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 | ||
27 | /* Bluetooth L2CAP core and sockets. */ | |
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 | ||
dd135240 | 58 | #define VERSION "2.15" |
44dd46de | 59 | |
894718a6 | 60 | static int disable_ertm; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 63 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 64 | |
90ddc4f0 | 65 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 | 66 | |
1890d36b GP |
67 | static struct workqueue_struct *_busy_wq; |
68 | ||
1da177e4 | 69 | static struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 70 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
71 | }; |
72 | ||
1890d36b GP |
73 | static void l2cap_busy_work(struct work_struct *work); |
74 | ||
1da177e4 LT |
75 | static void __l2cap_sock_close(struct sock *sk, int reason); |
76 | static void l2cap_sock_close(struct sock *sk); | |
77 | static void l2cap_sock_kill(struct sock *sk); | |
78 | ||
e9aeb2dd | 79 | static int l2cap_build_conf_req(struct sock *sk, void *data); |
1da177e4 LT |
80 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
81 | u8 code, u8 ident, u16 dlen, void *data); | |
82 | ||
218bb9df GP |
83 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
84 | ||
1da177e4 | 85 | /* ---- L2CAP timers ---- */ |
940a9eea AE |
86 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) |
87 | { | |
88 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
89 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
90 | } | |
91 | ||
92 | static void l2cap_sock_clear_timer(struct sock *sk) | |
93 | { | |
94 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
95 | sk_stop_timer(sk, &sk->sk_timer); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | static void l2cap_sock_timeout(unsigned long arg) |
99 | { | |
100 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 101 | int reason; |
1da177e4 LT |
102 | |
103 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
104 | ||
105 | bh_lock_sock(sk); | |
b1235d79 | 106 | |
940a9eea AE |
107 | if (sock_owned_by_user(sk)) { |
108 | /* sk is owned by user. Try again later */ | |
109 | l2cap_sock_set_timer(sk, HZ / 5); | |
110 | bh_unlock_sock(sk); | |
111 | sock_put(sk); | |
112 | return; | |
113 | } | |
114 | ||
f62e4323 MH |
115 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
116 | reason = ECONNREFUSED; | |
117 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 118 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
119 | reason = ECONNREFUSED; |
120 | else | |
121 | reason = ETIMEDOUT; | |
122 | ||
123 | __l2cap_sock_close(sk, reason); | |
124 | ||
1da177e4 LT |
125 | bh_unlock_sock(sk); |
126 | ||
127 | l2cap_sock_kill(sk); | |
128 | sock_put(sk); | |
129 | } | |
130 | ||
0139418c MH |
131 | /* ---- L2CAP channels ---- */ |
132 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
133 | { | |
134 | struct sock *s; | |
135 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
136 | if (l2cap_pi(s)->dcid == cid) | |
137 | break; | |
138 | } | |
139 | return s; | |
140 | } | |
141 | ||
142 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
143 | { | |
144 | struct sock *s; | |
145 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
146 | if (l2cap_pi(s)->scid == cid) | |
147 | break; | |
148 | } | |
149 | return s; | |
150 | } | |
151 | ||
152 | /* Find channel with given SCID. | |
153 | * Returns locked socket */ | |
154 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
155 | { | |
156 | struct sock *s; | |
157 | read_lock(&l->lock); | |
158 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
159 | if (s) |
160 | bh_lock_sock(s); | |
0139418c MH |
161 | read_unlock(&l->lock); |
162 | return s; | |
163 | } | |
164 | ||
165 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
166 | { | |
167 | struct sock *s; | |
168 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
169 | if (l2cap_pi(s)->ident == ident) | |
170 | break; | |
171 | } | |
172 | return s; | |
173 | } | |
174 | ||
175 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
176 | { | |
177 | struct sock *s; | |
178 | read_lock(&l->lock); | |
179 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
180 | if (s) |
181 | bh_lock_sock(s); | |
0139418c MH |
182 | read_unlock(&l->lock); |
183 | return s; | |
184 | } | |
185 | ||
186 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
187 | { | |
8db4dc46 | 188 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 189 | |
8db4dc46 | 190 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 191 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
192 | return cid; |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
199 | { | |
200 | sock_hold(sk); | |
201 | ||
202 | if (l->head) | |
203 | l2cap_pi(l->head)->prev_c = sk; | |
204 | ||
205 | l2cap_pi(sk)->next_c = l->head; | |
206 | l2cap_pi(sk)->prev_c = NULL; | |
207 | l->head = sk; | |
208 | } | |
209 | ||
210 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
211 | { | |
212 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
213 | ||
fd1278d7 | 214 | write_lock_bh(&l->lock); |
0139418c MH |
215 | if (sk == l->head) |
216 | l->head = next; | |
217 | ||
218 | if (next) | |
219 | l2cap_pi(next)->prev_c = prev; | |
220 | if (prev) | |
221 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 222 | write_unlock_bh(&l->lock); |
0139418c MH |
223 | |
224 | __sock_put(sk); | |
225 | } | |
226 | ||
227 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
228 | { | |
229 | struct l2cap_chan_list *l = &conn->chan_list; | |
230 | ||
af05b30b GP |
231 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
232 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 233 | |
2950f21a MH |
234 | conn->disc_reason = 0x13; |
235 | ||
0139418c MH |
236 | l2cap_pi(sk)->conn = conn; |
237 | ||
bd3c9e25 | 238 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
239 | /* Alloc CID for connection-oriented socket */ |
240 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
241 | } else if (sk->sk_type == SOCK_DGRAM) { | |
242 | /* Connectionless socket */ | |
8db4dc46 GP |
243 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
244 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
245 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
246 | } else { | |
247 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
248 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
249 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
250 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
251 | } | |
252 | ||
253 | __l2cap_chan_link(l, sk); | |
254 | ||
255 | if (parent) | |
256 | bt_accept_enqueue(parent, sk); | |
257 | } | |
258 | ||
8e87d142 | 259 | /* Delete channel. |
0139418c MH |
260 | * Must be called on the locked socket. */ |
261 | static void l2cap_chan_del(struct sock *sk, int err) | |
262 | { | |
263 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
264 | struct sock *parent = bt_sk(sk)->parent; | |
265 | ||
266 | l2cap_sock_clear_timer(sk); | |
267 | ||
268 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
269 | ||
8e87d142 | 270 | if (conn) { |
0139418c MH |
271 | /* Unlink from channel list */ |
272 | l2cap_chan_unlink(&conn->chan_list, sk); | |
273 | l2cap_pi(sk)->conn = NULL; | |
274 | hci_conn_put(conn->hcon); | |
275 | } | |
276 | ||
b1235d79 | 277 | sk->sk_state = BT_CLOSED; |
0139418c MH |
278 | sock_set_flag(sk, SOCK_ZAPPED); |
279 | ||
280 | if (err) | |
281 | sk->sk_err = err; | |
282 | ||
283 | if (parent) { | |
284 | bt_accept_unlink(sk); | |
285 | parent->sk_data_ready(parent, 0); | |
286 | } else | |
287 | sk->sk_state_change(sk); | |
c13ffa62 GP |
288 | |
289 | skb_queue_purge(TX_QUEUE(sk)); | |
290 | ||
291 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
292 | struct srej_list *l, *tmp; | |
293 | ||
294 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
295 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
296 | del_timer(&l2cap_pi(sk)->ack_timer); | |
297 | ||
298 | skb_queue_purge(SREJ_QUEUE(sk)); | |
299 | skb_queue_purge(BUSY_QUEUE(sk)); | |
300 | ||
301 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { | |
302 | list_del(&l->list); | |
303 | kfree(l); | |
304 | } | |
305 | } | |
0139418c MH |
306 | } |
307 | ||
8556edd3 | 308 | static inline u8 l2cap_get_auth_type(struct sock *sk) |
79d554a6 | 309 | { |
8556edd3 JH |
310 | if (sk->sk_type == SOCK_RAW) { |
311 | switch (l2cap_pi(sk)->sec_level) { | |
312 | case BT_SECURITY_HIGH: | |
313 | return HCI_AT_DEDICATED_BONDING_MITM; | |
314 | case BT_SECURITY_MEDIUM: | |
315 | return HCI_AT_DEDICATED_BONDING; | |
316 | default: | |
317 | return HCI_AT_NO_BONDING; | |
318 | } | |
319 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
320 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
321 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 322 | |
00ae4af9 | 323 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 324 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 325 | else |
8556edd3 | 326 | return HCI_AT_NO_BONDING; |
00ae4af9 MH |
327 | } else { |
328 | switch (l2cap_pi(sk)->sec_level) { | |
329 | case BT_SECURITY_HIGH: | |
8556edd3 | 330 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 331 | case BT_SECURITY_MEDIUM: |
8556edd3 | 332 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 333 | default: |
8556edd3 | 334 | return HCI_AT_NO_BONDING; |
00ae4af9 | 335 | } |
0684e5f9 | 336 | } |
8556edd3 JH |
337 | } |
338 | ||
339 | /* Service level security */ | |
340 | static inline int l2cap_check_security(struct sock *sk) | |
341 | { | |
342 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
343 | __u8 auth_type; | |
344 | ||
345 | auth_type = l2cap_get_auth_type(sk); | |
79d554a6 | 346 | |
0684e5f9 MH |
347 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
348 | auth_type); | |
79d554a6 MH |
349 | } |
350 | ||
4e8402a3 MH |
351 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
352 | { | |
353 | u8 id; | |
354 | ||
355 | /* Get next available identificator. | |
356 | * 1 - 128 are used by kernel. | |
357 | * 129 - 199 are reserved. | |
358 | * 200 - 254 are used by utilities like l2ping, etc. | |
359 | */ | |
360 | ||
361 | spin_lock_bh(&conn->lock); | |
362 | ||
363 | if (++conn->tx_ident > 128) | |
364 | conn->tx_ident = 1; | |
365 | ||
366 | id = conn->tx_ident; | |
367 | ||
368 | spin_unlock_bh(&conn->lock); | |
369 | ||
370 | return id; | |
371 | } | |
372 | ||
9a9c6a34 | 373 | static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
374 | { |
375 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 376 | u8 flags; |
4e8402a3 MH |
377 | |
378 | BT_DBG("code 0x%2.2x", code); | |
379 | ||
380 | if (!skb) | |
9a9c6a34 | 381 | return; |
4e8402a3 | 382 | |
e702112f AE |
383 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
384 | flags = ACL_START_NO_FLUSH; | |
385 | else | |
386 | flags = ACL_START; | |
387 | ||
388 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
389 | } |
390 | ||
9a9c6a34 | 391 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
392 | { |
393 | struct sk_buff *skb; | |
394 | struct l2cap_hdr *lh; | |
395 | struct l2cap_conn *conn = pi->conn; | |
c13ffa62 | 396 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 397 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 398 | u8 flags; |
fcc203c3 | 399 | |
c13ffa62 GP |
400 | if (sk->sk_state != BT_CONNECTED) |
401 | return; | |
402 | ||
fcc203c3 GP |
403 | if (pi->fcs == L2CAP_FCS_CRC16) |
404 | hlen += 2; | |
1c2acffb GP |
405 | |
406 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
407 | ||
fcc203c3 | 408 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
409 | control |= L2CAP_CTRL_FRAME_TYPE; |
410 | ||
9e917af1 GP |
411 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
412 | control |= L2CAP_CTRL_FINAL; | |
413 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
414 | } | |
415 | ||
f0946ccf GP |
416 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
417 | control |= L2CAP_CTRL_POLL; | |
418 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
419 | } | |
420 | ||
1c2acffb GP |
421 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
422 | if (!skb) | |
9a9c6a34 | 423 | return; |
1c2acffb GP |
424 | |
425 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 426 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
427 | lh->cid = cpu_to_le16(pi->dcid); |
428 | put_unaligned_le16(control, skb_put(skb, 2)); | |
429 | ||
fcc203c3 GP |
430 | if (pi->fcs == L2CAP_FCS_CRC16) { |
431 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
432 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
433 | } | |
434 | ||
e702112f AE |
435 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
436 | flags = ACL_START_NO_FLUSH; | |
437 | else | |
438 | flags = ACL_START; | |
439 | ||
440 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
441 | } |
442 | ||
9a9c6a34 | 443 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 444 | { |
1890d36b | 445 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 446 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
447 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
448 | } else | |
7e743090 GP |
449 | control |= L2CAP_SUPER_RCV_READY; |
450 | ||
2ab25cdd GP |
451 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
452 | ||
9a9c6a34 | 453 | l2cap_send_sframe(pi, control); |
7e743090 GP |
454 | } |
455 | ||
e501d055 AE |
456 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
457 | { | |
458 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
459 | } | |
460 | ||
79d554a6 MH |
461 | static void l2cap_do_start(struct sock *sk) |
462 | { | |
463 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
464 | ||
465 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
466 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
467 | return; | |
468 | ||
e501d055 | 469 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
470 | struct l2cap_conn_req req; |
471 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
472 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 473 | |
b1235d79 | 474 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 475 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 476 | |
b1235d79 | 477 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 478 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 479 | } |
79d554a6 MH |
480 | } else { |
481 | struct l2cap_info_req req; | |
482 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
483 | ||
484 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
485 | conn->info_ident = l2cap_get_ident(conn); | |
486 | ||
487 | mod_timer(&conn->info_timer, jiffies + | |
488 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
489 | ||
490 | l2cap_send_cmd(conn, conn->info_ident, | |
491 | L2CAP_INFO_REQ, sizeof(req), &req); | |
492 | } | |
493 | } | |
494 | ||
cf6c2c0b GP |
495 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
496 | { | |
497 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 498 | if (!disable_ertm) |
cf6c2c0b GP |
499 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
500 | ||
501 | switch (mode) { | |
502 | case L2CAP_MODE_ERTM: | |
503 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
504 | case L2CAP_MODE_STREAMING: | |
505 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
506 | default: | |
507 | return 0x00; | |
508 | } | |
509 | } | |
510 | ||
9b108fc0 | 511 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
512 | { |
513 | struct l2cap_disconn_req req; | |
514 | ||
c13ffa62 GP |
515 | if (!conn) |
516 | return; | |
517 | ||
518 | skb_queue_purge(TX_QUEUE(sk)); | |
519 | ||
520 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
521 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
522 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
523 | del_timer(&l2cap_pi(sk)->ack_timer); | |
524 | } | |
525 | ||
22121fc9 GP |
526 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
527 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
528 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
529 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
530 | |
531 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 532 | sk->sk_err = err; |
22121fc9 GP |
533 | } |
534 | ||
1da177e4 | 535 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
536 | static void l2cap_conn_start(struct l2cap_conn *conn) |
537 | { | |
538 | struct l2cap_chan_list *l = &conn->chan_list; | |
cf6c2c0b | 539 | struct sock_del_list del, *tmp1, *tmp2; |
4e8402a3 MH |
540 | struct sock *sk; |
541 | ||
542 | BT_DBG("conn %p", conn); | |
543 | ||
cf6c2c0b GP |
544 | INIT_LIST_HEAD(&del.list); |
545 | ||
4e8402a3 MH |
546 | read_lock(&l->lock); |
547 | ||
548 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
549 | bh_lock_sock(sk); | |
550 | ||
bd3c9e25 GP |
551 | if (sk->sk_type != SOCK_SEQPACKET && |
552 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
553 | bh_unlock_sock(sk); |
554 | continue; | |
555 | } | |
556 | ||
557 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 558 | struct l2cap_conn_req req; |
79d554a6 | 559 | |
47731de7 GP |
560 | if (!l2cap_check_security(sk) || |
561 | !__l2cap_no_conn_pending(sk)) { | |
562 | bh_unlock_sock(sk); | |
563 | continue; | |
564 | } | |
79d554a6 | 565 | |
47731de7 GP |
566 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
567 | conn->feat_mask) | |
568 | && l2cap_pi(sk)->conf_state & | |
569 | L2CAP_CONF_STATE2_DEVICE) { | |
570 | tmp1 = kzalloc(sizeof(struct sock_del_list), | |
571 | GFP_ATOMIC); | |
572 | tmp1->sk = sk; | |
573 | list_add_tail(&tmp1->list, &del.list); | |
574 | bh_unlock_sock(sk); | |
575 | continue; | |
b1235d79 | 576 | } |
47731de7 GP |
577 | |
578 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
579 | req.psm = l2cap_pi(sk)->psm; | |
580 | ||
581 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
582 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; | |
583 | ||
584 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
585 | L2CAP_CONN_REQ, sizeof(req), &req); | |
586 | ||
79d554a6 MH |
587 | } else if (sk->sk_state == BT_CONNECT2) { |
588 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 589 | char buf[128]; |
79d554a6 MH |
590 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
591 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
592 | ||
2af6b9d5 | 593 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
594 | if (bt_sk(sk)->defer_setup) { |
595 | struct sock *parent = bt_sk(sk)->parent; | |
596 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
597 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
598 | parent->sk_data_ready(parent, 0); | |
599 | ||
600 | } else { | |
601 | sk->sk_state = BT_CONFIG; | |
602 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
603 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
604 | } | |
79d554a6 MH |
605 | } else { |
606 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
607 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
608 | } | |
609 | ||
610 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
611 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
e9aeb2dd GP |
612 | |
613 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
614 | rsp.result != L2CAP_CR_SUCCESS) { | |
615 | bh_unlock_sock(sk); | |
616 | continue; | |
617 | } | |
618 | ||
619 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
620 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
621 | l2cap_build_conf_req(sk, buf), buf); | |
622 | l2cap_pi(sk)->num_conf_req++; | |
4e8402a3 MH |
623 | } |
624 | ||
625 | bh_unlock_sock(sk); | |
626 | } | |
627 | ||
628 | read_unlock(&l->lock); | |
cf6c2c0b GP |
629 | |
630 | list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { | |
631 | bh_lock_sock(tmp1->sk); | |
632 | __l2cap_sock_close(tmp1->sk, ECONNRESET); | |
633 | bh_unlock_sock(tmp1->sk); | |
634 | list_del(&tmp1->list); | |
635 | kfree(tmp1); | |
636 | } | |
4e8402a3 MH |
637 | } |
638 | ||
639 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
640 | { | |
79d554a6 MH |
641 | struct l2cap_chan_list *l = &conn->chan_list; |
642 | struct sock *sk; | |
4e8402a3 | 643 | |
79d554a6 | 644 | BT_DBG("conn %p", conn); |
4e8402a3 | 645 | |
79d554a6 | 646 | read_lock(&l->lock); |
4e8402a3 | 647 | |
79d554a6 MH |
648 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
649 | bh_lock_sock(sk); | |
4e8402a3 | 650 | |
bd3c9e25 GP |
651 | if (sk->sk_type != SOCK_SEQPACKET && |
652 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
653 | l2cap_sock_clear_timer(sk); |
654 | sk->sk_state = BT_CONNECTED; | |
655 | sk->sk_state_change(sk); | |
656 | } else if (sk->sk_state == BT_CONNECT) | |
657 | l2cap_do_start(sk); | |
4e8402a3 | 658 | |
79d554a6 | 659 | bh_unlock_sock(sk); |
4e8402a3 | 660 | } |
79d554a6 MH |
661 | |
662 | read_unlock(&l->lock); | |
4e8402a3 MH |
663 | } |
664 | ||
665 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
666 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
667 | { | |
668 | struct l2cap_chan_list *l = &conn->chan_list; | |
669 | struct sock *sk; | |
670 | ||
671 | BT_DBG("conn %p", conn); | |
672 | ||
673 | read_lock(&l->lock); | |
674 | ||
675 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 676 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
677 | sk->sk_err = err; |
678 | } | |
679 | ||
680 | read_unlock(&l->lock); | |
681 | } | |
682 | ||
683 | static void l2cap_info_timeout(unsigned long arg) | |
684 | { | |
685 | struct l2cap_conn *conn = (void *) arg; | |
686 | ||
984947dc | 687 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 688 | conn->info_ident = 0; |
984947dc | 689 | |
4e8402a3 MH |
690 | l2cap_conn_start(conn); |
691 | } | |
692 | ||
1da177e4 LT |
693 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
694 | { | |
0139418c | 695 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 696 | |
0139418c | 697 | if (conn || status) |
1da177e4 LT |
698 | return conn; |
699 | ||
0139418c MH |
700 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
701 | if (!conn) | |
1da177e4 | 702 | return NULL; |
1da177e4 LT |
703 | |
704 | hcon->l2cap_data = conn; | |
705 | conn->hcon = hcon; | |
706 | ||
0139418c MH |
707 | BT_DBG("hcon %p conn %p", hcon, conn); |
708 | ||
1da177e4 LT |
709 | conn->mtu = hcon->hdev->acl_mtu; |
710 | conn->src = &hcon->hdev->bdaddr; | |
711 | conn->dst = &hcon->dst; | |
712 | ||
4e8402a3 MH |
713 | conn->feat_mask = 0; |
714 | ||
1da177e4 LT |
715 | spin_lock_init(&conn->lock); |
716 | rwlock_init(&conn->chan_list.lock); | |
717 | ||
45054dc1 DY |
718 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
719 | (unsigned long) conn); | |
720 | ||
2950f21a MH |
721 | conn->disc_reason = 0x13; |
722 | ||
1da177e4 LT |
723 | return conn; |
724 | } | |
725 | ||
0139418c | 726 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 727 | { |
0139418c | 728 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
729 | struct sock *sk; |
730 | ||
0139418c MH |
731 | if (!conn) |
732 | return; | |
1da177e4 LT |
733 | |
734 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
735 | ||
7585b97a | 736 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
737 | |
738 | /* Kill channels */ | |
739 | while ((sk = conn->chan_list.head)) { | |
740 | bh_lock_sock(sk); | |
741 | l2cap_chan_del(sk, err); | |
742 | bh_unlock_sock(sk); | |
743 | l2cap_sock_kill(sk); | |
744 | } | |
745 | ||
8e8440f5 DY |
746 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
747 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 748 | |
1da177e4 LT |
749 | hcon->l2cap_data = NULL; |
750 | kfree(conn); | |
1da177e4 LT |
751 | } |
752 | ||
753 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
754 | { | |
755 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 756 | write_lock_bh(&l->lock); |
1da177e4 | 757 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 758 | write_unlock_bh(&l->lock); |
1da177e4 LT |
759 | } |
760 | ||
1da177e4 | 761 | /* ---- Socket interface ---- */ |
8e036fc3 | 762 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
763 | { |
764 | struct sock *sk; | |
765 | struct hlist_node *node; | |
766 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
767 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
768 | goto found; | |
769 | sk = NULL; | |
770 | found: | |
771 | return sk; | |
772 | } | |
773 | ||
774 | /* Find socket with psm and source bdaddr. | |
775 | * Returns closest match. | |
776 | */ | |
e0f0cb56 | 777 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
778 | { |
779 | struct sock *sk = NULL, *sk1 = NULL; | |
780 | struct hlist_node *node; | |
781 | ||
e0f0cb56 GP |
782 | read_lock(&l2cap_sk_list.lock); |
783 | ||
1da177e4 LT |
784 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
785 | if (state && sk->sk_state != state) | |
786 | continue; | |
787 | ||
788 | if (l2cap_pi(sk)->psm == psm) { | |
789 | /* Exact match. */ | |
790 | if (!bacmp(&bt_sk(sk)->src, src)) | |
791 | break; | |
792 | ||
793 | /* Closest match */ | |
794 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
795 | sk1 = sk; | |
796 | } | |
797 | } | |
1da177e4 | 798 | |
1da177e4 | 799 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
800 | |
801 | return node ? sk : sk1; | |
1da177e4 LT |
802 | } |
803 | ||
804 | static void l2cap_sock_destruct(struct sock *sk) | |
805 | { | |
806 | BT_DBG("sk %p", sk); | |
807 | ||
808 | skb_queue_purge(&sk->sk_receive_queue); | |
809 | skb_queue_purge(&sk->sk_write_queue); | |
810 | } | |
811 | ||
812 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
813 | { | |
814 | struct sock *sk; | |
815 | ||
816 | BT_DBG("parent %p", parent); | |
817 | ||
818 | /* Close not yet accepted channels */ | |
819 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
820 | l2cap_sock_close(sk); | |
821 | ||
b1235d79 | 822 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
823 | sock_set_flag(parent, SOCK_ZAPPED); |
824 | } | |
825 | ||
826 | /* Kill socket (only if zapped and orphan) | |
827 | * Must be called on unlocked socket. | |
828 | */ | |
829 | static void l2cap_sock_kill(struct sock *sk) | |
830 | { | |
831 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
832 | return; | |
833 | ||
834 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
835 | ||
836 | /* Kill poor orphan */ | |
837 | bt_sock_unlink(&l2cap_sk_list, sk); | |
838 | sock_set_flag(sk, SOCK_DEAD); | |
839 | sock_put(sk); | |
840 | } | |
841 | ||
842 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
843 | { | |
844 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
845 | ||
846 | switch (sk->sk_state) { | |
847 | case BT_LISTEN: | |
848 | l2cap_sock_cleanup_listen(sk); | |
849 | break; | |
850 | ||
851 | case BT_CONNECTED: | |
852 | case BT_CONFIG: | |
bd3c9e25 GP |
853 | if (sk->sk_type == SOCK_SEQPACKET || |
854 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 855 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 | 856 | |
1da177e4 | 857 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
9b108fc0 | 858 | l2cap_send_disconn_req(conn, sk, reason); |
b1235d79 | 859 | } else |
1da177e4 | 860 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
861 | break; |
862 | ||
f66dc81f | 863 | case BT_CONNECT2: |
bd3c9e25 GP |
864 | if (sk->sk_type == SOCK_SEQPACKET || |
865 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
866 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
867 | struct l2cap_conn_rsp rsp; | |
868 | __u16 result; | |
869 | ||
870 | if (bt_sk(sk)->defer_setup) | |
871 | result = L2CAP_CR_SEC_BLOCK; | |
872 | else | |
873 | result = L2CAP_CR_BAD_PSM; | |
e733fb62 | 874 | sk->sk_state = BT_DISCONN; |
f66dc81f MH |
875 | |
876 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
877 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
878 | rsp.result = cpu_to_le16(result); | |
879 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
880 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
881 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
882 | } else | |
883 | l2cap_chan_del(sk, reason); | |
884 | break; | |
885 | ||
1da177e4 LT |
886 | case BT_CONNECT: |
887 | case BT_DISCONN: | |
888 | l2cap_chan_del(sk, reason); | |
889 | break; | |
890 | ||
891 | default: | |
892 | sock_set_flag(sk, SOCK_ZAPPED); | |
893 | break; | |
894 | } | |
895 | } | |
896 | ||
897 | /* Must be called on unlocked socket. */ | |
898 | static void l2cap_sock_close(struct sock *sk) | |
899 | { | |
900 | l2cap_sock_clear_timer(sk); | |
901 | lock_sock(sk); | |
902 | __l2cap_sock_close(sk, ECONNRESET); | |
903 | release_sock(sk); | |
904 | l2cap_sock_kill(sk); | |
905 | } | |
906 | ||
907 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
908 | { | |
909 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
910 | ||
911 | BT_DBG("sk %p", sk); | |
912 | ||
913 | if (parent) { | |
914 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
915 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
916 | ||
1da177e4 LT |
917 | pi->imtu = l2cap_pi(parent)->imtu; |
918 | pi->omtu = l2cap_pi(parent)->omtu; | |
85eb53c6 | 919 | pi->conf_state = l2cap_pi(parent)->conf_state; |
c6b03cf9 MH |
920 | pi->mode = l2cap_pi(parent)->mode; |
921 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 922 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 923 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
924 | pi->sec_level = l2cap_pi(parent)->sec_level; |
925 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
926 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
e702112f | 927 | pi->flushable = l2cap_pi(parent)->flushable; |
1da177e4 LT |
928 | } else { |
929 | pi->imtu = L2CAP_DEFAULT_MTU; | |
930 | pi->omtu = 0; | |
d1c4a17d | 931 | if (!disable_ertm && sk->sk_type == SOCK_STREAM) { |
bd3c9e25 | 932 | pi->mode = L2CAP_MODE_ERTM; |
85eb53c6 GP |
933 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
934 | } else { | |
bd3c9e25 | 935 | pi->mode = L2CAP_MODE_BASIC; |
85eb53c6 | 936 | } |
fd059b9b | 937 | pi->max_tx = L2CAP_DEFAULT_MAX_TX; |
c6b03cf9 | 938 | pi->fcs = L2CAP_FCS_CRC16; |
fd059b9b | 939 | pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; |
2af6b9d5 MH |
940 | pi->sec_level = BT_SECURITY_LOW; |
941 | pi->role_switch = 0; | |
942 | pi->force_reliable = 0; | |
e702112f | 943 | pi->flushable = BT_FLUSHABLE_OFF; |
1da177e4 LT |
944 | } |
945 | ||
946 | /* Default config options */ | |
5dee9e7c | 947 | pi->conf_len = 0; |
1da177e4 | 948 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
949 | skb_queue_head_init(TX_QUEUE(sk)); |
950 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 951 | skb_queue_head_init(BUSY_QUEUE(sk)); |
45054dc1 | 952 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
1da177e4 LT |
953 | } |
954 | ||
955 | static struct proto l2cap_proto = { | |
956 | .name = "L2CAP", | |
957 | .owner = THIS_MODULE, | |
958 | .obj_size = sizeof(struct l2cap_pinfo) | |
959 | }; | |
960 | ||
1b8d7ae4 | 961 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
962 | { |
963 | struct sock *sk; | |
964 | ||
6257ff21 | 965 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
966 | if (!sk) |
967 | return NULL; | |
968 | ||
969 | sock_init_data(sock, sk); | |
970 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
971 | ||
972 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 973 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
974 | |
975 | sock_reset_flag(sk, SOCK_ZAPPED); | |
976 | ||
977 | sk->sk_protocol = proto; | |
b1235d79 | 978 | sk->sk_state = BT_OPEN; |
1da177e4 | 979 | |
b1235d79 | 980 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
981 | |
982 | bt_sock_link(&l2cap_sk_list, sk); | |
983 | return sk; | |
984 | } | |
985 | ||
3f378b68 EP |
986 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
987 | int kern) | |
1da177e4 LT |
988 | { |
989 | struct sock *sk; | |
990 | ||
991 | BT_DBG("sock %p", sock); | |
992 | ||
993 | sock->state = SS_UNCONNECTED; | |
994 | ||
bd3c9e25 | 995 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
996 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
997 | return -ESOCKTNOSUPPORT; | |
998 | ||
c84b3268 | 999 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
1000 | return -EPERM; |
1001 | ||
1002 | sock->ops = &l2cap_sock_ops; | |
1003 | ||
1b8d7ae4 | 1004 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
1005 | if (!sk) |
1006 | return -ENOMEM; | |
1007 | ||
1008 | l2cap_sock_init(sk, NULL); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
f29972de | 1012 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 1013 | { |
1da177e4 | 1014 | struct sock *sk = sock->sk; |
f29972de MH |
1015 | struct sockaddr_l2 la; |
1016 | int len, err = 0; | |
1da177e4 | 1017 | |
f29972de | 1018 | BT_DBG("sk %p", sk); |
1da177e4 LT |
1019 | |
1020 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
1021 | return -EINVAL; | |
1022 | ||
f29972de MH |
1023 | memset(&la, 0, sizeof(la)); |
1024 | len = min_t(unsigned int, sizeof(la), alen); | |
1025 | memcpy(&la, addr, len); | |
1026 | ||
2a517ca6 MH |
1027 | if (la.l2_cid) |
1028 | return -EINVAL; | |
1029 | ||
1da177e4 LT |
1030 | lock_sock(sk); |
1031 | ||
1032 | if (sk->sk_state != BT_OPEN) { | |
1033 | err = -EBADFD; | |
1034 | goto done; | |
1035 | } | |
1036 | ||
0fba2558 MM |
1037 | if (la.l2_psm) { |
1038 | __u16 psm = __le16_to_cpu(la.l2_psm); | |
1039 | ||
1040 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1041 | if ((psm & 0x0101) != 0x0001) { | |
1042 | err = -EINVAL; | |
1043 | goto done; | |
1044 | } | |
1045 | ||
1046 | /* Restrict usage of well-known PSMs */ | |
1047 | if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) { | |
1048 | err = -EACCES; | |
1049 | goto done; | |
1050 | } | |
847641d7 | 1051 | } |
8e87d142 | 1052 | |
1da177e4 LT |
1053 | write_lock_bh(&l2cap_sk_list.lock); |
1054 | ||
f29972de | 1055 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
1056 | err = -EADDRINUSE; |
1057 | } else { | |
1058 | /* Save source address */ | |
f29972de MH |
1059 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
1060 | l2cap_pi(sk)->psm = la.l2_psm; | |
1061 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 1062 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 1063 | |
b4324b5d MH |
1064 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
1065 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 1066 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | write_unlock_bh(&l2cap_sk_list.lock); | |
1070 | ||
1071 | done: | |
1072 | release_sock(sk); | |
1073 | return err; | |
1074 | } | |
1075 | ||
1076 | static int l2cap_do_connect(struct sock *sk) | |
1077 | { | |
1078 | bdaddr_t *src = &bt_sk(sk)->src; | |
1079 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1080 | struct l2cap_conn *conn; | |
1081 | struct hci_conn *hcon; | |
1082 | struct hci_dev *hdev; | |
09ab6f4c | 1083 | __u8 auth_type; |
44d0e48e | 1084 | int err; |
1da177e4 | 1085 | |
f29972de MH |
1086 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
1087 | l2cap_pi(sk)->psm); | |
1da177e4 | 1088 | |
af05b30b GP |
1089 | hdev = hci_get_route(dst, src); |
1090 | if (!hdev) | |
1da177e4 LT |
1091 | return -EHOSTUNREACH; |
1092 | ||
1093 | hci_dev_lock_bh(hdev); | |
1094 | ||
1095 | err = -ENOMEM; | |
1096 | ||
8556edd3 | 1097 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 1098 | |
2af6b9d5 MH |
1099 | hcon = hci_connect(hdev, ACL_LINK, dst, |
1100 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
1101 | if (!hcon) |
1102 | goto done; | |
1103 | ||
1104 | conn = l2cap_conn_add(hcon, 0); | |
1105 | if (!conn) { | |
1106 | hci_conn_put(hcon); | |
1107 | goto done; | |
1108 | } | |
1109 | ||
1110 | err = 0; | |
1111 | ||
1112 | /* Update source addr of the socket */ | |
1113 | bacpy(src, conn->src); | |
1114 | ||
1115 | l2cap_chan_add(conn, sk, NULL); | |
1116 | ||
1117 | sk->sk_state = BT_CONNECT; | |
1118 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1119 | ||
1120 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1121 | if (sk->sk_type != SOCK_SEQPACKET && |
1122 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 1123 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
1124 | if (l2cap_check_security(sk)) |
1125 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1126 | } else |
1127 | l2cap_do_start(sk); | |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | done: | |
1131 | hci_dev_unlock_bh(hdev); | |
1132 | hci_dev_put(hdev); | |
1133 | return err; | |
1134 | } | |
1135 | ||
1136 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1137 | { | |
1da177e4 | 1138 | struct sock *sk = sock->sk; |
f29972de MH |
1139 | struct sockaddr_l2 la; |
1140 | int len, err = 0; | |
1da177e4 | 1141 | |
1da177e4 LT |
1142 | BT_DBG("sk %p", sk); |
1143 | ||
6503d961 CG |
1144 | if (!addr || alen < sizeof(addr->sa_family) || |
1145 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1146 | return -EINVAL; |
1da177e4 | 1147 | |
f29972de MH |
1148 | memset(&la, 0, sizeof(la)); |
1149 | len = min_t(unsigned int, sizeof(la), alen); | |
1150 | memcpy(&la, addr, len); | |
1151 | ||
2a517ca6 MH |
1152 | if (la.l2_cid) |
1153 | return -EINVAL; | |
1154 | ||
1155 | lock_sock(sk); | |
1156 | ||
bd3c9e25 GP |
1157 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1158 | && !la.l2_psm) { | |
1da177e4 LT |
1159 | err = -EINVAL; |
1160 | goto done; | |
1161 | } | |
1162 | ||
c6b03cf9 MH |
1163 | switch (l2cap_pi(sk)->mode) { |
1164 | case L2CAP_MODE_BASIC: | |
1165 | break; | |
1166 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1167 | case L2CAP_MODE_STREAMING: |
d1c4a17d | 1168 | if (!disable_ertm) |
c6b03cf9 MH |
1169 | break; |
1170 | /* fall through */ | |
1171 | default: | |
1172 | err = -ENOTSUPP; | |
1173 | goto done; | |
1174 | } | |
1175 | ||
af05b30b | 1176 | switch (sk->sk_state) { |
1da177e4 LT |
1177 | case BT_CONNECT: |
1178 | case BT_CONNECT2: | |
1179 | case BT_CONFIG: | |
1180 | /* Already connecting */ | |
1181 | goto wait; | |
1182 | ||
1183 | case BT_CONNECTED: | |
1184 | /* Already connected */ | |
8b0dc6dc | 1185 | err = -EISCONN; |
1da177e4 LT |
1186 | goto done; |
1187 | ||
1188 | case BT_OPEN: | |
1189 | case BT_BOUND: | |
1190 | /* Can connect */ | |
1191 | break; | |
1192 | ||
1193 | default: | |
1194 | err = -EBADFD; | |
1195 | goto done; | |
1196 | } | |
1197 | ||
0fba2558 MM |
1198 | /* PSM must be odd and lsb of upper byte must be 0 */ |
1199 | if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 && | |
1200 | sk->sk_type != SOCK_RAW) { | |
1201 | err = -EINVAL; | |
1202 | goto done; | |
1203 | } | |
1204 | ||
1da177e4 | 1205 | /* Set destination address and psm */ |
f29972de MH |
1206 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1207 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1208 | |
af05b30b GP |
1209 | err = l2cap_do_connect(sk); |
1210 | if (err) | |
1da177e4 LT |
1211 | goto done; |
1212 | ||
1213 | wait: | |
1214 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1215 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1216 | done: | |
1217 | release_sock(sk); | |
1218 | return err; | |
1219 | } | |
1220 | ||
1221 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1222 | { | |
1223 | struct sock *sk = sock->sk; | |
1224 | int err = 0; | |
1225 | ||
1226 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1227 | ||
1228 | lock_sock(sk); | |
1229 | ||
bd3c9e25 GP |
1230 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1231 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1232 | err = -EBADFD; |
1233 | goto done; | |
1234 | } | |
1235 | ||
c6b03cf9 MH |
1236 | switch (l2cap_pi(sk)->mode) { |
1237 | case L2CAP_MODE_BASIC: | |
1238 | break; | |
1239 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1240 | case L2CAP_MODE_STREAMING: |
d1c4a17d | 1241 | if (!disable_ertm) |
c6b03cf9 MH |
1242 | break; |
1243 | /* fall through */ | |
1244 | default: | |
1245 | err = -ENOTSUPP; | |
1246 | goto done; | |
1247 | } | |
1248 | ||
1da177e4 LT |
1249 | if (!l2cap_pi(sk)->psm) { |
1250 | bdaddr_t *src = &bt_sk(sk)->src; | |
1251 | u16 psm; | |
1252 | ||
1253 | err = -EINVAL; | |
1254 | ||
1255 | write_lock_bh(&l2cap_sk_list.lock); | |
1256 | ||
1257 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1258 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1259 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1260 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1261 | err = 0; |
1262 | break; | |
1263 | } | |
1264 | ||
1265 | write_unlock_bh(&l2cap_sk_list.lock); | |
1266 | ||
1267 | if (err < 0) | |
1268 | goto done; | |
1269 | } | |
1270 | ||
1271 | sk->sk_max_ack_backlog = backlog; | |
1272 | sk->sk_ack_backlog = 0; | |
1273 | sk->sk_state = BT_LISTEN; | |
1274 | ||
1275 | done: | |
1276 | release_sock(sk); | |
1277 | return err; | |
1278 | } | |
1279 | ||
1280 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1281 | { | |
1282 | DECLARE_WAITQUEUE(wait, current); | |
1283 | struct sock *sk = sock->sk, *nsk; | |
1284 | long timeo; | |
1285 | int err = 0; | |
1286 | ||
fcc70d5f | 1287 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1288 | |
1289 | if (sk->sk_state != BT_LISTEN) { | |
1290 | err = -EBADFD; | |
1291 | goto done; | |
1292 | } | |
1293 | ||
1294 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1295 | ||
1296 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1297 | ||
1298 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1299 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1300 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1301 | set_current_state(TASK_INTERRUPTIBLE); | |
1302 | if (!timeo) { | |
1303 | err = -EAGAIN; | |
1304 | break; | |
1305 | } | |
1306 | ||
1307 | release_sock(sk); | |
1308 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1309 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1310 | |
1311 | if (sk->sk_state != BT_LISTEN) { | |
1312 | err = -EBADFD; | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | if (signal_pending(current)) { | |
1317 | err = sock_intr_errno(timeo); | |
1318 | break; | |
1319 | } | |
1320 | } | |
1321 | set_current_state(TASK_RUNNING); | |
aa395145 | 1322 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1323 | |
1324 | if (err) | |
1325 | goto done; | |
1326 | ||
1327 | newsock->state = SS_CONNECTED; | |
1328 | ||
1329 | BT_DBG("new socket %p", nsk); | |
1330 | ||
1331 | done: | |
1332 | release_sock(sk); | |
1333 | return err; | |
1334 | } | |
1335 | ||
1336 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1337 | { | |
1338 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1339 | struct sock *sk = sock->sk; | |
1340 | ||
1341 | BT_DBG("sock %p, sk %p", sock, sk); | |
1342 | ||
1343 | addr->sa_family = AF_BLUETOOTH; | |
1344 | *len = sizeof(struct sockaddr_l2); | |
1345 | ||
f29972de MH |
1346 | if (peer) { |
1347 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1348 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1349 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1350 | } else { |
1351 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1352 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1353 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1354 | } |
1da177e4 | 1355 | |
1da177e4 LT |
1356 | return 0; |
1357 | } | |
1358 | ||
6161c038 GP |
1359 | static int __l2cap_wait_ack(struct sock *sk) |
1360 | { | |
1361 | DECLARE_WAITQUEUE(wait, current); | |
1362 | int err = 0; | |
1363 | int timeo = HZ/5; | |
1364 | ||
2b0b05dd | 1365 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1366 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
1367 | set_current_state(TASK_INTERRUPTIBLE); | |
1368 | ||
1369 | if (!timeo) | |
1370 | timeo = HZ/5; | |
1371 | ||
1372 | if (signal_pending(current)) { | |
1373 | err = sock_intr_errno(timeo); | |
1374 | break; | |
1375 | } | |
1376 | ||
1377 | release_sock(sk); | |
1378 | timeo = schedule_timeout(timeo); | |
1379 | lock_sock(sk); | |
1380 | ||
1381 | err = sock_error(sk); | |
1382 | if (err) | |
1383 | break; | |
1384 | } | |
1385 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1386 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1387 | return err; |
1388 | } | |
1389 | ||
e90bac06 GP |
1390 | static void l2cap_monitor_timeout(unsigned long arg) |
1391 | { | |
1392 | struct sock *sk = (void *) arg; | |
e90bac06 | 1393 | |
0e98958d GP |
1394 | BT_DBG("sk %p", sk); |
1395 | ||
e686219a | 1396 | bh_lock_sock(sk); |
e90bac06 | 1397 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 1398 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 1399 | bh_unlock_sock(sk); |
e90bac06 GP |
1400 | return; |
1401 | } | |
1402 | ||
1403 | l2cap_pi(sk)->retry_count++; | |
1404 | __mod_monitor_timer(); | |
1405 | ||
a2e12a2a | 1406 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1407 | bh_unlock_sock(sk); |
e90bac06 GP |
1408 | } |
1409 | ||
1410 | static void l2cap_retrans_timeout(unsigned long arg) | |
1411 | { | |
1412 | struct sock *sk = (void *) arg; | |
e90bac06 | 1413 | |
0e98958d GP |
1414 | BT_DBG("sk %p", sk); |
1415 | ||
e686219a | 1416 | bh_lock_sock(sk); |
e90bac06 GP |
1417 | l2cap_pi(sk)->retry_count = 1; |
1418 | __mod_monitor_timer(); | |
1419 | ||
1420 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1421 | ||
a2e12a2a | 1422 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1423 | bh_unlock_sock(sk); |
e90bac06 GP |
1424 | } |
1425 | ||
1c2acffb | 1426 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1427 | { |
1c2acffb | 1428 | struct sk_buff *skb; |
1da177e4 | 1429 | |
812e737e GP |
1430 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1431 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1432 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1433 | break; | |
1da177e4 | 1434 | |
1c2acffb GP |
1435 | skb = skb_dequeue(TX_QUEUE(sk)); |
1436 | kfree_skb(skb); | |
1da177e4 | 1437 | |
1c2acffb GP |
1438 | l2cap_pi(sk)->unacked_frames--; |
1439 | } | |
1da177e4 | 1440 | |
e90bac06 GP |
1441 | if (!l2cap_pi(sk)->unacked_frames) |
1442 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 1443 | } |
1da177e4 | 1444 | |
9a9c6a34 | 1445 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1446 | { |
1447 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
1448 | struct hci_conn *hcon = pi->conn->hcon; |
1449 | u16 flags; | |
1c2acffb GP |
1450 | |
1451 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1452 | |
e702112f AE |
1453 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
1454 | flags = ACL_START_NO_FLUSH; | |
1455 | else | |
1456 | flags = ACL_START; | |
1457 | ||
1458 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1459 | } |
1460 | ||
305682e8 | 1461 | static void l2cap_streaming_send(struct sock *sk) |
6840ed07 | 1462 | { |
ccbb84af | 1463 | struct sk_buff *skb; |
6840ed07 | 1464 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1465 | u16 control, fcs; |
6840ed07 | 1466 | |
ccbb84af GP |
1467 | while ((skb = skb_dequeue(TX_QUEUE(sk)))) { |
1468 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); | |
6840ed07 | 1469 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1470 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1471 | |
e8235c6b | 1472 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1473 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1474 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1475 | } |
1476 | ||
ccbb84af | 1477 | l2cap_do_send(sk, skb); |
6840ed07 GP |
1478 | |
1479 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
6840ed07 | 1480 | } |
6840ed07 GP |
1481 | } |
1482 | ||
dfc909be | 1483 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1484 | { |
1485 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1486 | struct sk_buff *skb, *tx_skb; | |
1487 | u16 control, fcs; | |
8f17154f GP |
1488 | |
1489 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1490 | if (!skb) |
1491 | return; | |
8f17154f | 1492 | |
f11d676d GP |
1493 | do { |
1494 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1495 | break; |
8f17154f | 1496 | |
f11d676d GP |
1497 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1498 | return; | |
8f17154f | 1499 | |
f11d676d | 1500 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1501 | |
f11d676d GP |
1502 | if (pi->remote_max_tx && |
1503 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1504 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
f11d676d GP |
1505 | return; |
1506 | } | |
1507 | ||
1508 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1509 | bt_cb(skb)->retries++; | |
1510 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1511 | |
1512 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1513 | control |= L2CAP_CTRL_FINAL; | |
1514 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1515 | } | |
95ffa978 | 1516 | |
f11d676d GP |
1517 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1518 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1519 | |
f11d676d GP |
1520 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1521 | ||
1522 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1523 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1524 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1525 | } | |
1526 | ||
1527 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1528 | } |
1529 | ||
1c2acffb GP |
1530 | static int l2cap_ertm_send(struct sock *sk) |
1531 | { | |
1532 | struct sk_buff *skb, *tx_skb; | |
1533 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1534 | u16 control, fcs; |
9a9c6a34 | 1535 | int nsent = 0; |
1c2acffb | 1536 | |
c13ffa62 GP |
1537 | if (sk->sk_state != BT_CONNECTED) |
1538 | return -ENOTCONN; | |
e90bac06 | 1539 | |
6e2b6722 | 1540 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1541 | |
e90bac06 GP |
1542 | if (pi->remote_max_tx && |
1543 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1544 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1545 | break; |
1546 | } | |
1547 | ||
e420aba3 AE |
1548 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1549 | ||
e90bac06 GP |
1550 | bt_cb(skb)->retries++; |
1551 | ||
1c2acffb | 1552 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1553 | control &= L2CAP_CTRL_SAR; |
1554 | ||
d5392c8f GP |
1555 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1556 | control |= L2CAP_CTRL_FINAL; | |
1557 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1558 | } | |
9f121a5a | 1559 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1560 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1561 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1562 | ||
e90bac06 | 1563 | |
e8235c6b | 1564 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1565 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1566 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1567 | } | |
1568 | ||
9a9c6a34 GP |
1569 | l2cap_do_send(sk, tx_skb); |
1570 | ||
e90bac06 | 1571 | __mod_retrans_timer(); |
1c2acffb GP |
1572 | |
1573 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1574 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1575 | ||
1576 | pi->unacked_frames++; | |
d5392c8f | 1577 | pi->frames_sent++; |
1c2acffb GP |
1578 | |
1579 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1580 | sk->sk_send_head = NULL; | |
1581 | else | |
1582 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1583 | |
1584 | nsent++; | |
1c2acffb GP |
1585 | } |
1586 | ||
9e917af1 GP |
1587 | return nsent; |
1588 | } | |
1589 | ||
dfc909be GP |
1590 | static int l2cap_retransmit_frames(struct sock *sk) |
1591 | { | |
1592 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1593 | int ret; | |
1594 | ||
dfc909be GP |
1595 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1596 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1597 | ||
1598 | pi->next_tx_seq = pi->expected_ack_seq; | |
1599 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1600 | return ret; |
1601 | } | |
1602 | ||
9a9c6a34 | 1603 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1604 | { |
1605 | struct sock *sk = (struct sock *)pi; | |
1606 | u16 control = 0; | |
1607 | ||
1608 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1609 | ||
1610 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1611 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1612 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1613 | l2cap_send_sframe(pi, control); |
1614 | return; | |
9e917af1 | 1615 | } |
dfc909be | 1616 | |
e0f66218 | 1617 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1618 | return; |
1619 | ||
1620 | control |= L2CAP_SUPER_RCV_READY; | |
1621 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1622 | } |
1623 | ||
9a9c6a34 | 1624 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1625 | { |
1626 | struct srej_list *tail; | |
1627 | u16 control; | |
1628 | ||
1629 | control = L2CAP_SUPER_SELECT_REJECT; | |
1630 | control |= L2CAP_CTRL_FINAL; | |
1631 | ||
1632 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1633 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1634 | ||
1635 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1636 | } |
1637 | ||
1c2acffb GP |
1638 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1639 | { | |
1640 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1641 | struct sk_buff **frag; | |
1642 | int err, sent = 0; | |
1da177e4 | 1643 | |
59203a21 | 1644 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1645 | return -EFAULT; |
1da177e4 LT |
1646 | |
1647 | sent += count; | |
1648 | len -= count; | |
1649 | ||
1650 | /* Continuation fragments (no L2CAP header) */ | |
1651 | frag = &skb_shinfo(skb)->frag_list; | |
1652 | while (len) { | |
1653 | count = min_t(unsigned int, conn->mtu, len); | |
1654 | ||
1655 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1656 | if (!*frag) | |
0175d629 | 1657 | return err; |
1c2acffb GP |
1658 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1659 | return -EFAULT; | |
1da177e4 LT |
1660 | |
1661 | sent += count; | |
1662 | len -= count; | |
1663 | ||
1664 | frag = &(*frag)->next; | |
1665 | } | |
1da177e4 LT |
1666 | |
1667 | return sent; | |
1c2acffb | 1668 | } |
1da177e4 | 1669 | |
1c2acffb GP |
1670 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1671 | { | |
1672 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1673 | struct sk_buff *skb; | |
1674 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1675 | struct l2cap_hdr *lh; | |
1676 | ||
1677 | BT_DBG("sk %p len %d", sk, (int)len); | |
1678 | ||
1679 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1680 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1681 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1682 | if (!skb) | |
0175d629 | 1683 | return ERR_PTR(err); |
1c2acffb GP |
1684 | |
1685 | /* Create L2CAP header */ | |
1686 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1687 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1688 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1689 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1690 | ||
1691 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1692 | if (unlikely(err < 0)) { | |
1693 | kfree_skb(skb); | |
1694 | return ERR_PTR(err); | |
1695 | } | |
1696 | return skb; | |
1697 | } | |
1698 | ||
1699 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1700 | { | |
1701 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1702 | struct sk_buff *skb; | |
1703 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1704 | struct l2cap_hdr *lh; | |
1705 | ||
1706 | BT_DBG("sk %p len %d", sk, (int)len); | |
1707 | ||
1708 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1709 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1710 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1711 | if (!skb) | |
0175d629 | 1712 | return ERR_PTR(err); |
1c2acffb GP |
1713 | |
1714 | /* Create L2CAP header */ | |
1715 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1716 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1717 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1718 | ||
1719 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1720 | if (unlikely(err < 0)) { | |
1721 | kfree_skb(skb); | |
1722 | return ERR_PTR(err); | |
1723 | } | |
1724 | return skb; | |
1725 | } | |
1726 | ||
6840ed07 | 1727 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1728 | { |
1729 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1730 | struct sk_buff *skb; | |
1731 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1732 | struct l2cap_hdr *lh; | |
1733 | ||
1734 | BT_DBG("sk %p len %d", sk, (int)len); | |
1735 | ||
0ee0d208 GP |
1736 | if (!conn) |
1737 | return ERR_PTR(-ENOTCONN); | |
1738 | ||
c74e560c GP |
1739 | if (sdulen) |
1740 | hlen += 2; | |
1741 | ||
fcc203c3 GP |
1742 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1743 | hlen += 2; | |
1744 | ||
1c2acffb GP |
1745 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1746 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1747 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1748 | if (!skb) | |
0175d629 | 1749 | return ERR_PTR(err); |
1c2acffb GP |
1750 | |
1751 | /* Create L2CAP header */ | |
1752 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1753 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1754 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1755 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1756 | if (sdulen) |
1757 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1758 | |
1759 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1760 | if (unlikely(err < 0)) { | |
1761 | kfree_skb(skb); | |
1762 | return ERR_PTR(err); | |
1763 | } | |
e90bac06 | 1764 | |
fcc203c3 GP |
1765 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1766 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1767 | ||
e90bac06 | 1768 | bt_cb(skb)->retries = 0; |
1c2acffb | 1769 | return skb; |
1da177e4 LT |
1770 | } |
1771 | ||
c74e560c GP |
1772 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1773 | { | |
1774 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1775 | struct sk_buff *skb; | |
1776 | struct sk_buff_head sar_queue; | |
1777 | u16 control; | |
1778 | size_t size = 0; | |
1779 | ||
ff12fd64 | 1780 | skb_queue_head_init(&sar_queue); |
c74e560c | 1781 | control = L2CAP_SDU_START; |
1c762159 | 1782 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1783 | if (IS_ERR(skb)) |
1784 | return PTR_ERR(skb); | |
1785 | ||
1786 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1787 | len -= pi->remote_mps; |
1788 | size += pi->remote_mps; | |
c74e560c GP |
1789 | |
1790 | while (len > 0) { | |
1791 | size_t buflen; | |
1792 | ||
1c762159 | 1793 | if (len > pi->remote_mps) { |
44651b85 | 1794 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1795 | buflen = pi->remote_mps; |
c74e560c | 1796 | } else { |
44651b85 | 1797 | control = L2CAP_SDU_END; |
c74e560c GP |
1798 | buflen = len; |
1799 | } | |
1800 | ||
6840ed07 | 1801 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1802 | if (IS_ERR(skb)) { |
1803 | skb_queue_purge(&sar_queue); | |
1804 | return PTR_ERR(skb); | |
1805 | } | |
1806 | ||
1807 | __skb_queue_tail(&sar_queue, skb); | |
1808 | len -= buflen; | |
1809 | size += buflen; | |
c74e560c GP |
1810 | } |
1811 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1812 | if (sk->sk_send_head == NULL) | |
1813 | sk->sk_send_head = sar_queue.next; | |
1814 | ||
1815 | return size; | |
1816 | } | |
1817 | ||
1da177e4 LT |
1818 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1819 | { | |
1820 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1821 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1822 | struct sk_buff *skb; | |
1823 | u16 control; | |
1824 | int err; | |
1da177e4 LT |
1825 | |
1826 | BT_DBG("sock %p, sk %p", sock, sk); | |
1827 | ||
c1cbe4b7 BL |
1828 | err = sock_error(sk); |
1829 | if (err) | |
1830 | return err; | |
1da177e4 LT |
1831 | |
1832 | if (msg->msg_flags & MSG_OOB) | |
1833 | return -EOPNOTSUPP; | |
1834 | ||
1da177e4 LT |
1835 | lock_sock(sk); |
1836 | ||
1c2acffb | 1837 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1838 | err = -ENOTCONN; |
1c2acffb GP |
1839 | goto done; |
1840 | } | |
1da177e4 | 1841 | |
1c2acffb GP |
1842 | /* Connectionless channel */ |
1843 | if (sk->sk_type == SOCK_DGRAM) { | |
1844 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1845 | if (IS_ERR(skb)) { |
477fffb0 | 1846 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1847 | } else { |
1848 | l2cap_do_send(sk, skb); | |
1849 | err = len; | |
1850 | } | |
1c2acffb GP |
1851 | goto done; |
1852 | } | |
1853 | ||
1854 | switch (pi->mode) { | |
1855 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1856 | /* Check outgoing MTU */ |
1857 | if (len > pi->omtu) { | |
f9dd11b0 | 1858 | err = -EMSGSIZE; |
c69163e9 GP |
1859 | goto done; |
1860 | } | |
1861 | ||
1c2acffb GP |
1862 | /* Create a basic PDU */ |
1863 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1864 | if (IS_ERR(skb)) { | |
1865 | err = PTR_ERR(skb); | |
1866 | goto done; | |
1867 | } | |
1868 | ||
9a9c6a34 GP |
1869 | l2cap_do_send(sk, skb); |
1870 | err = len; | |
1c2acffb GP |
1871 | break; |
1872 | ||
1873 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1874 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1875 | /* Entire SDU fits into one PDU */ |
1c762159 | 1876 | if (len <= pi->remote_mps) { |
1c2acffb | 1877 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1878 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1879 | if (IS_ERR(skb)) { |
1880 | err = PTR_ERR(skb); | |
1881 | goto done; | |
1882 | } | |
c74e560c | 1883 | __skb_queue_tail(TX_QUEUE(sk), skb); |
dfc909be | 1884 | |
c74e560c GP |
1885 | if (sk->sk_send_head == NULL) |
1886 | sk->sk_send_head = skb; | |
dfc909be | 1887 | |
1c2acffb | 1888 | } else { |
c74e560c GP |
1889 | /* Segment SDU into multiples PDUs */ |
1890 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1891 | if (err < 0) | |
1892 | goto done; | |
1c2acffb | 1893 | } |
1c2acffb | 1894 | |
dfc909be | 1895 | if (pi->mode == L2CAP_MODE_STREAMING) { |
305682e8 | 1896 | l2cap_streaming_send(sk); |
dfc909be | 1897 | } else { |
4571928f DS |
1898 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
1899 | (pi->conn_state & L2CAP_CONN_WAIT_F)) { | |
6e2b6722 GP |
1900 | err = len; |
1901 | break; | |
1902 | } | |
6840ed07 | 1903 | err = l2cap_ertm_send(sk); |
dfc909be | 1904 | } |
6840ed07 | 1905 | |
9e917af1 | 1906 | if (err >= 0) |
1c2acffb GP |
1907 | err = len; |
1908 | break; | |
1909 | ||
1910 | default: | |
1911 | BT_DBG("bad state %1.1x", pi->mode); | |
bc766db2 | 1912 | err = -EBADFD; |
1c2acffb GP |
1913 | } |
1914 | ||
1915 | done: | |
1da177e4 LT |
1916 | release_sock(sk); |
1917 | return err; | |
1918 | } | |
1919 | ||
f66dc81f MH |
1920 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1921 | { | |
1922 | struct sock *sk = sock->sk; | |
1923 | ||
1924 | lock_sock(sk); | |
1925 | ||
1926 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1927 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd GP |
1928 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1929 | u8 buf[128]; | |
f66dc81f MH |
1930 | |
1931 | sk->sk_state = BT_CONFIG; | |
1932 | ||
1933 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1934 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1935 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1936 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1937 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1938 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1939 | ||
e9aeb2dd GP |
1940 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { |
1941 | release_sock(sk); | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1946 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1947 | l2cap_build_conf_req(sk, buf), buf); | |
1948 | l2cap_pi(sk)->num_conf_req++; | |
1949 | ||
f66dc81f MH |
1950 | release_sock(sk); |
1951 | return 0; | |
1952 | } | |
1953 | ||
1954 | release_sock(sk); | |
1955 | ||
6fdf482b MM |
1956 | if (sock->type == SOCK_STREAM) |
1957 | return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags); | |
1958 | ||
f66dc81f MH |
1959 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); |
1960 | } | |
1961 | ||
b7058842 | 1962 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1963 | { |
1964 | struct sock *sk = sock->sk; | |
1965 | struct l2cap_options opts; | |
f29972de | 1966 | int len, err = 0; |
1da177e4 LT |
1967 | u32 opt; |
1968 | ||
1969 | BT_DBG("sk %p", sk); | |
1970 | ||
1971 | lock_sock(sk); | |
1972 | ||
1973 | switch (optname) { | |
1974 | case L2CAP_OPTIONS: | |
eaa71b31 GP |
1975 | if (sk->sk_state == BT_CONNECTED) { |
1976 | err = -EINVAL; | |
1977 | break; | |
1978 | } | |
1979 | ||
0878b666 MH |
1980 | opts.imtu = l2cap_pi(sk)->imtu; |
1981 | opts.omtu = l2cap_pi(sk)->omtu; | |
1982 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1983 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1984 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1985 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1986 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1987 | |
1da177e4 LT |
1988 | len = min_t(unsigned int, sizeof(opts), optlen); |
1989 | if (copy_from_user((char *) &opts, optval, len)) { | |
1990 | err = -EFAULT; | |
1991 | break; | |
1992 | } | |
0878b666 | 1993 | |
45d65c46 GP |
1994 | if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { |
1995 | err = -EINVAL; | |
1996 | break; | |
1997 | } | |
1998 | ||
0041ecfa JPRV |
1999 | l2cap_pi(sk)->mode = opts.mode; |
2000 | switch (l2cap_pi(sk)->mode) { | |
2001 | case L2CAP_MODE_BASIC: | |
85eb53c6 | 2002 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; |
0041ecfa JPRV |
2003 | break; |
2004 | case L2CAP_MODE_ERTM: | |
2005 | case L2CAP_MODE_STREAMING: | |
d1c4a17d | 2006 | if (!disable_ertm) |
0041ecfa JPRV |
2007 | break; |
2008 | /* fall through */ | |
2009 | default: | |
2010 | err = -EINVAL; | |
2011 | break; | |
2012 | } | |
2013 | ||
c6b03cf9 MH |
2014 | l2cap_pi(sk)->imtu = opts.imtu; |
2015 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 2016 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 2017 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 2018 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
2019 | break; |
2020 | ||
2021 | case L2CAP_LM: | |
2022 | if (get_user(opt, (u32 __user *) optval)) { | |
2023 | err = -EFAULT; | |
2024 | break; | |
2025 | } | |
2026 | ||
2af6b9d5 MH |
2027 | if (opt & L2CAP_LM_AUTH) |
2028 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
2029 | if (opt & L2CAP_LM_ENCRYPT) | |
2030 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
2031 | if (opt & L2CAP_LM_SECURE) | |
2032 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
2033 | ||
2034 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
2035 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
2036 | break; |
2037 | ||
2038 | default: | |
2039 | err = -ENOPROTOOPT; | |
2040 | break; | |
2041 | } | |
2042 | ||
2043 | release_sock(sk); | |
2044 | return err; | |
2045 | } | |
2046 | ||
b7058842 | 2047 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
2048 | { |
2049 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
2050 | struct bt_security sec; |
2051 | int len, err = 0; | |
f66dc81f | 2052 | u32 opt; |
d58daf42 MH |
2053 | |
2054 | BT_DBG("sk %p", sk); | |
2055 | ||
2056 | if (level == SOL_L2CAP) | |
2057 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
2058 | ||
0588d94f MH |
2059 | if (level != SOL_BLUETOOTH) |
2060 | return -ENOPROTOOPT; | |
2061 | ||
d58daf42 MH |
2062 | lock_sock(sk); |
2063 | ||
2064 | switch (optname) { | |
2af6b9d5 | 2065 | case BT_SECURITY: |
bd3c9e25 GP |
2066 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2067 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2068 | err = -EINVAL; |
2069 | break; | |
2070 | } | |
2071 | ||
2af6b9d5 MH |
2072 | sec.level = BT_SECURITY_LOW; |
2073 | ||
2074 | len = min_t(unsigned int, sizeof(sec), optlen); | |
2075 | if (copy_from_user((char *) &sec, optval, len)) { | |
2076 | err = -EFAULT; | |
2077 | break; | |
2078 | } | |
2079 | ||
2080 | if (sec.level < BT_SECURITY_LOW || | |
2081 | sec.level > BT_SECURITY_HIGH) { | |
2082 | err = -EINVAL; | |
2083 | break; | |
2084 | } | |
2085 | ||
2086 | l2cap_pi(sk)->sec_level = sec.level; | |
2087 | break; | |
2088 | ||
f66dc81f MH |
2089 | case BT_DEFER_SETUP: |
2090 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2091 | err = -EINVAL; | |
2092 | break; | |
2093 | } | |
2094 | ||
2095 | if (get_user(opt, (u32 __user *) optval)) { | |
2096 | err = -EFAULT; | |
2097 | break; | |
2098 | } | |
2099 | ||
2100 | bt_sk(sk)->defer_setup = opt; | |
2101 | break; | |
2102 | ||
e702112f AE |
2103 | case BT_FLUSHABLE: |
2104 | if (get_user(opt, (u32 __user *) optval)) { | |
2105 | err = -EFAULT; | |
2106 | break; | |
2107 | } | |
2108 | ||
2109 | if (opt > BT_FLUSHABLE_ON) { | |
2110 | err = -EINVAL; | |
2111 | break; | |
2112 | } | |
2113 | ||
2114 | if (opt == BT_FLUSHABLE_OFF) { | |
2115 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
2116 | /* proceed futher only when we have l2cap_conn and | |
2117 | No Flush support in the LM */ | |
2118 | if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { | |
2119 | err = -EINVAL; | |
2120 | break; | |
2121 | } | |
2122 | } | |
2123 | ||
2124 | l2cap_pi(sk)->flushable = opt; | |
2125 | break; | |
2126 | ||
d58daf42 MH |
2127 | default: |
2128 | err = -ENOPROTOOPT; | |
2129 | break; | |
2130 | } | |
2131 | ||
2132 | release_sock(sk); | |
2133 | return err; | |
2134 | } | |
2135 | ||
2136 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
2137 | { |
2138 | struct sock *sk = sock->sk; | |
2139 | struct l2cap_options opts; | |
2140 | struct l2cap_conninfo cinfo; | |
2141 | int len, err = 0; | |
2af6b9d5 | 2142 | u32 opt; |
1da177e4 LT |
2143 | |
2144 | BT_DBG("sk %p", sk); | |
2145 | ||
2146 | if (get_user(len, optlen)) | |
2147 | return -EFAULT; | |
2148 | ||
2149 | lock_sock(sk); | |
2150 | ||
2151 | switch (optname) { | |
2152 | case L2CAP_OPTIONS: | |
2153 | opts.imtu = l2cap_pi(sk)->imtu; | |
2154 | opts.omtu = l2cap_pi(sk)->omtu; | |
2155 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 2156 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 2157 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 2158 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 2159 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
2160 | |
2161 | len = min_t(unsigned int, len, sizeof(opts)); | |
2162 | if (copy_to_user(optval, (char *) &opts, len)) | |
2163 | err = -EFAULT; | |
2164 | ||
2165 | break; | |
2166 | ||
2167 | case L2CAP_LM: | |
2af6b9d5 MH |
2168 | switch (l2cap_pi(sk)->sec_level) { |
2169 | case BT_SECURITY_LOW: | |
2170 | opt = L2CAP_LM_AUTH; | |
2171 | break; | |
2172 | case BT_SECURITY_MEDIUM: | |
2173 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
2174 | break; | |
2175 | case BT_SECURITY_HIGH: | |
2176 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
2177 | L2CAP_LM_SECURE; | |
2178 | break; | |
2179 | default: | |
2180 | opt = 0; | |
2181 | break; | |
2182 | } | |
2183 | ||
2184 | if (l2cap_pi(sk)->role_switch) | |
2185 | opt |= L2CAP_LM_MASTER; | |
2186 | ||
2187 | if (l2cap_pi(sk)->force_reliable) | |
2188 | opt |= L2CAP_LM_RELIABLE; | |
2189 | ||
2190 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
2191 | err = -EFAULT; |
2192 | break; | |
2193 | ||
2194 | case L2CAP_CONNINFO: | |
f66dc81f MH |
2195 | if (sk->sk_state != BT_CONNECTED && |
2196 | !(sk->sk_state == BT_CONNECT2 && | |
2197 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
2198 | err = -ENOTCONN; |
2199 | break; | |
2200 | } | |
2201 | ||
2202 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
2203 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
2204 | ||
2205 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
2206 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
2207 | err = -EFAULT; | |
2208 | ||
2209 | break; | |
2210 | ||
2211 | default: | |
2212 | err = -ENOPROTOOPT; | |
2213 | break; | |
2214 | } | |
2215 | ||
2216 | release_sock(sk); | |
2217 | return err; | |
2218 | } | |
2219 | ||
d58daf42 MH |
2220 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
2221 | { | |
2222 | struct sock *sk = sock->sk; | |
2af6b9d5 | 2223 | struct bt_security sec; |
d58daf42 MH |
2224 | int len, err = 0; |
2225 | ||
2226 | BT_DBG("sk %p", sk); | |
2227 | ||
2228 | if (level == SOL_L2CAP) | |
2229 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
2230 | ||
0588d94f MH |
2231 | if (level != SOL_BLUETOOTH) |
2232 | return -ENOPROTOOPT; | |
2233 | ||
d58daf42 MH |
2234 | if (get_user(len, optlen)) |
2235 | return -EFAULT; | |
2236 | ||
2237 | lock_sock(sk); | |
2238 | ||
2239 | switch (optname) { | |
2af6b9d5 | 2240 | case BT_SECURITY: |
bd3c9e25 GP |
2241 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2242 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2243 | err = -EINVAL; |
2244 | break; | |
2245 | } | |
2246 | ||
2af6b9d5 MH |
2247 | sec.level = l2cap_pi(sk)->sec_level; |
2248 | ||
2249 | len = min_t(unsigned int, len, sizeof(sec)); | |
2250 | if (copy_to_user(optval, (char *) &sec, len)) | |
2251 | err = -EFAULT; | |
2252 | ||
2253 | break; | |
2254 | ||
f66dc81f MH |
2255 | case BT_DEFER_SETUP: |
2256 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2257 | err = -EINVAL; | |
2258 | break; | |
2259 | } | |
2260 | ||
2261 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2262 | err = -EFAULT; | |
2263 | ||
2264 | break; | |
2265 | ||
e702112f AE |
2266 | case BT_FLUSHABLE: |
2267 | if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval)) | |
2268 | err = -EFAULT; | |
2269 | ||
2270 | break; | |
2271 | ||
d58daf42 MH |
2272 | default: |
2273 | err = -ENOPROTOOPT; | |
2274 | break; | |
2275 | } | |
2276 | ||
2277 | release_sock(sk); | |
2278 | return err; | |
2279 | } | |
2280 | ||
1da177e4 LT |
2281 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2282 | { | |
2283 | struct sock *sk = sock->sk; | |
2284 | int err = 0; | |
2285 | ||
2286 | BT_DBG("sock %p, sk %p", sock, sk); | |
2287 | ||
2288 | if (!sk) | |
2289 | return 0; | |
2290 | ||
2291 | lock_sock(sk); | |
2292 | if (!sk->sk_shutdown) { | |
6161c038 GP |
2293 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2294 | err = __l2cap_wait_ack(sk); | |
2295 | ||
1da177e4 LT |
2296 | sk->sk_shutdown = SHUTDOWN_MASK; |
2297 | l2cap_sock_clear_timer(sk); | |
2298 | __l2cap_sock_close(sk, 0); | |
2299 | ||
2300 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2301 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2302 | sk->sk_lingertime); | |
1da177e4 | 2303 | } |
9b108fc0 GP |
2304 | |
2305 | if (!err && sk->sk_err) | |
2306 | err = -sk->sk_err; | |
2307 | ||
1da177e4 LT |
2308 | release_sock(sk); |
2309 | return err; | |
2310 | } | |
2311 | ||
2312 | static int l2cap_sock_release(struct socket *sock) | |
2313 | { | |
2314 | struct sock *sk = sock->sk; | |
2315 | int err; | |
2316 | ||
2317 | BT_DBG("sock %p, sk %p", sock, sk); | |
2318 | ||
2319 | if (!sk) | |
2320 | return 0; | |
2321 | ||
2322 | err = l2cap_sock_shutdown(sock, 2); | |
2323 | ||
2324 | sock_orphan(sk); | |
2325 | l2cap_sock_kill(sk); | |
2326 | return err; | |
2327 | } | |
2328 | ||
1da177e4 LT |
2329 | static void l2cap_chan_ready(struct sock *sk) |
2330 | { | |
2331 | struct sock *parent = bt_sk(sk)->parent; | |
2332 | ||
2333 | BT_DBG("sk %p, parent %p", sk, parent); | |
2334 | ||
2335 | l2cap_pi(sk)->conf_state = 0; | |
2336 | l2cap_sock_clear_timer(sk); | |
2337 | ||
2338 | if (!parent) { | |
2339 | /* Outgoing channel. | |
2340 | * Wake up socket sleeping on connect. | |
2341 | */ | |
2342 | sk->sk_state = BT_CONNECTED; | |
2343 | sk->sk_state_change(sk); | |
2344 | } else { | |
2345 | /* Incoming channel. | |
2346 | * Wake up socket sleeping on accept. | |
2347 | */ | |
2348 | parent->sk_data_ready(parent, 0); | |
2349 | } | |
2350 | } | |
2351 | ||
2352 | /* Copy frame to all raw sockets on that connection */ | |
2353 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2354 | { | |
2355 | struct l2cap_chan_list *l = &conn->chan_list; | |
2356 | struct sk_buff *nskb; | |
af05b30b | 2357 | struct sock *sk; |
1da177e4 LT |
2358 | |
2359 | BT_DBG("conn %p", conn); | |
2360 | ||
2361 | read_lock(&l->lock); | |
2362 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2363 | if (sk->sk_type != SOCK_RAW) | |
2364 | continue; | |
2365 | ||
2366 | /* Don't send frame to the socket it came from */ | |
2367 | if (skb->sk == sk) | |
2368 | continue; | |
af05b30b GP |
2369 | nskb = skb_clone(skb, GFP_ATOMIC); |
2370 | if (!nskb) | |
1da177e4 LT |
2371 | continue; |
2372 | ||
2373 | if (sock_queue_rcv_skb(sk, nskb)) | |
2374 | kfree_skb(nskb); | |
2375 | } | |
2376 | read_unlock(&l->lock); | |
2377 | } | |
2378 | ||
2379 | /* ---- L2CAP signalling commands ---- */ | |
2380 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2381 | u8 code, u8 ident, u16 dlen, void *data) | |
2382 | { | |
2383 | struct sk_buff *skb, **frag; | |
2384 | struct l2cap_cmd_hdr *cmd; | |
2385 | struct l2cap_hdr *lh; | |
2386 | int len, count; | |
2387 | ||
af05b30b GP |
2388 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2389 | conn, code, ident, dlen); | |
1da177e4 LT |
2390 | |
2391 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2392 | count = min_t(unsigned int, conn->mtu, len); | |
2393 | ||
2394 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2395 | if (!skb) | |
2396 | return NULL; | |
2397 | ||
2398 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2399 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2400 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2401 | |
2402 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2403 | cmd->code = code; | |
2404 | cmd->ident = ident; | |
aca3192c | 2405 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2406 | |
2407 | if (dlen) { | |
2408 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2409 | memcpy(skb_put(skb, count), data, count); | |
2410 | data += count; | |
2411 | } | |
2412 | ||
2413 | len -= skb->len; | |
2414 | ||
2415 | /* Continuation fragments (no L2CAP header) */ | |
2416 | frag = &skb_shinfo(skb)->frag_list; | |
2417 | while (len) { | |
2418 | count = min_t(unsigned int, conn->mtu, len); | |
2419 | ||
2420 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2421 | if (!*frag) | |
2422 | goto fail; | |
2423 | ||
2424 | memcpy(skb_put(*frag, count), data, count); | |
2425 | ||
2426 | len -= count; | |
2427 | data += count; | |
2428 | ||
2429 | frag = &(*frag)->next; | |
2430 | } | |
2431 | ||
2432 | return skb; | |
2433 | ||
2434 | fail: | |
2435 | kfree_skb(skb); | |
2436 | return NULL; | |
2437 | } | |
2438 | ||
2439 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2440 | { | |
2441 | struct l2cap_conf_opt *opt = *ptr; | |
2442 | int len; | |
2443 | ||
2444 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2445 | *ptr += len; | |
2446 | ||
2447 | *type = opt->type; | |
2448 | *olen = opt->len; | |
2449 | ||
2450 | switch (opt->len) { | |
2451 | case 1: | |
2452 | *val = *((u8 *) opt->val); | |
2453 | break; | |
2454 | ||
2455 | case 2: | |
bfaaeb3e | 2456 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2457 | break; |
2458 | ||
2459 | case 4: | |
bfaaeb3e | 2460 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2461 | break; |
2462 | ||
2463 | default: | |
2464 | *val = (unsigned long) opt->val; | |
2465 | break; | |
2466 | } | |
2467 | ||
2468 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2469 | return len; | |
2470 | } | |
2471 | ||
1da177e4 LT |
2472 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2473 | { | |
2474 | struct l2cap_conf_opt *opt = *ptr; | |
2475 | ||
2476 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2477 | ||
2478 | opt->type = type; | |
2479 | opt->len = len; | |
2480 | ||
2481 | switch (len) { | |
2482 | case 1: | |
2483 | *((u8 *) opt->val) = val; | |
2484 | break; | |
2485 | ||
2486 | case 2: | |
4f8b691c | 2487 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2488 | break; |
2489 | ||
2490 | case 4: | |
4f8b691c | 2491 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2492 | break; |
2493 | ||
2494 | default: | |
2495 | memcpy(opt->val, (void *) val, len); | |
2496 | break; | |
2497 | } | |
2498 | ||
2499 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2500 | } | |
2501 | ||
c1b4f43b GP |
2502 | static void l2cap_ack_timeout(unsigned long arg) |
2503 | { | |
2504 | struct sock *sk = (void *) arg; | |
2505 | ||
2506 | bh_lock_sock(sk); | |
2507 | l2cap_send_ack(l2cap_pi(sk)); | |
2508 | bh_unlock_sock(sk); | |
2509 | } | |
2510 | ||
0565c1c2 GP |
2511 | static inline void l2cap_ertm_init(struct sock *sk) |
2512 | { | |
2513 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2514 | l2cap_pi(sk)->unacked_frames = 0; | |
2515 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2516 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2517 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2518 | |
2519 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2520 | l2cap_retrans_timeout, (unsigned long) sk); | |
2521 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2522 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2523 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2524 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2525 | |
2526 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
2527 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
2528 | ||
2529 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
218bb9df GP |
2530 | |
2531 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
2532 | } |
2533 | ||
f2fcfcd6 GP |
2534 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2535 | { | |
2536 | switch (mode) { | |
2537 | case L2CAP_MODE_STREAMING: | |
2538 | case L2CAP_MODE_ERTM: | |
2539 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2540 | return mode; | |
2541 | /* fall through */ | |
2542 | default: | |
2543 | return L2CAP_MODE_BASIC; | |
2544 | } | |
2545 | } | |
2546 | ||
1da177e4 LT |
2547 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2548 | { | |
2549 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2550 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2551 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2552 | void *ptr = req->data; |
2553 | ||
2554 | BT_DBG("sk %p", sk); | |
2555 | ||
f2fcfcd6 GP |
2556 | if (pi->num_conf_req || pi->num_conf_rsp) |
2557 | goto done; | |
2558 | ||
2559 | switch (pi->mode) { | |
2560 | case L2CAP_MODE_STREAMING: | |
2561 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 2562 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 2563 | break; |
85eb53c6 | 2564 | |
2ba13ed6 | 2565 | /* fall through */ |
f2fcfcd6 GP |
2566 | default: |
2567 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2568 | break; | |
2569 | } | |
2570 | ||
2571 | done: | |
7990681c GP |
2572 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
2573 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
2574 | ||
65c7c491 MH |
2575 | switch (pi->mode) { |
2576 | case L2CAP_MODE_BASIC: | |
63406504 GP |
2577 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2578 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
2579 | break; | |
2580 | ||
62547752 GP |
2581 | rfc.mode = L2CAP_MODE_BASIC; |
2582 | rfc.txwin_size = 0; | |
2583 | rfc.max_transmit = 0; | |
2584 | rfc.retrans_timeout = 0; | |
2585 | rfc.monitor_timeout = 0; | |
2586 | rfc.max_pdu_size = 0; | |
2587 | ||
63406504 GP |
2588 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2589 | (unsigned long) &rfc); | |
65c7c491 MH |
2590 | break; |
2591 | ||
2592 | case L2CAP_MODE_ERTM: | |
2593 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2594 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2595 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2596 | rfc.retrans_timeout = 0; |
2597 | rfc.monitor_timeout = 0; | |
c74e560c | 2598 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2599 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2600 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 2601 | |
63406504 GP |
2602 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2603 | (unsigned long) &rfc); | |
2604 | ||
fcc203c3 GP |
2605 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2606 | break; | |
2607 | ||
2608 | if (pi->fcs == L2CAP_FCS_NONE || | |
2609 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2610 | pi->fcs = L2CAP_FCS_NONE; | |
2611 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2612 | } | |
f2fcfcd6 GP |
2613 | break; |
2614 | ||
2615 | case L2CAP_MODE_STREAMING: | |
2616 | rfc.mode = L2CAP_MODE_STREAMING; | |
2617 | rfc.txwin_size = 0; | |
2618 | rfc.max_transmit = 0; | |
2619 | rfc.retrans_timeout = 0; | |
2620 | rfc.monitor_timeout = 0; | |
c74e560c | 2621 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2622 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2623 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 2624 | |
63406504 GP |
2625 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2626 | (unsigned long) &rfc); | |
2627 | ||
fcc203c3 GP |
2628 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2629 | break; | |
2630 | ||
2631 | if (pi->fcs == L2CAP_FCS_NONE || | |
2632 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2633 | pi->fcs = L2CAP_FCS_NONE; | |
2634 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2635 | } | |
65c7c491 MH |
2636 | break; |
2637 | } | |
1da177e4 LT |
2638 | |
2639 | /* FIXME: Need actual value of the flush timeout */ | |
2640 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2641 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2642 | ||
aca3192c YH |
2643 | req->dcid = cpu_to_le16(pi->dcid); |
2644 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2645 | |
2646 | return ptr - data; | |
2647 | } | |
2648 | ||
5dee9e7c | 2649 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2650 | { |
2651 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2652 | struct l2cap_conf_rsp *rsp = data; |
2653 | void *ptr = rsp->data; | |
2654 | void *req = pi->conf_req; | |
2655 | int len = pi->conf_len; | |
2656 | int type, hint, olen; | |
2657 | unsigned long val; | |
6464f35f | 2658 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2659 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2660 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2661 | |
5dee9e7c | 2662 | BT_DBG("sk %p", sk); |
820ae1b8 | 2663 | |
5dee9e7c MH |
2664 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2665 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2666 | |
589d2746 | 2667 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2668 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2669 | |
2670 | switch (type) { | |
2671 | case L2CAP_CONF_MTU: | |
861d6882 | 2672 | mtu = val; |
5dee9e7c MH |
2673 | break; |
2674 | ||
2675 | case L2CAP_CONF_FLUSH_TO: | |
2676 | pi->flush_to = val; | |
2677 | break; | |
2678 | ||
2679 | case L2CAP_CONF_QOS: | |
2680 | break; | |
2681 | ||
6464f35f MH |
2682 | case L2CAP_CONF_RFC: |
2683 | if (olen == sizeof(rfc)) | |
2684 | memcpy(&rfc, (void *) val, olen); | |
2685 | break; | |
2686 | ||
fcc203c3 GP |
2687 | case L2CAP_CONF_FCS: |
2688 | if (val == L2CAP_FCS_NONE) | |
2689 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2690 | ||
2691 | break; | |
2692 | ||
5dee9e7c MH |
2693 | default: |
2694 | if (hint) | |
2695 | break; | |
2696 | ||
2697 | result = L2CAP_CONF_UNKNOWN; | |
2698 | *((u8 *) ptr++) = type; | |
2699 | break; | |
2700 | } | |
2701 | } | |
2702 | ||
e9aeb2dd | 2703 | if (pi->num_conf_rsp || pi->num_conf_req > 1) |
f2fcfcd6 GP |
2704 | goto done; |
2705 | ||
2706 | switch (pi->mode) { | |
2707 | case L2CAP_MODE_STREAMING: | |
2708 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
2709 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
2710 | pi->mode = l2cap_select_mode(rfc.mode, | |
2711 | pi->conn->feat_mask); | |
2712 | break; | |
2713 | } | |
2714 | ||
742e519b | 2715 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 2716 | return -ECONNREFUSED; |
742e519b | 2717 | |
f2fcfcd6 | 2718 | break; |
f2fcfcd6 GP |
2719 | } |
2720 | ||
2721 | done: | |
2722 | if (pi->mode != rfc.mode) { | |
2723 | result = L2CAP_CONF_UNACCEPT; | |
2724 | rfc.mode = pi->mode; | |
2725 | ||
2726 | if (pi->num_conf_rsp == 1) | |
2727 | return -ECONNREFUSED; | |
2728 | ||
2729 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2730 | sizeof(rfc), (unsigned long) &rfc); | |
2731 | } | |
2732 | ||
2733 | ||
5dee9e7c MH |
2734 | if (result == L2CAP_CONF_SUCCESS) { |
2735 | /* Configure output options and let the other side know | |
2736 | * which ones we don't like. */ | |
2737 | ||
f2fcfcd6 GP |
2738 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2739 | result = L2CAP_CONF_UNACCEPT; | |
2740 | else { | |
2741 | pi->omtu = mtu; | |
2742 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2743 | } | |
2744 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2745 | |
f2fcfcd6 GP |
2746 | switch (rfc.mode) { |
2747 | case L2CAP_MODE_BASIC: | |
2748 | pi->fcs = L2CAP_FCS_NONE; | |
2749 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2750 | break; | |
2751 | ||
2752 | case L2CAP_MODE_ERTM: | |
2753 | pi->remote_tx_win = rfc.txwin_size; | |
2754 | pi->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
2755 | |
2756 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
2757 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
2758 | |
2759 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2760 | |
10467e9e GP |
2761 | rfc.retrans_timeout = |
2762 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2763 | rfc.monitor_timeout = | |
2764 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2765 | |
2766 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2767 | |
2768 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2769 | sizeof(rfc), (unsigned long) &rfc); | |
2770 | ||
f2fcfcd6 GP |
2771 | break; |
2772 | ||
2773 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
2774 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
2775 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
2776 | |
2777 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2778 | |
2779 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2780 | |
2781 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2782 | sizeof(rfc), (unsigned long) &rfc); | |
2783 | ||
f2fcfcd6 GP |
2784 | break; |
2785 | ||
2786 | default: | |
5dee9e7c | 2787 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2788 | |
6464f35f | 2789 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2790 | rfc.mode = pi->mode; |
2791 | } | |
6464f35f | 2792 | |
f2fcfcd6 GP |
2793 | if (result == L2CAP_CONF_SUCCESS) |
2794 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2795 | } | |
5dee9e7c MH |
2796 | rsp->scid = cpu_to_le16(pi->dcid); |
2797 | rsp->result = cpu_to_le16(result); | |
2798 | rsp->flags = cpu_to_le16(0x0000); | |
2799 | ||
2800 | return ptr - data; | |
1da177e4 LT |
2801 | } |
2802 | ||
f2fcfcd6 GP |
2803 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2804 | { | |
2805 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2806 | struct l2cap_conf_req *req = data; | |
2807 | void *ptr = req->data; | |
2808 | int type, olen; | |
2809 | unsigned long val; | |
2810 | struct l2cap_conf_rfc rfc; | |
2811 | ||
2812 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2813 | ||
2814 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2815 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2816 | ||
2817 | switch (type) { | |
2818 | case L2CAP_CONF_MTU: | |
2819 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2820 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 2821 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2822 | } else |
8183b775 AE |
2823 | pi->imtu = val; |
2824 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
2825 | break; |
2826 | ||
2827 | case L2CAP_CONF_FLUSH_TO: | |
2828 | pi->flush_to = val; | |
2829 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2830 | 2, pi->flush_to); | |
2831 | break; | |
2832 | ||
2833 | case L2CAP_CONF_RFC: | |
2834 | if (olen == sizeof(rfc)) | |
2835 | memcpy(&rfc, (void *)val, olen); | |
2836 | ||
2837 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2838 | rfc.mode != pi->mode) | |
2839 | return -ECONNREFUSED; | |
2840 | ||
f2fcfcd6 GP |
2841 | pi->fcs = 0; |
2842 | ||
2843 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2844 | sizeof(rfc), (unsigned long) &rfc); | |
2845 | break; | |
2846 | } | |
2847 | } | |
2848 | ||
6c2ea7a8 GP |
2849 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
2850 | return -ECONNREFUSED; | |
2851 | ||
2852 | pi->mode = rfc.mode; | |
2853 | ||
f2fcfcd6 GP |
2854 | if (*result == L2CAP_CONF_SUCCESS) { |
2855 | switch (rfc.mode) { | |
2856 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2857 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2858 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2859 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2860 | break; |
2861 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2862 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2863 | } |
2864 | } | |
2865 | ||
2866 | req->dcid = cpu_to_le16(pi->dcid); | |
2867 | req->flags = cpu_to_le16(0x0000); | |
2868 | ||
2869 | return ptr - data; | |
2870 | } | |
2871 | ||
5dee9e7c | 2872 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2873 | { |
2874 | struct l2cap_conf_rsp *rsp = data; | |
2875 | void *ptr = rsp->data; | |
1da177e4 | 2876 | |
5dee9e7c | 2877 | BT_DBG("sk %p", sk); |
1da177e4 | 2878 | |
aca3192c | 2879 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2880 | rsp->result = cpu_to_le16(result); |
aca3192c | 2881 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2882 | |
2883 | return ptr - data; | |
2884 | } | |
2885 | ||
7b1c0049 GP |
2886 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2887 | { | |
2888 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2889 | int type, olen; | |
2890 | unsigned long val; | |
2891 | struct l2cap_conf_rfc rfc; | |
2892 | ||
2893 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2894 | ||
2895 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2896 | return; | |
2897 | ||
2898 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2899 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2900 | ||
2901 | switch (type) { | |
2902 | case L2CAP_CONF_RFC: | |
2903 | if (olen == sizeof(rfc)) | |
2904 | memcpy(&rfc, (void *)val, olen); | |
2905 | goto done; | |
2906 | } | |
2907 | } | |
2908 | ||
2909 | done: | |
2910 | switch (rfc.mode) { | |
2911 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2912 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2913 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2914 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2915 | break; | |
2916 | case L2CAP_MODE_STREAMING: | |
2917 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2918 | } | |
2919 | } | |
2920 | ||
4e8402a3 MH |
2921 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2922 | { | |
2923 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2924 | ||
2925 | if (rej->reason != 0x0000) | |
2926 | return 0; | |
2927 | ||
2928 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2929 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2930 | del_timer(&conn->info_timer); |
984947dc MH |
2931 | |
2932 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2933 | conn->info_ident = 0; |
984947dc | 2934 | |
4e8402a3 MH |
2935 | l2cap_conn_start(conn); |
2936 | } | |
2937 | ||
2938 | return 0; | |
2939 | } | |
2940 | ||
1da177e4 LT |
2941 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2942 | { | |
2943 | struct l2cap_chan_list *list = &conn->chan_list; | |
2944 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2945 | struct l2cap_conn_rsp rsp; | |
d793fe8c | 2946 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2947 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2948 | |
2949 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2950 | __le16 psm = req->psm; |
1da177e4 LT |
2951 | |
2952 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2953 | ||
2954 | /* Check if we have socket listening on psm */ | |
2955 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2956 | if (!parent) { | |
2957 | result = L2CAP_CR_BAD_PSM; | |
2958 | goto sendresp; | |
2959 | } | |
2960 | ||
e0f0cb56 GP |
2961 | bh_lock_sock(parent); |
2962 | ||
e7c29cb1 MH |
2963 | /* Check if the ACL is secure enough (if not SDP) */ |
2964 | if (psm != cpu_to_le16(0x0001) && | |
2965 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2966 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2967 | result = L2CAP_CR_SEC_BLOCK; |
2968 | goto response; | |
2969 | } | |
2970 | ||
1da177e4 LT |
2971 | result = L2CAP_CR_NO_MEM; |
2972 | ||
2973 | /* Check for backlog size */ | |
2974 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2975 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2976 | goto response; |
2977 | } | |
2978 | ||
3b1e0a65 | 2979 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2980 | if (!sk) |
2981 | goto response; | |
2982 | ||
fd1278d7 | 2983 | write_lock_bh(&list->lock); |
1da177e4 LT |
2984 | |
2985 | /* Check if we already have channel with that dcid */ | |
2986 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2987 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2988 | sock_set_flag(sk, SOCK_ZAPPED); |
2989 | l2cap_sock_kill(sk); | |
2990 | goto response; | |
2991 | } | |
2992 | ||
2993 | hci_conn_hold(conn->hcon); | |
2994 | ||
2995 | l2cap_sock_init(sk, parent); | |
2996 | bacpy(&bt_sk(sk)->src, conn->src); | |
2997 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2998 | l2cap_pi(sk)->psm = psm; | |
2999 | l2cap_pi(sk)->dcid = scid; | |
3000 | ||
3001 | __l2cap_chan_add(conn, sk, parent); | |
3002 | dcid = l2cap_pi(sk)->scid; | |
3003 | ||
3004 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
3005 | ||
1da177e4 LT |
3006 | l2cap_pi(sk)->ident = cmd->ident; |
3007 | ||
984947dc | 3008 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 3009 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
3010 | if (bt_sk(sk)->defer_setup) { |
3011 | sk->sk_state = BT_CONNECT2; | |
3012 | result = L2CAP_CR_PEND; | |
3013 | status = L2CAP_CS_AUTHOR_PEND; | |
3014 | parent->sk_data_ready(parent, 0); | |
3015 | } else { | |
3016 | sk->sk_state = BT_CONFIG; | |
3017 | result = L2CAP_CR_SUCCESS; | |
3018 | status = L2CAP_CS_NO_INFO; | |
3019 | } | |
79d554a6 MH |
3020 | } else { |
3021 | sk->sk_state = BT_CONNECT2; | |
3022 | result = L2CAP_CR_PEND; | |
3023 | status = L2CAP_CS_AUTHEN_PEND; | |
3024 | } | |
3025 | } else { | |
3026 | sk->sk_state = BT_CONNECT2; | |
3027 | result = L2CAP_CR_PEND; | |
3028 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3029 | } |
3030 | ||
fd1278d7 | 3031 | write_unlock_bh(&list->lock); |
1da177e4 LT |
3032 | |
3033 | response: | |
3034 | bh_unlock_sock(parent); | |
3035 | ||
3036 | sendresp: | |
aca3192c YH |
3037 | rsp.scid = cpu_to_le16(scid); |
3038 | rsp.dcid = cpu_to_le16(dcid); | |
3039 | rsp.result = cpu_to_le16(result); | |
3040 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3041 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3042 | |
3043 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3044 | struct l2cap_info_req info; | |
3045 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3046 | ||
3047 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3048 | conn->info_ident = l2cap_get_ident(conn); | |
3049 | ||
3050 | mod_timer(&conn->info_timer, jiffies + | |
3051 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
3052 | ||
3053 | l2cap_send_cmd(conn, conn->info_ident, | |
3054 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3055 | } | |
3056 | ||
d793fe8c | 3057 | if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
3058 | result == L2CAP_CR_SUCCESS) { |
3059 | u8 buf[128]; | |
3060 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
3061 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
3062 | l2cap_build_conf_req(sk, buf), buf); | |
3063 | l2cap_pi(sk)->num_conf_req++; | |
3064 | } | |
3065 | ||
1da177e4 LT |
3066 | return 0; |
3067 | } | |
3068 | ||
3069 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3070 | { | |
3071 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3072 | u16 scid, dcid, result, status; | |
3073 | struct sock *sk; | |
3074 | u8 req[128]; | |
3075 | ||
3076 | scid = __le16_to_cpu(rsp->scid); | |
3077 | dcid = __le16_to_cpu(rsp->dcid); | |
3078 | result = __le16_to_cpu(rsp->result); | |
3079 | status = __le16_to_cpu(rsp->status); | |
3080 | ||
3081 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
3082 | ||
3083 | if (scid) { | |
af05b30b GP |
3084 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3085 | if (!sk) | |
57d3b22b | 3086 | return -EFAULT; |
1da177e4 | 3087 | } else { |
af05b30b GP |
3088 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
3089 | if (!sk) | |
57d3b22b | 3090 | return -EFAULT; |
1da177e4 LT |
3091 | } |
3092 | ||
3093 | switch (result) { | |
3094 | case L2CAP_CR_SUCCESS: | |
3095 | sk->sk_state = BT_CONFIG; | |
3096 | l2cap_pi(sk)->ident = 0; | |
3097 | l2cap_pi(sk)->dcid = dcid; | |
6a8d3010 MH |
3098 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
3099 | ||
e9aeb2dd GP |
3100 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
3101 | break; | |
3102 | ||
3103 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
3104 | ||
1da177e4 LT |
3105 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3106 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 3107 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3108 | break; |
3109 | ||
3110 | case L2CAP_CR_PEND: | |
6a8d3010 | 3111 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
3112 | break; |
3113 | ||
3114 | default: | |
a49184c2 AE |
3115 | /* don't delete l2cap channel if sk is owned by user */ |
3116 | if (sock_owned_by_user(sk)) { | |
3117 | sk->sk_state = BT_DISCONN; | |
3118 | l2cap_sock_clear_timer(sk); | |
3119 | l2cap_sock_set_timer(sk, HZ / 5); | |
3120 | break; | |
3121 | } | |
3122 | ||
1da177e4 LT |
3123 | l2cap_chan_del(sk, ECONNREFUSED); |
3124 | break; | |
3125 | } | |
3126 | ||
3127 | bh_unlock_sock(sk); | |
3128 | return 0; | |
3129 | } | |
3130 | ||
8c462b60 MM |
3131 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
3132 | { | |
3133 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3134 | * sides request it. | |
3135 | */ | |
3136 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
3137 | pi->fcs = L2CAP_FCS_NONE; | |
3138 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
3139 | pi->fcs = L2CAP_FCS_CRC16; | |
3140 | } | |
3141 | ||
88219a0f | 3142 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3143 | { |
3144 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3145 | u16 dcid, flags; | |
3146 | u8 rsp[64]; | |
3147 | struct sock *sk; | |
5dee9e7c | 3148 | int len; |
1da177e4 LT |
3149 | |
3150 | dcid = __le16_to_cpu(req->dcid); | |
3151 | flags = __le16_to_cpu(req->flags); | |
3152 | ||
3153 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3154 | ||
af05b30b GP |
3155 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3156 | if (!sk) | |
1da177e4 LT |
3157 | return -ENOENT; |
3158 | ||
df6bd743 GP |
3159 | if (sk->sk_state != BT_CONFIG) { |
3160 | struct l2cap_cmd_rej rej; | |
3161 | ||
3162 | rej.reason = cpu_to_le16(0x0002); | |
3163 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
3164 | sizeof(rej), &rej); | |
354f60a9 | 3165 | goto unlock; |
df6bd743 | 3166 | } |
354f60a9 | 3167 | |
5dee9e7c | 3168 | /* Reject if config buffer is too small. */ |
88219a0f | 3169 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
3170 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
3171 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3172 | l2cap_build_conf_rsp(sk, rsp, | |
3173 | L2CAP_CONF_REJECT, flags), rsp); | |
3174 | goto unlock; | |
3175 | } | |
3176 | ||
3177 | /* Store config. */ | |
3178 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
3179 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
3180 | |
3181 | if (flags & 0x0001) { | |
3182 | /* Incomplete config. Send empty response. */ | |
3183 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
3184 | l2cap_build_conf_rsp(sk, rsp, |
3185 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
3186 | goto unlock; |
3187 | } | |
3188 | ||
3189 | /* Complete config. */ | |
5dee9e7c | 3190 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 3191 | if (len < 0) { |
9b108fc0 | 3192 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 3193 | goto unlock; |
f2fcfcd6 | 3194 | } |
1da177e4 | 3195 | |
5dee9e7c | 3196 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 3197 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 3198 | |
5dee9e7c MH |
3199 | /* Reset config buffer. */ |
3200 | l2cap_pi(sk)->conf_len = 0; | |
3201 | ||
876d9484 MH |
3202 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
3203 | goto unlock; | |
3204 | ||
1da177e4 | 3205 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 3206 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 3207 | |
1da177e4 | 3208 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 3209 | |
0565c1c2 GP |
3210 | l2cap_pi(sk)->next_tx_seq = 0; |
3211 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 3212 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3213 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3214 | l2cap_ertm_init(sk); | |
3215 | ||
1da177e4 | 3216 | l2cap_chan_ready(sk); |
876d9484 MH |
3217 | goto unlock; |
3218 | } | |
3219 | ||
3220 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 3221 | u8 buf[64]; |
ab3e5715 | 3222 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 3223 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 3224 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 3225 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3226 | } |
3227 | ||
3228 | unlock: | |
3229 | bh_unlock_sock(sk); | |
3230 | return 0; | |
3231 | } | |
3232 | ||
3233 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3234 | { | |
3235 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3236 | u16 scid, flags, result; | |
3237 | struct sock *sk; | |
7b1c0049 | 3238 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
3239 | |
3240 | scid = __le16_to_cpu(rsp->scid); | |
3241 | flags = __le16_to_cpu(rsp->flags); | |
3242 | result = __le16_to_cpu(rsp->result); | |
3243 | ||
af05b30b GP |
3244 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
3245 | scid, flags, result); | |
1da177e4 | 3246 | |
af05b30b GP |
3247 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3248 | if (!sk) | |
1da177e4 LT |
3249 | return 0; |
3250 | ||
3251 | switch (result) { | |
3252 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 3253 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
3254 | break; |
3255 | ||
3256 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 3257 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3258 | char req[64]; |
3259 | ||
c2c77ec8 | 3260 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 3261 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
3262 | goto done; |
3263 | } | |
3264 | ||
f2fcfcd6 GP |
3265 | /* throw out any old stored conf requests */ |
3266 | result = L2CAP_CONF_SUCCESS; | |
3267 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
3268 | len, req, &result); | |
3269 | if (len < 0) { | |
9b108fc0 | 3270 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
3271 | goto done; |
3272 | } | |
3273 | ||
3274 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3275 | L2CAP_CONF_REQ, len, req); | |
3276 | l2cap_pi(sk)->num_conf_req++; | |
3277 | if (result != L2CAP_CONF_SUCCESS) | |
3278 | goto done; | |
3279 | break; | |
1da177e4 LT |
3280 | } |
3281 | ||
8e87d142 | 3282 | default: |
b1235d79 | 3283 | sk->sk_err = ECONNRESET; |
1da177e4 | 3284 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 3285 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
3286 | goto done; |
3287 | } | |
3288 | ||
3289 | if (flags & 0x01) | |
3290 | goto done; | |
3291 | ||
1da177e4 LT |
3292 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3293 | ||
3294 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 3295 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 3296 | |
1da177e4 | 3297 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3298 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3299 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3300 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3301 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3302 | l2cap_ertm_init(sk); | |
3303 | ||
1da177e4 LT |
3304 | l2cap_chan_ready(sk); |
3305 | } | |
3306 | ||
3307 | done: | |
3308 | bh_unlock_sock(sk); | |
3309 | return 0; | |
3310 | } | |
3311 | ||
3312 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3313 | { | |
3314 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3315 | struct l2cap_disconn_rsp rsp; | |
3316 | u16 dcid, scid; | |
3317 | struct sock *sk; | |
3318 | ||
3319 | scid = __le16_to_cpu(req->scid); | |
3320 | dcid = __le16_to_cpu(req->dcid); | |
3321 | ||
3322 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3323 | ||
af05b30b GP |
3324 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3325 | if (!sk) | |
1da177e4 LT |
3326 | return 0; |
3327 | ||
aca3192c YH |
3328 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3329 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3330 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3331 | ||
3332 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3333 | ||
a49184c2 AE |
3334 | /* don't delete l2cap channel if sk is owned by user */ |
3335 | if (sock_owned_by_user(sk)) { | |
3336 | sk->sk_state = BT_DISCONN; | |
3337 | l2cap_sock_clear_timer(sk); | |
3338 | l2cap_sock_set_timer(sk, HZ / 5); | |
3339 | bh_unlock_sock(sk); | |
3340 | return 0; | |
3341 | } | |
3342 | ||
1da177e4 LT |
3343 | l2cap_chan_del(sk, ECONNRESET); |
3344 | bh_unlock_sock(sk); | |
3345 | ||
3346 | l2cap_sock_kill(sk); | |
3347 | return 0; | |
3348 | } | |
3349 | ||
3350 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3351 | { | |
3352 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3353 | u16 dcid, scid; | |
3354 | struct sock *sk; | |
3355 | ||
3356 | scid = __le16_to_cpu(rsp->scid); | |
3357 | dcid = __le16_to_cpu(rsp->dcid); | |
3358 | ||
3359 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3360 | ||
af05b30b GP |
3361 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3362 | if (!sk) | |
1da177e4 LT |
3363 | return 0; |
3364 | ||
a49184c2 AE |
3365 | /* don't delete l2cap channel if sk is owned by user */ |
3366 | if (sock_owned_by_user(sk)) { | |
3367 | sk->sk_state = BT_DISCONN; | |
3368 | l2cap_sock_clear_timer(sk); | |
3369 | l2cap_sock_set_timer(sk, HZ / 5); | |
3370 | bh_unlock_sock(sk); | |
3371 | return 0; | |
3372 | } | |
3373 | ||
1da177e4 LT |
3374 | l2cap_chan_del(sk, 0); |
3375 | bh_unlock_sock(sk); | |
3376 | ||
3377 | l2cap_sock_kill(sk); | |
3378 | return 0; | |
3379 | } | |
3380 | ||
3381 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3382 | { | |
3383 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3384 | u16 type; |
3385 | ||
3386 | type = __le16_to_cpu(req->type); | |
3387 | ||
3388 | BT_DBG("type 0x%4.4x", type); | |
3389 | ||
f0709e03 MH |
3390 | if (type == L2CAP_IT_FEAT_MASK) { |
3391 | u8 buf[8]; | |
44dd46de | 3392 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3393 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3394 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3395 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3396 | if (!disable_ertm) |
fcc203c3 GP |
3397 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3398 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3399 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3400 | l2cap_send_cmd(conn, cmd->ident, |
3401 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3402 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3403 | u8 buf[12]; | |
3404 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3405 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3406 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3407 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3408 | l2cap_send_cmd(conn, cmd->ident, | |
3409 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3410 | } else { |
3411 | struct l2cap_info_rsp rsp; | |
3412 | rsp.type = cpu_to_le16(type); | |
3413 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3414 | l2cap_send_cmd(conn, cmd->ident, | |
3415 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3416 | } | |
1da177e4 LT |
3417 | |
3418 | return 0; | |
3419 | } | |
3420 | ||
3421 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3422 | { | |
3423 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3424 | u16 type, result; | |
3425 | ||
3426 | type = __le16_to_cpu(rsp->type); | |
3427 | result = __le16_to_cpu(rsp->result); | |
3428 | ||
3429 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3430 | ||
4e8402a3 MH |
3431 | del_timer(&conn->info_timer); |
3432 | ||
adb08ede VT |
3433 | if (result != L2CAP_IR_SUCCESS) { |
3434 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3435 | conn->info_ident = 0; | |
3436 | ||
3437 | l2cap_conn_start(conn); | |
3438 | ||
3439 | return 0; | |
3440 | } | |
3441 | ||
984947dc | 3442 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3443 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3444 | |
47ec1dcd | 3445 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3446 | struct l2cap_info_req req; |
3447 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3448 | ||
3449 | conn->info_ident = l2cap_get_ident(conn); | |
3450 | ||
3451 | l2cap_send_cmd(conn, conn->info_ident, | |
3452 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3453 | } else { | |
3454 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3455 | conn->info_ident = 0; | |
3456 | ||
3457 | l2cap_conn_start(conn); | |
3458 | } | |
3459 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3460 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3461 | conn->info_ident = 0; |
984947dc MH |
3462 | |
3463 | l2cap_conn_start(conn); | |
3464 | } | |
4e8402a3 | 3465 | |
1da177e4 LT |
3466 | return 0; |
3467 | } | |
3468 | ||
3469 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3470 | { | |
3471 | u8 *data = skb->data; | |
3472 | int len = skb->len; | |
3473 | struct l2cap_cmd_hdr cmd; | |
3474 | int err = 0; | |
3475 | ||
3476 | l2cap_raw_recv(conn, skb); | |
3477 | ||
3478 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3479 | u16 cmd_len; |
1da177e4 LT |
3480 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3481 | data += L2CAP_CMD_HDR_SIZE; | |
3482 | len -= L2CAP_CMD_HDR_SIZE; | |
3483 | ||
88219a0f | 3484 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3485 | |
88219a0f | 3486 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3487 | |
88219a0f | 3488 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3489 | BT_DBG("corrupted command"); |
3490 | break; | |
3491 | } | |
3492 | ||
3493 | switch (cmd.code) { | |
3494 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3495 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3496 | break; |
3497 | ||
3498 | case L2CAP_CONN_REQ: | |
3499 | err = l2cap_connect_req(conn, &cmd, data); | |
3500 | break; | |
3501 | ||
3502 | case L2CAP_CONN_RSP: | |
3503 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3504 | break; | |
3505 | ||
3506 | case L2CAP_CONF_REQ: | |
88219a0f | 3507 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3508 | break; |
3509 | ||
3510 | case L2CAP_CONF_RSP: | |
3511 | err = l2cap_config_rsp(conn, &cmd, data); | |
3512 | break; | |
3513 | ||
3514 | case L2CAP_DISCONN_REQ: | |
3515 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3516 | break; | |
3517 | ||
3518 | case L2CAP_DISCONN_RSP: | |
3519 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3520 | break; | |
3521 | ||
3522 | case L2CAP_ECHO_REQ: | |
88219a0f | 3523 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3524 | break; |
3525 | ||
3526 | case L2CAP_ECHO_RSP: | |
3527 | break; | |
3528 | ||
3529 | case L2CAP_INFO_REQ: | |
3530 | err = l2cap_information_req(conn, &cmd, data); | |
3531 | break; | |
3532 | ||
3533 | case L2CAP_INFO_RSP: | |
3534 | err = l2cap_information_rsp(conn, &cmd, data); | |
3535 | break; | |
3536 | ||
3537 | default: | |
3538 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3539 | err = -EINVAL; | |
3540 | break; | |
3541 | } | |
3542 | ||
3543 | if (err) { | |
3544 | struct l2cap_cmd_rej rej; | |
3545 | BT_DBG("error %d", err); | |
3546 | ||
3547 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3548 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3549 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3550 | } | |
3551 | ||
88219a0f AV |
3552 | data += cmd_len; |
3553 | len -= cmd_len; | |
1da177e4 LT |
3554 | } |
3555 | ||
3556 | kfree_skb(skb); | |
3557 | } | |
3558 | ||
fcc203c3 GP |
3559 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3560 | { | |
3561 | u16 our_fcs, rcv_fcs; | |
3562 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3563 | ||
3564 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3565 | skb_trim(skb, skb->len - 2); | |
3566 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3567 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3568 | ||
3569 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3570 | return -EBADMSG; |
fcc203c3 GP |
3571 | } |
3572 | return 0; | |
3573 | } | |
3574 | ||
d5392c8f GP |
3575 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3576 | { | |
3577 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3578 | u16 control = 0; | |
3579 | ||
3580 | pi->frames_sent = 0; | |
d5392c8f GP |
3581 | |
3582 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3583 | ||
3584 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 3585 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 3586 | l2cap_send_sframe(pi, control); |
1890d36b | 3587 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
3588 | } |
3589 | ||
4ea727ef GP |
3590 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
3591 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
3592 | |
3593 | l2cap_ertm_send(sk); | |
3594 | ||
3595 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3596 | pi->frames_sent == 0) { | |
3597 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3598 | l2cap_send_sframe(pi, control); |
3599 | } | |
3600 | } | |
3601 | ||
9b53350d | 3602 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3603 | { |
3604 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
3605 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3606 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
3607 | |
3608 | bt_cb(skb)->tx_seq = tx_seq; | |
3609 | bt_cb(skb)->sar = sar; | |
3610 | ||
3611 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3612 | if (!next_skb) { | |
3613 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 3614 | return 0; |
8f17154f GP |
3615 | } |
3616 | ||
bfbacc11 JPRV |
3617 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3618 | if (tx_seq_offset < 0) | |
3619 | tx_seq_offset += 64; | |
3620 | ||
8f17154f | 3621 | do { |
9b53350d JPRV |
3622 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3623 | return -EINVAL; | |
3624 | ||
bfbacc11 JPRV |
3625 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
3626 | pi->buffer_seq) % 64; | |
3627 | if (next_tx_seq_offset < 0) | |
3628 | next_tx_seq_offset += 64; | |
3629 | ||
3630 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 3631 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 3632 | return 0; |
8f17154f GP |
3633 | } |
3634 | ||
3635 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3636 | break; | |
3637 | ||
59203a21 | 3638 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3639 | |
3640 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
3641 | |
3642 | return 0; | |
8f17154f GP |
3643 | } |
3644 | ||
18778a63 GP |
3645 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3646 | { | |
3647 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3648 | struct sk_buff *_skb; | |
1890d36b | 3649 | int err; |
18778a63 GP |
3650 | |
3651 | switch (control & L2CAP_CTRL_SAR) { | |
3652 | case L2CAP_SDU_UNSEGMENTED: | |
3653 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3654 | goto drop; | |
3655 | ||
3656 | err = sock_queue_rcv_skb(sk, skb); | |
3657 | if (!err) | |
3658 | return err; | |
3659 | ||
3660 | break; | |
3661 | ||
3662 | case L2CAP_SDU_START: | |
3663 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3664 | goto drop; | |
3665 | ||
3666 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
3667 | |
3668 | if (pi->sdu_len > pi->imtu) | |
3669 | goto disconnect; | |
3670 | ||
3671 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
3672 | if (!pi->sdu) |
3673 | return -ENOMEM; | |
3674 | ||
3675 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3676 | * condition we have to be sure that this will be executed | |
3677 | * only once, i.e., when alloc does not fail */ | |
3678 | skb_pull(skb, 2); | |
18778a63 GP |
3679 | |
3680 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3681 | ||
3682 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3683 | pi->partial_sdu_len = skb->len; | |
3684 | break; | |
3685 | ||
3686 | case L2CAP_SDU_CONTINUE: | |
3687 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3688 | goto disconnect; | |
3689 | ||
3690 | if (!pi->sdu) | |
3691 | goto disconnect; | |
3692 | ||
18778a63 GP |
3693 | pi->partial_sdu_len += skb->len; |
3694 | if (pi->partial_sdu_len > pi->sdu_len) | |
3695 | goto drop; | |
3696 | ||
4178ba46 GP |
3697 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3698 | ||
18778a63 GP |
3699 | break; |
3700 | ||
3701 | case L2CAP_SDU_END: | |
3702 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3703 | goto disconnect; | |
3704 | ||
3705 | if (!pi->sdu) | |
3706 | goto disconnect; | |
3707 | ||
1890d36b | 3708 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 3709 | pi->partial_sdu_len += skb->len; |
18778a63 | 3710 | |
1890d36b GP |
3711 | if (pi->partial_sdu_len > pi->imtu) |
3712 | goto drop; | |
18778a63 | 3713 | |
1890d36b GP |
3714 | if (pi->partial_sdu_len != pi->sdu_len) |
3715 | goto drop; | |
4178ba46 GP |
3716 | |
3717 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 3718 | } |
18778a63 GP |
3719 | |
3720 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
3721 | if (!_skb) { |
3722 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
3723 | return -ENOMEM; | |
3724 | } | |
3725 | ||
18778a63 | 3726 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 3727 | if (err < 0) { |
18778a63 | 3728 | kfree_skb(_skb); |
1890d36b GP |
3729 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
3730 | return err; | |
3731 | } | |
3732 | ||
3733 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
3734 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
3735 | |
3736 | kfree_skb(pi->sdu); | |
3737 | break; | |
3738 | } | |
3739 | ||
3740 | kfree_skb(skb); | |
1890d36b | 3741 | return 0; |
18778a63 GP |
3742 | |
3743 | drop: | |
3744 | kfree_skb(pi->sdu); | |
3745 | pi->sdu = NULL; | |
3746 | ||
3747 | disconnect: | |
9b108fc0 | 3748 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
3749 | kfree_skb(skb); |
3750 | return 0; | |
3751 | } | |
3752 | ||
712132eb GP |
3753 | static int l2cap_try_push_rx_skb(struct sock *sk) |
3754 | { | |
3755 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3756 | struct sk_buff *skb; | |
3757 | u16 control; | |
3758 | int err; | |
3759 | ||
3760 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
3761 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
3762 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3763 | if (err < 0) { | |
3764 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
3765 | return -EBUSY; | |
3766 | } | |
3767 | ||
3768 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3769 | } | |
3770 | ||
3771 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
3772 | goto done; | |
3773 | ||
3774 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3775 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
3776 | l2cap_send_sframe(pi, control); | |
3777 | l2cap_pi(sk)->retry_count = 1; | |
3778 | ||
3779 | del_timer(&pi->retrans_timer); | |
3780 | __mod_monitor_timer(); | |
3781 | ||
3782 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
3783 | ||
3784 | done: | |
3785 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
3786 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
3787 | ||
3788 | BT_DBG("sk %p, Exit local busy", sk); | |
3789 | ||
3790 | return 0; | |
3791 | } | |
3792 | ||
1890d36b GP |
3793 | static void l2cap_busy_work(struct work_struct *work) |
3794 | { | |
3795 | DECLARE_WAITQUEUE(wait, current); | |
3796 | struct l2cap_pinfo *pi = | |
3797 | container_of(work, struct l2cap_pinfo, busy_work); | |
3798 | struct sock *sk = (struct sock *)pi; | |
3799 | int n_tries = 0, timeo = HZ/5, err; | |
3800 | struct sk_buff *skb; | |
1890d36b GP |
3801 | |
3802 | lock_sock(sk); | |
3803 | ||
2b0b05dd | 3804 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3805 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
3806 | set_current_state(TASK_INTERRUPTIBLE); | |
3807 | ||
3808 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3809 | err = -EBUSY; | |
9b108fc0 | 3810 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
712132eb | 3811 | break; |
1890d36b GP |
3812 | } |
3813 | ||
3814 | if (!timeo) | |
3815 | timeo = HZ/5; | |
3816 | ||
3817 | if (signal_pending(current)) { | |
3818 | err = sock_intr_errno(timeo); | |
712132eb | 3819 | break; |
1890d36b GP |
3820 | } |
3821 | ||
3822 | release_sock(sk); | |
3823 | timeo = schedule_timeout(timeo); | |
3824 | lock_sock(sk); | |
3825 | ||
3826 | err = sock_error(sk); | |
3827 | if (err) | |
712132eb | 3828 | break; |
1890d36b | 3829 | |
712132eb | 3830 | if (l2cap_try_push_rx_skb(sk) == 0) |
1890d36b GP |
3831 | break; |
3832 | } | |
3833 | ||
1890d36b | 3834 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3835 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3836 | |
3837 | release_sock(sk); | |
3838 | } | |
3839 | ||
3840 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
3841 | { | |
3842 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3843 | int sctrl, err; | |
3844 | ||
3845 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3846 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3847 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
712132eb GP |
3848 | return l2cap_try_push_rx_skb(sk); |
3849 | ||
3850 | ||
1890d36b GP |
3851 | } |
3852 | ||
3853 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3854 | if (err >= 0) { | |
3855 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3856 | return err; | |
3857 | } | |
3858 | ||
3859 | /* Busy Condition */ | |
0e98958d GP |
3860 | BT_DBG("sk %p, Enter local busy", sk); |
3861 | ||
1890d36b GP |
3862 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
3863 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3864 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3865 | ||
3866 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3867 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
3868 | l2cap_send_sframe(pi, sctrl); | |
3869 | ||
3870 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3871 | ||
7fe9b298 GP |
3872 | del_timer(&pi->ack_timer); |
3873 | ||
1890d36b GP |
3874 | queue_work(_busy_wq, &pi->busy_work); |
3875 | ||
3876 | return err; | |
3877 | } | |
3878 | ||
18778a63 | 3879 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3880 | { |
3881 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3882 | struct sk_buff *_skb; | |
3883 | int err = -EINVAL; | |
3884 | ||
18778a63 GP |
3885 | /* |
3886 | * TODO: We have to notify the userland if some data is lost with the | |
3887 | * Streaming Mode. | |
3888 | */ | |
3889 | ||
c74e560c GP |
3890 | switch (control & L2CAP_CTRL_SAR) { |
3891 | case L2CAP_SDU_UNSEGMENTED: | |
3892 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3893 | kfree_skb(pi->sdu); | |
3894 | break; | |
3895 | } | |
3896 | ||
3897 | err = sock_queue_rcv_skb(sk, skb); | |
3898 | if (!err) | |
3899 | return 0; | |
3900 | ||
3901 | break; | |
3902 | ||
3903 | case L2CAP_SDU_START: | |
3904 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3905 | kfree_skb(pi->sdu); | |
3906 | break; | |
3907 | } | |
3908 | ||
3909 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3910 | skb_pull(skb, 2); | |
3911 | ||
052897ca GP |
3912 | if (pi->sdu_len > pi->imtu) { |
3913 | err = -EMSGSIZE; | |
3914 | break; | |
3915 | } | |
3916 | ||
c74e560c GP |
3917 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3918 | if (!pi->sdu) { | |
3919 | err = -ENOMEM; | |
3920 | break; | |
3921 | } | |
3922 | ||
3923 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3924 | ||
3925 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3926 | pi->partial_sdu_len = skb->len; | |
3927 | err = 0; | |
3928 | break; | |
3929 | ||
3930 | case L2CAP_SDU_CONTINUE: | |
3931 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3932 | break; | |
3933 | ||
3934 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3935 | ||
3936 | pi->partial_sdu_len += skb->len; | |
3937 | if (pi->partial_sdu_len > pi->sdu_len) | |
3938 | kfree_skb(pi->sdu); | |
3939 | else | |
3940 | err = 0; | |
3941 | ||
3942 | break; | |
3943 | ||
3944 | case L2CAP_SDU_END: | |
3945 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3946 | break; | |
3947 | ||
3948 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3949 | ||
3950 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3951 | pi->partial_sdu_len += skb->len; | |
3952 | ||
36f2fd58 GP |
3953 | if (pi->partial_sdu_len > pi->imtu) |
3954 | goto drop; | |
3955 | ||
c74e560c GP |
3956 | if (pi->partial_sdu_len == pi->sdu_len) { |
3957 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3958 | err = sock_queue_rcv_skb(sk, _skb); | |
3959 | if (err < 0) | |
3960 | kfree_skb(_skb); | |
3961 | } | |
c74e560c GP |
3962 | err = 0; |
3963 | ||
36f2fd58 GP |
3964 | drop: |
3965 | kfree_skb(pi->sdu); | |
c74e560c GP |
3966 | break; |
3967 | } | |
3968 | ||
3969 | kfree_skb(skb); | |
3970 | return err; | |
3971 | } | |
3972 | ||
8f17154f GP |
3973 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3974 | { | |
3975 | struct sk_buff *skb; | |
afefdbc4 | 3976 | u16 control; |
8f17154f | 3977 | |
59203a21 | 3978 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3979 | if (bt_cb(skb)->tx_seq != tx_seq) |
3980 | break; | |
3981 | ||
3982 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3983 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3984 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3985 | l2cap_pi(sk)->buffer_seq_srej = |
3986 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3987 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3988 | } |
3989 | } | |
3990 | ||
3991 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3992 | { | |
3993 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3994 | struct srej_list *l, *tmp; | |
3995 | u16 control; | |
3996 | ||
59203a21 | 3997 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3998 | if (l->tx_seq == tx_seq) { |
3999 | list_del(&l->list); | |
4000 | kfree(l); | |
4001 | return; | |
4002 | } | |
4003 | control = L2CAP_SUPER_SELECT_REJECT; | |
4004 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
4005 | l2cap_send_sframe(pi, control); | |
4006 | list_del(&l->list); | |
4007 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
4008 | } | |
4009 | } | |
4010 | ||
4011 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
4012 | { | |
4013 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4014 | struct srej_list *new; | |
4015 | u16 control; | |
4016 | ||
4017 | while (tx_seq != pi->expected_tx_seq) { | |
4018 | control = L2CAP_SUPER_SELECT_REJECT; | |
4019 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
4020 | l2cap_send_sframe(pi, control); | |
4021 | ||
4022 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
4023 | new->tx_seq = pi->expected_tx_seq; |
4024 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
4025 | list_add_tail(&new->list, SREJ_LIST(sk)); |
4026 | } | |
8ff50ec0 | 4027 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
4028 | } |
4029 | ||
1c2acffb GP |
4030 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
4031 | { | |
4032 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4033 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 4034 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 4035 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 4036 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 4037 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
4038 | int err = 0; |
4039 | ||
0e98958d GP |
4040 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
4041 | rx_control); | |
1c2acffb | 4042 | |
9b16dc65 GP |
4043 | if (L2CAP_CTRL_FINAL & rx_control && |
4044 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
4045 | del_timer(&pi->monitor_timer); |
4046 | if (pi->unacked_frames > 0) | |
4047 | __mod_retrans_timer(); | |
4048 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4049 | } | |
4050 | ||
9f121a5a GP |
4051 | pi->expected_ack_seq = req_seq; |
4052 | l2cap_drop_acked_frames(sk); | |
4053 | ||
8f17154f GP |
4054 | if (tx_seq == pi->expected_tx_seq) |
4055 | goto expected; | |
1c2acffb | 4056 | |
9b53350d JPRV |
4057 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
4058 | if (tx_seq_offset < 0) | |
4059 | tx_seq_offset += 64; | |
4060 | ||
4061 | /* invalid tx_seq */ | |
4062 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 4063 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
4064 | goto drop; |
4065 | } | |
4066 | ||
1890d36b GP |
4067 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
4068 | goto drop; | |
4069 | ||
8f17154f GP |
4070 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
4071 | struct srej_list *first; | |
30afb5b2 | 4072 | |
8f17154f GP |
4073 | first = list_first_entry(SREJ_LIST(sk), |
4074 | struct srej_list, list); | |
4075 | if (tx_seq == first->tx_seq) { | |
4076 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
4077 | l2cap_check_srej_gap(sk, tx_seq); | |
4078 | ||
4079 | list_del(&first->list); | |
4080 | kfree(first); | |
4081 | ||
4082 | if (list_empty(SREJ_LIST(sk))) { | |
4083 | pi->buffer_seq = pi->buffer_seq_srej; | |
4084 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 4085 | l2cap_send_ack(pi); |
0e98958d | 4086 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
4087 | } |
4088 | } else { | |
4089 | struct srej_list *l; | |
9b53350d JPRV |
4090 | |
4091 | /* duplicated tx_seq */ | |
4092 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
4093 | goto drop; | |
8f17154f GP |
4094 | |
4095 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
4096 | if (l->tx_seq == tx_seq) { | |
4097 | l2cap_resend_srejframe(sk, tx_seq); | |
4098 | return 0; | |
4099 | } | |
4100 | } | |
4101 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
4102 | } |
4103 | } else { | |
9b53350d JPRV |
4104 | expected_tx_seq_offset = |
4105 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
4106 | if (expected_tx_seq_offset < 0) | |
4107 | expected_tx_seq_offset += 64; | |
4108 | ||
4109 | /* duplicated tx_seq */ | |
4110 | if (tx_seq_offset < expected_tx_seq_offset) | |
4111 | goto drop; | |
4112 | ||
8f17154f | 4113 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 4114 | |
0e98958d GP |
4115 | BT_DBG("sk %p, Enter SREJ", sk); |
4116 | ||
8f17154f GP |
4117 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
4118 | pi->buffer_seq_srej = pi->buffer_seq; | |
4119 | ||
4120 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 4121 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
4122 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
4123 | ||
ef54fd93 GP |
4124 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
4125 | ||
8f17154f | 4126 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
4127 | |
4128 | del_timer(&pi->ack_timer); | |
1c2acffb | 4129 | } |
30afb5b2 GP |
4130 | return 0; |
4131 | ||
8f17154f GP |
4132 | expected: |
4133 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4134 | ||
4135 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
4136 | bt_cb(skb)->tx_seq = tx_seq; |
4137 | bt_cb(skb)->sar = sar; | |
4138 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
4139 | return 0; |
4140 | } | |
4141 | ||
2ece3684 GP |
4142 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
4143 | if (err < 0) | |
4144 | return 0; | |
4145 | ||
4ec10d97 GP |
4146 | if (rx_control & L2CAP_CTRL_FINAL) { |
4147 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
4148 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4149 | else |
4150 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
4151 | } |
4152 | ||
c1b4f43b GP |
4153 | __mod_ack_timer(); |
4154 | ||
803020c6 GP |
4155 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
4156 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
4157 | l2cap_send_ack(pi); |
4158 | ||
8f17154f | 4159 | return 0; |
9b53350d JPRV |
4160 | |
4161 | drop: | |
4162 | kfree_skb(skb); | |
4163 | return 0; | |
1c2acffb GP |
4164 | } |
4165 | ||
e072745f | 4166 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
4167 | { |
4168 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 4169 | |
0e98958d GP |
4170 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
4171 | rx_control); | |
4172 | ||
6e3a5981 GP |
4173 | pi->expected_ack_seq = __get_reqseq(rx_control); |
4174 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 4175 | |
e072745f | 4176 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 4177 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
4178 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
4179 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
4180 | (pi->unacked_frames > 0)) | |
4181 | __mod_retrans_timer(); | |
4182 | ||
4183 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4184 | l2cap_send_srejtail(sk); | |
4185 | } else { | |
4186 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 4187 | } |
1d8f5d16 | 4188 | |
e072745f GP |
4189 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4190 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 4191 | |
e072745f GP |
4192 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
4193 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4194 | else |
4195 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 4196 | |
e072745f | 4197 | } else { |
e072745f GP |
4198 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
4199 | (pi->unacked_frames > 0)) | |
4200 | __mod_retrans_timer(); | |
1c2acffb | 4201 | |
2246b2f1 | 4202 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
894718a6 | 4203 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
e072745f | 4204 | l2cap_send_ack(pi); |
894718a6 | 4205 | else |
e072745f GP |
4206 | l2cap_ertm_send(sk); |
4207 | } | |
4208 | } | |
2246b2f1 | 4209 | |
e072745f GP |
4210 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
4211 | { | |
4212 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4213 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4214 | |
0e98958d GP |
4215 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4216 | ||
e072745f GP |
4217 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4218 | ||
8abb52ee | 4219 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
4220 | l2cap_drop_acked_frames(sk); |
4221 | ||
4222 | if (rx_control & L2CAP_CTRL_FINAL) { | |
4223 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
4224 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4225 | else |
4226 | l2cap_retransmit_frames(sk); | |
e072745f | 4227 | } else { |
dfc909be | 4228 | l2cap_retransmit_frames(sk); |
30afb5b2 | 4229 | |
0301ef04 | 4230 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 4231 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
4232 | } |
4233 | } | |
4234 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
4235 | { | |
4236 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4237 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4238 | |
0e98958d GP |
4239 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4240 | ||
e072745f | 4241 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 4242 | |
e072745f GP |
4243 | if (rx_control & L2CAP_CTRL_POLL) { |
4244 | pi->expected_ack_seq = tx_seq; | |
4245 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
4246 | |
4247 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
4248 | l2cap_retransmit_one_frame(sk, tx_seq); |
4249 | ||
e072745f | 4250 | l2cap_ertm_send(sk); |
dfc909be | 4251 | |
e072745f GP |
4252 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4253 | pi->srej_save_reqseq = tx_seq; | |
4254 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4255 | } |
e072745f GP |
4256 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4257 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
4258 | pi->srej_save_reqseq == tx_seq) | |
4259 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
4260 | else | |
dfc909be | 4261 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 4262 | } else { |
dfc909be | 4263 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
4264 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4265 | pi->srej_save_reqseq = tx_seq; | |
4266 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4267 | } |
e072745f GP |
4268 | } |
4269 | } | |
4270 | ||
4271 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
4272 | { | |
4273 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4274 | u8 tx_seq = __get_reqseq(rx_control); | |
4275 | ||
0e98958d GP |
4276 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4277 | ||
e072745f GP |
4278 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
4279 | pi->expected_ack_seq = tx_seq; | |
4280 | l2cap_drop_acked_frames(sk); | |
4281 | ||
3cb123d1 GP |
4282 | if (rx_control & L2CAP_CTRL_POLL) |
4283 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
4284 | ||
99b0d4b7 GP |
4285 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
4286 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
4287 | if (rx_control & L2CAP_CTRL_POLL) |
4288 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 4289 | return; |
e072745f | 4290 | } |
99b0d4b7 GP |
4291 | |
4292 | if (rx_control & L2CAP_CTRL_POLL) | |
4293 | l2cap_send_srejtail(sk); | |
4294 | else | |
4295 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
4296 | } |
4297 | ||
4298 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
4299 | { | |
4300 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
4301 | ||
9b16dc65 GP |
4302 | if (L2CAP_CTRL_FINAL & rx_control && |
4303 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
4304 | del_timer(&l2cap_pi(sk)->monitor_timer); |
4305 | if (l2cap_pi(sk)->unacked_frames > 0) | |
4306 | __mod_retrans_timer(); | |
4307 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4308 | } | |
4309 | ||
4310 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
4311 | case L2CAP_SUPER_RCV_READY: | |
4312 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
4313 | break; |
4314 | ||
e072745f GP |
4315 | case L2CAP_SUPER_REJECT: |
4316 | l2cap_data_channel_rejframe(sk, rx_control); | |
4317 | break; | |
2246b2f1 | 4318 | |
e072745f GP |
4319 | case L2CAP_SUPER_SELECT_REJECT: |
4320 | l2cap_data_channel_srejframe(sk, rx_control); | |
4321 | break; | |
4322 | ||
4323 | case L2CAP_SUPER_RCV_NOT_READY: | |
4324 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
4325 | break; |
4326 | } | |
4327 | ||
faaebd19 | 4328 | kfree_skb(skb); |
1c2acffb GP |
4329 | return 0; |
4330 | } | |
4331 | ||
218bb9df GP |
4332 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4333 | { | |
4334 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4335 | u16 control; | |
4336 | u8 req_seq; | |
4337 | int len, next_tx_seq_offset, req_seq_offset; | |
4338 | ||
4339 | control = get_unaligned_le16(skb->data); | |
4340 | skb_pull(skb, 2); | |
4341 | len = skb->len; | |
4342 | ||
4343 | /* | |
4344 | * We can just drop the corrupted I-frame here. | |
4345 | * Receiver will miss it and start proper recovery | |
4346 | * procedures and ask retransmission. | |
4347 | */ | |
4348 | if (l2cap_check_fcs(pi, skb)) | |
4349 | goto drop; | |
4350 | ||
4351 | if (__is_sar_start(control) && __is_iframe(control)) | |
4352 | len -= 2; | |
4353 | ||
4354 | if (pi->fcs == L2CAP_FCS_CRC16) | |
4355 | len -= 2; | |
4356 | ||
4357 | if (len > pi->mps) { | |
4358 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4359 | goto drop; | |
4360 | } | |
4361 | ||
4362 | req_seq = __get_reqseq(control); | |
4363 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
4364 | if (req_seq_offset < 0) | |
4365 | req_seq_offset += 64; | |
4366 | ||
4367 | next_tx_seq_offset = | |
4368 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
4369 | if (next_tx_seq_offset < 0) | |
4370 | next_tx_seq_offset += 64; | |
4371 | ||
4372 | /* check for invalid req-seq */ | |
4373 | if (req_seq_offset > next_tx_seq_offset) { | |
4374 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4375 | goto drop; | |
4376 | } | |
4377 | ||
4378 | if (__is_iframe(control)) { | |
4379 | if (len < 0) { | |
4380 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4381 | goto drop; | |
4382 | } | |
4383 | ||
4384 | l2cap_data_channel_iframe(sk, control, skb); | |
4385 | } else { | |
4386 | if (len != 0) { | |
4387 | BT_ERR("%d", len); | |
4388 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4389 | goto drop; | |
4390 | } | |
4391 | ||
4392 | l2cap_data_channel_sframe(sk, control, skb); | |
4393 | } | |
4394 | ||
4395 | return 0; | |
4396 | ||
4397 | drop: | |
4398 | kfree_skb(skb); | |
4399 | return 0; | |
4400 | } | |
4401 | ||
1da177e4 LT |
4402 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4403 | { | |
4404 | struct sock *sk; | |
6840ed07 | 4405 | struct l2cap_pinfo *pi; |
51893f88 | 4406 | u16 control; |
218bb9df GP |
4407 | u8 tx_seq; |
4408 | int len; | |
1da177e4 LT |
4409 | |
4410 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
4411 | if (!sk) { | |
4412 | BT_DBG("unknown cid 0x%4.4x", cid); | |
4413 | goto drop; | |
4414 | } | |
4415 | ||
6840ed07 GP |
4416 | pi = l2cap_pi(sk); |
4417 | ||
1da177e4 LT |
4418 | BT_DBG("sk %p, len %d", sk, skb->len); |
4419 | ||
4420 | if (sk->sk_state != BT_CONNECTED) | |
4421 | goto drop; | |
4422 | ||
6840ed07 | 4423 | switch (pi->mode) { |
1c2acffb GP |
4424 | case L2CAP_MODE_BASIC: |
4425 | /* If socket recv buffers overflows we drop data here | |
4426 | * which is *bad* because L2CAP has to be reliable. | |
4427 | * But we don't have any other choice. L2CAP doesn't | |
4428 | * provide flow control mechanism. */ | |
1da177e4 | 4429 | |
6840ed07 | 4430 | if (pi->imtu < skb->len) |
1c2acffb | 4431 | goto drop; |
1da177e4 | 4432 | |
1c2acffb GP |
4433 | if (!sock_queue_rcv_skb(sk, skb)) |
4434 | goto done; | |
4435 | break; | |
4436 | ||
4437 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
4438 | if (!sock_owned_by_user(sk)) { |
4439 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 4440 | } else { |
218bb9df | 4441 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 4442 | goto drop; |
277ffbe3 | 4443 | } |
1c2acffb | 4444 | |
fcafde2e | 4445 | goto done; |
1c2acffb | 4446 | |
6840ed07 GP |
4447 | case L2CAP_MODE_STREAMING: |
4448 | control = get_unaligned_le16(skb->data); | |
4449 | skb_pull(skb, 2); | |
4450 | len = skb->len; | |
4451 | ||
26000089 GP |
4452 | if (l2cap_check_fcs(pi, skb)) |
4453 | goto drop; | |
4454 | ||
6840ed07 GP |
4455 | if (__is_sar_start(control)) |
4456 | len -= 2; | |
4457 | ||
fcc203c3 GP |
4458 | if (pi->fcs == L2CAP_FCS_CRC16) |
4459 | len -= 2; | |
4460 | ||
51893f88 | 4461 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
4462 | goto drop; |
4463 | ||
4464 | tx_seq = __get_txseq(control); | |
4465 | ||
4466 | if (pi->expected_tx_seq == tx_seq) | |
4467 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4468 | else | |
7dffe421 | 4469 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 4470 | |
18778a63 | 4471 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
4472 | |
4473 | goto done; | |
4474 | ||
1c2acffb | 4475 | default: |
e8235c6b | 4476 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
4477 | break; |
4478 | } | |
1da177e4 LT |
4479 | |
4480 | drop: | |
4481 | kfree_skb(skb); | |
4482 | ||
4483 | done: | |
0139418c MH |
4484 | if (sk) |
4485 | bh_unlock_sock(sk); | |
4486 | ||
1da177e4 LT |
4487 | return 0; |
4488 | } | |
4489 | ||
8e036fc3 | 4490 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
4491 | { |
4492 | struct sock *sk; | |
4493 | ||
4494 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
4495 | if (!sk) | |
4496 | goto drop; | |
4497 | ||
e0f0cb56 GP |
4498 | bh_lock_sock(sk); |
4499 | ||
1da177e4 LT |
4500 | BT_DBG("sk %p, len %d", sk, skb->len); |
4501 | ||
4502 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
4503 | goto drop; | |
4504 | ||
4505 | if (l2cap_pi(sk)->imtu < skb->len) | |
4506 | goto drop; | |
4507 | ||
4508 | if (!sock_queue_rcv_skb(sk, skb)) | |
4509 | goto done; | |
4510 | ||
4511 | drop: | |
4512 | kfree_skb(skb); | |
4513 | ||
4514 | done: | |
af05b30b GP |
4515 | if (sk) |
4516 | bh_unlock_sock(sk); | |
1da177e4 LT |
4517 | return 0; |
4518 | } | |
4519 | ||
4520 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
4521 | { | |
4522 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4523 | u16 cid, len; |
4524 | __le16 psm; | |
1da177e4 LT |
4525 | |
4526 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4527 | cid = __le16_to_cpu(lh->cid); | |
4528 | len = __le16_to_cpu(lh->len); | |
4529 | ||
1c2acffb GP |
4530 | if (len != skb->len) { |
4531 | kfree_skb(skb); | |
4532 | return; | |
4533 | } | |
4534 | ||
1da177e4 LT |
4535 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4536 | ||
4537 | switch (cid) { | |
8db4dc46 | 4538 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4539 | l2cap_sig_channel(conn, skb); |
4540 | break; | |
4541 | ||
8db4dc46 | 4542 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4543 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4544 | skb_pull(skb, 2); |
4545 | l2cap_conless_channel(conn, psm, skb); | |
4546 | break; | |
4547 | ||
4548 | default: | |
4549 | l2cap_data_channel(conn, cid, skb); | |
4550 | break; | |
4551 | } | |
4552 | } | |
4553 | ||
4554 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4555 | ||
4556 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4557 | { | |
4558 | int exact = 0, lm1 = 0, lm2 = 0; | |
4559 | register struct sock *sk; | |
4560 | struct hlist_node *node; | |
4561 | ||
4562 | if (type != ACL_LINK) | |
963cf687 | 4563 | return -EINVAL; |
1da177e4 LT |
4564 | |
4565 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4566 | ||
4567 | /* Find listening sockets and check their link_mode */ | |
4568 | read_lock(&l2cap_sk_list.lock); | |
4569 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4570 | if (sk->sk_state != BT_LISTEN) | |
4571 | continue; | |
4572 | ||
4573 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
4574 | lm1 |= HCI_LM_ACCEPT; |
4575 | if (l2cap_pi(sk)->role_switch) | |
4576 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 4577 | exact++; |
2af6b9d5 MH |
4578 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4579 | lm2 |= HCI_LM_ACCEPT; | |
4580 | if (l2cap_pi(sk)->role_switch) | |
4581 | lm2 |= HCI_LM_MASTER; | |
4582 | } | |
1da177e4 LT |
4583 | } |
4584 | read_unlock(&l2cap_sk_list.lock); | |
4585 | ||
4586 | return exact ? lm1 : lm2; | |
4587 | } | |
4588 | ||
4589 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4590 | { | |
0139418c MH |
4591 | struct l2cap_conn *conn; |
4592 | ||
1da177e4 LT |
4593 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4594 | ||
4595 | if (hcon->type != ACL_LINK) | |
963cf687 | 4596 | return -EINVAL; |
1da177e4 LT |
4597 | |
4598 | if (!status) { | |
1da177e4 LT |
4599 | conn = l2cap_conn_add(hcon, status); |
4600 | if (conn) | |
4601 | l2cap_conn_ready(conn); | |
0139418c | 4602 | } else |
1da177e4 LT |
4603 | l2cap_conn_del(hcon, bt_err(status)); |
4604 | ||
4605 | return 0; | |
4606 | } | |
4607 | ||
2950f21a MH |
4608 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4609 | { | |
4610 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4611 | ||
4612 | BT_DBG("hcon %p", hcon); | |
4613 | ||
4614 | if (hcon->type != ACL_LINK || !conn) | |
4615 | return 0x13; | |
4616 | ||
4617 | return conn->disc_reason; | |
4618 | } | |
4619 | ||
4620 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4621 | { |
4622 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4623 | ||
4624 | if (hcon->type != ACL_LINK) | |
963cf687 | 4625 | return -EINVAL; |
1da177e4 LT |
4626 | |
4627 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4628 | |
1da177e4 LT |
4629 | return 0; |
4630 | } | |
4631 | ||
f62e4323 MH |
4632 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4633 | { | |
bd3c9e25 | 4634 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4635 | return; |
4636 | ||
f62e4323 MH |
4637 | if (encrypt == 0x00) { |
4638 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4639 | l2cap_sock_clear_timer(sk); | |
4640 | l2cap_sock_set_timer(sk, HZ * 5); | |
4641 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4642 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4643 | } else { | |
4644 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4645 | l2cap_sock_clear_timer(sk); | |
4646 | } | |
4647 | } | |
4648 | ||
8c1b2355 | 4649 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4650 | { |
4651 | struct l2cap_chan_list *l; | |
0139418c | 4652 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4653 | struct sock *sk; |
1da177e4 | 4654 | |
0139418c | 4655 | if (!conn) |
1da177e4 | 4656 | return 0; |
0139418c | 4657 | |
1da177e4 LT |
4658 | l = &conn->chan_list; |
4659 | ||
4660 | BT_DBG("conn %p", conn); | |
4661 | ||
4662 | read_lock(&l->lock); | |
4663 | ||
4664 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4665 | bh_lock_sock(sk); | |
4666 | ||
6a8d3010 MH |
4667 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4668 | bh_unlock_sock(sk); | |
4669 | continue; | |
4670 | } | |
4671 | ||
f62e4323 | 4672 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4673 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4674 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4675 | bh_unlock_sock(sk); |
4676 | continue; | |
4677 | } | |
4678 | ||
b1235d79 MH |
4679 | if (sk->sk_state == BT_CONNECT) { |
4680 | if (!status) { | |
4681 | struct l2cap_conn_req req; | |
4682 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4683 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4684 | |
b1235d79 | 4685 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 4686 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 4687 | |
b1235d79 MH |
4688 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4689 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4690 | } else { | |
4691 | l2cap_sock_clear_timer(sk); | |
4692 | l2cap_sock_set_timer(sk, HZ / 10); | |
4693 | } | |
4694 | } else if (sk->sk_state == BT_CONNECT2) { | |
4695 | struct l2cap_conn_rsp rsp; | |
4696 | __u16 result; | |
1da177e4 | 4697 | |
b1235d79 MH |
4698 | if (!status) { |
4699 | sk->sk_state = BT_CONFIG; | |
4700 | result = L2CAP_CR_SUCCESS; | |
4701 | } else { | |
4702 | sk->sk_state = BT_DISCONN; | |
4703 | l2cap_sock_set_timer(sk, HZ / 10); | |
4704 | result = L2CAP_CR_SEC_BLOCK; | |
4705 | } | |
4706 | ||
4707 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4708 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4709 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4710 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4711 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4712 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4713 | } | |
1da177e4 LT |
4714 | |
4715 | bh_unlock_sock(sk); | |
4716 | } | |
4717 | ||
4718 | read_unlock(&l->lock); | |
b1235d79 | 4719 | |
1da177e4 LT |
4720 | return 0; |
4721 | } | |
4722 | ||
4723 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4724 | { | |
4725 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4726 | ||
4727 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4728 | goto drop; | |
4729 | ||
4730 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4731 | ||
e702112f | 4732 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4733 | struct l2cap_hdr *hdr; |
89794813 AE |
4734 | struct sock *sk; |
4735 | u16 cid; | |
1da177e4 LT |
4736 | int len; |
4737 | ||
4738 | if (conn->rx_len) { | |
4739 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4740 | kfree_skb(conn->rx_skb); | |
4741 | conn->rx_skb = NULL; | |
4742 | conn->rx_len = 0; | |
4743 | l2cap_conn_unreliable(conn, ECOMM); | |
4744 | } | |
4745 | ||
aae7fe22 AE |
4746 | /* Start fragment always begin with Basic L2CAP header */ |
4747 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4748 | BT_ERR("Frame is too short (len %d)", skb->len); |
4749 | l2cap_conn_unreliable(conn, ECOMM); | |
4750 | goto drop; | |
4751 | } | |
4752 | ||
4753 | hdr = (struct l2cap_hdr *) skb->data; | |
4754 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4755 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4756 | |
4757 | if (len == skb->len) { | |
4758 | /* Complete frame received */ | |
4759 | l2cap_recv_frame(conn, skb); | |
4760 | return 0; | |
4761 | } | |
4762 | ||
4763 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4764 | ||
4765 | if (skb->len > len) { | |
4766 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4767 | skb->len, len); | |
4768 | l2cap_conn_unreliable(conn, ECOMM); | |
4769 | goto drop; | |
4770 | } | |
4771 | ||
89794813 AE |
4772 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
4773 | ||
4774 | if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { | |
4775 | BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)", | |
4776 | len, l2cap_pi(sk)->imtu); | |
4777 | bh_unlock_sock(sk); | |
4778 | l2cap_conn_unreliable(conn, ECOMM); | |
4779 | goto drop; | |
4780 | } | |
4781 | ||
4782 | if (sk) | |
4783 | bh_unlock_sock(sk); | |
4784 | ||
1da177e4 | 4785 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4786 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4787 | if (!conn->rx_skb) | |
1da177e4 LT |
4788 | goto drop; |
4789 | ||
d626f62b | 4790 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4791 | skb->len); |
1da177e4 LT |
4792 | conn->rx_len = len - skb->len; |
4793 | } else { | |
4794 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4795 | ||
4796 | if (!conn->rx_len) { | |
4797 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4798 | l2cap_conn_unreliable(conn, ECOMM); | |
4799 | goto drop; | |
4800 | } | |
4801 | ||
4802 | if (skb->len > conn->rx_len) { | |
4803 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4804 | skb->len, conn->rx_len); | |
4805 | kfree_skb(conn->rx_skb); | |
4806 | conn->rx_skb = NULL; | |
4807 | conn->rx_len = 0; | |
4808 | l2cap_conn_unreliable(conn, ECOMM); | |
4809 | goto drop; | |
4810 | } | |
4811 | ||
d626f62b | 4812 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4813 | skb->len); |
1da177e4 LT |
4814 | conn->rx_len -= skb->len; |
4815 | ||
4816 | if (!conn->rx_len) { | |
4817 | /* Complete frame received */ | |
4818 | l2cap_recv_frame(conn, conn->rx_skb); | |
4819 | conn->rx_skb = NULL; | |
4820 | } | |
4821 | } | |
4822 | ||
4823 | drop: | |
4824 | kfree_skb(skb); | |
4825 | return 0; | |
4826 | } | |
4827 | ||
aef7d97c | 4828 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4829 | { |
4830 | struct sock *sk; | |
4831 | struct hlist_node *node; | |
1da177e4 LT |
4832 | |
4833 | read_lock_bh(&l2cap_sk_list.lock); | |
4834 | ||
be9d1227 MH |
4835 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4836 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4837 | |
aef7d97c MH |
4838 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4839 | batostr(&bt_sk(sk)->src), | |
4840 | batostr(&bt_sk(sk)->dst), | |
4841 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4842 | pi->scid, pi->dcid, | |
4843 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4844 | } |
1da177e4 | 4845 | |
1da177e4 | 4846 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4847 | |
aef7d97c | 4848 | return 0; |
1da177e4 LT |
4849 | } |
4850 | ||
aef7d97c MH |
4851 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4852 | { | |
4853 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4854 | } | |
4855 | ||
4856 | static const struct file_operations l2cap_debugfs_fops = { | |
4857 | .open = l2cap_debugfs_open, | |
4858 | .read = seq_read, | |
4859 | .llseek = seq_lseek, | |
4860 | .release = single_release, | |
4861 | }; | |
4862 | ||
4863 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4864 | |
90ddc4f0 | 4865 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4866 | .family = PF_BLUETOOTH, |
4867 | .owner = THIS_MODULE, | |
4868 | .release = l2cap_sock_release, | |
4869 | .bind = l2cap_sock_bind, | |
4870 | .connect = l2cap_sock_connect, | |
4871 | .listen = l2cap_sock_listen, | |
4872 | .accept = l2cap_sock_accept, | |
4873 | .getname = l2cap_sock_getname, | |
4874 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4875 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4876 | .poll = bt_sock_poll, |
3241ad82 | 4877 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4878 | .mmap = sock_no_mmap, |
4879 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4880 | .shutdown = l2cap_sock_shutdown, |
4881 | .setsockopt = l2cap_sock_setsockopt, | |
4882 | .getsockopt = l2cap_sock_getsockopt | |
4883 | }; | |
4884 | ||
ec1b4cf7 | 4885 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4886 | .family = PF_BLUETOOTH, |
4887 | .owner = THIS_MODULE, | |
4888 | .create = l2cap_sock_create, | |
4889 | }; | |
4890 | ||
4891 | static struct hci_proto l2cap_hci_proto = { | |
4892 | .name = "L2CAP", | |
4893 | .id = HCI_PROTO_L2CAP, | |
4894 | .connect_ind = l2cap_connect_ind, | |
4895 | .connect_cfm = l2cap_connect_cfm, | |
4896 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4897 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4898 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4899 | .recv_acldata = l2cap_recv_acldata |
4900 | }; | |
4901 | ||
4902 | static int __init l2cap_init(void) | |
4903 | { | |
4904 | int err; | |
be9d1227 | 4905 | |
1da177e4 LT |
4906 | err = proto_register(&l2cap_proto, 0); |
4907 | if (err < 0) | |
4908 | return err; | |
4909 | ||
1890d36b | 4910 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f AL |
4911 | if (!_busy_wq) { |
4912 | proto_unregister(&l2cap_proto); | |
4913 | return -ENOMEM; | |
4914 | } | |
1890d36b | 4915 | |
1da177e4 LT |
4916 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); |
4917 | if (err < 0) { | |
4918 | BT_ERR("L2CAP socket registration failed"); | |
4919 | goto error; | |
4920 | } | |
4921 | ||
4922 | err = hci_register_proto(&l2cap_hci_proto); | |
4923 | if (err < 0) { | |
4924 | BT_ERR("L2CAP protocol registration failed"); | |
4925 | bt_sock_unregister(BTPROTO_L2CAP); | |
4926 | goto error; | |
4927 | } | |
4928 | ||
aef7d97c MH |
4929 | if (bt_debugfs) { |
4930 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4931 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4932 | if (!l2cap_debugfs) | |
4933 | BT_ERR("Failed to create L2CAP debug file"); | |
4934 | } | |
1da177e4 LT |
4935 | |
4936 | BT_INFO("L2CAP ver %s", VERSION); | |
4937 | BT_INFO("L2CAP socket layer initialized"); | |
4938 | ||
4939 | return 0; | |
4940 | ||
4941 | error: | |
b78d7b4f | 4942 | destroy_workqueue(_busy_wq); |
1da177e4 LT |
4943 | proto_unregister(&l2cap_proto); |
4944 | return err; | |
4945 | } | |
4946 | ||
4947 | static void __exit l2cap_exit(void) | |
4948 | { | |
aef7d97c | 4949 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4950 | |
1890d36b GP |
4951 | flush_workqueue(_busy_wq); |
4952 | destroy_workqueue(_busy_wq); | |
4953 | ||
1da177e4 LT |
4954 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) |
4955 | BT_ERR("L2CAP socket unregistration failed"); | |
4956 | ||
4957 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4958 | BT_ERR("L2CAP protocol unregistration failed"); | |
4959 | ||
4960 | proto_unregister(&l2cap_proto); | |
4961 | } | |
4962 | ||
4963 | void l2cap_load(void) | |
4964 | { | |
4965 | /* Dummy function to trigger automatic L2CAP module loading by | |
4966 | * other modules that use L2CAP sockets but don't use any other | |
4967 | * symbols from it. */ | |
1da177e4 LT |
4968 | } |
4969 | EXPORT_SYMBOL(l2cap_load); | |
4970 | ||
4971 | module_init(l2cap_init); | |
4972 | module_exit(l2cap_exit); | |
4973 | ||
d1c4a17d GP |
4974 | module_param(disable_ertm, bool, 0644); |
4975 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); | |
44dd46de | 4976 | |
63fbd24e | 4977 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4978 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4979 | MODULE_VERSION(VERSION); | |
4980 | MODULE_LICENSE("GPL"); | |
4981 | MODULE_ALIAS("bt-proto-0"); |