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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
4 | ||
5 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License version 2 as | |
9 | published by the Free Software Foundation; | |
10 | ||
11 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
12 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
13 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
14 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
15 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
16 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | ||
8e87d142 YH |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ | |
24 | ||
25 | /* Bluetooth L2CAP core and sockets. */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | ||
29 | #include <linux/types.h> | |
4fc268d2 | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/errno.h> |
32 | #include <linux/kernel.h> | |
1da177e4 LT |
33 | #include <linux/sched.h> |
34 | #include <linux/slab.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/skbuff.h> | |
1da177e4 | 41 | #include <linux/list.h> |
be9d1227 | 42 | #include <linux/device.h> |
aef7d97c MH |
43 | #include <linux/debugfs.h> |
44 | #include <linux/seq_file.h> | |
af05b30b | 45 | #include <linux/uaccess.h> |
fcc203c3 | 46 | #include <linux/crc16.h> |
1da177e4 LT |
47 | #include <net/sock.h> |
48 | ||
49 | #include <asm/system.h> | |
1da177e4 LT |
50 | #include <asm/unaligned.h> |
51 | ||
52 | #include <net/bluetooth/bluetooth.h> | |
53 | #include <net/bluetooth/hci_core.h> | |
54 | #include <net/bluetooth/l2cap.h> | |
55 | ||
44dd46de MH |
56 | #define VERSION "2.14" |
57 | ||
58 | static int enable_ertm = 0; | |
f0709e03 | 59 | |
47ec1dcd | 60 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 61 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 62 | |
90ddc4f0 | 63 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 | 64 | |
1890d36b GP |
65 | static struct workqueue_struct *_busy_wq; |
66 | ||
1da177e4 | 67 | static struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 68 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
69 | }; |
70 | ||
1890d36b GP |
71 | static void l2cap_busy_work(struct work_struct *work); |
72 | ||
1da177e4 LT |
73 | static void __l2cap_sock_close(struct sock *sk, int reason); |
74 | static void l2cap_sock_close(struct sock *sk); | |
75 | static void l2cap_sock_kill(struct sock *sk); | |
76 | ||
77 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
78 | u8 code, u8 ident, u16 dlen, void *data); | |
79 | ||
80 | /* ---- L2CAP timers ---- */ | |
81 | static void l2cap_sock_timeout(unsigned long arg) | |
82 | { | |
83 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 84 | int reason; |
1da177e4 LT |
85 | |
86 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
87 | ||
88 | bh_lock_sock(sk); | |
b1235d79 | 89 | |
f62e4323 MH |
90 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
91 | reason = ECONNREFUSED; | |
92 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 93 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
94 | reason = ECONNREFUSED; |
95 | else | |
96 | reason = ETIMEDOUT; | |
97 | ||
98 | __l2cap_sock_close(sk, reason); | |
99 | ||
1da177e4 LT |
100 | bh_unlock_sock(sk); |
101 | ||
102 | l2cap_sock_kill(sk); | |
103 | sock_put(sk); | |
104 | } | |
105 | ||
106 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
107 | { | |
108 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
109 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
110 | } | |
111 | ||
112 | static void l2cap_sock_clear_timer(struct sock *sk) | |
113 | { | |
114 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
115 | sk_stop_timer(sk, &sk->sk_timer); | |
116 | } | |
117 | ||
0139418c MH |
118 | /* ---- L2CAP channels ---- */ |
119 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
120 | { | |
121 | struct sock *s; | |
122 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
123 | if (l2cap_pi(s)->dcid == cid) | |
124 | break; | |
125 | } | |
126 | return s; | |
127 | } | |
128 | ||
129 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
130 | { | |
131 | struct sock *s; | |
132 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
133 | if (l2cap_pi(s)->scid == cid) | |
134 | break; | |
135 | } | |
136 | return s; | |
137 | } | |
138 | ||
139 | /* Find channel with given SCID. | |
140 | * Returns locked socket */ | |
141 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
142 | { | |
143 | struct sock *s; | |
144 | read_lock(&l->lock); | |
145 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
146 | if (s) |
147 | bh_lock_sock(s); | |
0139418c MH |
148 | read_unlock(&l->lock); |
149 | return s; | |
150 | } | |
151 | ||
152 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
153 | { | |
154 | struct sock *s; | |
155 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
156 | if (l2cap_pi(s)->ident == ident) | |
157 | break; | |
158 | } | |
159 | return s; | |
160 | } | |
161 | ||
162 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
163 | { | |
164 | struct sock *s; | |
165 | read_lock(&l->lock); | |
166 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
167 | if (s) |
168 | bh_lock_sock(s); | |
0139418c MH |
169 | read_unlock(&l->lock); |
170 | return s; | |
171 | } | |
172 | ||
173 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
174 | { | |
8db4dc46 | 175 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 176 | |
8db4dc46 | 177 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 178 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
179 | return cid; |
180 | } | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
186 | { | |
187 | sock_hold(sk); | |
188 | ||
189 | if (l->head) | |
190 | l2cap_pi(l->head)->prev_c = sk; | |
191 | ||
192 | l2cap_pi(sk)->next_c = l->head; | |
193 | l2cap_pi(sk)->prev_c = NULL; | |
194 | l->head = sk; | |
195 | } | |
196 | ||
197 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
198 | { | |
199 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
200 | ||
fd1278d7 | 201 | write_lock_bh(&l->lock); |
0139418c MH |
202 | if (sk == l->head) |
203 | l->head = next; | |
204 | ||
205 | if (next) | |
206 | l2cap_pi(next)->prev_c = prev; | |
207 | if (prev) | |
208 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 209 | write_unlock_bh(&l->lock); |
0139418c MH |
210 | |
211 | __sock_put(sk); | |
212 | } | |
213 | ||
214 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
215 | { | |
216 | struct l2cap_chan_list *l = &conn->chan_list; | |
217 | ||
af05b30b GP |
218 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
219 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 220 | |
2950f21a MH |
221 | conn->disc_reason = 0x13; |
222 | ||
0139418c MH |
223 | l2cap_pi(sk)->conn = conn; |
224 | ||
bd3c9e25 | 225 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
226 | /* Alloc CID for connection-oriented socket */ |
227 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
228 | } else if (sk->sk_type == SOCK_DGRAM) { | |
229 | /* Connectionless socket */ | |
8db4dc46 GP |
230 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
231 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
232 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
233 | } else { | |
234 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
235 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
236 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
237 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
238 | } | |
239 | ||
240 | __l2cap_chan_link(l, sk); | |
241 | ||
242 | if (parent) | |
243 | bt_accept_enqueue(parent, sk); | |
244 | } | |
245 | ||
8e87d142 | 246 | /* Delete channel. |
0139418c MH |
247 | * Must be called on the locked socket. */ |
248 | static void l2cap_chan_del(struct sock *sk, int err) | |
249 | { | |
250 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
251 | struct sock *parent = bt_sk(sk)->parent; | |
252 | ||
253 | l2cap_sock_clear_timer(sk); | |
254 | ||
255 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
256 | ||
8e87d142 | 257 | if (conn) { |
0139418c MH |
258 | /* Unlink from channel list */ |
259 | l2cap_chan_unlink(&conn->chan_list, sk); | |
260 | l2cap_pi(sk)->conn = NULL; | |
261 | hci_conn_put(conn->hcon); | |
262 | } | |
263 | ||
b1235d79 | 264 | sk->sk_state = BT_CLOSED; |
0139418c MH |
265 | sock_set_flag(sk, SOCK_ZAPPED); |
266 | ||
267 | if (err) | |
268 | sk->sk_err = err; | |
269 | ||
270 | if (parent) { | |
271 | bt_accept_unlink(sk); | |
272 | parent->sk_data_ready(parent, 0); | |
273 | } else | |
274 | sk->sk_state_change(sk); | |
c13ffa62 GP |
275 | |
276 | skb_queue_purge(TX_QUEUE(sk)); | |
277 | ||
278 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
279 | struct srej_list *l, *tmp; | |
280 | ||
281 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
282 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
283 | del_timer(&l2cap_pi(sk)->ack_timer); | |
284 | ||
285 | skb_queue_purge(SREJ_QUEUE(sk)); | |
286 | skb_queue_purge(BUSY_QUEUE(sk)); | |
287 | ||
288 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { | |
289 | list_del(&l->list); | |
290 | kfree(l); | |
291 | } | |
292 | } | |
0139418c MH |
293 | } |
294 | ||
79d554a6 | 295 | /* Service level security */ |
2af6b9d5 | 296 | static inline int l2cap_check_security(struct sock *sk) |
79d554a6 MH |
297 | { |
298 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
0684e5f9 MH |
299 | __u8 auth_type; |
300 | ||
00ae4af9 MH |
301 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
302 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
303 | auth_type = HCI_AT_NO_BONDING_MITM; | |
304 | else | |
af05b30b | 305 | auth_type = HCI_AT_NO_BONDING; |
00ae4af9 MH |
306 | |
307 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
308 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
309 | } else { | |
310 | switch (l2cap_pi(sk)->sec_level) { | |
311 | case BT_SECURITY_HIGH: | |
312 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
313 | break; | |
314 | case BT_SECURITY_MEDIUM: | |
315 | auth_type = HCI_AT_GENERAL_BONDING; | |
316 | break; | |
317 | default: | |
318 | auth_type = HCI_AT_NO_BONDING; | |
319 | break; | |
320 | } | |
0684e5f9 | 321 | } |
79d554a6 | 322 | |
0684e5f9 MH |
323 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
324 | auth_type); | |
79d554a6 MH |
325 | } |
326 | ||
4e8402a3 MH |
327 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
328 | { | |
329 | u8 id; | |
330 | ||
331 | /* Get next available identificator. | |
332 | * 1 - 128 are used by kernel. | |
333 | * 129 - 199 are reserved. | |
334 | * 200 - 254 are used by utilities like l2ping, etc. | |
335 | */ | |
336 | ||
337 | spin_lock_bh(&conn->lock); | |
338 | ||
339 | if (++conn->tx_ident > 128) | |
340 | conn->tx_ident = 1; | |
341 | ||
342 | id = conn->tx_ident; | |
343 | ||
344 | spin_unlock_bh(&conn->lock); | |
345 | ||
346 | return id; | |
347 | } | |
348 | ||
9a9c6a34 | 349 | static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
350 | { |
351 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
352 | ||
353 | BT_DBG("code 0x%2.2x", code); | |
354 | ||
355 | if (!skb) | |
9a9c6a34 | 356 | return; |
4e8402a3 | 357 | |
9a9c6a34 | 358 | hci_send_acl(conn->hcon, skb, 0); |
4e8402a3 MH |
359 | } |
360 | ||
9a9c6a34 | 361 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
362 | { |
363 | struct sk_buff *skb; | |
364 | struct l2cap_hdr *lh; | |
365 | struct l2cap_conn *conn = pi->conn; | |
c13ffa62 | 366 | struct sock *sk = (struct sock *)pi; |
fcc203c3 GP |
367 | int count, hlen = L2CAP_HDR_SIZE + 2; |
368 | ||
c13ffa62 GP |
369 | if (sk->sk_state != BT_CONNECTED) |
370 | return; | |
371 | ||
fcc203c3 GP |
372 | if (pi->fcs == L2CAP_FCS_CRC16) |
373 | hlen += 2; | |
1c2acffb GP |
374 | |
375 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
376 | ||
fcc203c3 | 377 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
378 | control |= L2CAP_CTRL_FRAME_TYPE; |
379 | ||
9e917af1 GP |
380 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
381 | control |= L2CAP_CTRL_FINAL; | |
382 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
383 | } | |
384 | ||
f0946ccf GP |
385 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
386 | control |= L2CAP_CTRL_POLL; | |
387 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
388 | } | |
389 | ||
1c2acffb GP |
390 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
391 | if (!skb) | |
9a9c6a34 | 392 | return; |
1c2acffb GP |
393 | |
394 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 395 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
396 | lh->cid = cpu_to_le16(pi->dcid); |
397 | put_unaligned_le16(control, skb_put(skb, 2)); | |
398 | ||
fcc203c3 GP |
399 | if (pi->fcs == L2CAP_FCS_CRC16) { |
400 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
401 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
402 | } | |
403 | ||
9a9c6a34 | 404 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
405 | } |
406 | ||
9a9c6a34 | 407 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 408 | { |
1890d36b | 409 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 410 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
411 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
412 | } else | |
7e743090 GP |
413 | control |= L2CAP_SUPER_RCV_READY; |
414 | ||
2ab25cdd GP |
415 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
416 | ||
9a9c6a34 | 417 | l2cap_send_sframe(pi, control); |
7e743090 GP |
418 | } |
419 | ||
e501d055 AE |
420 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
421 | { | |
422 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
423 | } | |
424 | ||
79d554a6 MH |
425 | static void l2cap_do_start(struct sock *sk) |
426 | { | |
427 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
428 | ||
429 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
430 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
431 | return; | |
432 | ||
e501d055 | 433 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
434 | struct l2cap_conn_req req; |
435 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
436 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 437 | |
b1235d79 | 438 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 439 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 440 | |
b1235d79 | 441 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 442 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 443 | } |
79d554a6 MH |
444 | } else { |
445 | struct l2cap_info_req req; | |
446 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
447 | ||
448 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
449 | conn->info_ident = l2cap_get_ident(conn); | |
450 | ||
451 | mod_timer(&conn->info_timer, jiffies + | |
452 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
453 | ||
454 | l2cap_send_cmd(conn, conn->info_ident, | |
455 | L2CAP_INFO_REQ, sizeof(req), &req); | |
456 | } | |
457 | } | |
458 | ||
9b108fc0 | 459 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
460 | { |
461 | struct l2cap_disconn_req req; | |
462 | ||
c13ffa62 GP |
463 | if (!conn) |
464 | return; | |
465 | ||
466 | skb_queue_purge(TX_QUEUE(sk)); | |
467 | ||
468 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
469 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
470 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
471 | del_timer(&l2cap_pi(sk)->ack_timer); | |
472 | } | |
473 | ||
22121fc9 GP |
474 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
475 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
476 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
477 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
478 | |
479 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 480 | sk->sk_err = err; |
22121fc9 GP |
481 | } |
482 | ||
1da177e4 | 483 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
484 | static void l2cap_conn_start(struct l2cap_conn *conn) |
485 | { | |
486 | struct l2cap_chan_list *l = &conn->chan_list; | |
487 | struct sock *sk; | |
488 | ||
489 | BT_DBG("conn %p", conn); | |
490 | ||
491 | read_lock(&l->lock); | |
492 | ||
493 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
494 | bh_lock_sock(sk); | |
495 | ||
bd3c9e25 GP |
496 | if (sk->sk_type != SOCK_SEQPACKET && |
497 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
498 | bh_unlock_sock(sk); |
499 | continue; | |
500 | } | |
501 | ||
502 | if (sk->sk_state == BT_CONNECT) { | |
e501d055 AE |
503 | if (l2cap_check_security(sk) && |
504 | __l2cap_no_conn_pending(sk)) { | |
b1235d79 MH |
505 | struct l2cap_conn_req req; |
506 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
507 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 508 | |
b1235d79 | 509 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 510 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 511 | |
b1235d79 | 512 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 513 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 514 | } |
79d554a6 MH |
515 | } else if (sk->sk_state == BT_CONNECT2) { |
516 | struct l2cap_conn_rsp rsp; | |
517 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
518 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
519 | ||
2af6b9d5 | 520 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
521 | if (bt_sk(sk)->defer_setup) { |
522 | struct sock *parent = bt_sk(sk)->parent; | |
523 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
524 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
525 | parent->sk_data_ready(parent, 0); | |
526 | ||
527 | } else { | |
528 | sk->sk_state = BT_CONFIG; | |
529 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
530 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
531 | } | |
79d554a6 MH |
532 | } else { |
533 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
534 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
535 | } | |
536 | ||
537 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
538 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
539 | } |
540 | ||
541 | bh_unlock_sock(sk); | |
542 | } | |
543 | ||
544 | read_unlock(&l->lock); | |
545 | } | |
546 | ||
547 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
548 | { | |
79d554a6 MH |
549 | struct l2cap_chan_list *l = &conn->chan_list; |
550 | struct sock *sk; | |
4e8402a3 | 551 | |
79d554a6 | 552 | BT_DBG("conn %p", conn); |
4e8402a3 | 553 | |
79d554a6 | 554 | read_lock(&l->lock); |
4e8402a3 | 555 | |
79d554a6 MH |
556 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
557 | bh_lock_sock(sk); | |
4e8402a3 | 558 | |
bd3c9e25 GP |
559 | if (sk->sk_type != SOCK_SEQPACKET && |
560 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
561 | l2cap_sock_clear_timer(sk); |
562 | sk->sk_state = BT_CONNECTED; | |
563 | sk->sk_state_change(sk); | |
564 | } else if (sk->sk_state == BT_CONNECT) | |
565 | l2cap_do_start(sk); | |
4e8402a3 | 566 | |
79d554a6 | 567 | bh_unlock_sock(sk); |
4e8402a3 | 568 | } |
79d554a6 MH |
569 | |
570 | read_unlock(&l->lock); | |
4e8402a3 MH |
571 | } |
572 | ||
573 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
574 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
575 | { | |
576 | struct l2cap_chan_list *l = &conn->chan_list; | |
577 | struct sock *sk; | |
578 | ||
579 | BT_DBG("conn %p", conn); | |
580 | ||
581 | read_lock(&l->lock); | |
582 | ||
583 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 584 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
585 | sk->sk_err = err; |
586 | } | |
587 | ||
588 | read_unlock(&l->lock); | |
589 | } | |
590 | ||
591 | static void l2cap_info_timeout(unsigned long arg) | |
592 | { | |
593 | struct l2cap_conn *conn = (void *) arg; | |
594 | ||
984947dc | 595 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 596 | conn->info_ident = 0; |
984947dc | 597 | |
4e8402a3 MH |
598 | l2cap_conn_start(conn); |
599 | } | |
600 | ||
1da177e4 LT |
601 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
602 | { | |
0139418c | 603 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 604 | |
0139418c | 605 | if (conn || status) |
1da177e4 LT |
606 | return conn; |
607 | ||
0139418c MH |
608 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
609 | if (!conn) | |
1da177e4 | 610 | return NULL; |
1da177e4 LT |
611 | |
612 | hcon->l2cap_data = conn; | |
613 | conn->hcon = hcon; | |
614 | ||
0139418c MH |
615 | BT_DBG("hcon %p conn %p", hcon, conn); |
616 | ||
1da177e4 LT |
617 | conn->mtu = hcon->hdev->acl_mtu; |
618 | conn->src = &hcon->hdev->bdaddr; | |
619 | conn->dst = &hcon->dst; | |
620 | ||
4e8402a3 MH |
621 | conn->feat_mask = 0; |
622 | ||
1da177e4 LT |
623 | spin_lock_init(&conn->lock); |
624 | rwlock_init(&conn->chan_list.lock); | |
625 | ||
45054dc1 DY |
626 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
627 | (unsigned long) conn); | |
628 | ||
2950f21a MH |
629 | conn->disc_reason = 0x13; |
630 | ||
1da177e4 LT |
631 | return conn; |
632 | } | |
633 | ||
0139418c | 634 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 635 | { |
0139418c | 636 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
637 | struct sock *sk; |
638 | ||
0139418c MH |
639 | if (!conn) |
640 | return; | |
1da177e4 LT |
641 | |
642 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
643 | ||
7585b97a | 644 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
645 | |
646 | /* Kill channels */ | |
647 | while ((sk = conn->chan_list.head)) { | |
648 | bh_lock_sock(sk); | |
649 | l2cap_chan_del(sk, err); | |
650 | bh_unlock_sock(sk); | |
651 | l2cap_sock_kill(sk); | |
652 | } | |
653 | ||
8e8440f5 DY |
654 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
655 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 656 | |
1da177e4 LT |
657 | hcon->l2cap_data = NULL; |
658 | kfree(conn); | |
1da177e4 LT |
659 | } |
660 | ||
661 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
662 | { | |
663 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 664 | write_lock_bh(&l->lock); |
1da177e4 | 665 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 666 | write_unlock_bh(&l->lock); |
1da177e4 LT |
667 | } |
668 | ||
1da177e4 | 669 | /* ---- Socket interface ---- */ |
8e036fc3 | 670 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
671 | { |
672 | struct sock *sk; | |
673 | struct hlist_node *node; | |
674 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
675 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
676 | goto found; | |
677 | sk = NULL; | |
678 | found: | |
679 | return sk; | |
680 | } | |
681 | ||
682 | /* Find socket with psm and source bdaddr. | |
683 | * Returns closest match. | |
684 | */ | |
8e036fc3 | 685 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
686 | { |
687 | struct sock *sk = NULL, *sk1 = NULL; | |
688 | struct hlist_node *node; | |
689 | ||
690 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
691 | if (state && sk->sk_state != state) | |
692 | continue; | |
693 | ||
694 | if (l2cap_pi(sk)->psm == psm) { | |
695 | /* Exact match. */ | |
696 | if (!bacmp(&bt_sk(sk)->src, src)) | |
697 | break; | |
698 | ||
699 | /* Closest match */ | |
700 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
701 | sk1 = sk; | |
702 | } | |
703 | } | |
704 | return node ? sk : sk1; | |
705 | } | |
706 | ||
707 | /* Find socket with given address (psm, src). | |
708 | * Returns locked socket */ | |
8e036fc3 | 709 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
710 | { |
711 | struct sock *s; | |
712 | read_lock(&l2cap_sk_list.lock); | |
713 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
714 | if (s) |
715 | bh_lock_sock(s); | |
1da177e4 LT |
716 | read_unlock(&l2cap_sk_list.lock); |
717 | return s; | |
718 | } | |
719 | ||
720 | static void l2cap_sock_destruct(struct sock *sk) | |
721 | { | |
722 | BT_DBG("sk %p", sk); | |
723 | ||
724 | skb_queue_purge(&sk->sk_receive_queue); | |
725 | skb_queue_purge(&sk->sk_write_queue); | |
726 | } | |
727 | ||
728 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
729 | { | |
730 | struct sock *sk; | |
731 | ||
732 | BT_DBG("parent %p", parent); | |
733 | ||
734 | /* Close not yet accepted channels */ | |
735 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
736 | l2cap_sock_close(sk); | |
737 | ||
b1235d79 | 738 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
739 | sock_set_flag(parent, SOCK_ZAPPED); |
740 | } | |
741 | ||
742 | /* Kill socket (only if zapped and orphan) | |
743 | * Must be called on unlocked socket. | |
744 | */ | |
745 | static void l2cap_sock_kill(struct sock *sk) | |
746 | { | |
747 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
748 | return; | |
749 | ||
750 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
751 | ||
752 | /* Kill poor orphan */ | |
753 | bt_sock_unlink(&l2cap_sk_list, sk); | |
754 | sock_set_flag(sk, SOCK_DEAD); | |
755 | sock_put(sk); | |
756 | } | |
757 | ||
758 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
759 | { | |
760 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
761 | ||
762 | switch (sk->sk_state) { | |
763 | case BT_LISTEN: | |
764 | l2cap_sock_cleanup_listen(sk); | |
765 | break; | |
766 | ||
767 | case BT_CONNECTED: | |
768 | case BT_CONFIG: | |
bd3c9e25 GP |
769 | if (sk->sk_type == SOCK_SEQPACKET || |
770 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 771 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 | 772 | |
1da177e4 | 773 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
9b108fc0 | 774 | l2cap_send_disconn_req(conn, sk, reason); |
b1235d79 | 775 | } else |
1da177e4 | 776 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
777 | break; |
778 | ||
f66dc81f | 779 | case BT_CONNECT2: |
bd3c9e25 GP |
780 | if (sk->sk_type == SOCK_SEQPACKET || |
781 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
782 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
783 | struct l2cap_conn_rsp rsp; | |
784 | __u16 result; | |
785 | ||
786 | if (bt_sk(sk)->defer_setup) | |
787 | result = L2CAP_CR_SEC_BLOCK; | |
788 | else | |
789 | result = L2CAP_CR_BAD_PSM; | |
790 | ||
791 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
792 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
793 | rsp.result = cpu_to_le16(result); | |
794 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
795 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
796 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
797 | } else | |
798 | l2cap_chan_del(sk, reason); | |
799 | break; | |
800 | ||
1da177e4 LT |
801 | case BT_CONNECT: |
802 | case BT_DISCONN: | |
803 | l2cap_chan_del(sk, reason); | |
804 | break; | |
805 | ||
806 | default: | |
807 | sock_set_flag(sk, SOCK_ZAPPED); | |
808 | break; | |
809 | } | |
810 | } | |
811 | ||
812 | /* Must be called on unlocked socket. */ | |
813 | static void l2cap_sock_close(struct sock *sk) | |
814 | { | |
815 | l2cap_sock_clear_timer(sk); | |
816 | lock_sock(sk); | |
817 | __l2cap_sock_close(sk, ECONNRESET); | |
818 | release_sock(sk); | |
819 | l2cap_sock_kill(sk); | |
820 | } | |
821 | ||
822 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
823 | { | |
824 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
825 | ||
826 | BT_DBG("sk %p", sk); | |
827 | ||
828 | if (parent) { | |
829 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
830 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
831 | ||
1da177e4 LT |
832 | pi->imtu = l2cap_pi(parent)->imtu; |
833 | pi->omtu = l2cap_pi(parent)->omtu; | |
85eb53c6 | 834 | pi->conf_state = l2cap_pi(parent)->conf_state; |
c6b03cf9 MH |
835 | pi->mode = l2cap_pi(parent)->mode; |
836 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 837 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 838 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
839 | pi->sec_level = l2cap_pi(parent)->sec_level; |
840 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
841 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
842 | } else { |
843 | pi->imtu = L2CAP_DEFAULT_MTU; | |
844 | pi->omtu = 0; | |
85eb53c6 | 845 | if (enable_ertm && sk->sk_type == SOCK_STREAM) { |
bd3c9e25 | 846 | pi->mode = L2CAP_MODE_ERTM; |
85eb53c6 GP |
847 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
848 | } else { | |
bd3c9e25 | 849 | pi->mode = L2CAP_MODE_BASIC; |
85eb53c6 | 850 | } |
fd059b9b | 851 | pi->max_tx = L2CAP_DEFAULT_MAX_TX; |
c6b03cf9 | 852 | pi->fcs = L2CAP_FCS_CRC16; |
fd059b9b | 853 | pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; |
2af6b9d5 MH |
854 | pi->sec_level = BT_SECURITY_LOW; |
855 | pi->role_switch = 0; | |
856 | pi->force_reliable = 0; | |
1da177e4 LT |
857 | } |
858 | ||
859 | /* Default config options */ | |
5dee9e7c | 860 | pi->conf_len = 0; |
1da177e4 | 861 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
862 | skb_queue_head_init(TX_QUEUE(sk)); |
863 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 864 | skb_queue_head_init(BUSY_QUEUE(sk)); |
45054dc1 | 865 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
1da177e4 LT |
866 | } |
867 | ||
868 | static struct proto l2cap_proto = { | |
869 | .name = "L2CAP", | |
870 | .owner = THIS_MODULE, | |
871 | .obj_size = sizeof(struct l2cap_pinfo) | |
872 | }; | |
873 | ||
1b8d7ae4 | 874 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
875 | { |
876 | struct sock *sk; | |
877 | ||
6257ff21 | 878 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
879 | if (!sk) |
880 | return NULL; | |
881 | ||
882 | sock_init_data(sock, sk); | |
883 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
884 | ||
885 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 886 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
887 | |
888 | sock_reset_flag(sk, SOCK_ZAPPED); | |
889 | ||
890 | sk->sk_protocol = proto; | |
b1235d79 | 891 | sk->sk_state = BT_OPEN; |
1da177e4 | 892 | |
b1235d79 | 893 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
894 | |
895 | bt_sock_link(&l2cap_sk_list, sk); | |
896 | return sk; | |
897 | } | |
898 | ||
3f378b68 EP |
899 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
900 | int kern) | |
1da177e4 LT |
901 | { |
902 | struct sock *sk; | |
903 | ||
904 | BT_DBG("sock %p", sock); | |
905 | ||
906 | sock->state = SS_UNCONNECTED; | |
907 | ||
bd3c9e25 | 908 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
909 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
910 | return -ESOCKTNOSUPPORT; | |
911 | ||
c84b3268 | 912 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
913 | return -EPERM; |
914 | ||
915 | sock->ops = &l2cap_sock_ops; | |
916 | ||
1b8d7ae4 | 917 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
918 | if (!sk) |
919 | return -ENOMEM; | |
920 | ||
921 | l2cap_sock_init(sk, NULL); | |
922 | return 0; | |
923 | } | |
924 | ||
f29972de | 925 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 926 | { |
1da177e4 | 927 | struct sock *sk = sock->sk; |
f29972de MH |
928 | struct sockaddr_l2 la; |
929 | int len, err = 0; | |
1da177e4 | 930 | |
f29972de | 931 | BT_DBG("sk %p", sk); |
1da177e4 LT |
932 | |
933 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
934 | return -EINVAL; | |
935 | ||
f29972de MH |
936 | memset(&la, 0, sizeof(la)); |
937 | len = min_t(unsigned int, sizeof(la), alen); | |
938 | memcpy(&la, addr, len); | |
939 | ||
2a517ca6 MH |
940 | if (la.l2_cid) |
941 | return -EINVAL; | |
942 | ||
1da177e4 LT |
943 | lock_sock(sk); |
944 | ||
945 | if (sk->sk_state != BT_OPEN) { | |
946 | err = -EBADFD; | |
947 | goto done; | |
948 | } | |
949 | ||
b4324b5d | 950 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
951 | !capable(CAP_NET_BIND_SERVICE)) { |
952 | err = -EACCES; | |
953 | goto done; | |
954 | } | |
8e87d142 | 955 | |
1da177e4 LT |
956 | write_lock_bh(&l2cap_sk_list.lock); |
957 | ||
f29972de | 958 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
959 | err = -EADDRINUSE; |
960 | } else { | |
961 | /* Save source address */ | |
f29972de MH |
962 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
963 | l2cap_pi(sk)->psm = la.l2_psm; | |
964 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 965 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 966 | |
b4324b5d MH |
967 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
968 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 969 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
970 | } |
971 | ||
972 | write_unlock_bh(&l2cap_sk_list.lock); | |
973 | ||
974 | done: | |
975 | release_sock(sk); | |
976 | return err; | |
977 | } | |
978 | ||
979 | static int l2cap_do_connect(struct sock *sk) | |
980 | { | |
981 | bdaddr_t *src = &bt_sk(sk)->src; | |
982 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
983 | struct l2cap_conn *conn; | |
984 | struct hci_conn *hcon; | |
985 | struct hci_dev *hdev; | |
09ab6f4c | 986 | __u8 auth_type; |
44d0e48e | 987 | int err; |
1da177e4 | 988 | |
f29972de MH |
989 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
990 | l2cap_pi(sk)->psm); | |
1da177e4 | 991 | |
af05b30b GP |
992 | hdev = hci_get_route(dst, src); |
993 | if (!hdev) | |
1da177e4 LT |
994 | return -EHOSTUNREACH; |
995 | ||
996 | hci_dev_lock_bh(hdev); | |
997 | ||
998 | err = -ENOMEM; | |
999 | ||
8c1b2355 | 1000 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
1001 | switch (l2cap_pi(sk)->sec_level) { |
1002 | case BT_SECURITY_HIGH: | |
8c1b2355 | 1003 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
1004 | break; |
1005 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 1006 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
1007 | break; |
1008 | default: | |
09ab6f4c | 1009 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
1010 | break; |
1011 | } | |
8c1b2355 | 1012 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 1013 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 1014 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 1015 | else |
8c1b2355 | 1016 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
1017 | |
1018 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
1019 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 1020 | } else { |
2af6b9d5 MH |
1021 | switch (l2cap_pi(sk)->sec_level) { |
1022 | case BT_SECURITY_HIGH: | |
8c1b2355 | 1023 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
1024 | break; |
1025 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 1026 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
1027 | break; |
1028 | default: | |
8c1b2355 | 1029 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
1030 | break; |
1031 | } | |
09ab6f4c MH |
1032 | } |
1033 | ||
2af6b9d5 MH |
1034 | hcon = hci_connect(hdev, ACL_LINK, dst, |
1035 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
1036 | if (!hcon) |
1037 | goto done; | |
1038 | ||
1039 | conn = l2cap_conn_add(hcon, 0); | |
1040 | if (!conn) { | |
1041 | hci_conn_put(hcon); | |
1042 | goto done; | |
1043 | } | |
1044 | ||
1045 | err = 0; | |
1046 | ||
1047 | /* Update source addr of the socket */ | |
1048 | bacpy(src, conn->src); | |
1049 | ||
1050 | l2cap_chan_add(conn, sk, NULL); | |
1051 | ||
1052 | sk->sk_state = BT_CONNECT; | |
1053 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1054 | ||
1055 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1056 | if (sk->sk_type != SOCK_SEQPACKET && |
1057 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 LT |
1058 | l2cap_sock_clear_timer(sk); |
1059 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1060 | } else |
1061 | l2cap_do_start(sk); | |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | done: | |
1065 | hci_dev_unlock_bh(hdev); | |
1066 | hci_dev_put(hdev); | |
1067 | return err; | |
1068 | } | |
1069 | ||
1070 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1071 | { | |
1da177e4 | 1072 | struct sock *sk = sock->sk; |
f29972de MH |
1073 | struct sockaddr_l2 la; |
1074 | int len, err = 0; | |
1da177e4 | 1075 | |
1da177e4 LT |
1076 | BT_DBG("sk %p", sk); |
1077 | ||
6503d961 CG |
1078 | if (!addr || alen < sizeof(addr->sa_family) || |
1079 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1080 | return -EINVAL; |
1da177e4 | 1081 | |
f29972de MH |
1082 | memset(&la, 0, sizeof(la)); |
1083 | len = min_t(unsigned int, sizeof(la), alen); | |
1084 | memcpy(&la, addr, len); | |
1085 | ||
2a517ca6 MH |
1086 | if (la.l2_cid) |
1087 | return -EINVAL; | |
1088 | ||
1089 | lock_sock(sk); | |
1090 | ||
bd3c9e25 GP |
1091 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1092 | && !la.l2_psm) { | |
1da177e4 LT |
1093 | err = -EINVAL; |
1094 | goto done; | |
1095 | } | |
1096 | ||
c6b03cf9 MH |
1097 | switch (l2cap_pi(sk)->mode) { |
1098 | case L2CAP_MODE_BASIC: | |
1099 | break; | |
1100 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1101 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1102 | if (enable_ertm) |
1103 | break; | |
1104 | /* fall through */ | |
1105 | default: | |
1106 | err = -ENOTSUPP; | |
1107 | goto done; | |
1108 | } | |
1109 | ||
af05b30b | 1110 | switch (sk->sk_state) { |
1da177e4 LT |
1111 | case BT_CONNECT: |
1112 | case BT_CONNECT2: | |
1113 | case BT_CONFIG: | |
1114 | /* Already connecting */ | |
1115 | goto wait; | |
1116 | ||
1117 | case BT_CONNECTED: | |
1118 | /* Already connected */ | |
1119 | goto done; | |
1120 | ||
1121 | case BT_OPEN: | |
1122 | case BT_BOUND: | |
1123 | /* Can connect */ | |
1124 | break; | |
1125 | ||
1126 | default: | |
1127 | err = -EBADFD; | |
1128 | goto done; | |
1129 | } | |
1130 | ||
1131 | /* Set destination address and psm */ | |
f29972de MH |
1132 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1133 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1134 | |
af05b30b GP |
1135 | err = l2cap_do_connect(sk); |
1136 | if (err) | |
1da177e4 LT |
1137 | goto done; |
1138 | ||
1139 | wait: | |
1140 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1141 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1142 | done: | |
1143 | release_sock(sk); | |
1144 | return err; | |
1145 | } | |
1146 | ||
1147 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1148 | { | |
1149 | struct sock *sk = sock->sk; | |
1150 | int err = 0; | |
1151 | ||
1152 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1153 | ||
1154 | lock_sock(sk); | |
1155 | ||
bd3c9e25 GP |
1156 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1157 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1158 | err = -EBADFD; |
1159 | goto done; | |
1160 | } | |
1161 | ||
c6b03cf9 MH |
1162 | switch (l2cap_pi(sk)->mode) { |
1163 | case L2CAP_MODE_BASIC: | |
1164 | break; | |
1165 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1166 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1167 | if (enable_ertm) |
1168 | break; | |
1169 | /* fall through */ | |
1170 | default: | |
1171 | err = -ENOTSUPP; | |
1172 | goto done; | |
1173 | } | |
1174 | ||
1da177e4 LT |
1175 | if (!l2cap_pi(sk)->psm) { |
1176 | bdaddr_t *src = &bt_sk(sk)->src; | |
1177 | u16 psm; | |
1178 | ||
1179 | err = -EINVAL; | |
1180 | ||
1181 | write_lock_bh(&l2cap_sk_list.lock); | |
1182 | ||
1183 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1184 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1185 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1186 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1187 | err = 0; |
1188 | break; | |
1189 | } | |
1190 | ||
1191 | write_unlock_bh(&l2cap_sk_list.lock); | |
1192 | ||
1193 | if (err < 0) | |
1194 | goto done; | |
1195 | } | |
1196 | ||
1197 | sk->sk_max_ack_backlog = backlog; | |
1198 | sk->sk_ack_backlog = 0; | |
1199 | sk->sk_state = BT_LISTEN; | |
1200 | ||
1201 | done: | |
1202 | release_sock(sk); | |
1203 | return err; | |
1204 | } | |
1205 | ||
1206 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1207 | { | |
1208 | DECLARE_WAITQUEUE(wait, current); | |
1209 | struct sock *sk = sock->sk, *nsk; | |
1210 | long timeo; | |
1211 | int err = 0; | |
1212 | ||
fcc70d5f | 1213 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1214 | |
1215 | if (sk->sk_state != BT_LISTEN) { | |
1216 | err = -EBADFD; | |
1217 | goto done; | |
1218 | } | |
1219 | ||
1220 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1221 | ||
1222 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1223 | ||
1224 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1225 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1226 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1227 | set_current_state(TASK_INTERRUPTIBLE); | |
1228 | if (!timeo) { | |
1229 | err = -EAGAIN; | |
1230 | break; | |
1231 | } | |
1232 | ||
1233 | release_sock(sk); | |
1234 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1235 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1236 | |
1237 | if (sk->sk_state != BT_LISTEN) { | |
1238 | err = -EBADFD; | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | if (signal_pending(current)) { | |
1243 | err = sock_intr_errno(timeo); | |
1244 | break; | |
1245 | } | |
1246 | } | |
1247 | set_current_state(TASK_RUNNING); | |
aa395145 | 1248 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1249 | |
1250 | if (err) | |
1251 | goto done; | |
1252 | ||
1253 | newsock->state = SS_CONNECTED; | |
1254 | ||
1255 | BT_DBG("new socket %p", nsk); | |
1256 | ||
1257 | done: | |
1258 | release_sock(sk); | |
1259 | return err; | |
1260 | } | |
1261 | ||
1262 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1263 | { | |
1264 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1265 | struct sock *sk = sock->sk; | |
1266 | ||
1267 | BT_DBG("sock %p, sk %p", sock, sk); | |
1268 | ||
1269 | addr->sa_family = AF_BLUETOOTH; | |
1270 | *len = sizeof(struct sockaddr_l2); | |
1271 | ||
f29972de MH |
1272 | if (peer) { |
1273 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1274 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1275 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1276 | } else { |
1277 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1278 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1279 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1280 | } |
1da177e4 | 1281 | |
1da177e4 LT |
1282 | return 0; |
1283 | } | |
1284 | ||
6161c038 GP |
1285 | static int __l2cap_wait_ack(struct sock *sk) |
1286 | { | |
1287 | DECLARE_WAITQUEUE(wait, current); | |
1288 | int err = 0; | |
1289 | int timeo = HZ/5; | |
1290 | ||
2b0b05dd | 1291 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1292 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
1293 | set_current_state(TASK_INTERRUPTIBLE); | |
1294 | ||
1295 | if (!timeo) | |
1296 | timeo = HZ/5; | |
1297 | ||
1298 | if (signal_pending(current)) { | |
1299 | err = sock_intr_errno(timeo); | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | release_sock(sk); | |
1304 | timeo = schedule_timeout(timeo); | |
1305 | lock_sock(sk); | |
1306 | ||
1307 | err = sock_error(sk); | |
1308 | if (err) | |
1309 | break; | |
1310 | } | |
1311 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1312 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1313 | return err; |
1314 | } | |
1315 | ||
e90bac06 GP |
1316 | static void l2cap_monitor_timeout(unsigned long arg) |
1317 | { | |
1318 | struct sock *sk = (void *) arg; | |
e90bac06 | 1319 | |
0e98958d GP |
1320 | BT_DBG("sk %p", sk); |
1321 | ||
e686219a | 1322 | bh_lock_sock(sk); |
e90bac06 | 1323 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 1324 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 1325 | bh_unlock_sock(sk); |
e90bac06 GP |
1326 | return; |
1327 | } | |
1328 | ||
1329 | l2cap_pi(sk)->retry_count++; | |
1330 | __mod_monitor_timer(); | |
1331 | ||
a2e12a2a | 1332 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1333 | bh_unlock_sock(sk); |
e90bac06 GP |
1334 | } |
1335 | ||
1336 | static void l2cap_retrans_timeout(unsigned long arg) | |
1337 | { | |
1338 | struct sock *sk = (void *) arg; | |
e90bac06 | 1339 | |
0e98958d GP |
1340 | BT_DBG("sk %p", sk); |
1341 | ||
e686219a | 1342 | bh_lock_sock(sk); |
e90bac06 GP |
1343 | l2cap_pi(sk)->retry_count = 1; |
1344 | __mod_monitor_timer(); | |
1345 | ||
1346 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1347 | ||
a2e12a2a | 1348 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1349 | bh_unlock_sock(sk); |
e90bac06 GP |
1350 | } |
1351 | ||
1c2acffb | 1352 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1353 | { |
1c2acffb | 1354 | struct sk_buff *skb; |
1da177e4 | 1355 | |
812e737e GP |
1356 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1357 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1358 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1359 | break; | |
1da177e4 | 1360 | |
1c2acffb GP |
1361 | skb = skb_dequeue(TX_QUEUE(sk)); |
1362 | kfree_skb(skb); | |
1da177e4 | 1363 | |
1c2acffb GP |
1364 | l2cap_pi(sk)->unacked_frames--; |
1365 | } | |
1da177e4 | 1366 | |
e90bac06 GP |
1367 | if (!l2cap_pi(sk)->unacked_frames) |
1368 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 1369 | } |
1da177e4 | 1370 | |
9a9c6a34 | 1371 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1372 | { |
1373 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1c2acffb GP |
1374 | |
1375 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1376 | |
9a9c6a34 | 1377 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
1378 | } |
1379 | ||
6840ed07 GP |
1380 | static int l2cap_streaming_send(struct sock *sk) |
1381 | { | |
1382 | struct sk_buff *skb, *tx_skb; | |
1383 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1384 | u16 control, fcs; |
6840ed07 GP |
1385 | |
1386 | while ((skb = sk->sk_send_head)) { | |
1387 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1388 | ||
1389 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1390 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; | |
1391 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1392 | ||
e8235c6b | 1393 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1394 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1395 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1396 | } | |
1397 | ||
9a9c6a34 | 1398 | l2cap_do_send(sk, tx_skb); |
6840ed07 GP |
1399 | |
1400 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1401 | ||
1402 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1403 | sk->sk_send_head = NULL; | |
1404 | else | |
1405 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
1406 | ||
1407 | skb = skb_dequeue(TX_QUEUE(sk)); | |
1408 | kfree_skb(skb); | |
1409 | } | |
1410 | return 0; | |
1411 | } | |
1412 | ||
dfc909be | 1413 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1414 | { |
1415 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1416 | struct sk_buff *skb, *tx_skb; | |
1417 | u16 control, fcs; | |
8f17154f GP |
1418 | |
1419 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1420 | if (!skb) |
1421 | return; | |
8f17154f | 1422 | |
f11d676d GP |
1423 | do { |
1424 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1425 | break; |
8f17154f | 1426 | |
f11d676d GP |
1427 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1428 | return; | |
8f17154f | 1429 | |
f11d676d | 1430 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1431 | |
f11d676d GP |
1432 | if (pi->remote_max_tx && |
1433 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1434 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
f11d676d GP |
1435 | return; |
1436 | } | |
1437 | ||
1438 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1439 | bt_cb(skb)->retries++; | |
1440 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1441 | |
1442 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1443 | control |= L2CAP_CTRL_FINAL; | |
1444 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1445 | } | |
95ffa978 | 1446 | |
f11d676d GP |
1447 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1448 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1449 | |
f11d676d GP |
1450 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1451 | ||
1452 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1453 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1454 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1455 | } | |
1456 | ||
1457 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1458 | } |
1459 | ||
1c2acffb GP |
1460 | static int l2cap_ertm_send(struct sock *sk) |
1461 | { | |
1462 | struct sk_buff *skb, *tx_skb; | |
1463 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1464 | u16 control, fcs; |
9a9c6a34 | 1465 | int nsent = 0; |
1c2acffb | 1466 | |
c13ffa62 GP |
1467 | if (sk->sk_state != BT_CONNECTED) |
1468 | return -ENOTCONN; | |
e90bac06 | 1469 | |
6e2b6722 | 1470 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1471 | |
e90bac06 GP |
1472 | if (pi->remote_max_tx && |
1473 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1474 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1475 | break; |
1476 | } | |
1477 | ||
e420aba3 AE |
1478 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1479 | ||
e90bac06 GP |
1480 | bt_cb(skb)->retries++; |
1481 | ||
1c2acffb | 1482 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1483 | control &= L2CAP_CTRL_SAR; |
1484 | ||
d5392c8f GP |
1485 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1486 | control |= L2CAP_CTRL_FINAL; | |
1487 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1488 | } | |
9f121a5a | 1489 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1490 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1491 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1492 | ||
e90bac06 | 1493 | |
e8235c6b | 1494 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1495 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1496 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1497 | } | |
1498 | ||
9a9c6a34 GP |
1499 | l2cap_do_send(sk, tx_skb); |
1500 | ||
e90bac06 | 1501 | __mod_retrans_timer(); |
1c2acffb GP |
1502 | |
1503 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1504 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1505 | ||
1506 | pi->unacked_frames++; | |
d5392c8f | 1507 | pi->frames_sent++; |
1c2acffb GP |
1508 | |
1509 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1510 | sk->sk_send_head = NULL; | |
1511 | else | |
1512 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1513 | |
1514 | nsent++; | |
1c2acffb GP |
1515 | } |
1516 | ||
9e917af1 GP |
1517 | return nsent; |
1518 | } | |
1519 | ||
dfc909be GP |
1520 | static int l2cap_retransmit_frames(struct sock *sk) |
1521 | { | |
1522 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1523 | int ret; | |
1524 | ||
1525 | spin_lock_bh(&pi->send_lock); | |
1526 | ||
1527 | if (!skb_queue_empty(TX_QUEUE(sk))) | |
1528 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1529 | ||
1530 | pi->next_tx_seq = pi->expected_ack_seq; | |
1531 | ret = l2cap_ertm_send(sk); | |
1532 | ||
1533 | spin_unlock_bh(&pi->send_lock); | |
1534 | ||
1535 | return ret; | |
1536 | } | |
1537 | ||
9a9c6a34 | 1538 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1539 | { |
1540 | struct sock *sk = (struct sock *)pi; | |
1541 | u16 control = 0; | |
dfc909be | 1542 | int nframes; |
9e917af1 GP |
1543 | |
1544 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1545 | ||
1546 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1547 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1548 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1549 | l2cap_send_sframe(pi, control); |
1550 | return; | |
9e917af1 | 1551 | } |
dfc909be GP |
1552 | |
1553 | spin_lock_bh(&pi->send_lock); | |
1554 | nframes = l2cap_ertm_send(sk); | |
1555 | spin_unlock_bh(&pi->send_lock); | |
1556 | ||
1557 | if (nframes > 0) | |
1558 | return; | |
1559 | ||
1560 | control |= L2CAP_SUPER_RCV_READY; | |
1561 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1562 | } |
1563 | ||
9a9c6a34 | 1564 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1565 | { |
1566 | struct srej_list *tail; | |
1567 | u16 control; | |
1568 | ||
1569 | control = L2CAP_SUPER_SELECT_REJECT; | |
1570 | control |= L2CAP_CTRL_FINAL; | |
1571 | ||
1572 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1573 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1574 | ||
1575 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1576 | } |
1577 | ||
1c2acffb GP |
1578 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1579 | { | |
1580 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1581 | struct sk_buff **frag; | |
1582 | int err, sent = 0; | |
1da177e4 | 1583 | |
59203a21 | 1584 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1585 | return -EFAULT; |
1da177e4 LT |
1586 | |
1587 | sent += count; | |
1588 | len -= count; | |
1589 | ||
1590 | /* Continuation fragments (no L2CAP header) */ | |
1591 | frag = &skb_shinfo(skb)->frag_list; | |
1592 | while (len) { | |
1593 | count = min_t(unsigned int, conn->mtu, len); | |
1594 | ||
1595 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1596 | if (!*frag) | |
1c2acffb GP |
1597 | return -EFAULT; |
1598 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) | |
1599 | return -EFAULT; | |
1da177e4 LT |
1600 | |
1601 | sent += count; | |
1602 | len -= count; | |
1603 | ||
1604 | frag = &(*frag)->next; | |
1605 | } | |
1da177e4 LT |
1606 | |
1607 | return sent; | |
1c2acffb | 1608 | } |
1da177e4 | 1609 | |
1c2acffb GP |
1610 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1611 | { | |
1612 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1613 | struct sk_buff *skb; | |
1614 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1615 | struct l2cap_hdr *lh; | |
1616 | ||
1617 | BT_DBG("sk %p len %d", sk, (int)len); | |
1618 | ||
1619 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1620 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1621 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1622 | if (!skb) | |
1623 | return ERR_PTR(-ENOMEM); | |
1624 | ||
1625 | /* Create L2CAP header */ | |
1626 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1627 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1628 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1629 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1630 | ||
1631 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1632 | if (unlikely(err < 0)) { | |
1633 | kfree_skb(skb); | |
1634 | return ERR_PTR(err); | |
1635 | } | |
1636 | return skb; | |
1637 | } | |
1638 | ||
1639 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1640 | { | |
1641 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1642 | struct sk_buff *skb; | |
1643 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1644 | struct l2cap_hdr *lh; | |
1645 | ||
1646 | BT_DBG("sk %p len %d", sk, (int)len); | |
1647 | ||
1648 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1649 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1650 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1651 | if (!skb) | |
1652 | return ERR_PTR(-ENOMEM); | |
1653 | ||
1654 | /* Create L2CAP header */ | |
1655 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1656 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1657 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1658 | ||
1659 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1660 | if (unlikely(err < 0)) { | |
1661 | kfree_skb(skb); | |
1662 | return ERR_PTR(err); | |
1663 | } | |
1664 | return skb; | |
1665 | } | |
1666 | ||
6840ed07 | 1667 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1668 | { |
1669 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1670 | struct sk_buff *skb; | |
1671 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1672 | struct l2cap_hdr *lh; | |
1673 | ||
1674 | BT_DBG("sk %p len %d", sk, (int)len); | |
1675 | ||
0ee0d208 GP |
1676 | if (!conn) |
1677 | return ERR_PTR(-ENOTCONN); | |
1678 | ||
c74e560c GP |
1679 | if (sdulen) |
1680 | hlen += 2; | |
1681 | ||
fcc203c3 GP |
1682 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1683 | hlen += 2; | |
1684 | ||
1c2acffb GP |
1685 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1686 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1687 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1688 | if (!skb) | |
1689 | return ERR_PTR(-ENOMEM); | |
1690 | ||
1691 | /* Create L2CAP header */ | |
1692 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1693 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1694 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1695 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1696 | if (sdulen) |
1697 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1698 | |
1699 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1700 | if (unlikely(err < 0)) { | |
1701 | kfree_skb(skb); | |
1702 | return ERR_PTR(err); | |
1703 | } | |
e90bac06 | 1704 | |
fcc203c3 GP |
1705 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1706 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1707 | ||
e90bac06 | 1708 | bt_cb(skb)->retries = 0; |
1c2acffb | 1709 | return skb; |
1da177e4 LT |
1710 | } |
1711 | ||
c74e560c GP |
1712 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1713 | { | |
1714 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1715 | struct sk_buff *skb; | |
1716 | struct sk_buff_head sar_queue; | |
1717 | u16 control; | |
1718 | size_t size = 0; | |
1719 | ||
ff12fd64 | 1720 | skb_queue_head_init(&sar_queue); |
c74e560c | 1721 | control = L2CAP_SDU_START; |
1c762159 | 1722 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1723 | if (IS_ERR(skb)) |
1724 | return PTR_ERR(skb); | |
1725 | ||
1726 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1727 | len -= pi->remote_mps; |
1728 | size += pi->remote_mps; | |
c74e560c GP |
1729 | |
1730 | while (len > 0) { | |
1731 | size_t buflen; | |
1732 | ||
1c762159 | 1733 | if (len > pi->remote_mps) { |
44651b85 | 1734 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1735 | buflen = pi->remote_mps; |
c74e560c | 1736 | } else { |
44651b85 | 1737 | control = L2CAP_SDU_END; |
c74e560c GP |
1738 | buflen = len; |
1739 | } | |
1740 | ||
6840ed07 | 1741 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1742 | if (IS_ERR(skb)) { |
1743 | skb_queue_purge(&sar_queue); | |
1744 | return PTR_ERR(skb); | |
1745 | } | |
1746 | ||
1747 | __skb_queue_tail(&sar_queue, skb); | |
1748 | len -= buflen; | |
1749 | size += buflen; | |
c74e560c GP |
1750 | } |
1751 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
dfc909be | 1752 | spin_lock_bh(&pi->send_lock); |
c74e560c GP |
1753 | if (sk->sk_send_head == NULL) |
1754 | sk->sk_send_head = sar_queue.next; | |
dfc909be | 1755 | spin_unlock_bh(&pi->send_lock); |
c74e560c GP |
1756 | |
1757 | return size; | |
1758 | } | |
1759 | ||
1da177e4 LT |
1760 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1761 | { | |
1762 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1763 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1764 | struct sk_buff *skb; | |
1765 | u16 control; | |
1766 | int err; | |
1da177e4 LT |
1767 | |
1768 | BT_DBG("sock %p, sk %p", sock, sk); | |
1769 | ||
c1cbe4b7 BL |
1770 | err = sock_error(sk); |
1771 | if (err) | |
1772 | return err; | |
1da177e4 LT |
1773 | |
1774 | if (msg->msg_flags & MSG_OOB) | |
1775 | return -EOPNOTSUPP; | |
1776 | ||
1da177e4 LT |
1777 | lock_sock(sk); |
1778 | ||
1c2acffb | 1779 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1780 | err = -ENOTCONN; |
1c2acffb GP |
1781 | goto done; |
1782 | } | |
1da177e4 | 1783 | |
1c2acffb GP |
1784 | /* Connectionless channel */ |
1785 | if (sk->sk_type == SOCK_DGRAM) { | |
1786 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1787 | if (IS_ERR(skb)) { |
477fffb0 | 1788 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1789 | } else { |
1790 | l2cap_do_send(sk, skb); | |
1791 | err = len; | |
1792 | } | |
1c2acffb GP |
1793 | goto done; |
1794 | } | |
1795 | ||
1796 | switch (pi->mode) { | |
1797 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1798 | /* Check outgoing MTU */ |
1799 | if (len > pi->omtu) { | |
1800 | err = -EINVAL; | |
1801 | goto done; | |
1802 | } | |
1803 | ||
1c2acffb GP |
1804 | /* Create a basic PDU */ |
1805 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1806 | if (IS_ERR(skb)) { | |
1807 | err = PTR_ERR(skb); | |
1808 | goto done; | |
1809 | } | |
1810 | ||
9a9c6a34 GP |
1811 | l2cap_do_send(sk, skb); |
1812 | err = len; | |
1c2acffb GP |
1813 | break; |
1814 | ||
1815 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1816 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1817 | /* Entire SDU fits into one PDU */ |
1c762159 | 1818 | if (len <= pi->remote_mps) { |
1c2acffb | 1819 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1820 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1821 | if (IS_ERR(skb)) { |
1822 | err = PTR_ERR(skb); | |
1823 | goto done; | |
1824 | } | |
c74e560c | 1825 | __skb_queue_tail(TX_QUEUE(sk), skb); |
dfc909be GP |
1826 | |
1827 | if (pi->mode == L2CAP_MODE_ERTM) | |
1828 | spin_lock_bh(&pi->send_lock); | |
1829 | ||
c74e560c GP |
1830 | if (sk->sk_send_head == NULL) |
1831 | sk->sk_send_head = skb; | |
dfc909be GP |
1832 | |
1833 | if (pi->mode == L2CAP_MODE_ERTM) | |
1834 | spin_unlock_bh(&pi->send_lock); | |
1c2acffb | 1835 | } else { |
c74e560c GP |
1836 | /* Segment SDU into multiples PDUs */ |
1837 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1838 | if (err < 0) | |
1839 | goto done; | |
1c2acffb | 1840 | } |
1c2acffb | 1841 | |
dfc909be | 1842 | if (pi->mode == L2CAP_MODE_STREAMING) { |
6840ed07 | 1843 | err = l2cap_streaming_send(sk); |
dfc909be | 1844 | } else { |
6e2b6722 GP |
1845 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && |
1846 | pi->conn_state && L2CAP_CONN_WAIT_F) { | |
1847 | err = len; | |
1848 | break; | |
1849 | } | |
dfc909be | 1850 | spin_lock_bh(&pi->send_lock); |
6840ed07 | 1851 | err = l2cap_ertm_send(sk); |
dfc909be GP |
1852 | spin_unlock_bh(&pi->send_lock); |
1853 | } | |
6840ed07 | 1854 | |
9e917af1 | 1855 | if (err >= 0) |
1c2acffb GP |
1856 | err = len; |
1857 | break; | |
1858 | ||
1859 | default: | |
1860 | BT_DBG("bad state %1.1x", pi->mode); | |
1861 | err = -EINVAL; | |
1862 | } | |
1863 | ||
1864 | done: | |
1da177e4 LT |
1865 | release_sock(sk); |
1866 | return err; | |
1867 | } | |
1868 | ||
f66dc81f MH |
1869 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1870 | { | |
1871 | struct sock *sk = sock->sk; | |
1872 | ||
1873 | lock_sock(sk); | |
1874 | ||
1875 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1876 | struct l2cap_conn_rsp rsp; | |
1877 | ||
1878 | sk->sk_state = BT_CONFIG; | |
1879 | ||
1880 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1881 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1882 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1883 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1884 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1885 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1886 | ||
1887 | release_sock(sk); | |
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | release_sock(sk); | |
1892 | ||
1893 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1894 | } | |
1895 | ||
b7058842 | 1896 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1897 | { |
1898 | struct sock *sk = sock->sk; | |
1899 | struct l2cap_options opts; | |
f29972de | 1900 | int len, err = 0; |
1da177e4 LT |
1901 | u32 opt; |
1902 | ||
1903 | BT_DBG("sk %p", sk); | |
1904 | ||
1905 | lock_sock(sk); | |
1906 | ||
1907 | switch (optname) { | |
1908 | case L2CAP_OPTIONS: | |
0878b666 MH |
1909 | opts.imtu = l2cap_pi(sk)->imtu; |
1910 | opts.omtu = l2cap_pi(sk)->omtu; | |
1911 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1912 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1913 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1914 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1915 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1916 | |
1da177e4 LT |
1917 | len = min_t(unsigned int, sizeof(opts), optlen); |
1918 | if (copy_from_user((char *) &opts, optval, len)) { | |
1919 | err = -EFAULT; | |
1920 | break; | |
1921 | } | |
0878b666 | 1922 | |
45d65c46 GP |
1923 | if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { |
1924 | err = -EINVAL; | |
1925 | break; | |
1926 | } | |
1927 | ||
0041ecfa JPRV |
1928 | l2cap_pi(sk)->mode = opts.mode; |
1929 | switch (l2cap_pi(sk)->mode) { | |
1930 | case L2CAP_MODE_BASIC: | |
85eb53c6 | 1931 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; |
0041ecfa JPRV |
1932 | break; |
1933 | case L2CAP_MODE_ERTM: | |
1934 | case L2CAP_MODE_STREAMING: | |
1935 | if (enable_ertm) | |
1936 | break; | |
1937 | /* fall through */ | |
1938 | default: | |
1939 | err = -EINVAL; | |
1940 | break; | |
1941 | } | |
1942 | ||
c6b03cf9 MH |
1943 | l2cap_pi(sk)->imtu = opts.imtu; |
1944 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1945 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1946 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1947 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1948 | break; |
1949 | ||
1950 | case L2CAP_LM: | |
1951 | if (get_user(opt, (u32 __user *) optval)) { | |
1952 | err = -EFAULT; | |
1953 | break; | |
1954 | } | |
1955 | ||
2af6b9d5 MH |
1956 | if (opt & L2CAP_LM_AUTH) |
1957 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1958 | if (opt & L2CAP_LM_ENCRYPT) | |
1959 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1960 | if (opt & L2CAP_LM_SECURE) | |
1961 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1962 | ||
1963 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1964 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1965 | break; |
1966 | ||
1967 | default: | |
1968 | err = -ENOPROTOOPT; | |
1969 | break; | |
1970 | } | |
1971 | ||
1972 | release_sock(sk); | |
1973 | return err; | |
1974 | } | |
1975 | ||
b7058842 | 1976 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1977 | { |
1978 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1979 | struct bt_security sec; |
1980 | int len, err = 0; | |
f66dc81f | 1981 | u32 opt; |
d58daf42 MH |
1982 | |
1983 | BT_DBG("sk %p", sk); | |
1984 | ||
1985 | if (level == SOL_L2CAP) | |
1986 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1987 | ||
0588d94f MH |
1988 | if (level != SOL_BLUETOOTH) |
1989 | return -ENOPROTOOPT; | |
1990 | ||
d58daf42 MH |
1991 | lock_sock(sk); |
1992 | ||
1993 | switch (optname) { | |
2af6b9d5 | 1994 | case BT_SECURITY: |
bd3c9e25 GP |
1995 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1996 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1997 | err = -EINVAL; |
1998 | break; | |
1999 | } | |
2000 | ||
2af6b9d5 MH |
2001 | sec.level = BT_SECURITY_LOW; |
2002 | ||
2003 | len = min_t(unsigned int, sizeof(sec), optlen); | |
2004 | if (copy_from_user((char *) &sec, optval, len)) { | |
2005 | err = -EFAULT; | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | if (sec.level < BT_SECURITY_LOW || | |
2010 | sec.level > BT_SECURITY_HIGH) { | |
2011 | err = -EINVAL; | |
2012 | break; | |
2013 | } | |
2014 | ||
2015 | l2cap_pi(sk)->sec_level = sec.level; | |
2016 | break; | |
2017 | ||
f66dc81f MH |
2018 | case BT_DEFER_SETUP: |
2019 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2020 | err = -EINVAL; | |
2021 | break; | |
2022 | } | |
2023 | ||
2024 | if (get_user(opt, (u32 __user *) optval)) { | |
2025 | err = -EFAULT; | |
2026 | break; | |
2027 | } | |
2028 | ||
2029 | bt_sk(sk)->defer_setup = opt; | |
2030 | break; | |
2031 | ||
d58daf42 MH |
2032 | default: |
2033 | err = -ENOPROTOOPT; | |
2034 | break; | |
2035 | } | |
2036 | ||
2037 | release_sock(sk); | |
2038 | return err; | |
2039 | } | |
2040 | ||
2041 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
2042 | { |
2043 | struct sock *sk = sock->sk; | |
2044 | struct l2cap_options opts; | |
2045 | struct l2cap_conninfo cinfo; | |
2046 | int len, err = 0; | |
2af6b9d5 | 2047 | u32 opt; |
1da177e4 LT |
2048 | |
2049 | BT_DBG("sk %p", sk); | |
2050 | ||
2051 | if (get_user(len, optlen)) | |
2052 | return -EFAULT; | |
2053 | ||
2054 | lock_sock(sk); | |
2055 | ||
2056 | switch (optname) { | |
2057 | case L2CAP_OPTIONS: | |
2058 | opts.imtu = l2cap_pi(sk)->imtu; | |
2059 | opts.omtu = l2cap_pi(sk)->omtu; | |
2060 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 2061 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 2062 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 2063 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 2064 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
2065 | |
2066 | len = min_t(unsigned int, len, sizeof(opts)); | |
2067 | if (copy_to_user(optval, (char *) &opts, len)) | |
2068 | err = -EFAULT; | |
2069 | ||
2070 | break; | |
2071 | ||
2072 | case L2CAP_LM: | |
2af6b9d5 MH |
2073 | switch (l2cap_pi(sk)->sec_level) { |
2074 | case BT_SECURITY_LOW: | |
2075 | opt = L2CAP_LM_AUTH; | |
2076 | break; | |
2077 | case BT_SECURITY_MEDIUM: | |
2078 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
2079 | break; | |
2080 | case BT_SECURITY_HIGH: | |
2081 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
2082 | L2CAP_LM_SECURE; | |
2083 | break; | |
2084 | default: | |
2085 | opt = 0; | |
2086 | break; | |
2087 | } | |
2088 | ||
2089 | if (l2cap_pi(sk)->role_switch) | |
2090 | opt |= L2CAP_LM_MASTER; | |
2091 | ||
2092 | if (l2cap_pi(sk)->force_reliable) | |
2093 | opt |= L2CAP_LM_RELIABLE; | |
2094 | ||
2095 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
2096 | err = -EFAULT; |
2097 | break; | |
2098 | ||
2099 | case L2CAP_CONNINFO: | |
f66dc81f MH |
2100 | if (sk->sk_state != BT_CONNECTED && |
2101 | !(sk->sk_state == BT_CONNECT2 && | |
2102 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
2103 | err = -ENOTCONN; |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
2108 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
2109 | ||
2110 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
2111 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
2112 | err = -EFAULT; | |
2113 | ||
2114 | break; | |
2115 | ||
2116 | default: | |
2117 | err = -ENOPROTOOPT; | |
2118 | break; | |
2119 | } | |
2120 | ||
2121 | release_sock(sk); | |
2122 | return err; | |
2123 | } | |
2124 | ||
d58daf42 MH |
2125 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
2126 | { | |
2127 | struct sock *sk = sock->sk; | |
2af6b9d5 | 2128 | struct bt_security sec; |
d58daf42 MH |
2129 | int len, err = 0; |
2130 | ||
2131 | BT_DBG("sk %p", sk); | |
2132 | ||
2133 | if (level == SOL_L2CAP) | |
2134 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
2135 | ||
0588d94f MH |
2136 | if (level != SOL_BLUETOOTH) |
2137 | return -ENOPROTOOPT; | |
2138 | ||
d58daf42 MH |
2139 | if (get_user(len, optlen)) |
2140 | return -EFAULT; | |
2141 | ||
2142 | lock_sock(sk); | |
2143 | ||
2144 | switch (optname) { | |
2af6b9d5 | 2145 | case BT_SECURITY: |
bd3c9e25 GP |
2146 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2147 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2148 | err = -EINVAL; |
2149 | break; | |
2150 | } | |
2151 | ||
2af6b9d5 MH |
2152 | sec.level = l2cap_pi(sk)->sec_level; |
2153 | ||
2154 | len = min_t(unsigned int, len, sizeof(sec)); | |
2155 | if (copy_to_user(optval, (char *) &sec, len)) | |
2156 | err = -EFAULT; | |
2157 | ||
2158 | break; | |
2159 | ||
f66dc81f MH |
2160 | case BT_DEFER_SETUP: |
2161 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2162 | err = -EINVAL; | |
2163 | break; | |
2164 | } | |
2165 | ||
2166 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2167 | err = -EFAULT; | |
2168 | ||
2169 | break; | |
2170 | ||
d58daf42 MH |
2171 | default: |
2172 | err = -ENOPROTOOPT; | |
2173 | break; | |
2174 | } | |
2175 | ||
2176 | release_sock(sk); | |
2177 | return err; | |
2178 | } | |
2179 | ||
1da177e4 LT |
2180 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2181 | { | |
2182 | struct sock *sk = sock->sk; | |
2183 | int err = 0; | |
2184 | ||
2185 | BT_DBG("sock %p, sk %p", sock, sk); | |
2186 | ||
2187 | if (!sk) | |
2188 | return 0; | |
2189 | ||
2190 | lock_sock(sk); | |
2191 | if (!sk->sk_shutdown) { | |
6161c038 GP |
2192 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2193 | err = __l2cap_wait_ack(sk); | |
2194 | ||
1da177e4 LT |
2195 | sk->sk_shutdown = SHUTDOWN_MASK; |
2196 | l2cap_sock_clear_timer(sk); | |
2197 | __l2cap_sock_close(sk, 0); | |
2198 | ||
2199 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2200 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2201 | sk->sk_lingertime); | |
1da177e4 | 2202 | } |
9b108fc0 GP |
2203 | |
2204 | if (!err && sk->sk_err) | |
2205 | err = -sk->sk_err; | |
2206 | ||
1da177e4 LT |
2207 | release_sock(sk); |
2208 | return err; | |
2209 | } | |
2210 | ||
2211 | static int l2cap_sock_release(struct socket *sock) | |
2212 | { | |
2213 | struct sock *sk = sock->sk; | |
2214 | int err; | |
2215 | ||
2216 | BT_DBG("sock %p, sk %p", sock, sk); | |
2217 | ||
2218 | if (!sk) | |
2219 | return 0; | |
2220 | ||
2221 | err = l2cap_sock_shutdown(sock, 2); | |
2222 | ||
2223 | sock_orphan(sk); | |
2224 | l2cap_sock_kill(sk); | |
2225 | return err; | |
2226 | } | |
2227 | ||
1da177e4 LT |
2228 | static void l2cap_chan_ready(struct sock *sk) |
2229 | { | |
2230 | struct sock *parent = bt_sk(sk)->parent; | |
2231 | ||
2232 | BT_DBG("sk %p, parent %p", sk, parent); | |
2233 | ||
2234 | l2cap_pi(sk)->conf_state = 0; | |
2235 | l2cap_sock_clear_timer(sk); | |
2236 | ||
2237 | if (!parent) { | |
2238 | /* Outgoing channel. | |
2239 | * Wake up socket sleeping on connect. | |
2240 | */ | |
2241 | sk->sk_state = BT_CONNECTED; | |
2242 | sk->sk_state_change(sk); | |
2243 | } else { | |
2244 | /* Incoming channel. | |
2245 | * Wake up socket sleeping on accept. | |
2246 | */ | |
2247 | parent->sk_data_ready(parent, 0); | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | /* Copy frame to all raw sockets on that connection */ | |
2252 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2253 | { | |
2254 | struct l2cap_chan_list *l = &conn->chan_list; | |
2255 | struct sk_buff *nskb; | |
af05b30b | 2256 | struct sock *sk; |
1da177e4 LT |
2257 | |
2258 | BT_DBG("conn %p", conn); | |
2259 | ||
2260 | read_lock(&l->lock); | |
2261 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2262 | if (sk->sk_type != SOCK_RAW) | |
2263 | continue; | |
2264 | ||
2265 | /* Don't send frame to the socket it came from */ | |
2266 | if (skb->sk == sk) | |
2267 | continue; | |
af05b30b GP |
2268 | nskb = skb_clone(skb, GFP_ATOMIC); |
2269 | if (!nskb) | |
1da177e4 LT |
2270 | continue; |
2271 | ||
2272 | if (sock_queue_rcv_skb(sk, nskb)) | |
2273 | kfree_skb(nskb); | |
2274 | } | |
2275 | read_unlock(&l->lock); | |
2276 | } | |
2277 | ||
2278 | /* ---- L2CAP signalling commands ---- */ | |
2279 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2280 | u8 code, u8 ident, u16 dlen, void *data) | |
2281 | { | |
2282 | struct sk_buff *skb, **frag; | |
2283 | struct l2cap_cmd_hdr *cmd; | |
2284 | struct l2cap_hdr *lh; | |
2285 | int len, count; | |
2286 | ||
af05b30b GP |
2287 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2288 | conn, code, ident, dlen); | |
1da177e4 LT |
2289 | |
2290 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2291 | count = min_t(unsigned int, conn->mtu, len); | |
2292 | ||
2293 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2294 | if (!skb) | |
2295 | return NULL; | |
2296 | ||
2297 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2298 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2299 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2300 | |
2301 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2302 | cmd->code = code; | |
2303 | cmd->ident = ident; | |
aca3192c | 2304 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2305 | |
2306 | if (dlen) { | |
2307 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2308 | memcpy(skb_put(skb, count), data, count); | |
2309 | data += count; | |
2310 | } | |
2311 | ||
2312 | len -= skb->len; | |
2313 | ||
2314 | /* Continuation fragments (no L2CAP header) */ | |
2315 | frag = &skb_shinfo(skb)->frag_list; | |
2316 | while (len) { | |
2317 | count = min_t(unsigned int, conn->mtu, len); | |
2318 | ||
2319 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2320 | if (!*frag) | |
2321 | goto fail; | |
2322 | ||
2323 | memcpy(skb_put(*frag, count), data, count); | |
2324 | ||
2325 | len -= count; | |
2326 | data += count; | |
2327 | ||
2328 | frag = &(*frag)->next; | |
2329 | } | |
2330 | ||
2331 | return skb; | |
2332 | ||
2333 | fail: | |
2334 | kfree_skb(skb); | |
2335 | return NULL; | |
2336 | } | |
2337 | ||
2338 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2339 | { | |
2340 | struct l2cap_conf_opt *opt = *ptr; | |
2341 | int len; | |
2342 | ||
2343 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2344 | *ptr += len; | |
2345 | ||
2346 | *type = opt->type; | |
2347 | *olen = opt->len; | |
2348 | ||
2349 | switch (opt->len) { | |
2350 | case 1: | |
2351 | *val = *((u8 *) opt->val); | |
2352 | break; | |
2353 | ||
2354 | case 2: | |
861d6882 | 2355 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
2356 | break; |
2357 | ||
2358 | case 4: | |
861d6882 | 2359 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
2360 | break; |
2361 | ||
2362 | default: | |
2363 | *val = (unsigned long) opt->val; | |
2364 | break; | |
2365 | } | |
2366 | ||
2367 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2368 | return len; | |
2369 | } | |
2370 | ||
1da177e4 LT |
2371 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2372 | { | |
2373 | struct l2cap_conf_opt *opt = *ptr; | |
2374 | ||
2375 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2376 | ||
2377 | opt->type = type; | |
2378 | opt->len = len; | |
2379 | ||
2380 | switch (len) { | |
2381 | case 1: | |
2382 | *((u8 *) opt->val) = val; | |
2383 | break; | |
2384 | ||
2385 | case 2: | |
8e036fc3 | 2386 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
2387 | break; |
2388 | ||
2389 | case 4: | |
8e036fc3 | 2390 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
2391 | break; |
2392 | ||
2393 | default: | |
2394 | memcpy(opt->val, (void *) val, len); | |
2395 | break; | |
2396 | } | |
2397 | ||
2398 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2399 | } | |
2400 | ||
c1b4f43b GP |
2401 | static void l2cap_ack_timeout(unsigned long arg) |
2402 | { | |
2403 | struct sock *sk = (void *) arg; | |
2404 | ||
2405 | bh_lock_sock(sk); | |
2406 | l2cap_send_ack(l2cap_pi(sk)); | |
2407 | bh_unlock_sock(sk); | |
2408 | } | |
2409 | ||
0565c1c2 GP |
2410 | static inline void l2cap_ertm_init(struct sock *sk) |
2411 | { | |
2412 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2413 | l2cap_pi(sk)->unacked_frames = 0; | |
2414 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2415 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2416 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2417 | |
2418 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2419 | l2cap_retrans_timeout, (unsigned long) sk); | |
2420 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2421 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2422 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2423 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2424 | |
2425 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 2426 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
dfc909be | 2427 | spin_lock_init(&l2cap_pi(sk)->send_lock); |
1890d36b GP |
2428 | |
2429 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
0565c1c2 GP |
2430 | } |
2431 | ||
f2fcfcd6 GP |
2432 | static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
2433 | { | |
2434 | u32 local_feat_mask = l2cap_feat_mask; | |
2435 | if (enable_ertm) | |
6840ed07 | 2436 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
f2fcfcd6 GP |
2437 | |
2438 | switch (mode) { | |
2439 | case L2CAP_MODE_ERTM: | |
2440 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
2441 | case L2CAP_MODE_STREAMING: | |
2442 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
2443 | default: | |
2444 | return 0x00; | |
2445 | } | |
2446 | } | |
2447 | ||
2448 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) | |
2449 | { | |
2450 | switch (mode) { | |
2451 | case L2CAP_MODE_STREAMING: | |
2452 | case L2CAP_MODE_ERTM: | |
2453 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2454 | return mode; | |
2455 | /* fall through */ | |
2456 | default: | |
2457 | return L2CAP_MODE_BASIC; | |
2458 | } | |
2459 | } | |
2460 | ||
1da177e4 LT |
2461 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2462 | { | |
2463 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2464 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2465 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2466 | void *ptr = req->data; |
2467 | ||
2468 | BT_DBG("sk %p", sk); | |
2469 | ||
f2fcfcd6 GP |
2470 | if (pi->num_conf_req || pi->num_conf_rsp) |
2471 | goto done; | |
2472 | ||
2473 | switch (pi->mode) { | |
2474 | case L2CAP_MODE_STREAMING: | |
2475 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
2476 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
2477 | pi->mode = l2cap_select_mode(rfc.mode, | |
2478 | pi->conn->feat_mask); | |
2479 | break; | |
2480 | } | |
2481 | ||
22121fc9 | 2482 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
9b108fc0 | 2483 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
f2fcfcd6 GP |
2484 | break; |
2485 | default: | |
2486 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2487 | break; | |
2488 | } | |
2489 | ||
2490 | done: | |
65c7c491 MH |
2491 | switch (pi->mode) { |
2492 | case L2CAP_MODE_BASIC: | |
2493 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
2494 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
62547752 GP |
2495 | |
2496 | rfc.mode = L2CAP_MODE_BASIC; | |
2497 | rfc.txwin_size = 0; | |
2498 | rfc.max_transmit = 0; | |
2499 | rfc.retrans_timeout = 0; | |
2500 | rfc.monitor_timeout = 0; | |
2501 | rfc.max_pdu_size = 0; | |
2502 | ||
65c7c491 MH |
2503 | break; |
2504 | ||
2505 | case L2CAP_MODE_ERTM: | |
2506 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2507 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2508 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2509 | rfc.retrans_timeout = 0; |
2510 | rfc.monitor_timeout = 0; | |
c74e560c | 2511 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2512 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2513 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 2514 | |
fcc203c3 GP |
2515 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2516 | break; | |
2517 | ||
2518 | if (pi->fcs == L2CAP_FCS_NONE || | |
2519 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2520 | pi->fcs = L2CAP_FCS_NONE; | |
2521 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2522 | } | |
f2fcfcd6 GP |
2523 | break; |
2524 | ||
2525 | case L2CAP_MODE_STREAMING: | |
2526 | rfc.mode = L2CAP_MODE_STREAMING; | |
2527 | rfc.txwin_size = 0; | |
2528 | rfc.max_transmit = 0; | |
2529 | rfc.retrans_timeout = 0; | |
2530 | rfc.monitor_timeout = 0; | |
c74e560c | 2531 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2532 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2533 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 2534 | |
fcc203c3 GP |
2535 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2536 | break; | |
2537 | ||
2538 | if (pi->fcs == L2CAP_FCS_NONE || | |
2539 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2540 | pi->fcs = L2CAP_FCS_NONE; | |
2541 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2542 | } | |
65c7c491 MH |
2543 | break; |
2544 | } | |
1da177e4 | 2545 | |
62547752 GP |
2546 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2547 | (unsigned long) &rfc); | |
2548 | ||
1da177e4 LT |
2549 | /* FIXME: Need actual value of the flush timeout */ |
2550 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2551 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2552 | ||
aca3192c YH |
2553 | req->dcid = cpu_to_le16(pi->dcid); |
2554 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2555 | |
2556 | return ptr - data; | |
2557 | } | |
2558 | ||
5dee9e7c | 2559 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2560 | { |
2561 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2562 | struct l2cap_conf_rsp *rsp = data; |
2563 | void *ptr = rsp->data; | |
2564 | void *req = pi->conf_req; | |
2565 | int len = pi->conf_len; | |
2566 | int type, hint, olen; | |
2567 | unsigned long val; | |
6464f35f | 2568 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2569 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2570 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2571 | |
5dee9e7c | 2572 | BT_DBG("sk %p", sk); |
820ae1b8 | 2573 | |
5dee9e7c MH |
2574 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2575 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2576 | |
589d2746 | 2577 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2578 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2579 | |
2580 | switch (type) { | |
2581 | case L2CAP_CONF_MTU: | |
861d6882 | 2582 | mtu = val; |
5dee9e7c MH |
2583 | break; |
2584 | ||
2585 | case L2CAP_CONF_FLUSH_TO: | |
2586 | pi->flush_to = val; | |
2587 | break; | |
2588 | ||
2589 | case L2CAP_CONF_QOS: | |
2590 | break; | |
2591 | ||
6464f35f MH |
2592 | case L2CAP_CONF_RFC: |
2593 | if (olen == sizeof(rfc)) | |
2594 | memcpy(&rfc, (void *) val, olen); | |
2595 | break; | |
2596 | ||
fcc203c3 GP |
2597 | case L2CAP_CONF_FCS: |
2598 | if (val == L2CAP_FCS_NONE) | |
2599 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2600 | ||
2601 | break; | |
2602 | ||
5dee9e7c MH |
2603 | default: |
2604 | if (hint) | |
2605 | break; | |
2606 | ||
2607 | result = L2CAP_CONF_UNKNOWN; | |
2608 | *((u8 *) ptr++) = type; | |
2609 | break; | |
2610 | } | |
2611 | } | |
2612 | ||
f2fcfcd6 GP |
2613 | if (pi->num_conf_rsp || pi->num_conf_req) |
2614 | goto done; | |
2615 | ||
2616 | switch (pi->mode) { | |
2617 | case L2CAP_MODE_STREAMING: | |
2618 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
2619 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
2620 | pi->mode = l2cap_select_mode(rfc.mode, | |
2621 | pi->conn->feat_mask); | |
2622 | break; | |
2623 | } | |
2624 | ||
742e519b | 2625 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 2626 | return -ECONNREFUSED; |
742e519b | 2627 | |
f2fcfcd6 | 2628 | break; |
f2fcfcd6 GP |
2629 | } |
2630 | ||
2631 | done: | |
2632 | if (pi->mode != rfc.mode) { | |
2633 | result = L2CAP_CONF_UNACCEPT; | |
2634 | rfc.mode = pi->mode; | |
2635 | ||
2636 | if (pi->num_conf_rsp == 1) | |
2637 | return -ECONNREFUSED; | |
2638 | ||
2639 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2640 | sizeof(rfc), (unsigned long) &rfc); | |
2641 | } | |
2642 | ||
2643 | ||
5dee9e7c MH |
2644 | if (result == L2CAP_CONF_SUCCESS) { |
2645 | /* Configure output options and let the other side know | |
2646 | * which ones we don't like. */ | |
2647 | ||
f2fcfcd6 GP |
2648 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2649 | result = L2CAP_CONF_UNACCEPT; | |
2650 | else { | |
2651 | pi->omtu = mtu; | |
2652 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2653 | } | |
2654 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2655 | |
f2fcfcd6 GP |
2656 | switch (rfc.mode) { |
2657 | case L2CAP_MODE_BASIC: | |
2658 | pi->fcs = L2CAP_FCS_NONE; | |
2659 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2660 | break; | |
2661 | ||
2662 | case L2CAP_MODE_ERTM: | |
2663 | pi->remote_tx_win = rfc.txwin_size; | |
2664 | pi->remote_max_tx = rfc.max_transmit; | |
1c762159 GP |
2665 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2666 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2667 | ||
2668 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2669 | |
10467e9e GP |
2670 | rfc.retrans_timeout = |
2671 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2672 | rfc.monitor_timeout = | |
2673 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2674 | |
2675 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2676 | |
2677 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2678 | sizeof(rfc), (unsigned long) &rfc); | |
2679 | ||
f2fcfcd6 GP |
2680 | break; |
2681 | ||
2682 | case L2CAP_MODE_STREAMING: | |
1c762159 GP |
2683 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2684 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2685 | ||
2686 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2687 | |
2688 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2689 | |
2690 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2691 | sizeof(rfc), (unsigned long) &rfc); | |
2692 | ||
f2fcfcd6 GP |
2693 | break; |
2694 | ||
2695 | default: | |
5dee9e7c | 2696 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2697 | |
6464f35f | 2698 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2699 | rfc.mode = pi->mode; |
2700 | } | |
6464f35f | 2701 | |
f2fcfcd6 GP |
2702 | if (result == L2CAP_CONF_SUCCESS) |
2703 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2704 | } | |
5dee9e7c MH |
2705 | rsp->scid = cpu_to_le16(pi->dcid); |
2706 | rsp->result = cpu_to_le16(result); | |
2707 | rsp->flags = cpu_to_le16(0x0000); | |
2708 | ||
2709 | return ptr - data; | |
1da177e4 LT |
2710 | } |
2711 | ||
f2fcfcd6 GP |
2712 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2713 | { | |
2714 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2715 | struct l2cap_conf_req *req = data; | |
2716 | void *ptr = req->data; | |
2717 | int type, olen; | |
2718 | unsigned long val; | |
2719 | struct l2cap_conf_rfc rfc; | |
2720 | ||
2721 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2722 | ||
2723 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2724 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2725 | ||
2726 | switch (type) { | |
2727 | case L2CAP_CONF_MTU: | |
2728 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2729 | *result = L2CAP_CONF_UNACCEPT; | |
2730 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; | |
2731 | } else | |
2732 | pi->omtu = val; | |
2733 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
2734 | break; | |
2735 | ||
2736 | case L2CAP_CONF_FLUSH_TO: | |
2737 | pi->flush_to = val; | |
2738 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2739 | 2, pi->flush_to); | |
2740 | break; | |
2741 | ||
2742 | case L2CAP_CONF_RFC: | |
2743 | if (olen == sizeof(rfc)) | |
2744 | memcpy(&rfc, (void *)val, olen); | |
2745 | ||
2746 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2747 | rfc.mode != pi->mode) | |
2748 | return -ECONNREFUSED; | |
2749 | ||
f2fcfcd6 GP |
2750 | pi->fcs = 0; |
2751 | ||
2752 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2753 | sizeof(rfc), (unsigned long) &rfc); | |
2754 | break; | |
2755 | } | |
2756 | } | |
2757 | ||
6c2ea7a8 GP |
2758 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
2759 | return -ECONNREFUSED; | |
2760 | ||
2761 | pi->mode = rfc.mode; | |
2762 | ||
f2fcfcd6 GP |
2763 | if (*result == L2CAP_CONF_SUCCESS) { |
2764 | switch (rfc.mode) { | |
2765 | case L2CAP_MODE_ERTM: | |
2766 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2767 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2768 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2769 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2770 | break; |
2771 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2772 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2773 | } |
2774 | } | |
2775 | ||
2776 | req->dcid = cpu_to_le16(pi->dcid); | |
2777 | req->flags = cpu_to_le16(0x0000); | |
2778 | ||
2779 | return ptr - data; | |
2780 | } | |
2781 | ||
5dee9e7c | 2782 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2783 | { |
2784 | struct l2cap_conf_rsp *rsp = data; | |
2785 | void *ptr = rsp->data; | |
1da177e4 | 2786 | |
5dee9e7c | 2787 | BT_DBG("sk %p", sk); |
1da177e4 | 2788 | |
aca3192c | 2789 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2790 | rsp->result = cpu_to_le16(result); |
aca3192c | 2791 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2792 | |
2793 | return ptr - data; | |
2794 | } | |
2795 | ||
7b1c0049 GP |
2796 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2797 | { | |
2798 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2799 | int type, olen; | |
2800 | unsigned long val; | |
2801 | struct l2cap_conf_rfc rfc; | |
2802 | ||
2803 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2804 | ||
2805 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2806 | return; | |
2807 | ||
2808 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2809 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2810 | ||
2811 | switch (type) { | |
2812 | case L2CAP_CONF_RFC: | |
2813 | if (olen == sizeof(rfc)) | |
2814 | memcpy(&rfc, (void *)val, olen); | |
2815 | goto done; | |
2816 | } | |
2817 | } | |
2818 | ||
2819 | done: | |
2820 | switch (rfc.mode) { | |
2821 | case L2CAP_MODE_ERTM: | |
2822 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2823 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2824 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2825 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2826 | break; | |
2827 | case L2CAP_MODE_STREAMING: | |
2828 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2829 | } | |
2830 | } | |
2831 | ||
4e8402a3 MH |
2832 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2833 | { | |
2834 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2835 | ||
2836 | if (rej->reason != 0x0000) | |
2837 | return 0; | |
2838 | ||
2839 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2840 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2841 | del_timer(&conn->info_timer); |
984947dc MH |
2842 | |
2843 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2844 | conn->info_ident = 0; |
984947dc | 2845 | |
4e8402a3 MH |
2846 | l2cap_conn_start(conn); |
2847 | } | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | ||
1da177e4 LT |
2852 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2853 | { | |
2854 | struct l2cap_chan_list *list = &conn->chan_list; | |
2855 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2856 | struct l2cap_conn_rsp rsp; | |
2857 | struct sock *sk, *parent; | |
e7c29cb1 | 2858 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2859 | |
2860 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2861 | __le16 psm = req->psm; |
1da177e4 LT |
2862 | |
2863 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2864 | ||
2865 | /* Check if we have socket listening on psm */ | |
2866 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2867 | if (!parent) { | |
2868 | result = L2CAP_CR_BAD_PSM; | |
2869 | goto sendresp; | |
2870 | } | |
2871 | ||
e7c29cb1 MH |
2872 | /* Check if the ACL is secure enough (if not SDP) */ |
2873 | if (psm != cpu_to_le16(0x0001) && | |
2874 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2875 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2876 | result = L2CAP_CR_SEC_BLOCK; |
2877 | goto response; | |
2878 | } | |
2879 | ||
1da177e4 LT |
2880 | result = L2CAP_CR_NO_MEM; |
2881 | ||
2882 | /* Check for backlog size */ | |
2883 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2884 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2885 | goto response; |
2886 | } | |
2887 | ||
3b1e0a65 | 2888 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2889 | if (!sk) |
2890 | goto response; | |
2891 | ||
fd1278d7 | 2892 | write_lock_bh(&list->lock); |
1da177e4 LT |
2893 | |
2894 | /* Check if we already have channel with that dcid */ | |
2895 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2896 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2897 | sock_set_flag(sk, SOCK_ZAPPED); |
2898 | l2cap_sock_kill(sk); | |
2899 | goto response; | |
2900 | } | |
2901 | ||
2902 | hci_conn_hold(conn->hcon); | |
2903 | ||
2904 | l2cap_sock_init(sk, parent); | |
2905 | bacpy(&bt_sk(sk)->src, conn->src); | |
2906 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2907 | l2cap_pi(sk)->psm = psm; | |
2908 | l2cap_pi(sk)->dcid = scid; | |
2909 | ||
2910 | __l2cap_chan_add(conn, sk, parent); | |
2911 | dcid = l2cap_pi(sk)->scid; | |
2912 | ||
2913 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2914 | ||
1da177e4 LT |
2915 | l2cap_pi(sk)->ident = cmd->ident; |
2916 | ||
984947dc | 2917 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2918 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2919 | if (bt_sk(sk)->defer_setup) { |
2920 | sk->sk_state = BT_CONNECT2; | |
2921 | result = L2CAP_CR_PEND; | |
2922 | status = L2CAP_CS_AUTHOR_PEND; | |
2923 | parent->sk_data_ready(parent, 0); | |
2924 | } else { | |
2925 | sk->sk_state = BT_CONFIG; | |
2926 | result = L2CAP_CR_SUCCESS; | |
2927 | status = L2CAP_CS_NO_INFO; | |
2928 | } | |
79d554a6 MH |
2929 | } else { |
2930 | sk->sk_state = BT_CONNECT2; | |
2931 | result = L2CAP_CR_PEND; | |
2932 | status = L2CAP_CS_AUTHEN_PEND; | |
2933 | } | |
2934 | } else { | |
2935 | sk->sk_state = BT_CONNECT2; | |
2936 | result = L2CAP_CR_PEND; | |
2937 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2938 | } |
2939 | ||
fd1278d7 | 2940 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2941 | |
2942 | response: | |
2943 | bh_unlock_sock(parent); | |
2944 | ||
2945 | sendresp: | |
aca3192c YH |
2946 | rsp.scid = cpu_to_le16(scid); |
2947 | rsp.dcid = cpu_to_le16(dcid); | |
2948 | rsp.result = cpu_to_le16(result); | |
2949 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2950 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2951 | |
2952 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2953 | struct l2cap_info_req info; | |
2954 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2955 | ||
2956 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2957 | conn->info_ident = l2cap_get_ident(conn); | |
2958 | ||
2959 | mod_timer(&conn->info_timer, jiffies + | |
2960 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2961 | ||
2962 | l2cap_send_cmd(conn, conn->info_ident, | |
2963 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2964 | } | |
2965 | ||
1da177e4 LT |
2966 | return 0; |
2967 | } | |
2968 | ||
2969 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2970 | { | |
2971 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2972 | u16 scid, dcid, result, status; | |
2973 | struct sock *sk; | |
2974 | u8 req[128]; | |
2975 | ||
2976 | scid = __le16_to_cpu(rsp->scid); | |
2977 | dcid = __le16_to_cpu(rsp->dcid); | |
2978 | result = __le16_to_cpu(rsp->result); | |
2979 | status = __le16_to_cpu(rsp->status); | |
2980 | ||
2981 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2982 | ||
2983 | if (scid) { | |
af05b30b GP |
2984 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2985 | if (!sk) | |
1da177e4 LT |
2986 | return 0; |
2987 | } else { | |
af05b30b GP |
2988 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2989 | if (!sk) | |
1da177e4 LT |
2990 | return 0; |
2991 | } | |
2992 | ||
2993 | switch (result) { | |
2994 | case L2CAP_CR_SUCCESS: | |
2995 | sk->sk_state = BT_CONFIG; | |
2996 | l2cap_pi(sk)->ident = 0; | |
2997 | l2cap_pi(sk)->dcid = dcid; | |
2998 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
6a8d3010 MH |
2999 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
3000 | ||
1da177e4 LT |
3001 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3002 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 3003 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3004 | break; |
3005 | ||
3006 | case L2CAP_CR_PEND: | |
6a8d3010 | 3007 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
3008 | break; |
3009 | ||
3010 | default: | |
3011 | l2cap_chan_del(sk, ECONNREFUSED); | |
3012 | break; | |
3013 | } | |
3014 | ||
3015 | bh_unlock_sock(sk); | |
3016 | return 0; | |
3017 | } | |
3018 | ||
88219a0f | 3019 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3020 | { |
3021 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3022 | u16 dcid, flags; | |
3023 | u8 rsp[64]; | |
3024 | struct sock *sk; | |
5dee9e7c | 3025 | int len; |
1da177e4 LT |
3026 | |
3027 | dcid = __le16_to_cpu(req->dcid); | |
3028 | flags = __le16_to_cpu(req->flags); | |
3029 | ||
3030 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3031 | ||
af05b30b GP |
3032 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3033 | if (!sk) | |
1da177e4 LT |
3034 | return -ENOENT; |
3035 | ||
354f60a9 MH |
3036 | if (sk->sk_state == BT_DISCONN) |
3037 | goto unlock; | |
3038 | ||
5dee9e7c | 3039 | /* Reject if config buffer is too small. */ |
88219a0f | 3040 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
3041 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
3042 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3043 | l2cap_build_conf_rsp(sk, rsp, | |
3044 | L2CAP_CONF_REJECT, flags), rsp); | |
3045 | goto unlock; | |
3046 | } | |
3047 | ||
3048 | /* Store config. */ | |
3049 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
3050 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
3051 | |
3052 | if (flags & 0x0001) { | |
3053 | /* Incomplete config. Send empty response. */ | |
3054 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
3055 | l2cap_build_conf_rsp(sk, rsp, |
3056 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
3057 | goto unlock; |
3058 | } | |
3059 | ||
3060 | /* Complete config. */ | |
5dee9e7c | 3061 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 3062 | if (len < 0) { |
9b108fc0 | 3063 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 3064 | goto unlock; |
f2fcfcd6 | 3065 | } |
1da177e4 | 3066 | |
5dee9e7c | 3067 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 3068 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 3069 | |
5dee9e7c MH |
3070 | /* Reset config buffer. */ |
3071 | l2cap_pi(sk)->conf_len = 0; | |
3072 | ||
876d9484 MH |
3073 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
3074 | goto unlock; | |
3075 | ||
1da177e4 | 3076 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
f64f9e71 JP |
3077 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3078 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3079 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3080 | ||
1da177e4 | 3081 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 3082 | |
0565c1c2 GP |
3083 | l2cap_pi(sk)->next_tx_seq = 0; |
3084 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 3085 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3086 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3087 | l2cap_ertm_init(sk); | |
3088 | ||
1da177e4 | 3089 | l2cap_chan_ready(sk); |
876d9484 MH |
3090 | goto unlock; |
3091 | } | |
3092 | ||
3093 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 3094 | u8 buf[64]; |
1da177e4 | 3095 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 3096 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 3097 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3098 | } |
3099 | ||
3100 | unlock: | |
3101 | bh_unlock_sock(sk); | |
3102 | return 0; | |
3103 | } | |
3104 | ||
3105 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3106 | { | |
3107 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3108 | u16 scid, flags, result; | |
3109 | struct sock *sk; | |
7b1c0049 | 3110 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
3111 | |
3112 | scid = __le16_to_cpu(rsp->scid); | |
3113 | flags = __le16_to_cpu(rsp->flags); | |
3114 | result = __le16_to_cpu(rsp->result); | |
3115 | ||
af05b30b GP |
3116 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
3117 | scid, flags, result); | |
1da177e4 | 3118 | |
af05b30b GP |
3119 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3120 | if (!sk) | |
1da177e4 LT |
3121 | return 0; |
3122 | ||
3123 | switch (result) { | |
3124 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 3125 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
3126 | break; |
3127 | ||
3128 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 3129 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3130 | char req[64]; |
3131 | ||
c2c77ec8 | 3132 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 3133 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
3134 | goto done; |
3135 | } | |
3136 | ||
f2fcfcd6 GP |
3137 | /* throw out any old stored conf requests */ |
3138 | result = L2CAP_CONF_SUCCESS; | |
3139 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
3140 | len, req, &result); | |
3141 | if (len < 0) { | |
9b108fc0 | 3142 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
3143 | goto done; |
3144 | } | |
3145 | ||
3146 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3147 | L2CAP_CONF_REQ, len, req); | |
3148 | l2cap_pi(sk)->num_conf_req++; | |
3149 | if (result != L2CAP_CONF_SUCCESS) | |
3150 | goto done; | |
3151 | break; | |
1da177e4 LT |
3152 | } |
3153 | ||
8e87d142 | 3154 | default: |
b1235d79 | 3155 | sk->sk_err = ECONNRESET; |
1da177e4 | 3156 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 3157 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
3158 | goto done; |
3159 | } | |
3160 | ||
3161 | if (flags & 0x01) | |
3162 | goto done; | |
3163 | ||
1da177e4 LT |
3164 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3165 | ||
3166 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
f64f9e71 JP |
3167 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3168 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3169 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3170 | ||
1da177e4 | 3171 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3172 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3173 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3174 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3175 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3176 | l2cap_ertm_init(sk); | |
3177 | ||
1da177e4 LT |
3178 | l2cap_chan_ready(sk); |
3179 | } | |
3180 | ||
3181 | done: | |
3182 | bh_unlock_sock(sk); | |
3183 | return 0; | |
3184 | } | |
3185 | ||
3186 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3187 | { | |
3188 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3189 | struct l2cap_disconn_rsp rsp; | |
3190 | u16 dcid, scid; | |
3191 | struct sock *sk; | |
3192 | ||
3193 | scid = __le16_to_cpu(req->scid); | |
3194 | dcid = __le16_to_cpu(req->dcid); | |
3195 | ||
3196 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3197 | ||
af05b30b GP |
3198 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3199 | if (!sk) | |
1da177e4 LT |
3200 | return 0; |
3201 | ||
aca3192c YH |
3202 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3203 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3204 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3205 | ||
3206 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3207 | ||
3208 | l2cap_chan_del(sk, ECONNRESET); | |
3209 | bh_unlock_sock(sk); | |
3210 | ||
3211 | l2cap_sock_kill(sk); | |
3212 | return 0; | |
3213 | } | |
3214 | ||
3215 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3216 | { | |
3217 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3218 | u16 dcid, scid; | |
3219 | struct sock *sk; | |
3220 | ||
3221 | scid = __le16_to_cpu(rsp->scid); | |
3222 | dcid = __le16_to_cpu(rsp->dcid); | |
3223 | ||
3224 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3225 | ||
af05b30b GP |
3226 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3227 | if (!sk) | |
1da177e4 LT |
3228 | return 0; |
3229 | ||
3230 | l2cap_chan_del(sk, 0); | |
3231 | bh_unlock_sock(sk); | |
3232 | ||
3233 | l2cap_sock_kill(sk); | |
3234 | return 0; | |
3235 | } | |
3236 | ||
3237 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3238 | { | |
3239 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3240 | u16 type; |
3241 | ||
3242 | type = __le16_to_cpu(req->type); | |
3243 | ||
3244 | BT_DBG("type 0x%4.4x", type); | |
3245 | ||
f0709e03 MH |
3246 | if (type == L2CAP_IT_FEAT_MASK) { |
3247 | u8 buf[8]; | |
44dd46de | 3248 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3249 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3250 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3251 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de | 3252 | if (enable_ertm) |
fcc203c3 GP |
3253 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3254 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3255 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3256 | l2cap_send_cmd(conn, cmd->ident, |
3257 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3258 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3259 | u8 buf[12]; | |
3260 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3261 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3262 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3263 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3264 | l2cap_send_cmd(conn, cmd->ident, | |
3265 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3266 | } else { |
3267 | struct l2cap_info_rsp rsp; | |
3268 | rsp.type = cpu_to_le16(type); | |
3269 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3270 | l2cap_send_cmd(conn, cmd->ident, | |
3271 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3272 | } | |
1da177e4 LT |
3273 | |
3274 | return 0; | |
3275 | } | |
3276 | ||
3277 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3278 | { | |
3279 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3280 | u16 type, result; | |
3281 | ||
3282 | type = __le16_to_cpu(rsp->type); | |
3283 | result = __le16_to_cpu(rsp->result); | |
3284 | ||
3285 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3286 | ||
4e8402a3 MH |
3287 | del_timer(&conn->info_timer); |
3288 | ||
984947dc | 3289 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3290 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3291 | |
47ec1dcd | 3292 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3293 | struct l2cap_info_req req; |
3294 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3295 | ||
3296 | conn->info_ident = l2cap_get_ident(conn); | |
3297 | ||
3298 | l2cap_send_cmd(conn, conn->info_ident, | |
3299 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3300 | } else { | |
3301 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3302 | conn->info_ident = 0; | |
3303 | ||
3304 | l2cap_conn_start(conn); | |
3305 | } | |
3306 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3307 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3308 | conn->info_ident = 0; |
984947dc MH |
3309 | |
3310 | l2cap_conn_start(conn); | |
3311 | } | |
4e8402a3 | 3312 | |
1da177e4 LT |
3313 | return 0; |
3314 | } | |
3315 | ||
3316 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3317 | { | |
3318 | u8 *data = skb->data; | |
3319 | int len = skb->len; | |
3320 | struct l2cap_cmd_hdr cmd; | |
3321 | int err = 0; | |
3322 | ||
3323 | l2cap_raw_recv(conn, skb); | |
3324 | ||
3325 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3326 | u16 cmd_len; |
1da177e4 LT |
3327 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3328 | data += L2CAP_CMD_HDR_SIZE; | |
3329 | len -= L2CAP_CMD_HDR_SIZE; | |
3330 | ||
88219a0f | 3331 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3332 | |
88219a0f | 3333 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3334 | |
88219a0f | 3335 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3336 | BT_DBG("corrupted command"); |
3337 | break; | |
3338 | } | |
3339 | ||
3340 | switch (cmd.code) { | |
3341 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3342 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3343 | break; |
3344 | ||
3345 | case L2CAP_CONN_REQ: | |
3346 | err = l2cap_connect_req(conn, &cmd, data); | |
3347 | break; | |
3348 | ||
3349 | case L2CAP_CONN_RSP: | |
3350 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3351 | break; | |
3352 | ||
3353 | case L2CAP_CONF_REQ: | |
88219a0f | 3354 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3355 | break; |
3356 | ||
3357 | case L2CAP_CONF_RSP: | |
3358 | err = l2cap_config_rsp(conn, &cmd, data); | |
3359 | break; | |
3360 | ||
3361 | case L2CAP_DISCONN_REQ: | |
3362 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3363 | break; | |
3364 | ||
3365 | case L2CAP_DISCONN_RSP: | |
3366 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3367 | break; | |
3368 | ||
3369 | case L2CAP_ECHO_REQ: | |
88219a0f | 3370 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3371 | break; |
3372 | ||
3373 | case L2CAP_ECHO_RSP: | |
3374 | break; | |
3375 | ||
3376 | case L2CAP_INFO_REQ: | |
3377 | err = l2cap_information_req(conn, &cmd, data); | |
3378 | break; | |
3379 | ||
3380 | case L2CAP_INFO_RSP: | |
3381 | err = l2cap_information_rsp(conn, &cmd, data); | |
3382 | break; | |
3383 | ||
3384 | default: | |
3385 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3386 | err = -EINVAL; | |
3387 | break; | |
3388 | } | |
3389 | ||
3390 | if (err) { | |
3391 | struct l2cap_cmd_rej rej; | |
3392 | BT_DBG("error %d", err); | |
3393 | ||
3394 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3395 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3396 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3397 | } | |
3398 | ||
88219a0f AV |
3399 | data += cmd_len; |
3400 | len -= cmd_len; | |
1da177e4 LT |
3401 | } |
3402 | ||
3403 | kfree_skb(skb); | |
3404 | } | |
3405 | ||
fcc203c3 GP |
3406 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3407 | { | |
3408 | u16 our_fcs, rcv_fcs; | |
3409 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3410 | ||
3411 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3412 | skb_trim(skb, skb->len - 2); | |
3413 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3414 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3415 | ||
3416 | if (our_fcs != rcv_fcs) | |
3417 | return -EINVAL; | |
3418 | } | |
3419 | return 0; | |
3420 | } | |
3421 | ||
d5392c8f GP |
3422 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3423 | { | |
3424 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3425 | u16 control = 0; | |
3426 | ||
3427 | pi->frames_sent = 0; | |
d5392c8f GP |
3428 | |
3429 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3430 | ||
3431 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 3432 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 3433 | l2cap_send_sframe(pi, control); |
1890d36b | 3434 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
3435 | } |
3436 | ||
4ea727ef GP |
3437 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
3438 | l2cap_retransmit_frames(sk); | |
d5392c8f | 3439 | |
dfc909be | 3440 | spin_lock_bh(&pi->send_lock); |
d5392c8f | 3441 | l2cap_ertm_send(sk); |
dfc909be | 3442 | spin_unlock_bh(&pi->send_lock); |
d5392c8f GP |
3443 | |
3444 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3445 | pi->frames_sent == 0) { | |
3446 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3447 | l2cap_send_sframe(pi, control); |
3448 | } | |
3449 | } | |
3450 | ||
9b53350d | 3451 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3452 | { |
3453 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
3454 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3455 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
3456 | |
3457 | bt_cb(skb)->tx_seq = tx_seq; | |
3458 | bt_cb(skb)->sar = sar; | |
3459 | ||
3460 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3461 | if (!next_skb) { | |
3462 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 3463 | return 0; |
8f17154f GP |
3464 | } |
3465 | ||
bfbacc11 JPRV |
3466 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3467 | if (tx_seq_offset < 0) | |
3468 | tx_seq_offset += 64; | |
3469 | ||
8f17154f | 3470 | do { |
9b53350d JPRV |
3471 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3472 | return -EINVAL; | |
3473 | ||
bfbacc11 JPRV |
3474 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
3475 | pi->buffer_seq) % 64; | |
3476 | if (next_tx_seq_offset < 0) | |
3477 | next_tx_seq_offset += 64; | |
3478 | ||
3479 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 3480 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 3481 | return 0; |
8f17154f GP |
3482 | } |
3483 | ||
3484 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3485 | break; | |
3486 | ||
59203a21 | 3487 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3488 | |
3489 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
3490 | |
3491 | return 0; | |
8f17154f GP |
3492 | } |
3493 | ||
18778a63 GP |
3494 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3495 | { | |
3496 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3497 | struct sk_buff *_skb; | |
1890d36b | 3498 | int err; |
18778a63 GP |
3499 | |
3500 | switch (control & L2CAP_CTRL_SAR) { | |
3501 | case L2CAP_SDU_UNSEGMENTED: | |
3502 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3503 | goto drop; | |
3504 | ||
3505 | err = sock_queue_rcv_skb(sk, skb); | |
3506 | if (!err) | |
3507 | return err; | |
3508 | ||
3509 | break; | |
3510 | ||
3511 | case L2CAP_SDU_START: | |
3512 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3513 | goto drop; | |
3514 | ||
3515 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
3516 | |
3517 | if (pi->sdu_len > pi->imtu) | |
3518 | goto disconnect; | |
3519 | ||
3520 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
3521 | if (!pi->sdu) |
3522 | return -ENOMEM; | |
3523 | ||
3524 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3525 | * condition we have to be sure that this will be executed | |
3526 | * only once, i.e., when alloc does not fail */ | |
3527 | skb_pull(skb, 2); | |
18778a63 GP |
3528 | |
3529 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3530 | ||
3531 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3532 | pi->partial_sdu_len = skb->len; | |
3533 | break; | |
3534 | ||
3535 | case L2CAP_SDU_CONTINUE: | |
3536 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3537 | goto disconnect; | |
3538 | ||
3539 | if (!pi->sdu) | |
3540 | goto disconnect; | |
3541 | ||
18778a63 GP |
3542 | pi->partial_sdu_len += skb->len; |
3543 | if (pi->partial_sdu_len > pi->sdu_len) | |
3544 | goto drop; | |
3545 | ||
4178ba46 GP |
3546 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3547 | ||
18778a63 GP |
3548 | break; |
3549 | ||
3550 | case L2CAP_SDU_END: | |
3551 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3552 | goto disconnect; | |
3553 | ||
3554 | if (!pi->sdu) | |
3555 | goto disconnect; | |
3556 | ||
1890d36b | 3557 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 3558 | pi->partial_sdu_len += skb->len; |
18778a63 | 3559 | |
1890d36b GP |
3560 | if (pi->partial_sdu_len > pi->imtu) |
3561 | goto drop; | |
18778a63 | 3562 | |
1890d36b GP |
3563 | if (pi->partial_sdu_len != pi->sdu_len) |
3564 | goto drop; | |
4178ba46 GP |
3565 | |
3566 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 3567 | } |
18778a63 GP |
3568 | |
3569 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
3570 | if (!_skb) { |
3571 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
3572 | return -ENOMEM; | |
3573 | } | |
3574 | ||
18778a63 | 3575 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 3576 | if (err < 0) { |
18778a63 | 3577 | kfree_skb(_skb); |
1890d36b GP |
3578 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
3579 | return err; | |
3580 | } | |
3581 | ||
3582 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
3583 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
3584 | |
3585 | kfree_skb(pi->sdu); | |
3586 | break; | |
3587 | } | |
3588 | ||
3589 | kfree_skb(skb); | |
1890d36b | 3590 | return 0; |
18778a63 GP |
3591 | |
3592 | drop: | |
3593 | kfree_skb(pi->sdu); | |
3594 | pi->sdu = NULL; | |
3595 | ||
3596 | disconnect: | |
9b108fc0 | 3597 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
3598 | kfree_skb(skb); |
3599 | return 0; | |
3600 | } | |
3601 | ||
1890d36b GP |
3602 | static void l2cap_busy_work(struct work_struct *work) |
3603 | { | |
3604 | DECLARE_WAITQUEUE(wait, current); | |
3605 | struct l2cap_pinfo *pi = | |
3606 | container_of(work, struct l2cap_pinfo, busy_work); | |
3607 | struct sock *sk = (struct sock *)pi; | |
3608 | int n_tries = 0, timeo = HZ/5, err; | |
3609 | struct sk_buff *skb; | |
3610 | u16 control; | |
3611 | ||
3612 | lock_sock(sk); | |
3613 | ||
2b0b05dd | 3614 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3615 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
3616 | set_current_state(TASK_INTERRUPTIBLE); | |
3617 | ||
3618 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3619 | err = -EBUSY; | |
9b108fc0 | 3620 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
1890d36b GP |
3621 | goto done; |
3622 | } | |
3623 | ||
3624 | if (!timeo) | |
3625 | timeo = HZ/5; | |
3626 | ||
3627 | if (signal_pending(current)) { | |
3628 | err = sock_intr_errno(timeo); | |
3629 | goto done; | |
3630 | } | |
3631 | ||
3632 | release_sock(sk); | |
3633 | timeo = schedule_timeout(timeo); | |
3634 | lock_sock(sk); | |
3635 | ||
3636 | err = sock_error(sk); | |
3637 | if (err) | |
3638 | goto done; | |
3639 | ||
3640 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
3641 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
3642 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3643 | if (err < 0) { | |
3644 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
3645 | break; | |
3646 | } | |
3647 | ||
3648 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3649 | } | |
3650 | ||
3651 | if (!skb) | |
3652 | break; | |
3653 | } | |
3654 | ||
3655 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
3656 | goto done; | |
3657 | ||
3658 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3659 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
3660 | l2cap_send_sframe(pi, control); | |
3661 | l2cap_pi(sk)->retry_count = 1; | |
3662 | ||
3663 | del_timer(&pi->retrans_timer); | |
3664 | __mod_monitor_timer(); | |
3665 | ||
3666 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
3667 | ||
3668 | done: | |
3669 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
3670 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
3671 | ||
0e98958d GP |
3672 | BT_DBG("sk %p, Exit local busy", sk); |
3673 | ||
1890d36b | 3674 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3675 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3676 | |
3677 | release_sock(sk); | |
3678 | } | |
3679 | ||
3680 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
3681 | { | |
3682 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3683 | int sctrl, err; | |
3684 | ||
3685 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3686 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3687 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3688 | return -EBUSY; | |
3689 | } | |
3690 | ||
3691 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3692 | if (err >= 0) { | |
3693 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3694 | return err; | |
3695 | } | |
3696 | ||
3697 | /* Busy Condition */ | |
0e98958d GP |
3698 | BT_DBG("sk %p, Enter local busy", sk); |
3699 | ||
1890d36b GP |
3700 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
3701 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3702 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3703 | ||
3704 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3705 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
3706 | l2cap_send_sframe(pi, sctrl); | |
3707 | ||
3708 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3709 | ||
7fe9b298 GP |
3710 | del_timer(&pi->ack_timer); |
3711 | ||
1890d36b GP |
3712 | queue_work(_busy_wq, &pi->busy_work); |
3713 | ||
3714 | return err; | |
3715 | } | |
3716 | ||
18778a63 | 3717 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3718 | { |
3719 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3720 | struct sk_buff *_skb; | |
3721 | int err = -EINVAL; | |
3722 | ||
18778a63 GP |
3723 | /* |
3724 | * TODO: We have to notify the userland if some data is lost with the | |
3725 | * Streaming Mode. | |
3726 | */ | |
3727 | ||
c74e560c GP |
3728 | switch (control & L2CAP_CTRL_SAR) { |
3729 | case L2CAP_SDU_UNSEGMENTED: | |
3730 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3731 | kfree_skb(pi->sdu); | |
3732 | break; | |
3733 | } | |
3734 | ||
3735 | err = sock_queue_rcv_skb(sk, skb); | |
3736 | if (!err) | |
3737 | return 0; | |
3738 | ||
3739 | break; | |
3740 | ||
3741 | case L2CAP_SDU_START: | |
3742 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3743 | kfree_skb(pi->sdu); | |
3744 | break; | |
3745 | } | |
3746 | ||
3747 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3748 | skb_pull(skb, 2); | |
3749 | ||
052897ca GP |
3750 | if (pi->sdu_len > pi->imtu) { |
3751 | err = -EMSGSIZE; | |
3752 | break; | |
3753 | } | |
3754 | ||
c74e560c GP |
3755 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3756 | if (!pi->sdu) { | |
3757 | err = -ENOMEM; | |
3758 | break; | |
3759 | } | |
3760 | ||
3761 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3762 | ||
3763 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3764 | pi->partial_sdu_len = skb->len; | |
3765 | err = 0; | |
3766 | break; | |
3767 | ||
3768 | case L2CAP_SDU_CONTINUE: | |
3769 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3770 | break; | |
3771 | ||
3772 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3773 | ||
3774 | pi->partial_sdu_len += skb->len; | |
3775 | if (pi->partial_sdu_len > pi->sdu_len) | |
3776 | kfree_skb(pi->sdu); | |
3777 | else | |
3778 | err = 0; | |
3779 | ||
3780 | break; | |
3781 | ||
3782 | case L2CAP_SDU_END: | |
3783 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3784 | break; | |
3785 | ||
3786 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3787 | ||
3788 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3789 | pi->partial_sdu_len += skb->len; | |
3790 | ||
36f2fd58 GP |
3791 | if (pi->partial_sdu_len > pi->imtu) |
3792 | goto drop; | |
3793 | ||
c74e560c GP |
3794 | if (pi->partial_sdu_len == pi->sdu_len) { |
3795 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3796 | err = sock_queue_rcv_skb(sk, _skb); | |
3797 | if (err < 0) | |
3798 | kfree_skb(_skb); | |
3799 | } | |
c74e560c GP |
3800 | err = 0; |
3801 | ||
36f2fd58 GP |
3802 | drop: |
3803 | kfree_skb(pi->sdu); | |
c74e560c GP |
3804 | break; |
3805 | } | |
3806 | ||
3807 | kfree_skb(skb); | |
3808 | return err; | |
3809 | } | |
3810 | ||
8f17154f GP |
3811 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3812 | { | |
3813 | struct sk_buff *skb; | |
afefdbc4 | 3814 | u16 control; |
8f17154f | 3815 | |
59203a21 | 3816 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3817 | if (bt_cb(skb)->tx_seq != tx_seq) |
3818 | break; | |
3819 | ||
3820 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3821 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3822 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3823 | l2cap_pi(sk)->buffer_seq_srej = |
3824 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3825 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3826 | } |
3827 | } | |
3828 | ||
3829 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3830 | { | |
3831 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3832 | struct srej_list *l, *tmp; | |
3833 | u16 control; | |
3834 | ||
59203a21 | 3835 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3836 | if (l->tx_seq == tx_seq) { |
3837 | list_del(&l->list); | |
3838 | kfree(l); | |
3839 | return; | |
3840 | } | |
3841 | control = L2CAP_SUPER_SELECT_REJECT; | |
3842 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3843 | l2cap_send_sframe(pi, control); | |
3844 | list_del(&l->list); | |
3845 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3846 | } | |
3847 | } | |
3848 | ||
3849 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3850 | { | |
3851 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3852 | struct srej_list *new; | |
3853 | u16 control; | |
3854 | ||
3855 | while (tx_seq != pi->expected_tx_seq) { | |
3856 | control = L2CAP_SUPER_SELECT_REJECT; | |
3857 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3858 | l2cap_send_sframe(pi, control); | |
3859 | ||
3860 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3861 | new->tx_seq = pi->expected_tx_seq; |
3862 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3863 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3864 | } | |
8ff50ec0 | 3865 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3866 | } |
3867 | ||
1c2acffb GP |
3868 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3869 | { | |
3870 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3871 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3872 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3873 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3874 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3875 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3876 | int err = 0; |
3877 | ||
0e98958d GP |
3878 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3879 | rx_control); | |
1c2acffb | 3880 | |
9b16dc65 GP |
3881 | if (L2CAP_CTRL_FINAL & rx_control && |
3882 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3883 | del_timer(&pi->monitor_timer); |
3884 | if (pi->unacked_frames > 0) | |
3885 | __mod_retrans_timer(); | |
3886 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3887 | } | |
3888 | ||
9f121a5a GP |
3889 | pi->expected_ack_seq = req_seq; |
3890 | l2cap_drop_acked_frames(sk); | |
3891 | ||
8f17154f GP |
3892 | if (tx_seq == pi->expected_tx_seq) |
3893 | goto expected; | |
1c2acffb | 3894 | |
9b53350d JPRV |
3895 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3896 | if (tx_seq_offset < 0) | |
3897 | tx_seq_offset += 64; | |
3898 | ||
3899 | /* invalid tx_seq */ | |
3900 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3901 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3902 | goto drop; |
3903 | } | |
3904 | ||
1890d36b GP |
3905 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3906 | goto drop; | |
3907 | ||
8f17154f GP |
3908 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3909 | struct srej_list *first; | |
30afb5b2 | 3910 | |
8f17154f GP |
3911 | first = list_first_entry(SREJ_LIST(sk), |
3912 | struct srej_list, list); | |
3913 | if (tx_seq == first->tx_seq) { | |
3914 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3915 | l2cap_check_srej_gap(sk, tx_seq); | |
3916 | ||
3917 | list_del(&first->list); | |
3918 | kfree(first); | |
3919 | ||
3920 | if (list_empty(SREJ_LIST(sk))) { | |
3921 | pi->buffer_seq = pi->buffer_seq_srej; | |
3922 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3923 | l2cap_send_ack(pi); |
0e98958d | 3924 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3925 | } |
3926 | } else { | |
3927 | struct srej_list *l; | |
9b53350d JPRV |
3928 | |
3929 | /* duplicated tx_seq */ | |
3930 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3931 | goto drop; | |
8f17154f GP |
3932 | |
3933 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3934 | if (l->tx_seq == tx_seq) { | |
3935 | l2cap_resend_srejframe(sk, tx_seq); | |
3936 | return 0; | |
3937 | } | |
3938 | } | |
3939 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3940 | } |
3941 | } else { | |
9b53350d JPRV |
3942 | expected_tx_seq_offset = |
3943 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3944 | if (expected_tx_seq_offset < 0) | |
3945 | expected_tx_seq_offset += 64; | |
3946 | ||
3947 | /* duplicated tx_seq */ | |
3948 | if (tx_seq_offset < expected_tx_seq_offset) | |
3949 | goto drop; | |
3950 | ||
8f17154f | 3951 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3952 | |
0e98958d GP |
3953 | BT_DBG("sk %p, Enter SREJ", sk); |
3954 | ||
8f17154f GP |
3955 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3956 | pi->buffer_seq_srej = pi->buffer_seq; | |
3957 | ||
3958 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3959 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3960 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3961 | ||
ef54fd93 GP |
3962 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3963 | ||
8f17154f | 3964 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3965 | |
3966 | del_timer(&pi->ack_timer); | |
1c2acffb | 3967 | } |
30afb5b2 GP |
3968 | return 0; |
3969 | ||
8f17154f GP |
3970 | expected: |
3971 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3972 | ||
3973 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3974 | bt_cb(skb)->tx_seq = tx_seq; |
3975 | bt_cb(skb)->sar = sar; | |
3976 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3977 | return 0; |
3978 | } | |
3979 | ||
2ece3684 GP |
3980 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3981 | if (err < 0) | |
3982 | return 0; | |
3983 | ||
4ec10d97 GP |
3984 | if (rx_control & L2CAP_CTRL_FINAL) { |
3985 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3986 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3987 | else |
3988 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3989 | } |
3990 | ||
c1b4f43b GP |
3991 | __mod_ack_timer(); |
3992 | ||
803020c6 GP |
3993 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3994 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3995 | l2cap_send_ack(pi); |
3996 | ||
8f17154f | 3997 | return 0; |
9b53350d JPRV |
3998 | |
3999 | drop: | |
4000 | kfree_skb(skb); | |
4001 | return 0; | |
1c2acffb GP |
4002 | } |
4003 | ||
e072745f | 4004 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
4005 | { |
4006 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 4007 | |
0e98958d GP |
4008 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
4009 | rx_control); | |
4010 | ||
6e3a5981 GP |
4011 | pi->expected_ack_seq = __get_reqseq(rx_control); |
4012 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 4013 | |
e072745f | 4014 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 4015 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
4016 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
4017 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
4018 | (pi->unacked_frames > 0)) | |
4019 | __mod_retrans_timer(); | |
4020 | ||
4021 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4022 | l2cap_send_srejtail(sk); | |
4023 | } else { | |
4024 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 4025 | } |
1d8f5d16 | 4026 | |
e072745f GP |
4027 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4028 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 4029 | |
e072745f GP |
4030 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
4031 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4032 | else |
4033 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 4034 | |
e072745f | 4035 | } else { |
e072745f GP |
4036 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
4037 | (pi->unacked_frames > 0)) | |
4038 | __mod_retrans_timer(); | |
1c2acffb | 4039 | |
2246b2f1 | 4040 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
dfc909be | 4041 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
e072745f | 4042 | l2cap_send_ack(pi); |
dfc909be GP |
4043 | } else { |
4044 | spin_lock_bh(&pi->send_lock); | |
e072745f | 4045 | l2cap_ertm_send(sk); |
dfc909be GP |
4046 | spin_unlock_bh(&pi->send_lock); |
4047 | } | |
e072745f GP |
4048 | } |
4049 | } | |
2246b2f1 | 4050 | |
e072745f GP |
4051 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
4052 | { | |
4053 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4054 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4055 | |
0e98958d GP |
4056 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4057 | ||
e072745f GP |
4058 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4059 | ||
8abb52ee | 4060 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
4061 | l2cap_drop_acked_frames(sk); |
4062 | ||
4063 | if (rx_control & L2CAP_CTRL_FINAL) { | |
4064 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
4065 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4066 | else |
4067 | l2cap_retransmit_frames(sk); | |
e072745f | 4068 | } else { |
dfc909be | 4069 | l2cap_retransmit_frames(sk); |
30afb5b2 | 4070 | |
0301ef04 | 4071 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 4072 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
4073 | } |
4074 | } | |
4075 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
4076 | { | |
4077 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4078 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4079 | |
0e98958d GP |
4080 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4081 | ||
e072745f | 4082 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 4083 | |
e072745f GP |
4084 | if (rx_control & L2CAP_CTRL_POLL) { |
4085 | pi->expected_ack_seq = tx_seq; | |
4086 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
4087 | |
4088 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
4089 | l2cap_retransmit_one_frame(sk, tx_seq); |
4090 | ||
4091 | spin_lock_bh(&pi->send_lock); | |
e072745f | 4092 | l2cap_ertm_send(sk); |
dfc909be GP |
4093 | spin_unlock_bh(&pi->send_lock); |
4094 | ||
e072745f GP |
4095 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4096 | pi->srej_save_reqseq = tx_seq; | |
4097 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4098 | } |
e072745f GP |
4099 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4100 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
4101 | pi->srej_save_reqseq == tx_seq) | |
4102 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
4103 | else | |
dfc909be | 4104 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 4105 | } else { |
dfc909be | 4106 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
4107 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4108 | pi->srej_save_reqseq = tx_seq; | |
4109 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4110 | } |
e072745f GP |
4111 | } |
4112 | } | |
4113 | ||
4114 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
4115 | { | |
4116 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4117 | u8 tx_seq = __get_reqseq(rx_control); | |
4118 | ||
0e98958d GP |
4119 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4120 | ||
e072745f GP |
4121 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
4122 | pi->expected_ack_seq = tx_seq; | |
4123 | l2cap_drop_acked_frames(sk); | |
4124 | ||
3cb123d1 GP |
4125 | if (rx_control & L2CAP_CTRL_POLL) |
4126 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
4127 | ||
99b0d4b7 GP |
4128 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
4129 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
4130 | if (rx_control & L2CAP_CTRL_POLL) |
4131 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 4132 | return; |
e072745f | 4133 | } |
99b0d4b7 GP |
4134 | |
4135 | if (rx_control & L2CAP_CTRL_POLL) | |
4136 | l2cap_send_srejtail(sk); | |
4137 | else | |
4138 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
4139 | } |
4140 | ||
4141 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
4142 | { | |
4143 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
4144 | ||
9b16dc65 GP |
4145 | if (L2CAP_CTRL_FINAL & rx_control && |
4146 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
4147 | del_timer(&l2cap_pi(sk)->monitor_timer); |
4148 | if (l2cap_pi(sk)->unacked_frames > 0) | |
4149 | __mod_retrans_timer(); | |
4150 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4151 | } | |
4152 | ||
4153 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
4154 | case L2CAP_SUPER_RCV_READY: | |
4155 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
4156 | break; |
4157 | ||
e072745f GP |
4158 | case L2CAP_SUPER_REJECT: |
4159 | l2cap_data_channel_rejframe(sk, rx_control); | |
4160 | break; | |
2246b2f1 | 4161 | |
e072745f GP |
4162 | case L2CAP_SUPER_SELECT_REJECT: |
4163 | l2cap_data_channel_srejframe(sk, rx_control); | |
4164 | break; | |
4165 | ||
4166 | case L2CAP_SUPER_RCV_NOT_READY: | |
4167 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
4168 | break; |
4169 | } | |
4170 | ||
faaebd19 | 4171 | kfree_skb(skb); |
1c2acffb GP |
4172 | return 0; |
4173 | } | |
4174 | ||
1da177e4 LT |
4175 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4176 | { | |
4177 | struct sock *sk; | |
6840ed07 | 4178 | struct l2cap_pinfo *pi; |
51893f88 | 4179 | u16 control; |
f6337c77 | 4180 | u8 tx_seq, req_seq; |
51893f88 | 4181 | int len, next_tx_seq_offset, req_seq_offset; |
1da177e4 LT |
4182 | |
4183 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
4184 | if (!sk) { | |
4185 | BT_DBG("unknown cid 0x%4.4x", cid); | |
4186 | goto drop; | |
4187 | } | |
4188 | ||
6840ed07 GP |
4189 | pi = l2cap_pi(sk); |
4190 | ||
1da177e4 LT |
4191 | BT_DBG("sk %p, len %d", sk, skb->len); |
4192 | ||
4193 | if (sk->sk_state != BT_CONNECTED) | |
4194 | goto drop; | |
4195 | ||
6840ed07 | 4196 | switch (pi->mode) { |
1c2acffb GP |
4197 | case L2CAP_MODE_BASIC: |
4198 | /* If socket recv buffers overflows we drop data here | |
4199 | * which is *bad* because L2CAP has to be reliable. | |
4200 | * But we don't have any other choice. L2CAP doesn't | |
4201 | * provide flow control mechanism. */ | |
1da177e4 | 4202 | |
6840ed07 | 4203 | if (pi->imtu < skb->len) |
1c2acffb | 4204 | goto drop; |
1da177e4 | 4205 | |
1c2acffb GP |
4206 | if (!sock_queue_rcv_skb(sk, skb)) |
4207 | goto done; | |
4208 | break; | |
4209 | ||
4210 | case L2CAP_MODE_ERTM: | |
4211 | control = get_unaligned_le16(skb->data); | |
4212 | skb_pull(skb, 2); | |
c74e560c | 4213 | len = skb->len; |
1c2acffb | 4214 | |
26000089 GP |
4215 | /* |
4216 | * We can just drop the corrupted I-frame here. | |
4217 | * Receiver will miss it and start proper recovery | |
4218 | * procedures and ask retransmission. | |
4219 | */ | |
4220 | if (l2cap_check_fcs(pi, skb)) | |
4221 | goto drop; | |
4222 | ||
bc1b1f8b | 4223 | if (__is_sar_start(control) && __is_iframe(control)) |
c74e560c GP |
4224 | len -= 2; |
4225 | ||
fcc203c3 GP |
4226 | if (pi->fcs == L2CAP_FCS_CRC16) |
4227 | len -= 2; | |
4228 | ||
18778a63 | 4229 | if (len > pi->mps) { |
9b108fc0 | 4230 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
1c2acffb | 4231 | goto drop; |
18778a63 | 4232 | } |
1c2acffb | 4233 | |
01760bdd JPRV |
4234 | req_seq = __get_reqseq(control); |
4235 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
4236 | if (req_seq_offset < 0) | |
4237 | req_seq_offset += 64; | |
4238 | ||
4239 | next_tx_seq_offset = | |
4240 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
4241 | if (next_tx_seq_offset < 0) | |
4242 | next_tx_seq_offset += 64; | |
4243 | ||
4244 | /* check for invalid req-seq */ | |
4245 | if (req_seq_offset > next_tx_seq_offset) { | |
9b108fc0 | 4246 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
01760bdd JPRV |
4247 | goto drop; |
4248 | } | |
4249 | ||
277ffbe3 | 4250 | if (__is_iframe(control)) { |
51893f88 | 4251 | if (len < 0) { |
9b108fc0 | 4252 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
277ffbe3 | 4253 | goto drop; |
18778a63 | 4254 | } |
277ffbe3 | 4255 | |
fcafde2e | 4256 | l2cap_data_channel_iframe(sk, control, skb); |
277ffbe3 | 4257 | } else { |
18778a63 | 4258 | if (len != 0) { |
9b108fc0 | 4259 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
277ffbe3 | 4260 | goto drop; |
18778a63 | 4261 | } |
277ffbe3 | 4262 | |
fcafde2e | 4263 | l2cap_data_channel_sframe(sk, control, skb); |
277ffbe3 | 4264 | } |
1c2acffb | 4265 | |
fcafde2e | 4266 | goto done; |
1c2acffb | 4267 | |
6840ed07 GP |
4268 | case L2CAP_MODE_STREAMING: |
4269 | control = get_unaligned_le16(skb->data); | |
4270 | skb_pull(skb, 2); | |
4271 | len = skb->len; | |
4272 | ||
26000089 GP |
4273 | if (l2cap_check_fcs(pi, skb)) |
4274 | goto drop; | |
4275 | ||
6840ed07 GP |
4276 | if (__is_sar_start(control)) |
4277 | len -= 2; | |
4278 | ||
fcc203c3 GP |
4279 | if (pi->fcs == L2CAP_FCS_CRC16) |
4280 | len -= 2; | |
4281 | ||
51893f88 | 4282 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
4283 | goto drop; |
4284 | ||
4285 | tx_seq = __get_txseq(control); | |
4286 | ||
4287 | if (pi->expected_tx_seq == tx_seq) | |
4288 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4289 | else | |
7dffe421 | 4290 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 4291 | |
18778a63 | 4292 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
4293 | |
4294 | goto done; | |
4295 | ||
1c2acffb | 4296 | default: |
e8235c6b | 4297 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
4298 | break; |
4299 | } | |
1da177e4 LT |
4300 | |
4301 | drop: | |
4302 | kfree_skb(skb); | |
4303 | ||
4304 | done: | |
0139418c MH |
4305 | if (sk) |
4306 | bh_unlock_sock(sk); | |
4307 | ||
1da177e4 LT |
4308 | return 0; |
4309 | } | |
4310 | ||
8e036fc3 | 4311 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
4312 | { |
4313 | struct sock *sk; | |
4314 | ||
4315 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
4316 | if (!sk) | |
4317 | goto drop; | |
4318 | ||
4319 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4320 | ||
4321 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
4322 | goto drop; | |
4323 | ||
4324 | if (l2cap_pi(sk)->imtu < skb->len) | |
4325 | goto drop; | |
4326 | ||
4327 | if (!sock_queue_rcv_skb(sk, skb)) | |
4328 | goto done; | |
4329 | ||
4330 | drop: | |
4331 | kfree_skb(skb); | |
4332 | ||
4333 | done: | |
af05b30b GP |
4334 | if (sk) |
4335 | bh_unlock_sock(sk); | |
1da177e4 LT |
4336 | return 0; |
4337 | } | |
4338 | ||
4339 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
4340 | { | |
4341 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4342 | u16 cid, len; |
4343 | __le16 psm; | |
1da177e4 LT |
4344 | |
4345 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4346 | cid = __le16_to_cpu(lh->cid); | |
4347 | len = __le16_to_cpu(lh->len); | |
4348 | ||
1c2acffb GP |
4349 | if (len != skb->len) { |
4350 | kfree_skb(skb); | |
4351 | return; | |
4352 | } | |
4353 | ||
1da177e4 LT |
4354 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4355 | ||
4356 | switch (cid) { | |
8db4dc46 | 4357 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4358 | l2cap_sig_channel(conn, skb); |
4359 | break; | |
4360 | ||
8db4dc46 | 4361 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4362 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4363 | skb_pull(skb, 2); |
4364 | l2cap_conless_channel(conn, psm, skb); | |
4365 | break; | |
4366 | ||
4367 | default: | |
4368 | l2cap_data_channel(conn, cid, skb); | |
4369 | break; | |
4370 | } | |
4371 | } | |
4372 | ||
4373 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4374 | ||
4375 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4376 | { | |
4377 | int exact = 0, lm1 = 0, lm2 = 0; | |
4378 | register struct sock *sk; | |
4379 | struct hlist_node *node; | |
4380 | ||
4381 | if (type != ACL_LINK) | |
4382 | return 0; | |
4383 | ||
4384 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4385 | ||
4386 | /* Find listening sockets and check their link_mode */ | |
4387 | read_lock(&l2cap_sk_list.lock); | |
4388 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4389 | if (sk->sk_state != BT_LISTEN) | |
4390 | continue; | |
4391 | ||
4392 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
4393 | lm1 |= HCI_LM_ACCEPT; |
4394 | if (l2cap_pi(sk)->role_switch) | |
4395 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 4396 | exact++; |
2af6b9d5 MH |
4397 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4398 | lm2 |= HCI_LM_ACCEPT; | |
4399 | if (l2cap_pi(sk)->role_switch) | |
4400 | lm2 |= HCI_LM_MASTER; | |
4401 | } | |
1da177e4 LT |
4402 | } |
4403 | read_unlock(&l2cap_sk_list.lock); | |
4404 | ||
4405 | return exact ? lm1 : lm2; | |
4406 | } | |
4407 | ||
4408 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4409 | { | |
0139418c MH |
4410 | struct l2cap_conn *conn; |
4411 | ||
1da177e4 LT |
4412 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4413 | ||
4414 | if (hcon->type != ACL_LINK) | |
4415 | return 0; | |
4416 | ||
4417 | if (!status) { | |
1da177e4 LT |
4418 | conn = l2cap_conn_add(hcon, status); |
4419 | if (conn) | |
4420 | l2cap_conn_ready(conn); | |
0139418c | 4421 | } else |
1da177e4 LT |
4422 | l2cap_conn_del(hcon, bt_err(status)); |
4423 | ||
4424 | return 0; | |
4425 | } | |
4426 | ||
2950f21a MH |
4427 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4428 | { | |
4429 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4430 | ||
4431 | BT_DBG("hcon %p", hcon); | |
4432 | ||
4433 | if (hcon->type != ACL_LINK || !conn) | |
4434 | return 0x13; | |
4435 | ||
4436 | return conn->disc_reason; | |
4437 | } | |
4438 | ||
4439 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4440 | { |
4441 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4442 | ||
4443 | if (hcon->type != ACL_LINK) | |
4444 | return 0; | |
4445 | ||
4446 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4447 | |
1da177e4 LT |
4448 | return 0; |
4449 | } | |
4450 | ||
f62e4323 MH |
4451 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4452 | { | |
bd3c9e25 | 4453 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4454 | return; |
4455 | ||
f62e4323 MH |
4456 | if (encrypt == 0x00) { |
4457 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4458 | l2cap_sock_clear_timer(sk); | |
4459 | l2cap_sock_set_timer(sk, HZ * 5); | |
4460 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4461 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4462 | } else { | |
4463 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4464 | l2cap_sock_clear_timer(sk); | |
4465 | } | |
4466 | } | |
4467 | ||
8c1b2355 | 4468 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4469 | { |
4470 | struct l2cap_chan_list *l; | |
0139418c | 4471 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4472 | struct sock *sk; |
1da177e4 | 4473 | |
0139418c | 4474 | if (!conn) |
1da177e4 | 4475 | return 0; |
0139418c | 4476 | |
1da177e4 LT |
4477 | l = &conn->chan_list; |
4478 | ||
4479 | BT_DBG("conn %p", conn); | |
4480 | ||
4481 | read_lock(&l->lock); | |
4482 | ||
4483 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4484 | bh_lock_sock(sk); | |
4485 | ||
6a8d3010 MH |
4486 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4487 | bh_unlock_sock(sk); | |
4488 | continue; | |
4489 | } | |
4490 | ||
f62e4323 | 4491 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4492 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4493 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4494 | bh_unlock_sock(sk); |
4495 | continue; | |
4496 | } | |
4497 | ||
b1235d79 MH |
4498 | if (sk->sk_state == BT_CONNECT) { |
4499 | if (!status) { | |
4500 | struct l2cap_conn_req req; | |
4501 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4502 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4503 | |
b1235d79 | 4504 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 4505 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 4506 | |
b1235d79 MH |
4507 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4508 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4509 | } else { | |
4510 | l2cap_sock_clear_timer(sk); | |
4511 | l2cap_sock_set_timer(sk, HZ / 10); | |
4512 | } | |
4513 | } else if (sk->sk_state == BT_CONNECT2) { | |
4514 | struct l2cap_conn_rsp rsp; | |
4515 | __u16 result; | |
1da177e4 | 4516 | |
b1235d79 MH |
4517 | if (!status) { |
4518 | sk->sk_state = BT_CONFIG; | |
4519 | result = L2CAP_CR_SUCCESS; | |
4520 | } else { | |
4521 | sk->sk_state = BT_DISCONN; | |
4522 | l2cap_sock_set_timer(sk, HZ / 10); | |
4523 | result = L2CAP_CR_SEC_BLOCK; | |
4524 | } | |
4525 | ||
4526 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4527 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4528 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4529 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4530 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4531 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4532 | } | |
1da177e4 LT |
4533 | |
4534 | bh_unlock_sock(sk); | |
4535 | } | |
4536 | ||
4537 | read_unlock(&l->lock); | |
b1235d79 | 4538 | |
1da177e4 LT |
4539 | return 0; |
4540 | } | |
4541 | ||
4542 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4543 | { | |
4544 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4545 | ||
4546 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4547 | goto drop; | |
4548 | ||
4549 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4550 | ||
4551 | if (flags & ACL_START) { | |
4552 | struct l2cap_hdr *hdr; | |
4553 | int len; | |
4554 | ||
4555 | if (conn->rx_len) { | |
4556 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4557 | kfree_skb(conn->rx_skb); | |
4558 | conn->rx_skb = NULL; | |
4559 | conn->rx_len = 0; | |
4560 | l2cap_conn_unreliable(conn, ECOMM); | |
4561 | } | |
4562 | ||
4563 | if (skb->len < 2) { | |
4564 | BT_ERR("Frame is too short (len %d)", skb->len); | |
4565 | l2cap_conn_unreliable(conn, ECOMM); | |
4566 | goto drop; | |
4567 | } | |
4568 | ||
4569 | hdr = (struct l2cap_hdr *) skb->data; | |
4570 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4571 | ||
4572 | if (len == skb->len) { | |
4573 | /* Complete frame received */ | |
4574 | l2cap_recv_frame(conn, skb); | |
4575 | return 0; | |
4576 | } | |
4577 | ||
4578 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4579 | ||
4580 | if (skb->len > len) { | |
4581 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4582 | skb->len, len); | |
4583 | l2cap_conn_unreliable(conn, ECOMM); | |
4584 | goto drop; | |
4585 | } | |
4586 | ||
4587 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4588 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4589 | if (!conn->rx_skb) | |
1da177e4 LT |
4590 | goto drop; |
4591 | ||
d626f62b | 4592 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4593 | skb->len); |
1da177e4 LT |
4594 | conn->rx_len = len - skb->len; |
4595 | } else { | |
4596 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4597 | ||
4598 | if (!conn->rx_len) { | |
4599 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4600 | l2cap_conn_unreliable(conn, ECOMM); | |
4601 | goto drop; | |
4602 | } | |
4603 | ||
4604 | if (skb->len > conn->rx_len) { | |
4605 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4606 | skb->len, conn->rx_len); | |
4607 | kfree_skb(conn->rx_skb); | |
4608 | conn->rx_skb = NULL; | |
4609 | conn->rx_len = 0; | |
4610 | l2cap_conn_unreliable(conn, ECOMM); | |
4611 | goto drop; | |
4612 | } | |
4613 | ||
d626f62b | 4614 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4615 | skb->len); |
1da177e4 LT |
4616 | conn->rx_len -= skb->len; |
4617 | ||
4618 | if (!conn->rx_len) { | |
4619 | /* Complete frame received */ | |
4620 | l2cap_recv_frame(conn, conn->rx_skb); | |
4621 | conn->rx_skb = NULL; | |
4622 | } | |
4623 | } | |
4624 | ||
4625 | drop: | |
4626 | kfree_skb(skb); | |
4627 | return 0; | |
4628 | } | |
4629 | ||
aef7d97c | 4630 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4631 | { |
4632 | struct sock *sk; | |
4633 | struct hlist_node *node; | |
1da177e4 LT |
4634 | |
4635 | read_lock_bh(&l2cap_sk_list.lock); | |
4636 | ||
be9d1227 MH |
4637 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4638 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4639 | |
aef7d97c MH |
4640 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4641 | batostr(&bt_sk(sk)->src), | |
4642 | batostr(&bt_sk(sk)->dst), | |
4643 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4644 | pi->scid, pi->dcid, | |
4645 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4646 | } |
1da177e4 | 4647 | |
1da177e4 | 4648 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4649 | |
aef7d97c | 4650 | return 0; |
1da177e4 LT |
4651 | } |
4652 | ||
aef7d97c MH |
4653 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4654 | { | |
4655 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4656 | } | |
4657 | ||
4658 | static const struct file_operations l2cap_debugfs_fops = { | |
4659 | .open = l2cap_debugfs_open, | |
4660 | .read = seq_read, | |
4661 | .llseek = seq_lseek, | |
4662 | .release = single_release, | |
4663 | }; | |
4664 | ||
4665 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4666 | |
90ddc4f0 | 4667 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4668 | .family = PF_BLUETOOTH, |
4669 | .owner = THIS_MODULE, | |
4670 | .release = l2cap_sock_release, | |
4671 | .bind = l2cap_sock_bind, | |
4672 | .connect = l2cap_sock_connect, | |
4673 | .listen = l2cap_sock_listen, | |
4674 | .accept = l2cap_sock_accept, | |
4675 | .getname = l2cap_sock_getname, | |
4676 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4677 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4678 | .poll = bt_sock_poll, |
3241ad82 | 4679 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4680 | .mmap = sock_no_mmap, |
4681 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4682 | .shutdown = l2cap_sock_shutdown, |
4683 | .setsockopt = l2cap_sock_setsockopt, | |
4684 | .getsockopt = l2cap_sock_getsockopt | |
4685 | }; | |
4686 | ||
ec1b4cf7 | 4687 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4688 | .family = PF_BLUETOOTH, |
4689 | .owner = THIS_MODULE, | |
4690 | .create = l2cap_sock_create, | |
4691 | }; | |
4692 | ||
4693 | static struct hci_proto l2cap_hci_proto = { | |
4694 | .name = "L2CAP", | |
4695 | .id = HCI_PROTO_L2CAP, | |
4696 | .connect_ind = l2cap_connect_ind, | |
4697 | .connect_cfm = l2cap_connect_cfm, | |
4698 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4699 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4700 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4701 | .recv_acldata = l2cap_recv_acldata |
4702 | }; | |
4703 | ||
4704 | static int __init l2cap_init(void) | |
4705 | { | |
4706 | int err; | |
be9d1227 | 4707 | |
1da177e4 LT |
4708 | err = proto_register(&l2cap_proto, 0); |
4709 | if (err < 0) | |
4710 | return err; | |
4711 | ||
1890d36b GP |
4712 | _busy_wq = create_singlethread_workqueue("l2cap"); |
4713 | if (!_busy_wq) | |
4714 | goto error; | |
4715 | ||
1da177e4 LT |
4716 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); |
4717 | if (err < 0) { | |
4718 | BT_ERR("L2CAP socket registration failed"); | |
4719 | goto error; | |
4720 | } | |
4721 | ||
4722 | err = hci_register_proto(&l2cap_hci_proto); | |
4723 | if (err < 0) { | |
4724 | BT_ERR("L2CAP protocol registration failed"); | |
4725 | bt_sock_unregister(BTPROTO_L2CAP); | |
4726 | goto error; | |
4727 | } | |
4728 | ||
aef7d97c MH |
4729 | if (bt_debugfs) { |
4730 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4731 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4732 | if (!l2cap_debugfs) | |
4733 | BT_ERR("Failed to create L2CAP debug file"); | |
4734 | } | |
1da177e4 LT |
4735 | |
4736 | BT_INFO("L2CAP ver %s", VERSION); | |
4737 | BT_INFO("L2CAP socket layer initialized"); | |
4738 | ||
4739 | return 0; | |
4740 | ||
4741 | error: | |
4742 | proto_unregister(&l2cap_proto); | |
4743 | return err; | |
4744 | } | |
4745 | ||
4746 | static void __exit l2cap_exit(void) | |
4747 | { | |
aef7d97c | 4748 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4749 | |
1890d36b GP |
4750 | flush_workqueue(_busy_wq); |
4751 | destroy_workqueue(_busy_wq); | |
4752 | ||
1da177e4 LT |
4753 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) |
4754 | BT_ERR("L2CAP socket unregistration failed"); | |
4755 | ||
4756 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4757 | BT_ERR("L2CAP protocol unregistration failed"); | |
4758 | ||
4759 | proto_unregister(&l2cap_proto); | |
4760 | } | |
4761 | ||
4762 | void l2cap_load(void) | |
4763 | { | |
4764 | /* Dummy function to trigger automatic L2CAP module loading by | |
4765 | * other modules that use L2CAP sockets but don't use any other | |
4766 | * symbols from it. */ | |
1da177e4 LT |
4767 | } |
4768 | EXPORT_SYMBOL(l2cap_load); | |
4769 | ||
4770 | module_init(l2cap_init); | |
4771 | module_exit(l2cap_exit); | |
4772 | ||
44dd46de MH |
4773 | module_param(enable_ertm, bool, 0644); |
4774 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
4775 | ||
63fbd24e | 4776 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4777 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4778 | MODULE_VERSION(VERSION); | |
4779 | MODULE_LICENSE("GPL"); | |
4780 | MODULE_ALIAS("bt-proto-0"); |