Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
4 | ||
5 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License version 2 as | |
9 | published by the Free Software Foundation; | |
10 | ||
11 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
12 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
13 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
14 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
15 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
16 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | ||
8e87d142 YH |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ | |
24 | ||
25 | /* Bluetooth L2CAP core and sockets. */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | ||
29 | #include <linux/types.h> | |
4fc268d2 | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/errno.h> |
32 | #include <linux/kernel.h> | |
1da177e4 LT |
33 | #include <linux/sched.h> |
34 | #include <linux/slab.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/skbuff.h> | |
1da177e4 | 41 | #include <linux/list.h> |
be9d1227 | 42 | #include <linux/device.h> |
1da177e4 LT |
43 | #include <net/sock.h> |
44 | ||
45 | #include <asm/system.h> | |
46 | #include <asm/uaccess.h> | |
47 | #include <asm/unaligned.h> | |
48 | ||
49 | #include <net/bluetooth/bluetooth.h> | |
50 | #include <net/bluetooth/hci_core.h> | |
51 | #include <net/bluetooth/l2cap.h> | |
52 | ||
09ab6f4c | 53 | #define VERSION "2.11" |
f0709e03 MH |
54 | |
55 | static u32 l2cap_feat_mask = 0x0000; | |
1da177e4 | 56 | |
90ddc4f0 | 57 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 LT |
58 | |
59 | static struct bt_sock_list l2cap_sk_list = { | |
d5fb2962 | 60 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
61 | }; |
62 | ||
1da177e4 LT |
63 | static void __l2cap_sock_close(struct sock *sk, int reason); |
64 | static void l2cap_sock_close(struct sock *sk); | |
65 | static void l2cap_sock_kill(struct sock *sk); | |
66 | ||
67 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
68 | u8 code, u8 ident, u16 dlen, void *data); | |
69 | ||
70 | /* ---- L2CAP timers ---- */ | |
71 | static void l2cap_sock_timeout(unsigned long arg) | |
72 | { | |
73 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 74 | int reason; |
1da177e4 LT |
75 | |
76 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
77 | ||
78 | bh_lock_sock(sk); | |
b1235d79 MH |
79 | |
80 | if (sk->sk_state == BT_CONNECT && | |
81 | (l2cap_pi(sk)->link_mode & (L2CAP_LM_AUTH | | |
82 | L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE))) | |
83 | reason = ECONNREFUSED; | |
84 | else | |
85 | reason = ETIMEDOUT; | |
86 | ||
87 | __l2cap_sock_close(sk, reason); | |
88 | ||
1da177e4 LT |
89 | bh_unlock_sock(sk); |
90 | ||
91 | l2cap_sock_kill(sk); | |
92 | sock_put(sk); | |
93 | } | |
94 | ||
95 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
96 | { | |
97 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
98 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
99 | } | |
100 | ||
101 | static void l2cap_sock_clear_timer(struct sock *sk) | |
102 | { | |
103 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
104 | sk_stop_timer(sk, &sk->sk_timer); | |
105 | } | |
106 | ||
0139418c MH |
107 | /* ---- L2CAP channels ---- */ |
108 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
109 | { | |
110 | struct sock *s; | |
111 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
112 | if (l2cap_pi(s)->dcid == cid) | |
113 | break; | |
114 | } | |
115 | return s; | |
116 | } | |
117 | ||
118 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
119 | { | |
120 | struct sock *s; | |
121 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
122 | if (l2cap_pi(s)->scid == cid) | |
123 | break; | |
124 | } | |
125 | return s; | |
126 | } | |
127 | ||
128 | /* Find channel with given SCID. | |
129 | * Returns locked socket */ | |
130 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
131 | { | |
132 | struct sock *s; | |
133 | read_lock(&l->lock); | |
134 | s = __l2cap_get_chan_by_scid(l, cid); | |
135 | if (s) bh_lock_sock(s); | |
136 | read_unlock(&l->lock); | |
137 | return s; | |
138 | } | |
139 | ||
140 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
141 | { | |
142 | struct sock *s; | |
143 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
144 | if (l2cap_pi(s)->ident == ident) | |
145 | break; | |
146 | } | |
147 | return s; | |
148 | } | |
149 | ||
150 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
151 | { | |
152 | struct sock *s; | |
153 | read_lock(&l->lock); | |
154 | s = __l2cap_get_chan_by_ident(l, ident); | |
155 | if (s) bh_lock_sock(s); | |
156 | read_unlock(&l->lock); | |
157 | return s; | |
158 | } | |
159 | ||
160 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
161 | { | |
162 | u16 cid = 0x0040; | |
163 | ||
164 | for (; cid < 0xffff; cid++) { | |
165 | if(!__l2cap_get_chan_by_scid(l, cid)) | |
166 | return cid; | |
167 | } | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
173 | { | |
174 | sock_hold(sk); | |
175 | ||
176 | if (l->head) | |
177 | l2cap_pi(l->head)->prev_c = sk; | |
178 | ||
179 | l2cap_pi(sk)->next_c = l->head; | |
180 | l2cap_pi(sk)->prev_c = NULL; | |
181 | l->head = sk; | |
182 | } | |
183 | ||
184 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
185 | { | |
186 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
187 | ||
fd1278d7 | 188 | write_lock_bh(&l->lock); |
0139418c MH |
189 | if (sk == l->head) |
190 | l->head = next; | |
191 | ||
192 | if (next) | |
193 | l2cap_pi(next)->prev_c = prev; | |
194 | if (prev) | |
195 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 196 | write_unlock_bh(&l->lock); |
0139418c MH |
197 | |
198 | __sock_put(sk); | |
199 | } | |
200 | ||
201 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
202 | { | |
203 | struct l2cap_chan_list *l = &conn->chan_list; | |
204 | ||
205 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
206 | ||
207 | l2cap_pi(sk)->conn = conn; | |
208 | ||
209 | if (sk->sk_type == SOCK_SEQPACKET) { | |
210 | /* Alloc CID for connection-oriented socket */ | |
211 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
212 | } else if (sk->sk_type == SOCK_DGRAM) { | |
213 | /* Connectionless socket */ | |
214 | l2cap_pi(sk)->scid = 0x0002; | |
215 | l2cap_pi(sk)->dcid = 0x0002; | |
216 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
217 | } else { | |
218 | /* Raw socket can send/recv signalling messages only */ | |
219 | l2cap_pi(sk)->scid = 0x0001; | |
220 | l2cap_pi(sk)->dcid = 0x0001; | |
221 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
222 | } | |
223 | ||
224 | __l2cap_chan_link(l, sk); | |
225 | ||
226 | if (parent) | |
227 | bt_accept_enqueue(parent, sk); | |
228 | } | |
229 | ||
8e87d142 | 230 | /* Delete channel. |
0139418c MH |
231 | * Must be called on the locked socket. */ |
232 | static void l2cap_chan_del(struct sock *sk, int err) | |
233 | { | |
234 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
235 | struct sock *parent = bt_sk(sk)->parent; | |
236 | ||
237 | l2cap_sock_clear_timer(sk); | |
238 | ||
239 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
240 | ||
8e87d142 | 241 | if (conn) { |
0139418c MH |
242 | /* Unlink from channel list */ |
243 | l2cap_chan_unlink(&conn->chan_list, sk); | |
244 | l2cap_pi(sk)->conn = NULL; | |
245 | hci_conn_put(conn->hcon); | |
246 | } | |
247 | ||
b1235d79 | 248 | sk->sk_state = BT_CLOSED; |
0139418c MH |
249 | sock_set_flag(sk, SOCK_ZAPPED); |
250 | ||
251 | if (err) | |
252 | sk->sk_err = err; | |
253 | ||
254 | if (parent) { | |
255 | bt_accept_unlink(sk); | |
256 | parent->sk_data_ready(parent, 0); | |
257 | } else | |
258 | sk->sk_state_change(sk); | |
259 | } | |
260 | ||
79d554a6 MH |
261 | /* Service level security */ |
262 | static inline int l2cap_check_link_mode(struct sock *sk) | |
263 | { | |
264 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
265 | ||
266 | if ((l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) || | |
267 | (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) | |
268 | return hci_conn_encrypt(conn->hcon); | |
269 | ||
270 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) | |
271 | return hci_conn_auth(conn->hcon); | |
272 | ||
273 | return 1; | |
274 | } | |
275 | ||
4e8402a3 MH |
276 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
277 | { | |
278 | u8 id; | |
279 | ||
280 | /* Get next available identificator. | |
281 | * 1 - 128 are used by kernel. | |
282 | * 129 - 199 are reserved. | |
283 | * 200 - 254 are used by utilities like l2ping, etc. | |
284 | */ | |
285 | ||
286 | spin_lock_bh(&conn->lock); | |
287 | ||
288 | if (++conn->tx_ident > 128) | |
289 | conn->tx_ident = 1; | |
290 | ||
291 | id = conn->tx_ident; | |
292 | ||
293 | spin_unlock_bh(&conn->lock); | |
294 | ||
295 | return id; | |
296 | } | |
297 | ||
298 | static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) | |
299 | { | |
300 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
301 | ||
302 | BT_DBG("code 0x%2.2x", code); | |
303 | ||
304 | if (!skb) | |
305 | return -ENOMEM; | |
306 | ||
307 | return hci_send_acl(conn->hcon, skb, 0); | |
308 | } | |
309 | ||
79d554a6 MH |
310 | static void l2cap_do_start(struct sock *sk) |
311 | { | |
312 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
313 | ||
314 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
b1235d79 MH |
315 | if (l2cap_check_link_mode(sk)) { |
316 | struct l2cap_conn_req req; | |
317 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
318 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 319 | |
b1235d79 | 320 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 321 | |
b1235d79 | 322 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 323 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 324 | } |
79d554a6 MH |
325 | } else { |
326 | struct l2cap_info_req req; | |
327 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
328 | ||
329 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
330 | conn->info_ident = l2cap_get_ident(conn); | |
331 | ||
332 | mod_timer(&conn->info_timer, jiffies + | |
333 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
334 | ||
335 | l2cap_send_cmd(conn, conn->info_ident, | |
336 | L2CAP_INFO_REQ, sizeof(req), &req); | |
337 | } | |
338 | } | |
339 | ||
1da177e4 | 340 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
341 | static void l2cap_conn_start(struct l2cap_conn *conn) |
342 | { | |
343 | struct l2cap_chan_list *l = &conn->chan_list; | |
344 | struct sock *sk; | |
345 | ||
346 | BT_DBG("conn %p", conn); | |
347 | ||
348 | read_lock(&l->lock); | |
349 | ||
350 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
351 | bh_lock_sock(sk); | |
352 | ||
353 | if (sk->sk_type != SOCK_SEQPACKET) { | |
79d554a6 MH |
354 | bh_unlock_sock(sk); |
355 | continue; | |
356 | } | |
357 | ||
358 | if (sk->sk_state == BT_CONNECT) { | |
b1235d79 MH |
359 | if (l2cap_check_link_mode(sk)) { |
360 | struct l2cap_conn_req req; | |
361 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
362 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 363 | |
b1235d79 | 364 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 365 | |
b1235d79 | 366 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 367 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 368 | } |
79d554a6 MH |
369 | } else if (sk->sk_state == BT_CONNECT2) { |
370 | struct l2cap_conn_rsp rsp; | |
371 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
372 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
373 | ||
374 | if (l2cap_check_link_mode(sk)) { | |
375 | sk->sk_state = BT_CONFIG; | |
376 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
377 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
378 | } else { | |
379 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
380 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
381 | } | |
382 | ||
383 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
384 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
385 | } |
386 | ||
387 | bh_unlock_sock(sk); | |
388 | } | |
389 | ||
390 | read_unlock(&l->lock); | |
391 | } | |
392 | ||
393 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
394 | { | |
79d554a6 MH |
395 | struct l2cap_chan_list *l = &conn->chan_list; |
396 | struct sock *sk; | |
4e8402a3 | 397 | |
79d554a6 | 398 | BT_DBG("conn %p", conn); |
4e8402a3 | 399 | |
79d554a6 | 400 | read_lock(&l->lock); |
4e8402a3 | 401 | |
79d554a6 MH |
402 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
403 | bh_lock_sock(sk); | |
4e8402a3 | 404 | |
79d554a6 MH |
405 | if (sk->sk_type != SOCK_SEQPACKET) { |
406 | l2cap_sock_clear_timer(sk); | |
407 | sk->sk_state = BT_CONNECTED; | |
408 | sk->sk_state_change(sk); | |
409 | } else if (sk->sk_state == BT_CONNECT) | |
410 | l2cap_do_start(sk); | |
4e8402a3 | 411 | |
79d554a6 | 412 | bh_unlock_sock(sk); |
4e8402a3 | 413 | } |
79d554a6 MH |
414 | |
415 | read_unlock(&l->lock); | |
4e8402a3 MH |
416 | } |
417 | ||
418 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
419 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
420 | { | |
421 | struct l2cap_chan_list *l = &conn->chan_list; | |
422 | struct sock *sk; | |
423 | ||
424 | BT_DBG("conn %p", conn); | |
425 | ||
426 | read_lock(&l->lock); | |
427 | ||
428 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
429 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_RELIABLE) | |
430 | sk->sk_err = err; | |
431 | } | |
432 | ||
433 | read_unlock(&l->lock); | |
434 | } | |
435 | ||
436 | static void l2cap_info_timeout(unsigned long arg) | |
437 | { | |
438 | struct l2cap_conn *conn = (void *) arg; | |
439 | ||
440 | conn->info_ident = 0; | |
441 | ||
442 | l2cap_conn_start(conn); | |
443 | } | |
444 | ||
1da177e4 LT |
445 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
446 | { | |
0139418c | 447 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 448 | |
0139418c | 449 | if (conn || status) |
1da177e4 LT |
450 | return conn; |
451 | ||
0139418c MH |
452 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
453 | if (!conn) | |
1da177e4 | 454 | return NULL; |
1da177e4 LT |
455 | |
456 | hcon->l2cap_data = conn; | |
457 | conn->hcon = hcon; | |
458 | ||
0139418c MH |
459 | BT_DBG("hcon %p conn %p", hcon, conn); |
460 | ||
1da177e4 LT |
461 | conn->mtu = hcon->hdev->acl_mtu; |
462 | conn->src = &hcon->hdev->bdaddr; | |
463 | conn->dst = &hcon->dst; | |
464 | ||
4e8402a3 MH |
465 | conn->feat_mask = 0; |
466 | ||
b1235d79 MH |
467 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
468 | (unsigned long) conn); | |
4e8402a3 | 469 | |
1da177e4 LT |
470 | spin_lock_init(&conn->lock); |
471 | rwlock_init(&conn->chan_list.lock); | |
472 | ||
1da177e4 LT |
473 | return conn; |
474 | } | |
475 | ||
0139418c | 476 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 477 | { |
0139418c | 478 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
479 | struct sock *sk; |
480 | ||
0139418c MH |
481 | if (!conn) |
482 | return; | |
1da177e4 LT |
483 | |
484 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
485 | ||
486 | if (conn->rx_skb) | |
487 | kfree_skb(conn->rx_skb); | |
488 | ||
489 | /* Kill channels */ | |
490 | while ((sk = conn->chan_list.head)) { | |
491 | bh_lock_sock(sk); | |
492 | l2cap_chan_del(sk, err); | |
493 | bh_unlock_sock(sk); | |
494 | l2cap_sock_kill(sk); | |
495 | } | |
496 | ||
8e8440f5 DY |
497 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
498 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 499 | |
1da177e4 LT |
500 | hcon->l2cap_data = NULL; |
501 | kfree(conn); | |
1da177e4 LT |
502 | } |
503 | ||
504 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
505 | { | |
506 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 507 | write_lock_bh(&l->lock); |
1da177e4 | 508 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 509 | write_unlock_bh(&l->lock); |
1da177e4 LT |
510 | } |
511 | ||
1da177e4 | 512 | /* ---- Socket interface ---- */ |
8e036fc3 | 513 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
514 | { |
515 | struct sock *sk; | |
516 | struct hlist_node *node; | |
517 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
518 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
519 | goto found; | |
520 | sk = NULL; | |
521 | found: | |
522 | return sk; | |
523 | } | |
524 | ||
525 | /* Find socket with psm and source bdaddr. | |
526 | * Returns closest match. | |
527 | */ | |
8e036fc3 | 528 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
529 | { |
530 | struct sock *sk = NULL, *sk1 = NULL; | |
531 | struct hlist_node *node; | |
532 | ||
533 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
534 | if (state && sk->sk_state != state) | |
535 | continue; | |
536 | ||
537 | if (l2cap_pi(sk)->psm == psm) { | |
538 | /* Exact match. */ | |
539 | if (!bacmp(&bt_sk(sk)->src, src)) | |
540 | break; | |
541 | ||
542 | /* Closest match */ | |
543 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
544 | sk1 = sk; | |
545 | } | |
546 | } | |
547 | return node ? sk : sk1; | |
548 | } | |
549 | ||
550 | /* Find socket with given address (psm, src). | |
551 | * Returns locked socket */ | |
8e036fc3 | 552 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
553 | { |
554 | struct sock *s; | |
555 | read_lock(&l2cap_sk_list.lock); | |
556 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
557 | if (s) bh_lock_sock(s); | |
558 | read_unlock(&l2cap_sk_list.lock); | |
559 | return s; | |
560 | } | |
561 | ||
562 | static void l2cap_sock_destruct(struct sock *sk) | |
563 | { | |
564 | BT_DBG("sk %p", sk); | |
565 | ||
566 | skb_queue_purge(&sk->sk_receive_queue); | |
567 | skb_queue_purge(&sk->sk_write_queue); | |
568 | } | |
569 | ||
570 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
571 | { | |
572 | struct sock *sk; | |
573 | ||
574 | BT_DBG("parent %p", parent); | |
575 | ||
576 | /* Close not yet accepted channels */ | |
577 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
578 | l2cap_sock_close(sk); | |
579 | ||
b1235d79 | 580 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
581 | sock_set_flag(parent, SOCK_ZAPPED); |
582 | } | |
583 | ||
584 | /* Kill socket (only if zapped and orphan) | |
585 | * Must be called on unlocked socket. | |
586 | */ | |
587 | static void l2cap_sock_kill(struct sock *sk) | |
588 | { | |
589 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
590 | return; | |
591 | ||
592 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
593 | ||
594 | /* Kill poor orphan */ | |
595 | bt_sock_unlink(&l2cap_sk_list, sk); | |
596 | sock_set_flag(sk, SOCK_DEAD); | |
597 | sock_put(sk); | |
598 | } | |
599 | ||
600 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
601 | { | |
602 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
603 | ||
604 | switch (sk->sk_state) { | |
605 | case BT_LISTEN: | |
606 | l2cap_sock_cleanup_listen(sk); | |
607 | break; | |
608 | ||
609 | case BT_CONNECTED: | |
610 | case BT_CONFIG: | |
611 | case BT_CONNECT2: | |
612 | if (sk->sk_type == SOCK_SEQPACKET) { | |
613 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
614 | struct l2cap_disconn_req req; | |
615 | ||
616 | sk->sk_state = BT_DISCONN; | |
617 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
618 | ||
aca3192c YH |
619 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
620 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
621 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
622 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
b1235d79 | 623 | } else |
1da177e4 | 624 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
625 | break; |
626 | ||
627 | case BT_CONNECT: | |
628 | case BT_DISCONN: | |
629 | l2cap_chan_del(sk, reason); | |
630 | break; | |
631 | ||
632 | default: | |
633 | sock_set_flag(sk, SOCK_ZAPPED); | |
634 | break; | |
635 | } | |
636 | } | |
637 | ||
638 | /* Must be called on unlocked socket. */ | |
639 | static void l2cap_sock_close(struct sock *sk) | |
640 | { | |
641 | l2cap_sock_clear_timer(sk); | |
642 | lock_sock(sk); | |
643 | __l2cap_sock_close(sk, ECONNRESET); | |
644 | release_sock(sk); | |
645 | l2cap_sock_kill(sk); | |
646 | } | |
647 | ||
648 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
649 | { | |
650 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
651 | ||
652 | BT_DBG("sk %p", sk); | |
653 | ||
654 | if (parent) { | |
655 | sk->sk_type = parent->sk_type; | |
656 | pi->imtu = l2cap_pi(parent)->imtu; | |
657 | pi->omtu = l2cap_pi(parent)->omtu; | |
658 | pi->link_mode = l2cap_pi(parent)->link_mode; | |
659 | } else { | |
660 | pi->imtu = L2CAP_DEFAULT_MTU; | |
661 | pi->omtu = 0; | |
662 | pi->link_mode = 0; | |
663 | } | |
664 | ||
665 | /* Default config options */ | |
5dee9e7c | 666 | pi->conf_len = 0; |
1da177e4 LT |
667 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
668 | } | |
669 | ||
670 | static struct proto l2cap_proto = { | |
671 | .name = "L2CAP", | |
672 | .owner = THIS_MODULE, | |
673 | .obj_size = sizeof(struct l2cap_pinfo) | |
674 | }; | |
675 | ||
1b8d7ae4 | 676 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
677 | { |
678 | struct sock *sk; | |
679 | ||
6257ff21 | 680 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
681 | if (!sk) |
682 | return NULL; | |
683 | ||
684 | sock_init_data(sock, sk); | |
685 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
686 | ||
687 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 688 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
689 | |
690 | sock_reset_flag(sk, SOCK_ZAPPED); | |
691 | ||
692 | sk->sk_protocol = proto; | |
b1235d79 | 693 | sk->sk_state = BT_OPEN; |
1da177e4 | 694 | |
b1235d79 | 695 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
696 | |
697 | bt_sock_link(&l2cap_sk_list, sk); | |
698 | return sk; | |
699 | } | |
700 | ||
1b8d7ae4 | 701 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
702 | { |
703 | struct sock *sk; | |
704 | ||
705 | BT_DBG("sock %p", sock); | |
706 | ||
707 | sock->state = SS_UNCONNECTED; | |
708 | ||
709 | if (sock->type != SOCK_SEQPACKET && | |
710 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) | |
711 | return -ESOCKTNOSUPPORT; | |
712 | ||
713 | if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW)) | |
714 | return -EPERM; | |
715 | ||
716 | sock->ops = &l2cap_sock_ops; | |
717 | ||
1b8d7ae4 | 718 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
719 | if (!sk) |
720 | return -ENOMEM; | |
721 | ||
722 | l2cap_sock_init(sk, NULL); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
727 | { | |
728 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
729 | struct sock *sk = sock->sk; | |
730 | int err = 0; | |
731 | ||
732 | BT_DBG("sk %p, %s %d", sk, batostr(&la->l2_bdaddr), la->l2_psm); | |
733 | ||
734 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
735 | return -EINVAL; | |
736 | ||
737 | lock_sock(sk); | |
738 | ||
739 | if (sk->sk_state != BT_OPEN) { | |
740 | err = -EBADFD; | |
741 | goto done; | |
742 | } | |
743 | ||
8e036fc3 | 744 | if (la->l2_psm && btohs(la->l2_psm) < 0x1001 && |
847641d7 MH |
745 | !capable(CAP_NET_BIND_SERVICE)) { |
746 | err = -EACCES; | |
747 | goto done; | |
748 | } | |
8e87d142 | 749 | |
1da177e4 LT |
750 | write_lock_bh(&l2cap_sk_list.lock); |
751 | ||
752 | if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) { | |
753 | err = -EADDRINUSE; | |
754 | } else { | |
755 | /* Save source address */ | |
756 | bacpy(&bt_sk(sk)->src, &la->l2_bdaddr); | |
757 | l2cap_pi(sk)->psm = la->l2_psm; | |
758 | l2cap_pi(sk)->sport = la->l2_psm; | |
759 | sk->sk_state = BT_BOUND; | |
760 | } | |
761 | ||
762 | write_unlock_bh(&l2cap_sk_list.lock); | |
763 | ||
764 | done: | |
765 | release_sock(sk); | |
766 | return err; | |
767 | } | |
768 | ||
769 | static int l2cap_do_connect(struct sock *sk) | |
770 | { | |
771 | bdaddr_t *src = &bt_sk(sk)->src; | |
772 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
773 | struct l2cap_conn *conn; | |
774 | struct hci_conn *hcon; | |
775 | struct hci_dev *hdev; | |
09ab6f4c | 776 | __u8 auth_type; |
1da177e4 LT |
777 | int err = 0; |
778 | ||
779 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), l2cap_pi(sk)->psm); | |
780 | ||
781 | if (!(hdev = hci_get_route(dst, src))) | |
782 | return -EHOSTUNREACH; | |
783 | ||
784 | hci_dev_lock_bh(hdev); | |
785 | ||
786 | err = -ENOMEM; | |
787 | ||
09ab6f4c MH |
788 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH || |
789 | l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT || | |
790 | l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE) { | |
791 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) | |
792 | auth_type = HCI_AT_NO_BONDING_MITM; | |
793 | else | |
794 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
795 | } else { | |
796 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) | |
797 | auth_type = HCI_AT_NO_BONDING; | |
798 | else | |
799 | auth_type = HCI_AT_GENERAL_BONDING; | |
800 | } | |
801 | ||
802 | hcon = hci_connect(hdev, ACL_LINK, dst, auth_type); | |
1da177e4 LT |
803 | if (!hcon) |
804 | goto done; | |
805 | ||
806 | conn = l2cap_conn_add(hcon, 0); | |
807 | if (!conn) { | |
808 | hci_conn_put(hcon); | |
809 | goto done; | |
810 | } | |
811 | ||
812 | err = 0; | |
813 | ||
814 | /* Update source addr of the socket */ | |
815 | bacpy(src, conn->src); | |
816 | ||
817 | l2cap_chan_add(conn, sk, NULL); | |
818 | ||
819 | sk->sk_state = BT_CONNECT; | |
820 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
821 | ||
822 | if (hcon->state == BT_CONNECTED) { | |
79d554a6 | 823 | if (sk->sk_type != SOCK_SEQPACKET) { |
1da177e4 LT |
824 | l2cap_sock_clear_timer(sk); |
825 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
826 | } else |
827 | l2cap_do_start(sk); | |
1da177e4 LT |
828 | } |
829 | ||
830 | done: | |
831 | hci_dev_unlock_bh(hdev); | |
832 | hci_dev_put(hdev); | |
833 | return err; | |
834 | } | |
835 | ||
836 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
837 | { | |
838 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
839 | struct sock *sk = sock->sk; | |
840 | int err = 0; | |
841 | ||
842 | lock_sock(sk); | |
843 | ||
844 | BT_DBG("sk %p", sk); | |
845 | ||
846 | if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_l2)) { | |
847 | err = -EINVAL; | |
848 | goto done; | |
849 | } | |
850 | ||
851 | if (sk->sk_type == SOCK_SEQPACKET && !la->l2_psm) { | |
852 | err = -EINVAL; | |
853 | goto done; | |
854 | } | |
855 | ||
856 | switch(sk->sk_state) { | |
857 | case BT_CONNECT: | |
858 | case BT_CONNECT2: | |
859 | case BT_CONFIG: | |
860 | /* Already connecting */ | |
861 | goto wait; | |
862 | ||
863 | case BT_CONNECTED: | |
864 | /* Already connected */ | |
865 | goto done; | |
866 | ||
867 | case BT_OPEN: | |
868 | case BT_BOUND: | |
869 | /* Can connect */ | |
870 | break; | |
871 | ||
872 | default: | |
873 | err = -EBADFD; | |
874 | goto done; | |
875 | } | |
876 | ||
877 | /* Set destination address and psm */ | |
878 | bacpy(&bt_sk(sk)->dst, &la->l2_bdaddr); | |
879 | l2cap_pi(sk)->psm = la->l2_psm; | |
880 | ||
881 | if ((err = l2cap_do_connect(sk))) | |
882 | goto done; | |
883 | ||
884 | wait: | |
885 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
886 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
887 | done: | |
888 | release_sock(sk); | |
889 | return err; | |
890 | } | |
891 | ||
892 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
893 | { | |
894 | struct sock *sk = sock->sk; | |
895 | int err = 0; | |
896 | ||
897 | BT_DBG("sk %p backlog %d", sk, backlog); | |
898 | ||
899 | lock_sock(sk); | |
900 | ||
901 | if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) { | |
902 | err = -EBADFD; | |
903 | goto done; | |
904 | } | |
905 | ||
906 | if (!l2cap_pi(sk)->psm) { | |
907 | bdaddr_t *src = &bt_sk(sk)->src; | |
908 | u16 psm; | |
909 | ||
910 | err = -EINVAL; | |
911 | ||
912 | write_lock_bh(&l2cap_sk_list.lock); | |
913 | ||
914 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
6dc0c208 | 915 | if (!__l2cap_get_sock_by_addr(htobs(psm), src)) { |
1da177e4 LT |
916 | l2cap_pi(sk)->psm = htobs(psm); |
917 | l2cap_pi(sk)->sport = htobs(psm); | |
918 | err = 0; | |
919 | break; | |
920 | } | |
921 | ||
922 | write_unlock_bh(&l2cap_sk_list.lock); | |
923 | ||
924 | if (err < 0) | |
925 | goto done; | |
926 | } | |
927 | ||
928 | sk->sk_max_ack_backlog = backlog; | |
929 | sk->sk_ack_backlog = 0; | |
930 | sk->sk_state = BT_LISTEN; | |
931 | ||
932 | done: | |
933 | release_sock(sk); | |
934 | return err; | |
935 | } | |
936 | ||
937 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
938 | { | |
939 | DECLARE_WAITQUEUE(wait, current); | |
940 | struct sock *sk = sock->sk, *nsk; | |
941 | long timeo; | |
942 | int err = 0; | |
943 | ||
fcc70d5f | 944 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
945 | |
946 | if (sk->sk_state != BT_LISTEN) { | |
947 | err = -EBADFD; | |
948 | goto done; | |
949 | } | |
950 | ||
951 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
952 | ||
953 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
954 | ||
955 | /* Wait for an incoming connection. (wake-one). */ | |
956 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
957 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
958 | set_current_state(TASK_INTERRUPTIBLE); | |
959 | if (!timeo) { | |
960 | err = -EAGAIN; | |
961 | break; | |
962 | } | |
963 | ||
964 | release_sock(sk); | |
965 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 966 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
967 | |
968 | if (sk->sk_state != BT_LISTEN) { | |
969 | err = -EBADFD; | |
970 | break; | |
971 | } | |
972 | ||
973 | if (signal_pending(current)) { | |
974 | err = sock_intr_errno(timeo); | |
975 | break; | |
976 | } | |
977 | } | |
978 | set_current_state(TASK_RUNNING); | |
979 | remove_wait_queue(sk->sk_sleep, &wait); | |
980 | ||
981 | if (err) | |
982 | goto done; | |
983 | ||
984 | newsock->state = SS_CONNECTED; | |
985 | ||
986 | BT_DBG("new socket %p", nsk); | |
987 | ||
988 | done: | |
989 | release_sock(sk); | |
990 | return err; | |
991 | } | |
992 | ||
993 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
994 | { | |
995 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
996 | struct sock *sk = sock->sk; | |
997 | ||
998 | BT_DBG("sock %p, sk %p", sock, sk); | |
999 | ||
1000 | addr->sa_family = AF_BLUETOOTH; | |
1001 | *len = sizeof(struct sockaddr_l2); | |
1002 | ||
1003 | if (peer) | |
1004 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); | |
1005 | else | |
1006 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); | |
1007 | ||
1008 | la->l2_psm = l2cap_pi(sk)->psm; | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static inline int l2cap_do_send(struct sock *sk, struct msghdr *msg, int len) | |
1013 | { | |
1014 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1015 | struct sk_buff *skb, **frag; | |
1016 | int err, hlen, count, sent=0; | |
1017 | struct l2cap_hdr *lh; | |
1018 | ||
1019 | BT_DBG("sk %p len %d", sk, len); | |
1020 | ||
1021 | /* First fragment (with L2CAP header) */ | |
1022 | if (sk->sk_type == SOCK_DGRAM) | |
1023 | hlen = L2CAP_HDR_SIZE + 2; | |
1024 | else | |
1025 | hlen = L2CAP_HDR_SIZE; | |
1026 | ||
1027 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1028 | ||
1029 | skb = bt_skb_send_alloc(sk, hlen + count, | |
1030 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1031 | if (!skb) | |
1032 | return err; | |
1033 | ||
1034 | /* Create L2CAP header */ | |
1035 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c YH |
1036 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1037 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1da177e4 LT |
1038 | |
1039 | if (sk->sk_type == SOCK_DGRAM) | |
8e036fc3 | 1040 | put_unaligned(l2cap_pi(sk)->psm, (__le16 *) skb_put(skb, 2)); |
1da177e4 LT |
1041 | |
1042 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) { | |
1043 | err = -EFAULT; | |
1044 | goto fail; | |
1045 | } | |
1046 | ||
1047 | sent += count; | |
1048 | len -= count; | |
1049 | ||
1050 | /* Continuation fragments (no L2CAP header) */ | |
1051 | frag = &skb_shinfo(skb)->frag_list; | |
1052 | while (len) { | |
1053 | count = min_t(unsigned int, conn->mtu, len); | |
1054 | ||
1055 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1056 | if (!*frag) | |
1057 | goto fail; | |
8e87d142 | 1058 | |
1da177e4 LT |
1059 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) { |
1060 | err = -EFAULT; | |
1061 | goto fail; | |
1062 | } | |
1063 | ||
1064 | sent += count; | |
1065 | len -= count; | |
1066 | ||
1067 | frag = &(*frag)->next; | |
1068 | } | |
1069 | ||
1070 | if ((err = hci_send_acl(conn->hcon, skb, 0)) < 0) | |
1071 | goto fail; | |
1072 | ||
1073 | return sent; | |
1074 | ||
1075 | fail: | |
1076 | kfree_skb(skb); | |
1077 | return err; | |
1078 | } | |
1079 | ||
1080 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) | |
1081 | { | |
1082 | struct sock *sk = sock->sk; | |
1083 | int err = 0; | |
1084 | ||
1085 | BT_DBG("sock %p, sk %p", sock, sk); | |
1086 | ||
c1cbe4b7 BL |
1087 | err = sock_error(sk); |
1088 | if (err) | |
1089 | return err; | |
1da177e4 LT |
1090 | |
1091 | if (msg->msg_flags & MSG_OOB) | |
1092 | return -EOPNOTSUPP; | |
1093 | ||
1094 | /* Check outgoing MTU */ | |
1095 | if (sk->sk_type != SOCK_RAW && len > l2cap_pi(sk)->omtu) | |
1096 | return -EINVAL; | |
1097 | ||
1098 | lock_sock(sk); | |
1099 | ||
1100 | if (sk->sk_state == BT_CONNECTED) | |
1101 | err = l2cap_do_send(sk, msg, len); | |
1102 | else | |
1103 | err = -ENOTCONN; | |
1104 | ||
1105 | release_sock(sk); | |
1106 | return err; | |
1107 | } | |
1108 | ||
d58daf42 | 1109 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, int optlen) |
1da177e4 LT |
1110 | { |
1111 | struct sock *sk = sock->sk; | |
1112 | struct l2cap_options opts; | |
1113 | int err = 0, len; | |
1114 | u32 opt; | |
1115 | ||
1116 | BT_DBG("sk %p", sk); | |
1117 | ||
1118 | lock_sock(sk); | |
1119 | ||
1120 | switch (optname) { | |
1121 | case L2CAP_OPTIONS: | |
0878b666 MH |
1122 | opts.imtu = l2cap_pi(sk)->imtu; |
1123 | opts.omtu = l2cap_pi(sk)->omtu; | |
1124 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
6464f35f | 1125 | opts.mode = L2CAP_MODE_BASIC; |
0878b666 | 1126 | |
1da177e4 LT |
1127 | len = min_t(unsigned int, sizeof(opts), optlen); |
1128 | if (copy_from_user((char *) &opts, optval, len)) { | |
1129 | err = -EFAULT; | |
1130 | break; | |
1131 | } | |
0878b666 | 1132 | |
1da177e4 LT |
1133 | l2cap_pi(sk)->imtu = opts.imtu; |
1134 | l2cap_pi(sk)->omtu = opts.omtu; | |
1135 | break; | |
1136 | ||
1137 | case L2CAP_LM: | |
1138 | if (get_user(opt, (u32 __user *) optval)) { | |
1139 | err = -EFAULT; | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | l2cap_pi(sk)->link_mode = opt; | |
1144 | break; | |
1145 | ||
1146 | default: | |
1147 | err = -ENOPROTOOPT; | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | release_sock(sk); | |
1152 | return err; | |
1153 | } | |
1154 | ||
d58daf42 MH |
1155 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) |
1156 | { | |
1157 | struct sock *sk = sock->sk; | |
1158 | int err = 0; | |
1159 | ||
1160 | BT_DBG("sk %p", sk); | |
1161 | ||
1162 | if (level == SOL_L2CAP) | |
1163 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1164 | ||
1165 | lock_sock(sk); | |
1166 | ||
1167 | switch (optname) { | |
1168 | default: | |
1169 | err = -ENOPROTOOPT; | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | release_sock(sk); | |
1174 | return err; | |
1175 | } | |
1176 | ||
1177 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1178 | { |
1179 | struct sock *sk = sock->sk; | |
1180 | struct l2cap_options opts; | |
1181 | struct l2cap_conninfo cinfo; | |
1182 | int len, err = 0; | |
1183 | ||
1184 | BT_DBG("sk %p", sk); | |
1185 | ||
1186 | if (get_user(len, optlen)) | |
1187 | return -EFAULT; | |
1188 | ||
1189 | lock_sock(sk); | |
1190 | ||
1191 | switch (optname) { | |
1192 | case L2CAP_OPTIONS: | |
1193 | opts.imtu = l2cap_pi(sk)->imtu; | |
1194 | opts.omtu = l2cap_pi(sk)->omtu; | |
1195 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
6464f35f | 1196 | opts.mode = L2CAP_MODE_BASIC; |
1da177e4 LT |
1197 | |
1198 | len = min_t(unsigned int, len, sizeof(opts)); | |
1199 | if (copy_to_user(optval, (char *) &opts, len)) | |
1200 | err = -EFAULT; | |
1201 | ||
1202 | break; | |
1203 | ||
1204 | case L2CAP_LM: | |
1205 | if (put_user(l2cap_pi(sk)->link_mode, (u32 __user *) optval)) | |
1206 | err = -EFAULT; | |
1207 | break; | |
1208 | ||
1209 | case L2CAP_CONNINFO: | |
1210 | if (sk->sk_state != BT_CONNECTED) { | |
1211 | err = -ENOTCONN; | |
1212 | break; | |
1213 | } | |
1214 | ||
1215 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1216 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1217 | ||
1218 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1219 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
1220 | err = -EFAULT; | |
1221 | ||
1222 | break; | |
1223 | ||
1224 | default: | |
1225 | err = -ENOPROTOOPT; | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | release_sock(sk); | |
1230 | return err; | |
1231 | } | |
1232 | ||
d58daf42 MH |
1233 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
1234 | { | |
1235 | struct sock *sk = sock->sk; | |
1236 | int len, err = 0; | |
1237 | ||
1238 | BT_DBG("sk %p", sk); | |
1239 | ||
1240 | if (level == SOL_L2CAP) | |
1241 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
1242 | ||
1243 | if (get_user(len, optlen)) | |
1244 | return -EFAULT; | |
1245 | ||
1246 | lock_sock(sk); | |
1247 | ||
1248 | switch (optname) { | |
1249 | default: | |
1250 | err = -ENOPROTOOPT; | |
1251 | break; | |
1252 | } | |
1253 | ||
1254 | release_sock(sk); | |
1255 | return err; | |
1256 | } | |
1257 | ||
1da177e4 LT |
1258 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
1259 | { | |
1260 | struct sock *sk = sock->sk; | |
1261 | int err = 0; | |
1262 | ||
1263 | BT_DBG("sock %p, sk %p", sock, sk); | |
1264 | ||
1265 | if (!sk) | |
1266 | return 0; | |
1267 | ||
1268 | lock_sock(sk); | |
1269 | if (!sk->sk_shutdown) { | |
1270 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1271 | l2cap_sock_clear_timer(sk); | |
1272 | __l2cap_sock_close(sk, 0); | |
1273 | ||
1274 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
1275 | err = bt_sock_wait_state(sk, BT_CLOSED, |
1276 | sk->sk_lingertime); | |
1da177e4 LT |
1277 | } |
1278 | release_sock(sk); | |
1279 | return err; | |
1280 | } | |
1281 | ||
1282 | static int l2cap_sock_release(struct socket *sock) | |
1283 | { | |
1284 | struct sock *sk = sock->sk; | |
1285 | int err; | |
1286 | ||
1287 | BT_DBG("sock %p, sk %p", sock, sk); | |
1288 | ||
1289 | if (!sk) | |
1290 | return 0; | |
1291 | ||
1292 | err = l2cap_sock_shutdown(sock, 2); | |
1293 | ||
1294 | sock_orphan(sk); | |
1295 | l2cap_sock_kill(sk); | |
1296 | return err; | |
1297 | } | |
1298 | ||
1da177e4 LT |
1299 | static void l2cap_chan_ready(struct sock *sk) |
1300 | { | |
1301 | struct sock *parent = bt_sk(sk)->parent; | |
1302 | ||
1303 | BT_DBG("sk %p, parent %p", sk, parent); | |
1304 | ||
1305 | l2cap_pi(sk)->conf_state = 0; | |
1306 | l2cap_sock_clear_timer(sk); | |
1307 | ||
1308 | if (!parent) { | |
1309 | /* Outgoing channel. | |
1310 | * Wake up socket sleeping on connect. | |
1311 | */ | |
1312 | sk->sk_state = BT_CONNECTED; | |
1313 | sk->sk_state_change(sk); | |
1314 | } else { | |
1315 | /* Incoming channel. | |
1316 | * Wake up socket sleeping on accept. | |
1317 | */ | |
1318 | parent->sk_data_ready(parent, 0); | |
1319 | } | |
b1235d79 MH |
1320 | |
1321 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE) { | |
1322 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1323 | hci_conn_change_link_key(conn->hcon); | |
1324 | } | |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | /* Copy frame to all raw sockets on that connection */ | |
1328 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1329 | { | |
1330 | struct l2cap_chan_list *l = &conn->chan_list; | |
1331 | struct sk_buff *nskb; | |
1332 | struct sock * sk; | |
1333 | ||
1334 | BT_DBG("conn %p", conn); | |
1335 | ||
1336 | read_lock(&l->lock); | |
1337 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1338 | if (sk->sk_type != SOCK_RAW) | |
1339 | continue; | |
1340 | ||
1341 | /* Don't send frame to the socket it came from */ | |
1342 | if (skb->sk == sk) | |
1343 | continue; | |
1344 | ||
1345 | if (!(nskb = skb_clone(skb, GFP_ATOMIC))) | |
1346 | continue; | |
1347 | ||
1348 | if (sock_queue_rcv_skb(sk, nskb)) | |
1349 | kfree_skb(nskb); | |
1350 | } | |
1351 | read_unlock(&l->lock); | |
1352 | } | |
1353 | ||
1354 | /* ---- L2CAP signalling commands ---- */ | |
1355 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1356 | u8 code, u8 ident, u16 dlen, void *data) | |
1357 | { | |
1358 | struct sk_buff *skb, **frag; | |
1359 | struct l2cap_cmd_hdr *cmd; | |
1360 | struct l2cap_hdr *lh; | |
1361 | int len, count; | |
1362 | ||
1363 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", conn, code, ident, dlen); | |
1364 | ||
1365 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1366 | count = min_t(unsigned int, conn->mtu, len); | |
1367 | ||
1368 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1369 | if (!skb) | |
1370 | return NULL; | |
1371 | ||
1372 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c YH |
1373 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
1374 | lh->cid = cpu_to_le16(0x0001); | |
1da177e4 LT |
1375 | |
1376 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1377 | cmd->code = code; | |
1378 | cmd->ident = ident; | |
aca3192c | 1379 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1380 | |
1381 | if (dlen) { | |
1382 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1383 | memcpy(skb_put(skb, count), data, count); | |
1384 | data += count; | |
1385 | } | |
1386 | ||
1387 | len -= skb->len; | |
1388 | ||
1389 | /* Continuation fragments (no L2CAP header) */ | |
1390 | frag = &skb_shinfo(skb)->frag_list; | |
1391 | while (len) { | |
1392 | count = min_t(unsigned int, conn->mtu, len); | |
1393 | ||
1394 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1395 | if (!*frag) | |
1396 | goto fail; | |
1397 | ||
1398 | memcpy(skb_put(*frag, count), data, count); | |
1399 | ||
1400 | len -= count; | |
1401 | data += count; | |
1402 | ||
1403 | frag = &(*frag)->next; | |
1404 | } | |
1405 | ||
1406 | return skb; | |
1407 | ||
1408 | fail: | |
1409 | kfree_skb(skb); | |
1410 | return NULL; | |
1411 | } | |
1412 | ||
1413 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1414 | { | |
1415 | struct l2cap_conf_opt *opt = *ptr; | |
1416 | int len; | |
1417 | ||
1418 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1419 | *ptr += len; | |
1420 | ||
1421 | *type = opt->type; | |
1422 | *olen = opt->len; | |
1423 | ||
1424 | switch (opt->len) { | |
1425 | case 1: | |
1426 | *val = *((u8 *) opt->val); | |
1427 | break; | |
1428 | ||
1429 | case 2: | |
861d6882 | 1430 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
1431 | break; |
1432 | ||
1433 | case 4: | |
861d6882 | 1434 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
1435 | break; |
1436 | ||
1437 | default: | |
1438 | *val = (unsigned long) opt->val; | |
1439 | break; | |
1440 | } | |
1441 | ||
1442 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1443 | return len; | |
1444 | } | |
1445 | ||
1da177e4 LT |
1446 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1447 | { | |
1448 | struct l2cap_conf_opt *opt = *ptr; | |
1449 | ||
1450 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1451 | ||
1452 | opt->type = type; | |
1453 | opt->len = len; | |
1454 | ||
1455 | switch (len) { | |
1456 | case 1: | |
1457 | *((u8 *) opt->val) = val; | |
1458 | break; | |
1459 | ||
1460 | case 2: | |
8e036fc3 | 1461 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
1462 | break; |
1463 | ||
1464 | case 4: | |
8e036fc3 | 1465 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
1466 | break; |
1467 | ||
1468 | default: | |
1469 | memcpy(opt->val, (void *) val, len); | |
1470 | break; | |
1471 | } | |
1472 | ||
1473 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1474 | } | |
1475 | ||
1476 | static int l2cap_build_conf_req(struct sock *sk, void *data) | |
1477 | { | |
1478 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1479 | struct l2cap_conf_req *req = data; | |
1480 | void *ptr = req->data; | |
1481 | ||
1482 | BT_DBG("sk %p", sk); | |
1483 | ||
1484 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
1485 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1486 | ||
1487 | /* FIXME: Need actual value of the flush timeout */ | |
1488 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
1489 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
1490 | ||
aca3192c YH |
1491 | req->dcid = cpu_to_le16(pi->dcid); |
1492 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1493 | |
1494 | return ptr - data; | |
1495 | } | |
1496 | ||
5dee9e7c | 1497 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1498 | { |
1499 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1500 | struct l2cap_conf_rsp *rsp = data; |
1501 | void *ptr = rsp->data; | |
1502 | void *req = pi->conf_req; | |
1503 | int len = pi->conf_len; | |
1504 | int type, hint, olen; | |
1505 | unsigned long val; | |
6464f35f | 1506 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1507 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1508 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1509 | |
5dee9e7c | 1510 | BT_DBG("sk %p", sk); |
820ae1b8 | 1511 | |
5dee9e7c MH |
1512 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1513 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1514 | |
5dee9e7c MH |
1515 | hint = type & 0x80; |
1516 | type &= 0x7f; | |
1517 | ||
1518 | switch (type) { | |
1519 | case L2CAP_CONF_MTU: | |
861d6882 | 1520 | mtu = val; |
5dee9e7c MH |
1521 | break; |
1522 | ||
1523 | case L2CAP_CONF_FLUSH_TO: | |
1524 | pi->flush_to = val; | |
1525 | break; | |
1526 | ||
1527 | case L2CAP_CONF_QOS: | |
1528 | break; | |
1529 | ||
6464f35f MH |
1530 | case L2CAP_CONF_RFC: |
1531 | if (olen == sizeof(rfc)) | |
1532 | memcpy(&rfc, (void *) val, olen); | |
1533 | break; | |
1534 | ||
5dee9e7c MH |
1535 | default: |
1536 | if (hint) | |
1537 | break; | |
1538 | ||
1539 | result = L2CAP_CONF_UNKNOWN; | |
1540 | *((u8 *) ptr++) = type; | |
1541 | break; | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | if (result == L2CAP_CONF_SUCCESS) { | |
1546 | /* Configure output options and let the other side know | |
1547 | * which ones we don't like. */ | |
1548 | ||
6464f35f MH |
1549 | if (rfc.mode == L2CAP_MODE_BASIC) { |
1550 | if (mtu < pi->omtu) | |
1551 | result = L2CAP_CONF_UNACCEPT; | |
1552 | else { | |
1553 | pi->omtu = mtu; | |
1554 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1555 | } | |
1556 | ||
1557 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
1558 | } else { | |
5dee9e7c | 1559 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1560 | |
6464f35f MH |
1561 | memset(&rfc, 0, sizeof(rfc)); |
1562 | rfc.mode = L2CAP_MODE_BASIC; | |
1563 | ||
1564 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1565 | sizeof(rfc), (unsigned long) &rfc); | |
1566 | } | |
5dee9e7c MH |
1567 | } |
1568 | ||
1569 | rsp->scid = cpu_to_le16(pi->dcid); | |
1570 | rsp->result = cpu_to_le16(result); | |
1571 | rsp->flags = cpu_to_le16(0x0000); | |
1572 | ||
1573 | return ptr - data; | |
1da177e4 LT |
1574 | } |
1575 | ||
5dee9e7c | 1576 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1577 | { |
1578 | struct l2cap_conf_rsp *rsp = data; | |
1579 | void *ptr = rsp->data; | |
1da177e4 | 1580 | |
5dee9e7c | 1581 | BT_DBG("sk %p", sk); |
1da177e4 | 1582 | |
aca3192c | 1583 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1584 | rsp->result = cpu_to_le16(result); |
aca3192c | 1585 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1586 | |
1587 | return ptr - data; | |
1588 | } | |
1589 | ||
4e8402a3 MH |
1590 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1591 | { | |
1592 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1593 | ||
1594 | if (rej->reason != 0x0000) | |
1595 | return 0; | |
1596 | ||
1597 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1598 | cmd->ident == conn->info_ident) { | |
1599 | conn->info_ident = 0; | |
1600 | del_timer(&conn->info_timer); | |
1601 | l2cap_conn_start(conn); | |
1602 | } | |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
1da177e4 LT |
1607 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1608 | { | |
1609 | struct l2cap_chan_list *list = &conn->chan_list; | |
1610 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1611 | struct l2cap_conn_rsp rsp; | |
1612 | struct sock *sk, *parent; | |
e7c29cb1 | 1613 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1614 | |
1615 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1616 | __le16 psm = req->psm; |
1da177e4 LT |
1617 | |
1618 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1619 | ||
1620 | /* Check if we have socket listening on psm */ | |
1621 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1622 | if (!parent) { | |
1623 | result = L2CAP_CR_BAD_PSM; | |
1624 | goto sendresp; | |
1625 | } | |
1626 | ||
e7c29cb1 MH |
1627 | /* Check if the ACL is secure enough (if not SDP) */ |
1628 | if (psm != cpu_to_le16(0x0001) && | |
1629 | !hci_conn_check_link_mode(conn->hcon)) { | |
1630 | result = L2CAP_CR_SEC_BLOCK; | |
1631 | goto response; | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | result = L2CAP_CR_NO_MEM; |
1635 | ||
1636 | /* Check for backlog size */ | |
1637 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 1638 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
1639 | goto response; |
1640 | } | |
1641 | ||
3b1e0a65 | 1642 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
1643 | if (!sk) |
1644 | goto response; | |
1645 | ||
fd1278d7 | 1646 | write_lock_bh(&list->lock); |
1da177e4 LT |
1647 | |
1648 | /* Check if we already have channel with that dcid */ | |
1649 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 1650 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1651 | sock_set_flag(sk, SOCK_ZAPPED); |
1652 | l2cap_sock_kill(sk); | |
1653 | goto response; | |
1654 | } | |
1655 | ||
1656 | hci_conn_hold(conn->hcon); | |
1657 | ||
1658 | l2cap_sock_init(sk, parent); | |
1659 | bacpy(&bt_sk(sk)->src, conn->src); | |
1660 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1661 | l2cap_pi(sk)->psm = psm; | |
1662 | l2cap_pi(sk)->dcid = scid; | |
1663 | ||
1664 | __l2cap_chan_add(conn, sk, parent); | |
1665 | dcid = l2cap_pi(sk)->scid; | |
1666 | ||
1667 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1668 | ||
1da177e4 LT |
1669 | l2cap_pi(sk)->ident = cmd->ident; |
1670 | ||
79d554a6 MH |
1671 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
1672 | if (l2cap_check_link_mode(sk)) { | |
1673 | sk->sk_state = BT_CONFIG; | |
1674 | result = L2CAP_CR_SUCCESS; | |
1675 | status = L2CAP_CS_NO_INFO; | |
1676 | } else { | |
1677 | sk->sk_state = BT_CONNECT2; | |
1678 | result = L2CAP_CR_PEND; | |
1679 | status = L2CAP_CS_AUTHEN_PEND; | |
1680 | } | |
1681 | } else { | |
1682 | sk->sk_state = BT_CONNECT2; | |
1683 | result = L2CAP_CR_PEND; | |
1684 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
1685 | } |
1686 | ||
fd1278d7 | 1687 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1688 | |
1689 | response: | |
1690 | bh_unlock_sock(parent); | |
1691 | ||
1692 | sendresp: | |
aca3192c YH |
1693 | rsp.scid = cpu_to_le16(scid); |
1694 | rsp.dcid = cpu_to_le16(dcid); | |
1695 | rsp.result = cpu_to_le16(result); | |
1696 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 1697 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
1698 | |
1699 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
1700 | struct l2cap_info_req info; | |
1701 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1702 | ||
1703 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1704 | conn->info_ident = l2cap_get_ident(conn); | |
1705 | ||
1706 | mod_timer(&conn->info_timer, jiffies + | |
1707 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
1708 | ||
1709 | l2cap_send_cmd(conn, conn->info_ident, | |
1710 | L2CAP_INFO_REQ, sizeof(info), &info); | |
1711 | } | |
1712 | ||
1da177e4 LT |
1713 | return 0; |
1714 | } | |
1715 | ||
1716 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1717 | { | |
1718 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
1719 | u16 scid, dcid, result, status; | |
1720 | struct sock *sk; | |
1721 | u8 req[128]; | |
1722 | ||
1723 | scid = __le16_to_cpu(rsp->scid); | |
1724 | dcid = __le16_to_cpu(rsp->dcid); | |
1725 | result = __le16_to_cpu(rsp->result); | |
1726 | status = __le16_to_cpu(rsp->status); | |
1727 | ||
1728 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
1729 | ||
1730 | if (scid) { | |
1731 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1732 | return 0; | |
1733 | } else { | |
1734 | if (!(sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident))) | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | switch (result) { | |
1739 | case L2CAP_CR_SUCCESS: | |
1740 | sk->sk_state = BT_CONFIG; | |
1741 | l2cap_pi(sk)->ident = 0; | |
1742 | l2cap_pi(sk)->dcid = dcid; | |
1743 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1744 | ||
1745 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1746 | l2cap_build_conf_req(sk, req), req); | |
1747 | break; | |
1748 | ||
1749 | case L2CAP_CR_PEND: | |
1750 | break; | |
1751 | ||
1752 | default: | |
1753 | l2cap_chan_del(sk, ECONNREFUSED); | |
1754 | break; | |
1755 | } | |
1756 | ||
1757 | bh_unlock_sock(sk); | |
1758 | return 0; | |
1759 | } | |
1760 | ||
88219a0f | 1761 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
1762 | { |
1763 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
1764 | u16 dcid, flags; | |
1765 | u8 rsp[64]; | |
1766 | struct sock *sk; | |
5dee9e7c | 1767 | int len; |
1da177e4 LT |
1768 | |
1769 | dcid = __le16_to_cpu(req->dcid); | |
1770 | flags = __le16_to_cpu(req->flags); | |
1771 | ||
1772 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
1773 | ||
1774 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid))) | |
1775 | return -ENOENT; | |
1776 | ||
354f60a9 MH |
1777 | if (sk->sk_state == BT_DISCONN) |
1778 | goto unlock; | |
1779 | ||
5dee9e7c | 1780 | /* Reject if config buffer is too small. */ |
88219a0f | 1781 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
1782 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
1783 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
1784 | l2cap_build_conf_rsp(sk, rsp, | |
1785 | L2CAP_CONF_REJECT, flags), rsp); | |
1786 | goto unlock; | |
1787 | } | |
1788 | ||
1789 | /* Store config. */ | |
1790 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
1791 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
1792 | |
1793 | if (flags & 0x0001) { | |
1794 | /* Incomplete config. Send empty response. */ | |
1795 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
1796 | l2cap_build_conf_rsp(sk, rsp, |
1797 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
1798 | goto unlock; |
1799 | } | |
1800 | ||
1801 | /* Complete config. */ | |
5dee9e7c MH |
1802 | len = l2cap_parse_conf_req(sk, rsp); |
1803 | if (len < 0) | |
1da177e4 LT |
1804 | goto unlock; |
1805 | ||
5dee9e7c MH |
1806 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
1807 | ||
5dee9e7c MH |
1808 | /* Reset config buffer. */ |
1809 | l2cap_pi(sk)->conf_len = 0; | |
1810 | ||
876d9484 MH |
1811 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
1812 | goto unlock; | |
1813 | ||
1da177e4 LT |
1814 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
1815 | sk->sk_state = BT_CONNECTED; | |
1816 | l2cap_chan_ready(sk); | |
876d9484 MH |
1817 | goto unlock; |
1818 | } | |
1819 | ||
1820 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 1821 | u8 buf[64]; |
1da177e4 | 1822 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 1823 | l2cap_build_conf_req(sk, buf), buf); |
1da177e4 LT |
1824 | } |
1825 | ||
1826 | unlock: | |
1827 | bh_unlock_sock(sk); | |
1828 | return 0; | |
1829 | } | |
1830 | ||
1831 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1832 | { | |
1833 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
1834 | u16 scid, flags, result; | |
1835 | struct sock *sk; | |
1836 | ||
1837 | scid = __le16_to_cpu(rsp->scid); | |
1838 | flags = __le16_to_cpu(rsp->flags); | |
1839 | result = __le16_to_cpu(rsp->result); | |
1840 | ||
1841 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result); | |
1842 | ||
1843 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1844 | return 0; | |
1845 | ||
1846 | switch (result) { | |
1847 | case L2CAP_CONF_SUCCESS: | |
1848 | break; | |
1849 | ||
1850 | case L2CAP_CONF_UNACCEPT: | |
1851 | if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) { | |
1852 | char req[128]; | |
1853 | /* It does not make sense to adjust L2CAP parameters | |
1854 | * that are currently defined in the spec. We simply | |
1855 | * resend config request that we sent earlier. It is | |
1856 | * stupid, but it helps qualification testing which | |
1857 | * expects at least some response from us. */ | |
1858 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1859 | l2cap_build_conf_req(sk, req), req); | |
1860 | goto done; | |
1861 | } | |
1862 | ||
8e87d142 | 1863 | default: |
1da177e4 | 1864 | sk->sk_state = BT_DISCONN; |
b1235d79 | 1865 | sk->sk_err = ECONNRESET; |
1da177e4 LT |
1866 | l2cap_sock_set_timer(sk, HZ * 5); |
1867 | { | |
1868 | struct l2cap_disconn_req req; | |
aca3192c YH |
1869 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1870 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
1871 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1872 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
1873 | } | |
1874 | goto done; | |
1875 | } | |
1876 | ||
1877 | if (flags & 0x01) | |
1878 | goto done; | |
1879 | ||
1da177e4 LT |
1880 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
1881 | ||
1882 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
1883 | sk->sk_state = BT_CONNECTED; | |
1884 | l2cap_chan_ready(sk); | |
1885 | } | |
1886 | ||
1887 | done: | |
1888 | bh_unlock_sock(sk); | |
1889 | return 0; | |
1890 | } | |
1891 | ||
1892 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1893 | { | |
1894 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
1895 | struct l2cap_disconn_rsp rsp; | |
1896 | u16 dcid, scid; | |
1897 | struct sock *sk; | |
1898 | ||
1899 | scid = __le16_to_cpu(req->scid); | |
1900 | dcid = __le16_to_cpu(req->dcid); | |
1901 | ||
1902 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
1903 | ||
1904 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid))) | |
1905 | return 0; | |
1906 | ||
aca3192c YH |
1907 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
1908 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
1909 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
1910 | ||
1911 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1912 | ||
1913 | l2cap_chan_del(sk, ECONNRESET); | |
1914 | bh_unlock_sock(sk); | |
1915 | ||
1916 | l2cap_sock_kill(sk); | |
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1921 | { | |
1922 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
1923 | u16 dcid, scid; | |
1924 | struct sock *sk; | |
1925 | ||
1926 | scid = __le16_to_cpu(rsp->scid); | |
1927 | dcid = __le16_to_cpu(rsp->dcid); | |
1928 | ||
1929 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
1930 | ||
1931 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1932 | return 0; | |
1933 | ||
1934 | l2cap_chan_del(sk, 0); | |
1935 | bh_unlock_sock(sk); | |
1936 | ||
1937 | l2cap_sock_kill(sk); | |
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1942 | { | |
1943 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
1944 | u16 type; |
1945 | ||
1946 | type = __le16_to_cpu(req->type); | |
1947 | ||
1948 | BT_DBG("type 0x%4.4x", type); | |
1949 | ||
f0709e03 MH |
1950 | if (type == L2CAP_IT_FEAT_MASK) { |
1951 | u8 buf[8]; | |
1952 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
1953 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1954 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
1955 | put_unaligned(cpu_to_le32(l2cap_feat_mask), (__le32 *) rsp->data); | |
1956 | l2cap_send_cmd(conn, cmd->ident, | |
1957 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
1958 | } else { | |
1959 | struct l2cap_info_rsp rsp; | |
1960 | rsp.type = cpu_to_le16(type); | |
1961 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
1962 | l2cap_send_cmd(conn, cmd->ident, | |
1963 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
1964 | } | |
1da177e4 LT |
1965 | |
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1970 | { | |
1971 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
1972 | u16 type, result; | |
1973 | ||
1974 | type = __le16_to_cpu(rsp->type); | |
1975 | result = __le16_to_cpu(rsp->result); | |
1976 | ||
1977 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
1978 | ||
4e8402a3 MH |
1979 | conn->info_ident = 0; |
1980 | ||
1981 | del_timer(&conn->info_timer); | |
1982 | ||
1983 | if (type == L2CAP_IT_FEAT_MASK) | |
83985319 | 1984 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 MH |
1985 | |
1986 | l2cap_conn_start(conn); | |
1987 | ||
1da177e4 LT |
1988 | return 0; |
1989 | } | |
1990 | ||
1991 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
1992 | { | |
1993 | u8 *data = skb->data; | |
1994 | int len = skb->len; | |
1995 | struct l2cap_cmd_hdr cmd; | |
1996 | int err = 0; | |
1997 | ||
1998 | l2cap_raw_recv(conn, skb); | |
1999 | ||
2000 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2001 | u16 cmd_len; |
1da177e4 LT |
2002 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2003 | data += L2CAP_CMD_HDR_SIZE; | |
2004 | len -= L2CAP_CMD_HDR_SIZE; | |
2005 | ||
88219a0f | 2006 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2007 | |
88219a0f | 2008 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2009 | |
88219a0f | 2010 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2011 | BT_DBG("corrupted command"); |
2012 | break; | |
2013 | } | |
2014 | ||
2015 | switch (cmd.code) { | |
2016 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 2017 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
2018 | break; |
2019 | ||
2020 | case L2CAP_CONN_REQ: | |
2021 | err = l2cap_connect_req(conn, &cmd, data); | |
2022 | break; | |
2023 | ||
2024 | case L2CAP_CONN_RSP: | |
2025 | err = l2cap_connect_rsp(conn, &cmd, data); | |
2026 | break; | |
2027 | ||
2028 | case L2CAP_CONF_REQ: | |
88219a0f | 2029 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
2030 | break; |
2031 | ||
2032 | case L2CAP_CONF_RSP: | |
2033 | err = l2cap_config_rsp(conn, &cmd, data); | |
2034 | break; | |
2035 | ||
2036 | case L2CAP_DISCONN_REQ: | |
2037 | err = l2cap_disconnect_req(conn, &cmd, data); | |
2038 | break; | |
2039 | ||
2040 | case L2CAP_DISCONN_RSP: | |
2041 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
2042 | break; | |
2043 | ||
2044 | case L2CAP_ECHO_REQ: | |
88219a0f | 2045 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
2046 | break; |
2047 | ||
2048 | case L2CAP_ECHO_RSP: | |
2049 | break; | |
2050 | ||
2051 | case L2CAP_INFO_REQ: | |
2052 | err = l2cap_information_req(conn, &cmd, data); | |
2053 | break; | |
2054 | ||
2055 | case L2CAP_INFO_RSP: | |
2056 | err = l2cap_information_rsp(conn, &cmd, data); | |
2057 | break; | |
2058 | ||
2059 | default: | |
2060 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
2061 | err = -EINVAL; | |
2062 | break; | |
2063 | } | |
2064 | ||
2065 | if (err) { | |
2066 | struct l2cap_cmd_rej rej; | |
2067 | BT_DBG("error %d", err); | |
2068 | ||
2069 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2070 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2071 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2072 | } | |
2073 | ||
88219a0f AV |
2074 | data += cmd_len; |
2075 | len -= cmd_len; | |
1da177e4 LT |
2076 | } |
2077 | ||
2078 | kfree_skb(skb); | |
2079 | } | |
2080 | ||
2081 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) | |
2082 | { | |
2083 | struct sock *sk; | |
2084 | ||
2085 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
2086 | if (!sk) { | |
2087 | BT_DBG("unknown cid 0x%4.4x", cid); | |
2088 | goto drop; | |
2089 | } | |
2090 | ||
2091 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2092 | ||
2093 | if (sk->sk_state != BT_CONNECTED) | |
2094 | goto drop; | |
2095 | ||
2096 | if (l2cap_pi(sk)->imtu < skb->len) | |
2097 | goto drop; | |
2098 | ||
2099 | /* If socket recv buffers overflows we drop data here | |
2100 | * which is *bad* because L2CAP has to be reliable. | |
2101 | * But we don't have any other choice. L2CAP doesn't | |
2102 | * provide flow control mechanism. */ | |
2103 | ||
2104 | if (!sock_queue_rcv_skb(sk, skb)) | |
2105 | goto done; | |
2106 | ||
2107 | drop: | |
2108 | kfree_skb(skb); | |
2109 | ||
2110 | done: | |
0139418c MH |
2111 | if (sk) |
2112 | bh_unlock_sock(sk); | |
2113 | ||
1da177e4 LT |
2114 | return 0; |
2115 | } | |
2116 | ||
8e036fc3 | 2117 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
2118 | { |
2119 | struct sock *sk; | |
2120 | ||
2121 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
2122 | if (!sk) | |
2123 | goto drop; | |
2124 | ||
2125 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2126 | ||
2127 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
2128 | goto drop; | |
2129 | ||
2130 | if (l2cap_pi(sk)->imtu < skb->len) | |
2131 | goto drop; | |
2132 | ||
2133 | if (!sock_queue_rcv_skb(sk, skb)) | |
2134 | goto done; | |
2135 | ||
2136 | drop: | |
2137 | kfree_skb(skb); | |
2138 | ||
2139 | done: | |
2140 | if (sk) bh_unlock_sock(sk); | |
2141 | return 0; | |
2142 | } | |
2143 | ||
2144 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
2145 | { | |
2146 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
2147 | u16 cid, len; |
2148 | __le16 psm; | |
1da177e4 LT |
2149 | |
2150 | skb_pull(skb, L2CAP_HDR_SIZE); | |
2151 | cid = __le16_to_cpu(lh->cid); | |
2152 | len = __le16_to_cpu(lh->len); | |
2153 | ||
2154 | BT_DBG("len %d, cid 0x%4.4x", len, cid); | |
2155 | ||
2156 | switch (cid) { | |
2157 | case 0x0001: | |
2158 | l2cap_sig_channel(conn, skb); | |
2159 | break; | |
2160 | ||
2161 | case 0x0002: | |
8e036fc3 | 2162 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
2163 | skb_pull(skb, 2); |
2164 | l2cap_conless_channel(conn, psm, skb); | |
2165 | break; | |
2166 | ||
2167 | default: | |
2168 | l2cap_data_channel(conn, cid, skb); | |
2169 | break; | |
2170 | } | |
2171 | } | |
2172 | ||
2173 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
2174 | ||
2175 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
2176 | { | |
2177 | int exact = 0, lm1 = 0, lm2 = 0; | |
2178 | register struct sock *sk; | |
2179 | struct hlist_node *node; | |
2180 | ||
2181 | if (type != ACL_LINK) | |
2182 | return 0; | |
2183 | ||
2184 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
2185 | ||
2186 | /* Find listening sockets and check their link_mode */ | |
2187 | read_lock(&l2cap_sk_list.lock); | |
2188 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
2189 | if (sk->sk_state != BT_LISTEN) | |
2190 | continue; | |
2191 | ||
2192 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2193 | lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode); | |
2194 | exact++; | |
2195 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
2196 | lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode); | |
2197 | } | |
2198 | read_unlock(&l2cap_sk_list.lock); | |
2199 | ||
2200 | return exact ? lm1 : lm2; | |
2201 | } | |
2202 | ||
2203 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
2204 | { | |
0139418c MH |
2205 | struct l2cap_conn *conn; |
2206 | ||
1da177e4 LT |
2207 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
2208 | ||
2209 | if (hcon->type != ACL_LINK) | |
2210 | return 0; | |
2211 | ||
2212 | if (!status) { | |
1da177e4 LT |
2213 | conn = l2cap_conn_add(hcon, status); |
2214 | if (conn) | |
2215 | l2cap_conn_ready(conn); | |
0139418c | 2216 | } else |
1da177e4 LT |
2217 | l2cap_conn_del(hcon, bt_err(status)); |
2218 | ||
2219 | return 0; | |
2220 | } | |
2221 | ||
2222 | static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason) | |
2223 | { | |
2224 | BT_DBG("hcon %p reason %d", hcon, reason); | |
2225 | ||
2226 | if (hcon->type != ACL_LINK) | |
2227 | return 0; | |
2228 | ||
2229 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 2230 | |
1da177e4 LT |
2231 | return 0; |
2232 | } | |
2233 | ||
2234 | static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status) | |
2235 | { | |
2236 | struct l2cap_chan_list *l; | |
40be492f | 2237 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 2238 | struct sock *sk; |
1da177e4 | 2239 | |
0139418c | 2240 | if (!conn) |
1da177e4 | 2241 | return 0; |
0139418c | 2242 | |
1da177e4 LT |
2243 | l = &conn->chan_list; |
2244 | ||
2245 | BT_DBG("conn %p", conn); | |
2246 | ||
2247 | read_lock(&l->lock); | |
2248 | ||
2249 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
40be492f MH |
2250 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2251 | ||
1da177e4 LT |
2252 | bh_lock_sock(sk); |
2253 | ||
40be492f | 2254 | if ((pi->link_mode & (L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE)) && |
b1235d79 MH |
2255 | !(hcon->link_mode & HCI_LM_ENCRYPT) && |
2256 | !status) { | |
1da177e4 LT |
2257 | bh_unlock_sock(sk); |
2258 | continue; | |
2259 | } | |
2260 | ||
b1235d79 MH |
2261 | if (sk->sk_state == BT_CONNECT) { |
2262 | if (!status) { | |
2263 | struct l2cap_conn_req req; | |
2264 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2265 | req.psm = l2cap_pi(sk)->psm; | |
2266 | ||
2267 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
2268 | ||
2269 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
2270 | L2CAP_CONN_REQ, sizeof(req), &req); | |
2271 | } else { | |
2272 | l2cap_sock_clear_timer(sk); | |
2273 | l2cap_sock_set_timer(sk, HZ / 10); | |
2274 | } | |
2275 | } else if (sk->sk_state == BT_CONNECT2) { | |
2276 | struct l2cap_conn_rsp rsp; | |
2277 | __u16 result; | |
2278 | ||
2279 | if (!status) { | |
2280 | sk->sk_state = BT_CONFIG; | |
2281 | result = L2CAP_CR_SUCCESS; | |
2282 | } else { | |
2283 | sk->sk_state = BT_DISCONN; | |
2284 | l2cap_sock_set_timer(sk, HZ / 10); | |
2285 | result = L2CAP_CR_SEC_BLOCK; | |
2286 | } | |
1da177e4 | 2287 | |
b1235d79 MH |
2288 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
2289 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2290 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 2291 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
2292 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2293 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2294 | } | |
1da177e4 LT |
2295 | |
2296 | bh_unlock_sock(sk); | |
2297 | } | |
2298 | ||
2299 | read_unlock(&l->lock); | |
b1235d79 | 2300 | |
1da177e4 LT |
2301 | return 0; |
2302 | } | |
2303 | ||
9719f8af | 2304 | static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
2305 | { |
2306 | struct l2cap_chan_list *l; | |
0139418c | 2307 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 2308 | struct sock *sk; |
1da177e4 | 2309 | |
0139418c | 2310 | if (!conn) |
1da177e4 | 2311 | return 0; |
0139418c | 2312 | |
1da177e4 LT |
2313 | l = &conn->chan_list; |
2314 | ||
2315 | BT_DBG("conn %p", conn); | |
2316 | ||
2317 | read_lock(&l->lock); | |
2318 | ||
2319 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
9719f8af MH |
2320 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2321 | ||
1da177e4 LT |
2322 | bh_lock_sock(sk); |
2323 | ||
9719f8af MH |
2324 | if ((pi->link_mode & (L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE)) && |
2325 | (sk->sk_state == BT_CONNECTED || | |
2326 | sk->sk_state == BT_CONFIG) && | |
2327 | !status && encrypt == 0x00) { | |
2328 | __l2cap_sock_close(sk, ECONNREFUSED); | |
2329 | bh_unlock_sock(sk); | |
2330 | continue; | |
2331 | } | |
2332 | ||
b1235d79 MH |
2333 | if (sk->sk_state == BT_CONNECT) { |
2334 | if (!status) { | |
2335 | struct l2cap_conn_req req; | |
2336 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2337 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 2338 | |
b1235d79 | 2339 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 2340 | |
b1235d79 MH |
2341 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2342 | L2CAP_CONN_REQ, sizeof(req), &req); | |
2343 | } else { | |
2344 | l2cap_sock_clear_timer(sk); | |
2345 | l2cap_sock_set_timer(sk, HZ / 10); | |
2346 | } | |
2347 | } else if (sk->sk_state == BT_CONNECT2) { | |
2348 | struct l2cap_conn_rsp rsp; | |
2349 | __u16 result; | |
1da177e4 | 2350 | |
b1235d79 MH |
2351 | if (!status) { |
2352 | sk->sk_state = BT_CONFIG; | |
2353 | result = L2CAP_CR_SUCCESS; | |
2354 | } else { | |
2355 | sk->sk_state = BT_DISCONN; | |
2356 | l2cap_sock_set_timer(sk, HZ / 10); | |
2357 | result = L2CAP_CR_SEC_BLOCK; | |
2358 | } | |
2359 | ||
2360 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
2361 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2362 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 2363 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
2364 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2365 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2366 | } | |
1da177e4 LT |
2367 | |
2368 | bh_unlock_sock(sk); | |
2369 | } | |
2370 | ||
2371 | read_unlock(&l->lock); | |
b1235d79 | 2372 | |
1da177e4 LT |
2373 | return 0; |
2374 | } | |
2375 | ||
2376 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
2377 | { | |
2378 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2379 | ||
2380 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
2381 | goto drop; | |
2382 | ||
2383 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
2384 | ||
2385 | if (flags & ACL_START) { | |
2386 | struct l2cap_hdr *hdr; | |
2387 | int len; | |
2388 | ||
2389 | if (conn->rx_len) { | |
2390 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
2391 | kfree_skb(conn->rx_skb); | |
2392 | conn->rx_skb = NULL; | |
2393 | conn->rx_len = 0; | |
2394 | l2cap_conn_unreliable(conn, ECOMM); | |
2395 | } | |
2396 | ||
2397 | if (skb->len < 2) { | |
2398 | BT_ERR("Frame is too short (len %d)", skb->len); | |
2399 | l2cap_conn_unreliable(conn, ECOMM); | |
2400 | goto drop; | |
2401 | } | |
2402 | ||
2403 | hdr = (struct l2cap_hdr *) skb->data; | |
2404 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
2405 | ||
2406 | if (len == skb->len) { | |
2407 | /* Complete frame received */ | |
2408 | l2cap_recv_frame(conn, skb); | |
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
2413 | ||
2414 | if (skb->len > len) { | |
2415 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2416 | skb->len, len); | |
2417 | l2cap_conn_unreliable(conn, ECOMM); | |
2418 | goto drop; | |
2419 | } | |
2420 | ||
2421 | /* Allocate skb for the complete frame (with header) */ | |
2422 | if (!(conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC))) | |
2423 | goto drop; | |
2424 | ||
d626f62b ACM |
2425 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2426 | skb->len); | |
1da177e4 LT |
2427 | conn->rx_len = len - skb->len; |
2428 | } else { | |
2429 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
2430 | ||
2431 | if (!conn->rx_len) { | |
2432 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
2433 | l2cap_conn_unreliable(conn, ECOMM); | |
2434 | goto drop; | |
2435 | } | |
2436 | ||
2437 | if (skb->len > conn->rx_len) { | |
2438 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2439 | skb->len, conn->rx_len); | |
2440 | kfree_skb(conn->rx_skb); | |
2441 | conn->rx_skb = NULL; | |
2442 | conn->rx_len = 0; | |
2443 | l2cap_conn_unreliable(conn, ECOMM); | |
2444 | goto drop; | |
2445 | } | |
2446 | ||
d626f62b ACM |
2447 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2448 | skb->len); | |
1da177e4 LT |
2449 | conn->rx_len -= skb->len; |
2450 | ||
2451 | if (!conn->rx_len) { | |
2452 | /* Complete frame received */ | |
2453 | l2cap_recv_frame(conn, conn->rx_skb); | |
2454 | conn->rx_skb = NULL; | |
2455 | } | |
2456 | } | |
2457 | ||
2458 | drop: | |
2459 | kfree_skb(skb); | |
2460 | return 0; | |
2461 | } | |
2462 | ||
be9d1227 | 2463 | static ssize_t l2cap_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
2464 | { |
2465 | struct sock *sk; | |
2466 | struct hlist_node *node; | |
be9d1227 | 2467 | char *str = buf; |
1da177e4 LT |
2468 | |
2469 | read_lock_bh(&l2cap_sk_list.lock); | |
2470 | ||
be9d1227 MH |
2471 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
2472 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1da177e4 | 2473 | |
be9d1227 MH |
2474 | str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n", |
2475 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
73863976 MH |
2476 | sk->sk_state, btohs(pi->psm), pi->scid, pi->dcid, |
2477 | pi->imtu, pi->omtu, pi->link_mode); | |
be9d1227 | 2478 | } |
1da177e4 | 2479 | |
1da177e4 | 2480 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 2481 | |
be9d1227 | 2482 | return (str - buf); |
1da177e4 LT |
2483 | } |
2484 | ||
be9d1227 | 2485 | static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL); |
1da177e4 | 2486 | |
90ddc4f0 | 2487 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
2488 | .family = PF_BLUETOOTH, |
2489 | .owner = THIS_MODULE, | |
2490 | .release = l2cap_sock_release, | |
2491 | .bind = l2cap_sock_bind, | |
2492 | .connect = l2cap_sock_connect, | |
2493 | .listen = l2cap_sock_listen, | |
2494 | .accept = l2cap_sock_accept, | |
2495 | .getname = l2cap_sock_getname, | |
2496 | .sendmsg = l2cap_sock_sendmsg, | |
2497 | .recvmsg = bt_sock_recvmsg, | |
2498 | .poll = bt_sock_poll, | |
3241ad82 | 2499 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
2500 | .mmap = sock_no_mmap, |
2501 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
2502 | .shutdown = l2cap_sock_shutdown, |
2503 | .setsockopt = l2cap_sock_setsockopt, | |
2504 | .getsockopt = l2cap_sock_getsockopt | |
2505 | }; | |
2506 | ||
2507 | static struct net_proto_family l2cap_sock_family_ops = { | |
2508 | .family = PF_BLUETOOTH, | |
2509 | .owner = THIS_MODULE, | |
2510 | .create = l2cap_sock_create, | |
2511 | }; | |
2512 | ||
2513 | static struct hci_proto l2cap_hci_proto = { | |
2514 | .name = "L2CAP", | |
2515 | .id = HCI_PROTO_L2CAP, | |
2516 | .connect_ind = l2cap_connect_ind, | |
2517 | .connect_cfm = l2cap_connect_cfm, | |
2518 | .disconn_ind = l2cap_disconn_ind, | |
2519 | .auth_cfm = l2cap_auth_cfm, | |
2520 | .encrypt_cfm = l2cap_encrypt_cfm, | |
2521 | .recv_acldata = l2cap_recv_acldata | |
2522 | }; | |
2523 | ||
2524 | static int __init l2cap_init(void) | |
2525 | { | |
2526 | int err; | |
be9d1227 | 2527 | |
1da177e4 LT |
2528 | err = proto_register(&l2cap_proto, 0); |
2529 | if (err < 0) | |
2530 | return err; | |
2531 | ||
2532 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
2533 | if (err < 0) { | |
2534 | BT_ERR("L2CAP socket registration failed"); | |
2535 | goto error; | |
2536 | } | |
2537 | ||
2538 | err = hci_register_proto(&l2cap_hci_proto); | |
2539 | if (err < 0) { | |
2540 | BT_ERR("L2CAP protocol registration failed"); | |
2541 | bt_sock_unregister(BTPROTO_L2CAP); | |
2542 | goto error; | |
2543 | } | |
2544 | ||
df5c37ea MH |
2545 | if (class_create_file(bt_class, &class_attr_l2cap) < 0) |
2546 | BT_ERR("Failed to create L2CAP info file"); | |
1da177e4 LT |
2547 | |
2548 | BT_INFO("L2CAP ver %s", VERSION); | |
2549 | BT_INFO("L2CAP socket layer initialized"); | |
2550 | ||
2551 | return 0; | |
2552 | ||
2553 | error: | |
2554 | proto_unregister(&l2cap_proto); | |
2555 | return err; | |
2556 | } | |
2557 | ||
2558 | static void __exit l2cap_exit(void) | |
2559 | { | |
a91f2e39 | 2560 | class_remove_file(bt_class, &class_attr_l2cap); |
1da177e4 LT |
2561 | |
2562 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
2563 | BT_ERR("L2CAP socket unregistration failed"); | |
2564 | ||
2565 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
2566 | BT_ERR("L2CAP protocol unregistration failed"); | |
2567 | ||
2568 | proto_unregister(&l2cap_proto); | |
2569 | } | |
2570 | ||
2571 | void l2cap_load(void) | |
2572 | { | |
2573 | /* Dummy function to trigger automatic L2CAP module loading by | |
2574 | * other modules that use L2CAP sockets but don't use any other | |
2575 | * symbols from it. */ | |
2576 | return; | |
2577 | } | |
2578 | EXPORT_SYMBOL(l2cap_load); | |
2579 | ||
2580 | module_init(l2cap_init); | |
2581 | module_exit(l2cap_exit); | |
2582 | ||
63fbd24e | 2583 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
2584 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
2585 | MODULE_VERSION(VERSION); | |
2586 | MODULE_LICENSE("GPL"); | |
2587 | MODULE_ALIAS("bt-proto-0"); |