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 | |
b191e031 | 60 | bool disable_ertm = 1; |
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 | |
608bcc6d MM |
76 | static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
77 | struct sk_buff_head *skbs, u8 event); | |
78 | ||
0139418c | 79 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 80 | |
baa7e1fa | 81 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 82 | { |
3df91ea2 | 83 | struct l2cap_chan *c; |
3d57dc68 | 84 | |
3df91ea2 AE |
85 | list_for_each_entry(c, &conn->chan_l, list) { |
86 | if (c->dcid == cid) | |
87 | return c; | |
0139418c | 88 | } |
3df91ea2 | 89 | return NULL; |
0139418c MH |
90 | } |
91 | ||
baa7e1fa | 92 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 93 | { |
3df91ea2 | 94 | struct l2cap_chan *c; |
3d57dc68 | 95 | |
3df91ea2 AE |
96 | list_for_each_entry(c, &conn->chan_l, list) { |
97 | if (c->scid == cid) | |
98 | return c; | |
0139418c | 99 | } |
3df91ea2 | 100 | return NULL; |
0139418c MH |
101 | } |
102 | ||
103 | /* Find channel with given SCID. | |
ef191ade | 104 | * Returns locked channel. */ |
baa7e1fa | 105 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 106 | { |
48454079 | 107 | struct l2cap_chan *c; |
baa7e1fa | 108 | |
3df91ea2 | 109 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 110 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
111 | if (c) |
112 | l2cap_chan_lock(c); | |
3df91ea2 AE |
113 | mutex_unlock(&conn->chan_lock); |
114 | ||
48454079 | 115 | return c; |
0139418c MH |
116 | } |
117 | ||
baa7e1fa | 118 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 119 | { |
3df91ea2 | 120 | struct l2cap_chan *c; |
3d57dc68 | 121 | |
3df91ea2 AE |
122 | list_for_each_entry(c, &conn->chan_l, list) { |
123 | if (c->ident == ident) | |
124 | return c; | |
0139418c | 125 | } |
3df91ea2 | 126 | return NULL; |
0139418c MH |
127 | } |
128 | ||
23691d75 | 129 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 130 | { |
23691d75 | 131 | struct l2cap_chan *c; |
9e4425ff | 132 | |
23691d75 GP |
133 | list_for_each_entry(c, &chan_list, global_l) { |
134 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 135 | return c; |
9e4425ff | 136 | } |
250938cb | 137 | return NULL; |
9e4425ff GP |
138 | } |
139 | ||
140 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
141 | { | |
73b2ec18 GP |
142 | int err; |
143 | ||
333055f2 | 144 | write_lock(&chan_list_lock); |
9e4425ff | 145 | |
23691d75 | 146 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
147 | err = -EADDRINUSE; |
148 | goto done; | |
9e4425ff GP |
149 | } |
150 | ||
73b2ec18 GP |
151 | if (psm) { |
152 | chan->psm = psm; | |
153 | chan->sport = psm; | |
154 | err = 0; | |
155 | } else { | |
156 | u16 p; | |
157 | ||
158 | err = -EINVAL; | |
159 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 160 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
161 | chan->psm = cpu_to_le16(p); |
162 | chan->sport = cpu_to_le16(p); | |
163 | err = 0; | |
164 | break; | |
165 | } | |
166 | } | |
9e4425ff | 167 | |
73b2ec18 | 168 | done: |
333055f2 | 169 | write_unlock(&chan_list_lock); |
73b2ec18 | 170 | return err; |
9e4425ff GP |
171 | } |
172 | ||
173 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
174 | { | |
333055f2 | 175 | write_lock(&chan_list_lock); |
9e4425ff GP |
176 | |
177 | chan->scid = scid; | |
178 | ||
333055f2 | 179 | write_unlock(&chan_list_lock); |
9e4425ff GP |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
baa7e1fa | 184 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 185 | { |
8db4dc46 | 186 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 187 | |
8db4dc46 | 188 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 189 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
190 | return cid; |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
0e587be7 | 196 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 197 | { |
42d2d87c | 198 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
199 | state_to_string(state)); |
200 | ||
89bc500e GP |
201 | chan->state = state; |
202 | chan->ops->state_change(chan->data, state); | |
203 | } | |
204 | ||
0e587be7 AE |
205 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
206 | { | |
207 | struct sock *sk = chan->sk; | |
208 | ||
209 | lock_sock(sk); | |
210 | __l2cap_state_change(chan, state); | |
211 | release_sock(sk); | |
212 | } | |
213 | ||
2e0052e4 AE |
214 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
215 | { | |
216 | struct sock *sk = chan->sk; | |
217 | ||
218 | sk->sk_err = err; | |
219 | } | |
220 | ||
221 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
222 | { | |
223 | struct sock *sk = chan->sk; | |
224 | ||
225 | lock_sock(sk); | |
226 | __l2cap_chan_set_err(chan, err); | |
227 | release_sock(sk); | |
228 | } | |
229 | ||
608bcc6d MM |
230 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
231 | u16 seq) | |
232 | { | |
233 | struct sk_buff *skb; | |
234 | ||
235 | skb_queue_walk(head, skb) { | |
236 | if (bt_cb(skb)->control.txseq == seq) | |
237 | return skb; | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
3c588192 MM |
243 | /* ---- L2CAP sequence number lists ---- */ |
244 | ||
245 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
246 | * SREJ requests that are received and for frames that are to be | |
247 | * retransmitted. These seq_list functions implement a singly-linked | |
248 | * list in an array, where membership in the list can also be checked | |
249 | * in constant time. Items can also be added to the tail of the list | |
250 | * and removed from the head in constant time, without further memory | |
251 | * allocs or frees. | |
252 | */ | |
253 | ||
254 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
255 | { | |
256 | size_t alloc_size, i; | |
257 | ||
258 | /* Allocated size is a power of 2 to map sequence numbers | |
259 | * (which may be up to 14 bits) in to a smaller array that is | |
260 | * sized for the negotiated ERTM transmit windows. | |
261 | */ | |
262 | alloc_size = roundup_pow_of_two(size); | |
263 | ||
264 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
265 | if (!seq_list->list) | |
266 | return -ENOMEM; | |
267 | ||
268 | seq_list->mask = alloc_size - 1; | |
269 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
270 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
271 | for (i = 0; i < alloc_size; i++) | |
272 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
278 | { | |
279 | kfree(seq_list->list); | |
280 | } | |
281 | ||
282 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
283 | u16 seq) | |
284 | { | |
285 | /* Constant-time check for list membership */ | |
286 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
287 | } | |
288 | ||
289 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
290 | { | |
291 | u16 mask = seq_list->mask; | |
292 | ||
293 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
294 | /* In case someone tries to pop the head of an empty list */ | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } else if (seq_list->head == seq) { | |
297 | /* Head can be removed in constant time */ | |
298 | seq_list->head = seq_list->list[seq & mask]; | |
299 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
300 | ||
301 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
302 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
303 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
304 | } | |
305 | } else { | |
306 | /* Walk the list to find the sequence number */ | |
307 | u16 prev = seq_list->head; | |
308 | while (seq_list->list[prev & mask] != seq) { | |
309 | prev = seq_list->list[prev & mask]; | |
310 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
311 | return L2CAP_SEQ_LIST_CLEAR; | |
312 | } | |
313 | ||
314 | /* Unlink the number from the list and clear it */ | |
315 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
316 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
317 | if (seq_list->tail == seq) | |
318 | seq_list->tail = prev; | |
319 | } | |
320 | return seq; | |
321 | } | |
322 | ||
323 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | /* Remove the head in constant time */ | |
326 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
327 | } | |
328 | ||
329 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
330 | { | |
f522ae36 | 331 | u16 i; |
3c588192 | 332 | |
f522ae36 GP |
333 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
335 | ||
336 | for (i = 0; i <= seq_list->mask; i++) | |
337 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
338 | ||
339 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
340 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
341 | } |
342 | ||
343 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
344 | { | |
345 | u16 mask = seq_list->mask; | |
346 | ||
347 | /* All appends happen in constant time */ | |
348 | ||
f522ae36 GP |
349 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
350 | return; | |
3c588192 | 351 | |
f522ae36 GP |
352 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
353 | seq_list->head = seq; | |
354 | else | |
355 | seq_list->list[seq_list->tail & mask] = seq; | |
356 | ||
357 | seq_list->tail = seq; | |
358 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
359 | } |
360 | ||
721c4181 | 361 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 362 | { |
721c4181 GP |
363 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
364 | chan_timer.work); | |
3df91ea2 | 365 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
366 | int reason; |
367 | ||
e05dcc32 | 368 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 369 | |
3df91ea2 | 370 | mutex_lock(&conn->chan_lock); |
6be36555 | 371 | l2cap_chan_lock(chan); |
ab07801d | 372 | |
89bc500e | 373 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 374 | reason = ECONNREFUSED; |
89bc500e | 375 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
376 | chan->sec_level != BT_SECURITY_SDP) |
377 | reason = ECONNREFUSED; | |
378 | else | |
379 | reason = ETIMEDOUT; | |
380 | ||
0f852724 | 381 | l2cap_chan_close(chan, reason); |
ab07801d | 382 | |
6be36555 | 383 | l2cap_chan_unlock(chan); |
ab07801d | 384 | |
ba3bd0ee | 385 | chan->ops->close(chan->data); |
3df91ea2 AE |
386 | mutex_unlock(&conn->chan_lock); |
387 | ||
371fd835 | 388 | l2cap_chan_put(chan); |
ab07801d GP |
389 | } |
390 | ||
eef1d9b6 | 391 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
392 | { |
393 | struct l2cap_chan *chan; | |
394 | ||
395 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
396 | if (!chan) | |
397 | return NULL; | |
398 | ||
c03b355e AE |
399 | mutex_init(&chan->lock); |
400 | ||
333055f2 | 401 | write_lock(&chan_list_lock); |
23691d75 | 402 | list_add(&chan->global_l, &chan_list); |
333055f2 | 403 | write_unlock(&chan_list_lock); |
23691d75 | 404 | |
721c4181 | 405 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 406 | |
89bc500e GP |
407 | chan->state = BT_OPEN; |
408 | ||
71ba0e56 GP |
409 | atomic_set(&chan->refcnt, 1); |
410 | ||
2827011f MM |
411 | /* This flag is cleared in l2cap_chan_ready() */ |
412 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
413 | ||
eef1d9b6 | 414 | BT_DBG("chan %p", chan); |
abc545b8 | 415 | |
48454079 GP |
416 | return chan; |
417 | } | |
418 | ||
23691d75 | 419 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 420 | { |
333055f2 | 421 | write_lock(&chan_list_lock); |
23691d75 | 422 | list_del(&chan->global_l); |
333055f2 | 423 | write_unlock(&chan_list_lock); |
23691d75 | 424 | |
371fd835 | 425 | l2cap_chan_put(chan); |
6ff5abbf GP |
426 | } |
427 | ||
bd4b1653 AE |
428 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
429 | { | |
430 | chan->fcs = L2CAP_FCS_CRC16; | |
431 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
432 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
434 | chan->sec_level = BT_SECURITY_LOW; | |
435 | ||
436 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
437 | } | |
438 | ||
14a28491 | 439 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 440 | { |
af05b30b | 441 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 442 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 443 | |
9f5a0d7b | 444 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 445 | |
8c1d787b | 446 | chan->conn = conn; |
0139418c | 447 | |
5491120e AE |
448 | switch (chan->chan_type) { |
449 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
450 | if (conn->hcon->type == LE_LINK) { |
451 | /* LE connection */ | |
0c1bc5c6 | 452 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
453 | chan->scid = L2CAP_CID_LE_DATA; |
454 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
455 | } else { |
456 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 457 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 458 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 459 | } |
5491120e AE |
460 | break; |
461 | ||
462 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 463 | /* Connectionless socket */ |
fe4128e0 GP |
464 | chan->scid = L2CAP_CID_CONN_LESS; |
465 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 466 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
467 | break; |
468 | ||
469 | default: | |
0139418c | 470 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
471 | chan->scid = L2CAP_CID_SIGNALING; |
472 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 473 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
474 | } |
475 | ||
8f7975b1 AE |
476 | chan->local_id = L2CAP_BESTEFFORT_ID; |
477 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
478 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
479 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
480 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
481 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
482 | ||
371fd835 | 483 | l2cap_chan_hold(chan); |
baa7e1fa | 484 | |
3df91ea2 | 485 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
486 | } |
487 | ||
14a28491 | 488 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
489 | { |
490 | mutex_lock(&conn->chan_lock); | |
491 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 492 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
493 | } |
494 | ||
4519de9a | 495 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 496 | { |
48454079 | 497 | struct sock *sk = chan->sk; |
8c1d787b | 498 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
499 | struct sock *parent = bt_sk(sk)->parent; |
500 | ||
c9b66675 | 501 | __clear_chan_timer(chan); |
0139418c | 502 | |
49208c9c | 503 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 504 | |
8e87d142 | 505 | if (conn) { |
baa7e1fa | 506 | /* Delete from channel list */ |
3df91ea2 | 507 | list_del(&chan->list); |
3d57dc68 | 508 | |
371fd835 | 509 | l2cap_chan_put(chan); |
baa7e1fa | 510 | |
8c1d787b | 511 | chan->conn = NULL; |
0139418c MH |
512 | hci_conn_put(conn->hcon); |
513 | } | |
514 | ||
6be36555 AE |
515 | lock_sock(sk); |
516 | ||
0e587be7 | 517 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
518 | sock_set_flag(sk, SOCK_ZAPPED); |
519 | ||
520 | if (err) | |
2e0052e4 | 521 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
522 | |
523 | if (parent) { | |
524 | bt_accept_unlink(sk); | |
525 | parent->sk_data_ready(parent, 0); | |
526 | } else | |
527 | sk->sk_state_change(sk); | |
c13ffa62 | 528 | |
6be36555 AE |
529 | release_sock(sk); |
530 | ||
2827011f | 531 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 532 | return; |
2ead70b8 | 533 | |
58d35f87 | 534 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 535 | |
0c1bc5c6 | 536 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
537 | struct srej_list *l, *tmp; |
538 | ||
1a09bcb9 GP |
539 | __clear_retrans_timer(chan); |
540 | __clear_monitor_timer(chan); | |
541 | __clear_ack_timer(chan); | |
c13ffa62 | 542 | |
f1c6775b | 543 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 544 | |
3c588192 MM |
545 | l2cap_seq_list_free(&chan->srej_list); |
546 | l2cap_seq_list_free(&chan->retrans_list); | |
39d5a3ee | 547 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
548 | list_del(&l->list); |
549 | kfree(l); | |
550 | } | |
551 | } | |
0139418c MH |
552 | } |
553 | ||
4519de9a GP |
554 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
555 | { | |
556 | struct sock *sk; | |
557 | ||
558 | BT_DBG("parent %p", parent); | |
559 | ||
560 | /* Close not yet accepted channels */ | |
0f852724 | 561 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 562 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 563 | |
6be36555 | 564 | l2cap_chan_lock(chan); |
c9b66675 | 565 | __clear_chan_timer(chan); |
ba3bd0ee | 566 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 567 | l2cap_chan_unlock(chan); |
3df91ea2 | 568 | |
ba3bd0ee | 569 | chan->ops->close(chan->data); |
0f852724 | 570 | } |
4519de9a GP |
571 | } |
572 | ||
0f852724 | 573 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
574 | { |
575 | struct l2cap_conn *conn = chan->conn; | |
576 | struct sock *sk = chan->sk; | |
577 | ||
e05dcc32 AE |
578 | BT_DBG("chan %p state %s sk %p", chan, |
579 | state_to_string(chan->state), sk); | |
4519de9a | 580 | |
89bc500e | 581 | switch (chan->state) { |
4519de9a | 582 | case BT_LISTEN: |
6be36555 | 583 | lock_sock(sk); |
4519de9a | 584 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 585 | |
0e587be7 | 586 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 587 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 588 | release_sock(sk); |
4519de9a GP |
589 | break; |
590 | ||
591 | case BT_CONNECTED: | |
592 | case BT_CONFIG: | |
715ec005 | 593 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 594 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 595 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
596 | l2cap_send_disconn_req(conn, chan, reason); |
597 | } else | |
598 | l2cap_chan_del(chan, reason); | |
599 | break; | |
600 | ||
601 | case BT_CONNECT2: | |
715ec005 | 602 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
603 | conn->hcon->type == ACL_LINK) { |
604 | struct l2cap_conn_rsp rsp; | |
605 | __u16 result; | |
606 | ||
c5daa683 | 607 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
608 | result = L2CAP_CR_SEC_BLOCK; |
609 | else | |
610 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 611 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
612 | |
613 | rsp.scid = cpu_to_le16(chan->dcid); | |
614 | rsp.dcid = cpu_to_le16(chan->scid); | |
615 | rsp.result = cpu_to_le16(result); | |
616 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
617 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
618 | sizeof(rsp), &rsp); | |
619 | } | |
620 | ||
621 | l2cap_chan_del(chan, reason); | |
622 | break; | |
623 | ||
624 | case BT_CONNECT: | |
625 | case BT_DISCONN: | |
626 | l2cap_chan_del(chan, reason); | |
627 | break; | |
628 | ||
629 | default: | |
6be36555 | 630 | lock_sock(sk); |
4519de9a | 631 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 632 | release_sock(sk); |
4519de9a GP |
633 | break; |
634 | } | |
635 | } | |
636 | ||
4343478f | 637 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 638 | { |
715ec005 | 639 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 640 | switch (chan->sec_level) { |
8556edd3 JH |
641 | case BT_SECURITY_HIGH: |
642 | return HCI_AT_DEDICATED_BONDING_MITM; | |
643 | case BT_SECURITY_MEDIUM: | |
644 | return HCI_AT_DEDICATED_BONDING; | |
645 | default: | |
646 | return HCI_AT_NO_BONDING; | |
647 | } | |
fe4128e0 | 648 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
649 | if (chan->sec_level == BT_SECURITY_LOW) |
650 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 651 | |
4343478f | 652 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 653 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 654 | else |
8556edd3 | 655 | return HCI_AT_NO_BONDING; |
00ae4af9 | 656 | } else { |
4343478f | 657 | switch (chan->sec_level) { |
00ae4af9 | 658 | case BT_SECURITY_HIGH: |
8556edd3 | 659 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 660 | case BT_SECURITY_MEDIUM: |
8556edd3 | 661 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 662 | default: |
8556edd3 | 663 | return HCI_AT_NO_BONDING; |
00ae4af9 | 664 | } |
0684e5f9 | 665 | } |
8556edd3 JH |
666 | } |
667 | ||
668 | /* Service level security */ | |
d45fc423 | 669 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 670 | { |
8c1d787b | 671 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
672 | __u8 auth_type; |
673 | ||
4343478f | 674 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 675 | |
4343478f | 676 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
677 | } |
678 | ||
b5ad8b7f | 679 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
680 | { |
681 | u8 id; | |
682 | ||
683 | /* Get next available identificator. | |
684 | * 1 - 128 are used by kernel. | |
685 | * 129 - 199 are reserved. | |
686 | * 200 - 254 are used by utilities like l2ping, etc. | |
687 | */ | |
688 | ||
333055f2 | 689 | spin_lock(&conn->lock); |
4e8402a3 MH |
690 | |
691 | if (++conn->tx_ident > 128) | |
692 | conn->tx_ident = 1; | |
693 | ||
694 | id = conn->tx_ident; | |
695 | ||
333055f2 | 696 | spin_unlock(&conn->lock); |
4e8402a3 MH |
697 | |
698 | return id; | |
699 | } | |
700 | ||
4519de9a | 701 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
702 | { |
703 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 704 | u8 flags; |
4e8402a3 MH |
705 | |
706 | BT_DBG("code 0x%2.2x", code); | |
707 | ||
708 | if (!skb) | |
9a9c6a34 | 709 | return; |
4e8402a3 | 710 | |
e702112f AE |
711 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
712 | flags = ACL_START_NO_FLUSH; | |
713 | else | |
714 | flags = ACL_START; | |
715 | ||
14b12d0b | 716 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 717 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 718 | |
73d80deb LAD |
719 | hci_send_acl(conn->hchan, skb, flags); |
720 | } | |
721 | ||
722 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
723 | { | |
724 | struct hci_conn *hcon = chan->conn->hcon; | |
725 | u16 flags; | |
726 | ||
727 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
728 | skb->priority); | |
729 | ||
730 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
731 | lmp_no_flush_capable(hcon->hdev)) | |
732 | flags = ACL_START_NO_FLUSH; | |
733 | else | |
734 | flags = ACL_START; | |
14b12d0b | 735 | |
73d80deb LAD |
736 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
737 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
738 | } |
739 | ||
b76bbd66 MM |
740 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
741 | { | |
742 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
743 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
744 | ||
745 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
746 | /* S-Frame */ | |
747 | control->sframe = 1; | |
748 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
749 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
750 | ||
751 | control->sar = 0; | |
752 | control->txseq = 0; | |
753 | } else { | |
754 | /* I-Frame */ | |
755 | control->sframe = 0; | |
756 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
757 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
758 | ||
759 | control->poll = 0; | |
760 | control->super = 0; | |
761 | } | |
762 | } | |
763 | ||
b76bbd66 MM |
764 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
765 | { | |
766 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
767 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
768 | ||
769 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
770 | /* S-Frame */ | |
771 | control->sframe = 1; | |
772 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
773 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
774 | ||
775 | control->sar = 0; | |
776 | control->txseq = 0; | |
777 | } else { | |
778 | /* I-Frame */ | |
779 | control->sframe = 0; | |
780 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
781 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
782 | ||
783 | control->poll = 0; | |
784 | control->super = 0; | |
785 | } | |
786 | } | |
787 | ||
788 | static inline void __unpack_control(struct l2cap_chan *chan, | |
789 | struct sk_buff *skb) | |
790 | { | |
791 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
792 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
793 | &bt_cb(skb)->control); | |
cec8ab6e | 794 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
795 | } else { |
796 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
797 | &bt_cb(skb)->control); | |
cec8ab6e | 798 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
799 | } |
800 | } | |
801 | ||
b5c6aaed MM |
802 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
803 | { | |
804 | u32 packed; | |
805 | ||
806 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
807 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
808 | ||
809 | if (control->sframe) { | |
810 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
811 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
812 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
813 | } else { | |
814 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
815 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
816 | } | |
817 | ||
818 | return packed; | |
819 | } | |
820 | ||
821 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
822 | { | |
823 | u16 packed; | |
824 | ||
825 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
826 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
827 | ||
828 | if (control->sframe) { | |
829 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
830 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
831 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
832 | } else { | |
833 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
834 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
835 | } | |
836 | ||
837 | return packed; | |
838 | } | |
839 | ||
b76bbd66 MM |
840 | static inline void __pack_control(struct l2cap_chan *chan, |
841 | struct l2cap_ctrl *control, | |
842 | struct sk_buff *skb) | |
843 | { | |
844 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
845 | put_unaligned_le32(__pack_extended_control(control), | |
846 | skb->data + L2CAP_HDR_SIZE); | |
847 | } else { | |
848 | put_unaligned_le16(__pack_enhanced_control(control), | |
849 | skb->data + L2CAP_HDR_SIZE); | |
850 | } | |
851 | } | |
852 | ||
a67d7f6f MM |
853 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
854 | u32 control) | |
b5c6aaed MM |
855 | { |
856 | struct sk_buff *skb; | |
857 | struct l2cap_hdr *lh; | |
a67d7f6f | 858 | int hlen; |
b5c6aaed MM |
859 | |
860 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
861 | hlen = L2CAP_EXT_HDR_SIZE; | |
862 | else | |
863 | hlen = L2CAP_ENH_HDR_SIZE; | |
864 | ||
865 | if (chan->fcs == L2CAP_FCS_CRC16) | |
866 | hlen += L2CAP_FCS_SIZE; | |
867 | ||
a67d7f6f | 868 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 869 | |
b5c6aaed | 870 | if (!skb) |
a67d7f6f | 871 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
872 | |
873 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
874 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
875 | lh->cid = cpu_to_le16(chan->dcid); | |
876 | ||
a67d7f6f MM |
877 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
878 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
879 | else | |
880 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
881 | |
882 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 883 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
884 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
885 | } | |
886 | ||
887 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
888 | return skb; |
889 | } | |
890 | ||
891 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
892 | struct l2cap_ctrl *control) | |
893 | { | |
894 | struct sk_buff *skb; | |
895 | u32 control_field; | |
896 | ||
897 | BT_DBG("chan %p, control %p", chan, control); | |
898 | ||
899 | if (!control->sframe) | |
900 | return; | |
901 | ||
902 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
903 | !control->poll) | |
904 | control->final = 1; | |
905 | ||
906 | if (control->super == L2CAP_SUPER_RR) | |
907 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
908 | else if (control->super == L2CAP_SUPER_RNR) | |
909 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
910 | ||
911 | if (control->super != L2CAP_SUPER_SREJ) { | |
912 | chan->last_acked_seq = control->reqseq; | |
913 | __clear_ack_timer(chan); | |
914 | } | |
915 | ||
916 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
917 | control->final, control->poll, control->super); | |
918 | ||
919 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
920 | control_field = __pack_extended_control(control); | |
921 | else | |
922 | control_field = __pack_enhanced_control(control); | |
923 | ||
924 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
925 | if (!IS_ERR(skb)) | |
926 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
927 | } |
928 | ||
929 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) | |
930 | { | |
931 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
932 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); | |
933 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
934 | } else | |
935 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
936 | ||
937 | control |= __set_reqseq(chan, chan->buffer_seq); | |
b5c6aaed MM |
938 | } |
939 | ||
b4450035 | 940 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 941 | { |
c1360a1c | 942 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
943 | } |
944 | ||
9b27f350 AE |
945 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
946 | { | |
947 | struct l2cap_conn *conn = chan->conn; | |
948 | struct l2cap_conn_req req; | |
949 | ||
950 | req.scid = cpu_to_le16(chan->scid); | |
951 | req.psm = chan->psm; | |
952 | ||
953 | chan->ident = l2cap_get_ident(conn); | |
954 | ||
955 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
956 | ||
957 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
958 | } | |
959 | ||
9f0caeb1 VCG |
960 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
961 | { | |
962 | struct sock *sk = chan->sk; | |
963 | struct sock *parent; | |
964 | ||
965 | lock_sock(sk); | |
966 | ||
967 | parent = bt_sk(sk)->parent; | |
968 | ||
969 | BT_DBG("sk %p, parent %p", sk, parent); | |
970 | ||
2827011f | 971 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
972 | chan->conf_state = 0; |
973 | __clear_chan_timer(chan); | |
974 | ||
975 | __l2cap_state_change(chan, BT_CONNECTED); | |
976 | sk->sk_state_change(sk); | |
977 | ||
978 | if (parent) | |
979 | parent->sk_data_ready(parent, 0); | |
980 | ||
981 | release_sock(sk); | |
982 | } | |
983 | ||
fc7f8a7e | 984 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 985 | { |
8c1d787b | 986 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 987 | |
9f0caeb1 VCG |
988 | if (conn->hcon->type == LE_LINK) { |
989 | l2cap_chan_ready(chan); | |
990 | return; | |
991 | } | |
992 | ||
79d554a6 | 993 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
994 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
995 | return; | |
996 | ||
d45fc423 | 997 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
998 | __l2cap_no_conn_pending(chan)) |
999 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
1000 | } else { |
1001 | struct l2cap_info_req req; | |
1002 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1003 | ||
1004 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1005 | conn->info_ident = l2cap_get_ident(conn); | |
1006 | ||
ba13ccd9 | 1007 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
1008 | |
1009 | l2cap_send_cmd(conn, conn->info_ident, | |
1010 | L2CAP_INFO_REQ, sizeof(req), &req); | |
1011 | } | |
1012 | } | |
1013 | ||
cf6c2c0b GP |
1014 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1015 | { | |
1016 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1017 | if (!disable_ertm) |
cf6c2c0b GP |
1018 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1019 | ||
1020 | switch (mode) { | |
1021 | case L2CAP_MODE_ERTM: | |
1022 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1023 | case L2CAP_MODE_STREAMING: | |
1024 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1025 | default: | |
1026 | return 0x00; | |
1027 | } | |
1028 | } | |
1029 | ||
4519de9a | 1030 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1031 | { |
6be36555 | 1032 | struct sock *sk = chan->sk; |
22121fc9 GP |
1033 | struct l2cap_disconn_req req; |
1034 | ||
c13ffa62 GP |
1035 | if (!conn) |
1036 | return; | |
1037 | ||
0c1bc5c6 | 1038 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1039 | __clear_retrans_timer(chan); |
1040 | __clear_monitor_timer(chan); | |
1041 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1042 | } |
1043 | ||
fe4128e0 GP |
1044 | req.dcid = cpu_to_le16(chan->dcid); |
1045 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1046 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1047 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1048 | |
6be36555 | 1049 | lock_sock(sk); |
0e587be7 | 1050 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1051 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1052 | release_sock(sk); |
22121fc9 GP |
1053 | } |
1054 | ||
1da177e4 | 1055 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1056 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1057 | { | |
3df91ea2 | 1058 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1059 | |
1060 | BT_DBG("conn %p", conn); | |
1061 | ||
3df91ea2 | 1062 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1063 | |
3df91ea2 | 1064 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1065 | struct sock *sk = chan->sk; |
baa7e1fa | 1066 | |
6be36555 | 1067 | l2cap_chan_lock(chan); |
4e8402a3 | 1068 | |
715ec005 | 1069 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1070 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1071 | continue; |
1072 | } | |
1073 | ||
89bc500e | 1074 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1075 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1076 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1077 | l2cap_chan_unlock(chan); |
47731de7 GP |
1078 | continue; |
1079 | } | |
79d554a6 | 1080 | |
c1360a1c GP |
1081 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1082 | && test_bit(CONF_STATE2_DEVICE, | |
1083 | &chan->conf_state)) { | |
89bc500e | 1084 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1085 | l2cap_chan_unlock(chan); |
47731de7 | 1086 | continue; |
b1235d79 | 1087 | } |
47731de7 | 1088 | |
9b27f350 | 1089 | l2cap_send_conn_req(chan); |
47731de7 | 1090 | |
89bc500e | 1091 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1092 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1093 | char buf[128]; |
fe4128e0 GP |
1094 | rsp.scid = cpu_to_le16(chan->dcid); |
1095 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1096 | |
d45fc423 | 1097 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1098 | lock_sock(sk); |
c5daa683 GP |
1099 | if (test_bit(BT_SK_DEFER_SETUP, |
1100 | &bt_sk(sk)->flags)) { | |
f66dc81f MH |
1101 | struct sock *parent = bt_sk(sk)->parent; |
1102 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1103 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1104 | if (parent) |
1105 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1106 | |
1107 | } else { | |
0e587be7 | 1108 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
1109 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1110 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1111 | } | |
6be36555 | 1112 | release_sock(sk); |
79d554a6 MH |
1113 | } else { |
1114 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1115 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
1116 | } | |
1117 | ||
fc7f8a7e GP |
1118 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1119 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1120 | |
c1360a1c | 1121 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1122 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1123 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1124 | continue; |
1125 | } | |
1126 | ||
c1360a1c | 1127 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1128 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1129 | l2cap_build_conf_req(chan, buf), buf); |
1130 | chan->num_conf_req++; | |
4e8402a3 MH |
1131 | } |
1132 | ||
6be36555 | 1133 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1134 | } |
1135 | ||
3df91ea2 | 1136 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1137 | } |
1138 | ||
c2287681 | 1139 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1140 | * Returns closest match, locked. |
1141 | */ | |
d9b88702 | 1142 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1143 | bdaddr_t *src, |
1144 | bdaddr_t *dst) | |
b62f328b | 1145 | { |
23691d75 | 1146 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1147 | |
23691d75 | 1148 | read_lock(&chan_list_lock); |
b62f328b | 1149 | |
23691d75 GP |
1150 | list_for_each_entry(c, &chan_list, global_l) { |
1151 | struct sock *sk = c->sk; | |
fe4128e0 | 1152 | |
89bc500e | 1153 | if (state && c->state != state) |
b62f328b VT |
1154 | continue; |
1155 | ||
23691d75 | 1156 | if (c->scid == cid) { |
c2287681 IY |
1157 | int src_match, dst_match; |
1158 | int src_any, dst_any; | |
1159 | ||
b62f328b | 1160 | /* Exact match. */ |
c2287681 IY |
1161 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1162 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1163 | if (src_match && dst_match) { | |
23691d75 GP |
1164 | read_unlock(&chan_list_lock); |
1165 | return c; | |
1166 | } | |
b62f328b VT |
1167 | |
1168 | /* Closest match */ | |
c2287681 IY |
1169 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1170 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1171 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1172 | (src_any && dst_any)) | |
23691d75 | 1173 | c1 = c; |
b62f328b VT |
1174 | } |
1175 | } | |
280f294f | 1176 | |
23691d75 | 1177 | read_unlock(&chan_list_lock); |
b62f328b | 1178 | |
23691d75 | 1179 | return c1; |
b62f328b VT |
1180 | } |
1181 | ||
1182 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1183 | { | |
c916fbe4 | 1184 | struct sock *parent, *sk; |
23691d75 | 1185 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1186 | |
1187 | BT_DBG(""); | |
1188 | ||
1189 | /* Check if we have socket listening on cid */ | |
23691d75 | 1190 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1191 | conn->src, conn->dst); |
23691d75 | 1192 | if (!pchan) |
b62f328b VT |
1193 | return; |
1194 | ||
23691d75 GP |
1195 | parent = pchan->sk; |
1196 | ||
aa2ac881 | 1197 | lock_sock(parent); |
62f3a2cf | 1198 | |
b62f328b VT |
1199 | /* Check for backlog size */ |
1200 | if (sk_acceptq_is_full(parent)) { | |
1201 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1202 | goto clean; | |
1203 | } | |
1204 | ||
80808e43 GP |
1205 | chan = pchan->ops->new_connection(pchan->data); |
1206 | if (!chan) | |
b62f328b VT |
1207 | goto clean; |
1208 | ||
80808e43 | 1209 | sk = chan->sk; |
5d41ce1d | 1210 | |
b62f328b VT |
1211 | hci_conn_hold(conn->hcon); |
1212 | ||
b62f328b VT |
1213 | bacpy(&bt_sk(sk)->src, conn->src); |
1214 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1215 | ||
d1010240 GP |
1216 | bt_accept_enqueue(parent, sk); |
1217 | ||
3d57dc68 | 1218 | l2cap_chan_add(conn, chan); |
48454079 | 1219 | |
c9b66675 | 1220 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1221 | |
0e587be7 | 1222 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1223 | parent->sk_data_ready(parent, 0); |
1224 | ||
b62f328b | 1225 | clean: |
aa2ac881 | 1226 | release_sock(parent); |
b62f328b VT |
1227 | } |
1228 | ||
4e8402a3 MH |
1229 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1230 | { | |
48454079 | 1231 | struct l2cap_chan *chan; |
4e8402a3 | 1232 | |
79d554a6 | 1233 | BT_DBG("conn %p", conn); |
4e8402a3 | 1234 | |
b62f328b VT |
1235 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1236 | l2cap_le_conn_ready(conn); | |
1237 | ||
160dc6ac VCG |
1238 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1239 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1240 | ||
3df91ea2 | 1241 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1242 | |
3df91ea2 | 1243 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1244 | |
6be36555 | 1245 | l2cap_chan_lock(chan); |
4e8402a3 | 1246 | |
63128451 | 1247 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1248 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1249 | l2cap_chan_ready(chan); |
acd7d370 | 1250 | |
63128451 | 1251 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1252 | struct sock *sk = chan->sk; |
c9b66675 | 1253 | __clear_chan_timer(chan); |
6be36555 | 1254 | lock_sock(sk); |
0e587be7 | 1255 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1256 | sk->sk_state_change(sk); |
6be36555 | 1257 | release_sock(sk); |
b501d6a1 | 1258 | |
89bc500e | 1259 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1260 | l2cap_do_start(chan); |
4e8402a3 | 1261 | |
6be36555 | 1262 | l2cap_chan_unlock(chan); |
4e8402a3 | 1263 | } |
79d554a6 | 1264 | |
3df91ea2 | 1265 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1266 | } |
1267 | ||
1268 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1269 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1270 | { | |
48454079 | 1271 | struct l2cap_chan *chan; |
4e8402a3 MH |
1272 | |
1273 | BT_DBG("conn %p", conn); | |
1274 | ||
3df91ea2 | 1275 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1276 | |
3df91ea2 | 1277 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1278 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1279 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1280 | } |
1281 | ||
3df91ea2 | 1282 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1283 | } |
1284 | ||
f878fcad | 1285 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1286 | { |
f878fcad | 1287 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1288 | info_timer.work); |
4e8402a3 | 1289 | |
984947dc | 1290 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1291 | conn->info_ident = 0; |
984947dc | 1292 | |
4e8402a3 MH |
1293 | l2cap_conn_start(conn); |
1294 | } | |
1295 | ||
5d3de7df VCG |
1296 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1297 | { | |
1298 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1299 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1300 | |
1301 | if (!conn) | |
1302 | return; | |
1303 | ||
1304 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1305 | ||
1306 | kfree_skb(conn->rx_skb); | |
1307 | ||
3df91ea2 AE |
1308 | mutex_lock(&conn->chan_lock); |
1309 | ||
5d3de7df VCG |
1310 | /* Kill channels */ |
1311 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1312 | l2cap_chan_hold(chan); |
6be36555 AE |
1313 | l2cap_chan_lock(chan); |
1314 | ||
5d3de7df | 1315 | l2cap_chan_del(chan, err); |
6be36555 AE |
1316 | |
1317 | l2cap_chan_unlock(chan); | |
1318 | ||
5d3de7df | 1319 | chan->ops->close(chan->data); |
61d6ef3e | 1320 | l2cap_chan_put(chan); |
5d3de7df VCG |
1321 | } |
1322 | ||
3df91ea2 AE |
1323 | mutex_unlock(&conn->chan_lock); |
1324 | ||
73d80deb LAD |
1325 | hci_chan_del(conn->hchan); |
1326 | ||
5d3de7df | 1327 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1328 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1329 | |
51a8efd7 | 1330 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1331 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1332 | smp_chan_destroy(conn); |
d26a2345 | 1333 | } |
5d3de7df VCG |
1334 | |
1335 | hcon->l2cap_data = NULL; | |
1336 | kfree(conn); | |
1337 | } | |
1338 | ||
6c9d42a1 | 1339 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1340 | { |
6c9d42a1 GP |
1341 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1342 | security_timer.work); | |
5d3de7df VCG |
1343 | |
1344 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1345 | } | |
1346 | ||
1da177e4 LT |
1347 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1348 | { | |
0139418c | 1349 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1350 | struct hci_chan *hchan; |
1da177e4 | 1351 | |
0139418c | 1352 | if (conn || status) |
1da177e4 LT |
1353 | return conn; |
1354 | ||
73d80deb LAD |
1355 | hchan = hci_chan_create(hcon); |
1356 | if (!hchan) | |
1357 | return NULL; | |
1358 | ||
0139418c | 1359 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1360 | if (!conn) { |
1361 | hci_chan_del(hchan); | |
1da177e4 | 1362 | return NULL; |
73d80deb | 1363 | } |
1da177e4 LT |
1364 | |
1365 | hcon->l2cap_data = conn; | |
1366 | conn->hcon = hcon; | |
73d80deb | 1367 | conn->hchan = hchan; |
1da177e4 | 1368 | |
73d80deb | 1369 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1370 | |
acd7d370 VT |
1371 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1372 | conn->mtu = hcon->hdev->le_mtu; | |
1373 | else | |
1374 | conn->mtu = hcon->hdev->acl_mtu; | |
1375 | ||
1da177e4 LT |
1376 | conn->src = &hcon->hdev->bdaddr; |
1377 | conn->dst = &hcon->dst; | |
1378 | ||
4e8402a3 MH |
1379 | conn->feat_mask = 0; |
1380 | ||
1da177e4 | 1381 | spin_lock_init(&conn->lock); |
3df91ea2 | 1382 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1383 | |
1384 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1385 | |
5d3de7df | 1386 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1387 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1388 | else |
030013d8 | 1389 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1390 | |
9f5a0d7b | 1391 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1392 | |
1da177e4 LT |
1393 | return conn; |
1394 | } | |
1395 | ||
1da177e4 | 1396 | /* ---- Socket interface ---- */ |
1da177e4 | 1397 | |
c2287681 | 1398 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1399 | * Returns closest match. |
1400 | */ | |
c2287681 IY |
1401 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1402 | bdaddr_t *src, | |
1403 | bdaddr_t *dst) | |
1da177e4 | 1404 | { |
23691d75 | 1405 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1406 | |
23691d75 | 1407 | read_lock(&chan_list_lock); |
e0f0cb56 | 1408 | |
23691d75 GP |
1409 | list_for_each_entry(c, &chan_list, global_l) { |
1410 | struct sock *sk = c->sk; | |
fe4128e0 | 1411 | |
89bc500e | 1412 | if (state && c->state != state) |
1da177e4 LT |
1413 | continue; |
1414 | ||
23691d75 | 1415 | if (c->psm == psm) { |
c2287681 IY |
1416 | int src_match, dst_match; |
1417 | int src_any, dst_any; | |
1418 | ||
1da177e4 | 1419 | /* Exact match. */ |
c2287681 IY |
1420 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1421 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1422 | if (src_match && dst_match) { | |
a7567b20 | 1423 | read_unlock(&chan_list_lock); |
23691d75 GP |
1424 | return c; |
1425 | } | |
1da177e4 LT |
1426 | |
1427 | /* Closest match */ | |
c2287681 IY |
1428 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1429 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1430 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1431 | (src_any && dst_any)) | |
23691d75 | 1432 | c1 = c; |
1da177e4 LT |
1433 | } |
1434 | } | |
1da177e4 | 1435 | |
23691d75 | 1436 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1437 | |
23691d75 | 1438 | return c1; |
1da177e4 LT |
1439 | } |
1440 | ||
8e9f9892 AG |
1441 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1442 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1443 | { |
5d41ce1d | 1444 | struct sock *sk = chan->sk; |
1da177e4 | 1445 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1446 | struct l2cap_conn *conn; |
1447 | struct hci_conn *hcon; | |
1448 | struct hci_dev *hdev; | |
09ab6f4c | 1449 | __u8 auth_type; |
44d0e48e | 1450 | int err; |
1da177e4 | 1451 | |
8e9f9892 AG |
1452 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1453 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1454 | |
af05b30b GP |
1455 | hdev = hci_get_route(dst, src); |
1456 | if (!hdev) | |
1da177e4 LT |
1457 | return -EHOSTUNREACH; |
1458 | ||
09fd0de5 | 1459 | hci_dev_lock(hdev); |
1da177e4 | 1460 | |
6be36555 | 1461 | l2cap_chan_lock(chan); |
03a00194 GP |
1462 | |
1463 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1464 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1465 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1466 | err = -EINVAL; | |
1467 | goto done; | |
1468 | } | |
1469 | ||
1470 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1471 | err = -EINVAL; | |
1472 | goto done; | |
1473 | } | |
1474 | ||
1475 | switch (chan->mode) { | |
1476 | case L2CAP_MODE_BASIC: | |
1477 | break; | |
1478 | case L2CAP_MODE_ERTM: | |
1479 | case L2CAP_MODE_STREAMING: | |
1480 | if (!disable_ertm) | |
1481 | break; | |
1482 | /* fall through */ | |
1483 | default: | |
1484 | err = -ENOTSUPP; | |
1485 | goto done; | |
1486 | } | |
1487 | ||
6be36555 AE |
1488 | lock_sock(sk); |
1489 | ||
03a00194 GP |
1490 | switch (sk->sk_state) { |
1491 | case BT_CONNECT: | |
1492 | case BT_CONNECT2: | |
1493 | case BT_CONFIG: | |
1494 | /* Already connecting */ | |
1495 | err = 0; | |
6be36555 | 1496 | release_sock(sk); |
03a00194 GP |
1497 | goto done; |
1498 | ||
1499 | case BT_CONNECTED: | |
1500 | /* Already connected */ | |
1501 | err = -EISCONN; | |
6be36555 | 1502 | release_sock(sk); |
03a00194 GP |
1503 | goto done; |
1504 | ||
1505 | case BT_OPEN: | |
1506 | case BT_BOUND: | |
1507 | /* Can connect */ | |
1508 | break; | |
1509 | ||
1510 | default: | |
1511 | err = -EBADFD; | |
6be36555 | 1512 | release_sock(sk); |
03a00194 GP |
1513 | goto done; |
1514 | } | |
1515 | ||
1516 | /* Set destination address and psm */ | |
9219b2a0 | 1517 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1518 | |
1519 | release_sock(sk); | |
1520 | ||
03a00194 GP |
1521 | chan->psm = psm; |
1522 | chan->dcid = cid; | |
1da177e4 | 1523 | |
4343478f | 1524 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1525 | |
fe4128e0 | 1526 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1527 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1528 | chan->sec_level, auth_type); |
acd7d370 | 1529 | else |
8e9f9892 | 1530 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1531 | chan->sec_level, auth_type); |
acd7d370 | 1532 | |
30e76272 VT |
1533 | if (IS_ERR(hcon)) { |
1534 | err = PTR_ERR(hcon); | |
1da177e4 | 1535 | goto done; |
30e76272 | 1536 | } |
1da177e4 LT |
1537 | |
1538 | conn = l2cap_conn_add(hcon, 0); | |
1539 | if (!conn) { | |
1540 | hci_conn_put(hcon); | |
30e76272 | 1541 | err = -ENOMEM; |
1da177e4 LT |
1542 | goto done; |
1543 | } | |
1544 | ||
9f0caeb1 VCG |
1545 | if (hcon->type == LE_LINK) { |
1546 | err = 0; | |
1547 | ||
1548 | if (!list_empty(&conn->chan_l)) { | |
1549 | err = -EBUSY; | |
1550 | hci_conn_put(hcon); | |
1551 | } | |
1552 | ||
1553 | if (err) | |
1554 | goto done; | |
1555 | } | |
1556 | ||
1da177e4 LT |
1557 | /* Update source addr of the socket */ |
1558 | bacpy(src, conn->src); | |
1559 | ||
6be36555 | 1560 | l2cap_chan_unlock(chan); |
48454079 | 1561 | l2cap_chan_add(conn, chan); |
6be36555 | 1562 | l2cap_chan_lock(chan); |
48454079 | 1563 | |
6be36555 | 1564 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1565 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1566 | |
1567 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1568 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1569 | __clear_chan_timer(chan); |
d45fc423 | 1570 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1571 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1572 | } else |
fc7f8a7e | 1573 | l2cap_do_start(chan); |
1da177e4 LT |
1574 | } |
1575 | ||
30e76272 VT |
1576 | err = 0; |
1577 | ||
1da177e4 | 1578 | done: |
6be36555 | 1579 | l2cap_chan_unlock(chan); |
09fd0de5 | 1580 | hci_dev_unlock(hdev); |
1da177e4 LT |
1581 | hci_dev_put(hdev); |
1582 | return err; | |
1583 | } | |
1584 | ||
dcba0dba | 1585 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1586 | { |
8c1d787b | 1587 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1588 | DECLARE_WAITQUEUE(wait, current); |
1589 | int err = 0; | |
1590 | int timeo = HZ/5; | |
1591 | ||
2b0b05dd | 1592 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1593 | set_current_state(TASK_INTERRUPTIBLE); |
1594 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1595 | if (!timeo) |
1596 | timeo = HZ/5; | |
1597 | ||
1598 | if (signal_pending(current)) { | |
1599 | err = sock_intr_errno(timeo); | |
1600 | break; | |
1601 | } | |
1602 | ||
1603 | release_sock(sk); | |
1604 | timeo = schedule_timeout(timeo); | |
1605 | lock_sock(sk); | |
a71a0cf4 | 1606 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1607 | |
1608 | err = sock_error(sk); | |
1609 | if (err) | |
1610 | break; | |
1611 | } | |
1612 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1613 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1614 | return err; |
1615 | } | |
1616 | ||
721c4181 | 1617 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1618 | { |
721c4181 GP |
1619 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1620 | monitor_timer.work); | |
e90bac06 | 1621 | |
525cd185 | 1622 | BT_DBG("chan %p", chan); |
0e98958d | 1623 | |
6be36555 AE |
1624 | l2cap_chan_lock(chan); |
1625 | ||
2c03a7a4 | 1626 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1627 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1628 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1629 | l2cap_chan_put(chan); |
e90bac06 GP |
1630 | return; |
1631 | } | |
1632 | ||
6a026610 | 1633 | chan->retry_count++; |
1a09bcb9 | 1634 | __set_monitor_timer(chan); |
e90bac06 | 1635 | |
525cd185 | 1636 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1637 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1638 | l2cap_chan_put(chan); |
e90bac06 GP |
1639 | } |
1640 | ||
721c4181 | 1641 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1642 | { |
721c4181 GP |
1643 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1644 | retrans_timer.work); | |
e90bac06 | 1645 | |
49208c9c | 1646 | BT_DBG("chan %p", chan); |
0e98958d | 1647 | |
6be36555 AE |
1648 | l2cap_chan_lock(chan); |
1649 | ||
6a026610 | 1650 | chan->retry_count = 1; |
1a09bcb9 | 1651 | __set_monitor_timer(chan); |
e90bac06 | 1652 | |
e2ab4353 | 1653 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1654 | |
525cd185 | 1655 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1656 | |
1657 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1658 | l2cap_chan_put(chan); |
e90bac06 GP |
1659 | } |
1660 | ||
42e5c802 | 1661 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1662 | { |
1c2acffb | 1663 | struct sk_buff *skb; |
1da177e4 | 1664 | |
58d35f87 | 1665 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1666 | chan->unacked_frames) { |
3ce3514f | 1667 | if (bt_cb(skb)->control.txseq == chan->expected_ack_seq) |
1c2acffb | 1668 | break; |
1da177e4 | 1669 | |
58d35f87 | 1670 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1671 | kfree_skb(skb); |
1da177e4 | 1672 | |
6a026610 | 1673 | chan->unacked_frames--; |
1c2acffb | 1674 | } |
1da177e4 | 1675 | |
6a026610 | 1676 | if (!chan->unacked_frames) |
1a09bcb9 | 1677 | __clear_retrans_timer(chan); |
1c2acffb | 1678 | } |
1da177e4 | 1679 | |
3733937d MM |
1680 | static int l2cap_streaming_send(struct l2cap_chan *chan, |
1681 | struct sk_buff_head *skbs) | |
6840ed07 | 1682 | { |
ccbb84af | 1683 | struct sk_buff *skb; |
3733937d | 1684 | struct l2cap_ctrl *control; |
6840ed07 | 1685 | |
3733937d MM |
1686 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1687 | ||
1688 | if (chan->state != BT_CONNECTED) | |
1689 | return -ENOTCONN; | |
1690 | ||
1691 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
1692 | ||
1693 | while (!skb_queue_empty(&chan->tx_q)) { | |
1694 | ||
1695 | skb = skb_dequeue(&chan->tx_q); | |
1696 | ||
1697 | bt_cb(skb)->control.retries = 1; | |
1698 | control = &bt_cb(skb)->control; | |
1699 | ||
1700 | control->reqseq = 0; | |
1701 | control->txseq = chan->next_tx_seq; | |
1702 | ||
1703 | __pack_control(chan, control, skb); | |
6840ed07 | 1704 | |
47d1ec61 | 1705 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1706 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1707 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1708 | } |
1709 | ||
4343478f | 1710 | l2cap_do_send(chan, skb); |
6840ed07 | 1711 | |
3733937d MM |
1712 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1713 | ||
836be934 | 1714 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1715 | chan->frames_sent++; |
6840ed07 | 1716 | } |
3733937d MM |
1717 | |
1718 | return 0; | |
6840ed07 GP |
1719 | } |
1720 | ||
fb45de7d | 1721 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1722 | { |
8f17154f | 1723 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1724 | u16 fcs; |
1725 | u32 control; | |
8f17154f | 1726 | |
58d35f87 | 1727 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1728 | if (!skb) |
1729 | return; | |
8f17154f | 1730 | |
3ce3514f | 1731 | while (bt_cb(skb)->control.txseq != tx_seq) { |
58d35f87 | 1732 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1733 | return; |
8f17154f | 1734 | |
d1726b6d SJ |
1735 | skb = skb_queue_next(&chan->tx_q, skb); |
1736 | } | |
8f17154f | 1737 | |
3ce3514f MM |
1738 | if (bt_cb(skb)->control.retries == chan->remote_max_tx && |
1739 | chan->remote_max_tx) { | |
8c1d787b | 1740 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1741 | return; |
1742 | } | |
1743 | ||
1744 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
3ce3514f | 1745 | bt_cb(skb)->control.retries++; |
88843ab0 AE |
1746 | |
1747 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1748 | control &= __get_sar_mask(chan); |
3cb123d1 | 1749 | |
e2ab4353 | 1750 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1751 | control |= __set_ctrl_final(chan); |
95ffa978 | 1752 | |
0b209fae | 1753 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1754 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1755 | |
88843ab0 | 1756 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1757 | |
47d1ec61 | 1758 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1759 | fcs = crc16(0, (u8 *)tx_skb->data, |
1760 | tx_skb->len - L2CAP_FCS_SIZE); | |
1761 | put_unaligned_le16(fcs, | |
1762 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1763 | } |
1764 | ||
4343478f | 1765 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1766 | } |
1767 | ||
67c9e840 | 1768 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1769 | { |
1770 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1771 | struct l2cap_ctrl *control; |
1772 | int sent = 0; | |
1773 | ||
1774 | BT_DBG("chan %p", chan); | |
1c2acffb | 1775 | |
89bc500e | 1776 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1777 | return -ENOTCONN; |
e90bac06 | 1778 | |
94122bbe MM |
1779 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1780 | return 0; | |
1781 | ||
18a48e76 MM |
1782 | while (chan->tx_send_head && |
1783 | chan->unacked_frames < chan->remote_tx_win && | |
1784 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1785 | |
18a48e76 | 1786 | skb = chan->tx_send_head; |
e90bac06 | 1787 | |
18a48e76 MM |
1788 | bt_cb(skb)->control.retries = 1; |
1789 | control = &bt_cb(skb)->control; | |
95ffa978 | 1790 | |
e2ab4353 | 1791 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1792 | control->final = 1; |
e2ab4353 | 1793 | |
18a48e76 MM |
1794 | control->reqseq = chan->buffer_seq; |
1795 | chan->last_acked_seq = chan->buffer_seq; | |
1796 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1797 | |
18a48e76 | 1798 | __pack_control(chan, control, skb); |
e90bac06 | 1799 | |
47d1ec61 | 1800 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1801 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1802 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1803 | } |
1804 | ||
18a48e76 MM |
1805 | /* Clone after data has been modified. Data is assumed to be |
1806 | read-only (for locking purposes) on cloned sk_buffs. | |
1807 | */ | |
1808 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1809 | |
18a48e76 MM |
1810 | if (!tx_skb) |
1811 | break; | |
1c2acffb | 1812 | |
18a48e76 | 1813 | __set_retrans_timer(chan); |
836be934 AE |
1814 | |
1815 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1816 | chan->unacked_frames++; |
6a026610 | 1817 | chan->frames_sent++; |
18a48e76 | 1818 | sent++; |
1c2acffb | 1819 | |
58d35f87 GP |
1820 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1821 | chan->tx_send_head = NULL; | |
1c2acffb | 1822 | else |
58d35f87 | 1823 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1824 | |
1825 | l2cap_do_send(chan, tx_skb); | |
1826 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1827 | } |
1828 | ||
18a48e76 MM |
1829 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1830 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1831 | ||
1832 | return sent; | |
9e917af1 GP |
1833 | } |
1834 | ||
525cd185 | 1835 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1836 | { |
dfc909be GP |
1837 | int ret; |
1838 | ||
58d35f87 GP |
1839 | if (!skb_queue_empty(&chan->tx_q)) |
1840 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1841 | |
42e5c802 | 1842 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1843 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1844 | return ret; |
1845 | } | |
1846 | ||
b17e73bb | 1847 | static void __l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1848 | { |
88843ab0 | 1849 | u32 control = 0; |
9e917af1 | 1850 | |
0b209fae | 1851 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1852 | |
e2ab4353 | 1853 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1854 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1855 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
9a9c6a34 | 1856 | return; |
9e917af1 | 1857 | } |
dfc909be | 1858 | |
525cd185 | 1859 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1860 | return; |
1861 | ||
ab784b73 | 1862 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
1c2acffb GP |
1863 | } |
1864 | ||
b17e73bb SJ |
1865 | static void l2cap_send_ack(struct l2cap_chan *chan) |
1866 | { | |
1867 | __clear_ack_timer(chan); | |
1868 | __l2cap_send_ack(chan); | |
1869 | } | |
1870 | ||
525cd185 | 1871 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1872 | { |
1873 | struct srej_list *tail; | |
88843ab0 | 1874 | u32 control; |
99b0d4b7 | 1875 | |
ab784b73 | 1876 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1877 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1878 | |
39d5a3ee | 1879 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1880 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 GP |
1881 | } |
1882 | ||
04124681 GP |
1883 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1884 | struct msghdr *msg, int len, | |
1885 | int count, struct sk_buff *skb) | |
1c2acffb | 1886 | { |
0952a57a | 1887 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1888 | struct sk_buff **frag; |
90338947 | 1889 | int sent = 0; |
1da177e4 | 1890 | |
59203a21 | 1891 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1892 | return -EFAULT; |
1da177e4 LT |
1893 | |
1894 | sent += count; | |
1895 | len -= count; | |
1896 | ||
1897 | /* Continuation fragments (no L2CAP header) */ | |
1898 | frag = &skb_shinfo(skb)->frag_list; | |
1899 | while (len) { | |
fbe00700 GP |
1900 | struct sk_buff *tmp; |
1901 | ||
1da177e4 LT |
1902 | count = min_t(unsigned int, conn->mtu, len); |
1903 | ||
fbe00700 GP |
1904 | tmp = chan->ops->alloc_skb(chan, count, |
1905 | msg->msg_flags & MSG_DONTWAIT); | |
1906 | if (IS_ERR(tmp)) | |
1907 | return PTR_ERR(tmp); | |
1908 | ||
1909 | *frag = tmp; | |
2f7719ce | 1910 | |
1c2acffb GP |
1911 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1912 | return -EFAULT; | |
1da177e4 | 1913 | |
5e59b791 LAD |
1914 | (*frag)->priority = skb->priority; |
1915 | ||
1da177e4 LT |
1916 | sent += count; |
1917 | len -= count; | |
1918 | ||
2d0ed3d5 GP |
1919 | skb->len += (*frag)->len; |
1920 | skb->data_len += (*frag)->len; | |
1921 | ||
1da177e4 LT |
1922 | frag = &(*frag)->next; |
1923 | } | |
1da177e4 LT |
1924 | |
1925 | return sent; | |
1c2acffb | 1926 | } |
1da177e4 | 1927 | |
5e59b791 LAD |
1928 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1929 | struct msghdr *msg, size_t len, | |
1930 | u32 priority) | |
1c2acffb | 1931 | { |
8c1d787b | 1932 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1933 | struct sk_buff *skb; |
03a51213 | 1934 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1935 | struct l2cap_hdr *lh; |
1936 | ||
6d5922b0 | 1937 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1938 | |
1939 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1940 | |
1941 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1942 | msg->msg_flags & MSG_DONTWAIT); |
1943 | if (IS_ERR(skb)) | |
1944 | return skb; | |
1c2acffb | 1945 | |
5e59b791 LAD |
1946 | skb->priority = priority; |
1947 | ||
1c2acffb GP |
1948 | /* Create L2CAP header */ |
1949 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1950 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1951 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1952 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1953 | |
0952a57a | 1954 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1955 | if (unlikely(err < 0)) { |
1956 | kfree_skb(skb); | |
1957 | return ERR_PTR(err); | |
1958 | } | |
1959 | return skb; | |
1960 | } | |
1961 | ||
5e59b791 LAD |
1962 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1963 | struct msghdr *msg, size_t len, | |
1964 | u32 priority) | |
1c2acffb | 1965 | { |
8c1d787b | 1966 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1967 | struct sk_buff *skb; |
f2ba7fae | 1968 | int err, count; |
1c2acffb GP |
1969 | struct l2cap_hdr *lh; |
1970 | ||
6d5922b0 | 1971 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1972 | |
f2ba7fae | 1973 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1974 | |
f2ba7fae | 1975 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1976 | msg->msg_flags & MSG_DONTWAIT); |
1977 | if (IS_ERR(skb)) | |
1978 | return skb; | |
1c2acffb | 1979 | |
5e59b791 LAD |
1980 | skb->priority = priority; |
1981 | ||
1c2acffb GP |
1982 | /* Create L2CAP header */ |
1983 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1984 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1985 | lh->len = cpu_to_le16(len); |
1c2acffb | 1986 | |
0952a57a | 1987 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1988 | if (unlikely(err < 0)) { |
1989 | kfree_skb(skb); | |
1990 | return ERR_PTR(err); | |
1991 | } | |
1992 | return skb; | |
1993 | } | |
1994 | ||
ab0ff76d LAD |
1995 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1996 | struct msghdr *msg, size_t len, | |
94122bbe | 1997 | u16 sdulen) |
1c2acffb | 1998 | { |
8c1d787b | 1999 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2000 | struct sk_buff *skb; |
e4ca6d98 | 2001 | int err, count, hlen; |
1c2acffb GP |
2002 | struct l2cap_hdr *lh; |
2003 | ||
6d5922b0 | 2004 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 2005 | |
0ee0d208 GP |
2006 | if (!conn) |
2007 | return ERR_PTR(-ENOTCONN); | |
2008 | ||
e4ca6d98 AE |
2009 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2010 | hlen = L2CAP_EXT_HDR_SIZE; | |
2011 | else | |
2012 | hlen = L2CAP_ENH_HDR_SIZE; | |
2013 | ||
c74e560c | 2014 | if (sdulen) |
03a51213 | 2015 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2016 | |
47d1ec61 | 2017 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2018 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2019 | |
1c2acffb | 2020 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2021 | |
2022 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2023 | msg->msg_flags & MSG_DONTWAIT); |
2024 | if (IS_ERR(skb)) | |
2025 | return skb; | |
1c2acffb GP |
2026 | |
2027 | /* Create L2CAP header */ | |
2028 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2029 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2030 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2031 | |
18a48e76 MM |
2032 | /* Control header is populated later */ |
2033 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2034 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2035 | else | |
2036 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2037 | |
c74e560c | 2038 | if (sdulen) |
03a51213 | 2039 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2040 | |
0952a57a | 2041 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2042 | if (unlikely(err < 0)) { |
2043 | kfree_skb(skb); | |
2044 | return ERR_PTR(err); | |
2045 | } | |
e90bac06 | 2046 | |
18a48e76 | 2047 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2048 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2049 | return skb; |
1da177e4 LT |
2050 | } |
2051 | ||
94122bbe MM |
2052 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2053 | struct sk_buff_head *seg_queue, | |
2054 | struct msghdr *msg, size_t len) | |
c74e560c | 2055 | { |
c74e560c | 2056 | struct sk_buff *skb; |
94122bbe MM |
2057 | u16 sdu_len; |
2058 | size_t pdu_len; | |
2059 | int err = 0; | |
2060 | u8 sar; | |
c74e560c | 2061 | |
94122bbe | 2062 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2063 | |
94122bbe MM |
2064 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2065 | * so fragmented skbs are not used. The HCI layer's handling | |
2066 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2067 | */ | |
c74e560c | 2068 | |
94122bbe MM |
2069 | /* PDU size is derived from the HCI MTU */ |
2070 | pdu_len = chan->conn->mtu; | |
c74e560c | 2071 | |
94122bbe MM |
2072 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2073 | ||
2074 | /* Adjust for largest possible L2CAP overhead. */ | |
2075 | pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE; | |
2076 | ||
2077 | /* Remote device may have requested smaller PDUs */ | |
2078 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2079 | ||
2080 | if (len <= pdu_len) { | |
2081 | sar = L2CAP_SAR_UNSEGMENTED; | |
2082 | sdu_len = 0; | |
2083 | pdu_len = len; | |
2084 | } else { | |
2085 | sar = L2CAP_SAR_START; | |
2086 | sdu_len = len; | |
2087 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2088 | } | |
2089 | ||
2090 | while (len > 0) { | |
2091 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2092 | |
c74e560c | 2093 | if (IS_ERR(skb)) { |
94122bbe | 2094 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2095 | return PTR_ERR(skb); |
2096 | } | |
2097 | ||
94122bbe MM |
2098 | bt_cb(skb)->control.sar = sar; |
2099 | __skb_queue_tail(seg_queue, skb); | |
2100 | ||
2101 | len -= pdu_len; | |
2102 | if (sdu_len) { | |
2103 | sdu_len = 0; | |
2104 | pdu_len += L2CAP_SDULEN_SIZE; | |
2105 | } | |
2106 | ||
2107 | if (len <= pdu_len) { | |
2108 | sar = L2CAP_SAR_END; | |
2109 | pdu_len = len; | |
2110 | } else { | |
2111 | sar = L2CAP_SAR_CONTINUE; | |
2112 | } | |
c74e560c | 2113 | } |
c74e560c | 2114 | |
94122bbe | 2115 | return err; |
c74e560c GP |
2116 | } |
2117 | ||
5e59b791 LAD |
2118 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2119 | u32 priority) | |
9a91a04a | 2120 | { |
9a91a04a | 2121 | struct sk_buff *skb; |
9a91a04a | 2122 | int err; |
94122bbe | 2123 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2124 | |
2125 | /* Connectionless channel */ | |
715ec005 | 2126 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2127 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2128 | if (IS_ERR(skb)) |
2129 | return PTR_ERR(skb); | |
2130 | ||
2131 | l2cap_do_send(chan, skb); | |
2132 | return len; | |
2133 | } | |
2134 | ||
2135 | switch (chan->mode) { | |
2136 | case L2CAP_MODE_BASIC: | |
2137 | /* Check outgoing MTU */ | |
2138 | if (len > chan->omtu) | |
2139 | return -EMSGSIZE; | |
2140 | ||
2141 | /* Create a basic PDU */ | |
5e59b791 | 2142 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2143 | if (IS_ERR(skb)) |
2144 | return PTR_ERR(skb); | |
2145 | ||
2146 | l2cap_do_send(chan, skb); | |
2147 | err = len; | |
2148 | break; | |
2149 | ||
2150 | case L2CAP_MODE_ERTM: | |
2151 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2152 | /* Check outgoing MTU */ |
2153 | if (len > chan->omtu) { | |
2154 | err = -EMSGSIZE; | |
2155 | break; | |
2156 | } | |
9a91a04a | 2157 | |
94122bbe | 2158 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2159 | |
94122bbe MM |
2160 | /* Do segmentation before calling in to the state machine, |
2161 | * since it's possible to block while waiting for memory | |
2162 | * allocation. | |
2163 | */ | |
2164 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2165 | |
94122bbe MM |
2166 | /* The channel could have been closed while segmenting, |
2167 | * check that it is still connected. | |
2168 | */ | |
2169 | if (chan->state != BT_CONNECTED) { | |
2170 | __skb_queue_purge(&seg_queue); | |
2171 | err = -ENOTCONN; | |
9a91a04a GP |
2172 | } |
2173 | ||
94122bbe | 2174 | if (err) |
9a91a04a | 2175 | break; |
9a91a04a | 2176 | |
3733937d | 2177 | if (chan->mode == L2CAP_MODE_ERTM) |
608bcc6d MM |
2178 | err = l2cap_tx(chan, 0, &seg_queue, |
2179 | L2CAP_EV_DATA_REQUEST); | |
3733937d MM |
2180 | else |
2181 | err = l2cap_streaming_send(chan, &seg_queue); | |
9a91a04a | 2182 | |
608bcc6d | 2183 | if (!err) |
9a91a04a GP |
2184 | err = len; |
2185 | ||
94122bbe MM |
2186 | /* If the skbs were not queued for sending, they'll still be in |
2187 | * seg_queue and need to be purged. | |
2188 | */ | |
2189 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2190 | break; |
2191 | ||
2192 | default: | |
2193 | BT_DBG("bad state %1.1x", chan->mode); | |
2194 | err = -EBADFD; | |
2195 | } | |
2196 | ||
2197 | return err; | |
2198 | } | |
2199 | ||
608bcc6d MM |
2200 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2201 | { | |
2202 | struct sk_buff *acked_skb; | |
2203 | u16 ackseq; | |
2204 | ||
2205 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2206 | ||
2207 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2208 | return; | |
2209 | ||
2210 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2211 | chan->expected_ack_seq, chan->unacked_frames); | |
2212 | ||
2213 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2214 | ackseq = __next_seq(chan, ackseq)) { | |
2215 | ||
2216 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2217 | if (acked_skb) { | |
2218 | skb_unlink(acked_skb, &chan->tx_q); | |
2219 | kfree_skb(acked_skb); | |
2220 | chan->unacked_frames--; | |
2221 | } | |
2222 | } | |
2223 | ||
2224 | chan->expected_ack_seq = reqseq; | |
2225 | ||
2226 | if (chan->unacked_frames == 0) | |
2227 | __clear_retrans_timer(chan); | |
2228 | ||
2229 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2230 | } | |
2231 | ||
2232 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2233 | { | |
2234 | BT_DBG("chan %p", chan); | |
2235 | ||
2236 | chan->expected_tx_seq = chan->buffer_seq; | |
2237 | l2cap_seq_list_clear(&chan->srej_list); | |
2238 | skb_queue_purge(&chan->srej_q); | |
2239 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2240 | } | |
2241 | ||
2242 | static int l2cap_tx_state_xmit(struct l2cap_chan *chan, | |
2243 | struct l2cap_ctrl *control, | |
2244 | struct sk_buff_head *skbs, u8 event) | |
2245 | { | |
2246 | int err = 0; | |
2247 | ||
2248 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2249 | event); | |
2250 | ||
2251 | switch (event) { | |
2252 | case L2CAP_EV_DATA_REQUEST: | |
2253 | if (chan->tx_send_head == NULL) | |
2254 | chan->tx_send_head = skb_peek(skbs); | |
2255 | ||
2256 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2257 | l2cap_ertm_send(chan); | |
2258 | break; | |
2259 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2260 | BT_DBG("Enter LOCAL_BUSY"); | |
2261 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2262 | ||
2263 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2264 | /* The SREJ_SENT state must be aborted if we are to | |
2265 | * enter the LOCAL_BUSY state. | |
2266 | */ | |
2267 | l2cap_abort_rx_srej_sent(chan); | |
2268 | } | |
2269 | ||
2270 | l2cap_send_ack(chan); | |
2271 | ||
2272 | break; | |
2273 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2274 | BT_DBG("Exit LOCAL_BUSY"); | |
2275 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2276 | ||
2277 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2278 | struct l2cap_ctrl local_control; | |
2279 | ||
2280 | memset(&local_control, 0, sizeof(local_control)); | |
2281 | local_control.sframe = 1; | |
2282 | local_control.super = L2CAP_SUPER_RR; | |
2283 | local_control.poll = 1; | |
2284 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2285 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2286 | |
2287 | chan->retry_count = 1; | |
2288 | __set_monitor_timer(chan); | |
2289 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2290 | } | |
2291 | break; | |
2292 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2293 | l2cap_process_reqseq(chan, control->reqseq); | |
2294 | break; | |
2295 | case L2CAP_EV_EXPLICIT_POLL: | |
2296 | l2cap_send_rr_or_rnr(chan, 1); | |
2297 | chan->retry_count = 1; | |
2298 | __set_monitor_timer(chan); | |
2299 | __clear_ack_timer(chan); | |
2300 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2301 | break; | |
2302 | case L2CAP_EV_RETRANS_TO: | |
2303 | l2cap_send_rr_or_rnr(chan, 1); | |
2304 | chan->retry_count = 1; | |
2305 | __set_monitor_timer(chan); | |
2306 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2307 | break; | |
2308 | case L2CAP_EV_RECV_FBIT: | |
2309 | /* Nothing to process */ | |
2310 | break; | |
2311 | default: | |
2312 | break; | |
2313 | } | |
2314 | ||
2315 | return err; | |
2316 | } | |
2317 | ||
2318 | static int l2cap_tx_state_wait_f(struct l2cap_chan *chan, | |
2319 | struct l2cap_ctrl *control, | |
2320 | struct sk_buff_head *skbs, u8 event) | |
2321 | { | |
2322 | int err = 0; | |
2323 | ||
2324 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2325 | event); | |
2326 | ||
2327 | switch (event) { | |
2328 | case L2CAP_EV_DATA_REQUEST: | |
2329 | if (chan->tx_send_head == NULL) | |
2330 | chan->tx_send_head = skb_peek(skbs); | |
2331 | /* Queue data, but don't send. */ | |
2332 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2333 | break; | |
2334 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2335 | BT_DBG("Enter LOCAL_BUSY"); | |
2336 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2337 | ||
2338 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2339 | /* The SREJ_SENT state must be aborted if we are to | |
2340 | * enter the LOCAL_BUSY state. | |
2341 | */ | |
2342 | l2cap_abort_rx_srej_sent(chan); | |
2343 | } | |
2344 | ||
2345 | l2cap_send_ack(chan); | |
2346 | ||
2347 | break; | |
2348 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2349 | BT_DBG("Exit LOCAL_BUSY"); | |
2350 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2351 | ||
2352 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2353 | struct l2cap_ctrl local_control; | |
2354 | memset(&local_control, 0, sizeof(local_control)); | |
2355 | local_control.sframe = 1; | |
2356 | local_control.super = L2CAP_SUPER_RR; | |
2357 | local_control.poll = 1; | |
2358 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2359 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2360 | |
2361 | chan->retry_count = 1; | |
2362 | __set_monitor_timer(chan); | |
2363 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2364 | } | |
2365 | break; | |
2366 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2367 | l2cap_process_reqseq(chan, control->reqseq); | |
2368 | ||
2369 | /* Fall through */ | |
2370 | ||
2371 | case L2CAP_EV_RECV_FBIT: | |
2372 | if (control && control->final) { | |
2373 | __clear_monitor_timer(chan); | |
2374 | if (chan->unacked_frames > 0) | |
2375 | __set_retrans_timer(chan); | |
2376 | chan->retry_count = 0; | |
2377 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2378 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2379 | } | |
2380 | break; | |
2381 | case L2CAP_EV_EXPLICIT_POLL: | |
2382 | /* Ignore */ | |
2383 | break; | |
2384 | case L2CAP_EV_MONITOR_TO: | |
2385 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2386 | l2cap_send_rr_or_rnr(chan, 1); | |
2387 | __set_monitor_timer(chan); | |
2388 | chan->retry_count++; | |
2389 | } else { | |
2390 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2391 | } | |
2392 | break; | |
2393 | default: | |
2394 | break; | |
2395 | } | |
2396 | ||
2397 | return err; | |
2398 | } | |
2399 | ||
2400 | static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
2401 | struct sk_buff_head *skbs, u8 event) | |
2402 | { | |
2403 | int err = 0; | |
2404 | ||
2405 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", | |
2406 | chan, control, skbs, event, chan->tx_state); | |
2407 | ||
2408 | switch (chan->tx_state) { | |
2409 | case L2CAP_TX_STATE_XMIT: | |
2410 | err = l2cap_tx_state_xmit(chan, control, skbs, event); | |
2411 | break; | |
2412 | case L2CAP_TX_STATE_WAIT_F: | |
2413 | err = l2cap_tx_state_wait_f(chan, control, skbs, event); | |
2414 | break; | |
2415 | default: | |
2416 | /* Ignore event */ | |
2417 | break; | |
2418 | } | |
2419 | ||
2420 | return err; | |
2421 | } | |
2422 | ||
1da177e4 LT |
2423 | /* Copy frame to all raw sockets on that connection */ |
2424 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2425 | { | |
1da177e4 | 2426 | struct sk_buff *nskb; |
48454079 | 2427 | struct l2cap_chan *chan; |
1da177e4 LT |
2428 | |
2429 | BT_DBG("conn %p", conn); | |
2430 | ||
3df91ea2 | 2431 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2432 | |
3df91ea2 | 2433 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2434 | struct sock *sk = chan->sk; |
715ec005 | 2435 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2436 | continue; |
2437 | ||
2438 | /* Don't send frame to the socket it came from */ | |
2439 | if (skb->sk == sk) | |
2440 | continue; | |
af05b30b GP |
2441 | nskb = skb_clone(skb, GFP_ATOMIC); |
2442 | if (!nskb) | |
1da177e4 LT |
2443 | continue; |
2444 | ||
23070494 | 2445 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2446 | kfree_skb(nskb); |
2447 | } | |
3d57dc68 | 2448 | |
3df91ea2 | 2449 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2450 | } |
2451 | ||
2452 | /* ---- L2CAP signalling commands ---- */ | |
2453 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2454 | u8 code, u8 ident, u16 dlen, void *data) | |
2455 | { | |
2456 | struct sk_buff *skb, **frag; | |
2457 | struct l2cap_cmd_hdr *cmd; | |
2458 | struct l2cap_hdr *lh; | |
2459 | int len, count; | |
2460 | ||
af05b30b GP |
2461 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2462 | conn, code, ident, dlen); | |
1da177e4 LT |
2463 | |
2464 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2465 | count = min_t(unsigned int, conn->mtu, len); | |
2466 | ||
2467 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2468 | if (!skb) | |
2469 | return NULL; | |
2470 | ||
2471 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2472 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2473 | |
2474 | if (conn->hcon->type == LE_LINK) | |
2475 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
2476 | else | |
2477 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
2478 | |
2479 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2480 | cmd->code = code; | |
2481 | cmd->ident = ident; | |
aca3192c | 2482 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2483 | |
2484 | if (dlen) { | |
2485 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2486 | memcpy(skb_put(skb, count), data, count); | |
2487 | data += count; | |
2488 | } | |
2489 | ||
2490 | len -= skb->len; | |
2491 | ||
2492 | /* Continuation fragments (no L2CAP header) */ | |
2493 | frag = &skb_shinfo(skb)->frag_list; | |
2494 | while (len) { | |
2495 | count = min_t(unsigned int, conn->mtu, len); | |
2496 | ||
2497 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2498 | if (!*frag) | |
2499 | goto fail; | |
2500 | ||
2501 | memcpy(skb_put(*frag, count), data, count); | |
2502 | ||
2503 | len -= count; | |
2504 | data += count; | |
2505 | ||
2506 | frag = &(*frag)->next; | |
2507 | } | |
2508 | ||
2509 | return skb; | |
2510 | ||
2511 | fail: | |
2512 | kfree_skb(skb); | |
2513 | return NULL; | |
2514 | } | |
2515 | ||
2516 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2517 | { | |
2518 | struct l2cap_conf_opt *opt = *ptr; | |
2519 | int len; | |
2520 | ||
2521 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2522 | *ptr += len; | |
2523 | ||
2524 | *type = opt->type; | |
2525 | *olen = opt->len; | |
2526 | ||
2527 | switch (opt->len) { | |
2528 | case 1: | |
2529 | *val = *((u8 *) opt->val); | |
2530 | break; | |
2531 | ||
2532 | case 2: | |
bfaaeb3e | 2533 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2534 | break; |
2535 | ||
2536 | case 4: | |
bfaaeb3e | 2537 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2538 | break; |
2539 | ||
2540 | default: | |
2541 | *val = (unsigned long) opt->val; | |
2542 | break; | |
2543 | } | |
2544 | ||
2545 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2546 | return len; | |
2547 | } | |
2548 | ||
1da177e4 LT |
2549 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2550 | { | |
2551 | struct l2cap_conf_opt *opt = *ptr; | |
2552 | ||
2553 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2554 | ||
2555 | opt->type = type; | |
2556 | opt->len = len; | |
2557 | ||
2558 | switch (len) { | |
2559 | case 1: | |
2560 | *((u8 *) opt->val) = val; | |
2561 | break; | |
2562 | ||
2563 | case 2: | |
4f8b691c | 2564 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2565 | break; |
2566 | ||
2567 | case 4: | |
4f8b691c | 2568 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2569 | break; |
2570 | ||
2571 | default: | |
2572 | memcpy(opt->val, (void *) val, len); | |
2573 | break; | |
2574 | } | |
2575 | ||
2576 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2577 | } | |
2578 | ||
f89cef09 AE |
2579 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2580 | { | |
2581 | struct l2cap_conf_efs efs; | |
2582 | ||
1ec918ce | 2583 | switch (chan->mode) { |
f89cef09 AE |
2584 | case L2CAP_MODE_ERTM: |
2585 | efs.id = chan->local_id; | |
2586 | efs.stype = chan->local_stype; | |
2587 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2588 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2589 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2590 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2591 | break; | |
2592 | ||
2593 | case L2CAP_MODE_STREAMING: | |
2594 | efs.id = 1; | |
2595 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2596 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2597 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2598 | efs.acc_lat = 0; | |
2599 | efs.flush_to = 0; | |
2600 | break; | |
2601 | ||
2602 | default: | |
2603 | return; | |
2604 | } | |
2605 | ||
2606 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2607 | (unsigned long) &efs); | |
2608 | } | |
2609 | ||
721c4181 | 2610 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2611 | { |
721c4181 GP |
2612 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2613 | ack_timer.work); | |
c1b4f43b | 2614 | |
2fb9b3d4 GP |
2615 | BT_DBG("chan %p", chan); |
2616 | ||
6be36555 AE |
2617 | l2cap_chan_lock(chan); |
2618 | ||
b17e73bb | 2619 | __l2cap_send_ack(chan); |
6be36555 AE |
2620 | |
2621 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2622 | |
2623 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2624 | } |
2625 | ||
3c588192 | 2626 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2627 | { |
3c588192 MM |
2628 | int err; |
2629 | ||
105bdf9e MM |
2630 | chan->next_tx_seq = 0; |
2631 | chan->expected_tx_seq = 0; | |
42e5c802 | 2632 | chan->expected_ack_seq = 0; |
6a026610 | 2633 | chan->unacked_frames = 0; |
42e5c802 | 2634 | chan->buffer_seq = 0; |
6a026610 GP |
2635 | chan->num_acked = 0; |
2636 | chan->frames_sent = 0; | |
105bdf9e MM |
2637 | chan->last_acked_seq = 0; |
2638 | chan->sdu = NULL; | |
2639 | chan->sdu_last_frag = NULL; | |
2640 | chan->sdu_len = 0; | |
2641 | ||
d34c34fb MM |
2642 | skb_queue_head_init(&chan->tx_q); |
2643 | ||
105bdf9e MM |
2644 | if (chan->mode != L2CAP_MODE_ERTM) |
2645 | return 0; | |
2646 | ||
2647 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2648 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2649 | |
721c4181 GP |
2650 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2651 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2652 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2653 | |
f1c6775b | 2654 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2655 | |
39d5a3ee | 2656 | INIT_LIST_HEAD(&chan->srej_l); |
3c588192 MM |
2657 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2658 | if (err < 0) | |
2659 | return err; | |
2660 | ||
9dc9affc MM |
2661 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2662 | if (err < 0) | |
2663 | l2cap_seq_list_free(&chan->srej_list); | |
2664 | ||
2665 | return err; | |
0565c1c2 GP |
2666 | } |
2667 | ||
f2fcfcd6 GP |
2668 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2669 | { | |
2670 | switch (mode) { | |
2671 | case L2CAP_MODE_STREAMING: | |
2672 | case L2CAP_MODE_ERTM: | |
2673 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2674 | return mode; | |
2675 | /* fall through */ | |
2676 | default: | |
2677 | return L2CAP_MODE_BASIC; | |
2678 | } | |
2679 | } | |
2680 | ||
6327eb98 AE |
2681 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2682 | { | |
2683 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2684 | } | |
2685 | ||
f89cef09 AE |
2686 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2687 | { | |
2688 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2689 | } | |
2690 | ||
6327eb98 AE |
2691 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2692 | { | |
2693 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2694 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2695 | /* use extended control field */ |
2696 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2697 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2698 | } else { | |
6327eb98 AE |
2699 | chan->tx_win = min_t(u16, chan->tx_win, |
2700 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2701 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2702 | } | |
6327eb98 AE |
2703 | } |
2704 | ||
710f9b0a | 2705 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2706 | { |
1da177e4 | 2707 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2708 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2709 | void *ptr = req->data; |
c8f79162 | 2710 | u16 size; |
1da177e4 | 2711 | |
49208c9c | 2712 | BT_DBG("chan %p", chan); |
1da177e4 | 2713 | |
73ffa904 | 2714 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2715 | goto done; |
2716 | ||
0c1bc5c6 | 2717 | switch (chan->mode) { |
f2fcfcd6 GP |
2718 | case L2CAP_MODE_STREAMING: |
2719 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2720 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2721 | break; |
85eb53c6 | 2722 | |
f89cef09 AE |
2723 | if (__l2cap_efs_supported(chan)) |
2724 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2725 | ||
2ba13ed6 | 2726 | /* fall through */ |
f2fcfcd6 | 2727 | default: |
8c1d787b | 2728 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2729 | break; |
2730 | } | |
2731 | ||
2732 | done: | |
0c1bc5c6 GP |
2733 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2734 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2735 | |
0c1bc5c6 | 2736 | switch (chan->mode) { |
65c7c491 | 2737 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2738 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2739 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2740 | break; |
2741 | ||
62547752 GP |
2742 | rfc.mode = L2CAP_MODE_BASIC; |
2743 | rfc.txwin_size = 0; | |
2744 | rfc.max_transmit = 0; | |
2745 | rfc.retrans_timeout = 0; | |
2746 | rfc.monitor_timeout = 0; | |
2747 | rfc.max_pdu_size = 0; | |
2748 | ||
63406504 GP |
2749 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2750 | (unsigned long) &rfc); | |
65c7c491 MH |
2751 | break; |
2752 | ||
2753 | case L2CAP_MODE_ERTM: | |
2754 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2755 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2756 | rfc.retrans_timeout = 0; |
2757 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2758 | |
2759 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2760 | L2CAP_EXT_HDR_SIZE - | |
2761 | L2CAP_SDULEN_SIZE - | |
2762 | L2CAP_FCS_SIZE); | |
2763 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2764 | |
6327eb98 AE |
2765 | l2cap_txwin_setup(chan); |
2766 | ||
2767 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2768 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2769 | |
63406504 GP |
2770 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2771 | (unsigned long) &rfc); | |
2772 | ||
f89cef09 AE |
2773 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2774 | l2cap_add_opt_efs(&ptr, chan); | |
2775 | ||
8c1d787b | 2776 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2777 | break; |
2778 | ||
47d1ec61 | 2779 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2780 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2781 | chan->fcs = L2CAP_FCS_NONE; |
2782 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2783 | } |
6327eb98 AE |
2784 | |
2785 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2786 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2787 | chan->tx_win); | |
f2fcfcd6 GP |
2788 | break; |
2789 | ||
2790 | case L2CAP_MODE_STREAMING: | |
2791 | rfc.mode = L2CAP_MODE_STREAMING; | |
2792 | rfc.txwin_size = 0; | |
2793 | rfc.max_transmit = 0; | |
2794 | rfc.retrans_timeout = 0; | |
2795 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2796 | |
2797 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2798 | L2CAP_EXT_HDR_SIZE - | |
2799 | L2CAP_SDULEN_SIZE - | |
2800 | L2CAP_FCS_SIZE); | |
2801 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2802 | |
63406504 GP |
2803 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2804 | (unsigned long) &rfc); | |
2805 | ||
f89cef09 AE |
2806 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2807 | l2cap_add_opt_efs(&ptr, chan); | |
2808 | ||
8c1d787b | 2809 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2810 | break; |
2811 | ||
47d1ec61 | 2812 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2813 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2814 | chan->fcs = L2CAP_FCS_NONE; |
2815 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2816 | } |
65c7c491 MH |
2817 | break; |
2818 | } | |
1da177e4 | 2819 | |
fe4128e0 | 2820 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2821 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2822 | |
2823 | return ptr - data; | |
2824 | } | |
2825 | ||
73ffa904 | 2826 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2827 | { |
5dee9e7c MH |
2828 | struct l2cap_conf_rsp *rsp = data; |
2829 | void *ptr = rsp->data; | |
73ffa904 GP |
2830 | void *req = chan->conf_req; |
2831 | int len = chan->conf_len; | |
5dee9e7c MH |
2832 | int type, hint, olen; |
2833 | unsigned long val; | |
6464f35f | 2834 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2835 | struct l2cap_conf_efs efs; |
2836 | u8 remote_efs = 0; | |
861d6882 | 2837 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2838 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2839 | u16 size; |
1da177e4 | 2840 | |
73ffa904 | 2841 | BT_DBG("chan %p", chan); |
820ae1b8 | 2842 | |
5dee9e7c MH |
2843 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2844 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2845 | |
589d2746 | 2846 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2847 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2848 | |
2849 | switch (type) { | |
2850 | case L2CAP_CONF_MTU: | |
861d6882 | 2851 | mtu = val; |
5dee9e7c MH |
2852 | break; |
2853 | ||
2854 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2855 | chan->flush_to = val; |
5dee9e7c MH |
2856 | break; |
2857 | ||
2858 | case L2CAP_CONF_QOS: | |
2859 | break; | |
2860 | ||
6464f35f MH |
2861 | case L2CAP_CONF_RFC: |
2862 | if (olen == sizeof(rfc)) | |
2863 | memcpy(&rfc, (void *) val, olen); | |
2864 | break; | |
2865 | ||
fcc203c3 GP |
2866 | case L2CAP_CONF_FCS: |
2867 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2868 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2869 | break; |
fcc203c3 | 2870 | |
42dceae2 AE |
2871 | case L2CAP_CONF_EFS: |
2872 | remote_efs = 1; | |
2873 | if (olen == sizeof(efs)) | |
2874 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2875 | break; |
2876 | ||
6327eb98 AE |
2877 | case L2CAP_CONF_EWS: |
2878 | if (!enable_hs) | |
2879 | return -ECONNREFUSED; | |
fcc203c3 | 2880 | |
6327eb98 AE |
2881 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2882 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2883 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2884 | chan->remote_tx_win = val; |
fcc203c3 GP |
2885 | break; |
2886 | ||
5dee9e7c MH |
2887 | default: |
2888 | if (hint) | |
2889 | break; | |
2890 | ||
2891 | result = L2CAP_CONF_UNKNOWN; | |
2892 | *((u8 *) ptr++) = type; | |
2893 | break; | |
2894 | } | |
2895 | } | |
2896 | ||
73ffa904 | 2897 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2898 | goto done; |
2899 | ||
0c1bc5c6 | 2900 | switch (chan->mode) { |
f2fcfcd6 GP |
2901 | case L2CAP_MODE_STREAMING: |
2902 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2903 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2904 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2905 | chan->conn->feat_mask); |
85eb53c6 GP |
2906 | break; |
2907 | } | |
2908 | ||
42dceae2 AE |
2909 | if (remote_efs) { |
2910 | if (__l2cap_efs_supported(chan)) | |
2911 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2912 | else | |
2913 | return -ECONNREFUSED; | |
2914 | } | |
2915 | ||
0c1bc5c6 | 2916 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2917 | return -ECONNREFUSED; |
742e519b | 2918 | |
f2fcfcd6 | 2919 | break; |
f2fcfcd6 GP |
2920 | } |
2921 | ||
2922 | done: | |
0c1bc5c6 | 2923 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2924 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2925 | rfc.mode = chan->mode; |
f2fcfcd6 | 2926 | |
73ffa904 | 2927 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2928 | return -ECONNREFUSED; |
2929 | ||
2930 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2931 | sizeof(rfc), (unsigned long) &rfc); | |
2932 | } | |
2933 | ||
5dee9e7c MH |
2934 | if (result == L2CAP_CONF_SUCCESS) { |
2935 | /* Configure output options and let the other side know | |
2936 | * which ones we don't like. */ | |
2937 | ||
f2fcfcd6 GP |
2938 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2939 | result = L2CAP_CONF_UNACCEPT; | |
2940 | else { | |
0c1bc5c6 | 2941 | chan->omtu = mtu; |
c1360a1c | 2942 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2943 | } |
0c1bc5c6 | 2944 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2945 | |
42dceae2 AE |
2946 | if (remote_efs) { |
2947 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2948 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2949 | efs.stype != chan->local_stype) { | |
2950 | ||
2951 | result = L2CAP_CONF_UNACCEPT; | |
2952 | ||
2953 | if (chan->num_conf_req >= 1) | |
2954 | return -ECONNREFUSED; | |
2955 | ||
2956 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2957 | sizeof(efs), |
42dceae2 | 2958 | (unsigned long) &efs); |
0e8b207e | 2959 | } else { |
3e6b3b95 | 2960 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2961 | result = L2CAP_CONF_PENDING; |
2962 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2963 | } |
2964 | } | |
2965 | ||
f2fcfcd6 GP |
2966 | switch (rfc.mode) { |
2967 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2968 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2969 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2970 | break; |
2971 | ||
2972 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2973 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2974 | chan->remote_tx_win = rfc.txwin_size; | |
2975 | else | |
2976 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2977 | |
2c03a7a4 | 2978 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2979 | |
c8f79162 AE |
2980 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2981 | chan->conn->mtu - | |
2982 | L2CAP_EXT_HDR_SIZE - | |
2983 | L2CAP_SDULEN_SIZE - | |
2984 | L2CAP_FCS_SIZE); | |
2985 | rfc.max_pdu_size = cpu_to_le16(size); | |
2986 | chan->remote_mps = size; | |
f2fcfcd6 | 2987 | |
10467e9e | 2988 | rfc.retrans_timeout = |
4fd21a88 | 2989 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 2990 | rfc.monitor_timeout = |
4fd21a88 | 2991 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 2992 | |
c1360a1c | 2993 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2994 | |
2995 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2996 | sizeof(rfc), (unsigned long) &rfc); | |
2997 | ||
42dceae2 AE |
2998 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2999 | chan->remote_id = efs.id; | |
3000 | chan->remote_stype = efs.stype; | |
3001 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3002 | chan->remote_flush_to = | |
3003 | le32_to_cpu(efs.flush_to); | |
3004 | chan->remote_acc_lat = | |
3005 | le32_to_cpu(efs.acc_lat); | |
3006 | chan->remote_sdu_itime = | |
3007 | le32_to_cpu(efs.sdu_itime); | |
3008 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3009 | sizeof(efs), (unsigned long) &efs); | |
3010 | } | |
f2fcfcd6 GP |
3011 | break; |
3012 | ||
3013 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3014 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3015 | chan->conn->mtu - | |
3016 | L2CAP_EXT_HDR_SIZE - | |
3017 | L2CAP_SDULEN_SIZE - | |
3018 | L2CAP_FCS_SIZE); | |
3019 | rfc.max_pdu_size = cpu_to_le16(size); | |
3020 | chan->remote_mps = size; | |
f2fcfcd6 | 3021 | |
c1360a1c | 3022 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3023 | |
3024 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3025 | sizeof(rfc), (unsigned long) &rfc); | |
3026 | ||
f2fcfcd6 GP |
3027 | break; |
3028 | ||
3029 | default: | |
5dee9e7c | 3030 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3031 | |
6464f35f | 3032 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3033 | rfc.mode = chan->mode; |
f2fcfcd6 | 3034 | } |
6464f35f | 3035 | |
f2fcfcd6 | 3036 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3037 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3038 | } |
fe4128e0 | 3039 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
3040 | rsp->result = cpu_to_le16(result); |
3041 | rsp->flags = cpu_to_le16(0x0000); | |
3042 | ||
3043 | return ptr - data; | |
1da177e4 LT |
3044 | } |
3045 | ||
b4450035 | 3046 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3047 | { |
f2fcfcd6 GP |
3048 | struct l2cap_conf_req *req = data; |
3049 | void *ptr = req->data; | |
3050 | int type, olen; | |
3051 | unsigned long val; | |
36e999a8 | 3052 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3053 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3054 | |
fe4128e0 | 3055 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3056 | |
3057 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3058 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3059 | ||
3060 | switch (type) { | |
3061 | case L2CAP_CONF_MTU: | |
3062 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3063 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3064 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3065 | } else |
0c1bc5c6 GP |
3066 | chan->imtu = val; |
3067 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3068 | break; |
3069 | ||
3070 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3071 | chan->flush_to = val; |
f2fcfcd6 | 3072 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3073 | 2, chan->flush_to); |
f2fcfcd6 GP |
3074 | break; |
3075 | ||
3076 | case L2CAP_CONF_RFC: | |
3077 | if (olen == sizeof(rfc)) | |
3078 | memcpy(&rfc, (void *)val, olen); | |
3079 | ||
c1360a1c | 3080 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3081 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3082 | return -ECONNREFUSED; |
3083 | ||
47d1ec61 | 3084 | chan->fcs = 0; |
f2fcfcd6 GP |
3085 | |
3086 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3087 | sizeof(rfc), (unsigned long) &rfc); | |
3088 | break; | |
6327eb98 AE |
3089 | |
3090 | case L2CAP_CONF_EWS: | |
3091 | chan->tx_win = min_t(u16, val, | |
3092 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3093 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3094 | chan->tx_win); | |
6327eb98 | 3095 | break; |
66af7aaf AE |
3096 | |
3097 | case L2CAP_CONF_EFS: | |
3098 | if (olen == sizeof(efs)) | |
3099 | memcpy(&efs, (void *)val, olen); | |
3100 | ||
3101 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3102 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3103 | efs.stype != chan->local_stype) | |
3104 | return -ECONNREFUSED; | |
3105 | ||
3106 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3107 | sizeof(efs), (unsigned long) &efs); | |
3108 | break; | |
f2fcfcd6 GP |
3109 | } |
3110 | } | |
3111 | ||
0c1bc5c6 | 3112 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3113 | return -ECONNREFUSED; |
3114 | ||
0c1bc5c6 | 3115 | chan->mode = rfc.mode; |
6c2ea7a8 | 3116 | |
0e8b207e | 3117 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3118 | switch (rfc.mode) { |
3119 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3120 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3121 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3122 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3123 | |
3124 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3125 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3126 | chan->local_sdu_itime = | |
3127 | le32_to_cpu(efs.sdu_itime); | |
3128 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3129 | chan->local_flush_to = | |
3130 | le32_to_cpu(efs.flush_to); | |
3131 | } | |
f2fcfcd6 | 3132 | break; |
66af7aaf | 3133 | |
f2fcfcd6 | 3134 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3135 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3136 | } |
3137 | } | |
3138 | ||
fe4128e0 | 3139 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
3140 | req->flags = cpu_to_le16(0x0000); |
3141 | ||
3142 | return ptr - data; | |
3143 | } | |
3144 | ||
fe4128e0 | 3145 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3146 | { |
3147 | struct l2cap_conf_rsp *rsp = data; | |
3148 | void *ptr = rsp->data; | |
1da177e4 | 3149 | |
fe4128e0 | 3150 | BT_DBG("chan %p", chan); |
1da177e4 | 3151 | |
fe4128e0 | 3152 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3153 | rsp->result = cpu_to_le16(result); |
aca3192c | 3154 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3155 | |
3156 | return ptr - data; | |
3157 | } | |
3158 | ||
8c1d787b | 3159 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3160 | { |
3161 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3162 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3163 | u8 buf[128]; |
3164 | ||
fe4128e0 GP |
3165 | rsp.scid = cpu_to_le16(chan->dcid); |
3166 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
3167 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3168 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
3169 | l2cap_send_cmd(conn, chan->ident, | |
3170 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3171 | ||
c1360a1c | 3172 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3173 | return; |
3174 | ||
710f9b0a GP |
3175 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3176 | l2cap_build_conf_req(chan, buf), buf); | |
3177 | chan->num_conf_req++; | |
3178 | } | |
3179 | ||
47d1ec61 | 3180 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3181 | { |
7b1c0049 GP |
3182 | int type, olen; |
3183 | unsigned long val; | |
3184 | struct l2cap_conf_rfc rfc; | |
3185 | ||
47d1ec61 | 3186 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3187 | |
0c1bc5c6 | 3188 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3189 | return; |
3190 | ||
3191 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3192 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3193 | ||
3194 | switch (type) { | |
3195 | case L2CAP_CONF_RFC: | |
3196 | if (olen == sizeof(rfc)) | |
3197 | memcpy(&rfc, (void *)val, olen); | |
3198 | goto done; | |
3199 | } | |
3200 | } | |
3201 | ||
36e999a8 MM |
3202 | /* Use sane default values in case a misbehaving remote device |
3203 | * did not send an RFC option. | |
3204 | */ | |
3205 | rfc.mode = chan->mode; | |
3206 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3207 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3208 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
3209 | ||
3210 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3211 | ||
7b1c0049 GP |
3212 | done: |
3213 | switch (rfc.mode) { | |
3214 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3215 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3216 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3217 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3218 | break; |
3219 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3220 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3221 | } |
3222 | } | |
3223 | ||
4e8402a3 MH |
3224 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3225 | { | |
e2fd318e | 3226 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3227 | |
e2fd318e | 3228 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3229 | return 0; |
3230 | ||
3231 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3232 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3233 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3234 | |
3235 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3236 | conn->info_ident = 0; |
984947dc | 3237 | |
4e8402a3 MH |
3238 | l2cap_conn_start(conn); |
3239 | } | |
3240 | ||
3241 | return 0; | |
3242 | } | |
3243 | ||
1da177e4 LT |
3244 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3245 | { | |
1da177e4 LT |
3246 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3247 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3248 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3249 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3250 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3251 | |
3252 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3253 | __le16 psm = req->psm; |
1da177e4 | 3254 | |
097db76c | 3255 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3256 | |
3257 | /* Check if we have socket listening on psm */ | |
c2287681 | 3258 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3259 | if (!pchan) { |
1da177e4 LT |
3260 | result = L2CAP_CR_BAD_PSM; |
3261 | goto sendresp; | |
3262 | } | |
3263 | ||
23691d75 GP |
3264 | parent = pchan->sk; |
3265 | ||
3df91ea2 | 3266 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3267 | lock_sock(parent); |
e0f0cb56 | 3268 | |
e7c29cb1 MH |
3269 | /* Check if the ACL is secure enough (if not SDP) */ |
3270 | if (psm != cpu_to_le16(0x0001) && | |
3271 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 3272 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3273 | result = L2CAP_CR_SEC_BLOCK; |
3274 | goto response; | |
3275 | } | |
3276 | ||
1da177e4 LT |
3277 | result = L2CAP_CR_NO_MEM; |
3278 | ||
3279 | /* Check for backlog size */ | |
3280 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 3281 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
3282 | goto response; |
3283 | } | |
3284 | ||
80808e43 GP |
3285 | chan = pchan->ops->new_connection(pchan->data); |
3286 | if (!chan) | |
1da177e4 LT |
3287 | goto response; |
3288 | ||
80808e43 GP |
3289 | sk = chan->sk; |
3290 | ||
1da177e4 | 3291 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3292 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3293 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3294 | chan->ops->close(chan->data); |
1da177e4 LT |
3295 | goto response; |
3296 | } | |
3297 | ||
3298 | hci_conn_hold(conn->hcon); | |
3299 | ||
1da177e4 LT |
3300 | bacpy(&bt_sk(sk)->src, conn->src); |
3301 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3302 | chan->psm = psm; |
3303 | chan->dcid = scid; | |
1da177e4 | 3304 | |
d1010240 GP |
3305 | bt_accept_enqueue(parent, sk); |
3306 | ||
6be36555 | 3307 | __l2cap_chan_add(conn, chan); |
48454079 | 3308 | |
fe4128e0 | 3309 | dcid = chan->scid; |
1da177e4 | 3310 | |
c9b66675 | 3311 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3312 | |
fc7f8a7e | 3313 | chan->ident = cmd->ident; |
1da177e4 | 3314 | |
984947dc | 3315 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3316 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3317 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3318 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3319 | result = L2CAP_CR_PEND; |
3320 | status = L2CAP_CS_AUTHOR_PEND; | |
3321 | parent->sk_data_ready(parent, 0); | |
3322 | } else { | |
0e587be7 | 3323 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3324 | result = L2CAP_CR_SUCCESS; |
3325 | status = L2CAP_CS_NO_INFO; | |
3326 | } | |
79d554a6 | 3327 | } else { |
0e587be7 | 3328 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3329 | result = L2CAP_CR_PEND; |
3330 | status = L2CAP_CS_AUTHEN_PEND; | |
3331 | } | |
3332 | } else { | |
0e587be7 | 3333 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3334 | result = L2CAP_CR_PEND; |
3335 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3336 | } |
3337 | ||
1da177e4 | 3338 | response: |
aa2ac881 | 3339 | release_sock(parent); |
3df91ea2 | 3340 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3341 | |
3342 | sendresp: | |
aca3192c YH |
3343 | rsp.scid = cpu_to_le16(scid); |
3344 | rsp.dcid = cpu_to_le16(dcid); | |
3345 | rsp.result = cpu_to_le16(result); | |
3346 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3347 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3348 | |
3349 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3350 | struct l2cap_info_req info; | |
3351 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3352 | ||
3353 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3354 | conn->info_ident = l2cap_get_ident(conn); | |
3355 | ||
ba13ccd9 | 3356 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3357 | |
3358 | l2cap_send_cmd(conn, conn->info_ident, | |
3359 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3360 | } | |
3361 | ||
c1360a1c | 3362 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3363 | result == L2CAP_CR_SUCCESS) { |
3364 | u8 buf[128]; | |
c1360a1c | 3365 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3366 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3367 | l2cap_build_conf_req(chan, buf), buf); |
3368 | chan->num_conf_req++; | |
e9aeb2dd GP |
3369 | } |
3370 | ||
1da177e4 LT |
3371 | return 0; |
3372 | } | |
3373 | ||
3374 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3375 | { | |
3376 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3377 | u16 scid, dcid, result, status; | |
48454079 | 3378 | struct l2cap_chan *chan; |
1da177e4 | 3379 | u8 req[128]; |
3df91ea2 | 3380 | int err; |
1da177e4 LT |
3381 | |
3382 | scid = __le16_to_cpu(rsp->scid); | |
3383 | dcid = __le16_to_cpu(rsp->dcid); | |
3384 | result = __le16_to_cpu(rsp->result); | |
3385 | status = __le16_to_cpu(rsp->status); | |
3386 | ||
1b009c98 AE |
3387 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3388 | dcid, scid, result, status); | |
1da177e4 | 3389 | |
3df91ea2 AE |
3390 | mutex_lock(&conn->chan_lock); |
3391 | ||
1da177e4 | 3392 | if (scid) { |
3df91ea2 AE |
3393 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3394 | if (!chan) { | |
3395 | err = -EFAULT; | |
3396 | goto unlock; | |
3397 | } | |
1da177e4 | 3398 | } else { |
3df91ea2 AE |
3399 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3400 | if (!chan) { | |
3401 | err = -EFAULT; | |
3402 | goto unlock; | |
3403 | } | |
1da177e4 LT |
3404 | } |
3405 | ||
3df91ea2 AE |
3406 | err = 0; |
3407 | ||
6be36555 | 3408 | l2cap_chan_lock(chan); |
48454079 | 3409 | |
1da177e4 LT |
3410 | switch (result) { |
3411 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3412 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3413 | chan->ident = 0; |
fe4128e0 | 3414 | chan->dcid = dcid; |
c1360a1c | 3415 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3416 | |
c1360a1c | 3417 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3418 | break; |
3419 | ||
1da177e4 | 3420 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3421 | l2cap_build_conf_req(chan, req), req); |
3422 | chan->num_conf_req++; | |
1da177e4 LT |
3423 | break; |
3424 | ||
3425 | case L2CAP_CR_PEND: | |
c1360a1c | 3426 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3427 | break; |
3428 | ||
3429 | default: | |
48454079 | 3430 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3431 | break; |
3432 | } | |
3433 | ||
6be36555 | 3434 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3435 | |
3436 | unlock: | |
3437 | mutex_unlock(&conn->chan_lock); | |
3438 | ||
3439 | return err; | |
1da177e4 LT |
3440 | } |
3441 | ||
47d1ec61 | 3442 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3443 | { |
3444 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3445 | * sides request it. | |
3446 | */ | |
0c1bc5c6 | 3447 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3448 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3449 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3450 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3451 | } |
3452 | ||
88219a0f | 3453 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3454 | { |
3455 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3456 | u16 dcid, flags; | |
3457 | u8 rsp[64]; | |
48454079 | 3458 | struct l2cap_chan *chan; |
3c588192 | 3459 | int len, err = 0; |
1da177e4 LT |
3460 | |
3461 | dcid = __le16_to_cpu(req->dcid); | |
3462 | flags = __le16_to_cpu(req->flags); | |
3463 | ||
3464 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3465 | ||
baa7e1fa | 3466 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3467 | if (!chan) |
1da177e4 LT |
3468 | return -ENOENT; |
3469 | ||
033b1142 | 3470 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3471 | struct l2cap_cmd_rej_cid rej; |
3472 | ||
3473 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3474 | rej.scid = cpu_to_le16(chan->scid); | |
3475 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3476 | |
df6bd743 GP |
3477 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3478 | sizeof(rej), &rej); | |
354f60a9 | 3479 | goto unlock; |
df6bd743 | 3480 | } |
354f60a9 | 3481 | |
5dee9e7c | 3482 | /* Reject if config buffer is too small. */ |
88219a0f | 3483 | len = cmd_len - sizeof(*req); |
7ac28817 | 3484 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3485 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3486 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3487 | L2CAP_CONF_REJECT, flags), rsp); |
3488 | goto unlock; | |
3489 | } | |
3490 | ||
3491 | /* Store config. */ | |
73ffa904 GP |
3492 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3493 | chan->conf_len += len; | |
1da177e4 LT |
3494 | |
3495 | if (flags & 0x0001) { | |
3496 | /* Incomplete config. Send empty response. */ | |
3497 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3498 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 3499 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
3500 | goto unlock; |
3501 | } | |
3502 | ||
3503 | /* Complete config. */ | |
73ffa904 | 3504 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3505 | if (len < 0) { |
e92c8e70 | 3506 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3507 | goto unlock; |
f2fcfcd6 | 3508 | } |
1da177e4 | 3509 | |
5dee9e7c | 3510 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3511 | chan->num_conf_rsp++; |
5dee9e7c | 3512 | |
5dee9e7c | 3513 | /* Reset config buffer. */ |
73ffa904 | 3514 | chan->conf_len = 0; |
5dee9e7c | 3515 | |
c1360a1c | 3516 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3517 | goto unlock; |
3518 | ||
c1360a1c | 3519 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3520 | set_default_fcs(chan); |
fcc203c3 | 3521 | |
89bc500e | 3522 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 3523 | |
105bdf9e MM |
3524 | if (chan->mode == L2CAP_MODE_ERTM || |
3525 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3526 | err = l2cap_ertm_init(chan); |
3527 | ||
3528 | if (err < 0) | |
3529 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3530 | else | |
3531 | l2cap_chan_ready(chan); | |
0565c1c2 | 3532 | |
876d9484 MH |
3533 | goto unlock; |
3534 | } | |
3535 | ||
c1360a1c | 3536 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3537 | u8 buf[64]; |
1da177e4 | 3538 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3539 | l2cap_build_conf_req(chan, buf), buf); |
3540 | chan->num_conf_req++; | |
1da177e4 LT |
3541 | } |
3542 | ||
0e8b207e AE |
3543 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3544 | Conf Rsp PENDING in the code above */ | |
3545 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3546 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3547 | ||
3548 | /* check compatibility */ | |
3549 | ||
3550 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3551 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3552 | ||
3553 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3554 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
3555 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
3556 | } | |
3557 | ||
1da177e4 | 3558 | unlock: |
6be36555 | 3559 | l2cap_chan_unlock(chan); |
3c588192 | 3560 | return err; |
1da177e4 LT |
3561 | } |
3562 | ||
3563 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3564 | { | |
3565 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3566 | u16 scid, flags, result; | |
48454079 | 3567 | struct l2cap_chan *chan; |
61386cba | 3568 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3569 | int err = 0; |
1da177e4 LT |
3570 | |
3571 | scid = __le16_to_cpu(rsp->scid); | |
3572 | flags = __le16_to_cpu(rsp->flags); | |
3573 | result = __le16_to_cpu(rsp->result); | |
3574 | ||
61386cba AE |
3575 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3576 | result, len); | |
1da177e4 | 3577 | |
baa7e1fa | 3578 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3579 | if (!chan) |
1da177e4 LT |
3580 | return 0; |
3581 | ||
3582 | switch (result) { | |
3583 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3584 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3585 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3586 | break; |
3587 | ||
0e8b207e AE |
3588 | case L2CAP_CONF_PENDING: |
3589 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3590 | ||
3591 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3592 | char buf[64]; | |
3593 | ||
3594 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3595 | buf, &result); | |
3596 | if (len < 0) { | |
3597 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3598 | goto done; | |
3599 | } | |
3600 | ||
3601 | /* check compatibility */ | |
3602 | ||
3603 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3604 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3605 | ||
3606 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3607 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3608 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3609 | } | |
3610 | goto done; | |
3611 | ||
1da177e4 | 3612 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3613 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3614 | char req[64]; |
3615 | ||
c2c77ec8 | 3616 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3617 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3618 | goto done; |
3619 | } | |
3620 | ||
f2fcfcd6 GP |
3621 | /* throw out any old stored conf requests */ |
3622 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3623 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3624 | req, &result); | |
f2fcfcd6 | 3625 | if (len < 0) { |
e92c8e70 | 3626 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3627 | goto done; |
3628 | } | |
3629 | ||
3630 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3631 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3632 | chan->num_conf_req++; |
f2fcfcd6 GP |
3633 | if (result != L2CAP_CONF_SUCCESS) |
3634 | goto done; | |
3635 | break; | |
1da177e4 LT |
3636 | } |
3637 | ||
8e87d142 | 3638 | default: |
6be36555 | 3639 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3640 | |
ba13ccd9 | 3641 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3642 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3643 | goto done; |
3644 | } | |
3645 | ||
3646 | if (flags & 0x01) | |
3647 | goto done; | |
3648 | ||
c1360a1c | 3649 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3650 | |
c1360a1c | 3651 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3652 | set_default_fcs(chan); |
fcc203c3 | 3653 | |
89bc500e | 3654 | l2cap_state_change(chan, BT_CONNECTED); |
105bdf9e MM |
3655 | if (chan->mode == L2CAP_MODE_ERTM || |
3656 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3657 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3658 | |
3c588192 MM |
3659 | if (err < 0) |
3660 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3661 | else | |
3662 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3663 | } |
3664 | ||
3665 | done: | |
6be36555 | 3666 | l2cap_chan_unlock(chan); |
3c588192 | 3667 | return err; |
1da177e4 LT |
3668 | } |
3669 | ||
3670 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3671 | { | |
3672 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3673 | struct l2cap_disconn_rsp rsp; | |
3674 | u16 dcid, scid; | |
48454079 | 3675 | struct l2cap_chan *chan; |
1da177e4 LT |
3676 | struct sock *sk; |
3677 | ||
3678 | scid = __le16_to_cpu(req->scid); | |
3679 | dcid = __le16_to_cpu(req->dcid); | |
3680 | ||
3681 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3682 | ||
3df91ea2 AE |
3683 | mutex_lock(&conn->chan_lock); |
3684 | ||
3685 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3686 | if (!chan) { | |
3687 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3688 | return 0; |
3df91ea2 | 3689 | } |
1da177e4 | 3690 | |
6be36555 AE |
3691 | l2cap_chan_lock(chan); |
3692 | ||
48454079 GP |
3693 | sk = chan->sk; |
3694 | ||
fe4128e0 GP |
3695 | rsp.dcid = cpu_to_le16(chan->scid); |
3696 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3697 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3698 | ||
6be36555 | 3699 | lock_sock(sk); |
1da177e4 | 3700 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3701 | release_sock(sk); |
1da177e4 | 3702 | |
61d6ef3e | 3703 | l2cap_chan_hold(chan); |
48454079 | 3704 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3705 | |
3706 | l2cap_chan_unlock(chan); | |
1da177e4 | 3707 | |
ba3bd0ee | 3708 | chan->ops->close(chan->data); |
61d6ef3e | 3709 | l2cap_chan_put(chan); |
3df91ea2 AE |
3710 | |
3711 | mutex_unlock(&conn->chan_lock); | |
3712 | ||
1da177e4 LT |
3713 | return 0; |
3714 | } | |
3715 | ||
3716 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3717 | { | |
3718 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3719 | u16 dcid, scid; | |
48454079 | 3720 | struct l2cap_chan *chan; |
1da177e4 LT |
3721 | |
3722 | scid = __le16_to_cpu(rsp->scid); | |
3723 | dcid = __le16_to_cpu(rsp->dcid); | |
3724 | ||
3725 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3726 | ||
3df91ea2 AE |
3727 | mutex_lock(&conn->chan_lock); |
3728 | ||
3729 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3730 | if (!chan) { | |
3731 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3732 | return 0; |
3df91ea2 | 3733 | } |
1da177e4 | 3734 | |
6be36555 | 3735 | l2cap_chan_lock(chan); |
48454079 | 3736 | |
61d6ef3e | 3737 | l2cap_chan_hold(chan); |
48454079 | 3738 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3739 | |
3740 | l2cap_chan_unlock(chan); | |
1da177e4 | 3741 | |
ba3bd0ee | 3742 | chan->ops->close(chan->data); |
61d6ef3e | 3743 | l2cap_chan_put(chan); |
3df91ea2 AE |
3744 | |
3745 | mutex_unlock(&conn->chan_lock); | |
3746 | ||
1da177e4 LT |
3747 | return 0; |
3748 | } | |
3749 | ||
3750 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3751 | { | |
3752 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3753 | u16 type; |
3754 | ||
3755 | type = __le16_to_cpu(req->type); | |
3756 | ||
3757 | BT_DBG("type 0x%4.4x", type); | |
3758 | ||
f0709e03 MH |
3759 | if (type == L2CAP_IT_FEAT_MASK) { |
3760 | u8 buf[8]; | |
44dd46de | 3761 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3762 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3763 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3764 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3765 | if (!disable_ertm) |
fcc203c3 GP |
3766 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3767 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3768 | if (enable_hs) |
6327eb98 AE |
3769 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3770 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3771 | |
1b7bf4ed | 3772 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3773 | l2cap_send_cmd(conn, cmd->ident, |
3774 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3775 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3776 | u8 buf[12]; | |
3777 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3778 | |
3779 | if (enable_hs) | |
3780 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3781 | else | |
3782 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3783 | ||
e1027a7c MH |
3784 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3785 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3786 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3787 | l2cap_send_cmd(conn, cmd->ident, |
3788 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3789 | } else { |
3790 | struct l2cap_info_rsp rsp; | |
3791 | rsp.type = cpu_to_le16(type); | |
3792 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3793 | l2cap_send_cmd(conn, cmd->ident, | |
3794 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3795 | } | |
1da177e4 LT |
3796 | |
3797 | return 0; | |
3798 | } | |
3799 | ||
3800 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3801 | { | |
3802 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3803 | u16 type, result; | |
3804 | ||
3805 | type = __le16_to_cpu(rsp->type); | |
3806 | result = __le16_to_cpu(rsp->result); | |
3807 | ||
3808 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3809 | ||
e90165be AE |
3810 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3811 | if (cmd->ident != conn->info_ident || | |
3812 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3813 | return 0; | |
3814 | ||
17cd3f37 | 3815 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3816 | |
adb08ede VT |
3817 | if (result != L2CAP_IR_SUCCESS) { |
3818 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3819 | conn->info_ident = 0; | |
3820 | ||
3821 | l2cap_conn_start(conn); | |
3822 | ||
3823 | return 0; | |
3824 | } | |
3825 | ||
978c93b9 AE |
3826 | switch (type) { |
3827 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3828 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3829 | |
47ec1dcd | 3830 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3831 | struct l2cap_info_req req; |
3832 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3833 | ||
3834 | conn->info_ident = l2cap_get_ident(conn); | |
3835 | ||
3836 | l2cap_send_cmd(conn, conn->info_ident, | |
3837 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3838 | } else { | |
3839 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3840 | conn->info_ident = 0; | |
3841 | ||
3842 | l2cap_conn_start(conn); | |
3843 | } | |
978c93b9 AE |
3844 | break; |
3845 | ||
3846 | case L2CAP_IT_FIXED_CHAN: | |
3847 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3848 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3849 | conn->info_ident = 0; |
984947dc MH |
3850 | |
3851 | l2cap_conn_start(conn); | |
978c93b9 | 3852 | break; |
984947dc | 3853 | } |
4e8402a3 | 3854 | |
1da177e4 LT |
3855 | return 0; |
3856 | } | |
3857 | ||
f94ff6ff MM |
3858 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3859 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3860 | void *data) | |
3861 | { | |
3862 | struct l2cap_create_chan_req *req = data; | |
3863 | struct l2cap_create_chan_rsp rsp; | |
3864 | u16 psm, scid; | |
3865 | ||
3866 | if (cmd_len != sizeof(*req)) | |
3867 | return -EPROTO; | |
3868 | ||
3869 | if (!enable_hs) | |
3870 | return -EINVAL; | |
3871 | ||
3872 | psm = le16_to_cpu(req->psm); | |
3873 | scid = le16_to_cpu(req->scid); | |
3874 | ||
3875 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3876 | ||
3877 | /* Placeholder: Always reject */ | |
3878 | rsp.dcid = 0; | |
3879 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3880 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3881 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3882 | |
3883 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3884 | sizeof(rsp), &rsp); | |
3885 | ||
3886 | return 0; | |
3887 | } | |
3888 | ||
3889 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3890 | struct l2cap_cmd_hdr *cmd, void *data) | |
3891 | { | |
3892 | BT_DBG("conn %p", conn); | |
3893 | ||
3894 | return l2cap_connect_rsp(conn, cmd, data); | |
3895 | } | |
3896 | ||
8d5a04a1 MM |
3897 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3898 | u16 icid, u16 result) | |
3899 | { | |
3900 | struct l2cap_move_chan_rsp rsp; | |
3901 | ||
3902 | BT_DBG("icid %d, result %d", icid, result); | |
3903 | ||
3904 | rsp.icid = cpu_to_le16(icid); | |
3905 | rsp.result = cpu_to_le16(result); | |
3906 | ||
3907 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3908 | } | |
3909 | ||
3910 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3911 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3912 | { | |
3913 | struct l2cap_move_chan_cfm cfm; | |
3914 | u8 ident; | |
3915 | ||
3916 | BT_DBG("icid %d, result %d", icid, result); | |
3917 | ||
3918 | ident = l2cap_get_ident(conn); | |
3919 | if (chan) | |
3920 | chan->ident = ident; | |
3921 | ||
3922 | cfm.icid = cpu_to_le16(icid); | |
3923 | cfm.result = cpu_to_le16(result); | |
3924 | ||
3925 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3926 | } | |
3927 | ||
3928 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3929 | u16 icid) | |
3930 | { | |
3931 | struct l2cap_move_chan_cfm_rsp rsp; | |
3932 | ||
3933 | BT_DBG("icid %d", icid); | |
3934 | ||
3935 | rsp.icid = cpu_to_le16(icid); | |
3936 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3937 | } | |
3938 | ||
3939 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3940 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3941 | { | |
3942 | struct l2cap_move_chan_req *req = data; | |
3943 | u16 icid = 0; | |
3944 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3945 | ||
3946 | if (cmd_len != sizeof(*req)) | |
3947 | return -EPROTO; | |
3948 | ||
3949 | icid = le16_to_cpu(req->icid); | |
3950 | ||
3951 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3952 | ||
3953 | if (!enable_hs) | |
3954 | return -EINVAL; | |
3955 | ||
3956 | /* Placeholder: Always refuse */ | |
3957 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3958 | ||
3959 | return 0; | |
3960 | } | |
3961 | ||
3962 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3963 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3964 | { | |
3965 | struct l2cap_move_chan_rsp *rsp = data; | |
3966 | u16 icid, result; | |
3967 | ||
3968 | if (cmd_len != sizeof(*rsp)) | |
3969 | return -EPROTO; | |
3970 | ||
3971 | icid = le16_to_cpu(rsp->icid); | |
3972 | result = le16_to_cpu(rsp->result); | |
3973 | ||
3974 | BT_DBG("icid %d, result %d", icid, result); | |
3975 | ||
3976 | /* Placeholder: Always unconfirmed */ | |
3977 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3978 | ||
3979 | return 0; | |
3980 | } | |
3981 | ||
3982 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3983 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3984 | { | |
3985 | struct l2cap_move_chan_cfm *cfm = data; | |
3986 | u16 icid, result; | |
3987 | ||
3988 | if (cmd_len != sizeof(*cfm)) | |
3989 | return -EPROTO; | |
3990 | ||
3991 | icid = le16_to_cpu(cfm->icid); | |
3992 | result = le16_to_cpu(cfm->result); | |
3993 | ||
3994 | BT_DBG("icid %d, result %d", icid, result); | |
3995 | ||
3996 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3997 | ||
3998 | return 0; | |
3999 | } | |
4000 | ||
4001 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
4002 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
4003 | { | |
4004 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4005 | u16 icid; | |
4006 | ||
4007 | if (cmd_len != sizeof(*rsp)) | |
4008 | return -EPROTO; | |
4009 | ||
4010 | icid = le16_to_cpu(rsp->icid); | |
4011 | ||
4012 | BT_DBG("icid %d", icid); | |
4013 | ||
4014 | return 0; | |
4015 | } | |
4016 | ||
e2174ca4 | 4017 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4018 | u16 to_multiplier) |
4019 | { | |
4020 | u16 max_latency; | |
4021 | ||
4022 | if (min > max || min < 6 || max > 3200) | |
4023 | return -EINVAL; | |
4024 | ||
4025 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4026 | return -EINVAL; | |
4027 | ||
4028 | if (max >= to_multiplier * 8) | |
4029 | return -EINVAL; | |
4030 | ||
4031 | max_latency = (to_multiplier * 8 / max) - 1; | |
4032 | if (latency > 499 || latency > max_latency) | |
4033 | return -EINVAL; | |
4034 | ||
4035 | return 0; | |
4036 | } | |
4037 | ||
4038 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4039 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4040 | { | |
4041 | struct hci_conn *hcon = conn->hcon; | |
4042 | struct l2cap_conn_param_update_req *req; | |
4043 | struct l2cap_conn_param_update_rsp rsp; | |
4044 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4045 | int err; |
de73115a CT |
4046 | |
4047 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4048 | return -EINVAL; | |
4049 | ||
4050 | cmd_len = __le16_to_cpu(cmd->len); | |
4051 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4052 | return -EPROTO; | |
4053 | ||
4054 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4055 | min = __le16_to_cpu(req->min); |
4056 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4057 | latency = __le16_to_cpu(req->latency); |
4058 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4059 | ||
4060 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4061 | min, max, latency, to_multiplier); | |
4062 | ||
4063 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4064 | |
4065 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4066 | if (err) | |
de73115a CT |
4067 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
4068 | else | |
4069 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
4070 | ||
4071 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4072 | sizeof(rsp), &rsp); | |
4073 | ||
2ce603eb CT |
4074 | if (!err) |
4075 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4076 | ||
de73115a CT |
4077 | return 0; |
4078 | } | |
4079 | ||
3300d9a9 CT |
4080 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4081 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4082 | { | |
4083 | int err = 0; | |
4084 | ||
4085 | switch (cmd->code) { | |
4086 | case L2CAP_COMMAND_REJ: | |
4087 | l2cap_command_rej(conn, cmd, data); | |
4088 | break; | |
4089 | ||
4090 | case L2CAP_CONN_REQ: | |
4091 | err = l2cap_connect_req(conn, cmd, data); | |
4092 | break; | |
4093 | ||
4094 | case L2CAP_CONN_RSP: | |
4095 | err = l2cap_connect_rsp(conn, cmd, data); | |
4096 | break; | |
4097 | ||
4098 | case L2CAP_CONF_REQ: | |
4099 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4100 | break; | |
4101 | ||
4102 | case L2CAP_CONF_RSP: | |
4103 | err = l2cap_config_rsp(conn, cmd, data); | |
4104 | break; | |
4105 | ||
4106 | case L2CAP_DISCONN_REQ: | |
4107 | err = l2cap_disconnect_req(conn, cmd, data); | |
4108 | break; | |
4109 | ||
4110 | case L2CAP_DISCONN_RSP: | |
4111 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4112 | break; | |
4113 | ||
4114 | case L2CAP_ECHO_REQ: | |
4115 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4116 | break; | |
4117 | ||
4118 | case L2CAP_ECHO_RSP: | |
4119 | break; | |
4120 | ||
4121 | case L2CAP_INFO_REQ: | |
4122 | err = l2cap_information_req(conn, cmd, data); | |
4123 | break; | |
4124 | ||
4125 | case L2CAP_INFO_RSP: | |
4126 | err = l2cap_information_rsp(conn, cmd, data); | |
4127 | break; | |
4128 | ||
f94ff6ff MM |
4129 | case L2CAP_CREATE_CHAN_REQ: |
4130 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4131 | break; | |
4132 | ||
4133 | case L2CAP_CREATE_CHAN_RSP: | |
4134 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4135 | break; | |
4136 | ||
8d5a04a1 MM |
4137 | case L2CAP_MOVE_CHAN_REQ: |
4138 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4139 | break; | |
4140 | ||
4141 | case L2CAP_MOVE_CHAN_RSP: | |
4142 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4143 | break; | |
4144 | ||
4145 | case L2CAP_MOVE_CHAN_CFM: | |
4146 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4147 | break; | |
4148 | ||
4149 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4150 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4151 | break; | |
4152 | ||
3300d9a9 CT |
4153 | default: |
4154 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4155 | err = -EINVAL; | |
4156 | break; | |
4157 | } | |
4158 | ||
4159 | return err; | |
4160 | } | |
4161 | ||
4162 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4163 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4164 | { | |
4165 | switch (cmd->code) { | |
4166 | case L2CAP_COMMAND_REJ: | |
4167 | return 0; | |
4168 | ||
4169 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4170 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4171 | |
4172 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4173 | return 0; | |
4174 | ||
4175 | default: | |
4176 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4177 | return -EINVAL; | |
4178 | } | |
4179 | } | |
4180 | ||
4181 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4182 | struct sk_buff *skb) | |
1da177e4 LT |
4183 | { |
4184 | u8 *data = skb->data; | |
4185 | int len = skb->len; | |
4186 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4187 | int err; |
1da177e4 LT |
4188 | |
4189 | l2cap_raw_recv(conn, skb); | |
4190 | ||
4191 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4192 | u16 cmd_len; |
1da177e4 LT |
4193 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4194 | data += L2CAP_CMD_HDR_SIZE; | |
4195 | len -= L2CAP_CMD_HDR_SIZE; | |
4196 | ||
88219a0f | 4197 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4198 | |
88219a0f | 4199 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4200 | |
88219a0f | 4201 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4202 | BT_DBG("corrupted command"); |
4203 | break; | |
4204 | } | |
4205 | ||
3300d9a9 CT |
4206 | if (conn->hcon->type == LE_LINK) |
4207 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4208 | else | |
4209 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4210 | |
4211 | if (err) { | |
e2fd318e | 4212 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4213 | |
4214 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4215 | |
4216 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 4217 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4218 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4219 | } | |
4220 | ||
88219a0f AV |
4221 | data += cmd_len; |
4222 | len -= cmd_len; | |
1da177e4 LT |
4223 | } |
4224 | ||
4225 | kfree_skb(skb); | |
4226 | } | |
4227 | ||
47d1ec61 | 4228 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4229 | { |
4230 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4231 | int hdr_size; |
4232 | ||
4233 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4234 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4235 | else | |
4236 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4237 | |
47d1ec61 | 4238 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4239 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4240 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4241 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4242 | ||
4243 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4244 | return -EBADMSG; |
fcc203c3 GP |
4245 | } |
4246 | return 0; | |
4247 | } | |
4248 | ||
525cd185 | 4249 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4250 | { |
88843ab0 | 4251 | u32 control = 0; |
d5392c8f | 4252 | |
6a026610 | 4253 | chan->frames_sent = 0; |
d5392c8f | 4254 | |
0b209fae | 4255 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 4256 | |
e2ab4353 | 4257 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 4258 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 4259 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
4260 | } |
4261 | ||
e2ab4353 | 4262 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 4263 | l2cap_retransmit_frames(chan); |
d5392c8f | 4264 | |
525cd185 | 4265 | l2cap_ertm_send(chan); |
d5392c8f | 4266 | |
e2ab4353 | 4267 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 4268 | chan->frames_sent == 0) { |
ab784b73 | 4269 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
d5392c8f GP |
4270 | } |
4271 | } | |
4272 | ||
fb45de7d | 4273 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
4274 | { |
4275 | struct sk_buff *next_skb; | |
bfbacc11 | 4276 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f | 4277 | |
3ce3514f MM |
4278 | bt_cb(skb)->control.txseq = tx_seq; |
4279 | bt_cb(skb)->control.sar = sar; | |
8f17154f | 4280 | |
f1c6775b | 4281 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 4282 | |
836be934 | 4283 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 4284 | |
039d9572 | 4285 | while (next_skb) { |
3ce3514f | 4286 | if (bt_cb(next_skb)->control.txseq == tx_seq) |
9b53350d JPRV |
4287 | return -EINVAL; |
4288 | ||
836be934 | 4289 | next_tx_seq_offset = __seq_offset(chan, |
3ce3514f | 4290 | bt_cb(next_skb)->control.txseq, chan->buffer_seq); |
bfbacc11 JPRV |
4291 | |
4292 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 4293 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 4294 | return 0; |
8f17154f GP |
4295 | } |
4296 | ||
f1c6775b | 4297 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
4298 | next_skb = NULL; |
4299 | else | |
4300 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
4301 | } | |
8f17154f | 4302 | |
f1c6775b | 4303 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
4304 | |
4305 | return 0; | |
8f17154f GP |
4306 | } |
4307 | ||
84084a31 MM |
4308 | static void append_skb_frag(struct sk_buff *skb, |
4309 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4310 | { |
84084a31 MM |
4311 | /* skb->len reflects data in skb as well as all fragments |
4312 | * skb->data_len reflects only data in fragments | |
4313 | */ | |
4314 | if (!skb_has_frag_list(skb)) | |
4315 | skb_shinfo(skb)->frag_list = new_frag; | |
4316 | ||
4317 | new_frag->next = NULL; | |
4318 | ||
4319 | (*last_frag)->next = new_frag; | |
4320 | *last_frag = new_frag; | |
4321 | ||
4322 | skb->len += new_frag->len; | |
4323 | skb->data_len += new_frag->len; | |
4324 | skb->truesize += new_frag->truesize; | |
4325 | } | |
4326 | ||
88843ab0 | 4327 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
4328 | { |
4329 | int err = -EINVAL; | |
18778a63 | 4330 | |
7e0ef6ee AE |
4331 | switch (__get_ctrl_sar(chan, control)) { |
4332 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
4333 | if (chan->sdu) |
4334 | break; | |
18778a63 | 4335 | |
84084a31 MM |
4336 | err = chan->ops->recv(chan->data, skb); |
4337 | break; | |
18778a63 | 4338 | |
7e0ef6ee | 4339 | case L2CAP_SAR_START: |
84084a31 MM |
4340 | if (chan->sdu) |
4341 | break; | |
18778a63 | 4342 | |
6f61fd47 | 4343 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4344 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4345 | |
84084a31 MM |
4346 | if (chan->sdu_len > chan->imtu) { |
4347 | err = -EMSGSIZE; | |
4348 | break; | |
4349 | } | |
1890d36b | 4350 | |
84084a31 MM |
4351 | if (skb->len >= chan->sdu_len) |
4352 | break; | |
18778a63 | 4353 | |
84084a31 MM |
4354 | chan->sdu = skb; |
4355 | chan->sdu_last_frag = skb; | |
18778a63 | 4356 | |
84084a31 MM |
4357 | skb = NULL; |
4358 | err = 0; | |
18778a63 GP |
4359 | break; |
4360 | ||
7e0ef6ee | 4361 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4362 | if (!chan->sdu) |
84084a31 | 4363 | break; |
18778a63 | 4364 | |
84084a31 MM |
4365 | append_skb_frag(chan->sdu, skb, |
4366 | &chan->sdu_last_frag); | |
4367 | skb = NULL; | |
18778a63 | 4368 | |
84084a31 MM |
4369 | if (chan->sdu->len >= chan->sdu_len) |
4370 | break; | |
4178ba46 | 4371 | |
84084a31 | 4372 | err = 0; |
18778a63 GP |
4373 | break; |
4374 | ||
7e0ef6ee | 4375 | case L2CAP_SAR_END: |
6f61fd47 | 4376 | if (!chan->sdu) |
84084a31 | 4377 | break; |
18778a63 | 4378 | |
84084a31 MM |
4379 | append_skb_frag(chan->sdu, skb, |
4380 | &chan->sdu_last_frag); | |
4381 | skb = NULL; | |
4178ba46 | 4382 | |
84084a31 MM |
4383 | if (chan->sdu->len != chan->sdu_len) |
4384 | break; | |
18778a63 | 4385 | |
84084a31 | 4386 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4387 | |
84084a31 MM |
4388 | if (!err) { |
4389 | /* Reassembly complete */ | |
4390 | chan->sdu = NULL; | |
4391 | chan->sdu_last_frag = NULL; | |
4392 | chan->sdu_len = 0; | |
1890d36b | 4393 | } |
18778a63 GP |
4394 | break; |
4395 | } | |
4396 | ||
84084a31 MM |
4397 | if (err) { |
4398 | kfree_skb(skb); | |
4399 | kfree_skb(chan->sdu); | |
4400 | chan->sdu = NULL; | |
4401 | chan->sdu_last_frag = NULL; | |
4402 | chan->sdu_len = 0; | |
4403 | } | |
18778a63 | 4404 | |
84084a31 | 4405 | return err; |
18778a63 GP |
4406 | } |
4407 | ||
26f880d2 | 4408 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 4409 | { |
26f880d2 | 4410 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 4411 | |
26f880d2 | 4412 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3c588192 | 4413 | l2cap_seq_list_clear(&chan->srej_list); |
26f880d2 | 4414 | |
77f918bc | 4415 | __set_ack_timer(chan); |
26f880d2 MM |
4416 | } |
4417 | ||
4418 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
4419 | { | |
88843ab0 | 4420 | u32 control; |
712132eb | 4421 | |
e2ab4353 | 4422 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
4423 | goto done; |
4424 | ||
0b209fae | 4425 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 4426 | control |= __set_ctrl_poll(chan); |
ab784b73 | 4427 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
6a026610 | 4428 | chan->retry_count = 1; |
712132eb | 4429 | |
1a09bcb9 GP |
4430 | __clear_retrans_timer(chan); |
4431 | __set_monitor_timer(chan); | |
712132eb | 4432 | |
e2ab4353 | 4433 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
4434 | |
4435 | done: | |
e2ab4353 GP |
4436 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
4437 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 4438 | |
49208c9c | 4439 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
4440 | } |
4441 | ||
e328140f | 4442 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 4443 | { |
e328140f MM |
4444 | if (chan->mode == L2CAP_MODE_ERTM) { |
4445 | if (busy) | |
4446 | l2cap_ertm_enter_local_busy(chan); | |
4447 | else | |
4448 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 4449 | } |
1890d36b GP |
4450 | } |
4451 | ||
fb45de7d | 4452 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
4453 | { |
4454 | struct sk_buff *skb; | |
88843ab0 | 4455 | u32 control; |
8f17154f | 4456 | |
e328140f MM |
4457 | while ((skb = skb_peek(&chan->srej_q)) && |
4458 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4459 | int err; | |
4460 | ||
3ce3514f | 4461 | if (bt_cb(skb)->control.txseq != tx_seq) |
8f17154f GP |
4462 | break; |
4463 | ||
f1c6775b | 4464 | skb = skb_dequeue(&chan->srej_q); |
3ce3514f | 4465 | control = __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
84084a31 | 4466 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
4467 | |
4468 | if (err < 0) { | |
4469 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4470 | break; | |
4471 | } | |
4472 | ||
836be934 AE |
4473 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
4474 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
4475 | } |
4476 | } | |
4477 | ||
fb45de7d | 4478 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4479 | { |
8f17154f | 4480 | struct srej_list *l, *tmp; |
88843ab0 | 4481 | u32 control; |
8f17154f | 4482 | |
39d5a3ee | 4483 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
4484 | if (l->tx_seq == tx_seq) { |
4485 | list_del(&l->list); | |
4486 | kfree(l); | |
4487 | return; | |
4488 | } | |
ab784b73 | 4489 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4490 | control |= __set_reqseq(chan, l->tx_seq); |
8f17154f | 4491 | list_del(&l->list); |
39d5a3ee | 4492 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
4493 | } |
4494 | } | |
4495 | ||
aef89f21 | 4496 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4497 | { |
8f17154f | 4498 | struct srej_list *new; |
88843ab0 | 4499 | u32 control; |
8f17154f | 4500 | |
42e5c802 | 4501 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 4502 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4503 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
3c588192 | 4504 | l2cap_seq_list_append(&chan->srej_list, chan->expected_tx_seq); |
8f17154f GP |
4505 | |
4506 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
4507 | if (!new) |
4508 | return -ENOMEM; | |
4509 | ||
42e5c802 | 4510 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
4511 | |
4512 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
4513 | ||
39d5a3ee | 4514 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 4515 | } |
836be934 AE |
4516 | |
4517 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
4518 | |
4519 | return 0; | |
8f17154f GP |
4520 | } |
4521 | ||
88843ab0 | 4522 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 4523 | { |
fb45de7d | 4524 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 4525 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 4526 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 4527 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 4528 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
4529 | int err = 0; |
4530 | ||
88843ab0 | 4531 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 4532 | tx_seq, rx_control); |
1c2acffb | 4533 | |
03f6715d | 4534 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4535 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4536 | __clear_monitor_timer(chan); |
6a026610 | 4537 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4538 | __set_retrans_timer(chan); |
e2ab4353 | 4539 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
4540 | } |
4541 | ||
42e5c802 GP |
4542 | chan->expected_ack_seq = req_seq; |
4543 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 4544 | |
836be934 | 4545 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
4546 | |
4547 | /* invalid tx_seq */ | |
47d1ec61 | 4548 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 4549 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
4550 | goto drop; |
4551 | } | |
4552 | ||
77f918bc SJ |
4553 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
4554 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) | |
4555 | l2cap_send_ack(chan); | |
1890d36b | 4556 | goto drop; |
77f918bc | 4557 | } |
1890d36b | 4558 | |
02f1b641 MM |
4559 | if (tx_seq == chan->expected_tx_seq) |
4560 | goto expected; | |
4561 | ||
e2ab4353 | 4562 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 4563 | struct srej_list *first; |
30afb5b2 | 4564 | |
39d5a3ee | 4565 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
4566 | struct srej_list, list); |
4567 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 4568 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 4569 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
4570 | |
4571 | list_del(&first->list); | |
4572 | kfree(first); | |
4573 | ||
39d5a3ee | 4574 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 4575 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 4576 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 4577 | l2cap_send_ack(chan); |
49208c9c | 4578 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
4579 | } |
4580 | } else { | |
4581 | struct srej_list *l; | |
9b53350d JPRV |
4582 | |
4583 | /* duplicated tx_seq */ | |
42e5c802 | 4584 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 4585 | goto drop; |
8f17154f | 4586 | |
39d5a3ee | 4587 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 4588 | if (l->tx_seq == tx_seq) { |
525cd185 | 4589 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
4590 | return 0; |
4591 | } | |
4592 | } | |
aef89f21 SJ |
4593 | |
4594 | err = l2cap_send_srejframe(chan, tx_seq); | |
4595 | if (err < 0) { | |
4596 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4597 | return err; | |
4598 | } | |
30afb5b2 GP |
4599 | } |
4600 | } else { | |
836be934 AE |
4601 | expected_tx_seq_offset = __seq_offset(chan, |
4602 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
4603 | |
4604 | /* duplicated tx_seq */ | |
4605 | if (tx_seq_offset < expected_tx_seq_offset) | |
4606 | goto drop; | |
4607 | ||
e2ab4353 | 4608 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 4609 | |
49208c9c | 4610 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 4611 | |
39d5a3ee | 4612 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 4613 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 4614 | |
f1c6775b | 4615 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 4616 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 4617 | |
0ef3ef0f SJ |
4618 | /* Set P-bit only if there are some I-frames to ack. */ |
4619 | if (__clear_ack_timer(chan)) | |
4620 | set_bit(CONN_SEND_PBIT, &chan->conn_state); | |
ef54fd93 | 4621 | |
aef89f21 SJ |
4622 | err = l2cap_send_srejframe(chan, tx_seq); |
4623 | if (err < 0) { | |
4624 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4625 | return err; | |
4626 | } | |
1c2acffb | 4627 | } |
30afb5b2 GP |
4628 | return 0; |
4629 | ||
8f17154f | 4630 | expected: |
836be934 | 4631 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 4632 | |
e2ab4353 | 4633 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3ce3514f MM |
4634 | bt_cb(skb)->control.txseq = tx_seq; |
4635 | bt_cb(skb)->control.sar = sar; | |
f1c6775b | 4636 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
4637 | return 0; |
4638 | } | |
4639 | ||
84084a31 | 4640 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
4641 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
4642 | ||
e328140f MM |
4643 | if (err < 0) { |
4644 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4645 | return err; | |
4646 | } | |
2ece3684 | 4647 | |
03f6715d | 4648 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4649 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4650 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
4651 | } |
4652 | ||
c1b4f43b | 4653 | |
6a026610 GP |
4654 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
4655 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 4656 | l2cap_send_ack(chan); |
4d611e4d GP |
4657 | else |
4658 | __set_ack_timer(chan); | |
9e917af1 | 4659 | |
8f17154f | 4660 | return 0; |
9b53350d JPRV |
4661 | |
4662 | drop: | |
4663 | kfree_skb(skb); | |
4664 | return 0; | |
1c2acffb GP |
4665 | } |
4666 | ||
88843ab0 | 4667 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 4668 | { |
88843ab0 | 4669 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 4670 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 4671 | |
0b209fae | 4672 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 4673 | l2cap_drop_acked_frames(chan); |
1c2acffb | 4674 | |
e3781735 | 4675 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
4676 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
4677 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
4678 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 4679 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4680 | __set_retrans_timer(chan); |
05fbd89d | 4681 | |
e2ab4353 | 4682 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4683 | l2cap_send_srejtail(chan); |
05fbd89d | 4684 | } else { |
525cd185 | 4685 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4686 | } |
1d8f5d16 | 4687 | |
03f6715d | 4688 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4689 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4690 | |
e2ab4353 | 4691 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4692 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4693 | |
e072745f | 4694 | } else { |
e2ab4353 | 4695 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4696 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4697 | __set_retrans_timer(chan); |
1c2acffb | 4698 | |
e2ab4353 GP |
4699 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4700 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4701 | l2cap_send_ack(chan); |
894718a6 | 4702 | else |
525cd185 | 4703 | l2cap_ertm_send(chan); |
e072745f GP |
4704 | } |
4705 | } | |
2246b2f1 | 4706 | |
88843ab0 | 4707 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4708 | { |
0b209fae | 4709 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4710 | |
88843ab0 | 4711 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4712 | |
e2ab4353 | 4713 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4714 | |
42e5c802 GP |
4715 | chan->expected_ack_seq = tx_seq; |
4716 | l2cap_drop_acked_frames(chan); | |
e072745f | 4717 | |
03f6715d | 4718 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4719 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4720 | l2cap_retransmit_frames(chan); |
e072745f | 4721 | } else { |
525cd185 | 4722 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4723 | |
e2ab4353 GP |
4724 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4725 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4726 | } |
4727 | } | |
88843ab0 | 4728 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4729 | { |
0b209fae | 4730 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4731 | |
88843ab0 | 4732 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4733 | |
e2ab4353 | 4734 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4735 | |
e3781735 | 4736 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4737 | chan->expected_ack_seq = tx_seq; |
4738 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4739 | |
e2ab4353 | 4740 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4741 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4742 | |
525cd185 | 4743 | l2cap_ertm_send(chan); |
dfc909be | 4744 | |
e2ab4353 | 4745 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4746 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4747 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4748 | } |
03f6715d | 4749 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4750 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4751 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4752 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4753 | else |
525cd185 | 4754 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4755 | } else { |
525cd185 | 4756 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4757 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4758 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4759 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4760 | } |
e072745f GP |
4761 | } |
4762 | } | |
4763 | ||
88843ab0 | 4764 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4765 | { |
0b209fae | 4766 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4767 | |
88843ab0 | 4768 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4769 | |
e2ab4353 | 4770 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4771 | chan->expected_ack_seq = tx_seq; |
4772 | l2cap_drop_acked_frames(chan); | |
e072745f | 4773 | |
e3781735 | 4774 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4775 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4776 | |
e2ab4353 | 4777 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4778 | __clear_retrans_timer(chan); |
e3781735 | 4779 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4780 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4781 | return; |
e072745f | 4782 | } |
99b0d4b7 | 4783 | |
e3781735 | 4784 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4785 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4786 | } else { |
4787 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
ab784b73 | 4788 | } |
e072745f GP |
4789 | } |
4790 | ||
88843ab0 | 4791 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4792 | { |
88843ab0 | 4793 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4794 | |
03f6715d | 4795 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4796 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4797 | __clear_monitor_timer(chan); |
6a026610 | 4798 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4799 | __set_retrans_timer(chan); |
e2ab4353 | 4800 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4801 | } |
4802 | ||
ab784b73 AE |
4803 | switch (__get_ctrl_super(chan, rx_control)) { |
4804 | case L2CAP_SUPER_RR: | |
525cd185 | 4805 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4806 | break; |
4807 | ||
ab784b73 | 4808 | case L2CAP_SUPER_REJ: |
525cd185 | 4809 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4810 | break; |
2246b2f1 | 4811 | |
ab784b73 | 4812 | case L2CAP_SUPER_SREJ: |
525cd185 | 4813 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4814 | break; |
4815 | ||
ab784b73 | 4816 | case L2CAP_SUPER_RNR: |
525cd185 | 4817 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4818 | break; |
4819 | } | |
4820 | ||
faaebd19 | 4821 | kfree_skb(skb); |
1c2acffb GP |
4822 | return 0; |
4823 | } | |
4824 | ||
cec8ab6e MM |
4825 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4826 | struct sk_buff *skb, u8 event) | |
218bb9df | 4827 | { |
cec8ab6e MM |
4828 | /* Placeholder */ |
4829 | return -ENOTSUPP; | |
4830 | } | |
4831 | ||
4832 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
4833 | struct sk_buff *skb) | |
4834 | { | |
4835 | /* Placeholder */ | |
4836 | return -ENOTSUPP; | |
4837 | } | |
4838 | ||
4839 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
4840 | { | |
4841 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
4842 | u16 len; | |
4843 | u8 event; | |
218bb9df | 4844 | |
b76bbd66 MM |
4845 | __unpack_control(chan, skb); |
4846 | ||
218bb9df GP |
4847 | len = skb->len; |
4848 | ||
4849 | /* | |
4850 | * We can just drop the corrupted I-frame here. | |
4851 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 4852 | * procedures and ask for retransmission. |
218bb9df | 4853 | */ |
47d1ec61 | 4854 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4855 | goto drop; |
4856 | ||
cec8ab6e | 4857 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 4858 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4859 | |
47d1ec61 | 4860 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4861 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4862 | |
47d1ec61 | 4863 | if (len > chan->mps) { |
8c1d787b | 4864 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4865 | goto drop; |
4866 | } | |
4867 | ||
cec8ab6e MM |
4868 | if (!control->sframe) { |
4869 | int err; | |
218bb9df | 4870 | |
cec8ab6e MM |
4871 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
4872 | control->sar, control->reqseq, control->final, | |
4873 | control->txseq); | |
218bb9df | 4874 | |
cec8ab6e MM |
4875 | /* Validate F-bit - F=0 always valid, F=1 only |
4876 | * valid in TX WAIT_F | |
4877 | */ | |
4878 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 4879 | goto drop; |
cec8ab6e MM |
4880 | |
4881 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
4882 | event = L2CAP_EV_RECV_IFRAME; | |
4883 | err = l2cap_rx(chan, control, skb, event); | |
4884 | } else { | |
4885 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
4886 | } |
4887 | ||
cec8ab6e MM |
4888 | if (err) |
4889 | l2cap_send_disconn_req(chan->conn, chan, | |
4890 | ECONNRESET); | |
218bb9df | 4891 | } else { |
cec8ab6e MM |
4892 | const u8 rx_func_to_event[4] = { |
4893 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
4894 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
4895 | }; | |
4896 | ||
4897 | /* Only I-frames are expected in streaming mode */ | |
4898 | if (chan->mode == L2CAP_MODE_STREAMING) | |
4899 | goto drop; | |
4900 | ||
4901 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
4902 | control->reqseq, control->final, control->poll, | |
4903 | control->super); | |
4904 | ||
218bb9df GP |
4905 | if (len != 0) { |
4906 | BT_ERR("%d", len); | |
8c1d787b | 4907 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4908 | goto drop; |
4909 | } | |
4910 | ||
cec8ab6e MM |
4911 | /* Validate F and P bits */ |
4912 | if (control->final && (control->poll || | |
4913 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
4914 | goto drop; | |
4915 | ||
4916 | event = rx_func_to_event[control->super]; | |
4917 | if (l2cap_rx(chan, control, skb, event)) | |
4918 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
4919 | } |
4920 | ||
4921 | return 0; | |
4922 | ||
4923 | drop: | |
4924 | kfree_skb(skb); | |
4925 | return 0; | |
4926 | } | |
4927 | ||
1da177e4 LT |
4928 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4929 | { | |
48454079 | 4930 | struct l2cap_chan *chan; |
1da177e4 | 4931 | |
baa7e1fa | 4932 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4933 | if (!chan) { |
1da177e4 | 4934 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 4935 | /* Drop packet and return */ |
3379013b | 4936 | kfree_skb(skb); |
6be36555 | 4937 | return 0; |
1da177e4 LT |
4938 | } |
4939 | ||
49208c9c | 4940 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4941 | |
89bc500e | 4942 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4943 | goto drop; |
4944 | ||
0c1bc5c6 | 4945 | switch (chan->mode) { |
1c2acffb GP |
4946 | case L2CAP_MODE_BASIC: |
4947 | /* If socket recv buffers overflows we drop data here | |
4948 | * which is *bad* because L2CAP has to be reliable. | |
4949 | * But we don't have any other choice. L2CAP doesn't | |
4950 | * provide flow control mechanism. */ | |
1da177e4 | 4951 | |
0c1bc5c6 | 4952 | if (chan->imtu < skb->len) |
1c2acffb | 4953 | goto drop; |
1da177e4 | 4954 | |
23070494 | 4955 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4956 | goto done; |
4957 | break; | |
4958 | ||
4959 | case L2CAP_MODE_ERTM: | |
6840ed07 | 4960 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 4961 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
4962 | goto done; |
4963 | ||
1c2acffb | 4964 | default: |
0c1bc5c6 | 4965 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4966 | break; |
4967 | } | |
1da177e4 LT |
4968 | |
4969 | drop: | |
4970 | kfree_skb(skb); | |
4971 | ||
4972 | done: | |
6be36555 | 4973 | l2cap_chan_unlock(chan); |
0139418c | 4974 | |
1da177e4 LT |
4975 | return 0; |
4976 | } | |
4977 | ||
8e036fc3 | 4978 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4979 | { |
23691d75 | 4980 | struct l2cap_chan *chan; |
1da177e4 | 4981 | |
c2287681 | 4982 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 4983 | if (!chan) |
1da177e4 LT |
4984 | goto drop; |
4985 | ||
5b4cedaa | 4986 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4987 | |
89bc500e | 4988 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4989 | goto drop; |
4990 | ||
e13e21dc | 4991 | if (chan->imtu < skb->len) |
1da177e4 LT |
4992 | goto drop; |
4993 | ||
23070494 | 4994 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4995 | return 0; |
1da177e4 LT |
4996 | |
4997 | drop: | |
4998 | kfree_skb(skb); | |
4999 | ||
1da177e4 LT |
5000 | return 0; |
5001 | } | |
5002 | ||
d9b88702 AE |
5003 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5004 | struct sk_buff *skb) | |
9f69bda6 | 5005 | { |
23691d75 | 5006 | struct l2cap_chan *chan; |
9f69bda6 | 5007 | |
c2287681 | 5008 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5009 | if (!chan) |
9f69bda6 GP |
5010 | goto drop; |
5011 | ||
5b4cedaa | 5012 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5013 | |
89bc500e | 5014 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5015 | goto drop; |
5016 | ||
e13e21dc | 5017 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5018 | goto drop; |
5019 | ||
23070494 | 5020 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 5021 | return 0; |
9f69bda6 GP |
5022 | |
5023 | drop: | |
5024 | kfree_skb(skb); | |
5025 | ||
9f69bda6 GP |
5026 | return 0; |
5027 | } | |
5028 | ||
1da177e4 LT |
5029 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5030 | { | |
5031 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5032 | u16 cid, len; |
5033 | __le16 psm; | |
1da177e4 LT |
5034 | |
5035 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5036 | cid = __le16_to_cpu(lh->cid); | |
5037 | len = __le16_to_cpu(lh->len); | |
5038 | ||
1c2acffb GP |
5039 | if (len != skb->len) { |
5040 | kfree_skb(skb); | |
5041 | return; | |
5042 | } | |
5043 | ||
1da177e4 LT |
5044 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5045 | ||
5046 | switch (cid) { | |
3300d9a9 | 5047 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5048 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5049 | l2cap_sig_channel(conn, skb); |
5050 | break; | |
5051 | ||
8db4dc46 | 5052 | case L2CAP_CID_CONN_LESS: |
097db76c | 5053 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
5054 | skb_pull(skb, 2); |
5055 | l2cap_conless_channel(conn, psm, skb); | |
5056 | break; | |
5057 | ||
9f69bda6 GP |
5058 | case L2CAP_CID_LE_DATA: |
5059 | l2cap_att_channel(conn, cid, skb); | |
5060 | break; | |
5061 | ||
b501d6a1 AB |
5062 | case L2CAP_CID_SMP: |
5063 | if (smp_sig_channel(conn, skb)) | |
5064 | l2cap_conn_del(conn->hcon, EACCES); | |
5065 | break; | |
5066 | ||
1da177e4 LT |
5067 | default: |
5068 | l2cap_data_channel(conn, cid, skb); | |
5069 | break; | |
5070 | } | |
5071 | } | |
5072 | ||
5073 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5074 | ||
686ebf28 | 5075 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5076 | { |
5077 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5078 | struct l2cap_chan *c; |
1da177e4 | 5079 | |
1da177e4 LT |
5080 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5081 | ||
5082 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5083 | read_lock(&chan_list_lock); |
5084 | list_for_each_entry(c, &chan_list, global_l) { | |
5085 | struct sock *sk = c->sk; | |
4343478f | 5086 | |
89bc500e | 5087 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5088 | continue; |
5089 | ||
5090 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5091 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5092 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5093 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5094 | exact++; |
2af6b9d5 MH |
5095 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5096 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5097 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5098 | lm2 |= HCI_LM_MASTER; |
5099 | } | |
1da177e4 | 5100 | } |
23691d75 | 5101 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5102 | |
5103 | return exact ? lm1 : lm2; | |
5104 | } | |
5105 | ||
686ebf28 | 5106 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5107 | { |
0139418c MH |
5108 | struct l2cap_conn *conn; |
5109 | ||
1da177e4 LT |
5110 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5111 | ||
1da177e4 | 5112 | if (!status) { |
1da177e4 LT |
5113 | conn = l2cap_conn_add(hcon, status); |
5114 | if (conn) | |
5115 | l2cap_conn_ready(conn); | |
0139418c | 5116 | } else |
e175072f | 5117 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5118 | |
5119 | return 0; | |
5120 | } | |
5121 | ||
686ebf28 | 5122 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5123 | { |
5124 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5125 | ||
5126 | BT_DBG("hcon %p", hcon); | |
5127 | ||
686ebf28 | 5128 | if (!conn) |
9f5a0d7b | 5129 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5130 | return conn->disc_reason; |
5131 | } | |
5132 | ||
686ebf28 | 5133 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5134 | { |
5135 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5136 | ||
e175072f | 5137 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5138 | return 0; |
5139 | } | |
5140 | ||
4343478f | 5141 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5142 | { |
715ec005 | 5143 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5144 | return; |
5145 | ||
f62e4323 | 5146 | if (encrypt == 0x00) { |
4343478f | 5147 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5148 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5149 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5150 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5151 | } else { |
4343478f | 5152 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5153 | __clear_chan_timer(chan); |
f62e4323 MH |
5154 | } |
5155 | } | |
5156 | ||
686ebf28 | 5157 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5158 | { |
0139418c | 5159 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5160 | struct l2cap_chan *chan; |
1da177e4 | 5161 | |
0139418c | 5162 | if (!conn) |
1da177e4 | 5163 | return 0; |
0139418c | 5164 | |
1da177e4 LT |
5165 | BT_DBG("conn %p", conn); |
5166 | ||
160dc6ac | 5167 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5168 | if (!status && encrypt) |
5169 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5170 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5171 | } |
5172 | ||
3df91ea2 | 5173 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5174 | |
3df91ea2 | 5175 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5176 | l2cap_chan_lock(chan); |
1da177e4 | 5177 | |
f1cb9af5 VCG |
5178 | BT_DBG("chan->scid %d", chan->scid); |
5179 | ||
5180 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5181 | if (!status && encrypt) { | |
5182 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5183 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5184 | } |
5185 | ||
6be36555 | 5186 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5187 | continue; |
5188 | } | |
5189 | ||
c1360a1c | 5190 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5191 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5192 | continue; |
5193 | } | |
5194 | ||
89bc500e GP |
5195 | if (!status && (chan->state == BT_CONNECTED || |
5196 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5197 | struct sock *sk = chan->sk; |
5198 | ||
c5daa683 | 5199 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5200 | sk->sk_state_change(sk); |
5201 | ||
4343478f | 5202 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5203 | l2cap_chan_unlock(chan); |
9719f8af MH |
5204 | continue; |
5205 | } | |
5206 | ||
89bc500e | 5207 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5208 | if (!status) { |
9b27f350 | 5209 | l2cap_send_conn_req(chan); |
b1235d79 | 5210 | } else { |
ba13ccd9 | 5211 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5212 | } |
89bc500e | 5213 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5214 | struct sock *sk = chan->sk; |
b1235d79 | 5215 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5216 | __u16 res, stat; |
1da177e4 | 5217 | |
6be36555 AE |
5218 | lock_sock(sk); |
5219 | ||
b1235d79 | 5220 | if (!status) { |
c5daa683 GP |
5221 | if (test_bit(BT_SK_DEFER_SETUP, |
5222 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5223 | struct sock *parent = bt_sk(sk)->parent; |
5224 | res = L2CAP_CR_PEND; | |
5225 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5226 | if (parent) |
5227 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5228 | } else { |
0e587be7 | 5229 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5230 | res = L2CAP_CR_SUCCESS; |
5231 | stat = L2CAP_CS_NO_INFO; | |
5232 | } | |
b1235d79 | 5233 | } else { |
0e587be7 | 5234 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5235 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5236 | res = L2CAP_CR_SEC_BLOCK; |
5237 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5238 | } |
5239 | ||
6be36555 AE |
5240 | release_sock(sk); |
5241 | ||
fe4128e0 GP |
5242 | rsp.scid = cpu_to_le16(chan->dcid); |
5243 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5244 | rsp.result = cpu_to_le16(res); |
5245 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5246 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5247 | sizeof(rsp), &rsp); | |
b1235d79 | 5248 | } |
1da177e4 | 5249 | |
6be36555 | 5250 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5251 | } |
5252 | ||
3df91ea2 | 5253 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5254 | |
1da177e4 LT |
5255 | return 0; |
5256 | } | |
5257 | ||
686ebf28 | 5258 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5259 | { |
5260 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5261 | ||
5a08ecce AE |
5262 | if (!conn) |
5263 | conn = l2cap_conn_add(hcon, 0); | |
5264 | ||
5265 | if (!conn) | |
1da177e4 LT |
5266 | goto drop; |
5267 | ||
5268 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5269 | ||
e702112f | 5270 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5271 | struct l2cap_hdr *hdr; |
5272 | int len; | |
5273 | ||
5274 | if (conn->rx_len) { | |
5275 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5276 | kfree_skb(conn->rx_skb); | |
5277 | conn->rx_skb = NULL; | |
5278 | conn->rx_len = 0; | |
5279 | l2cap_conn_unreliable(conn, ECOMM); | |
5280 | } | |
5281 | ||
aae7fe22 AE |
5282 | /* Start fragment always begin with Basic L2CAP header */ |
5283 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5284 | BT_ERR("Frame is too short (len %d)", skb->len); |
5285 | l2cap_conn_unreliable(conn, ECOMM); | |
5286 | goto drop; | |
5287 | } | |
5288 | ||
5289 | hdr = (struct l2cap_hdr *) skb->data; | |
5290 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5291 | ||
5292 | if (len == skb->len) { | |
5293 | /* Complete frame received */ | |
5294 | l2cap_recv_frame(conn, skb); | |
5295 | return 0; | |
5296 | } | |
5297 | ||
5298 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5299 | ||
5300 | if (skb->len > len) { | |
5301 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5302 | skb->len, len); | |
5303 | l2cap_conn_unreliable(conn, ECOMM); | |
5304 | goto drop; | |
5305 | } | |
5306 | ||
5307 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5308 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5309 | if (!conn->rx_skb) | |
1da177e4 LT |
5310 | goto drop; |
5311 | ||
d626f62b | 5312 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5313 | skb->len); |
1da177e4 LT |
5314 | conn->rx_len = len - skb->len; |
5315 | } else { | |
5316 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5317 | ||
5318 | if (!conn->rx_len) { | |
5319 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5320 | l2cap_conn_unreliable(conn, ECOMM); | |
5321 | goto drop; | |
5322 | } | |
5323 | ||
5324 | if (skb->len > conn->rx_len) { | |
5325 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5326 | skb->len, conn->rx_len); | |
5327 | kfree_skb(conn->rx_skb); | |
5328 | conn->rx_skb = NULL; | |
5329 | conn->rx_len = 0; | |
5330 | l2cap_conn_unreliable(conn, ECOMM); | |
5331 | goto drop; | |
5332 | } | |
5333 | ||
d626f62b | 5334 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5335 | skb->len); |
1da177e4 LT |
5336 | conn->rx_len -= skb->len; |
5337 | ||
5338 | if (!conn->rx_len) { | |
5339 | /* Complete frame received */ | |
5340 | l2cap_recv_frame(conn, conn->rx_skb); | |
5341 | conn->rx_skb = NULL; | |
5342 | } | |
5343 | } | |
5344 | ||
5345 | drop: | |
5346 | kfree_skb(skb); | |
5347 | return 0; | |
5348 | } | |
5349 | ||
aef7d97c | 5350 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5351 | { |
23691d75 | 5352 | struct l2cap_chan *c; |
1da177e4 | 5353 | |
333055f2 | 5354 | read_lock(&chan_list_lock); |
1da177e4 | 5355 | |
23691d75 GP |
5356 | list_for_each_entry(c, &chan_list, global_l) { |
5357 | struct sock *sk = c->sk; | |
101545f6 | 5358 | |
903d343e | 5359 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5360 | batostr(&bt_sk(sk)->src), |
5361 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5362 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5363 | c->scid, c->dcid, c->imtu, c->omtu, |
5364 | c->sec_level, c->mode); | |
61e1b4b7 | 5365 | } |
1da177e4 | 5366 | |
333055f2 | 5367 | read_unlock(&chan_list_lock); |
1da177e4 | 5368 | |
aef7d97c | 5369 | return 0; |
1da177e4 LT |
5370 | } |
5371 | ||
aef7d97c MH |
5372 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5373 | { | |
5374 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5375 | } | |
5376 | ||
5377 | static const struct file_operations l2cap_debugfs_fops = { | |
5378 | .open = l2cap_debugfs_open, | |
5379 | .read = seq_read, | |
5380 | .llseek = seq_lseek, | |
5381 | .release = single_release, | |
5382 | }; | |
5383 | ||
5384 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5385 | |
64274518 | 5386 | int __init l2cap_init(void) |
1da177e4 LT |
5387 | { |
5388 | int err; | |
be9d1227 | 5389 | |
bb58f747 | 5390 | err = l2cap_init_sockets(); |
1da177e4 LT |
5391 | if (err < 0) |
5392 | return err; | |
5393 | ||
aef7d97c MH |
5394 | if (bt_debugfs) { |
5395 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5396 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5397 | if (!l2cap_debugfs) | |
5398 | BT_ERR("Failed to create L2CAP debug file"); | |
5399 | } | |
1da177e4 | 5400 | |
1da177e4 | 5401 | return 0; |
1da177e4 LT |
5402 | } |
5403 | ||
64274518 | 5404 | void l2cap_exit(void) |
1da177e4 | 5405 | { |
aef7d97c | 5406 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5407 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5408 | } |
5409 | ||
d1c4a17d GP |
5410 | module_param(disable_ertm, bool, 0644); |
5411 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |