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) { |
1a09bcb9 GP |
537 | __clear_retrans_timer(chan); |
538 | __clear_monitor_timer(chan); | |
539 | __clear_ack_timer(chan); | |
c13ffa62 | 540 | |
f1c6775b | 541 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 542 | |
3c588192 MM |
543 | l2cap_seq_list_free(&chan->srej_list); |
544 | l2cap_seq_list_free(&chan->retrans_list); | |
c13ffa62 | 545 | } |
0139418c MH |
546 | } |
547 | ||
4519de9a GP |
548 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
549 | { | |
550 | struct sock *sk; | |
551 | ||
552 | BT_DBG("parent %p", parent); | |
553 | ||
554 | /* Close not yet accepted channels */ | |
0f852724 | 555 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 556 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 557 | |
6be36555 | 558 | l2cap_chan_lock(chan); |
c9b66675 | 559 | __clear_chan_timer(chan); |
ba3bd0ee | 560 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 561 | l2cap_chan_unlock(chan); |
3df91ea2 | 562 | |
ba3bd0ee | 563 | chan->ops->close(chan->data); |
0f852724 | 564 | } |
4519de9a GP |
565 | } |
566 | ||
0f852724 | 567 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
568 | { |
569 | struct l2cap_conn *conn = chan->conn; | |
570 | struct sock *sk = chan->sk; | |
571 | ||
e05dcc32 AE |
572 | BT_DBG("chan %p state %s sk %p", chan, |
573 | state_to_string(chan->state), sk); | |
4519de9a | 574 | |
89bc500e | 575 | switch (chan->state) { |
4519de9a | 576 | case BT_LISTEN: |
6be36555 | 577 | lock_sock(sk); |
4519de9a | 578 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 579 | |
0e587be7 | 580 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 581 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 582 | release_sock(sk); |
4519de9a GP |
583 | break; |
584 | ||
585 | case BT_CONNECTED: | |
586 | case BT_CONFIG: | |
715ec005 | 587 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 588 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 589 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
590 | l2cap_send_disconn_req(conn, chan, reason); |
591 | } else | |
592 | l2cap_chan_del(chan, reason); | |
593 | break; | |
594 | ||
595 | case BT_CONNECT2: | |
715ec005 | 596 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
597 | conn->hcon->type == ACL_LINK) { |
598 | struct l2cap_conn_rsp rsp; | |
599 | __u16 result; | |
600 | ||
c5daa683 | 601 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
602 | result = L2CAP_CR_SEC_BLOCK; |
603 | else | |
604 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 605 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
606 | |
607 | rsp.scid = cpu_to_le16(chan->dcid); | |
608 | rsp.dcid = cpu_to_le16(chan->scid); | |
609 | rsp.result = cpu_to_le16(result); | |
610 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
611 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
612 | sizeof(rsp), &rsp); | |
613 | } | |
614 | ||
615 | l2cap_chan_del(chan, reason); | |
616 | break; | |
617 | ||
618 | case BT_CONNECT: | |
619 | case BT_DISCONN: | |
620 | l2cap_chan_del(chan, reason); | |
621 | break; | |
622 | ||
623 | default: | |
6be36555 | 624 | lock_sock(sk); |
4519de9a | 625 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 626 | release_sock(sk); |
4519de9a GP |
627 | break; |
628 | } | |
629 | } | |
630 | ||
4343478f | 631 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 632 | { |
715ec005 | 633 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 634 | switch (chan->sec_level) { |
8556edd3 JH |
635 | case BT_SECURITY_HIGH: |
636 | return HCI_AT_DEDICATED_BONDING_MITM; | |
637 | case BT_SECURITY_MEDIUM: | |
638 | return HCI_AT_DEDICATED_BONDING; | |
639 | default: | |
640 | return HCI_AT_NO_BONDING; | |
641 | } | |
fe4128e0 | 642 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
643 | if (chan->sec_level == BT_SECURITY_LOW) |
644 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 645 | |
4343478f | 646 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 647 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 648 | else |
8556edd3 | 649 | return HCI_AT_NO_BONDING; |
00ae4af9 | 650 | } else { |
4343478f | 651 | switch (chan->sec_level) { |
00ae4af9 | 652 | case BT_SECURITY_HIGH: |
8556edd3 | 653 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 654 | case BT_SECURITY_MEDIUM: |
8556edd3 | 655 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 656 | default: |
8556edd3 | 657 | return HCI_AT_NO_BONDING; |
00ae4af9 | 658 | } |
0684e5f9 | 659 | } |
8556edd3 JH |
660 | } |
661 | ||
662 | /* Service level security */ | |
d45fc423 | 663 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 664 | { |
8c1d787b | 665 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
666 | __u8 auth_type; |
667 | ||
4343478f | 668 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 669 | |
4343478f | 670 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
671 | } |
672 | ||
b5ad8b7f | 673 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
674 | { |
675 | u8 id; | |
676 | ||
677 | /* Get next available identificator. | |
678 | * 1 - 128 are used by kernel. | |
679 | * 129 - 199 are reserved. | |
680 | * 200 - 254 are used by utilities like l2ping, etc. | |
681 | */ | |
682 | ||
333055f2 | 683 | spin_lock(&conn->lock); |
4e8402a3 MH |
684 | |
685 | if (++conn->tx_ident > 128) | |
686 | conn->tx_ident = 1; | |
687 | ||
688 | id = conn->tx_ident; | |
689 | ||
333055f2 | 690 | spin_unlock(&conn->lock); |
4e8402a3 MH |
691 | |
692 | return id; | |
693 | } | |
694 | ||
4519de9a | 695 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
696 | { |
697 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 698 | u8 flags; |
4e8402a3 MH |
699 | |
700 | BT_DBG("code 0x%2.2x", code); | |
701 | ||
702 | if (!skb) | |
9a9c6a34 | 703 | return; |
4e8402a3 | 704 | |
e702112f AE |
705 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
706 | flags = ACL_START_NO_FLUSH; | |
707 | else | |
708 | flags = ACL_START; | |
709 | ||
14b12d0b | 710 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 711 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 712 | |
73d80deb LAD |
713 | hci_send_acl(conn->hchan, skb, flags); |
714 | } | |
715 | ||
716 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
717 | { | |
718 | struct hci_conn *hcon = chan->conn->hcon; | |
719 | u16 flags; | |
720 | ||
721 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
722 | skb->priority); | |
723 | ||
724 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
725 | lmp_no_flush_capable(hcon->hdev)) | |
726 | flags = ACL_START_NO_FLUSH; | |
727 | else | |
728 | flags = ACL_START; | |
14b12d0b | 729 | |
73d80deb LAD |
730 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
731 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
732 | } |
733 | ||
b76bbd66 MM |
734 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
735 | { | |
736 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
737 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
738 | ||
739 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
740 | /* S-Frame */ | |
741 | control->sframe = 1; | |
742 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
743 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
744 | ||
745 | control->sar = 0; | |
746 | control->txseq = 0; | |
747 | } else { | |
748 | /* I-Frame */ | |
749 | control->sframe = 0; | |
750 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
751 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
752 | ||
753 | control->poll = 0; | |
754 | control->super = 0; | |
755 | } | |
756 | } | |
757 | ||
b76bbd66 MM |
758 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
759 | { | |
760 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
761 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
762 | ||
763 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
764 | /* S-Frame */ | |
765 | control->sframe = 1; | |
766 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
767 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
768 | ||
769 | control->sar = 0; | |
770 | control->txseq = 0; | |
771 | } else { | |
772 | /* I-Frame */ | |
773 | control->sframe = 0; | |
774 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
775 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
776 | ||
777 | control->poll = 0; | |
778 | control->super = 0; | |
779 | } | |
780 | } | |
781 | ||
782 | static inline void __unpack_control(struct l2cap_chan *chan, | |
783 | struct sk_buff *skb) | |
784 | { | |
785 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
786 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
787 | &bt_cb(skb)->control); | |
cec8ab6e | 788 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
789 | } else { |
790 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
791 | &bt_cb(skb)->control); | |
cec8ab6e | 792 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
793 | } |
794 | } | |
795 | ||
b5c6aaed MM |
796 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
797 | { | |
798 | u32 packed; | |
799 | ||
800 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
801 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
802 | ||
803 | if (control->sframe) { | |
804 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
805 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
806 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
807 | } else { | |
808 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
809 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
810 | } | |
811 | ||
812 | return packed; | |
813 | } | |
814 | ||
815 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
816 | { | |
817 | u16 packed; | |
818 | ||
819 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
820 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
821 | ||
822 | if (control->sframe) { | |
823 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
824 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
825 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
826 | } else { | |
827 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
828 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
829 | } | |
830 | ||
831 | return packed; | |
832 | } | |
833 | ||
b76bbd66 MM |
834 | static inline void __pack_control(struct l2cap_chan *chan, |
835 | struct l2cap_ctrl *control, | |
836 | struct sk_buff *skb) | |
837 | { | |
838 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
839 | put_unaligned_le32(__pack_extended_control(control), | |
840 | skb->data + L2CAP_HDR_SIZE); | |
841 | } else { | |
842 | put_unaligned_le16(__pack_enhanced_control(control), | |
843 | skb->data + L2CAP_HDR_SIZE); | |
844 | } | |
845 | } | |
846 | ||
a67d7f6f MM |
847 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
848 | u32 control) | |
b5c6aaed MM |
849 | { |
850 | struct sk_buff *skb; | |
851 | struct l2cap_hdr *lh; | |
a67d7f6f | 852 | int hlen; |
b5c6aaed MM |
853 | |
854 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
855 | hlen = L2CAP_EXT_HDR_SIZE; | |
856 | else | |
857 | hlen = L2CAP_ENH_HDR_SIZE; | |
858 | ||
859 | if (chan->fcs == L2CAP_FCS_CRC16) | |
860 | hlen += L2CAP_FCS_SIZE; | |
861 | ||
a67d7f6f | 862 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 863 | |
b5c6aaed | 864 | if (!skb) |
a67d7f6f | 865 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
866 | |
867 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
868 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
869 | lh->cid = cpu_to_le16(chan->dcid); | |
870 | ||
a67d7f6f MM |
871 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
872 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
873 | else | |
874 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
875 | |
876 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 877 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
878 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
879 | } | |
880 | ||
881 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
882 | return skb; |
883 | } | |
884 | ||
885 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
886 | struct l2cap_ctrl *control) | |
887 | { | |
888 | struct sk_buff *skb; | |
889 | u32 control_field; | |
890 | ||
891 | BT_DBG("chan %p, control %p", chan, control); | |
892 | ||
893 | if (!control->sframe) | |
894 | return; | |
895 | ||
896 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
897 | !control->poll) | |
898 | control->final = 1; | |
899 | ||
900 | if (control->super == L2CAP_SUPER_RR) | |
901 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
902 | else if (control->super == L2CAP_SUPER_RNR) | |
903 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
904 | ||
905 | if (control->super != L2CAP_SUPER_SREJ) { | |
906 | chan->last_acked_seq = control->reqseq; | |
907 | __clear_ack_timer(chan); | |
908 | } | |
909 | ||
910 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
911 | control->final, control->poll, control->super); | |
912 | ||
913 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
914 | control_field = __pack_extended_control(control); | |
915 | else | |
916 | control_field = __pack_enhanced_control(control); | |
917 | ||
918 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
919 | if (!IS_ERR(skb)) | |
920 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
921 | } |
922 | ||
923 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) | |
924 | { | |
925 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
926 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); | |
927 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
928 | } else | |
929 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
930 | ||
931 | control |= __set_reqseq(chan, chan->buffer_seq); | |
b5c6aaed MM |
932 | } |
933 | ||
b4450035 | 934 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 935 | { |
c1360a1c | 936 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
937 | } |
938 | ||
9b27f350 AE |
939 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
940 | { | |
941 | struct l2cap_conn *conn = chan->conn; | |
942 | struct l2cap_conn_req req; | |
943 | ||
944 | req.scid = cpu_to_le16(chan->scid); | |
945 | req.psm = chan->psm; | |
946 | ||
947 | chan->ident = l2cap_get_ident(conn); | |
948 | ||
949 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
950 | ||
951 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
952 | } | |
953 | ||
9f0caeb1 VCG |
954 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
955 | { | |
956 | struct sock *sk = chan->sk; | |
957 | struct sock *parent; | |
958 | ||
959 | lock_sock(sk); | |
960 | ||
961 | parent = bt_sk(sk)->parent; | |
962 | ||
963 | BT_DBG("sk %p, parent %p", sk, parent); | |
964 | ||
2827011f | 965 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
966 | chan->conf_state = 0; |
967 | __clear_chan_timer(chan); | |
968 | ||
969 | __l2cap_state_change(chan, BT_CONNECTED); | |
970 | sk->sk_state_change(sk); | |
971 | ||
972 | if (parent) | |
973 | parent->sk_data_ready(parent, 0); | |
974 | ||
975 | release_sock(sk); | |
976 | } | |
977 | ||
fc7f8a7e | 978 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 979 | { |
8c1d787b | 980 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 981 | |
9f0caeb1 VCG |
982 | if (conn->hcon->type == LE_LINK) { |
983 | l2cap_chan_ready(chan); | |
984 | return; | |
985 | } | |
986 | ||
79d554a6 | 987 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
988 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
989 | return; | |
990 | ||
d45fc423 | 991 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
992 | __l2cap_no_conn_pending(chan)) |
993 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
994 | } else { |
995 | struct l2cap_info_req req; | |
996 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
997 | ||
998 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
999 | conn->info_ident = l2cap_get_ident(conn); | |
1000 | ||
ba13ccd9 | 1001 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
1002 | |
1003 | l2cap_send_cmd(conn, conn->info_ident, | |
1004 | L2CAP_INFO_REQ, sizeof(req), &req); | |
1005 | } | |
1006 | } | |
1007 | ||
cf6c2c0b GP |
1008 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1009 | { | |
1010 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1011 | if (!disable_ertm) |
cf6c2c0b GP |
1012 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1013 | ||
1014 | switch (mode) { | |
1015 | case L2CAP_MODE_ERTM: | |
1016 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1017 | case L2CAP_MODE_STREAMING: | |
1018 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1019 | default: | |
1020 | return 0x00; | |
1021 | } | |
1022 | } | |
1023 | ||
4519de9a | 1024 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1025 | { |
6be36555 | 1026 | struct sock *sk = chan->sk; |
22121fc9 GP |
1027 | struct l2cap_disconn_req req; |
1028 | ||
c13ffa62 GP |
1029 | if (!conn) |
1030 | return; | |
1031 | ||
0c1bc5c6 | 1032 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1033 | __clear_retrans_timer(chan); |
1034 | __clear_monitor_timer(chan); | |
1035 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1036 | } |
1037 | ||
fe4128e0 GP |
1038 | req.dcid = cpu_to_le16(chan->dcid); |
1039 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1040 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1041 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1042 | |
6be36555 | 1043 | lock_sock(sk); |
0e587be7 | 1044 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1045 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1046 | release_sock(sk); |
22121fc9 GP |
1047 | } |
1048 | ||
1da177e4 | 1049 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1050 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1051 | { | |
3df91ea2 | 1052 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1053 | |
1054 | BT_DBG("conn %p", conn); | |
1055 | ||
3df91ea2 | 1056 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1057 | |
3df91ea2 | 1058 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1059 | struct sock *sk = chan->sk; |
baa7e1fa | 1060 | |
6be36555 | 1061 | l2cap_chan_lock(chan); |
4e8402a3 | 1062 | |
715ec005 | 1063 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1064 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1065 | continue; |
1066 | } | |
1067 | ||
89bc500e | 1068 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1069 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1070 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1071 | l2cap_chan_unlock(chan); |
47731de7 GP |
1072 | continue; |
1073 | } | |
79d554a6 | 1074 | |
c1360a1c GP |
1075 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1076 | && test_bit(CONF_STATE2_DEVICE, | |
1077 | &chan->conf_state)) { | |
89bc500e | 1078 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1079 | l2cap_chan_unlock(chan); |
47731de7 | 1080 | continue; |
b1235d79 | 1081 | } |
47731de7 | 1082 | |
9b27f350 | 1083 | l2cap_send_conn_req(chan); |
47731de7 | 1084 | |
89bc500e | 1085 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1086 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1087 | char buf[128]; |
fe4128e0 GP |
1088 | rsp.scid = cpu_to_le16(chan->dcid); |
1089 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1090 | |
d45fc423 | 1091 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1092 | lock_sock(sk); |
c5daa683 GP |
1093 | if (test_bit(BT_SK_DEFER_SETUP, |
1094 | &bt_sk(sk)->flags)) { | |
f66dc81f MH |
1095 | struct sock *parent = bt_sk(sk)->parent; |
1096 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1097 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1098 | if (parent) |
1099 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1100 | |
1101 | } else { | |
0e587be7 | 1102 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
1103 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1104 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1105 | } | |
6be36555 | 1106 | release_sock(sk); |
79d554a6 MH |
1107 | } else { |
1108 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1109 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
1110 | } | |
1111 | ||
fc7f8a7e GP |
1112 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1113 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1114 | |
c1360a1c | 1115 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1116 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1117 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1118 | continue; |
1119 | } | |
1120 | ||
c1360a1c | 1121 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1122 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1123 | l2cap_build_conf_req(chan, buf), buf); |
1124 | chan->num_conf_req++; | |
4e8402a3 MH |
1125 | } |
1126 | ||
6be36555 | 1127 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1128 | } |
1129 | ||
3df91ea2 | 1130 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1131 | } |
1132 | ||
c2287681 | 1133 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1134 | * Returns closest match, locked. |
1135 | */ | |
d9b88702 | 1136 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1137 | bdaddr_t *src, |
1138 | bdaddr_t *dst) | |
b62f328b | 1139 | { |
23691d75 | 1140 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1141 | |
23691d75 | 1142 | read_lock(&chan_list_lock); |
b62f328b | 1143 | |
23691d75 GP |
1144 | list_for_each_entry(c, &chan_list, global_l) { |
1145 | struct sock *sk = c->sk; | |
fe4128e0 | 1146 | |
89bc500e | 1147 | if (state && c->state != state) |
b62f328b VT |
1148 | continue; |
1149 | ||
23691d75 | 1150 | if (c->scid == cid) { |
c2287681 IY |
1151 | int src_match, dst_match; |
1152 | int src_any, dst_any; | |
1153 | ||
b62f328b | 1154 | /* Exact match. */ |
c2287681 IY |
1155 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1156 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1157 | if (src_match && dst_match) { | |
23691d75 GP |
1158 | read_unlock(&chan_list_lock); |
1159 | return c; | |
1160 | } | |
b62f328b VT |
1161 | |
1162 | /* Closest match */ | |
c2287681 IY |
1163 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1164 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1165 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1166 | (src_any && dst_any)) | |
23691d75 | 1167 | c1 = c; |
b62f328b VT |
1168 | } |
1169 | } | |
280f294f | 1170 | |
23691d75 | 1171 | read_unlock(&chan_list_lock); |
b62f328b | 1172 | |
23691d75 | 1173 | return c1; |
b62f328b VT |
1174 | } |
1175 | ||
1176 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1177 | { | |
c916fbe4 | 1178 | struct sock *parent, *sk; |
23691d75 | 1179 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1180 | |
1181 | BT_DBG(""); | |
1182 | ||
1183 | /* Check if we have socket listening on cid */ | |
23691d75 | 1184 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1185 | conn->src, conn->dst); |
23691d75 | 1186 | if (!pchan) |
b62f328b VT |
1187 | return; |
1188 | ||
23691d75 GP |
1189 | parent = pchan->sk; |
1190 | ||
aa2ac881 | 1191 | lock_sock(parent); |
62f3a2cf | 1192 | |
b62f328b VT |
1193 | /* Check for backlog size */ |
1194 | if (sk_acceptq_is_full(parent)) { | |
1195 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1196 | goto clean; | |
1197 | } | |
1198 | ||
80808e43 GP |
1199 | chan = pchan->ops->new_connection(pchan->data); |
1200 | if (!chan) | |
b62f328b VT |
1201 | goto clean; |
1202 | ||
80808e43 | 1203 | sk = chan->sk; |
5d41ce1d | 1204 | |
b62f328b VT |
1205 | hci_conn_hold(conn->hcon); |
1206 | ||
b62f328b VT |
1207 | bacpy(&bt_sk(sk)->src, conn->src); |
1208 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1209 | ||
d1010240 GP |
1210 | bt_accept_enqueue(parent, sk); |
1211 | ||
3d57dc68 | 1212 | l2cap_chan_add(conn, chan); |
48454079 | 1213 | |
c9b66675 | 1214 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1215 | |
0e587be7 | 1216 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1217 | parent->sk_data_ready(parent, 0); |
1218 | ||
b62f328b | 1219 | clean: |
aa2ac881 | 1220 | release_sock(parent); |
b62f328b VT |
1221 | } |
1222 | ||
4e8402a3 MH |
1223 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1224 | { | |
48454079 | 1225 | struct l2cap_chan *chan; |
4e8402a3 | 1226 | |
79d554a6 | 1227 | BT_DBG("conn %p", conn); |
4e8402a3 | 1228 | |
b62f328b VT |
1229 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1230 | l2cap_le_conn_ready(conn); | |
1231 | ||
160dc6ac VCG |
1232 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1233 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1234 | ||
3df91ea2 | 1235 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1236 | |
3df91ea2 | 1237 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1238 | |
6be36555 | 1239 | l2cap_chan_lock(chan); |
4e8402a3 | 1240 | |
63128451 | 1241 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1242 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1243 | l2cap_chan_ready(chan); |
acd7d370 | 1244 | |
63128451 | 1245 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1246 | struct sock *sk = chan->sk; |
c9b66675 | 1247 | __clear_chan_timer(chan); |
6be36555 | 1248 | lock_sock(sk); |
0e587be7 | 1249 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1250 | sk->sk_state_change(sk); |
6be36555 | 1251 | release_sock(sk); |
b501d6a1 | 1252 | |
89bc500e | 1253 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1254 | l2cap_do_start(chan); |
4e8402a3 | 1255 | |
6be36555 | 1256 | l2cap_chan_unlock(chan); |
4e8402a3 | 1257 | } |
79d554a6 | 1258 | |
3df91ea2 | 1259 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1260 | } |
1261 | ||
1262 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1263 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1264 | { | |
48454079 | 1265 | struct l2cap_chan *chan; |
4e8402a3 MH |
1266 | |
1267 | BT_DBG("conn %p", conn); | |
1268 | ||
3df91ea2 | 1269 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1270 | |
3df91ea2 | 1271 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1272 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1273 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1274 | } |
1275 | ||
3df91ea2 | 1276 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1277 | } |
1278 | ||
f878fcad | 1279 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1280 | { |
f878fcad | 1281 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1282 | info_timer.work); |
4e8402a3 | 1283 | |
984947dc | 1284 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1285 | conn->info_ident = 0; |
984947dc | 1286 | |
4e8402a3 MH |
1287 | l2cap_conn_start(conn); |
1288 | } | |
1289 | ||
5d3de7df VCG |
1290 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1291 | { | |
1292 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1293 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1294 | |
1295 | if (!conn) | |
1296 | return; | |
1297 | ||
1298 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1299 | ||
1300 | kfree_skb(conn->rx_skb); | |
1301 | ||
3df91ea2 AE |
1302 | mutex_lock(&conn->chan_lock); |
1303 | ||
5d3de7df VCG |
1304 | /* Kill channels */ |
1305 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1306 | l2cap_chan_hold(chan); |
6be36555 AE |
1307 | l2cap_chan_lock(chan); |
1308 | ||
5d3de7df | 1309 | l2cap_chan_del(chan, err); |
6be36555 AE |
1310 | |
1311 | l2cap_chan_unlock(chan); | |
1312 | ||
5d3de7df | 1313 | chan->ops->close(chan->data); |
61d6ef3e | 1314 | l2cap_chan_put(chan); |
5d3de7df VCG |
1315 | } |
1316 | ||
3df91ea2 AE |
1317 | mutex_unlock(&conn->chan_lock); |
1318 | ||
73d80deb LAD |
1319 | hci_chan_del(conn->hchan); |
1320 | ||
5d3de7df | 1321 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1322 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1323 | |
51a8efd7 | 1324 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1325 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1326 | smp_chan_destroy(conn); |
d26a2345 | 1327 | } |
5d3de7df VCG |
1328 | |
1329 | hcon->l2cap_data = NULL; | |
1330 | kfree(conn); | |
1331 | } | |
1332 | ||
6c9d42a1 | 1333 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1334 | { |
6c9d42a1 GP |
1335 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1336 | security_timer.work); | |
5d3de7df VCG |
1337 | |
1338 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1339 | } | |
1340 | ||
1da177e4 LT |
1341 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1342 | { | |
0139418c | 1343 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1344 | struct hci_chan *hchan; |
1da177e4 | 1345 | |
0139418c | 1346 | if (conn || status) |
1da177e4 LT |
1347 | return conn; |
1348 | ||
73d80deb LAD |
1349 | hchan = hci_chan_create(hcon); |
1350 | if (!hchan) | |
1351 | return NULL; | |
1352 | ||
0139418c | 1353 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1354 | if (!conn) { |
1355 | hci_chan_del(hchan); | |
1da177e4 | 1356 | return NULL; |
73d80deb | 1357 | } |
1da177e4 LT |
1358 | |
1359 | hcon->l2cap_data = conn; | |
1360 | conn->hcon = hcon; | |
73d80deb | 1361 | conn->hchan = hchan; |
1da177e4 | 1362 | |
73d80deb | 1363 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1364 | |
acd7d370 VT |
1365 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1366 | conn->mtu = hcon->hdev->le_mtu; | |
1367 | else | |
1368 | conn->mtu = hcon->hdev->acl_mtu; | |
1369 | ||
1da177e4 LT |
1370 | conn->src = &hcon->hdev->bdaddr; |
1371 | conn->dst = &hcon->dst; | |
1372 | ||
4e8402a3 MH |
1373 | conn->feat_mask = 0; |
1374 | ||
1da177e4 | 1375 | spin_lock_init(&conn->lock); |
3df91ea2 | 1376 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1377 | |
1378 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1379 | |
5d3de7df | 1380 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1381 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1382 | else |
030013d8 | 1383 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1384 | |
9f5a0d7b | 1385 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1386 | |
1da177e4 LT |
1387 | return conn; |
1388 | } | |
1389 | ||
1da177e4 | 1390 | /* ---- Socket interface ---- */ |
1da177e4 | 1391 | |
c2287681 | 1392 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1393 | * Returns closest match. |
1394 | */ | |
c2287681 IY |
1395 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1396 | bdaddr_t *src, | |
1397 | bdaddr_t *dst) | |
1da177e4 | 1398 | { |
23691d75 | 1399 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1400 | |
23691d75 | 1401 | read_lock(&chan_list_lock); |
e0f0cb56 | 1402 | |
23691d75 GP |
1403 | list_for_each_entry(c, &chan_list, global_l) { |
1404 | struct sock *sk = c->sk; | |
fe4128e0 | 1405 | |
89bc500e | 1406 | if (state && c->state != state) |
1da177e4 LT |
1407 | continue; |
1408 | ||
23691d75 | 1409 | if (c->psm == psm) { |
c2287681 IY |
1410 | int src_match, dst_match; |
1411 | int src_any, dst_any; | |
1412 | ||
1da177e4 | 1413 | /* Exact match. */ |
c2287681 IY |
1414 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1415 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1416 | if (src_match && dst_match) { | |
a7567b20 | 1417 | read_unlock(&chan_list_lock); |
23691d75 GP |
1418 | return c; |
1419 | } | |
1da177e4 LT |
1420 | |
1421 | /* Closest match */ | |
c2287681 IY |
1422 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1423 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1424 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1425 | (src_any && dst_any)) | |
23691d75 | 1426 | c1 = c; |
1da177e4 LT |
1427 | } |
1428 | } | |
1da177e4 | 1429 | |
23691d75 | 1430 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1431 | |
23691d75 | 1432 | return c1; |
1da177e4 LT |
1433 | } |
1434 | ||
8e9f9892 AG |
1435 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1436 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1437 | { |
5d41ce1d | 1438 | struct sock *sk = chan->sk; |
1da177e4 | 1439 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1440 | struct l2cap_conn *conn; |
1441 | struct hci_conn *hcon; | |
1442 | struct hci_dev *hdev; | |
09ab6f4c | 1443 | __u8 auth_type; |
44d0e48e | 1444 | int err; |
1da177e4 | 1445 | |
8e9f9892 AG |
1446 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1447 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1448 | |
af05b30b GP |
1449 | hdev = hci_get_route(dst, src); |
1450 | if (!hdev) | |
1da177e4 LT |
1451 | return -EHOSTUNREACH; |
1452 | ||
09fd0de5 | 1453 | hci_dev_lock(hdev); |
1da177e4 | 1454 | |
6be36555 | 1455 | l2cap_chan_lock(chan); |
03a00194 GP |
1456 | |
1457 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1458 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1459 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1460 | err = -EINVAL; | |
1461 | goto done; | |
1462 | } | |
1463 | ||
1464 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1465 | err = -EINVAL; | |
1466 | goto done; | |
1467 | } | |
1468 | ||
1469 | switch (chan->mode) { | |
1470 | case L2CAP_MODE_BASIC: | |
1471 | break; | |
1472 | case L2CAP_MODE_ERTM: | |
1473 | case L2CAP_MODE_STREAMING: | |
1474 | if (!disable_ertm) | |
1475 | break; | |
1476 | /* fall through */ | |
1477 | default: | |
1478 | err = -ENOTSUPP; | |
1479 | goto done; | |
1480 | } | |
1481 | ||
6be36555 AE |
1482 | lock_sock(sk); |
1483 | ||
03a00194 GP |
1484 | switch (sk->sk_state) { |
1485 | case BT_CONNECT: | |
1486 | case BT_CONNECT2: | |
1487 | case BT_CONFIG: | |
1488 | /* Already connecting */ | |
1489 | err = 0; | |
6be36555 | 1490 | release_sock(sk); |
03a00194 GP |
1491 | goto done; |
1492 | ||
1493 | case BT_CONNECTED: | |
1494 | /* Already connected */ | |
1495 | err = -EISCONN; | |
6be36555 | 1496 | release_sock(sk); |
03a00194 GP |
1497 | goto done; |
1498 | ||
1499 | case BT_OPEN: | |
1500 | case BT_BOUND: | |
1501 | /* Can connect */ | |
1502 | break; | |
1503 | ||
1504 | default: | |
1505 | err = -EBADFD; | |
6be36555 | 1506 | release_sock(sk); |
03a00194 GP |
1507 | goto done; |
1508 | } | |
1509 | ||
1510 | /* Set destination address and psm */ | |
9219b2a0 | 1511 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1512 | |
1513 | release_sock(sk); | |
1514 | ||
03a00194 GP |
1515 | chan->psm = psm; |
1516 | chan->dcid = cid; | |
1da177e4 | 1517 | |
4343478f | 1518 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1519 | |
fe4128e0 | 1520 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1521 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1522 | chan->sec_level, auth_type); |
acd7d370 | 1523 | else |
8e9f9892 | 1524 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1525 | chan->sec_level, auth_type); |
acd7d370 | 1526 | |
30e76272 VT |
1527 | if (IS_ERR(hcon)) { |
1528 | err = PTR_ERR(hcon); | |
1da177e4 | 1529 | goto done; |
30e76272 | 1530 | } |
1da177e4 LT |
1531 | |
1532 | conn = l2cap_conn_add(hcon, 0); | |
1533 | if (!conn) { | |
1534 | hci_conn_put(hcon); | |
30e76272 | 1535 | err = -ENOMEM; |
1da177e4 LT |
1536 | goto done; |
1537 | } | |
1538 | ||
9f0caeb1 VCG |
1539 | if (hcon->type == LE_LINK) { |
1540 | err = 0; | |
1541 | ||
1542 | if (!list_empty(&conn->chan_l)) { | |
1543 | err = -EBUSY; | |
1544 | hci_conn_put(hcon); | |
1545 | } | |
1546 | ||
1547 | if (err) | |
1548 | goto done; | |
1549 | } | |
1550 | ||
1da177e4 LT |
1551 | /* Update source addr of the socket */ |
1552 | bacpy(src, conn->src); | |
1553 | ||
6be36555 | 1554 | l2cap_chan_unlock(chan); |
48454079 | 1555 | l2cap_chan_add(conn, chan); |
6be36555 | 1556 | l2cap_chan_lock(chan); |
48454079 | 1557 | |
6be36555 | 1558 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1559 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1560 | |
1561 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1562 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1563 | __clear_chan_timer(chan); |
d45fc423 | 1564 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1565 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1566 | } else |
fc7f8a7e | 1567 | l2cap_do_start(chan); |
1da177e4 LT |
1568 | } |
1569 | ||
30e76272 VT |
1570 | err = 0; |
1571 | ||
1da177e4 | 1572 | done: |
6be36555 | 1573 | l2cap_chan_unlock(chan); |
09fd0de5 | 1574 | hci_dev_unlock(hdev); |
1da177e4 LT |
1575 | hci_dev_put(hdev); |
1576 | return err; | |
1577 | } | |
1578 | ||
dcba0dba | 1579 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1580 | { |
8c1d787b | 1581 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1582 | DECLARE_WAITQUEUE(wait, current); |
1583 | int err = 0; | |
1584 | int timeo = HZ/5; | |
1585 | ||
2b0b05dd | 1586 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1587 | set_current_state(TASK_INTERRUPTIBLE); |
1588 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1589 | if (!timeo) |
1590 | timeo = HZ/5; | |
1591 | ||
1592 | if (signal_pending(current)) { | |
1593 | err = sock_intr_errno(timeo); | |
1594 | break; | |
1595 | } | |
1596 | ||
1597 | release_sock(sk); | |
1598 | timeo = schedule_timeout(timeo); | |
1599 | lock_sock(sk); | |
a71a0cf4 | 1600 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1601 | |
1602 | err = sock_error(sk); | |
1603 | if (err) | |
1604 | break; | |
1605 | } | |
1606 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1607 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1608 | return err; |
1609 | } | |
1610 | ||
721c4181 | 1611 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1612 | { |
721c4181 GP |
1613 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1614 | monitor_timer.work); | |
e90bac06 | 1615 | |
525cd185 | 1616 | BT_DBG("chan %p", chan); |
0e98958d | 1617 | |
6be36555 AE |
1618 | l2cap_chan_lock(chan); |
1619 | ||
2c03a7a4 | 1620 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1621 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1622 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1623 | l2cap_chan_put(chan); |
e90bac06 GP |
1624 | return; |
1625 | } | |
1626 | ||
6a026610 | 1627 | chan->retry_count++; |
1a09bcb9 | 1628 | __set_monitor_timer(chan); |
e90bac06 | 1629 | |
525cd185 | 1630 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1631 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1632 | l2cap_chan_put(chan); |
e90bac06 GP |
1633 | } |
1634 | ||
721c4181 | 1635 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1636 | { |
721c4181 GP |
1637 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1638 | retrans_timer.work); | |
e90bac06 | 1639 | |
49208c9c | 1640 | BT_DBG("chan %p", chan); |
0e98958d | 1641 | |
6be36555 AE |
1642 | l2cap_chan_lock(chan); |
1643 | ||
6a026610 | 1644 | chan->retry_count = 1; |
1a09bcb9 | 1645 | __set_monitor_timer(chan); |
e90bac06 | 1646 | |
e2ab4353 | 1647 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1648 | |
525cd185 | 1649 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1650 | |
1651 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1652 | l2cap_chan_put(chan); |
e90bac06 GP |
1653 | } |
1654 | ||
3733937d MM |
1655 | static int l2cap_streaming_send(struct l2cap_chan *chan, |
1656 | struct sk_buff_head *skbs) | |
6840ed07 | 1657 | { |
ccbb84af | 1658 | struct sk_buff *skb; |
3733937d | 1659 | struct l2cap_ctrl *control; |
6840ed07 | 1660 | |
3733937d MM |
1661 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1662 | ||
1663 | if (chan->state != BT_CONNECTED) | |
1664 | return -ENOTCONN; | |
1665 | ||
1666 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
1667 | ||
1668 | while (!skb_queue_empty(&chan->tx_q)) { | |
1669 | ||
1670 | skb = skb_dequeue(&chan->tx_q); | |
1671 | ||
1672 | bt_cb(skb)->control.retries = 1; | |
1673 | control = &bt_cb(skb)->control; | |
1674 | ||
1675 | control->reqseq = 0; | |
1676 | control->txseq = chan->next_tx_seq; | |
1677 | ||
1678 | __pack_control(chan, control, skb); | |
6840ed07 | 1679 | |
47d1ec61 | 1680 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1681 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1682 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1683 | } |
1684 | ||
4343478f | 1685 | l2cap_do_send(chan, skb); |
6840ed07 | 1686 | |
3733937d MM |
1687 | BT_DBG("Sent txseq %d", (int)control->txseq); |
1688 | ||
836be934 | 1689 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1690 | chan->frames_sent++; |
6840ed07 | 1691 | } |
3733937d MM |
1692 | |
1693 | return 0; | |
6840ed07 GP |
1694 | } |
1695 | ||
67c9e840 | 1696 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1697 | { |
1698 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1699 | struct l2cap_ctrl *control; |
1700 | int sent = 0; | |
1701 | ||
1702 | BT_DBG("chan %p", chan); | |
1c2acffb | 1703 | |
89bc500e | 1704 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1705 | return -ENOTCONN; |
e90bac06 | 1706 | |
94122bbe MM |
1707 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1708 | return 0; | |
1709 | ||
18a48e76 MM |
1710 | while (chan->tx_send_head && |
1711 | chan->unacked_frames < chan->remote_tx_win && | |
1712 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1713 | |
18a48e76 | 1714 | skb = chan->tx_send_head; |
e90bac06 | 1715 | |
18a48e76 MM |
1716 | bt_cb(skb)->control.retries = 1; |
1717 | control = &bt_cb(skb)->control; | |
95ffa978 | 1718 | |
e2ab4353 | 1719 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1720 | control->final = 1; |
e2ab4353 | 1721 | |
18a48e76 MM |
1722 | control->reqseq = chan->buffer_seq; |
1723 | chan->last_acked_seq = chan->buffer_seq; | |
1724 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1725 | |
18a48e76 | 1726 | __pack_control(chan, control, skb); |
e90bac06 | 1727 | |
47d1ec61 | 1728 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1729 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1730 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1731 | } |
1732 | ||
18a48e76 MM |
1733 | /* Clone after data has been modified. Data is assumed to be |
1734 | read-only (for locking purposes) on cloned sk_buffs. | |
1735 | */ | |
1736 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1737 | |
18a48e76 MM |
1738 | if (!tx_skb) |
1739 | break; | |
1c2acffb | 1740 | |
18a48e76 | 1741 | __set_retrans_timer(chan); |
836be934 AE |
1742 | |
1743 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1744 | chan->unacked_frames++; |
6a026610 | 1745 | chan->frames_sent++; |
18a48e76 | 1746 | sent++; |
1c2acffb | 1747 | |
58d35f87 GP |
1748 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1749 | chan->tx_send_head = NULL; | |
1c2acffb | 1750 | else |
58d35f87 | 1751 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1752 | |
1753 | l2cap_do_send(chan, tx_skb); | |
1754 | BT_DBG("Sent txseq %d", (int)control->txseq); | |
1c2acffb GP |
1755 | } |
1756 | ||
18a48e76 MM |
1757 | BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent, |
1758 | (int) chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
1759 | ||
1760 | return sent; | |
9e917af1 GP |
1761 | } |
1762 | ||
525cd185 | 1763 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1764 | { |
dfc909be GP |
1765 | int ret; |
1766 | ||
58d35f87 GP |
1767 | if (!skb_queue_empty(&chan->tx_q)) |
1768 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1769 | |
42e5c802 | 1770 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1771 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1772 | return ret; |
1773 | } | |
1774 | ||
0a0aba42 | 1775 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1776 | { |
0a0aba42 MM |
1777 | struct l2cap_ctrl control; |
1778 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1779 | chan->last_acked_seq); | |
1780 | int threshold; | |
9e917af1 | 1781 | |
0a0aba42 MM |
1782 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1783 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1784 | |
0a0aba42 MM |
1785 | memset(&control, 0, sizeof(control)); |
1786 | control.sframe = 1; | |
dfc909be | 1787 | |
0a0aba42 MM |
1788 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1789 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1790 | __clear_ack_timer(chan); | |
1791 | control.super = L2CAP_SUPER_RNR; | |
1792 | control.reqseq = chan->buffer_seq; | |
1793 | l2cap_send_sframe(chan, &control); | |
1794 | } else { | |
1795 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1796 | l2cap_ertm_send(chan); | |
1797 | /* If any i-frames were sent, they included an ack */ | |
1798 | if (chan->buffer_seq == chan->last_acked_seq) | |
1799 | frames_to_ack = 0; | |
1800 | } | |
dfc909be | 1801 | |
0a0aba42 MM |
1802 | /* Ack now if the tx window is 3/4ths full. |
1803 | * Calculate without mul or div | |
1804 | */ | |
1805 | threshold = chan->tx_win; | |
1806 | threshold += threshold << 1; | |
1807 | threshold >>= 2; | |
1808 | ||
1809 | BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack, | |
1810 | threshold); | |
1811 | ||
1812 | if (frames_to_ack >= threshold) { | |
1813 | __clear_ack_timer(chan); | |
1814 | control.super = L2CAP_SUPER_RR; | |
1815 | control.reqseq = chan->buffer_seq; | |
1816 | l2cap_send_sframe(chan, &control); | |
1817 | frames_to_ack = 0; | |
1818 | } | |
1c2acffb | 1819 | |
0a0aba42 MM |
1820 | if (frames_to_ack) |
1821 | __set_ack_timer(chan); | |
1822 | } | |
b17e73bb SJ |
1823 | } |
1824 | ||
04124681 GP |
1825 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1826 | struct msghdr *msg, int len, | |
1827 | int count, struct sk_buff *skb) | |
1c2acffb | 1828 | { |
0952a57a | 1829 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1830 | struct sk_buff **frag; |
90338947 | 1831 | int sent = 0; |
1da177e4 | 1832 | |
59203a21 | 1833 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1834 | return -EFAULT; |
1da177e4 LT |
1835 | |
1836 | sent += count; | |
1837 | len -= count; | |
1838 | ||
1839 | /* Continuation fragments (no L2CAP header) */ | |
1840 | frag = &skb_shinfo(skb)->frag_list; | |
1841 | while (len) { | |
fbe00700 GP |
1842 | struct sk_buff *tmp; |
1843 | ||
1da177e4 LT |
1844 | count = min_t(unsigned int, conn->mtu, len); |
1845 | ||
fbe00700 GP |
1846 | tmp = chan->ops->alloc_skb(chan, count, |
1847 | msg->msg_flags & MSG_DONTWAIT); | |
1848 | if (IS_ERR(tmp)) | |
1849 | return PTR_ERR(tmp); | |
1850 | ||
1851 | *frag = tmp; | |
2f7719ce | 1852 | |
1c2acffb GP |
1853 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1854 | return -EFAULT; | |
1da177e4 | 1855 | |
5e59b791 LAD |
1856 | (*frag)->priority = skb->priority; |
1857 | ||
1da177e4 LT |
1858 | sent += count; |
1859 | len -= count; | |
1860 | ||
2d0ed3d5 GP |
1861 | skb->len += (*frag)->len; |
1862 | skb->data_len += (*frag)->len; | |
1863 | ||
1da177e4 LT |
1864 | frag = &(*frag)->next; |
1865 | } | |
1da177e4 LT |
1866 | |
1867 | return sent; | |
1c2acffb | 1868 | } |
1da177e4 | 1869 | |
5e59b791 LAD |
1870 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1871 | struct msghdr *msg, size_t len, | |
1872 | u32 priority) | |
1c2acffb | 1873 | { |
8c1d787b | 1874 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1875 | struct sk_buff *skb; |
03a51213 | 1876 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1877 | struct l2cap_hdr *lh; |
1878 | ||
6d5922b0 | 1879 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1880 | |
1881 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1882 | |
1883 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1884 | msg->msg_flags & MSG_DONTWAIT); |
1885 | if (IS_ERR(skb)) | |
1886 | return skb; | |
1c2acffb | 1887 | |
5e59b791 LAD |
1888 | skb->priority = priority; |
1889 | ||
1c2acffb GP |
1890 | /* Create L2CAP header */ |
1891 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1892 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1893 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1894 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1895 | |
0952a57a | 1896 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1897 | if (unlikely(err < 0)) { |
1898 | kfree_skb(skb); | |
1899 | return ERR_PTR(err); | |
1900 | } | |
1901 | return skb; | |
1902 | } | |
1903 | ||
5e59b791 LAD |
1904 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1905 | struct msghdr *msg, size_t len, | |
1906 | u32 priority) | |
1c2acffb | 1907 | { |
8c1d787b | 1908 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1909 | struct sk_buff *skb; |
f2ba7fae | 1910 | int err, count; |
1c2acffb GP |
1911 | struct l2cap_hdr *lh; |
1912 | ||
6d5922b0 | 1913 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1914 | |
f2ba7fae | 1915 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1916 | |
f2ba7fae | 1917 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1918 | msg->msg_flags & MSG_DONTWAIT); |
1919 | if (IS_ERR(skb)) | |
1920 | return skb; | |
1c2acffb | 1921 | |
5e59b791 LAD |
1922 | skb->priority = priority; |
1923 | ||
1c2acffb GP |
1924 | /* Create L2CAP header */ |
1925 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1926 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1927 | lh->len = cpu_to_le16(len); |
1c2acffb | 1928 | |
0952a57a | 1929 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1930 | if (unlikely(err < 0)) { |
1931 | kfree_skb(skb); | |
1932 | return ERR_PTR(err); | |
1933 | } | |
1934 | return skb; | |
1935 | } | |
1936 | ||
ab0ff76d LAD |
1937 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1938 | struct msghdr *msg, size_t len, | |
94122bbe | 1939 | u16 sdulen) |
1c2acffb | 1940 | { |
8c1d787b | 1941 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1942 | struct sk_buff *skb; |
e4ca6d98 | 1943 | int err, count, hlen; |
1c2acffb GP |
1944 | struct l2cap_hdr *lh; |
1945 | ||
6d5922b0 | 1946 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1947 | |
0ee0d208 GP |
1948 | if (!conn) |
1949 | return ERR_PTR(-ENOTCONN); | |
1950 | ||
e4ca6d98 AE |
1951 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1952 | hlen = L2CAP_EXT_HDR_SIZE; | |
1953 | else | |
1954 | hlen = L2CAP_ENH_HDR_SIZE; | |
1955 | ||
c74e560c | 1956 | if (sdulen) |
03a51213 | 1957 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1958 | |
47d1ec61 | 1959 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1960 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1961 | |
1c2acffb | 1962 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
1963 | |
1964 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1965 | msg->msg_flags & MSG_DONTWAIT); |
1966 | if (IS_ERR(skb)) | |
1967 | return skb; | |
1c2acffb GP |
1968 | |
1969 | /* Create L2CAP header */ | |
1970 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1971 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1972 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 1973 | |
18a48e76 MM |
1974 | /* Control header is populated later */ |
1975 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1976 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
1977 | else | |
1978 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 1979 | |
c74e560c | 1980 | if (sdulen) |
03a51213 | 1981 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 1982 | |
0952a57a | 1983 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1984 | if (unlikely(err < 0)) { |
1985 | kfree_skb(skb); | |
1986 | return ERR_PTR(err); | |
1987 | } | |
e90bac06 | 1988 | |
18a48e76 | 1989 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 1990 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 1991 | return skb; |
1da177e4 LT |
1992 | } |
1993 | ||
94122bbe MM |
1994 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
1995 | struct sk_buff_head *seg_queue, | |
1996 | struct msghdr *msg, size_t len) | |
c74e560c | 1997 | { |
c74e560c | 1998 | struct sk_buff *skb; |
94122bbe MM |
1999 | u16 sdu_len; |
2000 | size_t pdu_len; | |
2001 | int err = 0; | |
2002 | u8 sar; | |
c74e560c | 2003 | |
94122bbe | 2004 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2005 | |
94122bbe MM |
2006 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2007 | * so fragmented skbs are not used. The HCI layer's handling | |
2008 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2009 | */ | |
c74e560c | 2010 | |
94122bbe MM |
2011 | /* PDU size is derived from the HCI MTU */ |
2012 | pdu_len = chan->conn->mtu; | |
c74e560c | 2013 | |
94122bbe MM |
2014 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2015 | ||
2016 | /* Adjust for largest possible L2CAP overhead. */ | |
2017 | pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE; | |
2018 | ||
2019 | /* Remote device may have requested smaller PDUs */ | |
2020 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2021 | ||
2022 | if (len <= pdu_len) { | |
2023 | sar = L2CAP_SAR_UNSEGMENTED; | |
2024 | sdu_len = 0; | |
2025 | pdu_len = len; | |
2026 | } else { | |
2027 | sar = L2CAP_SAR_START; | |
2028 | sdu_len = len; | |
2029 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2030 | } | |
2031 | ||
2032 | while (len > 0) { | |
2033 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2034 | |
c74e560c | 2035 | if (IS_ERR(skb)) { |
94122bbe | 2036 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2037 | return PTR_ERR(skb); |
2038 | } | |
2039 | ||
94122bbe MM |
2040 | bt_cb(skb)->control.sar = sar; |
2041 | __skb_queue_tail(seg_queue, skb); | |
2042 | ||
2043 | len -= pdu_len; | |
2044 | if (sdu_len) { | |
2045 | sdu_len = 0; | |
2046 | pdu_len += L2CAP_SDULEN_SIZE; | |
2047 | } | |
2048 | ||
2049 | if (len <= pdu_len) { | |
2050 | sar = L2CAP_SAR_END; | |
2051 | pdu_len = len; | |
2052 | } else { | |
2053 | sar = L2CAP_SAR_CONTINUE; | |
2054 | } | |
c74e560c | 2055 | } |
c74e560c | 2056 | |
94122bbe | 2057 | return err; |
c74e560c GP |
2058 | } |
2059 | ||
5e59b791 LAD |
2060 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2061 | u32 priority) | |
9a91a04a | 2062 | { |
9a91a04a | 2063 | struct sk_buff *skb; |
9a91a04a | 2064 | int err; |
94122bbe | 2065 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2066 | |
2067 | /* Connectionless channel */ | |
715ec005 | 2068 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2069 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2070 | if (IS_ERR(skb)) |
2071 | return PTR_ERR(skb); | |
2072 | ||
2073 | l2cap_do_send(chan, skb); | |
2074 | return len; | |
2075 | } | |
2076 | ||
2077 | switch (chan->mode) { | |
2078 | case L2CAP_MODE_BASIC: | |
2079 | /* Check outgoing MTU */ | |
2080 | if (len > chan->omtu) | |
2081 | return -EMSGSIZE; | |
2082 | ||
2083 | /* Create a basic PDU */ | |
5e59b791 | 2084 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2085 | if (IS_ERR(skb)) |
2086 | return PTR_ERR(skb); | |
2087 | ||
2088 | l2cap_do_send(chan, skb); | |
2089 | err = len; | |
2090 | break; | |
2091 | ||
2092 | case L2CAP_MODE_ERTM: | |
2093 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2094 | /* Check outgoing MTU */ |
2095 | if (len > chan->omtu) { | |
2096 | err = -EMSGSIZE; | |
2097 | break; | |
2098 | } | |
9a91a04a | 2099 | |
94122bbe | 2100 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2101 | |
94122bbe MM |
2102 | /* Do segmentation before calling in to the state machine, |
2103 | * since it's possible to block while waiting for memory | |
2104 | * allocation. | |
2105 | */ | |
2106 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2107 | |
94122bbe MM |
2108 | /* The channel could have been closed while segmenting, |
2109 | * check that it is still connected. | |
2110 | */ | |
2111 | if (chan->state != BT_CONNECTED) { | |
2112 | __skb_queue_purge(&seg_queue); | |
2113 | err = -ENOTCONN; | |
9a91a04a GP |
2114 | } |
2115 | ||
94122bbe | 2116 | if (err) |
9a91a04a | 2117 | break; |
9a91a04a | 2118 | |
3733937d | 2119 | if (chan->mode == L2CAP_MODE_ERTM) |
608bcc6d MM |
2120 | err = l2cap_tx(chan, 0, &seg_queue, |
2121 | L2CAP_EV_DATA_REQUEST); | |
3733937d MM |
2122 | else |
2123 | err = l2cap_streaming_send(chan, &seg_queue); | |
9a91a04a | 2124 | |
608bcc6d | 2125 | if (!err) |
9a91a04a GP |
2126 | err = len; |
2127 | ||
94122bbe MM |
2128 | /* If the skbs were not queued for sending, they'll still be in |
2129 | * seg_queue and need to be purged. | |
2130 | */ | |
2131 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2132 | break; |
2133 | ||
2134 | default: | |
2135 | BT_DBG("bad state %1.1x", chan->mode); | |
2136 | err = -EBADFD; | |
2137 | } | |
2138 | ||
2139 | return err; | |
2140 | } | |
2141 | ||
608bcc6d MM |
2142 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2143 | { | |
2144 | struct sk_buff *acked_skb; | |
2145 | u16 ackseq; | |
2146 | ||
2147 | BT_DBG("chan %p, reqseq %d", chan, reqseq); | |
2148 | ||
2149 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2150 | return; | |
2151 | ||
2152 | BT_DBG("expected_ack_seq %d, unacked_frames %d", | |
2153 | chan->expected_ack_seq, chan->unacked_frames); | |
2154 | ||
2155 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2156 | ackseq = __next_seq(chan, ackseq)) { | |
2157 | ||
2158 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2159 | if (acked_skb) { | |
2160 | skb_unlink(acked_skb, &chan->tx_q); | |
2161 | kfree_skb(acked_skb); | |
2162 | chan->unacked_frames--; | |
2163 | } | |
2164 | } | |
2165 | ||
2166 | chan->expected_ack_seq = reqseq; | |
2167 | ||
2168 | if (chan->unacked_frames == 0) | |
2169 | __clear_retrans_timer(chan); | |
2170 | ||
2171 | BT_DBG("unacked_frames %d", (int) chan->unacked_frames); | |
2172 | } | |
2173 | ||
2174 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2175 | { | |
2176 | BT_DBG("chan %p", chan); | |
2177 | ||
2178 | chan->expected_tx_seq = chan->buffer_seq; | |
2179 | l2cap_seq_list_clear(&chan->srej_list); | |
2180 | skb_queue_purge(&chan->srej_q); | |
2181 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2182 | } | |
2183 | ||
2184 | static int l2cap_tx_state_xmit(struct l2cap_chan *chan, | |
2185 | struct l2cap_ctrl *control, | |
2186 | struct sk_buff_head *skbs, u8 event) | |
2187 | { | |
2188 | int err = 0; | |
2189 | ||
2190 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2191 | event); | |
2192 | ||
2193 | switch (event) { | |
2194 | case L2CAP_EV_DATA_REQUEST: | |
2195 | if (chan->tx_send_head == NULL) | |
2196 | chan->tx_send_head = skb_peek(skbs); | |
2197 | ||
2198 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2199 | l2cap_ertm_send(chan); | |
2200 | break; | |
2201 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2202 | BT_DBG("Enter LOCAL_BUSY"); | |
2203 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2204 | ||
2205 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2206 | /* The SREJ_SENT state must be aborted if we are to | |
2207 | * enter the LOCAL_BUSY state. | |
2208 | */ | |
2209 | l2cap_abort_rx_srej_sent(chan); | |
2210 | } | |
2211 | ||
2212 | l2cap_send_ack(chan); | |
2213 | ||
2214 | break; | |
2215 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2216 | BT_DBG("Exit LOCAL_BUSY"); | |
2217 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2218 | ||
2219 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2220 | struct l2cap_ctrl local_control; | |
2221 | ||
2222 | memset(&local_control, 0, sizeof(local_control)); | |
2223 | local_control.sframe = 1; | |
2224 | local_control.super = L2CAP_SUPER_RR; | |
2225 | local_control.poll = 1; | |
2226 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2227 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2228 | |
2229 | chan->retry_count = 1; | |
2230 | __set_monitor_timer(chan); | |
2231 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2232 | } | |
2233 | break; | |
2234 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2235 | l2cap_process_reqseq(chan, control->reqseq); | |
2236 | break; | |
2237 | case L2CAP_EV_EXPLICIT_POLL: | |
2238 | l2cap_send_rr_or_rnr(chan, 1); | |
2239 | chan->retry_count = 1; | |
2240 | __set_monitor_timer(chan); | |
2241 | __clear_ack_timer(chan); | |
2242 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2243 | break; | |
2244 | case L2CAP_EV_RETRANS_TO: | |
2245 | l2cap_send_rr_or_rnr(chan, 1); | |
2246 | chan->retry_count = 1; | |
2247 | __set_monitor_timer(chan); | |
2248 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2249 | break; | |
2250 | case L2CAP_EV_RECV_FBIT: | |
2251 | /* Nothing to process */ | |
2252 | break; | |
2253 | default: | |
2254 | break; | |
2255 | } | |
2256 | ||
2257 | return err; | |
2258 | } | |
2259 | ||
2260 | static int l2cap_tx_state_wait_f(struct l2cap_chan *chan, | |
2261 | struct l2cap_ctrl *control, | |
2262 | struct sk_buff_head *skbs, u8 event) | |
2263 | { | |
2264 | int err = 0; | |
2265 | ||
2266 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, | |
2267 | event); | |
2268 | ||
2269 | switch (event) { | |
2270 | case L2CAP_EV_DATA_REQUEST: | |
2271 | if (chan->tx_send_head == NULL) | |
2272 | chan->tx_send_head = skb_peek(skbs); | |
2273 | /* Queue data, but don't send. */ | |
2274 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2275 | break; | |
2276 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2277 | BT_DBG("Enter LOCAL_BUSY"); | |
2278 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2279 | ||
2280 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2281 | /* The SREJ_SENT state must be aborted if we are to | |
2282 | * enter the LOCAL_BUSY state. | |
2283 | */ | |
2284 | l2cap_abort_rx_srej_sent(chan); | |
2285 | } | |
2286 | ||
2287 | l2cap_send_ack(chan); | |
2288 | ||
2289 | break; | |
2290 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2291 | BT_DBG("Exit LOCAL_BUSY"); | |
2292 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2293 | ||
2294 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2295 | struct l2cap_ctrl local_control; | |
2296 | memset(&local_control, 0, sizeof(local_control)); | |
2297 | local_control.sframe = 1; | |
2298 | local_control.super = L2CAP_SUPER_RR; | |
2299 | local_control.poll = 1; | |
2300 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2301 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2302 | |
2303 | chan->retry_count = 1; | |
2304 | __set_monitor_timer(chan); | |
2305 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2306 | } | |
2307 | break; | |
2308 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2309 | l2cap_process_reqseq(chan, control->reqseq); | |
2310 | ||
2311 | /* Fall through */ | |
2312 | ||
2313 | case L2CAP_EV_RECV_FBIT: | |
2314 | if (control && control->final) { | |
2315 | __clear_monitor_timer(chan); | |
2316 | if (chan->unacked_frames > 0) | |
2317 | __set_retrans_timer(chan); | |
2318 | chan->retry_count = 0; | |
2319 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2320 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2321 | } | |
2322 | break; | |
2323 | case L2CAP_EV_EXPLICIT_POLL: | |
2324 | /* Ignore */ | |
2325 | break; | |
2326 | case L2CAP_EV_MONITOR_TO: | |
2327 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2328 | l2cap_send_rr_or_rnr(chan, 1); | |
2329 | __set_monitor_timer(chan); | |
2330 | chan->retry_count++; | |
2331 | } else { | |
2332 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2333 | } | |
2334 | break; | |
2335 | default: | |
2336 | break; | |
2337 | } | |
2338 | ||
2339 | return err; | |
2340 | } | |
2341 | ||
2342 | static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
2343 | struct sk_buff_head *skbs, u8 event) | |
2344 | { | |
2345 | int err = 0; | |
2346 | ||
2347 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", | |
2348 | chan, control, skbs, event, chan->tx_state); | |
2349 | ||
2350 | switch (chan->tx_state) { | |
2351 | case L2CAP_TX_STATE_XMIT: | |
2352 | err = l2cap_tx_state_xmit(chan, control, skbs, event); | |
2353 | break; | |
2354 | case L2CAP_TX_STATE_WAIT_F: | |
2355 | err = l2cap_tx_state_wait_f(chan, control, skbs, event); | |
2356 | break; | |
2357 | default: | |
2358 | /* Ignore event */ | |
2359 | break; | |
2360 | } | |
2361 | ||
2362 | return err; | |
2363 | } | |
2364 | ||
4b51dae9 MM |
2365 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2366 | struct l2cap_ctrl *control) | |
2367 | { | |
2368 | BT_DBG("chan %p, control %p", chan, control); | |
2369 | l2cap_tx(chan, control, 0, L2CAP_EV_RECV_REQSEQ_AND_FBIT); | |
2370 | } | |
2371 | ||
1da177e4 LT |
2372 | /* Copy frame to all raw sockets on that connection */ |
2373 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2374 | { | |
1da177e4 | 2375 | struct sk_buff *nskb; |
48454079 | 2376 | struct l2cap_chan *chan; |
1da177e4 LT |
2377 | |
2378 | BT_DBG("conn %p", conn); | |
2379 | ||
3df91ea2 | 2380 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2381 | |
3df91ea2 | 2382 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2383 | struct sock *sk = chan->sk; |
715ec005 | 2384 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2385 | continue; |
2386 | ||
2387 | /* Don't send frame to the socket it came from */ | |
2388 | if (skb->sk == sk) | |
2389 | continue; | |
af05b30b GP |
2390 | nskb = skb_clone(skb, GFP_ATOMIC); |
2391 | if (!nskb) | |
1da177e4 LT |
2392 | continue; |
2393 | ||
23070494 | 2394 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2395 | kfree_skb(nskb); |
2396 | } | |
3d57dc68 | 2397 | |
3df91ea2 | 2398 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2399 | } |
2400 | ||
2401 | /* ---- L2CAP signalling commands ---- */ | |
2402 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2403 | u8 code, u8 ident, u16 dlen, void *data) | |
2404 | { | |
2405 | struct sk_buff *skb, **frag; | |
2406 | struct l2cap_cmd_hdr *cmd; | |
2407 | struct l2cap_hdr *lh; | |
2408 | int len, count; | |
2409 | ||
af05b30b GP |
2410 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2411 | conn, code, ident, dlen); | |
1da177e4 LT |
2412 | |
2413 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2414 | count = min_t(unsigned int, conn->mtu, len); | |
2415 | ||
2416 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2417 | if (!skb) | |
2418 | return NULL; | |
2419 | ||
2420 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2421 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2422 | |
2423 | if (conn->hcon->type == LE_LINK) | |
2424 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
2425 | else | |
2426 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
2427 | |
2428 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2429 | cmd->code = code; | |
2430 | cmd->ident = ident; | |
aca3192c | 2431 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2432 | |
2433 | if (dlen) { | |
2434 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2435 | memcpy(skb_put(skb, count), data, count); | |
2436 | data += count; | |
2437 | } | |
2438 | ||
2439 | len -= skb->len; | |
2440 | ||
2441 | /* Continuation fragments (no L2CAP header) */ | |
2442 | frag = &skb_shinfo(skb)->frag_list; | |
2443 | while (len) { | |
2444 | count = min_t(unsigned int, conn->mtu, len); | |
2445 | ||
2446 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2447 | if (!*frag) | |
2448 | goto fail; | |
2449 | ||
2450 | memcpy(skb_put(*frag, count), data, count); | |
2451 | ||
2452 | len -= count; | |
2453 | data += count; | |
2454 | ||
2455 | frag = &(*frag)->next; | |
2456 | } | |
2457 | ||
2458 | return skb; | |
2459 | ||
2460 | fail: | |
2461 | kfree_skb(skb); | |
2462 | return NULL; | |
2463 | } | |
2464 | ||
2465 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2466 | { | |
2467 | struct l2cap_conf_opt *opt = *ptr; | |
2468 | int len; | |
2469 | ||
2470 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2471 | *ptr += len; | |
2472 | ||
2473 | *type = opt->type; | |
2474 | *olen = opt->len; | |
2475 | ||
2476 | switch (opt->len) { | |
2477 | case 1: | |
2478 | *val = *((u8 *) opt->val); | |
2479 | break; | |
2480 | ||
2481 | case 2: | |
bfaaeb3e | 2482 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2483 | break; |
2484 | ||
2485 | case 4: | |
bfaaeb3e | 2486 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2487 | break; |
2488 | ||
2489 | default: | |
2490 | *val = (unsigned long) opt->val; | |
2491 | break; | |
2492 | } | |
2493 | ||
2494 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2495 | return len; | |
2496 | } | |
2497 | ||
1da177e4 LT |
2498 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2499 | { | |
2500 | struct l2cap_conf_opt *opt = *ptr; | |
2501 | ||
2502 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2503 | ||
2504 | opt->type = type; | |
2505 | opt->len = len; | |
2506 | ||
2507 | switch (len) { | |
2508 | case 1: | |
2509 | *((u8 *) opt->val) = val; | |
2510 | break; | |
2511 | ||
2512 | case 2: | |
4f8b691c | 2513 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2514 | break; |
2515 | ||
2516 | case 4: | |
4f8b691c | 2517 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2518 | break; |
2519 | ||
2520 | default: | |
2521 | memcpy(opt->val, (void *) val, len); | |
2522 | break; | |
2523 | } | |
2524 | ||
2525 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2526 | } | |
2527 | ||
f89cef09 AE |
2528 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2529 | { | |
2530 | struct l2cap_conf_efs efs; | |
2531 | ||
1ec918ce | 2532 | switch (chan->mode) { |
f89cef09 AE |
2533 | case L2CAP_MODE_ERTM: |
2534 | efs.id = chan->local_id; | |
2535 | efs.stype = chan->local_stype; | |
2536 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2537 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2538 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2539 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2540 | break; | |
2541 | ||
2542 | case L2CAP_MODE_STREAMING: | |
2543 | efs.id = 1; | |
2544 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2545 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2546 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2547 | efs.acc_lat = 0; | |
2548 | efs.flush_to = 0; | |
2549 | break; | |
2550 | ||
2551 | default: | |
2552 | return; | |
2553 | } | |
2554 | ||
2555 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2556 | (unsigned long) &efs); | |
2557 | } | |
2558 | ||
721c4181 | 2559 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2560 | { |
721c4181 GP |
2561 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2562 | ack_timer.work); | |
c1b4f43b | 2563 | |
2fb9b3d4 GP |
2564 | BT_DBG("chan %p", chan); |
2565 | ||
6be36555 AE |
2566 | l2cap_chan_lock(chan); |
2567 | ||
0a0aba42 | 2568 | l2cap_send_ack(chan); |
6be36555 AE |
2569 | |
2570 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2571 | |
2572 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2573 | } |
2574 | ||
3c588192 | 2575 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2576 | { |
3c588192 MM |
2577 | int err; |
2578 | ||
105bdf9e MM |
2579 | chan->next_tx_seq = 0; |
2580 | chan->expected_tx_seq = 0; | |
42e5c802 | 2581 | chan->expected_ack_seq = 0; |
6a026610 | 2582 | chan->unacked_frames = 0; |
42e5c802 | 2583 | chan->buffer_seq = 0; |
6a026610 | 2584 | chan->frames_sent = 0; |
105bdf9e MM |
2585 | chan->last_acked_seq = 0; |
2586 | chan->sdu = NULL; | |
2587 | chan->sdu_last_frag = NULL; | |
2588 | chan->sdu_len = 0; | |
2589 | ||
d34c34fb MM |
2590 | skb_queue_head_init(&chan->tx_q); |
2591 | ||
105bdf9e MM |
2592 | if (chan->mode != L2CAP_MODE_ERTM) |
2593 | return 0; | |
2594 | ||
2595 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2596 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2597 | |
721c4181 GP |
2598 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2599 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2600 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2601 | |
f1c6775b | 2602 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2603 | |
3c588192 MM |
2604 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2605 | if (err < 0) | |
2606 | return err; | |
2607 | ||
9dc9affc MM |
2608 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2609 | if (err < 0) | |
2610 | l2cap_seq_list_free(&chan->srej_list); | |
2611 | ||
2612 | return err; | |
0565c1c2 GP |
2613 | } |
2614 | ||
f2fcfcd6 GP |
2615 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2616 | { | |
2617 | switch (mode) { | |
2618 | case L2CAP_MODE_STREAMING: | |
2619 | case L2CAP_MODE_ERTM: | |
2620 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2621 | return mode; | |
2622 | /* fall through */ | |
2623 | default: | |
2624 | return L2CAP_MODE_BASIC; | |
2625 | } | |
2626 | } | |
2627 | ||
6327eb98 AE |
2628 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2629 | { | |
2630 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2631 | } | |
2632 | ||
f89cef09 AE |
2633 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2634 | { | |
2635 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2636 | } | |
2637 | ||
6327eb98 AE |
2638 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2639 | { | |
2640 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2641 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2642 | /* use extended control field */ |
2643 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2644 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2645 | } else { | |
6327eb98 AE |
2646 | chan->tx_win = min_t(u16, chan->tx_win, |
2647 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2648 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2649 | } | |
6327eb98 AE |
2650 | } |
2651 | ||
710f9b0a | 2652 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2653 | { |
1da177e4 | 2654 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2655 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2656 | void *ptr = req->data; |
c8f79162 | 2657 | u16 size; |
1da177e4 | 2658 | |
49208c9c | 2659 | BT_DBG("chan %p", chan); |
1da177e4 | 2660 | |
73ffa904 | 2661 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2662 | goto done; |
2663 | ||
0c1bc5c6 | 2664 | switch (chan->mode) { |
f2fcfcd6 GP |
2665 | case L2CAP_MODE_STREAMING: |
2666 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2667 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2668 | break; |
85eb53c6 | 2669 | |
f89cef09 AE |
2670 | if (__l2cap_efs_supported(chan)) |
2671 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2672 | ||
2ba13ed6 | 2673 | /* fall through */ |
f2fcfcd6 | 2674 | default: |
8c1d787b | 2675 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2676 | break; |
2677 | } | |
2678 | ||
2679 | done: | |
0c1bc5c6 GP |
2680 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2681 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2682 | |
0c1bc5c6 | 2683 | switch (chan->mode) { |
65c7c491 | 2684 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2685 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2686 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2687 | break; |
2688 | ||
62547752 GP |
2689 | rfc.mode = L2CAP_MODE_BASIC; |
2690 | rfc.txwin_size = 0; | |
2691 | rfc.max_transmit = 0; | |
2692 | rfc.retrans_timeout = 0; | |
2693 | rfc.monitor_timeout = 0; | |
2694 | rfc.max_pdu_size = 0; | |
2695 | ||
63406504 GP |
2696 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2697 | (unsigned long) &rfc); | |
65c7c491 MH |
2698 | break; |
2699 | ||
2700 | case L2CAP_MODE_ERTM: | |
2701 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2702 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2703 | rfc.retrans_timeout = 0; |
2704 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2705 | |
2706 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2707 | L2CAP_EXT_HDR_SIZE - | |
2708 | L2CAP_SDULEN_SIZE - | |
2709 | L2CAP_FCS_SIZE); | |
2710 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2711 | |
6327eb98 AE |
2712 | l2cap_txwin_setup(chan); |
2713 | ||
2714 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2715 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2716 | |
63406504 GP |
2717 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2718 | (unsigned long) &rfc); | |
2719 | ||
f89cef09 AE |
2720 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2721 | l2cap_add_opt_efs(&ptr, chan); | |
2722 | ||
8c1d787b | 2723 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2724 | break; |
2725 | ||
47d1ec61 | 2726 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2727 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2728 | chan->fcs = L2CAP_FCS_NONE; |
2729 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2730 | } |
6327eb98 AE |
2731 | |
2732 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2733 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2734 | chan->tx_win); | |
f2fcfcd6 GP |
2735 | break; |
2736 | ||
2737 | case L2CAP_MODE_STREAMING: | |
2738 | rfc.mode = L2CAP_MODE_STREAMING; | |
2739 | rfc.txwin_size = 0; | |
2740 | rfc.max_transmit = 0; | |
2741 | rfc.retrans_timeout = 0; | |
2742 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2743 | |
2744 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2745 | L2CAP_EXT_HDR_SIZE - | |
2746 | L2CAP_SDULEN_SIZE - | |
2747 | L2CAP_FCS_SIZE); | |
2748 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2749 | |
63406504 GP |
2750 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2751 | (unsigned long) &rfc); | |
2752 | ||
f89cef09 AE |
2753 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2754 | l2cap_add_opt_efs(&ptr, chan); | |
2755 | ||
8c1d787b | 2756 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2757 | break; |
2758 | ||
47d1ec61 | 2759 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2760 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2761 | chan->fcs = L2CAP_FCS_NONE; |
2762 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2763 | } |
65c7c491 MH |
2764 | break; |
2765 | } | |
1da177e4 | 2766 | |
fe4128e0 | 2767 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2768 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2769 | |
2770 | return ptr - data; | |
2771 | } | |
2772 | ||
73ffa904 | 2773 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2774 | { |
5dee9e7c MH |
2775 | struct l2cap_conf_rsp *rsp = data; |
2776 | void *ptr = rsp->data; | |
73ffa904 GP |
2777 | void *req = chan->conf_req; |
2778 | int len = chan->conf_len; | |
5dee9e7c MH |
2779 | int type, hint, olen; |
2780 | unsigned long val; | |
6464f35f | 2781 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2782 | struct l2cap_conf_efs efs; |
2783 | u8 remote_efs = 0; | |
861d6882 | 2784 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2785 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2786 | u16 size; |
1da177e4 | 2787 | |
73ffa904 | 2788 | BT_DBG("chan %p", chan); |
820ae1b8 | 2789 | |
5dee9e7c MH |
2790 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2791 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2792 | |
589d2746 | 2793 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2794 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2795 | |
2796 | switch (type) { | |
2797 | case L2CAP_CONF_MTU: | |
861d6882 | 2798 | mtu = val; |
5dee9e7c MH |
2799 | break; |
2800 | ||
2801 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2802 | chan->flush_to = val; |
5dee9e7c MH |
2803 | break; |
2804 | ||
2805 | case L2CAP_CONF_QOS: | |
2806 | break; | |
2807 | ||
6464f35f MH |
2808 | case L2CAP_CONF_RFC: |
2809 | if (olen == sizeof(rfc)) | |
2810 | memcpy(&rfc, (void *) val, olen); | |
2811 | break; | |
2812 | ||
fcc203c3 GP |
2813 | case L2CAP_CONF_FCS: |
2814 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2815 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2816 | break; |
fcc203c3 | 2817 | |
42dceae2 AE |
2818 | case L2CAP_CONF_EFS: |
2819 | remote_efs = 1; | |
2820 | if (olen == sizeof(efs)) | |
2821 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2822 | break; |
2823 | ||
6327eb98 AE |
2824 | case L2CAP_CONF_EWS: |
2825 | if (!enable_hs) | |
2826 | return -ECONNREFUSED; | |
fcc203c3 | 2827 | |
6327eb98 AE |
2828 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2829 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2830 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2831 | chan->remote_tx_win = val; |
fcc203c3 GP |
2832 | break; |
2833 | ||
5dee9e7c MH |
2834 | default: |
2835 | if (hint) | |
2836 | break; | |
2837 | ||
2838 | result = L2CAP_CONF_UNKNOWN; | |
2839 | *((u8 *) ptr++) = type; | |
2840 | break; | |
2841 | } | |
2842 | } | |
2843 | ||
73ffa904 | 2844 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2845 | goto done; |
2846 | ||
0c1bc5c6 | 2847 | switch (chan->mode) { |
f2fcfcd6 GP |
2848 | case L2CAP_MODE_STREAMING: |
2849 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2850 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2851 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2852 | chan->conn->feat_mask); |
85eb53c6 GP |
2853 | break; |
2854 | } | |
2855 | ||
42dceae2 AE |
2856 | if (remote_efs) { |
2857 | if (__l2cap_efs_supported(chan)) | |
2858 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2859 | else | |
2860 | return -ECONNREFUSED; | |
2861 | } | |
2862 | ||
0c1bc5c6 | 2863 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2864 | return -ECONNREFUSED; |
742e519b | 2865 | |
f2fcfcd6 | 2866 | break; |
f2fcfcd6 GP |
2867 | } |
2868 | ||
2869 | done: | |
0c1bc5c6 | 2870 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2871 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2872 | rfc.mode = chan->mode; |
f2fcfcd6 | 2873 | |
73ffa904 | 2874 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2875 | return -ECONNREFUSED; |
2876 | ||
2877 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2878 | sizeof(rfc), (unsigned long) &rfc); | |
2879 | } | |
2880 | ||
5dee9e7c MH |
2881 | if (result == L2CAP_CONF_SUCCESS) { |
2882 | /* Configure output options and let the other side know | |
2883 | * which ones we don't like. */ | |
2884 | ||
f2fcfcd6 GP |
2885 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2886 | result = L2CAP_CONF_UNACCEPT; | |
2887 | else { | |
0c1bc5c6 | 2888 | chan->omtu = mtu; |
c1360a1c | 2889 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2890 | } |
0c1bc5c6 | 2891 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2892 | |
42dceae2 AE |
2893 | if (remote_efs) { |
2894 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2895 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2896 | efs.stype != chan->local_stype) { | |
2897 | ||
2898 | result = L2CAP_CONF_UNACCEPT; | |
2899 | ||
2900 | if (chan->num_conf_req >= 1) | |
2901 | return -ECONNREFUSED; | |
2902 | ||
2903 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2904 | sizeof(efs), |
42dceae2 | 2905 | (unsigned long) &efs); |
0e8b207e | 2906 | } else { |
3e6b3b95 | 2907 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2908 | result = L2CAP_CONF_PENDING; |
2909 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2910 | } |
2911 | } | |
2912 | ||
f2fcfcd6 GP |
2913 | switch (rfc.mode) { |
2914 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2915 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2916 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2917 | break; |
2918 | ||
2919 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2920 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2921 | chan->remote_tx_win = rfc.txwin_size; | |
2922 | else | |
2923 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2924 | |
2c03a7a4 | 2925 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2926 | |
c8f79162 AE |
2927 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2928 | chan->conn->mtu - | |
2929 | L2CAP_EXT_HDR_SIZE - | |
2930 | L2CAP_SDULEN_SIZE - | |
2931 | L2CAP_FCS_SIZE); | |
2932 | rfc.max_pdu_size = cpu_to_le16(size); | |
2933 | chan->remote_mps = size; | |
f2fcfcd6 | 2934 | |
10467e9e | 2935 | rfc.retrans_timeout = |
4fd21a88 | 2936 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 2937 | rfc.monitor_timeout = |
4fd21a88 | 2938 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 2939 | |
c1360a1c | 2940 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2941 | |
2942 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2943 | sizeof(rfc), (unsigned long) &rfc); | |
2944 | ||
42dceae2 AE |
2945 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2946 | chan->remote_id = efs.id; | |
2947 | chan->remote_stype = efs.stype; | |
2948 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2949 | chan->remote_flush_to = | |
2950 | le32_to_cpu(efs.flush_to); | |
2951 | chan->remote_acc_lat = | |
2952 | le32_to_cpu(efs.acc_lat); | |
2953 | chan->remote_sdu_itime = | |
2954 | le32_to_cpu(efs.sdu_itime); | |
2955 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2956 | sizeof(efs), (unsigned long) &efs); | |
2957 | } | |
f2fcfcd6 GP |
2958 | break; |
2959 | ||
2960 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2961 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2962 | chan->conn->mtu - | |
2963 | L2CAP_EXT_HDR_SIZE - | |
2964 | L2CAP_SDULEN_SIZE - | |
2965 | L2CAP_FCS_SIZE); | |
2966 | rfc.max_pdu_size = cpu_to_le16(size); | |
2967 | chan->remote_mps = size; | |
f2fcfcd6 | 2968 | |
c1360a1c | 2969 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2970 | |
2971 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2972 | sizeof(rfc), (unsigned long) &rfc); | |
2973 | ||
f2fcfcd6 GP |
2974 | break; |
2975 | ||
2976 | default: | |
5dee9e7c | 2977 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2978 | |
6464f35f | 2979 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2980 | rfc.mode = chan->mode; |
f2fcfcd6 | 2981 | } |
6464f35f | 2982 | |
f2fcfcd6 | 2983 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2984 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2985 | } |
fe4128e0 | 2986 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2987 | rsp->result = cpu_to_le16(result); |
2988 | rsp->flags = cpu_to_le16(0x0000); | |
2989 | ||
2990 | return ptr - data; | |
1da177e4 LT |
2991 | } |
2992 | ||
b4450035 | 2993 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2994 | { |
f2fcfcd6 GP |
2995 | struct l2cap_conf_req *req = data; |
2996 | void *ptr = req->data; | |
2997 | int type, olen; | |
2998 | unsigned long val; | |
36e999a8 | 2999 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3000 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3001 | |
fe4128e0 | 3002 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3003 | |
3004 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3005 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3006 | ||
3007 | switch (type) { | |
3008 | case L2CAP_CONF_MTU: | |
3009 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3010 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3011 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3012 | } else |
0c1bc5c6 GP |
3013 | chan->imtu = val; |
3014 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3015 | break; |
3016 | ||
3017 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3018 | chan->flush_to = val; |
f2fcfcd6 | 3019 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3020 | 2, chan->flush_to); |
f2fcfcd6 GP |
3021 | break; |
3022 | ||
3023 | case L2CAP_CONF_RFC: | |
3024 | if (olen == sizeof(rfc)) | |
3025 | memcpy(&rfc, (void *)val, olen); | |
3026 | ||
c1360a1c | 3027 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3028 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3029 | return -ECONNREFUSED; |
3030 | ||
47d1ec61 | 3031 | chan->fcs = 0; |
f2fcfcd6 GP |
3032 | |
3033 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3034 | sizeof(rfc), (unsigned long) &rfc); | |
3035 | break; | |
6327eb98 AE |
3036 | |
3037 | case L2CAP_CONF_EWS: | |
3038 | chan->tx_win = min_t(u16, val, | |
3039 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3040 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3041 | chan->tx_win); | |
6327eb98 | 3042 | break; |
66af7aaf AE |
3043 | |
3044 | case L2CAP_CONF_EFS: | |
3045 | if (olen == sizeof(efs)) | |
3046 | memcpy(&efs, (void *)val, olen); | |
3047 | ||
3048 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3049 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3050 | efs.stype != chan->local_stype) | |
3051 | return -ECONNREFUSED; | |
3052 | ||
3053 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3054 | sizeof(efs), (unsigned long) &efs); | |
3055 | break; | |
f2fcfcd6 GP |
3056 | } |
3057 | } | |
3058 | ||
0c1bc5c6 | 3059 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3060 | return -ECONNREFUSED; |
3061 | ||
0c1bc5c6 | 3062 | chan->mode = rfc.mode; |
6c2ea7a8 | 3063 | |
0e8b207e | 3064 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3065 | switch (rfc.mode) { |
3066 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3067 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3068 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3069 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3070 | |
3071 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3072 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3073 | chan->local_sdu_itime = | |
3074 | le32_to_cpu(efs.sdu_itime); | |
3075 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3076 | chan->local_flush_to = | |
3077 | le32_to_cpu(efs.flush_to); | |
3078 | } | |
f2fcfcd6 | 3079 | break; |
66af7aaf | 3080 | |
f2fcfcd6 | 3081 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3082 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3083 | } |
3084 | } | |
3085 | ||
fe4128e0 | 3086 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
3087 | req->flags = cpu_to_le16(0x0000); |
3088 | ||
3089 | return ptr - data; | |
3090 | } | |
3091 | ||
fe4128e0 | 3092 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3093 | { |
3094 | struct l2cap_conf_rsp *rsp = data; | |
3095 | void *ptr = rsp->data; | |
1da177e4 | 3096 | |
fe4128e0 | 3097 | BT_DBG("chan %p", chan); |
1da177e4 | 3098 | |
fe4128e0 | 3099 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3100 | rsp->result = cpu_to_le16(result); |
aca3192c | 3101 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3102 | |
3103 | return ptr - data; | |
3104 | } | |
3105 | ||
8c1d787b | 3106 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3107 | { |
3108 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3109 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3110 | u8 buf[128]; |
3111 | ||
fe4128e0 GP |
3112 | rsp.scid = cpu_to_le16(chan->dcid); |
3113 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
3114 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3115 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
3116 | l2cap_send_cmd(conn, chan->ident, | |
3117 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3118 | ||
c1360a1c | 3119 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3120 | return; |
3121 | ||
710f9b0a GP |
3122 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3123 | l2cap_build_conf_req(chan, buf), buf); | |
3124 | chan->num_conf_req++; | |
3125 | } | |
3126 | ||
47d1ec61 | 3127 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3128 | { |
7b1c0049 GP |
3129 | int type, olen; |
3130 | unsigned long val; | |
3131 | struct l2cap_conf_rfc rfc; | |
3132 | ||
47d1ec61 | 3133 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3134 | |
0c1bc5c6 | 3135 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3136 | return; |
3137 | ||
3138 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3139 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3140 | ||
3141 | switch (type) { | |
3142 | case L2CAP_CONF_RFC: | |
3143 | if (olen == sizeof(rfc)) | |
3144 | memcpy(&rfc, (void *)val, olen); | |
3145 | goto done; | |
3146 | } | |
3147 | } | |
3148 | ||
36e999a8 MM |
3149 | /* Use sane default values in case a misbehaving remote device |
3150 | * did not send an RFC option. | |
3151 | */ | |
3152 | rfc.mode = chan->mode; | |
3153 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3154 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3155 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
3156 | ||
3157 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3158 | ||
7b1c0049 GP |
3159 | done: |
3160 | switch (rfc.mode) { | |
3161 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3162 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3163 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3164 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3165 | break; |
3166 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3167 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3168 | } |
3169 | } | |
3170 | ||
4e8402a3 MH |
3171 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3172 | { | |
e2fd318e | 3173 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3174 | |
e2fd318e | 3175 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3176 | return 0; |
3177 | ||
3178 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3179 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3180 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3181 | |
3182 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3183 | conn->info_ident = 0; |
984947dc | 3184 | |
4e8402a3 MH |
3185 | l2cap_conn_start(conn); |
3186 | } | |
3187 | ||
3188 | return 0; | |
3189 | } | |
3190 | ||
1da177e4 LT |
3191 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3192 | { | |
1da177e4 LT |
3193 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3194 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3195 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3196 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3197 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3198 | |
3199 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3200 | __le16 psm = req->psm; |
1da177e4 | 3201 | |
097db76c | 3202 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3203 | |
3204 | /* Check if we have socket listening on psm */ | |
c2287681 | 3205 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3206 | if (!pchan) { |
1da177e4 LT |
3207 | result = L2CAP_CR_BAD_PSM; |
3208 | goto sendresp; | |
3209 | } | |
3210 | ||
23691d75 GP |
3211 | parent = pchan->sk; |
3212 | ||
3df91ea2 | 3213 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3214 | lock_sock(parent); |
e0f0cb56 | 3215 | |
e7c29cb1 MH |
3216 | /* Check if the ACL is secure enough (if not SDP) */ |
3217 | if (psm != cpu_to_le16(0x0001) && | |
3218 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 3219 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3220 | result = L2CAP_CR_SEC_BLOCK; |
3221 | goto response; | |
3222 | } | |
3223 | ||
1da177e4 LT |
3224 | result = L2CAP_CR_NO_MEM; |
3225 | ||
3226 | /* Check for backlog size */ | |
3227 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 3228 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
3229 | goto response; |
3230 | } | |
3231 | ||
80808e43 GP |
3232 | chan = pchan->ops->new_connection(pchan->data); |
3233 | if (!chan) | |
1da177e4 LT |
3234 | goto response; |
3235 | ||
80808e43 GP |
3236 | sk = chan->sk; |
3237 | ||
1da177e4 | 3238 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3239 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3240 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3241 | chan->ops->close(chan->data); |
1da177e4 LT |
3242 | goto response; |
3243 | } | |
3244 | ||
3245 | hci_conn_hold(conn->hcon); | |
3246 | ||
1da177e4 LT |
3247 | bacpy(&bt_sk(sk)->src, conn->src); |
3248 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3249 | chan->psm = psm; |
3250 | chan->dcid = scid; | |
1da177e4 | 3251 | |
d1010240 GP |
3252 | bt_accept_enqueue(parent, sk); |
3253 | ||
6be36555 | 3254 | __l2cap_chan_add(conn, chan); |
48454079 | 3255 | |
fe4128e0 | 3256 | dcid = chan->scid; |
1da177e4 | 3257 | |
c9b66675 | 3258 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3259 | |
fc7f8a7e | 3260 | chan->ident = cmd->ident; |
1da177e4 | 3261 | |
984947dc | 3262 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3263 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3264 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3265 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3266 | result = L2CAP_CR_PEND; |
3267 | status = L2CAP_CS_AUTHOR_PEND; | |
3268 | parent->sk_data_ready(parent, 0); | |
3269 | } else { | |
0e587be7 | 3270 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3271 | result = L2CAP_CR_SUCCESS; |
3272 | status = L2CAP_CS_NO_INFO; | |
3273 | } | |
79d554a6 | 3274 | } else { |
0e587be7 | 3275 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3276 | result = L2CAP_CR_PEND; |
3277 | status = L2CAP_CS_AUTHEN_PEND; | |
3278 | } | |
3279 | } else { | |
0e587be7 | 3280 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3281 | result = L2CAP_CR_PEND; |
3282 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3283 | } |
3284 | ||
1da177e4 | 3285 | response: |
aa2ac881 | 3286 | release_sock(parent); |
3df91ea2 | 3287 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3288 | |
3289 | sendresp: | |
aca3192c YH |
3290 | rsp.scid = cpu_to_le16(scid); |
3291 | rsp.dcid = cpu_to_le16(dcid); | |
3292 | rsp.result = cpu_to_le16(result); | |
3293 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3294 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3295 | |
3296 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3297 | struct l2cap_info_req info; | |
3298 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3299 | ||
3300 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3301 | conn->info_ident = l2cap_get_ident(conn); | |
3302 | ||
ba13ccd9 | 3303 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3304 | |
3305 | l2cap_send_cmd(conn, conn->info_ident, | |
3306 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3307 | } | |
3308 | ||
c1360a1c | 3309 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3310 | result == L2CAP_CR_SUCCESS) { |
3311 | u8 buf[128]; | |
c1360a1c | 3312 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3313 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3314 | l2cap_build_conf_req(chan, buf), buf); |
3315 | chan->num_conf_req++; | |
e9aeb2dd GP |
3316 | } |
3317 | ||
1da177e4 LT |
3318 | return 0; |
3319 | } | |
3320 | ||
3321 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3322 | { | |
3323 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3324 | u16 scid, dcid, result, status; | |
48454079 | 3325 | struct l2cap_chan *chan; |
1da177e4 | 3326 | u8 req[128]; |
3df91ea2 | 3327 | int err; |
1da177e4 LT |
3328 | |
3329 | scid = __le16_to_cpu(rsp->scid); | |
3330 | dcid = __le16_to_cpu(rsp->dcid); | |
3331 | result = __le16_to_cpu(rsp->result); | |
3332 | status = __le16_to_cpu(rsp->status); | |
3333 | ||
1b009c98 AE |
3334 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3335 | dcid, scid, result, status); | |
1da177e4 | 3336 | |
3df91ea2 AE |
3337 | mutex_lock(&conn->chan_lock); |
3338 | ||
1da177e4 | 3339 | if (scid) { |
3df91ea2 AE |
3340 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3341 | if (!chan) { | |
3342 | err = -EFAULT; | |
3343 | goto unlock; | |
3344 | } | |
1da177e4 | 3345 | } else { |
3df91ea2 AE |
3346 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3347 | if (!chan) { | |
3348 | err = -EFAULT; | |
3349 | goto unlock; | |
3350 | } | |
1da177e4 LT |
3351 | } |
3352 | ||
3df91ea2 AE |
3353 | err = 0; |
3354 | ||
6be36555 | 3355 | l2cap_chan_lock(chan); |
48454079 | 3356 | |
1da177e4 LT |
3357 | switch (result) { |
3358 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3359 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3360 | chan->ident = 0; |
fe4128e0 | 3361 | chan->dcid = dcid; |
c1360a1c | 3362 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3363 | |
c1360a1c | 3364 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3365 | break; |
3366 | ||
1da177e4 | 3367 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3368 | l2cap_build_conf_req(chan, req), req); |
3369 | chan->num_conf_req++; | |
1da177e4 LT |
3370 | break; |
3371 | ||
3372 | case L2CAP_CR_PEND: | |
c1360a1c | 3373 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3374 | break; |
3375 | ||
3376 | default: | |
48454079 | 3377 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3378 | break; |
3379 | } | |
3380 | ||
6be36555 | 3381 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3382 | |
3383 | unlock: | |
3384 | mutex_unlock(&conn->chan_lock); | |
3385 | ||
3386 | return err; | |
1da177e4 LT |
3387 | } |
3388 | ||
47d1ec61 | 3389 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3390 | { |
3391 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3392 | * sides request it. | |
3393 | */ | |
0c1bc5c6 | 3394 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3395 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3396 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3397 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3398 | } |
3399 | ||
88219a0f | 3400 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3401 | { |
3402 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3403 | u16 dcid, flags; | |
3404 | u8 rsp[64]; | |
48454079 | 3405 | struct l2cap_chan *chan; |
3c588192 | 3406 | int len, err = 0; |
1da177e4 LT |
3407 | |
3408 | dcid = __le16_to_cpu(req->dcid); | |
3409 | flags = __le16_to_cpu(req->flags); | |
3410 | ||
3411 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3412 | ||
baa7e1fa | 3413 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3414 | if (!chan) |
1da177e4 LT |
3415 | return -ENOENT; |
3416 | ||
033b1142 | 3417 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3418 | struct l2cap_cmd_rej_cid rej; |
3419 | ||
3420 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3421 | rej.scid = cpu_to_le16(chan->scid); | |
3422 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3423 | |
df6bd743 GP |
3424 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3425 | sizeof(rej), &rej); | |
354f60a9 | 3426 | goto unlock; |
df6bd743 | 3427 | } |
354f60a9 | 3428 | |
5dee9e7c | 3429 | /* Reject if config buffer is too small. */ |
88219a0f | 3430 | len = cmd_len - sizeof(*req); |
7ac28817 | 3431 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3432 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3433 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3434 | L2CAP_CONF_REJECT, flags), rsp); |
3435 | goto unlock; | |
3436 | } | |
3437 | ||
3438 | /* Store config. */ | |
73ffa904 GP |
3439 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3440 | chan->conf_len += len; | |
1da177e4 LT |
3441 | |
3442 | if (flags & 0x0001) { | |
3443 | /* Incomplete config. Send empty response. */ | |
3444 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3445 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 3446 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
3447 | goto unlock; |
3448 | } | |
3449 | ||
3450 | /* Complete config. */ | |
73ffa904 | 3451 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3452 | if (len < 0) { |
e92c8e70 | 3453 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3454 | goto unlock; |
f2fcfcd6 | 3455 | } |
1da177e4 | 3456 | |
5dee9e7c | 3457 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3458 | chan->num_conf_rsp++; |
5dee9e7c | 3459 | |
5dee9e7c | 3460 | /* Reset config buffer. */ |
73ffa904 | 3461 | chan->conf_len = 0; |
5dee9e7c | 3462 | |
c1360a1c | 3463 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3464 | goto unlock; |
3465 | ||
c1360a1c | 3466 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3467 | set_default_fcs(chan); |
fcc203c3 | 3468 | |
89bc500e | 3469 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 3470 | |
105bdf9e MM |
3471 | if (chan->mode == L2CAP_MODE_ERTM || |
3472 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3473 | err = l2cap_ertm_init(chan); |
3474 | ||
3475 | if (err < 0) | |
3476 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3477 | else | |
3478 | l2cap_chan_ready(chan); | |
0565c1c2 | 3479 | |
876d9484 MH |
3480 | goto unlock; |
3481 | } | |
3482 | ||
c1360a1c | 3483 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3484 | u8 buf[64]; |
1da177e4 | 3485 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3486 | l2cap_build_conf_req(chan, buf), buf); |
3487 | chan->num_conf_req++; | |
1da177e4 LT |
3488 | } |
3489 | ||
0e8b207e AE |
3490 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3491 | Conf Rsp PENDING in the code above */ | |
3492 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3493 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3494 | ||
3495 | /* check compatibility */ | |
3496 | ||
3497 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3498 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3499 | ||
3500 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3501 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
3502 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
3503 | } | |
3504 | ||
1da177e4 | 3505 | unlock: |
6be36555 | 3506 | l2cap_chan_unlock(chan); |
3c588192 | 3507 | return err; |
1da177e4 LT |
3508 | } |
3509 | ||
3510 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3511 | { | |
3512 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3513 | u16 scid, flags, result; | |
48454079 | 3514 | struct l2cap_chan *chan; |
61386cba | 3515 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3516 | int err = 0; |
1da177e4 LT |
3517 | |
3518 | scid = __le16_to_cpu(rsp->scid); | |
3519 | flags = __le16_to_cpu(rsp->flags); | |
3520 | result = __le16_to_cpu(rsp->result); | |
3521 | ||
61386cba AE |
3522 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3523 | result, len); | |
1da177e4 | 3524 | |
baa7e1fa | 3525 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3526 | if (!chan) |
1da177e4 LT |
3527 | return 0; |
3528 | ||
3529 | switch (result) { | |
3530 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3531 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3532 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3533 | break; |
3534 | ||
0e8b207e AE |
3535 | case L2CAP_CONF_PENDING: |
3536 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3537 | ||
3538 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3539 | char buf[64]; | |
3540 | ||
3541 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3542 | buf, &result); | |
3543 | if (len < 0) { | |
3544 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3545 | goto done; | |
3546 | } | |
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, buf, |
0e8b207e AE |
3555 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3556 | } | |
3557 | goto done; | |
3558 | ||
1da177e4 | 3559 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3560 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3561 | char req[64]; |
3562 | ||
c2c77ec8 | 3563 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3564 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3565 | goto done; |
3566 | } | |
3567 | ||
f2fcfcd6 GP |
3568 | /* throw out any old stored conf requests */ |
3569 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3570 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3571 | req, &result); | |
f2fcfcd6 | 3572 | if (len < 0) { |
e92c8e70 | 3573 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3574 | goto done; |
3575 | } | |
3576 | ||
3577 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3578 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3579 | chan->num_conf_req++; |
f2fcfcd6 GP |
3580 | if (result != L2CAP_CONF_SUCCESS) |
3581 | goto done; | |
3582 | break; | |
1da177e4 LT |
3583 | } |
3584 | ||
8e87d142 | 3585 | default: |
6be36555 | 3586 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3587 | |
ba13ccd9 | 3588 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3589 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3590 | goto done; |
3591 | } | |
3592 | ||
3593 | if (flags & 0x01) | |
3594 | goto done; | |
3595 | ||
c1360a1c | 3596 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3597 | |
c1360a1c | 3598 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3599 | set_default_fcs(chan); |
fcc203c3 | 3600 | |
89bc500e | 3601 | l2cap_state_change(chan, BT_CONNECTED); |
105bdf9e MM |
3602 | if (chan->mode == L2CAP_MODE_ERTM || |
3603 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3604 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3605 | |
3c588192 MM |
3606 | if (err < 0) |
3607 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3608 | else | |
3609 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3610 | } |
3611 | ||
3612 | done: | |
6be36555 | 3613 | l2cap_chan_unlock(chan); |
3c588192 | 3614 | return err; |
1da177e4 LT |
3615 | } |
3616 | ||
3617 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3618 | { | |
3619 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3620 | struct l2cap_disconn_rsp rsp; | |
3621 | u16 dcid, scid; | |
48454079 | 3622 | struct l2cap_chan *chan; |
1da177e4 LT |
3623 | struct sock *sk; |
3624 | ||
3625 | scid = __le16_to_cpu(req->scid); | |
3626 | dcid = __le16_to_cpu(req->dcid); | |
3627 | ||
3628 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3629 | ||
3df91ea2 AE |
3630 | mutex_lock(&conn->chan_lock); |
3631 | ||
3632 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3633 | if (!chan) { | |
3634 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3635 | return 0; |
3df91ea2 | 3636 | } |
1da177e4 | 3637 | |
6be36555 AE |
3638 | l2cap_chan_lock(chan); |
3639 | ||
48454079 GP |
3640 | sk = chan->sk; |
3641 | ||
fe4128e0 GP |
3642 | rsp.dcid = cpu_to_le16(chan->scid); |
3643 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3644 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3645 | ||
6be36555 | 3646 | lock_sock(sk); |
1da177e4 | 3647 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3648 | release_sock(sk); |
1da177e4 | 3649 | |
61d6ef3e | 3650 | l2cap_chan_hold(chan); |
48454079 | 3651 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3652 | |
3653 | l2cap_chan_unlock(chan); | |
1da177e4 | 3654 | |
ba3bd0ee | 3655 | chan->ops->close(chan->data); |
61d6ef3e | 3656 | l2cap_chan_put(chan); |
3df91ea2 AE |
3657 | |
3658 | mutex_unlock(&conn->chan_lock); | |
3659 | ||
1da177e4 LT |
3660 | return 0; |
3661 | } | |
3662 | ||
3663 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3664 | { | |
3665 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3666 | u16 dcid, scid; | |
48454079 | 3667 | struct l2cap_chan *chan; |
1da177e4 LT |
3668 | |
3669 | scid = __le16_to_cpu(rsp->scid); | |
3670 | dcid = __le16_to_cpu(rsp->dcid); | |
3671 | ||
3672 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3673 | ||
3df91ea2 AE |
3674 | mutex_lock(&conn->chan_lock); |
3675 | ||
3676 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3677 | if (!chan) { | |
3678 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3679 | return 0; |
3df91ea2 | 3680 | } |
1da177e4 | 3681 | |
6be36555 | 3682 | l2cap_chan_lock(chan); |
48454079 | 3683 | |
61d6ef3e | 3684 | l2cap_chan_hold(chan); |
48454079 | 3685 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3686 | |
3687 | l2cap_chan_unlock(chan); | |
1da177e4 | 3688 | |
ba3bd0ee | 3689 | chan->ops->close(chan->data); |
61d6ef3e | 3690 | l2cap_chan_put(chan); |
3df91ea2 AE |
3691 | |
3692 | mutex_unlock(&conn->chan_lock); | |
3693 | ||
1da177e4 LT |
3694 | return 0; |
3695 | } | |
3696 | ||
3697 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3698 | { | |
3699 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3700 | u16 type; |
3701 | ||
3702 | type = __le16_to_cpu(req->type); | |
3703 | ||
3704 | BT_DBG("type 0x%4.4x", type); | |
3705 | ||
f0709e03 MH |
3706 | if (type == L2CAP_IT_FEAT_MASK) { |
3707 | u8 buf[8]; | |
44dd46de | 3708 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3709 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3710 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3711 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3712 | if (!disable_ertm) |
fcc203c3 GP |
3713 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3714 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3715 | if (enable_hs) |
6327eb98 AE |
3716 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3717 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3718 | |
1b7bf4ed | 3719 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3720 | l2cap_send_cmd(conn, cmd->ident, |
3721 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3722 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3723 | u8 buf[12]; | |
3724 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3725 | |
3726 | if (enable_hs) | |
3727 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3728 | else | |
3729 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3730 | ||
e1027a7c MH |
3731 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3732 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3733 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3734 | l2cap_send_cmd(conn, cmd->ident, |
3735 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3736 | } else { |
3737 | struct l2cap_info_rsp rsp; | |
3738 | rsp.type = cpu_to_le16(type); | |
3739 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3740 | l2cap_send_cmd(conn, cmd->ident, | |
3741 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3742 | } | |
1da177e4 LT |
3743 | |
3744 | return 0; | |
3745 | } | |
3746 | ||
3747 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3748 | { | |
3749 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3750 | u16 type, result; | |
3751 | ||
3752 | type = __le16_to_cpu(rsp->type); | |
3753 | result = __le16_to_cpu(rsp->result); | |
3754 | ||
3755 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3756 | ||
e90165be AE |
3757 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3758 | if (cmd->ident != conn->info_ident || | |
3759 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3760 | return 0; | |
3761 | ||
17cd3f37 | 3762 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3763 | |
adb08ede VT |
3764 | if (result != L2CAP_IR_SUCCESS) { |
3765 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3766 | conn->info_ident = 0; | |
3767 | ||
3768 | l2cap_conn_start(conn); | |
3769 | ||
3770 | return 0; | |
3771 | } | |
3772 | ||
978c93b9 AE |
3773 | switch (type) { |
3774 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3775 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3776 | |
47ec1dcd | 3777 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3778 | struct l2cap_info_req req; |
3779 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3780 | ||
3781 | conn->info_ident = l2cap_get_ident(conn); | |
3782 | ||
3783 | l2cap_send_cmd(conn, conn->info_ident, | |
3784 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3785 | } else { | |
3786 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3787 | conn->info_ident = 0; | |
3788 | ||
3789 | l2cap_conn_start(conn); | |
3790 | } | |
978c93b9 AE |
3791 | break; |
3792 | ||
3793 | case L2CAP_IT_FIXED_CHAN: | |
3794 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3795 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3796 | conn->info_ident = 0; |
984947dc MH |
3797 | |
3798 | l2cap_conn_start(conn); | |
978c93b9 | 3799 | break; |
984947dc | 3800 | } |
4e8402a3 | 3801 | |
1da177e4 LT |
3802 | return 0; |
3803 | } | |
3804 | ||
f94ff6ff MM |
3805 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3806 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3807 | void *data) | |
3808 | { | |
3809 | struct l2cap_create_chan_req *req = data; | |
3810 | struct l2cap_create_chan_rsp rsp; | |
3811 | u16 psm, scid; | |
3812 | ||
3813 | if (cmd_len != sizeof(*req)) | |
3814 | return -EPROTO; | |
3815 | ||
3816 | if (!enable_hs) | |
3817 | return -EINVAL; | |
3818 | ||
3819 | psm = le16_to_cpu(req->psm); | |
3820 | scid = le16_to_cpu(req->scid); | |
3821 | ||
3822 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3823 | ||
3824 | /* Placeholder: Always reject */ | |
3825 | rsp.dcid = 0; | |
3826 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3827 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3828 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3829 | |
3830 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3831 | sizeof(rsp), &rsp); | |
3832 | ||
3833 | return 0; | |
3834 | } | |
3835 | ||
3836 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3837 | struct l2cap_cmd_hdr *cmd, void *data) | |
3838 | { | |
3839 | BT_DBG("conn %p", conn); | |
3840 | ||
3841 | return l2cap_connect_rsp(conn, cmd, data); | |
3842 | } | |
3843 | ||
8d5a04a1 MM |
3844 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3845 | u16 icid, u16 result) | |
3846 | { | |
3847 | struct l2cap_move_chan_rsp rsp; | |
3848 | ||
3849 | BT_DBG("icid %d, result %d", icid, result); | |
3850 | ||
3851 | rsp.icid = cpu_to_le16(icid); | |
3852 | rsp.result = cpu_to_le16(result); | |
3853 | ||
3854 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3855 | } | |
3856 | ||
3857 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3858 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3859 | { | |
3860 | struct l2cap_move_chan_cfm cfm; | |
3861 | u8 ident; | |
3862 | ||
3863 | BT_DBG("icid %d, result %d", icid, result); | |
3864 | ||
3865 | ident = l2cap_get_ident(conn); | |
3866 | if (chan) | |
3867 | chan->ident = ident; | |
3868 | ||
3869 | cfm.icid = cpu_to_le16(icid); | |
3870 | cfm.result = cpu_to_le16(result); | |
3871 | ||
3872 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3873 | } | |
3874 | ||
3875 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3876 | u16 icid) | |
3877 | { | |
3878 | struct l2cap_move_chan_cfm_rsp rsp; | |
3879 | ||
3880 | BT_DBG("icid %d", icid); | |
3881 | ||
3882 | rsp.icid = cpu_to_le16(icid); | |
3883 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3884 | } | |
3885 | ||
3886 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3887 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3888 | { | |
3889 | struct l2cap_move_chan_req *req = data; | |
3890 | u16 icid = 0; | |
3891 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3892 | ||
3893 | if (cmd_len != sizeof(*req)) | |
3894 | return -EPROTO; | |
3895 | ||
3896 | icid = le16_to_cpu(req->icid); | |
3897 | ||
3898 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3899 | ||
3900 | if (!enable_hs) | |
3901 | return -EINVAL; | |
3902 | ||
3903 | /* Placeholder: Always refuse */ | |
3904 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3905 | ||
3906 | return 0; | |
3907 | } | |
3908 | ||
3909 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3910 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3911 | { | |
3912 | struct l2cap_move_chan_rsp *rsp = data; | |
3913 | u16 icid, result; | |
3914 | ||
3915 | if (cmd_len != sizeof(*rsp)) | |
3916 | return -EPROTO; | |
3917 | ||
3918 | icid = le16_to_cpu(rsp->icid); | |
3919 | result = le16_to_cpu(rsp->result); | |
3920 | ||
3921 | BT_DBG("icid %d, result %d", icid, result); | |
3922 | ||
3923 | /* Placeholder: Always unconfirmed */ | |
3924 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3925 | ||
3926 | return 0; | |
3927 | } | |
3928 | ||
3929 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3930 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3931 | { | |
3932 | struct l2cap_move_chan_cfm *cfm = data; | |
3933 | u16 icid, result; | |
3934 | ||
3935 | if (cmd_len != sizeof(*cfm)) | |
3936 | return -EPROTO; | |
3937 | ||
3938 | icid = le16_to_cpu(cfm->icid); | |
3939 | result = le16_to_cpu(cfm->result); | |
3940 | ||
3941 | BT_DBG("icid %d, result %d", icid, result); | |
3942 | ||
3943 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3944 | ||
3945 | return 0; | |
3946 | } | |
3947 | ||
3948 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3949 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3950 | { | |
3951 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3952 | u16 icid; | |
3953 | ||
3954 | if (cmd_len != sizeof(*rsp)) | |
3955 | return -EPROTO; | |
3956 | ||
3957 | icid = le16_to_cpu(rsp->icid); | |
3958 | ||
3959 | BT_DBG("icid %d", icid); | |
3960 | ||
3961 | return 0; | |
3962 | } | |
3963 | ||
e2174ca4 | 3964 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3965 | u16 to_multiplier) |
3966 | { | |
3967 | u16 max_latency; | |
3968 | ||
3969 | if (min > max || min < 6 || max > 3200) | |
3970 | return -EINVAL; | |
3971 | ||
3972 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3973 | return -EINVAL; | |
3974 | ||
3975 | if (max >= to_multiplier * 8) | |
3976 | return -EINVAL; | |
3977 | ||
3978 | max_latency = (to_multiplier * 8 / max) - 1; | |
3979 | if (latency > 499 || latency > max_latency) | |
3980 | return -EINVAL; | |
3981 | ||
3982 | return 0; | |
3983 | } | |
3984 | ||
3985 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3986 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3987 | { | |
3988 | struct hci_conn *hcon = conn->hcon; | |
3989 | struct l2cap_conn_param_update_req *req; | |
3990 | struct l2cap_conn_param_update_rsp rsp; | |
3991 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3992 | int err; |
de73115a CT |
3993 | |
3994 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3995 | return -EINVAL; | |
3996 | ||
3997 | cmd_len = __le16_to_cpu(cmd->len); | |
3998 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3999 | return -EPROTO; | |
4000 | ||
4001 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4002 | min = __le16_to_cpu(req->min); |
4003 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4004 | latency = __le16_to_cpu(req->latency); |
4005 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4006 | ||
4007 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4008 | min, max, latency, to_multiplier); | |
4009 | ||
4010 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4011 | |
4012 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4013 | if (err) | |
de73115a CT |
4014 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
4015 | else | |
4016 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
4017 | ||
4018 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4019 | sizeof(rsp), &rsp); | |
4020 | ||
2ce603eb CT |
4021 | if (!err) |
4022 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4023 | ||
de73115a CT |
4024 | return 0; |
4025 | } | |
4026 | ||
3300d9a9 CT |
4027 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4028 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4029 | { | |
4030 | int err = 0; | |
4031 | ||
4032 | switch (cmd->code) { | |
4033 | case L2CAP_COMMAND_REJ: | |
4034 | l2cap_command_rej(conn, cmd, data); | |
4035 | break; | |
4036 | ||
4037 | case L2CAP_CONN_REQ: | |
4038 | err = l2cap_connect_req(conn, cmd, data); | |
4039 | break; | |
4040 | ||
4041 | case L2CAP_CONN_RSP: | |
4042 | err = l2cap_connect_rsp(conn, cmd, data); | |
4043 | break; | |
4044 | ||
4045 | case L2CAP_CONF_REQ: | |
4046 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4047 | break; | |
4048 | ||
4049 | case L2CAP_CONF_RSP: | |
4050 | err = l2cap_config_rsp(conn, cmd, data); | |
4051 | break; | |
4052 | ||
4053 | case L2CAP_DISCONN_REQ: | |
4054 | err = l2cap_disconnect_req(conn, cmd, data); | |
4055 | break; | |
4056 | ||
4057 | case L2CAP_DISCONN_RSP: | |
4058 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4059 | break; | |
4060 | ||
4061 | case L2CAP_ECHO_REQ: | |
4062 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4063 | break; | |
4064 | ||
4065 | case L2CAP_ECHO_RSP: | |
4066 | break; | |
4067 | ||
4068 | case L2CAP_INFO_REQ: | |
4069 | err = l2cap_information_req(conn, cmd, data); | |
4070 | break; | |
4071 | ||
4072 | case L2CAP_INFO_RSP: | |
4073 | err = l2cap_information_rsp(conn, cmd, data); | |
4074 | break; | |
4075 | ||
f94ff6ff MM |
4076 | case L2CAP_CREATE_CHAN_REQ: |
4077 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4078 | break; | |
4079 | ||
4080 | case L2CAP_CREATE_CHAN_RSP: | |
4081 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4082 | break; | |
4083 | ||
8d5a04a1 MM |
4084 | case L2CAP_MOVE_CHAN_REQ: |
4085 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4086 | break; | |
4087 | ||
4088 | case L2CAP_MOVE_CHAN_RSP: | |
4089 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4090 | break; | |
4091 | ||
4092 | case L2CAP_MOVE_CHAN_CFM: | |
4093 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4094 | break; | |
4095 | ||
4096 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4097 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4098 | break; | |
4099 | ||
3300d9a9 CT |
4100 | default: |
4101 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4102 | err = -EINVAL; | |
4103 | break; | |
4104 | } | |
4105 | ||
4106 | return err; | |
4107 | } | |
4108 | ||
4109 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4110 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4111 | { | |
4112 | switch (cmd->code) { | |
4113 | case L2CAP_COMMAND_REJ: | |
4114 | return 0; | |
4115 | ||
4116 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4117 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4118 | |
4119 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4120 | return 0; | |
4121 | ||
4122 | default: | |
4123 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4124 | return -EINVAL; | |
4125 | } | |
4126 | } | |
4127 | ||
4128 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4129 | struct sk_buff *skb) | |
1da177e4 LT |
4130 | { |
4131 | u8 *data = skb->data; | |
4132 | int len = skb->len; | |
4133 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4134 | int err; |
1da177e4 LT |
4135 | |
4136 | l2cap_raw_recv(conn, skb); | |
4137 | ||
4138 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4139 | u16 cmd_len; |
1da177e4 LT |
4140 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4141 | data += L2CAP_CMD_HDR_SIZE; | |
4142 | len -= L2CAP_CMD_HDR_SIZE; | |
4143 | ||
88219a0f | 4144 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4145 | |
88219a0f | 4146 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4147 | |
88219a0f | 4148 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4149 | BT_DBG("corrupted command"); |
4150 | break; | |
4151 | } | |
4152 | ||
3300d9a9 CT |
4153 | if (conn->hcon->type == LE_LINK) |
4154 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4155 | else | |
4156 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4157 | |
4158 | if (err) { | |
e2fd318e | 4159 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4160 | |
4161 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4162 | |
4163 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 4164 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4165 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4166 | } | |
4167 | ||
88219a0f AV |
4168 | data += cmd_len; |
4169 | len -= cmd_len; | |
1da177e4 LT |
4170 | } |
4171 | ||
4172 | kfree_skb(skb); | |
4173 | } | |
4174 | ||
47d1ec61 | 4175 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4176 | { |
4177 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4178 | int hdr_size; |
4179 | ||
4180 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4181 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4182 | else | |
4183 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4184 | |
47d1ec61 | 4185 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4186 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4187 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4188 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4189 | ||
4190 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4191 | return -EBADMSG; |
fcc203c3 GP |
4192 | } |
4193 | return 0; | |
4194 | } | |
4195 | ||
525cd185 | 4196 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4197 | { |
88843ab0 | 4198 | u32 control = 0; |
d5392c8f | 4199 | |
6a026610 | 4200 | chan->frames_sent = 0; |
d5392c8f | 4201 | |
0b209fae | 4202 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 4203 | |
e2ab4353 | 4204 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 4205 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 4206 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
4207 | } |
4208 | ||
e2ab4353 | 4209 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 4210 | l2cap_retransmit_frames(chan); |
d5392c8f | 4211 | |
525cd185 | 4212 | l2cap_ertm_send(chan); |
d5392c8f | 4213 | |
e2ab4353 | 4214 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 4215 | chan->frames_sent == 0) { |
ab784b73 | 4216 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
d5392c8f GP |
4217 | } |
4218 | } | |
4219 | ||
84084a31 MM |
4220 | static void append_skb_frag(struct sk_buff *skb, |
4221 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4222 | { |
84084a31 MM |
4223 | /* skb->len reflects data in skb as well as all fragments |
4224 | * skb->data_len reflects only data in fragments | |
4225 | */ | |
4226 | if (!skb_has_frag_list(skb)) | |
4227 | skb_shinfo(skb)->frag_list = new_frag; | |
4228 | ||
4229 | new_frag->next = NULL; | |
4230 | ||
4231 | (*last_frag)->next = new_frag; | |
4232 | *last_frag = new_frag; | |
4233 | ||
4234 | skb->len += new_frag->len; | |
4235 | skb->data_len += new_frag->len; | |
4236 | skb->truesize += new_frag->truesize; | |
4237 | } | |
4238 | ||
4b51dae9 MM |
4239 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4240 | struct l2cap_ctrl *control) | |
84084a31 MM |
4241 | { |
4242 | int err = -EINVAL; | |
18778a63 | 4243 | |
4b51dae9 | 4244 | switch (control->sar) { |
7e0ef6ee | 4245 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4246 | if (chan->sdu) |
4247 | break; | |
18778a63 | 4248 | |
84084a31 MM |
4249 | err = chan->ops->recv(chan->data, skb); |
4250 | break; | |
18778a63 | 4251 | |
7e0ef6ee | 4252 | case L2CAP_SAR_START: |
84084a31 MM |
4253 | if (chan->sdu) |
4254 | break; | |
18778a63 | 4255 | |
6f61fd47 | 4256 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4257 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4258 | |
84084a31 MM |
4259 | if (chan->sdu_len > chan->imtu) { |
4260 | err = -EMSGSIZE; | |
4261 | break; | |
4262 | } | |
1890d36b | 4263 | |
84084a31 MM |
4264 | if (skb->len >= chan->sdu_len) |
4265 | break; | |
18778a63 | 4266 | |
84084a31 MM |
4267 | chan->sdu = skb; |
4268 | chan->sdu_last_frag = skb; | |
18778a63 | 4269 | |
84084a31 MM |
4270 | skb = NULL; |
4271 | err = 0; | |
18778a63 GP |
4272 | break; |
4273 | ||
7e0ef6ee | 4274 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4275 | if (!chan->sdu) |
84084a31 | 4276 | break; |
18778a63 | 4277 | |
84084a31 MM |
4278 | append_skb_frag(chan->sdu, skb, |
4279 | &chan->sdu_last_frag); | |
4280 | skb = NULL; | |
18778a63 | 4281 | |
84084a31 MM |
4282 | if (chan->sdu->len >= chan->sdu_len) |
4283 | break; | |
4178ba46 | 4284 | |
84084a31 | 4285 | err = 0; |
18778a63 GP |
4286 | break; |
4287 | ||
7e0ef6ee | 4288 | case L2CAP_SAR_END: |
6f61fd47 | 4289 | if (!chan->sdu) |
84084a31 | 4290 | break; |
18778a63 | 4291 | |
84084a31 MM |
4292 | append_skb_frag(chan->sdu, skb, |
4293 | &chan->sdu_last_frag); | |
4294 | skb = NULL; | |
4178ba46 | 4295 | |
84084a31 MM |
4296 | if (chan->sdu->len != chan->sdu_len) |
4297 | break; | |
18778a63 | 4298 | |
84084a31 | 4299 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4300 | |
84084a31 MM |
4301 | if (!err) { |
4302 | /* Reassembly complete */ | |
4303 | chan->sdu = NULL; | |
4304 | chan->sdu_last_frag = NULL; | |
4305 | chan->sdu_len = 0; | |
1890d36b | 4306 | } |
18778a63 GP |
4307 | break; |
4308 | } | |
4309 | ||
84084a31 MM |
4310 | if (err) { |
4311 | kfree_skb(skb); | |
4312 | kfree_skb(chan->sdu); | |
4313 | chan->sdu = NULL; | |
4314 | chan->sdu_last_frag = NULL; | |
4315 | chan->sdu_len = 0; | |
4316 | } | |
18778a63 | 4317 | |
84084a31 | 4318 | return err; |
18778a63 GP |
4319 | } |
4320 | ||
26f880d2 | 4321 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 4322 | { |
26f880d2 | 4323 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 4324 | |
26f880d2 | 4325 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3c588192 | 4326 | l2cap_seq_list_clear(&chan->srej_list); |
26f880d2 | 4327 | |
77f918bc | 4328 | __set_ack_timer(chan); |
26f880d2 MM |
4329 | } |
4330 | ||
4331 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
4332 | { | |
88843ab0 | 4333 | u32 control; |
712132eb | 4334 | |
e2ab4353 | 4335 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
4336 | goto done; |
4337 | ||
0b209fae | 4338 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 4339 | control |= __set_ctrl_poll(chan); |
ab784b73 | 4340 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
6a026610 | 4341 | chan->retry_count = 1; |
712132eb | 4342 | |
1a09bcb9 GP |
4343 | __clear_retrans_timer(chan); |
4344 | __set_monitor_timer(chan); | |
712132eb | 4345 | |
e2ab4353 | 4346 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
4347 | |
4348 | done: | |
e2ab4353 GP |
4349 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
4350 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 4351 | |
49208c9c | 4352 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
4353 | } |
4354 | ||
e328140f | 4355 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 4356 | { |
e328140f MM |
4357 | if (chan->mode == L2CAP_MODE_ERTM) { |
4358 | if (busy) | |
4359 | l2cap_ertm_enter_local_busy(chan); | |
4360 | else | |
4361 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 4362 | } |
1890d36b GP |
4363 | } |
4364 | ||
4b51dae9 MM |
4365 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4366 | { | |
4367 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4368 | ||
4369 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4370 | chan->expected_tx_seq); | |
4371 | ||
4372 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4373 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4374 | chan->tx_win) { | |
4375 | /* See notes below regarding "double poll" and | |
4376 | * invalid packets. | |
4377 | */ | |
4378 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4379 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4380 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4381 | } else { | |
4382 | BT_DBG("Invalid - in window after SREJ sent"); | |
4383 | return L2CAP_TXSEQ_INVALID; | |
4384 | } | |
4385 | } | |
4386 | ||
4387 | if (chan->srej_list.head == txseq) { | |
4388 | BT_DBG("Expected SREJ"); | |
4389 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4390 | } | |
4391 | ||
4392 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4393 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4394 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4395 | } | |
4396 | ||
4397 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4398 | BT_DBG("Unexpected SREJ - not requested"); | |
4399 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4400 | } | |
4401 | } | |
4402 | ||
4403 | if (chan->expected_tx_seq == txseq) { | |
4404 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4405 | chan->tx_win) { | |
4406 | BT_DBG("Invalid - txseq outside tx window"); | |
4407 | return L2CAP_TXSEQ_INVALID; | |
4408 | } else { | |
4409 | BT_DBG("Expected"); | |
4410 | return L2CAP_TXSEQ_EXPECTED; | |
4411 | } | |
4412 | } | |
4413 | ||
4414 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4415 | __seq_offset(chan, chan->expected_tx_seq, | |
4416 | chan->last_acked_seq)){ | |
4417 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4418 | return L2CAP_TXSEQ_DUPLICATE; | |
4419 | } | |
4420 | ||
4421 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4422 | /* A source of invalid packets is a "double poll" condition, | |
4423 | * where delays cause us to send multiple poll packets. If | |
4424 | * the remote stack receives and processes both polls, | |
4425 | * sequence numbers can wrap around in such a way that a | |
4426 | * resent frame has a sequence number that looks like new data | |
4427 | * with a sequence gap. This would trigger an erroneous SREJ | |
4428 | * request. | |
4429 | * | |
4430 | * Fortunately, this is impossible with a tx window that's | |
4431 | * less than half of the maximum sequence number, which allows | |
4432 | * invalid frames to be safely ignored. | |
4433 | * | |
4434 | * With tx window sizes greater than half of the tx window | |
4435 | * maximum, the frame is invalid and cannot be ignored. This | |
4436 | * causes a disconnect. | |
4437 | */ | |
4438 | ||
4439 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4440 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4441 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4442 | } else { | |
4443 | BT_DBG("Invalid - txseq outside tx window"); | |
4444 | return L2CAP_TXSEQ_INVALID; | |
4445 | } | |
4446 | } else { | |
4447 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4448 | return L2CAP_TXSEQ_UNEXPECTED; | |
4449 | } | |
4450 | } | |
4451 | ||
cec8ab6e MM |
4452 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4453 | struct sk_buff *skb, u8 event) | |
218bb9df | 4454 | { |
cec8ab6e MM |
4455 | /* Placeholder */ |
4456 | return -ENOTSUPP; | |
4457 | } | |
4458 | ||
4459 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
4460 | struct sk_buff *skb) | |
4461 | { | |
4b51dae9 MM |
4462 | int err = 0; |
4463 | ||
4464 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
4465 | chan->rx_state); | |
4466 | ||
4467 | if (l2cap_classify_txseq(chan, control->txseq) == | |
4468 | L2CAP_TXSEQ_EXPECTED) { | |
4469 | l2cap_pass_to_tx(chan, control); | |
4470 | ||
4471 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
4472 | __next_seq(chan, chan->buffer_seq)); | |
4473 | ||
4474 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4475 | ||
4476 | l2cap_reassemble_sdu(chan, skb, control); | |
4477 | } else { | |
4478 | if (chan->sdu) { | |
4479 | kfree_skb(chan->sdu); | |
4480 | chan->sdu = NULL; | |
4481 | } | |
4482 | chan->sdu_last_frag = NULL; | |
4483 | chan->sdu_len = 0; | |
4484 | ||
4485 | if (skb) { | |
4486 | BT_DBG("Freeing %p", skb); | |
4487 | kfree_skb(skb); | |
4488 | } | |
4489 | } | |
4490 | ||
4491 | chan->last_acked_seq = control->txseq; | |
4492 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
4493 | ||
4494 | return err; | |
cec8ab6e MM |
4495 | } |
4496 | ||
4497 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
4498 | { | |
4499 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
4500 | u16 len; | |
4501 | u8 event; | |
218bb9df | 4502 | |
b76bbd66 MM |
4503 | __unpack_control(chan, skb); |
4504 | ||
218bb9df GP |
4505 | len = skb->len; |
4506 | ||
4507 | /* | |
4508 | * We can just drop the corrupted I-frame here. | |
4509 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 4510 | * procedures and ask for retransmission. |
218bb9df | 4511 | */ |
47d1ec61 | 4512 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4513 | goto drop; |
4514 | ||
cec8ab6e | 4515 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 4516 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4517 | |
47d1ec61 | 4518 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4519 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4520 | |
47d1ec61 | 4521 | if (len > chan->mps) { |
8c1d787b | 4522 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4523 | goto drop; |
4524 | } | |
4525 | ||
cec8ab6e MM |
4526 | if (!control->sframe) { |
4527 | int err; | |
218bb9df | 4528 | |
cec8ab6e MM |
4529 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
4530 | control->sar, control->reqseq, control->final, | |
4531 | control->txseq); | |
218bb9df | 4532 | |
cec8ab6e MM |
4533 | /* Validate F-bit - F=0 always valid, F=1 only |
4534 | * valid in TX WAIT_F | |
4535 | */ | |
4536 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 4537 | goto drop; |
cec8ab6e MM |
4538 | |
4539 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
4540 | event = L2CAP_EV_RECV_IFRAME; | |
4541 | err = l2cap_rx(chan, control, skb, event); | |
4542 | } else { | |
4543 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
4544 | } |
4545 | ||
cec8ab6e MM |
4546 | if (err) |
4547 | l2cap_send_disconn_req(chan->conn, chan, | |
4548 | ECONNRESET); | |
218bb9df | 4549 | } else { |
cec8ab6e MM |
4550 | const u8 rx_func_to_event[4] = { |
4551 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
4552 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
4553 | }; | |
4554 | ||
4555 | /* Only I-frames are expected in streaming mode */ | |
4556 | if (chan->mode == L2CAP_MODE_STREAMING) | |
4557 | goto drop; | |
4558 | ||
4559 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
4560 | control->reqseq, control->final, control->poll, | |
4561 | control->super); | |
4562 | ||
218bb9df GP |
4563 | if (len != 0) { |
4564 | BT_ERR("%d", len); | |
8c1d787b | 4565 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4566 | goto drop; |
4567 | } | |
4568 | ||
cec8ab6e MM |
4569 | /* Validate F and P bits */ |
4570 | if (control->final && (control->poll || | |
4571 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
4572 | goto drop; | |
4573 | ||
4574 | event = rx_func_to_event[control->super]; | |
4575 | if (l2cap_rx(chan, control, skb, event)) | |
4576 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
4577 | } |
4578 | ||
4579 | return 0; | |
4580 | ||
4581 | drop: | |
4582 | kfree_skb(skb); | |
4583 | return 0; | |
4584 | } | |
4585 | ||
1da177e4 LT |
4586 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4587 | { | |
48454079 | 4588 | struct l2cap_chan *chan; |
1da177e4 | 4589 | |
baa7e1fa | 4590 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4591 | if (!chan) { |
1da177e4 | 4592 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 4593 | /* Drop packet and return */ |
3379013b | 4594 | kfree_skb(skb); |
6be36555 | 4595 | return 0; |
1da177e4 LT |
4596 | } |
4597 | ||
49208c9c | 4598 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4599 | |
89bc500e | 4600 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4601 | goto drop; |
4602 | ||
0c1bc5c6 | 4603 | switch (chan->mode) { |
1c2acffb GP |
4604 | case L2CAP_MODE_BASIC: |
4605 | /* If socket recv buffers overflows we drop data here | |
4606 | * which is *bad* because L2CAP has to be reliable. | |
4607 | * But we don't have any other choice. L2CAP doesn't | |
4608 | * provide flow control mechanism. */ | |
1da177e4 | 4609 | |
0c1bc5c6 | 4610 | if (chan->imtu < skb->len) |
1c2acffb | 4611 | goto drop; |
1da177e4 | 4612 | |
23070494 | 4613 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4614 | goto done; |
4615 | break; | |
4616 | ||
4617 | case L2CAP_MODE_ERTM: | |
6840ed07 | 4618 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 4619 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
4620 | goto done; |
4621 | ||
1c2acffb | 4622 | default: |
0c1bc5c6 | 4623 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4624 | break; |
4625 | } | |
1da177e4 LT |
4626 | |
4627 | drop: | |
4628 | kfree_skb(skb); | |
4629 | ||
4630 | done: | |
6be36555 | 4631 | l2cap_chan_unlock(chan); |
0139418c | 4632 | |
1da177e4 LT |
4633 | return 0; |
4634 | } | |
4635 | ||
8e036fc3 | 4636 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4637 | { |
23691d75 | 4638 | struct l2cap_chan *chan; |
1da177e4 | 4639 | |
c2287681 | 4640 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 4641 | if (!chan) |
1da177e4 LT |
4642 | goto drop; |
4643 | ||
5b4cedaa | 4644 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4645 | |
89bc500e | 4646 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4647 | goto drop; |
4648 | ||
e13e21dc | 4649 | if (chan->imtu < skb->len) |
1da177e4 LT |
4650 | goto drop; |
4651 | ||
23070494 | 4652 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4653 | return 0; |
1da177e4 LT |
4654 | |
4655 | drop: | |
4656 | kfree_skb(skb); | |
4657 | ||
1da177e4 LT |
4658 | return 0; |
4659 | } | |
4660 | ||
d9b88702 AE |
4661 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
4662 | struct sk_buff *skb) | |
9f69bda6 | 4663 | { |
23691d75 | 4664 | struct l2cap_chan *chan; |
9f69bda6 | 4665 | |
c2287681 | 4666 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 4667 | if (!chan) |
9f69bda6 GP |
4668 | goto drop; |
4669 | ||
5b4cedaa | 4670 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 4671 | |
89bc500e | 4672 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4673 | goto drop; |
4674 | ||
e13e21dc | 4675 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4676 | goto drop; |
4677 | ||
23070494 | 4678 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4679 | return 0; |
9f69bda6 GP |
4680 | |
4681 | drop: | |
4682 | kfree_skb(skb); | |
4683 | ||
9f69bda6 GP |
4684 | return 0; |
4685 | } | |
4686 | ||
1da177e4 LT |
4687 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4688 | { | |
4689 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4690 | u16 cid, len; |
4691 | __le16 psm; | |
1da177e4 LT |
4692 | |
4693 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4694 | cid = __le16_to_cpu(lh->cid); | |
4695 | len = __le16_to_cpu(lh->len); | |
4696 | ||
1c2acffb GP |
4697 | if (len != skb->len) { |
4698 | kfree_skb(skb); | |
4699 | return; | |
4700 | } | |
4701 | ||
1da177e4 LT |
4702 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4703 | ||
4704 | switch (cid) { | |
3300d9a9 | 4705 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4706 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4707 | l2cap_sig_channel(conn, skb); |
4708 | break; | |
4709 | ||
8db4dc46 | 4710 | case L2CAP_CID_CONN_LESS: |
097db76c | 4711 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
4712 | skb_pull(skb, 2); |
4713 | l2cap_conless_channel(conn, psm, skb); | |
4714 | break; | |
4715 | ||
9f69bda6 GP |
4716 | case L2CAP_CID_LE_DATA: |
4717 | l2cap_att_channel(conn, cid, skb); | |
4718 | break; | |
4719 | ||
b501d6a1 AB |
4720 | case L2CAP_CID_SMP: |
4721 | if (smp_sig_channel(conn, skb)) | |
4722 | l2cap_conn_del(conn->hcon, EACCES); | |
4723 | break; | |
4724 | ||
1da177e4 LT |
4725 | default: |
4726 | l2cap_data_channel(conn, cid, skb); | |
4727 | break; | |
4728 | } | |
4729 | } | |
4730 | ||
4731 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4732 | ||
686ebf28 | 4733 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
4734 | { |
4735 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4736 | struct l2cap_chan *c; |
1da177e4 | 4737 | |
1da177e4 LT |
4738 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
4739 | ||
4740 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4741 | read_lock(&chan_list_lock); |
4742 | list_for_each_entry(c, &chan_list, global_l) { | |
4743 | struct sock *sk = c->sk; | |
4343478f | 4744 | |
89bc500e | 4745 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4746 | continue; |
4747 | ||
4748 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4749 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4750 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4751 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4752 | exact++; |
2af6b9d5 MH |
4753 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4754 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4755 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4756 | lm2 |= HCI_LM_MASTER; |
4757 | } | |
1da177e4 | 4758 | } |
23691d75 | 4759 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4760 | |
4761 | return exact ? lm1 : lm2; | |
4762 | } | |
4763 | ||
686ebf28 | 4764 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 4765 | { |
0139418c MH |
4766 | struct l2cap_conn *conn; |
4767 | ||
1da177e4 LT |
4768 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4769 | ||
1da177e4 | 4770 | if (!status) { |
1da177e4 LT |
4771 | conn = l2cap_conn_add(hcon, status); |
4772 | if (conn) | |
4773 | l2cap_conn_ready(conn); | |
0139418c | 4774 | } else |
e175072f | 4775 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4776 | |
4777 | return 0; | |
4778 | } | |
4779 | ||
686ebf28 | 4780 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
4781 | { |
4782 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4783 | ||
4784 | BT_DBG("hcon %p", hcon); | |
4785 | ||
686ebf28 | 4786 | if (!conn) |
9f5a0d7b | 4787 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4788 | return conn->disc_reason; |
4789 | } | |
4790 | ||
686ebf28 | 4791 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
4792 | { |
4793 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4794 | ||
e175072f | 4795 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
4796 | return 0; |
4797 | } | |
4798 | ||
4343478f | 4799 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4800 | { |
715ec005 | 4801 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4802 | return; |
4803 | ||
f62e4323 | 4804 | if (encrypt == 0x00) { |
4343478f | 4805 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 4806 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4807 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4808 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4809 | } else { |
4343478f | 4810 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4811 | __clear_chan_timer(chan); |
f62e4323 MH |
4812 | } |
4813 | } | |
4814 | ||
686ebf28 | 4815 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4816 | { |
0139418c | 4817 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4818 | struct l2cap_chan *chan; |
1da177e4 | 4819 | |
0139418c | 4820 | if (!conn) |
1da177e4 | 4821 | return 0; |
0139418c | 4822 | |
1da177e4 LT |
4823 | BT_DBG("conn %p", conn); |
4824 | ||
160dc6ac | 4825 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
4826 | if (!status && encrypt) |
4827 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 4828 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
4829 | } |
4830 | ||
3df91ea2 | 4831 | mutex_lock(&conn->chan_lock); |
1da177e4 | 4832 | |
3df91ea2 | 4833 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 4834 | l2cap_chan_lock(chan); |
1da177e4 | 4835 | |
f1cb9af5 VCG |
4836 | BT_DBG("chan->scid %d", chan->scid); |
4837 | ||
4838 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4839 | if (!status && encrypt) { | |
4840 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 4841 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
4842 | } |
4843 | ||
6be36555 | 4844 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
4845 | continue; |
4846 | } | |
4847 | ||
c1360a1c | 4848 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 4849 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
4850 | continue; |
4851 | } | |
4852 | ||
89bc500e GP |
4853 | if (!status && (chan->state == BT_CONNECTED || |
4854 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
4855 | struct sock *sk = chan->sk; |
4856 | ||
c5daa683 | 4857 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
4858 | sk->sk_state_change(sk); |
4859 | ||
4343478f | 4860 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 4861 | l2cap_chan_unlock(chan); |
9719f8af MH |
4862 | continue; |
4863 | } | |
4864 | ||
89bc500e | 4865 | if (chan->state == BT_CONNECT) { |
b1235d79 | 4866 | if (!status) { |
9b27f350 | 4867 | l2cap_send_conn_req(chan); |
b1235d79 | 4868 | } else { |
ba13ccd9 | 4869 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4870 | } |
89bc500e | 4871 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 4872 | struct sock *sk = chan->sk; |
b1235d79 | 4873 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4874 | __u16 res, stat; |
1da177e4 | 4875 | |
6be36555 AE |
4876 | lock_sock(sk); |
4877 | ||
b1235d79 | 4878 | if (!status) { |
c5daa683 GP |
4879 | if (test_bit(BT_SK_DEFER_SETUP, |
4880 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
4881 | struct sock *parent = bt_sk(sk)->parent; |
4882 | res = L2CAP_CR_PEND; | |
4883 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4884 | if (parent) |
4885 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4886 | } else { |
0e587be7 | 4887 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4888 | res = L2CAP_CR_SUCCESS; |
4889 | stat = L2CAP_CS_NO_INFO; | |
4890 | } | |
b1235d79 | 4891 | } else { |
0e587be7 | 4892 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 4893 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4894 | res = L2CAP_CR_SEC_BLOCK; |
4895 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4896 | } |
4897 | ||
6be36555 AE |
4898 | release_sock(sk); |
4899 | ||
fe4128e0 GP |
4900 | rsp.scid = cpu_to_le16(chan->dcid); |
4901 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4902 | rsp.result = cpu_to_le16(res); |
4903 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4904 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4905 | sizeof(rsp), &rsp); | |
b1235d79 | 4906 | } |
1da177e4 | 4907 | |
6be36555 | 4908 | l2cap_chan_unlock(chan); |
1da177e4 LT |
4909 | } |
4910 | ||
3df91ea2 | 4911 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 4912 | |
1da177e4 LT |
4913 | return 0; |
4914 | } | |
4915 | ||
686ebf28 | 4916 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
4917 | { |
4918 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4919 | ||
5a08ecce AE |
4920 | if (!conn) |
4921 | conn = l2cap_conn_add(hcon, 0); | |
4922 | ||
4923 | if (!conn) | |
1da177e4 LT |
4924 | goto drop; |
4925 | ||
4926 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4927 | ||
e702112f | 4928 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
4929 | struct l2cap_hdr *hdr; |
4930 | int len; | |
4931 | ||
4932 | if (conn->rx_len) { | |
4933 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4934 | kfree_skb(conn->rx_skb); | |
4935 | conn->rx_skb = NULL; | |
4936 | conn->rx_len = 0; | |
4937 | l2cap_conn_unreliable(conn, ECOMM); | |
4938 | } | |
4939 | ||
aae7fe22 AE |
4940 | /* Start fragment always begin with Basic L2CAP header */ |
4941 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4942 | BT_ERR("Frame is too short (len %d)", skb->len); |
4943 | l2cap_conn_unreliable(conn, ECOMM); | |
4944 | goto drop; | |
4945 | } | |
4946 | ||
4947 | hdr = (struct l2cap_hdr *) skb->data; | |
4948 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4949 | ||
4950 | if (len == skb->len) { | |
4951 | /* Complete frame received */ | |
4952 | l2cap_recv_frame(conn, skb); | |
4953 | return 0; | |
4954 | } | |
4955 | ||
4956 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4957 | ||
4958 | if (skb->len > len) { | |
4959 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4960 | skb->len, len); | |
4961 | l2cap_conn_unreliable(conn, ECOMM); | |
4962 | goto drop; | |
4963 | } | |
4964 | ||
4965 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4966 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4967 | if (!conn->rx_skb) | |
1da177e4 LT |
4968 | goto drop; |
4969 | ||
d626f62b | 4970 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4971 | skb->len); |
1da177e4 LT |
4972 | conn->rx_len = len - skb->len; |
4973 | } else { | |
4974 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4975 | ||
4976 | if (!conn->rx_len) { | |
4977 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4978 | l2cap_conn_unreliable(conn, ECOMM); | |
4979 | goto drop; | |
4980 | } | |
4981 | ||
4982 | if (skb->len > conn->rx_len) { | |
4983 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4984 | skb->len, conn->rx_len); | |
4985 | kfree_skb(conn->rx_skb); | |
4986 | conn->rx_skb = NULL; | |
4987 | conn->rx_len = 0; | |
4988 | l2cap_conn_unreliable(conn, ECOMM); | |
4989 | goto drop; | |
4990 | } | |
4991 | ||
d626f62b | 4992 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4993 | skb->len); |
1da177e4 LT |
4994 | conn->rx_len -= skb->len; |
4995 | ||
4996 | if (!conn->rx_len) { | |
4997 | /* Complete frame received */ | |
4998 | l2cap_recv_frame(conn, conn->rx_skb); | |
4999 | conn->rx_skb = NULL; | |
5000 | } | |
5001 | } | |
5002 | ||
5003 | drop: | |
5004 | kfree_skb(skb); | |
5005 | return 0; | |
5006 | } | |
5007 | ||
aef7d97c | 5008 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5009 | { |
23691d75 | 5010 | struct l2cap_chan *c; |
1da177e4 | 5011 | |
333055f2 | 5012 | read_lock(&chan_list_lock); |
1da177e4 | 5013 | |
23691d75 GP |
5014 | list_for_each_entry(c, &chan_list, global_l) { |
5015 | struct sock *sk = c->sk; | |
101545f6 | 5016 | |
903d343e | 5017 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5018 | batostr(&bt_sk(sk)->src), |
5019 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5020 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5021 | c->scid, c->dcid, c->imtu, c->omtu, |
5022 | c->sec_level, c->mode); | |
61e1b4b7 | 5023 | } |
1da177e4 | 5024 | |
333055f2 | 5025 | read_unlock(&chan_list_lock); |
1da177e4 | 5026 | |
aef7d97c | 5027 | return 0; |
1da177e4 LT |
5028 | } |
5029 | ||
aef7d97c MH |
5030 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5031 | { | |
5032 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5033 | } | |
5034 | ||
5035 | static const struct file_operations l2cap_debugfs_fops = { | |
5036 | .open = l2cap_debugfs_open, | |
5037 | .read = seq_read, | |
5038 | .llseek = seq_lseek, | |
5039 | .release = single_release, | |
5040 | }; | |
5041 | ||
5042 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5043 | |
64274518 | 5044 | int __init l2cap_init(void) |
1da177e4 LT |
5045 | { |
5046 | int err; | |
be9d1227 | 5047 | |
bb58f747 | 5048 | err = l2cap_init_sockets(); |
1da177e4 LT |
5049 | if (err < 0) |
5050 | return err; | |
5051 | ||
aef7d97c MH |
5052 | if (bt_debugfs) { |
5053 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5054 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5055 | if (!l2cap_debugfs) | |
5056 | BT_ERR("Failed to create L2CAP debug file"); | |
5057 | } | |
1da177e4 | 5058 | |
1da177e4 | 5059 | return 0; |
1da177e4 LT |
5060 | } |
5061 | ||
64274518 | 5062 | void l2cap_exit(void) |
1da177e4 | 5063 | { |
aef7d97c | 5064 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5065 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5066 | } |
5067 | ||
d1c4a17d GP |
5068 | module_param(disable_ertm, bool, 0644); |
5069 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |