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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 | ||
cf6c2c0b GP |
459 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
460 | { | |
461 | u32 local_feat_mask = l2cap_feat_mask; | |
462 | if (enable_ertm) | |
463 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; | |
464 | ||
465 | switch (mode) { | |
466 | case L2CAP_MODE_ERTM: | |
467 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
468 | case L2CAP_MODE_STREAMING: | |
469 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
470 | default: | |
471 | return 0x00; | |
472 | } | |
473 | } | |
474 | ||
9b108fc0 | 475 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
476 | { |
477 | struct l2cap_disconn_req req; | |
478 | ||
c13ffa62 GP |
479 | if (!conn) |
480 | return; | |
481 | ||
482 | skb_queue_purge(TX_QUEUE(sk)); | |
483 | ||
484 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
485 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
486 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
487 | del_timer(&l2cap_pi(sk)->ack_timer); | |
488 | } | |
489 | ||
22121fc9 GP |
490 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
491 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
492 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
493 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
494 | |
495 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 496 | sk->sk_err = err; |
22121fc9 GP |
497 | } |
498 | ||
1da177e4 | 499 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
500 | static void l2cap_conn_start(struct l2cap_conn *conn) |
501 | { | |
502 | struct l2cap_chan_list *l = &conn->chan_list; | |
cf6c2c0b | 503 | struct sock_del_list del, *tmp1, *tmp2; |
4e8402a3 MH |
504 | struct sock *sk; |
505 | ||
506 | BT_DBG("conn %p", conn); | |
507 | ||
cf6c2c0b GP |
508 | INIT_LIST_HEAD(&del.list); |
509 | ||
4e8402a3 MH |
510 | read_lock(&l->lock); |
511 | ||
512 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
513 | bh_lock_sock(sk); | |
514 | ||
bd3c9e25 GP |
515 | if (sk->sk_type != SOCK_SEQPACKET && |
516 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
517 | bh_unlock_sock(sk); |
518 | continue; | |
519 | } | |
520 | ||
521 | if (sk->sk_state == BT_CONNECT) { | |
e501d055 AE |
522 | if (l2cap_check_security(sk) && |
523 | __l2cap_no_conn_pending(sk)) { | |
b1235d79 | 524 | struct l2cap_conn_req req; |
cf6c2c0b GP |
525 | |
526 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, | |
527 | conn->feat_mask) | |
528 | && l2cap_pi(sk)->conf_state & | |
529 | L2CAP_CONF_STATE2_DEVICE) { | |
530 | tmp1 = kzalloc(sizeof(struct srej_list), | |
531 | GFP_ATOMIC); | |
532 | tmp1->sk = sk; | |
533 | list_add_tail(&tmp1->list, &del.list); | |
534 | bh_unlock_sock(sk); | |
535 | continue; | |
536 | } | |
537 | ||
b1235d79 MH |
538 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); |
539 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 540 | |
b1235d79 | 541 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 542 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 543 | |
b1235d79 | 544 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 545 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 546 | } |
79d554a6 MH |
547 | } else if (sk->sk_state == BT_CONNECT2) { |
548 | struct l2cap_conn_rsp rsp; | |
549 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
550 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
551 | ||
2af6b9d5 | 552 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
553 | if (bt_sk(sk)->defer_setup) { |
554 | struct sock *parent = bt_sk(sk)->parent; | |
555 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
556 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
557 | parent->sk_data_ready(parent, 0); | |
558 | ||
559 | } else { | |
560 | sk->sk_state = BT_CONFIG; | |
561 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
562 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
563 | } | |
79d554a6 MH |
564 | } else { |
565 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
566 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
567 | } | |
568 | ||
569 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
570 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
571 | } |
572 | ||
573 | bh_unlock_sock(sk); | |
574 | } | |
575 | ||
576 | read_unlock(&l->lock); | |
cf6c2c0b GP |
577 | |
578 | list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { | |
579 | bh_lock_sock(tmp1->sk); | |
580 | __l2cap_sock_close(tmp1->sk, ECONNRESET); | |
581 | bh_unlock_sock(tmp1->sk); | |
582 | list_del(&tmp1->list); | |
583 | kfree(tmp1); | |
584 | } | |
4e8402a3 MH |
585 | } |
586 | ||
587 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
588 | { | |
79d554a6 MH |
589 | struct l2cap_chan_list *l = &conn->chan_list; |
590 | struct sock *sk; | |
4e8402a3 | 591 | |
79d554a6 | 592 | BT_DBG("conn %p", conn); |
4e8402a3 | 593 | |
79d554a6 | 594 | read_lock(&l->lock); |
4e8402a3 | 595 | |
79d554a6 MH |
596 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
597 | bh_lock_sock(sk); | |
4e8402a3 | 598 | |
bd3c9e25 GP |
599 | if (sk->sk_type != SOCK_SEQPACKET && |
600 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
601 | l2cap_sock_clear_timer(sk); |
602 | sk->sk_state = BT_CONNECTED; | |
603 | sk->sk_state_change(sk); | |
604 | } else if (sk->sk_state == BT_CONNECT) | |
605 | l2cap_do_start(sk); | |
4e8402a3 | 606 | |
79d554a6 | 607 | bh_unlock_sock(sk); |
4e8402a3 | 608 | } |
79d554a6 MH |
609 | |
610 | read_unlock(&l->lock); | |
4e8402a3 MH |
611 | } |
612 | ||
613 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
614 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
615 | { | |
616 | struct l2cap_chan_list *l = &conn->chan_list; | |
617 | struct sock *sk; | |
618 | ||
619 | BT_DBG("conn %p", conn); | |
620 | ||
621 | read_lock(&l->lock); | |
622 | ||
623 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 624 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
625 | sk->sk_err = err; |
626 | } | |
627 | ||
628 | read_unlock(&l->lock); | |
629 | } | |
630 | ||
631 | static void l2cap_info_timeout(unsigned long arg) | |
632 | { | |
633 | struct l2cap_conn *conn = (void *) arg; | |
634 | ||
984947dc | 635 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 636 | conn->info_ident = 0; |
984947dc | 637 | |
4e8402a3 MH |
638 | l2cap_conn_start(conn); |
639 | } | |
640 | ||
1da177e4 LT |
641 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
642 | { | |
0139418c | 643 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 644 | |
0139418c | 645 | if (conn || status) |
1da177e4 LT |
646 | return conn; |
647 | ||
0139418c MH |
648 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
649 | if (!conn) | |
1da177e4 | 650 | return NULL; |
1da177e4 LT |
651 | |
652 | hcon->l2cap_data = conn; | |
653 | conn->hcon = hcon; | |
654 | ||
0139418c MH |
655 | BT_DBG("hcon %p conn %p", hcon, conn); |
656 | ||
1da177e4 LT |
657 | conn->mtu = hcon->hdev->acl_mtu; |
658 | conn->src = &hcon->hdev->bdaddr; | |
659 | conn->dst = &hcon->dst; | |
660 | ||
4e8402a3 MH |
661 | conn->feat_mask = 0; |
662 | ||
1da177e4 LT |
663 | spin_lock_init(&conn->lock); |
664 | rwlock_init(&conn->chan_list.lock); | |
665 | ||
45054dc1 DY |
666 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
667 | (unsigned long) conn); | |
668 | ||
2950f21a MH |
669 | conn->disc_reason = 0x13; |
670 | ||
1da177e4 LT |
671 | return conn; |
672 | } | |
673 | ||
0139418c | 674 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 675 | { |
0139418c | 676 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
677 | struct sock *sk; |
678 | ||
0139418c MH |
679 | if (!conn) |
680 | return; | |
1da177e4 LT |
681 | |
682 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
683 | ||
7585b97a | 684 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
685 | |
686 | /* Kill channels */ | |
687 | while ((sk = conn->chan_list.head)) { | |
688 | bh_lock_sock(sk); | |
689 | l2cap_chan_del(sk, err); | |
690 | bh_unlock_sock(sk); | |
691 | l2cap_sock_kill(sk); | |
692 | } | |
693 | ||
8e8440f5 DY |
694 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
695 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 696 | |
1da177e4 LT |
697 | hcon->l2cap_data = NULL; |
698 | kfree(conn); | |
1da177e4 LT |
699 | } |
700 | ||
701 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
702 | { | |
703 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 704 | write_lock_bh(&l->lock); |
1da177e4 | 705 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 706 | write_unlock_bh(&l->lock); |
1da177e4 LT |
707 | } |
708 | ||
1da177e4 | 709 | /* ---- Socket interface ---- */ |
8e036fc3 | 710 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
711 | { |
712 | struct sock *sk; | |
713 | struct hlist_node *node; | |
714 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
715 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
716 | goto found; | |
717 | sk = NULL; | |
718 | found: | |
719 | return sk; | |
720 | } | |
721 | ||
722 | /* Find socket with psm and source bdaddr. | |
723 | * Returns closest match. | |
724 | */ | |
8e036fc3 | 725 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
726 | { |
727 | struct sock *sk = NULL, *sk1 = NULL; | |
728 | struct hlist_node *node; | |
729 | ||
730 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
731 | if (state && sk->sk_state != state) | |
732 | continue; | |
733 | ||
734 | if (l2cap_pi(sk)->psm == psm) { | |
735 | /* Exact match. */ | |
736 | if (!bacmp(&bt_sk(sk)->src, src)) | |
737 | break; | |
738 | ||
739 | /* Closest match */ | |
740 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
741 | sk1 = sk; | |
742 | } | |
743 | } | |
744 | return node ? sk : sk1; | |
745 | } | |
746 | ||
747 | /* Find socket with given address (psm, src). | |
748 | * Returns locked socket */ | |
8e036fc3 | 749 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
750 | { |
751 | struct sock *s; | |
752 | read_lock(&l2cap_sk_list.lock); | |
753 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
754 | if (s) |
755 | bh_lock_sock(s); | |
1da177e4 LT |
756 | read_unlock(&l2cap_sk_list.lock); |
757 | return s; | |
758 | } | |
759 | ||
760 | static void l2cap_sock_destruct(struct sock *sk) | |
761 | { | |
762 | BT_DBG("sk %p", sk); | |
763 | ||
764 | skb_queue_purge(&sk->sk_receive_queue); | |
765 | skb_queue_purge(&sk->sk_write_queue); | |
766 | } | |
767 | ||
768 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
769 | { | |
770 | struct sock *sk; | |
771 | ||
772 | BT_DBG("parent %p", parent); | |
773 | ||
774 | /* Close not yet accepted channels */ | |
775 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
776 | l2cap_sock_close(sk); | |
777 | ||
b1235d79 | 778 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
779 | sock_set_flag(parent, SOCK_ZAPPED); |
780 | } | |
781 | ||
782 | /* Kill socket (only if zapped and orphan) | |
783 | * Must be called on unlocked socket. | |
784 | */ | |
785 | static void l2cap_sock_kill(struct sock *sk) | |
786 | { | |
787 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
788 | return; | |
789 | ||
790 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
791 | ||
792 | /* Kill poor orphan */ | |
793 | bt_sock_unlink(&l2cap_sk_list, sk); | |
794 | sock_set_flag(sk, SOCK_DEAD); | |
795 | sock_put(sk); | |
796 | } | |
797 | ||
798 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
799 | { | |
800 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
801 | ||
802 | switch (sk->sk_state) { | |
803 | case BT_LISTEN: | |
804 | l2cap_sock_cleanup_listen(sk); | |
805 | break; | |
806 | ||
807 | case BT_CONNECTED: | |
808 | case BT_CONFIG: | |
bd3c9e25 GP |
809 | if (sk->sk_type == SOCK_SEQPACKET || |
810 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 811 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 | 812 | |
1da177e4 | 813 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
9b108fc0 | 814 | l2cap_send_disconn_req(conn, sk, reason); |
b1235d79 | 815 | } else |
1da177e4 | 816 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
817 | break; |
818 | ||
f66dc81f | 819 | case BT_CONNECT2: |
bd3c9e25 GP |
820 | if (sk->sk_type == SOCK_SEQPACKET || |
821 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
822 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
823 | struct l2cap_conn_rsp rsp; | |
824 | __u16 result; | |
825 | ||
826 | if (bt_sk(sk)->defer_setup) | |
827 | result = L2CAP_CR_SEC_BLOCK; | |
828 | else | |
829 | result = L2CAP_CR_BAD_PSM; | |
830 | ||
831 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
832 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
833 | rsp.result = cpu_to_le16(result); | |
834 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
835 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
836 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
837 | } else | |
838 | l2cap_chan_del(sk, reason); | |
839 | break; | |
840 | ||
1da177e4 LT |
841 | case BT_CONNECT: |
842 | case BT_DISCONN: | |
843 | l2cap_chan_del(sk, reason); | |
844 | break; | |
845 | ||
846 | default: | |
847 | sock_set_flag(sk, SOCK_ZAPPED); | |
848 | break; | |
849 | } | |
850 | } | |
851 | ||
852 | /* Must be called on unlocked socket. */ | |
853 | static void l2cap_sock_close(struct sock *sk) | |
854 | { | |
855 | l2cap_sock_clear_timer(sk); | |
856 | lock_sock(sk); | |
857 | __l2cap_sock_close(sk, ECONNRESET); | |
858 | release_sock(sk); | |
859 | l2cap_sock_kill(sk); | |
860 | } | |
861 | ||
862 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
863 | { | |
864 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
865 | ||
866 | BT_DBG("sk %p", sk); | |
867 | ||
868 | if (parent) { | |
869 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
870 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
871 | ||
1da177e4 LT |
872 | pi->imtu = l2cap_pi(parent)->imtu; |
873 | pi->omtu = l2cap_pi(parent)->omtu; | |
85eb53c6 | 874 | pi->conf_state = l2cap_pi(parent)->conf_state; |
c6b03cf9 MH |
875 | pi->mode = l2cap_pi(parent)->mode; |
876 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 877 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 878 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
879 | pi->sec_level = l2cap_pi(parent)->sec_level; |
880 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
881 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
882 | } else { |
883 | pi->imtu = L2CAP_DEFAULT_MTU; | |
884 | pi->omtu = 0; | |
85eb53c6 | 885 | if (enable_ertm && sk->sk_type == SOCK_STREAM) { |
bd3c9e25 | 886 | pi->mode = L2CAP_MODE_ERTM; |
85eb53c6 GP |
887 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
888 | } else { | |
bd3c9e25 | 889 | pi->mode = L2CAP_MODE_BASIC; |
85eb53c6 | 890 | } |
fd059b9b | 891 | pi->max_tx = L2CAP_DEFAULT_MAX_TX; |
c6b03cf9 | 892 | pi->fcs = L2CAP_FCS_CRC16; |
fd059b9b | 893 | pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; |
2af6b9d5 MH |
894 | pi->sec_level = BT_SECURITY_LOW; |
895 | pi->role_switch = 0; | |
896 | pi->force_reliable = 0; | |
1da177e4 LT |
897 | } |
898 | ||
899 | /* Default config options */ | |
5dee9e7c | 900 | pi->conf_len = 0; |
1da177e4 | 901 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
902 | skb_queue_head_init(TX_QUEUE(sk)); |
903 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 904 | skb_queue_head_init(BUSY_QUEUE(sk)); |
45054dc1 | 905 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
1da177e4 LT |
906 | } |
907 | ||
908 | static struct proto l2cap_proto = { | |
909 | .name = "L2CAP", | |
910 | .owner = THIS_MODULE, | |
911 | .obj_size = sizeof(struct l2cap_pinfo) | |
912 | }; | |
913 | ||
1b8d7ae4 | 914 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
915 | { |
916 | struct sock *sk; | |
917 | ||
6257ff21 | 918 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
919 | if (!sk) |
920 | return NULL; | |
921 | ||
922 | sock_init_data(sock, sk); | |
923 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
924 | ||
925 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 926 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
927 | |
928 | sock_reset_flag(sk, SOCK_ZAPPED); | |
929 | ||
930 | sk->sk_protocol = proto; | |
b1235d79 | 931 | sk->sk_state = BT_OPEN; |
1da177e4 | 932 | |
b1235d79 | 933 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
934 | |
935 | bt_sock_link(&l2cap_sk_list, sk); | |
936 | return sk; | |
937 | } | |
938 | ||
3f378b68 EP |
939 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
940 | int kern) | |
1da177e4 LT |
941 | { |
942 | struct sock *sk; | |
943 | ||
944 | BT_DBG("sock %p", sock); | |
945 | ||
946 | sock->state = SS_UNCONNECTED; | |
947 | ||
bd3c9e25 | 948 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
949 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
950 | return -ESOCKTNOSUPPORT; | |
951 | ||
c84b3268 | 952 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
953 | return -EPERM; |
954 | ||
955 | sock->ops = &l2cap_sock_ops; | |
956 | ||
1b8d7ae4 | 957 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
958 | if (!sk) |
959 | return -ENOMEM; | |
960 | ||
961 | l2cap_sock_init(sk, NULL); | |
962 | return 0; | |
963 | } | |
964 | ||
f29972de | 965 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 966 | { |
1da177e4 | 967 | struct sock *sk = sock->sk; |
f29972de MH |
968 | struct sockaddr_l2 la; |
969 | int len, err = 0; | |
1da177e4 | 970 | |
f29972de | 971 | BT_DBG("sk %p", sk); |
1da177e4 LT |
972 | |
973 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
974 | return -EINVAL; | |
975 | ||
f29972de MH |
976 | memset(&la, 0, sizeof(la)); |
977 | len = min_t(unsigned int, sizeof(la), alen); | |
978 | memcpy(&la, addr, len); | |
979 | ||
2a517ca6 MH |
980 | if (la.l2_cid) |
981 | return -EINVAL; | |
982 | ||
1da177e4 LT |
983 | lock_sock(sk); |
984 | ||
985 | if (sk->sk_state != BT_OPEN) { | |
986 | err = -EBADFD; | |
987 | goto done; | |
988 | } | |
989 | ||
b4324b5d | 990 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
991 | !capable(CAP_NET_BIND_SERVICE)) { |
992 | err = -EACCES; | |
993 | goto done; | |
994 | } | |
8e87d142 | 995 | |
1da177e4 LT |
996 | write_lock_bh(&l2cap_sk_list.lock); |
997 | ||
f29972de | 998 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
999 | err = -EADDRINUSE; |
1000 | } else { | |
1001 | /* Save source address */ | |
f29972de MH |
1002 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
1003 | l2cap_pi(sk)->psm = la.l2_psm; | |
1004 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 1005 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 1006 | |
b4324b5d MH |
1007 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
1008 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 1009 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | write_unlock_bh(&l2cap_sk_list.lock); | |
1013 | ||
1014 | done: | |
1015 | release_sock(sk); | |
1016 | return err; | |
1017 | } | |
1018 | ||
1019 | static int l2cap_do_connect(struct sock *sk) | |
1020 | { | |
1021 | bdaddr_t *src = &bt_sk(sk)->src; | |
1022 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1023 | struct l2cap_conn *conn; | |
1024 | struct hci_conn *hcon; | |
1025 | struct hci_dev *hdev; | |
09ab6f4c | 1026 | __u8 auth_type; |
44d0e48e | 1027 | int err; |
1da177e4 | 1028 | |
f29972de MH |
1029 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
1030 | l2cap_pi(sk)->psm); | |
1da177e4 | 1031 | |
af05b30b GP |
1032 | hdev = hci_get_route(dst, src); |
1033 | if (!hdev) | |
1da177e4 LT |
1034 | return -EHOSTUNREACH; |
1035 | ||
1036 | hci_dev_lock_bh(hdev); | |
1037 | ||
1038 | err = -ENOMEM; | |
1039 | ||
8c1b2355 | 1040 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
1041 | switch (l2cap_pi(sk)->sec_level) { |
1042 | case BT_SECURITY_HIGH: | |
8c1b2355 | 1043 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
1044 | break; |
1045 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 1046 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
1047 | break; |
1048 | default: | |
09ab6f4c | 1049 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
1050 | break; |
1051 | } | |
8c1b2355 | 1052 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 1053 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 1054 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 1055 | else |
8c1b2355 | 1056 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
1057 | |
1058 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
1059 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 1060 | } else { |
2af6b9d5 MH |
1061 | switch (l2cap_pi(sk)->sec_level) { |
1062 | case BT_SECURITY_HIGH: | |
8c1b2355 | 1063 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
1064 | break; |
1065 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 1066 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
1067 | break; |
1068 | default: | |
8c1b2355 | 1069 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
1070 | break; |
1071 | } | |
09ab6f4c MH |
1072 | } |
1073 | ||
2af6b9d5 MH |
1074 | hcon = hci_connect(hdev, ACL_LINK, dst, |
1075 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
1076 | if (!hcon) |
1077 | goto done; | |
1078 | ||
1079 | conn = l2cap_conn_add(hcon, 0); | |
1080 | if (!conn) { | |
1081 | hci_conn_put(hcon); | |
1082 | goto done; | |
1083 | } | |
1084 | ||
1085 | err = 0; | |
1086 | ||
1087 | /* Update source addr of the socket */ | |
1088 | bacpy(src, conn->src); | |
1089 | ||
1090 | l2cap_chan_add(conn, sk, NULL); | |
1091 | ||
1092 | sk->sk_state = BT_CONNECT; | |
1093 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1094 | ||
1095 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1096 | if (sk->sk_type != SOCK_SEQPACKET && |
1097 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 LT |
1098 | l2cap_sock_clear_timer(sk); |
1099 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1100 | } else |
1101 | l2cap_do_start(sk); | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | done: | |
1105 | hci_dev_unlock_bh(hdev); | |
1106 | hci_dev_put(hdev); | |
1107 | return err; | |
1108 | } | |
1109 | ||
1110 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1111 | { | |
1da177e4 | 1112 | struct sock *sk = sock->sk; |
f29972de MH |
1113 | struct sockaddr_l2 la; |
1114 | int len, err = 0; | |
1da177e4 | 1115 | |
1da177e4 LT |
1116 | BT_DBG("sk %p", sk); |
1117 | ||
6503d961 CG |
1118 | if (!addr || alen < sizeof(addr->sa_family) || |
1119 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1120 | return -EINVAL; |
1da177e4 | 1121 | |
f29972de MH |
1122 | memset(&la, 0, sizeof(la)); |
1123 | len = min_t(unsigned int, sizeof(la), alen); | |
1124 | memcpy(&la, addr, len); | |
1125 | ||
2a517ca6 MH |
1126 | if (la.l2_cid) |
1127 | return -EINVAL; | |
1128 | ||
1129 | lock_sock(sk); | |
1130 | ||
bd3c9e25 GP |
1131 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1132 | && !la.l2_psm) { | |
1da177e4 LT |
1133 | err = -EINVAL; |
1134 | goto done; | |
1135 | } | |
1136 | ||
c6b03cf9 MH |
1137 | switch (l2cap_pi(sk)->mode) { |
1138 | case L2CAP_MODE_BASIC: | |
1139 | break; | |
1140 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1141 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1142 | if (enable_ertm) |
1143 | break; | |
1144 | /* fall through */ | |
1145 | default: | |
1146 | err = -ENOTSUPP; | |
1147 | goto done; | |
1148 | } | |
1149 | ||
af05b30b | 1150 | switch (sk->sk_state) { |
1da177e4 LT |
1151 | case BT_CONNECT: |
1152 | case BT_CONNECT2: | |
1153 | case BT_CONFIG: | |
1154 | /* Already connecting */ | |
1155 | goto wait; | |
1156 | ||
1157 | case BT_CONNECTED: | |
1158 | /* Already connected */ | |
1159 | goto done; | |
1160 | ||
1161 | case BT_OPEN: | |
1162 | case BT_BOUND: | |
1163 | /* Can connect */ | |
1164 | break; | |
1165 | ||
1166 | default: | |
1167 | err = -EBADFD; | |
1168 | goto done; | |
1169 | } | |
1170 | ||
1171 | /* Set destination address and psm */ | |
f29972de MH |
1172 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1173 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1174 | |
af05b30b GP |
1175 | err = l2cap_do_connect(sk); |
1176 | if (err) | |
1da177e4 LT |
1177 | goto done; |
1178 | ||
1179 | wait: | |
1180 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1181 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1182 | done: | |
1183 | release_sock(sk); | |
1184 | return err; | |
1185 | } | |
1186 | ||
1187 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1188 | { | |
1189 | struct sock *sk = sock->sk; | |
1190 | int err = 0; | |
1191 | ||
1192 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1193 | ||
1194 | lock_sock(sk); | |
1195 | ||
bd3c9e25 GP |
1196 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1197 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1198 | err = -EBADFD; |
1199 | goto done; | |
1200 | } | |
1201 | ||
c6b03cf9 MH |
1202 | switch (l2cap_pi(sk)->mode) { |
1203 | case L2CAP_MODE_BASIC: | |
1204 | break; | |
1205 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1206 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1207 | if (enable_ertm) |
1208 | break; | |
1209 | /* fall through */ | |
1210 | default: | |
1211 | err = -ENOTSUPP; | |
1212 | goto done; | |
1213 | } | |
1214 | ||
1da177e4 LT |
1215 | if (!l2cap_pi(sk)->psm) { |
1216 | bdaddr_t *src = &bt_sk(sk)->src; | |
1217 | u16 psm; | |
1218 | ||
1219 | err = -EINVAL; | |
1220 | ||
1221 | write_lock_bh(&l2cap_sk_list.lock); | |
1222 | ||
1223 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1224 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1225 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1226 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1227 | err = 0; |
1228 | break; | |
1229 | } | |
1230 | ||
1231 | write_unlock_bh(&l2cap_sk_list.lock); | |
1232 | ||
1233 | if (err < 0) | |
1234 | goto done; | |
1235 | } | |
1236 | ||
1237 | sk->sk_max_ack_backlog = backlog; | |
1238 | sk->sk_ack_backlog = 0; | |
1239 | sk->sk_state = BT_LISTEN; | |
1240 | ||
1241 | done: | |
1242 | release_sock(sk); | |
1243 | return err; | |
1244 | } | |
1245 | ||
1246 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1247 | { | |
1248 | DECLARE_WAITQUEUE(wait, current); | |
1249 | struct sock *sk = sock->sk, *nsk; | |
1250 | long timeo; | |
1251 | int err = 0; | |
1252 | ||
fcc70d5f | 1253 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1254 | |
1255 | if (sk->sk_state != BT_LISTEN) { | |
1256 | err = -EBADFD; | |
1257 | goto done; | |
1258 | } | |
1259 | ||
1260 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1261 | ||
1262 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1263 | ||
1264 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1265 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1266 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1267 | set_current_state(TASK_INTERRUPTIBLE); | |
1268 | if (!timeo) { | |
1269 | err = -EAGAIN; | |
1270 | break; | |
1271 | } | |
1272 | ||
1273 | release_sock(sk); | |
1274 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1275 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1276 | |
1277 | if (sk->sk_state != BT_LISTEN) { | |
1278 | err = -EBADFD; | |
1279 | break; | |
1280 | } | |
1281 | ||
1282 | if (signal_pending(current)) { | |
1283 | err = sock_intr_errno(timeo); | |
1284 | break; | |
1285 | } | |
1286 | } | |
1287 | set_current_state(TASK_RUNNING); | |
aa395145 | 1288 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1289 | |
1290 | if (err) | |
1291 | goto done; | |
1292 | ||
1293 | newsock->state = SS_CONNECTED; | |
1294 | ||
1295 | BT_DBG("new socket %p", nsk); | |
1296 | ||
1297 | done: | |
1298 | release_sock(sk); | |
1299 | return err; | |
1300 | } | |
1301 | ||
1302 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1303 | { | |
1304 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1305 | struct sock *sk = sock->sk; | |
1306 | ||
1307 | BT_DBG("sock %p, sk %p", sock, sk); | |
1308 | ||
1309 | addr->sa_family = AF_BLUETOOTH; | |
1310 | *len = sizeof(struct sockaddr_l2); | |
1311 | ||
f29972de MH |
1312 | if (peer) { |
1313 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1314 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1315 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1316 | } else { |
1317 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1318 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1319 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1320 | } |
1da177e4 | 1321 | |
1da177e4 LT |
1322 | return 0; |
1323 | } | |
1324 | ||
6161c038 GP |
1325 | static int __l2cap_wait_ack(struct sock *sk) |
1326 | { | |
1327 | DECLARE_WAITQUEUE(wait, current); | |
1328 | int err = 0; | |
1329 | int timeo = HZ/5; | |
1330 | ||
2b0b05dd | 1331 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1332 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
1333 | set_current_state(TASK_INTERRUPTIBLE); | |
1334 | ||
1335 | if (!timeo) | |
1336 | timeo = HZ/5; | |
1337 | ||
1338 | if (signal_pending(current)) { | |
1339 | err = sock_intr_errno(timeo); | |
1340 | break; | |
1341 | } | |
1342 | ||
1343 | release_sock(sk); | |
1344 | timeo = schedule_timeout(timeo); | |
1345 | lock_sock(sk); | |
1346 | ||
1347 | err = sock_error(sk); | |
1348 | if (err) | |
1349 | break; | |
1350 | } | |
1351 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1352 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1353 | return err; |
1354 | } | |
1355 | ||
e90bac06 GP |
1356 | static void l2cap_monitor_timeout(unsigned long arg) |
1357 | { | |
1358 | struct sock *sk = (void *) arg; | |
e90bac06 | 1359 | |
0e98958d GP |
1360 | BT_DBG("sk %p", sk); |
1361 | ||
e686219a | 1362 | bh_lock_sock(sk); |
e90bac06 | 1363 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 1364 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 1365 | bh_unlock_sock(sk); |
e90bac06 GP |
1366 | return; |
1367 | } | |
1368 | ||
1369 | l2cap_pi(sk)->retry_count++; | |
1370 | __mod_monitor_timer(); | |
1371 | ||
a2e12a2a | 1372 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1373 | bh_unlock_sock(sk); |
e90bac06 GP |
1374 | } |
1375 | ||
1376 | static void l2cap_retrans_timeout(unsigned long arg) | |
1377 | { | |
1378 | struct sock *sk = (void *) arg; | |
e90bac06 | 1379 | |
0e98958d GP |
1380 | BT_DBG("sk %p", sk); |
1381 | ||
e686219a | 1382 | bh_lock_sock(sk); |
e90bac06 GP |
1383 | l2cap_pi(sk)->retry_count = 1; |
1384 | __mod_monitor_timer(); | |
1385 | ||
1386 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1387 | ||
a2e12a2a | 1388 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1389 | bh_unlock_sock(sk); |
e90bac06 GP |
1390 | } |
1391 | ||
1c2acffb | 1392 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1393 | { |
1c2acffb | 1394 | struct sk_buff *skb; |
1da177e4 | 1395 | |
812e737e GP |
1396 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1397 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1398 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1399 | break; | |
1da177e4 | 1400 | |
1c2acffb GP |
1401 | skb = skb_dequeue(TX_QUEUE(sk)); |
1402 | kfree_skb(skb); | |
1da177e4 | 1403 | |
1c2acffb GP |
1404 | l2cap_pi(sk)->unacked_frames--; |
1405 | } | |
1da177e4 | 1406 | |
e90bac06 GP |
1407 | if (!l2cap_pi(sk)->unacked_frames) |
1408 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 1409 | } |
1da177e4 | 1410 | |
9a9c6a34 | 1411 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1412 | { |
1413 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1c2acffb GP |
1414 | |
1415 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1416 | |
9a9c6a34 | 1417 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
1418 | } |
1419 | ||
6840ed07 GP |
1420 | static int l2cap_streaming_send(struct sock *sk) |
1421 | { | |
1422 | struct sk_buff *skb, *tx_skb; | |
1423 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1424 | u16 control, fcs; |
6840ed07 GP |
1425 | |
1426 | while ((skb = sk->sk_send_head)) { | |
1427 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1428 | ||
1429 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1430 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; | |
1431 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1432 | ||
e8235c6b | 1433 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1434 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1435 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1436 | } | |
1437 | ||
9a9c6a34 | 1438 | l2cap_do_send(sk, tx_skb); |
6840ed07 GP |
1439 | |
1440 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1441 | ||
1442 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1443 | sk->sk_send_head = NULL; | |
1444 | else | |
1445 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
1446 | ||
1447 | skb = skb_dequeue(TX_QUEUE(sk)); | |
1448 | kfree_skb(skb); | |
1449 | } | |
1450 | return 0; | |
1451 | } | |
1452 | ||
dfc909be | 1453 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1454 | { |
1455 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1456 | struct sk_buff *skb, *tx_skb; | |
1457 | u16 control, fcs; | |
8f17154f GP |
1458 | |
1459 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1460 | if (!skb) |
1461 | return; | |
8f17154f | 1462 | |
f11d676d GP |
1463 | do { |
1464 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1465 | break; |
8f17154f | 1466 | |
f11d676d GP |
1467 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1468 | return; | |
8f17154f | 1469 | |
f11d676d | 1470 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1471 | |
f11d676d 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); |
f11d676d GP |
1475 | return; |
1476 | } | |
1477 | ||
1478 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1479 | bt_cb(skb)->retries++; | |
1480 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1481 | |
1482 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1483 | control |= L2CAP_CTRL_FINAL; | |
1484 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1485 | } | |
95ffa978 | 1486 | |
f11d676d GP |
1487 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1488 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1489 | |
f11d676d GP |
1490 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1491 | ||
1492 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1493 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1494 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1495 | } | |
1496 | ||
1497 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1498 | } |
1499 | ||
1c2acffb GP |
1500 | static int l2cap_ertm_send(struct sock *sk) |
1501 | { | |
1502 | struct sk_buff *skb, *tx_skb; | |
1503 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1504 | u16 control, fcs; |
9a9c6a34 | 1505 | int nsent = 0; |
1c2acffb | 1506 | |
c13ffa62 GP |
1507 | if (sk->sk_state != BT_CONNECTED) |
1508 | return -ENOTCONN; | |
e90bac06 | 1509 | |
6e2b6722 | 1510 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1511 | |
e90bac06 GP |
1512 | if (pi->remote_max_tx && |
1513 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1514 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1515 | break; |
1516 | } | |
1517 | ||
e420aba3 AE |
1518 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1519 | ||
e90bac06 GP |
1520 | bt_cb(skb)->retries++; |
1521 | ||
1c2acffb | 1522 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1523 | control &= L2CAP_CTRL_SAR; |
1524 | ||
d5392c8f GP |
1525 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1526 | control |= L2CAP_CTRL_FINAL; | |
1527 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1528 | } | |
9f121a5a | 1529 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1530 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1531 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1532 | ||
e90bac06 | 1533 | |
e8235c6b | 1534 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1535 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1536 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1537 | } | |
1538 | ||
9a9c6a34 GP |
1539 | l2cap_do_send(sk, tx_skb); |
1540 | ||
e90bac06 | 1541 | __mod_retrans_timer(); |
1c2acffb GP |
1542 | |
1543 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1544 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1545 | ||
1546 | pi->unacked_frames++; | |
d5392c8f | 1547 | pi->frames_sent++; |
1c2acffb GP |
1548 | |
1549 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1550 | sk->sk_send_head = NULL; | |
1551 | else | |
1552 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1553 | |
1554 | nsent++; | |
1c2acffb GP |
1555 | } |
1556 | ||
9e917af1 GP |
1557 | return nsent; |
1558 | } | |
1559 | ||
dfc909be GP |
1560 | static int l2cap_retransmit_frames(struct sock *sk) |
1561 | { | |
1562 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1563 | int ret; | |
1564 | ||
dfc909be GP |
1565 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1566 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1567 | ||
1568 | pi->next_tx_seq = pi->expected_ack_seq; | |
1569 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1570 | return ret; |
1571 | } | |
1572 | ||
9a9c6a34 | 1573 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1574 | { |
1575 | struct sock *sk = (struct sock *)pi; | |
1576 | u16 control = 0; | |
1577 | ||
1578 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1579 | ||
1580 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1581 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1582 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1583 | l2cap_send_sframe(pi, control); |
1584 | return; | |
9e917af1 | 1585 | } |
dfc909be | 1586 | |
e0f66218 | 1587 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1588 | return; |
1589 | ||
1590 | control |= L2CAP_SUPER_RCV_READY; | |
1591 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1592 | } |
1593 | ||
9a9c6a34 | 1594 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1595 | { |
1596 | struct srej_list *tail; | |
1597 | u16 control; | |
1598 | ||
1599 | control = L2CAP_SUPER_SELECT_REJECT; | |
1600 | control |= L2CAP_CTRL_FINAL; | |
1601 | ||
1602 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1603 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1604 | ||
1605 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1606 | } |
1607 | ||
1c2acffb GP |
1608 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1609 | { | |
1610 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1611 | struct sk_buff **frag; | |
1612 | int err, sent = 0; | |
1da177e4 | 1613 | |
59203a21 | 1614 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1615 | return -EFAULT; |
1da177e4 LT |
1616 | |
1617 | sent += count; | |
1618 | len -= count; | |
1619 | ||
1620 | /* Continuation fragments (no L2CAP header) */ | |
1621 | frag = &skb_shinfo(skb)->frag_list; | |
1622 | while (len) { | |
1623 | count = min_t(unsigned int, conn->mtu, len); | |
1624 | ||
1625 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1626 | if (!*frag) | |
1c2acffb GP |
1627 | return -EFAULT; |
1628 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) | |
1629 | return -EFAULT; | |
1da177e4 LT |
1630 | |
1631 | sent += count; | |
1632 | len -= count; | |
1633 | ||
1634 | frag = &(*frag)->next; | |
1635 | } | |
1da177e4 LT |
1636 | |
1637 | return sent; | |
1c2acffb | 1638 | } |
1da177e4 | 1639 | |
1c2acffb GP |
1640 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1641 | { | |
1642 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1643 | struct sk_buff *skb; | |
1644 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1645 | struct l2cap_hdr *lh; | |
1646 | ||
1647 | BT_DBG("sk %p len %d", sk, (int)len); | |
1648 | ||
1649 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1650 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1651 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1652 | if (!skb) | |
1653 | return ERR_PTR(-ENOMEM); | |
1654 | ||
1655 | /* Create L2CAP header */ | |
1656 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1657 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1658 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1659 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1660 | ||
1661 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1662 | if (unlikely(err < 0)) { | |
1663 | kfree_skb(skb); | |
1664 | return ERR_PTR(err); | |
1665 | } | |
1666 | return skb; | |
1667 | } | |
1668 | ||
1669 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1670 | { | |
1671 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1672 | struct sk_buff *skb; | |
1673 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1674 | struct l2cap_hdr *lh; | |
1675 | ||
1676 | BT_DBG("sk %p len %d", sk, (int)len); | |
1677 | ||
1678 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1679 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1680 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1681 | if (!skb) | |
1682 | return ERR_PTR(-ENOMEM); | |
1683 | ||
1684 | /* Create L2CAP header */ | |
1685 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1686 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1687 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1688 | ||
1689 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1690 | if (unlikely(err < 0)) { | |
1691 | kfree_skb(skb); | |
1692 | return ERR_PTR(err); | |
1693 | } | |
1694 | return skb; | |
1695 | } | |
1696 | ||
6840ed07 | 1697 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1698 | { |
1699 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1700 | struct sk_buff *skb; | |
1701 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1702 | struct l2cap_hdr *lh; | |
1703 | ||
1704 | BT_DBG("sk %p len %d", sk, (int)len); | |
1705 | ||
0ee0d208 GP |
1706 | if (!conn) |
1707 | return ERR_PTR(-ENOTCONN); | |
1708 | ||
c74e560c GP |
1709 | if (sdulen) |
1710 | hlen += 2; | |
1711 | ||
fcc203c3 GP |
1712 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1713 | hlen += 2; | |
1714 | ||
1c2acffb GP |
1715 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1716 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1717 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1718 | if (!skb) | |
1719 | return ERR_PTR(-ENOMEM); | |
1720 | ||
1721 | /* Create L2CAP header */ | |
1722 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1723 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1724 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1725 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1726 | if (sdulen) |
1727 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1728 | |
1729 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1730 | if (unlikely(err < 0)) { | |
1731 | kfree_skb(skb); | |
1732 | return ERR_PTR(err); | |
1733 | } | |
e90bac06 | 1734 | |
fcc203c3 GP |
1735 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1736 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1737 | ||
e90bac06 | 1738 | bt_cb(skb)->retries = 0; |
1c2acffb | 1739 | return skb; |
1da177e4 LT |
1740 | } |
1741 | ||
c74e560c GP |
1742 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1743 | { | |
1744 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1745 | struct sk_buff *skb; | |
1746 | struct sk_buff_head sar_queue; | |
1747 | u16 control; | |
1748 | size_t size = 0; | |
1749 | ||
ff12fd64 | 1750 | skb_queue_head_init(&sar_queue); |
c74e560c | 1751 | control = L2CAP_SDU_START; |
1c762159 | 1752 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1753 | if (IS_ERR(skb)) |
1754 | return PTR_ERR(skb); | |
1755 | ||
1756 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1757 | len -= pi->remote_mps; |
1758 | size += pi->remote_mps; | |
c74e560c GP |
1759 | |
1760 | while (len > 0) { | |
1761 | size_t buflen; | |
1762 | ||
1c762159 | 1763 | if (len > pi->remote_mps) { |
44651b85 | 1764 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1765 | buflen = pi->remote_mps; |
c74e560c | 1766 | } else { |
44651b85 | 1767 | control = L2CAP_SDU_END; |
c74e560c GP |
1768 | buflen = len; |
1769 | } | |
1770 | ||
6840ed07 | 1771 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1772 | if (IS_ERR(skb)) { |
1773 | skb_queue_purge(&sar_queue); | |
1774 | return PTR_ERR(skb); | |
1775 | } | |
1776 | ||
1777 | __skb_queue_tail(&sar_queue, skb); | |
1778 | len -= buflen; | |
1779 | size += buflen; | |
c74e560c GP |
1780 | } |
1781 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1782 | if (sk->sk_send_head == NULL) | |
1783 | sk->sk_send_head = sar_queue.next; | |
1784 | ||
1785 | return size; | |
1786 | } | |
1787 | ||
1da177e4 LT |
1788 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1789 | { | |
1790 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1791 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1792 | struct sk_buff *skb; | |
1793 | u16 control; | |
1794 | int err; | |
1da177e4 LT |
1795 | |
1796 | BT_DBG("sock %p, sk %p", sock, sk); | |
1797 | ||
c1cbe4b7 BL |
1798 | err = sock_error(sk); |
1799 | if (err) | |
1800 | return err; | |
1da177e4 LT |
1801 | |
1802 | if (msg->msg_flags & MSG_OOB) | |
1803 | return -EOPNOTSUPP; | |
1804 | ||
1da177e4 LT |
1805 | lock_sock(sk); |
1806 | ||
1c2acffb | 1807 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1808 | err = -ENOTCONN; |
1c2acffb GP |
1809 | goto done; |
1810 | } | |
1da177e4 | 1811 | |
1c2acffb GP |
1812 | /* Connectionless channel */ |
1813 | if (sk->sk_type == SOCK_DGRAM) { | |
1814 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1815 | if (IS_ERR(skb)) { |
477fffb0 | 1816 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1817 | } else { |
1818 | l2cap_do_send(sk, skb); | |
1819 | err = len; | |
1820 | } | |
1c2acffb GP |
1821 | goto done; |
1822 | } | |
1823 | ||
1824 | switch (pi->mode) { | |
1825 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1826 | /* Check outgoing MTU */ |
1827 | if (len > pi->omtu) { | |
1828 | err = -EINVAL; | |
1829 | goto done; | |
1830 | } | |
1831 | ||
1c2acffb GP |
1832 | /* Create a basic PDU */ |
1833 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1834 | if (IS_ERR(skb)) { | |
1835 | err = PTR_ERR(skb); | |
1836 | goto done; | |
1837 | } | |
1838 | ||
9a9c6a34 GP |
1839 | l2cap_do_send(sk, skb); |
1840 | err = len; | |
1c2acffb GP |
1841 | break; |
1842 | ||
1843 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1844 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1845 | /* Entire SDU fits into one PDU */ |
1c762159 | 1846 | if (len <= pi->remote_mps) { |
1c2acffb | 1847 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1848 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1849 | if (IS_ERR(skb)) { |
1850 | err = PTR_ERR(skb); | |
1851 | goto done; | |
1852 | } | |
c74e560c | 1853 | __skb_queue_tail(TX_QUEUE(sk), skb); |
dfc909be | 1854 | |
c74e560c GP |
1855 | if (sk->sk_send_head == NULL) |
1856 | sk->sk_send_head = skb; | |
dfc909be | 1857 | |
1c2acffb | 1858 | } else { |
c74e560c GP |
1859 | /* Segment SDU into multiples PDUs */ |
1860 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1861 | if (err < 0) | |
1862 | goto done; | |
1c2acffb | 1863 | } |
1c2acffb | 1864 | |
dfc909be | 1865 | if (pi->mode == L2CAP_MODE_STREAMING) { |
6840ed07 | 1866 | err = l2cap_streaming_send(sk); |
dfc909be | 1867 | } else { |
6e2b6722 GP |
1868 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && |
1869 | pi->conn_state && L2CAP_CONN_WAIT_F) { | |
1870 | err = len; | |
1871 | break; | |
1872 | } | |
6840ed07 | 1873 | err = l2cap_ertm_send(sk); |
dfc909be | 1874 | } |
6840ed07 | 1875 | |
9e917af1 | 1876 | if (err >= 0) |
1c2acffb GP |
1877 | err = len; |
1878 | break; | |
1879 | ||
1880 | default: | |
1881 | BT_DBG("bad state %1.1x", pi->mode); | |
1882 | err = -EINVAL; | |
1883 | } | |
1884 | ||
1885 | done: | |
1da177e4 LT |
1886 | release_sock(sk); |
1887 | return err; | |
1888 | } | |
1889 | ||
f66dc81f MH |
1890 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1891 | { | |
1892 | struct sock *sk = sock->sk; | |
1893 | ||
1894 | lock_sock(sk); | |
1895 | ||
1896 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1897 | struct l2cap_conn_rsp rsp; | |
1898 | ||
1899 | sk->sk_state = BT_CONFIG; | |
1900 | ||
1901 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1902 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1903 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1904 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1905 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1906 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1907 | ||
1908 | release_sock(sk); | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | release_sock(sk); | |
1913 | ||
1914 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1915 | } | |
1916 | ||
b7058842 | 1917 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1918 | { |
1919 | struct sock *sk = sock->sk; | |
1920 | struct l2cap_options opts; | |
f29972de | 1921 | int len, err = 0; |
1da177e4 LT |
1922 | u32 opt; |
1923 | ||
1924 | BT_DBG("sk %p", sk); | |
1925 | ||
1926 | lock_sock(sk); | |
1927 | ||
1928 | switch (optname) { | |
1929 | case L2CAP_OPTIONS: | |
0878b666 MH |
1930 | opts.imtu = l2cap_pi(sk)->imtu; |
1931 | opts.omtu = l2cap_pi(sk)->omtu; | |
1932 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1933 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1934 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1935 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1936 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1937 | |
1da177e4 LT |
1938 | len = min_t(unsigned int, sizeof(opts), optlen); |
1939 | if (copy_from_user((char *) &opts, optval, len)) { | |
1940 | err = -EFAULT; | |
1941 | break; | |
1942 | } | |
0878b666 | 1943 | |
45d65c46 GP |
1944 | if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { |
1945 | err = -EINVAL; | |
1946 | break; | |
1947 | } | |
1948 | ||
0041ecfa JPRV |
1949 | l2cap_pi(sk)->mode = opts.mode; |
1950 | switch (l2cap_pi(sk)->mode) { | |
1951 | case L2CAP_MODE_BASIC: | |
85eb53c6 | 1952 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; |
0041ecfa JPRV |
1953 | break; |
1954 | case L2CAP_MODE_ERTM: | |
1955 | case L2CAP_MODE_STREAMING: | |
1956 | if (enable_ertm) | |
1957 | break; | |
1958 | /* fall through */ | |
1959 | default: | |
1960 | err = -EINVAL; | |
1961 | break; | |
1962 | } | |
1963 | ||
c6b03cf9 MH |
1964 | l2cap_pi(sk)->imtu = opts.imtu; |
1965 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1966 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1967 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1968 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1969 | break; |
1970 | ||
1971 | case L2CAP_LM: | |
1972 | if (get_user(opt, (u32 __user *) optval)) { | |
1973 | err = -EFAULT; | |
1974 | break; | |
1975 | } | |
1976 | ||
2af6b9d5 MH |
1977 | if (opt & L2CAP_LM_AUTH) |
1978 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1979 | if (opt & L2CAP_LM_ENCRYPT) | |
1980 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1981 | if (opt & L2CAP_LM_SECURE) | |
1982 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1983 | ||
1984 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1985 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1986 | break; |
1987 | ||
1988 | default: | |
1989 | err = -ENOPROTOOPT; | |
1990 | break; | |
1991 | } | |
1992 | ||
1993 | release_sock(sk); | |
1994 | return err; | |
1995 | } | |
1996 | ||
b7058842 | 1997 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1998 | { |
1999 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
2000 | struct bt_security sec; |
2001 | int len, err = 0; | |
f66dc81f | 2002 | u32 opt; |
d58daf42 MH |
2003 | |
2004 | BT_DBG("sk %p", sk); | |
2005 | ||
2006 | if (level == SOL_L2CAP) | |
2007 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
2008 | ||
0588d94f MH |
2009 | if (level != SOL_BLUETOOTH) |
2010 | return -ENOPROTOOPT; | |
2011 | ||
d58daf42 MH |
2012 | lock_sock(sk); |
2013 | ||
2014 | switch (optname) { | |
2af6b9d5 | 2015 | case BT_SECURITY: |
bd3c9e25 GP |
2016 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2017 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2018 | err = -EINVAL; |
2019 | break; | |
2020 | } | |
2021 | ||
2af6b9d5 MH |
2022 | sec.level = BT_SECURITY_LOW; |
2023 | ||
2024 | len = min_t(unsigned int, sizeof(sec), optlen); | |
2025 | if (copy_from_user((char *) &sec, optval, len)) { | |
2026 | err = -EFAULT; | |
2027 | break; | |
2028 | } | |
2029 | ||
2030 | if (sec.level < BT_SECURITY_LOW || | |
2031 | sec.level > BT_SECURITY_HIGH) { | |
2032 | err = -EINVAL; | |
2033 | break; | |
2034 | } | |
2035 | ||
2036 | l2cap_pi(sk)->sec_level = sec.level; | |
2037 | break; | |
2038 | ||
f66dc81f MH |
2039 | case BT_DEFER_SETUP: |
2040 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2041 | err = -EINVAL; | |
2042 | break; | |
2043 | } | |
2044 | ||
2045 | if (get_user(opt, (u32 __user *) optval)) { | |
2046 | err = -EFAULT; | |
2047 | break; | |
2048 | } | |
2049 | ||
2050 | bt_sk(sk)->defer_setup = opt; | |
2051 | break; | |
2052 | ||
d58daf42 MH |
2053 | default: |
2054 | err = -ENOPROTOOPT; | |
2055 | break; | |
2056 | } | |
2057 | ||
2058 | release_sock(sk); | |
2059 | return err; | |
2060 | } | |
2061 | ||
2062 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
2063 | { |
2064 | struct sock *sk = sock->sk; | |
2065 | struct l2cap_options opts; | |
2066 | struct l2cap_conninfo cinfo; | |
2067 | int len, err = 0; | |
2af6b9d5 | 2068 | u32 opt; |
1da177e4 LT |
2069 | |
2070 | BT_DBG("sk %p", sk); | |
2071 | ||
2072 | if (get_user(len, optlen)) | |
2073 | return -EFAULT; | |
2074 | ||
2075 | lock_sock(sk); | |
2076 | ||
2077 | switch (optname) { | |
2078 | case L2CAP_OPTIONS: | |
2079 | opts.imtu = l2cap_pi(sk)->imtu; | |
2080 | opts.omtu = l2cap_pi(sk)->omtu; | |
2081 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 2082 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 2083 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 2084 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 2085 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
2086 | |
2087 | len = min_t(unsigned int, len, sizeof(opts)); | |
2088 | if (copy_to_user(optval, (char *) &opts, len)) | |
2089 | err = -EFAULT; | |
2090 | ||
2091 | break; | |
2092 | ||
2093 | case L2CAP_LM: | |
2af6b9d5 MH |
2094 | switch (l2cap_pi(sk)->sec_level) { |
2095 | case BT_SECURITY_LOW: | |
2096 | opt = L2CAP_LM_AUTH; | |
2097 | break; | |
2098 | case BT_SECURITY_MEDIUM: | |
2099 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
2100 | break; | |
2101 | case BT_SECURITY_HIGH: | |
2102 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
2103 | L2CAP_LM_SECURE; | |
2104 | break; | |
2105 | default: | |
2106 | opt = 0; | |
2107 | break; | |
2108 | } | |
2109 | ||
2110 | if (l2cap_pi(sk)->role_switch) | |
2111 | opt |= L2CAP_LM_MASTER; | |
2112 | ||
2113 | if (l2cap_pi(sk)->force_reliable) | |
2114 | opt |= L2CAP_LM_RELIABLE; | |
2115 | ||
2116 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
2117 | err = -EFAULT; |
2118 | break; | |
2119 | ||
2120 | case L2CAP_CONNINFO: | |
f66dc81f MH |
2121 | if (sk->sk_state != BT_CONNECTED && |
2122 | !(sk->sk_state == BT_CONNECT2 && | |
2123 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
2124 | err = -ENOTCONN; |
2125 | break; | |
2126 | } | |
2127 | ||
2128 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
2129 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
2130 | ||
2131 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
2132 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
2133 | err = -EFAULT; | |
2134 | ||
2135 | break; | |
2136 | ||
2137 | default: | |
2138 | err = -ENOPROTOOPT; | |
2139 | break; | |
2140 | } | |
2141 | ||
2142 | release_sock(sk); | |
2143 | return err; | |
2144 | } | |
2145 | ||
d58daf42 MH |
2146 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
2147 | { | |
2148 | struct sock *sk = sock->sk; | |
2af6b9d5 | 2149 | struct bt_security sec; |
d58daf42 MH |
2150 | int len, err = 0; |
2151 | ||
2152 | BT_DBG("sk %p", sk); | |
2153 | ||
2154 | if (level == SOL_L2CAP) | |
2155 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
2156 | ||
0588d94f MH |
2157 | if (level != SOL_BLUETOOTH) |
2158 | return -ENOPROTOOPT; | |
2159 | ||
d58daf42 MH |
2160 | if (get_user(len, optlen)) |
2161 | return -EFAULT; | |
2162 | ||
2163 | lock_sock(sk); | |
2164 | ||
2165 | switch (optname) { | |
2af6b9d5 | 2166 | case BT_SECURITY: |
bd3c9e25 GP |
2167 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2168 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2169 | err = -EINVAL; |
2170 | break; | |
2171 | } | |
2172 | ||
2af6b9d5 MH |
2173 | sec.level = l2cap_pi(sk)->sec_level; |
2174 | ||
2175 | len = min_t(unsigned int, len, sizeof(sec)); | |
2176 | if (copy_to_user(optval, (char *) &sec, len)) | |
2177 | err = -EFAULT; | |
2178 | ||
2179 | break; | |
2180 | ||
f66dc81f MH |
2181 | case BT_DEFER_SETUP: |
2182 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2183 | err = -EINVAL; | |
2184 | break; | |
2185 | } | |
2186 | ||
2187 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2188 | err = -EFAULT; | |
2189 | ||
2190 | break; | |
2191 | ||
d58daf42 MH |
2192 | default: |
2193 | err = -ENOPROTOOPT; | |
2194 | break; | |
2195 | } | |
2196 | ||
2197 | release_sock(sk); | |
2198 | return err; | |
2199 | } | |
2200 | ||
1da177e4 LT |
2201 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2202 | { | |
2203 | struct sock *sk = sock->sk; | |
2204 | int err = 0; | |
2205 | ||
2206 | BT_DBG("sock %p, sk %p", sock, sk); | |
2207 | ||
2208 | if (!sk) | |
2209 | return 0; | |
2210 | ||
2211 | lock_sock(sk); | |
2212 | if (!sk->sk_shutdown) { | |
6161c038 GP |
2213 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2214 | err = __l2cap_wait_ack(sk); | |
2215 | ||
1da177e4 LT |
2216 | sk->sk_shutdown = SHUTDOWN_MASK; |
2217 | l2cap_sock_clear_timer(sk); | |
2218 | __l2cap_sock_close(sk, 0); | |
2219 | ||
2220 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2221 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2222 | sk->sk_lingertime); | |
1da177e4 | 2223 | } |
9b108fc0 GP |
2224 | |
2225 | if (!err && sk->sk_err) | |
2226 | err = -sk->sk_err; | |
2227 | ||
1da177e4 LT |
2228 | release_sock(sk); |
2229 | return err; | |
2230 | } | |
2231 | ||
2232 | static int l2cap_sock_release(struct socket *sock) | |
2233 | { | |
2234 | struct sock *sk = sock->sk; | |
2235 | int err; | |
2236 | ||
2237 | BT_DBG("sock %p, sk %p", sock, sk); | |
2238 | ||
2239 | if (!sk) | |
2240 | return 0; | |
2241 | ||
2242 | err = l2cap_sock_shutdown(sock, 2); | |
2243 | ||
2244 | sock_orphan(sk); | |
2245 | l2cap_sock_kill(sk); | |
2246 | return err; | |
2247 | } | |
2248 | ||
1da177e4 LT |
2249 | static void l2cap_chan_ready(struct sock *sk) |
2250 | { | |
2251 | struct sock *parent = bt_sk(sk)->parent; | |
2252 | ||
2253 | BT_DBG("sk %p, parent %p", sk, parent); | |
2254 | ||
2255 | l2cap_pi(sk)->conf_state = 0; | |
2256 | l2cap_sock_clear_timer(sk); | |
2257 | ||
2258 | if (!parent) { | |
2259 | /* Outgoing channel. | |
2260 | * Wake up socket sleeping on connect. | |
2261 | */ | |
2262 | sk->sk_state = BT_CONNECTED; | |
2263 | sk->sk_state_change(sk); | |
2264 | } else { | |
2265 | /* Incoming channel. | |
2266 | * Wake up socket sleeping on accept. | |
2267 | */ | |
2268 | parent->sk_data_ready(parent, 0); | |
2269 | } | |
2270 | } | |
2271 | ||
2272 | /* Copy frame to all raw sockets on that connection */ | |
2273 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2274 | { | |
2275 | struct l2cap_chan_list *l = &conn->chan_list; | |
2276 | struct sk_buff *nskb; | |
af05b30b | 2277 | struct sock *sk; |
1da177e4 LT |
2278 | |
2279 | BT_DBG("conn %p", conn); | |
2280 | ||
2281 | read_lock(&l->lock); | |
2282 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2283 | if (sk->sk_type != SOCK_RAW) | |
2284 | continue; | |
2285 | ||
2286 | /* Don't send frame to the socket it came from */ | |
2287 | if (skb->sk == sk) | |
2288 | continue; | |
af05b30b GP |
2289 | nskb = skb_clone(skb, GFP_ATOMIC); |
2290 | if (!nskb) | |
1da177e4 LT |
2291 | continue; |
2292 | ||
2293 | if (sock_queue_rcv_skb(sk, nskb)) | |
2294 | kfree_skb(nskb); | |
2295 | } | |
2296 | read_unlock(&l->lock); | |
2297 | } | |
2298 | ||
2299 | /* ---- L2CAP signalling commands ---- */ | |
2300 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2301 | u8 code, u8 ident, u16 dlen, void *data) | |
2302 | { | |
2303 | struct sk_buff *skb, **frag; | |
2304 | struct l2cap_cmd_hdr *cmd; | |
2305 | struct l2cap_hdr *lh; | |
2306 | int len, count; | |
2307 | ||
af05b30b GP |
2308 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2309 | conn, code, ident, dlen); | |
1da177e4 LT |
2310 | |
2311 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2312 | count = min_t(unsigned int, conn->mtu, len); | |
2313 | ||
2314 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2315 | if (!skb) | |
2316 | return NULL; | |
2317 | ||
2318 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2319 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2320 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2321 | |
2322 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2323 | cmd->code = code; | |
2324 | cmd->ident = ident; | |
aca3192c | 2325 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2326 | |
2327 | if (dlen) { | |
2328 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2329 | memcpy(skb_put(skb, count), data, count); | |
2330 | data += count; | |
2331 | } | |
2332 | ||
2333 | len -= skb->len; | |
2334 | ||
2335 | /* Continuation fragments (no L2CAP header) */ | |
2336 | frag = &skb_shinfo(skb)->frag_list; | |
2337 | while (len) { | |
2338 | count = min_t(unsigned int, conn->mtu, len); | |
2339 | ||
2340 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2341 | if (!*frag) | |
2342 | goto fail; | |
2343 | ||
2344 | memcpy(skb_put(*frag, count), data, count); | |
2345 | ||
2346 | len -= count; | |
2347 | data += count; | |
2348 | ||
2349 | frag = &(*frag)->next; | |
2350 | } | |
2351 | ||
2352 | return skb; | |
2353 | ||
2354 | fail: | |
2355 | kfree_skb(skb); | |
2356 | return NULL; | |
2357 | } | |
2358 | ||
2359 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2360 | { | |
2361 | struct l2cap_conf_opt *opt = *ptr; | |
2362 | int len; | |
2363 | ||
2364 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2365 | *ptr += len; | |
2366 | ||
2367 | *type = opt->type; | |
2368 | *olen = opt->len; | |
2369 | ||
2370 | switch (opt->len) { | |
2371 | case 1: | |
2372 | *val = *((u8 *) opt->val); | |
2373 | break; | |
2374 | ||
2375 | case 2: | |
861d6882 | 2376 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
2377 | break; |
2378 | ||
2379 | case 4: | |
861d6882 | 2380 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
2381 | break; |
2382 | ||
2383 | default: | |
2384 | *val = (unsigned long) opt->val; | |
2385 | break; | |
2386 | } | |
2387 | ||
2388 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2389 | return len; | |
2390 | } | |
2391 | ||
1da177e4 LT |
2392 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2393 | { | |
2394 | struct l2cap_conf_opt *opt = *ptr; | |
2395 | ||
2396 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2397 | ||
2398 | opt->type = type; | |
2399 | opt->len = len; | |
2400 | ||
2401 | switch (len) { | |
2402 | case 1: | |
2403 | *((u8 *) opt->val) = val; | |
2404 | break; | |
2405 | ||
2406 | case 2: | |
8e036fc3 | 2407 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
2408 | break; |
2409 | ||
2410 | case 4: | |
8e036fc3 | 2411 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
2412 | break; |
2413 | ||
2414 | default: | |
2415 | memcpy(opt->val, (void *) val, len); | |
2416 | break; | |
2417 | } | |
2418 | ||
2419 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2420 | } | |
2421 | ||
c1b4f43b GP |
2422 | static void l2cap_ack_timeout(unsigned long arg) |
2423 | { | |
2424 | struct sock *sk = (void *) arg; | |
2425 | ||
2426 | bh_lock_sock(sk); | |
2427 | l2cap_send_ack(l2cap_pi(sk)); | |
2428 | bh_unlock_sock(sk); | |
2429 | } | |
2430 | ||
0565c1c2 GP |
2431 | static inline void l2cap_ertm_init(struct sock *sk) |
2432 | { | |
2433 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2434 | l2cap_pi(sk)->unacked_frames = 0; | |
2435 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2436 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2437 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2438 | |
2439 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2440 | l2cap_retrans_timeout, (unsigned long) sk); | |
2441 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2442 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2443 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2444 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2445 | |
2446 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
2447 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
2448 | ||
2449 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
0565c1c2 GP |
2450 | } |
2451 | ||
f2fcfcd6 GP |
2452 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2453 | { | |
2454 | switch (mode) { | |
2455 | case L2CAP_MODE_STREAMING: | |
2456 | case L2CAP_MODE_ERTM: | |
2457 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2458 | return mode; | |
2459 | /* fall through */ | |
2460 | default: | |
2461 | return L2CAP_MODE_BASIC; | |
2462 | } | |
2463 | } | |
2464 | ||
1da177e4 LT |
2465 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2466 | { | |
2467 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2468 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2469 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2470 | void *ptr = req->data; |
2471 | ||
2472 | BT_DBG("sk %p", sk); | |
2473 | ||
f2fcfcd6 GP |
2474 | if (pi->num_conf_req || pi->num_conf_rsp) |
2475 | goto done; | |
2476 | ||
2477 | switch (pi->mode) { | |
2478 | case L2CAP_MODE_STREAMING: | |
2479 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 2480 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 2481 | break; |
85eb53c6 | 2482 | |
2ba13ed6 | 2483 | /* fall through */ |
f2fcfcd6 GP |
2484 | default: |
2485 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2486 | break; | |
2487 | } | |
2488 | ||
2489 | done: | |
65c7c491 MH |
2490 | switch (pi->mode) { |
2491 | case L2CAP_MODE_BASIC: | |
2492 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
2493 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
62547752 GP |
2494 | |
2495 | rfc.mode = L2CAP_MODE_BASIC; | |
2496 | rfc.txwin_size = 0; | |
2497 | rfc.max_transmit = 0; | |
2498 | rfc.retrans_timeout = 0; | |
2499 | rfc.monitor_timeout = 0; | |
2500 | rfc.max_pdu_size = 0; | |
2501 | ||
65c7c491 MH |
2502 | break; |
2503 | ||
2504 | case L2CAP_MODE_ERTM: | |
2505 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2506 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2507 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2508 | rfc.retrans_timeout = 0; |
2509 | rfc.monitor_timeout = 0; | |
c74e560c | 2510 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2511 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2512 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 2513 | |
fcc203c3 GP |
2514 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2515 | break; | |
2516 | ||
2517 | if (pi->fcs == L2CAP_FCS_NONE || | |
2518 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2519 | pi->fcs = L2CAP_FCS_NONE; | |
2520 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2521 | } | |
f2fcfcd6 GP |
2522 | break; |
2523 | ||
2524 | case L2CAP_MODE_STREAMING: | |
2525 | rfc.mode = L2CAP_MODE_STREAMING; | |
2526 | rfc.txwin_size = 0; | |
2527 | rfc.max_transmit = 0; | |
2528 | rfc.retrans_timeout = 0; | |
2529 | rfc.monitor_timeout = 0; | |
c74e560c | 2530 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2531 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2532 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 2533 | |
fcc203c3 GP |
2534 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2535 | break; | |
2536 | ||
2537 | if (pi->fcs == L2CAP_FCS_NONE || | |
2538 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2539 | pi->fcs = L2CAP_FCS_NONE; | |
2540 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2541 | } | |
65c7c491 MH |
2542 | break; |
2543 | } | |
1da177e4 | 2544 | |
62547752 GP |
2545 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2546 | (unsigned long) &rfc); | |
2547 | ||
1da177e4 LT |
2548 | /* FIXME: Need actual value of the flush timeout */ |
2549 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2550 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2551 | ||
aca3192c YH |
2552 | req->dcid = cpu_to_le16(pi->dcid); |
2553 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2554 | |
2555 | return ptr - data; | |
2556 | } | |
2557 | ||
5dee9e7c | 2558 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2559 | { |
2560 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2561 | struct l2cap_conf_rsp *rsp = data; |
2562 | void *ptr = rsp->data; | |
2563 | void *req = pi->conf_req; | |
2564 | int len = pi->conf_len; | |
2565 | int type, hint, olen; | |
2566 | unsigned long val; | |
6464f35f | 2567 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2568 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2569 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2570 | |
5dee9e7c | 2571 | BT_DBG("sk %p", sk); |
820ae1b8 | 2572 | |
5dee9e7c MH |
2573 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2574 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2575 | |
589d2746 | 2576 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2577 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2578 | |
2579 | switch (type) { | |
2580 | case L2CAP_CONF_MTU: | |
861d6882 | 2581 | mtu = val; |
5dee9e7c MH |
2582 | break; |
2583 | ||
2584 | case L2CAP_CONF_FLUSH_TO: | |
2585 | pi->flush_to = val; | |
2586 | break; | |
2587 | ||
2588 | case L2CAP_CONF_QOS: | |
2589 | break; | |
2590 | ||
6464f35f MH |
2591 | case L2CAP_CONF_RFC: |
2592 | if (olen == sizeof(rfc)) | |
2593 | memcpy(&rfc, (void *) val, olen); | |
2594 | break; | |
2595 | ||
fcc203c3 GP |
2596 | case L2CAP_CONF_FCS: |
2597 | if (val == L2CAP_FCS_NONE) | |
2598 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2599 | ||
2600 | break; | |
2601 | ||
5dee9e7c MH |
2602 | default: |
2603 | if (hint) | |
2604 | break; | |
2605 | ||
2606 | result = L2CAP_CONF_UNKNOWN; | |
2607 | *((u8 *) ptr++) = type; | |
2608 | break; | |
2609 | } | |
2610 | } | |
2611 | ||
f2fcfcd6 GP |
2612 | if (pi->num_conf_rsp || pi->num_conf_req) |
2613 | goto done; | |
2614 | ||
2615 | switch (pi->mode) { | |
2616 | case L2CAP_MODE_STREAMING: | |
2617 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
2618 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
2619 | pi->mode = l2cap_select_mode(rfc.mode, | |
2620 | pi->conn->feat_mask); | |
2621 | break; | |
2622 | } | |
2623 | ||
742e519b | 2624 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 2625 | return -ECONNREFUSED; |
742e519b | 2626 | |
f2fcfcd6 | 2627 | break; |
f2fcfcd6 GP |
2628 | } |
2629 | ||
2630 | done: | |
2631 | if (pi->mode != rfc.mode) { | |
2632 | result = L2CAP_CONF_UNACCEPT; | |
2633 | rfc.mode = pi->mode; | |
2634 | ||
2635 | if (pi->num_conf_rsp == 1) | |
2636 | return -ECONNREFUSED; | |
2637 | ||
2638 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2639 | sizeof(rfc), (unsigned long) &rfc); | |
2640 | } | |
2641 | ||
2642 | ||
5dee9e7c MH |
2643 | if (result == L2CAP_CONF_SUCCESS) { |
2644 | /* Configure output options and let the other side know | |
2645 | * which ones we don't like. */ | |
2646 | ||
f2fcfcd6 GP |
2647 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2648 | result = L2CAP_CONF_UNACCEPT; | |
2649 | else { | |
2650 | pi->omtu = mtu; | |
2651 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2652 | } | |
2653 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2654 | |
f2fcfcd6 GP |
2655 | switch (rfc.mode) { |
2656 | case L2CAP_MODE_BASIC: | |
2657 | pi->fcs = L2CAP_FCS_NONE; | |
2658 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2659 | break; | |
2660 | ||
2661 | case L2CAP_MODE_ERTM: | |
2662 | pi->remote_tx_win = rfc.txwin_size; | |
2663 | pi->remote_max_tx = rfc.max_transmit; | |
1c762159 GP |
2664 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2665 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2666 | ||
2667 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2668 | |
10467e9e GP |
2669 | rfc.retrans_timeout = |
2670 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2671 | rfc.monitor_timeout = | |
2672 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2673 | |
2674 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2675 | |
2676 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2677 | sizeof(rfc), (unsigned long) &rfc); | |
2678 | ||
f2fcfcd6 GP |
2679 | break; |
2680 | ||
2681 | case L2CAP_MODE_STREAMING: | |
1c762159 GP |
2682 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2683 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2684 | ||
2685 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2686 | |
2687 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2688 | |
2689 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2690 | sizeof(rfc), (unsigned long) &rfc); | |
2691 | ||
f2fcfcd6 GP |
2692 | break; |
2693 | ||
2694 | default: | |
5dee9e7c | 2695 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2696 | |
6464f35f | 2697 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2698 | rfc.mode = pi->mode; |
2699 | } | |
6464f35f | 2700 | |
f2fcfcd6 GP |
2701 | if (result == L2CAP_CONF_SUCCESS) |
2702 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2703 | } | |
5dee9e7c MH |
2704 | rsp->scid = cpu_to_le16(pi->dcid); |
2705 | rsp->result = cpu_to_le16(result); | |
2706 | rsp->flags = cpu_to_le16(0x0000); | |
2707 | ||
2708 | return ptr - data; | |
1da177e4 LT |
2709 | } |
2710 | ||
f2fcfcd6 GP |
2711 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2712 | { | |
2713 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2714 | struct l2cap_conf_req *req = data; | |
2715 | void *ptr = req->data; | |
2716 | int type, olen; | |
2717 | unsigned long val; | |
2718 | struct l2cap_conf_rfc rfc; | |
2719 | ||
2720 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2721 | ||
2722 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2723 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2724 | ||
2725 | switch (type) { | |
2726 | case L2CAP_CONF_MTU: | |
2727 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2728 | *result = L2CAP_CONF_UNACCEPT; | |
2729 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; | |
2730 | } else | |
2731 | pi->omtu = val; | |
2732 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
2733 | break; | |
2734 | ||
2735 | case L2CAP_CONF_FLUSH_TO: | |
2736 | pi->flush_to = val; | |
2737 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2738 | 2, pi->flush_to); | |
2739 | break; | |
2740 | ||
2741 | case L2CAP_CONF_RFC: | |
2742 | if (olen == sizeof(rfc)) | |
2743 | memcpy(&rfc, (void *)val, olen); | |
2744 | ||
2745 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2746 | rfc.mode != pi->mode) | |
2747 | return -ECONNREFUSED; | |
2748 | ||
f2fcfcd6 GP |
2749 | pi->fcs = 0; |
2750 | ||
2751 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2752 | sizeof(rfc), (unsigned long) &rfc); | |
2753 | break; | |
2754 | } | |
2755 | } | |
2756 | ||
6c2ea7a8 GP |
2757 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
2758 | return -ECONNREFUSED; | |
2759 | ||
2760 | pi->mode = rfc.mode; | |
2761 | ||
f2fcfcd6 GP |
2762 | if (*result == L2CAP_CONF_SUCCESS) { |
2763 | switch (rfc.mode) { | |
2764 | case L2CAP_MODE_ERTM: | |
2765 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2766 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2767 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2768 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2769 | break; |
2770 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2771 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2772 | } |
2773 | } | |
2774 | ||
2775 | req->dcid = cpu_to_le16(pi->dcid); | |
2776 | req->flags = cpu_to_le16(0x0000); | |
2777 | ||
2778 | return ptr - data; | |
2779 | } | |
2780 | ||
5dee9e7c | 2781 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2782 | { |
2783 | struct l2cap_conf_rsp *rsp = data; | |
2784 | void *ptr = rsp->data; | |
1da177e4 | 2785 | |
5dee9e7c | 2786 | BT_DBG("sk %p", sk); |
1da177e4 | 2787 | |
aca3192c | 2788 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2789 | rsp->result = cpu_to_le16(result); |
aca3192c | 2790 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2791 | |
2792 | return ptr - data; | |
2793 | } | |
2794 | ||
7b1c0049 GP |
2795 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2796 | { | |
2797 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2798 | int type, olen; | |
2799 | unsigned long val; | |
2800 | struct l2cap_conf_rfc rfc; | |
2801 | ||
2802 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2803 | ||
2804 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2805 | return; | |
2806 | ||
2807 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2808 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2809 | ||
2810 | switch (type) { | |
2811 | case L2CAP_CONF_RFC: | |
2812 | if (olen == sizeof(rfc)) | |
2813 | memcpy(&rfc, (void *)val, olen); | |
2814 | goto done; | |
2815 | } | |
2816 | } | |
2817 | ||
2818 | done: | |
2819 | switch (rfc.mode) { | |
2820 | case L2CAP_MODE_ERTM: | |
2821 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2822 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2823 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2824 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2825 | break; | |
2826 | case L2CAP_MODE_STREAMING: | |
2827 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2828 | } | |
2829 | } | |
2830 | ||
4e8402a3 MH |
2831 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2832 | { | |
2833 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2834 | ||
2835 | if (rej->reason != 0x0000) | |
2836 | return 0; | |
2837 | ||
2838 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2839 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2840 | del_timer(&conn->info_timer); |
984947dc MH |
2841 | |
2842 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2843 | conn->info_ident = 0; |
984947dc | 2844 | |
4e8402a3 MH |
2845 | l2cap_conn_start(conn); |
2846 | } | |
2847 | ||
2848 | return 0; | |
2849 | } | |
2850 | ||
1da177e4 LT |
2851 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2852 | { | |
2853 | struct l2cap_chan_list *list = &conn->chan_list; | |
2854 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2855 | struct l2cap_conn_rsp rsp; | |
2856 | struct sock *sk, *parent; | |
e7c29cb1 | 2857 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2858 | |
2859 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2860 | __le16 psm = req->psm; |
1da177e4 LT |
2861 | |
2862 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2863 | ||
2864 | /* Check if we have socket listening on psm */ | |
2865 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2866 | if (!parent) { | |
2867 | result = L2CAP_CR_BAD_PSM; | |
2868 | goto sendresp; | |
2869 | } | |
2870 | ||
e7c29cb1 MH |
2871 | /* Check if the ACL is secure enough (if not SDP) */ |
2872 | if (psm != cpu_to_le16(0x0001) && | |
2873 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2874 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2875 | result = L2CAP_CR_SEC_BLOCK; |
2876 | goto response; | |
2877 | } | |
2878 | ||
1da177e4 LT |
2879 | result = L2CAP_CR_NO_MEM; |
2880 | ||
2881 | /* Check for backlog size */ | |
2882 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2883 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2884 | goto response; |
2885 | } | |
2886 | ||
3b1e0a65 | 2887 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2888 | if (!sk) |
2889 | goto response; | |
2890 | ||
fd1278d7 | 2891 | write_lock_bh(&list->lock); |
1da177e4 LT |
2892 | |
2893 | /* Check if we already have channel with that dcid */ | |
2894 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2895 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2896 | sock_set_flag(sk, SOCK_ZAPPED); |
2897 | l2cap_sock_kill(sk); | |
2898 | goto response; | |
2899 | } | |
2900 | ||
2901 | hci_conn_hold(conn->hcon); | |
2902 | ||
2903 | l2cap_sock_init(sk, parent); | |
2904 | bacpy(&bt_sk(sk)->src, conn->src); | |
2905 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2906 | l2cap_pi(sk)->psm = psm; | |
2907 | l2cap_pi(sk)->dcid = scid; | |
2908 | ||
2909 | __l2cap_chan_add(conn, sk, parent); | |
2910 | dcid = l2cap_pi(sk)->scid; | |
2911 | ||
2912 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2913 | ||
1da177e4 LT |
2914 | l2cap_pi(sk)->ident = cmd->ident; |
2915 | ||
984947dc | 2916 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2917 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2918 | if (bt_sk(sk)->defer_setup) { |
2919 | sk->sk_state = BT_CONNECT2; | |
2920 | result = L2CAP_CR_PEND; | |
2921 | status = L2CAP_CS_AUTHOR_PEND; | |
2922 | parent->sk_data_ready(parent, 0); | |
2923 | } else { | |
2924 | sk->sk_state = BT_CONFIG; | |
2925 | result = L2CAP_CR_SUCCESS; | |
2926 | status = L2CAP_CS_NO_INFO; | |
2927 | } | |
79d554a6 MH |
2928 | } else { |
2929 | sk->sk_state = BT_CONNECT2; | |
2930 | result = L2CAP_CR_PEND; | |
2931 | status = L2CAP_CS_AUTHEN_PEND; | |
2932 | } | |
2933 | } else { | |
2934 | sk->sk_state = BT_CONNECT2; | |
2935 | result = L2CAP_CR_PEND; | |
2936 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2937 | } |
2938 | ||
fd1278d7 | 2939 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2940 | |
2941 | response: | |
2942 | bh_unlock_sock(parent); | |
2943 | ||
2944 | sendresp: | |
aca3192c YH |
2945 | rsp.scid = cpu_to_le16(scid); |
2946 | rsp.dcid = cpu_to_le16(dcid); | |
2947 | rsp.result = cpu_to_le16(result); | |
2948 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2949 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2950 | |
2951 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2952 | struct l2cap_info_req info; | |
2953 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2954 | ||
2955 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2956 | conn->info_ident = l2cap_get_ident(conn); | |
2957 | ||
2958 | mod_timer(&conn->info_timer, jiffies + | |
2959 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2960 | ||
2961 | l2cap_send_cmd(conn, conn->info_ident, | |
2962 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2963 | } | |
2964 | ||
1da177e4 LT |
2965 | return 0; |
2966 | } | |
2967 | ||
2968 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2969 | { | |
2970 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2971 | u16 scid, dcid, result, status; | |
2972 | struct sock *sk; | |
2973 | u8 req[128]; | |
2974 | ||
2975 | scid = __le16_to_cpu(rsp->scid); | |
2976 | dcid = __le16_to_cpu(rsp->dcid); | |
2977 | result = __le16_to_cpu(rsp->result); | |
2978 | status = __le16_to_cpu(rsp->status); | |
2979 | ||
2980 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2981 | ||
2982 | if (scid) { | |
af05b30b GP |
2983 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2984 | if (!sk) | |
1da177e4 LT |
2985 | return 0; |
2986 | } else { | |
af05b30b GP |
2987 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2988 | if (!sk) | |
1da177e4 LT |
2989 | return 0; |
2990 | } | |
2991 | ||
2992 | switch (result) { | |
2993 | case L2CAP_CR_SUCCESS: | |
2994 | sk->sk_state = BT_CONFIG; | |
2995 | l2cap_pi(sk)->ident = 0; | |
2996 | l2cap_pi(sk)->dcid = dcid; | |
2997 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
6a8d3010 MH |
2998 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2999 | ||
1da177e4 LT |
3000 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3001 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 3002 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3003 | break; |
3004 | ||
3005 | case L2CAP_CR_PEND: | |
6a8d3010 | 3006 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
3007 | break; |
3008 | ||
3009 | default: | |
3010 | l2cap_chan_del(sk, ECONNREFUSED); | |
3011 | break; | |
3012 | } | |
3013 | ||
3014 | bh_unlock_sock(sk); | |
3015 | return 0; | |
3016 | } | |
3017 | ||
88219a0f | 3018 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3019 | { |
3020 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3021 | u16 dcid, flags; | |
3022 | u8 rsp[64]; | |
3023 | struct sock *sk; | |
5dee9e7c | 3024 | int len; |
1da177e4 LT |
3025 | |
3026 | dcid = __le16_to_cpu(req->dcid); | |
3027 | flags = __le16_to_cpu(req->flags); | |
3028 | ||
3029 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3030 | ||
af05b30b GP |
3031 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3032 | if (!sk) | |
1da177e4 LT |
3033 | return -ENOENT; |
3034 | ||
8cb8e6f1 GP |
3035 | if (sk->sk_state != BT_CONFIG) { |
3036 | struct l2cap_cmd_rej rej; | |
3037 | ||
3038 | rej.reason = cpu_to_le16(0x0002); | |
3039 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
3040 | sizeof(rej), &rej); | |
354f60a9 | 3041 | goto unlock; |
8cb8e6f1 | 3042 | } |
354f60a9 | 3043 | |
5dee9e7c | 3044 | /* Reject if config buffer is too small. */ |
88219a0f | 3045 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
3046 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
3047 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3048 | l2cap_build_conf_rsp(sk, rsp, | |
3049 | L2CAP_CONF_REJECT, flags), rsp); | |
3050 | goto unlock; | |
3051 | } | |
3052 | ||
3053 | /* Store config. */ | |
3054 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
3055 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
3056 | |
3057 | if (flags & 0x0001) { | |
3058 | /* Incomplete config. Send empty response. */ | |
3059 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
3060 | l2cap_build_conf_rsp(sk, rsp, |
3061 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
3062 | goto unlock; |
3063 | } | |
3064 | ||
3065 | /* Complete config. */ | |
5dee9e7c | 3066 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 3067 | if (len < 0) { |
9b108fc0 | 3068 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 3069 | goto unlock; |
f2fcfcd6 | 3070 | } |
1da177e4 | 3071 | |
5dee9e7c | 3072 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 3073 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 3074 | |
5dee9e7c MH |
3075 | /* Reset config buffer. */ |
3076 | l2cap_pi(sk)->conf_len = 0; | |
3077 | ||
876d9484 MH |
3078 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
3079 | goto unlock; | |
3080 | ||
1da177e4 | 3081 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
f64f9e71 JP |
3082 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3083 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3084 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3085 | ||
1da177e4 | 3086 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 3087 | |
0565c1c2 GP |
3088 | l2cap_pi(sk)->next_tx_seq = 0; |
3089 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 3090 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3091 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3092 | l2cap_ertm_init(sk); | |
3093 | ||
1da177e4 | 3094 | l2cap_chan_ready(sk); |
876d9484 MH |
3095 | goto unlock; |
3096 | } | |
3097 | ||
3098 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 3099 | u8 buf[64]; |
1da177e4 | 3100 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 3101 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 3102 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3103 | } |
3104 | ||
3105 | unlock: | |
3106 | bh_unlock_sock(sk); | |
3107 | return 0; | |
3108 | } | |
3109 | ||
3110 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3111 | { | |
3112 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3113 | u16 scid, flags, result; | |
3114 | struct sock *sk; | |
7b1c0049 | 3115 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
3116 | |
3117 | scid = __le16_to_cpu(rsp->scid); | |
3118 | flags = __le16_to_cpu(rsp->flags); | |
3119 | result = __le16_to_cpu(rsp->result); | |
3120 | ||
af05b30b GP |
3121 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
3122 | scid, flags, result); | |
1da177e4 | 3123 | |
af05b30b GP |
3124 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3125 | if (!sk) | |
1da177e4 LT |
3126 | return 0; |
3127 | ||
3128 | switch (result) { | |
3129 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 3130 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
3131 | break; |
3132 | ||
3133 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 3134 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3135 | char req[64]; |
3136 | ||
c2c77ec8 | 3137 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 3138 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
3139 | goto done; |
3140 | } | |
3141 | ||
f2fcfcd6 GP |
3142 | /* throw out any old stored conf requests */ |
3143 | result = L2CAP_CONF_SUCCESS; | |
3144 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
3145 | len, req, &result); | |
3146 | if (len < 0) { | |
9b108fc0 | 3147 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
3148 | goto done; |
3149 | } | |
3150 | ||
3151 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3152 | L2CAP_CONF_REQ, len, req); | |
3153 | l2cap_pi(sk)->num_conf_req++; | |
3154 | if (result != L2CAP_CONF_SUCCESS) | |
3155 | goto done; | |
3156 | break; | |
1da177e4 LT |
3157 | } |
3158 | ||
8e87d142 | 3159 | default: |
b1235d79 | 3160 | sk->sk_err = ECONNRESET; |
1da177e4 | 3161 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 3162 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
3163 | goto done; |
3164 | } | |
3165 | ||
3166 | if (flags & 0x01) | |
3167 | goto done; | |
3168 | ||
1da177e4 LT |
3169 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3170 | ||
3171 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
f64f9e71 JP |
3172 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3173 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3174 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3175 | ||
1da177e4 | 3176 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3177 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3178 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3179 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3180 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3181 | l2cap_ertm_init(sk); | |
3182 | ||
1da177e4 LT |
3183 | l2cap_chan_ready(sk); |
3184 | } | |
3185 | ||
3186 | done: | |
3187 | bh_unlock_sock(sk); | |
3188 | return 0; | |
3189 | } | |
3190 | ||
3191 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3192 | { | |
3193 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3194 | struct l2cap_disconn_rsp rsp; | |
3195 | u16 dcid, scid; | |
3196 | struct sock *sk; | |
3197 | ||
3198 | scid = __le16_to_cpu(req->scid); | |
3199 | dcid = __le16_to_cpu(req->dcid); | |
3200 | ||
3201 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3202 | ||
af05b30b GP |
3203 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3204 | if (!sk) | |
1da177e4 LT |
3205 | return 0; |
3206 | ||
aca3192c YH |
3207 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3208 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3209 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3210 | ||
3211 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3212 | ||
3213 | l2cap_chan_del(sk, ECONNRESET); | |
3214 | bh_unlock_sock(sk); | |
3215 | ||
3216 | l2cap_sock_kill(sk); | |
3217 | return 0; | |
3218 | } | |
3219 | ||
3220 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3221 | { | |
3222 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3223 | u16 dcid, scid; | |
3224 | struct sock *sk; | |
3225 | ||
3226 | scid = __le16_to_cpu(rsp->scid); | |
3227 | dcid = __le16_to_cpu(rsp->dcid); | |
3228 | ||
3229 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3230 | ||
af05b30b GP |
3231 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3232 | if (!sk) | |
1da177e4 LT |
3233 | return 0; |
3234 | ||
3235 | l2cap_chan_del(sk, 0); | |
3236 | bh_unlock_sock(sk); | |
3237 | ||
3238 | l2cap_sock_kill(sk); | |
3239 | return 0; | |
3240 | } | |
3241 | ||
3242 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3243 | { | |
3244 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3245 | u16 type; |
3246 | ||
3247 | type = __le16_to_cpu(req->type); | |
3248 | ||
3249 | BT_DBG("type 0x%4.4x", type); | |
3250 | ||
f0709e03 MH |
3251 | if (type == L2CAP_IT_FEAT_MASK) { |
3252 | u8 buf[8]; | |
44dd46de | 3253 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3254 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3255 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3256 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de | 3257 | if (enable_ertm) |
fcc203c3 GP |
3258 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3259 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3260 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3261 | l2cap_send_cmd(conn, cmd->ident, |
3262 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3263 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3264 | u8 buf[12]; | |
3265 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3266 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3267 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3268 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3269 | l2cap_send_cmd(conn, cmd->ident, | |
3270 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3271 | } else { |
3272 | struct l2cap_info_rsp rsp; | |
3273 | rsp.type = cpu_to_le16(type); | |
3274 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3275 | l2cap_send_cmd(conn, cmd->ident, | |
3276 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3277 | } | |
1da177e4 LT |
3278 | |
3279 | return 0; | |
3280 | } | |
3281 | ||
3282 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3283 | { | |
3284 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3285 | u16 type, result; | |
3286 | ||
3287 | type = __le16_to_cpu(rsp->type); | |
3288 | result = __le16_to_cpu(rsp->result); | |
3289 | ||
3290 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3291 | ||
4e8402a3 MH |
3292 | del_timer(&conn->info_timer); |
3293 | ||
984947dc | 3294 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3295 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3296 | |
47ec1dcd | 3297 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3298 | struct l2cap_info_req req; |
3299 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3300 | ||
3301 | conn->info_ident = l2cap_get_ident(conn); | |
3302 | ||
3303 | l2cap_send_cmd(conn, conn->info_ident, | |
3304 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3305 | } else { | |
3306 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3307 | conn->info_ident = 0; | |
3308 | ||
3309 | l2cap_conn_start(conn); | |
3310 | } | |
3311 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3312 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3313 | conn->info_ident = 0; |
984947dc MH |
3314 | |
3315 | l2cap_conn_start(conn); | |
3316 | } | |
4e8402a3 | 3317 | |
1da177e4 LT |
3318 | return 0; |
3319 | } | |
3320 | ||
3321 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3322 | { | |
3323 | u8 *data = skb->data; | |
3324 | int len = skb->len; | |
3325 | struct l2cap_cmd_hdr cmd; | |
3326 | int err = 0; | |
3327 | ||
3328 | l2cap_raw_recv(conn, skb); | |
3329 | ||
3330 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3331 | u16 cmd_len; |
1da177e4 LT |
3332 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3333 | data += L2CAP_CMD_HDR_SIZE; | |
3334 | len -= L2CAP_CMD_HDR_SIZE; | |
3335 | ||
88219a0f | 3336 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3337 | |
88219a0f | 3338 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3339 | |
88219a0f | 3340 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3341 | BT_DBG("corrupted command"); |
3342 | break; | |
3343 | } | |
3344 | ||
3345 | switch (cmd.code) { | |
3346 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3347 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3348 | break; |
3349 | ||
3350 | case L2CAP_CONN_REQ: | |
3351 | err = l2cap_connect_req(conn, &cmd, data); | |
3352 | break; | |
3353 | ||
3354 | case L2CAP_CONN_RSP: | |
3355 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3356 | break; | |
3357 | ||
3358 | case L2CAP_CONF_REQ: | |
88219a0f | 3359 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3360 | break; |
3361 | ||
3362 | case L2CAP_CONF_RSP: | |
3363 | err = l2cap_config_rsp(conn, &cmd, data); | |
3364 | break; | |
3365 | ||
3366 | case L2CAP_DISCONN_REQ: | |
3367 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3368 | break; | |
3369 | ||
3370 | case L2CAP_DISCONN_RSP: | |
3371 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3372 | break; | |
3373 | ||
3374 | case L2CAP_ECHO_REQ: | |
88219a0f | 3375 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3376 | break; |
3377 | ||
3378 | case L2CAP_ECHO_RSP: | |
3379 | break; | |
3380 | ||
3381 | case L2CAP_INFO_REQ: | |
3382 | err = l2cap_information_req(conn, &cmd, data); | |
3383 | break; | |
3384 | ||
3385 | case L2CAP_INFO_RSP: | |
3386 | err = l2cap_information_rsp(conn, &cmd, data); | |
3387 | break; | |
3388 | ||
3389 | default: | |
3390 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3391 | err = -EINVAL; | |
3392 | break; | |
3393 | } | |
3394 | ||
3395 | if (err) { | |
3396 | struct l2cap_cmd_rej rej; | |
3397 | BT_DBG("error %d", err); | |
3398 | ||
3399 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3400 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3401 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3402 | } | |
3403 | ||
88219a0f AV |
3404 | data += cmd_len; |
3405 | len -= cmd_len; | |
1da177e4 LT |
3406 | } |
3407 | ||
3408 | kfree_skb(skb); | |
3409 | } | |
3410 | ||
fcc203c3 GP |
3411 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3412 | { | |
3413 | u16 our_fcs, rcv_fcs; | |
3414 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3415 | ||
3416 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3417 | skb_trim(skb, skb->len - 2); | |
3418 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3419 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3420 | ||
3421 | if (our_fcs != rcv_fcs) | |
3422 | return -EINVAL; | |
3423 | } | |
3424 | return 0; | |
3425 | } | |
3426 | ||
d5392c8f GP |
3427 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3428 | { | |
3429 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3430 | u16 control = 0; | |
3431 | ||
3432 | pi->frames_sent = 0; | |
d5392c8f GP |
3433 | |
3434 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3435 | ||
3436 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 3437 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 3438 | l2cap_send_sframe(pi, control); |
1890d36b | 3439 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
3440 | } |
3441 | ||
4ea727ef GP |
3442 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
3443 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
3444 | |
3445 | l2cap_ertm_send(sk); | |
3446 | ||
3447 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3448 | pi->frames_sent == 0) { | |
3449 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3450 | l2cap_send_sframe(pi, control); |
3451 | } | |
3452 | } | |
3453 | ||
9b53350d | 3454 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3455 | { |
3456 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
3457 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3458 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
3459 | |
3460 | bt_cb(skb)->tx_seq = tx_seq; | |
3461 | bt_cb(skb)->sar = sar; | |
3462 | ||
3463 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3464 | if (!next_skb) { | |
3465 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 3466 | return 0; |
8f17154f GP |
3467 | } |
3468 | ||
bfbacc11 JPRV |
3469 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3470 | if (tx_seq_offset < 0) | |
3471 | tx_seq_offset += 64; | |
3472 | ||
8f17154f | 3473 | do { |
9b53350d JPRV |
3474 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3475 | return -EINVAL; | |
3476 | ||
bfbacc11 JPRV |
3477 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
3478 | pi->buffer_seq) % 64; | |
3479 | if (next_tx_seq_offset < 0) | |
3480 | next_tx_seq_offset += 64; | |
3481 | ||
3482 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 3483 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 3484 | return 0; |
8f17154f GP |
3485 | } |
3486 | ||
3487 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3488 | break; | |
3489 | ||
59203a21 | 3490 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3491 | |
3492 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
3493 | |
3494 | return 0; | |
8f17154f GP |
3495 | } |
3496 | ||
18778a63 GP |
3497 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3498 | { | |
3499 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3500 | struct sk_buff *_skb; | |
1890d36b | 3501 | int err; |
18778a63 GP |
3502 | |
3503 | switch (control & L2CAP_CTRL_SAR) { | |
3504 | case L2CAP_SDU_UNSEGMENTED: | |
3505 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3506 | goto drop; | |
3507 | ||
3508 | err = sock_queue_rcv_skb(sk, skb); | |
3509 | if (!err) | |
3510 | return err; | |
3511 | ||
3512 | break; | |
3513 | ||
3514 | case L2CAP_SDU_START: | |
3515 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3516 | goto drop; | |
3517 | ||
3518 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
3519 | |
3520 | if (pi->sdu_len > pi->imtu) | |
3521 | goto disconnect; | |
3522 | ||
3523 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
3524 | if (!pi->sdu) |
3525 | return -ENOMEM; | |
3526 | ||
3527 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3528 | * condition we have to be sure that this will be executed | |
3529 | * only once, i.e., when alloc does not fail */ | |
3530 | skb_pull(skb, 2); | |
18778a63 GP |
3531 | |
3532 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3533 | ||
3534 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3535 | pi->partial_sdu_len = skb->len; | |
3536 | break; | |
3537 | ||
3538 | case L2CAP_SDU_CONTINUE: | |
3539 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3540 | goto disconnect; | |
3541 | ||
3542 | if (!pi->sdu) | |
3543 | goto disconnect; | |
3544 | ||
18778a63 GP |
3545 | pi->partial_sdu_len += skb->len; |
3546 | if (pi->partial_sdu_len > pi->sdu_len) | |
3547 | goto drop; | |
3548 | ||
4178ba46 GP |
3549 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3550 | ||
18778a63 GP |
3551 | break; |
3552 | ||
3553 | case L2CAP_SDU_END: | |
3554 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3555 | goto disconnect; | |
3556 | ||
3557 | if (!pi->sdu) | |
3558 | goto disconnect; | |
3559 | ||
1890d36b | 3560 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 3561 | pi->partial_sdu_len += skb->len; |
18778a63 | 3562 | |
1890d36b GP |
3563 | if (pi->partial_sdu_len > pi->imtu) |
3564 | goto drop; | |
18778a63 | 3565 | |
1890d36b GP |
3566 | if (pi->partial_sdu_len != pi->sdu_len) |
3567 | goto drop; | |
4178ba46 GP |
3568 | |
3569 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 3570 | } |
18778a63 GP |
3571 | |
3572 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
3573 | if (!_skb) { |
3574 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
3575 | return -ENOMEM; | |
3576 | } | |
3577 | ||
18778a63 | 3578 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 3579 | if (err < 0) { |
18778a63 | 3580 | kfree_skb(_skb); |
1890d36b GP |
3581 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
3582 | return err; | |
3583 | } | |
3584 | ||
3585 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
3586 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
3587 | |
3588 | kfree_skb(pi->sdu); | |
3589 | break; | |
3590 | } | |
3591 | ||
3592 | kfree_skb(skb); | |
1890d36b | 3593 | return 0; |
18778a63 GP |
3594 | |
3595 | drop: | |
3596 | kfree_skb(pi->sdu); | |
3597 | pi->sdu = NULL; | |
3598 | ||
3599 | disconnect: | |
9b108fc0 | 3600 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
3601 | kfree_skb(skb); |
3602 | return 0; | |
3603 | } | |
3604 | ||
1890d36b GP |
3605 | static void l2cap_busy_work(struct work_struct *work) |
3606 | { | |
3607 | DECLARE_WAITQUEUE(wait, current); | |
3608 | struct l2cap_pinfo *pi = | |
3609 | container_of(work, struct l2cap_pinfo, busy_work); | |
3610 | struct sock *sk = (struct sock *)pi; | |
3611 | int n_tries = 0, timeo = HZ/5, err; | |
3612 | struct sk_buff *skb; | |
3613 | u16 control; | |
3614 | ||
3615 | lock_sock(sk); | |
3616 | ||
2b0b05dd | 3617 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3618 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
3619 | set_current_state(TASK_INTERRUPTIBLE); | |
3620 | ||
3621 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3622 | err = -EBUSY; | |
9b108fc0 | 3623 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
1890d36b GP |
3624 | goto done; |
3625 | } | |
3626 | ||
3627 | if (!timeo) | |
3628 | timeo = HZ/5; | |
3629 | ||
3630 | if (signal_pending(current)) { | |
3631 | err = sock_intr_errno(timeo); | |
3632 | goto done; | |
3633 | } | |
3634 | ||
3635 | release_sock(sk); | |
3636 | timeo = schedule_timeout(timeo); | |
3637 | lock_sock(sk); | |
3638 | ||
3639 | err = sock_error(sk); | |
3640 | if (err) | |
3641 | goto done; | |
3642 | ||
3643 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
3644 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
3645 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3646 | if (err < 0) { | |
3647 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
3648 | break; | |
3649 | } | |
3650 | ||
3651 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3652 | } | |
3653 | ||
3654 | if (!skb) | |
3655 | break; | |
3656 | } | |
3657 | ||
3658 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
3659 | goto done; | |
3660 | ||
3661 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3662 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
3663 | l2cap_send_sframe(pi, control); | |
3664 | l2cap_pi(sk)->retry_count = 1; | |
3665 | ||
3666 | del_timer(&pi->retrans_timer); | |
3667 | __mod_monitor_timer(); | |
3668 | ||
3669 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
3670 | ||
3671 | done: | |
3672 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
3673 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
3674 | ||
0e98958d GP |
3675 | BT_DBG("sk %p, Exit local busy", sk); |
3676 | ||
1890d36b | 3677 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3678 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3679 | |
3680 | release_sock(sk); | |
3681 | } | |
3682 | ||
3683 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
3684 | { | |
3685 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3686 | int sctrl, err; | |
3687 | ||
3688 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3689 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3690 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3691 | return -EBUSY; | |
3692 | } | |
3693 | ||
3694 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3695 | if (err >= 0) { | |
3696 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3697 | return err; | |
3698 | } | |
3699 | ||
3700 | /* Busy Condition */ | |
0e98958d GP |
3701 | BT_DBG("sk %p, Enter local busy", sk); |
3702 | ||
1890d36b GP |
3703 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
3704 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3705 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3706 | ||
3707 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3708 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
3709 | l2cap_send_sframe(pi, sctrl); | |
3710 | ||
3711 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3712 | ||
7fe9b298 GP |
3713 | del_timer(&pi->ack_timer); |
3714 | ||
1890d36b GP |
3715 | queue_work(_busy_wq, &pi->busy_work); |
3716 | ||
3717 | return err; | |
3718 | } | |
3719 | ||
18778a63 | 3720 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3721 | { |
3722 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3723 | struct sk_buff *_skb; | |
3724 | int err = -EINVAL; | |
3725 | ||
18778a63 GP |
3726 | /* |
3727 | * TODO: We have to notify the userland if some data is lost with the | |
3728 | * Streaming Mode. | |
3729 | */ | |
3730 | ||
c74e560c GP |
3731 | switch (control & L2CAP_CTRL_SAR) { |
3732 | case L2CAP_SDU_UNSEGMENTED: | |
3733 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3734 | kfree_skb(pi->sdu); | |
3735 | break; | |
3736 | } | |
3737 | ||
3738 | err = sock_queue_rcv_skb(sk, skb); | |
3739 | if (!err) | |
3740 | return 0; | |
3741 | ||
3742 | break; | |
3743 | ||
3744 | case L2CAP_SDU_START: | |
3745 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3746 | kfree_skb(pi->sdu); | |
3747 | break; | |
3748 | } | |
3749 | ||
3750 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3751 | skb_pull(skb, 2); | |
3752 | ||
052897ca GP |
3753 | if (pi->sdu_len > pi->imtu) { |
3754 | err = -EMSGSIZE; | |
3755 | break; | |
3756 | } | |
3757 | ||
c74e560c GP |
3758 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3759 | if (!pi->sdu) { | |
3760 | err = -ENOMEM; | |
3761 | break; | |
3762 | } | |
3763 | ||
3764 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3765 | ||
3766 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3767 | pi->partial_sdu_len = skb->len; | |
3768 | err = 0; | |
3769 | break; | |
3770 | ||
3771 | case L2CAP_SDU_CONTINUE: | |
3772 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3773 | break; | |
3774 | ||
3775 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3776 | ||
3777 | pi->partial_sdu_len += skb->len; | |
3778 | if (pi->partial_sdu_len > pi->sdu_len) | |
3779 | kfree_skb(pi->sdu); | |
3780 | else | |
3781 | err = 0; | |
3782 | ||
3783 | break; | |
3784 | ||
3785 | case L2CAP_SDU_END: | |
3786 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3787 | break; | |
3788 | ||
3789 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3790 | ||
3791 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3792 | pi->partial_sdu_len += skb->len; | |
3793 | ||
36f2fd58 GP |
3794 | if (pi->partial_sdu_len > pi->imtu) |
3795 | goto drop; | |
3796 | ||
c74e560c GP |
3797 | if (pi->partial_sdu_len == pi->sdu_len) { |
3798 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3799 | err = sock_queue_rcv_skb(sk, _skb); | |
3800 | if (err < 0) | |
3801 | kfree_skb(_skb); | |
3802 | } | |
c74e560c GP |
3803 | err = 0; |
3804 | ||
36f2fd58 GP |
3805 | drop: |
3806 | kfree_skb(pi->sdu); | |
c74e560c GP |
3807 | break; |
3808 | } | |
3809 | ||
3810 | kfree_skb(skb); | |
3811 | return err; | |
3812 | } | |
3813 | ||
8f17154f GP |
3814 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3815 | { | |
3816 | struct sk_buff *skb; | |
afefdbc4 | 3817 | u16 control; |
8f17154f | 3818 | |
59203a21 | 3819 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3820 | if (bt_cb(skb)->tx_seq != tx_seq) |
3821 | break; | |
3822 | ||
3823 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3824 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3825 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3826 | l2cap_pi(sk)->buffer_seq_srej = |
3827 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3828 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3829 | } |
3830 | } | |
3831 | ||
3832 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3833 | { | |
3834 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3835 | struct srej_list *l, *tmp; | |
3836 | u16 control; | |
3837 | ||
59203a21 | 3838 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3839 | if (l->tx_seq == tx_seq) { |
3840 | list_del(&l->list); | |
3841 | kfree(l); | |
3842 | return; | |
3843 | } | |
3844 | control = L2CAP_SUPER_SELECT_REJECT; | |
3845 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3846 | l2cap_send_sframe(pi, control); | |
3847 | list_del(&l->list); | |
3848 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3849 | } | |
3850 | } | |
3851 | ||
3852 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3853 | { | |
3854 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3855 | struct srej_list *new; | |
3856 | u16 control; | |
3857 | ||
3858 | while (tx_seq != pi->expected_tx_seq) { | |
3859 | control = L2CAP_SUPER_SELECT_REJECT; | |
3860 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3861 | l2cap_send_sframe(pi, control); | |
3862 | ||
3863 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3864 | new->tx_seq = pi->expected_tx_seq; |
3865 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3866 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3867 | } | |
8ff50ec0 | 3868 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3869 | } |
3870 | ||
1c2acffb GP |
3871 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3872 | { | |
3873 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3874 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3875 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3876 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3877 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3878 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3879 | int err = 0; |
3880 | ||
0e98958d GP |
3881 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3882 | rx_control); | |
1c2acffb | 3883 | |
9b16dc65 GP |
3884 | if (L2CAP_CTRL_FINAL & rx_control && |
3885 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3886 | del_timer(&pi->monitor_timer); |
3887 | if (pi->unacked_frames > 0) | |
3888 | __mod_retrans_timer(); | |
3889 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3890 | } | |
3891 | ||
9f121a5a GP |
3892 | pi->expected_ack_seq = req_seq; |
3893 | l2cap_drop_acked_frames(sk); | |
3894 | ||
8f17154f GP |
3895 | if (tx_seq == pi->expected_tx_seq) |
3896 | goto expected; | |
1c2acffb | 3897 | |
9b53350d JPRV |
3898 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3899 | if (tx_seq_offset < 0) | |
3900 | tx_seq_offset += 64; | |
3901 | ||
3902 | /* invalid tx_seq */ | |
3903 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3904 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3905 | goto drop; |
3906 | } | |
3907 | ||
1890d36b GP |
3908 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3909 | goto drop; | |
3910 | ||
8f17154f GP |
3911 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3912 | struct srej_list *first; | |
30afb5b2 | 3913 | |
8f17154f GP |
3914 | first = list_first_entry(SREJ_LIST(sk), |
3915 | struct srej_list, list); | |
3916 | if (tx_seq == first->tx_seq) { | |
3917 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3918 | l2cap_check_srej_gap(sk, tx_seq); | |
3919 | ||
3920 | list_del(&first->list); | |
3921 | kfree(first); | |
3922 | ||
3923 | if (list_empty(SREJ_LIST(sk))) { | |
3924 | pi->buffer_seq = pi->buffer_seq_srej; | |
3925 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3926 | l2cap_send_ack(pi); |
0e98958d | 3927 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3928 | } |
3929 | } else { | |
3930 | struct srej_list *l; | |
9b53350d JPRV |
3931 | |
3932 | /* duplicated tx_seq */ | |
3933 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3934 | goto drop; | |
8f17154f GP |
3935 | |
3936 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3937 | if (l->tx_seq == tx_seq) { | |
3938 | l2cap_resend_srejframe(sk, tx_seq); | |
3939 | return 0; | |
3940 | } | |
3941 | } | |
3942 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3943 | } |
3944 | } else { | |
9b53350d JPRV |
3945 | expected_tx_seq_offset = |
3946 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3947 | if (expected_tx_seq_offset < 0) | |
3948 | expected_tx_seq_offset += 64; | |
3949 | ||
3950 | /* duplicated tx_seq */ | |
3951 | if (tx_seq_offset < expected_tx_seq_offset) | |
3952 | goto drop; | |
3953 | ||
8f17154f | 3954 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3955 | |
0e98958d GP |
3956 | BT_DBG("sk %p, Enter SREJ", sk); |
3957 | ||
8f17154f GP |
3958 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3959 | pi->buffer_seq_srej = pi->buffer_seq; | |
3960 | ||
3961 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3962 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3963 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3964 | ||
ef54fd93 GP |
3965 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3966 | ||
8f17154f | 3967 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3968 | |
3969 | del_timer(&pi->ack_timer); | |
1c2acffb | 3970 | } |
30afb5b2 GP |
3971 | return 0; |
3972 | ||
8f17154f GP |
3973 | expected: |
3974 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3975 | ||
3976 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3977 | bt_cb(skb)->tx_seq = tx_seq; |
3978 | bt_cb(skb)->sar = sar; | |
3979 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3980 | return 0; |
3981 | } | |
3982 | ||
2ece3684 GP |
3983 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3984 | if (err < 0) | |
3985 | return 0; | |
3986 | ||
4ec10d97 GP |
3987 | if (rx_control & L2CAP_CTRL_FINAL) { |
3988 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3989 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3990 | else |
3991 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3992 | } |
3993 | ||
c1b4f43b GP |
3994 | __mod_ack_timer(); |
3995 | ||
803020c6 GP |
3996 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3997 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3998 | l2cap_send_ack(pi); |
3999 | ||
8f17154f | 4000 | return 0; |
9b53350d JPRV |
4001 | |
4002 | drop: | |
4003 | kfree_skb(skb); | |
4004 | return 0; | |
1c2acffb GP |
4005 | } |
4006 | ||
e072745f | 4007 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
4008 | { |
4009 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 4010 | |
0e98958d GP |
4011 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
4012 | rx_control); | |
4013 | ||
6e3a5981 GP |
4014 | pi->expected_ack_seq = __get_reqseq(rx_control); |
4015 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 4016 | |
e072745f | 4017 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 4018 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
4019 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
4020 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
4021 | (pi->unacked_frames > 0)) | |
4022 | __mod_retrans_timer(); | |
4023 | ||
4024 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4025 | l2cap_send_srejtail(sk); | |
4026 | } else { | |
4027 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 4028 | } |
1d8f5d16 | 4029 | |
e072745f GP |
4030 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4031 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 4032 | |
e072745f GP |
4033 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
4034 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4035 | else |
4036 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 4037 | |
e072745f | 4038 | } else { |
e072745f GP |
4039 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
4040 | (pi->unacked_frames > 0)) | |
4041 | __mod_retrans_timer(); | |
1c2acffb | 4042 | |
2246b2f1 | 4043 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
dfc909be | 4044 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
e072745f | 4045 | l2cap_send_ack(pi); |
dfc909be | 4046 | } else { |
e072745f | 4047 | l2cap_ertm_send(sk); |
dfc909be | 4048 | } |
e072745f GP |
4049 | } |
4050 | } | |
2246b2f1 | 4051 | |
e072745f GP |
4052 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
4053 | { | |
4054 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4055 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4056 | |
0e98958d GP |
4057 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4058 | ||
e072745f GP |
4059 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4060 | ||
8abb52ee | 4061 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
4062 | l2cap_drop_acked_frames(sk); |
4063 | ||
4064 | if (rx_control & L2CAP_CTRL_FINAL) { | |
4065 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
4066 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
4067 | else |
4068 | l2cap_retransmit_frames(sk); | |
e072745f | 4069 | } else { |
dfc909be | 4070 | l2cap_retransmit_frames(sk); |
30afb5b2 | 4071 | |
0301ef04 | 4072 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 4073 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
4074 | } |
4075 | } | |
4076 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
4077 | { | |
4078 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4079 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 4080 | |
0e98958d GP |
4081 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4082 | ||
e072745f | 4083 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 4084 | |
e072745f GP |
4085 | if (rx_control & L2CAP_CTRL_POLL) { |
4086 | pi->expected_ack_seq = tx_seq; | |
4087 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
4088 | |
4089 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
4090 | l2cap_retransmit_one_frame(sk, tx_seq); |
4091 | ||
e072745f | 4092 | l2cap_ertm_send(sk); |
dfc909be | 4093 | |
e072745f GP |
4094 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4095 | pi->srej_save_reqseq = tx_seq; | |
4096 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4097 | } |
e072745f GP |
4098 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4099 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
4100 | pi->srej_save_reqseq == tx_seq) | |
4101 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
4102 | else | |
dfc909be | 4103 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 4104 | } else { |
dfc909be | 4105 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
4106 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4107 | pi->srej_save_reqseq = tx_seq; | |
4108 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4109 | } |
e072745f GP |
4110 | } |
4111 | } | |
4112 | ||
4113 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
4114 | { | |
4115 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4116 | u8 tx_seq = __get_reqseq(rx_control); | |
4117 | ||
0e98958d GP |
4118 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
4119 | ||
e072745f GP |
4120 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
4121 | pi->expected_ack_seq = tx_seq; | |
4122 | l2cap_drop_acked_frames(sk); | |
4123 | ||
3cb123d1 GP |
4124 | if (rx_control & L2CAP_CTRL_POLL) |
4125 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
4126 | ||
99b0d4b7 GP |
4127 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
4128 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
4129 | if (rx_control & L2CAP_CTRL_POLL) |
4130 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 4131 | return; |
e072745f | 4132 | } |
99b0d4b7 GP |
4133 | |
4134 | if (rx_control & L2CAP_CTRL_POLL) | |
4135 | l2cap_send_srejtail(sk); | |
4136 | else | |
4137 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
4138 | } |
4139 | ||
4140 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
4141 | { | |
4142 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
4143 | ||
9b16dc65 GP |
4144 | if (L2CAP_CTRL_FINAL & rx_control && |
4145 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
4146 | del_timer(&l2cap_pi(sk)->monitor_timer); |
4147 | if (l2cap_pi(sk)->unacked_frames > 0) | |
4148 | __mod_retrans_timer(); | |
4149 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4150 | } | |
4151 | ||
4152 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
4153 | case L2CAP_SUPER_RCV_READY: | |
4154 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
4155 | break; |
4156 | ||
e072745f GP |
4157 | case L2CAP_SUPER_REJECT: |
4158 | l2cap_data_channel_rejframe(sk, rx_control); | |
4159 | break; | |
2246b2f1 | 4160 | |
e072745f GP |
4161 | case L2CAP_SUPER_SELECT_REJECT: |
4162 | l2cap_data_channel_srejframe(sk, rx_control); | |
4163 | break; | |
4164 | ||
4165 | case L2CAP_SUPER_RCV_NOT_READY: | |
4166 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
4167 | break; |
4168 | } | |
4169 | ||
faaebd19 | 4170 | kfree_skb(skb); |
1c2acffb GP |
4171 | return 0; |
4172 | } | |
4173 | ||
1da177e4 LT |
4174 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4175 | { | |
4176 | struct sock *sk; | |
6840ed07 | 4177 | struct l2cap_pinfo *pi; |
51893f88 | 4178 | u16 control; |
f6337c77 | 4179 | u8 tx_seq, req_seq; |
51893f88 | 4180 | int len, next_tx_seq_offset, req_seq_offset; |
1da177e4 LT |
4181 | |
4182 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
4183 | if (!sk) { | |
4184 | BT_DBG("unknown cid 0x%4.4x", cid); | |
4185 | goto drop; | |
4186 | } | |
4187 | ||
6840ed07 GP |
4188 | pi = l2cap_pi(sk); |
4189 | ||
1da177e4 LT |
4190 | BT_DBG("sk %p, len %d", sk, skb->len); |
4191 | ||
4192 | if (sk->sk_state != BT_CONNECTED) | |
4193 | goto drop; | |
4194 | ||
6840ed07 | 4195 | switch (pi->mode) { |
1c2acffb GP |
4196 | case L2CAP_MODE_BASIC: |
4197 | /* If socket recv buffers overflows we drop data here | |
4198 | * which is *bad* because L2CAP has to be reliable. | |
4199 | * But we don't have any other choice. L2CAP doesn't | |
4200 | * provide flow control mechanism. */ | |
1da177e4 | 4201 | |
6840ed07 | 4202 | if (pi->imtu < skb->len) |
1c2acffb | 4203 | goto drop; |
1da177e4 | 4204 | |
1c2acffb GP |
4205 | if (!sock_queue_rcv_skb(sk, skb)) |
4206 | goto done; | |
4207 | break; | |
4208 | ||
4209 | case L2CAP_MODE_ERTM: | |
4210 | control = get_unaligned_le16(skb->data); | |
4211 | skb_pull(skb, 2); | |
c74e560c | 4212 | len = skb->len; |
1c2acffb | 4213 | |
26000089 GP |
4214 | /* |
4215 | * We can just drop the corrupted I-frame here. | |
4216 | * Receiver will miss it and start proper recovery | |
4217 | * procedures and ask retransmission. | |
4218 | */ | |
4219 | if (l2cap_check_fcs(pi, skb)) | |
4220 | goto drop; | |
4221 | ||
bc1b1f8b | 4222 | if (__is_sar_start(control) && __is_iframe(control)) |
c74e560c GP |
4223 | len -= 2; |
4224 | ||
fcc203c3 GP |
4225 | if (pi->fcs == L2CAP_FCS_CRC16) |
4226 | len -= 2; | |
4227 | ||
18778a63 | 4228 | if (len > pi->mps) { |
9b108fc0 | 4229 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
1c2acffb | 4230 | goto drop; |
18778a63 | 4231 | } |
1c2acffb | 4232 | |
01760bdd JPRV |
4233 | req_seq = __get_reqseq(control); |
4234 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
4235 | if (req_seq_offset < 0) | |
4236 | req_seq_offset += 64; | |
4237 | ||
4238 | next_tx_seq_offset = | |
4239 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
4240 | if (next_tx_seq_offset < 0) | |
4241 | next_tx_seq_offset += 64; | |
4242 | ||
4243 | /* check for invalid req-seq */ | |
4244 | if (req_seq_offset > next_tx_seq_offset) { | |
9b108fc0 | 4245 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
01760bdd JPRV |
4246 | goto drop; |
4247 | } | |
4248 | ||
277ffbe3 | 4249 | if (__is_iframe(control)) { |
51893f88 | 4250 | if (len < 0) { |
9b108fc0 | 4251 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
277ffbe3 | 4252 | goto drop; |
18778a63 | 4253 | } |
277ffbe3 | 4254 | |
fcafde2e | 4255 | l2cap_data_channel_iframe(sk, control, skb); |
277ffbe3 | 4256 | } else { |
18778a63 | 4257 | if (len != 0) { |
9b108fc0 | 4258 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
277ffbe3 | 4259 | goto drop; |
18778a63 | 4260 | } |
277ffbe3 | 4261 | |
fcafde2e | 4262 | l2cap_data_channel_sframe(sk, control, skb); |
277ffbe3 | 4263 | } |
1c2acffb | 4264 | |
fcafde2e | 4265 | goto done; |
1c2acffb | 4266 | |
6840ed07 GP |
4267 | case L2CAP_MODE_STREAMING: |
4268 | control = get_unaligned_le16(skb->data); | |
4269 | skb_pull(skb, 2); | |
4270 | len = skb->len; | |
4271 | ||
26000089 GP |
4272 | if (l2cap_check_fcs(pi, skb)) |
4273 | goto drop; | |
4274 | ||
6840ed07 GP |
4275 | if (__is_sar_start(control)) |
4276 | len -= 2; | |
4277 | ||
fcc203c3 GP |
4278 | if (pi->fcs == L2CAP_FCS_CRC16) |
4279 | len -= 2; | |
4280 | ||
51893f88 | 4281 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
4282 | goto drop; |
4283 | ||
4284 | tx_seq = __get_txseq(control); | |
4285 | ||
4286 | if (pi->expected_tx_seq == tx_seq) | |
4287 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4288 | else | |
7dffe421 | 4289 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 4290 | |
18778a63 | 4291 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
4292 | |
4293 | goto done; | |
4294 | ||
1c2acffb | 4295 | default: |
e8235c6b | 4296 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
4297 | break; |
4298 | } | |
1da177e4 LT |
4299 | |
4300 | drop: | |
4301 | kfree_skb(skb); | |
4302 | ||
4303 | done: | |
0139418c MH |
4304 | if (sk) |
4305 | bh_unlock_sock(sk); | |
4306 | ||
1da177e4 LT |
4307 | return 0; |
4308 | } | |
4309 | ||
8e036fc3 | 4310 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
4311 | { |
4312 | struct sock *sk; | |
4313 | ||
4314 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
4315 | if (!sk) | |
4316 | goto drop; | |
4317 | ||
4318 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4319 | ||
4320 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
4321 | goto drop; | |
4322 | ||
4323 | if (l2cap_pi(sk)->imtu < skb->len) | |
4324 | goto drop; | |
4325 | ||
4326 | if (!sock_queue_rcv_skb(sk, skb)) | |
4327 | goto done; | |
4328 | ||
4329 | drop: | |
4330 | kfree_skb(skb); | |
4331 | ||
4332 | done: | |
af05b30b GP |
4333 | if (sk) |
4334 | bh_unlock_sock(sk); | |
1da177e4 LT |
4335 | return 0; |
4336 | } | |
4337 | ||
4338 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
4339 | { | |
4340 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4341 | u16 cid, len; |
4342 | __le16 psm; | |
1da177e4 LT |
4343 | |
4344 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4345 | cid = __le16_to_cpu(lh->cid); | |
4346 | len = __le16_to_cpu(lh->len); | |
4347 | ||
1c2acffb GP |
4348 | if (len != skb->len) { |
4349 | kfree_skb(skb); | |
4350 | return; | |
4351 | } | |
4352 | ||
1da177e4 LT |
4353 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4354 | ||
4355 | switch (cid) { | |
8db4dc46 | 4356 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4357 | l2cap_sig_channel(conn, skb); |
4358 | break; | |
4359 | ||
8db4dc46 | 4360 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4361 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4362 | skb_pull(skb, 2); |
4363 | l2cap_conless_channel(conn, psm, skb); | |
4364 | break; | |
4365 | ||
4366 | default: | |
4367 | l2cap_data_channel(conn, cid, skb); | |
4368 | break; | |
4369 | } | |
4370 | } | |
4371 | ||
4372 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4373 | ||
4374 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4375 | { | |
4376 | int exact = 0, lm1 = 0, lm2 = 0; | |
4377 | register struct sock *sk; | |
4378 | struct hlist_node *node; | |
4379 | ||
4380 | if (type != ACL_LINK) | |
4381 | return 0; | |
4382 | ||
4383 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4384 | ||
4385 | /* Find listening sockets and check their link_mode */ | |
4386 | read_lock(&l2cap_sk_list.lock); | |
4387 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4388 | if (sk->sk_state != BT_LISTEN) | |
4389 | continue; | |
4390 | ||
4391 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
4392 | lm1 |= HCI_LM_ACCEPT; |
4393 | if (l2cap_pi(sk)->role_switch) | |
4394 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 4395 | exact++; |
2af6b9d5 MH |
4396 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4397 | lm2 |= HCI_LM_ACCEPT; | |
4398 | if (l2cap_pi(sk)->role_switch) | |
4399 | lm2 |= HCI_LM_MASTER; | |
4400 | } | |
1da177e4 LT |
4401 | } |
4402 | read_unlock(&l2cap_sk_list.lock); | |
4403 | ||
4404 | return exact ? lm1 : lm2; | |
4405 | } | |
4406 | ||
4407 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4408 | { | |
0139418c MH |
4409 | struct l2cap_conn *conn; |
4410 | ||
1da177e4 LT |
4411 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4412 | ||
4413 | if (hcon->type != ACL_LINK) | |
4414 | return 0; | |
4415 | ||
4416 | if (!status) { | |
1da177e4 LT |
4417 | conn = l2cap_conn_add(hcon, status); |
4418 | if (conn) | |
4419 | l2cap_conn_ready(conn); | |
0139418c | 4420 | } else |
1da177e4 LT |
4421 | l2cap_conn_del(hcon, bt_err(status)); |
4422 | ||
4423 | return 0; | |
4424 | } | |
4425 | ||
2950f21a MH |
4426 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4427 | { | |
4428 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4429 | ||
4430 | BT_DBG("hcon %p", hcon); | |
4431 | ||
4432 | if (hcon->type != ACL_LINK || !conn) | |
4433 | return 0x13; | |
4434 | ||
4435 | return conn->disc_reason; | |
4436 | } | |
4437 | ||
4438 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4439 | { |
4440 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4441 | ||
4442 | if (hcon->type != ACL_LINK) | |
4443 | return 0; | |
4444 | ||
4445 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4446 | |
1da177e4 LT |
4447 | return 0; |
4448 | } | |
4449 | ||
f62e4323 MH |
4450 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4451 | { | |
bd3c9e25 | 4452 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4453 | return; |
4454 | ||
f62e4323 MH |
4455 | if (encrypt == 0x00) { |
4456 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4457 | l2cap_sock_clear_timer(sk); | |
4458 | l2cap_sock_set_timer(sk, HZ * 5); | |
4459 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4460 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4461 | } else { | |
4462 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4463 | l2cap_sock_clear_timer(sk); | |
4464 | } | |
4465 | } | |
4466 | ||
8c1b2355 | 4467 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4468 | { |
4469 | struct l2cap_chan_list *l; | |
0139418c | 4470 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4471 | struct sock *sk; |
1da177e4 | 4472 | |
0139418c | 4473 | if (!conn) |
1da177e4 | 4474 | return 0; |
0139418c | 4475 | |
1da177e4 LT |
4476 | l = &conn->chan_list; |
4477 | ||
4478 | BT_DBG("conn %p", conn); | |
4479 | ||
4480 | read_lock(&l->lock); | |
4481 | ||
4482 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4483 | bh_lock_sock(sk); | |
4484 | ||
6a8d3010 MH |
4485 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4486 | bh_unlock_sock(sk); | |
4487 | continue; | |
4488 | } | |
4489 | ||
f62e4323 | 4490 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4491 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4492 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4493 | bh_unlock_sock(sk); |
4494 | continue; | |
4495 | } | |
4496 | ||
b1235d79 MH |
4497 | if (sk->sk_state == BT_CONNECT) { |
4498 | if (!status) { | |
4499 | struct l2cap_conn_req req; | |
4500 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4501 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4502 | |
b1235d79 | 4503 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 4504 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 4505 | |
b1235d79 MH |
4506 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4507 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4508 | } else { | |
4509 | l2cap_sock_clear_timer(sk); | |
4510 | l2cap_sock_set_timer(sk, HZ / 10); | |
4511 | } | |
4512 | } else if (sk->sk_state == BT_CONNECT2) { | |
4513 | struct l2cap_conn_rsp rsp; | |
4514 | __u16 result; | |
1da177e4 | 4515 | |
b1235d79 MH |
4516 | if (!status) { |
4517 | sk->sk_state = BT_CONFIG; | |
4518 | result = L2CAP_CR_SUCCESS; | |
4519 | } else { | |
4520 | sk->sk_state = BT_DISCONN; | |
4521 | l2cap_sock_set_timer(sk, HZ / 10); | |
4522 | result = L2CAP_CR_SEC_BLOCK; | |
4523 | } | |
4524 | ||
4525 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4526 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4527 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4528 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4529 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4530 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4531 | } | |
1da177e4 LT |
4532 | |
4533 | bh_unlock_sock(sk); | |
4534 | } | |
4535 | ||
4536 | read_unlock(&l->lock); | |
b1235d79 | 4537 | |
1da177e4 LT |
4538 | return 0; |
4539 | } | |
4540 | ||
4541 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4542 | { | |
4543 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4544 | ||
4545 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4546 | goto drop; | |
4547 | ||
4548 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4549 | ||
4550 | if (flags & ACL_START) { | |
4551 | struct l2cap_hdr *hdr; | |
4552 | int len; | |
4553 | ||
4554 | if (conn->rx_len) { | |
4555 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4556 | kfree_skb(conn->rx_skb); | |
4557 | conn->rx_skb = NULL; | |
4558 | conn->rx_len = 0; | |
4559 | l2cap_conn_unreliable(conn, ECOMM); | |
4560 | } | |
4561 | ||
4562 | if (skb->len < 2) { | |
4563 | BT_ERR("Frame is too short (len %d)", skb->len); | |
4564 | l2cap_conn_unreliable(conn, ECOMM); | |
4565 | goto drop; | |
4566 | } | |
4567 | ||
4568 | hdr = (struct l2cap_hdr *) skb->data; | |
4569 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4570 | ||
4571 | if (len == skb->len) { | |
4572 | /* Complete frame received */ | |
4573 | l2cap_recv_frame(conn, skb); | |
4574 | return 0; | |
4575 | } | |
4576 | ||
4577 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4578 | ||
4579 | if (skb->len > len) { | |
4580 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4581 | skb->len, len); | |
4582 | l2cap_conn_unreliable(conn, ECOMM); | |
4583 | goto drop; | |
4584 | } | |
4585 | ||
4586 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4587 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4588 | if (!conn->rx_skb) | |
1da177e4 LT |
4589 | goto drop; |
4590 | ||
d626f62b | 4591 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4592 | skb->len); |
1da177e4 LT |
4593 | conn->rx_len = len - skb->len; |
4594 | } else { | |
4595 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4596 | ||
4597 | if (!conn->rx_len) { | |
4598 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4599 | l2cap_conn_unreliable(conn, ECOMM); | |
4600 | goto drop; | |
4601 | } | |
4602 | ||
4603 | if (skb->len > conn->rx_len) { | |
4604 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4605 | skb->len, conn->rx_len); | |
4606 | kfree_skb(conn->rx_skb); | |
4607 | conn->rx_skb = NULL; | |
4608 | conn->rx_len = 0; | |
4609 | l2cap_conn_unreliable(conn, ECOMM); | |
4610 | goto drop; | |
4611 | } | |
4612 | ||
d626f62b | 4613 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4614 | skb->len); |
1da177e4 LT |
4615 | conn->rx_len -= skb->len; |
4616 | ||
4617 | if (!conn->rx_len) { | |
4618 | /* Complete frame received */ | |
4619 | l2cap_recv_frame(conn, conn->rx_skb); | |
4620 | conn->rx_skb = NULL; | |
4621 | } | |
4622 | } | |
4623 | ||
4624 | drop: | |
4625 | kfree_skb(skb); | |
4626 | return 0; | |
4627 | } | |
4628 | ||
aef7d97c | 4629 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4630 | { |
4631 | struct sock *sk; | |
4632 | struct hlist_node *node; | |
1da177e4 LT |
4633 | |
4634 | read_lock_bh(&l2cap_sk_list.lock); | |
4635 | ||
be9d1227 MH |
4636 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4637 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4638 | |
aef7d97c MH |
4639 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4640 | batostr(&bt_sk(sk)->src), | |
4641 | batostr(&bt_sk(sk)->dst), | |
4642 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4643 | pi->scid, pi->dcid, | |
4644 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4645 | } |
1da177e4 | 4646 | |
1da177e4 | 4647 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4648 | |
aef7d97c | 4649 | return 0; |
1da177e4 LT |
4650 | } |
4651 | ||
aef7d97c MH |
4652 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4653 | { | |
4654 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4655 | } | |
4656 | ||
4657 | static const struct file_operations l2cap_debugfs_fops = { | |
4658 | .open = l2cap_debugfs_open, | |
4659 | .read = seq_read, | |
4660 | .llseek = seq_lseek, | |
4661 | .release = single_release, | |
4662 | }; | |
4663 | ||
4664 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4665 | |
90ddc4f0 | 4666 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4667 | .family = PF_BLUETOOTH, |
4668 | .owner = THIS_MODULE, | |
4669 | .release = l2cap_sock_release, | |
4670 | .bind = l2cap_sock_bind, | |
4671 | .connect = l2cap_sock_connect, | |
4672 | .listen = l2cap_sock_listen, | |
4673 | .accept = l2cap_sock_accept, | |
4674 | .getname = l2cap_sock_getname, | |
4675 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4676 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4677 | .poll = bt_sock_poll, |
3241ad82 | 4678 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4679 | .mmap = sock_no_mmap, |
4680 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4681 | .shutdown = l2cap_sock_shutdown, |
4682 | .setsockopt = l2cap_sock_setsockopt, | |
4683 | .getsockopt = l2cap_sock_getsockopt | |
4684 | }; | |
4685 | ||
ec1b4cf7 | 4686 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4687 | .family = PF_BLUETOOTH, |
4688 | .owner = THIS_MODULE, | |
4689 | .create = l2cap_sock_create, | |
4690 | }; | |
4691 | ||
4692 | static struct hci_proto l2cap_hci_proto = { | |
4693 | .name = "L2CAP", | |
4694 | .id = HCI_PROTO_L2CAP, | |
4695 | .connect_ind = l2cap_connect_ind, | |
4696 | .connect_cfm = l2cap_connect_cfm, | |
4697 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4698 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4699 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4700 | .recv_acldata = l2cap_recv_acldata |
4701 | }; | |
4702 | ||
4703 | static int __init l2cap_init(void) | |
4704 | { | |
4705 | int err; | |
be9d1227 | 4706 | |
1da177e4 LT |
4707 | err = proto_register(&l2cap_proto, 0); |
4708 | if (err < 0) | |
4709 | return err; | |
4710 | ||
1890d36b GP |
4711 | _busy_wq = create_singlethread_workqueue("l2cap"); |
4712 | if (!_busy_wq) | |
4713 | goto error; | |
4714 | ||
1da177e4 LT |
4715 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); |
4716 | if (err < 0) { | |
4717 | BT_ERR("L2CAP socket registration failed"); | |
4718 | goto error; | |
4719 | } | |
4720 | ||
4721 | err = hci_register_proto(&l2cap_hci_proto); | |
4722 | if (err < 0) { | |
4723 | BT_ERR("L2CAP protocol registration failed"); | |
4724 | bt_sock_unregister(BTPROTO_L2CAP); | |
4725 | goto error; | |
4726 | } | |
4727 | ||
aef7d97c MH |
4728 | if (bt_debugfs) { |
4729 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4730 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4731 | if (!l2cap_debugfs) | |
4732 | BT_ERR("Failed to create L2CAP debug file"); | |
4733 | } | |
1da177e4 LT |
4734 | |
4735 | BT_INFO("L2CAP ver %s", VERSION); | |
4736 | BT_INFO("L2CAP socket layer initialized"); | |
4737 | ||
4738 | return 0; | |
4739 | ||
4740 | error: | |
4741 | proto_unregister(&l2cap_proto); | |
4742 | return err; | |
4743 | } | |
4744 | ||
4745 | static void __exit l2cap_exit(void) | |
4746 | { | |
aef7d97c | 4747 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4748 | |
1890d36b GP |
4749 | flush_workqueue(_busy_wq); |
4750 | destroy_workqueue(_busy_wq); | |
4751 | ||
1da177e4 LT |
4752 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) |
4753 | BT_ERR("L2CAP socket unregistration failed"); | |
4754 | ||
4755 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4756 | BT_ERR("L2CAP protocol unregistration failed"); | |
4757 | ||
4758 | proto_unregister(&l2cap_proto); | |
4759 | } | |
4760 | ||
4761 | void l2cap_load(void) | |
4762 | { | |
4763 | /* Dummy function to trigger automatic L2CAP module loading by | |
4764 | * other modules that use L2CAP sockets but don't use any other | |
4765 | * symbols from it. */ | |
1da177e4 LT |
4766 | } |
4767 | EXPORT_SYMBOL(l2cap_load); | |
4768 | ||
4769 | module_init(l2cap_init); | |
4770 | module_exit(l2cap_exit); | |
4771 | ||
44dd46de MH |
4772 | module_param(enable_ertm, bool, 0644); |
4773 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
4774 | ||
63fbd24e | 4775 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4776 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4777 | MODULE_VERSION(VERSION); | |
4778 | MODULE_LICENSE("GPL"); | |
4779 | MODULE_ALIAS("bt-proto-0"); |