | 1657 | |
836be934 | 1658 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1659 | } |
6840ed07 GP |
1660 | } |
1661 | ||
fb45de7d | 1662 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1663 | { |
8f17154f | 1664 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1665 | u16 fcs; |
1666 | u32 control; | |
8f17154f | 1667 | |
58d35f87 | 1668 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1669 | if (!skb) |
1670 | return; | |
8f17154f | 1671 | |
3ce3514f | 1672 | while (bt_cb(skb)->control.txseq != tx_seq) { |
58d35f87 | 1673 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1674 | return; |
8f17154f | 1675 | |
d1726b6d SJ |
1676 | skb = skb_queue_next(&chan->tx_q, skb); |
1677 | } | |
8f17154f | 1678 | |
3ce3514f MM |
1679 | if (bt_cb(skb)->control.retries == chan->remote_max_tx && |
1680 | chan->remote_max_tx) { | |
8c1d787b | 1681 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1682 | return; |
1683 | } | |
1684 | ||
1685 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
3ce3514f | 1686 | bt_cb(skb)->control.retries++; |
88843ab0 AE |
1687 | |
1688 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1689 | control &= __get_sar_mask(chan); |
3cb123d1 | 1690 | |
e2ab4353 | 1691 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1692 | control |= __set_ctrl_final(chan); |
95ffa978 | 1693 | |
0b209fae | 1694 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1695 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1696 | |
88843ab0 | 1697 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1698 | |
47d1ec61 | 1699 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1700 | fcs = crc16(0, (u8 *)tx_skb->data, |
1701 | tx_skb->len - L2CAP_FCS_SIZE); | |
1702 | put_unaligned_le16(fcs, | |
1703 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1704 | } |
1705 | ||
4343478f | 1706 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1707 | } |
1708 | ||
67c9e840 | 1709 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1710 | { |
1711 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1712 | u16 fcs; |
1713 | u32 control; | |
9a9c6a34 | 1714 | int nsent = 0; |
1c2acffb | 1715 | |
89bc500e | 1716 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1717 | return -ENOTCONN; |
e90bac06 | 1718 | |
94122bbe MM |
1719 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1720 | return 0; | |
1721 | ||
58d35f87 | 1722 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1723 | |
3ce3514f MM |
1724 | if (bt_cb(skb)->control.retries == chan->remote_max_tx && |
1725 | chan->remote_max_tx) { | |
8c1d787b | 1726 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1727 | break; |
1728 | } | |
1729 | ||
e420aba3 AE |
1730 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1731 | ||
3ce3514f | 1732 | bt_cb(skb)->control.retries++; |
e90bac06 | 1733 | |
88843ab0 | 1734 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1735 | control &= __get_sar_mask(chan); |
95ffa978 | 1736 | |
e2ab4353 | 1737 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1738 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1739 | |
0b209fae | 1740 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1741 | control |= __set_txseq(chan, chan->next_tx_seq); |
94122bbe | 1742 | control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
1c2acffb | 1743 | |
88843ab0 | 1744 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1745 | |
47d1ec61 | 1746 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1747 | fcs = crc16(0, (u8 *)skb->data, |
1748 | tx_skb->len - L2CAP_FCS_SIZE); | |
1749 | put_unaligned_le16(fcs, skb->data + | |
1750 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1751 | } |
1752 | ||
4343478f | 1753 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1754 | |
1a09bcb9 | 1755 | __set_retrans_timer(chan); |
1c2acffb | 1756 | |
3ce3514f | 1757 | bt_cb(skb)->control.txseq = chan->next_tx_seq; |
836be934 AE |
1758 | |
1759 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1760 | |
3ce3514f | 1761 | if (bt_cb(skb)->control.retries == 1) { |
6a026610 | 1762 | chan->unacked_frames++; |
930fa4ae SJ |
1763 | |
1764 | if (!nsent++) | |
1765 | __clear_ack_timer(chan); | |
8ed7a0ae | 1766 | } |
23e9fde2 | 1767 | |
6a026610 | 1768 | chan->frames_sent++; |
1c2acffb | 1769 | |
58d35f87 GP |
1770 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1771 | chan->tx_send_head = NULL; | |
1c2acffb | 1772 | else |
58d35f87 | 1773 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
1c2acffb GP |
1774 | } |
1775 | ||
9e917af1 GP |
1776 | return nsent; |
1777 | } | |
1778 | ||
525cd185 | 1779 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1780 | { |
dfc909be GP |
1781 | int ret; |
1782 | ||
58d35f87 GP |
1783 | if (!skb_queue_empty(&chan->tx_q)) |
1784 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1785 | |
42e5c802 | 1786 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1787 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1788 | return ret; |
1789 | } | |
1790 | ||
b17e73bb | 1791 | static void __l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1792 | { |
88843ab0 | 1793 | u32 control = 0; |
9e917af1 | 1794 | |
0b209fae | 1795 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1796 | |
e2ab4353 | 1797 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1798 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1799 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1800 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1801 | return; |
9e917af1 | 1802 | } |
dfc909be | 1803 | |
525cd185 | 1804 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1805 | return; |
1806 | ||
ab784b73 | 1807 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1808 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1809 | } |
1810 | ||
b17e73bb SJ |
1811 | static void l2cap_send_ack(struct l2cap_chan *chan) |
1812 | { | |
1813 | __clear_ack_timer(chan); | |
1814 | __l2cap_send_ack(chan); | |
1815 | } | |
1816 | ||
525cd185 | 1817 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1818 | { |
1819 | struct srej_list *tail; | |
88843ab0 | 1820 | u32 control; |
99b0d4b7 | 1821 | |
ab784b73 | 1822 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1823 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1824 | |
39d5a3ee | 1825 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1826 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1827 | |
525cd185 | 1828 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1829 | } |
1830 | ||
04124681 GP |
1831 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1832 | struct msghdr *msg, int len, | |
1833 | int count, struct sk_buff *skb) | |
1c2acffb | 1834 | { |
0952a57a | 1835 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1836 | struct sk_buff **frag; |
90338947 | 1837 | int sent = 0; |
1da177e4 | 1838 | |
59203a21 | 1839 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1840 | return -EFAULT; |
1da177e4 LT |
1841 | |
1842 | sent += count; | |
1843 | len -= count; | |
1844 | ||
1845 | /* Continuation fragments (no L2CAP header) */ | |
1846 | frag = &skb_shinfo(skb)->frag_list; | |
1847 | while (len) { | |
fbe00700 GP |
1848 | struct sk_buff *tmp; |
1849 | ||
1da177e4 LT |
1850 | count = min_t(unsigned int, conn->mtu, len); |
1851 | ||
fbe00700 GP |
1852 | tmp = chan->ops->alloc_skb(chan, count, |
1853 | msg->msg_flags & MSG_DONTWAIT); | |
1854 | if (IS_ERR(tmp)) | |
1855 | return PTR_ERR(tmp); | |
1856 | ||
1857 | *frag = tmp; | |
2f7719ce | 1858 | |
1c2acffb GP |
1859 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1860 | return -EFAULT; | |
1da177e4 | 1861 | |
5e59b791 LAD |
1862 | (*frag)->priority = skb->priority; |
1863 | ||
1da177e4 LT |
1864 | sent += count; |
1865 | len -= count; | |
1866 | ||
2d0ed3d5 GP |
1867 | skb->len += (*frag)->len; |
1868 | skb->data_len += (*frag)->len; | |
1869 | ||
1da177e4 LT |
1870 | frag = &(*frag)->next; |
1871 | } | |
1da177e4 LT |
1872 | |
1873 | return sent; | |
1c2acffb | 1874 | } |
1da177e4 | 1875 | |
5e59b791 LAD |
1876 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1877 | struct msghdr *msg, size_t len, | |
1878 | u32 priority) | |
1c2acffb | 1879 | { |
8c1d787b | 1880 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1881 | struct sk_buff *skb; |
03a51213 | 1882 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1883 | struct l2cap_hdr *lh; |
1884 | ||
6d5922b0 | 1885 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1886 | |
1887 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1888 | |
1889 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1890 | msg->msg_flags & MSG_DONTWAIT); |
1891 | if (IS_ERR(skb)) | |
1892 | return skb; | |
1c2acffb | 1893 | |
5e59b791 LAD |
1894 | skb->priority = priority; |
1895 | ||
1c2acffb GP |
1896 | /* Create L2CAP header */ |
1897 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1898 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1899 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1900 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1901 | |
0952a57a | 1902 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1903 | if (unlikely(err < 0)) { |
1904 | kfree_skb(skb); | |
1905 | return ERR_PTR(err); | |
1906 | } | |
1907 | return skb; | |
1908 | } | |
1909 | ||
5e59b791 LAD |
1910 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1911 | struct msghdr *msg, size_t len, | |
1912 | u32 priority) | |
1c2acffb | 1913 | { |
8c1d787b | 1914 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1915 | struct sk_buff *skb; |
f2ba7fae | 1916 | int err, count; |
1c2acffb GP |
1917 | struct l2cap_hdr *lh; |
1918 | ||
6d5922b0 | 1919 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1920 | |
f2ba7fae | 1921 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1922 | |
f2ba7fae | 1923 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1924 | msg->msg_flags & MSG_DONTWAIT); |
1925 | if (IS_ERR(skb)) | |
1926 | return skb; | |
1c2acffb | 1927 | |
5e59b791 LAD |
1928 | skb->priority = priority; |
1929 | ||
1c2acffb GP |
1930 | /* Create L2CAP header */ |
1931 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1932 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1933 | lh->len = cpu_to_le16(len); |
1c2acffb | 1934 | |
0952a57a | 1935 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1936 | if (unlikely(err < 0)) { |
1937 | kfree_skb(skb); | |
1938 | return ERR_PTR(err); | |
1939 | } | |
1940 | return skb; | |
1941 | } | |
1942 | ||
ab0ff76d LAD |
1943 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1944 | struct msghdr *msg, size_t len, | |
94122bbe | 1945 | u16 sdulen) |
1c2acffb | 1946 | { |
8c1d787b | 1947 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1948 | struct sk_buff *skb; |
e4ca6d98 | 1949 | int err, count, hlen; |
1c2acffb GP |
1950 | struct l2cap_hdr *lh; |
1951 | ||
6d5922b0 | 1952 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1953 | |
0ee0d208 GP |
1954 | if (!conn) |
1955 | return ERR_PTR(-ENOTCONN); | |
1956 | ||
e4ca6d98 AE |
1957 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1958 | hlen = L2CAP_EXT_HDR_SIZE; | |
1959 | else | |
1960 | hlen = L2CAP_ENH_HDR_SIZE; | |
1961 | ||
c74e560c | 1962 | if (sdulen) |
03a51213 | 1963 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1964 | |
47d1ec61 | 1965 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1966 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1967 | |
1c2acffb | 1968 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
1969 | |
1970 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1971 | msg->msg_flags & MSG_DONTWAIT); |
1972 | if (IS_ERR(skb)) | |
1973 | return skb; | |
1c2acffb GP |
1974 | |
1975 | /* Create L2CAP header */ | |
1976 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1977 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1978 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 1979 | |
94122bbe | 1980 | __put_control(chan, 0, skb_put(skb, __ctrl_size(chan))); |
88843ab0 | 1981 | |
c74e560c | 1982 | if (sdulen) |
03a51213 | 1983 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 1984 | |
0952a57a | 1985 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1986 | if (unlikely(err < 0)) { |
1987 | kfree_skb(skb); | |
1988 | return ERR_PTR(err); | |
1989 | } | |
e90bac06 | 1990 | |
47d1ec61 | 1991 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1992 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1993 | |
3ce3514f | 1994 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 1995 | return skb; |
1da177e4 LT |
1996 | } |
1997 | ||
94122bbe MM |
1998 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
1999 | struct sk_buff_head *seg_queue, | |
2000 | struct msghdr *msg, size_t len) | |
c74e560c | 2001 | { |
c74e560c | 2002 | struct sk_buff *skb; |
94122bbe MM |
2003 | u16 sdu_len; |
2004 | size_t pdu_len; | |
2005 | int err = 0; | |
2006 | u8 sar; | |
c74e560c | 2007 | |
94122bbe | 2008 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2009 | |
94122bbe MM |
2010 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2011 | * so fragmented skbs are not used. The HCI layer's handling | |
2012 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2013 | */ | |
c74e560c | 2014 | |
94122bbe MM |
2015 | /* PDU size is derived from the HCI MTU */ |
2016 | pdu_len = chan->conn->mtu; | |
c74e560c | 2017 | |
94122bbe MM |
2018 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2019 | ||
2020 | /* Adjust for largest possible L2CAP overhead. */ | |
2021 | pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE; | |
2022 | ||
2023 | /* Remote device may have requested smaller PDUs */ | |
2024 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2025 | ||
2026 | if (len <= pdu_len) { | |
2027 | sar = L2CAP_SAR_UNSEGMENTED; | |
2028 | sdu_len = 0; | |
2029 | pdu_len = len; | |
2030 | } else { | |
2031 | sar = L2CAP_SAR_START; | |
2032 | sdu_len = len; | |
2033 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2034 | } | |
2035 | ||
2036 | while (len > 0) { | |
2037 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2038 | |
c74e560c | 2039 | if (IS_ERR(skb)) { |
94122bbe | 2040 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2041 | return PTR_ERR(skb); |
2042 | } | |
2043 | ||
94122bbe MM |
2044 | bt_cb(skb)->control.sar = sar; |
2045 | __skb_queue_tail(seg_queue, skb); | |
2046 | ||
2047 | len -= pdu_len; | |
2048 | if (sdu_len) { | |
2049 | sdu_len = 0; | |
2050 | pdu_len += L2CAP_SDULEN_SIZE; | |
2051 | } | |
2052 | ||
2053 | if (len <= pdu_len) { | |
2054 | sar = L2CAP_SAR_END; | |
2055 | pdu_len = len; | |
2056 | } else { | |
2057 | sar = L2CAP_SAR_CONTINUE; | |
2058 | } | |
c74e560c | 2059 | } |
c74e560c | 2060 | |
94122bbe | 2061 | return err; |
c74e560c GP |
2062 | } |
2063 | ||
5e59b791 LAD |
2064 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2065 | u32 priority) | |
9a91a04a | 2066 | { |
9a91a04a | 2067 | struct sk_buff *skb; |
9a91a04a | 2068 | int err; |
94122bbe | 2069 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2070 | |
2071 | /* Connectionless channel */ | |
715ec005 | 2072 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2073 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2074 | if (IS_ERR(skb)) |
2075 | return PTR_ERR(skb); | |
2076 | ||
2077 | l2cap_do_send(chan, skb); | |
2078 | return len; | |
2079 | } | |
2080 | ||
2081 | switch (chan->mode) { | |
2082 | case L2CAP_MODE_BASIC: | |
2083 | /* Check outgoing MTU */ | |
2084 | if (len > chan->omtu) | |
2085 | return -EMSGSIZE; | |
2086 | ||
2087 | /* Create a basic PDU */ | |
5e59b791 | 2088 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2089 | if (IS_ERR(skb)) |
2090 | return PTR_ERR(skb); | |
2091 | ||
2092 | l2cap_do_send(chan, skb); | |
2093 | err = len; | |
2094 | break; | |
2095 | ||
2096 | case L2CAP_MODE_ERTM: | |
2097 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2098 | /* Check outgoing MTU */ |
2099 | if (len > chan->omtu) { | |
2100 | err = -EMSGSIZE; | |
2101 | break; | |
2102 | } | |
9a91a04a | 2103 | |
94122bbe | 2104 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2105 | |
94122bbe MM |
2106 | /* Do segmentation before calling in to the state machine, |
2107 | * since it's possible to block while waiting for memory | |
2108 | * allocation. | |
2109 | */ | |
2110 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2111 | |
94122bbe MM |
2112 | /* The channel could have been closed while segmenting, |
2113 | * check that it is still connected. | |
2114 | */ | |
2115 | if (chan->state != BT_CONNECTED) { | |
2116 | __skb_queue_purge(&seg_queue); | |
2117 | err = -ENOTCONN; | |
9a91a04a GP |
2118 | } |
2119 | ||
94122bbe | 2120 | if (err) |
9a91a04a | 2121 | break; |
9a91a04a | 2122 | |
577cfaeb MM |
2123 | if (chan->mode == L2CAP_MODE_ERTM && chan->tx_send_head == NULL) |
2124 | chan->tx_send_head = seg_queue.next; | |
94122bbe | 2125 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); |
577cfaeb | 2126 | |
94122bbe MM |
2127 | if (chan->mode == L2CAP_MODE_ERTM) |
2128 | err = l2cap_ertm_send(chan); | |
2129 | else | |
2130 | l2cap_streaming_send(chan); | |
9a91a04a | 2131 | |
9a91a04a GP |
2132 | if (err >= 0) |
2133 | err = len; | |
2134 | ||
94122bbe MM |
2135 | /* If the skbs were not queued for sending, they'll still be in |
2136 | * seg_queue and need to be purged. | |
2137 | */ | |
2138 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2139 | break; |
2140 | ||
2141 | default: | |
2142 | BT_DBG("bad state %1.1x", chan->mode); | |
2143 | err = -EBADFD; | |
2144 | } | |
2145 | ||
2146 | return err; | |
2147 | } | |
2148 | ||
1da177e4 LT |
2149 | /* Copy frame to all raw sockets on that connection */ |
2150 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2151 | { | |
1da177e4 | 2152 | struct sk_buff *nskb; |
48454079 | 2153 | struct l2cap_chan *chan; |
1da177e4 LT |
2154 | |
2155 | BT_DBG("conn %p", conn); | |
2156 | ||
3df91ea2 | 2157 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2158 | |
3df91ea2 | 2159 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2160 | struct sock *sk = chan->sk; |
715ec005 | 2161 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2162 | continue; |
2163 | ||
2164 | /* Don't send frame to the socket it came from */ | |
2165 | if (skb->sk == sk) | |
2166 | continue; | |
af05b30b GP |
2167 | nskb = skb_clone(skb, GFP_ATOMIC); |
2168 | if (!nskb) | |
1da177e4 LT |
2169 | continue; |
2170 | ||
23070494 | 2171 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2172 | kfree_skb(nskb); |
2173 | } | |
3d57dc68 | 2174 | |
3df91ea2 | 2175 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2176 | } |
2177 | ||
2178 | /* ---- L2CAP signalling commands ---- */ | |
2179 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2180 | u8 code, u8 ident, u16 dlen, void *data) | |
2181 | { | |
2182 | struct sk_buff *skb, **frag; | |
2183 | struct l2cap_cmd_hdr *cmd; | |
2184 | struct l2cap_hdr *lh; | |
2185 | int len, count; | |
2186 | ||
af05b30b GP |
2187 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2188 | conn, code, ident, dlen); | |
1da177e4 LT |
2189 | |
2190 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2191 | count = min_t(unsigned int, conn->mtu, len); | |
2192 | ||
2193 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2194 | if (!skb) | |
2195 | return NULL; | |
2196 | ||
2197 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2198 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2199 | |
2200 | if (conn->hcon->type == LE_LINK) | |
2201 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
2202 | else | |
2203 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
2204 | |
2205 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2206 | cmd->code = code; | |
2207 | cmd->ident = ident; | |
aca3192c | 2208 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2209 | |
2210 | if (dlen) { | |
2211 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2212 | memcpy(skb_put(skb, count), data, count); | |
2213 | data += count; | |
2214 | } | |
2215 | ||
2216 | len -= skb->len; | |
2217 | ||
2218 | /* Continuation fragments (no L2CAP header) */ | |
2219 | frag = &skb_shinfo(skb)->frag_list; | |
2220 | while (len) { | |
2221 | count = min_t(unsigned int, conn->mtu, len); | |
2222 | ||
2223 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2224 | if (!*frag) | |
2225 | goto fail; | |
2226 | ||
2227 | memcpy(skb_put(*frag, count), data, count); | |
2228 | ||
2229 | len -= count; | |
2230 | data += count; | |
2231 | ||
2232 | frag = &(*frag)->next; | |
2233 | } | |
2234 | ||
2235 | return skb; | |
2236 | ||
2237 | fail: | |
2238 | kfree_skb(skb); | |
2239 | return NULL; | |
2240 | } | |
2241 | ||
2242 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2243 | { | |
2244 | struct l2cap_conf_opt *opt = *ptr; | |
2245 | int len; | |
2246 | ||
2247 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2248 | *ptr += len; | |
2249 | ||
2250 | *type = opt->type; | |
2251 | *olen = opt->len; | |
2252 | ||
2253 | switch (opt->len) { | |
2254 | case 1: | |
2255 | *val = *((u8 *) opt->val); | |
2256 | break; | |
2257 | ||
2258 | case 2: | |
bfaaeb3e | 2259 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2260 | break; |
2261 | ||
2262 | case 4: | |
bfaaeb3e | 2263 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2264 | break; |
2265 | ||
2266 | default: | |
2267 | *val = (unsigned long) opt->val; | |
2268 | break; | |
2269 | } | |
2270 | ||
2271 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2272 | return len; | |
2273 | } | |
2274 | ||
1da177e4 LT |
2275 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2276 | { | |
2277 | struct l2cap_conf_opt *opt = *ptr; | |
2278 | ||
2279 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2280 | ||
2281 | opt->type = type; | |
2282 | opt->len = len; | |
2283 | ||
2284 | switch (len) { | |
2285 | case 1: | |
2286 | *((u8 *) opt->val) = val; | |
2287 | break; | |
2288 | ||
2289 | case 2: | |
4f8b691c | 2290 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2291 | break; |
2292 | ||
2293 | case 4: | |
4f8b691c | 2294 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2295 | break; |
2296 | ||
2297 | default: | |
2298 | memcpy(opt->val, (void *) val, len); | |
2299 | break; | |
2300 | } | |
2301 | ||
2302 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2303 | } | |
2304 | ||
f89cef09 AE |
2305 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2306 | { | |
2307 | struct l2cap_conf_efs efs; | |
2308 | ||
1ec918ce | 2309 | switch (chan->mode) { |
f89cef09 AE |
2310 | case L2CAP_MODE_ERTM: |
2311 | efs.id = chan->local_id; | |
2312 | efs.stype = chan->local_stype; | |
2313 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2314 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2315 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2316 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2317 | break; | |
2318 | ||
2319 | case L2CAP_MODE_STREAMING: | |
2320 | efs.id = 1; | |
2321 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2322 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2323 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2324 | efs.acc_lat = 0; | |
2325 | efs.flush_to = 0; | |
2326 | break; | |
2327 | ||
2328 | default: | |
2329 | return; | |
2330 | } | |
2331 | ||
2332 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2333 | (unsigned long) &efs); | |
2334 | } | |
2335 | ||
721c4181 | 2336 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2337 | { |
721c4181 GP |
2338 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2339 | ack_timer.work); | |
c1b4f43b | 2340 | |
2fb9b3d4 GP |
2341 | BT_DBG("chan %p", chan); |
2342 | ||
6be36555 AE |
2343 | l2cap_chan_lock(chan); |
2344 | ||
b17e73bb | 2345 | __l2cap_send_ack(chan); |
6be36555 AE |
2346 | |
2347 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2348 | |
2349 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2350 | } |
2351 | ||
3c588192 | 2352 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2353 | { |
3c588192 MM |
2354 | int err; |
2355 | ||
105bdf9e MM |
2356 | chan->next_tx_seq = 0; |
2357 | chan->expected_tx_seq = 0; | |
42e5c802 | 2358 | chan->expected_ack_seq = 0; |
6a026610 | 2359 | chan->unacked_frames = 0; |
42e5c802 | 2360 | chan->buffer_seq = 0; |
6a026610 GP |
2361 | chan->num_acked = 0; |
2362 | chan->frames_sent = 0; | |
105bdf9e MM |
2363 | chan->last_acked_seq = 0; |
2364 | chan->sdu = NULL; | |
2365 | chan->sdu_last_frag = NULL; | |
2366 | chan->sdu_len = 0; | |
2367 | ||
d34c34fb MM |
2368 | skb_queue_head_init(&chan->tx_q); |
2369 | ||
105bdf9e MM |
2370 | if (chan->mode != L2CAP_MODE_ERTM) |
2371 | return 0; | |
2372 | ||
2373 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2374 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2375 | |
721c4181 GP |
2376 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2377 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2378 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2379 | |
f1c6775b | 2380 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2381 | |
39d5a3ee | 2382 | INIT_LIST_HEAD(&chan->srej_l); |
3c588192 MM |
2383 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2384 | if (err < 0) | |
2385 | return err; | |
2386 | ||
9dc9affc MM |
2387 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2388 | if (err < 0) | |
2389 | l2cap_seq_list_free(&chan->srej_list); | |
2390 | ||
2391 | return err; | |
0565c1c2 GP |
2392 | } |
2393 | ||
f2fcfcd6 GP |
2394 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2395 | { | |
2396 | switch (mode) { | |
2397 | case L2CAP_MODE_STREAMING: | |
2398 | case L2CAP_MODE_ERTM: | |
2399 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2400 | return mode; | |
2401 | /* fall through */ | |
2402 | default: | |
2403 | return L2CAP_MODE_BASIC; | |
2404 | } | |
2405 | } | |
2406 | ||
6327eb98 AE |
2407 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2408 | { | |
2409 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2410 | } | |
2411 | ||
f89cef09 AE |
2412 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2413 | { | |
2414 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2415 | } | |
2416 | ||
6327eb98 AE |
2417 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2418 | { | |
2419 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2420 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2421 | /* use extended control field */ |
2422 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2423 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2424 | } else { | |
6327eb98 AE |
2425 | chan->tx_win = min_t(u16, chan->tx_win, |
2426 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2427 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2428 | } | |
6327eb98 AE |
2429 | } |
2430 | ||
710f9b0a | 2431 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2432 | { |
1da177e4 | 2433 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2434 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2435 | void *ptr = req->data; |
c8f79162 | 2436 | u16 size; |
1da177e4 | 2437 | |
49208c9c | 2438 | BT_DBG("chan %p", chan); |
1da177e4 | 2439 | |
73ffa904 | 2440 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2441 | goto done; |
2442 | ||
0c1bc5c6 | 2443 | switch (chan->mode) { |
f2fcfcd6 GP |
2444 | case L2CAP_MODE_STREAMING: |
2445 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2446 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2447 | break; |
85eb53c6 | 2448 | |
f89cef09 AE |
2449 | if (__l2cap_efs_supported(chan)) |
2450 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2451 | ||
2ba13ed6 | 2452 | /* fall through */ |
f2fcfcd6 | 2453 | default: |
8c1d787b | 2454 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2455 | break; |
2456 | } | |
2457 | ||
2458 | done: | |
0c1bc5c6 GP |
2459 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2460 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2461 | |
0c1bc5c6 | 2462 | switch (chan->mode) { |
65c7c491 | 2463 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2464 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2465 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2466 | break; |
2467 | ||
62547752 GP |
2468 | rfc.mode = L2CAP_MODE_BASIC; |
2469 | rfc.txwin_size = 0; | |
2470 | rfc.max_transmit = 0; | |
2471 | rfc.retrans_timeout = 0; | |
2472 | rfc.monitor_timeout = 0; | |
2473 | rfc.max_pdu_size = 0; | |
2474 | ||
63406504 GP |
2475 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2476 | (unsigned long) &rfc); | |
65c7c491 MH |
2477 | break; |
2478 | ||
2479 | case L2CAP_MODE_ERTM: | |
2480 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2481 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2482 | rfc.retrans_timeout = 0; |
2483 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2484 | |
2485 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2486 | L2CAP_EXT_HDR_SIZE - | |
2487 | L2CAP_SDULEN_SIZE - | |
2488 | L2CAP_FCS_SIZE); | |
2489 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2490 | |
6327eb98 AE |
2491 | l2cap_txwin_setup(chan); |
2492 | ||
2493 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2494 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2495 | |
63406504 GP |
2496 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2497 | (unsigned long) &rfc); | |
2498 | ||
f89cef09 AE |
2499 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2500 | l2cap_add_opt_efs(&ptr, chan); | |
2501 | ||
8c1d787b | 2502 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2503 | break; |
2504 | ||
47d1ec61 | 2505 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2506 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2507 | chan->fcs = L2CAP_FCS_NONE; |
2508 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2509 | } |
6327eb98 AE |
2510 | |
2511 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2512 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2513 | chan->tx_win); | |
f2fcfcd6 GP |
2514 | break; |
2515 | ||
2516 | case L2CAP_MODE_STREAMING: | |
2517 | rfc.mode = L2CAP_MODE_STREAMING; | |
2518 | rfc.txwin_size = 0; | |
2519 | rfc.max_transmit = 0; | |
2520 | rfc.retrans_timeout = 0; | |
2521 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2522 | |
2523 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2524 | L2CAP_EXT_HDR_SIZE - | |
2525 | L2CAP_SDULEN_SIZE - | |
2526 | L2CAP_FCS_SIZE); | |
2527 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2528 | |
63406504 GP |
2529 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2530 | (unsigned long) &rfc); | |
2531 | ||
f89cef09 AE |
2532 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2533 | l2cap_add_opt_efs(&ptr, chan); | |
2534 | ||
8c1d787b | 2535 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2536 | break; |
2537 | ||
47d1ec61 | 2538 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2539 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2540 | chan->fcs = L2CAP_FCS_NONE; |
2541 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2542 | } |
65c7c491 MH |
2543 | break; |
2544 | } | |
1da177e4 | 2545 | |
fe4128e0 | 2546 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2547 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2548 | |
2549 | return ptr - data; | |
2550 | } | |
2551 | ||
73ffa904 | 2552 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2553 | { |
5dee9e7c MH |
2554 | struct l2cap_conf_rsp *rsp = data; |
2555 | void *ptr = rsp->data; | |
73ffa904 GP |
2556 | void *req = chan->conf_req; |
2557 | int len = chan->conf_len; | |
5dee9e7c MH |
2558 | int type, hint, olen; |
2559 | unsigned long val; | |
6464f35f | 2560 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2561 | struct l2cap_conf_efs efs; |
2562 | u8 remote_efs = 0; | |
861d6882 | 2563 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2564 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2565 | u16 size; |
1da177e4 | 2566 | |
73ffa904 | 2567 | BT_DBG("chan %p", chan); |
820ae1b8 | 2568 | |
5dee9e7c MH |
2569 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2570 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2571 | |
589d2746 | 2572 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2573 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2574 | |
2575 | switch (type) { | |
2576 | case L2CAP_CONF_MTU: | |
861d6882 | 2577 | mtu = val; |
5dee9e7c MH |
2578 | break; |
2579 | ||
2580 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2581 | chan->flush_to = val; |
5dee9e7c MH |
2582 | break; |
2583 | ||
2584 | case L2CAP_CONF_QOS: | |
2585 | break; | |
2586 | ||
6464f35f MH |
2587 | case L2CAP_CONF_RFC: |
2588 | if (olen == sizeof(rfc)) | |
2589 | memcpy(&rfc, (void *) val, olen); | |
2590 | break; | |
2591 | ||
fcc203c3 GP |
2592 | case L2CAP_CONF_FCS: |
2593 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2594 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2595 | break; |
fcc203c3 | 2596 | |
42dceae2 AE |
2597 | case L2CAP_CONF_EFS: |
2598 | remote_efs = 1; | |
2599 | if (olen == sizeof(efs)) | |
2600 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2601 | break; |
2602 | ||
6327eb98 AE |
2603 | case L2CAP_CONF_EWS: |
2604 | if (!enable_hs) | |
2605 | return -ECONNREFUSED; | |
fcc203c3 | 2606 | |
6327eb98 AE |
2607 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2608 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2609 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2610 | chan->remote_tx_win = val; |
fcc203c3 GP |
2611 | break; |
2612 | ||
5dee9e7c MH |
2613 | default: |
2614 | if (hint) | |
2615 | break; | |
2616 | ||
2617 | result = L2CAP_CONF_UNKNOWN; | |
2618 | *((u8 *) ptr++) = type; | |
2619 | break; | |
2620 | } | |
2621 | } | |
2622 | ||
73ffa904 | 2623 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2624 | goto done; |
2625 | ||
0c1bc5c6 | 2626 | switch (chan->mode) { |
f2fcfcd6 GP |
2627 | case L2CAP_MODE_STREAMING: |
2628 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2629 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2630 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2631 | chan->conn->feat_mask); |
85eb53c6 GP |
2632 | break; |
2633 | } | |
2634 | ||
42dceae2 AE |
2635 | if (remote_efs) { |
2636 | if (__l2cap_efs_supported(chan)) | |
2637 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2638 | else | |
2639 | return -ECONNREFUSED; | |
2640 | } | |
2641 | ||
0c1bc5c6 | 2642 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2643 | return -ECONNREFUSED; |
742e519b | 2644 | |
f2fcfcd6 | 2645 | break; |
f2fcfcd6 GP |
2646 | } |
2647 | ||
2648 | done: | |
0c1bc5c6 | 2649 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2650 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2651 | rfc.mode = chan->mode; |
f2fcfcd6 | 2652 | |
73ffa904 | 2653 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2654 | return -ECONNREFUSED; |
2655 | ||
2656 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2657 | sizeof(rfc), (unsigned long) &rfc); | |
2658 | } | |
2659 | ||
5dee9e7c MH |
2660 | if (result == L2CAP_CONF_SUCCESS) { |
2661 | /* Configure output options and let the other side know | |
2662 | * which ones we don't like. */ | |
2663 | ||
f2fcfcd6 GP |
2664 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2665 | result = L2CAP_CONF_UNACCEPT; | |
2666 | else { | |
0c1bc5c6 | 2667 | chan->omtu = mtu; |
c1360a1c | 2668 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2669 | } |
0c1bc5c6 | 2670 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2671 | |
42dceae2 AE |
2672 | if (remote_efs) { |
2673 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2674 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2675 | efs.stype != chan->local_stype) { | |
2676 | ||
2677 | result = L2CAP_CONF_UNACCEPT; | |
2678 | ||
2679 | if (chan->num_conf_req >= 1) | |
2680 | return -ECONNREFUSED; | |
2681 | ||
2682 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2683 | sizeof(efs), |
42dceae2 | 2684 | (unsigned long) &efs); |
0e8b207e | 2685 | } else { |
3e6b3b95 | 2686 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2687 | result = L2CAP_CONF_PENDING; |
2688 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2689 | } |
2690 | } | |
2691 | ||
f2fcfcd6 GP |
2692 | switch (rfc.mode) { |
2693 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2694 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2695 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2696 | break; |
2697 | ||
2698 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2699 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2700 | chan->remote_tx_win = rfc.txwin_size; | |
2701 | else | |
2702 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2703 | |
2c03a7a4 | 2704 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2705 | |
c8f79162 AE |
2706 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2707 | chan->conn->mtu - | |
2708 | L2CAP_EXT_HDR_SIZE - | |
2709 | L2CAP_SDULEN_SIZE - | |
2710 | L2CAP_FCS_SIZE); | |
2711 | rfc.max_pdu_size = cpu_to_le16(size); | |
2712 | chan->remote_mps = size; | |
f2fcfcd6 | 2713 | |
10467e9e | 2714 | rfc.retrans_timeout = |
4fd21a88 | 2715 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 2716 | rfc.monitor_timeout = |
4fd21a88 | 2717 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 2718 | |
c1360a1c | 2719 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2720 | |
2721 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2722 | sizeof(rfc), (unsigned long) &rfc); | |
2723 | ||
42dceae2 AE |
2724 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2725 | chan->remote_id = efs.id; | |
2726 | chan->remote_stype = efs.stype; | |
2727 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2728 | chan->remote_flush_to = | |
2729 | le32_to_cpu(efs.flush_to); | |
2730 | chan->remote_acc_lat = | |
2731 | le32_to_cpu(efs.acc_lat); | |
2732 | chan->remote_sdu_itime = | |
2733 | le32_to_cpu(efs.sdu_itime); | |
2734 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2735 | sizeof(efs), (unsigned long) &efs); | |
2736 | } | |
f2fcfcd6 GP |
2737 | break; |
2738 | ||
2739 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2740 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2741 | chan->conn->mtu - | |
2742 | L2CAP_EXT_HDR_SIZE - | |
2743 | L2CAP_SDULEN_SIZE - | |
2744 | L2CAP_FCS_SIZE); | |
2745 | rfc.max_pdu_size = cpu_to_le16(size); | |
2746 | chan->remote_mps = size; | |
f2fcfcd6 | 2747 | |
c1360a1c | 2748 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2749 | |
2750 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2751 | sizeof(rfc), (unsigned long) &rfc); | |
2752 | ||
f2fcfcd6 GP |
2753 | break; |
2754 | ||
2755 | default: | |
5dee9e7c | 2756 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2757 | |
6464f35f | 2758 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2759 | rfc.mode = chan->mode; |
f2fcfcd6 | 2760 | } |
6464f35f | 2761 | |
f2fcfcd6 | 2762 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2763 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2764 | } |
fe4128e0 | 2765 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2766 | rsp->result = cpu_to_le16(result); |
2767 | rsp->flags = cpu_to_le16(0x0000); | |
2768 | ||
2769 | return ptr - data; | |
1da177e4 LT |
2770 | } |
2771 | ||
b4450035 | 2772 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2773 | { |
f2fcfcd6 GP |
2774 | struct l2cap_conf_req *req = data; |
2775 | void *ptr = req->data; | |
2776 | int type, olen; | |
2777 | unsigned long val; | |
36e999a8 | 2778 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 2779 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2780 | |
fe4128e0 | 2781 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2782 | |
2783 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2784 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2785 | ||
2786 | switch (type) { | |
2787 | case L2CAP_CONF_MTU: | |
2788 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2789 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2790 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2791 | } else |
0c1bc5c6 GP |
2792 | chan->imtu = val; |
2793 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2794 | break; |
2795 | ||
2796 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2797 | chan->flush_to = val; |
f2fcfcd6 | 2798 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2799 | 2, chan->flush_to); |
f2fcfcd6 GP |
2800 | break; |
2801 | ||
2802 | case L2CAP_CONF_RFC: | |
2803 | if (olen == sizeof(rfc)) | |
2804 | memcpy(&rfc, (void *)val, olen); | |
2805 | ||
c1360a1c | 2806 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2807 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2808 | return -ECONNREFUSED; |
2809 | ||
47d1ec61 | 2810 | chan->fcs = 0; |
f2fcfcd6 GP |
2811 | |
2812 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2813 | sizeof(rfc), (unsigned long) &rfc); | |
2814 | break; | |
6327eb98 AE |
2815 | |
2816 | case L2CAP_CONF_EWS: | |
2817 | chan->tx_win = min_t(u16, val, | |
2818 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2819 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2820 | chan->tx_win); | |
6327eb98 | 2821 | break; |
66af7aaf AE |
2822 | |
2823 | case L2CAP_CONF_EFS: | |
2824 | if (olen == sizeof(efs)) | |
2825 | memcpy(&efs, (void *)val, olen); | |
2826 | ||
2827 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2828 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2829 | efs.stype != chan->local_stype) | |
2830 | return -ECONNREFUSED; | |
2831 | ||
2832 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2833 | sizeof(efs), (unsigned long) &efs); | |
2834 | break; | |
f2fcfcd6 GP |
2835 | } |
2836 | } | |
2837 | ||
0c1bc5c6 | 2838 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2839 | return -ECONNREFUSED; |
2840 | ||
0c1bc5c6 | 2841 | chan->mode = rfc.mode; |
6c2ea7a8 | 2842 | |
0e8b207e | 2843 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2844 | switch (rfc.mode) { |
2845 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2846 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2847 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2848 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2849 | |
2850 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2851 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2852 | chan->local_sdu_itime = | |
2853 | le32_to_cpu(efs.sdu_itime); | |
2854 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2855 | chan->local_flush_to = | |
2856 | le32_to_cpu(efs.flush_to); | |
2857 | } | |
f2fcfcd6 | 2858 | break; |
66af7aaf | 2859 | |
f2fcfcd6 | 2860 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2861 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2862 | } |
2863 | } | |
2864 | ||
fe4128e0 | 2865 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2866 | req->flags = cpu_to_le16(0x0000); |
2867 | ||
2868 | return ptr - data; | |
2869 | } | |
2870 | ||
fe4128e0 | 2871 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2872 | { |
2873 | struct l2cap_conf_rsp *rsp = data; | |
2874 | void *ptr = rsp->data; | |
1da177e4 | 2875 | |
fe4128e0 | 2876 | BT_DBG("chan %p", chan); |
1da177e4 | 2877 | |
fe4128e0 | 2878 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2879 | rsp->result = cpu_to_le16(result); |
aca3192c | 2880 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2881 | |
2882 | return ptr - data; | |
2883 | } | |
2884 | ||
8c1d787b | 2885 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2886 | { |
2887 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2888 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2889 | u8 buf[128]; |
2890 | ||
fe4128e0 GP |
2891 | rsp.scid = cpu_to_le16(chan->dcid); |
2892 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2893 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2894 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2895 | l2cap_send_cmd(conn, chan->ident, | |
2896 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2897 | ||
c1360a1c | 2898 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2899 | return; |
2900 | ||
710f9b0a GP |
2901 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2902 | l2cap_build_conf_req(chan, buf), buf); | |
2903 | chan->num_conf_req++; | |
2904 | } | |
2905 | ||
47d1ec61 | 2906 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2907 | { |
7b1c0049 GP |
2908 | int type, olen; |
2909 | unsigned long val; | |
2910 | struct l2cap_conf_rfc rfc; | |
2911 | ||
47d1ec61 | 2912 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2913 | |
0c1bc5c6 | 2914 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2915 | return; |
2916 | ||
2917 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2918 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2919 | ||
2920 | switch (type) { | |
2921 | case L2CAP_CONF_RFC: | |
2922 | if (olen == sizeof(rfc)) | |
2923 | memcpy(&rfc, (void *)val, olen); | |
2924 | goto done; | |
2925 | } | |
2926 | } | |
2927 | ||
36e999a8 MM |
2928 | /* Use sane default values in case a misbehaving remote device |
2929 | * did not send an RFC option. | |
2930 | */ | |
2931 | rfc.mode = chan->mode; | |
2932 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
2933 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
2934 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
2935 | ||
2936 | BT_ERR("Expected RFC option was not found, using defaults"); | |
2937 | ||
7b1c0049 GP |
2938 | done: |
2939 | switch (rfc.mode) { | |
2940 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2941 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2942 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2943 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2944 | break; |
2945 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2946 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2947 | } |
2948 | } | |
2949 | ||
4e8402a3 MH |
2950 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2951 | { | |
e2fd318e | 2952 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2953 | |
e2fd318e | 2954 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2955 | return 0; |
2956 | ||
2957 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2958 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 2959 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
2960 | |
2961 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2962 | conn->info_ident = 0; |
984947dc | 2963 | |
4e8402a3 MH |
2964 | l2cap_conn_start(conn); |
2965 | } | |
2966 | ||
2967 | return 0; | |
2968 | } | |
2969 | ||
1da177e4 LT |
2970 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2971 | { | |
1da177e4 LT |
2972 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2973 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2974 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2975 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2976 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2977 | |
2978 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2979 | __le16 psm = req->psm; |
1da177e4 | 2980 | |
097db76c | 2981 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
2982 | |
2983 | /* Check if we have socket listening on psm */ | |
c2287681 | 2984 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 2985 | if (!pchan) { |
1da177e4 LT |
2986 | result = L2CAP_CR_BAD_PSM; |
2987 | goto sendresp; | |
2988 | } | |
2989 | ||
23691d75 GP |
2990 | parent = pchan->sk; |
2991 | ||
3df91ea2 | 2992 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 2993 | lock_sock(parent); |
e0f0cb56 | 2994 | |
e7c29cb1 MH |
2995 | /* Check if the ACL is secure enough (if not SDP) */ |
2996 | if (psm != cpu_to_le16(0x0001) && | |
2997 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2998 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2999 | result = L2CAP_CR_SEC_BLOCK; |
3000 | goto response; | |
3001 | } | |
3002 | ||
1da177e4 LT |
3003 | result = L2CAP_CR_NO_MEM; |
3004 | ||
3005 | /* Check for backlog size */ | |
3006 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 3007 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
3008 | goto response; |
3009 | } | |
3010 | ||
80808e43 GP |
3011 | chan = pchan->ops->new_connection(pchan->data); |
3012 | if (!chan) | |
1da177e4 LT |
3013 | goto response; |
3014 | ||
80808e43 GP |
3015 | sk = chan->sk; |
3016 | ||
1da177e4 | 3017 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3018 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3019 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3020 | chan->ops->close(chan->data); |
1da177e4 LT |
3021 | goto response; |
3022 | } | |
3023 | ||
3024 | hci_conn_hold(conn->hcon); | |
3025 | ||
1da177e4 LT |
3026 | bacpy(&bt_sk(sk)->src, conn->src); |
3027 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3028 | chan->psm = psm; |
3029 | chan->dcid = scid; | |
1da177e4 | 3030 | |
d1010240 GP |
3031 | bt_accept_enqueue(parent, sk); |
3032 | ||
6be36555 | 3033 | __l2cap_chan_add(conn, chan); |
48454079 | 3034 | |
fe4128e0 | 3035 | dcid = chan->scid; |
1da177e4 | 3036 | |
c9b66675 | 3037 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3038 | |
fc7f8a7e | 3039 | chan->ident = cmd->ident; |
1da177e4 | 3040 | |
984947dc | 3041 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3042 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3043 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3044 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3045 | result = L2CAP_CR_PEND; |
3046 | status = L2CAP_CS_AUTHOR_PEND; | |
3047 | parent->sk_data_ready(parent, 0); | |
3048 | } else { | |
0e587be7 | 3049 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3050 | result = L2CAP_CR_SUCCESS; |
3051 | status = L2CAP_CS_NO_INFO; | |
3052 | } | |
79d554a6 | 3053 | } else { |
0e587be7 | 3054 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3055 | result = L2CAP_CR_PEND; |
3056 | status = L2CAP_CS_AUTHEN_PEND; | |
3057 | } | |
3058 | } else { | |
0e587be7 | 3059 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3060 | result = L2CAP_CR_PEND; |
3061 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3062 | } |
3063 | ||
1da177e4 | 3064 | response: |
aa2ac881 | 3065 | release_sock(parent); |
3df91ea2 | 3066 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3067 | |
3068 | sendresp: | |
aca3192c YH |
3069 | rsp.scid = cpu_to_le16(scid); |
3070 | rsp.dcid = cpu_to_le16(dcid); | |
3071 | rsp.result = cpu_to_le16(result); | |
3072 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3073 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3074 | |
3075 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3076 | struct l2cap_info_req info; | |
3077 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3078 | ||
3079 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3080 | conn->info_ident = l2cap_get_ident(conn); | |
3081 | ||
ba13ccd9 | 3082 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3083 | |
3084 | l2cap_send_cmd(conn, conn->info_ident, | |
3085 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3086 | } | |
3087 | ||
c1360a1c | 3088 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3089 | result == L2CAP_CR_SUCCESS) { |
3090 | u8 buf[128]; | |
c1360a1c | 3091 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3092 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3093 | l2cap_build_conf_req(chan, buf), buf); |
3094 | chan->num_conf_req++; | |
e9aeb2dd GP |
3095 | } |
3096 | ||
1da177e4 LT |
3097 | return 0; |
3098 | } | |
3099 | ||
3100 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3101 | { | |
3102 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3103 | u16 scid, dcid, result, status; | |
48454079 | 3104 | struct l2cap_chan *chan; |
1da177e4 | 3105 | u8 req[128]; |
3df91ea2 | 3106 | int err; |
1da177e4 LT |
3107 | |
3108 | scid = __le16_to_cpu(rsp->scid); | |
3109 | dcid = __le16_to_cpu(rsp->dcid); | |
3110 | result = __le16_to_cpu(rsp->result); | |
3111 | status = __le16_to_cpu(rsp->status); | |
3112 | ||
1b009c98 AE |
3113 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3114 | dcid, scid, result, status); | |
1da177e4 | 3115 | |
3df91ea2 AE |
3116 | mutex_lock(&conn->chan_lock); |
3117 | ||
1da177e4 | 3118 | if (scid) { |
3df91ea2 AE |
3119 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3120 | if (!chan) { | |
3121 | err = -EFAULT; | |
3122 | goto unlock; | |
3123 | } | |
1da177e4 | 3124 | } else { |
3df91ea2 AE |
3125 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3126 | if (!chan) { | |
3127 | err = -EFAULT; | |
3128 | goto unlock; | |
3129 | } | |
1da177e4 LT |
3130 | } |
3131 | ||
3df91ea2 AE |
3132 | err = 0; |
3133 | ||
6be36555 | 3134 | l2cap_chan_lock(chan); |
48454079 | 3135 | |
1da177e4 LT |
3136 | switch (result) { |
3137 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3138 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3139 | chan->ident = 0; |
fe4128e0 | 3140 | chan->dcid = dcid; |
c1360a1c | 3141 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3142 | |
c1360a1c | 3143 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3144 | break; |
3145 | ||
1da177e4 | 3146 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3147 | l2cap_build_conf_req(chan, req), req); |
3148 | chan->num_conf_req++; | |
1da177e4 LT |
3149 | break; |
3150 | ||
3151 | case L2CAP_CR_PEND: | |
c1360a1c | 3152 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3153 | break; |
3154 | ||
3155 | default: | |
48454079 | 3156 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3157 | break; |
3158 | } | |
3159 | ||
6be36555 | 3160 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3161 | |
3162 | unlock: | |
3163 | mutex_unlock(&conn->chan_lock); | |
3164 | ||
3165 | return err; | |
1da177e4 LT |
3166 | } |
3167 | ||
47d1ec61 | 3168 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3169 | { |
3170 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3171 | * sides request it. | |
3172 | */ | |
0c1bc5c6 | 3173 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3174 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3175 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3176 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3177 | } |
3178 | ||
88219a0f | 3179 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3180 | { |
3181 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3182 | u16 dcid, flags; | |
3183 | u8 rsp[64]; | |
48454079 | 3184 | struct l2cap_chan *chan; |
3c588192 | 3185 | int len, err = 0; |
1da177e4 LT |
3186 | |
3187 | dcid = __le16_to_cpu(req->dcid); | |
3188 | flags = __le16_to_cpu(req->flags); | |
3189 | ||
3190 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3191 | ||
baa7e1fa | 3192 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3193 | if (!chan) |
1da177e4 LT |
3194 | return -ENOENT; |
3195 | ||
033b1142 | 3196 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3197 | struct l2cap_cmd_rej_cid rej; |
3198 | ||
3199 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3200 | rej.scid = cpu_to_le16(chan->scid); | |
3201 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3202 | |
df6bd743 GP |
3203 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3204 | sizeof(rej), &rej); | |
354f60a9 | 3205 | goto unlock; |
df6bd743 | 3206 | } |
354f60a9 | 3207 | |
5dee9e7c | 3208 | /* Reject if config buffer is too small. */ |
88219a0f | 3209 | len = cmd_len - sizeof(*req); |
7ac28817 | 3210 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3211 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3212 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3213 | L2CAP_CONF_REJECT, flags), rsp); |
3214 | goto unlock; | |
3215 | } | |
3216 | ||
3217 | /* Store config. */ | |
73ffa904 GP |
3218 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3219 | chan->conf_len += len; | |
1da177e4 LT |
3220 | |
3221 | if (flags & 0x0001) { | |
3222 | /* Incomplete config. Send empty response. */ | |
3223 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3224 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 3225 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
3226 | goto unlock; |
3227 | } | |
3228 | ||
3229 | /* Complete config. */ | |
73ffa904 | 3230 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3231 | if (len < 0) { |
e92c8e70 | 3232 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3233 | goto unlock; |
f2fcfcd6 | 3234 | } |
1da177e4 | 3235 | |
5dee9e7c | 3236 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3237 | chan->num_conf_rsp++; |
5dee9e7c | 3238 | |
5dee9e7c | 3239 | /* Reset config buffer. */ |
73ffa904 | 3240 | chan->conf_len = 0; |
5dee9e7c | 3241 | |
c1360a1c | 3242 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3243 | goto unlock; |
3244 | ||
c1360a1c | 3245 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3246 | set_default_fcs(chan); |
fcc203c3 | 3247 | |
89bc500e | 3248 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 3249 | |
105bdf9e MM |
3250 | if (chan->mode == L2CAP_MODE_ERTM || |
3251 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3252 | err = l2cap_ertm_init(chan); |
3253 | ||
3254 | if (err < 0) | |
3255 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3256 | else | |
3257 | l2cap_chan_ready(chan); | |
0565c1c2 | 3258 | |
876d9484 MH |
3259 | goto unlock; |
3260 | } | |
3261 | ||
c1360a1c | 3262 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3263 | u8 buf[64]; |
1da177e4 | 3264 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3265 | l2cap_build_conf_req(chan, buf), buf); |
3266 | chan->num_conf_req++; | |
1da177e4 LT |
3267 | } |
3268 | ||
0e8b207e AE |
3269 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3270 | Conf Rsp PENDING in the code above */ | |
3271 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3272 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3273 | ||
3274 | /* check compatibility */ | |
3275 | ||
3276 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3277 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3278 | ||
3279 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3280 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
3281 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
3282 | } | |
3283 | ||
1da177e4 | 3284 | unlock: |
6be36555 | 3285 | l2cap_chan_unlock(chan); |
3c588192 | 3286 | return err; |
1da177e4 LT |
3287 | } |
3288 | ||
3289 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3290 | { | |
3291 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3292 | u16 scid, flags, result; | |
48454079 | 3293 | struct l2cap_chan *chan; |
61386cba | 3294 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3295 | int err = 0; |
1da177e4 LT |
3296 | |
3297 | scid = __le16_to_cpu(rsp->scid); | |
3298 | flags = __le16_to_cpu(rsp->flags); | |
3299 | result = __le16_to_cpu(rsp->result); | |
3300 | ||
61386cba AE |
3301 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3302 | result, len); | |
1da177e4 | 3303 | |
baa7e1fa | 3304 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3305 | if (!chan) |
1da177e4 LT |
3306 | return 0; |
3307 | ||
3308 | switch (result) { | |
3309 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3310 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3311 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3312 | break; |
3313 | ||
0e8b207e AE |
3314 | case L2CAP_CONF_PENDING: |
3315 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3316 | ||
3317 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3318 | char buf[64]; | |
3319 | ||
3320 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3321 | buf, &result); | |
3322 | if (len < 0) { | |
3323 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3324 | goto done; | |
3325 | } | |
3326 | ||
3327 | /* check compatibility */ | |
3328 | ||
3329 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3330 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3331 | ||
3332 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3333 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3334 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3335 | } | |
3336 | goto done; | |
3337 | ||
1da177e4 | 3338 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3339 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3340 | char req[64]; |
3341 | ||
c2c77ec8 | 3342 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3343 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3344 | goto done; |
3345 | } | |
3346 | ||
f2fcfcd6 GP |
3347 | /* throw out any old stored conf requests */ |
3348 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3349 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3350 | req, &result); | |
f2fcfcd6 | 3351 | if (len < 0) { |
e92c8e70 | 3352 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3353 | goto done; |
3354 | } | |
3355 | ||
3356 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3357 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3358 | chan->num_conf_req++; |
f2fcfcd6 GP |
3359 | if (result != L2CAP_CONF_SUCCESS) |
3360 | goto done; | |
3361 | break; | |
1da177e4 LT |
3362 | } |
3363 | ||
8e87d142 | 3364 | default: |
6be36555 | 3365 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3366 | |
ba13ccd9 | 3367 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3368 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3369 | goto done; |
3370 | } | |
3371 | ||
3372 | if (flags & 0x01) | |
3373 | goto done; | |
3374 | ||
c1360a1c | 3375 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3376 | |
c1360a1c | 3377 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3378 | set_default_fcs(chan); |
fcc203c3 | 3379 | |
89bc500e | 3380 | l2cap_state_change(chan, BT_CONNECTED); |
105bdf9e MM |
3381 | if (chan->mode == L2CAP_MODE_ERTM || |
3382 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3383 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3384 | |
3c588192 MM |
3385 | if (err < 0) |
3386 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3387 | else | |
3388 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3389 | } |
3390 | ||
3391 | done: | |
6be36555 | 3392 | l2cap_chan_unlock(chan); |
3c588192 | 3393 | return err; |
1da177e4 LT |
3394 | } |
3395 | ||
3396 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3397 | { | |
3398 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3399 | struct l2cap_disconn_rsp rsp; | |
3400 | u16 dcid, scid; | |
48454079 | 3401 | struct l2cap_chan *chan; |
1da177e4 LT |
3402 | struct sock *sk; |
3403 | ||
3404 | scid = __le16_to_cpu(req->scid); | |
3405 | dcid = __le16_to_cpu(req->dcid); | |
3406 | ||
3407 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3408 | ||
3df91ea2 AE |
3409 | mutex_lock(&conn->chan_lock); |
3410 | ||
3411 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3412 | if (!chan) { | |
3413 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3414 | return 0; |
3df91ea2 | 3415 | } |
1da177e4 | 3416 | |
6be36555 AE |
3417 | l2cap_chan_lock(chan); |
3418 | ||
48454079 GP |
3419 | sk = chan->sk; |
3420 | ||
fe4128e0 GP |
3421 | rsp.dcid = cpu_to_le16(chan->scid); |
3422 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3423 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3424 | ||
6be36555 | 3425 | lock_sock(sk); |
1da177e4 | 3426 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3427 | release_sock(sk); |
1da177e4 | 3428 | |
61d6ef3e | 3429 | l2cap_chan_hold(chan); |
48454079 | 3430 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3431 | |
3432 | l2cap_chan_unlock(chan); | |
1da177e4 | 3433 | |
ba3bd0ee | 3434 | chan->ops->close(chan->data); |
61d6ef3e | 3435 | l2cap_chan_put(chan); |
3df91ea2 AE |
3436 | |
3437 | mutex_unlock(&conn->chan_lock); | |
3438 | ||
1da177e4 LT |
3439 | return 0; |
3440 | } | |
3441 | ||
3442 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3443 | { | |
3444 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3445 | u16 dcid, scid; | |
48454079 | 3446 | struct l2cap_chan *chan; |
1da177e4 LT |
3447 | |
3448 | scid = __le16_to_cpu(rsp->scid); | |
3449 | dcid = __le16_to_cpu(rsp->dcid); | |
3450 | ||
3451 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3452 | ||
3df91ea2 AE |
3453 | mutex_lock(&conn->chan_lock); |
3454 | ||
3455 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3456 | if (!chan) { | |
3457 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3458 | return 0; |
3df91ea2 | 3459 | } |
1da177e4 | 3460 | |
6be36555 | 3461 | l2cap_chan_lock(chan); |
48454079 | 3462 | |
61d6ef3e | 3463 | l2cap_chan_hold(chan); |
48454079 | 3464 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3465 | |
3466 | l2cap_chan_unlock(chan); | |
1da177e4 | 3467 | |
ba3bd0ee | 3468 | chan->ops->close(chan->data); |
61d6ef3e | 3469 | l2cap_chan_put(chan); |
3df91ea2 AE |
3470 | |
3471 | mutex_unlock(&conn->chan_lock); | |
3472 | ||
1da177e4 LT |
3473 | return 0; |
3474 | } | |
3475 | ||
3476 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3477 | { | |
3478 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3479 | u16 type; |
3480 | ||
3481 | type = __le16_to_cpu(req->type); | |
3482 | ||
3483 | BT_DBG("type 0x%4.4x", type); | |
3484 | ||
f0709e03 MH |
3485 | if (type == L2CAP_IT_FEAT_MASK) { |
3486 | u8 buf[8]; | |
44dd46de | 3487 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3488 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3489 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3490 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3491 | if (!disable_ertm) |
fcc203c3 GP |
3492 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3493 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3494 | if (enable_hs) |
6327eb98 AE |
3495 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3496 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3497 | |
1b7bf4ed | 3498 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3499 | l2cap_send_cmd(conn, cmd->ident, |
3500 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3501 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3502 | u8 buf[12]; | |
3503 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3504 | |
3505 | if (enable_hs) | |
3506 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3507 | else | |
3508 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3509 | ||
e1027a7c MH |
3510 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3511 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3512 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3513 | l2cap_send_cmd(conn, cmd->ident, |
3514 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3515 | } else { |
3516 | struct l2cap_info_rsp rsp; | |
3517 | rsp.type = cpu_to_le16(type); | |
3518 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3519 | l2cap_send_cmd(conn, cmd->ident, | |
3520 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3521 | } | |
1da177e4 LT |
3522 | |
3523 | return 0; | |
3524 | } | |
3525 | ||
3526 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3527 | { | |
3528 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3529 | u16 type, result; | |
3530 | ||
3531 | type = __le16_to_cpu(rsp->type); | |
3532 | result = __le16_to_cpu(rsp->result); | |
3533 | ||
3534 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3535 | ||
e90165be AE |
3536 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3537 | if (cmd->ident != conn->info_ident || | |
3538 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3539 | return 0; | |
3540 | ||
17cd3f37 | 3541 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3542 | |
adb08ede VT |
3543 | if (result != L2CAP_IR_SUCCESS) { |
3544 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3545 | conn->info_ident = 0; | |
3546 | ||
3547 | l2cap_conn_start(conn); | |
3548 | ||
3549 | return 0; | |
3550 | } | |
3551 | ||
978c93b9 AE |
3552 | switch (type) { |
3553 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3554 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3555 | |
47ec1dcd | 3556 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3557 | struct l2cap_info_req req; |
3558 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3559 | ||
3560 | conn->info_ident = l2cap_get_ident(conn); | |
3561 | ||
3562 | l2cap_send_cmd(conn, conn->info_ident, | |
3563 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3564 | } else { | |
3565 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3566 | conn->info_ident = 0; | |
3567 | ||
3568 | l2cap_conn_start(conn); | |
3569 | } | |
978c93b9 AE |
3570 | break; |
3571 | ||
3572 | case L2CAP_IT_FIXED_CHAN: | |
3573 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3574 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3575 | conn->info_ident = 0; |
984947dc MH |
3576 | |
3577 | l2cap_conn_start(conn); | |
978c93b9 | 3578 | break; |
984947dc | 3579 | } |
4e8402a3 | 3580 | |
1da177e4 LT |
3581 | return 0; |
3582 | } | |
3583 | ||
f94ff6ff MM |
3584 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3585 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3586 | void *data) | |
3587 | { | |
3588 | struct l2cap_create_chan_req *req = data; | |
3589 | struct l2cap_create_chan_rsp rsp; | |
3590 | u16 psm, scid; | |
3591 | ||
3592 | if (cmd_len != sizeof(*req)) | |
3593 | return -EPROTO; | |
3594 | ||
3595 | if (!enable_hs) | |
3596 | return -EINVAL; | |
3597 | ||
3598 | psm = le16_to_cpu(req->psm); | |
3599 | scid = le16_to_cpu(req->scid); | |
3600 | ||
3601 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3602 | ||
3603 | /* Placeholder: Always reject */ | |
3604 | rsp.dcid = 0; | |
3605 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3606 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3607 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3608 | |
3609 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3610 | sizeof(rsp), &rsp); | |
3611 | ||
3612 | return 0; | |
3613 | } | |
3614 | ||
3615 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3616 | struct l2cap_cmd_hdr *cmd, void *data) | |
3617 | { | |
3618 | BT_DBG("conn %p", conn); | |
3619 | ||
3620 | return l2cap_connect_rsp(conn, cmd, data); | |
3621 | } | |
3622 | ||
8d5a04a1 MM |
3623 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3624 | u16 icid, u16 result) | |
3625 | { | |
3626 | struct l2cap_move_chan_rsp rsp; | |
3627 | ||
3628 | BT_DBG("icid %d, result %d", icid, result); | |
3629 | ||
3630 | rsp.icid = cpu_to_le16(icid); | |
3631 | rsp.result = cpu_to_le16(result); | |
3632 | ||
3633 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3634 | } | |
3635 | ||
3636 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3637 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3638 | { | |
3639 | struct l2cap_move_chan_cfm cfm; | |
3640 | u8 ident; | |
3641 | ||
3642 | BT_DBG("icid %d, result %d", icid, result); | |
3643 | ||
3644 | ident = l2cap_get_ident(conn); | |
3645 | if (chan) | |
3646 | chan->ident = ident; | |
3647 | ||
3648 | cfm.icid = cpu_to_le16(icid); | |
3649 | cfm.result = cpu_to_le16(result); | |
3650 | ||
3651 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3652 | } | |
3653 | ||
3654 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3655 | u16 icid) | |
3656 | { | |
3657 | struct l2cap_move_chan_cfm_rsp rsp; | |
3658 | ||
3659 | BT_DBG("icid %d", icid); | |
3660 | ||
3661 | rsp.icid = cpu_to_le16(icid); | |
3662 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3663 | } | |
3664 | ||
3665 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3666 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3667 | { | |
3668 | struct l2cap_move_chan_req *req = data; | |
3669 | u16 icid = 0; | |
3670 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3671 | ||
3672 | if (cmd_len != sizeof(*req)) | |
3673 | return -EPROTO; | |
3674 | ||
3675 | icid = le16_to_cpu(req->icid); | |
3676 | ||
3677 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3678 | ||
3679 | if (!enable_hs) | |
3680 | return -EINVAL; | |
3681 | ||
3682 | /* Placeholder: Always refuse */ | |
3683 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3684 | ||
3685 | return 0; | |
3686 | } | |
3687 | ||
3688 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3689 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3690 | { | |
3691 | struct l2cap_move_chan_rsp *rsp = data; | |
3692 | u16 icid, result; | |
3693 | ||
3694 | if (cmd_len != sizeof(*rsp)) | |
3695 | return -EPROTO; | |
3696 | ||
3697 | icid = le16_to_cpu(rsp->icid); | |
3698 | result = le16_to_cpu(rsp->result); | |
3699 | ||
3700 | BT_DBG("icid %d, result %d", icid, result); | |
3701 | ||
3702 | /* Placeholder: Always unconfirmed */ | |
3703 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3704 | ||
3705 | return 0; | |
3706 | } | |
3707 | ||
3708 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3709 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3710 | { | |
3711 | struct l2cap_move_chan_cfm *cfm = data; | |
3712 | u16 icid, result; | |
3713 | ||
3714 | if (cmd_len != sizeof(*cfm)) | |
3715 | return -EPROTO; | |
3716 | ||
3717 | icid = le16_to_cpu(cfm->icid); | |
3718 | result = le16_to_cpu(cfm->result); | |
3719 | ||
3720 | BT_DBG("icid %d, result %d", icid, result); | |
3721 | ||
3722 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3723 | ||
3724 | return 0; | |
3725 | } | |
3726 | ||
3727 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3728 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3729 | { | |
3730 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3731 | u16 icid; | |
3732 | ||
3733 | if (cmd_len != sizeof(*rsp)) | |
3734 | return -EPROTO; | |
3735 | ||
3736 | icid = le16_to_cpu(rsp->icid); | |
3737 | ||
3738 | BT_DBG("icid %d", icid); | |
3739 | ||
3740 | return 0; | |
3741 | } | |
3742 | ||
e2174ca4 | 3743 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3744 | u16 to_multiplier) |
3745 | { | |
3746 | u16 max_latency; | |
3747 | ||
3748 | if (min > max || min < 6 || max > 3200) | |
3749 | return -EINVAL; | |
3750 | ||
3751 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3752 | return -EINVAL; | |
3753 | ||
3754 | if (max >= to_multiplier * 8) | |
3755 | return -EINVAL; | |
3756 | ||
3757 | max_latency = (to_multiplier * 8 / max) - 1; | |
3758 | if (latency > 499 || latency > max_latency) | |
3759 | return -EINVAL; | |
3760 | ||
3761 | return 0; | |
3762 | } | |
3763 | ||
3764 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3765 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3766 | { | |
3767 | struct hci_conn *hcon = conn->hcon; | |
3768 | struct l2cap_conn_param_update_req *req; | |
3769 | struct l2cap_conn_param_update_rsp rsp; | |
3770 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3771 | int err; |
de73115a CT |
3772 | |
3773 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3774 | return -EINVAL; | |
3775 | ||
3776 | cmd_len = __le16_to_cpu(cmd->len); | |
3777 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3778 | return -EPROTO; | |
3779 | ||
3780 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3781 | min = __le16_to_cpu(req->min); |
3782 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3783 | latency = __le16_to_cpu(req->latency); |
3784 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3785 | ||
3786 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3787 | min, max, latency, to_multiplier); | |
3788 | ||
3789 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3790 | |
3791 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3792 | if (err) | |
de73115a CT |
3793 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3794 | else | |
3795 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3796 | ||
3797 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3798 | sizeof(rsp), &rsp); | |
3799 | ||
2ce603eb CT |
3800 | if (!err) |
3801 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3802 | ||
de73115a CT |
3803 | return 0; |
3804 | } | |
3805 | ||
3300d9a9 CT |
3806 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3807 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3808 | { | |
3809 | int err = 0; | |
3810 | ||
3811 | switch (cmd->code) { | |
3812 | case L2CAP_COMMAND_REJ: | |
3813 | l2cap_command_rej(conn, cmd, data); | |
3814 | break; | |
3815 | ||
3816 | case L2CAP_CONN_REQ: | |
3817 | err = l2cap_connect_req(conn, cmd, data); | |
3818 | break; | |
3819 | ||
3820 | case L2CAP_CONN_RSP: | |
3821 | err = l2cap_connect_rsp(conn, cmd, data); | |
3822 | break; | |
3823 | ||
3824 | case L2CAP_CONF_REQ: | |
3825 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3826 | break; | |
3827 | ||
3828 | case L2CAP_CONF_RSP: | |
3829 | err = l2cap_config_rsp(conn, cmd, data); | |
3830 | break; | |
3831 | ||
3832 | case L2CAP_DISCONN_REQ: | |
3833 | err = l2cap_disconnect_req(conn, cmd, data); | |
3834 | break; | |
3835 | ||
3836 | case L2CAP_DISCONN_RSP: | |
3837 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3838 | break; | |
3839 | ||
3840 | case L2CAP_ECHO_REQ: | |
3841 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3842 | break; | |
3843 | ||
3844 | case L2CAP_ECHO_RSP: | |
3845 | break; | |
3846 | ||
3847 | case L2CAP_INFO_REQ: | |
3848 | err = l2cap_information_req(conn, cmd, data); | |
3849 | break; | |
3850 | ||
3851 | case L2CAP_INFO_RSP: | |
3852 | err = l2cap_information_rsp(conn, cmd, data); | |
3853 | break; | |
3854 | ||
f94ff6ff MM |
3855 | case L2CAP_CREATE_CHAN_REQ: |
3856 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3857 | break; | |
3858 | ||
3859 | case L2CAP_CREATE_CHAN_RSP: | |
3860 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3861 | break; | |
3862 | ||
8d5a04a1 MM |
3863 | case L2CAP_MOVE_CHAN_REQ: |
3864 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3865 | break; | |
3866 | ||
3867 | case L2CAP_MOVE_CHAN_RSP: | |
3868 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3869 | break; | |
3870 | ||
3871 | case L2CAP_MOVE_CHAN_CFM: | |
3872 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3873 | break; | |
3874 | ||
3875 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3876 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3877 | break; | |
3878 | ||
3300d9a9 CT |
3879 | default: |
3880 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3881 | err = -EINVAL; | |
3882 | break; | |
3883 | } | |
3884 | ||
3885 | return err; | |
3886 | } | |
3887 | ||
3888 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3889 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3890 | { | |
3891 | switch (cmd->code) { | |
3892 | case L2CAP_COMMAND_REJ: | |
3893 | return 0; | |
3894 | ||
3895 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3896 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3897 | |
3898 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3899 | return 0; | |
3900 | ||
3901 | default: | |
3902 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3903 | return -EINVAL; | |
3904 | } | |
3905 | } | |
3906 | ||
3907 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3908 | struct sk_buff *skb) | |
1da177e4 LT |
3909 | { |
3910 | u8 *data = skb->data; | |
3911 | int len = skb->len; | |
3912 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3913 | int err; |
1da177e4 LT |
3914 | |
3915 | l2cap_raw_recv(conn, skb); | |
3916 | ||
3917 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3918 | u16 cmd_len; |
1da177e4 LT |
3919 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3920 | data += L2CAP_CMD_HDR_SIZE; | |
3921 | len -= L2CAP_CMD_HDR_SIZE; | |
3922 | ||
88219a0f | 3923 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3924 | |
88219a0f | 3925 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3926 | |
88219a0f | 3927 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3928 | BT_DBG("corrupted command"); |
3929 | break; | |
3930 | } | |
3931 | ||
3300d9a9 CT |
3932 | if (conn->hcon->type == LE_LINK) |
3933 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3934 | else | |
3935 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3936 | |
3937 | if (err) { | |
e2fd318e | 3938 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3939 | |
3940 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3941 | |
3942 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3943 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3944 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3945 | } | |
3946 | ||
88219a0f AV |
3947 | data += cmd_len; |
3948 | len -= cmd_len; | |
1da177e4 LT |
3949 | } |
3950 | ||
3951 | kfree_skb(skb); | |
3952 | } | |
3953 | ||
47d1ec61 | 3954 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3955 | { |
3956 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3957 | int hdr_size; |
3958 | ||
3959 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3960 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3961 | else | |
3962 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3963 | |
47d1ec61 | 3964 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3965 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3966 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3967 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3968 | ||
3969 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3970 | return -EBADMSG; |
fcc203c3 GP |
3971 | } |
3972 | return 0; | |
3973 | } | |
3974 | ||
525cd185 | 3975 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3976 | { |
88843ab0 | 3977 | u32 control = 0; |
d5392c8f | 3978 | |
6a026610 | 3979 | chan->frames_sent = 0; |
d5392c8f | 3980 | |
0b209fae | 3981 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3982 | |
e2ab4353 | 3983 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3984 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3985 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3986 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3987 | } |
3988 | ||
e2ab4353 | 3989 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3990 | l2cap_retransmit_frames(chan); |
d5392c8f | 3991 | |
525cd185 | 3992 | l2cap_ertm_send(chan); |
d5392c8f | 3993 | |
e2ab4353 | 3994 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3995 | chan->frames_sent == 0) { |
ab784b73 | 3996 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3997 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3998 | } |
3999 | } | |
4000 | ||
fb45de7d | 4001 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
4002 | { |
4003 | struct sk_buff *next_skb; | |
bfbacc11 | 4004 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f | 4005 | |
3ce3514f MM |
4006 | bt_cb(skb)->control.txseq = tx_seq; |
4007 | bt_cb(skb)->control.sar = sar; | |
8f17154f | 4008 | |
f1c6775b | 4009 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 4010 | |
836be934 | 4011 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 4012 | |
039d9572 | 4013 | while (next_skb) { |
3ce3514f | 4014 | if (bt_cb(next_skb)->control.txseq == tx_seq) |
9b53350d JPRV |
4015 | return -EINVAL; |
4016 | ||
836be934 | 4017 | next_tx_seq_offset = __seq_offset(chan, |
3ce3514f | 4018 | bt_cb(next_skb)->control.txseq, chan->buffer_seq); |
bfbacc11 JPRV |
4019 | |
4020 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 4021 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 4022 | return 0; |
8f17154f GP |
4023 | } |
4024 | ||
f1c6775b | 4025 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
4026 | next_skb = NULL; |
4027 | else | |
4028 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
4029 | } | |
8f17154f | 4030 | |
f1c6775b | 4031 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
4032 | |
4033 | return 0; | |
8f17154f GP |
4034 | } |
4035 | ||
84084a31 MM |
4036 | static void append_skb_frag(struct sk_buff *skb, |
4037 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4038 | { |
84084a31 MM |
4039 | /* skb->len reflects data in skb as well as all fragments |
4040 | * skb->data_len reflects only data in fragments | |
4041 | */ | |
4042 | if (!skb_has_frag_list(skb)) | |
4043 | skb_shinfo(skb)->frag_list = new_frag; | |
4044 | ||
4045 | new_frag->next = NULL; | |
4046 | ||
4047 | (*last_frag)->next = new_frag; | |
4048 | *last_frag = new_frag; | |
4049 | ||
4050 | skb->len += new_frag->len; | |
4051 | skb->data_len += new_frag->len; | |
4052 | skb->truesize += new_frag->truesize; | |
4053 | } | |
4054 | ||
88843ab0 | 4055 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
4056 | { |
4057 | int err = -EINVAL; | |
18778a63 | 4058 | |
7e0ef6ee AE |
4059 | switch (__get_ctrl_sar(chan, control)) { |
4060 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
4061 | if (chan->sdu) |
4062 | break; | |
18778a63 | 4063 | |
84084a31 MM |
4064 | err = chan->ops->recv(chan->data, skb); |
4065 | break; | |
18778a63 | 4066 | |
7e0ef6ee | 4067 | case L2CAP_SAR_START: |
84084a31 MM |
4068 | if (chan->sdu) |
4069 | break; | |
18778a63 | 4070 | |
6f61fd47 | 4071 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4072 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4073 | |
84084a31 MM |
4074 | if (chan->sdu_len > chan->imtu) { |
4075 | err = -EMSGSIZE; | |
4076 | break; | |
4077 | } | |
1890d36b | 4078 | |
84084a31 MM |
4079 | if (skb->len >= chan->sdu_len) |
4080 | break; | |
18778a63 | 4081 | |
84084a31 MM |
4082 | chan->sdu = skb; |
4083 | chan->sdu_last_frag = skb; | |
18778a63 | 4084 | |
84084a31 MM |
4085 | skb = NULL; |
4086 | err = 0; | |
18778a63 GP |
4087 | break; |
4088 | ||
7e0ef6ee | 4089 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4090 | if (!chan->sdu) |
84084a31 | 4091 | break; |
18778a63 | 4092 | |
84084a31 MM |
4093 | append_skb_frag(chan->sdu, skb, |
4094 | &chan->sdu_last_frag); | |
4095 | skb = NULL; | |
18778a63 | 4096 | |
84084a31 MM |
4097 | if (chan->sdu->len >= chan->sdu_len) |
4098 | break; | |
4178ba46 | 4099 | |
84084a31 | 4100 | err = 0; |
18778a63 GP |
4101 | break; |
4102 | ||
7e0ef6ee | 4103 | case L2CAP_SAR_END: |
6f61fd47 | 4104 | if (!chan->sdu) |
84084a31 | 4105 | break; |
18778a63 | 4106 | |
84084a31 MM |
4107 | append_skb_frag(chan->sdu, skb, |
4108 | &chan->sdu_last_frag); | |
4109 | skb = NULL; | |
4178ba46 | 4110 | |
84084a31 MM |
4111 | if (chan->sdu->len != chan->sdu_len) |
4112 | break; | |
18778a63 | 4113 | |
84084a31 | 4114 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4115 | |
84084a31 MM |
4116 | if (!err) { |
4117 | /* Reassembly complete */ | |
4118 | chan->sdu = NULL; | |
4119 | chan->sdu_last_frag = NULL; | |
4120 | chan->sdu_len = 0; | |
1890d36b | 4121 | } |
18778a63 GP |
4122 | break; |
4123 | } | |
4124 | ||
84084a31 MM |
4125 | if (err) { |
4126 | kfree_skb(skb); | |
4127 | kfree_skb(chan->sdu); | |
4128 | chan->sdu = NULL; | |
4129 | chan->sdu_last_frag = NULL; | |
4130 | chan->sdu_len = 0; | |
4131 | } | |
18778a63 | 4132 | |
84084a31 | 4133 | return err; |
18778a63 GP |
4134 | } |
4135 | ||
26f880d2 | 4136 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 4137 | { |
26f880d2 | 4138 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 4139 | |
26f880d2 | 4140 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3c588192 | 4141 | l2cap_seq_list_clear(&chan->srej_list); |
26f880d2 | 4142 | |
77f918bc | 4143 | __set_ack_timer(chan); |
26f880d2 MM |
4144 | } |
4145 | ||
4146 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
4147 | { | |
88843ab0 | 4148 | u32 control; |
712132eb | 4149 | |
e2ab4353 | 4150 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
4151 | goto done; |
4152 | ||
0b209fae | 4153 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 4154 | control |= __set_ctrl_poll(chan); |
ab784b73 | 4155 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 4156 | l2cap_send_sframe(chan, control); |
6a026610 | 4157 | chan->retry_count = 1; |
712132eb | 4158 | |
1a09bcb9 GP |
4159 | __clear_retrans_timer(chan); |
4160 | __set_monitor_timer(chan); | |
712132eb | 4161 | |
e2ab4353 | 4162 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
4163 | |
4164 | done: | |
e2ab4353 GP |
4165 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
4166 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 4167 | |
49208c9c | 4168 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
4169 | } |
4170 | ||
e328140f | 4171 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 4172 | { |
e328140f MM |
4173 | if (chan->mode == L2CAP_MODE_ERTM) { |
4174 | if (busy) | |
4175 | l2cap_ertm_enter_local_busy(chan); | |
4176 | else | |
4177 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 4178 | } |
1890d36b GP |
4179 | } |
4180 | ||
fb45de7d | 4181 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
4182 | { |
4183 | struct sk_buff *skb; | |
88843ab0 | 4184 | u32 control; |
8f17154f | 4185 | |
e328140f MM |
4186 | while ((skb = skb_peek(&chan->srej_q)) && |
4187 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4188 | int err; | |
4189 | ||
3ce3514f | 4190 | if (bt_cb(skb)->control.txseq != tx_seq) |
8f17154f GP |
4191 | break; |
4192 | ||
f1c6775b | 4193 | skb = skb_dequeue(&chan->srej_q); |
3ce3514f | 4194 | control = __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
84084a31 | 4195 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
4196 | |
4197 | if (err < 0) { | |
4198 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4199 | break; | |
4200 | } | |
4201 | ||
836be934 AE |
4202 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
4203 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
4204 | } |
4205 | } | |
4206 | ||
fb45de7d | 4207 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4208 | { |
8f17154f | 4209 | struct srej_list *l, *tmp; |
88843ab0 | 4210 | u32 control; |
8f17154f | 4211 | |
39d5a3ee | 4212 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
4213 | if (l->tx_seq == tx_seq) { |
4214 | list_del(&l->list); | |
4215 | kfree(l); | |
4216 | return; | |
4217 | } | |
ab784b73 | 4218 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4219 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 4220 | l2cap_send_sframe(chan, control); |
8f17154f | 4221 | list_del(&l->list); |
39d5a3ee | 4222 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
4223 | } |
4224 | } | |
4225 | ||
aef89f21 | 4226 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4227 | { |
8f17154f | 4228 | struct srej_list *new; |
88843ab0 | 4229 | u32 control; |
8f17154f | 4230 | |
42e5c802 | 4231 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 4232 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4233 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
3c588192 | 4234 | l2cap_seq_list_append(&chan->srej_list, chan->expected_tx_seq); |
525cd185 | 4235 | l2cap_send_sframe(chan, control); |
8f17154f GP |
4236 | |
4237 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
4238 | if (!new) |
4239 | return -ENOMEM; | |
4240 | ||
42e5c802 | 4241 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
4242 | |
4243 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
4244 | ||
39d5a3ee | 4245 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 4246 | } |
836be934 AE |
4247 | |
4248 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
4249 | |
4250 | return 0; | |
8f17154f GP |
4251 | } |
4252 | ||
88843ab0 | 4253 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 4254 | { |
fb45de7d | 4255 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 4256 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 4257 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 4258 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 4259 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
4260 | int err = 0; |
4261 | ||
88843ab0 | 4262 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 4263 | tx_seq, rx_control); |
1c2acffb | 4264 | |
03f6715d | 4265 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4266 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4267 | __clear_monitor_timer(chan); |
6a026610 | 4268 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4269 | __set_retrans_timer(chan); |
e2ab4353 | 4270 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
4271 | } |
4272 | ||
42e5c802 GP |
4273 | chan->expected_ack_seq = req_seq; |
4274 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 4275 | |
836be934 | 4276 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
4277 | |
4278 | /* invalid tx_seq */ | |
47d1ec61 | 4279 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 4280 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
4281 | goto drop; |
4282 | } | |
4283 | ||
77f918bc SJ |
4284 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
4285 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) | |
4286 | l2cap_send_ack(chan); | |
1890d36b | 4287 | goto drop; |
77f918bc | 4288 | } |
1890d36b | 4289 | |
02f1b641 MM |
4290 | if (tx_seq == chan->expected_tx_seq) |
4291 | goto expected; | |
4292 | ||
e2ab4353 | 4293 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 4294 | struct srej_list *first; |
30afb5b2 | 4295 | |
39d5a3ee | 4296 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
4297 | struct srej_list, list); |
4298 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 4299 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 4300 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
4301 | |
4302 | list_del(&first->list); | |
4303 | kfree(first); | |
4304 | ||
39d5a3ee | 4305 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 4306 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 4307 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 4308 | l2cap_send_ack(chan); |
49208c9c | 4309 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
4310 | } |
4311 | } else { | |
4312 | struct srej_list *l; | |
9b53350d JPRV |
4313 | |
4314 | /* duplicated tx_seq */ | |
42e5c802 | 4315 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 4316 | goto drop; |
8f17154f | 4317 | |
39d5a3ee | 4318 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 4319 | if (l->tx_seq == tx_seq) { |
525cd185 | 4320 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
4321 | return 0; |
4322 | } | |
4323 | } | |
aef89f21 SJ |
4324 | |
4325 | err = l2cap_send_srejframe(chan, tx_seq); | |
4326 | if (err < 0) { | |
4327 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4328 | return err; | |
4329 | } | |
30afb5b2 GP |
4330 | } |
4331 | } else { | |
836be934 AE |
4332 | expected_tx_seq_offset = __seq_offset(chan, |
4333 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
4334 | |
4335 | /* duplicated tx_seq */ | |
4336 | if (tx_seq_offset < expected_tx_seq_offset) | |
4337 | goto drop; | |
4338 | ||
e2ab4353 | 4339 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 4340 | |
49208c9c | 4341 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 4342 | |
39d5a3ee | 4343 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 4344 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 4345 | |
f1c6775b | 4346 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 4347 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 4348 | |
0ef3ef0f SJ |
4349 | /* Set P-bit only if there are some I-frames to ack. */ |
4350 | if (__clear_ack_timer(chan)) | |
4351 | set_bit(CONN_SEND_PBIT, &chan->conn_state); | |
ef54fd93 | 4352 | |
aef89f21 SJ |
4353 | err = l2cap_send_srejframe(chan, tx_seq); |
4354 | if (err < 0) { | |
4355 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4356 | return err; | |
4357 | } | |
1c2acffb | 4358 | } |
30afb5b2 GP |
4359 | return 0; |
4360 | ||
8f17154f | 4361 | expected: |
836be934 | 4362 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 4363 | |
e2ab4353 | 4364 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3ce3514f MM |
4365 | bt_cb(skb)->control.txseq = tx_seq; |
4366 | bt_cb(skb)->control.sar = sar; | |
f1c6775b | 4367 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
4368 | return 0; |
4369 | } | |
4370 | ||
84084a31 | 4371 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
4372 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
4373 | ||
e328140f MM |
4374 | if (err < 0) { |
4375 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4376 | return err; | |
4377 | } | |
2ece3684 | 4378 | |
03f6715d | 4379 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4380 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4381 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
4382 | } |
4383 | ||
c1b4f43b | 4384 | |
6a026610 GP |
4385 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
4386 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 4387 | l2cap_send_ack(chan); |
4d611e4d GP |
4388 | else |
4389 | __set_ack_timer(chan); | |
9e917af1 | 4390 | |
8f17154f | 4391 | return 0; |
9b53350d JPRV |
4392 | |
4393 | drop: | |
4394 | kfree_skb(skb); | |
4395 | return 0; | |
1c2acffb GP |
4396 | } |
4397 | ||
88843ab0 | 4398 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 4399 | { |
88843ab0 | 4400 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 4401 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 4402 | |
0b209fae | 4403 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 4404 | l2cap_drop_acked_frames(chan); |
1c2acffb | 4405 | |
e3781735 | 4406 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
4407 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
4408 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
4409 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 4410 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4411 | __set_retrans_timer(chan); |
05fbd89d | 4412 | |
e2ab4353 | 4413 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4414 | l2cap_send_srejtail(chan); |
05fbd89d | 4415 | } else { |
525cd185 | 4416 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4417 | } |
1d8f5d16 | 4418 | |
03f6715d | 4419 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4420 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4421 | |
e2ab4353 | 4422 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4423 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4424 | |
e072745f | 4425 | } else { |
e2ab4353 | 4426 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4427 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4428 | __set_retrans_timer(chan); |
1c2acffb | 4429 | |
e2ab4353 GP |
4430 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4431 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4432 | l2cap_send_ack(chan); |
894718a6 | 4433 | else |
525cd185 | 4434 | l2cap_ertm_send(chan); |
e072745f GP |
4435 | } |
4436 | } | |
2246b2f1 | 4437 | |
88843ab0 | 4438 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4439 | { |
0b209fae | 4440 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4441 | |
88843ab0 | 4442 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4443 | |
e2ab4353 | 4444 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4445 | |
42e5c802 GP |
4446 | chan->expected_ack_seq = tx_seq; |
4447 | l2cap_drop_acked_frames(chan); | |
e072745f | 4448 | |
03f6715d | 4449 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4450 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4451 | l2cap_retransmit_frames(chan); |
e072745f | 4452 | } else { |
525cd185 | 4453 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4454 | |
e2ab4353 GP |
4455 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4456 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4457 | } |
4458 | } | |
88843ab0 | 4459 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4460 | { |
0b209fae | 4461 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4462 | |
88843ab0 | 4463 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4464 | |
e2ab4353 | 4465 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4466 | |
e3781735 | 4467 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4468 | chan->expected_ack_seq = tx_seq; |
4469 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4470 | |
e2ab4353 | 4471 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4472 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4473 | |
525cd185 | 4474 | l2cap_ertm_send(chan); |
dfc909be | 4475 | |
e2ab4353 | 4476 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4477 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4478 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4479 | } |
03f6715d | 4480 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4481 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4482 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4483 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4484 | else |
525cd185 | 4485 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4486 | } else { |
525cd185 | 4487 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4488 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4489 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4490 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4491 | } |
e072745f GP |
4492 | } |
4493 | } | |
4494 | ||
88843ab0 | 4495 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4496 | { |
0b209fae | 4497 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4498 | |
88843ab0 | 4499 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4500 | |
e2ab4353 | 4501 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4502 | chan->expected_ack_seq = tx_seq; |
4503 | l2cap_drop_acked_frames(chan); | |
e072745f | 4504 | |
e3781735 | 4505 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4506 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4507 | |
e2ab4353 | 4508 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4509 | __clear_retrans_timer(chan); |
e3781735 | 4510 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4511 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4512 | return; |
e072745f | 4513 | } |
99b0d4b7 | 4514 | |
e3781735 | 4515 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4516 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4517 | } else { |
4518 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4519 | l2cap_send_sframe(chan, rx_control); | |
4520 | } | |
e072745f GP |
4521 | } |
4522 | ||
88843ab0 | 4523 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4524 | { |
88843ab0 | 4525 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4526 | |
03f6715d | 4527 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4528 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4529 | __clear_monitor_timer(chan); |
6a026610 | 4530 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4531 | __set_retrans_timer(chan); |
e2ab4353 | 4532 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4533 | } |
4534 | ||
ab784b73 AE |
4535 | switch (__get_ctrl_super(chan, rx_control)) { |
4536 | case L2CAP_SUPER_RR: | |
525cd185 | 4537 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4538 | break; |
4539 | ||
ab784b73 | 4540 | case L2CAP_SUPER_REJ: |
525cd185 | 4541 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4542 | break; |
2246b2f1 | 4543 | |
ab784b73 | 4544 | case L2CAP_SUPER_SREJ: |
525cd185 | 4545 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4546 | break; |
4547 | ||
ab784b73 | 4548 | case L2CAP_SUPER_RNR: |
525cd185 | 4549 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4550 | break; |
4551 | } | |
4552 | ||
faaebd19 | 4553 | kfree_skb(skb); |
1c2acffb GP |
4554 | return 0; |
4555 | } | |
4556 | ||
cad8f1d0 | 4557 | static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
218bb9df | 4558 | { |
88843ab0 | 4559 | u32 control; |
0b209fae | 4560 | u16 req_seq; |
218bb9df GP |
4561 | int len, next_tx_seq_offset, req_seq_offset; |
4562 | ||
b76bbd66 MM |
4563 | __unpack_control(chan, skb); |
4564 | ||
88843ab0 AE |
4565 | control = __get_control(chan, skb->data); |
4566 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4567 | len = skb->len; |
4568 | ||
4569 | /* | |
4570 | * We can just drop the corrupted I-frame here. | |
4571 | * Receiver will miss it and start proper recovery | |
4572 | * procedures and ask retransmission. | |
4573 | */ | |
47d1ec61 | 4574 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4575 | goto drop; |
4576 | ||
793c2f1c | 4577 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4578 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4579 | |
47d1ec61 | 4580 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4581 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4582 | |
47d1ec61 | 4583 | if (len > chan->mps) { |
8c1d787b | 4584 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4585 | goto drop; |
4586 | } | |
4587 | ||
0b209fae | 4588 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4589 | |
836be934 AE |
4590 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4591 | ||
4592 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4593 | chan->expected_ack_seq); | |
218bb9df GP |
4594 | |
4595 | /* check for invalid req-seq */ | |
4596 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4597 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4598 | goto drop; |
4599 | } | |
4600 | ||
793c2f1c | 4601 | if (!__is_sframe(chan, control)) { |
218bb9df | 4602 | if (len < 0) { |
8c1d787b | 4603 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4604 | goto drop; |
4605 | } | |
4606 | ||
525cd185 | 4607 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4608 | } else { |
4609 | if (len != 0) { | |
4610 | BT_ERR("%d", len); | |
8c1d787b | 4611 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4612 | goto drop; |
4613 | } | |
4614 | ||
525cd185 | 4615 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4616 | } |
4617 | ||
4618 | return 0; | |
4619 | ||
4620 | drop: | |
4621 | kfree_skb(skb); | |
4622 | return 0; | |
4623 | } | |
4624 | ||
1da177e4 LT |
4625 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4626 | { | |
48454079 | 4627 | struct l2cap_chan *chan; |
88843ab0 | 4628 | u32 control; |
fb45de7d | 4629 | u16 tx_seq; |
218bb9df | 4630 | int len; |
1da177e4 | 4631 | |
baa7e1fa | 4632 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4633 | if (!chan) { |
1da177e4 | 4634 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 4635 | /* Drop packet and return */ |
3379013b | 4636 | kfree_skb(skb); |
6be36555 | 4637 | return 0; |
1da177e4 LT |
4638 | } |
4639 | ||
49208c9c | 4640 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4641 | |
89bc500e | 4642 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4643 | goto drop; |
4644 | ||
0c1bc5c6 | 4645 | switch (chan->mode) { |
1c2acffb GP |
4646 | case L2CAP_MODE_BASIC: |
4647 | /* If socket recv buffers overflows we drop data here | |
4648 | * which is *bad* because L2CAP has to be reliable. | |
4649 | * But we don't have any other choice. L2CAP doesn't | |
4650 | * provide flow control mechanism. */ | |
1da177e4 | 4651 | |
0c1bc5c6 | 4652 | if (chan->imtu < skb->len) |
1c2acffb | 4653 | goto drop; |
1da177e4 | 4654 | |
23070494 | 4655 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4656 | goto done; |
4657 | break; | |
4658 | ||
4659 | case L2CAP_MODE_ERTM: | |
5ef8cb9e | 4660 | l2cap_ertm_data_rcv(chan, skb); |
1c2acffb | 4661 | |
fcafde2e | 4662 | goto done; |
1c2acffb | 4663 | |
6840ed07 | 4664 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4665 | control = __get_control(chan, skb->data); |
4666 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4667 | len = skb->len; |
4668 | ||
47d1ec61 | 4669 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4670 | goto drop; |
4671 | ||
7e0ef6ee | 4672 | if (__is_sar_start(chan, control)) |
03a51213 | 4673 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4674 | |
47d1ec61 | 4675 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4676 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4677 | |
793c2f1c | 4678 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4679 | goto drop; |
4680 | ||
fb45de7d | 4681 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4682 | |
84084a31 MM |
4683 | if (chan->expected_tx_seq != tx_seq) { |
4684 | /* Frame(s) missing - must discard partial SDU */ | |
4685 | kfree_skb(chan->sdu); | |
4686 | chan->sdu = NULL; | |
4687 | chan->sdu_last_frag = NULL; | |
4688 | chan->sdu_len = 0; | |
6840ed07 | 4689 | |
84084a31 MM |
4690 | /* TODO: Notify userland of missing data */ |
4691 | } | |
4692 | ||
836be934 | 4693 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4694 | |
4695 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4696 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4697 | |
4698 | goto done; | |
4699 | ||
1c2acffb | 4700 | default: |
0c1bc5c6 | 4701 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4702 | break; |
4703 | } | |
1da177e4 LT |
4704 | |
4705 | drop: | |
4706 | kfree_skb(skb); | |
4707 | ||
4708 | done: | |
6be36555 | 4709 | l2cap_chan_unlock(chan); |
0139418c | 4710 | |
1da177e4 LT |
4711 | return 0; |
4712 | } | |
4713 | ||
8e036fc3 | 4714 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4715 | { |
23691d75 | 4716 | struct l2cap_chan *chan; |
1da177e4 | 4717 | |
c2287681 | 4718 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 4719 | if (!chan) |
1da177e4 LT |
4720 | goto drop; |
4721 | ||
5b4cedaa | 4722 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4723 | |
89bc500e | 4724 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4725 | goto drop; |
4726 | ||
e13e21dc | 4727 | if (chan->imtu < skb->len) |
1da177e4 LT |
4728 | goto drop; |
4729 | ||
23070494 | 4730 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4731 | return 0; |
1da177e4 LT |
4732 | |
4733 | drop: | |
4734 | kfree_skb(skb); | |
4735 | ||
1da177e4 LT |
4736 | return 0; |
4737 | } | |
4738 | ||
d9b88702 AE |
4739 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
4740 | struct sk_buff *skb) | |
9f69bda6 | 4741 | { |
23691d75 | 4742 | struct l2cap_chan *chan; |
9f69bda6 | 4743 | |
c2287681 | 4744 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 4745 | if (!chan) |
9f69bda6 GP |
4746 | goto drop; |
4747 | ||
5b4cedaa | 4748 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 4749 | |
89bc500e | 4750 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4751 | goto drop; |
4752 | ||
e13e21dc | 4753 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4754 | goto drop; |
4755 | ||
23070494 | 4756 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4757 | return 0; |
9f69bda6 GP |
4758 | |
4759 | drop: | |
4760 | kfree_skb(skb); | |
4761 | ||
9f69bda6 GP |
4762 | return 0; |
4763 | } | |
4764 | ||
1da177e4 LT |
4765 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4766 | { | |
4767 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4768 | u16 cid, len; |
4769 | __le16 psm; | |
1da177e4 LT |
4770 | |
4771 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4772 | cid = __le16_to_cpu(lh->cid); | |
4773 | len = __le16_to_cpu(lh->len); | |
4774 | ||
1c2acffb GP |
4775 | if (len != skb->len) { |
4776 | kfree_skb(skb); | |
4777 | return; | |
4778 | } | |
4779 | ||
1da177e4 LT |
4780 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4781 | ||
4782 | switch (cid) { | |
3300d9a9 | 4783 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4784 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4785 | l2cap_sig_channel(conn, skb); |
4786 | break; | |
4787 | ||
8db4dc46 | 4788 | case L2CAP_CID_CONN_LESS: |
097db76c | 4789 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
4790 | skb_pull(skb, 2); |
4791 | l2cap_conless_channel(conn, psm, skb); | |
4792 | break; | |
4793 | ||
9f69bda6 GP |
4794 | case L2CAP_CID_LE_DATA: |
4795 | l2cap_att_channel(conn, cid, skb); | |
4796 | break; | |
4797 | ||
b501d6a1 AB |
4798 | case L2CAP_CID_SMP: |
4799 | if (smp_sig_channel(conn, skb)) | |
4800 | l2cap_conn_del(conn->hcon, EACCES); | |
4801 | break; | |
4802 | ||
1da177e4 LT |
4803 | default: |
4804 | l2cap_data_channel(conn, cid, skb); | |
4805 | break; | |
4806 | } | |
4807 | } | |
4808 | ||
4809 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4810 | ||
686ebf28 | 4811 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
4812 | { |
4813 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4814 | struct l2cap_chan *c; |
1da177e4 | 4815 | |
1da177e4 LT |
4816 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
4817 | ||
4818 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4819 | read_lock(&chan_list_lock); |
4820 | list_for_each_entry(c, &chan_list, global_l) { | |
4821 | struct sock *sk = c->sk; | |
4343478f | 4822 | |
89bc500e | 4823 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4824 | continue; |
4825 | ||
4826 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4827 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4828 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4829 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4830 | exact++; |
2af6b9d5 MH |
4831 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4832 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4833 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4834 | lm2 |= HCI_LM_MASTER; |
4835 | } | |
1da177e4 | 4836 | } |
23691d75 | 4837 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4838 | |
4839 | return exact ? lm1 : lm2; | |
4840 | } | |
4841 | ||
686ebf28 | 4842 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 4843 | { |
0139418c MH |
4844 | struct l2cap_conn *conn; |
4845 | ||
1da177e4 LT |
4846 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4847 | ||
1da177e4 | 4848 | if (!status) { |
1da177e4 LT |
4849 | conn = l2cap_conn_add(hcon, status); |
4850 | if (conn) | |
4851 | l2cap_conn_ready(conn); | |
0139418c | 4852 | } else |
e175072f | 4853 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4854 | |
4855 | return 0; | |
4856 | } | |
4857 | ||
686ebf28 | 4858 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
4859 | { |
4860 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4861 | ||
4862 | BT_DBG("hcon %p", hcon); | |
4863 | ||
686ebf28 | 4864 | if (!conn) |
9f5a0d7b | 4865 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4866 | return conn->disc_reason; |
4867 | } | |
4868 | ||
686ebf28 | 4869 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
4870 | { |
4871 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4872 | ||
e175072f | 4873 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
4874 | return 0; |
4875 | } | |
4876 | ||
4343478f | 4877 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4878 | { |
715ec005 | 4879 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4880 | return; |
4881 | ||
f62e4323 | 4882 | if (encrypt == 0x00) { |
4343478f | 4883 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 4884 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4885 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4886 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4887 | } else { |
4343478f | 4888 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4889 | __clear_chan_timer(chan); |
f62e4323 MH |
4890 | } |
4891 | } | |
4892 | ||
686ebf28 | 4893 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4894 | { |
0139418c | 4895 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4896 | struct l2cap_chan *chan; |
1da177e4 | 4897 | |
0139418c | 4898 | if (!conn) |
1da177e4 | 4899 | return 0; |
0139418c | 4900 | |
1da177e4 LT |
4901 | BT_DBG("conn %p", conn); |
4902 | ||
160dc6ac | 4903 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
4904 | if (!status && encrypt) |
4905 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 4906 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
4907 | } |
4908 | ||
3df91ea2 | 4909 | mutex_lock(&conn->chan_lock); |
1da177e4 | 4910 | |
3df91ea2 | 4911 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 4912 | l2cap_chan_lock(chan); |
1da177e4 | 4913 | |
f1cb9af5 VCG |
4914 | BT_DBG("chan->scid %d", chan->scid); |
4915 | ||
4916 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4917 | if (!status && encrypt) { | |
4918 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 4919 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
4920 | } |
4921 | ||
6be36555 | 4922 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
4923 | continue; |
4924 | } | |
4925 | ||
c1360a1c | 4926 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 4927 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
4928 | continue; |
4929 | } | |
4930 | ||
89bc500e GP |
4931 | if (!status && (chan->state == BT_CONNECTED || |
4932 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
4933 | struct sock *sk = chan->sk; |
4934 | ||
c5daa683 | 4935 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
4936 | sk->sk_state_change(sk); |
4937 | ||
4343478f | 4938 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 4939 | l2cap_chan_unlock(chan); |
9719f8af MH |
4940 | continue; |
4941 | } | |
4942 | ||
89bc500e | 4943 | if (chan->state == BT_CONNECT) { |
b1235d79 | 4944 | if (!status) { |
9b27f350 | 4945 | l2cap_send_conn_req(chan); |
b1235d79 | 4946 | } else { |
ba13ccd9 | 4947 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4948 | } |
89bc500e | 4949 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 4950 | struct sock *sk = chan->sk; |
b1235d79 | 4951 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4952 | __u16 res, stat; |
1da177e4 | 4953 | |
6be36555 AE |
4954 | lock_sock(sk); |
4955 | ||
b1235d79 | 4956 | if (!status) { |
c5daa683 GP |
4957 | if (test_bit(BT_SK_DEFER_SETUP, |
4958 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
4959 | struct sock *parent = bt_sk(sk)->parent; |
4960 | res = L2CAP_CR_PEND; | |
4961 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4962 | if (parent) |
4963 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4964 | } else { |
0e587be7 | 4965 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4966 | res = L2CAP_CR_SUCCESS; |
4967 | stat = L2CAP_CS_NO_INFO; | |
4968 | } | |
b1235d79 | 4969 | } else { |
0e587be7 | 4970 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 4971 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4972 | res = L2CAP_CR_SEC_BLOCK; |
4973 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4974 | } |
4975 | ||
6be36555 AE |
4976 | release_sock(sk); |
4977 | ||
fe4128e0 GP |
4978 | rsp.scid = cpu_to_le16(chan->dcid); |
4979 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4980 | rsp.result = cpu_to_le16(res); |
4981 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4982 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4983 | sizeof(rsp), &rsp); | |
b1235d79 | 4984 | } |
1da177e4 | 4985 | |
6be36555 | 4986 | l2cap_chan_unlock(chan); |
1da177e4 LT |
4987 | } |
4988 | ||
3df91ea2 | 4989 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 4990 | |
1da177e4 LT |
4991 | return 0; |
4992 | } | |
4993 | ||
686ebf28 | 4994 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
4995 | { |
4996 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4997 | ||
5a08ecce AE |
4998 | if (!conn) |
4999 | conn = l2cap_conn_add(hcon, 0); | |
5000 | ||
5001 | if (!conn) | |
1da177e4 LT |
5002 | goto drop; |
5003 | ||
5004 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5005 | ||
e702112f | 5006 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5007 | struct l2cap_hdr *hdr; |
5008 | int len; | |
5009 | ||
5010 | if (conn->rx_len) { | |
5011 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5012 | kfree_skb(conn->rx_skb); | |
5013 | conn->rx_skb = NULL; | |
5014 | conn->rx_len = 0; | |
5015 | l2cap_conn_unreliable(conn, ECOMM); | |
5016 | } | |
5017 | ||
aae7fe22 AE |
5018 | /* Start fragment always begin with Basic L2CAP header */ |
5019 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5020 | BT_ERR("Frame is too short (len %d)", skb->len); |
5021 | l2cap_conn_unreliable(conn, ECOMM); | |
5022 | goto drop; | |
5023 | } | |
5024 | ||
5025 | hdr = (struct l2cap_hdr *) skb->data; | |
5026 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5027 | ||
5028 | if (len == skb->len) { | |
5029 | /* Complete frame received */ | |
5030 | l2cap_recv_frame(conn, skb); | |
5031 | return 0; | |
5032 | } | |
5033 | ||
5034 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5035 | ||
5036 | if (skb->len > len) { | |
5037 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5038 | skb->len, len); | |
5039 | l2cap_conn_unreliable(conn, ECOMM); | |
5040 | goto drop; | |
5041 | } | |
5042 | ||
5043 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5044 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5045 | if (!conn->rx_skb) | |
1da177e4 LT |
5046 | goto drop; |
5047 | ||
d626f62b | 5048 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5049 | skb->len); |
1da177e4 LT |
5050 | conn->rx_len = len - skb->len; |
5051 | } else { | |
5052 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5053 | ||
5054 | if (!conn->rx_len) { | |
5055 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5056 | l2cap_conn_unreliable(conn, ECOMM); | |
5057 | goto drop; | |
5058 | } | |
5059 | ||
5060 | if (skb->len > conn->rx_len) { | |
5061 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5062 | skb->len, conn->rx_len); | |
5063 | kfree_skb(conn->rx_skb); | |
5064 | conn->rx_skb = NULL; | |
5065 | conn->rx_len = 0; | |
5066 | l2cap_conn_unreliable(conn, ECOMM); | |
5067 | goto drop; | |
5068 | } | |
5069 | ||
d626f62b | 5070 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5071 | skb->len); |
1da177e4 LT |
5072 | conn->rx_len -= skb->len; |
5073 | ||
5074 | if (!conn->rx_len) { | |
5075 | /* Complete frame received */ | |
5076 | l2cap_recv_frame(conn, conn->rx_skb); | |
5077 | conn->rx_skb = NULL; | |
5078 | } | |
5079 | } | |
5080 | ||
5081 | drop: | |
5082 | kfree_skb(skb); | |
5083 | return 0; | |
5084 | } | |
5085 | ||
aef7d97c | 5086 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5087 | { |
23691d75 | 5088 | struct l2cap_chan *c; |
1da177e4 | 5089 | |
333055f2 | 5090 | read_lock(&chan_list_lock); |
1da177e4 | 5091 | |
23691d75 GP |
5092 | list_for_each_entry(c, &chan_list, global_l) { |
5093 | struct sock *sk = c->sk; | |
101545f6 | 5094 | |
903d343e | 5095 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5096 | batostr(&bt_sk(sk)->src), |
5097 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5098 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5099 | c->scid, c->dcid, c->imtu, c->omtu, |
5100 | c->sec_level, c->mode); | |
61e1b4b7 | 5101 | } |
1da177e4 | 5102 | |
333055f2 | 5103 | read_unlock(&chan_list_lock); |
1da177e4 | 5104 | |
aef7d97c | 5105 | return 0; |
1da177e4 LT |
5106 | } |
5107 | ||
aef7d97c MH |
5108 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5109 | { | |
5110 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5111 | } | |
5112 | ||
5113 | static const struct file_operations l2cap_debugfs_fops = { | |
5114 | .open = l2cap_debugfs_open, | |
5115 | .read = seq_read, | |
5116 | .llseek = seq_lseek, | |
5117 | .release = single_release, | |
5118 | }; | |
5119 | ||
5120 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5121 | |
64274518 | 5122 | int __init l2cap_init(void) |
1da177e4 LT |
5123 | { |
5124 | int err; | |
be9d1227 | 5125 | |
bb58f747 | 5126 | err = l2cap_init_sockets(); |
1da177e4 LT |
5127 | if (err < 0) |
5128 | return err; | |
5129 | ||
aef7d97c MH |
5130 | if (bt_debugfs) { |
5131 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5132 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5133 | if (!l2cap_debugfs) | |
5134 | BT_ERR("Failed to create L2CAP debug file"); | |
5135 | } | |
1da177e4 | 5136 | |
1da177e4 | 5137 | return 0; |
1da177e4 LT |
5138 | } |
5139 | ||
64274518 | 5140 | void l2cap_exit(void) |
1da177e4 | 5141 | { |
aef7d97c | 5142 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5143 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5144 | } |
5145 | ||
d1c4a17d GP |
5146 | module_param(disable_ertm, bool, 0644); |
5147 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |