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. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
57 | ||
bb58f747 | 58 | int disable_ertm; |
f0709e03 | 59 | |
47ec1dcd | 60 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 61 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 62 | |
1890d36b GP |
63 | static struct workqueue_struct *_busy_wq; |
64 | ||
23691d75 GP |
65 | LIST_HEAD(chan_list); |
66 | DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1890d36b GP |
68 | static void l2cap_busy_work(struct work_struct *work); |
69 | ||
1da177e4 LT |
70 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
71 | u8 code, u8 ident, u16 dlen, void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
1da177e4 | 73 | |
218bb9df GP |
74 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
75 | ||
0139418c | 76 | /* ---- L2CAP channels ---- */ |
baa7e1fa | 77 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 78 | { |
48454079 | 79 | struct l2cap_chan *c; |
baa7e1fa GP |
80 | |
81 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 82 | if (c->dcid == cid) |
baa7e1fa | 83 | return c; |
0139418c | 84 | } |
baa7e1fa GP |
85 | return NULL; |
86 | ||
0139418c MH |
87 | } |
88 | ||
baa7e1fa | 89 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 90 | { |
48454079 | 91 | struct l2cap_chan *c; |
baa7e1fa GP |
92 | |
93 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 94 | if (c->scid == cid) |
baa7e1fa | 95 | return c; |
0139418c | 96 | } |
baa7e1fa | 97 | return NULL; |
0139418c MH |
98 | } |
99 | ||
100 | /* Find channel with given SCID. | |
101 | * Returns locked socket */ | |
baa7e1fa | 102 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 103 | { |
48454079 | 104 | struct l2cap_chan *c; |
baa7e1fa GP |
105 | |
106 | read_lock(&conn->chan_lock); | |
107 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
108 | if (c) |
109 | bh_lock_sock(c->sk); | |
baa7e1fa | 110 | read_unlock(&conn->chan_lock); |
48454079 | 111 | return c; |
0139418c MH |
112 | } |
113 | ||
baa7e1fa | 114 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 115 | { |
48454079 | 116 | struct l2cap_chan *c; |
baa7e1fa GP |
117 | |
118 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 119 | if (c->ident == ident) |
baa7e1fa | 120 | return c; |
0139418c | 121 | } |
baa7e1fa | 122 | return NULL; |
0139418c MH |
123 | } |
124 | ||
baa7e1fa | 125 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 126 | { |
48454079 | 127 | struct l2cap_chan *c; |
baa7e1fa GP |
128 | |
129 | read_lock(&conn->chan_lock); | |
130 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
131 | if (c) |
132 | bh_lock_sock(c->sk); | |
baa7e1fa | 133 | read_unlock(&conn->chan_lock); |
48454079 | 134 | return c; |
0139418c MH |
135 | } |
136 | ||
23691d75 | 137 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 138 | { |
23691d75 | 139 | struct l2cap_chan *c; |
9e4425ff | 140 | |
23691d75 GP |
141 | list_for_each_entry(c, &chan_list, global_l) { |
142 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
9e4425ff GP |
143 | goto found; |
144 | } | |
145 | ||
23691d75 | 146 | c = NULL; |
9e4425ff | 147 | found: |
23691d75 | 148 | return c; |
9e4425ff GP |
149 | } |
150 | ||
151 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
152 | { | |
73b2ec18 GP |
153 | int err; |
154 | ||
23691d75 | 155 | write_lock_bh(&chan_list_lock); |
9e4425ff | 156 | |
23691d75 | 157 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
158 | err = -EADDRINUSE; |
159 | goto done; | |
9e4425ff GP |
160 | } |
161 | ||
73b2ec18 GP |
162 | if (psm) { |
163 | chan->psm = psm; | |
164 | chan->sport = psm; | |
165 | err = 0; | |
166 | } else { | |
167 | u16 p; | |
168 | ||
169 | err = -EINVAL; | |
170 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 171 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
172 | chan->psm = cpu_to_le16(p); |
173 | chan->sport = cpu_to_le16(p); | |
174 | err = 0; | |
175 | break; | |
176 | } | |
177 | } | |
9e4425ff | 178 | |
73b2ec18 | 179 | done: |
23691d75 | 180 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 181 | return err; |
9e4425ff GP |
182 | } |
183 | ||
184 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
185 | { | |
23691d75 | 186 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
187 | |
188 | chan->scid = scid; | |
189 | ||
23691d75 | 190 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
baa7e1fa | 195 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 196 | { |
8db4dc46 | 197 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 198 | |
8db4dc46 | 199 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 200 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
201 | return cid; |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
23691d75 | 207 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
208 | { |
209 | struct l2cap_chan *chan; | |
210 | ||
211 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
212 | if (!chan) | |
213 | return NULL; | |
214 | ||
215 | chan->sk = sk; | |
216 | ||
23691d75 GP |
217 | write_lock_bh(&chan_list_lock); |
218 | list_add(&chan->global_l, &chan_list); | |
219 | write_unlock_bh(&chan_list_lock); | |
220 | ||
48454079 GP |
221 | return chan; |
222 | } | |
223 | ||
23691d75 | 224 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 225 | { |
23691d75 GP |
226 | write_lock_bh(&chan_list_lock); |
227 | list_del(&chan->global_l); | |
228 | write_unlock_bh(&chan_list_lock); | |
229 | ||
6ff5abbf GP |
230 | kfree(chan); |
231 | } | |
232 | ||
48454079 | 233 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 234 | { |
48454079 | 235 | struct sock *sk = chan->sk; |
0139418c | 236 | |
af05b30b | 237 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 238 | chan->psm, chan->dcid); |
0139418c | 239 | |
2950f21a MH |
240 | conn->disc_reason = 0x13; |
241 | ||
8c1d787b | 242 | chan->conn = conn; |
0139418c | 243 | |
bd3c9e25 | 244 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
b62f328b VT |
245 | if (conn->hcon->type == LE_LINK) { |
246 | /* LE connection */ | |
0c1bc5c6 | 247 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
248 | chan->scid = L2CAP_CID_LE_DATA; |
249 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
250 | } else { |
251 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 252 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 253 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 254 | } |
0139418c MH |
255 | } else if (sk->sk_type == SOCK_DGRAM) { |
256 | /* Connectionless socket */ | |
fe4128e0 GP |
257 | chan->scid = L2CAP_CID_CONN_LESS; |
258 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 259 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
260 | } else { |
261 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
262 | chan->scid = L2CAP_CID_SIGNALING; |
263 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 264 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
265 | } |
266 | ||
baa7e1fa GP |
267 | sock_hold(sk); |
268 | ||
269 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
270 | } |
271 | ||
8e87d142 | 272 | /* Delete channel. |
0139418c | 273 | * Must be called on the locked socket. */ |
48454079 | 274 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 275 | { |
48454079 | 276 | struct sock *sk = chan->sk; |
8c1d787b | 277 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
278 | struct sock *parent = bt_sk(sk)->parent; |
279 | ||
280 | l2cap_sock_clear_timer(sk); | |
281 | ||
49208c9c | 282 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 283 | |
8e87d142 | 284 | if (conn) { |
baa7e1fa GP |
285 | /* Delete from channel list */ |
286 | write_lock_bh(&conn->chan_lock); | |
287 | list_del(&chan->list); | |
288 | write_unlock_bh(&conn->chan_lock); | |
289 | __sock_put(sk); | |
290 | ||
8c1d787b | 291 | chan->conn = NULL; |
0139418c MH |
292 | hci_conn_put(conn->hcon); |
293 | } | |
294 | ||
b1235d79 | 295 | sk->sk_state = BT_CLOSED; |
0139418c MH |
296 | sock_set_flag(sk, SOCK_ZAPPED); |
297 | ||
298 | if (err) | |
299 | sk->sk_err = err; | |
300 | ||
301 | if (parent) { | |
302 | bt_accept_unlink(sk); | |
303 | parent->sk_data_ready(parent, 0); | |
304 | } else | |
305 | sk->sk_state_change(sk); | |
c13ffa62 | 306 | |
b4450035 GP |
307 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && |
308 | chan->conf_state & L2CAP_CONF_INPUT_DONE)) | |
6ff5abbf | 309 | return; |
2ead70b8 | 310 | |
58d35f87 | 311 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 312 | |
0c1bc5c6 | 313 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
314 | struct srej_list *l, *tmp; |
315 | ||
e92c8e70 GP |
316 | del_timer(&chan->retrans_timer); |
317 | del_timer(&chan->monitor_timer); | |
318 | del_timer(&chan->ack_timer); | |
c13ffa62 | 319 | |
f1c6775b GP |
320 | skb_queue_purge(&chan->srej_q); |
321 | skb_queue_purge(&chan->busy_q); | |
c13ffa62 | 322 | |
39d5a3ee | 323 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
324 | list_del(&l->list); |
325 | kfree(l); | |
326 | } | |
327 | } | |
0139418c MH |
328 | } |
329 | ||
4343478f | 330 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 331 | { |
4343478f GP |
332 | struct sock *sk = chan->sk; |
333 | ||
8556edd3 | 334 | if (sk->sk_type == SOCK_RAW) { |
4343478f | 335 | switch (chan->sec_level) { |
8556edd3 JH |
336 | case BT_SECURITY_HIGH: |
337 | return HCI_AT_DEDICATED_BONDING_MITM; | |
338 | case BT_SECURITY_MEDIUM: | |
339 | return HCI_AT_DEDICATED_BONDING; | |
340 | default: | |
341 | return HCI_AT_NO_BONDING; | |
342 | } | |
fe4128e0 | 343 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
344 | if (chan->sec_level == BT_SECURITY_LOW) |
345 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 346 | |
4343478f | 347 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 348 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 349 | else |
8556edd3 | 350 | return HCI_AT_NO_BONDING; |
00ae4af9 | 351 | } else { |
4343478f | 352 | switch (chan->sec_level) { |
00ae4af9 | 353 | case BT_SECURITY_HIGH: |
8556edd3 | 354 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 355 | case BT_SECURITY_MEDIUM: |
8556edd3 | 356 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 357 | default: |
8556edd3 | 358 | return HCI_AT_NO_BONDING; |
00ae4af9 | 359 | } |
0684e5f9 | 360 | } |
8556edd3 JH |
361 | } |
362 | ||
363 | /* Service level security */ | |
4343478f | 364 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 365 | { |
8c1d787b | 366 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
367 | __u8 auth_type; |
368 | ||
4343478f | 369 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 370 | |
4343478f | 371 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
372 | } |
373 | ||
68983259 | 374 | u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
375 | { |
376 | u8 id; | |
377 | ||
378 | /* Get next available identificator. | |
379 | * 1 - 128 are used by kernel. | |
380 | * 129 - 199 are reserved. | |
381 | * 200 - 254 are used by utilities like l2ping, etc. | |
382 | */ | |
383 | ||
384 | spin_lock_bh(&conn->lock); | |
385 | ||
386 | if (++conn->tx_ident > 128) | |
387 | conn->tx_ident = 1; | |
388 | ||
389 | id = conn->tx_ident; | |
390 | ||
391 | spin_unlock_bh(&conn->lock); | |
392 | ||
393 | return id; | |
394 | } | |
395 | ||
68983259 | 396 | void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
397 | { |
398 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 399 | u8 flags; |
4e8402a3 MH |
400 | |
401 | BT_DBG("code 0x%2.2x", code); | |
402 | ||
403 | if (!skb) | |
9a9c6a34 | 404 | return; |
4e8402a3 | 405 | |
e702112f AE |
406 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
407 | flags = ACL_START_NO_FLUSH; | |
408 | else | |
409 | flags = ACL_START; | |
410 | ||
411 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
412 | } |
413 | ||
525cd185 | 414 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
415 | { |
416 | struct sk_buff *skb; | |
417 | struct l2cap_hdr *lh; | |
525cd185 | 418 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
8c1d787b | 419 | struct l2cap_conn *conn = chan->conn; |
c13ffa62 | 420 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 421 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 422 | u8 flags; |
fcc203c3 | 423 | |
c13ffa62 GP |
424 | if (sk->sk_state != BT_CONNECTED) |
425 | return; | |
426 | ||
47d1ec61 | 427 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 | 428 | hlen += 2; |
1c2acffb | 429 | |
49208c9c | 430 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 431 | |
fcc203c3 | 432 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
433 | control |= L2CAP_CTRL_FRAME_TYPE; |
434 | ||
525cd185 | 435 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
9e917af1 | 436 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 437 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
9e917af1 GP |
438 | } |
439 | ||
525cd185 | 440 | if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { |
f0946ccf | 441 | control |= L2CAP_CTRL_POLL; |
525cd185 | 442 | chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; |
f0946ccf GP |
443 | } |
444 | ||
1c2acffb GP |
445 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
446 | if (!skb) | |
9a9c6a34 | 447 | return; |
1c2acffb GP |
448 | |
449 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 450 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 451 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
452 | put_unaligned_le16(control, skb_put(skb, 2)); |
453 | ||
47d1ec61 | 454 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
455 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
456 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
457 | } | |
458 | ||
e702112f AE |
459 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
460 | flags = ACL_START_NO_FLUSH; | |
461 | else | |
462 | flags = ACL_START; | |
463 | ||
8c1d787b | 464 | hci_send_acl(chan->conn->hcon, skb, flags); |
1c2acffb GP |
465 | } |
466 | ||
525cd185 | 467 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 468 | { |
525cd185 | 469 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 470 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 471 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 472 | } else |
7e743090 GP |
473 | control |= L2CAP_SUPER_RCV_READY; |
474 | ||
42e5c802 | 475 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
2ab25cdd | 476 | |
525cd185 | 477 | l2cap_send_sframe(chan, control); |
7e743090 GP |
478 | } |
479 | ||
b4450035 | 480 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 481 | { |
b4450035 | 482 | return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); |
e501d055 AE |
483 | } |
484 | ||
fc7f8a7e | 485 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 486 | { |
8c1d787b | 487 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
488 | |
489 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
490 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
491 | return; | |
492 | ||
4343478f GP |
493 | if (l2cap_check_security(chan) && |
494 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 | 495 | struct l2cap_conn_req req; |
fe4128e0 GP |
496 | req.scid = cpu_to_le16(chan->scid); |
497 | req.psm = chan->psm; | |
79d554a6 | 498 | |
fc7f8a7e | 499 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 500 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 501 | |
fc7f8a7e GP |
502 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
503 | sizeof(req), &req); | |
b1235d79 | 504 | } |
79d554a6 MH |
505 | } else { |
506 | struct l2cap_info_req req; | |
507 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
508 | ||
509 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
510 | conn->info_ident = l2cap_get_ident(conn); | |
511 | ||
512 | mod_timer(&conn->info_timer, jiffies + | |
513 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
514 | ||
515 | l2cap_send_cmd(conn, conn->info_ident, | |
516 | L2CAP_INFO_REQ, sizeof(req), &req); | |
517 | } | |
518 | } | |
519 | ||
cf6c2c0b GP |
520 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
521 | { | |
522 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 523 | if (!disable_ertm) |
cf6c2c0b GP |
524 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
525 | ||
526 | switch (mode) { | |
527 | case L2CAP_MODE_ERTM: | |
528 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
529 | case L2CAP_MODE_STREAMING: | |
530 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
531 | default: | |
532 | return 0x00; | |
533 | } | |
534 | } | |
535 | ||
e92c8e70 | 536 | void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 537 | { |
e92c8e70 | 538 | struct sock *sk; |
22121fc9 GP |
539 | struct l2cap_disconn_req req; |
540 | ||
c13ffa62 GP |
541 | if (!conn) |
542 | return; | |
543 | ||
e92c8e70 GP |
544 | sk = chan->sk; |
545 | ||
0c1bc5c6 | 546 | if (chan->mode == L2CAP_MODE_ERTM) { |
e92c8e70 GP |
547 | del_timer(&chan->retrans_timer); |
548 | del_timer(&chan->monitor_timer); | |
549 | del_timer(&chan->ack_timer); | |
c13ffa62 GP |
550 | } |
551 | ||
fe4128e0 GP |
552 | req.dcid = cpu_to_le16(chan->dcid); |
553 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
554 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
555 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
556 | |
557 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 558 | sk->sk_err = err; |
22121fc9 GP |
559 | } |
560 | ||
1da177e4 | 561 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
562 | static void l2cap_conn_start(struct l2cap_conn *conn) |
563 | { | |
820ffdb3 | 564 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
565 | |
566 | BT_DBG("conn %p", conn); | |
567 | ||
baa7e1fa | 568 | read_lock(&conn->chan_lock); |
4e8402a3 | 569 | |
820ffdb3 | 570 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 571 | struct sock *sk = chan->sk; |
baa7e1fa | 572 | |
4e8402a3 MH |
573 | bh_lock_sock(sk); |
574 | ||
bd3c9e25 GP |
575 | if (sk->sk_type != SOCK_SEQPACKET && |
576 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
577 | bh_unlock_sock(sk); |
578 | continue; | |
579 | } | |
580 | ||
581 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 582 | struct l2cap_conn_req req; |
79d554a6 | 583 | |
4343478f | 584 | if (!l2cap_check_security(chan) || |
b4450035 | 585 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
586 | bh_unlock_sock(sk); |
587 | continue; | |
588 | } | |
79d554a6 | 589 | |
0c1bc5c6 | 590 | if (!l2cap_mode_supported(chan->mode, |
47731de7 | 591 | conn->feat_mask) |
b4450035 | 592 | && chan->conf_state & |
47731de7 | 593 | L2CAP_CONF_STATE2_DEVICE) { |
820ffdb3 GP |
594 | /* __l2cap_sock_close() calls list_del(chan) |
595 | * so release the lock */ | |
596 | read_unlock_bh(&conn->chan_lock); | |
597 | __l2cap_sock_close(sk, ECONNRESET); | |
598 | read_lock_bh(&conn->chan_lock); | |
47731de7 GP |
599 | bh_unlock_sock(sk); |
600 | continue; | |
b1235d79 | 601 | } |
47731de7 | 602 | |
fe4128e0 GP |
603 | req.scid = cpu_to_le16(chan->scid); |
604 | req.psm = chan->psm; | |
47731de7 | 605 | |
fc7f8a7e | 606 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 607 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
47731de7 | 608 | |
fc7f8a7e GP |
609 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
610 | sizeof(req), &req); | |
47731de7 | 611 | |
79d554a6 MH |
612 | } else if (sk->sk_state == BT_CONNECT2) { |
613 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 614 | char buf[128]; |
fe4128e0 GP |
615 | rsp.scid = cpu_to_le16(chan->dcid); |
616 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 617 | |
4343478f | 618 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
619 | if (bt_sk(sk)->defer_setup) { |
620 | struct sock *parent = bt_sk(sk)->parent; | |
621 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
622 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
623 | parent->sk_data_ready(parent, 0); | |
624 | ||
625 | } else { | |
626 | sk->sk_state = BT_CONFIG; | |
627 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
628 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
629 | } | |
79d554a6 MH |
630 | } else { |
631 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
632 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
633 | } | |
634 | ||
fc7f8a7e GP |
635 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
636 | sizeof(rsp), &rsp); | |
e9aeb2dd | 637 | |
b4450035 | 638 | if (chan->conf_state & L2CAP_CONF_REQ_SENT || |
e9aeb2dd GP |
639 | rsp.result != L2CAP_CR_SUCCESS) { |
640 | bh_unlock_sock(sk); | |
641 | continue; | |
642 | } | |
643 | ||
b4450035 | 644 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 645 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
646 | l2cap_build_conf_req(chan, buf), buf); |
647 | chan->num_conf_req++; | |
4e8402a3 MH |
648 | } |
649 | ||
650 | bh_unlock_sock(sk); | |
651 | } | |
652 | ||
baa7e1fa | 653 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
654 | } |
655 | ||
b62f328b VT |
656 | /* Find socket with cid and source bdaddr. |
657 | * Returns closest match, locked. | |
658 | */ | |
23691d75 | 659 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 660 | { |
23691d75 | 661 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 662 | |
23691d75 | 663 | read_lock(&chan_list_lock); |
b62f328b | 664 | |
23691d75 GP |
665 | list_for_each_entry(c, &chan_list, global_l) { |
666 | struct sock *sk = c->sk; | |
fe4128e0 | 667 | |
b62f328b VT |
668 | if (state && sk->sk_state != state) |
669 | continue; | |
670 | ||
23691d75 | 671 | if (c->scid == cid) { |
b62f328b | 672 | /* Exact match. */ |
23691d75 GP |
673 | if (!bacmp(&bt_sk(sk)->src, src)) { |
674 | read_unlock(&chan_list_lock); | |
675 | return c; | |
676 | } | |
b62f328b VT |
677 | |
678 | /* Closest match */ | |
679 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 680 | c1 = c; |
b62f328b VT |
681 | } |
682 | } | |
280f294f | 683 | |
23691d75 | 684 | read_unlock(&chan_list_lock); |
b62f328b | 685 | |
23691d75 | 686 | return c1; |
b62f328b VT |
687 | } |
688 | ||
689 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
690 | { | |
c916fbe4 | 691 | struct sock *parent, *sk; |
23691d75 | 692 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
693 | |
694 | BT_DBG(""); | |
695 | ||
696 | /* Check if we have socket listening on cid */ | |
23691d75 | 697 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 698 | conn->src); |
23691d75 | 699 | if (!pchan) |
b62f328b VT |
700 | return; |
701 | ||
23691d75 GP |
702 | parent = pchan->sk; |
703 | ||
62f3a2cf GP |
704 | bh_lock_sock(parent); |
705 | ||
b62f328b VT |
706 | /* Check for backlog size */ |
707 | if (sk_acceptq_is_full(parent)) { | |
708 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
709 | goto clean; | |
710 | } | |
711 | ||
712 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); | |
713 | if (!sk) | |
714 | goto clean; | |
715 | ||
23691d75 | 716 | chan = l2cap_chan_create(sk); |
48454079 GP |
717 | if (!chan) { |
718 | l2cap_sock_kill(sk); | |
719 | goto clean; | |
720 | } | |
721 | ||
5d41ce1d GP |
722 | l2cap_pi(sk)->chan = chan; |
723 | ||
baa7e1fa | 724 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
725 | |
726 | hci_conn_hold(conn->hcon); | |
727 | ||
728 | l2cap_sock_init(sk, parent); | |
baa7e1fa | 729 | |
b62f328b VT |
730 | bacpy(&bt_sk(sk)->src, conn->src); |
731 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
732 | ||
d1010240 GP |
733 | bt_accept_enqueue(parent, sk); |
734 | ||
48454079 GP |
735 | __l2cap_chan_add(conn, chan); |
736 | ||
b62f328b VT |
737 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
738 | ||
739 | sk->sk_state = BT_CONNECTED; | |
740 | parent->sk_data_ready(parent, 0); | |
741 | ||
baa7e1fa | 742 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
743 | |
744 | clean: | |
745 | bh_unlock_sock(parent); | |
746 | } | |
747 | ||
4e8402a3 MH |
748 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
749 | { | |
48454079 | 750 | struct l2cap_chan *chan; |
4e8402a3 | 751 | |
79d554a6 | 752 | BT_DBG("conn %p", conn); |
4e8402a3 | 753 | |
b62f328b VT |
754 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
755 | l2cap_le_conn_ready(conn); | |
756 | ||
baa7e1fa | 757 | read_lock(&conn->chan_lock); |
4e8402a3 | 758 | |
baa7e1fa | 759 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 760 | struct sock *sk = chan->sk; |
baa7e1fa | 761 | |
79d554a6 | 762 | bh_lock_sock(sk); |
4e8402a3 | 763 | |
acd7d370 VT |
764 | if (conn->hcon->type == LE_LINK) { |
765 | l2cap_sock_clear_timer(sk); | |
766 | sk->sk_state = BT_CONNECTED; | |
767 | sk->sk_state_change(sk); | |
768 | } | |
769 | ||
bd3c9e25 GP |
770 | if (sk->sk_type != SOCK_SEQPACKET && |
771 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
772 | l2cap_sock_clear_timer(sk); |
773 | sk->sk_state = BT_CONNECTED; | |
774 | sk->sk_state_change(sk); | |
775 | } else if (sk->sk_state == BT_CONNECT) | |
fc7f8a7e | 776 | l2cap_do_start(chan); |
4e8402a3 | 777 | |
79d554a6 | 778 | bh_unlock_sock(sk); |
4e8402a3 | 779 | } |
79d554a6 | 780 | |
baa7e1fa | 781 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
782 | } |
783 | ||
784 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
785 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
786 | { | |
48454079 | 787 | struct l2cap_chan *chan; |
4e8402a3 MH |
788 | |
789 | BT_DBG("conn %p", conn); | |
790 | ||
baa7e1fa | 791 | read_lock(&conn->chan_lock); |
4e8402a3 | 792 | |
baa7e1fa | 793 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 794 | struct sock *sk = chan->sk; |
baa7e1fa | 795 | |
4343478f | 796 | if (chan->force_reliable) |
4e8402a3 MH |
797 | sk->sk_err = err; |
798 | } | |
799 | ||
baa7e1fa | 800 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
801 | } |
802 | ||
803 | static void l2cap_info_timeout(unsigned long arg) | |
804 | { | |
805 | struct l2cap_conn *conn = (void *) arg; | |
806 | ||
984947dc | 807 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 808 | conn->info_ident = 0; |
984947dc | 809 | |
4e8402a3 MH |
810 | l2cap_conn_start(conn); |
811 | } | |
812 | ||
1da177e4 LT |
813 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
814 | { | |
0139418c | 815 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 816 | |
0139418c | 817 | if (conn || status) |
1da177e4 LT |
818 | return conn; |
819 | ||
0139418c MH |
820 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
821 | if (!conn) | |
1da177e4 | 822 | return NULL; |
1da177e4 LT |
823 | |
824 | hcon->l2cap_data = conn; | |
825 | conn->hcon = hcon; | |
826 | ||
0139418c MH |
827 | BT_DBG("hcon %p conn %p", hcon, conn); |
828 | ||
acd7d370 VT |
829 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
830 | conn->mtu = hcon->hdev->le_mtu; | |
831 | else | |
832 | conn->mtu = hcon->hdev->acl_mtu; | |
833 | ||
1da177e4 LT |
834 | conn->src = &hcon->hdev->bdaddr; |
835 | conn->dst = &hcon->dst; | |
836 | ||
4e8402a3 MH |
837 | conn->feat_mask = 0; |
838 | ||
1da177e4 | 839 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
840 | rwlock_init(&conn->chan_lock); |
841 | ||
842 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 843 | |
b62f328b VT |
844 | if (hcon->type != LE_LINK) |
845 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
846 | (unsigned long) conn); |
847 | ||
2950f21a MH |
848 | conn->disc_reason = 0x13; |
849 | ||
1da177e4 LT |
850 | return conn; |
851 | } | |
852 | ||
0139418c | 853 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 854 | { |
0139418c | 855 | struct l2cap_conn *conn = hcon->l2cap_data; |
baa7e1fa | 856 | struct l2cap_chan *chan, *l; |
1da177e4 LT |
857 | struct sock *sk; |
858 | ||
0139418c MH |
859 | if (!conn) |
860 | return; | |
1da177e4 LT |
861 | |
862 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
863 | ||
7585b97a | 864 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
865 | |
866 | /* Kill channels */ | |
baa7e1fa | 867 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
48454079 | 868 | sk = chan->sk; |
1da177e4 | 869 | bh_lock_sock(sk); |
48454079 | 870 | l2cap_chan_del(chan, err); |
1da177e4 LT |
871 | bh_unlock_sock(sk); |
872 | l2cap_sock_kill(sk); | |
873 | } | |
874 | ||
8e8440f5 DY |
875 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
876 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 877 | |
1da177e4 LT |
878 | hcon->l2cap_data = NULL; |
879 | kfree(conn); | |
1da177e4 LT |
880 | } |
881 | ||
48454079 | 882 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 883 | { |
baa7e1fa | 884 | write_lock_bh(&conn->chan_lock); |
48454079 | 885 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 886 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
887 | } |
888 | ||
1da177e4 | 889 | /* ---- Socket interface ---- */ |
1da177e4 LT |
890 | |
891 | /* Find socket with psm and source bdaddr. | |
892 | * Returns closest match. | |
893 | */ | |
23691d75 | 894 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 895 | { |
23691d75 | 896 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 897 | |
23691d75 | 898 | read_lock(&chan_list_lock); |
e0f0cb56 | 899 | |
23691d75 GP |
900 | list_for_each_entry(c, &chan_list, global_l) { |
901 | struct sock *sk = c->sk; | |
fe4128e0 | 902 | |
1da177e4 LT |
903 | if (state && sk->sk_state != state) |
904 | continue; | |
905 | ||
23691d75 | 906 | if (c->psm == psm) { |
1da177e4 | 907 | /* Exact match. */ |
23691d75 | 908 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 909 | read_unlock(&chan_list_lock); |
23691d75 GP |
910 | return c; |
911 | } | |
1da177e4 LT |
912 | |
913 | /* Closest match */ | |
914 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 915 | c1 = c; |
1da177e4 LT |
916 | } |
917 | } | |
1da177e4 | 918 | |
23691d75 | 919 | read_unlock(&chan_list_lock); |
e0f0cb56 | 920 | |
23691d75 | 921 | return c1; |
1da177e4 LT |
922 | } |
923 | ||
77a74c7e | 924 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 925 | { |
5d41ce1d | 926 | struct sock *sk = chan->sk; |
1da177e4 LT |
927 | bdaddr_t *src = &bt_sk(sk)->src; |
928 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
929 | struct l2cap_conn *conn; | |
930 | struct hci_conn *hcon; | |
931 | struct hci_dev *hdev; | |
09ab6f4c | 932 | __u8 auth_type; |
44d0e48e | 933 | int err; |
1da177e4 | 934 | |
f29972de | 935 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 936 | chan->psm); |
1da177e4 | 937 | |
af05b30b GP |
938 | hdev = hci_get_route(dst, src); |
939 | if (!hdev) | |
1da177e4 LT |
940 | return -EHOSTUNREACH; |
941 | ||
942 | hci_dev_lock_bh(hdev); | |
943 | ||
4343478f | 944 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 945 | |
fe4128e0 | 946 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 947 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 948 | chan->sec_level, auth_type); |
acd7d370 VT |
949 | else |
950 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 951 | chan->sec_level, auth_type); |
acd7d370 | 952 | |
30e76272 VT |
953 | if (IS_ERR(hcon)) { |
954 | err = PTR_ERR(hcon); | |
1da177e4 | 955 | goto done; |
30e76272 | 956 | } |
1da177e4 LT |
957 | |
958 | conn = l2cap_conn_add(hcon, 0); | |
959 | if (!conn) { | |
960 | hci_conn_put(hcon); | |
30e76272 | 961 | err = -ENOMEM; |
1da177e4 LT |
962 | goto done; |
963 | } | |
964 | ||
1da177e4 LT |
965 | /* Update source addr of the socket */ |
966 | bacpy(src, conn->src); | |
967 | ||
48454079 GP |
968 | l2cap_chan_add(conn, chan); |
969 | ||
1da177e4 LT |
970 | sk->sk_state = BT_CONNECT; |
971 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
972 | ||
973 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
974 | if (sk->sk_type != SOCK_SEQPACKET && |
975 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 976 | l2cap_sock_clear_timer(sk); |
4343478f | 977 | if (l2cap_check_security(chan)) |
d00ef24f | 978 | sk->sk_state = BT_CONNECTED; |
79d554a6 | 979 | } else |
fc7f8a7e | 980 | l2cap_do_start(chan); |
1da177e4 LT |
981 | } |
982 | ||
30e76272 VT |
983 | err = 0; |
984 | ||
1da177e4 LT |
985 | done: |
986 | hci_dev_unlock_bh(hdev); | |
987 | hci_dev_put(hdev); | |
988 | return err; | |
989 | } | |
990 | ||
dcba0dba | 991 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 992 | { |
8c1d787b | 993 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
994 | DECLARE_WAITQUEUE(wait, current); |
995 | int err = 0; | |
996 | int timeo = HZ/5; | |
997 | ||
2b0b05dd | 998 | add_wait_queue(sk_sleep(sk), &wait); |
8c1d787b | 999 | while ((chan->unacked_frames > 0 && chan->conn)) { |
6161c038 GP |
1000 | set_current_state(TASK_INTERRUPTIBLE); |
1001 | ||
1002 | if (!timeo) | |
1003 | timeo = HZ/5; | |
1004 | ||
1005 | if (signal_pending(current)) { | |
1006 | err = sock_intr_errno(timeo); | |
1007 | break; | |
1008 | } | |
1009 | ||
1010 | release_sock(sk); | |
1011 | timeo = schedule_timeout(timeo); | |
1012 | lock_sock(sk); | |
1013 | ||
1014 | err = sock_error(sk); | |
1015 | if (err) | |
1016 | break; | |
1017 | } | |
1018 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1019 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1020 | return err; |
1021 | } | |
1022 | ||
e90bac06 GP |
1023 | static void l2cap_monitor_timeout(unsigned long arg) |
1024 | { | |
525cd185 GP |
1025 | struct l2cap_chan *chan = (void *) arg; |
1026 | struct sock *sk = chan->sk; | |
e90bac06 | 1027 | |
525cd185 | 1028 | BT_DBG("chan %p", chan); |
0e98958d | 1029 | |
e686219a | 1030 | bh_lock_sock(sk); |
2c03a7a4 | 1031 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1032 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1033 | bh_unlock_sock(sk); |
e90bac06 GP |
1034 | return; |
1035 | } | |
1036 | ||
6a026610 | 1037 | chan->retry_count++; |
e90bac06 GP |
1038 | __mod_monitor_timer(); |
1039 | ||
525cd185 | 1040 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1041 | bh_unlock_sock(sk); |
e90bac06 GP |
1042 | } |
1043 | ||
1044 | static void l2cap_retrans_timeout(unsigned long arg) | |
1045 | { | |
525cd185 GP |
1046 | struct l2cap_chan *chan = (void *) arg; |
1047 | struct sock *sk = chan->sk; | |
e90bac06 | 1048 | |
49208c9c | 1049 | BT_DBG("chan %p", chan); |
0e98958d | 1050 | |
e686219a | 1051 | bh_lock_sock(sk); |
6a026610 | 1052 | chan->retry_count = 1; |
e90bac06 GP |
1053 | __mod_monitor_timer(); |
1054 | ||
525cd185 | 1055 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
e90bac06 | 1056 | |
525cd185 | 1057 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1058 | bh_unlock_sock(sk); |
e90bac06 GP |
1059 | } |
1060 | ||
42e5c802 | 1061 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1062 | { |
1c2acffb | 1063 | struct sk_buff *skb; |
1da177e4 | 1064 | |
58d35f87 | 1065 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1066 | chan->unacked_frames) { |
42e5c802 | 1067 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1068 | break; |
1da177e4 | 1069 | |
58d35f87 | 1070 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1071 | kfree_skb(skb); |
1da177e4 | 1072 | |
6a026610 | 1073 | chan->unacked_frames--; |
1c2acffb | 1074 | } |
1da177e4 | 1075 | |
6a026610 | 1076 | if (!chan->unacked_frames) |
e92c8e70 | 1077 | del_timer(&chan->retrans_timer); |
1c2acffb | 1078 | } |
1da177e4 | 1079 | |
4343478f | 1080 | void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1081 | { |
8c1d787b | 1082 | struct hci_conn *hcon = chan->conn->hcon; |
e702112f | 1083 | u16 flags; |
1c2acffb | 1084 | |
4343478f | 1085 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1086 | |
4343478f | 1087 | if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) |
e702112f AE |
1088 | flags = ACL_START_NO_FLUSH; |
1089 | else | |
1090 | flags = ACL_START; | |
1091 | ||
1092 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1093 | } |
1094 | ||
42e5c802 | 1095 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1096 | { |
ccbb84af | 1097 | struct sk_buff *skb; |
fcc203c3 | 1098 | u16 control, fcs; |
6840ed07 | 1099 | |
58d35f87 | 1100 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1101 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1102 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1103 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1104 | |
47d1ec61 | 1105 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1106 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1107 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1108 | } |
1109 | ||
4343478f | 1110 | l2cap_do_send(chan, skb); |
6840ed07 | 1111 | |
42e5c802 | 1112 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1113 | } |
6840ed07 GP |
1114 | } |
1115 | ||
525cd185 | 1116 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1117 | { |
8f17154f GP |
1118 | struct sk_buff *skb, *tx_skb; |
1119 | u16 control, fcs; | |
8f17154f | 1120 | |
58d35f87 | 1121 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1122 | if (!skb) |
1123 | return; | |
8f17154f | 1124 | |
f11d676d GP |
1125 | do { |
1126 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1127 | break; |
8f17154f | 1128 | |
58d35f87 | 1129 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1130 | return; |
8f17154f | 1131 | |
58d35f87 | 1132 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1133 | |
2c03a7a4 GP |
1134 | if (chan->remote_max_tx && |
1135 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1136 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1137 | return; |
1138 | } | |
1139 | ||
1140 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1141 | bt_cb(skb)->retries++; | |
1142 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1143 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1144 | |
525cd185 | 1145 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
3cb123d1 | 1146 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1147 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 1148 | } |
95ffa978 | 1149 | |
42e5c802 | 1150 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1151 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1152 | |
f11d676d GP |
1153 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1154 | ||
47d1ec61 | 1155 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1156 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1157 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1158 | } | |
1159 | ||
4343478f | 1160 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1161 | } |
1162 | ||
525cd185 | 1163 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1164 | { |
1165 | struct sk_buff *skb, *tx_skb; | |
525cd185 | 1166 | struct sock *sk = chan->sk; |
fcc203c3 | 1167 | u16 control, fcs; |
9a9c6a34 | 1168 | int nsent = 0; |
1c2acffb | 1169 | |
c13ffa62 GP |
1170 | if (sk->sk_state != BT_CONNECTED) |
1171 | return -ENOTCONN; | |
e90bac06 | 1172 | |
58d35f87 | 1173 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1174 | |
2c03a7a4 GP |
1175 | if (chan->remote_max_tx && |
1176 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1177 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1178 | break; |
1179 | } | |
1180 | ||
e420aba3 AE |
1181 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1182 | ||
e90bac06 GP |
1183 | bt_cb(skb)->retries++; |
1184 | ||
1c2acffb | 1185 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1186 | control &= L2CAP_CTRL_SAR; |
1187 | ||
525cd185 | 1188 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
d5392c8f | 1189 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1190 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
d5392c8f | 1191 | } |
42e5c802 GP |
1192 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1193 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1194 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1195 | ||
e90bac06 | 1196 | |
47d1ec61 | 1197 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1198 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1199 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1200 | } | |
1201 | ||
4343478f | 1202 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1203 | |
e90bac06 | 1204 | __mod_retrans_timer(); |
1c2acffb | 1205 | |
42e5c802 GP |
1206 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1207 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1208 | |
23e9fde2 | 1209 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1210 | chan->unacked_frames++; |
23e9fde2 | 1211 | |
6a026610 | 1212 | chan->frames_sent++; |
1c2acffb | 1213 | |
58d35f87 GP |
1214 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1215 | chan->tx_send_head = NULL; | |
1c2acffb | 1216 | else |
58d35f87 | 1217 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1218 | |
1219 | nsent++; | |
1c2acffb GP |
1220 | } |
1221 | ||
9e917af1 GP |
1222 | return nsent; |
1223 | } | |
1224 | ||
525cd185 | 1225 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1226 | { |
dfc909be GP |
1227 | int ret; |
1228 | ||
58d35f87 GP |
1229 | if (!skb_queue_empty(&chan->tx_q)) |
1230 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1231 | |
42e5c802 | 1232 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1233 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1234 | return ret; |
1235 | } | |
1236 | ||
525cd185 | 1237 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1238 | { |
9e917af1 GP |
1239 | u16 control = 0; |
1240 | ||
42e5c802 | 1241 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1242 | |
525cd185 | 1243 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
9e917af1 | 1244 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
1245 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1246 | l2cap_send_sframe(chan, control); | |
9a9c6a34 | 1247 | return; |
9e917af1 | 1248 | } |
dfc909be | 1249 | |
525cd185 | 1250 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1251 | return; |
1252 | ||
1253 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1254 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1255 | } |
1256 | ||
525cd185 | 1257 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1258 | { |
1259 | struct srej_list *tail; | |
1260 | u16 control; | |
1261 | ||
1262 | control = L2CAP_SUPER_SELECT_REJECT; | |
1263 | control |= L2CAP_CTRL_FINAL; | |
1264 | ||
39d5a3ee | 1265 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1266 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1267 | ||
525cd185 | 1268 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1269 | } |
1270 | ||
1c2acffb GP |
1271 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1272 | { | |
8c1d787b | 1273 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1274 | struct sk_buff **frag; |
1275 | int err, sent = 0; | |
1da177e4 | 1276 | |
59203a21 | 1277 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1278 | return -EFAULT; |
1da177e4 LT |
1279 | |
1280 | sent += count; | |
1281 | len -= count; | |
1282 | ||
1283 | /* Continuation fragments (no L2CAP header) */ | |
1284 | frag = &skb_shinfo(skb)->frag_list; | |
1285 | while (len) { | |
1286 | count = min_t(unsigned int, conn->mtu, len); | |
1287 | ||
1288 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1289 | if (!*frag) | |
0175d629 | 1290 | return err; |
1c2acffb GP |
1291 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1292 | return -EFAULT; | |
1da177e4 LT |
1293 | |
1294 | sent += count; | |
1295 | len -= count; | |
1296 | ||
1297 | frag = &(*frag)->next; | |
1298 | } | |
1da177e4 LT |
1299 | |
1300 | return sent; | |
1c2acffb | 1301 | } |
1da177e4 | 1302 | |
fe4128e0 | 1303 | struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1304 | { |
fe4128e0 | 1305 | struct sock *sk = chan->sk; |
8c1d787b | 1306 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1307 | struct sk_buff *skb; |
1308 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1309 | struct l2cap_hdr *lh; | |
1310 | ||
1311 | BT_DBG("sk %p len %d", sk, (int)len); | |
1312 | ||
1313 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1314 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1315 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1316 | if (!skb) | |
0175d629 | 1317 | return ERR_PTR(err); |
1c2acffb GP |
1318 | |
1319 | /* Create L2CAP header */ | |
1320 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1321 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1322 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1323 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1324 | |
1325 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1326 | if (unlikely(err < 0)) { | |
1327 | kfree_skb(skb); | |
1328 | return ERR_PTR(err); | |
1329 | } | |
1330 | return skb; | |
1331 | } | |
1332 | ||
fe4128e0 | 1333 | struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
1c2acffb | 1334 | { |
fe4128e0 | 1335 | struct sock *sk = chan->sk; |
8c1d787b | 1336 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1337 | struct sk_buff *skb; |
1338 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1339 | struct l2cap_hdr *lh; | |
1340 | ||
1341 | BT_DBG("sk %p len %d", sk, (int)len); | |
1342 | ||
1343 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1344 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1345 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1346 | if (!skb) | |
0175d629 | 1347 | return ERR_PTR(err); |
1c2acffb GP |
1348 | |
1349 | /* Create L2CAP header */ | |
1350 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1351 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1352 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1353 | ||
1354 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1355 | if (unlikely(err < 0)) { | |
1356 | kfree_skb(skb); | |
1357 | return ERR_PTR(err); | |
1358 | } | |
1359 | return skb; | |
1360 | } | |
1361 | ||
47d1ec61 | 1362 | struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb | 1363 | { |
47d1ec61 | 1364 | struct sock *sk = chan->sk; |
8c1d787b | 1365 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1366 | struct sk_buff *skb; |
1367 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1368 | struct l2cap_hdr *lh; | |
1369 | ||
1370 | BT_DBG("sk %p len %d", sk, (int)len); | |
1371 | ||
0ee0d208 GP |
1372 | if (!conn) |
1373 | return ERR_PTR(-ENOTCONN); | |
1374 | ||
c74e560c GP |
1375 | if (sdulen) |
1376 | hlen += 2; | |
1377 | ||
47d1ec61 | 1378 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1379 | hlen += 2; |
1380 | ||
1c2acffb GP |
1381 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1382 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1383 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1384 | if (!skb) | |
0175d629 | 1385 | return ERR_PTR(err); |
1c2acffb GP |
1386 | |
1387 | /* Create L2CAP header */ | |
1388 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1389 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1390 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1391 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1392 | if (sdulen) |
1393 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1394 | |
1395 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1396 | if (unlikely(err < 0)) { | |
1397 | kfree_skb(skb); | |
1398 | return ERR_PTR(err); | |
1399 | } | |
e90bac06 | 1400 | |
47d1ec61 | 1401 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1402 | put_unaligned_le16(0, skb_put(skb, 2)); |
1403 | ||
e90bac06 | 1404 | bt_cb(skb)->retries = 0; |
1c2acffb | 1405 | return skb; |
1da177e4 LT |
1406 | } |
1407 | ||
2c03a7a4 | 1408 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1409 | { |
c74e560c GP |
1410 | struct sk_buff *skb; |
1411 | struct sk_buff_head sar_queue; | |
1412 | u16 control; | |
1413 | size_t size = 0; | |
1414 | ||
ff12fd64 | 1415 | skb_queue_head_init(&sar_queue); |
c74e560c | 1416 | control = L2CAP_SDU_START; |
47d1ec61 | 1417 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1418 | if (IS_ERR(skb)) |
1419 | return PTR_ERR(skb); | |
1420 | ||
1421 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1422 | len -= chan->remote_mps; |
1423 | size += chan->remote_mps; | |
c74e560c GP |
1424 | |
1425 | while (len > 0) { | |
1426 | size_t buflen; | |
1427 | ||
2c03a7a4 | 1428 | if (len > chan->remote_mps) { |
44651b85 | 1429 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1430 | buflen = chan->remote_mps; |
c74e560c | 1431 | } else { |
44651b85 | 1432 | control = L2CAP_SDU_END; |
c74e560c GP |
1433 | buflen = len; |
1434 | } | |
1435 | ||
47d1ec61 | 1436 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1437 | if (IS_ERR(skb)) { |
1438 | skb_queue_purge(&sar_queue); | |
1439 | return PTR_ERR(skb); | |
1440 | } | |
1441 | ||
1442 | __skb_queue_tail(&sar_queue, skb); | |
1443 | len -= buflen; | |
1444 | size += buflen; | |
c74e560c | 1445 | } |
58d35f87 GP |
1446 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1447 | if (chan->tx_send_head == NULL) | |
1448 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1449 | |
1450 | return size; | |
1451 | } | |
1452 | ||
1da177e4 LT |
1453 | static void l2cap_chan_ready(struct sock *sk) |
1454 | { | |
1455 | struct sock *parent = bt_sk(sk)->parent; | |
b4450035 | 1456 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1da177e4 LT |
1457 | |
1458 | BT_DBG("sk %p, parent %p", sk, parent); | |
1459 | ||
b4450035 | 1460 | chan->conf_state = 0; |
1da177e4 LT |
1461 | l2cap_sock_clear_timer(sk); |
1462 | ||
1463 | if (!parent) { | |
1464 | /* Outgoing channel. | |
1465 | * Wake up socket sleeping on connect. | |
1466 | */ | |
1467 | sk->sk_state = BT_CONNECTED; | |
1468 | sk->sk_state_change(sk); | |
1469 | } else { | |
1470 | /* Incoming channel. | |
1471 | * Wake up socket sleeping on accept. | |
1472 | */ | |
1473 | parent->sk_data_ready(parent, 0); | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | /* Copy frame to all raw sockets on that connection */ | |
1478 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1479 | { | |
1da177e4 | 1480 | struct sk_buff *nskb; |
48454079 | 1481 | struct l2cap_chan *chan; |
1da177e4 LT |
1482 | |
1483 | BT_DBG("conn %p", conn); | |
1484 | ||
baa7e1fa GP |
1485 | read_lock(&conn->chan_lock); |
1486 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1487 | struct sock *sk = chan->sk; |
1da177e4 LT |
1488 | if (sk->sk_type != SOCK_RAW) |
1489 | continue; | |
1490 | ||
1491 | /* Don't send frame to the socket it came from */ | |
1492 | if (skb->sk == sk) | |
1493 | continue; | |
af05b30b GP |
1494 | nskb = skb_clone(skb, GFP_ATOMIC); |
1495 | if (!nskb) | |
1da177e4 LT |
1496 | continue; |
1497 | ||
1498 | if (sock_queue_rcv_skb(sk, nskb)) | |
1499 | kfree_skb(nskb); | |
1500 | } | |
baa7e1fa | 1501 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | /* ---- L2CAP signalling commands ---- */ | |
1505 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1506 | u8 code, u8 ident, u16 dlen, void *data) | |
1507 | { | |
1508 | struct sk_buff *skb, **frag; | |
1509 | struct l2cap_cmd_hdr *cmd; | |
1510 | struct l2cap_hdr *lh; | |
1511 | int len, count; | |
1512 | ||
af05b30b GP |
1513 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1514 | conn, code, ident, dlen); | |
1da177e4 LT |
1515 | |
1516 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1517 | count = min_t(unsigned int, conn->mtu, len); | |
1518 | ||
1519 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1520 | if (!skb) | |
1521 | return NULL; | |
1522 | ||
1523 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1524 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1525 | |
1526 | if (conn->hcon->type == LE_LINK) | |
1527 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1528 | else | |
1529 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1530 | |
1531 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1532 | cmd->code = code; | |
1533 | cmd->ident = ident; | |
aca3192c | 1534 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1535 | |
1536 | if (dlen) { | |
1537 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1538 | memcpy(skb_put(skb, count), data, count); | |
1539 | data += count; | |
1540 | } | |
1541 | ||
1542 | len -= skb->len; | |
1543 | ||
1544 | /* Continuation fragments (no L2CAP header) */ | |
1545 | frag = &skb_shinfo(skb)->frag_list; | |
1546 | while (len) { | |
1547 | count = min_t(unsigned int, conn->mtu, len); | |
1548 | ||
1549 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1550 | if (!*frag) | |
1551 | goto fail; | |
1552 | ||
1553 | memcpy(skb_put(*frag, count), data, count); | |
1554 | ||
1555 | len -= count; | |
1556 | data += count; | |
1557 | ||
1558 | frag = &(*frag)->next; | |
1559 | } | |
1560 | ||
1561 | return skb; | |
1562 | ||
1563 | fail: | |
1564 | kfree_skb(skb); | |
1565 | return NULL; | |
1566 | } | |
1567 | ||
1568 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1569 | { | |
1570 | struct l2cap_conf_opt *opt = *ptr; | |
1571 | int len; | |
1572 | ||
1573 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1574 | *ptr += len; | |
1575 | ||
1576 | *type = opt->type; | |
1577 | *olen = opt->len; | |
1578 | ||
1579 | switch (opt->len) { | |
1580 | case 1: | |
1581 | *val = *((u8 *) opt->val); | |
1582 | break; | |
1583 | ||
1584 | case 2: | |
bfaaeb3e | 1585 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1586 | break; |
1587 | ||
1588 | case 4: | |
bfaaeb3e | 1589 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1590 | break; |
1591 | ||
1592 | default: | |
1593 | *val = (unsigned long) opt->val; | |
1594 | break; | |
1595 | } | |
1596 | ||
1597 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1598 | return len; | |
1599 | } | |
1600 | ||
1da177e4 LT |
1601 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1602 | { | |
1603 | struct l2cap_conf_opt *opt = *ptr; | |
1604 | ||
1605 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1606 | ||
1607 | opt->type = type; | |
1608 | opt->len = len; | |
1609 | ||
1610 | switch (len) { | |
1611 | case 1: | |
1612 | *((u8 *) opt->val) = val; | |
1613 | break; | |
1614 | ||
1615 | case 2: | |
4f8b691c | 1616 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1617 | break; |
1618 | ||
1619 | case 4: | |
4f8b691c | 1620 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1621 | break; |
1622 | ||
1623 | default: | |
1624 | memcpy(opt->val, (void *) val, len); | |
1625 | break; | |
1626 | } | |
1627 | ||
1628 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1629 | } | |
1630 | ||
c1b4f43b GP |
1631 | static void l2cap_ack_timeout(unsigned long arg) |
1632 | { | |
525cd185 | 1633 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1634 | |
525cd185 GP |
1635 | bh_lock_sock(chan->sk); |
1636 | l2cap_send_ack(chan); | |
1637 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1638 | } |
1639 | ||
525cd185 | 1640 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1641 | { |
525cd185 GP |
1642 | struct sock *sk = chan->sk; |
1643 | ||
42e5c802 | 1644 | chan->expected_ack_seq = 0; |
6a026610 | 1645 | chan->unacked_frames = 0; |
42e5c802 | 1646 | chan->buffer_seq = 0; |
6a026610 GP |
1647 | chan->num_acked = 0; |
1648 | chan->frames_sent = 0; | |
0565c1c2 | 1649 | |
e92c8e70 GP |
1650 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1651 | (unsigned long) chan); | |
1652 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1653 | (unsigned long) chan); | |
1654 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1655 | |
f1c6775b GP |
1656 | skb_queue_head_init(&chan->srej_q); |
1657 | skb_queue_head_init(&chan->busy_q); | |
1890d36b | 1658 | |
39d5a3ee GP |
1659 | INIT_LIST_HEAD(&chan->srej_l); |
1660 | ||
311bb895 | 1661 | INIT_WORK(&chan->busy_work, l2cap_busy_work); |
218bb9df GP |
1662 | |
1663 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1664 | } |
1665 | ||
f2fcfcd6 GP |
1666 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1667 | { | |
1668 | switch (mode) { | |
1669 | case L2CAP_MODE_STREAMING: | |
1670 | case L2CAP_MODE_ERTM: | |
1671 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1672 | return mode; | |
1673 | /* fall through */ | |
1674 | default: | |
1675 | return L2CAP_MODE_BASIC; | |
1676 | } | |
1677 | } | |
1678 | ||
710f9b0a | 1679 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1680 | { |
1da177e4 | 1681 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1682 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1683 | void *ptr = req->data; |
1684 | ||
49208c9c | 1685 | BT_DBG("chan %p", chan); |
1da177e4 | 1686 | |
73ffa904 | 1687 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1688 | goto done; |
1689 | ||
0c1bc5c6 | 1690 | switch (chan->mode) { |
f2fcfcd6 GP |
1691 | case L2CAP_MODE_STREAMING: |
1692 | case L2CAP_MODE_ERTM: | |
b4450035 | 1693 | if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1694 | break; |
85eb53c6 | 1695 | |
2ba13ed6 | 1696 | /* fall through */ |
f2fcfcd6 | 1697 | default: |
8c1d787b | 1698 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
1699 | break; |
1700 | } | |
1701 | ||
1702 | done: | |
0c1bc5c6 GP |
1703 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1704 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1705 | |
0c1bc5c6 | 1706 | switch (chan->mode) { |
65c7c491 | 1707 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
1708 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1709 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
1710 | break; |
1711 | ||
62547752 GP |
1712 | rfc.mode = L2CAP_MODE_BASIC; |
1713 | rfc.txwin_size = 0; | |
1714 | rfc.max_transmit = 0; | |
1715 | rfc.retrans_timeout = 0; | |
1716 | rfc.monitor_timeout = 0; | |
1717 | rfc.max_pdu_size = 0; | |
1718 | ||
63406504 GP |
1719 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1720 | (unsigned long) &rfc); | |
65c7c491 MH |
1721 | break; |
1722 | ||
1723 | case L2CAP_MODE_ERTM: | |
1724 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 GP |
1725 | rfc.txwin_size = chan->tx_win; |
1726 | rfc.max_transmit = chan->max_tx; | |
f2fcfcd6 GP |
1727 | rfc.retrans_timeout = 0; |
1728 | rfc.monitor_timeout = 0; | |
c74e560c | 1729 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1730 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1731 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
f2fcfcd6 | 1732 | |
63406504 GP |
1733 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1734 | (unsigned long) &rfc); | |
1735 | ||
8c1d787b | 1736 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1737 | break; |
1738 | ||
47d1ec61 | 1739 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1740 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1741 | chan->fcs = L2CAP_FCS_NONE; |
1742 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1743 | } |
f2fcfcd6 GP |
1744 | break; |
1745 | ||
1746 | case L2CAP_MODE_STREAMING: | |
1747 | rfc.mode = L2CAP_MODE_STREAMING; | |
1748 | rfc.txwin_size = 0; | |
1749 | rfc.max_transmit = 0; | |
1750 | rfc.retrans_timeout = 0; | |
1751 | rfc.monitor_timeout = 0; | |
c74e560c | 1752 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
8c1d787b GP |
1753 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10) |
1754 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
65c7c491 | 1755 | |
63406504 GP |
1756 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1757 | (unsigned long) &rfc); | |
1758 | ||
8c1d787b | 1759 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
1760 | break; |
1761 | ||
47d1ec61 | 1762 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1763 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1764 | chan->fcs = L2CAP_FCS_NONE; |
1765 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1766 | } |
65c7c491 MH |
1767 | break; |
1768 | } | |
1da177e4 | 1769 | |
fe4128e0 | 1770 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 1771 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
1772 | |
1773 | return ptr - data; | |
1774 | } | |
1775 | ||
73ffa904 | 1776 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1777 | { |
5dee9e7c MH |
1778 | struct l2cap_conf_rsp *rsp = data; |
1779 | void *ptr = rsp->data; | |
73ffa904 GP |
1780 | void *req = chan->conf_req; |
1781 | int len = chan->conf_len; | |
5dee9e7c MH |
1782 | int type, hint, olen; |
1783 | unsigned long val; | |
6464f35f | 1784 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1785 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1786 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1787 | |
73ffa904 | 1788 | BT_DBG("chan %p", chan); |
820ae1b8 | 1789 | |
5dee9e7c MH |
1790 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1791 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1792 | |
589d2746 | 1793 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1794 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1795 | |
1796 | switch (type) { | |
1797 | case L2CAP_CONF_MTU: | |
861d6882 | 1798 | mtu = val; |
5dee9e7c MH |
1799 | break; |
1800 | ||
1801 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 1802 | chan->flush_to = val; |
5dee9e7c MH |
1803 | break; |
1804 | ||
1805 | case L2CAP_CONF_QOS: | |
1806 | break; | |
1807 | ||
6464f35f MH |
1808 | case L2CAP_CONF_RFC: |
1809 | if (olen == sizeof(rfc)) | |
1810 | memcpy(&rfc, (void *) val, olen); | |
1811 | break; | |
1812 | ||
fcc203c3 GP |
1813 | case L2CAP_CONF_FCS: |
1814 | if (val == L2CAP_FCS_NONE) | |
b4450035 | 1815 | chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; |
fcc203c3 GP |
1816 | |
1817 | break; | |
1818 | ||
5dee9e7c MH |
1819 | default: |
1820 | if (hint) | |
1821 | break; | |
1822 | ||
1823 | result = L2CAP_CONF_UNKNOWN; | |
1824 | *((u8 *) ptr++) = type; | |
1825 | break; | |
1826 | } | |
1827 | } | |
1828 | ||
73ffa904 | 1829 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
1830 | goto done; |
1831 | ||
0c1bc5c6 | 1832 | switch (chan->mode) { |
f2fcfcd6 GP |
1833 | case L2CAP_MODE_STREAMING: |
1834 | case L2CAP_MODE_ERTM: | |
b4450035 | 1835 | if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
0c1bc5c6 | 1836 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 1837 | chan->conn->feat_mask); |
85eb53c6 GP |
1838 | break; |
1839 | } | |
1840 | ||
0c1bc5c6 | 1841 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 1842 | return -ECONNREFUSED; |
742e519b | 1843 | |
f2fcfcd6 | 1844 | break; |
f2fcfcd6 GP |
1845 | } |
1846 | ||
1847 | done: | |
0c1bc5c6 | 1848 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 1849 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 1850 | rfc.mode = chan->mode; |
f2fcfcd6 | 1851 | |
73ffa904 | 1852 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
1853 | return -ECONNREFUSED; |
1854 | ||
1855 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1856 | sizeof(rfc), (unsigned long) &rfc); | |
1857 | } | |
1858 | ||
1859 | ||
5dee9e7c MH |
1860 | if (result == L2CAP_CONF_SUCCESS) { |
1861 | /* Configure output options and let the other side know | |
1862 | * which ones we don't like. */ | |
1863 | ||
f2fcfcd6 GP |
1864 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1865 | result = L2CAP_CONF_UNACCEPT; | |
1866 | else { | |
0c1bc5c6 | 1867 | chan->omtu = mtu; |
b4450035 | 1868 | chan->conf_state |= L2CAP_CONF_MTU_DONE; |
f2fcfcd6 | 1869 | } |
0c1bc5c6 | 1870 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 1871 | |
f2fcfcd6 GP |
1872 | switch (rfc.mode) { |
1873 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 1874 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 1875 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
f2fcfcd6 GP |
1876 | break; |
1877 | ||
1878 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
1879 | chan->remote_tx_win = rfc.txwin_size; |
1880 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 | 1881 | |
8c1d787b GP |
1882 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
1883 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 1884 | |
2c03a7a4 | 1885 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1886 | |
10467e9e GP |
1887 | rfc.retrans_timeout = |
1888 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1889 | rfc.monitor_timeout = | |
1890 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 1891 | |
b4450035 | 1892 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
1893 | |
1894 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1895 | sizeof(rfc), (unsigned long) &rfc); | |
1896 | ||
f2fcfcd6 GP |
1897 | break; |
1898 | ||
1899 | case L2CAP_MODE_STREAMING: | |
8c1d787b GP |
1900 | if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10) |
1901 | rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10); | |
1c762159 | 1902 | |
2c03a7a4 | 1903 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1904 | |
b4450035 | 1905 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
1906 | |
1907 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1908 | sizeof(rfc), (unsigned long) &rfc); | |
1909 | ||
f2fcfcd6 GP |
1910 | break; |
1911 | ||
1912 | default: | |
5dee9e7c | 1913 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1914 | |
6464f35f | 1915 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 1916 | rfc.mode = chan->mode; |
f2fcfcd6 | 1917 | } |
6464f35f | 1918 | |
f2fcfcd6 | 1919 | if (result == L2CAP_CONF_SUCCESS) |
b4450035 | 1920 | chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; |
f2fcfcd6 | 1921 | } |
fe4128e0 | 1922 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
1923 | rsp->result = cpu_to_le16(result); |
1924 | rsp->flags = cpu_to_le16(0x0000); | |
1925 | ||
1926 | return ptr - data; | |
1da177e4 LT |
1927 | } |
1928 | ||
b4450035 | 1929 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 1930 | { |
f2fcfcd6 GP |
1931 | struct l2cap_conf_req *req = data; |
1932 | void *ptr = req->data; | |
1933 | int type, olen; | |
1934 | unsigned long val; | |
1935 | struct l2cap_conf_rfc rfc; | |
1936 | ||
fe4128e0 | 1937 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
1938 | |
1939 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1940 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1941 | ||
1942 | switch (type) { | |
1943 | case L2CAP_CONF_MTU: | |
1944 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1945 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 1946 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1947 | } else |
0c1bc5c6 GP |
1948 | chan->imtu = val; |
1949 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
1950 | break; |
1951 | ||
1952 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 1953 | chan->flush_to = val; |
f2fcfcd6 | 1954 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 1955 | 2, chan->flush_to); |
f2fcfcd6 GP |
1956 | break; |
1957 | ||
1958 | case L2CAP_CONF_RFC: | |
1959 | if (olen == sizeof(rfc)) | |
1960 | memcpy(&rfc, (void *)val, olen); | |
1961 | ||
b4450035 | 1962 | if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && |
0c1bc5c6 | 1963 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
1964 | return -ECONNREFUSED; |
1965 | ||
47d1ec61 | 1966 | chan->fcs = 0; |
f2fcfcd6 GP |
1967 | |
1968 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1969 | sizeof(rfc), (unsigned long) &rfc); | |
1970 | break; | |
1971 | } | |
1972 | } | |
1973 | ||
0c1bc5c6 | 1974 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
1975 | return -ECONNREFUSED; |
1976 | ||
0c1bc5c6 | 1977 | chan->mode = rfc.mode; |
6c2ea7a8 | 1978 | |
f2fcfcd6 GP |
1979 | if (*result == L2CAP_CONF_SUCCESS) { |
1980 | switch (rfc.mode) { | |
1981 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
1982 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1983 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1984 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
1985 | break; |
1986 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 1987 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1988 | } |
1989 | } | |
1990 | ||
fe4128e0 | 1991 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
1992 | req->flags = cpu_to_le16(0x0000); |
1993 | ||
1994 | return ptr - data; | |
1995 | } | |
1996 | ||
fe4128e0 | 1997 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
1998 | { |
1999 | struct l2cap_conf_rsp *rsp = data; | |
2000 | void *ptr = rsp->data; | |
1da177e4 | 2001 | |
fe4128e0 | 2002 | BT_DBG("chan %p", chan); |
1da177e4 | 2003 | |
fe4128e0 | 2004 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2005 | rsp->result = cpu_to_le16(result); |
aca3192c | 2006 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2007 | |
2008 | return ptr - data; | |
2009 | } | |
2010 | ||
8c1d787b | 2011 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2012 | { |
2013 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2014 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2015 | u8 buf[128]; |
2016 | ||
fe4128e0 GP |
2017 | rsp.scid = cpu_to_le16(chan->dcid); |
2018 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2019 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2020 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2021 | l2cap_send_cmd(conn, chan->ident, | |
2022 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2023 | ||
b4450035 | 2024 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
710f9b0a GP |
2025 | return; |
2026 | ||
b4450035 | 2027 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
710f9b0a GP |
2028 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2029 | l2cap_build_conf_req(chan, buf), buf); | |
2030 | chan->num_conf_req++; | |
2031 | } | |
2032 | ||
47d1ec61 | 2033 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2034 | { |
7b1c0049 GP |
2035 | int type, olen; |
2036 | unsigned long val; | |
2037 | struct l2cap_conf_rfc rfc; | |
2038 | ||
47d1ec61 | 2039 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2040 | |
0c1bc5c6 | 2041 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2042 | return; |
2043 | ||
2044 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2045 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2046 | ||
2047 | switch (type) { | |
2048 | case L2CAP_CONF_RFC: | |
2049 | if (olen == sizeof(rfc)) | |
2050 | memcpy(&rfc, (void *)val, olen); | |
2051 | goto done; | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | done: | |
2056 | switch (rfc.mode) { | |
2057 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2058 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2059 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2060 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2061 | break; |
2062 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2063 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2064 | } |
2065 | } | |
2066 | ||
4e8402a3 MH |
2067 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2068 | { | |
2069 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2070 | ||
2071 | if (rej->reason != 0x0000) | |
2072 | return 0; | |
2073 | ||
2074 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2075 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2076 | del_timer(&conn->info_timer); |
984947dc MH |
2077 | |
2078 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2079 | conn->info_ident = 0; |
984947dc | 2080 | |
4e8402a3 MH |
2081 | l2cap_conn_start(conn); |
2082 | } | |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
1da177e4 LT |
2087 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2088 | { | |
1da177e4 LT |
2089 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2090 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2091 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2092 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2093 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2094 | |
2095 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2096 | __le16 psm = req->psm; |
1da177e4 LT |
2097 | |
2098 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2099 | ||
2100 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2101 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2102 | if (!pchan) { | |
1da177e4 LT |
2103 | result = L2CAP_CR_BAD_PSM; |
2104 | goto sendresp; | |
2105 | } | |
2106 | ||
23691d75 GP |
2107 | parent = pchan->sk; |
2108 | ||
e0f0cb56 GP |
2109 | bh_lock_sock(parent); |
2110 | ||
e7c29cb1 MH |
2111 | /* Check if the ACL is secure enough (if not SDP) */ |
2112 | if (psm != cpu_to_le16(0x0001) && | |
2113 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2114 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2115 | result = L2CAP_CR_SEC_BLOCK; |
2116 | goto response; | |
2117 | } | |
2118 | ||
1da177e4 LT |
2119 | result = L2CAP_CR_NO_MEM; |
2120 | ||
2121 | /* Check for backlog size */ | |
2122 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2123 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2124 | goto response; |
2125 | } | |
2126 | ||
3b1e0a65 | 2127 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2128 | if (!sk) |
2129 | goto response; | |
2130 | ||
23691d75 | 2131 | chan = l2cap_chan_create(sk); |
48454079 GP |
2132 | if (!chan) { |
2133 | l2cap_sock_kill(sk); | |
2134 | goto response; | |
2135 | } | |
2136 | ||
5d41ce1d GP |
2137 | l2cap_pi(sk)->chan = chan; |
2138 | ||
baa7e1fa | 2139 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2140 | |
2141 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2142 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2143 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 LT |
2144 | sock_set_flag(sk, SOCK_ZAPPED); |
2145 | l2cap_sock_kill(sk); | |
2146 | goto response; | |
2147 | } | |
2148 | ||
2149 | hci_conn_hold(conn->hcon); | |
2150 | ||
2151 | l2cap_sock_init(sk, parent); | |
2152 | bacpy(&bt_sk(sk)->src, conn->src); | |
2153 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2154 | chan->psm = psm; |
2155 | chan->dcid = scid; | |
1da177e4 | 2156 | |
d1010240 GP |
2157 | bt_accept_enqueue(parent, sk); |
2158 | ||
48454079 GP |
2159 | __l2cap_chan_add(conn, chan); |
2160 | ||
fe4128e0 | 2161 | dcid = chan->scid; |
1da177e4 LT |
2162 | |
2163 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2164 | ||
fc7f8a7e | 2165 | chan->ident = cmd->ident; |
1da177e4 | 2166 | |
984947dc | 2167 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2168 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
2169 | if (bt_sk(sk)->defer_setup) { |
2170 | sk->sk_state = BT_CONNECT2; | |
2171 | result = L2CAP_CR_PEND; | |
2172 | status = L2CAP_CS_AUTHOR_PEND; | |
2173 | parent->sk_data_ready(parent, 0); | |
2174 | } else { | |
2175 | sk->sk_state = BT_CONFIG; | |
2176 | result = L2CAP_CR_SUCCESS; | |
2177 | status = L2CAP_CS_NO_INFO; | |
2178 | } | |
79d554a6 MH |
2179 | } else { |
2180 | sk->sk_state = BT_CONNECT2; | |
2181 | result = L2CAP_CR_PEND; | |
2182 | status = L2CAP_CS_AUTHEN_PEND; | |
2183 | } | |
2184 | } else { | |
2185 | sk->sk_state = BT_CONNECT2; | |
2186 | result = L2CAP_CR_PEND; | |
2187 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2188 | } |
2189 | ||
baa7e1fa | 2190 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2191 | |
2192 | response: | |
2193 | bh_unlock_sock(parent); | |
2194 | ||
2195 | sendresp: | |
aca3192c YH |
2196 | rsp.scid = cpu_to_le16(scid); |
2197 | rsp.dcid = cpu_to_le16(dcid); | |
2198 | rsp.result = cpu_to_le16(result); | |
2199 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2200 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2201 | |
2202 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2203 | struct l2cap_info_req info; | |
2204 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2205 | ||
2206 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2207 | conn->info_ident = l2cap_get_ident(conn); | |
2208 | ||
2209 | mod_timer(&conn->info_timer, jiffies + | |
2210 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2211 | ||
2212 | l2cap_send_cmd(conn, conn->info_ident, | |
2213 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2214 | } | |
2215 | ||
b4450035 | 2216 | if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2217 | result == L2CAP_CR_SUCCESS) { |
2218 | u8 buf[128]; | |
b4450035 | 2219 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2220 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2221 | l2cap_build_conf_req(chan, buf), buf); |
2222 | chan->num_conf_req++; | |
e9aeb2dd GP |
2223 | } |
2224 | ||
1da177e4 LT |
2225 | return 0; |
2226 | } | |
2227 | ||
2228 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2229 | { | |
2230 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2231 | u16 scid, dcid, result, status; | |
48454079 | 2232 | struct l2cap_chan *chan; |
1da177e4 LT |
2233 | struct sock *sk; |
2234 | u8 req[128]; | |
2235 | ||
2236 | scid = __le16_to_cpu(rsp->scid); | |
2237 | dcid = __le16_to_cpu(rsp->dcid); | |
2238 | result = __le16_to_cpu(rsp->result); | |
2239 | status = __le16_to_cpu(rsp->status); | |
2240 | ||
2241 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2242 | ||
2243 | if (scid) { | |
baa7e1fa | 2244 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2245 | if (!chan) |
57d3b22b | 2246 | return -EFAULT; |
1da177e4 | 2247 | } else { |
baa7e1fa | 2248 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2249 | if (!chan) |
57d3b22b | 2250 | return -EFAULT; |
1da177e4 LT |
2251 | } |
2252 | ||
48454079 GP |
2253 | sk = chan->sk; |
2254 | ||
1da177e4 LT |
2255 | switch (result) { |
2256 | case L2CAP_CR_SUCCESS: | |
2257 | sk->sk_state = BT_CONFIG; | |
fc7f8a7e | 2258 | chan->ident = 0; |
fe4128e0 | 2259 | chan->dcid = dcid; |
b4450035 | 2260 | chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
6a8d3010 | 2261 | |
b4450035 | 2262 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
e9aeb2dd GP |
2263 | break; |
2264 | ||
b4450035 | 2265 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2266 | |
1da177e4 | 2267 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2268 | l2cap_build_conf_req(chan, req), req); |
2269 | chan->num_conf_req++; | |
1da177e4 LT |
2270 | break; |
2271 | ||
2272 | case L2CAP_CR_PEND: | |
b4450035 | 2273 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2274 | break; |
2275 | ||
2276 | default: | |
a49184c2 AE |
2277 | /* don't delete l2cap channel if sk is owned by user */ |
2278 | if (sock_owned_by_user(sk)) { | |
2279 | sk->sk_state = BT_DISCONN; | |
2280 | l2cap_sock_clear_timer(sk); | |
2281 | l2cap_sock_set_timer(sk, HZ / 5); | |
2282 | break; | |
2283 | } | |
2284 | ||
48454079 | 2285 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2286 | break; |
2287 | } | |
2288 | ||
2289 | bh_unlock_sock(sk); | |
2290 | return 0; | |
2291 | } | |
2292 | ||
47d1ec61 | 2293 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 | 2294 | { |
47d1ec61 GP |
2295 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
2296 | ||
8c462b60 MM |
2297 | /* FCS is enabled only in ERTM or streaming mode, if one or both |
2298 | * sides request it. | |
2299 | */ | |
0c1bc5c6 | 2300 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2301 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 2302 | else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) |
47d1ec61 | 2303 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2304 | } |
2305 | ||
88219a0f | 2306 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2307 | { |
2308 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2309 | u16 dcid, flags; | |
2310 | u8 rsp[64]; | |
48454079 | 2311 | struct l2cap_chan *chan; |
1da177e4 | 2312 | struct sock *sk; |
5dee9e7c | 2313 | int len; |
1da177e4 LT |
2314 | |
2315 | dcid = __le16_to_cpu(req->dcid); | |
2316 | flags = __le16_to_cpu(req->flags); | |
2317 | ||
2318 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2319 | ||
baa7e1fa | 2320 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2321 | if (!chan) |
1da177e4 LT |
2322 | return -ENOENT; |
2323 | ||
48454079 GP |
2324 | sk = chan->sk; |
2325 | ||
df6bd743 GP |
2326 | if (sk->sk_state != BT_CONFIG) { |
2327 | struct l2cap_cmd_rej rej; | |
2328 | ||
2329 | rej.reason = cpu_to_le16(0x0002); | |
2330 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2331 | sizeof(rej), &rej); | |
354f60a9 | 2332 | goto unlock; |
df6bd743 | 2333 | } |
354f60a9 | 2334 | |
5dee9e7c | 2335 | /* Reject if config buffer is too small. */ |
88219a0f | 2336 | len = cmd_len - sizeof(*req); |
73ffa904 | 2337 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2338 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2339 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2340 | L2CAP_CONF_REJECT, flags), rsp); |
2341 | goto unlock; | |
2342 | } | |
2343 | ||
2344 | /* Store config. */ | |
73ffa904 GP |
2345 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2346 | chan->conf_len += len; | |
1da177e4 LT |
2347 | |
2348 | if (flags & 0x0001) { | |
2349 | /* Incomplete config. Send empty response. */ | |
2350 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2351 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2352 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2353 | goto unlock; |
2354 | } | |
2355 | ||
2356 | /* Complete config. */ | |
73ffa904 | 2357 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2358 | if (len < 0) { |
e92c8e70 | 2359 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2360 | goto unlock; |
f2fcfcd6 | 2361 | } |
1da177e4 | 2362 | |
5dee9e7c | 2363 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2364 | chan->num_conf_rsp++; |
5dee9e7c | 2365 | |
5dee9e7c | 2366 | /* Reset config buffer. */ |
73ffa904 | 2367 | chan->conf_len = 0; |
5dee9e7c | 2368 | |
b4450035 | 2369 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
876d9484 MH |
2370 | goto unlock; |
2371 | ||
b4450035 | 2372 | if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { |
47d1ec61 | 2373 | set_default_fcs(chan); |
fcc203c3 | 2374 | |
1da177e4 | 2375 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2376 | |
42e5c802 GP |
2377 | chan->next_tx_seq = 0; |
2378 | chan->expected_tx_seq = 0; | |
58d35f87 | 2379 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2380 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2381 | l2cap_ertm_init(chan); |
0565c1c2 | 2382 | |
1da177e4 | 2383 | l2cap_chan_ready(sk); |
876d9484 MH |
2384 | goto unlock; |
2385 | } | |
2386 | ||
b4450035 | 2387 | if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { |
79d554a6 | 2388 | u8 buf[64]; |
b4450035 | 2389 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2390 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2391 | l2cap_build_conf_req(chan, buf), buf); |
2392 | chan->num_conf_req++; | |
1da177e4 LT |
2393 | } |
2394 | ||
2395 | unlock: | |
2396 | bh_unlock_sock(sk); | |
2397 | return 0; | |
2398 | } | |
2399 | ||
2400 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2401 | { | |
2402 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2403 | u16 scid, flags, result; | |
48454079 | 2404 | struct l2cap_chan *chan; |
1da177e4 | 2405 | struct sock *sk; |
7b1c0049 | 2406 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2407 | |
2408 | scid = __le16_to_cpu(rsp->scid); | |
2409 | flags = __le16_to_cpu(rsp->flags); | |
2410 | result = __le16_to_cpu(rsp->result); | |
2411 | ||
af05b30b GP |
2412 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2413 | scid, flags, result); | |
1da177e4 | 2414 | |
baa7e1fa | 2415 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2416 | if (!chan) |
1da177e4 LT |
2417 | return 0; |
2418 | ||
48454079 GP |
2419 | sk = chan->sk; |
2420 | ||
1da177e4 LT |
2421 | switch (result) { |
2422 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2423 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2424 | break; |
2425 | ||
2426 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2427 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2428 | char req[64]; |
2429 | ||
c2c77ec8 | 2430 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2431 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2432 | goto done; |
2433 | } | |
2434 | ||
f2fcfcd6 GP |
2435 | /* throw out any old stored conf requests */ |
2436 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2437 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2438 | req, &result); | |
f2fcfcd6 | 2439 | if (len < 0) { |
e92c8e70 | 2440 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2441 | goto done; |
2442 | } | |
2443 | ||
2444 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2445 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2446 | chan->num_conf_req++; |
f2fcfcd6 GP |
2447 | if (result != L2CAP_CONF_SUCCESS) |
2448 | goto done; | |
2449 | break; | |
1da177e4 LT |
2450 | } |
2451 | ||
8e87d142 | 2452 | default: |
b1235d79 | 2453 | sk->sk_err = ECONNRESET; |
1da177e4 | 2454 | l2cap_sock_set_timer(sk, HZ * 5); |
e92c8e70 | 2455 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2456 | goto done; |
2457 | } | |
2458 | ||
2459 | if (flags & 0x01) | |
2460 | goto done; | |
2461 | ||
b4450035 | 2462 | chan->conf_state |= L2CAP_CONF_INPUT_DONE; |
1da177e4 | 2463 | |
b4450035 | 2464 | if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { |
47d1ec61 | 2465 | set_default_fcs(chan); |
fcc203c3 | 2466 | |
1da177e4 | 2467 | sk->sk_state = BT_CONNECTED; |
42e5c802 GP |
2468 | chan->next_tx_seq = 0; |
2469 | chan->expected_tx_seq = 0; | |
58d35f87 | 2470 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2471 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2472 | l2cap_ertm_init(chan); |
0565c1c2 | 2473 | |
1da177e4 LT |
2474 | l2cap_chan_ready(sk); |
2475 | } | |
2476 | ||
2477 | done: | |
2478 | bh_unlock_sock(sk); | |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2483 | { | |
2484 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2485 | struct l2cap_disconn_rsp rsp; | |
2486 | u16 dcid, scid; | |
48454079 | 2487 | struct l2cap_chan *chan; |
1da177e4 LT |
2488 | struct sock *sk; |
2489 | ||
2490 | scid = __le16_to_cpu(req->scid); | |
2491 | dcid = __le16_to_cpu(req->dcid); | |
2492 | ||
2493 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2494 | ||
baa7e1fa | 2495 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2496 | if (!chan) |
1da177e4 LT |
2497 | return 0; |
2498 | ||
48454079 GP |
2499 | sk = chan->sk; |
2500 | ||
fe4128e0 GP |
2501 | rsp.dcid = cpu_to_le16(chan->scid); |
2502 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2503 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2504 | ||
2505 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2506 | ||
a49184c2 AE |
2507 | /* don't delete l2cap channel if sk is owned by user */ |
2508 | if (sock_owned_by_user(sk)) { | |
2509 | sk->sk_state = BT_DISCONN; | |
2510 | l2cap_sock_clear_timer(sk); | |
2511 | l2cap_sock_set_timer(sk, HZ / 5); | |
2512 | bh_unlock_sock(sk); | |
2513 | return 0; | |
2514 | } | |
2515 | ||
48454079 | 2516 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2517 | bh_unlock_sock(sk); |
2518 | ||
2519 | l2cap_sock_kill(sk); | |
2520 | return 0; | |
2521 | } | |
2522 | ||
2523 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2524 | { | |
2525 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2526 | u16 dcid, scid; | |
48454079 | 2527 | struct l2cap_chan *chan; |
1da177e4 LT |
2528 | struct sock *sk; |
2529 | ||
2530 | scid = __le16_to_cpu(rsp->scid); | |
2531 | dcid = __le16_to_cpu(rsp->dcid); | |
2532 | ||
2533 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2534 | ||
baa7e1fa | 2535 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2536 | if (!chan) |
1da177e4 LT |
2537 | return 0; |
2538 | ||
48454079 GP |
2539 | sk = chan->sk; |
2540 | ||
a49184c2 AE |
2541 | /* don't delete l2cap channel if sk is owned by user */ |
2542 | if (sock_owned_by_user(sk)) { | |
2543 | sk->sk_state = BT_DISCONN; | |
2544 | l2cap_sock_clear_timer(sk); | |
2545 | l2cap_sock_set_timer(sk, HZ / 5); | |
2546 | bh_unlock_sock(sk); | |
2547 | return 0; | |
2548 | } | |
2549 | ||
48454079 | 2550 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2551 | bh_unlock_sock(sk); |
2552 | ||
2553 | l2cap_sock_kill(sk); | |
2554 | return 0; | |
2555 | } | |
2556 | ||
2557 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2558 | { | |
2559 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2560 | u16 type; |
2561 | ||
2562 | type = __le16_to_cpu(req->type); | |
2563 | ||
2564 | BT_DBG("type 0x%4.4x", type); | |
2565 | ||
f0709e03 MH |
2566 | if (type == L2CAP_IT_FEAT_MASK) { |
2567 | u8 buf[8]; | |
44dd46de | 2568 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2569 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2570 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2571 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2572 | if (!disable_ertm) |
fcc203c3 GP |
2573 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2574 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2575 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2576 | l2cap_send_cmd(conn, cmd->ident, |
2577 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2578 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2579 | u8 buf[12]; | |
2580 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2581 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2582 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2583 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2584 | l2cap_send_cmd(conn, cmd->ident, | |
2585 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2586 | } else { |
2587 | struct l2cap_info_rsp rsp; | |
2588 | rsp.type = cpu_to_le16(type); | |
2589 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2590 | l2cap_send_cmd(conn, cmd->ident, | |
2591 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2592 | } | |
1da177e4 LT |
2593 | |
2594 | return 0; | |
2595 | } | |
2596 | ||
2597 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2598 | { | |
2599 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2600 | u16 type, result; | |
2601 | ||
2602 | type = __le16_to_cpu(rsp->type); | |
2603 | result = __le16_to_cpu(rsp->result); | |
2604 | ||
2605 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2606 | ||
e90165be AE |
2607 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2608 | if (cmd->ident != conn->info_ident || | |
2609 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2610 | return 0; | |
2611 | ||
4e8402a3 MH |
2612 | del_timer(&conn->info_timer); |
2613 | ||
adb08ede VT |
2614 | if (result != L2CAP_IR_SUCCESS) { |
2615 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2616 | conn->info_ident = 0; | |
2617 | ||
2618 | l2cap_conn_start(conn); | |
2619 | ||
2620 | return 0; | |
2621 | } | |
2622 | ||
984947dc | 2623 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2624 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2625 | |
47ec1dcd | 2626 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2627 | struct l2cap_info_req req; |
2628 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2629 | ||
2630 | conn->info_ident = l2cap_get_ident(conn); | |
2631 | ||
2632 | l2cap_send_cmd(conn, conn->info_ident, | |
2633 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2634 | } else { | |
2635 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2636 | conn->info_ident = 0; | |
2637 | ||
2638 | l2cap_conn_start(conn); | |
2639 | } | |
2640 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2641 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2642 | conn->info_ident = 0; |
984947dc MH |
2643 | |
2644 | l2cap_conn_start(conn); | |
2645 | } | |
4e8402a3 | 2646 | |
1da177e4 LT |
2647 | return 0; |
2648 | } | |
2649 | ||
e2174ca4 | 2650 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2651 | u16 to_multiplier) |
2652 | { | |
2653 | u16 max_latency; | |
2654 | ||
2655 | if (min > max || min < 6 || max > 3200) | |
2656 | return -EINVAL; | |
2657 | ||
2658 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2659 | return -EINVAL; | |
2660 | ||
2661 | if (max >= to_multiplier * 8) | |
2662 | return -EINVAL; | |
2663 | ||
2664 | max_latency = (to_multiplier * 8 / max) - 1; | |
2665 | if (latency > 499 || latency > max_latency) | |
2666 | return -EINVAL; | |
2667 | ||
2668 | return 0; | |
2669 | } | |
2670 | ||
2671 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2672 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2673 | { | |
2674 | struct hci_conn *hcon = conn->hcon; | |
2675 | struct l2cap_conn_param_update_req *req; | |
2676 | struct l2cap_conn_param_update_rsp rsp; | |
2677 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2678 | int err; |
de73115a CT |
2679 | |
2680 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2681 | return -EINVAL; | |
2682 | ||
2683 | cmd_len = __le16_to_cpu(cmd->len); | |
2684 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2685 | return -EPROTO; | |
2686 | ||
2687 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2688 | min = __le16_to_cpu(req->min); |
2689 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2690 | latency = __le16_to_cpu(req->latency); |
2691 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2692 | ||
2693 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2694 | min, max, latency, to_multiplier); | |
2695 | ||
2696 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2697 | |
2698 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2699 | if (err) | |
de73115a CT |
2700 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2701 | else | |
2702 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2703 | ||
2704 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2705 | sizeof(rsp), &rsp); | |
2706 | ||
2ce603eb CT |
2707 | if (!err) |
2708 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2709 | ||
de73115a CT |
2710 | return 0; |
2711 | } | |
2712 | ||
3300d9a9 CT |
2713 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2714 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2715 | { | |
2716 | int err = 0; | |
2717 | ||
2718 | switch (cmd->code) { | |
2719 | case L2CAP_COMMAND_REJ: | |
2720 | l2cap_command_rej(conn, cmd, data); | |
2721 | break; | |
2722 | ||
2723 | case L2CAP_CONN_REQ: | |
2724 | err = l2cap_connect_req(conn, cmd, data); | |
2725 | break; | |
2726 | ||
2727 | case L2CAP_CONN_RSP: | |
2728 | err = l2cap_connect_rsp(conn, cmd, data); | |
2729 | break; | |
2730 | ||
2731 | case L2CAP_CONF_REQ: | |
2732 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2733 | break; | |
2734 | ||
2735 | case L2CAP_CONF_RSP: | |
2736 | err = l2cap_config_rsp(conn, cmd, data); | |
2737 | break; | |
2738 | ||
2739 | case L2CAP_DISCONN_REQ: | |
2740 | err = l2cap_disconnect_req(conn, cmd, data); | |
2741 | break; | |
2742 | ||
2743 | case L2CAP_DISCONN_RSP: | |
2744 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2745 | break; | |
2746 | ||
2747 | case L2CAP_ECHO_REQ: | |
2748 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2749 | break; | |
2750 | ||
2751 | case L2CAP_ECHO_RSP: | |
2752 | break; | |
2753 | ||
2754 | case L2CAP_INFO_REQ: | |
2755 | err = l2cap_information_req(conn, cmd, data); | |
2756 | break; | |
2757 | ||
2758 | case L2CAP_INFO_RSP: | |
2759 | err = l2cap_information_rsp(conn, cmd, data); | |
2760 | break; | |
2761 | ||
2762 | default: | |
2763 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2764 | err = -EINVAL; | |
2765 | break; | |
2766 | } | |
2767 | ||
2768 | return err; | |
2769 | } | |
2770 | ||
2771 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2772 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2773 | { | |
2774 | switch (cmd->code) { | |
2775 | case L2CAP_COMMAND_REJ: | |
2776 | return 0; | |
2777 | ||
2778 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2779 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2780 | |
2781 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2782 | return 0; | |
2783 | ||
2784 | default: | |
2785 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2786 | return -EINVAL; | |
2787 | } | |
2788 | } | |
2789 | ||
2790 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2791 | struct sk_buff *skb) | |
1da177e4 LT |
2792 | { |
2793 | u8 *data = skb->data; | |
2794 | int len = skb->len; | |
2795 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2796 | int err; |
1da177e4 LT |
2797 | |
2798 | l2cap_raw_recv(conn, skb); | |
2799 | ||
2800 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2801 | u16 cmd_len; |
1da177e4 LT |
2802 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2803 | data += L2CAP_CMD_HDR_SIZE; | |
2804 | len -= L2CAP_CMD_HDR_SIZE; | |
2805 | ||
88219a0f | 2806 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2807 | |
88219a0f | 2808 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2809 | |
88219a0f | 2810 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2811 | BT_DBG("corrupted command"); |
2812 | break; | |
2813 | } | |
2814 | ||
3300d9a9 CT |
2815 | if (conn->hcon->type == LE_LINK) |
2816 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2817 | else | |
2818 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2819 | |
2820 | if (err) { | |
2821 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
2822 | |
2823 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
2824 | |
2825 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2826 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2827 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2828 | } | |
2829 | ||
88219a0f AV |
2830 | data += cmd_len; |
2831 | len -= cmd_len; | |
1da177e4 LT |
2832 | } |
2833 | ||
2834 | kfree_skb(skb); | |
2835 | } | |
2836 | ||
47d1ec61 | 2837 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
2838 | { |
2839 | u16 our_fcs, rcv_fcs; | |
2840 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2841 | ||
47d1ec61 | 2842 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
2843 | skb_trim(skb, skb->len - 2); |
2844 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2845 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2846 | ||
2847 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2848 | return -EBADMSG; |
fcc203c3 GP |
2849 | } |
2850 | return 0; | |
2851 | } | |
2852 | ||
525cd185 | 2853 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 2854 | { |
d5392c8f GP |
2855 | u16 control = 0; |
2856 | ||
6a026610 | 2857 | chan->frames_sent = 0; |
d5392c8f | 2858 | |
42e5c802 | 2859 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 2860 | |
525cd185 | 2861 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
64988868 | 2862 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
2863 | l2cap_send_sframe(chan, control); |
2864 | chan->conn_state |= L2CAP_CONN_RNR_SENT; | |
d5392c8f GP |
2865 | } |
2866 | ||
525cd185 GP |
2867 | if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2868 | l2cap_retransmit_frames(chan); | |
d5392c8f | 2869 | |
525cd185 | 2870 | l2cap_ertm_send(chan); |
d5392c8f | 2871 | |
525cd185 | 2872 | if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && |
6a026610 | 2873 | chan->frames_sent == 0) { |
d5392c8f | 2874 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 2875 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
2876 | } |
2877 | } | |
2878 | ||
42e5c802 | 2879 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2880 | { |
2881 | struct sk_buff *next_skb; | |
bfbacc11 | 2882 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
2883 | |
2884 | bt_cb(skb)->tx_seq = tx_seq; | |
2885 | bt_cb(skb)->sar = sar; | |
2886 | ||
f1c6775b | 2887 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 2888 | if (!next_skb) { |
f1c6775b | 2889 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 2890 | return 0; |
8f17154f GP |
2891 | } |
2892 | ||
42e5c802 | 2893 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2894 | if (tx_seq_offset < 0) |
2895 | tx_seq_offset += 64; | |
2896 | ||
8f17154f | 2897 | do { |
9b53350d JPRV |
2898 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2899 | return -EINVAL; | |
2900 | ||
bfbacc11 | 2901 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 2902 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2903 | if (next_tx_seq_offset < 0) |
2904 | next_tx_seq_offset += 64; | |
2905 | ||
2906 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 2907 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 2908 | return 0; |
8f17154f GP |
2909 | } |
2910 | ||
f1c6775b | 2911 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
2912 | break; |
2913 | ||
f1c6775b | 2914 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 2915 | |
f1c6775b | 2916 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
2917 | |
2918 | return 0; | |
8f17154f GP |
2919 | } |
2920 | ||
525cd185 | 2921 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 2922 | { |
18778a63 | 2923 | struct sk_buff *_skb; |
1890d36b | 2924 | int err; |
18778a63 GP |
2925 | |
2926 | switch (control & L2CAP_CTRL_SAR) { | |
2927 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 2928 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2929 | goto drop; |
2930 | ||
224f8af0 | 2931 | return sock_queue_rcv_skb(chan->sk, skb); |
18778a63 GP |
2932 | |
2933 | case L2CAP_SDU_START: | |
525cd185 | 2934 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2935 | goto drop; |
2936 | ||
6f61fd47 | 2937 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 2938 | |
0c1bc5c6 | 2939 | if (chan->sdu_len > chan->imtu) |
18778a63 GP |
2940 | goto disconnect; |
2941 | ||
6f61fd47 GP |
2942 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
2943 | if (!chan->sdu) | |
1890d36b GP |
2944 | return -ENOMEM; |
2945 | ||
2946 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2947 | * condition we have to be sure that this will be executed | |
2948 | * only once, i.e., when alloc does not fail */ | |
2949 | skb_pull(skb, 2); | |
18778a63 | 2950 | |
6f61fd47 | 2951 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 2952 | |
525cd185 | 2953 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 2954 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
2955 | break; |
2956 | ||
2957 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 2958 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2959 | goto disconnect; |
2960 | ||
6f61fd47 | 2961 | if (!chan->sdu) |
18778a63 GP |
2962 | goto disconnect; |
2963 | ||
6f61fd47 GP |
2964 | chan->partial_sdu_len += skb->len; |
2965 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
2966 | goto drop; |
2967 | ||
6f61fd47 | 2968 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 2969 | |
18778a63 GP |
2970 | break; |
2971 | ||
2972 | case L2CAP_SDU_END: | |
525cd185 | 2973 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2974 | goto disconnect; |
2975 | ||
6f61fd47 | 2976 | if (!chan->sdu) |
18778a63 GP |
2977 | goto disconnect; |
2978 | ||
525cd185 | 2979 | if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { |
6f61fd47 | 2980 | chan->partial_sdu_len += skb->len; |
18778a63 | 2981 | |
0c1bc5c6 | 2982 | if (chan->partial_sdu_len > chan->imtu) |
1890d36b | 2983 | goto drop; |
18778a63 | 2984 | |
6f61fd47 | 2985 | if (chan->partial_sdu_len != chan->sdu_len) |
1890d36b | 2986 | goto drop; |
4178ba46 | 2987 | |
6f61fd47 | 2988 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
1890d36b | 2989 | } |
18778a63 | 2990 | |
6f61fd47 | 2991 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 2992 | if (!_skb) { |
525cd185 | 2993 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2994 | return -ENOMEM; |
2995 | } | |
2996 | ||
525cd185 | 2997 | err = sock_queue_rcv_skb(chan->sk, _skb); |
1890d36b | 2998 | if (err < 0) { |
18778a63 | 2999 | kfree_skb(_skb); |
525cd185 | 3000 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
3001 | return err; |
3002 | } | |
3003 | ||
525cd185 GP |
3004 | chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; |
3005 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 | 3006 | |
6f61fd47 | 3007 | kfree_skb(chan->sdu); |
18778a63 GP |
3008 | break; |
3009 | } | |
3010 | ||
3011 | kfree_skb(skb); | |
1890d36b | 3012 | return 0; |
18778a63 GP |
3013 | |
3014 | drop: | |
6f61fd47 GP |
3015 | kfree_skb(chan->sdu); |
3016 | chan->sdu = NULL; | |
18778a63 GP |
3017 | |
3018 | disconnect: | |
8c1d787b | 3019 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
18778a63 GP |
3020 | kfree_skb(skb); |
3021 | return 0; | |
3022 | } | |
3023 | ||
525cd185 | 3024 | static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) |
712132eb | 3025 | { |
712132eb GP |
3026 | struct sk_buff *skb; |
3027 | u16 control; | |
3028 | int err; | |
3029 | ||
f1c6775b | 3030 | while ((skb = skb_dequeue(&chan->busy_q))) { |
712132eb | 3031 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3032 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
712132eb | 3033 | if (err < 0) { |
f1c6775b | 3034 | skb_queue_head(&chan->busy_q, skb); |
712132eb GP |
3035 | return -EBUSY; |
3036 | } | |
3037 | ||
42e5c802 | 3038 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
712132eb GP |
3039 | } |
3040 | ||
525cd185 | 3041 | if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) |
712132eb GP |
3042 | goto done; |
3043 | ||
42e5c802 | 3044 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 3045 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 3046 | l2cap_send_sframe(chan, control); |
6a026610 | 3047 | chan->retry_count = 1; |
712132eb | 3048 | |
e92c8e70 | 3049 | del_timer(&chan->retrans_timer); |
712132eb GP |
3050 | __mod_monitor_timer(); |
3051 | ||
525cd185 | 3052 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
712132eb GP |
3053 | |
3054 | done: | |
525cd185 GP |
3055 | chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; |
3056 | chan->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
712132eb | 3057 | |
49208c9c | 3058 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3059 | |
3060 | return 0; | |
3061 | } | |
3062 | ||
1890d36b GP |
3063 | static void l2cap_busy_work(struct work_struct *work) |
3064 | { | |
3065 | DECLARE_WAITQUEUE(wait, current); | |
311bb895 GP |
3066 | struct l2cap_chan *chan = |
3067 | container_of(work, struct l2cap_chan, busy_work); | |
3068 | struct sock *sk = chan->sk; | |
1890d36b GP |
3069 | int n_tries = 0, timeo = HZ/5, err; |
3070 | struct sk_buff *skb; | |
1890d36b GP |
3071 | |
3072 | lock_sock(sk); | |
3073 | ||
2b0b05dd | 3074 | add_wait_queue(sk_sleep(sk), &wait); |
311bb895 | 3075 | while ((skb = skb_peek(&chan->busy_q))) { |
1890d36b GP |
3076 | set_current_state(TASK_INTERRUPTIBLE); |
3077 | ||
3078 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3079 | err = -EBUSY; | |
8c1d787b | 3080 | l2cap_send_disconn_req(chan->conn, chan, EBUSY); |
712132eb | 3081 | break; |
1890d36b GP |
3082 | } |
3083 | ||
3084 | if (!timeo) | |
3085 | timeo = HZ/5; | |
3086 | ||
3087 | if (signal_pending(current)) { | |
3088 | err = sock_intr_errno(timeo); | |
712132eb | 3089 | break; |
1890d36b GP |
3090 | } |
3091 | ||
3092 | release_sock(sk); | |
3093 | timeo = schedule_timeout(timeo); | |
3094 | lock_sock(sk); | |
3095 | ||
3096 | err = sock_error(sk); | |
3097 | if (err) | |
712132eb | 3098 | break; |
1890d36b | 3099 | |
311bb895 | 3100 | if (l2cap_try_push_rx_skb(chan) == 0) |
1890d36b GP |
3101 | break; |
3102 | } | |
3103 | ||
1890d36b | 3104 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3105 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3106 | |
3107 | release_sock(sk); | |
3108 | } | |
3109 | ||
525cd185 | 3110 | static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
1890d36b | 3111 | { |
1890d36b GP |
3112 | int sctrl, err; |
3113 | ||
525cd185 | 3114 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
1890d36b | 3115 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3116 | __skb_queue_tail(&chan->busy_q, skb); |
525cd185 | 3117 | return l2cap_try_push_rx_skb(chan); |
712132eb GP |
3118 | |
3119 | ||
1890d36b GP |
3120 | } |
3121 | ||
525cd185 | 3122 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
1890d36b | 3123 | if (err >= 0) { |
42e5c802 | 3124 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
1890d36b GP |
3125 | return err; |
3126 | } | |
3127 | ||
3128 | /* Busy Condition */ | |
311bb895 | 3129 | BT_DBG("chan %p, Enter local busy", chan); |
0e98958d | 3130 | |
525cd185 | 3131 | chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
1890d36b | 3132 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3133 | __skb_queue_tail(&chan->busy_q, skb); |
1890d36b | 3134 | |
42e5c802 | 3135 | sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1890d36b | 3136 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3137 | l2cap_send_sframe(chan, sctrl); |
1890d36b | 3138 | |
525cd185 | 3139 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 3140 | |
e92c8e70 | 3141 | del_timer(&chan->ack_timer); |
7fe9b298 | 3142 | |
311bb895 | 3143 | queue_work(_busy_wq, &chan->busy_work); |
1890d36b GP |
3144 | |
3145 | return err; | |
3146 | } | |
3147 | ||
525cd185 | 3148 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3149 | { |
c74e560c GP |
3150 | struct sk_buff *_skb; |
3151 | int err = -EINVAL; | |
3152 | ||
18778a63 GP |
3153 | /* |
3154 | * TODO: We have to notify the userland if some data is lost with the | |
3155 | * Streaming Mode. | |
3156 | */ | |
3157 | ||
c74e560c GP |
3158 | switch (control & L2CAP_CTRL_SAR) { |
3159 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3160 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3161 | kfree_skb(chan->sdu); |
c74e560c GP |
3162 | break; |
3163 | } | |
3164 | ||
525cd185 | 3165 | err = sock_queue_rcv_skb(chan->sk, skb); |
c74e560c GP |
3166 | if (!err) |
3167 | return 0; | |
3168 | ||
3169 | break; | |
3170 | ||
3171 | case L2CAP_SDU_START: | |
525cd185 | 3172 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3173 | kfree_skb(chan->sdu); |
c74e560c GP |
3174 | break; |
3175 | } | |
3176 | ||
6f61fd47 | 3177 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3178 | skb_pull(skb, 2); |
3179 | ||
0c1bc5c6 | 3180 | if (chan->sdu_len > chan->imtu) { |
052897ca GP |
3181 | err = -EMSGSIZE; |
3182 | break; | |
3183 | } | |
3184 | ||
6f61fd47 GP |
3185 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3186 | if (!chan->sdu) { | |
c74e560c GP |
3187 | err = -ENOMEM; |
3188 | break; | |
3189 | } | |
3190 | ||
6f61fd47 | 3191 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3192 | |
525cd185 | 3193 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3194 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3195 | err = 0; |
3196 | break; | |
3197 | ||
3198 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3199 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3200 | break; |
3201 | ||
6f61fd47 | 3202 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3203 | |
6f61fd47 GP |
3204 | chan->partial_sdu_len += skb->len; |
3205 | if (chan->partial_sdu_len > chan->sdu_len) | |
3206 | kfree_skb(chan->sdu); | |
c74e560c GP |
3207 | else |
3208 | err = 0; | |
3209 | ||
3210 | break; | |
3211 | ||
3212 | case L2CAP_SDU_END: | |
525cd185 | 3213 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3214 | break; |
3215 | ||
6f61fd47 | 3216 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3217 | |
525cd185 | 3218 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3219 | chan->partial_sdu_len += skb->len; |
c74e560c | 3220 | |
0c1bc5c6 | 3221 | if (chan->partial_sdu_len > chan->imtu) |
36f2fd58 GP |
3222 | goto drop; |
3223 | ||
6f61fd47 GP |
3224 | if (chan->partial_sdu_len == chan->sdu_len) { |
3225 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
525cd185 | 3226 | err = sock_queue_rcv_skb(chan->sk, _skb); |
c74e560c GP |
3227 | if (err < 0) |
3228 | kfree_skb(_skb); | |
3229 | } | |
c74e560c GP |
3230 | err = 0; |
3231 | ||
36f2fd58 | 3232 | drop: |
6f61fd47 | 3233 | kfree_skb(chan->sdu); |
c74e560c GP |
3234 | break; |
3235 | } | |
3236 | ||
3237 | kfree_skb(skb); | |
3238 | return err; | |
3239 | } | |
3240 | ||
525cd185 | 3241 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3242 | { |
3243 | struct sk_buff *skb; | |
afefdbc4 | 3244 | u16 control; |
8f17154f | 3245 | |
f1c6775b | 3246 | while ((skb = skb_peek(&chan->srej_q))) { |
8f17154f GP |
3247 | if (bt_cb(skb)->tx_seq != tx_seq) |
3248 | break; | |
3249 | ||
f1c6775b | 3250 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3251 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3252 | l2cap_ertm_reassembly_sdu(chan, skb, control); |
42e5c802 GP |
3253 | chan->buffer_seq_srej = |
3254 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3255 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3256 | } |
3257 | } | |
3258 | ||
525cd185 | 3259 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3260 | { |
8f17154f GP |
3261 | struct srej_list *l, *tmp; |
3262 | u16 control; | |
3263 | ||
39d5a3ee | 3264 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3265 | if (l->tx_seq == tx_seq) { |
3266 | list_del(&l->list); | |
3267 | kfree(l); | |
3268 | return; | |
3269 | } | |
3270 | control = L2CAP_SUPER_SELECT_REJECT; | |
3271 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3272 | l2cap_send_sframe(chan, control); |
8f17154f | 3273 | list_del(&l->list); |
39d5a3ee | 3274 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3275 | } |
3276 | } | |
3277 | ||
525cd185 | 3278 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3279 | { |
8f17154f GP |
3280 | struct srej_list *new; |
3281 | u16 control; | |
3282 | ||
42e5c802 | 3283 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3284 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3285 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3286 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3287 | |
3288 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3289 | new->tx_seq = chan->expected_tx_seq; |
3290 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3291 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3292 | } |
42e5c802 | 3293 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3294 | } |
3295 | ||
525cd185 | 3296 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3297 | { |
1c2acffb | 3298 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3299 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3300 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3301 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3302 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3303 | int err = 0; |
3304 | ||
525cd185 GP |
3305 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3306 | tx_seq, rx_control); | |
1c2acffb | 3307 | |
9b16dc65 | 3308 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3309 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3310 | del_timer(&chan->monitor_timer); |
6a026610 | 3311 | if (chan->unacked_frames > 0) |
1d8f5d16 | 3312 | __mod_retrans_timer(); |
525cd185 | 3313 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
1d8f5d16 GP |
3314 | } |
3315 | ||
42e5c802 GP |
3316 | chan->expected_ack_seq = req_seq; |
3317 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3318 | |
42e5c802 | 3319 | if (tx_seq == chan->expected_tx_seq) |
8f17154f | 3320 | goto expected; |
1c2acffb | 3321 | |
42e5c802 | 3322 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3323 | if (tx_seq_offset < 0) |
3324 | tx_seq_offset += 64; | |
3325 | ||
3326 | /* invalid tx_seq */ | |
47d1ec61 | 3327 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3328 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3329 | goto drop; |
3330 | } | |
3331 | ||
525cd185 | 3332 | if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) |
1890d36b GP |
3333 | goto drop; |
3334 | ||
525cd185 | 3335 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
8f17154f | 3336 | struct srej_list *first; |
30afb5b2 | 3337 | |
39d5a3ee | 3338 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3339 | struct srej_list, list); |
3340 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3341 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3342 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3343 | |
3344 | list_del(&first->list); | |
3345 | kfree(first); | |
3346 | ||
39d5a3ee | 3347 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3348 | chan->buffer_seq = chan->buffer_seq_srej; |
525cd185 GP |
3349 | chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3350 | l2cap_send_ack(chan); | |
49208c9c | 3351 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3352 | } |
3353 | } else { | |
3354 | struct srej_list *l; | |
9b53350d JPRV |
3355 | |
3356 | /* duplicated tx_seq */ | |
42e5c802 | 3357 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3358 | goto drop; |
8f17154f | 3359 | |
39d5a3ee | 3360 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3361 | if (l->tx_seq == tx_seq) { |
525cd185 | 3362 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3363 | return 0; |
3364 | } | |
3365 | } | |
525cd185 | 3366 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3367 | } |
3368 | } else { | |
9b53350d | 3369 | expected_tx_seq_offset = |
42e5c802 | 3370 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3371 | if (expected_tx_seq_offset < 0) |
3372 | expected_tx_seq_offset += 64; | |
3373 | ||
3374 | /* duplicated tx_seq */ | |
3375 | if (tx_seq_offset < expected_tx_seq_offset) | |
3376 | goto drop; | |
3377 | ||
525cd185 | 3378 | chan->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3379 | |
49208c9c | 3380 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3381 | |
39d5a3ee | 3382 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3383 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3384 | |
f1c6775b GP |
3385 | __skb_queue_head_init(&chan->srej_q); |
3386 | __skb_queue_head_init(&chan->busy_q); | |
42e5c802 | 3387 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3388 | |
525cd185 | 3389 | chan->conn_state |= L2CAP_CONN_SEND_PBIT; |
ef54fd93 | 3390 | |
525cd185 | 3391 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3392 | |
e92c8e70 | 3393 | del_timer(&chan->ack_timer); |
1c2acffb | 3394 | } |
30afb5b2 GP |
3395 | return 0; |
3396 | ||
8f17154f | 3397 | expected: |
42e5c802 | 3398 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3399 | |
525cd185 | 3400 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
3b1a9f3f GP |
3401 | bt_cb(skb)->tx_seq = tx_seq; |
3402 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3403 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3404 | return 0; |
3405 | } | |
3406 | ||
525cd185 | 3407 | err = l2cap_push_rx_skb(chan, skb, rx_control); |
2ece3684 GP |
3408 | if (err < 0) |
3409 | return 0; | |
3410 | ||
4ec10d97 | 3411 | if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 GP |
3412 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3413 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3414 | else |
525cd185 | 3415 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3416 | } |
3417 | ||
c1b4f43b GP |
3418 | __mod_ack_timer(); |
3419 | ||
6a026610 GP |
3420 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3421 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3422 | l2cap_send_ack(chan); |
9e917af1 | 3423 | |
8f17154f | 3424 | return 0; |
9b53350d JPRV |
3425 | |
3426 | drop: | |
3427 | kfree_skb(skb); | |
3428 | return 0; | |
1c2acffb GP |
3429 | } |
3430 | ||
525cd185 | 3431 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3432 | { |
49208c9c | 3433 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3434 | rx_control); |
3435 | ||
42e5c802 GP |
3436 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3437 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3438 | |
e072745f | 3439 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 GP |
3440 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3441 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3442 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
6a026610 | 3443 | (chan->unacked_frames > 0)) |
05fbd89d GP |
3444 | __mod_retrans_timer(); |
3445 | ||
525cd185 GP |
3446 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3447 | l2cap_send_srejtail(chan); | |
05fbd89d | 3448 | } else { |
525cd185 | 3449 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3450 | } |
1d8f5d16 | 3451 | |
e072745f | 3452 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3453 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4ec10d97 | 3454 | |
525cd185 GP |
3455 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3456 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3457 | else |
525cd185 | 3458 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3459 | |
e072745f | 3460 | } else { |
525cd185 | 3461 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
6a026610 | 3462 | (chan->unacked_frames > 0)) |
e072745f | 3463 | __mod_retrans_timer(); |
1c2acffb | 3464 | |
525cd185 GP |
3465 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3466 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) | |
3467 | l2cap_send_ack(chan); | |
894718a6 | 3468 | else |
525cd185 | 3469 | l2cap_ertm_send(chan); |
e072745f GP |
3470 | } |
3471 | } | |
2246b2f1 | 3472 | |
525cd185 | 3473 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3474 | { |
e072745f | 3475 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3476 | |
525cd185 | 3477 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3478 | |
525cd185 | 3479 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f | 3480 | |
42e5c802 GP |
3481 | chan->expected_ack_seq = tx_seq; |
3482 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3483 | |
3484 | if (rx_control & L2CAP_CTRL_FINAL) { | |
525cd185 GP |
3485 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3486 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3487 | else |
525cd185 | 3488 | l2cap_retransmit_frames(chan); |
e072745f | 3489 | } else { |
525cd185 | 3490 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3491 | |
525cd185 GP |
3492 | if (chan->conn_state & L2CAP_CONN_WAIT_F) |
3493 | chan->conn_state |= L2CAP_CONN_REJ_ACT; | |
e072745f GP |
3494 | } |
3495 | } | |
525cd185 | 3496 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3497 | { |
e072745f | 3498 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3499 | |
525cd185 | 3500 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3501 | |
525cd185 | 3502 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3503 | |
e072745f | 3504 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3505 | chan->expected_ack_seq = tx_seq; |
3506 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3507 | |
525cd185 GP |
3508 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3509 | l2cap_retransmit_one_frame(chan, tx_seq); | |
dfc909be | 3510 | |
525cd185 | 3511 | l2cap_ertm_send(chan); |
dfc909be | 3512 | |
525cd185 | 3513 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { |
6a026610 | 3514 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3515 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3516 | } |
e072745f | 3517 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3518 | if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && |
6a026610 | 3519 | chan->srej_save_reqseq == tx_seq) |
525cd185 | 3520 | chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
e072745f | 3521 | else |
525cd185 | 3522 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3523 | } else { |
525cd185 GP |
3524 | l2cap_retransmit_one_frame(chan, tx_seq); |
3525 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { | |
6a026610 | 3526 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3527 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3528 | } |
e072745f GP |
3529 | } |
3530 | } | |
3531 | ||
525cd185 | 3532 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3533 | { |
e072745f GP |
3534 | u8 tx_seq = __get_reqseq(rx_control); |
3535 | ||
525cd185 | 3536 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3537 | |
525cd185 | 3538 | chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
42e5c802 GP |
3539 | chan->expected_ack_seq = tx_seq; |
3540 | l2cap_drop_acked_frames(chan); | |
e072745f | 3541 | |
3cb123d1 | 3542 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3543 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 3544 | |
525cd185 | 3545 | if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { |
e92c8e70 | 3546 | del_timer(&chan->retrans_timer); |
a2e12a2a | 3547 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3548 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3549 | return; |
e072745f | 3550 | } |
99b0d4b7 GP |
3551 | |
3552 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3553 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3554 | else |
525cd185 | 3555 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3556 | } |
3557 | ||
525cd185 | 3558 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3559 | { |
525cd185 | 3560 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3561 | |
9b16dc65 | 3562 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3563 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3564 | del_timer(&chan->monitor_timer); |
6a026610 | 3565 | if (chan->unacked_frames > 0) |
e072745f | 3566 | __mod_retrans_timer(); |
525cd185 | 3567 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
e072745f GP |
3568 | } |
3569 | ||
3570 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3571 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3572 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3573 | break; |
3574 | ||
e072745f | 3575 | case L2CAP_SUPER_REJECT: |
525cd185 | 3576 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3577 | break; |
2246b2f1 | 3578 | |
e072745f | 3579 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3580 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3581 | break; |
3582 | ||
3583 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3584 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3585 | break; |
3586 | } | |
3587 | ||
faaebd19 | 3588 | kfree_skb(skb); |
1c2acffb GP |
3589 | return 0; |
3590 | } | |
3591 | ||
218bb9df GP |
3592 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3593 | { | |
525cd185 | 3594 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3595 | u16 control; |
3596 | u8 req_seq; | |
3597 | int len, next_tx_seq_offset, req_seq_offset; | |
3598 | ||
3599 | control = get_unaligned_le16(skb->data); | |
3600 | skb_pull(skb, 2); | |
3601 | len = skb->len; | |
3602 | ||
3603 | /* | |
3604 | * We can just drop the corrupted I-frame here. | |
3605 | * Receiver will miss it and start proper recovery | |
3606 | * procedures and ask retransmission. | |
3607 | */ | |
47d1ec61 | 3608 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3609 | goto drop; |
3610 | ||
3611 | if (__is_sar_start(control) && __is_iframe(control)) | |
3612 | len -= 2; | |
3613 | ||
47d1ec61 | 3614 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3615 | len -= 2; |
3616 | ||
47d1ec61 | 3617 | if (len > chan->mps) { |
8c1d787b | 3618 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3619 | goto drop; |
3620 | } | |
3621 | ||
3622 | req_seq = __get_reqseq(control); | |
42e5c802 | 3623 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3624 | if (req_seq_offset < 0) |
3625 | req_seq_offset += 64; | |
3626 | ||
3627 | next_tx_seq_offset = | |
42e5c802 | 3628 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3629 | if (next_tx_seq_offset < 0) |
3630 | next_tx_seq_offset += 64; | |
3631 | ||
3632 | /* check for invalid req-seq */ | |
3633 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 3634 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3635 | goto drop; |
3636 | } | |
3637 | ||
3638 | if (__is_iframe(control)) { | |
3639 | if (len < 0) { | |
8c1d787b | 3640 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3641 | goto drop; |
3642 | } | |
3643 | ||
525cd185 | 3644 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3645 | } else { |
3646 | if (len != 0) { | |
3647 | BT_ERR("%d", len); | |
8c1d787b | 3648 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
3649 | goto drop; |
3650 | } | |
3651 | ||
525cd185 | 3652 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3653 | } |
3654 | ||
3655 | return 0; | |
3656 | ||
3657 | drop: | |
3658 | kfree_skb(skb); | |
3659 | return 0; | |
3660 | } | |
3661 | ||
1da177e4 LT |
3662 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3663 | { | |
48454079 | 3664 | struct l2cap_chan *chan; |
bf734843 | 3665 | struct sock *sk = NULL; |
51893f88 | 3666 | u16 control; |
218bb9df GP |
3667 | u8 tx_seq; |
3668 | int len; | |
1da177e4 | 3669 | |
baa7e1fa | 3670 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3671 | if (!chan) { |
1da177e4 LT |
3672 | BT_DBG("unknown cid 0x%4.4x", cid); |
3673 | goto drop; | |
3674 | } | |
3675 | ||
48454079 | 3676 | sk = chan->sk; |
6840ed07 | 3677 | |
49208c9c | 3678 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 LT |
3679 | |
3680 | if (sk->sk_state != BT_CONNECTED) | |
3681 | goto drop; | |
3682 | ||
0c1bc5c6 | 3683 | switch (chan->mode) { |
1c2acffb GP |
3684 | case L2CAP_MODE_BASIC: |
3685 | /* If socket recv buffers overflows we drop data here | |
3686 | * which is *bad* because L2CAP has to be reliable. | |
3687 | * But we don't have any other choice. L2CAP doesn't | |
3688 | * provide flow control mechanism. */ | |
1da177e4 | 3689 | |
0c1bc5c6 | 3690 | if (chan->imtu < skb->len) |
1c2acffb | 3691 | goto drop; |
1da177e4 | 3692 | |
1c2acffb GP |
3693 | if (!sock_queue_rcv_skb(sk, skb)) |
3694 | goto done; | |
3695 | break; | |
3696 | ||
3697 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3698 | if (!sock_owned_by_user(sk)) { |
3699 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3700 | } else { |
218bb9df | 3701 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3702 | goto drop; |
277ffbe3 | 3703 | } |
1c2acffb | 3704 | |
fcafde2e | 3705 | goto done; |
1c2acffb | 3706 | |
6840ed07 GP |
3707 | case L2CAP_MODE_STREAMING: |
3708 | control = get_unaligned_le16(skb->data); | |
3709 | skb_pull(skb, 2); | |
3710 | len = skb->len; | |
3711 | ||
47d1ec61 | 3712 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3713 | goto drop; |
3714 | ||
6840ed07 GP |
3715 | if (__is_sar_start(control)) |
3716 | len -= 2; | |
3717 | ||
47d1ec61 | 3718 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3719 | len -= 2; |
3720 | ||
47d1ec61 | 3721 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3722 | goto drop; |
3723 | ||
3724 | tx_seq = __get_txseq(control); | |
3725 | ||
42e5c802 GP |
3726 | if (chan->expected_tx_seq == tx_seq) |
3727 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3728 | else |
42e5c802 | 3729 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3730 | |
525cd185 | 3731 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3732 | |
3733 | goto done; | |
3734 | ||
1c2acffb | 3735 | default: |
0c1bc5c6 | 3736 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3737 | break; |
3738 | } | |
1da177e4 LT |
3739 | |
3740 | drop: | |
3741 | kfree_skb(skb); | |
3742 | ||
3743 | done: | |
0139418c MH |
3744 | if (sk) |
3745 | bh_unlock_sock(sk); | |
3746 | ||
1da177e4 LT |
3747 | return 0; |
3748 | } | |
3749 | ||
8e036fc3 | 3750 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 3751 | { |
6dcae1ea | 3752 | struct sock *sk = NULL; |
23691d75 | 3753 | struct l2cap_chan *chan; |
1da177e4 | 3754 | |
23691d75 GP |
3755 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
3756 | if (!chan) | |
1da177e4 LT |
3757 | goto drop; |
3758 | ||
23691d75 GP |
3759 | sk = chan->sk; |
3760 | ||
e0f0cb56 GP |
3761 | bh_lock_sock(sk); |
3762 | ||
1da177e4 LT |
3763 | BT_DBG("sk %p, len %d", sk, skb->len); |
3764 | ||
3765 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3766 | goto drop; | |
3767 | ||
0c1bc5c6 | 3768 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
1da177e4 LT |
3769 | goto drop; |
3770 | ||
3771 | if (!sock_queue_rcv_skb(sk, skb)) | |
3772 | goto done; | |
3773 | ||
3774 | drop: | |
3775 | kfree_skb(skb); | |
3776 | ||
3777 | done: | |
af05b30b GP |
3778 | if (sk) |
3779 | bh_unlock_sock(sk); | |
1da177e4 LT |
3780 | return 0; |
3781 | } | |
3782 | ||
9f69bda6 GP |
3783 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3784 | { | |
6dcae1ea | 3785 | struct sock *sk = NULL; |
23691d75 | 3786 | struct l2cap_chan *chan; |
9f69bda6 | 3787 | |
23691d75 GP |
3788 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
3789 | if (!chan) | |
9f69bda6 GP |
3790 | goto drop; |
3791 | ||
23691d75 GP |
3792 | sk = chan->sk; |
3793 | ||
9f69bda6 GP |
3794 | bh_lock_sock(sk); |
3795 | ||
3796 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3797 | ||
3798 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3799 | goto drop; | |
3800 | ||
0c1bc5c6 | 3801 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
9f69bda6 GP |
3802 | goto drop; |
3803 | ||
3804 | if (!sock_queue_rcv_skb(sk, skb)) | |
3805 | goto done; | |
3806 | ||
3807 | drop: | |
3808 | kfree_skb(skb); | |
3809 | ||
3810 | done: | |
3811 | if (sk) | |
3812 | bh_unlock_sock(sk); | |
3813 | return 0; | |
3814 | } | |
3815 | ||
1da177e4 LT |
3816 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3817 | { | |
3818 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3819 | u16 cid, len; |
3820 | __le16 psm; | |
1da177e4 LT |
3821 | |
3822 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3823 | cid = __le16_to_cpu(lh->cid); | |
3824 | len = __le16_to_cpu(lh->len); | |
3825 | ||
1c2acffb GP |
3826 | if (len != skb->len) { |
3827 | kfree_skb(skb); | |
3828 | return; | |
3829 | } | |
3830 | ||
1da177e4 LT |
3831 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3832 | ||
3833 | switch (cid) { | |
3300d9a9 | 3834 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3835 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3836 | l2cap_sig_channel(conn, skb); |
3837 | break; | |
3838 | ||
8db4dc46 | 3839 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3840 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3841 | skb_pull(skb, 2); |
3842 | l2cap_conless_channel(conn, psm, skb); | |
3843 | break; | |
3844 | ||
9f69bda6 GP |
3845 | case L2CAP_CID_LE_DATA: |
3846 | l2cap_att_channel(conn, cid, skb); | |
3847 | break; | |
3848 | ||
1da177e4 LT |
3849 | default: |
3850 | l2cap_data_channel(conn, cid, skb); | |
3851 | break; | |
3852 | } | |
3853 | } | |
3854 | ||
3855 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3856 | ||
3857 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3858 | { | |
3859 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 3860 | struct l2cap_chan *c; |
1da177e4 LT |
3861 | |
3862 | if (type != ACL_LINK) | |
963cf687 | 3863 | return -EINVAL; |
1da177e4 LT |
3864 | |
3865 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3866 | ||
3867 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
3868 | read_lock(&chan_list_lock); |
3869 | list_for_each_entry(c, &chan_list, global_l) { | |
3870 | struct sock *sk = c->sk; | |
4343478f | 3871 | |
1da177e4 LT |
3872 | if (sk->sk_state != BT_LISTEN) |
3873 | continue; | |
3874 | ||
3875 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 3876 | lm1 |= HCI_LM_ACCEPT; |
23691d75 | 3877 | if (c->role_switch) |
2af6b9d5 | 3878 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 3879 | exact++; |
2af6b9d5 MH |
3880 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3881 | lm2 |= HCI_LM_ACCEPT; | |
23691d75 | 3882 | if (c->role_switch) |
2af6b9d5 MH |
3883 | lm2 |= HCI_LM_MASTER; |
3884 | } | |
1da177e4 | 3885 | } |
23691d75 | 3886 | read_unlock(&chan_list_lock); |
1da177e4 LT |
3887 | |
3888 | return exact ? lm1 : lm2; | |
3889 | } | |
3890 | ||
3891 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3892 | { | |
0139418c MH |
3893 | struct l2cap_conn *conn; |
3894 | ||
1da177e4 LT |
3895 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3896 | ||
acd7d370 | 3897 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3898 | return -EINVAL; |
1da177e4 LT |
3899 | |
3900 | if (!status) { | |
1da177e4 LT |
3901 | conn = l2cap_conn_add(hcon, status); |
3902 | if (conn) | |
3903 | l2cap_conn_ready(conn); | |
0139418c | 3904 | } else |
1da177e4 LT |
3905 | l2cap_conn_del(hcon, bt_err(status)); |
3906 | ||
3907 | return 0; | |
3908 | } | |
3909 | ||
2950f21a MH |
3910 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3911 | { | |
3912 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3913 | ||
3914 | BT_DBG("hcon %p", hcon); | |
3915 | ||
3916 | if (hcon->type != ACL_LINK || !conn) | |
3917 | return 0x13; | |
3918 | ||
3919 | return conn->disc_reason; | |
3920 | } | |
3921 | ||
3922 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3923 | { |
3924 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3925 | ||
acd7d370 | 3926 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3927 | return -EINVAL; |
1da177e4 LT |
3928 | |
3929 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3930 | |
1da177e4 LT |
3931 | return 0; |
3932 | } | |
3933 | ||
4343478f | 3934 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 3935 | { |
4343478f GP |
3936 | struct sock *sk = chan->sk; |
3937 | ||
bd3c9e25 | 3938 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3939 | return; |
3940 | ||
f62e4323 | 3941 | if (encrypt == 0x00) { |
4343478f | 3942 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
f62e4323 MH |
3943 | l2cap_sock_clear_timer(sk); |
3944 | l2cap_sock_set_timer(sk, HZ * 5); | |
4343478f | 3945 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
f62e4323 MH |
3946 | __l2cap_sock_close(sk, ECONNREFUSED); |
3947 | } else { | |
4343478f | 3948 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
f62e4323 MH |
3949 | l2cap_sock_clear_timer(sk); |
3950 | } | |
3951 | } | |
3952 | ||
8c1b2355 | 3953 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 3954 | { |
0139418c | 3955 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 3956 | struct l2cap_chan *chan; |
1da177e4 | 3957 | |
0139418c | 3958 | if (!conn) |
1da177e4 | 3959 | return 0; |
0139418c | 3960 | |
1da177e4 LT |
3961 | BT_DBG("conn %p", conn); |
3962 | ||
baa7e1fa | 3963 | read_lock(&conn->chan_lock); |
1da177e4 | 3964 | |
baa7e1fa | 3965 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 3966 | struct sock *sk = chan->sk; |
baa7e1fa | 3967 | |
1da177e4 LT |
3968 | bh_lock_sock(sk); |
3969 | ||
b4450035 | 3970 | if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { |
6a8d3010 MH |
3971 | bh_unlock_sock(sk); |
3972 | continue; | |
3973 | } | |
3974 | ||
f62e4323 | 3975 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3976 | sk->sk_state == BT_CONFIG)) { |
4343478f | 3977 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
3978 | bh_unlock_sock(sk); |
3979 | continue; | |
3980 | } | |
3981 | ||
b1235d79 MH |
3982 | if (sk->sk_state == BT_CONNECT) { |
3983 | if (!status) { | |
3984 | struct l2cap_conn_req req; | |
fe4128e0 GP |
3985 | req.scid = cpu_to_le16(chan->scid); |
3986 | req.psm = chan->psm; | |
1da177e4 | 3987 | |
fc7f8a7e | 3988 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 3989 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3990 | |
fc7f8a7e | 3991 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
3992 | L2CAP_CONN_REQ, sizeof(req), &req); |
3993 | } else { | |
3994 | l2cap_sock_clear_timer(sk); | |
3995 | l2cap_sock_set_timer(sk, HZ / 10); | |
3996 | } | |
3997 | } else if (sk->sk_state == BT_CONNECT2) { | |
3998 | struct l2cap_conn_rsp rsp; | |
3999 | __u16 result; | |
1da177e4 | 4000 | |
b1235d79 MH |
4001 | if (!status) { |
4002 | sk->sk_state = BT_CONFIG; | |
4003 | result = L2CAP_CR_SUCCESS; | |
4004 | } else { | |
4005 | sk->sk_state = BT_DISCONN; | |
4006 | l2cap_sock_set_timer(sk, HZ / 10); | |
4007 | result = L2CAP_CR_SEC_BLOCK; | |
4008 | } | |
4009 | ||
fe4128e0 GP |
4010 | rsp.scid = cpu_to_le16(chan->dcid); |
4011 | rsp.dcid = cpu_to_le16(chan->scid); | |
b1235d79 | 4012 | rsp.result = cpu_to_le16(result); |
e7c29cb1 | 4013 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
fc7f8a7e GP |
4014 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4015 | sizeof(rsp), &rsp); | |
b1235d79 | 4016 | } |
1da177e4 LT |
4017 | |
4018 | bh_unlock_sock(sk); | |
4019 | } | |
4020 | ||
baa7e1fa | 4021 | read_unlock(&conn->chan_lock); |
b1235d79 | 4022 | |
1da177e4 LT |
4023 | return 0; |
4024 | } | |
4025 | ||
4026 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4027 | { | |
4028 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4029 | ||
5a08ecce AE |
4030 | if (!conn) |
4031 | conn = l2cap_conn_add(hcon, 0); | |
4032 | ||
4033 | if (!conn) | |
1da177e4 LT |
4034 | goto drop; |
4035 | ||
4036 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4037 | ||
e702112f | 4038 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4039 | struct l2cap_hdr *hdr; |
48454079 | 4040 | struct l2cap_chan *chan; |
89794813 | 4041 | u16 cid; |
1da177e4 LT |
4042 | int len; |
4043 | ||
4044 | if (conn->rx_len) { | |
4045 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4046 | kfree_skb(conn->rx_skb); | |
4047 | conn->rx_skb = NULL; | |
4048 | conn->rx_len = 0; | |
4049 | l2cap_conn_unreliable(conn, ECOMM); | |
4050 | } | |
4051 | ||
aae7fe22 AE |
4052 | /* Start fragment always begin with Basic L2CAP header */ |
4053 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4054 | BT_ERR("Frame is too short (len %d)", skb->len); |
4055 | l2cap_conn_unreliable(conn, ECOMM); | |
4056 | goto drop; | |
4057 | } | |
4058 | ||
4059 | hdr = (struct l2cap_hdr *) skb->data; | |
4060 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4061 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4062 | |
4063 | if (len == skb->len) { | |
4064 | /* Complete frame received */ | |
4065 | l2cap_recv_frame(conn, skb); | |
4066 | return 0; | |
4067 | } | |
4068 | ||
4069 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4070 | ||
4071 | if (skb->len > len) { | |
4072 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4073 | skb->len, len); | |
4074 | l2cap_conn_unreliable(conn, ECOMM); | |
4075 | goto drop; | |
4076 | } | |
4077 | ||
baa7e1fa | 4078 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4079 | |
48454079 GP |
4080 | if (chan && chan->sk) { |
4081 | struct sock *sk = chan->sk; | |
89794813 | 4082 | |
0c1bc5c6 | 4083 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4084 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4085 | "MTU %d)", len, | |
0c1bc5c6 | 4086 | chan->imtu); |
48454079 GP |
4087 | bh_unlock_sock(sk); |
4088 | l2cap_conn_unreliable(conn, ECOMM); | |
4089 | goto drop; | |
4090 | } | |
89794813 | 4091 | bh_unlock_sock(sk); |
48454079 | 4092 | } |
89794813 | 4093 | |
1da177e4 | 4094 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4095 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4096 | if (!conn->rx_skb) | |
1da177e4 LT |
4097 | goto drop; |
4098 | ||
d626f62b | 4099 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4100 | skb->len); |
1da177e4 LT |
4101 | conn->rx_len = len - skb->len; |
4102 | } else { | |
4103 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4104 | ||
4105 | if (!conn->rx_len) { | |
4106 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4107 | l2cap_conn_unreliable(conn, ECOMM); | |
4108 | goto drop; | |
4109 | } | |
4110 | ||
4111 | if (skb->len > conn->rx_len) { | |
4112 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4113 | skb->len, conn->rx_len); | |
4114 | kfree_skb(conn->rx_skb); | |
4115 | conn->rx_skb = NULL; | |
4116 | conn->rx_len = 0; | |
4117 | l2cap_conn_unreliable(conn, ECOMM); | |
4118 | goto drop; | |
4119 | } | |
4120 | ||
d626f62b | 4121 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4122 | skb->len); |
1da177e4 LT |
4123 | conn->rx_len -= skb->len; |
4124 | ||
4125 | if (!conn->rx_len) { | |
4126 | /* Complete frame received */ | |
4127 | l2cap_recv_frame(conn, conn->rx_skb); | |
4128 | conn->rx_skb = NULL; | |
4129 | } | |
4130 | } | |
4131 | ||
4132 | drop: | |
4133 | kfree_skb(skb); | |
4134 | return 0; | |
4135 | } | |
4136 | ||
aef7d97c | 4137 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4138 | { |
23691d75 | 4139 | struct l2cap_chan *c; |
1da177e4 | 4140 | |
23691d75 | 4141 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4142 | |
23691d75 GP |
4143 | list_for_each_entry(c, &chan_list, global_l) { |
4144 | struct sock *sk = c->sk; | |
101545f6 | 4145 | |
903d343e | 4146 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4147 | batostr(&bt_sk(sk)->src), |
4148 | batostr(&bt_sk(sk)->dst), | |
23691d75 GP |
4149 | sk->sk_state, __le16_to_cpu(c->psm), |
4150 | c->scid, c->dcid, c->imtu, c->omtu, | |
4151 | c->sec_level, c->mode); | |
be9d1227 | 4152 | } |
1da177e4 | 4153 | |
23691d75 | 4154 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4155 | |
aef7d97c | 4156 | return 0; |
1da177e4 LT |
4157 | } |
4158 | ||
aef7d97c MH |
4159 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4160 | { | |
4161 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4162 | } | |
4163 | ||
4164 | static const struct file_operations l2cap_debugfs_fops = { | |
4165 | .open = l2cap_debugfs_open, | |
4166 | .read = seq_read, | |
4167 | .llseek = seq_lseek, | |
4168 | .release = single_release, | |
4169 | }; | |
4170 | ||
4171 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4172 | |
1da177e4 LT |
4173 | static struct hci_proto l2cap_hci_proto = { |
4174 | .name = "L2CAP", | |
4175 | .id = HCI_PROTO_L2CAP, | |
4176 | .connect_ind = l2cap_connect_ind, | |
4177 | .connect_cfm = l2cap_connect_cfm, | |
4178 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4179 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4180 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4181 | .recv_acldata = l2cap_recv_acldata |
4182 | }; | |
4183 | ||
64274518 | 4184 | int __init l2cap_init(void) |
1da177e4 LT |
4185 | { |
4186 | int err; | |
be9d1227 | 4187 | |
bb58f747 | 4188 | err = l2cap_init_sockets(); |
1da177e4 LT |
4189 | if (err < 0) |
4190 | return err; | |
4191 | ||
1890d36b | 4192 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4193 | if (!_busy_wq) { |
bb58f747 | 4194 | err = -ENOMEM; |
1da177e4 LT |
4195 | goto error; |
4196 | } | |
4197 | ||
4198 | err = hci_register_proto(&l2cap_hci_proto); | |
4199 | if (err < 0) { | |
4200 | BT_ERR("L2CAP protocol registration failed"); | |
4201 | bt_sock_unregister(BTPROTO_L2CAP); | |
4202 | goto error; | |
4203 | } | |
4204 | ||
aef7d97c MH |
4205 | if (bt_debugfs) { |
4206 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4207 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4208 | if (!l2cap_debugfs) | |
4209 | BT_ERR("Failed to create L2CAP debug file"); | |
4210 | } | |
1da177e4 | 4211 | |
1da177e4 LT |
4212 | return 0; |
4213 | ||
4214 | error: | |
b78d7b4f | 4215 | destroy_workqueue(_busy_wq); |
bb58f747 | 4216 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4217 | return err; |
4218 | } | |
4219 | ||
64274518 | 4220 | void l2cap_exit(void) |
1da177e4 | 4221 | { |
aef7d97c | 4222 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4223 | |
1890d36b GP |
4224 | flush_workqueue(_busy_wq); |
4225 | destroy_workqueue(_busy_wq); | |
4226 | ||
1da177e4 LT |
4227 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4228 | BT_ERR("L2CAP protocol unregistration failed"); | |
4229 | ||
bb58f747 | 4230 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4231 | } |
4232 | ||
d1c4a17d GP |
4233 | module_param(disable_ertm, bool, 0644); |
4234 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |